]> git.ipfire.org Git - thirdparty/cups.git/blobdiff - cups/dest.c
License change: Apache License, Version 2.0.
[thirdparty/cups.git] / cups / dest.c
index 4fa54ddcd3e47f0a32854b47c1b8c4d6017e864d..f7b435662c21c47db3941107d9ec941f0a2b262d 100644 (file)
@@ -4,13 +4,7 @@
  * Copyright 2007-2017 by Apple Inc.
  * Copyright 1997-2007 by Easy Software Products.
  *
- * These coded instructions, statements, and computer programs are the
- * property of Apple Inc. and are protected by Federal copyright
- * law.  Distribution and use rights are outlined in the file "LICENSE.txt"
- * which should have been included with this file.  If this file is
- * missing or damaged, see the license at "http://www.cups.org/".
- *
- * This file is subject to the Apple OS-Developed Software exception.
+ * Licensed under Apache License v2.0.  See the file "LICENSE" for more information.
  */
 
 /*
 #endif /* __APPLE__ */
 
 #if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
+#  define _CUPS_DNSSD_GET_DESTS 250     /* Milliseconds for cupsGetDests */
 #  define _CUPS_DNSSD_MAXTIME  50      /* Milliseconds for maximum quantum of time */
+#else
+#  define _CUPS_DNSSD_GET_DESTS 0       /* Milliseconds for cupsGetDests */
 #endif /* HAVE_DNSSD || HAVE_AVAHI */
 
 
@@ -227,6 +224,7 @@ static void         cups_dnssd_unquote(char *dst, const char *src,
                                           size_t dstsize);
 static int             cups_elapsed(struct timeval *t);
 #endif /* HAVE_DNSSD || HAVE_AVAHI */
+static int              cups_enum_dests(http_t *http, unsigned flags, int msec, int *cancel, cups_ptype_t type, cups_ptype_t mask, cups_dest_cb_t cb, void *user_data);
 static int             cups_find_dest(const char *name, const char *instance,
                                       int num_dests, cups_dest_t *dests, int prev,
                                       int *rdiff);
@@ -975,2054 +973,2026 @@ cupsEnumDests(
   cups_dest_cb_t cb,                   /* I - Callback function */
   void           *user_data)           /* I - User data */
 {
-  int                  i,              /* Looping var */
-                       num_dests;      /* Number of destinations */
-  cups_dest_t          *dests = NULL,  /* Destinations */
-                       *dest;          /* Current destination */
-  const char           *defprinter;    /* Default printer */
-  char                 name[1024],     /* Copy of printer name */
-                       *instance,      /* Pointer to instance name */
-                       *user_default;  /* User default printer */
-#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
-  int                  count,          /* Number of queries started */
-                       completed,      /* Number of completed queries */
-                       remaining;      /* Remainder of timeout */
-  struct timeval       curtime;        /* Current time */
-  _cups_dnssd_data_t   data;           /* Data for callback */
-  _cups_dnssd_device_t *device;        /* Current device */
-#  ifdef HAVE_DNSSD
-  int                  nfds,           /* Number of files responded */
-                       main_fd;        /* File descriptor for lookups */
-  DNSServiceRef                ipp_ref = NULL, /* IPP browser */
-                       local_ipp_ref = NULL; /* Local IPP browser */
-#    ifdef HAVE_SSL
-  DNSServiceRef                ipps_ref = NULL,/* IPPS browser */
-                       local_ipps_ref = NULL; /* Local IPPS browser */
-#    endif /* HAVE_SSL */
-#    ifdef HAVE_POLL
-  struct pollfd                pfd;            /* Polling data */
-#    else
-  fd_set               input;          /* Input set for select() */
-  struct timeval       timeout;        /* Timeout for select() */
-#    endif /* HAVE_POLL */
-#  else /* HAVE_AVAHI */
-  int                  error;          /* Error value */
-  AvahiServiceBrowser  *ipp_ref = NULL;/* IPP browser */
-#    ifdef HAVE_SSL
-  AvahiServiceBrowser  *ipps_ref = NULL; /* IPPS browser */
-#    endif /* HAVE_SSL */
-#  endif /* HAVE_DNSSD */
-#endif /* HAVE_DNSSD || HAVE_AVAHI */
+  return (cups_enum_dests(CUPS_HTTP_DEFAULT, flags, msec, cancel, type, mask, cb, user_data));
+}
 
 
-  DEBUG_printf(("cupsEnumDests(flags=%x, msec=%d, cancel=%p, type=%x, mask=%x, cb=%p, user_data=%p)", flags, msec, (void *)cancel, type, mask, (void *)cb, (void *)user_data));
+#  ifdef __BLOCKS__
+/*
+ * 'cupsEnumDestsBlock()' - Enumerate available destinations with a block.
+ *
+ * Destinations are enumerated from one or more sources.  The block receives the
+ * @code user_data@ pointer and the destination pointer which can be used as
+ * input to the @link cupsCopyDest@ function.  The block must return 1 to
+ * continue enumeration or 0 to stop.
+ *
+ * The @code type@ and @code mask@ arguments allow the caller to filter the
+ * destinations that are enumerated.  Passing 0 for both will enumerate all
+ * printers.  The constant @code CUPS_PRINTER_DISCOVERED@ is used to filter on
+ * destinations that are available but have not yet been added locally.
+ *
+ * Enumeration happens on the current thread and does not return until all
+ * destinations have been enumerated or the block returns 0.
+ *
+ * Note: The block will likely receive multiple updates for the same
+ * destinations - it is up to the caller to suppress any duplicate destinations.
+ *
+ * @since CUPS 1.6/macOS 10.8@ @exclude all@
+ */
 
- /*
-  * Range check input...
-  */
+int                                    /* O - 1 on success, 0 on failure */
+cupsEnumDestsBlock(
+    unsigned          flags,           /* I - Enumeration flags */
+    int               timeout,         /* I - Timeout in milliseconds, 0 for indefinite */
+    int               *cancel,         /* I - Pointer to "cancel" variable */
+    cups_ptype_t      type,            /* I - Printer type bits */
+    cups_ptype_t      mask,            /* I - Mask for printer type bits */
+    cups_dest_block_t block)           /* I - Block */
+{
+  return (cupsEnumDests(flags, timeout, cancel, type, mask,
+                        (cups_dest_cb_t)cups_block_cb, (void *)block));
+}
+#  endif /* __BLOCKS__ */
 
-  (void)flags;
 
-  if (!cb)
-  {
-    DEBUG_puts("1cupsEnumDests: No callback, returning 0.");
-    return (0);
-  }
+/*
+ * 'cupsFreeDests()' - Free the memory used by the list of destinations.
+ */
 
- /*
-  * Get ready to enumerate...
-  */
+void
+cupsFreeDests(int         num_dests,   /* I - Number of destinations */
+              cups_dest_t *dests)      /* I - Destinations */
+{
+  int          i;                      /* Looping var */
+  cups_dest_t  *dest;                  /* Current destination */
 
-#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
-  memset(&data, 0, sizeof(data));
 
-  data.type      = type;
-  data.mask      = mask;
-  data.cb        = cb;
-  data.user_data = user_data;
-  data.devices   = cupsArrayNew3((cups_array_func_t)cups_dnssd_compare_devices, NULL, NULL, 0, NULL, (cups_afree_func_t)cups_dnssd_free_device);
-#endif /* HAVE_DNSSD || HAVE_AVAHI */
+  if (num_dests == 0 || dests == NULL)
+    return;
 
-  if (!(mask & CUPS_PRINTER_DISCOVERED) || !(type & CUPS_PRINTER_DISCOVERED))
+  for (i = num_dests, dest = dests; i > 0; i --, dest ++)
   {
-   /*
-    * Get the list of local printers and pass them to the callback function...
-    */
+    _cupsStrFree(dest->name);
+    _cupsStrFree(dest->instance);
 
-    num_dests = _cupsGetDests(CUPS_HTTP_DEFAULT, IPP_OP_CUPS_GET_PRINTERS, NULL,
-                              &dests, type, mask);
+    cupsFreeOptions(dest->num_options, dest->options);
+  }
 
-    if ((user_default = _cupsUserDefault(name, sizeof(name))) != NULL)
-      defprinter = name;
-    else if ((defprinter = cupsGetDefault2(CUPS_HTTP_DEFAULT)) != NULL)
-    {
-      strlcpy(name, defprinter, sizeof(name));
-      defprinter = name;
-    }
+  free(dests);
+}
 
-    if (defprinter)
-    {
-     /*
-      * Separate printer and instance name...
-      */
 
-      if ((instance = strchr(name, '/')) != NULL)
-        *instance++ = '\0';
+/*
+ * 'cupsGetDest()' - Get the named destination from the list.
+ *
+ * Use the @link cupsEnumDests@ or @link cupsGetDests2@ functions to get a
+ * list of supported destinations for the current user.
+ */
 
-     /*
-      * Lookup the printer and instance and make it the default...
-      */
+cups_dest_t *                          /* O - Destination pointer or @code NULL@ */
+cupsGetDest(const char  *name,         /* I - Destination name or @code NULL@ for the default destination */
+            const char *instance,      /* I - Instance name or @code NULL@ */
+            int         num_dests,     /* I - Number of destinations */
+            cups_dest_t *dests)                /* I - Destinations */
+{
+  int  diff,                           /* Result of comparison */
+       match;                          /* Matching index */
 
-      if ((dest = cupsGetDest(name, instance, num_dests, dests)) != NULL)
-        dest->is_default = 1;
-    }
 
-    for (i = num_dests, dest = dests;
-         i > 0 && (!cancel || !*cancel);
-         i --, dest ++)
+  if (num_dests <= 0 || !dests)
+    return (NULL);
+
+  if (!name)
+  {
+   /*
+    * NULL name for default printer.
+    */
+
+    while (num_dests > 0)
     {
-#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
-      const char *device_uri;          /* Device URI */
-#endif /* HAVE_DNSSD || HAVE_AVAHI */
+      if (dests->is_default)
+        return (dests);
 
-      if (!(*cb)(user_data, i > 1 ? CUPS_DEST_FLAGS_MORE : CUPS_DEST_FLAGS_NONE,
-                 dest))
-        break;
+      num_dests --;
+      dests ++;
+    }
+  }
+  else
+  {
+   /*
+    * Lookup name and optionally the instance...
+    */
 
-#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
-      if (!dest->instance && (device_uri = cupsGetOption("device-uri", dest->num_options, dest->options)) != NULL && !strncmp(device_uri, "dnssd://", 8))
-      {
-       /*
-        * Add existing queue using service name, etc. so we don't list it again...
-        */
+    match = cups_find_dest(name, instance, num_dests, dests, -1, &diff);
 
-        char   scheme[32],             /* URI scheme */
-                userpass[32],           /* Username:password */
-                serviceName[256],       /* Service name (host field) */
-                resource[256],          /* Resource (options) */
-                *regtype,               /* Registration type */
-                *replyDomain;           /* Registration domain */
-        int    port;                   /* Port number (not used) */
+    if (!diff)
+      return (dests + match);
+  }
 
-        if (httpSeparateURI(HTTP_URI_CODING_ALL, device_uri, scheme, sizeof(scheme), userpass, sizeof(userpass), serviceName, sizeof(serviceName), &port, resource, sizeof(resource)) >= HTTP_URI_STATUS_OK)
-        {
-          if ((regtype = strstr(serviceName, "._ipp")) != NULL)
-          {
-            *regtype++ = '\0';
+  return (NULL);
+}
 
-            if ((replyDomain = strstr(regtype, "._tcp.")) != NULL)
-            {
-              replyDomain[5] = '\0';
-              replyDomain += 6;
 
-              if ((device = cups_dnssd_get_device(&data, serviceName, regtype, replyDomain)) != NULL)
-                device->state = _CUPS_DNSSD_ACTIVE;
-            }
-          }
-        }
-      }
-#endif /* HAVE_DNSSD || HAVE_AVAHI */
-    }
+/*
+ * '_cupsGetDestResource()' - Get the resource path and URI for a destination.
+ */
 
-    cupsFreeDests(num_dests, dests);
+const char *                           /* O - Printer URI */
+_cupsGetDestResource(
+    cups_dest_t *dest,                 /* I - Destination */
+    char        *resource,             /* I - Resource buffer */
+    size_t      resourcesize)          /* I - Size of resource buffer */
+{
+  const char   *uri;                   /* Printer URI */
+  char         scheme[32],             /* URI scheme */
+               userpass[256],          /* Username and password (unused) */
+               hostname[256];          /* Hostname */
+  int          port;                   /* Port number */
 
-    if (i > 0 || msec == 0)
-      goto enum_finished;
-  }
+
+  DEBUG_printf(("_cupsGetDestResource(dest=%p(%s), resource=%p, resourcesize=%d)", (void *)dest, dest->name, (void *)resource, (int)resourcesize));
 
  /*
-  * Return early if the caller doesn't want to do discovery...
+  * Range check input...
   */
 
-  if ((mask & CUPS_PRINTER_DISCOVERED) && !(type & CUPS_PRINTER_DISCOVERED))
-    goto enum_finished;
+  if (!dest || !resource || resourcesize < 1)
+  {
+    if (resource)
+      *resource = '\0';
+
+    _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(EINVAL), 0);
+    return (NULL);
+  }
 
-#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
  /*
-  * Get Bonjour-shared printers...
+  * Grab the printer URI...
   */
 
-  gettimeofday(&curtime, NULL);
-
-#  ifdef HAVE_DNSSD
-  if (DNSServiceCreateConnection(&data.main_ref) != kDNSServiceErr_NoError)
+  if ((uri = cupsGetOption("printer-uri-supported", dest->num_options, dest->options)) == NULL)
   {
-    DEBUG_puts("1cupsEnumDests: Unable to create service browser, returning 0.");
-    return (0);
-  }
+    if ((uri = cupsGetOption("device-uri", dest->num_options, dest->options)) != NULL)
+    {
+#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
+      if (strstr(uri, "._tcp"))
+        uri = cups_dnssd_resolve(dest, uri, 5000, NULL, NULL, NULL);
+#endif /* HAVE_DNSSD || HAVE_AVAHI */
+    }
 
-  main_fd = DNSServiceRefSockFD(data.main_ref);
+    if (uri)
+    {
+      DEBUG_printf(("1_cupsGetDestResource: Resolved printer-uri-supported=\"%s\"", uri));
 
-  ipp_ref = data.main_ref;
-  DNSServiceBrowse(&ipp_ref, kDNSServiceFlagsShareConnection, 0,
-                   "_ipp._tcp", NULL,
-                   (DNSServiceBrowseReply)cups_dnssd_browse_cb, &data);
+      uri = _cupsCreateDest(dest->name, cupsGetOption("printer-info", dest->num_options, dest->options), NULL, uri, resource, resourcesize);
+    }
 
-  local_ipp_ref = data.main_ref;
-  DNSServiceBrowse(&local_ipp_ref, kDNSServiceFlagsShareConnection,
-                   kDNSServiceInterfaceIndexLocalOnly,
-                   "_ipp._tcp", NULL,
-                   (DNSServiceBrowseReply)cups_dnssd_local_cb, &data);
+    if (uri)
+    {
+      DEBUG_printf(("1_cupsGetDestResource: Local printer-uri-supported=\"%s\"", uri));
 
-#    ifdef HAVE_SSL
-  ipps_ref = data.main_ref;
-  DNSServiceBrowse(&ipps_ref, kDNSServiceFlagsShareConnection, 0,
-                   "_ipps._tcp", NULL,
-                   (DNSServiceBrowseReply)cups_dnssd_browse_cb, &data);
+      dest->num_options = cupsAddOption("printer-uri-supported", uri, dest->num_options, &dest->options);
 
-  local_ipps_ref = data.main_ref;
-  DNSServiceBrowse(&local_ipps_ref, kDNSServiceFlagsShareConnection,
-                   kDNSServiceInterfaceIndexLocalOnly,
-                   "_ipps._tcp", NULL,
-                   (DNSServiceBrowseReply)cups_dnssd_local_cb, &data);
-#    endif /* HAVE_SSL */
+      uri = cupsGetOption("printer-uri-supported", dest->num_options, dest->options);
+    }
+    else
+    {
+      DEBUG_puts("1_cupsGetDestResource: No printer-uri-supported found.");
 
-#  else /* HAVE_AVAHI */
-  if ((data.simple_poll = avahi_simple_poll_new()) == NULL)
-  {
-    DEBUG_puts("1cupsEnumDests: Unable to create Avahi poll, returning 0.");
-    return (0);
-  }
+      if (resource)
+        *resource = '\0';
 
-  avahi_simple_poll_set_func(data.simple_poll, cups_dnssd_poll_cb, &data);
+      _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(ENOENT), 0);
 
-  data.client = avahi_client_new(avahi_simple_poll_get(data.simple_poll),
-                                0, cups_dnssd_client_cb, &data,
-                                &error);
-  if (!data.client)
-  {
-    DEBUG_puts("1cupsEnumDests: Unable to create Avahi client, returning 0.");
-    avahi_simple_poll_free(data.simple_poll);
-    return (0);
+      return (NULL);
+    }
   }
+  else
+  {
+    DEBUG_printf(("1_cupsGetDestResource: printer-uri-supported=\"%s\"", uri));
 
-  data.browsers = 1;
-  ipp_ref = avahi_service_browser_new(data.client, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, "_ipp._tcp", NULL, 0, cups_dnssd_browse_cb, &data);
+    if (httpSeparateURI(HTTP_URI_CODING_ALL, uri, scheme, sizeof(scheme),
+                        userpass, sizeof(userpass), hostname, sizeof(hostname),
+                        &port, resource, (int)resourcesize) < HTTP_URI_STATUS_OK)
+    {
+      _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("Bad printer-uri."), 1);
 
-#    ifdef HAVE_SSL
-  data.browsers ++;
-  ipps_ref = avahi_service_browser_new(data.client, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, "_ipps._tcp", NULL, 0, cups_dnssd_browse_cb, &data);
-#    endif /* HAVE_SSL */
-#  endif /* HAVE_DNSSD */
+      return (NULL);
+    }
+  }
 
-  if (msec < 0)
-    remaining = INT_MAX;
-  else
-    remaining = msec;
+  DEBUG_printf(("1_cupsGetDestResource: resource=\"%s\"", resource));
 
-  while (remaining > 0 && (!cancel || !*cancel))
-  {
-   /*
-    * Check for input...
-    */
+  return (uri);
+}
 
-    DEBUG_printf(("1cupsEnumDests: remaining=%d", remaining));
 
-    cups_elapsed(&curtime);
+/*
+ * 'cupsGetDestWithURI()' - Get a destination associated with a URI.
+ *
+ * "name" is the desired name for the printer. If @code NULL@, a name will be
+ * created using the URI.
+ *
+ * "uri" is the "ipp" or "ipps" URI for the printer.
+ *
+ * @since CUPS 2.0/macOS 10.10@
+ */
 
-#  ifdef HAVE_DNSSD
-#    ifdef HAVE_POLL
-    pfd.fd     = main_fd;
-    pfd.events = POLLIN;
+cups_dest_t *                          /* O - Destination or @code NULL@ */
+cupsGetDestWithURI(const char *name,   /* I - Desired printer name or @code NULL@ */
+                   const char *uri)    /* I - URI for the printer */
+{
+  cups_dest_t  *dest;                  /* New destination */
+  char         temp[1024],             /* Temporary string */
+               scheme[256],            /* Scheme from URI */
+               userpass[256],          /* Username:password from URI */
+               hostname[256],          /* Hostname from URI */
+               resource[1024],         /* Resource path from URI */
+               *ptr;                   /* Pointer into string */
+  const char   *info;                  /* printer-info string */
+  int          port;                   /* Port number from URI */
 
-    nfds = poll(&pfd, 1, remaining > _CUPS_DNSSD_MAXTIME ? _CUPS_DNSSD_MAXTIME : remaining);
 
-#    else
-    FD_ZERO(&input);
-    FD_SET(main_fd, &input);
+ /*
+  * Range check input...
+  */
 
-    timeout.tv_sec  = 0;
-    timeout.tv_usec = 1000 * (remaining > _CUPS_DNSSD_MAXTIME ? _CUPS_DNSSD_MAXTIME : remaining);
+  if (!uri)
+  {
+    _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(EINVAL), 0);
+    return (NULL);
+  }
 
-    nfds = select(main_fd + 1, &input, NULL, NULL, &timeout);
-#    endif /* HAVE_POLL */
+  if (httpSeparateURI(HTTP_URI_CODING_ALL, uri, scheme, sizeof(scheme), userpass, sizeof(userpass), hostname, sizeof(hostname), &port, resource, sizeof(resource)) < HTTP_URI_STATUS_OK ||
+      (strncmp(uri, "ipp://", 6) && strncmp(uri, "ipps://", 7)))
+  {
+    _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("Bad printer-uri."), 1);
 
-    if (nfds > 0)
-      DNSServiceProcessResult(data.main_ref);
+    return (NULL);
+  }
 
-#  else /* HAVE_AVAHI */
-    data.got_data = 0;
+  if (name)
+  {
+    info = name;
+  }
+  else
+  {
+   /*
+    * Create the name from the URI...
+    */
 
-    if ((error = avahi_simple_poll_iterate(data.simple_poll, _CUPS_DNSSD_MAXTIME)) > 0)
+    if (strstr(hostname, "._tcp"))
     {
      /*
-      * We've been told to exit the loop.  Perhaps the connection to
-      * Avahi failed.
+      * Use the service instance name...
       */
 
-      break;
-    }
-
-    DEBUG_printf(("1cupsEnumDests: got_data=%d", data.got_data));
-#  endif /* HAVE_DNSSD */
-
-    remaining -= cups_elapsed(&curtime);
+      if ((ptr = strstr(hostname, "._")) != NULL)
+        *ptr = '\0';
 
-    for (device = (_cups_dnssd_device_t *)cupsArrayFirst(data.devices),
-             count = 0, completed = 0;
-         device;
-         device = (_cups_dnssd_device_t *)cupsArrayNext(data.devices))
+      cups_queue_name(temp, hostname, sizeof(temp));
+      name = temp;
+      info = hostname;
+    }
+    else if (!strncmp(resource, "/classes/", 9))
     {
-      if (device->ref)
-        count ++;
-
-      if (device->state == _CUPS_DNSSD_ACTIVE)
-        completed ++;
-
-      if (!device->ref && device->state == _CUPS_DNSSD_NEW)
-      {
-       DEBUG_printf(("1cupsEnumDests: Querying '%s'.", device->fullName));
-
-#  ifdef HAVE_DNSSD
-        device->ref = data.main_ref;
-
-       if (DNSServiceQueryRecord(&(device->ref),
-                                 kDNSServiceFlagsShareConnection,
-                                 0, device->fullName,
-                                 kDNSServiceType_TXT,
-                                 kDNSServiceClass_IN,
-                                 (DNSServiceQueryRecordReply)cups_dnssd_query_cb,
-                                 &data) == kDNSServiceErr_NoError)
-       {
-         count ++;
-       }
-       else
-       {
-         device->ref   = 0;
-         device->state = _CUPS_DNSSD_ERROR;
-
-         DEBUG_puts("1cupsEnumDests: Query failed.");
-       }
-
-#  else /* HAVE_AVAHI */
-       if ((device->ref = avahi_record_browser_new(data.client, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, device->fullName, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_TXT, 0, cups_dnssd_query_cb, &data)) != NULL)
-        {
-          DEBUG_printf(("1cupsEnumDests: Query ref=%p", device->ref));
-         count ++;
-       }
-       else
-       {
-         device->state = _CUPS_DNSSD_ERROR;
-
-         DEBUG_printf(("1cupsEnumDests: Query failed: %s", avahi_strerror(avahi_client_errno(data.client))));
-       }
-#  endif /* HAVE_DNSSD */
-      }
-      else if (device->ref && device->state == _CUPS_DNSSD_PENDING)
-      {
-        completed ++;
-
-        DEBUG_printf(("1cupsEnumDests: Query for \"%s\" is complete.", device->fullName));
-
-        if ((device->type & mask) == type)
-        {
-         DEBUG_printf(("1cupsEnumDests: Add callback for \"%s\".", device->dest.name));
-         if (!(*cb)(user_data, CUPS_DEST_FLAGS_NONE, &device->dest))
-         {
-           remaining = -1;
-           break;
-         }
-        }
-
-        device->state = _CUPS_DNSSD_ACTIVE;
-      }
+      snprintf(temp, sizeof(temp), "%s @ %s", resource + 9, hostname);
+      name = resource + 9;
+      info = temp;
+    }
+    else if (!strncmp(resource, "/printers/", 10))
+    {
+      snprintf(temp, sizeof(temp), "%s @ %s", resource + 10, hostname);
+      name = resource + 10;
+      info = temp;
+    }
+    else
+    {
+      name = hostname;
+      info = hostname;
     }
-
-#  ifdef HAVE_AVAHI
-    DEBUG_printf(("1cupsEnumDests: remaining=%d, browsers=%d, completed=%d, count=%d, devices count=%d", remaining, data.browsers, completed, count, cupsArrayCount(data.devices)));
-
-    if (data.browsers == 0 && completed == cupsArrayCount(data.devices))
-      break;
-#  else
-    DEBUG_printf(("1cupsEnumDests: remaining=%d, completed=%d, count=%d, devices count=%d", remaining, completed, count, cupsArrayCount(data.devices)));
-
-    if (completed == cupsArrayCount(data.devices))
-      break;
-#  endif /* HAVE_AVAHI */
   }
-#endif /* HAVE_DNSSD || HAVE_AVAHI */
 
  /*
-  * Return...
+  * Create the destination...
   */
 
-  enum_finished:
-
-#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
-  cupsArrayDelete(data.devices);
-
-#  ifdef HAVE_DNSSD
-  if (ipp_ref)
-    DNSServiceRefDeallocate(ipp_ref);
-  if (local_ipp_ref)
-    DNSServiceRefDeallocate(local_ipp_ref);
-
-#    ifdef HAVE_SSL
-  if (ipps_ref)
-    DNSServiceRefDeallocate(ipps_ref);
-  if (local_ipps_ref)
-    DNSServiceRefDeallocate(local_ipps_ref);
-#    endif /* HAVE_SSL */
-
-  if (data.main_ref)
-    DNSServiceRefDeallocate(data.main_ref);
-
-#  else /* HAVE_AVAHI */
-  if (ipp_ref)
-    avahi_service_browser_free(ipp_ref);
-#    ifdef HAVE_SSL
-  if (ipps_ref)
-    avahi_service_browser_free(ipps_ref);
-#    endif /* HAVE_SSL */
-
-  if (data.client)
-    avahi_client_free(data.client);
-  if (data.simple_poll)
-    avahi_simple_poll_free(data.simple_poll);
-#  endif /* HAVE_DNSSD */
-#endif /* HAVE_DNSSD || HAVE_AVAHI */
+  if ((dest = calloc(1, sizeof(cups_dest_t))) == NULL)
+  {
+    _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(errno), 0);
+    return (NULL);
+  }
 
-  DEBUG_puts("1cupsEnumDests: Returning 1.");
+  dest->name        = _cupsStrAlloc(name);
+  dest->num_options = cupsAddOption("device-uri", uri, dest->num_options, &(dest->options));
+  dest->num_options = cupsAddOption("printer-info", info, dest->num_options, &(dest->options));
 
-  return (1);
+  return (dest);
 }
 
 
-#  ifdef __BLOCKS__
 /*
- * 'cupsEnumDestsBlock()' - Enumerate available destinations with a block.
+ * '_cupsGetDests()' - Get destinations from a server.
  *
- * Destinations are enumerated from one or more sources.  The block receives the
- * @code user_data@ pointer and the destination pointer which can be used as
- * input to the @link cupsCopyDest@ function.  The block must return 1 to
- * continue enumeration or 0 to stop.
+ * "op" is IPP_OP_CUPS_GET_PRINTERS to get a full list, IPP_OP_CUPS_GET_DEFAULT
+ * to get the system-wide default printer, or IPP_OP_GET_PRINTER_ATTRIBUTES for
+ * a known printer.
  *
- * The @code type@ and @code mask@ arguments allow the caller to filter the
- * destinations that are enumerated.  Passing 0 for both will enumerate all
- * printers.  The constant @code CUPS_PRINTER_DISCOVERED@ is used to filter on
- * destinations that are available but have not yet been added locally.
+ * "name" is the name of an existing printer and is only used when "op" is
+ * IPP_OP_GET_PRINTER_ATTRIBUTES.
  *
- * Enumeration happens on the current thread and does not return until all
- * destinations have been enumerated or the block returns 0.
+ * "dest" is initialized to point to the array of destinations.
  *
- * Note: The block will likely receive multiple updates for the same
- * destinations - it is up to the caller to suppress any duplicate destinations.
+ * 0 is returned if there are no printers, no default printer, or the named
+ * printer does not exist, respectively.
  *
- * @since CUPS 1.6/macOS 10.8@ @exclude all@
+ * Free the memory used by the destination array using the @link cupsFreeDests@
+ * function.
+ *
+ * Note: On macOS this function also gets the default paper from the system
+ * preferences (~/L/P/org.cups.PrintingPrefs.plist) and includes it in the
+ * options array for each destination that supports it.
  */
 
-int                                    /* O - 1 on success, 0 on failure */
-cupsEnumDestsBlock(
-    unsigned          flags,           /* I - Enumeration flags */
-    int               timeout,         /* I - Timeout in milliseconds, 0 for indefinite */
-    int               *cancel,         /* I - Pointer to "cancel" variable */
-    cups_ptype_t      type,            /* I - Printer type bits */
-    cups_ptype_t      mask,            /* I - Mask for printer type bits */
-    cups_dest_block_t block)           /* I - Block */
+int                                    /* O  - Number of destinations */
+_cupsGetDests(http_t       *http,      /* I  - Connection to server or
+                                        *      @code CUPS_HTTP_DEFAULT@ */
+             ipp_op_t     op,          /* I  - IPP operation */
+             const char   *name,       /* I  - Name of destination */
+             cups_dest_t  **dests,     /* IO - Destinations */
+             cups_ptype_t type,        /* I  - Printer type bits */
+             cups_ptype_t mask)        /* I  - Printer type mask */
 {
-  return (cupsEnumDests(flags, timeout, cancel, type, mask,
-                        (cups_dest_cb_t)cups_block_cb, (void *)block));
-}
-#  endif /* __BLOCKS__ */
+  int          num_dests = 0;          /* Number of destinations */
+  cups_dest_t  *dest;                  /* Current destination */
+  ipp_t                *request,               /* IPP Request */
+               *response;              /* IPP Response */
+  ipp_attribute_t *attr;               /* Current attribute */
+  const char   *printer_name;          /* printer-name attribute */
+  char         uri[1024];              /* printer-uri value */
+  int          num_options;            /* Number of options */
+  cups_option_t        *options;               /* Options */
+#ifdef __APPLE__
+  char         media_default[41];      /* Default paper size */
+#endif /* __APPLE__ */
+  char         optname[1024],          /* Option name */
+               value[2048],            /* Option value */
+               *ptr;                   /* Pointer into name/value */
+  static const char * const pattrs[] = /* Attributes we're interested in */
+               {
+                 "auth-info-required",
+                 "device-uri",
+                 "job-sheets-default",
+                 "marker-change-time",
+                 "marker-colors",
+                 "marker-high-levels",
+                 "marker-levels",
+                 "marker-low-levels",
+                 "marker-message",
+                 "marker-names",
+                 "marker-types",
+#ifdef __APPLE__
+                 "media-supported",
+#endif /* __APPLE__ */
+                 "printer-commands",
+                 "printer-defaults",
+                 "printer-info",
+                 "printer-is-accepting-jobs",
+                 "printer-is-shared",
+                  "printer-is-temporary",
+                 "printer-location",
+                 "printer-make-and-model",
+                 "printer-mandatory-job-attributes",
+                 "printer-name",
+                 "printer-state",
+                 "printer-state-change-time",
+                 "printer-state-reasons",
+                 "printer-type",
+                 "printer-uri-supported"
+               };
 
 
-/*
- * 'cupsFreeDests()' - Free the memory used by the list of destinations.
- */
+  DEBUG_printf(("_cupsGetDests(http=%p, op=%x(%s), name=\"%s\", dests=%p, type=%x, mask=%x)", (void *)http, op, ippOpString(op), name, (void *)dests, type, mask));
 
-void
-cupsFreeDests(int         num_dests,   /* I - Number of destinations */
-              cups_dest_t *dests)      /* I - Destinations */
-{
-  int          i;                      /* Looping var */
-  cups_dest_t  *dest;                  /* Current destination */
+#ifdef __APPLE__
+ /*
+  * Get the default paper size...
+  */
 
+  appleGetPaperSize(media_default, sizeof(media_default));
+  DEBUG_printf(("1_cupsGetDests: Default media is '%s'.", media_default));
+#endif /* __APPLE__ */
 
-  if (num_dests == 0 || dests == NULL)
-    return;
+ /*
+  * Build a IPP_OP_CUPS_GET_PRINTERS or IPP_OP_GET_PRINTER_ATTRIBUTES request, which
+  * require the following attributes:
+  *
+  *    attributes-charset
+  *    attributes-natural-language
+  *    requesting-user-name
+  *    printer-uri [for IPP_OP_GET_PRINTER_ATTRIBUTES]
+  */
 
-  for (i = num_dests, dest = dests; i > 0; i --, dest ++)
-  {
-    _cupsStrFree(dest->name);
-    _cupsStrFree(dest->instance);
+  request = ippNewRequest(op);
 
-    cupsFreeOptions(dest->num_options, dest->options);
-  }
+  ippAddStrings(request, IPP_TAG_OPERATION, IPP_TAG_KEYWORD,
+                "requested-attributes", sizeof(pattrs) / sizeof(pattrs[0]),
+               NULL, pattrs);
 
-  free(dests);
-}
+  ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_NAME,
+               "requesting-user-name", NULL, cupsUser());
 
+  if (name && op != IPP_OP_CUPS_GET_DEFAULT)
+  {
+    httpAssembleURIf(HTTP_URI_CODING_ALL, uri, sizeof(uri), "ipp", NULL,
+                     "localhost", ippPort(), "/printers/%s", name);
+    ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_URI, "printer-uri", NULL,
+                 uri);
+  }
+  else if (mask)
+  {
+    ippAddInteger(request, IPP_TAG_OPERATION, IPP_TAG_ENUM, "printer-type", (int)type);
+    ippAddInteger(request, IPP_TAG_OPERATION, IPP_TAG_ENUM, "printer-type-mask", (int)mask);
+  }
 
-/*
- * 'cupsGetDest()' - Get the named destination from the list.
- *
- * Use the @link cupsEnumDests@ or @link cupsGetDests2@ functions to get a
- * list of supported destinations for the current user.
- */
+ /*
+  * Do the request and get back a response...
+  */
 
-cups_dest_t *                          /* O - Destination pointer or @code NULL@ */
-cupsGetDest(const char  *name,         /* I - Destination name or @code NULL@ for the default destination */
-            const char *instance,      /* I - Instance name or @code NULL@ */
-            int         num_dests,     /* I - Number of destinations */
-            cups_dest_t *dests)                /* I - Destinations */
-{
-  int  diff,                           /* Result of comparison */
-       match;                          /* Matching index */
+  if ((response = cupsDoRequest(http, request, "/")) != NULL)
+  {
+    for (attr = response->attrs; attr != NULL; attr = attr->next)
+    {
+     /*
+      * Skip leading attributes until we hit a printer...
+      */
 
+      while (attr != NULL && attr->group_tag != IPP_TAG_PRINTER)
+        attr = attr->next;
 
-  if (num_dests <= 0 || !dests)
-    return (NULL);
+      if (attr == NULL)
+        break;
 
-  if (!name)
-  {
-   /*
-    * NULL name for default printer.
-    */
+     /*
+      * Pull the needed attributes from this printer...
+      */
 
-    while (num_dests > 0)
-    {
-      if (dests->is_default)
-        return (dests);
+      printer_name = NULL;
+      num_options  = 0;
+      options      = NULL;
 
-      num_dests --;
-      dests ++;
-    }
-  }
-  else
-  {
-   /*
-    * Lookup name and optionally the instance...
-    */
+      for (; attr && attr->group_tag == IPP_TAG_PRINTER; attr = attr->next)
+      {
+       if (attr->value_tag != IPP_TAG_INTEGER &&
+           attr->value_tag != IPP_TAG_ENUM &&
+           attr->value_tag != IPP_TAG_BOOLEAN &&
+           attr->value_tag != IPP_TAG_TEXT &&
+           attr->value_tag != IPP_TAG_TEXTLANG &&
+           attr->value_tag != IPP_TAG_NAME &&
+           attr->value_tag != IPP_TAG_NAMELANG &&
+           attr->value_tag != IPP_TAG_KEYWORD &&
+           attr->value_tag != IPP_TAG_RANGE &&
+           attr->value_tag != IPP_TAG_URI)
+          continue;
 
-    match = cups_find_dest(name, instance, num_dests, dests, -1, &diff);
+        if (!strcmp(attr->name, "auth-info-required") ||
+           !strcmp(attr->name, "device-uri") ||
+           !strcmp(attr->name, "marker-change-time") ||
+           !strcmp(attr->name, "marker-colors") ||
+           !strcmp(attr->name, "marker-high-levels") ||
+           !strcmp(attr->name, "marker-levels") ||
+           !strcmp(attr->name, "marker-low-levels") ||
+           !strcmp(attr->name, "marker-message") ||
+           !strcmp(attr->name, "marker-names") ||
+           !strcmp(attr->name, "marker-types") ||
+           !strcmp(attr->name, "printer-commands") ||
+           !strcmp(attr->name, "printer-info") ||
+            !strcmp(attr->name, "printer-is-shared") ||
+            !strcmp(attr->name, "printer-is-temporary") ||
+           !strcmp(attr->name, "printer-make-and-model") ||
+           !strcmp(attr->name, "printer-mandatory-job-attributes") ||
+           !strcmp(attr->name, "printer-state") ||
+           !strcmp(attr->name, "printer-state-change-time") ||
+           !strcmp(attr->name, "printer-type") ||
+            !strcmp(attr->name, "printer-is-accepting-jobs") ||
+            !strcmp(attr->name, "printer-location") ||
+            !strcmp(attr->name, "printer-state-reasons") ||
+           !strcmp(attr->name, "printer-uri-supported"))
+        {
+        /*
+         * Add a printer description attribute...
+         */
 
-    if (!diff)
-      return (dests + match);
-  }
+          num_options = cupsAddOption(attr->name,
+                                     cups_make_string(attr, value,
+                                                      sizeof(value)),
+                                     num_options, &options);
+       }
+#ifdef __APPLE__
+       else if (!strcmp(attr->name, "media-supported") && media_default[0])
+       {
+        /*
+         * See if we can set a default media size...
+         */
 
-  return (NULL);
-}
+          int  i;                      /* Looping var */
 
+         for (i = 0; i < attr->num_values; i ++)
+           if (!_cups_strcasecmp(media_default, attr->values[i].string.text))
+           {
+              DEBUG_printf(("1_cupsGetDests: Setting media to '%s'.", media_default));
+             num_options = cupsAddOption("media", media_default, num_options, &options);
+              break;
+           }
+       }
+#endif /* __APPLE__ */
+        else if (!strcmp(attr->name, "printer-name") &&
+                attr->value_tag == IPP_TAG_NAME)
+         printer_name = attr->values[0].string.text;
+        else if (strncmp(attr->name, "notify-", 7) &&
+                 strncmp(attr->name, "print-quality-", 14) &&
+                 (attr->value_tag == IPP_TAG_BOOLEAN ||
+                 attr->value_tag == IPP_TAG_ENUM ||
+                 attr->value_tag == IPP_TAG_INTEGER ||
+                 attr->value_tag == IPP_TAG_KEYWORD ||
+                 attr->value_tag == IPP_TAG_NAME ||
+                 attr->value_tag == IPP_TAG_RANGE) &&
+                (ptr = strstr(attr->name, "-default")) != NULL)
+       {
+        /*
+         * Add a default option...
+         */
 
-/*
- * '_cupsGetDestResource()' - Get the resource path and URI for a destination.
- */
+          strlcpy(optname, attr->name, sizeof(optname));
+         optname[ptr - attr->name] = '\0';
 
-const char *                           /* O - Printer URI */
-_cupsGetDestResource(
-    cups_dest_t *dest,                 /* I - Destination */
-    char        *resource,             /* I - Resource buffer */
-    size_t      resourcesize)          /* I - Size of resource buffer */
-{
-  const char   *uri;                   /* Printer URI */
-  char         scheme[32],             /* URI scheme */
-               userpass[256],          /* Username and password (unused) */
-               hostname[256];          /* Hostname */
-  int          port;                   /* Port number */
+         if (_cups_strcasecmp(optname, "media") || !cupsGetOption("media", num_options, options))
+           num_options = cupsAddOption(optname, cups_make_string(attr, value, sizeof(value)), num_options, &options);
+       }
+      }
 
+     /*
+      * See if we have everything needed...
+      */
 
-  DEBUG_printf(("_cupsGetDestResource(dest=%p(%s), resource=%p, resourcesize=%d)", (void *)dest, dest->name, (void *)resource, (int)resourcesize));
+      if (!printer_name)
+      {
+        cupsFreeOptions(num_options, options);
 
- /*
-  * Range check input...
-  */
+        if (attr == NULL)
+         break;
+       else
+          continue;
+      }
 
-  if (!dest || !resource || resourcesize < 1)
-  {
-    if (resource)
-      *resource = '\0';
+      if ((dest = cups_add_dest(printer_name, NULL, &num_dests, dests)) != NULL)
+      {
+        dest->num_options = num_options;
+       dest->options     = options;
+      }
+      else
+        cupsFreeOptions(num_options, options);
 
-    _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(EINVAL), 0);
-    return (NULL);
+      if (attr == NULL)
+       break;
+    }
+
+    ippDelete(response);
   }
 
  /*
-  * Grab the printer URI...
+  * Return the count...
   */
 
-  if ((uri = cupsGetOption("printer-uri-supported", dest->num_options, dest->options)) == NULL)
-  {
-    if ((uri = cupsGetOption("device-uri", dest->num_options, dest->options)) != NULL)
-    {
-#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
-      if (strstr(uri, "._tcp"))
-        uri = cups_dnssd_resolve(dest, uri, 5000, NULL, NULL, NULL);
-#endif /* HAVE_DNSSD || HAVE_AVAHI */
-    }
+  return (num_dests);
+}
 
-    if (uri)
-    {
-      DEBUG_printf(("1_cupsGetDestResource: Resolved printer-uri-supported=\"%s\"", uri));
 
-      uri = _cupsCreateDest(dest->name, cupsGetOption("printer-info", dest->num_options, dest->options), NULL, uri, resource, resourcesize);
-    }
+/*
+ * 'cupsGetDests()' - Get the list of destinations from the default server.
+ *
+ * Starting with CUPS 1.2, the returned list of destinations include the
+ * "printer-info", "printer-is-accepting-jobs", "printer-is-shared",
+ * "printer-make-and-model", "printer-state", "printer-state-change-time",
+ * "printer-state-reasons", "printer-type", and "printer-uri-supported"
+ * attributes as options.
+ *
+ * CUPS 1.4 adds the "marker-change-time", "marker-colors",
+ * "marker-high-levels", "marker-levels", "marker-low-levels", "marker-message",
+ * "marker-names", "marker-types", and "printer-commands" attributes as options.
+ *
+ * CUPS 2.2 adds accessible IPP printers to the list of destinations that can
+ * be used.  The "printer-uri-supported" option will be present for those IPP
+ * printers that have been recently used.
+ *
+ * Use the @link cupsFreeDests@ function to free the destination list and
+ * the @link cupsGetDest@ function to find a particular destination.
+ *
+ * @exclude all@
+ */
 
-    if (uri)
-    {
-      DEBUG_printf(("1_cupsGetDestResource: Local printer-uri-supported=\"%s\"", uri));
+int                                    /* O - Number of destinations */
+cupsGetDests(cups_dest_t **dests)      /* O - Destinations */
+{
+  return (cupsGetDests2(CUPS_HTTP_DEFAULT, dests));
+}
 
-      dest->num_options = cupsAddOption("printer-uri-supported", uri, dest->num_options, &dest->options);
 
-      uri = cupsGetOption("printer-uri-supported", dest->num_options, dest->options);
-    }
-    else
-    {
-      DEBUG_puts("1_cupsGetDestResource: No printer-uri-supported found.");
+/*
+ * 'cupsGetDests2()' - Get the list of destinations from the specified server.
+ *
+ * Starting with CUPS 1.2, the returned list of destinations include the
+ * "printer-info", "printer-is-accepting-jobs", "printer-is-shared",
+ * "printer-make-and-model", "printer-state", "printer-state-change-time",
+ * "printer-state-reasons", "printer-type", and "printer-uri-supported"
+ * attributes as options.
+ *
+ * CUPS 1.4 adds the "marker-change-time", "marker-colors",
+ * "marker-high-levels", "marker-levels", "marker-low-levels", "marker-message",
+ * "marker-names", "marker-types", and "printer-commands" attributes as options.
+ *
+ * CUPS 2.2 adds accessible IPP printers to the list of destinations that can
+ * be used.  The "printer-uri-supported" option will be present for those IPP
+ * printers that have been recently used.
+ *
+ * Use the @link cupsFreeDests@ function to free the destination list and
+ * the @link cupsGetDest@ function to find a particular destination.
+ *
+ * @since CUPS 1.1.21/macOS 10.4@
+ */
+
+int                                    /* O - Number of destinations */
+cupsGetDests2(http_t      *http,       /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
+              cups_dest_t **dests)     /* O - Destinations */
+{
+  _cups_getdata_t data;                 /* Enumeration data */
+  cups_dest_t   *dest;                  /* Current destination */
+  const char   *home;                  /* HOME environment variable */
+  char         filename[1024];         /* Local ~/.cups/lpoptions file */
+  const char   *defprinter;            /* Default printer */
+  char         name[1024],             /* Copy of printer name */
+               *instance,              /* Pointer to instance name */
+               *user_default;          /* User default printer */
+  int          num_reals;              /* Number of real queues */
+  cups_dest_t  *reals;                 /* Real queues */
+  _cups_globals_t *cg = _cupsGlobals();        /* Pointer to library globals */
 
-      if (resource)
-        *resource = '\0';
 
-      _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(ENOENT), 0);
+  DEBUG_printf(("cupsGetDests2(http=%p, dests=%p)", (void *)http, (void *)dests));
 
-      return (NULL);
-    }
-  }
-  else
+/*
+  * Range check the input...
+  */
+
+  if (!dests)
   {
-    DEBUG_printf(("1_cupsGetDestResource: printer-uri-supported=\"%s\"", uri));
+    _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("Bad NULL dests pointer"), 1);
+    DEBUG_puts("1cupsGetDests2: NULL dests pointer, returning 0.");
+    return (0);
+  }
 
-    if (httpSeparateURI(HTTP_URI_CODING_ALL, uri, scheme, sizeof(scheme),
-                        userpass, sizeof(userpass), hostname, sizeof(hostname),
-                        &port, resource, (int)resourcesize) < HTTP_URI_STATUS_OK)
+ /*
+  * Connect to the server as needed...
+  */
+
+  if (!http)
+  {
+    if ((http = _cupsConnect()) == NULL)
     {
-      _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("Bad printer-uri."), 1);
+      *dests = NULL;
 
-      return (NULL);
+      return (0);
     }
   }
 
-  DEBUG_printf(("1_cupsGetDestResource: resource=\"%s\"", resource));
-
-  return (uri);
-}
+ /*
+  * Grab the printers and classes...
+  */
 
+  data.num_dests = 0;
+  data.dests     = NULL;
 
-/*
- * 'cupsGetDestWithURI()' - Get a destination associated with a URI.
- *
- * "name" is the desired name for the printer. If @code NULL@, a name will be
- * created using the URI.
- *
- * "uri" is the "ipp" or "ipps" URI for the printer.
- *
- * @since CUPS 2.0/macOS 10.10@
- */
+  if (!httpAddrLocalhost(httpGetAddress(http)))
+  {
+   /*
+    * When talking to a remote cupsd, just enumerate printers on the remote
+    * cupsd.
+    */
 
-cups_dest_t *                          /* O - Destination or @code NULL@ */
-cupsGetDestWithURI(const char *name,   /* I - Desired printer name or @code NULL@ */
-                   const char *uri)    /* I - URI for the printer */
-{
-  cups_dest_t  *dest;                  /* New destination */
-  char         temp[1024],             /* Temporary string */
-               scheme[256],            /* Scheme from URI */
-               userpass[256],          /* Username:password from URI */
-               hostname[256],          /* Hostname from URI */
-               resource[1024],         /* Resource path from URI */
-               *ptr;                   /* Pointer into string */
-  const char   *info;                  /* printer-info string */
-  int          port;                   /* Port number from URI */
+    cups_enum_dests(http, 0, _CUPS_DNSSD_GET_DESTS, NULL, 0, CUPS_PRINTER_DISCOVERED, (cups_dest_cb_t)cups_get_cb, &data);
+  }
+  else
+  {
+   /*
+    * When talking to a local cupsd, enumerate both local printers and ones we
+    * can find on the network...
+    */
 
+    cups_enum_dests(http, 0, _CUPS_DNSSD_GET_DESTS, NULL, 0, 0, (cups_dest_cb_t)cups_get_cb, &data);
+  }
 
  /*
-  * Range check input...
+  * Make a copy of the "real" queues for a later sanity check...
   */
 
-  if (!uri)
+  if (data.num_dests > 0)
   {
-    _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(EINVAL), 0);
-    return (NULL);
-  }
+    num_reals = data.num_dests;
+    reals     = calloc((size_t)num_reals, sizeof(cups_dest_t));
 
-  if (httpSeparateURI(HTTP_URI_CODING_ALL, uri, scheme, sizeof(scheme), userpass, sizeof(userpass), hostname, sizeof(hostname), &port, resource, sizeof(resource)) < HTTP_URI_STATUS_OK ||
-      (strncmp(uri, "ipp://", 6) && strncmp(uri, "ipps://", 7)))
+    if (reals)
+      memcpy(reals, data.dests, (size_t)num_reals * sizeof(cups_dest_t));
+    else
+      num_reals = 0;
+  }
+  else
   {
-    _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("Bad printer-uri."), 1);
-
-    return (NULL);
+    num_reals = 0;
+    reals     = NULL;
   }
 
-  if (name)
+ /*
+  * Grab the default destination...
+  */
+
+  if ((user_default = _cupsUserDefault(name, sizeof(name))) != NULL)
+    defprinter = name;
+  else if ((defprinter = cupsGetDefault2(http)) != NULL)
   {
-    info = name;
+    strlcpy(name, defprinter, sizeof(name));
+    defprinter = name;
   }
-  else
+
+  if (defprinter)
   {
    /*
-    * Create the name from the URI...
+    * Separate printer and instance name...
     */
 
-    if (strstr(hostname, "._tcp"))
-    {
-     /*
-      * Use the service instance name...
-      */
+    if ((instance = strchr(name, '/')) != NULL)
+      *instance++ = '\0';
 
-      if ((ptr = strstr(hostname, "._")) != NULL)
-        *ptr = '\0';
+   /*
+    * Lookup the printer and instance and make it the default...
+    */
 
-      cups_queue_name(temp, hostname, sizeof(temp));
-      name = temp;
-      info = hostname;
-    }
-    else if (!strncmp(resource, "/classes/", 9))
-    {
-      snprintf(temp, sizeof(temp), "%s @ %s", resource + 9, hostname);
-      name = resource + 9;
-      info = temp;
-    }
-    else if (!strncmp(resource, "/printers/", 10))
-    {
-      snprintf(temp, sizeof(temp), "%s @ %s", resource + 10, hostname);
-      name = resource + 10;
-      info = temp;
-    }
-    else
-    {
-      name = hostname;
-      info = hostname;
-    }
+    if ((dest = cupsGetDest(name, instance, data.num_dests, data.dests)) != NULL)
+      dest->is_default = 1;
   }
+  else
+    instance = NULL;
 
  /*
-  * Create the destination...
+  * Load the /etc/cups/lpoptions and ~/.cups/lpoptions files...
   */
 
-  if ((dest = calloc(1, sizeof(cups_dest_t))) == NULL)
+  snprintf(filename, sizeof(filename), "%s/lpoptions", cg->cups_serverroot);
+  data.num_dests = cups_get_dests(filename, NULL, NULL, user_default != NULL, data.num_dests, &data.dests);
+
+  if ((home = getenv("HOME")) != NULL)
   {
-    _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(errno), 0);
-    return (NULL);
-  }
+    snprintf(filename, sizeof(filename), "%s/.cups/lpoptions", home);
 
-  dest->name        = _cupsStrAlloc(name);
-  dest->num_options = cupsAddOption("device-uri", uri, dest->num_options, &(dest->options));
-  dest->num_options = cupsAddOption("printer-info", info, dest->num_options, &(dest->options));
+    data.num_dests = cups_get_dests(filename, NULL, NULL, user_default != NULL, data.num_dests, &data.dests);
+  }
 
-  return (dest);
-}
+ /*
+  * Validate the current default destination - this prevents old
+  * Default lines in /etc/cups/lpoptions and ~/.cups/lpoptions from
+  * pointing to a non-existent printer or class...
+  */
 
+  if (num_reals)
+  {
+   /*
+    * See if we have a default printer...
+    */
 
-/*
- * '_cupsGetDests()' - Get destinations from a server.
- *
- * "op" is IPP_OP_CUPS_GET_PRINTERS to get a full list, IPP_OP_CUPS_GET_DEFAULT
- * to get the system-wide default printer, or IPP_OP_GET_PRINTER_ATTRIBUTES for
- * a known printer.
- *
- * "name" is the name of an existing printer and is only used when "op" is
- * IPP_OP_GET_PRINTER_ATTRIBUTES.
- *
- * "dest" is initialized to point to the array of destinations.
- *
- * 0 is returned if there are no printers, no default printer, or the named
- * printer does not exist, respectively.
- *
- * Free the memory used by the destination array using the @link cupsFreeDests@
- * function.
- *
- * Note: On macOS this function also gets the default paper from the system
- * preferences (~/L/P/org.cups.PrintingPrefs.plist) and includes it in the
- * options array for each destination that supports it.
- */
+    if ((dest = cupsGetDest(NULL, NULL, data.num_dests, data.dests)) != NULL)
+    {
+     /*
+      * Have a default; see if it is real...
+      */
 
-int                                    /* O  - Number of destinations */
-_cupsGetDests(http_t       *http,      /* I  - Connection to server or
-                                        *      @code CUPS_HTTP_DEFAULT@ */
-             ipp_op_t     op,          /* I  - IPP operation */
-             const char   *name,       /* I  - Name of destination */
-             cups_dest_t  **dests,     /* IO - Destinations */
-             cups_ptype_t type,        /* I  - Printer type bits */
-             cups_ptype_t mask)        /* I  - Printer type mask */
-{
-  int          num_dests = 0;          /* Number of destinations */
-  cups_dest_t  *dest;                  /* Current destination */
-  ipp_t                *request,               /* IPP Request */
-               *response;              /* IPP Response */
-  ipp_attribute_t *attr;               /* Current attribute */
-  const char   *printer_name;          /* printer-name attribute */
-  char         uri[1024];              /* printer-uri value */
-  int          num_options;            /* Number of options */
-  cups_option_t        *options;               /* Options */
-#ifdef __APPLE__
-  char         media_default[41];      /* Default paper size */
-#endif /* __APPLE__ */
-  char         optname[1024],          /* Option name */
-               value[2048],            /* Option value */
-               *ptr;                   /* Pointer into name/value */
-  static const char * const pattrs[] = /* Attributes we're interested in */
-               {
-                 "auth-info-required",
-                 "device-uri",
-                 "job-sheets-default",
-                 "marker-change-time",
-                 "marker-colors",
-                 "marker-high-levels",
-                 "marker-levels",
-                 "marker-low-levels",
-                 "marker-message",
-                 "marker-names",
-                 "marker-types",
-#ifdef __APPLE__
-                 "media-supported",
-#endif /* __APPLE__ */
-                 "printer-commands",
-                 "printer-defaults",
-                 "printer-info",
-                 "printer-is-accepting-jobs",
-                 "printer-is-shared",
-                  "printer-is-temporary",
-                 "printer-location",
-                 "printer-make-and-model",
-                 "printer-mandatory-job-attributes",
-                 "printer-name",
-                 "printer-state",
-                 "printer-state-change-time",
-                 "printer-state-reasons",
-                 "printer-type",
-                 "printer-uri-supported"
-               };
+      if (!cupsGetDest(dest->name, NULL, num_reals, reals))
+      {
+       /*
+        * Remove the non-real printer from the list, since we don't want jobs
+        * going to an unexpected printer... (<rdar://problem/14216472>)
+        */
 
+        data.num_dests = cupsRemoveDest(dest->name, dest->instance, data.num_dests, &data.dests);
+      }
+    }
 
-  DEBUG_printf(("_cupsGetDests(http=%p, op=%x(%s), name=\"%s\", dests=%p, type=%x, mask=%x)", (void *)http, op, ippOpString(op), name, (void *)dests, type, mask));
+   /*
+    * Free memory...
+    */
+
+    free(reals);
+  }
 
-#ifdef __APPLE__
  /*
-  * Get the default paper size...
+  * Return the number of destinations...
   */
 
-  appleGetPaperSize(media_default, sizeof(media_default));
-#endif /* __APPLE__ */
+  *dests = data.dests;
 
- /*
-  * Build a IPP_OP_CUPS_GET_PRINTERS or IPP_OP_GET_PRINTER_ATTRIBUTES request, which
-  * require the following attributes:
-  *
-  *    attributes-charset
-  *    attributes-natural-language
-  *    requesting-user-name
-  *    printer-uri [for IPP_OP_GET_PRINTER_ATTRIBUTES]
-  */
+  if (data.num_dests > 0)
+    _cupsSetError(IPP_STATUS_OK, NULL, 0);
 
-  request = ippNewRequest(op);
+  DEBUG_printf(("1cupsGetDests2: Returning %d destinations.", data.num_dests));
 
-  ippAddStrings(request, IPP_TAG_OPERATION, IPP_TAG_KEYWORD,
-                "requested-attributes", sizeof(pattrs) / sizeof(pattrs[0]),
-               NULL, pattrs);
+  return (data.num_dests);
+}
 
-  ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_NAME,
-               "requesting-user-name", NULL, cupsUser());
 
-  if (name && op != IPP_OP_CUPS_GET_DEFAULT)
-  {
-    httpAssembleURIf(HTTP_URI_CODING_ALL, uri, sizeof(uri), "ipp", NULL,
-                     "localhost", ippPort(), "/printers/%s", name);
-    ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_URI, "printer-uri", NULL,
-                 uri);
-  }
-  else if (mask)
-  {
-    ippAddInteger(request, IPP_TAG_OPERATION, IPP_TAG_ENUM, "printer-type", (int)type);
-    ippAddInteger(request, IPP_TAG_OPERATION, IPP_TAG_ENUM, "printer-type-mask", (int)mask);
-  }
+/*
+ * 'cupsGetNamedDest()' - Get options for the named destination.
+ *
+ * This function is optimized for retrieving a single destination and should
+ * be used instead of @link cupsGetDests2@ and @link cupsGetDest@ when you
+ * either know the name of the destination or want to print to the default
+ * destination.  If @code NULL@ is returned, the destination does not exist or
+ * there is no default destination.
+ *
+ * If "http" is @code CUPS_HTTP_DEFAULT@, the connection to the default print
+ * server will be used.
+ *
+ * If "name" is @code NULL@, the default printer for the current user will be
+ * returned.
+ *
+ * The returned destination must be freed using @link cupsFreeDests@ with a
+ * "num_dests" value of 1.
+ *
+ * @since CUPS 1.4/macOS 10.6@
+ */
+
+cups_dest_t *                          /* O - Destination or @code NULL@ */
+cupsGetNamedDest(http_t     *http,     /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
+                 const char *name,     /* I - Destination name or @code NULL@ for the default destination */
+                 const char *instance) /* I - Instance name or @code NULL@ */
+{
+  const char    *dest_name;             /* Working destination name */
+  cups_dest_t  *dest;                  /* Destination */
+  char         filename[1024],         /* Path to lpoptions */
+               defname[256];           /* Default printer name */
+  const char   *home = getenv("HOME"); /* Home directory */
+  int          set_as_default = 0;     /* Set returned destination as default */
+  ipp_op_t     op = IPP_OP_GET_PRINTER_ATTRIBUTES;
+                                       /* IPP operation to get server ops */
+  _cups_globals_t *cg = _cupsGlobals();        /* Pointer to library globals */
+
+
+  DEBUG_printf(("cupsGetNamedDest(http=%p, name=\"%s\", instance=\"%s\")", (void *)http, name, instance));
 
  /*
-  * Do the request and get back a response...
+  * If "name" is NULL, find the default destination...
   */
 
-  if ((response = cupsDoRequest(http, request, "/")) != NULL)
+  dest_name = name;
+
+  if (!dest_name)
   {
-    for (attr = response->attrs; attr != NULL; attr = attr->next)
+    set_as_default = 1;
+    dest_name      = _cupsUserDefault(defname, sizeof(defname));
+
+    if (dest_name)
+    {
+      char     *ptr;                   /* Temporary pointer... */
+
+      if ((ptr = strchr(defname, '/')) != NULL)
+      {
+        *ptr++   = '\0';
+       instance = ptr;
+      }
+      else
+        instance = NULL;
+    }
+    else if (home)
     {
      /*
-      * Skip leading attributes until we hit a printer...
+      * No default in the environment, try the user's lpoptions files...
       */
 
-      while (attr != NULL && attr->group_tag != IPP_TAG_PRINTER)
-        attr = attr->next;
+      snprintf(filename, sizeof(filename), "%s/.cups/lpoptions", home);
 
-      if (attr == NULL)
-        break;
+      dest_name = cups_get_default(filename, defname, sizeof(defname), &instance);
+
+      if (dest_name)
+        set_as_default = 2;
+    }
 
+    if (!dest_name)
+    {
      /*
-      * Pull the needed attributes from this printer...
+      * Still not there?  Try the system lpoptions file...
       */
 
-      printer_name = NULL;
-      num_options  = 0;
-      options      = NULL;
+      snprintf(filename, sizeof(filename), "%s/lpoptions", cg->cups_serverroot);
+      dest_name = cups_get_default(filename, defname, sizeof(defname), &instance);
 
-      for (; attr && attr->group_tag == IPP_TAG_PRINTER; attr = attr->next)
-      {
-       if (attr->value_tag != IPP_TAG_INTEGER &&
-           attr->value_tag != IPP_TAG_ENUM &&
-           attr->value_tag != IPP_TAG_BOOLEAN &&
-           attr->value_tag != IPP_TAG_TEXT &&
-           attr->value_tag != IPP_TAG_TEXTLANG &&
-           attr->value_tag != IPP_TAG_NAME &&
-           attr->value_tag != IPP_TAG_NAMELANG &&
-           attr->value_tag != IPP_TAG_KEYWORD &&
-           attr->value_tag != IPP_TAG_RANGE &&
-           attr->value_tag != IPP_TAG_URI)
-          continue;
+      if (dest_name)
+        set_as_default = 3;
+    }
 
-        if (!strcmp(attr->name, "auth-info-required") ||
-           !strcmp(attr->name, "device-uri") ||
-           !strcmp(attr->name, "marker-change-time") ||
-           !strcmp(attr->name, "marker-colors") ||
-           !strcmp(attr->name, "marker-high-levels") ||
-           !strcmp(attr->name, "marker-levels") ||
-           !strcmp(attr->name, "marker-low-levels") ||
-           !strcmp(attr->name, "marker-message") ||
-           !strcmp(attr->name, "marker-names") ||
-           !strcmp(attr->name, "marker-types") ||
-           !strcmp(attr->name, "printer-commands") ||
-           !strcmp(attr->name, "printer-info") ||
-            !strcmp(attr->name, "printer-is-shared") ||
-            !strcmp(attr->name, "printer-is-temporary") ||
-           !strcmp(attr->name, "printer-make-and-model") ||
-           !strcmp(attr->name, "printer-mandatory-job-attributes") ||
-           !strcmp(attr->name, "printer-state") ||
-           !strcmp(attr->name, "printer-state-change-time") ||
-           !strcmp(attr->name, "printer-type") ||
-            !strcmp(attr->name, "printer-is-accepting-jobs") ||
-            !strcmp(attr->name, "printer-location") ||
-            !strcmp(attr->name, "printer-state-reasons") ||
-           !strcmp(attr->name, "printer-uri-supported"))
-        {
-        /*
-         * Add a printer description attribute...
-         */
+    if (!dest_name)
+    {
+     /*
+      * No locally-set default destination, ask the server...
+      */
 
-          num_options = cupsAddOption(attr->name,
-                                     cups_make_string(attr, value,
-                                                      sizeof(value)),
-                                     num_options, &options);
-       }
-#ifdef __APPLE__
-       else if (!strcmp(attr->name, "media-supported"))
-       {
-        /*
-         * See if we can set a default media size...
-         */
+      op             = IPP_OP_CUPS_GET_DEFAULT;
+      set_as_default = 4;
 
-          int  i;                      /* Looping var */
+      DEBUG_puts("1cupsGetNamedDest: Asking server for default printer...");
+    }
+    else
+      DEBUG_printf(("1cupsGetNamedDest: Using name=\"%s\"...", name));
+  }
 
-         for (i = 0; i < attr->num_values; i ++)
-           if (!_cups_strcasecmp(media_default, attr->values[i].string.text))
-           {
-             num_options = cupsAddOption("media", media_default, num_options,
-                                         &options);
-              break;
-           }
-       }
-#endif /* __APPLE__ */
-        else if (!strcmp(attr->name, "printer-name") &&
-                attr->value_tag == IPP_TAG_NAME)
-         printer_name = attr->values[0].string.text;
-        else if (strncmp(attr->name, "notify-", 7) &&
-                (attr->value_tag == IPP_TAG_BOOLEAN ||
-                 attr->value_tag == IPP_TAG_ENUM ||
-                 attr->value_tag == IPP_TAG_INTEGER ||
-                 attr->value_tag == IPP_TAG_KEYWORD ||
-                 attr->value_tag == IPP_TAG_NAME ||
-                 attr->value_tag == IPP_TAG_RANGE) &&
-                (ptr = strstr(attr->name, "-default")) != NULL)
-       {
-        /*
-         * Add a default option...
-         */
+ /*
+  * Get the printer's attributes...
+  */
 
-          strlcpy(optname, attr->name, sizeof(optname));
-         optname[ptr - attr->name] = '\0';
+  if (!_cupsGetDests(http, op, dest_name, &dest, 0, 0))
+  {
+    if (name)
+    {
+      _cups_namedata_t  data;           /* Callback data */
 
-         if (_cups_strcasecmp(optname, "media") ||
-             !cupsGetOption("media", num_options, options))
-           num_options = cupsAddOption(optname,
-                                       cups_make_string(attr, value,
-                                                        sizeof(value)),
-                                       num_options, &options);
-       }
-      }
+      DEBUG_puts("1cupsGetNamedDest: No queue found for printer, looking on network...");
 
-     /*
-      * See if we have everything needed...
-      */
+      data.name = name;
+      data.dest = NULL;
 
-      if (!printer_name)
-      {
-        cupsFreeOptions(num_options, options);
+      cupsEnumDests(0, 1000, NULL, 0, 0, (cups_dest_cb_t)cups_name_cb, &data);
 
-        if (attr == NULL)
-         break;
-       else
-          continue;
-      }
+      if (!data.dest)
+        return (NULL);
 
-      if ((dest = cups_add_dest(printer_name, NULL, &num_dests, dests)) != NULL)
+      dest = data.dest;
+    }
+    else
+    {
+      switch (set_as_default)
       {
-        dest->num_options = num_options;
-       dest->options     = options;
+        default :
+            break;
+
+        case 1 : /* Set from env vars */
+            if (getenv("LPDEST"))
+              _cupsSetError(IPP_STATUS_ERROR_NOT_FOUND, _("LPDEST environment variable names default destination that does not exist."), 1);
+           else if (getenv("PRINTER"))
+              _cupsSetError(IPP_STATUS_ERROR_NOT_FOUND, _("PRINTER environment variable names default destination that does not exist."), 1);
+           else
+              _cupsSetError(IPP_STATUS_ERROR_NOT_FOUND, _("No default destination."), 1);
+            break;
+
+        case 2 : /* Set from ~/.cups/lpoptions */
+           _cupsSetError(IPP_STATUS_ERROR_NOT_FOUND, _("~/.cups/lpoptions file names default destination that does not exist."), 1);
+            break;
+
+        case 3 : /* Set from /etc/cups/lpoptions */
+           _cupsSetError(IPP_STATUS_ERROR_NOT_FOUND, _("/etc/cups/lpoptions file names default destination that does not exist."), 1);
+            break;
+
+        case 4 : /* Set from server */
+           _cupsSetError(IPP_STATUS_ERROR_NOT_FOUND, _("No default destination."), 1);
+            break;
       }
-      else
-        cupsFreeOptions(num_options, options);
 
-      if (attr == NULL)
-       break;
+      return (NULL);
     }
-
-    ippDelete(response);
   }
 
+  DEBUG_printf(("1cupsGetNamedDest: Got dest=%p", (void *)dest));
+
+  if (instance)
+    dest->instance = _cupsStrAlloc(instance);
+
+  if (set_as_default)
+    dest->is_default = 1;
+
  /*
-  * Return the count...
+  * Then add local options...
   */
 
-  return (num_dests);
-}
+  snprintf(filename, sizeof(filename), "%s/lpoptions", cg->cups_serverroot);
+  cups_get_dests(filename, dest_name, instance, 1, 1, &dest);
 
+  if (home)
+  {
+    snprintf(filename, sizeof(filename), "%s/.cups/lpoptions", home);
 
-/*
- * 'cupsGetDests()' - Get the list of destinations from the default server.
- *
- * Starting with CUPS 1.2, the returned list of destinations include the
- * "printer-info", "printer-is-accepting-jobs", "printer-is-shared",
- * "printer-make-and-model", "printer-state", "printer-state-change-time",
- * "printer-state-reasons", "printer-type", and "printer-uri-supported"
- * attributes as options.
- *
- * CUPS 1.4 adds the "marker-change-time", "marker-colors",
- * "marker-high-levels", "marker-levels", "marker-low-levels", "marker-message",
- * "marker-names", "marker-types", and "printer-commands" attributes as options.
- *
- * CUPS 2.2 adds accessible IPP printers to the list of destinations that can
- * be used.  The "printer-uri-supported" option will be present for those IPP
- * printers that have been recently used.
- *
- * Use the @link cupsFreeDests@ function to free the destination list and
- * the @link cupsGetDest@ function to find a particular destination.
- *
- * @exclude all@
- */
+    cups_get_dests(filename, dest_name, instance, 1, 1, &dest);
+  }
 
-int                                    /* O - Number of destinations */
-cupsGetDests(cups_dest_t **dests)      /* O - Destinations */
-{
-  return (cupsGetDests2(CUPS_HTTP_DEFAULT, dests));
+ /*
+  * Return the result...
+  */
+
+  return (dest);
 }
 
 
 /*
- * 'cupsGetDests2()' - Get the list of destinations from the specified server.
- *
- * Starting with CUPS 1.2, the returned list of destinations include the
- * "printer-info", "printer-is-accepting-jobs", "printer-is-shared",
- * "printer-make-and-model", "printer-state", "printer-state-change-time",
- * "printer-state-reasons", "printer-type", and "printer-uri-supported"
- * attributes as options.
- *
- * CUPS 1.4 adds the "marker-change-time", "marker-colors",
- * "marker-high-levels", "marker-levels", "marker-low-levels", "marker-message",
- * "marker-names", "marker-types", and "printer-commands" attributes as options.
- *
- * CUPS 2.2 adds accessible IPP printers to the list of destinations that can
- * be used.  The "printer-uri-supported" option will be present for those IPP
- * printers that have been recently used.
+ * 'cupsRemoveDest()' - Remove a destination from the destination list.
  *
- * Use the @link cupsFreeDests@ function to free the destination list and
- * the @link cupsGetDest@ function to find a particular destination.
+ * Removing a destination/instance does not delete the class or printer
+ * queue, merely the lpoptions for that destination/instance.  Use the
+ * @link cupsSetDests@ or @link cupsSetDests2@ functions to save the new
+ * options for the user.
  *
- * @since CUPS 1.1.21/macOS 10.4@
+ * @since CUPS 1.3/macOS 10.5@
  */
 
-int                                    /* O - Number of destinations */
-cupsGetDests2(http_t      *http,       /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
-              cups_dest_t **dests)     /* O - Destinations */
+int                                    /* O  - New number of destinations */
+cupsRemoveDest(const char  *name,      /* I  - Destination name */
+               const char  *instance,  /* I  - Instance name or @code NULL@ */
+              int         num_dests,   /* I  - Number of destinations */
+              cups_dest_t **dests)     /* IO - Destinations */
 {
-  _cups_getdata_t data;                 /* Enumeration data */
-  cups_dest_t   *dest;                  /* Current destination */
-  const char   *home;                  /* HOME environment variable */
-  char         filename[1024];         /* Local ~/.cups/lpoptions file */
-  const char   *defprinter;            /* Default printer */
-  char         name[1024],             /* Copy of printer name */
-               *instance,              /* Pointer to instance name */
-               *user_default;          /* User default printer */
-  int          num_reals;              /* Number of real queues */
-  cups_dest_t  *reals;                 /* Real queues */
-  _cups_globals_t *cg = _cupsGlobals();        /* Pointer to library globals */
-
-
-  DEBUG_printf(("cupsGetDests2(http=%p, dests=%p)", (void *)http, (void *)dests));
-
-/*
-  * Range check the input...
-  */
+  int          i;                      /* Index into destinations */
+  cups_dest_t  *dest;                  /* Pointer to destination */
 
-  if (!dests)
-  {
-    _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("Bad NULL dests pointer"), 1);
-    DEBUG_puts("1cupsGetDests2: NULL dests pointer, returning 0.");
-    return (0);
-  }
 
  /*
-  * Grab the printers and classes...
+  * Find the destination...
   */
 
-  data.num_dests = 0;
-  data.dests     = NULL;
-
-  cupsEnumDests(0, 250, NULL, 0, 0, (cups_dest_cb_t)cups_get_cb, &data);
+  if ((dest = cupsGetDest(name, instance, num_dests, *dests)) == NULL)
+    return (num_dests);
 
  /*
-  * Make a copy of the "real" queues for a later sanity check...
+  * Free memory...
   */
 
-  if (data.num_dests > 0)
-  {
-    num_reals = data.num_dests;
-    reals     = calloc((size_t)num_reals, sizeof(cups_dest_t));
-
-    if (reals)
-      memcpy(reals, data.dests, (size_t)num_reals * sizeof(cups_dest_t));
-    else
-      num_reals = 0;
-  }
-  else
-  {
-    num_reals = 0;
-    reals     = NULL;
-  }
+  _cupsStrFree(dest->name);
+  _cupsStrFree(dest->instance);
+  cupsFreeOptions(dest->num_options, dest->options);
 
  /*
-  * Grab the default destination...
+  * Remove the destination from the array...
   */
 
-  if ((user_default = _cupsUserDefault(name, sizeof(name))) != NULL)
-    defprinter = name;
-  else if ((defprinter = cupsGetDefault2(http)) != NULL)
-  {
-    strlcpy(name, defprinter, sizeof(name));
-    defprinter = name;
-  }
-
-  if (defprinter)
-  {
-   /*
-    * Separate printer and instance name...
-    */
+  num_dests --;
 
-    if ((instance = strchr(name, '/')) != NULL)
-      *instance++ = '\0';
+  i = (int)(dest - *dests);
 
-   /*
-    * Lookup the printer and instance and make it the default...
-    */
+  if (i < num_dests)
+    memmove(dest, dest + 1, (size_t)(num_dests - i) * sizeof(cups_dest_t));
 
-    if ((dest = cupsGetDest(name, instance, data.num_dests, data.dests)) != NULL)
-      dest->is_default = 1;
-  }
-  else
-    instance = NULL;
+  return (num_dests);
+}
 
- /*
-  * Load the /etc/cups/lpoptions and ~/.cups/lpoptions files...
-  */
 
-  snprintf(filename, sizeof(filename), "%s/lpoptions", cg->cups_serverroot);
-  data.num_dests = cups_get_dests(filename, NULL, NULL, user_default != NULL, data.num_dests, &data.dests);
+/*
+ * 'cupsSetDefaultDest()' - Set the default destination.
+ *
+ * @since CUPS 1.3/macOS 10.5@
+ */
 
-  if ((home = getenv("HOME")) != NULL)
-  {
-    snprintf(filename, sizeof(filename), "%s/.cups/lpoptions", home);
+void
+cupsSetDefaultDest(
+    const char  *name,                 /* I - Destination name */
+    const char  *instance,             /* I - Instance name or @code NULL@ */
+    int         num_dests,             /* I - Number of destinations */
+    cups_dest_t *dests)                        /* I - Destinations */
+{
+  int          i;                      /* Looping var */
+  cups_dest_t  *dest;                  /* Current destination */
 
-    data.num_dests = cups_get_dests(filename, NULL, NULL, user_default != NULL, data.num_dests, &data.dests);
-  }
 
  /*
-  * Validate the current default destination - this prevents old
-  * Default lines in /etc/cups/lpoptions and ~/.cups/lpoptions from
-  * pointing to a non-existent printer or class...
+  * Range check input...
   */
 
-  if (num_reals)
-  {
-   /*
-    * See if we have a default printer...
-    */
-
-    if ((dest = cupsGetDest(NULL, NULL, data.num_dests, data.dests)) != NULL)
-    {
-     /*
-      * Have a default; see if it is real...
-      */
-
-      if (!cupsGetDest(dest->name, NULL, num_reals, reals))
-      {
-       /*
-        * Remove the non-real printer from the list, since we don't want jobs
-        * going to an unexpected printer... (<rdar://problem/14216472>)
-        */
-
-        data.num_dests = cupsRemoveDest(dest->name, dest->instance, data.num_dests, &data.dests);
-      }
-    }
-
-   /*
-    * Free memory...
-    */
-
-    free(reals);
-  }
+  if (!name || num_dests <= 0 || !dests)
+    return;
 
  /*
-  * Return the number of destinations...
+  * Loop through the array and set the "is_default" flag for the matching
+  * destination...
   */
 
-  *dests = data.dests;
+  for (i = num_dests, dest = dests; i > 0; i --, dest ++)
+    dest->is_default = !_cups_strcasecmp(name, dest->name) &&
+                       ((!instance && !dest->instance) ||
+                       (instance && dest->instance &&
+                        !_cups_strcasecmp(instance, dest->instance)));
+}
 
-  if (data.num_dests > 0)
-    _cupsSetError(IPP_STATUS_OK, NULL, 0);
 
-  DEBUG_printf(("1cupsGetDests2: Returning %d destinations.", data.num_dests));
+/*
+ * 'cupsSetDests()' - Save the list of destinations for the default server.
+ *
+ * This function saves the destinations to /etc/cups/lpoptions when run
+ * as root and ~/.cups/lpoptions when run as a normal user.
+ *
+ * @exclude all@
+ */
 
-  return (data.num_dests);
+void
+cupsSetDests(int         num_dests,    /* I - Number of destinations */
+             cups_dest_t *dests)       /* I - Destinations */
+{
+  cupsSetDests2(CUPS_HTTP_DEFAULT, num_dests, dests);
 }
 
 
 /*
- * 'cupsGetNamedDest()' - Get options for the named destination.
- *
- * This function is optimized for retrieving a single destination and should
- * be used instead of @link cupsGetDests2@ and @link cupsGetDest@ when you
- * either know the name of the destination or want to print to the default
- * destination.  If @code NULL@ is returned, the destination does not exist or
- * there is no default destination.
- *
- * If "http" is @code CUPS_HTTP_DEFAULT@, the connection to the default print
- * server will be used.
- *
- * If "name" is @code NULL@, the default printer for the current user will be
- * returned.
+ * 'cupsSetDests2()' - Save the list of destinations for the specified server.
  *
- * The returned destination must be freed using @link cupsFreeDests@ with a
- * "num_dests" value of 1.
+ * This function saves the destinations to /etc/cups/lpoptions when run
+ * as root and ~/.cups/lpoptions when run as a normal user.
  *
- * @since CUPS 1.4/macOS 10.6@
+ * @since CUPS 1.1.21/macOS 10.4@
  */
 
-cups_dest_t *                          /* O - Destination or @code NULL@ */
-cupsGetNamedDest(http_t     *http,     /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
-                 const char *name,     /* I - Destination name or @code NULL@ for the default destination */
-                 const char *instance) /* I - Instance name or @code NULL@ */
+int                                    /* O - 0 on success, -1 on error */
+cupsSetDests2(http_t      *http,       /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
+              int         num_dests,   /* I - Number of destinations */
+              cups_dest_t *dests)      /* I - Destinations */
 {
-  const char    *dest_name;             /* Working destination name */
-  cups_dest_t  *dest;                  /* Destination */
-  char         filename[1024],         /* Path to lpoptions */
-               defname[256];           /* Default printer name */
-  const char   *home = getenv("HOME"); /* Home directory */
-  int          set_as_default = 0;     /* Set returned destination as default */
-  ipp_op_t     op = IPP_OP_GET_PRINTER_ATTRIBUTES;
-                                       /* IPP operation to get server ops */
+  int          i, j;                   /* Looping vars */
+  int          wrote;                  /* Wrote definition? */
+  cups_dest_t  *dest;                  /* Current destination */
+  cups_option_t        *option;                /* Current option */
+  _ipp_option_t        *match;                 /* Matching attribute for option */
+  FILE         *fp;                    /* File pointer */
+#ifndef WIN32
+  const char   *home;                  /* HOME environment variable */
+#endif /* WIN32 */
+  char         filename[1024];         /* lpoptions file */
+  int          num_temps;              /* Number of temporary destinations */
+  cups_dest_t  *temps = NULL,          /* Temporary destinations */
+               *temp;                  /* Current temporary dest */
+  const char   *val;                   /* Value of temporary option */
   _cups_globals_t *cg = _cupsGlobals();        /* Pointer to library globals */
 
 
-  DEBUG_printf(("cupsGetNamedDest(http=%p, name=\"%s\", instance=\"%s\")", (void *)http, name, instance));
+ /*
+  * Range check the input...
+  */
+
+  if (!num_dests || !dests)
+    return (-1);
 
  /*
-  * If "name" is NULL, find the default destination...
+  * Get the server destinations...
   */
 
-  dest_name = name;
+  num_temps = _cupsGetDests(http, IPP_OP_CUPS_GET_PRINTERS, NULL, &temps, 0, 0);
 
-  if (!dest_name)
+  if (cupsLastError() >= IPP_STATUS_REDIRECTION_OTHER_SITE)
   {
-    set_as_default = 1;
-    dest_name      = _cupsUserDefault(defname, sizeof(defname));
-
-    if (dest_name)
-    {
-      char     *ptr;                   /* Temporary pointer... */
+    cupsFreeDests(num_temps, temps);
+    return (-1);
+  }
 
-      if ((ptr = strchr(defname, '/')) != NULL)
-      {
-        *ptr++   = '\0';
-       instance = ptr;
-      }
-      else
-        instance = NULL;
-    }
-    else if (home)
-    {
-     /*
-      * No default in the environment, try the user's lpoptions files...
-      */
+ /*
+  * Figure out which file to write to...
+  */
 
-      snprintf(filename, sizeof(filename), "%s/.cups/lpoptions", home);
+  snprintf(filename, sizeof(filename), "%s/lpoptions", cg->cups_serverroot);
 
-      dest_name = cups_get_default(filename, defname, sizeof(defname), &instance);
-    }
+#ifndef WIN32
+  if (getuid())
+  {
+   /*
+    * Merge in server defaults...
+    */
 
-    if (!dest_name)
-    {
-     /*
-      * Still not there?  Try the system lpoptions file...
-      */
+    num_temps = cups_get_dests(filename, NULL, NULL, 0, num_temps, &temps);
 
-      snprintf(filename, sizeof(filename), "%s/lpoptions", cg->cups_serverroot);
-      dest_name = cups_get_default(filename, defname, sizeof(defname), &instance);
-    }
+   /*
+    * Point to user defaults...
+    */
 
-    if (!dest_name)
+    if ((home = getenv("HOME")) != NULL)
     {
      /*
-      * No locally-set default destination, ask the server...
+      * Create ~/.cups subdirectory...
       */
 
-      op = IPP_OP_CUPS_GET_DEFAULT;
+      snprintf(filename, sizeof(filename), "%s/.cups", home);
+      if (access(filename, 0))
+        mkdir(filename, 0700);
 
-      DEBUG_puts("1cupsGetNamedDest: Asking server for default printer...");
+      snprintf(filename, sizeof(filename), "%s/.cups/lpoptions", home);
     }
-    else
-      DEBUG_printf(("1cupsGetNamedDest: Using name=\"%s\"...", name));
   }
+#endif /* !WIN32 */
 
  /*
-  * Get the printer's attributes...
+  * Try to open the file...
   */
 
-  if (!_cupsGetDests(http, op, dest_name, &dest, 0, 0))
+  if ((fp = fopen(filename, "w")) == NULL)
   {
-    if (name)
-    {
-      _cups_namedata_t  data;           /* Callback data */
+    cupsFreeDests(num_temps, temps);
+    return (-1);
+  }
 
-      DEBUG_puts("1cupsGetNamedDest: No queue found for printer, looking on network...");
+#ifndef WIN32
+ /*
+  * Set the permissions to 0644 when saving to the /etc/cups/lpoptions
+  * file...
+  */
 
-      data.name = name;
-      data.dest = NULL;
+  if (!getuid())
+    fchmod(fileno(fp), 0644);
+#endif /* !WIN32 */
 
-      cupsEnumDests(0, 1000, NULL, 0, 0, (cups_dest_cb_t)cups_name_cb, &data);
+ /*
+  * Write each printer; each line looks like:
+  *
+  *    Dest name[/instance] options
+  *    Default name[/instance] options
+  */
 
-      if (!data.dest)
-        return (NULL);
+  for (i = num_dests, dest = dests; i > 0; i --, dest ++)
+    if (dest->instance != NULL || dest->num_options != 0 || dest->is_default)
+    {
+      if (dest->is_default)
+      {
+       fprintf(fp, "Default %s", dest->name);
+       if (dest->instance)
+         fprintf(fp, "/%s", dest->instance);
 
-      dest = data.dest;
-    }
-    else
-      return (NULL);
-  }
+        wrote = 1;
+      }
+      else
+        wrote = 0;
 
-  DEBUG_printf(("1cupsGetNamedDest: Got dest=%p", (void *)dest));
+      if ((temp = cupsGetDest(dest->name, dest->instance, num_temps, temps)) == NULL)
+        temp = cupsGetDest(dest->name, NULL, num_temps, temps);
 
-  if (instance)
-    dest->instance = _cupsStrAlloc(instance);
+      for (j = dest->num_options, option = dest->options; j > 0; j --, option ++)
+      {
+       /*
+        * See if this option is a printer attribute; if so, skip it...
+       */
 
-  if (set_as_default)
-    dest->is_default = 1;
+        if ((match = _ippFindOption(option->name)) != NULL &&
+           match->group_tag == IPP_TAG_PRINTER)
+         continue;
 
- /*
-  * Then add local options...
-  */
+       /*
+       * See if the server/global options match these; if so, don't
+       * write 'em.
+       */
 
-  snprintf(filename, sizeof(filename), "%s/lpoptions", cg->cups_serverroot);
-  cups_get_dests(filename, dest_name, instance, 1, 1, &dest);
+        if (temp &&
+           (val = cupsGetOption(option->name, temp->num_options,
+                                temp->options)) != NULL &&
+            !_cups_strcasecmp(val, option->value))
+         continue;
 
-  if (home)
-  {
-    snprintf(filename, sizeof(filename), "%s/.cups/lpoptions", home);
+       /*
+        * Options don't match, write to the file...
+       */
 
-    cups_get_dests(filename, dest_name, instance, 1, 1, &dest);
-  }
+        if (!wrote)
+       {
+         fprintf(fp, "Dest %s", dest->name);
+         if (dest->instance)
+           fprintf(fp, "/%s", dest->instance);
+          wrote = 1;
+       }
 
- /*
-  * Return the result...
-  */
+        if (option->value[0])
+       {
+         if (strchr(option->value, ' ') ||
+             strchr(option->value, '\\') ||
+             strchr(option->value, '\"') ||
+             strchr(option->value, '\''))
+         {
+          /*
+           * Quote the value...
+           */
 
-  return (dest);
-}
+           fprintf(fp, " %s=\"", option->name);
 
+           for (val = option->value; *val; val ++)
+           {
+             if (strchr("\"\'\\", *val))
+               putc('\\', fp);
 
-/*
- * 'cupsRemoveDest()' - Remove a destination from the destination list.
- *
- * Removing a destination/instance does not delete the class or printer
- * queue, merely the lpoptions for that destination/instance.  Use the
- * @link cupsSetDests@ or @link cupsSetDests2@ functions to save the new
- * options for the user.
- *
- * @since CUPS 1.3/macOS 10.5@
- */
+              putc(*val, fp);
+           }
+
+           putc('\"', fp);
+          }
+         else
+         {
         /*
+           * Store the literal value...
          */
 
-int                                    /* O  - New number of destinations */
-cupsRemoveDest(const char  *name,      /* I  - Destination name */
-               const char  *instance,  /* I  - Instance name or @code NULL@ */
-              int         num_dests,   /* I  - Number of destinations */
-              cups_dest_t **dests)     /* IO - Destinations */
-{
-  int          i;                      /* Index into destinations */
-  cups_dest_t  *dest;                  /* Pointer to destination */
+           fprintf(fp, " %s=%s", option->name, option->value);
+          }
+       }
+       else
+         fprintf(fp, " %s", option->name);
+      }
 
+      if (wrote)
+        fputs("\n", fp);
+    }
 
  /*
-  * Find the destination...
+  * Free the temporary destinations and close the file...
   */
 
-  if ((dest = cupsGetDest(name, instance, num_dests, *dests)) == NULL)
-    return (num_dests);
+  cupsFreeDests(num_temps, temps);
 
+  fclose(fp);
+
+#ifdef __APPLE__
  /*
-  * Free memory...
+  * Set the default printer for this location - this allows command-line
+  * and GUI applications to share the same default destination...
   */
 
-  _cupsStrFree(dest->name);
-  _cupsStrFree(dest->instance);
-  cupsFreeOptions(dest->num_options, dest->options);
+  if ((dest = cupsGetDest(NULL, NULL, num_dests, dests)) != NULL)
+  {
+    CFStringRef name = CFStringCreateWithCString(kCFAllocatorDefault,
+                                                 dest->name,
+                                                 kCFStringEncodingUTF8);
+                                       /* Default printer name */
+
+    if (name)
+    {
+      _cupsAppleSetDefaultPrinter(name);
+      CFRelease(name);
+    }
+  }
+#endif /* __APPLE__ */
 
+#ifdef HAVE_NOTIFY_POST
  /*
-  * Remove the destination from the array...
+  * Send a notification so that macOS applications can know about the
+  * change, too.
   */
 
-  num_dests --;
-
-  i = (int)(dest - *dests);
-
-  if (i < num_dests)
-    memmove(dest, dest + 1, (size_t)(num_dests - i) * sizeof(cups_dest_t));
+  notify_post("com.apple.printerListChange");
+#endif /* HAVE_NOTIFY_POST */
 
-  return (num_dests);
+  return (0);
 }
 
 
 /*
- * 'cupsSetDefaultDest()' - Set the default destination.
- *
- * @since CUPS 1.3/macOS 10.5@
+ * '_cupsUserDefault()' - Get the user default printer from environment
+ *                        variables and location information.
  */
 
-void
-cupsSetDefaultDest(
-    const char  *name,                 /* I - Destination name */
-    const char  *instance,             /* I - Instance name or @code NULL@ */
-    int         num_dests,             /* I - Number of destinations */
-    cups_dest_t *dests)                        /* I - Destinations */
+char *                                 /* O - Default printer or NULL */
+_cupsUserDefault(char   *name,         /* I - Name buffer */
+                 size_t namesize)      /* I - Size of name buffer */
 {
-  int          i;                      /* Looping var */
-  cups_dest_t  *dest;                  /* Current destination */
+  const char   *env;                   /* LPDEST or PRINTER env variable */
+#ifdef __APPLE__
+  CFStringRef  locprinter;             /* Last printer as this location */
+#endif /* __APPLE__ */
 
 
- /*
-  * Range check input...
-  */
+  if ((env = getenv("LPDEST")) == NULL)
+    if ((env = getenv("PRINTER")) != NULL && !strcmp(env, "lp"))
+      env = NULL;
 
-  if (!name || num_dests <= 0 || !dests)
-    return;
+  if (env)
+  {
+    strlcpy(name, env, namesize);
+    return (name);
+  }
 
+#ifdef __APPLE__
  /*
-  * Loop through the array and set the "is_default" flag for the matching
-  * destination...
+  * Use location-based defaults if "use last printer" is selected in the
+  * system preferences...
   */
 
-  for (i = num_dests, dest = dests; i > 0; i --, dest ++)
-    dest->is_default = !_cups_strcasecmp(name, dest->name) &&
-                       ((!instance && !dest->instance) ||
-                       (instance && dest->instance &&
-                        !_cups_strcasecmp(instance, dest->instance)));
-}
+  if ((locprinter = _cupsAppleCopyDefaultPrinter()) != NULL)
+  {
+    CFStringGetCString(locprinter, name, (CFIndex)namesize, kCFStringEncodingUTF8);
+    CFRelease(locprinter);
+  }
+  else
+    name[0] = '\0';
 
+  DEBUG_printf(("1_cupsUserDefault: Returning \"%s\".", name));
 
-/*
- * 'cupsSetDests()' - Save the list of destinations for the default server.
- *
- * This function saves the destinations to /etc/cups/lpoptions when run
- * as root and ~/.cups/lpoptions when run as a normal user.
- *
- * @exclude all@
- */
+  return (*name ? name : NULL);
 
-void
-cupsSetDests(int         num_dests,    /* I - Number of destinations */
-             cups_dest_t *dests)       /* I - Destinations */
-{
-  cupsSetDests2(CUPS_HTTP_DEFAULT, num_dests, dests);
+#else
+ /*
+  * No location-based defaults on this platform...
+  */
+
+  name[0] = '\0';
+  return (NULL);
+#endif /* __APPLE__ */
 }
 
 
+#if _CUPS_LOCATION_DEFAULTS
 /*
- * 'cupsSetDests2()' - Save the list of destinations for the specified server.
- *
- * This function saves the destinations to /etc/cups/lpoptions when run
- * as root and ~/.cups/lpoptions when run as a normal user.
- *
- * @since CUPS 1.1.21/macOS 10.4@
+ * 'appleCopyLocations()' - Copy the location history array.
  */
 
-int                                    /* O - 0 on success, -1 on error */
-cupsSetDests2(http_t      *http,       /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
-              int         num_dests,   /* I - Number of destinations */
-              cups_dest_t *dests)      /* I - Destinations */
+static CFArrayRef                      /* O - Location array or NULL */
+appleCopyLocations(void)
 {
-  int          i, j;                   /* Looping vars */
-  int          wrote;                  /* Wrote definition? */
-  cups_dest_t  *dest;                  /* Current destination */
-  cups_option_t        *option;                /* Current option */
-  _ipp_option_t        *match;                 /* Matching attribute for option */
-  FILE         *fp;                    /* File pointer */
-#ifndef WIN32
-  const char   *home;                  /* HOME environment variable */
-#endif /* WIN32 */
-  char         filename[1024];         /* lpoptions file */
-  int          num_temps;              /* Number of temporary destinations */
-  cups_dest_t  *temps = NULL,          /* Temporary destinations */
-               *temp;                  /* Current temporary dest */
-  const char   *val;                   /* Value of temporary option */
-  _cups_globals_t *cg = _cupsGlobals();        /* Pointer to library globals */
-
-
- /*
-  * Range check the input...
-  */
+  CFArrayRef   locations;              /* Location array */
 
-  if (!num_dests || !dests)
-    return (-1);
 
  /*
-  * Get the server destinations...
+  * Look up the location array in the preferences...
   */
 
-  num_temps = _cupsGetDests(http, IPP_OP_CUPS_GET_PRINTERS, NULL, &temps, 0, 0);
+  if ((locations = CFPreferencesCopyAppValue(kLastUsedPrintersKey,
+                                             kCUPSPrintingPrefs)) == NULL)
+    return (NULL);
 
-  if (cupsLastError() >= IPP_STATUS_REDIRECTION_OTHER_SITE)
+  if (CFGetTypeID(locations) != CFArrayGetTypeID())
   {
-    cupsFreeDests(num_temps, temps);
-    return (-1);
+    CFRelease(locations);
+    return (NULL);
   }
 
- /*
-  * Figure out which file to write to...
-  */
+  return (locations);
+}
 
-  snprintf(filename, sizeof(filename), "%s/lpoptions", cg->cups_serverroot);
 
-#ifndef WIN32
-  if (getuid())
+/*
+ * 'appleCopyNetwork()' - Get the network ID for the current location.
+ */
+
+static CFStringRef                     /* O - Network ID */
+appleCopyNetwork(void)
+{
+  SCDynamicStoreRef    dynamicStore;   /* System configuration data */
+  CFStringRef          key;            /* Current network configuration key */
+  CFDictionaryRef      ip_dict;        /* Network configuration data */
+  CFStringRef          network = NULL; /* Current network ID */
+
+
+  if ((dynamicStore = SCDynamicStoreCreate(NULL, CFSTR("libcups"), NULL,
+                                           NULL)) != NULL)
   {
    /*
-    * Merge in server defaults...
+    * First use the IPv6 router address, if available, since that will generally
+    * be a globally-unique link-local address.
     */
 
-    num_temps = cups_get_dests(filename, NULL, NULL, 0, num_temps, &temps);
+    if ((key = SCDynamicStoreKeyCreateNetworkGlobalEntity(
+                   NULL, kSCDynamicStoreDomainState, kSCEntNetIPv6)) != NULL)
+    {
+      if ((ip_dict = SCDynamicStoreCopyValue(dynamicStore, key)) != NULL)
+      {
+       if ((network = CFDictionaryGetValue(ip_dict,
+                                           kSCPropNetIPv6Router)) != NULL)
+          CFRetain(network);
+
+        CFRelease(ip_dict);
+      }
+
+      CFRelease(key);
+    }
 
    /*
-    * Point to user defaults...
+    * If that doesn't work, try the IPv4 router address. This isn't as unique
+    * and will likely be a 10.x.y.z or 192.168.y.z address...
     */
 
-    if ((home = getenv("HOME")) != NULL)
+    if (!network)
     {
-     /*
-      * Create ~/.cups subdirectory...
-      */
-
-      snprintf(filename, sizeof(filename), "%s/.cups", home);
-      if (access(filename, 0))
-        mkdir(filename, 0700);
+      if ((key = SCDynamicStoreKeyCreateNetworkGlobalEntity(
+                    NULL, kSCDynamicStoreDomainState, kSCEntNetIPv4)) != NULL)
+      {
+       if ((ip_dict = SCDynamicStoreCopyValue(dynamicStore, key)) != NULL)
+       {
+         if ((network = CFDictionaryGetValue(ip_dict,
+                                             kSCPropNetIPv4Router)) != NULL)
+           CFRetain(network);
 
-      snprintf(filename, sizeof(filename), "%s/.cups/lpoptions", home);
-    }
-  }
-#endif /* !WIN32 */
+         CFRelease(ip_dict);
+       }
 
- /*
-  * Try to open the file...
-  */
+       CFRelease(key);
+      }
+    }
 
-  if ((fp = fopen(filename, "w")) == NULL)
-  {
-    cupsFreeDests(num_temps, temps);
-    return (-1);
+    CFRelease(dynamicStore);
   }
 
-#ifndef WIN32
- /*
-  * Set the permissions to 0644 when saving to the /etc/cups/lpoptions
-  * file...
-  */
+  return (network);
+}
+#endif /* _CUPS_LOCATION_DEFAULTS */
 
-  if (!getuid())
-    fchmod(fileno(fp), 0644);
-#endif /* !WIN32 */
 
- /*
-  * Write each printer; each line looks like:
-  *
-  *    Dest name[/instance] options
-  *    Default name[/instance] options
-  */
+#ifdef __APPLE__
+/*
+ * 'appleGetPaperSize()' - Get the default paper size.
+ */
 
-  for (i = num_dests, dest = dests; i > 0; i --, dest ++)
-    if (dest->instance != NULL || dest->num_options != 0 || dest->is_default)
-    {
-      if (dest->is_default)
-      {
-       fprintf(fp, "Default %s", dest->name);
-       if (dest->instance)
-         fprintf(fp, "/%s", dest->instance);
+static char *                          /* O - Default paper size */
+appleGetPaperSize(char   *name,                /* I - Paper size name buffer */
+                  size_t namesize)     /* I - Size of buffer */
+{
+  CFStringRef  defaultPaperID;         /* Default paper ID */
+  pwg_media_t  *pwgmedia;              /* PWG media size */
 
-        wrote = 1;
-      }
-      else
-        wrote = 0;
 
-      if ((temp = cupsGetDest(dest->name, dest->instance, num_temps, temps)) == NULL)
-        temp = cupsGetDest(dest->name, NULL, num_temps, temps);
+  defaultPaperID = _cupsAppleCopyDefaultPaperID();
+  if (!defaultPaperID ||
+      CFGetTypeID(defaultPaperID) != CFStringGetTypeID() ||
+      !CFStringGetCString(defaultPaperID, name, (CFIndex)namesize, kCFStringEncodingUTF8))
+    name[0] = '\0';
+  else if ((pwgmedia = pwgMediaForLegacy(name)) != NULL)
+    strlcpy(name, pwgmedia->pwg, namesize);
 
-      for (j = dest->num_options, option = dest->options; j > 0; j --, option ++)
-      {
-       /*
-        * See if this option is a printer attribute; if so, skip it...
-       */
+  if (defaultPaperID)
+    CFRelease(defaultPaperID);
 
-        if ((match = _ippFindOption(option->name)) != NULL &&
-           match->group_tag == IPP_TAG_PRINTER)
-         continue;
+  return (name);
+}
+#endif /* __APPLE__ */
 
-       /*
-       * See if the server/global options match these; if so, don't
-       * write 'em.
-       */
 
-        if (temp &&
-           (val = cupsGetOption(option->name, temp->num_options,
-                                temp->options)) != NULL &&
-            !_cups_strcasecmp(val, option->value))
-         continue;
+#if _CUPS_LOCATION_DEFAULTS
+/*
+ * 'appleGetPrinter()' - Get a printer from the history array.
+ */
 
-       /*
-        * Options don't match, write to the file...
-       */
+static CFStringRef                     /* O - Printer name or NULL */
+appleGetPrinter(CFArrayRef  locations, /* I - Location array */
+                CFStringRef network,   /* I - Network name */
+               CFIndex     *locindex)  /* O - Index in array */
+{
+  CFIndex              i,              /* Looping var */
+                       count;          /* Number of locations */
+  CFDictionaryRef      location;       /* Current location */
+  CFStringRef          locnetwork,     /* Current network */
+                       locprinter;     /* Current printer */
 
-        if (!wrote)
-       {
-         fprintf(fp, "Dest %s", dest->name);
-         if (dest->instance)
-           fprintf(fp, "/%s", dest->instance);
-          wrote = 1;
-       }
 
-        if (option->value[0])
-       {
-         if (strchr(option->value, ' ') ||
-             strchr(option->value, '\\') ||
-             strchr(option->value, '\"') ||
-             strchr(option->value, '\''))
-         {
-          /*
-           * Quote the value...
-           */
+  for (i = 0, count = CFArrayGetCount(locations); i < count; i ++)
+    if ((location = CFArrayGetValueAtIndex(locations, i)) != NULL &&
+        CFGetTypeID(location) == CFDictionaryGetTypeID())
+    {
+      if ((locnetwork = CFDictionaryGetValue(location,
+                                             kLocationNetworkKey)) != NULL &&
+          CFGetTypeID(locnetwork) == CFStringGetTypeID() &&
+         CFStringCompare(network, locnetwork, 0) == kCFCompareEqualTo &&
+         (locprinter = CFDictionaryGetValue(location,
+                                            kLocationPrinterIDKey)) != NULL &&
+         CFGetTypeID(locprinter) == CFStringGetTypeID())
+      {
+        if (locindex)
+         *locindex = i;
 
-           fprintf(fp, " %s=\"", option->name);
+       return (locprinter);
+      }
+    }
 
-           for (val = option->value; *val; val ++)
-           {
-             if (strchr("\"\'\\", *val))
-               putc('\\', fp);
+  return (NULL);
+}
+#endif /* _CUPS_LOCATION_DEFAULTS */
 
-              putc(*val, fp);
-           }
 
-           putc('\"', fp);
-          }
-         else
-         {
-          /*
-           * Store the literal value...
-           */
+/*
+ * 'cups_add_dest()' - Add a destination to the array.
+ *
+ * Unlike cupsAddDest(), this function does not check for duplicates.
+ */
 
-           fprintf(fp, " %s=%s", option->name, option->value);
-          }
-       }
-       else
-         fprintf(fp, " %s", option->name);
-      }
+static cups_dest_t *                   /* O  - New destination */
+cups_add_dest(const char  *name,       /* I  - Name of destination */
+              const char  *instance,   /* I  - Instance or NULL */
+              int         *num_dests,  /* IO - Number of destinations */
+             cups_dest_t **dests)      /* IO - Destinations */
+{
+  int          insert,                 /* Insertion point */
+               diff;                   /* Result of comparison */
+  cups_dest_t  *dest;                  /* Destination pointer */
 
-      if (wrote)
-        fputs("\n", fp);
-    }
 
  /*
-  * Free the temporary destinations and close the file...
+  * Add new destination...
   */
 
-  cupsFreeDests(num_temps, temps);
+  if (*num_dests == 0)
+    dest = malloc(sizeof(cups_dest_t));
+  else
+    dest = realloc(*dests, sizeof(cups_dest_t) * (size_t)(*num_dests + 1));
 
-  fclose(fp);
+  if (!dest)
+    return (NULL);
+
+  *dests = dest;
 
-#ifdef __APPLE__
  /*
-  * Set the default printer for this location - this allows command-line
-  * and GUI applications to share the same default destination...
+  * Find where to insert the destination...
   */
 
-  if ((dest = cupsGetDest(NULL, NULL, num_dests, dests)) != NULL)
+  if (*num_dests == 0)
+    insert = 0;
+  else
   {
-    CFStringRef name = CFStringCreateWithCString(kCFAllocatorDefault,
-                                                 dest->name,
-                                                 kCFStringEncodingUTF8);
-                                       /* Default printer name */
+    insert = cups_find_dest(name, instance, *num_dests, *dests, *num_dests - 1,
+                            &diff);
 
-    if (name)
-    {
-      _cupsAppleSetDefaultPrinter(name);
-      CFRelease(name);
-    }
+    if (diff > 0)
+      insert ++;
   }
-#endif /* __APPLE__ */
 
-#ifdef HAVE_NOTIFY_POST
  /*
-  * Send a notification so that macOS applications can know about the
-  * change, too.
+  * Move the array elements as needed...
   */
 
-  notify_post("com.apple.printerListChange");
-#endif /* HAVE_NOTIFY_POST */
-
-  return (0);
-}
+  if (insert < *num_dests)
+    memmove(*dests + insert + 1, *dests + insert, (size_t)(*num_dests - insert) * sizeof(cups_dest_t));
 
+  (*num_dests) ++;
 
-/*
- * '_cupsUserDefault()' - Get the user default printer from environment
- *                        variables and location information.
- */
+ /*
+  * Initialize the destination...
+  */
 
-char *                                 /* O - Default printer or NULL */
-_cupsUserDefault(char   *name,         /* I - Name buffer */
-                 size_t namesize)      /* I - Size of name buffer */
-{
-  const char   *env;                   /* LPDEST or PRINTER env variable */
-#ifdef __APPLE__
-  CFStringRef  locprinter;             /* Last printer as this location */
-#endif /* __APPLE__ */
+  dest              = *dests + insert;
+  dest->name        = _cupsStrAlloc(name);
+  dest->instance    = _cupsStrAlloc(instance);
+  dest->is_default  = 0;
+  dest->num_options = 0;
+  dest->options     = (cups_option_t *)0;
 
+  return (dest);
+}
 
-  if ((env = getenv("LPDEST")) == NULL)
-    if ((env = getenv("PRINTER")) != NULL && !strcmp(env, "lp"))
-      env = NULL;
 
-  if (env)
-  {
-    strlcpy(name, env, namesize);
-    return (name);
-  }
+#  ifdef __BLOCKS__
+/*
+ * 'cups_block_cb()' - Enumeration callback for block API.
+ */
 
-#ifdef __APPLE__
- /*
-  * Use location-based defaults if "use last printer" is selected in the
-  * system preferences...
-  */
+static int                             /* O - 1 to continue, 0 to stop */
+cups_block_cb(
+    cups_dest_block_t block,           /* I - Block */
+    unsigned          flags,           /* I - Destination flags */
+    cups_dest_t       *dest)           /* I - Destination */
+{
+  return ((block)(flags, dest));
+}
+#  endif /* __BLOCKS__ */
 
-  if ((locprinter = _cupsAppleCopyDefaultPrinter()) != NULL)
-  {
-    CFStringGetCString(locprinter, name, (CFIndex)namesize, kCFStringEncodingUTF8);
-    CFRelease(locprinter);
-  }
-  else
-    name[0] = '\0';
 
-  DEBUG_printf(("1_cupsUserDefault: Returning \"%s\".", name));
+/*
+ * 'cups_compare_dests()' - Compare two destinations.
+ */
 
-  return (*name ? name : NULL);
+static int                             /* O - Result of comparison */
+cups_compare_dests(cups_dest_t *a,     /* I - First destination */
+                   cups_dest_t *b)     /* I - Second destination */
+{
+  int  diff;                           /* Difference */
 
-#else
- /*
-  * No location-based defaults on this platform...
-  */
 
-  name[0] = '\0';
-  return (NULL);
-#endif /* __APPLE__ */
+  if ((diff = _cups_strcasecmp(a->name, b->name)) != 0)
+    return (diff);
+  else if (a->instance && b->instance)
+    return (_cups_strcasecmp(a->instance, b->instance));
+  else
+    return ((a->instance && !b->instance) - (!a->instance && b->instance));
 }
 
 
-#if _CUPS_LOCATION_DEFAULTS
+#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
+#  ifdef HAVE_DNSSD
 /*
- * 'appleCopyLocations()' - Copy the location history array.
+ * 'cups_dnssd_browse_cb()' - Browse for printers.
  */
 
-static CFArrayRef                      /* O - Location array or NULL */
-appleCopyLocations(void)
+static void
+cups_dnssd_browse_cb(
+    DNSServiceRef       sdRef,         /* I - Service reference */
+    DNSServiceFlags     flags,         /* I - Option flags */
+    uint32_t            interfaceIndex,        /* I - Interface number */
+    DNSServiceErrorType errorCode,     /* I - Error, if any */
+    const char          *serviceName,  /* I - Name of service/device */
+    const char          *regtype,      /* I - Type of service */
+    const char          *replyDomain,  /* I - Service domain */
+    void                *context)      /* I - Enumeration data */
 {
-  CFArrayRef   locations;              /* Location array */
+  _cups_dnssd_data_t   *data = (_cups_dnssd_data_t *)context;
+                                       /* Enumeration data */
 
 
+  DEBUG_printf(("5cups_dnssd_browse_cb(sdRef=%p, flags=%x, interfaceIndex=%d, errorCode=%d, serviceName=\"%s\", regtype=\"%s\", replyDomain=\"%s\", context=%p)", (void *)sdRef, flags, interfaceIndex, errorCode, serviceName, regtype, replyDomain, context));
+
  /*
-  * Look up the location array in the preferences...
+  * Don't do anything on error...
   */
 
-  if ((locations = CFPreferencesCopyAppValue(kLastUsedPrintersKey,
-                                             kCUPSPrintingPrefs)) == NULL)
-    return (NULL);
+  if (errorCode != kDNSServiceErr_NoError)
+    return;
 
-  if (CFGetTypeID(locations) != CFArrayGetTypeID())
-  {
-    CFRelease(locations);
-    return (NULL);
-  }
+ /*
+  * Get the device...
+  */
 
-  return (locations);
+  cups_dnssd_get_device(data, serviceName, regtype, replyDomain);
 }
 
 
+#  else /* HAVE_AVAHI */
 /*
- * 'appleCopyNetwork()' - Get the network ID for the current location.
+ * 'cups_dnssd_browse_cb()' - Browse for printers.
  */
 
-static CFStringRef                     /* O - Network ID */
-appleCopyNetwork(void)
+static void
+cups_dnssd_browse_cb(
+    AvahiServiceBrowser    *browser,   /* I - Browser */
+    AvahiIfIndex           interface,  /* I - Interface index (unused) */
+    AvahiProtocol          protocol,   /* I - Network protocol (unused) */
+    AvahiBrowserEvent      event,      /* I - What happened */
+    const char             *name,      /* I - Service name */
+    const char             *type,      /* I - Registration type */
+    const char             *domain,    /* I - Domain */
+    AvahiLookupResultFlags flags,      /* I - Flags */
+    void                   *context)   /* I - Devices array */
 {
-  SCDynamicStoreRef    dynamicStore;   /* System configuration data */
-  CFStringRef          key;            /* Current network configuration key */
-  CFDictionaryRef      ip_dict;        /* Network configuration data */
-  CFStringRef          network = NULL; /* Current network ID */
+#ifdef DEBUG
+  AvahiClient          *client = avahi_service_browser_get_client(browser);
+                                       /* Client information */
+#endif /* DEBUG */
+  _cups_dnssd_data_t   *data = (_cups_dnssd_data_t *)context;
+                                       /* Enumeration data */
 
 
-  if ((dynamicStore = SCDynamicStoreCreate(NULL, CFSTR("libcups"), NULL,
-                                           NULL)) != NULL)
-  {
-   /*
-    * First use the IPv6 router address, if available, since that will generally
-    * be a globally-unique link-local address.
-    */
+  (void)interface;
+  (void)protocol;
+  (void)context;
 
-    if ((key = SCDynamicStoreKeyCreateNetworkGlobalEntity(
-                   NULL, kSCDynamicStoreDomainState, kSCEntNetIPv6)) != NULL)
-    {
-      if ((ip_dict = SCDynamicStoreCopyValue(dynamicStore, key)) != NULL)
-      {
-       if ((network = CFDictionaryGetValue(ip_dict,
-                                           kSCPropNetIPv6Router)) != NULL)
-          CFRetain(network);
+  DEBUG_printf(("cups_dnssd_browse_cb(..., name=\"%s\", type=\"%s\", domain=\"%s\", ...);", name, type, domain));
 
-        CFRelease(ip_dict);
-      }
+  switch (event)
+  {
+    case AVAHI_BROWSER_FAILURE:
+       DEBUG_printf(("cups_dnssd_browse_cb: %s", avahi_strerror(avahi_client_errno(client))));
+       avahi_simple_poll_quit(data->simple_poll);
+       break;
 
-      CFRelease(key);
-    }
+    case AVAHI_BROWSER_NEW:
+       /*
+       * This object is new on the network.
+       */
 
-   /*
-    * If that doesn't work, try the IPv4 router address. This isn't as unique
-    * and will likely be a 10.x.y.z or 192.168.y.z address...
-    */
+       if (flags & AVAHI_LOOKUP_RESULT_LOCAL)
+       {
+        /*
+         * This comes from the local machine so ignore it.
+         */
 
-    if (!network)
-    {
-      if ((key = SCDynamicStoreKeyCreateNetworkGlobalEntity(
-                    NULL, kSCDynamicStoreDomainState, kSCEntNetIPv4)) != NULL)
-      {
-       if ((ip_dict = SCDynamicStoreCopyValue(dynamicStore, key)) != NULL)
+         DEBUG_printf(("cups_dnssd_browse_cb: Ignoring local service \"%s\".", name));
+       }
+       else
        {
-         if ((network = CFDictionaryGetValue(ip_dict,
-                                             kSCPropNetIPv4Router)) != NULL)
-           CFRetain(network);
+        /*
+         * Create a device entry for it if it doesn't yet exist.
+         */
 
-         CFRelease(ip_dict);
+         cups_dnssd_get_device(data, name, type, domain);
        }
+       break;
 
-       CFRelease(key);
-      }
-    }
+    case AVAHI_BROWSER_REMOVE :
+    case AVAHI_BROWSER_CACHE_EXHAUSTED :
+        break;
 
-    CFRelease(dynamicStore);
+    case AVAHI_BROWSER_ALL_FOR_NOW :
+        DEBUG_puts("cups_dnssd_browse_cb: ALL_FOR_NOW");
+        data->browsers --;
+        break;
   }
-
-  return (network);
 }
-#endif /* _CUPS_LOCATION_DEFAULTS */
 
 
-#ifdef __APPLE__
 /*
- * 'appleGetPaperSize()' - Get the default paper size.
+ * 'cups_dnssd_client_cb()' - Avahi client callback function.
  */
 
-static char *                          /* O - Default paper size */
-appleGetPaperSize(char   *name,                /* I - Paper size name buffer */
-                  size_t namesize)     /* I - Size of buffer */
+static void
+cups_dnssd_client_cb(
+    AvahiClient      *client,          /* I - Client information (unused) */
+    AvahiClientState state,            /* I - Current state */
+    void             *context)         /* I - User data (unused) */
 {
-  CFStringRef  defaultPaperID;         /* Default paper ID */
-  pwg_media_t  *pwgmedia;              /* PWG media size */
+  _cups_dnssd_data_t   *data = (_cups_dnssd_data_t *)context;
+                                       /* Enumeration data */
 
 
-  defaultPaperID = _cupsAppleCopyDefaultPaperID();
-  if (!defaultPaperID ||
-      CFGetTypeID(defaultPaperID) != CFStringGetTypeID() ||
-      !CFStringGetCString(defaultPaperID, name, (CFIndex)namesize, kCFStringEncodingUTF8))
-    name[0] = '\0';
-  else if ((pwgmedia = pwgMediaForLegacy(name)) != NULL)
-    strlcpy(name, pwgmedia->pwg, namesize);
+  (void)client;
 
-  if (defaultPaperID)
-    CFRelease(defaultPaperID);
+  DEBUG_printf(("cups_dnssd_client_cb(client=%p, state=%d, context=%p)", client, state, context));
 
-  return (name);
+ /*
+  * If the connection drops, quit.
+  */
+
+  if (state == AVAHI_CLIENT_FAILURE)
+  {
+    DEBUG_puts("cups_dnssd_client_cb: Avahi connection failed.");
+    avahi_simple_poll_quit(data->simple_poll);
+  }
 }
-#endif /* __APPLE__ */
+#  endif /* HAVE_DNSSD */
 
 
-#if _CUPS_LOCATION_DEFAULTS
 /*
- * 'appleGetPrinter()' - Get a printer from the history array.
+ * 'cups_dnssd_compare_device()' - Compare two devices.
  */
 
-static CFStringRef                     /* O - Printer name or NULL */
-appleGetPrinter(CFArrayRef  locations, /* I - Location array */
-                CFStringRef network,   /* I - Network name */
-               CFIndex     *locindex)  /* O - Index in array */
+static int                             /* O - Result of comparison */
+cups_dnssd_compare_devices(
+    _cups_dnssd_device_t *a,           /* I - First device */
+    _cups_dnssd_device_t *b)           /* I - Second device */
 {
-  CFIndex              i,              /* Looping var */
-                       count;          /* Number of locations */
-  CFDictionaryRef      location;       /* Current location */
-  CFStringRef          locnetwork,     /* Current network */
-                       locprinter;     /* Current printer */
+  return (strcmp(a->dest.name, b->dest.name));
+}
 
 
-  for (i = 0, count = CFArrayGetCount(locations); i < count; i ++)
-    if ((location = CFArrayGetValueAtIndex(locations, i)) != NULL &&
-        CFGetTypeID(location) == CFDictionaryGetTypeID())
-    {
-      if ((locnetwork = CFDictionaryGetValue(location,
-                                             kLocationNetworkKey)) != NULL &&
-          CFGetTypeID(locnetwork) == CFStringGetTypeID() &&
-         CFStringCompare(network, locnetwork, 0) == kCFCompareEqualTo &&
-         (locprinter = CFDictionaryGetValue(location,
-                                            kLocationPrinterIDKey)) != NULL &&
-         CFGetTypeID(locprinter) == CFStringGetTypeID())
-      {
-        if (locindex)
-         *locindex = i;
+/*
+ * 'cups_dnssd_free_device()' - Free the memory used by a device.
+ */
+
+static void
+cups_dnssd_free_device(
+    _cups_dnssd_device_t *device,      /* I - Device */
+    _cups_dnssd_data_t   *data)                /* I - Enumeration data */
+{
+  DEBUG_printf(("5cups_dnssd_free_device(device=%p(%s), data=%p)", (void *)device, device->dest.name, (void *)data));
+
+#  ifdef HAVE_DNSSD
+  if (device->ref)
+    DNSServiceRefDeallocate(device->ref);
+#  else /* HAVE_AVAHI */
+  if (device->ref)
+    avahi_record_browser_free(device->ref);
+#  endif /* HAVE_DNSSD */
 
-       return (locprinter);
-      }
-    }
+  _cupsStrFree(device->domain);
+  _cupsStrFree(device->fullName);
+  _cupsStrFree(device->regtype);
+  _cupsStrFree(device->dest.name);
 
-  return (NULL);
+  cupsFreeOptions(device->dest.num_options, device->dest.options);
+
+  free(device);
 }
-#endif /* _CUPS_LOCATION_DEFAULTS */
 
 
 /*
- * 'cups_add_dest()' - Add a destination to the array.
- *
- * Unlike cupsAddDest(), this function does not check for duplicates.
+ * 'cups_dnssd_get_device()' - Lookup a device and create it as needed.
  */
 
-static cups_dest_t *                   /* O  - New destination */
-cups_add_dest(const char  *name,       /* I  - Name of destination */
-              const char  *instance,   /* I  - Instance or NULL */
-              int         *num_dests,  /* IO - Number of destinations */
-             cups_dest_t **dests)      /* IO - Destinations */
+static _cups_dnssd_device_t *          /* O - Device */
+cups_dnssd_get_device(
+    _cups_dnssd_data_t *data,          /* I - Enumeration data */
+    const char         *serviceName,   /* I - Service name */
+    const char         *regtype,       /* I - Registration type */
+    const char         *replyDomain)   /* I - Domain name */
 {
-  int          insert,                 /* Insertion point */
-               diff;                   /* Result of comparison */
-  cups_dest_t  *dest;                  /* Destination pointer */
+  _cups_dnssd_device_t key,            /* Search key */
+                       *device;        /* Device */
+  char                 fullName[kDNSServiceMaxDomainName],
+                                       /* Full name for query */
+                       name[128];      /* Queue name */
 
 
+  DEBUG_printf(("5cups_dnssd_get_device(data=%p, serviceName=\"%s\", regtype=\"%s\", replyDomain=\"%s\")", (void *)data, serviceName, regtype, replyDomain));
+
  /*
-  * Add new destination...
+  * See if this is an existing device...
   */
 
-  if (*num_dests == 0)
-    dest = malloc(sizeof(cups_dest_t));
-  else
-    dest = realloc(*dests, sizeof(cups_dest_t) * (size_t)(*num_dests + 1));
+  cups_queue_name(name, serviceName, sizeof(name));
 
-  if (!dest)
-    return (NULL);
+  key.dest.name = name;
 
-  *dests = dest;
+  if ((device = cupsArrayFind(data->devices, &key)) != NULL)
+  {
+   /*
+    * Yes, see if we need to do anything with this...
+    */
 
- /*
-  * Find where to insert the destination...
-  */
+    int        update = 0;                     /* Non-zero if we need to update */
 
-  if (*num_dests == 0)
-    insert = 0;
+    if (!_cups_strcasecmp(replyDomain, "local.") &&
+       _cups_strcasecmp(device->domain, replyDomain))
+    {
+     /*
+      * Update the "global" listing to use the .local domain name instead.
+      */
+
+      _cupsStrFree(device->domain);
+      device->domain = _cupsStrAlloc(replyDomain);
+
+      DEBUG_printf(("6cups_dnssd_get_device: Updating '%s' to use local "
+                    "domain.", device->dest.name));
+
+      update = 1;
+    }
+
+    if (!_cups_strcasecmp(regtype, "_ipps._tcp") &&
+       _cups_strcasecmp(device->regtype, regtype))
+    {
+     /*
+      * Prefer IPPS over IPP.
+      */
+
+      _cupsStrFree(device->regtype);
+      device->regtype = _cupsStrAlloc(regtype);
+
+      DEBUG_printf(("6cups_dnssd_get_device: Updating '%s' to use IPPS.",
+                   device->dest.name));
+
+      update = 1;
+    }
+
+    if (!update)
+    {
+      DEBUG_printf(("6cups_dnssd_get_device: No changes to '%s'.",
+                    device->dest.name));
+      return (device);
+    }
+  }
   else
   {
-    insert = cups_find_dest(name, instance, *num_dests, *dests, *num_dests - 1,
-                            &diff);
+   /*
+    * No, add the device...
+    */
 
-    if (diff > 0)
-      insert ++;
-  }
+    DEBUG_printf(("6cups_dnssd_get_device: Adding '%s' for %s with domain "
+                  "'%s'.", serviceName,
+                  !strcmp(regtype, "_ipps._tcp") ? "IPPS" : "IPP",
+                  replyDomain));
 
- /*
-  * Move the array elements as needed...
-  */
+    device            = calloc(sizeof(_cups_dnssd_device_t), 1);
+    device->dest.name = _cupsStrAlloc(name);
+    device->domain    = _cupsStrAlloc(replyDomain);
+    device->regtype   = _cupsStrAlloc(regtype);
 
-  if (insert < *num_dests)
-    memmove(*dests + insert + 1, *dests + insert, (size_t)(*num_dests - insert) * sizeof(cups_dest_t));
+    device->dest.num_options = cupsAddOption("printer-info", serviceName, 0, &device->dest.options);
 
-  (*num_dests) ++;
+    cupsArrayAdd(data->devices, device);
+  }
 
  /*
-  * Initialize the destination...
+  * Set the "full name" of this service, which is used for queries...
   */
 
-  dest              = *dests + insert;
-  dest->name        = _cupsStrAlloc(name);
-  dest->instance    = _cupsStrAlloc(instance);
-  dest->is_default  = 0;
-  dest->num_options = 0;
-  dest->options     = (cups_option_t *)0;
-
-  return (dest);
-}
-
-
-#  ifdef __BLOCKS__
-/*
- * 'cups_block_cb()' - Enumeration callback for block API.
- */
+#  ifdef HAVE_DNSSD
+  DNSServiceConstructFullName(fullName, serviceName, regtype, replyDomain);
+#  else /* HAVE_AVAHI */
+  avahi_service_name_join(fullName, kDNSServiceMaxDomainName, serviceName, regtype, replyDomain);
+#  endif /* HAVE_DNSSD */
 
-static int                             /* O - 1 to continue, 0 to stop */
-cups_block_cb(
-    cups_dest_block_t block,           /* I - Block */
-    unsigned          flags,           /* I - Destination flags */
-    cups_dest_t       *dest)           /* I - Destination */
-{
-  return ((block)(flags, dest));
-}
-#  endif /* __BLOCKS__ */
+  _cupsStrFree(device->fullName);
+  device->fullName = _cupsStrAlloc(fullName);
 
+  if (device->ref)
+  {
+#  ifdef HAVE_DNSSD
+    DNSServiceRefDeallocate(device->ref);
+#  else /* HAVE_AVAHI */
+    avahi_record_browser_free(device->ref);
+#  endif /* HAVE_DNSSD */
 
-/*
- * 'cups_compare_dests()' - Compare two destinations.
- */
+    device->ref = 0;
+  }
 
-static int                             /* O - Result of comparison */
-cups_compare_dests(cups_dest_t *a,     /* I - First destination */
-                   cups_dest_t *b)     /* I - Second destination */
-{
-  int  diff;                           /* Difference */
+  if (device->state == _CUPS_DNSSD_ACTIVE)
+  {
+    DEBUG_printf(("6cups_dnssd_get_device: Remove callback for \"%s\".", device->dest.name));
 
+    (*data->cb)(data->user_data, CUPS_DEST_FLAGS_REMOVED, &device->dest);
+    device->state = _CUPS_DNSSD_NEW;
+  }
 
-  if ((diff = _cups_strcasecmp(a->name, b->name)) != 0)
-    return (diff);
-  else if (a->instance && b->instance)
-    return (_cups_strcasecmp(a->instance, b->instance));
-  else
-    return ((a->instance && !b->instance) - (!a->instance && b->instance));
+  return (device);
 }
 
 
-#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
 #  ifdef HAVE_DNSSD
 /*
- * 'cups_dnssd_browse_cb()' - Browse for printers.
+ * 'cups_dnssd_local_cb()' - Browse for local printers.
  */
 
 static void
-cups_dnssd_browse_cb(
+cups_dnssd_local_cb(
     DNSServiceRef       sdRef,         /* I - Service reference */
     DNSServiceFlags     flags,         /* I - Option flags */
     uint32_t            interfaceIndex,        /* I - Interface number */
@@ -3030,878 +3000,1009 @@ cups_dnssd_browse_cb(
     const char          *serviceName,  /* I - Name of service/device */
     const char          *regtype,      /* I - Type of service */
     const char          *replyDomain,  /* I - Service domain */
-    void                *context)      /* I - Enumeration data */
+    void                *context)      /* I - Devices array */
+{
+  _cups_dnssd_data_t   *data = (_cups_dnssd_data_t *)context;
+                                       /* Enumeration data */
+  _cups_dnssd_device_t *device;        /* Device */
+
+
+  DEBUG_printf(("5cups_dnssd_local_cb(sdRef=%p, flags=%x, interfaceIndex=%d, errorCode=%d, serviceName=\"%s\", regtype=\"%s\", replyDomain=\"%s\", context=%p)", (void *)sdRef, flags, interfaceIndex, errorCode, serviceName, regtype, replyDomain, context));
+
+ /*
+  * Only process "add" data...
+  */
+
+  if (errorCode != kDNSServiceErr_NoError || !(flags & kDNSServiceFlagsAdd))
+    return;
+
+ /*
+  * Get the device...
+  */
+
+  device = cups_dnssd_get_device(data, serviceName, regtype, replyDomain);
+
+ /*
+  * Hide locally-registered devices...
+  */
+
+  DEBUG_printf(("6cups_dnssd_local_cb: Hiding local printer '%s'.",
+                serviceName));
+
+  if (device->ref)
+  {
+    DNSServiceRefDeallocate(device->ref);
+    device->ref = 0;
+  }
+
+  if (device->state == _CUPS_DNSSD_ACTIVE)
+  {
+    DEBUG_printf(("6cups_dnssd_local_cb: Remove callback for \"%s\".", device->dest.name));
+    (*data->cb)(data->user_data, CUPS_DEST_FLAGS_REMOVED, &device->dest);
+  }
+
+  device->state = _CUPS_DNSSD_LOCAL;
+}
+#  endif /* HAVE_DNSSD */
+
+
+#  ifdef HAVE_AVAHI
+/*
+ * 'cups_dnssd_poll_cb()' - Wait for input on the specified file descriptors.
+ *
+ * Note: This function is needed because avahi_simple_poll_iterate is broken
+ *       and always uses a timeout of 0 (!) milliseconds.
+ *       (https://github.com/lathiat/avahi/issues/127)
+ *
+ * @private@
+ */
+
+static int                             /* O - Number of file descriptors matching */
+cups_dnssd_poll_cb(
+    struct pollfd *pollfds,            /* I - File descriptors */
+    unsigned int  num_pollfds,         /* I - Number of file descriptors */
+    int           timeout,             /* I - Timeout in milliseconds (unused) */
+    void          *context)            /* I - User data (unused) */
 {
   _cups_dnssd_data_t   *data = (_cups_dnssd_data_t *)context;
                                        /* Enumeration data */
+  int                  val;            /* Return value */
 
 
-  DEBUG_printf(("5cups_dnssd_browse_cb(sdRef=%p, flags=%x, interfaceIndex=%d, errorCode=%d, serviceName=\"%s\", regtype=\"%s\", replyDomain=\"%s\", context=%p)", (void *)sdRef, flags, interfaceIndex, errorCode, serviceName, regtype, replyDomain, context));
+  DEBUG_printf(("cups_dnssd_poll_cb(pollfds=%p, num_pollfds=%d, timeout=%d, context=%p)", pollfds, num_pollfds, timeout, context));
 
- /*
-  * Don't do anything on error...
-  */
+  (void)timeout;
 
-  if (errorCode != kDNSServiceErr_NoError)
-    return;
+  val = poll(pollfds, num_pollfds, _CUPS_DNSSD_MAXTIME);
 
- /*
-  * Get the device...
-  */
+  DEBUG_printf(("cups_dnssd_poll_cb: poll() returned %d", val));
 
-  cups_dnssd_get_device(data, serviceName, regtype, replyDomain);
+  if (val < 0)
+  {
+    DEBUG_printf(("cups_dnssd_poll_cb: %s", strerror(errno)));
+  }
+  else if (val > 0)
+  {
+    data->got_data = 1;
+  }
+
+  return (val);
 }
+#  endif /* HAVE_AVAHI */
 
 
-#  else /* HAVE_AVAHI */
 /*
- * 'cups_dnssd_browse_cb()' - Browse for printers.
+ * 'cups_dnssd_query_cb()' - Process query data.
  */
 
+#  ifdef HAVE_DNSSD
 static void
-cups_dnssd_browse_cb(
-    AvahiServiceBrowser    *browser,   /* I - Browser */
-    AvahiIfIndex           interface,  /* I - Interface index (unused) */
+cups_dnssd_query_cb(
+    DNSServiceRef       sdRef,         /* I - Service reference */
+    DNSServiceFlags     flags,         /* I - Data flags */
+    uint32_t            interfaceIndex,        /* I - Interface */
+    DNSServiceErrorType errorCode,     /* I - Error, if any */
+    const char          *fullName,     /* I - Full service name */
+    uint16_t            rrtype,                /* I - Record type */
+    uint16_t            rrclass,       /* I - Record class */
+    uint16_t            rdlen,         /* I - Length of record data */
+    const void          *rdata,                /* I - Record data */
+    uint32_t            ttl,           /* I - Time-to-live */
+    void                *context)      /* I - Enumeration data */
+{
+#  else /* HAVE_AVAHI */
+static void
+cups_dnssd_query_cb(
+    AvahiRecordBrowser     *browser,   /* I - Record browser */
+    AvahiIfIndex           interfaceIndex,
+                                       /* I - Interface index (unused) */
     AvahiProtocol          protocol,   /* I - Network protocol (unused) */
-    AvahiBrowserEvent      event,      /* I - What happened */
-    const char             *name,      /* I - Service name */
-    const char             *type,      /* I - Registration type */
-    const char             *domain,    /* I - Domain */
+    AvahiBrowserEvent      event,      /* I - What happened? */
+    const char             *fullName,  /* I - Service name */
+    uint16_t               rrclass,    /* I - Record class */
+    uint16_t               rrtype,     /* I - Record type */
+    const void             *rdata,     /* I - TXT record */
+    size_t                 rdlen,      /* I - Length of TXT record */
     AvahiLookupResultFlags flags,      /* I - Flags */
-    void                   *context)   /* I - Devices array */
+    void                   *context)   /* I - Enumeration data */
 {
-#ifdef DEBUG
-  AvahiClient          *client = avahi_service_browser_get_client(browser);
+#    ifdef DEBUG
+  AvahiClient          *client = avahi_record_browser_get_client(browser);
                                        /* Client information */
-#endif /* DEBUG */
+#    endif /* DEBUG */
+#  endif /* HAVE_DNSSD */
   _cups_dnssd_data_t   *data = (_cups_dnssd_data_t *)context;
                                        /* Enumeration data */
+  char                 serviceName[256],/* Service name */
+                       name[128],      /* Queue name */
+                       *ptr;           /* Pointer into string */
+  _cups_dnssd_device_t dkey,           /* Search key */
+                       *device;        /* Device */
 
 
-  (void)interface;
-  (void)protocol;
-  (void)context;
-
-  DEBUG_printf(("cups_dnssd_browse_cb(..., name=\"%s\", type=\"%s\", domain=\"%s\", ...);", name, type, domain));
-
-  switch (event)
-  {
-    case AVAHI_BROWSER_FAILURE:
-       DEBUG_printf(("cups_dnssd_browse_cb: %s", avahi_strerror(avahi_client_errno(client))));
-       avahi_simple_poll_quit(data->simple_poll);
-       break;
+#  ifdef HAVE_DNSSD
+  DEBUG_printf(("5cups_dnssd_query_cb(sdRef=%p, flags=%x, interfaceIndex=%d, errorCode=%d, fullName=\"%s\", rrtype=%u, rrclass=%u, rdlen=%u, rdata=%p, ttl=%u, context=%p)", (void *)sdRef, flags, interfaceIndex, errorCode, fullName, rrtype, rrclass, rdlen, rdata, ttl, context));
 
-    case AVAHI_BROWSER_NEW:
-       /*
-       * This object is new on the network.
-       */
+ /*
+  * Only process "add" data...
+  */
 
-       if (flags & AVAHI_LOOKUP_RESULT_LOCAL)
-       {
-        /*
-         * This comes from the local machine so ignore it.
-         */
+  if (errorCode != kDNSServiceErr_NoError || !(flags & kDNSServiceFlagsAdd))
+    return;
 
-         DEBUG_printf(("cups_dnssd_browse_cb: Ignoring local service \"%s\".", name));
-       }
-       else
-       {
-        /*
-         * Create a device entry for it if it doesn't yet exist.
-         */
+#  else /* HAVE_AVAHI */
+  DEBUG_printf(("cups_dnssd_query_cb(browser=%p, interfaceIndex=%d, protocol=%d, event=%d, fullName=\"%s\", rrclass=%u, rrtype=%u, rdata=%p, rdlen=%u, flags=%x, context=%p)", browser, interfaceIndex, protocol, event, fullName, rrclass, rrtype, rdata, (unsigned)rdlen, flags, context));
 
-         cups_dnssd_get_device(data, name, type, domain);
-       }
-       break;
+ /*
+  * Only process "add" data...
+  */
 
-    case AVAHI_BROWSER_REMOVE :
-    case AVAHI_BROWSER_CACHE_EXHAUSTED :
-        break;
+  if (event != AVAHI_BROWSER_NEW)
+  {
+    if (event == AVAHI_BROWSER_FAILURE)
+      DEBUG_printf(("cups_dnssd_query_cb: %s", avahi_strerror(avahi_client_errno(client))));
 
-    case AVAHI_BROWSER_ALL_FOR_NOW :
-        DEBUG_puts("cups_dnssd_browse_cb: ALL_FOR_NOW");
-        data->browsers --;
-        break;
+    return;
   }
-}
+#  endif /* HAVE_DNSSD */
 
+ /*
+  * Lookup the service in the devices array.
+  */
 
-/*
- * 'cups_dnssd_client_cb()' - Avahi client callback function.
- */
+  cups_dnssd_unquote(serviceName, fullName, sizeof(serviceName));
 
-static void
-cups_dnssd_client_cb(
-    AvahiClient      *client,          /* I - Client information (unused) */
-    AvahiClientState state,            /* I - Current state */
-    void             *context)         /* I - User data (unused) */
-{
-  _cups_dnssd_data_t   *data = (_cups_dnssd_data_t *)context;
-                                       /* Enumeration data */
+  if ((ptr = strstr(serviceName, "._")) != NULL)
+    *ptr = '\0';
 
+  cups_queue_name(name, serviceName, sizeof(name));
 
-  (void)client;
+  dkey.dest.name = name;
 
-  DEBUG_printf(("cups_dnssd_client_cb(client=%p, state=%d, context=%p)", client, state, context));
+  if ((device = cupsArrayFind(data->devices, &dkey)) != NULL && device->state == _CUPS_DNSSD_NEW)
+  {
+   /*
+    * Found it, pull out the make and model from the TXT record and save it...
+    */
 
- /*
-  * If the connection drops, quit.
-  */
+    const uint8_t      *txt,           /* Pointer into data */
+                       *txtnext,       /* Next key/value pair */
+                       *txtend;        /* End of entire TXT record */
+    uint8_t            txtlen;         /* Length of current key/value pair */
+    char               key[256],       /* Key string */
+                       value[256],     /* Value string */
+                       make_and_model[512],
+                                       /* Manufacturer and model */
+                       model[256],     /* Model */
+                       uriname[1024],  /* Name for URI */
+                       uri[1024];      /* Printer URI */
+    cups_ptype_t       type = CUPS_PRINTER_DISCOVERED | CUPS_PRINTER_BW;
+                                       /* Printer type */
+    int                        saw_printer_type = 0;
+                                       /* Did we see a printer-type key? */
 
-  if (state == AVAHI_CLIENT_FAILURE)
-  {
-    DEBUG_puts("cups_dnssd_client_cb: Avahi connection failed.");
-    avahi_simple_poll_quit(data->simple_poll);
-  }
-}
-#  endif /* HAVE_DNSSD */
+    device->state     = _CUPS_DNSSD_PENDING;
+    make_and_model[0] = '\0';
 
+    strlcpy(model, "Unknown", sizeof(model));
 
-/*
- * 'cups_dnssd_compare_device()' - Compare two devices.
- */
+    for (txt = rdata, txtend = txt + rdlen;
+        txt < txtend;
+        txt = txtnext)
+    {
+     /*
+      * Read a key/value pair starting with an 8-bit length.  Since the
+      * length is 8 bits and the size of the key/value buffers is 256, we
+      * don't need to check for overflow...
+      */
 
-static int                             /* O - Result of comparison */
-cups_dnssd_compare_devices(
-    _cups_dnssd_device_t *a,           /* I - First device */
-    _cups_dnssd_device_t *b)           /* I - Second device */
-{
-  return (strcmp(a->dest.name, b->dest.name));
-}
+      txtlen = *txt++;
 
+      if (!txtlen || (txt + txtlen) > txtend)
+       break;
 
-/*
- * 'cups_dnssd_free_device()' - Free the memory used by a device.
- */
+      txtnext = txt + txtlen;
 
-static void
-cups_dnssd_free_device(
-    _cups_dnssd_device_t *device,      /* I - Device */
-    _cups_dnssd_data_t   *data)                /* I - Enumeration data */
-{
-  DEBUG_printf(("5cups_dnssd_free_device(device=%p(%s), data=%p)", (void *)device, device->dest.name, (void *)data));
+      for (ptr = key; txt < txtnext && *txt != '='; txt ++)
+       *ptr++ = (char)*txt;
+      *ptr = '\0';
 
-#  ifdef HAVE_DNSSD
-  if (device->ref)
-    DNSServiceRefDeallocate(device->ref);
-#  else /* HAVE_AVAHI */
-  if (device->ref)
-    avahi_record_browser_free(device->ref);
-#  endif /* HAVE_DNSSD */
+      if (txt < txtnext && *txt == '=')
+      {
+       txt ++;
 
-  _cupsStrFree(device->domain);
-  _cupsStrFree(device->fullName);
-  _cupsStrFree(device->regtype);
-  _cupsStrFree(device->dest.name);
+       if (txt < txtnext)
+         memcpy(value, txt, (size_t)(txtnext - txt));
+       value[txtnext - txt] = '\0';
 
-  cupsFreeOptions(device->dest.num_options, device->dest.options);
+       DEBUG_printf(("6cups_dnssd_query_cb: %s=%s", key, value));
+      }
+      else
+      {
+       DEBUG_printf(("6cups_dnssd_query_cb: '%s' with no value.", key));
+       continue;
+      }
 
-  free(device);
-}
+      if (!_cups_strcasecmp(key, "usb_MFG") ||
+          !_cups_strcasecmp(key, "usb_MANU") ||
+         !_cups_strcasecmp(key, "usb_MANUFACTURER"))
+       strlcpy(make_and_model, value, sizeof(make_and_model));
+      else if (!_cups_strcasecmp(key, "usb_MDL") ||
+               !_cups_strcasecmp(key, "usb_MODEL"))
+       strlcpy(model, value, sizeof(model));
+      else if (!_cups_strcasecmp(key, "product") && !strstr(value, "Ghostscript"))
+      {
+       if (value[0] == '(')
+       {
+        /*
+         * Strip parenthesis...
+         */
 
+         if ((ptr = value + strlen(value) - 1) > value && *ptr == ')')
+           *ptr = '\0';
 
-/*
- * 'cups_dnssd_get_device()' - Lookup a device and create it as needed.
- */
+         strlcpy(model, value + 1, sizeof(model));
+       }
+       else
+         strlcpy(model, value, sizeof(model));
+      }
+      else if (!_cups_strcasecmp(key, "ty"))
+      {
+       strlcpy(model, value, sizeof(model));
 
-static _cups_dnssd_device_t *          /* O - Device */
-cups_dnssd_get_device(
-    _cups_dnssd_data_t *data,          /* I - Enumeration data */
-    const char         *serviceName,   /* I - Service name */
-    const char         *regtype,       /* I - Registration type */
-    const char         *replyDomain)   /* I - Domain name */
-{
-  _cups_dnssd_device_t key,            /* Search key */
-                       *device;        /* Device */
-  char                 fullName[kDNSServiceMaxDomainName],
-                                       /* Full name for query */
-                       name[128];      /* Queue name */
+       if ((ptr = strchr(model, ',')) != NULL)
+         *ptr = '\0';
+      }
+      else if (!_cups_strcasecmp(key, "note"))
+        device->dest.num_options = cupsAddOption("printer-location", value,
+                                                device->dest.num_options,
+                                                &device->dest.options);
+      else if (!_cups_strcasecmp(key, "pdl"))
+      {
+       /*
+        * Look for PDF-capable printers; only PDF-capable printers are shown.
+        */
 
+        const char     *start, *next;  /* Pointer into value */
+        int            have_pdf = 0,   /* Have PDF? */
+                       have_raster = 0;/* Have raster format support? */
 
-  DEBUG_printf(("5cups_dnssd_get_device(data=%p, serviceName=\"%s\", regtype=\"%s\", replyDomain=\"%s\")", (void *)data, serviceName, regtype, replyDomain));
+        for (start = value; start && *start; start = next)
+        {
+          if (!_cups_strncasecmp(start, "application/pdf", 15) && (!start[15] || start[15] == ','))
+          {
+            have_pdf = 1;
+            break;
+          }
+          else if ((!_cups_strncasecmp(start, "image/pwg-raster", 16) && (!start[16] || start[16] == ',')) ||
+                  (!_cups_strncasecmp(start, "image/urf", 9) && (!start[9] || start[9] == ',')))
+          {
+            have_raster = 1;
+            break;
+          }
 
- /*
-  * See if this is an existing device...
-  */
+          if ((next = strchr(start, ',')) != NULL)
+            next ++;
+        }
 
-  cups_queue_name(name, serviceName, sizeof(name));
+        if (!have_pdf && !have_raster)
+          device->state = _CUPS_DNSSD_INCOMPATIBLE;
+      }
+      else if (!_cups_strcasecmp(key, "printer-type"))
+      {
+       /*
+        * Value is either NNNN or 0xXXXX
+        */
 
-  key.dest.name = name;
+       saw_printer_type = 1;
+        type             = (cups_ptype_t)strtol(value, NULL, 0) | CUPS_PRINTER_DISCOVERED;
+      }
+      else if (!saw_printer_type)
+      {
+       if (!_cups_strcasecmp(key, "air") &&
+                !_cups_strcasecmp(value, "t"))
+         type |= CUPS_PRINTER_AUTHENTICATED;
+       else if (!_cups_strcasecmp(key, "bind") &&
+                !_cups_strcasecmp(value, "t"))
+         type |= CUPS_PRINTER_BIND;
+       else if (!_cups_strcasecmp(key, "collate") &&
+                !_cups_strcasecmp(value, "t"))
+         type |= CUPS_PRINTER_COLLATE;
+       else if (!_cups_strcasecmp(key, "color") &&
+                !_cups_strcasecmp(value, "t"))
+         type |= CUPS_PRINTER_COLOR;
+       else if (!_cups_strcasecmp(key, "copies") &&
+                !_cups_strcasecmp(value, "t"))
+         type |= CUPS_PRINTER_COPIES;
+       else if (!_cups_strcasecmp(key, "duplex") &&
+                !_cups_strcasecmp(value, "t"))
+         type |= CUPS_PRINTER_DUPLEX;
+       else if (!_cups_strcasecmp(key, "fax") &&
+                !_cups_strcasecmp(value, "t"))
+         type |= CUPS_PRINTER_MFP;
+       else if (!_cups_strcasecmp(key, "papercustom") &&
+                !_cups_strcasecmp(value, "t"))
+         type |= CUPS_PRINTER_VARIABLE;
+       else if (!_cups_strcasecmp(key, "papermax"))
+       {
+         if (!_cups_strcasecmp(value, "legal-a4"))
+           type |= CUPS_PRINTER_SMALL;
+         else if (!_cups_strcasecmp(value, "isoc-a2"))
+           type |= CUPS_PRINTER_MEDIUM;
+         else if (!_cups_strcasecmp(value, ">isoc-a2"))
+           type |= CUPS_PRINTER_LARGE;
+       }
+       else if (!_cups_strcasecmp(key, "punch") &&
+                !_cups_strcasecmp(value, "t"))
+         type |= CUPS_PRINTER_PUNCH;
+       else if (!_cups_strcasecmp(key, "scan") &&
+                !_cups_strcasecmp(value, "t"))
+         type |= CUPS_PRINTER_MFP;
+       else if (!_cups_strcasecmp(key, "sort") &&
+                !_cups_strcasecmp(value, "t"))
+         type |= CUPS_PRINTER_SORT;
+       else if (!_cups_strcasecmp(key, "staple") &&
+                !_cups_strcasecmp(value, "t"))
+         type |= CUPS_PRINTER_STAPLE;
+      }
+    }
 
-  if ((device = cupsArrayFind(data->devices, &key)) != NULL)
-  {
    /*
-    * Yes, see if we need to do anything with this...
+    * Save the printer-xxx values...
     */
 
-    int        update = 0;                     /* Non-zero if we need to update */
-
-    if (!_cups_strcasecmp(replyDomain, "local.") &&
-       _cups_strcasecmp(device->domain, replyDomain))
+    if (make_and_model[0])
     {
-     /*
-      * Update the "global" listing to use the .local domain name instead.
-      */
-
-      _cupsStrFree(device->domain);
-      device->domain = _cupsStrAlloc(replyDomain);
-
-      DEBUG_printf(("6cups_dnssd_get_device: Updating '%s' to use local "
-                    "domain.", device->dest.name));
+      strlcat(make_and_model, " ", sizeof(make_and_model));
+      strlcat(make_and_model, model, sizeof(make_and_model));
 
-      update = 1;
+      device->dest.num_options = cupsAddOption("printer-make-and-model", make_and_model, device->dest.num_options, &device->dest.options);
     }
+    else
+      device->dest.num_options = cupsAddOption("printer-make-and-model", model, device->dest.num_options, &device->dest.options);
 
-    if (!_cups_strcasecmp(regtype, "_ipps._tcp") &&
-       _cups_strcasecmp(device->regtype, regtype))
-    {
-     /*
-      * Prefer IPPS over IPP.
-      */
+    device->type = type;
+    snprintf(value, sizeof(value), "%u", type);
+    device->dest.num_options = cupsAddOption("printer-type", value, device->dest.num_options, &device->dest.options);
 
-      _cupsStrFree(device->regtype);
-      device->regtype = _cupsStrAlloc(regtype);
+   /*
+    * Save the URI...
+    */
 
-      DEBUG_printf(("6cups_dnssd_get_device: Updating '%s' to use IPPS.",
-                   device->dest.name));
+    cups_dnssd_unquote(uriname, device->fullName, sizeof(uriname));
+    httpAssembleURI(HTTP_URI_CODING_ALL, uri, sizeof(uri),
+                    !strcmp(device->regtype, "_ipps._tcp") ? "ipps" : "ipp",
+                    NULL, uriname, 0, saw_printer_type ? "/cups" : "/");
 
-      update = 1;
-    }
+    DEBUG_printf(("6cups_dnssd_query: device-uri=\"%s\"", uri));
 
-    if (!update)
-    {
-      DEBUG_printf(("6cups_dnssd_get_device: No changes to '%s'.",
-                    device->dest.name));
-      return (device);
-    }
+    device->dest.num_options = cupsAddOption("device-uri", uri, device->dest.num_options, &device->dest.options);
   }
   else
-  {
-   /*
-    * No, add the device...
-    */
+    DEBUG_printf(("6cups_dnssd_query: Ignoring TXT record for '%s'.",
+                  fullName));
+}
 
-    DEBUG_printf(("6cups_dnssd_get_device: Adding '%s' for %s with domain "
-                  "'%s'.", serviceName,
-                  !strcmp(regtype, "_ipps._tcp") ? "IPPS" : "IPP",
-                  replyDomain));
 
-    device            = calloc(sizeof(_cups_dnssd_device_t), 1);
-    device->dest.name = _cupsStrAlloc(name);
-    device->domain    = _cupsStrAlloc(replyDomain);
-    device->regtype   = _cupsStrAlloc(regtype);
+/*
+ * 'cups_dnssd_resolve()' - Resolve a Bonjour printer URI.
+ */
 
-    device->dest.num_options = cupsAddOption("printer-info", serviceName, 0, &device->dest.options);
+static const char *                    /* O - Resolved URI or NULL */
+cups_dnssd_resolve(
+    cups_dest_t    *dest,              /* I - Destination */
+    const char     *uri,               /* I - Current printer URI */
+    int            msec,               /* I - Time in milliseconds */
+    int            *cancel,            /* I - Pointer to "cancel" variable */
+    cups_dest_cb_t cb,                 /* I - Callback */
+    void           *user_data)         /* I - User data for callback */
+{
+  char                 tempuri[1024];  /* Temporary URI buffer */
+  _cups_dnssd_resolve_t        resolve;        /* Resolve data */
 
-    cupsArrayAdd(data->devices, device);
-  }
 
  /*
-  * Set the "full name" of this service, which is used for queries...
+  * Resolve the URI...
   */
 
-#  ifdef HAVE_DNSSD
-  DNSServiceConstructFullName(fullName, serviceName, regtype, replyDomain);
-#  else /* HAVE_AVAHI */
-  avahi_service_name_join(fullName, kDNSServiceMaxDomainName, serviceName, regtype, replyDomain);
-#  endif /* HAVE_DNSSD */
+  resolve.cancel = cancel;
+  gettimeofday(&resolve.end_time, NULL);
+  if (msec > 0)
+  {
+    resolve.end_time.tv_sec  += msec / 1000;
+    resolve.end_time.tv_usec += (msec % 1000) * 1000;
 
-  _cupsStrFree(device->fullName);
-  device->fullName = _cupsStrAlloc(fullName);
+    while (resolve.end_time.tv_usec >= 1000000)
+    {
+      resolve.end_time.tv_sec ++;
+      resolve.end_time.tv_usec -= 1000000;
+    }
+  }
+  else
+    resolve.end_time.tv_sec += 75;
 
-  if (device->ref)
+  if (cb)
+    (*cb)(user_data, CUPS_DEST_FLAGS_UNCONNECTED | CUPS_DEST_FLAGS_RESOLVING, dest);
+
+  if ((uri = _httpResolveURI(uri, tempuri, sizeof(tempuri), _HTTP_RESOLVE_DEFAULT, cups_dnssd_resolve_cb, &resolve)) == NULL)
   {
-#  ifdef HAVE_DNSSD
-    DNSServiceRefDeallocate(device->ref);
-#  else /* HAVE_AVAHI */
-    avahi_record_browser_free(device->ref);
-#  endif /* HAVE_DNSSD */
+    _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("Unable to resolve printer-uri."), 1);
+
+    if (cb)
+      (*cb)(user_data, CUPS_DEST_FLAGS_UNCONNECTED | CUPS_DEST_FLAGS_ERROR, dest);
 
-    device->ref = 0;
+    return (NULL);
   }
 
-  if (device->state == _CUPS_DNSSD_ACTIVE)
-  {
-    DEBUG_printf(("6cups_dnssd_get_device: Remove callback for \"%s\".", device->dest.name));
+ /*
+  * Save the resolved URI...
+  */
 
-    (*data->cb)(data->user_data, CUPS_DEST_FLAGS_REMOVED, &device->dest);
-    device->state = _CUPS_DNSSD_NEW;
-  }
+  dest->num_options = cupsAddOption("device-uri", uri, dest->num_options, &dest->options);
 
-  return (device);
+  return (cupsGetOption("device-uri", dest->num_options, dest->options));
 }
 
 
-#  ifdef HAVE_DNSSD
 /*
- * 'cups_dnssd_local_cb()' - Browse for local printers.
+ * 'cups_dnssd_resolve_cb()' - See if we should continue resolving.
  */
 
-static void
-cups_dnssd_local_cb(
-    DNSServiceRef       sdRef,         /* I - Service reference */
-    DNSServiceFlags     flags,         /* I - Option flags */
-    uint32_t            interfaceIndex,        /* I - Interface number */
-    DNSServiceErrorType errorCode,     /* I - Error, if any */
-    const char          *serviceName,  /* I - Name of service/device */
-    const char          *regtype,      /* I - Type of service */
-    const char          *replyDomain,  /* I - Service domain */
-    void                *context)      /* I - Devices array */
+static int                             /* O - 1 to continue, 0 to stop */
+cups_dnssd_resolve_cb(void *context)   /* I - Resolve data */
 {
-  _cups_dnssd_data_t   *data = (_cups_dnssd_data_t *)context;
-                                       /* Enumeration data */
-  _cups_dnssd_device_t *device;        /* Device */
-
+  _cups_dnssd_resolve_t        *resolve = (_cups_dnssd_resolve_t *)context;
+                                       /* Resolve data */
+  struct timeval       curtime;        /* Current time */
 
-  DEBUG_printf(("5cups_dnssd_local_cb(sdRef=%p, flags=%x, interfaceIndex=%d, errorCode=%d, serviceName=\"%s\", regtype=\"%s\", replyDomain=\"%s\", context=%p)", (void *)sdRef, flags, interfaceIndex, errorCode, serviceName, regtype, replyDomain, context));
 
  /*
-  * Only process "add" data...
+  * If the cancel variable is set, return immediately.
   */
 
-  if (errorCode != kDNSServiceErr_NoError || !(flags & kDNSServiceFlagsAdd))
-    return;
+  if (resolve->cancel && *(resolve->cancel))
+  {
+    DEBUG_puts("4cups_dnssd_resolve_cb: Canceled.");
+    return (0);
+  }
 
  /*
-  * Get the device...
+  * Otherwise check the end time...
   */
 
-  device = cups_dnssd_get_device(data, serviceName, regtype, replyDomain);
+  gettimeofday(&curtime, NULL);
 
- /*
-  * Hide locally-registered devices...
-  */
+  DEBUG_printf(("4cups_dnssd_resolve_cb: curtime=%d.%06d, end_time=%d.%06d", (int)curtime.tv_sec, (int)curtime.tv_usec, (int)resolve->end_time.tv_sec, (int)resolve->end_time.tv_usec));
 
-  DEBUG_printf(("6cups_dnssd_local_cb: Hiding local printer '%s'.",
-                serviceName));
+  return (curtime.tv_sec < resolve->end_time.tv_sec ||
+          (curtime.tv_sec == resolve->end_time.tv_sec &&
+           curtime.tv_usec < resolve->end_time.tv_usec));
+}
 
-  if (device->ref)
-  {
-    DNSServiceRefDeallocate(device->ref);
-    device->ref = 0;
-  }
 
-  if (device->state == _CUPS_DNSSD_ACTIVE)
+/*
+ * 'cups_dnssd_unquote()' - Unquote a name string.
+ */
+
+static void
+cups_dnssd_unquote(char       *dst,    /* I - Destination buffer */
+                   const char *src,    /* I - Source string */
+                  size_t     dstsize)  /* I - Size of destination buffer */
+{
+  char *dstend = dst + dstsize - 1;    /* End of destination buffer */
+
+
+  while (*src && dst < dstend)
   {
-    DEBUG_printf(("6cups_dnssd_local_cb: Remove callback for \"%s\".", device->dest.name));
-    (*data->cb)(data->user_data, CUPS_DEST_FLAGS_REMOVED, &device->dest);
+    if (*src == '\\')
+    {
+      src ++;
+      if (isdigit(src[0] & 255) && isdigit(src[1] & 255) &&
+          isdigit(src[2] & 255))
+      {
+        *dst++ = ((((src[0] - '0') * 10) + src[1] - '0') * 10) + src[2] - '0';
+       src += 3;
+      }
+      else
+        *dst++ = *src++;
+    }
+    else
+      *dst++ = *src ++;
   }
 
-  device->state = _CUPS_DNSSD_LOCAL;
+  *dst = '\0';
 }
-#  endif /* HAVE_DNSSD */
+#endif /* HAVE_DNSSD */
 
 
-#  ifdef HAVE_AVAHI
+#if defined(HAVE_AVAHI) || defined(HAVE_DNSSD)
 /*
- * 'cups_dnssd_poll_cb()' - Wait for input on the specified file descriptors.
- *
- * Note: This function is needed because avahi_simple_poll_iterate is broken
- *       and always uses a timeout of 0 (!) milliseconds.
- *       (https://github.com/lathiat/avahi/issues/127)
- *
- * @private@
+ * 'cups_elapsed()' - Return the elapsed time in milliseconds.
  */
 
-static int                             /* O - Number of file descriptors matching */
-cups_dnssd_poll_cb(
-    struct pollfd *pollfds,            /* I - File descriptors */
-    unsigned int  num_pollfds,         /* I - Number of file descriptors */
-    int           timeout,             /* I - Timeout in milliseconds (unused) */
-    void          *context)            /* I - User data (unused) */
+static int                             /* O  - Elapsed time in milliseconds */
+cups_elapsed(struct timeval *t)                /* IO - Previous time */
 {
-  _cups_dnssd_data_t   *data = (_cups_dnssd_data_t *)context;
-                                       /* Enumeration data */
-  int                  val;            /* Return value */
-
-
-  DEBUG_printf(("cups_dnssd_poll_cb(pollfds=%p, num_pollfds=%d, timeout=%d, context=%p)", pollfds, num_pollfds, timeout, context));
+  int                  msecs;          /* Milliseconds */
+  struct timeval       nt;             /* New time */
 
-  (void)timeout;
 
-  val = poll(pollfds, num_pollfds, _CUPS_DNSSD_MAXTIME);
+  gettimeofday(&nt, NULL);
 
-  DEBUG_printf(("cups_dnssd_poll_cb: poll() returned %d", val));
+  msecs = (int)(1000 * (nt.tv_sec - t->tv_sec) + (nt.tv_usec - t->tv_usec) / 1000);
 
-  if (val < 0)
-  {
-    DEBUG_printf(("cups_dnssd_poll_cb: %s", strerror(errno)));
-  }
-  else if (val > 0)
-  {
-    data->got_data = 1;
-  }
+  *t = nt;
 
-  return (val);
+  return (msecs);
 }
-#  endif /* HAVE_AVAHI */
+#endif /* HAVE_AVAHI || HAVE_DNSSD */
 
 
 /*
- * 'cups_dnssd_query_cb()' - Process query data.
+ * 'cups_enum_dests()' - Enumerate destinations from a specific server.
  */
 
-#  ifdef HAVE_DNSSD
-static void
-cups_dnssd_query_cb(
-    DNSServiceRef       sdRef,         /* I - Service reference */
-    DNSServiceFlags     flags,         /* I - Data flags */
-    uint32_t            interfaceIndex,        /* I - Interface */
-    DNSServiceErrorType errorCode,     /* I - Error, if any */
-    const char          *fullName,     /* I - Full service name */
-    uint16_t            rrtype,                /* I - Record type */
-    uint16_t            rrclass,       /* I - Record class */
-    uint16_t            rdlen,         /* I - Length of record data */
-    const void          *rdata,                /* I - Record data */
-    uint32_t            ttl,           /* I - Time-to-live */
-    void                *context)      /* I - Enumeration data */
+static int                              /* O - 1 on success, 0 on failure */
+cups_enum_dests(
+  http_t         *http,                 /* I - Connection to scheduler */
+  unsigned       flags,                 /* I - Enumeration flags */
+  int            msec,                  /* I - Timeout in milliseconds, -1 for indefinite */
+  int            *cancel,               /* I - Pointer to "cancel" variable */
+  cups_ptype_t   type,                  /* I - Printer type bits */
+  cups_ptype_t   mask,                  /* I - Mask for printer type bits */
+  cups_dest_cb_t cb,                    /* I - Callback function */
+  void           *user_data)            /* I - User data */
 {
+  int           i,                      /* Looping var */
+                num_dests;              /* Number of destinations */
+  cups_dest_t   *dests = NULL,          /* Destinations */
+                *dest;                  /* Current destination */
+  const char    *defprinter;            /* Default printer */
+  char          name[1024],             /* Copy of printer name */
+                *instance,              /* Pointer to instance name */
+                *user_default;          /* User default printer */
+#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
+  int           count,                  /* Number of queries started */
+                completed,              /* Number of completed queries */
+                remaining;              /* Remainder of timeout */
+  struct timeval curtime;               /* Current time */
+  _cups_dnssd_data_t data;              /* Data for callback */
+  _cups_dnssd_device_t *device;         /* Current device */
+#  ifdef HAVE_DNSSD
+  int           nfds,                   /* Number of files responded */
+                main_fd;                /* File descriptor for lookups */
+  DNSServiceRef ipp_ref = NULL,         /* IPP browser */
+                local_ipp_ref = NULL;   /* Local IPP browser */
+#    ifdef HAVE_SSL
+  DNSServiceRef ipps_ref = NULL,        /* IPPS browser */
+                local_ipps_ref = NULL;  /* Local IPPS browser */
+#    endif /* HAVE_SSL */
+#    ifdef HAVE_POLL
+  struct pollfd pfd;                    /* Polling data */
+#    else
+  fd_set        input;                  /* Input set for select() */
+  struct timeval timeout;               /* Timeout for select() */
+#    endif /* HAVE_POLL */
 #  else /* HAVE_AVAHI */
-static void
-cups_dnssd_query_cb(
-    AvahiRecordBrowser     *browser,   /* I - Record browser */
-    AvahiIfIndex           interfaceIndex,
-                                       /* I - Interface index (unused) */
-    AvahiProtocol          protocol,   /* I - Network protocol (unused) */
-    AvahiBrowserEvent      event,      /* I - What happened? */
-    const char             *fullName,  /* I - Service name */
-    uint16_t               rrclass,    /* I - Record class */
-    uint16_t               rrtype,     /* I - Record type */
-    const void             *rdata,     /* I - TXT record */
-    size_t                 rdlen,      /* I - Length of TXT record */
-    AvahiLookupResultFlags flags,      /* I - Flags */
-    void                   *context)   /* I - Enumeration data */
-{
-#    ifdef DEBUG
-  AvahiClient          *client = avahi_record_browser_get_client(browser);
-                                       /* Client information */
-#    endif /* DEBUG */
+  int           error;                  /* Error value */
+  AvahiServiceBrowser *ipp_ref = NULL;  /* IPP browser */
+#    ifdef HAVE_SSL
+  AvahiServiceBrowser *ipps_ref = NULL; /* IPPS browser */
+#    endif /* HAVE_SSL */
 #  endif /* HAVE_DNSSD */
-  _cups_dnssd_data_t   *data = (_cups_dnssd_data_t *)context;
-                                       /* Enumeration data */
-  char                 serviceName[256],/* Service name */
-                       name[128],      /* Queue name */
-                       *ptr;           /* Pointer into string */
-  _cups_dnssd_device_t dkey,           /* Search key */
-                       *device;        /* Device */
+#endif /* HAVE_DNSSD || HAVE_AVAHI */
 
 
-#  ifdef HAVE_DNSSD
-  DEBUG_printf(("5cups_dnssd_query_cb(sdRef=%p, flags=%x, interfaceIndex=%d, errorCode=%d, fullName=\"%s\", rrtype=%u, rrclass=%u, rdlen=%u, rdata=%p, ttl=%u, context=%p)", (void *)sdRef, flags, interfaceIndex, errorCode, fullName, rrtype, rrclass, rdlen, rdata, ttl, context));
+  DEBUG_printf(("cups_enum_dests(flags=%x, msec=%d, cancel=%p, type=%x, mask=%x, cb=%p, user_data=%p)", flags, msec, (void *)cancel, type, mask, (void *)cb, (void *)user_data));
 
  /*
-  * Only process "add" data...
+  * Range check input...
   */
 
-  if (errorCode != kDNSServiceErr_NoError || !(flags & kDNSServiceFlagsAdd))
-    return;
-
-#  else /* HAVE_AVAHI */
-  DEBUG_printf(("cups_dnssd_query_cb(browser=%p, interfaceIndex=%d, protocol=%d, event=%d, fullName=\"%s\", rrclass=%u, rrtype=%u, rdata=%p, rdlen=%u, flags=%x, context=%p)", browser, interfaceIndex, protocol, event, fullName, rrclass, rrtype, rdata, (unsigned)rdlen, flags, context));
-
- /*
-  * Only process "add" data...
-  */
+  (void)flags;
 
-  if (event != AVAHI_BROWSER_NEW)
+  if (!cb)
   {
-    if (event == AVAHI_BROWSER_FAILURE)
-      DEBUG_printf(("cups_dnssd_query_cb: %s", avahi_strerror(avahi_client_errno(client))));
-
-    return;
+    DEBUG_puts("1cups_enum_dests: No callback, returning 0.");
+    return (0);
   }
-#  endif /* HAVE_DNSSD */
 
  /*
-  * Lookup the service in the devices array.
+  * Get ready to enumerate...
   */
 
-  cups_dnssd_unquote(serviceName, fullName, sizeof(serviceName));
-
-  if ((ptr = strstr(serviceName, "._")) != NULL)
-    *ptr = '\0';
-
-  cups_queue_name(name, serviceName, sizeof(name));
+#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
+  memset(&data, 0, sizeof(data));
 
-  dkey.dest.name = name;
+  data.type      = type;
+  data.mask      = mask;
+  data.cb        = cb;
+  data.user_data = user_data;
+  data.devices   = cupsArrayNew3((cups_array_func_t)cups_dnssd_compare_devices, NULL, NULL, 0, NULL, (cups_afree_func_t)cups_dnssd_free_device);
+#endif /* HAVE_DNSSD || HAVE_AVAHI */
 
-  if ((device = cupsArrayFind(data->devices, &dkey)) != NULL && device->state == _CUPS_DNSSD_NEW)
+  if (!(mask & CUPS_PRINTER_DISCOVERED) || !(type & CUPS_PRINTER_DISCOVERED))
   {
    /*
-    * Found it, pull out the make and model from the TXT record and save it...
-    */
-
-    const uint8_t      *txt,           /* Pointer into data */
-                       *txtnext,       /* Next key/value pair */
-                       *txtend;        /* End of entire TXT record */
-    uint8_t            txtlen;         /* Length of current key/value pair */
-    char               key[256],       /* Key string */
-                       value[256],     /* Value string */
-                       make_and_model[512],
-                                       /* Manufacturer and model */
-                       model[256],     /* Model */
-                       uriname[1024],  /* Name for URI */
-                       uri[1024];      /* Printer URI */
-    cups_ptype_t       type = CUPS_PRINTER_DISCOVERED | CUPS_PRINTER_BW;
-                                       /* Printer type */
-    int                        saw_printer_type = 0;
-                                       /* Did we see a printer-type key? */
+    * Get the list of local printers and pass them to the callback function...
+    */
 
-    device->state     = _CUPS_DNSSD_PENDING;
-    make_and_model[0] = '\0';
+    num_dests = _cupsGetDests(http, IPP_OP_CUPS_GET_PRINTERS, NULL, &dests, type, mask);
 
-    strlcpy(model, "Unknown", sizeof(model));
+    if ((user_default = _cupsUserDefault(name, sizeof(name))) != NULL)
+      defprinter = name;
+    else if ((defprinter = cupsGetDefault2(http)) != NULL)
+    {
+      strlcpy(name, defprinter, sizeof(name));
+      defprinter = name;
+    }
 
-    for (txt = rdata, txtend = txt + rdlen;
-        txt < txtend;
-        txt = txtnext)
+    if (defprinter)
     {
      /*
-      * Read a key/value pair starting with an 8-bit length.  Since the
-      * length is 8 bits and the size of the key/value buffers is 256, we
-      * don't need to check for overflow...
+      * Separate printer and instance name...
       */
 
-      txtlen = *txt++;
-
-      if (!txtlen || (txt + txtlen) > txtend)
-       break;
-
-      txtnext = txt + txtlen;
-
-      for (ptr = key; txt < txtnext && *txt != '='; txt ++)
-       *ptr++ = (char)*txt;
-      *ptr = '\0';
-
-      if (txt < txtnext && *txt == '=')
-      {
-       txt ++;
-
-       if (txt < txtnext)
-         memcpy(value, txt, (size_t)(txtnext - txt));
-       value[txtnext - txt] = '\0';
+      if ((instance = strchr(name, '/')) != NULL)
+        *instance++ = '\0';
 
-       DEBUG_printf(("6cups_dnssd_query_cb: %s=%s", key, value));
-      }
-      else
-      {
-       DEBUG_printf(("6cups_dnssd_query_cb: '%s' with no value.", key));
-       continue;
-      }
+     /*
+      * Lookup the printer and instance and make it the default...
+      */
 
-      if (!_cups_strcasecmp(key, "usb_MFG") ||
-          !_cups_strcasecmp(key, "usb_MANU") ||
-         !_cups_strcasecmp(key, "usb_MANUFACTURER"))
-       strlcpy(make_and_model, value, sizeof(make_and_model));
-      else if (!_cups_strcasecmp(key, "usb_MDL") ||
-               !_cups_strcasecmp(key, "usb_MODEL"))
-       strlcpy(model, value, sizeof(model));
-      else if (!_cups_strcasecmp(key, "product") && !strstr(value, "Ghostscript"))
-      {
-       if (value[0] == '(')
-       {
-        /*
-         * Strip parenthesis...
-         */
+      if ((dest = cupsGetDest(name, instance, num_dests, dests)) != NULL)
+        dest->is_default = 1;
+    }
 
-         if ((ptr = value + strlen(value) - 1) > value && *ptr == ')')
-           *ptr = '\0';
+    for (i = num_dests, dest = dests;
+         i > 0 && (!cancel || !*cancel);
+         i --, dest ++)
+    {
+#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
+      const char *device_uri;    /* Device URI */
+#endif /* HAVE_DNSSD || HAVE_AVAHI */
 
-         strlcpy(model, value + 1, sizeof(model));
-       }
-       else
-         strlcpy(model, value, sizeof(model));
-      }
-      else if (!_cups_strcasecmp(key, "ty"))
-      {
-       strlcpy(model, value, sizeof(model));
+      if (!(*cb)(user_data, i > 1 ? CUPS_DEST_FLAGS_MORE : CUPS_DEST_FLAGS_NONE, dest))
+        break;
 
-       if ((ptr = strchr(model, ',')) != NULL)
-         *ptr = '\0';
-      }
-      else if (!_cups_strcasecmp(key, "note"))
-        device->dest.num_options = cupsAddOption("printer-location", value,
-                                                device->dest.num_options,
-                                                &device->dest.options);
-      else if (!_cups_strcasecmp(key, "pdl"))
+#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
+      if (!dest->instance && (device_uri = cupsGetOption("device-uri", dest->num_options, dest->options)) != NULL && !strncmp(device_uri, "dnssd://", 8))
       {
        /*
-        * Look for PDF-capable printers; only PDF-capable printers are shown.
+        * Add existing queue using service name, etc. so we don't list it again...
         */
 
-        const char     *start, *next;  /* Pointer into value */
-        int            have_pdf = 0,   /* Have PDF? */
-                       have_raster = 0;/* Have raster format support? */
+        char    scheme[32],             /* URI scheme */
+                userpass[32],           /* Username:password */
+                serviceName[256],       /* Service name (host field) */
+                resource[256],          /* Resource (options) */
+                *regtype,               /* Registration type */
+                *replyDomain;           /* Registration domain */
+        int     port;                   /* Port number (not used) */
 
-        for (start = value; start && *start; start = next)
+        if (httpSeparateURI(HTTP_URI_CODING_ALL, device_uri, scheme, sizeof(scheme), userpass, sizeof(userpass), serviceName, sizeof(serviceName), &port, resource, sizeof(resource)) >= HTTP_URI_STATUS_OK)
         {
-          if (!_cups_strncasecmp(start, "application/pdf", 15) && (!start[15] || start[15] == ','))
-          {
-            have_pdf = 1;
-            break;
-          }
-          else if ((!_cups_strncasecmp(start, "image/pwg-raster", 16) && (!start[16] || start[16] == ',')) ||
-                  (!_cups_strncasecmp(start, "image/urf", 9) && (!start[9] || start[9] == ',')))
+          if ((regtype = strstr(serviceName, "._ipp")) != NULL)
           {
-            have_raster = 1;
-            break;
-          }
-
-          if ((next = strchr(start, ',')) != NULL)
-            next ++;
-        }
+            *regtype++ = '\0';
 
-        if (!have_pdf && !have_raster)
-          device->state = _CUPS_DNSSD_INCOMPATIBLE;
-      }
-      else if (!_cups_strcasecmp(key, "printer-type"))
-      {
-       /*
-        * Value is either NNNN or 0xXXXX
-        */
+            if ((replyDomain = strstr(regtype, "._tcp.")) != NULL)
+            {
+              replyDomain[5] = '\0';
+              replyDomain += 6;
 
-       saw_printer_type = 1;
-        type             = (cups_ptype_t)strtol(value, NULL, 0) | CUPS_PRINTER_DISCOVERED;
-      }
-      else if (!saw_printer_type)
-      {
-       if (!_cups_strcasecmp(key, "air") &&
-                !_cups_strcasecmp(value, "t"))
-         type |= CUPS_PRINTER_AUTHENTICATED;
-       else if (!_cups_strcasecmp(key, "bind") &&
-                !_cups_strcasecmp(value, "t"))
-         type |= CUPS_PRINTER_BIND;
-       else if (!_cups_strcasecmp(key, "collate") &&
-                !_cups_strcasecmp(value, "t"))
-         type |= CUPS_PRINTER_COLLATE;
-       else if (!_cups_strcasecmp(key, "color") &&
-                !_cups_strcasecmp(value, "t"))
-         type |= CUPS_PRINTER_COLOR;
-       else if (!_cups_strcasecmp(key, "copies") &&
-                !_cups_strcasecmp(value, "t"))
-         type |= CUPS_PRINTER_COPIES;
-       else if (!_cups_strcasecmp(key, "duplex") &&
-                !_cups_strcasecmp(value, "t"))
-         type |= CUPS_PRINTER_DUPLEX;
-       else if (!_cups_strcasecmp(key, "fax") &&
-                !_cups_strcasecmp(value, "t"))
-         type |= CUPS_PRINTER_MFP;
-       else if (!_cups_strcasecmp(key, "papercustom") &&
-                !_cups_strcasecmp(value, "t"))
-         type |= CUPS_PRINTER_VARIABLE;
-       else if (!_cups_strcasecmp(key, "papermax"))
-       {
-         if (!_cups_strcasecmp(value, "legal-a4"))
-           type |= CUPS_PRINTER_SMALL;
-         else if (!_cups_strcasecmp(value, "isoc-a2"))
-           type |= CUPS_PRINTER_MEDIUM;
-         else if (!_cups_strcasecmp(value, ">isoc-a2"))
-           type |= CUPS_PRINTER_LARGE;
-       }
-       else if (!_cups_strcasecmp(key, "punch") &&
-                !_cups_strcasecmp(value, "t"))
-         type |= CUPS_PRINTER_PUNCH;
-       else if (!_cups_strcasecmp(key, "scan") &&
-                !_cups_strcasecmp(value, "t"))
-         type |= CUPS_PRINTER_MFP;
-       else if (!_cups_strcasecmp(key, "sort") &&
-                !_cups_strcasecmp(value, "t"))
-         type |= CUPS_PRINTER_SORT;
-       else if (!_cups_strcasecmp(key, "staple") &&
-                !_cups_strcasecmp(value, "t"))
-         type |= CUPS_PRINTER_STAPLE;
+              if ((device = cups_dnssd_get_device(&data, serviceName, regtype, replyDomain)) != NULL)
+                device->state = _CUPS_DNSSD_ACTIVE;
+            }
+          }
+        }
       }
+#endif /* HAVE_DNSSD || HAVE_AVAHI */
     }
 
-   /*
-    * Save the printer-xxx values...
-    */
+    cupsFreeDests(num_dests, dests);
 
-    if (make_and_model[0])
-    {
-      strlcat(make_and_model, " ", sizeof(make_and_model));
-      strlcat(make_and_model, model, sizeof(make_and_model));
+    if (i > 0 || msec == 0)
+      goto enum_finished;
+  }
 
-      device->dest.num_options = cupsAddOption("printer-make-and-model", make_and_model, device->dest.num_options, &device->dest.options);
-    }
-    else
-      device->dest.num_options = cupsAddOption("printer-make-and-model", model, device->dest.num_options, &device->dest.options);
+ /*
+  * Return early if the caller doesn't want to do discovery...
+  */
 
-    device->type = type;
-    snprintf(value, sizeof(value), "%u", type);
-    device->dest.num_options = cupsAddOption("printer-type", value, device->dest.num_options, &device->dest.options);
+  if ((mask & CUPS_PRINTER_DISCOVERED) && !(type & CUPS_PRINTER_DISCOVERED))
+    goto enum_finished;
 
-   /*
-    * Save the URI...
-    */
+#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
+ /*
+  * Get Bonjour-shared printers...
+  */
 
-    cups_dnssd_unquote(uriname, device->fullName, sizeof(uriname));
-    httpAssembleURI(HTTP_URI_CODING_ALL, uri, sizeof(uri),
-                    !strcmp(device->regtype, "_ipps._tcp") ? "ipps" : "ipp",
-                    NULL, uriname, 0, saw_printer_type ? "/cups" : "/");
+  gettimeofday(&curtime, NULL);
 
-    DEBUG_printf(("6cups_dnssd_query: device-uri=\"%s\"", uri));
+#  ifdef HAVE_DNSSD
+  if (DNSServiceCreateConnection(&data.main_ref) != kDNSServiceErr_NoError)
+  {
+    DEBUG_puts("1cups_enum_dests: Unable to create service browser, returning 0.");
+    return (0);
+  }
 
-    device->dest.num_options = cupsAddOption("device-uri", uri, device->dest.num_options, &device->dest.options);
+  main_fd = DNSServiceRefSockFD(data.main_ref);
+
+  ipp_ref = data.main_ref;
+  if (DNSServiceBrowse(&ipp_ref, kDNSServiceFlagsShareConnection, 0, "_ipp._tcp", NULL, (DNSServiceBrowseReply)cups_dnssd_browse_cb, &data) != kDNSServiceErr_NoError)
+  {
+    DEBUG_puts("1cups_enum_dests: Unable to create IPP browser, returning 0.");
+    DNSServiceRefDeallocate(data.main_ref);
+    return (0);
   }
-  else
-    DEBUG_printf(("6cups_dnssd_query: Ignoring TXT record for '%s'.",
-                  fullName));
-}
 
+  local_ipp_ref = data.main_ref;
+  if (DNSServiceBrowse(&local_ipp_ref, kDNSServiceFlagsShareConnection, kDNSServiceInterfaceIndexLocalOnly, "_ipp._tcp", NULL, (DNSServiceBrowseReply)cups_dnssd_local_cb, &data) != kDNSServiceErr_NoError)
+  {
+    DEBUG_puts("1cups_enum_dests: Unable to create local IPP browser, returning 0.");
+    DNSServiceRefDeallocate(data.main_ref);
+    return (0);
+  }
+
+#    ifdef HAVE_SSL
+  ipps_ref = data.main_ref;
+  if (DNSServiceBrowse(&ipps_ref, kDNSServiceFlagsShareConnection, 0, "_ipps._tcp", NULL, (DNSServiceBrowseReply)cups_dnssd_browse_cb, &data) != kDNSServiceErr_NoError)
+  {
+    DEBUG_puts("1cups_enum_dests: Unable to create IPPS browser, returning 0.");
+    DNSServiceRefDeallocate(data.main_ref);
+    return (0);
+  }
+
+  local_ipps_ref = data.main_ref;
+  if (DNSServiceBrowse(&local_ipps_ref, kDNSServiceFlagsShareConnection, kDNSServiceInterfaceIndexLocalOnly, "_ipps._tcp", NULL, (DNSServiceBrowseReply)cups_dnssd_local_cb, &data) != kDNSServiceErr_NoError)
+  {
+    DEBUG_puts("1cups_enum_dests: Unable to create local IPPS browser, returning 0.");
+    DNSServiceRefDeallocate(data.main_ref);
+    return (0);
+  }
+#    endif /* HAVE_SSL */
+
+#  else /* HAVE_AVAHI */
+  if ((data.simple_poll = avahi_simple_poll_new()) == NULL)
+  {
+    DEBUG_puts("1cups_enum_dests: Unable to create Avahi poll, returning 0.");
+    return (0);
+  }
 
-/*
- * 'cups_dnssd_resolve()' - Resolve a Bonjour printer URI.
- */
+  avahi_simple_poll_set_func(data.simple_poll, cups_dnssd_poll_cb, &data);
 
-static const char *                    /* O - Resolved URI or NULL */
-cups_dnssd_resolve(
-    cups_dest_t    *dest,              /* I - Destination */
-    const char     *uri,               /* I - Current printer URI */
-    int            msec,               /* I - Time in milliseconds */
-    int            *cancel,            /* I - Pointer to "cancel" variable */
-    cups_dest_cb_t cb,                 /* I - Callback */
-    void           *user_data)         /* I - User data for callback */
-{
-  char                 tempuri[1024];  /* Temporary URI buffer */
-  _cups_dnssd_resolve_t        resolve;        /* Resolve data */
+  data.client = avahi_client_new(avahi_simple_poll_get(data.simple_poll),
+         0, cups_dnssd_client_cb, &data,
+         &error);
+  if (!data.client)
+  {
+    DEBUG_puts("1cups_enum_dests: Unable to create Avahi client, returning 0.");
+    avahi_simple_poll_free(data.simple_poll);
+    return (0);
+  }
 
+  data.browsers = 1;
+  if ((ipp_ref = avahi_service_browser_new(data.client, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, "_ipp._tcp", NULL, 0, cups_dnssd_browse_cb, &data)) == NULL)
+  {
+    DEBUG_puts("1cups_enum_dests: Unable to create Avahi IPP browser, returning 0.");
 
- /*
-  * Resolve the URI...
-  */
+    avahi_client_free(data.client);
+    avahi_simple_poll_free(data.simple_poll);
+    return (0);
+  }
 
-  resolve.cancel = cancel;
-  gettimeofday(&resolve.end_time, NULL);
-  if (msec > 0)
+#    ifdef HAVE_SSL
+  data.browsers ++;
+  if ((ipps_ref = avahi_service_browser_new(data.client, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, "_ipps._tcp", NULL, 0, cups_dnssd_browse_cb, &data)) == NULL)
   {
-    resolve.end_time.tv_sec  += msec / 1000;
-    resolve.end_time.tv_usec += (msec % 1000) * 1000;
+    DEBUG_puts("1cups_enum_dests: Unable to create Avahi IPPS browser, returning 0.");
 
-    while (resolve.end_time.tv_usec >= 1000000)
-    {
-      resolve.end_time.tv_sec ++;
-      resolve.end_time.tv_usec -= 1000000;
-    }
+    avahi_service_browser_free(ipp_ref);
+    avahi_client_free(data.client);
+    avahi_simple_poll_free(data.simple_poll);
+    return (0);
   }
-  else
-    resolve.end_time.tv_sec += 75;
+#    endif /* HAVE_SSL */
+#  endif /* HAVE_DNSSD */
 
-  if (cb)
-    (*cb)(user_data, CUPS_DEST_FLAGS_UNCONNECTED | CUPS_DEST_FLAGS_RESOLVING, dest);
+  if (msec < 0)
+    remaining = INT_MAX;
+  else
+    remaining = msec;
 
-  if ((uri = _httpResolveURI(uri, tempuri, sizeof(tempuri), _HTTP_RESOLVE_DEFAULT, cups_dnssd_resolve_cb, &resolve)) == NULL)
+  while (remaining > 0 && (!cancel || !*cancel))
   {
-    _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("Unable to resolve printer-uri."), 1);
+   /*
+    * Check for input...
+    */
 
-    if (cb)
-      (*cb)(user_data, CUPS_DEST_FLAGS_UNCONNECTED | CUPS_DEST_FLAGS_ERROR, dest);
+    DEBUG_printf(("1cups_enum_dests: remaining=%d", remaining));
 
-    return (NULL);
-  }
+    cups_elapsed(&curtime);
 
- /*
-  * Save the resolved URI...
-  */
+#  ifdef HAVE_DNSSD
+#    ifdef HAVE_POLL
+    pfd.fd     = main_fd;
+    pfd.events = POLLIN;
 
-  dest->num_options = cupsAddOption("device-uri", uri, dest->num_options, &dest->options);
+    nfds = poll(&pfd, 1, remaining > _CUPS_DNSSD_MAXTIME ? _CUPS_DNSSD_MAXTIME : remaining);
 
-  return (cupsGetOption("device-uri", dest->num_options, dest->options));
-}
+#    else
+    FD_ZERO(&input);
+    FD_SET(main_fd, &input);
 
+    timeout.tv_sec  = 0;
+    timeout.tv_usec = 1000 * (remaining > _CUPS_DNSSD_MAXTIME ? _CUPS_DNSSD_MAXTIME : remaining);
 
-/*
- * 'cups_dnssd_resolve_cb()' - See if we should continue resolving.
- */
+    nfds = select(main_fd + 1, &input, NULL, NULL, &timeout);
+#    endif /* HAVE_POLL */
 
-static int                             /* O - 1 to continue, 0 to stop */
-cups_dnssd_resolve_cb(void *context)   /* I - Resolve data */
-{
-  _cups_dnssd_resolve_t        *resolve = (_cups_dnssd_resolve_t *)context;
-                                       /* Resolve data */
-  struct timeval       curtime;        /* Current time */
+    if (nfds > 0)
+      DNSServiceProcessResult(data.main_ref);
+    else if (nfds < 0 && errno != EINTR && errno != EAGAIN)
+      break;
 
+#  else /* HAVE_AVAHI */
+    data.got_data = 0;
 
- /*
-  * If the cancel variable is set, return immediately.
-  */
+    if ((error = avahi_simple_poll_iterate(data.simple_poll, _CUPS_DNSSD_MAXTIME)) > 0)
+    {
+     /*
+      * We've been told to exit the loop.  Perhaps the connection to
+      * Avahi failed.
+      */
 
-  if (resolve->cancel && *(resolve->cancel))
-  {
-    DEBUG_puts("4cups_dnssd_resolve_cb: Canceled.");
-    return (0);
-  }
+      break;
+    }
 
- /*
-  * Otherwise check the end time...
-  */
+    DEBUG_printf(("1cups_enum_dests: got_data=%d", data.got_data));
+#  endif /* HAVE_DNSSD */
 
-  gettimeofday(&curtime, NULL);
+    remaining -= cups_elapsed(&curtime);
 
-  DEBUG_printf(("4cups_dnssd_resolve_cb: curtime=%d.%06d, end_time=%d.%06d", (int)curtime.tv_sec, (int)curtime.tv_usec, (int)resolve->end_time.tv_sec, (int)resolve->end_time.tv_usec));
+    for (device = (_cups_dnssd_device_t *)cupsArrayFirst(data.devices),
+             count = 0, completed = 0;
+         device;
+         device = (_cups_dnssd_device_t *)cupsArrayNext(data.devices))
+    {
+      if (device->ref)
+        count ++;
 
-  return (curtime.tv_sec < resolve->end_time.tv_sec ||
-          (curtime.tv_sec == resolve->end_time.tv_sec &&
-           curtime.tv_usec < resolve->end_time.tv_usec));
-}
+      if (device->state == _CUPS_DNSSD_ACTIVE)
+        completed ++;
 
+      if (!device->ref && device->state == _CUPS_DNSSD_NEW)
+      {
+        DEBUG_printf(("1cups_enum_dests: Querying '%s'.", device->fullName));
 
-/*
- * 'cups_dnssd_unquote()' - Unquote a name string.
- */
+#  ifdef HAVE_DNSSD
+        device->ref = data.main_ref;
 
-static void
-cups_dnssd_unquote(char       *dst,    /* I - Destination buffer */
-                   const char *src,    /* I - Source string */
-                  size_t     dstsize)  /* I - Size of destination buffer */
-{
-  char *dstend = dst + dstsize - 1;    /* End of destination buffer */
+        if (DNSServiceQueryRecord(&(device->ref), kDNSServiceFlagsShareConnection, 0, device->fullName, kDNSServiceType_TXT, kDNSServiceClass_IN, (DNSServiceQueryRecordReply)cups_dnssd_query_cb, &data) == kDNSServiceErr_NoError)
+        {
+          count ++;
+        }
+        else
+        {
+          device->ref   = 0;
+          device->state = _CUPS_DNSSD_ERROR;
 
+          DEBUG_puts("1cups_enum_dests: Query failed.");
+        }
 
-  while (*src && dst < dstend)
-  {
-    if (*src == '\\')
-    {
-      src ++;
-      if (isdigit(src[0] & 255) && isdigit(src[1] & 255) &&
-          isdigit(src[2] & 255))
+#  else /* HAVE_AVAHI */
+        if ((device->ref = avahi_record_browser_new(data.client, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, device->fullName, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_TXT, 0, cups_dnssd_query_cb, &data)) != NULL)
+        {
+          DEBUG_printf(("1cups_enum_dests: Query ref=%p", device->ref));
+          count ++;
+        }
+        else
+        {
+          device->state = _CUPS_DNSSD_ERROR;
+
+          DEBUG_printf(("1cups_enum_dests: Query failed: %s", avahi_strerror(avahi_client_errno(data.client))));
+        }
+#  endif /* HAVE_DNSSD */
+      }
+      else if (device->ref && device->state == _CUPS_DNSSD_PENDING)
       {
-        *dst++ = ((((src[0] - '0') * 10) + src[1] - '0') * 10) + src[2] - '0';
-       src += 3;
+        completed ++;
+
+        DEBUG_printf(("1cups_enum_dests: Query for \"%s\" is complete.", device->fullName));
+
+        if ((device->type & mask) == type)
+        {
+          DEBUG_printf(("1cups_enum_dests: Add callback for \"%s\".", device->dest.name));
+          if (!(*cb)(user_data, CUPS_DEST_FLAGS_NONE, &device->dest))
+          {
+            remaining = -1;
+            break;
+          }
+        }
+
+        device->state = _CUPS_DNSSD_ACTIVE;
       }
-      else
-        *dst++ = *src++;
     }
-    else
-      *dst++ = *src ++;
+
+#  ifdef HAVE_AVAHI
+    DEBUG_printf(("1cups_enum_dests: remaining=%d, browsers=%d, completed=%d, count=%d, devices count=%d", remaining, data.browsers, completed, count, cupsArrayCount(data.devices)));
+
+    if (data.browsers == 0 && completed == cupsArrayCount(data.devices))
+      break;
+#  else
+    DEBUG_printf(("1cups_enum_dests: remaining=%d, completed=%d, count=%d, devices count=%d", remaining, completed, count, cupsArrayCount(data.devices)));
+
+    if (completed == cupsArrayCount(data.devices))
+      break;
+#  endif /* HAVE_AVAHI */
   }
+#endif /* HAVE_DNSSD || HAVE_AVAHI */
 
-  *dst = '\0';
-}
-#endif /* HAVE_DNSSD */
+ /*
+  * Return...
+  */
 
+  enum_finished:
 
-#if defined(HAVE_AVAHI) || defined(HAVE_DNSSD)
-/*
- * 'cups_elapsed()' - Return the elapsed time in milliseconds.
- */
+#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
+  cupsArrayDelete(data.devices);
 
-static int                             /* O  - Elapsed time in milliseconds */
-cups_elapsed(struct timeval *t)                /* IO - Previous time */
-{
-  int                  msecs;          /* Milliseconds */
-  struct timeval       nt;             /* New time */
+#  ifdef HAVE_DNSSD
+  if (ipp_ref)
+    DNSServiceRefDeallocate(ipp_ref);
+  if (local_ipp_ref)
+    DNSServiceRefDeallocate(local_ipp_ref);
 
+#    ifdef HAVE_SSL
+  if (ipps_ref)
+    DNSServiceRefDeallocate(ipps_ref);
+  if (local_ipps_ref)
+    DNSServiceRefDeallocate(local_ipps_ref);
+#    endif /* HAVE_SSL */
 
-  gettimeofday(&nt, NULL);
+  if (data.main_ref)
+    DNSServiceRefDeallocate(data.main_ref);
 
-  msecs = (int)(1000 * (nt.tv_sec - t->tv_sec) + (nt.tv_usec - t->tv_usec) / 1000);
+#  else /* HAVE_AVAHI */
+  if (ipp_ref)
+    avahi_service_browser_free(ipp_ref);
+#    ifdef HAVE_SSL
+  if (ipps_ref)
+    avahi_service_browser_free(ipps_ref);
+#    endif /* HAVE_SSL */
 
-  *t = nt;
+  if (data.client)
+    avahi_client_free(data.client);
+  if (data.simple_poll)
+    avahi_simple_poll_free(data.simple_poll);
+#  endif /* HAVE_DNSSD */
+#endif /* HAVE_DNSSD || HAVE_AVAHI */
 
-  return (msecs);
+  DEBUG_puts("1cups_enum_dests: Returning 1.");
+
+  return (1);
 }
-#endif /* HAVE_AVAHI || HAVE_DNSSD */
 
 
 /*