]> git.ipfire.org Git - thirdparty/cups.git/blobdiff - cups/dest.c
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[thirdparty/cups.git] / cups / dest.c
index bf9a0dcc46b35c0a70d724c32045e53f32093d8a..0be2bbeb504beed5ac68d1f384d9899eda86a84f 100644 (file)
@@ -1,81 +1,16 @@
 /*
- * "$Id: dest.c 9568 2011-02-25 06:13:56Z mike $"
+ * User-defined destination (and option) support for CUPS.
  *
- *   User-defined destination (and option) support for CUPS.
+ * Copyright 2007-2017 by Apple Inc.
+ * Copyright 1997-2007 by Easy Software Products.
  *
- *   Copyright 2007-2012 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/".
  *
- *   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
- *   file is missing or damaged, see the license at "http://www.cups.org/".
- *
- *   This file is subject to the Apple OS-Developed Software exception.
- *
- * Contents:
- *
- *   cupsAddDest()                 - Add a destination to the list of
- *                                   destinations.
- *   _cupsAppleCopyDefaultPaperID() - Get the default paper ID.
- *   _cupsAppleCopyDefaultPrinter() - Get the default printer at this location.
- *   _cupsAppleGetUseLastPrinter()  - Get whether to use the last used printer.
- *   _cupsAppleSetDefaultPaperID()  - Set the default paper id.
- *   _cupsAppleSetDefaultPrinter()  - Set the default printer for this
- *                                   location.
- *   _cupsAppleSetUseLastPrinter()  - Set whether to use the last used printer.
- *   cupsConnectDest()             - Connect to the server for a destination.
- *   cupsConnectDestBlock()        - Connect to the server for a destination.
- *   cupsCopyDest()                - Copy a destination.
- *   cupsEnumDests()               - Enumerate available destinations with a
- *                                   callback function.
- *   cupsEnumDestsBlock()          - Enumerate available destinations with a
- *                                   block.
- *   cupsFreeDests()               - Free the memory used by the list of
- *                                   destinations.
- *   cupsGetDest()                 - Get the named destination from the list.
- *   _cupsGetDestResource()        - Get the resource path and URI for a
- *                                   destination.
- *   _cupsGetDests()               - Get destinations from a server.
- *   cupsGetDests()                - Get the list of destinations from the
- *                                   default server.
- *   cupsGetDests2()               - Get the list of destinations from the
- *                                   specified server.
- *   cupsGetNamedDest()            - Get options for the named destination.
- *   cupsRemoveDest()              - Remove a destination from the destination
- *                                   list.
- *   cupsSetDefaultDest()          - Set the default destination.
- *   cupsSetDests()                - Save the list of destinations for the
- *                                   default server.
- *   cupsSetDests2()               - Save the list of destinations for the
- *                                   specified server.
- *   _cupsUserDefault()            - Get the user default printer from
- *                                   environment variables and location
- *                                   information.
- *   appleCopyLocations()          - Copy the location history array.
- *   appleCopyNetwork()            - Get the network ID for the current
- *                                   location.
- *   appleGetPaperSize()           - Get the default paper size.
- *   appleGetPrinter()             - Get a printer from the history array.
- *   cups_add_dest()               - Add a destination to the array.
- *   cups_block_cb()               - Enumeration callback for block API.
- *   cups_compare_dests()          - Compare two destinations.
- *   cups_dnssd_browse_cb()        - Browse for printers.
- *   cups_dnssd_compare_device()    - Compare two devices.
- *   cups_dnssd_free_device()      - Free the memory used by a device.
- *   cups_dnssd_get_device()       - Lookup a device and create it as needed.
- *   cups_dnssd_local_cb()         - Browse for local printers.
- *   cups_dnssd_query_cb()         - Process query data.
- *   cups_dnssd_resolve()           - Resolve a Bonjour printer URI.
- *   cups_dnssd_resolve_cb()        - See if we should continue resolving.
- *   cups_dnssd_unquote()          - Unquote a name string.
- *   cups_find_dest()              - Find a destination using a binary search.
- *   cups_get_default()            - Get the default destination from an
- *                                   lpoptions file.
- *   cups_get_dests()              - Get destinations from a file.
- *   cups_make_string()            - Make a comma-separated string of values
- *                                   from an IPP attribute.
+ * This file is subject to the Apple OS-Developed Software exception.
  */
 
 /*
 #  include <dns_sd.h>
 #endif /* HAVE_DNSSD */
 
+#ifdef HAVE_AVAHI
+#  include <avahi-client/client.h>
+#  include <avahi-client/lookup.h>
+#  include <avahi-common/simple-watch.h>
+#  include <avahi-common/domain.h>
+#  include <avahi-common/error.h>
+#  include <avahi-common/malloc.h>
+#define kDNSServiceMaxDomainName AVAHI_DOMAIN_NAME_MAX
+#endif /* HAVE_AVAHI */
+
 
 /*
  * Constants...
  */
 
 #ifdef __APPLE__
-#  include <SystemConfiguration/SystemConfiguration.h>
+#  if !TARGET_OS_IOS
+#    include <SystemConfiguration/SystemConfiguration.h>
+#    define _CUPS_LOCATION_DEFAULTS 1
+#  endif /* !TARGET_OS_IOS */
 #  define kCUPSPrintingPrefs   CFSTR("org.cups.PrintingPrefs")
 #  define kDefaultPaperIDKey   CFSTR("DefaultPaperID")
 #  define kLastUsedPrintersKey CFSTR("LastUsedPrinters")
 #  define kUseLastPrinter      CFSTR("UseLastPrinter")
 #endif /* __APPLE__ */
 
+#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
+#  define _CUPS_DNSSD_MAXTIME  500     /* Milliseconds for maximum quantum of time */
+#endif /* HAVE_DNSSD || HAVE_AVAHI */
+
 
 /*
  * Types...
  */
 
-#ifdef HAVE_DNSSD
+#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
 typedef enum _cups_dnssd_state_e       /* Enumerated device state */
 {
   _CUPS_DNSSD_NEW,
@@ -125,12 +77,20 @@ typedef enum _cups_dnssd_state_e   /* Enumerated device state */
   _CUPS_DNSSD_PENDING,
   _CUPS_DNSSD_ACTIVE,
   _CUPS_DNSSD_LOCAL,
+  _CUPS_DNSSD_INCOMPATIBLE,
   _CUPS_DNSSD_ERROR
 } _cups_dnssd_state_t;
 
 typedef struct _cups_dnssd_data_s      /* Enumeration data */
 {
+#  ifdef HAVE_DNSSD
   DNSServiceRef                main_ref;       /* Main service reference */
+#  else /* HAVE_AVAHI */
+  AvahiSimplePoll      *simple_poll;   /* Polling interface */
+  AvahiClient          *client;        /* Client information */
+  int                  got_data;       /* Did we get data? */
+  int                  browsers;       /* How many browsers are running? */
+#  endif /* HAVE_DNSSD */
   cups_dest_cb_t       cb;             /* Callback */
   void                 *user_data;     /* User data pointer */
   cups_ptype_t         type,           /* Printer type filter */
@@ -141,10 +101,14 @@ typedef struct _cups_dnssd_data_s /* Enumeration data */
 typedef struct _cups_dnssd_device_s    /* Enumerated device */
 {
   _cups_dnssd_state_t  state;          /* State of device listing */
+#  ifdef HAVE_DNSSD
   DNSServiceRef                ref;            /* Service reference for query */
-  char                 *domain,        /* Domain name */
-                       *fullName,      /* Full name */
-                       *regtype;       /* Registration type */
+#  else /* HAVE_AVAHI */
+  AvahiRecordBrowser   *ref;           /* Browser for query */
+#  endif /* HAVE_DNSSD */
+  char                 *fullName,      /* Full name */
+                       *regtype,       /* Registration type */
+                       *domain;        /* Domain name */
   cups_ptype_t         type;           /* Device registration type */
   cups_dest_t          dest;           /* Destination record */
 } _cups_dnssd_device_t;
@@ -156,18 +120,34 @@ typedef struct _cups_dnssd_resolve_s      /* Data for resolving URI */
 } _cups_dnssd_resolve_t;
 #endif /* HAVE_DNSSD */
 
+typedef struct _cups_getdata_s
+{
+  int         num_dests;                /* Number of destinations */
+  cups_dest_t *dests;                   /* Destinations */
+} _cups_getdata_t;
+
+typedef struct _cups_namedata_s
+{
+  const char  *name;                    /* Named destination */
+  cups_dest_t *dest;                    /* Destination */
+} _cups_namedata_t;
+
 
 /*
  * Local functions...
  */
 
-#ifdef __APPLE__
+#if _CUPS_LOCATION_DEFAULTS
 static CFArrayRef      appleCopyLocations(void);
 static CFStringRef     appleCopyNetwork(void);
-static char            *appleGetPaperSize(char *name, int namesize);
-static CFStringRef     appleGetPrinter(CFArrayRef locations, CFStringRef network,
-                                       CFIndex *locindex);
+#endif /* _CUPS_LOCATION_DEFAULTS */
+#ifdef __APPLE__
+static char            *appleGetPaperSize(char *name, size_t namesize);
 #endif /* __APPLE__ */
+#if _CUPS_LOCATION_DEFAULTS
+static CFStringRef     appleGetPrinter(CFArrayRef locations,
+                                       CFStringRef network, CFIndex *locindex);
+#endif /* _CUPS_LOCATION_DEFAULTS */
 static cups_dest_t     *cups_add_dest(const char *name, const char *instance,
                                       int *num_dests, cups_dest_t **dests);
 #ifdef __BLOCKS__
@@ -175,7 +155,8 @@ static int          cups_block_cb(cups_dest_block_t block, unsigned flags,
                                      cups_dest_t *dest);
 #endif /* __BLOCKS__ */
 static int             cups_compare_dests(cups_dest_t *a, cups_dest_t *b);
-#ifdef HAVE_DNSSD
+#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
+#  ifdef HAVE_DNSSD
 static void            cups_dnssd_browse_cb(DNSServiceRef sdRef,
                                             DNSServiceFlags flags,
                                             uint32_t interfaceIndex,
@@ -184,6 +165,20 @@ static void                cups_dnssd_browse_cb(DNSServiceRef sdRef,
                                             const char *regtype,
                                             const char *replyDomain,
                                             void *context);
+#  else /* HAVE_AVAHI */
+static void            cups_dnssd_browse_cb(AvahiServiceBrowser *browser,
+                                            AvahiIfIndex interface,
+                                            AvahiProtocol protocol,
+                                            AvahiBrowserEvent event,
+                                            const char *serviceName,
+                                            const char *regtype,
+                                            const char *replyDomain,
+                                            AvahiLookupResultFlags flags,
+                                            void *context);
+static void            cups_dnssd_client_cb(AvahiClient *client,
+                                            AvahiClientState state,
+                                            void *context);
+#  endif /* HAVE_DNSSD */
 static int             cups_dnssd_compare_devices(_cups_dnssd_device_t *a,
                                                   _cups_dnssd_device_t *b);
 static void            cups_dnssd_free_device(_cups_dnssd_device_t *device,
@@ -193,6 +188,7 @@ static _cups_dnssd_device_t *
                                              const char *serviceName,
                                              const char *regtype,
                                              const char *replyDomain);
+#  ifdef HAVE_DNSSD
 static void            cups_dnssd_local_cb(DNSServiceRef sdRef,
                                            DNSServiceFlags flags,
                                            uint32_t interfaceIndex,
@@ -209,16 +205,32 @@ static void               cups_dnssd_query_cb(DNSServiceRef sdRef,
                                            uint16_t rrtype, uint16_t rrclass,
                                            uint16_t rdlen, const void *rdata,
                                            uint32_t ttl, void *context);
+#  else /* HAVE_AVAHI */
+static int             cups_dnssd_poll_cb(struct pollfd *pollfds,
+                                          unsigned int num_pollfds,
+                                          int timeout, void *context);
+static void            cups_dnssd_query_cb(AvahiRecordBrowser *browser,
+                                           AvahiIfIndex interface,
+                                           AvahiProtocol protocol,
+                                           AvahiBrowserEvent event,
+                                           const char *name, uint16_t rrclass,
+                                           uint16_t rrtype, const void *rdata,
+                                           size_t rdlen,
+                                           AvahiLookupResultFlags flags,
+                                           void *context);
+#  endif /* HAVE_DNSSD */
 static const char      *cups_dnssd_resolve(cups_dest_t *dest, const char *uri,
                                            int msec, int *cancel,
                                            cups_dest_cb_t cb, void *user_data);
 static int             cups_dnssd_resolve_cb(void *context);
 static void            cups_dnssd_unquote(char *dst, const char *src,
                                           size_t dstsize);
-#endif /* HAVE_DNSSD */
+#endif /* HAVE_DNSSD || HAVE_AVAHI */
+static int             cups_elapsed(struct timeval *t);
 static int             cups_find_dest(const char *name, const char *instance,
                                       int num_dests, cups_dest_t *dests, int prev,
                                       int *rdiff);
+static int              cups_get_cb(_cups_getdata_t *data, unsigned flags, cups_dest_t *dest);
 static char            *cups_get_default(const char *filename, char *namebuf,
                                          size_t namesize, const char **instance);
 static int             cups_get_dests(const char *filename, const char *match_name,
@@ -226,6 +238,8 @@ static int          cups_get_dests(const char *filename, const char *match_name,
                                       int num_dests, cups_dest_t **dests);
 static char            *cups_make_string(ipp_attribute_t *attr, char *buffer,
                                          size_t bufsize);
+static int              cups_name_cb(_cups_namedata_t *data, unsigned flags, cups_dest_t *dest);
+static void            cups_queue_name(char *name, const char *serviceName, size_t namesize);
 
 
 /*
@@ -264,7 +278,8 @@ cupsAddDest(const char  *name,              /* I  - Destination name */
     if (instance && !cupsGetDest(name, NULL, num_dests, *dests))
       return (num_dests);
 
-    dest = cups_add_dest(name, instance, &num_dests, dests);
+    if ((dest = cups_add_dest(name, instance, &num_dests, dests)) == NULL)
+      return (num_dests);
 
    /*
     * Find the base dest again now the array has been realloc'd.
@@ -278,7 +293,7 @@ cupsAddDest(const char  *name,              /* I  - Destination name */
       * Copy options from parent...
       */
 
-      dest->options = calloc(sizeof(cups_option_t), parent->num_options);
+      dest->options = calloc(sizeof(cups_option_t), (size_t)parent->num_options);
 
       if (dest->options)
       {
@@ -320,6 +335,7 @@ _cupsAppleCopyDefaultPaperID(void)
 CFStringRef                            /* O - Default printer name */
 _cupsAppleCopyDefaultPrinter(void)
 {
+#  if _CUPS_LOCATION_DEFAULTS
   CFStringRef  network;                /* Network location */
   CFArrayRef   locations;              /* Location array */
   CFStringRef  locprinter;             /* Current printer */
@@ -376,6 +392,10 @@ _cupsAppleCopyDefaultPrinter(void)
   CFRelease(locations);
 
   return (locprinter);
+
+#  else
+  return (NULL);
+#  endif /* _CUPS_LOCATION_DEFAULTS */
 }
 
 
@@ -413,7 +433,10 @@ _cupsAppleSetDefaultPaperID(
 {
   CFPreferencesSetAppValue(kDefaultPaperIDKey, name, kCUPSPrintingPrefs);
   CFPreferencesAppSynchronize(kCUPSPrintingPrefs);
+
+#  ifdef HAVE_NOTIFY_POST
   notify_post("com.apple.printerPrefsChange");
+#  endif /* HAVE_NOTIFY_POST */
 }
 
 
@@ -425,6 +448,7 @@ void
 _cupsAppleSetDefaultPrinter(
     CFStringRef name)                  /* I - Default printer/class name */
 {
+#  if _CUPS_LOCATION_DEFAULTS
   CFStringRef          network;        /* Current network */
   CFArrayRef           locations;      /* Old locations array */
   CFIndex              locindex;       /* Index in locations array */
@@ -501,7 +525,10 @@ _cupsAppleSetDefaultPrinter(
       CFPreferencesSetAppValue(kLastUsedPrintersKey, newlocations,
                                kCUPSPrintingPrefs);
       CFPreferencesAppSynchronize(kCUPSPrintingPrefs);
+
+#  ifdef HAVE_NOTIFY_POST
       notify_post("com.apple.printerPrefsChange");
+#  endif /* HAVE_NOTIFY_POST */
     }
 
     if (newlocations)
@@ -515,6 +542,10 @@ _cupsAppleSetDefaultPrinter(
     CFRelease(locations);
 
   CFRelease(network);
+
+#  else
+  (void)name;
+#  endif /* _CUPS_LOCATION_DEFAULTS */
 }
 
 
@@ -530,24 +561,28 @@ _cupsAppleSetUseLastPrinter(
                           uselast ? kCFBooleanTrue : kCFBooleanFalse,
                           kCUPSPrintingPrefs);
   CFPreferencesAppSynchronize(kCUPSPrintingPrefs);
+
+#  ifdef HAVE_NOTIFY_POST
   notify_post("com.apple.printerPrefsChange");
+#  endif /* HAVE_NOTIFY_POST */
 }
 #endif /* __APPLE__ */
 
 
 /*
- * 'cupsConnectDest()' - Connect to the server for a destination.
+ * 'cupsConnectDest()' - Open a conection to the destination.
  *
- * Connect to the destination, returning a new http_t connection object and
- * optionally the resource path to use for the destination.  These calls will
- * block until a connection is made, the timeout expires, the integer pointed
- * to by "cancel" is non-zero, or the callback function (or block) returns 0,
- * The caller is responsible for calling httpClose() on the returned object.
+ * Connect to the destination, returning a new @code http_t@ connection object
+ * and optionally the resource path to use for the destination.  These calls
+ * will block until a connection is made, the timeout expires, the integer
+ * pointed to by "cancel" is non-zero, or the callback function (or block)
+ * returns 0.  The caller is responsible for calling @link httpClose@ on the
+ * returned connection.
  *
- * @since CUPS 1.6@
+ * @since CUPS 1.6/macOS 10.8@
  */
 
-http_t *                               /* O - Connection to server or @code NULL@ */
+http_t *                               /* O - Connection to destination or @code NULL@ */
 cupsConnectDest(
     cups_dest_t    *dest,              /* I - Destination */
     unsigned       flags,              /* I - Connection flags */
@@ -570,6 +605,8 @@ cupsConnectDest(
   http_t       *http;                  /* Connection to server */
 
 
+  DEBUG_printf(("cupsConnectDest(dest=%p, flags=0x%x, msec=%d, cancel=%p(%d), resource=\"%s\", resourcesize=" CUPS_LLFMT ", cb=%p, user_data=%p)", (void *)dest, flags, msec, (void *)cancel, cancel ? *cancel : -1, resource, CUPS_LLCAST resourcesize, (void *)cb, user_data));
+
  /*
   * Range check input...
   */
@@ -579,7 +616,7 @@ cupsConnectDest(
     if (resource)
       *resource = '\0';
 
-    _cupsSetError(IPP_INTERNAL_ERROR, strerror(EINVAL), 0);
+    _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(EINVAL), 0);
     return (NULL);
   }
 
@@ -593,32 +630,45 @@ cupsConnectDest(
   * Grab the printer URI...
   */
 
-  if ((uri = cupsGetOption("printer-uri-supported", dest->num_options,
-                           dest->options)) == NULL)
+  if ((uri = cupsGetOption("printer-uri-supported", dest->num_options, dest->options)) == NULL)
   {
-    _cupsSetError(IPP_INTERNAL_ERROR, strerror(ENOENT), 0);
+    if ((uri = cupsGetOption("resolved-device-uri", 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, msec, cancel, cb, user_data);
+#endif /* HAVE_DNSSD || HAVE_AVAHI */
+      }
+    }
 
-    if (cb)
-      (*cb)(user_data, CUPS_DEST_FLAGS_UNCONNECTED | CUPS_DEST_FLAGS_ERROR,
-            dest);
+    if (uri)
+      uri = _cupsCreateDest(dest->name, cupsGetOption("printer-info", dest->num_options, dest->options), NULL, uri, tempresource, sizeof(tempresource));
 
-    return (NULL);
+    if (uri)
+    {
+      dest->num_options = cupsAddOption("printer-uri-supported", uri, dest->num_options, &dest->options);
+
+      uri = cupsGetOption("printer-uri-supported", dest->num_options, dest->options);
+    }
   }
 
-#ifdef HAVE_DNSSD
-  if (strstr(uri, "._tcp"))
+  if (!uri)
   {
-    if ((uri = cups_dnssd_resolve(dest, uri, msec, cancel, cb,
-                                  user_data)) == NULL)
-      return (NULL);
+    _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(ENOENT), 0);
+
+    if (cb)
+      (*cb)(user_data, CUPS_DEST_FLAGS_UNCONNECTED | CUPS_DEST_FLAGS_ERROR, dest);
+
+    return (NULL);
   }
-#endif /* HAVE_DNSSD */
 
   if (httpSeparateURI(HTTP_URI_CODING_ALL, uri, scheme, sizeof(scheme),
                       userpass, sizeof(userpass), hostname, sizeof(hostname),
-                      &port, resource, resourcesize) < HTTP_URI_OK)
+                      &port, resource, (int)resourcesize) < HTTP_URI_STATUS_OK)
   {
-    _cupsSetError(IPP_INTERNAL_ERROR, _("Bad printer URI."), 1);
+    _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("Bad printer-uri."), 1);
 
     if (cb)
       (*cb)(user_data, CUPS_DEST_FLAGS_UNCONNECTED | CUPS_DEST_FLAGS_ERROR,
@@ -632,16 +682,14 @@ cupsConnectDest(
   */
 
   if (cb)
-    (*cb)(user_data, CUPS_DEST_FLAGS_UNCONNECTED | CUPS_DEST_FLAGS_RESOLVING,
-          dest);
+    (*cb)(user_data, CUPS_DEST_FLAGS_UNCONNECTED | CUPS_DEST_FLAGS_RESOLVING, dest);
 
   snprintf(portstr, sizeof(portstr), "%d", port);
 
   if ((addrlist = httpAddrGetList(hostname, AF_UNSPEC, portstr)) == NULL)
   {
     if (cb)
-      (*cb)(user_data, CUPS_DEST_FLAGS_UNCONNECTED | CUPS_DEST_FLAGS_ERROR,
-            dest);
+      (*cb)(user_data, CUPS_DEST_FLAGS_UNCONNECTED | CUPS_DEST_FLAGS_ERROR, dest);
 
     return (NULL);
   }
@@ -651,8 +699,7 @@ cupsConnectDest(
     httpAddrFreeList(addrlist);
 
     if (cb)
-      (*cb)(user_data, CUPS_DEST_FLAGS_UNCONNECTED | CUPS_DEST_FLAGS_CANCELED,
-            dest);
+      (*cb)(user_data, CUPS_DEST_FLAGS_UNCONNECTED | CUPS_DEST_FLAGS_CANCELED, dest);
 
     return (NULL);
   }
@@ -662,11 +709,12 @@ cupsConnectDest(
   */
 
   if (!strcmp(scheme, "ipps") || port == 443)
-    encryption = HTTP_ENCRYPT_ALWAYS;
+    encryption = HTTP_ENCRYPTION_ALWAYS;
   else
-    encryption = HTTP_ENCRYPT_IF_REQUESTED;
+    encryption = HTTP_ENCRYPTION_IF_REQUESTED;
 
-  http = _httpCreate(hostname, port, addrlist, encryption, AF_UNSPEC);
+  http = httpConnect2(hostname, port, addrlist, AF_UNSPEC, encryption, 1, 0, NULL);
+  httpAddrFreeList(addrlist);
 
  /*
   * Connect if requested...
@@ -680,17 +728,14 @@ cupsConnectDest(
   else
   {
     if (cb)
-      (*cb)(user_data, CUPS_DEST_FLAGS_UNCONNECTED | CUPS_DEST_FLAGS_CONNECTING,
-            dest);
+      (*cb)(user_data, CUPS_DEST_FLAGS_UNCONNECTED | CUPS_DEST_FLAGS_CONNECTING, dest);
 
     if (!httpReconnect2(http, msec, cancel) && cb)
     {
       if (cancel && *cancel)
-       (*cb)(user_data,
-             CUPS_DEST_FLAGS_UNCONNECTED | CUPS_DEST_FLAGS_CONNECTING, dest);
+       (*cb)(user_data, CUPS_DEST_FLAGS_UNCONNECTED | CUPS_DEST_FLAGS_CONNECTING, dest);
       else
-       (*cb)(user_data, CUPS_DEST_FLAGS_UNCONNECTED | CUPS_DEST_FLAGS_ERROR,
-             dest);
+       (*cb)(user_data, CUPS_DEST_FLAGS_UNCONNECTED | CUPS_DEST_FLAGS_ERROR, dest);
     }
     else if (cb)
       (*cb)(user_data, CUPS_DEST_FLAGS_NONE, dest);
@@ -702,18 +747,18 @@ cupsConnectDest(
 
 #ifdef __BLOCKS__
 /*
- * 'cupsConnectDestBlock()' - Connect to the server for a destination.
+ * 'cupsConnectDestBlock()' - Open a connection to the destination.
  *
- * Connect to the destination, returning a new http_t connection object and
- * optionally the resource path to use for the destination.  These calls will
- * block until a connection is made, the timeout expires, the integer pointed
- * to by "cancel" is non-zero, or the callback function (or block) returns 0,
- * The caller is responsible for calling httpClose() on the returned object.
+ * Connect to the destination, returning a new @code http_t@ connection object
+ * and optionally the resource path to use for the destination.  These calls
+ * will block until a connection is made, the timeout expires, the integer
+ * pointed to by "cancel" is non-zero, or the block returns 0.  The caller is
+ * responsible for calling @link httpClose@ on the returned connection.
  *
- * @since CUPS 1.6@
+ * @since CUPS 1.6/macOS 10.8@ @exclude all@
  */
 
-http_t *                               /* O - Connection to server or @code NULL@ */
+http_t *                               /* O - Connection to destination or @code NULL@ */
 cupsConnectDestBlock(
     cups_dest_t       *dest,           /* I - Destination */
     unsigned          flags,           /* I - Connection flags */
@@ -736,13 +781,13 @@ cupsConnectDestBlock(
  * copy) - for use with the cupsEnumDests* functions. The caller is responsible
  * for calling cupsFreeDests() on the returned object(s).
  *
- * @since CUPS 1.6@
+ * @since CUPS 1.6/macOS 10.8@
  */
 
-int
-cupsCopyDest(cups_dest_t *dest,
-             int         num_dests,
-             cups_dest_t **dests)
+int                                     /* O  - New number of destinations */
+cupsCopyDest(cups_dest_t *dest,         /* I  - Destination to copy */
+             int         num_dests,     /* I  - Number of destinations */
+             cups_dest_t **dests)       /* IO - Destination array */
 {
   int          i;                      /* Looping var */
   cups_dest_t  *new_dest;              /* New destination pointer */
@@ -785,8 +830,7 @@ cupsCopyDest(cups_dest_t *dest,
 
   if (new_dest)
   {
-    if ((new_dest->options = calloc(sizeof(cups_option_t),
-                                    dest->num_options)) == NULL)
+    if ((new_dest->options = calloc(sizeof(cups_option_t), (size_t)dest->num_options)) == NULL)
       return (cupsRemoveDest(dest->name, dest->instance, num_dests, dests));
 
     new_dest->num_options = dest->num_options;
@@ -805,94 +849,275 @@ cupsCopyDest(cups_dest_t *dest,
 }
 
 
+/*
+ * '_cupsCreateDest()' - Create a local (temporary) queue.
+ */
+
+char *                                 /* O - Printer URI or @code NULL@ on error */
+_cupsCreateDest(const char *name,      /* I - Printer name */
+                const char *info,      /* I - Printer description of @code NULL@ */
+               const char *device_id,  /* I - 1284 Device ID or @code NULL@ */
+               const char *device_uri, /* I - Device URI */
+               char       *uri,        /* I - Printer URI buffer */
+               size_t     urisize)     /* I - Size of URI buffer */
+{
+  http_t       *http;                  /* Connection to server */
+  ipp_t                *request,               /* CUPS-Create-Local-Printer request */
+               *response;              /* CUPS-Create-Local-Printer response */
+  ipp_attribute_t *attr;               /* printer-uri-supported attribute */
+  ipp_pstate_t state = IPP_PSTATE_STOPPED;
+                                       /* printer-state value */
+
+
+  if (!name || !device_uri || !uri || urisize < 32)
+    return (NULL);
+
+  if ((http = httpConnect2(cupsServer(), ippPort(), NULL, AF_UNSPEC, HTTP_ENCRYPTION_IF_REQUESTED, 1, 30000, NULL)) == NULL)
+    return (NULL);
+
+  request = ippNewRequest(IPP_OP_CUPS_CREATE_LOCAL_PRINTER);
+
+  ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_URI, "printer-uri", NULL, "ipp://localhost/");
+  ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_NAME, "requesting-user-name", NULL, cupsUser());
+
+  ippAddString(request, IPP_TAG_PRINTER, IPP_TAG_URI, "device-uri", NULL, device_uri);
+  ippAddString(request, IPP_TAG_PRINTER, IPP_TAG_NAME, "printer-name", NULL, name);
+  if (info)
+    ippAddString(request, IPP_TAG_PRINTER, IPP_TAG_TEXT, "printer-info", NULL, info);
+  if (device_id)
+    ippAddString(request, IPP_TAG_PRINTER, IPP_TAG_TEXT, "printer-device-id", NULL, device_id);
+
+  response = cupsDoRequest(http, request, "/");
+
+  if ((attr = ippFindAttribute(response, "printer-uri-supported", IPP_TAG_URI)) != NULL)
+    strlcpy(uri, ippGetString(attr, 0, NULL), urisize);
+  else
+  {
+    ippDelete(response);
+    httpClose(http);
+    return (NULL);
+  }
+
+  if ((attr = ippFindAttribute(response, "printer-state", IPP_TAG_ENUM)) != NULL)
+    state = (ipp_pstate_t)ippGetInteger(attr, 0);
+
+  while (state == IPP_PSTATE_STOPPED && cupsLastError() == IPP_STATUS_OK)
+  {
+    sleep(1);
+    ippDelete(response);
+
+    request = ippNewRequest(IPP_OP_GET_PRINTER_ATTRIBUTES);
+
+    ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_URI, "printer-uri", NULL, uri);
+    ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_NAME, "requesting-user-name", NULL, cupsUser());
+    ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_KEYWORD, "requested-attributes", NULL, "printer-state");
+
+    response = cupsDoRequest(http, request, "/");
+
+    if ((attr = ippFindAttribute(response, "printer-state", IPP_TAG_ENUM)) != NULL)
+      state = (ipp_pstate_t)ippGetInteger(attr, 0);
+  }
+
+  ippDelete(response);
+
+  httpClose(http);
+
+  return (uri);
+}
+
+
 /*
  * 'cupsEnumDests()' - Enumerate available destinations with a callback function.
  *
- * Destinations are enumerated from one or more sources. The callback function
- * receives the @code user_data@ pointer, destination name, instance, number of
- * options, and options which can be used as input to the @link cupsAddDest@
- * function.  The function must return 1 to continue enumeration or 0 to stop.
+ * Destinations are enumerated from one or more sources.  The callback function
+ * receives the @code user_data@ pointer and the destination pointer which can
+ * be used as input to the @link cupsCopyDest@ function.  The function 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 callback function returns 0.
  *
- * @since CUPS 1.6@
+ * Note: The callback function 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@
  */
 
 int                                    /* O - 1 on success, 0 on failure */
 cupsEnumDests(
-    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 */
+  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 */
-#ifdef HAVE_DNSSD
-  int                  nfds,           /* Number of files responded */
-                       count,          /* Number of queries started */
+  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 */
-  int                  main_fd;        /* File descriptor for lookups */
+#  ifdef HAVE_DNSSD
+  int                  nfds,           /* Number of files responded */
+                       main_fd;        /* File descriptor for lookups */
   DNSServiceRef                ipp_ref,        /* IPP browser */
                        local_ipp_ref;  /* Local IPP browser */
-#  ifdef HAVE_SSL
+#    ifdef HAVE_SSL
   DNSServiceRef                ipps_ref,       /* IPPS browser */
                        local_ipps_ref; /* Local IPPS browser */
-#  endif /* HAVE_SSL */
-#  ifdef HAVE_POLL
+#    endif /* HAVE_SSL */
+#    ifdef HAVE_POLL
   struct pollfd                pfd;            /* Polling data */
-#  else
+#    else
   fd_set               input;          /* Input set for select() */
   struct timeval       timeout;        /* Timeout for select() */
-#  endif /* HAVE_POLL */
-#endif /* HAVE_DNSSD */
-
+#    endif /* HAVE_POLL */
+#  else /* HAVE_AVAHI */
+  int                  error;          /* Error value */
+  AvahiServiceBrowser  *ipp_ref;       /* IPP browser */
+#    ifdef HAVE_SSL
+  AvahiServiceBrowser  *ipps_ref;      /* IPPS browser */
+#    endif /* HAVE_SSL */
+#  endif /* HAVE_DNSSD */
+#endif /* HAVE_DNSSD || HAVE_AVAHI */
 
  /*
   * Range check input...
   */
 
+  (void)flags;
+
   if (!cb)
     return (0);
 
  /*
-  * Get the list of local printers and pass them to the callback function...
+  * Get ready to enumerate...
   */
 
-  num_dests = _cupsGetDests(CUPS_HTTP_DEFAULT, CUPS_GET_PRINTERS, NULL, &dests,
-                            type, mask);
+#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
+  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 */
 
-  for (i = num_dests, dest = dests;
-       i > 0 && (!cancel || !*cancel);
-       i --, dest ++)
-    if (!(*cb)(user_data, i > 1 ? CUPS_DEST_FLAGS_MORE : CUPS_DEST_FLAGS_NONE,
-               dest))
-      break;
+  if (!(mask & CUPS_PRINTER_DISCOVERED) || !(type & CUPS_PRINTER_DISCOVERED))
+  {
+   /*
+    * Get the list of local printers and pass them to the callback function...
+    */
 
-  cupsFreeDests(num_dests, dests);
+    num_dests = _cupsGetDests(CUPS_HTTP_DEFAULT, IPP_OP_CUPS_GET_PRINTERS, NULL,
+                              &dests, type, mask);
 
-  if (i > 0 || msec == 0)
-    return (1);
+    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;
+    }
+
+    if (defprinter)
+    {
+     /*
+      * Separate printer and instance name...
+      */
+
+      if ((instance = strchr(name, '/')) != NULL)
+        *instance++ = '\0';
+
+     /*
+      * Lookup the printer and instance and make it the default...
+      */
+
+      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 defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
+      const char *device_uri;          /* Device URI */
+#endif /* HAVE_DNSSD || HAVE_AVAHI */
+
+      if (!(*cb)(user_data, i > 1 ? CUPS_DEST_FLAGS_MORE : CUPS_DEST_FLAGS_NONE,
+                 dest))
+        break;
+
+#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...
+        */
+
+        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 (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';
+
+            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 */
+    }
+
+    cupsFreeDests(num_dests, dests);
+
+    if (i > 0 || msec == 0)
+      goto enum_finished;
+  }
 
-#ifdef HAVE_DNSSD
  /*
-  * Get Bonjour-shared printers...
+  * Return early if the caller doesn't want to do discovery...
   */
 
-  data.type    = type;
-  data.mask    = mask;
-  data.devices = cupsArrayNew3((cups_array_func_t)cups_dnssd_compare_devices,
-                               NULL, NULL, 0, NULL,
-                               (cups_afree_func_t)cups_dnssd_free_device);
+  if ((mask & CUPS_PRINTER_DISCOVERED) && !(type & CUPS_PRINTER_DISCOVERED))
+    goto enum_finished;
 
+#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
+ /*
+  * Get Bonjour-shared printers...
+  */
+
+#  ifdef HAVE_DNSSD
   if (DNSServiceCreateConnection(&data.main_ref) != kDNSServiceErr_NoError)
     return (0);
 
@@ -900,27 +1125,55 @@ cupsEnumDests(
 
   ipp_ref = data.main_ref;
   DNSServiceBrowse(&ipp_ref, kDNSServiceFlagsShareConnection, 0,
-                   "_ipp._tcp,_cups", NULL,
+                   "_ipp._tcp", NULL,
                    (DNSServiceBrowseReply)cups_dnssd_browse_cb, &data);
 
   local_ipp_ref = data.main_ref;
   DNSServiceBrowse(&local_ipp_ref, kDNSServiceFlagsShareConnection,
                    kDNSServiceInterfaceIndexLocalOnly,
-                   "_ipp._tcp,_cups", NULL,
+                   "_ipp._tcp", NULL,
                    (DNSServiceBrowseReply)cups_dnssd_local_cb, &data);
 
-#  ifdef HAVE_SSL
+#    ifdef HAVE_SSL
   ipps_ref = data.main_ref;
   DNSServiceBrowse(&ipps_ref, kDNSServiceFlagsShareConnection, 0,
-                   "_ipps._tcp,_cups", NULL,
+                   "_ipps._tcp", NULL,
                    (DNSServiceBrowseReply)cups_dnssd_browse_cb, &data);
 
   local_ipps_ref = data.main_ref;
   DNSServiceBrowse(&local_ipps_ref, kDNSServiceFlagsShareConnection,
                    kDNSServiceInterfaceIndexLocalOnly,
-                   "_ipps._tcp,_cups", NULL,
+                   "_ipps._tcp", NULL,
                    (DNSServiceBrowseReply)cups_dnssd_local_cb, &data);
-#  endif /* HAVE_SSL */
+#    endif /* HAVE_SSL */
+
+#  else /* HAVE_AVAHI */
+  if ((data.simple_poll = avahi_simple_poll_new()) == NULL)
+  {
+    DEBUG_puts("cupsEnumDests: Unable to create Avahi simple poll object.");
+    return (1);
+  }
+
+  avahi_simple_poll_set_func(data.simple_poll, cups_dnssd_poll_cb, &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("cupsEnumDests: Unable to create Avahi client.");
+    avahi_simple_poll_free(data.simple_poll);
+    return (1);
+  }
+
+  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);
+
+#    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 */
 
   if (msec < 0)
     remaining = INT_MAX;
@@ -933,41 +1186,66 @@ cupsEnumDests(
     * Check for input...
     */
 
-#  ifdef HAVE_POLL
+    DEBUG_printf(("1cupsEnumDests: remaining=%d", remaining));
+
+    cups_elapsed(&curtime);
+
+#  ifdef HAVE_DNSSD
+#    ifdef HAVE_POLL
     pfd.fd     = main_fd;
     pfd.events = POLLIN;
 
-    nfds = poll(&pfd, 1, remaining > 250 ? 250 : remaining);
+    nfds = poll(&pfd, 1, remaining > _CUPS_DNSSD_MAXTIME ? _CUPS_DNSSD_MAXTIME : remaining);
 
-#  else
+#    else
     FD_ZERO(&input);
     FD_SET(main_fd, &input);
 
     timeout.tv_sec  = 0;
-    timeout.tv_usec = remaining > 250 ? 250000 : remaining * 1000;
+    timeout.tv_usec = 1000 * (remaining > _CUPS_DNSSD_MAXTIME ? _CUPS_DNSSD_MAXTIME : remaining);
 
     nfds = select(main_fd + 1, &input, NULL, NULL, &timeout);
-#  endif /* HAVE_POLL */
+#    endif /* HAVE_POLL */
 
     if (nfds > 0)
       DNSServiceProcessResult(data.main_ref);
-    else if (nfds == 0)
-      remaining -= 250;
+
+#  else /* HAVE_AVAHI */
+    data.got_data = 0;
+
+    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.
+      */
+
+      break;
+    }
+
+    DEBUG_printf(("1cupsEnumDests: got_data=%d", data.got_data));
+#  endif /* HAVE_DNSSD */
+
+    remaining -= cups_elapsed(&curtime);
 
     for (device = (_cups_dnssd_device_t *)cupsArrayFirst(data.devices),
-             count = 0;
+             count = 0, completed = 0;
          device;
          device = (_cups_dnssd_device_t *)cupsArrayNext(data.devices))
     {
       if (device->ref)
         count ++;
 
+      if (device->state == _CUPS_DNSSD_ACTIVE)
+        completed ++;
+
       if (!device->ref && device->state == _CUPS_DNSSD_NEW)
       {
-        device->ref = data.main_ref;
-
        DEBUG_printf(("1cupsEnumDests: Querying '%s'.", device->fullName));
 
+#  ifdef HAVE_DNSSD
+        device->ref = data.main_ref;
+
        if (DNSServiceQueryRecord(&(device->ref),
                                  kDNSServiceFlagsShareConnection,
                                  0, device->fullName,
@@ -985,32 +1263,85 @@ cupsEnumDests(
 
          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)
       {
-       if (!(*cb)(user_data, CUPS_DEST_FLAGS_NONE, &device->dest))
-       {
-         remaining = -1;
-         break;
-       }
+        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;
       }
     }
-  }
 
-  cupsArrayDelete(data.devices);
+#  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 */
+  }
+
+#  ifdef HAVE_DNSSD
   DNSServiceRefDeallocate(ipp_ref);
   DNSServiceRefDeallocate(local_ipp_ref);
 
-#  ifdef HAVE_SSL
+#    ifdef HAVE_SSL
   DNSServiceRefDeallocate(ipp_ref);
   DNSServiceRefDeallocate(local_ipp_ref);
-#  endif /* HAVE_SSL */
+#    endif /* HAVE_SSL */
 
   DNSServiceRefDeallocate(data.main_ref);
-#endif /* HAVE_DNSSD */
+
+#  else /* HAVE_AVAHI */
+  avahi_service_browser_free(ipp_ref);
+#    ifdef HAVE_SSL
+  avahi_service_browser_free(ipps_ref);
+#    endif /* HAVE_SSL */
+
+  avahi_client_free(data.client);
+  avahi_simple_poll_free(data.simple_poll);
+#  endif /* HAVE_DNSSD */
+#endif /* HAVE_DNSSD || HAVE_DNSSD */
+
+ /*
+  * Return...
+  */
+
+  enum_finished:
+
+#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
+  cupsArrayDelete(data.devices);
+#endif /* HAVE_DNSSD || HAVE_AVAHI */
 
   return (1);
 }
@@ -1020,15 +1351,23 @@ cupsEnumDests(
 /*
  * 'cupsEnumDestsBlock()' - Enumerate available destinations with a block.
  *
- * Destinations are enumerated from one or more sources. The block receives the
- * destination name, instance, number of options, and options which can be used
- * as input to the @link cupsAddDest@ function.  The block must return 1 to
+ * 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.
  *
- * @since CUPS 1.6@
+ * 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@
  */
 
 int                                    /* O - 1 on success, 0 on failure */
@@ -1076,7 +1415,7 @@ cupsFreeDests(int         num_dests,      /* I - Number of destinations */
 /*
  * 'cupsGetDest()' - Get the named destination from the list.
  *
- * Use the @link cupsGetDests@ or @link cupsGetDests2@ functions to get a
+ * Use the @link cupsEnumDests@ or @link cupsGetDests2@ functions to get a
  * list of supported destinations for the current user.
  */
 
@@ -1141,6 +1480,8 @@ _cupsGetDestResource(
   int          port;                   /* Port number */
 
 
+  DEBUG_printf(("_cupsGetDestResource(dest=%p(%s), resource=%p, resourcesize=%d)", dest, dest->name, resource, (int)resourcesize));
+
  /*
   * Range check input...
   */
@@ -1150,55 +1491,187 @@ _cupsGetDestResource(
     if (resource)
       *resource = '\0';
 
-    _cupsSetError(IPP_INTERNAL_ERROR, strerror(EINVAL), 0);
+    _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(EINVAL), 0);
     return (NULL);
   }
 
  /*
-  * Grab the printer URI...
+  * Grab the printer URI...
+  */
+
+  if ((uri = cupsGetOption("printer-uri-supported", dest->num_options, dest->options)) == NULL)
+  {
+    if ((uri = cupsGetOption("resolved-device-uri", 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 */
+      }
+    }
+
+    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);
+    }
+
+    if (uri)
+    {
+      DEBUG_printf(("1_cupsGetDestResource: Local printer-uri-supported=\"%s\"", uri));
+
+      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.");
+
+      if (resource)
+        *resource = '\0';
+
+      _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(ENOENT), 0);
+
+      return (NULL);
+    }
+  }
+  else
+  {
+    DEBUG_printf(("1_cupsGetDestResource: printer-uri-supported=\"%s\"", uri));
+
+    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);
+
+      return (NULL);
+    }
+  }
+
+  DEBUG_printf(("1_cupsGetDestResource: resource=\"%s\"", resource));
+
+  return (uri);
+}
+
+
+/*
+ * '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@
+ */
+
+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 */
+
+
+ /*
+  * Range check input...
+  */
+
+  if (!uri)
+  {
+    _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(EINVAL), 0);
+    return (NULL);
+  }
+
+  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);
+
+    return (NULL);
+  }
+
+  if (name)
+  {
+    info = name;
+  }
+  else
+  {
+   /*
+    * Create the name from the URI...
+    */
+
+    if (strstr(hostname, "._tcp"))
+    {
+     /*
+      * Use the service instance name...
+      */
+
+      if ((ptr = strstr(hostname, "._")) != NULL)
+        *ptr = '\0';
+
+      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;
+    }
+  }
+
+ /*
+  * Create the destination...
   */
 
-  if ((uri = cupsGetOption("printer-uri-supported", dest->num_options,
-                           dest->options)) == NULL)
+  if ((dest = calloc(1, sizeof(cups_dest_t))) == NULL)
   {
-    if (resource)
-      *resource = '\0';
-
-    _cupsSetError(IPP_INTERNAL_ERROR, strerror(ENOENT), 0);
-
+    _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(errno), 0);
     return (NULL);
   }
 
-#ifdef HAVE_DNSSD
-  if (strstr(uri, "._tcp"))
-  {
-    if ((uri = cups_dnssd_resolve(dest, uri, 5000, NULL, NULL, NULL)) == NULL)
-      return (NULL);
-  }
-#endif /* HAVE_DNSSD */
-
-  if (httpSeparateURI(HTTP_URI_CODING_ALL, uri, scheme, sizeof(scheme),
-                      userpass, sizeof(userpass), hostname, sizeof(hostname),
-                      &port, resource, resourcesize) < HTTP_URI_OK)
-  {
-    _cupsSetError(IPP_INTERNAL_ERROR, _("Bad printer URI."), 1);
-
-    return (NULL);
-  }
+  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 (uri);
+  return (dest);
 }
 
 
 /*
  * '_cupsGetDests()' - Get destinations from a server.
  *
- * "op" is CUPS_GET_PRINTERS to get a full list, CUPS_GET_DEFAULT to get the
- * system-wide default printer, or IPP_GET_PRINTER_ATTRIBUTES for a known
- * printer.
+ * "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_GET_PRINTER_ATTRIBUTES.
+ * IPP_OP_GET_PRINTER_ATTRIBUTES.
  *
  * "dest" is initialized to point to the array of destinations.
  *
@@ -1208,7 +1681,7 @@ _cupsGetDestResource(
  * Free the memory used by the destination array using the @link cupsFreeDests@
  * function.
  *
- * Note: On Mac OS X this function also gets the default paper from the system
+ * 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.
  */
@@ -1260,6 +1733,7 @@ _cupsGetDests(http_t       *http, /* I  - Connection to server or
                  "printer-is-shared",
                  "printer-location",
                  "printer-make-and-model",
+                 "printer-mandatory-job-attributes",
                  "printer-name",
                  "printer-state",
                  "printer-state-change-time",
@@ -1269,6 +1743,8 @@ _cupsGetDests(http_t       *http, /* I  - Connection to server or
                };
 
 
+  DEBUG_printf(("_cupsGetDests(http=%p, op=%x(%s), name=\"%s\", dests=%p, type=%x, mask=%x)", http, op, ippOpString(op), name, dests, type, mask));
+
 #ifdef __APPLE__
  /*
   * Get the default paper size...
@@ -1278,13 +1754,13 @@ _cupsGetDests(http_t       *http,       /* I  - Connection to server or
 #endif /* __APPLE__ */
 
  /*
-  * Build a CUPS_GET_PRINTERS or IPP_GET_PRINTER_ATTRIBUTES request, which
+  * 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_GET_PRINTER_ATTRIBUTES]
+  *    printer-uri [for IPP_OP_GET_PRINTER_ATTRIBUTES]
   */
 
   request = ippNewRequest(op);
@@ -1296,7 +1772,7 @@ _cupsGetDests(http_t       *http, /* I  - Connection to server or
   ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_NAME,
                "requesting-user-name", NULL, cupsUser());
 
-  if (name && op != CUPS_GET_DEFAULT)
+  if (name && op != IPP_OP_CUPS_GET_DEFAULT)
   {
     httpAssembleURIf(HTTP_URI_CODING_ALL, uri, sizeof(uri), "ipp", NULL,
                      "localhost", ippPort(), "/printers/%s", name);
@@ -1305,10 +1781,8 @@ _cupsGetDests(http_t       *http,        /* I  - Connection to server or
   }
   else if (mask)
   {
-    ippAddInteger(request, IPP_TAG_OPERATION, IPP_TAG_ENUM, "printer-type",
-                  type);
-    ippAddInteger(request, IPP_TAG_OPERATION, IPP_TAG_ENUM, "printer-type-mask",
-                  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);
   }
 
  /*
@@ -1365,6 +1839,7 @@ _cupsGetDests(http_t       *http, /* I  - Connection to server or
            !strcmp(attr->name, "printer-info") ||
            !strcmp(attr->name, "printer-is-shared") ||
            !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") ||
@@ -1469,15 +1944,23 @@ _cupsGetDests(http_t       *http,       /* I  - Connection to server or
  * '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, and printer-type 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 well.
+ * "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@
  */
 
 int                                    /* O - Number of destinations */
@@ -1491,26 +1974,31 @@ cupsGetDests(cups_dest_t **dests)       /* O - Destinations */
  * '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, and printer-type 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 well.
+ * "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/Mac OS X 10.4@
+ * @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 */
 {
-  int          i;                      /* Looping var */
-  int          num_dests;              /* Number of destinations */
-  cups_dest_t  *dest;                  /* Destination pointer */
+  _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 */
@@ -1528,7 +2016,7 @@ cupsGetDests2(http_t      *http,  /* I - Connection to server or @code CUPS_HTTP_
 
   if (!dests)
   {
-    _cupsSetError(IPP_INTERNAL_ERROR, _("Bad NULL dests pointer"), 1);
+    _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("Bad NULL dests pointer"), 1);
     return (0);
   }
 
@@ -1536,13 +2024,17 @@ cupsGetDests2(http_t      *http,        /* I - Connection to server or @code CUPS_HTTP_
   * Grab the printers and classes...
   */
 
-  *dests    = (cups_dest_t *)0;
-  num_dests = _cupsGetDests(http, CUPS_GET_PRINTERS, NULL, dests, 0, 0);
+  data.num_dests = 0;
+  data.dests     = NULL;
+
+  cupsEnumDests(0, 1000, NULL, 0, 0, (cups_dest_cb_t)cups_get_cb, &data);
 
-  if (cupsLastError() >= IPP_REDIRECTION_OTHER_SITE)
+  if (cupsLastError() >= IPP_STATUS_REDIRECTION_OTHER_SITE)
   {
-    cupsFreeDests(num_dests, *dests);
+    cupsFreeDests(data.num_dests, data.dests);
+
     *dests = (cups_dest_t *)0;
+
     return (0);
   }
 
@@ -1550,13 +2042,13 @@ cupsGetDests2(http_t      *http,        /* I - Connection to server or @code CUPS_HTTP_
   * Make a copy of the "real" queues for a later sanity check...
   */
 
-  if (num_dests > 0)
+  if (data.num_dests > 0)
   {
-    num_reals = num_dests;
-    reals     = calloc(num_reals, sizeof(cups_dest_t));
+    num_reals = data.num_dests;
+    reals     = calloc((size_t)num_reals, sizeof(cups_dest_t));
 
     if (reals)
-      memcpy(reals, *dests, num_reals * sizeof(cups_dest_t));
+      memcpy(reals, data.dests, (size_t)num_reals * sizeof(cups_dest_t));
     else
       num_reals = 0;
   }
@@ -1591,7 +2083,7 @@ cupsGetDests2(http_t      *http,  /* I - Connection to server or @code CUPS_HTTP_
     * Lookup the printer and instance and make it the default...
     */
 
-    if ((dest = cupsGetDest(name, instance, num_dests, *dests)) != NULL)
+    if ((dest = cupsGetDest(name, instance, data.num_dests, data.dests)) != NULL)
       dest->is_default = 1;
   }
   else
@@ -1602,15 +2094,13 @@ cupsGetDests2(http_t      *http,        /* I - Connection to server or @code CUPS_HTTP_
   */
 
   snprintf(filename, sizeof(filename), "%s/lpoptions", cg->cups_serverroot);
-  num_dests = cups_get_dests(filename, NULL, NULL, user_default != NULL,
-                             num_dests, dests);
+  data.num_dests = cups_get_dests(filename, NULL, NULL, user_default != NULL, data.num_dests, &data.dests);
 
   if ((home = getenv("HOME")) != NULL)
   {
     snprintf(filename, sizeof(filename), "%s/.cups/lpoptions", home);
 
-    num_dests = cups_get_dests(filename, NULL, NULL, user_default != NULL,
-                               num_dests, dests);
+    data.num_dests = cups_get_dests(filename, NULL, NULL, user_default != NULL, data.num_dests, &data.dests);
   }
 
  /*
@@ -1625,27 +2115,21 @@ cupsGetDests2(http_t      *http,        /* I - Connection to server or @code CUPS_HTTP_
     * See if we have a default printer...
     */
 
-    if ((dest = cupsGetDest(NULL, NULL, num_dests, *dests)) != NULL)
+    if ((dest = cupsGetDest(NULL, NULL, data.num_dests, data.dests)) != NULL)
     {
      /*
       * Have a default; see if it is real...
       */
 
-      dest = cupsGetDest(dest->name, NULL, num_reals, reals);
-    }
-
-   /*
-    * If dest is NULL, then no default (that exists) is set, so we
-    * need to set a default if one exists...
-    */
-
-    if (dest == NULL && defprinter != NULL)
-    {
-      for (i = 0; i < num_dests; i ++)
-        (*dests)[i].is_default = 0;
+      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>)
+        */
 
-      if ((dest = cupsGetDest(name, instance, num_dests, *dests)) != NULL)
-       dest->is_default = 1;
+        data.num_dests = cupsRemoveDest(dest->name, dest->instance, data.num_dests, &data.dests);
+      }
     }
 
    /*
@@ -1659,10 +2143,12 @@ cupsGetDests2(http_t      *http,        /* I - Connection to server or @code CUPS_HTTP_
   * Return the number of destinations...
   */
 
-  if (num_dests > 0)
-    _cupsSetError(IPP_OK, NULL, 0);
+  *dests = data.dests;
 
-  return (num_dests);
+  if (data.num_dests > 0)
+    _cupsSetError(IPP_STATUS_OK, NULL, 0);
+
+  return (data.num_dests);
 }
 
 
@@ -1670,10 +2156,10 @@ cupsGetDests2(http_t      *http,        /* I - Connection to server or @code CUPS_HTTP_
  * 'cupsGetNamedDest()' - Get options for the named destination.
  *
  * This function is optimized for retrieving a single destination and should
- * be used instead of @link cupsGetDests@ 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.
+ * 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.
@@ -1684,7 +2170,7 @@ cupsGetDests2(http_t      *http,  /* I - Connection to server or @code CUPS_HTTP_
  * The returned destination must be freed using @link cupsFreeDests@ with a
  * "num_dests" value of 1.
  *
- * @since CUPS 1.4/Mac OS X 10.6@
+ * @since CUPS 1.4/macOS 10.6@
  */
 
 cups_dest_t *                          /* O - Destination or @code NULL@ */
@@ -1697,11 +2183,13 @@ cupsGetNamedDest(http_t     *http,      /* I - Connection to server or @code CUPS_HTT
                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_GET_PRINTER_ATTRIBUTES;
+  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\")", http, name, instance));
+
  /*
   * If "name" is NULL, find the default destination...
   */
@@ -1751,8 +2239,12 @@ cupsGetNamedDest(http_t     *http,       /* I - Connection to server or @code CUPS_HTT
       * No locally-set default destination, ask the server...
       */
 
-      op = CUPS_GET_DEFAULT;
+      op = IPP_OP_CUPS_GET_DEFAULT;
+
+      DEBUG_puts("1cupsGetNamedDest: Asking server for default printer...");
     }
+    else
+      DEBUG_printf(("1cupsGetNamedDest: Using name=\"%s\"...", name));
   }
 
  /*
@@ -1761,18 +2253,28 @@ cupsGetNamedDest(http_t     *http,      /* I - Connection to server or @code CUPS_HTT
 
   if (!_cupsGetDests(http, op, name, &dest, 0, 0))
   {
-    if (op == CUPS_GET_DEFAULT || (name && !set_as_default))
-      return (NULL);
+    if (name)
+    {
+      _cups_namedata_t  data;           /* Callback data */
 
-   /*
-    * The default printer from environment variables or from a
-    * configuration file does not exist.  Find out the real default.
-    */
+      DEBUG_puts("1cupsGetNamedDest: No queue found for printer, looking on network...");
+
+      data.name = name;
+      data.dest = NULL;
+
+      cupsEnumDests(0, 1000, NULL, 0, 0, (cups_dest_cb_t)cups_name_cb, &data);
+
+      if (!data.dest)
+        return (NULL);
 
-    if (!_cupsGetDests(http, CUPS_GET_DEFAULT, NULL, &dest, 0, 0))
+      dest = data.dest;
+    }
+    else
       return (NULL);
   }
 
+  DEBUG_printf(("1cupsGetNamedDest: Got dest=%p", dest));
+
   if (instance)
     dest->instance = _cupsStrAlloc(instance);
 
@@ -1809,7 +2311,7 @@ cupsGetNamedDest(http_t     *http,        /* I - Connection to server or @code CUPS_HTT
  * @link cupsSetDests@ or @link cupsSetDests2@ functions to save the new
  * options for the user.
  *
- * @since CUPS 1.3/Mac OS X 10.5@
+ * @since CUPS 1.3/macOS 10.5@
  */
 
 int                                    /* O  - New number of destinations */
@@ -1843,10 +2345,10 @@ cupsRemoveDest(const char  *name,       /* I  - Destination name */
 
   num_dests --;
 
-  i = dest - *dests;
+  i = (int)(dest - *dests);
 
   if (i < num_dests)
-    memmove(dest, dest + 1, (num_dests - i) * sizeof(cups_dest_t));
+    memmove(dest, dest + 1, (size_t)(num_dests - i) * sizeof(cups_dest_t));
 
   return (num_dests);
 }
@@ -1855,7 +2357,7 @@ cupsRemoveDest(const char  *name, /* I  - Destination name */
 /*
  * 'cupsSetDefaultDest()' - Set the default destination.
  *
- * @since CUPS 1.3/Mac OS X 10.5@
+ * @since CUPS 1.3/macOS 10.5@
  */
 
 void
@@ -1894,6 +2396,8 @@ cupsSetDefaultDest(
  *
  * This function saves the destinations to /etc/cups/lpoptions when run
  * as root and ~/.cups/lpoptions when run as a normal user.
+ *
+ * @exclude all@
  */
 
 void
@@ -1910,7 +2414,7 @@ cupsSetDests(int         num_dests,       /* I - Number of destinations */
  * 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/Mac OS X 10.4@
+ * @since CUPS 1.1.21/macOS 10.4@
  */
 
 int                                    /* O - 0 on success, -1 on error */
@@ -1946,9 +2450,9 @@ cupsSetDests2(http_t      *http,  /* I - Connection to server or @code CUPS_HTTP_
   * Get the server destinations...
   */
 
-  num_temps = _cupsGetDests(http, CUPS_GET_PRINTERS, NULL, &temps, 0, 0);
+  num_temps = _cupsGetDests(http, IPP_OP_CUPS_GET_PRINTERS, NULL, &temps, 0, 0);
 
-  if (cupsLastError() >= IPP_REDIRECTION_OTHER_SITE)
+  if (cupsLastError() >= IPP_STATUS_REDIRECTION_OTHER_SITE)
   {
     cupsFreeDests(num_temps, temps);
     return (-1);
@@ -2136,7 +2640,7 @@ cupsSetDests2(http_t      *http,  /* I - Connection to server or @code CUPS_HTTP_
 
 #ifdef HAVE_NOTIFY_POST
  /*
-  * Send a notification so that MacOS X applications can know about the
+  * Send a notification so that macOS applications can know about the
   * change, too.
   */
 
@@ -2180,7 +2684,7 @@ _cupsUserDefault(char   *name,            /* I - Name buffer */
 
   if ((locprinter = _cupsAppleCopyDefaultPrinter()) != NULL)
   {
-    CFStringGetCString(locprinter, name, namesize, kCFStringEncodingUTF8);
+    CFStringGetCString(locprinter, name, (CFIndex)namesize, kCFStringEncodingUTF8);
     CFRelease(locprinter);
   }
   else
@@ -2201,7 +2705,7 @@ _cupsUserDefault(char   *name,            /* I - Name buffer */
 }
 
 
-#ifdef __APPLE__
+#if _CUPS_LOCATION_DEFAULTS
 /*
  * 'appleCopyLocations()' - Copy the location history array.
  */
@@ -2294,27 +2798,28 @@ appleCopyNetwork(void)
 
   return (network);
 }
+#endif /* _CUPS_LOCATION_DEFAULTS */
 
 
+#ifdef __APPLE__
 /*
  * 'appleGetPaperSize()' - Get the default paper size.
  */
 
-char *                                 /* O - Default paper size */
-appleGetPaperSize(char *name,          /* I - Paper size name buffer */
-                  int  namesize)       /* I - Size of buffer */
+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 */
+  pwg_media_t  *pwgmedia;              /* PWG media size */
 
 
   defaultPaperID = _cupsAppleCopyDefaultPaperID();
   if (!defaultPaperID ||
       CFGetTypeID(defaultPaperID) != CFStringGetTypeID() ||
-      !CFStringGetCString(defaultPaperID, name, namesize,
-                         kCFStringEncodingUTF8))
+      !CFStringGetCString(defaultPaperID, name, (CFIndex)namesize, kCFStringEncodingUTF8))
     name[0] = '\0';
-  else if ((pwgmedia = _pwgMediaForLegacy(name)) != NULL)
+  else if ((pwgmedia = pwgMediaForLegacy(name)) != NULL)
     strlcpy(name, pwgmedia->pwg, namesize);
 
   if (defaultPaperID)
@@ -2322,8 +2827,10 @@ appleGetPaperSize(char *name,            /* I - Paper size name buffer */
 
   return (name);
 }
+#endif /* __APPLE__ */
 
 
+#if _CUPS_LOCATION_DEFAULTS
 /*
  * 'appleGetPrinter()' - Get a printer from the history array.
  */
@@ -2361,7 +2868,7 @@ appleGetPrinter(CFArrayRef  locations,    /* I - Location array */
 
   return (NULL);
 }
-#endif /* __APPLE__ */
+#endif /* _CUPS_LOCATION_DEFAULTS */
 
 
 /*
@@ -2388,7 +2895,7 @@ cups_add_dest(const char  *name,  /* I  - Name of destination */
   if (*num_dests == 0)
     dest = malloc(sizeof(cups_dest_t));
   else
-    dest = realloc(*dests, sizeof(cups_dest_t) * (*num_dests + 1));
+    dest = realloc(*dests, sizeof(cups_dest_t) * (size_t)(*num_dests + 1));
 
   if (!dest)
     return (NULL);
@@ -2415,8 +2922,7 @@ cups_add_dest(const char  *name,  /* I  - Name of destination */
   */
 
   if (insert < *num_dests)
-    memmove(*dests + insert + 1, *dests + insert,
-            (*num_dests - insert) * sizeof(cups_dest_t));
+    memmove(*dests + insert + 1, *dests + insert, (size_t)(*num_dests - insert) * sizeof(cups_dest_t));
 
   (*num_dests) ++;
 
@@ -2471,7 +2977,8 @@ cups_compare_dests(cups_dest_t *a,        /* I - First destination */
 }
 
 
-#ifdef HAVE_DNSSD
+#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
+#  ifdef HAVE_DNSSD
 /*
  * 'cups_dnssd_browse_cb()' - Browse for printers.
  */
@@ -2491,11 +2998,7 @@ cups_dnssd_browse_cb(
                                        /* Enumeration data */
 
 
-  DEBUG_printf(("5cups_dnssd_browse_cb(sdRef=%p, flags=%x, "
-               "interfaceIndex=%d, errorCode=%d, serviceName=\"%s\", "
-               "regtype=\"%s\", replyDomain=\"%s\", context=%p)",
-               sdRef, flags, interfaceIndex, errorCode, serviceName, regtype,
-               replyDomain, context));
+  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));
 
  /*
   * Don't do anything on error...
@@ -2512,6 +3015,110 @@ cups_dnssd_browse_cb(
 }
 
 
+#  else /* HAVE_AVAHI */
+/*
+ * 'cups_dnssd_browse_cb()' - Browse for printers.
+ */
+
+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 */
+{
+#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 */
+
+
+  (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;
+
+    case AVAHI_BROWSER_NEW:
+       /*
+       * This object is new on the network.
+       */
+
+       if (flags & AVAHI_LOOKUP_RESULT_LOCAL)
+       {
+        /*
+         * This comes from the local machine so ignore it.
+         */
+
+         DEBUG_printf(("cups_dnssd_browse_cb: Ignoring local service \"%s\".", name));
+       }
+       else
+       {
+        /*
+         * Create a device entry for it if it doesn't yet exist.
+         */
+
+         cups_dnssd_get_device(data, name, type, domain);
+       }
+       break;
+
+    case AVAHI_BROWSER_REMOVE :
+    case AVAHI_BROWSER_CACHE_EXHAUSTED :
+        break;
+
+    case AVAHI_BROWSER_ALL_FOR_NOW :
+        DEBUG_puts("cups_dnssd_browse_cb: ALL_FOR_NOW");
+        data->browsers --;
+        break;
+  }
+}
+
+
+/*
+ * 'cups_dnssd_client_cb()' - Avahi client callback function.
+ */
+
+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 */
+
+
+  (void)client;
+
+  DEBUG_printf(("cups_dnssd_client_cb(client=%p, state=%d, context=%p)", client, state, context));
+
+ /*
+  * 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 /* HAVE_DNSSD */
+
+
 /*
  * 'cups_dnssd_compare_device()' - Compare two devices.
  */
@@ -2534,11 +3141,15 @@ 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)", device,
-                device->dest.name, 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 */
 
   _cupsStrFree(device->domain);
   _cupsStrFree(device->fullName);
@@ -2564,19 +3175,20 @@ cups_dnssd_get_device(
 {
   _cups_dnssd_device_t key,            /* Search key */
                        *device;        /* Device */
-  char                 fullName[kDNSServiceMaxDomainName];
+  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\")", data, serviceName,
-                regtype, replyDomain));
+  DEBUG_printf(("5cups_dnssd_get_device(data=%p, serviceName=\"%s\", regtype=\"%s\", replyDomain=\"%s\")", (void *)data, serviceName, regtype, replyDomain));
 
  /*
   * See if this is an existing device...
   */
 
-  key.dest.name = (char *)serviceName;
+  cups_queue_name(name, serviceName, sizeof(name));
+
+  key.dest.name = name;
 
   if ((device = cupsArrayFind(data->devices, &key)) != NULL)
   {
@@ -2637,10 +3249,12 @@ cups_dnssd_get_device(
                   replyDomain));
 
     device            = calloc(sizeof(_cups_dnssd_device_t), 1);
-    device->dest.name = _cupsStrAlloc(serviceName);
+    device->dest.name = _cupsStrAlloc(name);
     device->domain    = _cupsStrAlloc(replyDomain);
     device->regtype   = _cupsStrAlloc(regtype);
 
+    device->dest.num_options = cupsAddOption("printer-info", serviceName, 0, &device->dest.options);
+
     cupsArrayAdd(data->devices, device);
   }
 
@@ -2648,19 +3262,30 @@ cups_dnssd_get_device(
   * Set the "full name" of this service, which is used for queries...
   */
 
-  DNSServiceConstructFullName(fullName, device->dest.name, device->regtype,
-                             device->domain);
+#  ifdef HAVE_DNSSD
+  DNSServiceConstructFullName(fullName, serviceName, regtype, replyDomain);
+#  else /* HAVE_AVAHI */
+  avahi_service_name_join(fullName, kDNSServiceMaxDomainName, serviceName, regtype, replyDomain);
+#  endif /* HAVE_DNSSD */
+
   _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 */
+
     device->ref = 0;
   }
 
   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;
   }
@@ -2669,6 +3294,7 @@ cups_dnssd_get_device(
 }
 
 
+#  ifdef HAVE_DNSSD
 /*
  * 'cups_dnssd_local_cb()' - Browse for local printers.
  */
@@ -2689,11 +3315,7 @@ cups_dnssd_local_cb(
   _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)",
-               sdRef, flags, interfaceIndex, errorCode, serviceName,
-               regtype, replyDomain, context));
+  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...
@@ -2722,16 +3344,66 @@ cups_dnssd_local_cb(
   }
 
   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.
+ *       (Avahi Ticket #364)
+ *
+ * @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(("cups_dnssd_poll_cb(pollfds=%p, num_pollfds=%d, timeout=%d, context=%p)", pollfds, num_pollfds, timeout, context));
+
+  (void)timeout;
+
+  val = poll(pollfds, num_pollfds, _CUPS_DNSSD_MAXTIME);
+
+  DEBUG_printf(("cups_dnssd_poll_cb: poll() returned %d", val));
+
+  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 */
 
 
 /*
  * 'cups_dnssd_query_cb()' - Process query data.
  */
 
+#  ifdef HAVE_DNSSD
 static void
 cups_dnssd_query_cb(
     DNSServiceRef       sdRef,         /* I - Service reference */
@@ -2746,19 +3418,38 @@ cups_dnssd_query_cb(
     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             *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 */
+#  endif /* HAVE_DNSSD */
   _cups_dnssd_data_t   *data = (_cups_dnssd_data_t *)context;
                                        /* Enumeration data */
-  char                 name[1024],     /* Service name */
+  char                 serviceName[256],/* Service name */
+                       name[128],      /* Queue name */
                        *ptr;           /* Pointer into string */
   _cups_dnssd_device_t dkey,           /* Search key */
                        *device;        /* Device */
 
 
-  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)", sdRef, flags, interfaceIndex, errorCode,
-               fullName, rrtype, rrclass, rdlen, rdata, ttl, context));
+#  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));
 
  /*
   * Only process "add" data...
@@ -2767,22 +3458,39 @@ cups_dnssd_query_cb(
   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));
+
  /*
-  * Lookup the service in the devices array.
+  * Only process "add" data...
   */
 
-  dkey.dest.name = name;
+  if (event != AVAHI_BROWSER_NEW)
+  {
+    if (event == AVAHI_BROWSER_FAILURE)
+      DEBUG_printf(("cups_dnssd_query_cb: %s", avahi_strerror(avahi_client_errno(client))));
+
+    return;
+  }
+#  endif /* HAVE_DNSSD */
 
-  cups_dnssd_unquote(name, fullName, sizeof(name));
+ /*
+  * Lookup the service in the devices array.
+  */
+
+  cups_dnssd_unquote(serviceName, fullName, sizeof(serviceName));
 
-  if ((ptr = strstr(name, "._")) != NULL)
+  if ((ptr = strstr(serviceName, "._")) != NULL)
     *ptr = '\0';
 
-  if ((device = cupsArrayFind(data->devices, &dkey)) != NULL)
+  cups_queue_name(name, serviceName, sizeof(name));
+
+  dkey.dest.name = name;
+
+  if ((device = cupsArrayFind(data->devices, &dkey)) != NULL && device->state == _CUPS_DNSSD_NEW)
   {
    /*
-    * Found it, pull out the priority and make and model from the TXT
-    * record and save it...
+    * Found it, pull out the make and model from the TXT record and save it...
     */
 
     const uint8_t      *txt,           /* Pointer into data */
@@ -2796,11 +3504,15 @@ cups_dnssd_query_cb(
                        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? */
 
     device->state     = _CUPS_DNSSD_PENDING;
     make_and_model[0] = '\0';
 
-    strcpy(model, "Unknown");
+    strlcpy(model, "Unknown", sizeof(model));
 
     for (txt = rdata, txtend = txt + rdlen;
         txt < txtend;
@@ -2820,7 +3532,7 @@ cups_dnssd_query_cb(
       txtnext = txt + txtlen;
 
       for (ptr = key; txt < txtnext && *txt != '='; txt ++)
-       *ptr++ = *txt;
+       *ptr++ = (char)*txt;
       *ptr = '\0';
 
       if (txt < txtnext && *txt == '=')
@@ -2828,7 +3540,7 @@ cups_dnssd_query_cb(
        txt ++;
 
        if (txt < txtnext)
-         memcpy(value, txt, txtnext - txt);
+         memcpy(value, txt, (size_t)(txtnext - txt));
        value[txtnext - txt] = '\0';
 
        DEBUG_printf(("6cups_dnssd_query_cb: %s=%s", key, value));
@@ -2842,10 +3554,10 @@ cups_dnssd_query_cb(
       if (!_cups_strcasecmp(key, "usb_MFG") ||
           !_cups_strcasecmp(key, "usb_MANU") ||
          !_cups_strcasecmp(key, "usb_MANUFACTURER"))
-       strcpy(make_and_model, value);
+       strlcpy(make_and_model, value, sizeof(make_and_model));
       else if (!_cups_strcasecmp(key, "usb_MDL") ||
                !_cups_strcasecmp(key, "usb_MODEL"))
-       strcpy(model, value);
+       strlcpy(model, value, sizeof(model));
       else if (!_cups_strcasecmp(key, "product") && !strstr(value, "Ghostscript"))
       {
        if (value[0] == '(')
@@ -2857,28 +3569,114 @@ cups_dnssd_query_cb(
          if ((ptr = value + strlen(value) - 1) > value && *ptr == ')')
            *ptr = '\0';
 
-         strcpy(model, value + 1);
+         strlcpy(model, value + 1, sizeof(model));
        }
        else
-         strcpy(model, value);
+         strlcpy(model, value, sizeof(model));
       }
       else if (!_cups_strcasecmp(key, "ty"))
       {
-       strcpy(model, value);
+       strlcpy(model, value, sizeof(model));
 
        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? */
+
+        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;
+          }
+
+          if ((next = strchr(start, ',')) != NULL)
+            next ++;
+        }
+
+        if (!have_pdf && !have_raster)
+          device->state = _CUPS_DNSSD_INCOMPATIBLE;
+      }
       else if (!_cups_strcasecmp(key, "printer-type"))
       {
-        device->dest.num_options = cupsAddOption("printer-type", value,
-                                                 device->dest.num_options,
-                                                 &device->dest.options);
+       /*
+        * Value is either NNNN or 0xXXXX
+        */
+
+       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;
       }
     }
 
    /*
-    * Save the make-and-model...
+    * Save the printer-xxx values...
     */
 
     if (make_and_model[0])
@@ -2886,16 +3684,14 @@ cups_dnssd_query_cb(
       strlcat(make_and_model, " ", sizeof(make_and_model));
       strlcat(make_and_model, model, sizeof(make_and_model));
 
-      device->dest.num_options = cupsAddOption("printer-make-and-model",
-                                              make_and_model,
-                                              device->dest.num_options,
-                                              &device->dest.options);
+      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);
+      device->dest.num_options = cupsAddOption("printer-make-and-model", model, device->dest.num_options, &device->dest.options);
+
+    device->type = type;
+    snprintf(value, sizeof(value), "%u", type);
+    device->dest.num_options = cupsAddOption("printer-type", value, device->dest.num_options, &device->dest.options);
 
    /*
     * Save the URI...
@@ -2904,13 +3700,11 @@ cups_dnssd_query_cb(
     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, "/cups");
+                    NULL, uriname, 0, saw_printer_type ? "/cups" : "/");
 
-    DEBUG_printf(("6cups_dnssd_query: printer-uri-supported=\"%s\"", uri));
+    DEBUG_printf(("6cups_dnssd_query: device-uri=\"%s\"", uri));
 
-    device->dest.num_options = cupsAddOption("printer-uri-supported", uri,
-                                            device->dest.num_options,
-                                            &device->dest.options);
+    device->dest.num_options = cupsAddOption("device-uri", uri, device->dest.num_options, &device->dest.options);
   }
   else
     DEBUG_printf(("6cups_dnssd_query: Ignoring TXT record for '%s'.",
@@ -2956,18 +3750,14 @@ cups_dnssd_resolve(
     resolve.end_time.tv_sec += 75;
 
   if (cb)
-    (*cb)(user_data, CUPS_DEST_FLAGS_UNCONNECTED | CUPS_DEST_FLAGS_RESOLVING,
-         dest);
+    (*cb)(user_data, CUPS_DEST_FLAGS_UNCONNECTED | CUPS_DEST_FLAGS_RESOLVING, dest);
 
-  if ((uri = _httpResolveURI(uri, tempuri, sizeof(tempuri),
-                            _HTTP_RESOLVE_FQDN, cups_dnssd_resolve_cb,
-                            &resolve)) == NULL)
+  if ((uri = _httpResolveURI(uri, tempuri, sizeof(tempuri), _HTTP_RESOLVE_DEFAULT, cups_dnssd_resolve_cb, &resolve)) == NULL)
   {
-    _cupsSetError(IPP_INTERNAL_ERROR, _("Unable to resolve printer URI."), 1);
+    _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);
+      (*cb)(user_data, CUPS_DEST_FLAGS_UNCONNECTED | CUPS_DEST_FLAGS_ERROR, dest);
 
     return (NULL);
   }
@@ -2976,11 +3766,9 @@ cups_dnssd_resolve(
   * Save the resolved URI...
   */
 
-  dest->num_options = cupsAddOption("printer-uri-supported", uri,
-                                   dest->num_options, &dest->options);
+  dest->num_options = cupsAddOption("resolved-device-uri", uri, dest->num_options, &dest->options);
 
-  return (cupsGetOption("printer-uri-supported", dest->num_options,
-                        dest->options));
+  return (cupsGetOption("resolved-device-uri", dest->num_options, dest->options));
 }
 
 
@@ -3000,8 +3788,11 @@ cups_dnssd_resolve_cb(void *context)     /* I - Resolve data */
   * If the cancel variable is set, return immediately.
   */
 
-  if (*resolve->cancel)
+  if (resolve->cancel && *(resolve->cancel))
+  {
+    DEBUG_puts("4cups_dnssd_resolve_cb: Canceled.");
     return (0);
+  }
 
  /*
   * Otherwise check the end time...
@@ -3009,9 +3800,11 @@ cups_dnssd_resolve_cb(void *context)     /* I - Resolve data */
 
   gettimeofday(&curtime, NULL);
 
-  return (curtime.tv_sec > resolve->end_time.tv_sec ||
+  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));
+
+  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));
+           curtime.tv_usec < resolve->end_time.tv_usec));
 }
 
 
@@ -3050,6 +3843,27 @@ cups_dnssd_unquote(char       *dst,      /* I - Destination buffer */
 #endif /* HAVE_DNSSD */
 
 
+/*
+ * 'cups_elapsed()' - Return the elapsed time in milliseconds.
+ */
+
+static int                             /* O  - Elapsed time in milliseconds */
+cups_elapsed(struct timeval *t)                /* IO - Previous time */
+{
+  int                  msecs;          /* Milliseconds */
+  struct timeval       nt;             /* New time */
+
+
+  gettimeofday(&nt, NULL);
+
+  msecs = 1000 * (nt.tv_sec - t->tv_sec) + (nt.tv_usec - t->tv_usec) / 1000;
+
+  *t = nt;
+
+  return (msecs);
+}
+
+
 /*
  * 'cups_find_dest()' - Find a destination using a binary search.
  */
@@ -3153,6 +3967,36 @@ cups_find_dest(const char  *name,        /* I - Destination name */
 }
 
 
+/*
+ * 'cups_get_cb()' - Collect enumerated destinations.
+ */
+
+static int                              /* O - 1 to continue, 0 to stop */
+cups_get_cb(_cups_getdata_t *data,      /* I - Data from cupsGetDests */
+            unsigned        flags,      /* I - Enumeration flags */
+            cups_dest_t     *dest)      /* I - Destination */
+{
+  if (flags & CUPS_DEST_FLAGS_REMOVED)
+  {
+   /*
+    * Remove destination from array...
+    */
+
+    data->num_dests = cupsRemoveDest(dest->name, dest->instance, data->num_dests, &data->dests);
+  }
+  else
+  {
+   /*
+    * Add destination to array...
+    */
+
+    data->num_dests = cupsCopyDest(dest, data->num_dests, &data->dests);
+  }
+
+  return (1);
+}
+
+
 /*
  * 'cups_get_default()' - Get the default destination from an lpoptions file.
  */
@@ -3225,10 +4069,7 @@ cups_get_dests(
   int          linenum;                /* Current line number */
 
 
-  DEBUG_printf(("7cups_get_dests(filename=\"%s\", match_name=\"%s\", "
-                "match_inst=\"%s\", user_default_set=%d, num_dests=%d, "
-               "dests=%p)", filename, match_name, match_inst,
-               user_default_set, num_dests, dests));
+  DEBUG_printf(("7cups_get_dests(filename=\"%s\", match_name=\"%s\", match_inst=\"%s\", user_default_set=%d, num_dests=%d, dests=%p)", filename, match_name, match_inst, user_default_set, num_dests, (void *)dests));
 
  /*
   * Try to open the file...
@@ -3417,22 +4258,21 @@ cups_make_string(
     {
       case IPP_TAG_INTEGER :
       case IPP_TAG_ENUM :
-         snprintf(ptr, end - ptr + 1, "%d", attr->values[i].integer);
+         snprintf(ptr, (size_t)(end - ptr + 1), "%d", attr->values[i].integer);
          break;
 
       case IPP_TAG_BOOLEAN :
          if (attr->values[i].boolean)
-           strlcpy(ptr, "true", end - ptr + 1);
+           strlcpy(ptr, "true", (size_t)(end - ptr + 1));
          else
-           strlcpy(ptr, "false", end - ptr + 1);
+           strlcpy(ptr, "false", (size_t)(end - ptr + 1));
          break;
 
       case IPP_TAG_RANGE :
          if (attr->values[i].range.lower == attr->values[i].range.upper)
-           snprintf(ptr, end - ptr + 1, "%d", attr->values[i].range.lower);
+           snprintf(ptr, (size_t)(end - ptr + 1), "%d", attr->values[i].range.lower);
          else
-           snprintf(ptr, end - ptr + 1, "%d-%d", attr->values[i].range.lower,
-                    attr->values[i].range.upper);
+           snprintf(ptr, (size_t)(end - ptr + 1), "%d-%d", attr->values[i].range.lower, attr->values[i].range.upper);
          break;
 
       default :
@@ -3464,5 +4304,55 @@ cups_make_string(
 
 
 /*
- * End of "$Id: dest.c 9568 2011-02-25 06:13:56Z mike $".
+ * 'cups_name_cb()' - Find an enumerated destination.
+ */
+
+static int                              /* O - 1 to continue, 0 to stop */
+cups_name_cb(_cups_namedata_t *data,    /* I - Data from cupsGetNamedDest */
+             unsigned         flags,    /* I - Enumeration flags */
+             cups_dest_t      *dest)    /* I - Destination */
+{
+  DEBUG_printf(("2cups_name_cb(data=%p(%s), flags=%x, dest=%p(%s)", data, data->name, flags, dest, dest->name));
+
+  if (!(flags & CUPS_DEST_FLAGS_REMOVED) && !dest->instance && !strcasecmp(data->name, dest->name))
+  {
+   /*
+    * Copy destination and stop enumeration...
+    */
+
+    cupsCopyDest(dest, 0, &data->dest);
+    return (0);
+  }
+
+  return (1);
+}
+
+
+/*
+ * 'cups_queue_name()' - Create a local queue name based on the service name.
  */
+
+static void
+cups_queue_name(
+    char       *name,                  /* I - Name buffer */
+    const char *serviceName,           /* I - Service name */
+    size_t     namesize)               /* I - Size of name buffer */
+{
+  const char   *ptr;                   /* Pointer into serviceName */
+  char         *nameptr;               /* Pointer into name */
+
+
+  for (nameptr = name, ptr = serviceName; *ptr && nameptr < (name + namesize - 1); ptr ++)
+  {
+   /*
+    * Sanitize the printer name...
+    */
+
+    if (_cups_isalnum(*ptr))
+      *nameptr++ = *ptr;
+    else if (nameptr == name || nameptr[-1] != '_')
+      *nameptr++ = '_';
+  }
+
+  *nameptr = '\0';
+}