]> git.ipfire.org Git - thirdparty/cups.git/blobdiff - scheduler/client.c
Update svn:keyword properties.
[thirdparty/cups.git] / scheduler / client.c
index d5d1851a34c17cead712e218453cc16b00114901..b5cf43319d6fac644f7db238e8de5d6edaed3c75 100644 (file)
@@ -1,69 +1,93 @@
 /*
- * "$Id: client.c 5898 2006-08-28 18:54:10Z mike $"
+ * "$Id$"
  *
- *   Client routines for the Common UNIX Printing System (CUPS) scheduler.
+ *   Client routines for the CUPS scheduler.
  *
- *   Copyright 1997-2006 by Easy Software Products, all rights reserved.
+ *   Copyright 2007-2013 by Apple Inc.
+ *   Copyright 1997-2007 by Easy Software Products, all rights reserved.
  *
- *   These coded instructions, statements, and computer programs are the
- *   property of Easy Software Products 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 please contact Easy Software Products
- *   at:
- *
- *       Attn: CUPS Licensing Information
- *       Easy Software Products
- *       44141 Airport View Drive, Suite 204
- *       Hollywood, Maryland 20636 USA
+ *   This file contains Kerberos support code, copyright 2006 by
+ *   Jelmer Vernooij.
  *
- *       Voice: (301) 373-9600
- *       EMail: cups-info@cups.org
- *         WWW: 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/".
  *
  * Contents:
  *
- *   cupsdAcceptClient()     - Accept a new client.
- *   cupsdCloseAllClients()  - Close all remote clients immediately.
- *   cupsdCloseClient()      - Close a remote client.
- *   cupsdFlushHeader()      - Flush the header fields to the client.
- *   cupsdReadClient()       - Read data from a client.
- *   cupsdSendCommand()      - Send output from a command via HTTP.
- *   cupsdSendError()        - Send an error message via HTTP.
- *   cupsdSendHeader()       - Send an HTTP request.
- *   cupsdUpdateCGI()        - Read status messages from CGI scripts and programs.
- *   cupsdWriteClient()      - Write data to a client as needed.
- *   check_if_modified()     - Decode an "If-Modified-Since" line.
- *   encrypt_client()        - Enable encryption for the client...
- *   get_cdsa_server_certs() - Convert a keychain name into the CFArrayRef
- *                            required by SSLSetCertificate.
- *   get_file()              - Get a filename and state info.
- *   install_conf_file()     - Install a configuration file.
- *   is_cgi()                - Is the resource a CGI script/program?
- *   is_path_absolute()      - Is a path absolute and free of relative elements.
- *   make_certificate()      - Make a self-signed SSL/TLS certificate.
- *   pipe_command()          - Pipe the output of a command to the remote client.
- *   write_file()            - Send a file via HTTP.
+ *   cupsdAcceptClient()    - Accept a new client.
+ *   cupsdCloseAllClients() - Close all remote clients immediately.
+ *   cupsdCloseClient()     - Close a remote client.
+ *   cupsdFlushHeader()     - Flush the header fields to the client.
+ *   cupsdReadClient()     - Read data from a client.
+ *   cupsdSendCommand()     - Send output from a command via HTTP.
+ *   cupsdSendError()      - Send an error message via HTTP.
+ *   cupsdSendHeader()     - Send an HTTP request.
+ *   cupsdUpdateCGI()      - Read status messages from CGI scripts and
+ *                           programs.
+ *   cupsdWriteClient()     - Write data to a client as needed.
+ *   check_if_modified()    - Decode an "If-Modified-Since" line.
+ *   compare_clients()     - Compare two client connections.
+ *   data_ready()          - Check whether data is available from a client.
+ *   get_file()            - Get a filename and state info.
+ *   install_cupsd_conf()    - Install a configuration file.
+ *   is_cgi()              - Is the resource a CGI script/program?
+ *   is_path_absolute()     - Is a path absolute and free of relative elements
+ *                           (i.e. "..").
+ *   pipe_command()        - Pipe the output of a command to the remote
+ *                           client.
+ *   valid_host()          - Is the Host: field valid?
+ *   write_file()          - Send a file via HTTP.
+ *   write_pipe()          - Flag that data is available on the CGI pipe.
  */
 
 /*
  * Include necessary headers...
  */
 
-#include <cups/http-private.h>
 #include "cupsd.h"
 
-#ifdef HAVE_CDSASSL
-#  include <Security/Security.h>
-#  ifdef HAVE_SECBASEPRIV_H
-#    include <Security/SecBasePriv.h>
-#  else
-     extern const char *cssmErrorString(int error);
-#  endif /* HAVE_SECBASEPRIV_H */
-#endif /* HAVE_CDSASSL */
-#ifdef HAVE_GNUTLS
-#  include <gnutls/x509.h>
-#endif /* HAVE_GNUTLS */
+#ifdef __APPLE__
+#  include <libproc.h>
+#endif /* __APPLE__ */
+#ifdef HAVE_TCPD_H
+#  include <tcpd.h>
+#endif /* HAVE_TCPD_H */
+
+
+/*
+ * Local globals...
+ */
+
+static const char      * const http_states[] =
+                       {               /* HTTP state strings */
+                         "HTTP_STATE_ERROR",
+                         "HTTP_STATE_WAITING",
+                         "HTTP_STATE_OPTIONS",
+                         "HTTP_STATE_GET",
+                         "HTTP_STATE_GET_SEND",
+                         "HTTP_STATE_HEAD",
+                         "HTTP_STATE_POST",
+                         "HTTP_STATE_POST_RECV",
+                         "HTTP_STATE_POST_SEND",
+                         "HTTP_STATE_PUT",
+                         "HTTP_STATE_PUT_RECV",
+                         "HTTP_STATE_DELETE",
+                         "HTTP_STATE_TRACE",
+                         "HTTP_STATE_CONNECT",
+                         "HTTP_STATE_STATUS",
+                         "HTTP_STATE_UNKNOWN_METHOD",
+                         "HTTP_STATE_UNKNOWN_VERSION"
+                       };
+static const char      * const ipp_states[] =
+                       {               /* IPP state strings */
+                         "IPP_IDLE",
+                         "IPP_HEADER",
+                         "IPP_ATTRIBUTE",
+                         "IPP_DATA"
+                       };
 
 
 /*
 
 static int             check_if_modified(cupsd_client_t *con,
                                          struct stat *filestats);
-#ifdef HAVE_SSL
-static int             encrypt_client(cupsd_client_t *con);
-#endif /* HAVE_SSL */
-#ifdef HAVE_CDSASSL
-static CFArrayRef      get_cdsa_server_certs(void);
-#endif /* HAVE_CDSASSL */
-static char            *get_file(cupsd_client_t *con, struct stat *filestats, 
+static int             compare_clients(cupsd_client_t *a, cupsd_client_t *b,
+                                       void *data);
+static int             data_ready(cupsd_client_t *con);
+static char            *get_file(cupsd_client_t *con, struct stat *filestats,
                                  char *filename, int len);
-static http_status_t   install_conf_file(cupsd_client_t *con);
+static http_status_t   install_cupsd_conf(cupsd_client_t *con);
 static int             is_cgi(cupsd_client_t *con, const char *filename,
                               struct stat *filestats, mime_type_t *type);
 static int             is_path_absolute(const char *path);
-#ifdef HAVE_SSL
-static int             make_certificate(void);
-#endif /* HAVE_SSL */
 static int             pipe_command(cupsd_client_t *con, int infile, int *outfile,
                                     char *command, char *options, int root);
+static int             valid_host(cupsd_client_t *con);
 static int             write_file(cupsd_client_t *con, http_status_t code,
                                   char *filename, char *type,
                                   struct stat *filestats);
+static void            write_pipe(cupsd_client_t *con);
 
 
 /*
@@ -111,10 +131,13 @@ cupsdAcceptClient(cupsd_listener_t *lis)/* I - Listener socket */
   char                 *hostname;      /* Hostname for address */
   http_addr_t          temp;           /* Temporary address variable */
   static time_t                last_dos = 0;   /* Time of last DoS attack */
+#ifdef HAVE_TCPD_H
+  struct request_info  wrap_req;       /* TCP wrappers request information */
+#endif /* HAVE_TCPD_H */
 
 
   cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                  "cupsdAcceptClient(lis=%p) %d Clients = %d",
+                  "cupsdAcceptClient(lis=%p(%d)) Clients=%d",
                   lis, lis->fd, cupsArrayCount(Clients));
 
  /*
@@ -132,13 +155,36 @@ cupsdAcceptClient(cupsd_listener_t *lis)/* I - Listener socket */
     Clients = cupsArrayNew(NULL, NULL);
 
   if (!Clients)
+  {
+    cupsdLogMessage(CUPSD_LOG_ERROR,
+                    "Unable to allocate memory for clients array!");
+    cupsdPauseListening();
+    return;
+  }
+
+  if (!ActiveClients)
+    ActiveClients = cupsArrayNew((cups_array_func_t)compare_clients, NULL);
+
+  if (!ActiveClients)
+  {
+    cupsdLogMessage(CUPSD_LOG_ERROR,
+                    "Unable to allocate memory for active clients array!");
+    cupsdPauseListening();
     return;
+  }
 
-  con = calloc(1, sizeof(cupsd_client_t));
+  if ((con = calloc(1, sizeof(cupsd_client_t))) == NULL)
+  {
+    cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to allocate memory for client!");
+    cupsdPauseListening();
+    return;
+  }
 
-  con->http.activity = time(NULL);
-  con->file          = -1;
-  con->http.hostaddr = &(con->clientaddr);
+  con->file            = -1;
+  con->http.activity   = time(NULL);
+  con->http.hostaddr   = &(con->clientaddr);
+  con->http.wait_value = 10000;
+  con->http.mode       = _HTTP_MODE_SERVER;
 
  /*
   * Accept the client and get the remote address...
@@ -149,35 +195,34 @@ cupsdAcceptClient(cupsd_listener_t *lis)/* I - Listener socket */
   if ((con->http.fd = accept(lis->fd, (struct sockaddr *)con->http.hostaddr,
                              &addrlen)) < 0)
   {
+    if (errno == ENFILE || errno == EMFILE)
+      cupsdPauseListening();
+
     cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to accept client connection - %s.",
                     strerror(errno));
     free(con);
+
     return;
   }
 
-#ifdef AF_INET6
-  if (lis->address.addr.sa_family == AF_INET6)
-  {
-   /*
-    * Save the connected port number...
-    */
+ /*
+  * Save the connected port number...
+  */
 
-    con->http.hostaddr->ipv6.sin6_port = lis->address.ipv6.sin6_port;
+  _httpAddrSetPort(con->http.hostaddr, httpAddrPort(&(lis->address)));
 
-   /*
-    * Convert IPv4 over IPv6 addresses (::ffff:n.n.n.n) to IPv4 forms we
-    * can more easily use...
-    */
+#ifdef AF_INET6
+ /*
+  * Convert IPv4 over IPv6 addresses (::ffff:n.n.n.n) to IPv4 forms we
+  * can more easily use...
+  */
 
-    if (con->http.hostaddr->ipv6.sin6_addr.s6_addr32[0] == 0 &&
-        con->http.hostaddr->ipv6.sin6_addr.s6_addr32[1] == 0 &&
-        ntohl(con->http.hostaddr->ipv6.sin6_addr.s6_addr32[2]) == 0xffff)
-      con->http.hostaddr->ipv6.sin6_addr.s6_addr32[2] = 0;
-  }
-  else
+  if (lis->address.addr.sa_family == AF_INET6 &&
+      con->http.hostaddr->ipv6.sin6_addr.s6_addr32[0] == 0 &&
+      con->http.hostaddr->ipv6.sin6_addr.s6_addr32[1] == 0 &&
+      ntohl(con->http.hostaddr->ipv6.sin6_addr.s6_addr32[2]) == 0xffff)
+    con->http.hostaddr->ipv6.sin6_addr.s6_addr32[2] = 0;
 #endif /* AF_INET6 */
-  if (lis->address.addr.sa_family == AF_INET)
-    con->http.hostaddr->ipv4.sin_port = lis->address.ipv4.sin_port;
 
  /*
   * Check the number of clients on the same address...
@@ -201,7 +246,9 @@ cupsdAcceptClient(cupsd_listener_t *lis)/* I - Listener socket */
       cupsdLogMessage(CUPSD_LOG_WARN,
                       "Possible DoS attack - more than %d clients connecting "
                      "from %s!",
-                     MaxClientsPerHost, tempcon->http.hostname);
+                     MaxClientsPerHost,
+                     httpAddrString(con->http.hostaddr, con->http.hostname,
+                                    sizeof(con->http.hostname)));
     }
 
 #ifdef WIN32
@@ -233,16 +280,7 @@ cupsdAcceptClient(cupsd_listener_t *lis)/* I - Listener socket */
     * Map accesses from the same host to the server name.
     */
 
-    for (addr = ServerAddrs; addr; addr = addr->next)
-      if (httpAddrEqual(con->http.hostaddr, &(addr->addr)))
-        break;
-
-    if (addr)
-    {
-      strlcpy(con->http.hostname, ServerName, sizeof(con->http.hostname));
-      hostname = con->http.hostname;
-    }
-    else if (HostNameLookups)
+    if (HostNameLookups)
       hostname = httpAddrLookup(con->http.hostaddr, con->http.hostname,
                                 sizeof(con->http.hostname));
     else
@@ -259,10 +297,6 @@ cupsdAcceptClient(cupsd_listener_t *lis)/* I - Listener socket */
     * Can't have an unresolved IP address with double-lookups enabled...
     */
 
-    cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                    "cupsdAcceptClient: Closing connection %d...",
-                    con->http.fd);
-
 #ifdef WIN32
     closesocket(con->http.fd);
 #else
@@ -283,7 +317,8 @@ cupsdAcceptClient(cupsd_listener_t *lis)/* I - Listener socket */
     * Do double lookups as needed...
     */
 
-    if ((addrlist = httpAddrGetList(con->http.hostname, AF_UNSPEC, NULL)) != NULL)
+    if ((addrlist = httpAddrGetList(con->http.hostname, AF_UNSPEC, NULL))
+            != NULL)
     {
      /*
       * See if the hostname maps to the same IP address...
@@ -305,10 +340,6 @@ cupsdAcceptClient(cupsd_listener_t *lis)/* I - Listener socket */
       * with double-lookups enabled...
       */
 
-      cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                      "cupsdAcceptClient: Closing connection %d...",
-                     con->http.fd);
-
 #ifdef WIN32
       closesocket(con->http.fd);
 #else
@@ -323,22 +354,63 @@ cupsdAcceptClient(cupsd_listener_t *lis)/* I - Listener socket */
     }
   }
 
-#ifdef AF_INET6
-  if (con->http.hostaddr->addr.sa_family == AF_INET6)
-    cupsdLogMessage(CUPSD_LOG_DEBUG, "cupsdAcceptClient: %d from %s:%d (IPv6)",
-                    con->http.fd, con->http.hostname,
-                   ntohs(con->http.hostaddr->ipv6.sin6_port));
-  else
-#endif /* AF_INET6 */
+#ifdef HAVE_TCPD_H
+ /*
+  * See if the connection is denied by TCP wrappers...
+  */
+
+  request_init(&wrap_req, RQ_DAEMON, "cupsd", RQ_FILE, con->http.fd, NULL);
+  fromhost(&wrap_req);
+
+  if (!hosts_access(&wrap_req))
+  {
+#ifdef WIN32
+    closesocket(con->http.fd);
+#else
+    close(con->http.fd);
+#endif /* WIN32 */
+
+    cupsdLogMessage(CUPSD_LOG_WARN,
+                    "Connection from %s refused by /etc/hosts.allow and "
+                   "/etc/hosts.deny rules.", con->http.hostname);
+    free(con);
+    return;
+  }
+#endif /* HAVE_TCPD_H */
+
 #ifdef AF_LOCAL
   if (con->http.hostaddr->addr.sa_family == AF_LOCAL)
-    cupsdLogMessage(CUPSD_LOG_DEBUG, "cupsdAcceptClient: %d from %s (Domain)",
+  {
+#  ifdef __APPLE__
+    socklen_t  peersize;               /* Size of peer credentials */
+    pid_t      peerpid;                /* Peer process ID */
+    char       name[256];              /* Name of process */
+
+    peersize = sizeof(peerpid);
+    if (!getsockopt(con->http.fd, SOL_LOCAL, LOCAL_PEERPID, &peerpid,
+        &peersize))
+    {
+      if (!proc_name(peerpid, name, sizeof(name)))
+       cupsdLogMessage(CUPSD_LOG_DEBUG,
+                       "[Client %d] Accepted from %s (Domain ???[%d])",
+                       con->http.fd, con->http.hostname, (int)peerpid);
+      else
+       cupsdLogMessage(CUPSD_LOG_DEBUG,
+                       "[Client %d] Accepted from %s (Domain %s[%d])",
+                       con->http.fd, con->http.hostname, name, (int)peerpid);
+    }
+    else
+#  endif /* __APPLE__ */
+
+    cupsdLogMessage(CUPSD_LOG_DEBUG, "[Client %d] Accepted from %s (Domain)",
                     con->http.fd, con->http.hostname);
+  }
   else
 #endif /* AF_LOCAL */
-  cupsdLogMessage(CUPSD_LOG_DEBUG, "cupsdAcceptClient: %d from %s:%d (IPv4)",
+  cupsdLogMessage(CUPSD_LOG_DEBUG, "[Client %d] Accepted from %s:%d (IPv%d)",
                   con->http.fd, con->http.hostname,
-                 ntohs(con->http.hostaddr->ipv4.sin_port));
+                 httpAddrPort(con->http.hostaddr),
+                 _httpAddrFamily(con->http.hostaddr) == AF_INET ? 4 : 6);
 
  /*
   * Get the local address the client connected to...
@@ -350,46 +422,42 @@ cupsdAcceptClient(cupsd_listener_t *lis)/* I - Listener socket */
     cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to get local address - %s",
                     strerror(errno));
 
-    strcpy(con->servername, "localhost");
+    strlcpy(con->servername, "localhost", sizeof(con->servername));
+    con->serverport = LocalPort;
+  }
+#ifdef AF_LOCAL
+  else if (_httpAddrFamily(&temp) == AF_LOCAL)
+  {
+    strlcpy(con->servername, "localhost", sizeof(con->servername));
     con->serverport = LocalPort;
   }
+#endif /* AF_LOCAL */
   else
   {
-#ifdef AF_INET6
-    if (temp.addr.sa_family == AF_INET6)
-    {
-      httpAddrLookup(&temp, con->servername, sizeof(con->servername));
-      con->serverport = ntohs(lis->address.ipv6.sin6_port);
-    }
-    else
-#endif /* AF_INET6 */
-    if (temp.addr.sa_family == AF_INET)
-    {
+    if (httpAddrLocalhost(&temp))
+      strlcpy(con->servername, "localhost", sizeof(con->servername));
+    else if (HostNameLookups)
       httpAddrLookup(&temp, con->servername, sizeof(con->servername));
-      con->serverport = ntohs(lis->address.ipv4.sin_port);
-    }
     else
-    {
-      strcpy(con->servername, "localhost");
-      con->serverport = LocalPort;
-    }
+      httpAddrString(&temp, con->servername, sizeof(con->servername));
+
+    con->serverport = httpAddrPort(&(lis->address));
   }
 
-  cupsArrayAdd(Clients, con);
+ /*
+  * Add the connection to the array of active clients...
+  */
 
-  cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                  "cupsdAcceptClient: %d connected to server on %s:%d",
-                  con->http.fd, con->servername, con->serverport);
+  cupsArrayAdd(Clients, con);
 
  /*
-  * Using TCP_NODELAY improves responsiveness, especially on systems
-  * with a slow loopback interface...  Since we write large buffers
-  * when sending print files and requests, there shouldn't be any
-  * performance penalty for this...
+  * Using TCP_NODELAY improves responsiveness, especially on systems with a slow
+  * loopback interface.  Since we write large buffers when sending print files
+  * and requests there shouldn't be any performance penalty for this...
   */
 
   val = 1;
-  setsockopt(con->http.fd, IPPROTO_TCP, TCP_NODELAY, &val, sizeof(val)); 
+  setsockopt(con->http.fd, IPPROTO_TCP, TCP_NODELAY, &val, sizeof(val));
 
  /*
   * Close this file on all execs...
@@ -398,13 +466,10 @@ cupsdAcceptClient(cupsd_listener_t *lis)/* I - Listener socket */
   fcntl(con->http.fd, F_SETFD, fcntl(con->http.fd, F_GETFD) | FD_CLOEXEC);
 
  /*
-  * Add the socket to the select() input mask.
+  * Add the socket to the server select.
   */
 
-  cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                  "cupsdAcceptClient: Adding fd %d to InputSet...",
-                  con->http.fd);
-  FD_SET(con->http.fd, InputSet);
+  cupsdAddSelect(con->http.fd, (cupsd_selfunc_t)cupsdReadClient, NULL, con);
 
  /*
   * Temporarily suspend accept()'s until we lose a client...
@@ -426,7 +491,8 @@ cupsdAcceptClient(cupsd_listener_t *lis)/* I - Listener socket */
 
     con->http.encryption = HTTP_ENCRYPT_ALWAYS;
 
-    encrypt_client(con);
+    if (!cupsdStartTLS(con))
+      cupsdCloseClient(con);
   }
   else
     con->auto_ssl = 1;
@@ -444,10 +510,14 @@ cupsdCloseAllClients(void)
   cupsd_client_t       *con;           /* Current client */
 
 
+  cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCloseAllClients() Clients=%d",
+                  cupsArrayCount(Clients));
+
   for (con = (cupsd_client_t *)cupsArrayFirst(Clients);
        con;
        con = (cupsd_client_t *)cupsArrayNext(Clients))
-    cupsdCloseClient(con);
+    if (cupsdCloseClient(con))
+      cupsdCloseClient(con);
 }
 
 
@@ -460,20 +530,13 @@ cupsdCloseClient(cupsd_client_t *con)     /* I - Client to close */
 {
   int          partial;                /* Do partial close for SSL? */
 #ifdef HAVE_LIBSSL
-  SSL_CTX      *context;               /* Context for encryption */
-  SSL          *conn;                  /* Connection for encryption */
-  unsigned long        error;                  /* Error code */
 #elif defined(HAVE_GNUTLS)
-  http_tls_t   *conn;                  /* TLS connection information */
-  int          error;                  /* Error code */
-  gnutls_certificate_server_credentials *credentials;
-                                       /* TLS credentials */
 #  elif defined(HAVE_CDSASSL)
-  http_tls_t   *conn;                  /* CDSA connection information */
 #endif /* HAVE_LIBSSL */
 
 
-  cupsdLogMessage(CUPSD_LOG_DEBUG, "cupsdCloseClient: %d", con->http.fd);
+  cupsdLogMessage(CUPSD_LOG_DEBUG, "[Client %d] Closing connection.",
+                  con->http.fd);
 
  /*
   * Flush pending writes before closing...
@@ -492,66 +555,7 @@ cupsdCloseClient(cupsd_client_t *con)      /* I - Client to close */
   {
     partial = 1;
 
-#  ifdef HAVE_LIBSSL
-    conn    = (SSL *)(con->http.tls);
-    context = SSL_get_SSL_CTX(conn);
-
-    switch (SSL_shutdown(conn))
-    {
-      case 1 :
-          cupsdLogMessage(CUPSD_LOG_INFO,
-                         "cupsdCloseClient: SSL shutdown successful!");
-         break;
-      case -1 :
-          cupsdLogMessage(CUPSD_LOG_ERROR,
-                         "cupsdCloseClient: Fatal error during SSL shutdown!");
-      default :
-         while ((error = ERR_get_error()) != 0)
-           cupsdLogMessage(CUPSD_LOG_ERROR, "cupsdCloseClient: %s",
-                           ERR_error_string(error, NULL));
-          break;
-    }
-
-    SSL_CTX_free(context);
-    SSL_free(conn);
-
-#  elif defined(HAVE_GNUTLS)
-    conn        = (http_tls_t *)(con->http.tls);
-    credentials = (gnutls_certificate_server_credentials *)(conn->credentials);
-
-    error = gnutls_bye(conn->session, GNUTLS_SHUT_WR);
-    switch (error)
-    {
-      case GNUTLS_E_SUCCESS:
-       cupsdLogMessage(CUPSD_LOG_INFO,
-                       "cupsdCloseClient: SSL shutdown successful!");
-       break;
-      default:
-       cupsdLogMessage(CUPSD_LOG_ERROR,
-                       "cupsdCloseClient: %s", gnutls_strerror(error));
-       break;
-    }
-
-    gnutls_deinit(conn->session);
-    gnutls_certificate_free_credentials(*credentials);
-    free(credentials);
-    free(conn);
-
-#  elif defined(HAVE_CDSASSL)
-    conn = (http_tls_t *)(con->http.tls);
-
-    while (SSLClose(conn->session) == errSSLWouldBlock)
-      usleep(1000);
-
-    SSLDisposeContext(conn->session);
-
-    if (conn->certsArray)
-      CFRelease(conn->certsArray);
-
-    free(conn);
-#  endif /* HAVE_LIBSSL */
-
-    con->http.tls = NULL;
+    cupsdEndTLS(con);
   }
 #endif /* HAVE_SSL */
 
@@ -561,26 +565,13 @@ cupsdCloseClient(cupsd_client_t *con)     /* I - Client to close */
     * Stop any CGI process...
     */
 
-    cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                    "cupsdCloseClient: %d Killing process ID %d...",
-                    con->http.fd, con->pipe_pid);
     cupsdEndProcess(con->pipe_pid, 1);
     con->pipe_pid = 0;
   }
 
   if (con->file >= 0)
   {
-    if (FD_ISSET(con->file, InputSet))
-    {
-      cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                      "cupsdCloseClient: %d Removing fd %d from InputSet...",
-                     con->http.fd, con->file);
-      FD_CLR(con->file, InputSet);
-    }
-
-    cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                    "cupsdCloseClient: %d Closing data file %d.",
-                    con->http.fd, con->file);
+    cupsdRemoveSelect(con->file);
 
     close(con->file);
     con->file = -1;
@@ -590,19 +581,19 @@ cupsdCloseClient(cupsd_client_t *con)     /* I - Client to close */
   * Close the socket and clear the file from the input set for select()...
   */
 
-  if (con->http.fd > 0)
+  if (con->http.fd >= 0)
   {
+    cupsArrayRemove(ActiveClients, con);
+    cupsdSetBusyState();
+
     if (partial)
     {
      /*
       * Only do a partial close so that the encrypted client gets everything.
       */
 
-      cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                      "cupsdCloseClient: Removing fd %d from OutputSet...",
-                     con->http.fd);
       shutdown(con->http.fd, 0);
-      FD_CLR(con->http.fd, OutputSet);
+      cupsdAddSelect(con->http.fd, (cupsd_selfunc_t)cupsdReadClient, NULL, con);
     }
     else
     {
@@ -610,12 +601,8 @@ cupsdCloseClient(cupsd_client_t *con)      /* I - Client to close */
       * Shut the socket down fully...
       */
 
-      cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                      "cupsdCloseClient: Removing fd %d from InputSet and OutputSet...",
-                     con->http.fd);
+      cupsdRemoveSelect(con->http.fd);
       close(con->http.fd);
-      FD_CLR(con->http.fd, InputSet);
-      FD_CLR(con->http.fd, OutputSet);
       con->http.fd = -1;
     }
   }
@@ -630,10 +617,12 @@ cupsdCloseClient(cupsd_client_t *con)     /* I - Client to close */
       free(con->http.input_set);
 
     httpClearCookie(HTTP(con));
+    httpClearFields(HTTP(con));
 
     cupsdClearString(&con->filename);
     cupsdClearString(&con->command);
     cupsdClearString(&con->options);
+    cupsdClearString(&con->query_string);
 
     if (con->request)
     {
@@ -653,6 +642,14 @@ cupsdCloseClient(cupsd_client_t *con)      /* I - Client to close */
       con->language = NULL;
     }
 
+#ifdef HAVE_AUTHORIZATION_H
+    if (con->authref)
+    {
+      AuthorizationFree(con->authref, kAuthorizationFlagDefaults);
+      con->authref = NULL;
+    }
+#endif /* HAVE_AUTHORIZATION_H */
+
    /*
     * Re-enable new client connections if we are going back under the
     * limit...
@@ -678,12 +675,14 @@ cupsdCloseClient(cupsd_client_t *con)     /* I - Client to close */
  * 'cupsdFlushHeader()' - Flush the header fields to the client.
  */
 
-void
+int                                    /* I - Bytes written or -1 on error */
 cupsdFlushHeader(cupsd_client_t *con)  /* I - Client to flush to */
 {
-  httpFlushWrite(HTTP(con));
+  int bytes = httpFlushWrite(HTTP(con));
+
+  con->http.data_encoding = HTTP_ENCODING_LENGTH;
 
-  con->http.data_encoding = HTTP_ENCODE_LENGTH;
+  return (bytes);
 }
 
 
@@ -691,7 +690,7 @@ cupsdFlushHeader(cupsd_client_t *con)       /* I - Client to flush to */
  * 'cupsdReadClient()' - Read data from a client.
  */
 
-int                                    /* O - 1 on success, 0 on error */
+void
 cupsdReadClient(cupsd_client_t *con)   /* I - Client to read from */
 {
   char                 line[32768],    /* Line from client... */
@@ -714,14 +713,22 @@ cupsdReadClient(cupsd_client_t *con)      /* I - Client to read from */
   status = HTTP_CONTINUE;
 
   cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                  "cupsdReadClient: %d, used=%d, file=%d state=%d",
-                  con->http.fd, con->http.used, con->file, con->http.state);
-
-  if (con->http.error)
-  {
-    cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdReadClient: http error seen...");
-    return (cupsdCloseClient(con));
-  }
+                 "[Client %d] cupsdReadClient "
+                 "error=%d, "
+                 "used=%d, "
+                 "state=%s, "
+                 "data_encoding=HTTP_ENCODING_%s, "
+                 "data_remaining=" CUPS_LLFMT ", "
+                 "request=%p(%s), "
+                 "file=%d",
+                 con->http.fd, con->http.error, con->http.used,
+                 http_states[con->http.state + 1],
+                 con->http.data_encoding == HTTP_ENCODING_CHUNKED ?
+                     "CHUNKED" : "LENGTH",
+                 CUPS_LLCAST con->http.data_remaining,
+                 con->request,
+                 con->request ? ipp_states[con->request->state] : "",
+                 con->file);
 
 #ifdef HAVE_SSL
   if (con->auto_ssl)
@@ -740,27 +747,38 @@ cupsdReadClient(cupsd_client_t *con)      /* I - Client to read from */
       */
 
       cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                      "cupsdReadClient: Saw first byte %02X, auto-negotiating SSL/TLS session...",
-                      buf[0] & 255);
+                      "[Client %d] Saw first byte %02X, auto-negotiating "
+                     "SSL/TLS session.", con->http.fd, buf[0] & 255);
 
-      encrypt_client(con);
-      return (1);
+      if (!cupsdStartTLS(con))
+        cupsdCloseClient(con);
+
+      return;
     }
   }
 #endif /* HAVE_SSL */
 
   switch (con->http.state)
   {
-    case HTTP_WAITING :
+    case HTTP_STATE_WAITING :
        /*
         * See if we've received a request line...
        */
 
         if (httpGets(line, sizeof(line) - 1, HTTP(con)) == NULL)
        {
-         cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                         "cupsdReadClient: httpGets returned EOF...");
-          return (cupsdCloseClient(con));
+         if (con->http.error && con->http.error != EPIPE)
+           cupsdLogMessage(CUPSD_LOG_DEBUG,
+                           "[Client %d] HTTP_STATE_WAITING Closing for error %d "
+                           "(%s)", con->http.fd, con->http.error,
+                           strerror(con->http.error));
+         else
+           cupsdLogMessage(CUPSD_LOG_DEBUG,
+                           "[Client %d] HTTP_STATE_WAITING Closing on EOF",
+                           con->http.fd);
+
+         cupsdCloseClient(con);
+         return;
        }
 
        /*
@@ -779,10 +797,10 @@ cupsdReadClient(cupsd_client_t *con)      /* I - Client to read from */
         con->http.activity        = time(NULL);
         con->http.version         = HTTP_1_0;
        con->http.keep_alive      = HTTP_KEEPALIVE_OFF;
-       con->http.data_encoding   = HTTP_ENCODE_LENGTH;
+       con->http.data_encoding   = HTTP_ENCODING_LENGTH;
        con->http.data_remaining  = 0;
        con->http._data_remaining = 0;
-       con->operation            = HTTP_WAITING;
+       con->operation            = HTTP_STATE_WAITING;
        con->bytes                = 0;
        con->file                 = -1;
        con->file_ready           = 0;
@@ -793,13 +811,31 @@ cupsdReadClient(cupsd_client_t *con)      /* I - Client to read from */
 
        cupsdClearString(&con->command);
        cupsdClearString(&con->options);
+       cupsdClearString(&con->query_string);
+
+       if (con->request)
+       {
+         ippDelete(con->request);
+         con->request = NULL;
+       }
 
-       if (con->language != NULL)
+       if (con->response)
+       {
+         ippDelete(con->response);
+         con->response = NULL;
+       }
+
+       if (con->language)
        {
          cupsLangFree(con->language);
          con->language = NULL;
        }
 
+#ifdef HAVE_GSSAPI
+        con->have_gss = 0;
+       con->gss_uid  = 0;
+#endif /* HAVE_GSSAPI */
+
        /*
         * Grab the request line...
        */
@@ -807,11 +843,17 @@ cupsdReadClient(cupsd_client_t *con)      /* I - Client to read from */
         switch (sscanf(line, "%63s%1023s%63s", operation, con->uri, version))
        {
          case 1 :
-             cupsdLogMessage(CUPSD_LOG_ERROR,
-                             "Bad request line \"%s\" from %s!", line,
-                             con->http.hostname);
-             cupsdSendError(con, HTTP_BAD_REQUEST);
-             return (cupsdCloseClient(con));
+             if (line[0])
+             {
+               cupsdLogMessage(CUPSD_LOG_ERROR,
+                               "[Client %d] Bad request line \"%s\" from %s.",
+                               con->http.fd,
+                               _httpEncodeURI(buf, line, sizeof(buf)),
+                               con->http.hostname);
+               cupsdSendError(con, HTTP_BAD_REQUEST, CUPSD_AUTH_NONE);
+               cupsdCloseClient(con);
+              }
+             return;
          case 2 :
              con->http.version = HTTP_0_9;
              break;
@@ -819,10 +861,13 @@ cupsdReadClient(cupsd_client_t *con)      /* I - Client to read from */
              if (sscanf(version, "HTTP/%d.%d", &major, &minor) != 2)
              {
                cupsdLogMessage(CUPSD_LOG_ERROR,
-                               "Bad request line \"%s\" from %s!", line,
+                               "[Client %d] Bad request line \"%s\" from %s.",
+                               con->http.fd,
+                               _httpEncodeURI(buf, line, sizeof(buf)),
                                con->http.hostname);
-               cupsdSendError(con, HTTP_BAD_REQUEST);
-               return (cupsdCloseClient(con));
+               cupsdSendError(con, HTTP_BAD_REQUEST, CUPSD_AUTH_NONE);
+               cupsdCloseClient(con);
+               return;
              }
 
              if (major < 2)
@@ -835,8 +880,14 @@ cupsdReadClient(cupsd_client_t *con)       /* I - Client to read from */
              }
              else
              {
-               cupsdSendError(con, HTTP_NOT_SUPPORTED);
-               return (cupsdCloseClient(con));
+               cupsdLogMessage(CUPSD_LOG_ERROR,
+                               "[Client %d] Unsupported request line \"%s\" "
+                               "from %s.", con->http.fd,
+                               _httpEncodeURI(buf, line, sizeof(buf)),
+                               con->http.hostname);
+               cupsdSendError(con, HTTP_NOT_SUPPORTED, CUPSD_AUTH_NONE);
+               cupsdCloseClient(con);
+               return;
              }
              break;
        }
@@ -847,7 +898,7 @@ cupsdReadClient(cupsd_client_t *con)        /* I - Client to read from */
 
         if (strcmp(con->uri, "*"))
        {
-         char  method[HTTP_MAX_URI],   /* Method/scheme */
+         char  scheme[HTTP_MAX_URI],   /* Method/scheme */
                userpass[HTTP_MAX_URI], /* Username:password */
                hostname[HTTP_MAX_URI], /* Hostname */
                resource[HTTP_MAX_URI]; /* Resource path */
@@ -859,7 +910,7 @@ cupsdReadClient(cupsd_client_t *con)        /* I - Client to read from */
          */
 
           httpSeparateURI(HTTP_URI_CODING_MOST, con->uri,
-                         method, sizeof(method),
+                         scheme, sizeof(scheme),
                          userpass, sizeof(userpass),
                          hostname, sizeof(hostname), &port,
                          resource, sizeof(resource));
@@ -869,19 +920,21 @@ cupsdReadClient(cupsd_client_t *con)      /* I - Client to read from */
          * address...
          */
 
-         if (strcmp(method, "file") &&
-             strcasecmp(hostname, ServerName) &&
-             strcasecmp(hostname, "localhost") &&
-             !isdigit(hostname[0]))
+         if (strcmp(scheme, "file") &&
+             _cups_strcasecmp(hostname, ServerName) &&
+             _cups_strcasecmp(hostname, "localhost") &&
+             !isdigit(hostname[0]) && hostname[0] != '[')
          {
           /*
            * Nope, we don't do proxies...
            */
 
-           cupsdLogMessage(CUPSD_LOG_ERROR, "Bad URI \"%s\" in request!",
-                           con->uri);
-           cupsdSendError(con, HTTP_METHOD_NOT_ALLOWED);
-           return (cupsdCloseClient(con));
+           cupsdLogMessage(CUPSD_LOG_ERROR,
+                           "[Client %d] Bad URI \"%s\" in request.",
+                           con->http.fd, con->uri);
+           cupsdSendError(con, HTTP_METHOD_NOT_ALLOWED, CUPSD_AUTH_NONE);
+           cupsdCloseClient(con);
+           return;
          }
 
          /*
@@ -889,7 +942,7 @@ cupsdReadClient(cupsd_client_t *con)        /* I - Client to read from */
          * con->uri are HTTP_MAX_URI bytes in size...
          */
 
-          strcpy(con->uri, resource);
+          strlcpy(con->uri, resource, sizeof(con->uri));
        }
 
        /*
@@ -897,56 +950,90 @@ cupsdReadClient(cupsd_client_t *con)      /* I - Client to read from */
        */
 
         if (!strcmp(operation, "GET"))
-         con->http.state = HTTP_GET;
+         con->http.state = HTTP_STATE_GET;
         else if (!strcmp(operation, "PUT"))
-         con->http.state = HTTP_PUT;
+         con->http.state = HTTP_STATE_PUT;
         else if (!strcmp(operation, "POST"))
-         con->http.state = HTTP_POST;
+         con->http.state = HTTP_STATE_POST;
         else if (!strcmp(operation, "DELETE"))
-         con->http.state = HTTP_DELETE;
+         con->http.state = HTTP_STATE_DELETE;
         else if (!strcmp(operation, "TRACE"))
-         con->http.state = HTTP_TRACE;
+         con->http.state = HTTP_STATE_TRACE;
         else if (!strcmp(operation, "OPTIONS"))
-         con->http.state = HTTP_OPTIONS;
+         con->http.state = HTTP_STATE_OPTIONS;
         else if (!strcmp(operation, "HEAD"))
-         con->http.state = HTTP_HEAD;
+         con->http.state = HTTP_STATE_HEAD;
        else
        {
-         cupsdLogMessage(CUPSD_LOG_ERROR, "Bad operation \"%s\"!", operation);
-         cupsdSendError(con, HTTP_BAD_REQUEST);
-         return (cupsdCloseClient(con));
+         cupsdLogMessage(CUPSD_LOG_ERROR,
+                         "[Client %d] Bad operation \"%s\".", con->http.fd,
+                         operation);
+         cupsdSendError(con, HTTP_BAD_REQUEST, CUPSD_AUTH_NONE);
+         cupsdCloseClient(con);
+         return;
        }
 
-        con->start     = time(NULL);
+        gettimeofday(&(con->start), NULL);
         con->operation = con->http.state;
 
-        cupsdLogMessage(CUPSD_LOG_DEBUG, "cupsdReadClient: %d %s %s HTTP/%d.%d",
+        cupsdLogMessage(CUPSD_LOG_DEBUG, "[Client %d] %s %s HTTP/%d.%d",
                        con->http.fd, operation, con->uri,
                        con->http.version / 100, con->http.version % 100);
 
        con->http.status = HTTP_OK;
 
-    case HTTP_OPTIONS :
-    case HTTP_DELETE :
-    case HTTP_GET :
-    case HTTP_HEAD :
-    case HTTP_POST :
-    case HTTP_PUT :
-    case HTTP_TRACE :
+        if (!cupsArrayFind(ActiveClients, con))
+       {
+         cupsArrayAdd(ActiveClients, con);
+          cupsdSetBusyState();
+        }
+
+    case HTTP_STATE_OPTIONS :
+    case HTTP_STATE_DELETE :
+    case HTTP_STATE_GET :
+    case HTTP_STATE_HEAD :
+    case HTTP_STATE_POST :
+    case HTTP_STATE_PUT :
+    case HTTP_STATE_TRACE :
        /*
         * Parse incoming parameters until the status changes...
        */
 
-        status = httpUpdate(HTTP(con));
+        while ((status = httpUpdate(HTTP(con))) == HTTP_CONTINUE)
+         if (!data_ready(con))
+           break;
 
        if (status != HTTP_OK && status != HTTP_CONTINUE)
        {
-         cupsdSendError(con, HTTP_BAD_REQUEST);
-         return (cupsdCloseClient(con));
+         if (con->http.error && con->http.error != EPIPE)
+           cupsdLogMessage(CUPSD_LOG_DEBUG,
+                           "[Client %d] Closing for error %d (%s) while "
+                           "reading headers.",
+                           con->http.fd, con->http.error,
+                           strerror(con->http.error));
+         else
+           cupsdLogMessage(CUPSD_LOG_DEBUG,
+                           "[Client %d] Closing on EOF while reading headers.",
+                           con->http.fd);
+
+         cupsdSendError(con, HTTP_BAD_REQUEST, CUPSD_AUTH_NONE);
+         cupsdCloseClient(con);
+         return;
        }
        break;
 
     default :
+        if (!data_ready(con) && recv(con->http.fd, buf, 1, MSG_PEEK) < 1)
+       {
+        /*
+         * Connection closed...
+         */
+
+         cupsdLogMessage(CUPSD_LOG_DEBUG,
+                         "[Client %d] Closing on EOF", con->http.fd);
+          cupsdCloseClient(con);
+         return;
+       }
         break; /* Anti-compiler-warning-code */
   }
 
@@ -963,13 +1050,16 @@ cupsdReadClient(cupsd_client_t *con)     /* I - Client to read from */
       * fields...
       */
 
-      if ((ptr = strchr(con->http.fields[HTTP_FIELD_ACCEPT_LANGUAGE], ',')) != NULL)
+      if ((ptr = strchr(con->http.fields[HTTP_FIELD_ACCEPT_LANGUAGE],
+                        ',')) != NULL)
         *ptr = '\0';
 
-      if ((ptr = strchr(con->http.fields[HTTP_FIELD_ACCEPT_LANGUAGE], ';')) != NULL)
+      if ((ptr = strchr(con->http.fields[HTTP_FIELD_ACCEPT_LANGUAGE],
+                        ';')) != NULL)
         *ptr = '\0';
 
-      if ((ptr = strstr(con->http.fields[HTTP_FIELD_CONTENT_TYPE], "charset=")) != NULL)
+      if ((ptr = strstr(con->http.fields[HTTP_FIELD_CONTENT_TYPE],
+                        "charset=")) != NULL)
       {
        /*
         * Combine language and charset, and trim any extra params in the
@@ -983,12 +1073,8 @@ cupsdReadClient(cupsd_client_t *con)      /* I - Client to read from */
          *ptr = '\0';
       }
       else
-        snprintf(locale, sizeof(locale), "%s.%s",
-                con->http.fields[HTTP_FIELD_ACCEPT_LANGUAGE], DefaultCharset);
-
-      cupsdLogMessage(CUPSD_LOG_DEBUG,
-                      "cupsdReadClient: %d Browser asked for language \"%s\"...",
-                      con->http.fd, locale);
+        snprintf(locale, sizeof(locale), "%s.UTF-8",
+                con->http.fields[HTTP_FIELD_ACCEPT_LANGUAGE]);
 
       con->language = cupsLangGet(locale);
     }
@@ -997,9 +1083,12 @@ cupsdReadClient(cupsd_client_t *con)      /* I - Client to read from */
 
     cupsdAuthorize(con);
 
-    if (!strncmp(con->http.fields[HTTP_FIELD_CONNECTION], "Keep-Alive", 10) &&
-        KeepAlive)
+    if (!_cups_strncasecmp(con->http.fields[HTTP_FIELD_CONNECTION],
+                           "Keep-Alive", 10) && KeepAlive)
       con->http.keep_alive = HTTP_KEEPALIVE_ON;
+    else if (!_cups_strncasecmp(con->http.fields[HTTP_FIELD_CONNECTION],
+                                "close", 5))
+      con->http.keep_alive = HTTP_KEEPALIVE_OFF;
 
     if (!con->http.fields[HTTP_FIELD_HOST][0] &&
         con->http.version >= HTTP_1_1)
@@ -1008,22 +1097,49 @@ cupsdReadClient(cupsd_client_t *con)    /* I - Client to read from */
       * HTTP/1.1 and higher require the "Host:" field...
       */
 
-      if (!cupsdSendError(con, HTTP_BAD_REQUEST))
-       return (cupsdCloseClient(con));
+      if (!cupsdSendError(con, HTTP_BAD_REQUEST, CUPSD_AUTH_NONE))
+      {
+        cupsdLogMessage(CUPSD_LOG_ERROR,
+                        "[Client %d] Missing Host: field in request.",
+                        con->http.fd);
+       cupsdCloseClient(con);
+       return;
+      }
+    }
+    else if (!valid_host(con))
+    {
+     /*
+      * Access to localhost must use "localhost" or the corresponding IPv4
+      * or IPv6 values in the Host: field.
+      */
+
+      cupsdLogMessage(CUPSD_LOG_ERROR,
+                      "[Client %d] Request from \"%s\" using invalid Host: "
+                      "field \"%s\"", con->http.fd, con->http.hostname,
+                      con->http.fields[HTTP_FIELD_HOST]);
+
+      if (!cupsdSendError(con, HTTP_BAD_REQUEST, CUPSD_AUTH_NONE))
+      {
+       cupsdCloseClient(con);
+       return;
+      }
     }
-    else if (con->operation == HTTP_OPTIONS)
+    else if (con->operation == HTTP_STATE_OPTIONS)
     {
      /*
       * Do OPTIONS command...
       */
 
-      if (con->best && con->best->type != AUTH_NONE)
+      if (con->best && con->best->type != CUPSD_AUTH_NONE)
       {
-       if (!cupsdSendHeader(con, HTTP_UNAUTHORIZED, NULL))
-         return (cupsdCloseClient(con));
+       if (!cupsdSendHeader(con, HTTP_UNAUTHORIZED, NULL, CUPSD_AUTH_NONE))
+       {
+         cupsdCloseClient(con);
+         return;
+       }
       }
 
-      if (!strcasecmp(con->http.fields[HTTP_FIELD_CONNECTION], "Upgrade") &&
+      if (!_cups_strcasecmp(con->http.fields[HTTP_FIELD_CONNECTION], "Upgrade") &&
          con->http.tls == NULL)
       {
 #ifdef HAVE_SSL
@@ -1031,29 +1147,52 @@ cupsdReadClient(cupsd_client_t *con)    /* I - Client to read from */
         * Do encryption stuff...
        */
 
-       if (!cupsdSendHeader(con, HTTP_SWITCHING_PROTOCOLS, NULL))
-         return (cupsdCloseClient(con));
+       if (!cupsdSendHeader(con, HTTP_SWITCHING_PROTOCOLS, NULL, CUPSD_AUTH_NONE))
+       {
+         cupsdCloseClient(con);
+         return;
+       }
 
        httpPrintf(HTTP(con), "Connection: Upgrade\r\n");
-       httpPrintf(HTTP(con), "Upgrade: TLS/1.0,HTTP/1.1\r\n");
+       httpPrintf(HTTP(con), "Upgrade: TLS/1.2,TLS/1.1,TLS/1.0\r\n");
        httpPrintf(HTTP(con), "Content-Length: 0\r\n");
        httpPrintf(HTTP(con), "\r\n");
-       cupsdFlushHeader(con);
 
-        encrypt_client(con);
+       if (cupsdFlushHeader(con) < 0)
+        {
+         cupsdCloseClient(con);
+         return;
+       }
+
+        if (!cupsdStartTLS(con))
+        {
+         cupsdCloseClient(con);
+         return;
+       }
 #else
-       if (!cupsdSendError(con, HTTP_NOT_IMPLEMENTED))
-         return (cupsdCloseClient(con));
+       if (!cupsdSendError(con, HTTP_NOT_IMPLEMENTED, CUPSD_AUTH_NONE))
+       {
+         cupsdCloseClient(con);
+         return;
+       }
 #endif /* HAVE_SSL */
       }
 
-      if (!cupsdSendHeader(con, HTTP_OK, NULL))
-       return (cupsdCloseClient(con));
+      if (!cupsdSendHeader(con, HTTP_OK, NULL, CUPSD_AUTH_NONE))
+      {
+       cupsdCloseClient(con);
+       return;
+      }
 
       httpPrintf(HTTP(con), "Allow: GET, HEAD, OPTIONS, POST, PUT\r\n");
       httpPrintf(HTTP(con), "Content-Length: 0\r\n");
       httpPrintf(HTTP(con), "\r\n");
-      cupsdFlushHeader(con);
+
+      if (cupsdFlushHeader(con) < 0)
+      {
+       cupsdCloseClient(con);
+       return;
+      }
     }
     else if (!is_path_absolute(con->uri))
     {
@@ -1061,46 +1200,67 @@ cupsdReadClient(cupsd_client_t *con)    /* I - Client to read from */
       * Protect against malicious users!
       */
 
-      if (!cupsdSendError(con, HTTP_FORBIDDEN))
-       return (cupsdCloseClient(con));
+      cupsdLogMessage(CUPSD_LOG_ERROR,
+                      "[Client %d] Request for non-absolute resource \"%s\".",
+                      con->http.fd, con->uri);
+
+      if (!cupsdSendError(con, HTTP_FORBIDDEN, CUPSD_AUTH_NONE))
+      {
+       cupsdCloseClient(con);
+       return;
+      }
     }
     else
     {
-      if (!strcasecmp(con->http.fields[HTTP_FIELD_CONNECTION], "Upgrade") &&
-         con->http.tls == NULL)
+      if (!_cups_strcasecmp(con->http.fields[HTTP_FIELD_CONNECTION],
+                            "Upgrade") && con->http.tls == NULL)
       {
 #ifdef HAVE_SSL
        /*
         * Do encryption stuff...
        */
 
-       if (!cupsdSendHeader(con, HTTP_SWITCHING_PROTOCOLS, NULL))
-         return (cupsdCloseClient(con));
+       if (!cupsdSendHeader(con, HTTP_SWITCHING_PROTOCOLS, NULL,
+                            CUPSD_AUTH_NONE))
+       {
+         cupsdCloseClient(con);
+         return;
+       }
 
        httpPrintf(HTTP(con), "Connection: Upgrade\r\n");
-       httpPrintf(HTTP(con), "Upgrade: TLS/1.0,HTTP/1.1\r\n");
+       httpPrintf(HTTP(con), "Upgrade: TLS/1.2,TLS/1.1,TLS/1.0\r\n");
        httpPrintf(HTTP(con), "Content-Length: 0\r\n");
        httpPrintf(HTTP(con), "\r\n");
-       cupsdFlushHeader(con);
 
-        encrypt_client(con);
+       if (cupsdFlushHeader(con) < 0)
+        {
+         cupsdCloseClient(con);
+         return;
+       }
+
+        if (!cupsdStartTLS(con))
+        {
+         cupsdCloseClient(con);
+         return;
+       }
 #else
-       if (!cupsdSendError(con, HTTP_NOT_IMPLEMENTED))
-         return (cupsdCloseClient(con));
+       if (!cupsdSendError(con, HTTP_NOT_IMPLEMENTED, CUPSD_AUTH_NONE))
+       {
+         cupsdCloseClient(con);
+         return;
+       }
 #endif /* HAVE_SSL */
       }
 
       if ((status = cupsdIsAuthorized(con, NULL)) != HTTP_OK)
       {
-        cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                       "cupsdReadClient: Unauthorized request for %s...\n",
-                       con->uri);
-       cupsdSendError(con, status);
-       return (cupsdCloseClient(con));
+       cupsdSendError(con, status, CUPSD_AUTH_NONE);
+       cupsdCloseClient(con);
+       return;
       }
 
       if (con->http.expect &&
-          (con->operation == HTTP_POST || con->operation == HTTP_PUT))
+          (con->operation == HTTP_STATE_POST || con->operation == HTTP_STATE_PUT))
       {
         if (con->http.expect == HTTP_CONTINUE)
        {
@@ -1108,8 +1268,11 @@ cupsdReadClient(cupsd_client_t *con)     /* I - Client to read from */
          * Send 100-continue header...
          */
 
-         if (!cupsdSendHeader(con, HTTP_CONTINUE, NULL))
-           return (cupsdCloseClient(con));
+         if (!cupsdSendHeader(con, HTTP_CONTINUE, NULL, CUPSD_AUTH_NONE))
+         {
+           cupsdCloseClient(con);
+           return;
+         }
        }
        else
        {
@@ -1117,19 +1280,30 @@ cupsdReadClient(cupsd_client_t *con)    /* I - Client to read from */
          * Send 417-expectation-failed header...
          */
 
-         if (!cupsdSendHeader(con, HTTP_EXPECTATION_FAILED, NULL))
-           return (cupsdCloseClient(con));
+         if (!cupsdSendHeader(con, HTTP_EXPECTATION_FAILED, NULL,
+                              CUPSD_AUTH_NONE))
+         {
+           cupsdCloseClient(con);
+           return;
+         }
 
          httpPrintf(HTTP(con), "Content-Length: 0\r\n");
          httpPrintf(HTTP(con), "\r\n");
-         cupsdFlushHeader(con);
+
+         if (cupsdFlushHeader(con) < 0)
+          {
+           cupsdCloseClient(con);
+           return;
+         }
        }
       }
 
       switch (con->http.state)
       {
-       case HTTP_GET_SEND :
-            if (!strncmp(con->uri, "/printers/", 10) &&
+       case HTTP_STATE_GET_SEND :
+            if ((!strncmp(con->uri, "/ppd/", 5) ||
+                !strncmp(con->uri, "/printers/", 10) ||
+                !strncmp(con->uri, "/classes/", 9)) &&
                !strcmp(con->uri + strlen(con->uri) - 4, ".ppd"))
            {
             /*
@@ -1139,35 +1313,145 @@ cupsdReadClient(cupsd_client_t *con)   /* I - Client to read from */
 
               con->uri[strlen(con->uri) - 4] = '\0';   /* Drop ".ppd" */
 
-              if ((p = cupsdFindPrinter(con->uri + 10)) != NULL)
+             if (!strncmp(con->uri, "/ppd/", 5))
+               p = cupsdFindPrinter(con->uri + 5);
+             else if (!strncmp(con->uri, "/printers/", 10))
+               p = cupsdFindPrinter(con->uri + 10);
+             else
+             {
+               p = cupsdFindClass(con->uri + 9);
+
+               if (p)
+               {
+                 int i;                /* Looping var */
+
+                 for (i = 0; i < p->num_printers; i ++)
+                 {
+                   if (!(p->printers[i]->type & CUPS_PRINTER_CLASS))
+                   {
+                     char ppdname[1024];/* PPD filename */
+
+                     snprintf(ppdname, sizeof(ppdname), "%s/ppd/%s.ppd",
+                              ServerRoot, p->printers[i]->name);
+                     if (!access(ppdname, 0))
+                     {
+                       p = p->printers[i];
+                       break;
+                     }
+                   }
+                 }
+
+                  if (i >= p->num_printers)
+                    p = NULL;
+               }
+             }
+
+             if (p)
+             {
                snprintf(con->uri, sizeof(con->uri), "/ppd/%s.ppd", p->name);
+             }
              else
              {
-               if (!cupsdSendError(con, HTTP_NOT_FOUND))
-                 return (cupsdCloseClient(con));
+               if (!cupsdSendError(con, HTTP_NOT_FOUND, CUPSD_AUTH_NONE))
+               {
+                 cupsdCloseClient(con);
+                 return;
+               }
 
                break;
              }
            }
-
-           if ((!strncmp(con->uri, "/admin", 6) &&
-                strncmp(con->uri, "/admin/conf/", 12) &&
-                strncmp(con->uri, "/admin/log/", 11)) ||
-               !strncmp(con->uri, "/printers", 9) ||
-               !strncmp(con->uri, "/classes", 8) ||
-               !strncmp(con->uri, "/help", 5) ||
-               !strncmp(con->uri, "/jobs", 5))
+            else if ((!strncmp(con->uri, "/icons/", 7) ||
+                     !strncmp(con->uri, "/printers/", 10) ||
+                     !strncmp(con->uri, "/classes/", 9)) &&
+                    !strcmp(con->uri + strlen(con->uri) - 4, ".png"))
            {
             /*
-             * Send CGI output...
+             * Send icon file - get the real queue name since queue names are
+             * not case sensitive but filenames can be...
              */
 
-              if (!strncmp(con->uri, "/admin", 6))
-             {
-               cupsdSetStringf(&con->command, "%s/cgi-bin/admin.cgi",
-                               ServerBin);
+             con->uri[strlen(con->uri) - 4] = '\0';    /* Drop ".png" */
 
-               cupsdSetString(&con->options, strchr(con->uri + 6, '?'));
+              if (!strncmp(con->uri, "/icons/", 7))
+                p = cupsdFindPrinter(con->uri + 7);
+              else if (!strncmp(con->uri, "/printers/", 10))
+                p = cupsdFindPrinter(con->uri + 10);
+              else
+              {
+               p = cupsdFindClass(con->uri + 9);
+
+               if (p)
+               {
+                 int i;                /* Looping var */
+
+                 for (i = 0; i < p->num_printers; i ++)
+                 {
+                   if (!(p->printers[i]->type & CUPS_PRINTER_CLASS))
+                   {
+                     char ppdname[1024];/* PPD filename */
+
+                     snprintf(ppdname, sizeof(ppdname), "%s/ppd/%s.ppd",
+                              ServerRoot, p->printers[i]->name);
+                     if (!access(ppdname, 0))
+                     {
+                       p = p->printers[i];
+                       break;
+                     }
+                   }
+                 }
+
+                  if (i >= p->num_printers)
+                    p = NULL;
+               }
+             }
+
+              if (p)
+               snprintf(con->uri, sizeof(con->uri), "/icons/%s.png", p->name);
+             else
+             {
+               if (!cupsdSendError(con, HTTP_NOT_FOUND, CUPSD_AUTH_NONE))
+               {
+                 cupsdCloseClient(con);
+                 return;
+               }
+
+               break;
+             }
+           }
+           else if (!WebInterface)
+           {
+            /*
+             * Web interface is disabled. Show an appropriate message...
+             */
+
+             if (!cupsdSendError(con, HTTP_WEBIF_DISABLED, CUPSD_AUTH_NONE))
+             {
+               cupsdCloseClient(con);
+               return;
+             }
+
+             break;
+           }
+
+           if ((!strncmp(con->uri, "/admin", 6) &&
+                 strncmp(con->uri, "/admin/conf/", 12) &&
+                 strncmp(con->uri, "/admin/log/", 11)) ||
+                !strncmp(con->uri, "/printers", 9) ||
+                !strncmp(con->uri, "/classes", 8) ||
+                !strncmp(con->uri, "/help", 5) ||
+                !strncmp(con->uri, "/jobs", 5))
+           {
+            /*
+             * Send CGI output...
+             */
+
+              if (!strncmp(con->uri, "/admin", 6))
+             {
+               cupsdSetStringf(&con->command, "%s/cgi-bin/admin.cgi",
+                               ServerBin);
+
+               cupsdSetString(&con->options, strchr(con->uri + 6, '?'));
              }
               else if (!strncmp(con->uri, "/printers", 9))
              {
@@ -1212,8 +1496,11 @@ cupsdReadClient(cupsd_client_t *con)     /* I - Client to read from */
 
               if (!cupsdSendCommand(con, con->command, con->options, 0))
              {
-               if (!cupsdSendError(con, HTTP_NOT_FOUND))
-                 return (cupsdCloseClient(con));
+               if (!cupsdSendError(con, HTTP_NOT_FOUND, CUPSD_AUTH_NONE))
+               {
+                 cupsdCloseClient(con);
+                 return;
+               }
               }
              else
                cupsdLogRequest(con, HTTP_OK);
@@ -1229,12 +1516,18 @@ cupsdReadClient(cupsd_client_t *con)    /* I - Client to read from */
                       strlen(con->uri) == 11)))
            {
             /*
-             * GET can only be done to configuration files under
+             * GET can only be done to configuration files directly under
              * /admin/conf...
              */
 
-             if (!cupsdSendError(con, HTTP_FORBIDDEN))
-               return (cupsdCloseClient(con));
+             cupsdLogMessage(CUPSD_LOG_ERROR,
+                             "Request for subdirectory \"%s\"!", con->uri);
+
+             if (!cupsdSendError(con, HTTP_FORBIDDEN, CUPSD_AUTH_NONE))
+             {
+               cupsdCloseClient(con);
+               return;
+             }
 
              break;
            }
@@ -1247,8 +1540,11 @@ cupsdReadClient(cupsd_client_t *con)     /* I - Client to read from */
               if ((filename = get_file(con, &filestats, buf,
                                       sizeof(buf))) == NULL)
              {
-               if (!cupsdSendError(con, HTTP_NOT_FOUND))
-                 return (cupsdCloseClient(con));
+               if (!cupsdSendError(con, HTTP_NOT_FOUND, CUPSD_AUTH_NONE))
+               {
+                 cupsdCloseClient(con);
+                 return;
+               }
 
                break;
              }
@@ -1264,8 +1560,11 @@ cupsdReadClient(cupsd_client_t *con)     /* I - Client to read from */
 
                if (!cupsdSendCommand(con, con->command, con->options, 0))
                {
-                 if (!cupsdSendError(con, HTTP_NOT_FOUND))
-                   return (cupsdCloseClient(con));
+                 if (!cupsdSendError(con, HTTP_NOT_FOUND, CUPSD_AUTH_NONE))
+                 {
+                   cupsdCloseClient(con);
+                   return;
+                 }
                }
                else
                  cupsdLogRequest(con, HTTP_OK);
@@ -1277,32 +1576,34 @@ cupsdReadClient(cupsd_client_t *con)    /* I - Client to read from */
 
              if (!check_if_modified(con, &filestats))
               {
-               if (!cupsdSendError(con, HTTP_NOT_MODIFIED))
-                 return (cupsdCloseClient(con));
+               if (!cupsdSendError(con, HTTP_NOT_MODIFIED, CUPSD_AUTH_NONE))
+               {
+                 cupsdCloseClient(con);
+                 return;
+               }
              }
              else
               {
                if (type == NULL)
-                 strcpy(line, "text/plain");
+                 strlcpy(line, "text/plain", sizeof(line));
                else
                  snprintf(line, sizeof(line), "%s/%s", type->super, type->type);
 
                if (!write_file(con, HTTP_OK, filename, line, &filestats))
-                 return (cupsdCloseClient(con));
+               {
+                 cupsdCloseClient(con);
+                 return;
+               }
              }
            }
             break;
 
-       case HTTP_POST_RECV :
+       case HTTP_STATE_POST_RECV :
            /*
            * See if the POST request includes a Content-Length field, and if
            * so check the length against any limits that are set...
            */
 
-            cupsdLogMessage(CUPSD_LOG_DEBUG2, "POST %s", con->uri);
-           cupsdLogMessage(CUPSD_LOG_DEBUG2, "CONTENT_TYPE = %s",
-                           con->http.fields[HTTP_FIELD_CONTENT_TYPE]);
-
             if (con->http.fields[HTTP_FIELD_CONTENT_LENGTH][0] &&
                MaxRequestSize > 0 &&
                con->http.data_remaining > MaxRequestSize)
@@ -1311,19 +1612,27 @@ cupsdReadClient(cupsd_client_t *con)    /* I - Client to read from */
              * Request too large...
              */
 
-              if (!cupsdSendError(con, HTTP_REQUEST_TOO_LARGE))
-               return (cupsdCloseClient(con));
+              if (!cupsdSendError(con, HTTP_REQUEST_TOO_LARGE, CUPSD_AUTH_NONE))
+             {
+               cupsdCloseClient(con);
+               return;
+             }
 
              break;
             }
-           else if (con->http.data_remaining < 0)
+           else if (con->http.data_remaining < 0 ||
+                    (!con->http.fields[HTTP_FIELD_CONTENT_LENGTH][0] &&
+                     con->http.data_encoding == HTTP_ENCODING_LENGTH))
            {
             /*
              * Negative content lengths are invalid!
              */
 
-              if (!cupsdSendError(con, HTTP_BAD_REQUEST))
-               return (cupsdCloseClient(con));
+              if (!cupsdSendError(con, HTTP_BAD_REQUEST, CUPSD_AUTH_NONE))
+             {
+               cupsdCloseClient(con);
+               return;
+             }
 
              break;
            }
@@ -1336,6 +1645,20 @@ cupsdReadClient(cupsd_client_t *con)     /* I - Client to read from */
            if (!strcmp(con->http.fields[HTTP_FIELD_CONTENT_TYPE],
                        "application/ipp"))
               con->request = ippNew();
+            else if (!WebInterface)
+           {
+            /*
+             * Web interface is disabled. Show an appropriate message...
+             */
+
+             if (!cupsdSendError(con, HTTP_WEBIF_DISABLED, CUPSD_AUTH_NONE))
+             {
+               cupsdCloseClient(con);
+               return;
+             }
+
+             break;
+           }
            else if ((!strncmp(con->uri, "/admin", 6) &&
                      strncmp(con->uri, "/admin/conf/", 12) &&
                      strncmp(con->uri, "/admin/log/", 11)) ||
@@ -1396,12 +1719,6 @@ cupsdReadClient(cupsd_client_t *con)     /* I - Client to read from */
                  cupsdSetString(&con->options, NULL);
              }
 
-              cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                             "cupsdReadClient: %d command=\"%s\", "
-                             "options = \"%s\"",
-                             con->http.fd, con->command,
-                             con->options ? con->options : "(null)");
-
              if (con->http.version <= HTTP_1_0)
                con->http.keep_alive = HTTP_KEEPALIVE_OFF;
            }
@@ -1414,8 +1731,11 @@ cupsdReadClient(cupsd_client_t *con)     /* I - Client to read from */
               if ((filename = get_file(con, &filestats, buf,
                                       sizeof(buf))) == NULL)
              {
-               if (!cupsdSendError(con, HTTP_NOT_FOUND))
-                 return (cupsdCloseClient(con));
+               if (!cupsdSendError(con, HTTP_NOT_FOUND, CUPSD_AUTH_NONE))
+               {
+                 cupsdCloseClient(con);
+                 return;
+               }
 
                break;
              }
@@ -1428,28 +1748,35 @@ cupsdReadClient(cupsd_client_t *con)    /* I - Client to read from */
                * Only POST to CGI's...
                */
 
-               if (!cupsdSendError(con, HTTP_UNAUTHORIZED))
-                 return (cupsdCloseClient(con));
+               if (!cupsdSendError(con, HTTP_UNAUTHORIZED, CUPSD_AUTH_NONE))
+               {
+                 cupsdCloseClient(con);
+                 return;
+               }
              }
            }
            break;
 
-       case HTTP_PUT_RECV :
+       case HTTP_STATE_PUT_RECV :
           /*
            * Validate the resource name...
            */
 
-            if (strncmp(con->uri, "/admin/conf/", 12) ||
-               strchr(con->uri + 12, '/') ||
-               strlen(con->uri) == 12)
+            if (strcmp(con->uri, "/admin/conf/cupsd.conf"))
            {
             /*
-             * PUT can only be done to configuration files under
-             * /admin/conf...
+             * PUT can only be done to the cupsd.conf file...
              */
 
-             if (!cupsdSendError(con, HTTP_FORBIDDEN))
-               return (cupsdCloseClient(con));
+             cupsdLogMessage(CUPSD_LOG_ERROR,
+                             "[Client %d] Disallowed PUT request for \"%s\".",
+                             con->http.fd, con->uri);
+
+             if (!cupsdSendError(con, HTTP_FORBIDDEN, CUPSD_AUTH_NONE))
+             {
+               cupsdCloseClient(con);
+               return;
+             }
 
              break;
            }
@@ -1459,10 +1786,6 @@ cupsdReadClient(cupsd_client_t *con)     /* I - Client to read from */
            * so check the length against any limits that are set...
            */
 
-            cupsdLogMessage(CUPSD_LOG_DEBUG2, "PUT %s", con->uri);
-           cupsdLogMessage(CUPSD_LOG_DEBUG2, "CONTENT_TYPE = %s",
-                           con->http.fields[HTTP_FIELD_CONTENT_TYPE]);
-
             if (con->http.fields[HTTP_FIELD_CONTENT_LENGTH][0] &&
                MaxRequestSize > 0 &&
                con->http.data_remaining > MaxRequestSize)
@@ -1471,8 +1794,11 @@ cupsdReadClient(cupsd_client_t *con)     /* I - Client to read from */
              * Request too large...
              */
 
-              if (!cupsdSendError(con, HTTP_REQUEST_TOO_LARGE))
-               return (cupsdCloseClient(con));
+              if (!cupsdSendError(con, HTTP_REQUEST_TOO_LARGE, CUPSD_AUTH_NONE))
+             {
+               cupsdCloseClient(con);
+               return;
+             }
 
              break;
             }
@@ -1482,8 +1808,11 @@ cupsdReadClient(cupsd_client_t *con)     /* I - Client to read from */
              * Negative content lengths are invalid!
              */
 
-              if (!cupsdSendError(con, HTTP_BAD_REQUEST))
-               return (cupsdCloseClient(con));
+              if (!cupsdSendError(con, HTTP_BAD_REQUEST, CUPSD_AUTH_NONE))
+             {
+               cupsdCloseClient(con);
+               return;
+             }
 
              break;
            }
@@ -1496,14 +1825,18 @@ cupsdReadClient(cupsd_client_t *con)    /* I - Client to read from */
                            request_id ++);
            con->file = open(con->filename, O_WRONLY | O_CREAT | O_TRUNC, 0640);
 
-            cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                           "cupsdReadClient: %d REQUEST %s=%d", con->http.fd,
-                           con->filename, con->file);
-
            if (con->file < 0)
            {
-             if (!cupsdSendError(con, HTTP_REQUEST_TOO_LARGE))
-               return (cupsdCloseClient(con));
+             cupsdLogMessage(CUPSD_LOG_ERROR,
+                             "[Client %d] Unable to create request file "
+                             "\"%s\": %s", con->http.fd, con->filename,
+                             strerror(errno));
+
+             if (!cupsdSendError(con, HTTP_REQUEST_TOO_LARGE, CUPSD_AUTH_NONE))
+             {
+               cupsdCloseClient(con);
+               return;
+             }
            }
 
            fchmod(con->file, 0640);
@@ -1511,12 +1844,13 @@ cupsdReadClient(cupsd_client_t *con)    /* I - Client to read from */
            fcntl(con->file, F_SETFD, fcntl(con->file, F_GETFD) | FD_CLOEXEC);
            break;
 
-       case HTTP_DELETE :
-       case HTTP_TRACE :
-            cupsdSendError(con, HTTP_NOT_IMPLEMENTED);
-           return (cupsdCloseClient(con));
+       case HTTP_STATE_DELETE :
+       case HTTP_STATE_TRACE :
+            cupsdSendError(con, HTTP_NOT_IMPLEMENTED, CUPSD_AUTH_NONE);
+           cupsdCloseClient(con);
+           return;
 
-       case HTTP_HEAD :
+       case HTTP_STATE_HEAD :
             if (!strncmp(con->uri, "/printers/", 10) &&
                !strcmp(con->uri + strlen(con->uri) - 4, ".ppd"))
            {
@@ -1531,12 +1865,63 @@ cupsdReadClient(cupsd_client_t *con)    /* I - Client to read from */
                snprintf(con->uri, sizeof(con->uri), "/ppd/%s.ppd", p->name);
              else
              {
-               if (!cupsdSendError(con, HTTP_NOT_FOUND))
-                 return (cupsdCloseClient(con));
+               if (!cupsdSendError(con, HTTP_NOT_FOUND, CUPSD_AUTH_NONE))
+               {
+                 cupsdCloseClient(con);
+                 return;
+               }
+
+               break;
+             }
+           }
+            else if (!strncmp(con->uri, "/printers/", 10) &&
+                    !strcmp(con->uri + strlen(con->uri) - 4, ".png"))
+           {
+            /*
+             * Send PNG file - get the real printer name since printer
+             * names are not case sensitive but filenames can be...
+             */
+
+              con->uri[strlen(con->uri) - 4] = '\0';   /* Drop ".ppd" */
+
+              if ((p = cupsdFindPrinter(con->uri + 10)) != NULL)
+               snprintf(con->uri, sizeof(con->uri), "/icons/%s.png", p->name);
+             else
+             {
+               if (!cupsdSendError(con, HTTP_NOT_FOUND, CUPSD_AUTH_NONE))
+               {
+                 cupsdCloseClient(con);
+                 return;
+               }
 
                break;
              }
            }
+           else if (!WebInterface)
+           {
+              if (!cupsdSendHeader(con, HTTP_OK, line, CUPSD_AUTH_NONE))
+             {
+               cupsdCloseClient(con);
+               return;
+             }
+
+             if (httpPrintf(HTTP(con), "\r\n") < 0)
+             {
+               cupsdCloseClient(con);
+               return;
+             }
+
+             if (cupsdFlushHeader(con) < 0)
+             {
+               cupsdCloseClient(con);
+               return;
+             }
+
+             con->http.state = HTTP_STATE_WAITING;
+             DEBUG_puts("cupsdReadClient: Set state to HTTP_STATE_WAITING "
+                        "after HEAD.");
+             break;
+           }
 
            if ((!strncmp(con->uri, "/admin", 6) &&
                 strncmp(con->uri, "/admin/conf/", 12) &&
@@ -1550,13 +1935,23 @@ cupsdReadClient(cupsd_client_t *con)    /* I - Client to read from */
              * CGI output...
              */
 
-              if (!cupsdSendHeader(con, HTTP_OK, "text/html"))
-               return (cupsdCloseClient(con));
+              if (!cupsdSendHeader(con, HTTP_OK, "text/html", CUPSD_AUTH_NONE))
+             {
+               cupsdCloseClient(con);
+               return;
+             }
 
              if (httpPrintf(HTTP(con), "\r\n") < 0)
-               return (cupsdCloseClient(con));
+             {
+               cupsdCloseClient(con);
+               return;
+             }
 
-             cupsdFlushHeader(con);
+             if (cupsdFlushHeader(con) < 0)
+             {
+               cupsdCloseClient(con);
+               return;
+             }
 
               cupsdLogRequest(con, HTTP_OK);
            }
@@ -1572,23 +1967,37 @@ cupsdReadClient(cupsd_client_t *con)    /* I - Client to read from */
              * /admin/conf...
              */
 
-             if (!cupsdSendError(con, HTTP_FORBIDDEN))
-               return (cupsdCloseClient(con));
+             cupsdLogMessage(CUPSD_LOG_ERROR,
+                             "[Client %d] Request for subdirectory \"%s\".",
+                             con->http.fd, con->uri);
+
+             if (!cupsdSendError(con, HTTP_FORBIDDEN, CUPSD_AUTH_NONE))
+             {
+               cupsdCloseClient(con);
+               return;
+             }
 
              break;
            }
            else if ((filename = get_file(con, &filestats, buf,
                                          sizeof(buf))) == NULL)
            {
-             if (!cupsdSendHeader(con, HTTP_NOT_FOUND, "text/html"))
-               return (cupsdCloseClient(con));
+             if (!cupsdSendHeader(con, HTTP_NOT_FOUND, "text/html",
+                                  CUPSD_AUTH_NONE))
+             {
+               cupsdCloseClient(con);
+               return;
+             }
 
               cupsdLogRequest(con, HTTP_NOT_FOUND);
            }
            else if (!check_if_modified(con, &filestats))
             {
-              if (!cupsdSendError(con, HTTP_NOT_MODIFIED))
-               return (cupsdCloseClient(con));
+              if (!cupsdSendError(con, HTTP_NOT_MODIFIED, CUPSD_AUTH_NONE))
+             {
+               cupsdCloseClient(con);
+               return;
+             }
 
               cupsdLogRequest(con, HTTP_NOT_MODIFIED);
            }
@@ -1600,30 +2009,48 @@ cupsdReadClient(cupsd_client_t *con)    /* I - Client to read from */
 
              type = mimeFileType(MimeDatabase, filename, NULL, NULL);
              if (type == NULL)
-               strcpy(line, "text/plain");
+               strlcpy(line, "text/plain", sizeof(line));
              else
                snprintf(line, sizeof(line), "%s/%s", type->super, type->type);
 
-              if (!cupsdSendHeader(con, HTTP_OK, line))
-               return (cupsdCloseClient(con));
+              if (!cupsdSendHeader(con, HTTP_OK, line, CUPSD_AUTH_NONE))
+             {
+               cupsdCloseClient(con);
+               return;
+             }
 
              if (httpPrintf(HTTP(con), "Last-Modified: %s\r\n",
                             httpGetDateString(filestats.st_mtime)) < 0)
-               return (cupsdCloseClient(con));
+             {
+               cupsdCloseClient(con);
+               return;
+             }
 
              if (httpPrintf(HTTP(con), "Content-Length: %lu\r\n",
                             (unsigned long)filestats.st_size) < 0)
-               return (cupsdCloseClient(con));
+             {
+               cupsdCloseClient(con);
+               return;
+             }
 
               cupsdLogRequest(con, HTTP_OK);
            }
 
             if (httpPrintf(HTTP(con), "\r\n") < 0)
-             return (cupsdCloseClient(con));
+           {
+             cupsdCloseClient(con);
+             return;
+           }
 
-           cupsdFlushHeader(con);
+           if (cupsdFlushHeader(con) < 0)
+            {
+             cupsdCloseClient(con);
+             return;
+           }
 
-            con->http.state = HTTP_WAITING;
+            con->http.state = HTTP_STATE_WAITING;
+           DEBUG_puts("cupsdReadClient: Set state to HTTP_STATE_WAITING "
+                      "after HEAD.");
             break;
 
        default :
@@ -1638,46 +2065,51 @@ cupsdReadClient(cupsd_client_t *con)    /* I - Client to read from */
 
   switch (con->http.state)
   {
-    case HTTP_PUT_RECV :
-        cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                       "cupsdReadClient: %d con->data_encoding=HTTP_ENCODE_%s, "
-                       "con->data_remaining=" CUPS_LLFMT ", con->file=%d",
-                       con->http.fd,
-                       con->http.data_encoding == HTTP_ENCODE_CHUNKED ?
-                           "CHUNKED" : "LENGTH",
-                       CUPS_LLCAST con->http.data_remaining, con->file);
-
-        if ((bytes = httpRead2(HTTP(con), line, sizeof(line))) < 0)
-         return (cupsdCloseClient(con));
-       else if (bytes > 0)
+    case HTTP_STATE_PUT_RECV :
+        do
        {
-         con->bytes += bytes;
-
-          cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                         "cupsdReadClient: %d writing %d bytes to %d",
-                         con->http.fd, bytes, con->file);
+          if ((bytes = httpRead2(HTTP(con), line, sizeof(line))) < 0)
+         {
+           if (con->http.error && con->http.error != EPIPE)
+             cupsdLogMessage(CUPSD_LOG_DEBUG,
+                             "[Client %d] HTTP_STATE_PUT_RECV Closing for error "
+                             "%d (%s)", con->http.fd, con->http.error,
+                             strerror(con->http.error));
+           else
+             cupsdLogMessage(CUPSD_LOG_DEBUG,
+                             "[Client %d] HTTP_STATE_PUT_RECV Closing on EOF",
+                             con->http.fd);
 
-          if (write(con->file, line, bytes) < bytes)
+           cupsdCloseClient(con);
+           return;
+         }
+         else if (bytes > 0)
          {
-            cupsdLogMessage(CUPSD_LOG_ERROR,
-                           "cupsdReadClient: Unable to write %d bytes to %s: %s",
-                           bytes, con->filename, strerror(errno));
+           con->bytes += bytes;
 
-           cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                           "cupsdReadClient: Closing data file %d...",
-                           con->file);
+            if (write(con->file, line, bytes) < bytes)
+           {
+              cupsdLogMessage(CUPSD_LOG_ERROR,
+                             "[Client %d] Unable to write %d bytes to "
+                             "\"%s\": %s", con->http.fd, bytes, con->filename,
+                             strerror(errno));
 
-           close(con->file);
-           con->file = -1;
-           unlink(con->filename);
-           cupsdClearString(&con->filename);
+             close(con->file);
+             con->file = -1;
+             unlink(con->filename);
+             cupsdClearString(&con->filename);
 
-            if (!cupsdSendError(con, HTTP_REQUEST_TOO_LARGE))
-             return (cupsdCloseClient(con));
+              if (!cupsdSendError(con, HTTP_REQUEST_TOO_LARGE, CUPSD_AUTH_NONE))
+             {
+               cupsdCloseClient(con);
+               return;
+             }
+           }
          }
-       }
+        }
+       while (con->http.state == HTTP_STATE_PUT_RECV && data_ready(con));
 
-        if (con->http.state == HTTP_WAITING)
+        if (con->http.state == HTTP_STATE_STATUS)
        {
         /*
          * End of file, see how big it is...
@@ -1685,12 +2117,6 @@ cupsdReadClient(cupsd_client_t *con)     /* I - Client to read from */
 
          fstat(con->file, &filestats);
 
-          cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                         "cupsdReadClient: %d Closing data file %d, size="
-                         CUPS_LLFMT ".",
-                          con->http.fd, con->file,
-                         CUPS_LLCAST filestats.st_size);
-
          close(con->file);
          con->file = -1;
 
@@ -1701,141 +2127,169 @@ cupsdReadClient(cupsd_client_t *con)  /* I - Client to read from */
            * Request is too big; remove it and send an error...
            */
 
-            cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                           "cupsdReadClient: %d Removing temp file %s",
-                           con->http.fd, con->filename);
            unlink(con->filename);
            cupsdClearString(&con->filename);
 
-            if (!cupsdSendError(con, HTTP_REQUEST_TOO_LARGE))
-             return (cupsdCloseClient(con));
+            if (!cupsdSendError(con, HTTP_REQUEST_TOO_LARGE, CUPSD_AUTH_NONE))
+           {
+             cupsdCloseClient(con);
+             return;
+           }
          }
 
          /*
          * Install the configuration file...
          */
 
-          status = install_conf_file(con);
+          status = install_cupsd_conf(con);
 
          /*
          * Return the status to the client...
          */
 
-          if (!cupsdSendError(con, status))
-           return (cupsdCloseClient(con));
+          if (!cupsdSendError(con, status, CUPSD_AUTH_NONE))
+         {
+           cupsdCloseClient(con);
+           return;
+         }
        }
         break;
 
-    case HTTP_POST_RECV :
-        cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                       "cupsdReadClient: %d con->data_encoding=HTTP_ENCODE_"
-                       "%s, con->data_remaining=" CUPS_LLFMT ", con->file=%d",
-                       con->http.fd,
-                       con->http.data_encoding == HTTP_ENCODE_CHUNKED ?
-                           "CHUNKED" : "LENGTH",
-                       CUPS_LLCAST con->http.data_remaining, con->file);
-
-        if (con->request != NULL)
+    case HTTP_STATE_POST_RECV :
+        do
        {
-        /*
-         * Grab any request data from the connection...
-         */
-
-         if ((ipp_state = ippRead(&(con->http), con->request)) == IPP_ERROR)
+          if (con->request && con->file < 0)
          {
-            cupsdLogMessage(CUPSD_LOG_ERROR,
-                           "cupsdReadClient: %d IPP Read Error!",
-                           con->http.fd);
+          /*
+           * Grab any request data from the connection...
+           */
 
-           cupsdSendError(con, HTTP_BAD_REQUEST);
-           return (cupsdCloseClient(con));
-         }
-         else if (ipp_state != IPP_DATA)
-         {
-            if (con->http.state == HTTP_POST_SEND)
+           if ((ipp_state = ippRead(&(con->http), con->request)) == IPP_ERROR)
            {
-             cupsdSendError(con, HTTP_BAD_REQUEST);
-             return (cupsdCloseClient(con));
+              cupsdLogMessage(CUPSD_LOG_ERROR,
+                              "[Client %d] IPP read error: %s", con->http.fd,
+                              cupsLastErrorString());
+
+             cupsdSendError(con, HTTP_BAD_REQUEST, CUPSD_AUTH_NONE);
+             cupsdCloseClient(con);
+             return;
            }
+           else if (ipp_state != IPP_DATA)
+           {
+              if (con->http.state == HTTP_STATE_POST_SEND)
+             {
+               cupsdSendError(con, HTTP_BAD_REQUEST, CUPSD_AUTH_NONE);
+               cupsdCloseClient(con);
+               return;
+             }
 
-           break;
-          }
-         else
-           con->bytes += ippLength(con->request);
-       }
+             if (data_ready(con))
+               continue;
+             break;
+            }
+           else
+           {
+             cupsdLogMessage(CUPSD_LOG_DEBUG, "[Client %d] %d.%d %s %d",
+                             con->http.fd, con->request->request.op.version[0],
+                             con->request->request.op.version[1],
+                             ippOpString(con->request->request.op.operation_id),
+                             con->request->request.op.request_id);
+             con->bytes += ippLength(con->request);
+           }
+         }
 
-        if (con->file < 0 && con->http.state != HTTP_POST_SEND)
-       {
-         /*
-         * Create a file as needed for the request data...
-         */
+          if (con->file < 0 && con->http.state != HTTP_STATE_POST_SEND)
+         {
+           /*
+           * Create a file as needed for the request data...
+           */
 
-          cupsdSetStringf(&con->filename, "%s/%08x", RequestRoot, request_id ++);
-         con->file = open(con->filename, O_WRONLY | O_CREAT | O_TRUNC, 0640);
+            cupsdSetStringf(&con->filename, "%s/%08x", RequestRoot,
+                           request_id ++);
+           con->file = open(con->filename, O_WRONLY | O_CREAT | O_TRUNC, 0640);
 
-          cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdReadClient: %d REQUEST %s=%d", con->http.fd,
-                         con->filename, con->file);
+           if (con->file < 0)
+           {
+             cupsdLogMessage(CUPSD_LOG_ERROR,
+                             "[Client %d] Unable to create request file "
+                             "\"%s\": %s", con->http.fd, con->filename,
+                             strerror(errno));
 
-         if (con->file < 0)
-         {
-           if (!cupsdSendError(con, HTTP_REQUEST_TOO_LARGE))
-             return (cupsdCloseClient(con));
-         }
+             if (!cupsdSendError(con, HTTP_REQUEST_TOO_LARGE, CUPSD_AUTH_NONE))
+             {
+               cupsdCloseClient(con);
+               return;
+             }
+           }
 
-         fchmod(con->file, 0640);
-         fchown(con->file, RunUser, Group);
-          fcntl(con->file, F_SETFD, fcntl(con->file, F_GETFD) | FD_CLOEXEC);
-       }
+           fchmod(con->file, 0640);
+           fchown(con->file, RunUser, Group);
+            fcntl(con->file, F_SETFD, fcntl(con->file, F_GETFD) | FD_CLOEXEC);
+         }
 
-       if (con->http.state != HTTP_POST_SEND)
-       {
-          if ((bytes = httpRead2(HTTP(con), line, sizeof(line))) < 0)
-           return (cupsdCloseClient(con));
-         else if (bytes > 0)
+         if (con->http.state != HTTP_STATE_POST_SEND)
          {
-           con->bytes += bytes;
-
-            cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                           "cupsdReadClient: %d writing %d bytes to %d",
-                           con->http.fd, bytes, con->file);
-
-            if (write(con->file, line, bytes) < bytes)
+           if (!httpWait(HTTP(con), 0))
+             return;
+            else if ((bytes = httpRead2(HTTP(con), line, sizeof(line))) < 0)
            {
-              cupsdLogMessage(CUPSD_LOG_ERROR,
-                             "cupsdReadClient: Unable to write %d bytes to %s: %s",
-                             bytes, con->filename, strerror(errno));
-
-             cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                             "cupsdReadClient: Closing file %d...",
-                             con->file);
+             if (con->http.error && con->http.error != EPIPE)
+               cupsdLogMessage(CUPSD_LOG_DEBUG,
+                               "[Client %d] HTTP_STATE_POST_SEND Closing for "
+                               "error %d (%s)", con->http.fd, con->http.error,
+                               strerror(con->http.error));
+             else
+               cupsdLogMessage(CUPSD_LOG_DEBUG,
+                               "[Client %d] HTTP_STATE_POST_SEND Closing on EOF",
+                               con->http.fd);
 
-             close(con->file);
-             con->file = -1;
-             unlink(con->filename);
-             cupsdClearString(&con->filename);
+             cupsdCloseClient(con);
+             return;
+           }
+           else if (bytes > 0)
+           {
+             con->bytes += bytes;
 
-              if (!cupsdSendError(con, HTTP_REQUEST_TOO_LARGE))
-               return (cupsdCloseClient(con));
+              if (write(con->file, line, bytes) < bytes)
+             {
+               cupsdLogMessage(CUPSD_LOG_ERROR,
+                               "[Client %d] Unable to write %d bytes to "
+                               "\"%s\": %s", con->http.fd, bytes,
+                               con->filename, strerror(errno));
+
+               close(con->file);
+               con->file = -1;
+               unlink(con->filename);
+               cupsdClearString(&con->filename);
+
+               if (!cupsdSendError(con, HTTP_REQUEST_TOO_LARGE,
+                                   CUPSD_AUTH_NONE))
+               {
+                 cupsdCloseClient(con);
+                 return;
+               }
+             }
+           }
+           else if (con->http.state == HTTP_STATE_POST_RECV)
+              return;
+           else if (con->http.state != HTTP_STATE_POST_SEND)
+           {
+             cupsdLogMessage(CUPSD_LOG_DEBUG,
+                             "[Client %d] Closing on unexpected state %s.",
+                             con->http.fd, http_states[con->http.state + 1]);
+             cupsdCloseClient(con);
+             return;
            }
          }
-         else if (con->http.state == HTTP_POST_RECV)
-            return (1); /* ??? */
-         else if (con->http.state != HTTP_POST_SEND)
-           return (cupsdCloseClient(con));
-       }
+        }
+       while (con->http.state == HTTP_STATE_POST_RECV && data_ready(con));
 
-       if (con->http.state == HTTP_POST_SEND)
+       if (con->http.state == HTTP_STATE_POST_SEND)
        {
          if (con->file >= 0)
          {
            fstat(con->file, &filestats);
 
-            cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                           "cupsdReadClient: %d Closing data file %d, "
-                           "size=" CUPS_LLFMT ".",
-                            con->http.fd, con->file,
-                           CUPS_LLCAST filestats.st_size);
-
            close(con->file);
            con->file = -1;
 
@@ -1846,9 +2300,6 @@ cupsdReadClient(cupsd_client_t *con)      /* I - Client to read from */
              * Request is too big; remove it and send an error...
              */
 
-              cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                             "cupsdReadClient: %d Removing temp file %s",
-                             con->http.fd, con->filename);
              unlink(con->filename);
              cupsdClearString(&con->filename);
 
@@ -1862,16 +2313,31 @@ cupsdReadClient(cupsd_client_t *con)    /* I - Client to read from */
                con->request = NULL;
               }
 
-              if (!cupsdSendError(con, HTTP_REQUEST_TOO_LARGE))
-               return (cupsdCloseClient(con));
+              if (!cupsdSendError(con, HTTP_REQUEST_TOO_LARGE, CUPSD_AUTH_NONE))
+             {
+               cupsdCloseClient(con);
+               return;
+             }
+           }
+           else if (filestats.st_size == 0)
+           {
+            /*
+             * Don't allow empty file...
+             */
+
+             unlink(con->filename);
+             cupsdClearString(&con->filename);
            }
 
            if (con->command)
            {
              if (!cupsdSendCommand(con, con->command, con->options, 0))
              {
-               if (!cupsdSendError(con, HTTP_NOT_FOUND))
-                 return (cupsdCloseClient(con));
+               if (!cupsdSendError(con, HTTP_NOT_FOUND, CUPSD_AUTH_NONE))
+               {
+                 cupsdCloseClient(con);
+                 return;
+               }
               }
              else
                cupsdLogRequest(con, HTTP_OK);
@@ -1879,7 +2345,17 @@ cupsdReadClient(cupsd_client_t *con)     /* I - Client to read from */
          }
 
           if (con->request)
-           return (cupsdProcessIPPRequest(con));
+         {
+           cupsdProcessIPPRequest(con);
+
+           if (con->filename)
+           {
+             unlink(con->filename);
+             cupsdClearString(&con->filename);
+           }
+
+           return;
+         }
        }
         break;
 
@@ -1887,10 +2363,21 @@ cupsdReadClient(cupsd_client_t *con)    /* I - Client to read from */
         break; /* Anti-compiler-warning-code */
   }
 
-  if (!con->http.keep_alive && con->http.state == HTTP_WAITING)
-    return (cupsdCloseClient(con));
-  else
-    return (1);
+  if (con->http.state == HTTP_STATE_WAITING)
+  {
+    if (!con->http.keep_alive)
+    {
+      cupsdLogMessage(CUPSD_LOG_DEBUG,
+                     "[Client %d] Closing because Keep-Alive disabled",
+                     con->http.fd);
+      cupsdCloseClient(con);
+    }
+    else
+    {
+      cupsArrayRemove(ActiveClients, con);
+      cupsdSetBusyState();
+    }
+  }
 }
 
 
@@ -1915,7 +2402,7 @@ cupsdSendCommand(
     if (fd < 0)
     {
       cupsdLogMessage(CUPSD_LOG_ERROR,
-                      "cupsdSendCommand: %d Unable to open \"%s\" for reading: %s",
+                      "[Client %d] Unable to open \"%s\" for reading: %s",
                       con->http.fd, con->filename ? con->filename : "/dev/null",
                      strerror(errno));
       return (0);
@@ -1931,30 +2418,23 @@ cupsdSendCommand(
   if (fd >= 0)
     close(fd);
 
-  cupsdLogMessage(CUPSD_LOG_INFO, "Started \"%s\" (pid=%d)", command,
-                  con->pipe_pid);
+  cupsdLogMessage(CUPSD_LOG_INFO, "[Client %d] Started \"%s\" (pid=%d)",
+                  con->http.fd, command, con->pipe_pid);
 
-  cupsdLogMessage(CUPSD_LOG_DEBUG, "cupsdSendCommand: %d file=%d",
-                  con->http.fd, con->file);
+  cupsdLogMessage(CUPSD_LOG_DEBUG, "[Client %d] file=%d", con->http.fd,
+                  con->file);
 
   if (con->pipe_pid == 0)
     return (0);
 
   fcntl(con->file, F_SETFD, fcntl(con->file, F_GETFD) | FD_CLOEXEC);
 
-  cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                  "cupsdSendCommand: Adding fd %d to InputSet...", con->file);
-  cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                  "cupsdSendCommand: Adding fd %d to OutputSet...",
-                  con->http.fd);
-
-  FD_SET(con->file, InputSet);
-  FD_SET(con->http.fd, OutputSet);
+  cupsdAddSelect(con->file, (cupsd_selfunc_t)write_pipe, NULL, con);
 
   con->sent_header = 0;
   con->file_ready  = 0;
   con->got_fields  = 0;
-  con->field_col   = 0;
+  con->header_used = 0;
 
   return (1);
 }
@@ -1966,8 +2446,13 @@ cupsdSendCommand(
 
 int                                    /* O - 1 if successful, 0 otherwise */
 cupsdSendError(cupsd_client_t *con,    /* I - Connection */
-               http_status_t  code)    /* I - Error code */
+               http_status_t  code,    /* I - Error code */
+              int            auth_type)/* I - Authentication type */
 {
+  cupsdLogMessage(CUPSD_LOG_DEBUG2,
+                  "[Client %d] cupsdSendError code=%d, auth_type=%d",
+                 con->http.fd, code, auth_type);
+
 #ifdef HAVE_SSL
  /*
   * Force client to upgrade for authentication if that is how the
@@ -1976,11 +2461,9 @@ cupsdSendError(cupsd_client_t *con,      /* I - Connection */
 
   if (code == HTTP_UNAUTHORIZED &&
       DefaultEncryption == HTTP_ENCRYPT_REQUIRED &&
-      strcasecmp(con->http.hostname, "localhost") &&
+      _cups_strcasecmp(con->http.hostname, "localhost") &&
       !con->http.tls)
   {
-    cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                    "cupsdSendError: Encryption before authentication!");
     code = HTTP_UPGRADE_REQUIRED;
   }
 #endif /* HAVE_SSL */
@@ -1991,15 +2474,15 @@ cupsdSendError(cupsd_client_t *con,     /* I - Connection */
 
   cupsdLogRequest(con, code);
 
-  cupsdLogMessage(CUPSD_LOG_DEBUG, "cupsdSendError: %d code=%d (%s)",
-                  con->http.fd, code, httpStatus(code));
-
  /*
   * To work around bugs in some proxies, don't use Keep-Alive for some
   * error messages...
+  *
+  * Kerberos authentication doesn't work without Keep-Alive, so
+  * never disable it in that case.
   */
 
-  if (code >= HTTP_BAD_REQUEST)
+  if (code >= HTTP_BAD_REQUEST && con->http.auth_type != CUPSD_AUTH_NEGOTIATE)
     con->http.keep_alive = HTTP_KEEPALIVE_OFF;
 
  /*
@@ -2007,7 +2490,7 @@ cupsdSendError(cupsd_client_t *con,       /* I - Connection */
   * 400 or 500 series, make sure the message contains some text, too!
   */
 
-  if (!cupsdSendHeader(con, code, NULL))
+  if (!cupsdSendHeader(con, code, NULL, auth_type))
     return (0);
 
 #ifdef HAVE_SSL
@@ -2015,12 +2498,12 @@ cupsdSendError(cupsd_client_t *con,     /* I - Connection */
     if (httpPrintf(HTTP(con), "Connection: Upgrade\r\n") < 0)
       return (0);
 
-  if (httpPrintf(HTTP(con), "Upgrade: TLS/1.0,HTTP/1.1\r\n") < 0)
+  if (httpPrintf(HTTP(con), "Upgrade: TLS/1.2,TLS/1.1,TLS/1.0\r\n") < 0)
     return (0);
 #endif /* HAVE_SSL */
 
-  if ((con->http.version >= HTTP_1_1 && !con->http.keep_alive) ||
-      (code >= HTTP_BAD_REQUEST && code != HTTP_UPGRADE_REQUIRED))
+  if (con->http.version >= HTTP_1_1 &&
+      con->http.keep_alive == HTTP_KEEPALIVE_OFF)
   {
     if (httpPrintf(HTTP(con), "Connection: close\r\n") < 0)
       return (0);
@@ -2044,7 +2527,8 @@ cupsdSendError(cupsd_client_t *con,       /* I - Connection */
       text = _cupsLangString(con->language,
                              _("Enter your username and password or the "
                               "root username and password to access this "
-                              "page."));
+                              "page. If you are using Kerberos authentication, "
+                              "make sure you have a valid Kerberos ticket."));
     else if (code == HTTP_UPGRADE_REQUIRED)
     {
       text = urltext;
@@ -2058,30 +2542,35 @@ cupsdSendError(cupsd_client_t *con,     /* I - Connection */
               con->servername, con->serverport, con->uri);
 
       snprintf(redirect, sizeof(redirect),
-               "<META HTTP-EQUIV=\"Refresh\" CONTENT=\"3;https://%s:%d%s\">\n",
+               "<META HTTP-EQUIV=\"Refresh\" "
+              "CONTENT=\"3;URL=https://%s:%d%s\">\n",
               con->servername, con->serverport, con->uri);
     }
+    else if (code == HTTP_WEBIF_DISABLED)
+      text = _cupsLangString(con->language,
+                             _("The web interface is currently disabled. Run "
+                              "\"cupsctl WebInterface=yes\" to enable it."));
     else
       text = "";
 
     snprintf(message, sizeof(message),
-             "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\" "
-            "\"http://www.w3.org/TR/REC-html40/loose.dtd\">\n"
+             "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\" "
+            "\"http://www.w3.org/TR/html4/loose.dtd\">\n"
             "<HTML>\n"
             "<HEAD>\n"
              "\t<META HTTP-EQUIV=\"Content-Type\" "
             "CONTENT=\"text/html; charset=utf-8\">\n"
-            "\t<TITLE>%d %s</TITLE>\n"
+            "\t<TITLE>%s - " CUPS_SVERSION "</TITLE>\n"
             "\t<LINK REL=\"STYLESHEET\" TYPE=\"text/css\" "
             "HREF=\"/cups.css\">\n"
             "%s"
             "</HEAD>\n"
              "<BODY>\n"
-            "<H1>%d %s</H1>\n"
+            "<H1>%s</H1>\n"
             "<P>%s</P>\n"
             "</BODY>\n"
             "</HTML>\n",
-            code, httpStatus(code), redirect, code, httpStatus(code), text);
+            httpStatus(code), redirect, httpStatus(code), text);
 
     if (httpPrintf(HTTP(con), "Content-Type: text/html; charset=utf-8\r\n") < 0)
       return (0);
@@ -2096,9 +2585,12 @@ cupsdSendError(cupsd_client_t *con,      /* I - Connection */
   else if (httpPrintf(HTTP(con), "\r\n") < 0)
     return (0);
 
-  cupsdFlushHeader(con);
+  if (cupsdFlushHeader(con) < 0)
+    return (0);
+
+  con->http.state = HTTP_STATE_WAITING;
 
-  con->http.state = HTTP_WAITING;
+  DEBUG_puts("cupsdSendError: Set state to HTTP_STATE_WAITING.");
 
   return (1);
 }
@@ -2109,37 +2601,45 @@ cupsdSendError(cupsd_client_t *con,     /* I - Connection */
  */
 
 int                                    /* O - 1 on success, 0 on failure */
-cupsdSendHeader(cupsd_client_t *con,   /* I - Client to send to */
-                http_status_t  code,   /* I - HTTP status code */
-               char           *type)   /* I - MIME type of document */
+cupsdSendHeader(
+    cupsd_client_t *con,               /* I - Client to send to */
+    http_status_t  code,               /* I - HTTP status code */
+    char           *type,              /* I - MIME type of document */
+    int            auth_type)          /* I - Type of authentication */
 {
+  char         auth_str[1024];         /* Authorization string */
+
+
  /*
   * Send the HTTP status header...
   */
 
-  httpFlushWrite(HTTP(con));
-
-  con->http.data_encoding = HTTP_ENCODE_FIELDS;
-
-  if (httpPrintf(HTTP(con), "HTTP/%d.%d %d %s\r\n", con->http.version / 100,
-                 con->http.version % 100, code, httpStatus(code)) < 0)
-    return (0);
-
   if (code == HTTP_CONTINUE)
   {
    /*
     * 100-continue doesn't send any headers...
     */
 
-    if (httpPrintf(HTTP(con), "\r\n") < 0)
-      return (0);
-    else
-    {
-      cupsdFlushHeader(con);
-      return (1);
-    }
+    return (httpPrintf(HTTP(con), "HTTP/%d.%d 100 Continue\r\n\r\n",
+                      con->http.version / 100, con->http.version % 100) > 0);
+  }
+  else if (code == HTTP_WEBIF_DISABLED)
+  {
+   /*
+    * Treat our special "web interface is disabled" status as "200 OK" for web
+    * browsers.
+    */
+
+    code = HTTP_OK;
   }
 
+  httpFlushWrite(HTTP(con));
+
+  con->http.data_encoding = HTTP_ENCODING_FIELDS;
+
+  if (httpPrintf(HTTP(con), "HTTP/%d.%d %d %s\r\n", con->http.version / 100,
+                 con->http.version % 100, code, httpStatus(code)) < 0)
+    return (0);
   if (httpPrintf(HTTP(con), "Date: %s\r\n", httpGetDateString(time(NULL))) < 0)
     return (0);
   if (ServerHeader)
@@ -2154,31 +2654,94 @@ cupsdSendHeader(cupsd_client_t *con,    /* I - Client to send to */
       return (0);
   }
   if (code == HTTP_METHOD_NOT_ALLOWED)
-    if (httpPrintf(HTTP(con), "Allow: GET, HEAD, OPTIONS, POST\r\n") < 0)
+    if (httpPrintf(HTTP(con), "Allow: GET, HEAD, OPTIONS, POST, PUT\r\n") < 0)
       return (0);
 
   if (code == HTTP_UNAUTHORIZED)
   {
-    int        auth_type;                      /* Authentication type */
+    if (auth_type == CUPSD_AUTH_NONE)
+    {
+      if (!con->best || con->best->type <= CUPSD_AUTH_NONE)
+       auth_type = cupsdDefaultAuthType();
+      else
+       auth_type = con->best->type;
+    }
 
+    auth_str[0] = '\0';
 
-    if (!con->best || con->best->type == AUTH_NONE)
-      auth_type = DefaultAuthType;
-    else
-      auth_type = con->best->type;
-      
-    if (auth_type != AUTH_DIGEST)
+    if (auth_type == CUPSD_AUTH_BASIC || auth_type == CUPSD_AUTH_BASICDIGEST)
+      strlcpy(auth_str, "Basic realm=\"CUPS\"", sizeof(auth_str));
+    else if (auth_type == CUPSD_AUTH_DIGEST)
+      snprintf(auth_str, sizeof(auth_str), "Digest realm=\"CUPS\", nonce=\"%s\"",
+              con->http.hostname);
+#ifdef HAVE_GSSAPI
+    else if (auth_type == CUPSD_AUTH_NEGOTIATE)
     {
-      if (httpPrintf(HTTP(con),
-                     "WWW-Authenticate: Basic realm=\"CUPS\"\r\n") < 0)
-       return (0);
+#  ifdef AF_LOCAL
+      if (_httpAddrFamily(con->http.hostaddr) == AF_LOCAL)
+        strlcpy(auth_str, "Basic realm=\"CUPS\"", sizeof(auth_str));
+      else
+#  endif /* AF_LOCAL */
+      strlcpy(auth_str, "Negotiate", sizeof(auth_str));
     }
-    else
+#endif /* HAVE_GSSAPI */
+
+    if (con->best && auth_type != CUPSD_AUTH_NEGOTIATE &&
+        !_cups_strcasecmp(con->http.hostname, "localhost"))
     {
-      if (httpPrintf(HTTP(con),
-                     "WWW-Authenticate: Digest realm=\"CUPS\", nonce=\"%s\"\r\n",
-                    con->http.hostname) < 0)
-       return (0);
+     /*
+      * Add a "trc" (try root certification) parameter for local non-Kerberos
+      * requests when the request requires system group membership - then the
+      * client knows the root certificate can/should be used.
+      *
+      * Also, for OS X we also look for @AUTHKEY and add an "authkey"
+      * parameter as needed...
+      */
+
+      char     *name,                  /* Current user name */
+               *auth_key;              /* Auth key buffer */
+      size_t   auth_size;              /* Size of remaining buffer */
+
+      auth_key  = auth_str + strlen(auth_str);
+      auth_size = sizeof(auth_str) - (auth_key - auth_str);
+
+      for (name = (char *)cupsArrayFirst(con->best->names);
+           name;
+          name = (char *)cupsArrayNext(con->best->names))
+      {
+#ifdef HAVE_AUTHORIZATION_H
+       if (!_cups_strncasecmp(name, "@AUTHKEY(", 9))
+       {
+         snprintf(auth_key, auth_size, ", authkey=\"%s\"", name + 9);
+         /* end parenthesis is stripped in conf.c */
+         break;
+        }
+       else
+#endif /* HAVE_AUTHORIZATION_H */
+       if (!_cups_strcasecmp(name, "@SYSTEM"))
+       {
+#ifdef HAVE_AUTHORIZATION_H
+         if (SystemGroupAuthKey)
+           snprintf(auth_key, auth_size,
+                    ", authkey=\"%s\"",
+                    SystemGroupAuthKey);
+          else
+#else
+         strlcpy(auth_key, ", trc=\"y\"", auth_size);
+#endif /* HAVE_AUTHORIZATION_H */
+         break;
+       }
+      }
+    }
+
+    if (auth_str[0])
+    {
+      cupsdLogMessage(CUPSD_LOG_DEBUG,
+                      "[Client %d] WWW-Authenticate: %s", con->http.fd,
+                      auth_str);
+
+      if (httpPrintf(HTTP(con), "WWW-Authenticate: %s\r\n", auth_str) < 0)
+        return (0);
     }
   }
 
@@ -2219,8 +2782,13 @@ cupsdUpdateCGI(void)
 
   while ((ptr = cupsdStatBufUpdate(CGIStatusBuffer, &loglevel,
                                    message, sizeof(message))) != NULL)
+  {
+    if (loglevel == CUPSD_LOG_INFO)
+      cupsdLogMessage(CUPSD_LOG_INFO, "%s", message);
+
     if (!strchr(CGIStatusBuffer->buffer, '\n'))
       break;
+  }
 
   if (ptr == NULL && !CGIStatusBuffer->bufused)
   {
@@ -2239,37 +2807,109 @@ cupsdUpdateCGI(void)
  * 'cupsdWriteClient()' - Write data to a client as needed.
  */
 
-int                                    /* O - 1 if success, 0 if fail */
+void
 cupsdWriteClient(cupsd_client_t *con)  /* I - Client connection */
 {
-  int          bytes;                  /* Number of bytes written */
-  char         buf[16385];             /* Data buffer */
-  char         *bufptr;                /* Pointer into buffer */
+  int          bytes,                  /* Number of bytes written */
+               field_col;              /* Current column */
+  char         *bufptr,                /* Pointer into buffer */
+               *bufend;                /* Pointer to end of buffer */
   ipp_state_t  ipp_state;              /* IPP state value */
 
 
-#ifdef DEBUG
-  cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                  "cupsdWriteClient(con=%p) %d response=%p, file=%d "
-                 "pipe_pid=%d state=%d",
-                  con, con->http.fd, con->response, con->file, con->pipe_pid,
-                 con->http.state);
-#endif /* DEBUG */
-
-  if (con->http.state != HTTP_GET_SEND &&
-      con->http.state != HTTP_POST_SEND)
-    return (1);
+  cupsdLogMessage(CUPSD_LOG_DEBUG,
+                 "[Client %d] cupsdWriteClient "
+                 "error=%d, "
+                 "used=%d, "
+                 "state=%s, "
+                 "data_encoding=HTTP_ENCODING_%s, "
+                 "data_remaining=" CUPS_LLFMT ", "
+                 "response=%p(%s), "
+                 "pipe_pid=%d, "
+                 "file=%d",
+                 con->http.fd, con->http.error, con->http.used,
+                 http_states[con->http.state + 1],
+                 con->http.data_encoding == HTTP_ENCODING_CHUNKED ?
+                     "CHUNKED" : "LENGTH",
+                 CUPS_LLCAST con->http.data_remaining,
+                 con->response,
+                 con->response ? ipp_states[con->response->state] : "",
+                 con->pipe_pid, con->file);
+
+  if (con->http.state != HTTP_STATE_GET_SEND &&
+      con->http.state != HTTP_STATE_POST_SEND)
+  {
+   /*
+    * If we get called in the wrong state, then something went wrong with the
+    * connection and we need to shut it down...
+    */
+
+    cupsdLogMessage(CUPSD_LOG_DEBUG,
+                   "[Client %d] Closing on unexpected HTTP state %s.",
+                   con->http.fd, http_states[con->http.state + 1]);
+    cupsdCloseClient(con);
+    return;
+  }
 
-  if (con->response != NULL)
+  if (con->pipe_pid)
   {
-    ipp_state = ippWrite(&(con->http), con->response);
-    bytes     = ipp_state != IPP_ERROR && ipp_state != IPP_DATA;
+   /*
+    * Make sure we select on the CGI output...
+    */
+
+    cupsdAddSelect(con->file, (cupsd_selfunc_t)write_pipe, NULL, con);
+
+    if (!con->file_ready)
+    {
+     /*
+      * Try again later when there is CGI output available...
+      */
+
+      cupsdRemoveSelect(con->http.fd);
+      return;
+    }
+
+    con->file_ready = 0;
   }
-  else if ((bytes = read(con->file, buf, sizeof(buf) - 1)) > 0)
+
+  if (con->response && con->response->state != IPP_DATA)
   {
-    cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                    "cupsdWriteClient: Read %d bytes from file %d...",
-                    bytes, con->file);
+    int wused = con->http.wused;       /* Previous write buffer use */
+
+    do
+    {
+     /*
+      * Write a single attribute or the IPP message header...
+      */
+
+//      ipp_state = ippWrite(HTTP(con), con->response);
+      ipp_state = ippWriteIO(HTTP(con), (ipp_iocb_t)httpWrite2, 1, NULL,
+                             con->response);
+
+     /*
+      * If the write buffer has been flushed, stop buffering up attributes...
+      */
+
+      if (con->http.wused <= wused)
+        break;
+    }
+    while (ipp_state != IPP_STATE_DATA && ipp_state != IPP_STATE_ERROR);
+
+    cupsdLogMessage(CUPSD_LOG_DEBUG,
+                    "[Client %d] Writing IPP response, ipp_state=%d, old "
+                    "wused=%d, new wused=%d", con->http.fd, ipp_state, wused,
+                    con->http.wused);
+
+    if (con->http.wused > 0)
+      httpFlushWrite(HTTP(con));
+
+    bytes = ipp_state != IPP_STATE_ERROR &&
+           (con->file >= 0 || ipp_state != IPP_STATE_DATA);
+  }
+  else if ((bytes = read(con->file, con->header + con->header_used,
+                        sizeof(con->header) - con->header_used)) > 0)
+  {
+    con->header_used += bytes;
 
     if (con->pipe_pid && !con->got_fields)
     {
@@ -2277,20 +2917,22 @@ cupsdWriteClient(cupsd_client_t *con)   /* I - Client connection */
       * Inspect the data for Content-Type and other fields.
       */
 
-      buf[bytes] = '\0';
-
-      for (bufptr = buf; !con->got_fields && *bufptr; bufptr ++)
+      for (bufptr = con->header, bufend = con->header + con->header_used,
+               field_col = 0;
+           !con->got_fields && bufptr < bufend;
+          bufptr ++)
+      {
         if (*bufptr == '\n')
        {
         /*
          * Send line to client...
          */
 
-         if (bufptr > buf && bufptr[-1] == '\r')
+         if (bufptr > con->header && bufptr[-1] == '\r')
            bufptr[-1] = '\0';
          *bufptr++ = '\0';
 
-          cupsdLogMessage(CUPSD_LOG_DEBUG2, "Script header: %s", buf);
+          cupsdLogMessage(CUPSD_LOG_DEBUG, "Script header: %s", con->header);
 
           if (!con->sent_header)
          {
@@ -2298,142 +2940,150 @@ cupsdWriteClient(cupsd_client_t *con) /* I - Client connection */
            * Handle redirection and CGI status codes...
            */
 
-            if (!strncasecmp(buf, "Location:", 9))
+            if (!_cups_strncasecmp(con->header, "Location:", 9))
            {
-             cupsdSendHeader(con, HTTP_SEE_OTHER, NULL);
+             if (!cupsdSendHeader(con, HTTP_SEE_OTHER, NULL, CUPSD_AUTH_NONE))
+             {
+               cupsdCloseClient(con);
+               return;
+             }
+
+             con->sent_header = 2;
+
              if (httpPrintf(HTTP(con), "Content-Length: 0\r\n") < 0)
-               return (0);
+               return;
+           }
+           else if (!_cups_strncasecmp(con->header, "Status:", 7))
+           {
+             cupsdSendError(con, (http_status_t)atoi(con->header + 7),
+                            CUPSD_AUTH_NONE);
+             con->sent_header = 2;
            }
-           else if (!strncasecmp(buf, "Status:", 7))
-             cupsdSendError(con, (http_status_t)atoi(buf + 7));
            else
            {
-             cupsdSendHeader(con, HTTP_OK, NULL);
+             if (!cupsdSendHeader(con, HTTP_OK, NULL, CUPSD_AUTH_NONE))
+             {
+               cupsdCloseClient(con);
+               return;
+             }
+
+             con->sent_header = 1;
 
              if (con->http.version == HTTP_1_1)
              {
                if (httpPrintf(HTTP(con), "Transfer-Encoding: chunked\r\n") < 0)
-                 return (0);
+                 return;
              }
             }
-
-           con->sent_header = 1;
          }
 
-         if (strncasecmp(buf, "Status:", 7))
-           httpPrintf(HTTP(con), "%s\r\n", buf);
-
-         cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdWriteClient: %d %s",
-                         con->http.fd, buf);
+         if (_cups_strncasecmp(con->header, "Status:", 7))
+           httpPrintf(HTTP(con), "%s\r\n", con->header);
 
          /*
          * Update buffer...
          */
 
-         bytes -= (bufptr - buf);
-         memmove(buf, bufptr, bytes + 1);
-         bufptr = buf - 1;
+         con->header_used -= bufptr - con->header;
+
+         if (con->header_used > 0)
+           memmove(con->header, bufptr, con->header_used);
+
+         bufptr = con->header - 1;
 
          /*
          * See if the line was empty...
          */
 
-         if (con->field_col == 0)
+         if (field_col == 0)
          {
            con->got_fields = 1;
 
-            cupsdFlushHeader(con);
+            if (cupsdFlushHeader(con) < 0)
+           {
+             cupsdCloseClient(con);
+             return;
+           }
 
            if (con->http.version == HTTP_1_1)
-             con->http.data_encoding = HTTP_ENCODE_CHUNKED;
+             con->http.data_encoding = HTTP_ENCODING_CHUNKED;
           }
          else
-           con->field_col = 0;
+           field_col = 0;
        }
        else if (*bufptr != '\r')
-         con->field_col ++;
-
-      cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                      "cupsdWriteClient: %d bytes=%d, got_fields=%d",
-                      con->http.fd, bytes, con->got_fields);
+         field_col ++;
+      }
 
-      if (bytes > 0 && !con->got_fields)
+      if (!con->got_fields)
       {
-       /*
-        * Remaining text needs to go out...
-       */
-
-        httpPrintf(HTTP(con), "%s", buf);
-
         con->http.activity = time(NULL);
-        return (1);
+        return;
       }
-      else if (bytes == 0)
-        con->http.activity = time(NULL);
     }
 
-    if (bytes > 0)
+    if (con->header_used > 0)
     {
-      if (httpWrite2(HTTP(con), buf, bytes) < 0)
+      if (httpWrite2(HTTP(con), con->header, con->header_used) < 0)
       {
-       cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                       "cupsdWriteClient: %d Write of %d bytes failed!",
-                       con->http.fd, bytes);
-
+       cupsdLogMessage(CUPSD_LOG_DEBUG,
+                       "[Client %d] Closing for error %d (%s)",
+                       con->http.fd, con->http.error,
+                       strerror(con->http.error));
        cupsdCloseClient(con);
-       return (0);
+       return;
       }
 
-      con->bytes += bytes;
+      if (con->http.data_encoding == HTTP_ENCODING_CHUNKED)
+        httpFlushWrite(HTTP(con));
 
-      if (con->http.state == HTTP_WAITING)
+      con->bytes += con->header_used;
+
+      if (con->http.state == HTTP_STATE_WAITING)
        bytes = 0;
+      else
+        bytes = con->header_used;
+
+      con->header_used = 0;
     }
   }
 
-  if (bytes <= 0)
+  if (bytes <= 0 ||
+      (con->http.state != HTTP_STATE_GET_SEND && con->http.state != HTTP_STATE_POST_SEND))
   {
-    cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdWriteClient: %d bytes < 0",
-                    con->http.fd);
-
-    cupsdLogRequest(con, HTTP_OK);
+    if (!con->sent_header && con->pipe_pid)
+      cupsdSendError(con, HTTP_SERVER_ERROR, CUPSD_AUTH_NONE);
+    else
+    {
+      cupsdLogRequest(con, HTTP_OK);
 
-    httpFlushWrite(HTTP(con));
+      httpFlushWrite(HTTP(con));
 
-    if (con->http.data_encoding == HTTP_ENCODE_CHUNKED)
-    {
-      if (httpPrintf(HTTP(con), "0\r\n\r\n") < 0)
+      if (con->http.data_encoding == HTTP_ENCODING_CHUNKED && con->sent_header == 1)
       {
-        cupsdCloseClient(con);
-       return (0);
+       if (httpWrite2(HTTP(con), "", 0) < 0)
+       {
+         cupsdLogMessage(CUPSD_LOG_DEBUG,
+                         "[Client %d] Closing for error %d (%s)",
+                         con->http.fd, con->http.error,
+                         strerror(con->http.error));
+         cupsdCloseClient(con);
+         return;
+       }
       }
     }
 
-    con->http.state = HTTP_WAITING;
+    con->http.state = HTTP_STATE_WAITING;
 
-    cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                    "cupsdWriteClient: Removing fd %d from OutputSet...",
-                    con->http.fd);
-
-    FD_CLR(con->http.fd, OutputSet);
+    cupsdAddSelect(con->http.fd, (cupsd_selfunc_t)cupsdReadClient, NULL, con);
 
     if (con->file >= 0)
     {
-      if (FD_ISSET(con->file, InputSet))
-      {
-       cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                       "cupsdWriteClient: Removing fd %d from InputSet...",
-                        con->file);
-       FD_CLR(con->file, InputSet);
-      }
+      cupsdRemoveSelect(con->file);
 
       if (con->pipe_pid)
        cupsdEndProcess(con->pipe_pid, 0);
 
-      cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                      "cupsdWriteClient: %d Closing data file %d.",
-                      con->http.fd, con->file);
-
       close(con->file);
       con->file     = -1;
       con->pipe_pid = 0;
@@ -2441,20 +3091,17 @@ cupsdWriteClient(cupsd_client_t *con)   /* I - Client connection */
 
     if (con->filename)
     {
-      cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                      "cupsdWriteClient: %d Removing temp file %s",
-                      con->http.fd, con->filename);
       unlink(con->filename);
       cupsdClearString(&con->filename);
     }
 
-    if (con->request != NULL)
+    if (con->request)
     {
       ippDelete(con->request);
       con->request = NULL;
     }
 
-    if (con->response != NULL)
+    if (con->response)
     {
       ippDelete(con->response);
       con->response = NULL;
@@ -2462,29 +3109,24 @@ cupsdWriteClient(cupsd_client_t *con)   /* I - Client connection */
 
     cupsdClearString(&con->command);
     cupsdClearString(&con->options);
+    cupsdClearString(&con->query_string);
 
     if (!con->http.keep_alive)
     {
+      cupsdLogMessage(CUPSD_LOG_DEBUG,
+                     "[Client %d] Closing because Keep-Alive disabled.",
+                     con->http.fd);
       cupsdCloseClient(con);
-      return (0);
+      return;
     }
-  }
-  else
-  {
-    con->file_ready = 0;
-
-    if (con->pipe_pid && !FD_ISSET(con->file, InputSet))
+    else
     {
-      cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                      "cupsdWriteClient: Adding fd %d to InputSet...",
-                     con->file);
-      FD_SET(con->file, InputSet);
+      cupsArrayRemove(ActiveClients, con);
+      cupsdSetBusyState();
     }
   }
 
   con->http.activity = time(NULL);
-
-  return (1);
 }
 
 
@@ -2510,15 +3152,17 @@ check_if_modified(
     return (1);
 
   cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                  "check_if_modified: %d If-Modified-Since=\"%s\"",
-                  con->http.fd, ptr);
+                  "[Client %d] check_if_modified "
+                 "filestats=%p(" CUPS_LLFMT ", %d)) If-Modified-Since=\"%s\"",
+                  con->http.fd, filestats, CUPS_LLCAST filestats->st_size,
+                 (int)filestats->st_mtime, ptr);
 
   while (*ptr != '\0')
   {
     while (isspace(*ptr) || *ptr == ';')
       ptr ++;
 
-    if (strncasecmp(ptr, "length=", 7) == 0)
+    if (_cups_strncasecmp(ptr, "length=", 7) == 0)
     {
       ptr += 7;
       size = strtoll(ptr, NULL, 10);
@@ -2536,496 +3180,249 @@ check_if_modified(
       ptr ++;
   }
 
-  cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                  "check_if_modified: %d sizes=" CUPS_LLFMT ","
-                 CUPS_LLFMT " dates=%d,%d",
-                  con->http.fd, CUPS_LLCAST size,
-                 CUPS_LLCAST filestats->st_size, (int)date,
-                 (int)filestats->st_mtime);
-
   return ((size != filestats->st_size && size != 0) ||
           (date < filestats->st_mtime && date != 0) ||
          (size == 0 && date == 0));
 }
 
 
-#ifdef HAVE_SSL
 /*
- * 'encrypt_client()' - Enable encryption for the client...
+ * 'compare_clients()' - Compare two client connections.
  */
 
-static int                             /* O - 1 on success, 0 on error */
-encrypt_client(cupsd_client_t *con)    /* I - Client to encrypt */
+static int                             /* O - Result of comparison */
+compare_clients(cupsd_client_t *a,     /* I - First client */
+                cupsd_client_t *b,     /* I - Second client */
+                void           *data)  /* I - User data (not used) */
 {
-#  ifdef HAVE_LIBSSL
-  SSL_CTX      *context;               /* Context for encryption */
-  SSL          *conn;                  /* Connection for encryption */
-  unsigned long        error;                  /* Error code */
+  (void)data;
+
+  if (a == b)
+    return (0);
+  else if (a < b)
+    return (-1);
+  else
+    return (1);
+}
 
 
- /*
 * Verify that we have a certificate...
 */
+/*
* 'data_ready()' - Check whether data is available from a client.
+ */
 
-  if (access(ServerKey, 0) || access(ServerCertificate, 0))
+static int                             /* O - 1 if data is ready, 0 otherwise */
+data_ready(cupsd_client_t *con)                /* I - Client */
+{
+  if (con->http.used > 0)
+    return (1);
+#ifdef HAVE_SSL
+  else if (con->http.tls)
   {
-   /*
-    * Nope, make a self-signed certificate...
-    */
+#  ifdef HAVE_LIBSSL
+    if (SSL_pending((SSL *)(con->http.tls)))
+      return (1);
+#  elif defined(HAVE_GNUTLS)
+    if (gnutls_record_check_pending(con->http.tls))
+      return (1);
+#  elif defined(HAVE_CDSASSL)
+    size_t bytes;                      /* Bytes that are available */
 
-    if (!make_certificate())
-      return (0);
+    if (!SSLGetBufferedReadSize(con->http.tls, &bytes) && bytes > 0)
+      return (1);
+#  endif /* HAVE_LIBSSL */
   }
+#endif /* HAVE_SSL */
 
- /*
-  * Create the SSL context and accept the connection...
-  */
-
-  context = SSL_CTX_new(SSLv23_server_method());
+  return (0);
+}
 
-  SSL_CTX_set_options(context, SSL_OP_NO_SSLv2); /* Only use SSLv3 or TLS */
-  SSL_CTX_use_PrivateKey_file(context, ServerKey, SSL_FILETYPE_PEM);
-  SSL_CTX_use_certificate_file(context, ServerCertificate, SSL_FILETYPE_PEM);
 
-  conn = SSL_new(context);
+/*
+ * 'get_file()' - Get a filename and state info.
+ */
 
-  SSL_set_fd(conn, con->http.fd);
-  if (SSL_accept(conn) != 1)
-  {
-    cupsdLogMessage(CUPSD_LOG_ERROR,
-                    "encrypt_client: Unable to encrypt connection from %s!",
-                    con->http.hostname);
+static char *                          /* O  - Real filename */
+get_file(cupsd_client_t *con,          /* I  - Client connection */
+         struct stat    *filestats,    /* O  - File information */
+         char           *filename,     /* IO - Filename buffer */
+         int            len)           /* I  - Buffer length */
+{
+  int          status;                 /* Status of filesystem calls */
+  char         *ptr;                   /* Pointer info filename */
+  int          plen;                   /* Remaining length after pointer */
+  char         language[7];            /* Language subdirectory, if any */
 
-    while ((error = ERR_get_error()) != 0)
-      cupsdLogMessage(CUPSD_LOG_ERROR, "encrypt_client: %s",
-                      ERR_error_string(error, NULL));
 
-    SSL_CTX_free(context);
-    SSL_free(conn);
-    return (0);
-  }
+ /*
+  * Figure out the real filename...
+  */
 
-  cupsdLogMessage(CUPSD_LOG_DEBUG,
-                  "encrypt_client: %d Connection from %s now encrypted.",
-                  con->http.fd, con->http.hostname);
+  language[0] = '\0';
 
-  con->http.tls = conn;
-  return (1);
-  
-#  elif defined(HAVE_GNUTLS)
-  http_tls_t   *conn;                  /* TLS session object */
-  int          error;                  /* Error code */
-  gnutls_certificate_server_credentials *credentials;
-                                       /* TLS credentials */
+  if (!strncmp(con->uri, "/ppd/", 5) && !strchr(con->uri + 5, '/'))
+    snprintf(filename, len, "%s%s", ServerRoot, con->uri);
+  else if (!strncmp(con->uri, "/icons/", 7) && !strchr(con->uri + 7, '/'))
+  {
+    snprintf(filename, len, "%s/%s", CacheDir, con->uri + 7);
+    if (access(filename, F_OK) < 0)
+      snprintf(filename, len, "%s/images/generic.png", DocumentRoot);
+  }
+  else if (!strncmp(con->uri, "/rss/", 5) && !strchr(con->uri + 5, '/'))
+    snprintf(filename, len, "%s/rss/%s", CacheDir, con->uri + 5);
+  else if (!strncmp(con->uri, "/admin/conf/", 12))
+    snprintf(filename, len, "%s%s", ServerRoot, con->uri + 11);
+  else if (!strncmp(con->uri, "/admin/log/", 11))
+  {
+    if (!strncmp(con->uri + 11, "access_log", 10) && AccessLog[0] == '/')
+      strlcpy(filename, AccessLog, len);
+    else if (!strncmp(con->uri + 11, "error_log", 9) && ErrorLog[0] == '/')
+      strlcpy(filename, ErrorLog, len);
+    else if (!strncmp(con->uri + 11, "page_log", 8) && PageLog[0] == '/')
+      strlcpy(filename, PageLog, len);
+    else
+      return (NULL);
+  }
+  else if (con->language)
+  {
+    snprintf(language, sizeof(language), "/%s", con->language->language);
+    snprintf(filename, len, "%s%s%s", DocumentRoot, language, con->uri);
+  }
+  else
+    snprintf(filename, len, "%s%s", DocumentRoot, con->uri);
 
+  if ((ptr = strchr(filename, '?')) != NULL)
+    *ptr = '\0';
 
  /*
-  * Verify that we have a certificate...
+  * Grab the status for this language; if there isn't a language-specific file
+  * then fallback to the default one...
   */
 
-  if (access(ServerKey, 0) || access(ServerCertificate, 0))
+  if ((status = stat(filename, filestats)) != 0 && language[0] &&
+      strncmp(con->uri, "/icons/", 7) &&
+      strncmp(con->uri, "/ppd/", 5) &&
+      strncmp(con->uri, "/rss/", 5) &&
+      strncmp(con->uri, "/admin/conf/", 12) &&
+      strncmp(con->uri, "/admin/log/", 11))
   {
    /*
-    * Nope, make a self-signed certificate...
+    * Drop the country code...
     */
 
-    if (!make_certificate())
-      return (0);
-  }
-
- /*
-  * Create the SSL object and perform the SSL handshake...
-  */
+    language[3] = '\0';
+    snprintf(filename, len, "%s%s%s", DocumentRoot, language, con->uri);
 
-  conn = (http_tls_t *)malloc(sizeof(http_tls_t));
+    if ((ptr = strchr(filename, '?')) != NULL)
+      *ptr = '\0';
 
-  if (conn == NULL)
-    return (0);
-
-  credentials = (gnutls_certificate_server_credentials *)
-                    malloc(sizeof(gnutls_certificate_server_credentials));
-  if (credentials == NULL)
-  {
-    cupsdLogMessage(CUPSD_LOG_ERROR,
-                    "encrypt_client: Unable to encrypt connection from %s!",
-                    con->http.hostname);
-    cupsdLogMessage(CUPSD_LOG_ERROR, "encrypt_client: %s", strerror(errno));
-
-    free(conn);
-    return (0);
-  }
-
-  gnutls_certificate_allocate_credentials(credentials);
-  gnutls_certificate_set_x509_key_file(*credentials, ServerCertificate, 
-                                      ServerKey, GNUTLS_X509_FMT_PEM);
-
-  gnutls_init(&(conn->session), GNUTLS_SERVER);
-  gnutls_set_default_priority(conn->session);
-  gnutls_credentials_set(conn->session, GNUTLS_CRD_CERTIFICATE, *credentials);
-  gnutls_transport_set_ptr(conn->session,
-                           (gnutls_transport_ptr)((long)con->http.fd));
-
-  error = gnutls_handshake(conn->session);
-
-  if (error != GNUTLS_E_SUCCESS)
-  {
-    cupsdLogMessage(CUPSD_LOG_ERROR,
-                    "encrypt_client: Unable to encrypt connection from %s!",
-                    con->http.hostname);
-    cupsdLogMessage(CUPSD_LOG_ERROR, "encrypt_client: %s",
-                    gnutls_strerror(error));
-
-    gnutls_deinit(conn->session);
-    gnutls_certificate_free_credentials(*credentials);
-    free(conn);
-    free(credentials);
-    return (0);
-  }
-
-  cupsdLogMessage(CUPSD_LOG_DEBUG,
-                  "encrypt_client: %d Connection from %s now encrypted.",
-                  con->http.fd, con->http.hostname);
-
-  conn->credentials = credentials;
-  con->http.tls = conn;
-  return (1);
-
-#  elif defined(HAVE_CDSASSL)
-  OSStatus     error;                  /* Error code */
-  http_tls_t   *conn;                  /* CDSA connection information */
-  cdsa_conn_ref_t u;                   /* Connection reference union */
-
-
-  if ((conn = (http_tls_t *)malloc(sizeof(http_tls_t))) == NULL)
-    return (0);
-
-  error            = 0;
-  conn->session    = NULL;
-  conn->certsArray = get_cdsa_server_certs();
-
-  if (!conn->certsArray)
-  {
-   /*
-    * No keychain (yet), make a self-signed certificate...
-    */
-
-    if (make_certificate())
-      conn->certsArray = get_cdsa_server_certs();
-  }
-
-  if (!conn->certsArray)
-  {
-    cupsdLogMessage(CUPSD_LOG_ERROR,
-                   "EncryptClient: Could not find signing key in keychain "
-                   "\"%s\"", ServerCertificate);
-    error = errSSLBadCert; /* errSSLBadConfiguration is a better choice, but not available on 10.2.x */
-  }
-
-  if (!error)
-    error = SSLNewContext(true, &conn->session);
-
-  if (!error)
-    error = SSLSetIOFuncs(conn->session, _httpReadCDSA, _httpWriteCDSA);
+    if ((status = stat(filename, filestats)) != 0)
+    {
+     /*
+      * Drop the language prefix and try the root directory...
+      */
 
-  if (!error)
-    error = SSLSetProtocolVersionEnabled(conn->session, kSSLProtocol2, false);
+      language[0] = '\0';
+      snprintf(filename, len, "%s%s", DocumentRoot, con->uri);
 
-  if (!error)
-  {
-   /*
-    * Use a union to resolve warnings about int/pointer size mismatches...
-    */
+      if ((ptr = strchr(filename, '?')) != NULL)
+       *ptr = '\0';
 
-    u.connection = NULL;
-    u.sock       = con->http.fd;
-    error        = SSLSetConnection(conn->session, u.connection);
+      status = stat(filename, filestats);
+    }
   }
 
-  if (!error)
-    error = SSLSetAllowsExpiredCerts(conn->session, true);
-
-  if (!error)
-    error = SSLSetAllowsAnyRoot(conn->session, true);
-
-  if (!error)
-    error = SSLSetCertificate(conn->session, conn->certsArray);
+ /*
+  * If we're found a directory, get the index.html file instead...
+  */
 
-  if (!error)
+  if (!status && S_ISDIR(filestats->st_mode))
   {
    /*
-    * Perform SSL/TLS handshake
+    * Make sure the URI ends with a slash...
     */
 
-    while ((error = SSLHandshake(conn->session)) == errSSLWouldBlock)
-      usleep(1000);
-  }
-
-  if (error)
-  {
-    cupsdLogMessage(CUPSD_LOG_ERROR,
-                    "encrypt_client: Unable to encrypt connection from %s!",
-                    con->http.hostname);
-
-    cupsdLogMessage(CUPSD_LOG_ERROR, "encrypt_client: %s (%d)",
-                    cssmErrorString(error), (int)error);
-
-    con->http.error  = error;
-    con->http.status = HTTP_ERROR;
-
-    if (conn->session)
-      SSLDisposeContext(conn->session);
-
-    if (conn->certsArray)
-      CFRelease(conn->certsArray);
-
-    free(conn);
-
-    return (0);
-  }
-
-  cupsdLogMessage(CUPSD_LOG_DEBUG,
-                  "encrypt_client: %d Connection from %s now encrypted.",
-                  con->http.fd, con->http.hostname);
-
-  con->http.tls = conn;
-  return (1);
-
-#  endif /* HAVE_LIBSSL */
-}
-#endif /* HAVE_SSL */
-
+    if (con->uri[strlen(con->uri) - 1] != '/')
+      strlcat(con->uri, "/", sizeof(con->uri));
 
-#ifdef HAVE_CDSASSL
-/*
- * 'get_cdsa_server_certs()' - Convert a keychain name into the CFArrayRef
- *                            required by SSLSetCertificate.
- *
- * For now we assumes that there is exactly one SecIdentity in the
- * keychain - i.e. there is exactly one matching cert/private key pair.
- * In the future we will search a keychain for a SecIdentity matching a
- * specific criteria.  We also skip the operation of adding additional
- * non-signing certs from the keychain to the CFArrayRef.
- *
- * To create a self-signed certificate for testing use the certtool.
- * Executing the following as root will do it:
- *
- *     certtool c k=/Library/Keychains/System.keychain
- */
-
-static CFArrayRef                      /* O - Array of certificates */
-get_cdsa_server_certs(void)
-{
-  OSStatus             err;            /* Error info */
-  SecKeychainRef       kcRef;          /* Keychain reference */
-  SecIdentitySearchRef srchRef;        /* Search reference */
-  SecIdentityRef       identity;       /* Identity */
-  CFArrayRef           ca;             /* Certificate array */
-
-
-  kcRef    = NULL;
-  srchRef  = NULL;
-  identity = NULL;
-  ca      = NULL;
-  err      = SecKeychainOpen(ServerCertificate, &kcRef);
-
-  if (err)
-    cupsdLogMessage(CUPSD_LOG_ERROR, "Cannot open keychain \"%s\", error %d.",
-                   ServerCertificate, (int)err);
-  else
-  {
    /*
-    * Search for "any" identity matching specified key use; 
-    * in this app, we expect there to be exactly one. 
+    * Find the directory index file, trying every language...
     */
 
-    err = SecIdentitySearchCreate(kcRef, CSSM_KEYUSE_SIGN, &srchRef);
-
-    if (err)
-      cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                     "Cannot find signing key in keychain \"%s\", error %d",
-                     ServerCertificate, (int)err);
-    else
+    do
     {
-      err = SecIdentitySearchCopyNext(srchRef, &identity);
-
-      if (err)
-       cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                       "Cannot find signing key in keychain \"%s\", error %d",
-                       ServerCertificate, (int)err);
-      else
+      if (status && language[0])
       {
-       if (CFGetTypeID(identity) != SecIdentityGetTypeID())
-         cupsdLogMessage(CUPSD_LOG_ERROR,
-                         "SecIdentitySearchCopyNext CFTypeID failure!");
-       else
-       {
-        /* 
-         * Found one. Place it in a CFArray. 
-         * TBD: snag other (non-identity) certs from keychain and add them
-         * to array as well.
-         */
-
-         ca = CFArrayCreate(NULL, (const void **)&identity, 1, &kCFTypeArrayCallBacks);
-
-         if (ca == nil)
-           cupsdLogMessage(CUPSD_LOG_ERROR, "CFArrayCreate error");
-       }
+       /*
+        * Try a different language subset...
+       */
 
-       CFRelease(identity);
+       if (language[3])
+         language[0] = '\0';           /* Strip country code */
+       else
+         language[0] = '\0';           /* Strip language */
       }
 
-      CFRelease(srchRef);
-    }
-
-    CFRelease(kcRef);
-  }
-
-  return (ca);
-}
-#endif /* HAVE_CDSASSL */
-
-
-/*
- * 'get_file()' - Get a filename and state info.
- */
-
-static char *                          /* O  - Real filename */
-get_file(cupsd_client_t *con,          /* I  - Client connection */
-         struct stat    *filestats,    /* O  - File information */
-         char           *filename,     /* IO - Filename buffer */
-         int            len)           /* I  - Buffer length */
-{
-  int          status;                 /* Status of filesystem calls */
-  char         *ptr;                   /* Pointer info filename */
-  int          plen;                   /* Remaining length after pointer */
-
-
- /*
-  * Need to add DocumentRoot global...
-  */
-
-  if (!strncmp(con->uri, "/ppd/", 5))
-    snprintf(filename, len, "%s%s", ServerRoot, con->uri);
-  else if (!strncmp(con->uri, "/admin/conf/", 12))
-    snprintf(filename, len, "%s%s", ServerRoot, con->uri + 11);
-  else if (!strncmp(con->uri, "/admin/log/", 11))
-  {
-    if (!strcmp(con->uri + 11, "access_log") && AccessLog[0] == '/')
-      strlcpy(filename, AccessLog, len);
-    else if (!strcmp(con->uri + 11, "error_log") && ErrorLog[0] == '/')
-      strlcpy(filename, ErrorLog, len);
-    else if (!strcmp(con->uri + 11, "page_log") && PageLog[0] == '/')
-      strlcpy(filename, PageLog, len);
-    else
-      return (NULL);
-  }
-  else if (con->language)
-    snprintf(filename, len, "%s/%s%s", DocumentRoot, con->language->language,
-             con->uri);
-  else
-    snprintf(filename, len, "%s%s", DocumentRoot, con->uri);
-
-  if ((ptr = strchr(filename, '?')) != NULL)
-    *ptr = '\0';
-
- /*
-  * Grab the status for this language; if there isn't a language-specific file
-  * then fallback to the default one...
-  */
-
-  if ((status = stat(filename, filestats)) != 0 && con->language &&
-      strncmp(con->uri, "/ppd/", 5) &&
-      strncmp(con->uri, "/admin/conf/", 12) &&
-      strncmp(con->uri, "/admin/log/", 11))
-  {
-   /*
-    * Drop the country code...
-    */
-
-    char       ll[3];                  /* Short language name */
-
-
-    strlcpy(ll, con->language->language, sizeof(ll));
-    snprintf(filename, len, "%s/%s%s", DocumentRoot, ll, con->uri);
-
-    if ((ptr = strchr(filename, '?')) != NULL)
-      *ptr = '\0';
-
-    if ((status = stat(filename, filestats)) != 0)
-    {
      /*
-      * Drop the language prefix and try the root directory...
+      * Look for the index file...
       */
 
-      snprintf(filename, len, "%s%s", DocumentRoot, con->uri);
+      snprintf(filename, len, "%s%s%s", DocumentRoot, language, con->uri);
 
       if ((ptr = strchr(filename, '?')) != NULL)
        *ptr = '\0';
 
-      status = stat(filename, filestats);
-    }
-  }
+      ptr  = filename + strlen(filename);
+      plen = len - (ptr - filename);
 
- /*
-  * If we're found a directory, get the index.html file instead...
-  */
-
-  if (!status && S_ISDIR(filestats->st_mode))
-  {
-    if (filename[strlen(filename) - 1] != '/')
-      strlcat(filename, "/", len);
-
-    ptr  = filename + strlen(filename);
-    plen = len - (ptr - filename);
-
-    strlcpy(ptr, "index.html", plen);
-    status = stat(filename, filestats);
+      strlcpy(ptr, "index.html", plen);
+      status = stat(filename, filestats);
 
 #ifdef HAVE_JAVA
-    if (status)
-    {
-      strlcpy(ptr, "index.class", plen);
-      status = stat(filename, filestats);
-    }
+      if (status)
+      {
+       strlcpy(ptr, "index.class", plen);
+       status = stat(filename, filestats);
+      }
 #endif /* HAVE_JAVA */
 
 #ifdef HAVE_PERL
-    if (status)
-    {
-      strlcpy(ptr, "index.pl", plen);
-      status = stat(filename, filestats);
-    }
+      if (status)
+      {
+       strlcpy(ptr, "index.pl", plen);
+       status = stat(filename, filestats);
+      }
 #endif /* HAVE_PERL */
 
 #ifdef HAVE_PHP
-    if (status)
-    {
-      strlcpy(ptr, "index.php", plen);
-      status = stat(filename, filestats);
-    }
+      if (status)
+      {
+       strlcpy(ptr, "index.php", plen);
+       status = stat(filename, filestats);
+      }
 #endif /* HAVE_PHP */
 
 #ifdef HAVE_PYTHON
-    if (status)
-    {
-      strlcpy(ptr, "index.pyc", plen);
-      status = stat(filename, filestats);
-    }
+      if (status)
+      {
+       strlcpy(ptr, "index.pyc", plen);
+       status = stat(filename, filestats);
+      }
 
-    if (status)
-    {
-      strlcpy(ptr, "index.py", plen);
-      status = stat(filename, filestats);
-    }
+      if (status)
+      {
+       strlcpy(ptr, "index.py", plen);
+       status = stat(filename, filestats);
+      }
 #endif /* HAVE_PYTHON */
-  }
 
-  cupsdLogMessage(CUPSD_LOG_DEBUG2, "get_file: %d filename=%s size=%d",
-                  con->http.fd, filename,
-                 status ? -1 : (int)filestats->st_size);
+    }
+    while (status && language[0]);
+  }
 
-  if (!status)
-    con->http.data_remaining = (int)filestats->st_size;
+  cupsdLogMessage(CUPSD_LOG_DEBUG2,
+                  "[Client %d] get_file filestats=%p, filename=%p, len=%d, "
+                 "returning \"%s\".", con->http.fd, filestats, filename, len,
+                 status ? "(null)" : filename);
 
   if (status)
     return (NULL);
@@ -3035,66 +3432,42 @@ get_file(cupsd_client_t *con,           /* I  - Client connection */
 
 
 /*
- * 'install_conf_file()' - Install a configuration file.
+ * 'install_cupsd_conf()' - Install a configuration file.
  */
 
 static http_status_t                   /* O - Status */
-install_conf_file(cupsd_client_t *con) /* I - Connection */
+install_cupsd_conf(cupsd_client_t *con)        /* I - Connection */
 {
+  char         filename[1024];         /* Configuration filename */
   cups_file_t  *in,                    /* Input file */
                *out;                   /* Output file */
-  char         buffer[1024];           /* Copy buffer */
-  int          bytes;                  /* Number of bytes */
-  char         conffile[1024],         /* Configuration filename */
-               newfile[1024],          /* New config filename */
-               oldfile[1024];          /* Old config filename */
-  struct stat  confinfo;               /* Config file info */
-
-
- /*
-  * First construct the filenames...
-  */
+  char         buffer[16384];          /* Copy buffer */
+  ssize_t      bytes;                  /* Number of bytes */
 
-  snprintf(conffile, sizeof(conffile), "%s%s", ServerRoot, con->uri + 11);
-  snprintf(newfile, sizeof(newfile), "%s%s.N", ServerRoot, con->uri + 11);
-  snprintf(oldfile, sizeof(oldfile), "%s%s.O", ServerRoot, con->uri + 11);
-
-  cupsdLogMessage(CUPSD_LOG_INFO, "Installing config file \"%s\"...", conffile);
-
- /*
-  * Get the owner, group, and permissions of the configuration file.
-  * If it doesn't exist, assign it to the User and Group in the
-  * cupsd.conf file with mode 0640 permissions.
-  */
-
-  if (stat(conffile, &confinfo))
-  {
-    confinfo.st_uid  = User;
-    confinfo.st_gid  = Group;
-    confinfo.st_mode = ConfigFilePerm;
-  }
 
  /*
-  * Open the request file and new config file...
+  * Open the request file...
   */
 
   if ((in = cupsFileOpen(con->filename, "rb")) == NULL)
   {
-    cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to open request file \"%s\" - %s",
+    cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to open request file \"%s\": %s",
                     con->filename, strerror(errno));
     return (HTTP_SERVER_ERROR);
   }
 
-  if ((out = cupsFileOpen(newfile, "wb")) == NULL)
+ /*
+  * Open the new config file...
+  */
+
+  if ((out = cupsdCreateConfFile(ConfigurationFile, ConfigFilePerm)) == NULL)
   {
     cupsFileClose(in);
-    cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to open config file \"%s\" - %s",
-                    newfile, strerror(errno));
     return (HTTP_SERVER_ERROR);
   }
 
-  fchmod(cupsFileNumber(out), confinfo.st_mode);
-  fchown(cupsFileNumber(out), confinfo.st_uid, confinfo.st_gid);
+  cupsdLogMessage(CUPSD_LOG_INFO, "Installing config file \"%s\"...",
+                  ConfigurationFile);
 
  /*
   * Copy from the request to the new config file...
@@ -3104,12 +3477,14 @@ install_conf_file(cupsd_client_t *con)  /* I - Connection */
     if (cupsFileWrite(out, buffer, bytes) < bytes)
     {
       cupsdLogMessage(CUPSD_LOG_ERROR,
-                      "Unable to copy to config file \"%s\" - %s",
-                     newfile, strerror(errno));
+                      "Unable to copy to config file \"%s\": %s",
+                     ConfigurationFile, strerror(errno));
 
       cupsFileClose(in);
       cupsFileClose(out);
-      unlink(newfile);
+
+      snprintf(filename, sizeof(filename), "%s.N", ConfigurationFile);
+      cupsdUnlinkOrRemoveFile(filename);
 
       return (HTTP_SERVER_ERROR);
     }
@@ -3119,74 +3494,22 @@ install_conf_file(cupsd_client_t *con)  /* I - Connection */
   */
 
   cupsFileClose(in);
-  if (cupsFileClose(out))
-  {
-    cupsdLogMessage(CUPSD_LOG_ERROR,
-                    "Error file closing config file \"%s\" - %s",
-                    newfile, strerror(errno));
-
-    unlink(newfile);
 
+  if (cupsdCloseCreatedConfFile(out, ConfigurationFile))
     return (HTTP_SERVER_ERROR);
-  }
 
  /*
   * Remove the request file...
   */
 
-  unlink(con->filename);
+  cupsdUnlinkOrRemoveFile(con->filename);
   cupsdClearString(&con->filename);
 
  /*
-  * Unlink the old backup, rename the current config file to the backup
-  * filename, and rename the new config file to the config file name...
-  */
-
-  if (unlink(oldfile))
-    if (errno != ENOENT)
-    {
-      cupsdLogMessage(CUPSD_LOG_ERROR,
-                      "Unable to remove backup config file \"%s\" - %s",
-                     oldfile, strerror(errno));
-
-      unlink(newfile);
-
-      return (HTTP_SERVER_ERROR);
-    }
-
-  if (rename(conffile, oldfile))
-    if (errno != ENOENT)
-    {
-      cupsdLogMessage(CUPSD_LOG_ERROR,
-                      "Unable to rename old config file \"%s\" - %s",
-                     conffile, strerror(errno));
-
-      unlink(newfile);
-
-      return (HTTP_SERVER_ERROR);
-    }
-
-  if (rename(newfile, conffile))
-  {
-    cupsdLogMessage(CUPSD_LOG_ERROR,
-                    "Unable to rename new config file \"%s\" - %s",
-                    newfile, strerror(errno));
-
-    rename(oldfile, conffile);
-    unlink(newfile);
-
-    return (HTTP_SERVER_ERROR);
-  }
-
- /*
-  * If the cupsd.conf file was updated, set the NeedReload flag...
+  * Set the NeedReload flag...
   */
 
-  if (!strcmp(con->uri, "/admin/conf/cupsd.conf"))
-    NeedReload = RELOAD_CUPSD;
-  else
-    NeedReload = RELOAD_ALL;
-
+  NeedReload = RELOAD_CUPSD;
   ReloadTime = time(NULL);
 
  /*
@@ -3210,29 +3533,31 @@ is_cgi(cupsd_client_t *con,             /* I - Client connection */
   const char   *options;               /* Options on URL */
 
 
-  cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                  "is_cgi(con=%p, filename=\"%s\", filestats=%p, type=%s/%s)\n",
-                 con, filename, filestats, type ? type->super : "unknown",
-                 type ? type->type : "unknown");
-
  /*
   * Get the options, if any...
   */
 
   if ((options = strchr(con->uri, '?')) != NULL)
+  {
     options ++;
+    cupsdSetStringf(&(con->query_string), "QUERY_STRING=%s", options);
+  }
 
  /*
   * Check for known types...
   */
 
-  if (!type || strcasecmp(type->super, "application"))
+  if (!type || _cups_strcasecmp(type->super, "application"))
   {
-    cupsdLogMessage(CUPSD_LOG_DEBUG2, "is_cgi: Returning 0...");
+    cupsdLogMessage(CUPSD_LOG_DEBUG2,
+                   "[Client %d] is_cgi filename=\"%s\", filestats=%p, "
+                   "type=%s/%s, returning 0", con->http.fd, filename,
+                   filestats, type ? type->super : "unknown",
+                   type ? type->type : "unknown");
     return (0);
   }
 
-  if (!strcasecmp(type->type, "x-httpd-cgi") &&
+  if (!_cups_strcasecmp(type->type, "x-httpd-cgi") &&
       (filestats->st_mode & 0111))
   {
    /*
@@ -3241,18 +3566,17 @@ is_cgi(cupsd_client_t *con,             /* I - Client connection */
 
     cupsdSetString(&con->command, filename);
 
-    filename = strrchr(filename, '/') + 1; /* Filename always absolute */
-
-    cupsdSetString(&con->options, options);
+    if (options)
+      cupsdSetStringf(&con->options, " %s", options);
 
     cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                    "is_cgi: Returning 1 with command=\"%s\" and options=\"%s\"",
-                    con->command, con->options);
-
+                   "[Client %d] is_cgi filename=\"%s\", filestats=%p, "
+                   "type=%s/%s, returning 1", con->http.fd, filename,
+                   filestats, type->super, type->type);
     return (1);
   }
 #ifdef HAVE_JAVA
-  else if (!strcasecmp(type->type, "x-httpd-java"))
+  else if (!_cups_strcasecmp(type->type, "x-httpd-java"))
   {
    /*
     * "application/x-httpd-java" is a Java servlet.
@@ -3261,19 +3585,19 @@ is_cgi(cupsd_client_t *con,             /* I - Client connection */
     cupsdSetString(&con->command, CUPS_JAVA);
 
     if (options)
-      cupsdSetStringf(&con->options, "%s %s", filename, options);
+      cupsdSetStringf(&con->options, " %s %s", filename, options);
     else
-      cupsdSetString(&con->options, filename);
+      cupsdSetStringf(&con->options, " %s", filename);
 
     cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                    "is_cgi: Returning 1 with command=\"%s\" and options=\"%s\"",
-                    con->command, con->options);
-
+                   "[Client %d] is_cgi filename=\"%s\", filestats=%p, "
+                   "type=%s/%s, returning 1", con->http.fd, filename,
+                   filestats, type->super, type->type);
     return (1);
   }
 #endif /* HAVE_JAVA */
 #ifdef HAVE_PERL
-  else if (!strcasecmp(type->type, "x-httpd-perl"))
+  else if (!_cups_strcasecmp(type->type, "x-httpd-perl"))
   {
    /*
     * "application/x-httpd-perl" is a Perl page.
@@ -3282,517 +3606,101 @@ is_cgi(cupsd_client_t *con,           /* I - Client connection */
     cupsdSetString(&con->command, CUPS_PERL);
 
     if (options)
-      cupsdSetStringf(&con->options, "%s %s", filename, options);
+      cupsdSetStringf(&con->options, " %s %s", filename, options);
     else
-      cupsdSetString(&con->options, filename);
+      cupsdSetStringf(&con->options, " %s", filename);
 
     cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                    "is_cgi: Returning 1 with command=\"%s\" and options=\"%s\"",
-                    con->command, con->options);
-
+                   "[Client %d] is_cgi filename=\"%s\", filestats=%p, "
+                   "type=%s/%s, returning 1", con->http.fd, filename,
+                   filestats, type->super, type->type);
     return (1);
   }
 #endif /* HAVE_PERL */
 #ifdef HAVE_PHP
-  else if (!strcasecmp(type->type, "x-httpd-php"))
-  {
-   /*
-    * "application/x-httpd-php" is a PHP page.
-    */
-
-    cupsdSetString(&con->command, CUPS_PHP);
-
-    if (options)
-      cupsdSetStringf(&con->options, "%s %s", filename, options);
-    else
-      cupsdSetString(&con->options, filename);
-
-    cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                    "is_cgi: Returning 1 with command=\"%s\" and options=\"%s\"",
-                    con->command, con->options);
-
-    return (1);
-  }
-#endif /* HAVE_PHP */
-#ifdef HAVE_PYTHON
-  else if (!strcasecmp(type->type, "x-httpd-python"))
-  {
-   /*
-    * "application/x-httpd-python" is a Python page.
-    */
-
-    cupsdSetString(&con->command, CUPS_PYTHON);
-
-    if (options)
-      cupsdSetStringf(&con->options, "%s %s", filename, options);
-    else
-      cupsdSetString(&con->options, filename);
-
-    cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                    "is_cgi: Returning 1 with command=\"%s\" and options=\"%s\"",
-                    con->command, con->options);
-
-    return (1);
-  }
-#endif /* HAVE_PYTHON */
-
-  cupsdLogMessage(CUPSD_LOG_DEBUG2, "is_cgi: Returning 0...");
-
-  return (0);
-}
-
-
-/*
- * 'is_path_absolute()' - Is a path absolute and free of relative elements (i.e. "..").
- */
-
-static int                             /* O - 0 if relative, 1 if absolute */
-is_path_absolute(const char *path)     /* I - Input path */
-{
- /*
-  * Check for a leading slash...
-  */
-
-  if (path[0] != '/')
-    return (0);
-
- /*
-  * Check for "/.." in the path...
-  */
-
-  while ((path = strstr(path, "/..")) != NULL)
-  {
-    if (!path[3] || path[3] == '/')
-      return (0);
-
-    path ++;
-  }
-
- /*
-  * If we haven't found any relative paths, return 1 indicating an
-  * absolute path...
-  */
-
-  return (1);
-}
-
-
-#ifdef HAVE_SSL
-/*
- * 'make_certificate()' - Make a self-signed SSL/TLS certificate.
- */
-
-static int                             /* O - 1 on success, 0 on failure */
-make_certificate(void)
-{
-#if defined(HAVE_LIBSSL) && defined(HAVE_WAITPID)
-  int          pid,                    /* Process ID of command */
-               status;                 /* Status of command */
-  char         command[1024],          /* Command */
-               *argv[11],              /* Command-line arguments */
-               *envp[MAX_ENV + 1],     /* Environment variables */
-               home[1024],             /* HOME environment variable */
-               infofile[1024],         /* Type-in information for cert */
-               seedfile[1024];         /* Random number seed file */
-  int          envc,                   /* Number of environment variables */
-               bytes;                  /* Bytes written */
-  cups_file_t  *fp;                    /* Seed/info file */
-  int          infofd;                 /* Info file descriptor */
-
-
- /*
-  * Run the "openssl" command to seed the random number generator and
-  * generate a self-signed certificate that is good for 10 years:
-  *
-  *     openssl rand -rand seedfile 1
-  *
-  *     openssl req -new -x509 -keyout ServerKey \
-  *             -out ServerCertificate -days 3650 -nodes
-  *
-  * The seeding step is crucial in ensuring that the openssl command
-  * does not block on systems without sufficient entropy...
-  */
-
-  if (!cupsFileFind("openssl", getenv("PATH"), 1, command, sizeof(command)))
+  else if (!_cups_strcasecmp(type->type, "x-httpd-php"))
   {
-    cupsdLogMessage(CUPSD_LOG_ERROR,
-                    "No SSL certificate and openssl command not found!");
-    return (0);
-  }
-
-  if (access("/dev/urandom", 0))
-  {
-   /*
-    * If the system doesn't provide /dev/urandom, then any random source
-    * will probably be blocking-style, so generate some random data to
-    * use as a seed for the certificate.  Note that we have already
-    * seeded the random number generator in cupsdInitCerts()...
-    */
-
-    cupsdLogMessage(CUPSD_LOG_INFO,
-                    "Seeding the random number generator...");
-
-    snprintf(home, sizeof(home), "HOME=%s", TempDir);
-
-   /*
-    * Write the seed file...
-    */
-
-    if ((fp = cupsTempFile2(seedfile, sizeof(seedfile))) == NULL)
-    {
-      cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to create seed file %s - %s",
-                      seedfile, strerror(errno));
-      return (0);
-    }
-
-    for (bytes = 0; bytes < 262144; bytes ++)
-      cupsFilePutChar(fp, random());
-
-    cupsFileClose(fp);
-
-   /*
-    * Run the openssl command to seed its random number generator...
-    */
-
-    argv[0] = "openssl";
-    argv[1] = "rand";
-    argv[2] = "-rand";
-    argv[3] = seedfile;
-    argv[4] = "1";
-    argv[5] = NULL;
-
-    envc = cupsdLoadEnv(envp, MAX_ENV);
-    envp[envc++] = home;
-    envp[envc]   = NULL;
-
-    if (!cupsdStartProcess(command, argv, envp, -1, -1, -1, -1, 1, &pid))
-    {
-      unlink(seedfile);
-      return (0);
-    }
-
-    while (waitpid(pid, &status, 0) < 0)
-      if (errno != EINTR)
-      {
-       status = 1;
-       break;
-      }
-
-    cupsdFinishProcess(pid, command, sizeof(command));
-
    /*
-    * Remove the seed file, as it is no longer needed...
-    */
-
-    unlink(seedfile);
-
-    if (status)
-    {
-      if (WIFEXITED(status))
-       cupsdLogMessage(CUPSD_LOG_ERROR,
-                       "Unable to seed random number generator - "
-                       "the openssl command stopped with status %d!",
-                       WEXITSTATUS(status));
-      else
-       cupsdLogMessage(CUPSD_LOG_ERROR,
-                       "Unable to seed random number generator - "
-                       "the openssl command crashed on signal %d!",
-                       WTERMSIG(status));
-
-      return (0);
-    }
-  }
-
- /*
-  * Create a file with the certificate information fields...
-  *
-  * Note: This assumes that the default questions are asked by the openssl
-  * command...
-  */
-
-  if ((fp = cupsTempFile2(infofile, sizeof(infofile))) == NULL)
-  {
-    cupsdLogMessage(CUPSD_LOG_ERROR,
-                    "Unable to create certificate information file %s - %s",
-                    infofile, strerror(errno));
-    return (0);
-  }
-
-  cupsFilePrintf(fp, ".\n.\n.\n%s\n.\n%s\n%s\n",
-                 ServerName, ServerName, ServerAdmin);
-  cupsFileClose(fp);
-
-  cupsdLogMessage(CUPSD_LOG_INFO,
-                  "Generating SSL server key and certificate...");
-
-  argv[0]  = "openssl";
-  argv[1]  = "req";
-  argv[2]  = "-new";
-  argv[3]  = "-x509";
-  argv[4]  = "-keyout";
-  argv[5]  = ServerKey;
-  argv[6]  = "-out";
-  argv[7]  = ServerCertificate;
-  argv[8]  = "-days";
-  argv[9]  = "3650";
-  argv[10] = "-nodes";
-  argv[11] = NULL;
-
-  cupsdLoadEnv(envp, MAX_ENV);
-
-  infofd = open(infofile, O_RDONLY);
-
-  if (!cupsdStartProcess(command, argv, envp, infofd, -1, -1, -1, 1, &pid))
-  {
-    close(infofd);
-    unlink(infofile);
-    return (0);
-  }
-
-  close(infofd);
-  unlink(infofile);
-
-  while (waitpid(pid, &status, 0) < 0)
-    if (errno != EINTR)
-    {
-      status = 1;
-      break;
-    }
+    * "application/x-httpd-php" is a PHP page.
+    */
 
-  cupsdFinishProcess(pid, command, sizeof(command));
+    cupsdSetString(&con->command, CUPS_PHP);
 
-  if (status)
-  {
-    if (WIFEXITED(status))
-      cupsdLogMessage(CUPSD_LOG_ERROR,
-                      "Unable to create SSL server key and certificate - "
-                     "the openssl command stopped with status %d!",
-                     WEXITSTATUS(status));
+    if (options)
+      cupsdSetStringf(&con->options, " %s %s", filename, options);
     else
-      cupsdLogMessage(CUPSD_LOG_ERROR,
-                      "Unable to create SSL server key and certificate - "
-                     "the openssl command crashed on signal %d!",
-                     WTERMSIG(status));
+      cupsdSetStringf(&con->options, " %s", filename);
+
+    cupsdLogMessage(CUPSD_LOG_DEBUG2,
+                   "[Client %d] is_cgi filename=\"%s\", filestats=%p, "
+                   "type=%s/%s, returning 1", con->http.fd, filename,
+                   filestats, type->super, type->type);
+    return (1);
   }
-  else
+#endif /* HAVE_PHP */
+#ifdef HAVE_PYTHON
+  else if (!_cups_strcasecmp(type->type, "x-httpd-python"))
   {
-    cupsdLogMessage(CUPSD_LOG_INFO, "Created SSL server key file \"%s\"...",
-                   ServerKey);
-    cupsdLogMessage(CUPSD_LOG_INFO,
-                    "Created SSL server certificate file \"%s\"...",
-                   ServerCertificate);
-  }
+   /*
+    * "application/x-httpd-python" is a Python page.
+    */
 
-  return (!status);
+    cupsdSetString(&con->command, CUPS_PYTHON);
 
-#elif defined(HAVE_GNUTLS)
-  gnutls_x509_crt      crt;            /* Self-signed certificate */
-  gnutls_x509_privkey  key;            /* Encryption key */
-  cups_lang_t          *language;      /* Default language info */
-  cups_file_t          *fp;            /* Key/cert file */
-  unsigned char                buffer[8192];   /* Buffer for x509 data */
-  size_t               bytes;          /* Number of bytes of data */
-  unsigned char                serial[4];      /* Serial number buffer */
-  time_t               curtime;        /* Current time */
-  int                  result;         /* Result of GNU TLS calls */
+    if (options)
+      cupsdSetStringf(&con->options, " %s %s", filename, options);
+    else
+      cupsdSetStringf(&con->options, " %s", filename);
 
+    cupsdLogMessage(CUPSD_LOG_DEBUG2,
+                   "[Client %d] is_cgi filename=\"%s\", filestats=%p, "
+                   "type=%s/%s, returning 1", con->http.fd, filename,
+                   filestats, type->super, type->type);
+    return (1);
+  }
+#endif /* HAVE_PYTHON */
 
- /*
-  * Create the encryption key...
-  */
+  cupsdLogMessage(CUPSD_LOG_DEBUG2,
+                 "[Client %d] is_cgi filename=\"%s\", filestats=%p, "
+                 "type=%s/%s, returning 0", con->http.fd, filename,
+                 filestats, type->super, type->type);
+  return (0);
+}
 
-  cupsdLogMessage(CUPSD_LOG_INFO, "Generating SSL server key...");
 
-  gnutls_x509_privkey_init(&key);
-  gnutls_x509_privkey_generate(key, GNUTLS_PK_RSA, 2048, 0);
+/*
+ * 'is_path_absolute()' - Is a path absolute and free of relative elements (i.e. "..").
+ */
 
+static int                             /* O - 0 if relative, 1 if absolute */
+is_path_absolute(const char *path)     /* I - Input path */
+{
  /*
-  * Save it...
+  * Check for a leading slash...
   */
 
-  bytes = sizeof(buffer);
-
-  if ((result = gnutls_x509_privkey_export(key, GNUTLS_X509_FMT_PEM,
-                                           buffer, &bytes)) < 0)
-  {
-    cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to export SSL server key - %s",
-                    gnutls_strerror(result));
-    gnutls_x509_privkey_deinit(key);
-    return (0);
-  }
-  else if ((fp = cupsFileOpen(ServerKey, "w")) != NULL)
-  {
-    cupsFileWrite(fp, (char *)buffer, bytes);
-    cupsFileClose(fp);
-
-    cupsdLogMessage(CUPSD_LOG_INFO, "Created SSL server key file \"%s\"...",
-                   ServerKey);
-  }
-  else
-  {
-    cupsdLogMessage(CUPSD_LOG_ERROR,
-                    "Unable to create SSL server key file \"%s\" - %s",
-                   ServerKey, strerror(errno));
-    gnutls_x509_privkey_deinit(key);
+  if (path[0] != '/')
     return (0);
-  }
-
- /*
-  * Create the self-signed certificate...
-  */
-
-  cupsdLogMessage(CUPSD_LOG_INFO, "Generating self-signed SSL certificate...");
-
-  language  = cupsLangDefault();
-  curtime   = time(NULL);
-  serial[0] = curtime >> 24;
-  serial[1] = curtime >> 16;
-  serial[2] = curtime >> 8;
-  serial[3] = curtime;
-
-  gnutls_x509_crt_init(&crt);
-  if (strlen(language->language) == 5)
-    gnutls_x509_crt_set_dn_by_oid(crt, GNUTLS_OID_X520_COUNTRY_NAME, 0,
-                                  language->language + 3, 2);
-  else
-    gnutls_x509_crt_set_dn_by_oid(crt, GNUTLS_OID_X520_COUNTRY_NAME, 0,
-                                  "US", 2);
-  gnutls_x509_crt_set_dn_by_oid(crt, GNUTLS_OID_X520_COMMON_NAME, 0,
-                                ServerName, strlen(ServerName));
-  gnutls_x509_crt_set_dn_by_oid(crt, GNUTLS_OID_X520_ORGANIZATION_NAME, 0,
-                                ServerName, strlen(ServerName));
-  gnutls_x509_crt_set_dn_by_oid(crt, GNUTLS_OID_X520_ORGANIZATIONAL_UNIT_NAME,
-                                0, "Unknown", 7);
-  gnutls_x509_crt_set_dn_by_oid(crt, GNUTLS_OID_X520_STATE_OR_PROVINCE_NAME, 0,
-                                "Unknown", 7);
-  gnutls_x509_crt_set_dn_by_oid(crt, GNUTLS_OID_X520_LOCALITY_NAME, 0,
-                                "Unknown", 7);
-  gnutls_x509_crt_set_dn_by_oid(crt, GNUTLS_OID_PKCS9_EMAIL, 0,
-                                ServerAdmin, strlen(ServerAdmin));
-  gnutls_x509_crt_set_key(crt, key);
-  gnutls_x509_crt_set_serial(crt, serial, sizeof(serial));
-  gnutls_x509_crt_set_activation_time(crt, curtime);
-  gnutls_x509_crt_set_expiration_time(crt, curtime + 10 * 365 * 86400);
-  gnutls_x509_crt_set_ca_status(crt, 0);
-  gnutls_x509_crt_set_subject_alternative_name(crt, GNUTLS_SAN_DNSNAME,
-                                               ServerName);
-  gnutls_x509_crt_set_key_purpose_oid(crt, GNUTLS_KP_TLS_WWW_SERVER, 0);
-  gnutls_x509_crt_set_key_usage(crt, GNUTLS_KEY_KEY_ENCIPHERMENT);
-  gnutls_x509_crt_set_version(crt, 3);
-
-  bytes = sizeof(buffer);
-  if (gnutls_x509_crt_get_key_id(crt, 0, buffer, &bytes) >= 0)
-    gnutls_x509_crt_set_subject_key_id(crt, buffer, bytes);
-
-  gnutls_x509_crt_sign(crt, crt, key);
 
  /*
-  * Save it...
+  * Check for "/.." in the path...
   */
 
-  bytes = sizeof(buffer);
-  if ((result = gnutls_x509_crt_export(crt, GNUTLS_X509_FMT_PEM,
-                                       buffer, &bytes)) < 0)
-    cupsdLogMessage(CUPSD_LOG_ERROR,
-                    "Unable to export SSL server certificate - %s",
-                   gnutls_strerror(result));
-  else if ((fp = cupsFileOpen(ServerCertificate, "w")) != NULL)
+  while ((path = strstr(path, "/..")) != NULL)
   {
-    cupsFileWrite(fp, (char *)buffer, bytes);
-    cupsFileClose(fp);
+    if (!path[3] || path[3] == '/')
+      return (0);
 
-    cupsdLogMessage(CUPSD_LOG_INFO,
-                    "Created SSL server certificate file \"%s\"...",
-                   ServerCertificate);
+    path ++;
   }
-  else
-    cupsdLogMessage(CUPSD_LOG_ERROR,
-                    "Unable to create SSL server certificate file \"%s\" - %s",
-                   ServerCertificate, strerror(errno));
 
  /*
-  * Cleanup...
+  * If we haven't found any relative paths, return 1 indicating an
+  * absolute path...
   */
 
-  gnutls_x509_crt_deinit(crt);
-  gnutls_x509_privkey_deinit(key);
-
   return (1);
-
-#elif defined(HAVE_CDSASSL) && defined(HAVE_WAITPID)
-  int  pid,                            /* Process ID of command */
-       status;                         /* Status of command */
-  char command[1024],                  /* Command */
-       keychain[1024],                 /* Keychain argument */
-       *argv[5],                       /* Command-line arguments */
-       *envp[MAX_ENV];                 /* Environment variables */
-
-
- /*
-  * Run the "certtool" command to generate a self-signed certificate:
-  *
-  *     certtool c Z k=ServerCertificate
-  */
-
-  if (!cupsFileFind("certtool", getenv("PATH"), 1, command, sizeof(command)))
-  {
-    cupsdLogMessage(CUPSD_LOG_ERROR,
-                    "No SSL certificate and certtool command not found!");
-    return (0);
-  }
-
-  cupsdLogMessage(CUPSD_LOG_INFO,
-                  "Generating SSL server key and certificate...");
-
-  snprintf(keychain, sizeof(keychain), "k=%s", ServerCertificate);
-
-  argv[0] = "certtool";
-  argv[1] = "c";
-  argv[2] = "Z";
-  argv[3] = keychain;
-  argv[4] = NULL;
-
-  cupsdLoadEnv(envp, MAX_ENV);
-
-  if (!cupsdStartProcess(command, argv, envp, -1, -1, -1, -1, 1, &pid))
-    return (0);
-
-  while (waitpid(pid, &status, 0) < 0)
-    if (errno != EINTR)
-    {
-      status = 1;
-      break;
-    }
-
-  cupsdFinishProcess(pid, command, sizeof(command));
-
-  if (status)
-  {
-    if (WIFEXITED(status))
-      cupsdLogMessage(CUPSD_LOG_ERROR,
-                      "Unable to create SSL server key and certificate - "
-                     "the certtool command stopped with status %d!",
-                     WEXITSTATUS(status));
-    else
-      cupsdLogMessage(CUPSD_LOG_ERROR,
-                      "Unable to create SSL server key and certificate - "
-                     "the certtool command crashed on signal %d!",
-                     WTERMSIG(status));
-  }
-  else
-  {
-    cupsdLogMessage(CUPSD_LOG_INFO,
-                    "Created SSL server certificate file \"%s\"...",
-                   ServerCertificate);
-  }
-
-  return (!status);
-
-#else
-  return (0);
-#endif /* HAVE_LIBSSL && HAVE_WAITPID */
 }
-#endif /* HAVE_SSL */
 
 
 /*
@@ -3817,20 +3725,23 @@ pipe_command(cupsd_client_t *con,       /* I - Client connection */
   int          envc;                   /* Number of environment variables */
   char         argbuf[10240],          /* Argument buffer */
                *argv[100],             /* Argument strings */
-               *envp[MAX_ENV + 17];    /* Environment variables */
-  char         content_length[1024],   /* CONTENT_LENGTH environment variable */
+               *envp[MAX_ENV + 20];    /* Environment variables */
+  char         auth_type[256],         /* AUTH_TYPE environment variable */
+               content_length[1024],   /* CONTENT_LENGTH environment variable */
                content_type[1024],     /* CONTENT_TYPE environment variable */
                http_cookie[32768],     /* HTTP_COOKIE environment variable */
+               http_referer[1024],     /* HTTP_REFERER environment variable */
                http_user_agent[1024],  /* HTTP_USER_AGENT environment variable */
                lang[1024],             /* LANG environment variable */
                path_info[1024],        /* PATH_INFO environment variable */
-               *query_string,          /* QUERY_STRING env variable */
                remote_addr[1024],      /* REMOTE_ADDR environment variable */
                remote_host[1024],      /* REMOTE_HOST environment variable */
                remote_user[1024],      /* REMOTE_USER environment variable */
+               script_filename[1024],  /* SCRIPT_FILENAME environment variable */
                script_name[1024],      /* SCRIPT_NAME environment variable */
                server_name[1024],      /* SERVER_NAME environment variable */
                server_port[1024];      /* SERVER_PORT environment variable */
+  ipp_attribute_t *attr;               /* attributes-natural-language attribute */
 
 
  /*
@@ -3852,14 +3763,20 @@ pipe_command(cupsd_client_t *con,       /* I - Client connection */
   */
 
   cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                  "pipe_command: command=\"%s\", options=\"%s\"",
-                  command, options ? options : "(null)");
+                  "[Client %d] pipe_command infile=%d, outfile=%p, "
+                 "command=\"%s\", options=\"%s\", root=%d",
+                  con->http.fd, infile, outfile, command,
+                 options ? options : "(null)", root);
 
-  argv[0]      = command;
-  query_string = NULL;
+  argv[0] = command;
 
   if (options)
-    strlcpy(argbuf, options, sizeof(argbuf));
+  {
+    commptr = options;
+    if (*commptr == ' ')
+      commptr ++;
+    strlcpy(argbuf, commptr, sizeof(argbuf));
+  }
   else
     argbuf[0] = '\0';
 
@@ -3881,12 +3798,15 @@ pipe_command(cupsd_client_t *con,       /* I - Client connection */
   {
     commptr      = argbuf;
     path_info[0] = '\0';
+
+    if (*commptr == ' ')
+      commptr ++;
   }
 
-  if (*commptr == '?' && con->operation == HTTP_GET)
+  if (*commptr == '?' && con->operation == HTTP_STATE_GET && !con->query_string)
   {
     commptr ++;
-    cupsdSetStringf(&query_string, "QUERY_STRING=%s", commptr);
+    cupsdSetStringf(&(con->query_string), "QUERY_STRING=%s", commptr);
   }
 
   argc = 1;
@@ -3953,12 +3873,60 @@ pipe_command(cupsd_client_t *con,       /* I - Client connection */
   * Setup the environment variables as needed...
   */
 
-  if (con->language)
-    snprintf(lang, sizeof(lang), "LANG=%s.UTF-8", con->language->language);
+  if (con->username[0])
+  {
+    snprintf(auth_type, sizeof(auth_type), "AUTH_TYPE=%s",
+             httpGetField(HTTP(con), HTTP_FIELD_AUTHORIZATION));
+
+    if ((uriptr = strchr(auth_type + 10, ' ')) != NULL)
+      *uriptr = '\0';
+  }
+  else
+    auth_type[0] = '\0';
+
+  if (con->request &&
+      (attr = ippFindAttribute(con->request, "attributes-natural-language",
+                               IPP_TAG_LANGUAGE)) != NULL)
+  {
+    switch (strlen(attr->values[0].string.text))
+    {
+      default :
+        /*
+         * This is an unknown or badly formatted language code; use
+         * the POSIX locale...
+         */
+
+         strlcpy(lang, "LANG=C", sizeof(lang));
+         break;
+
+      case 2 :
+        /*
+         * Just the language code (ll)...
+         */
+
+         snprintf(lang, sizeof(lang), "LANG=%s.UTF8",
+                  attr->values[0].string.text);
+         break;
+
+      case 5 :
+        /*
+         * Language and country code (ll-cc)...
+         */
+
+         snprintf(lang, sizeof(lang), "LANG=%c%c_%c%c.UTF8",
+                  attr->values[0].string.text[0],
+                  attr->values[0].string.text[1],
+                  toupper(attr->values[0].string.text[3] & 255),
+                  toupper(attr->values[0].string.text[4] & 255));
+         break;
+    }
+  }
+  else if (con->language)
+    snprintf(lang, sizeof(lang), "LANG=%s.UTF8", con->language->language);
   else
-    strcpy(lang, "LANG=C");
+    strlcpy(lang, "LANG=C", sizeof(lang));
 
-  strcpy(remote_addr, "REMOTE_ADDR=");
+  strlcpy(remote_addr, "REMOTE_ADDR=", sizeof(remote_addr));
   httpAddrString(con->http.hostaddr, remote_addr + 12,
                  sizeof(remote_addr) - 12);
 
@@ -3969,20 +3937,38 @@ pipe_command(cupsd_client_t *con,       /* I - Client connection */
   if ((uriptr = strchr(script_name, '?')) != NULL)
     *uriptr = '\0';
 
+  snprintf(script_filename, sizeof(script_filename), "SCRIPT_FILENAME=%s%s",
+           DocumentRoot, script_name + 12);
+
   sprintf(server_port, "SERVER_PORT=%d", con->serverport);
 
-  snprintf(server_name, sizeof(server_name), "SERVER_NAME=%s",
-           con->servername);
+  if (con->http.fields[HTTP_FIELD_HOST][0])
+  {
+    char *nameptr;                     /* Pointer to ":port" */
+
+    snprintf(server_name, sizeof(server_name), "SERVER_NAME=%s",
+            con->http.fields[HTTP_FIELD_HOST]);
+    if ((nameptr = strrchr(server_name, ':')) != NULL && !strchr(nameptr, ']'))
+      *nameptr = '\0';                 /* Strip trailing ":port" */
+  }
+  else
+    snprintf(server_name, sizeof(server_name), "SERVER_NAME=%s",
+            con->servername);
 
   envc = cupsdLoadEnv(envp, (int)(sizeof(envp) / sizeof(envp[0])));
 
+  if (auth_type[0])
+    envp[envc ++] = auth_type;
+
   envp[envc ++] = lang;
   envp[envc ++] = "REDIRECT_STATUS=1";
+  envp[envc ++] = "GATEWAY_INTERFACE=CGI/1.1";
   envp[envc ++] = server_name;
   envp[envc ++] = server_port;
   envp[envc ++] = remote_addr;
   envp[envc ++] = remote_host;
   envp[envc ++] = script_name;
+  envp[envc ++] = script_filename;
 
   if (path_info[0])
     envp[envc ++] = path_info;
@@ -4015,21 +4001,27 @@ pipe_command(cupsd_client_t *con,       /* I - Client connection */
     envp[envc ++] = http_user_agent;
   }
 
-  if (con->operation == HTTP_GET)
+  if (con->http.fields[HTTP_FIELD_REFERER][0])
   {
-    for (i = 0; i < argc; i ++)
-      cupsdLogMessage(CUPSD_LOG_DEBUG2, "argv[%d] = \"%s\"", i, argv[i]);
+    snprintf(http_referer, sizeof(http_referer), "HTTP_REFERER=%s",
+             con->http.fields[HTTP_FIELD_REFERER]);
+    envp[envc ++] = http_referer;
+  }
 
+  if (con->operation == HTTP_STATE_GET)
+  {
     envp[envc ++] = "REQUEST_METHOD=GET";
 
-    if (query_string)
+    if (con->query_string)
     {
      /*
       * Add GET form variables after ?...
       */
 
-      envp[envc ++] = query_string;
+      envp[envc ++] = con->query_string;
     }
+    else
+      envp[envc ++] = "QUERY_STRING=";
   }
   else
   {
@@ -4056,14 +4048,14 @@ pipe_command(cupsd_client_t *con,       /* I - Client connection */
 
   envp[envc] = NULL;
 
-  if (LogLevel == CUPSD_LOG_DEBUG2)
+  if (LogLevel >= CUPSD_LOG_DEBUG)
   {
     for (i = 0; i < argc; i ++)
-      cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                      "pipe_command: argv[%d] = \"%s\"", i, argv[i]);
+      cupsdLogMessage(CUPSD_LOG_DEBUG,
+                      "[CGI] argv[%d] = \"%s\"", i, argv[i]);
     for (i = 0; i < envc; i ++)
-      cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                      "pipe_command: envp[%d] = \"%s\"", i, envp[i]);
+      cupsdLogMessage(CUPSD_LOG_DEBUG,
+                      "[CGI] envp[%d] = \"%s\"", i, envp[i]);
   }
 
  /*
@@ -4072,9 +4064,7 @@ pipe_command(cupsd_client_t *con, /* I - Client connection */
 
   if (cupsdOpenPipe(fds))
   {
-    cupsdClearString(&query_string);
-
-    cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to create pipes for CGI %s - %s",
+    cupsdLogMessage(CUPSD_LOG_ERROR, "[CGI] Unable to create pipe for %s - %s",
                     argv[0], strerror(errno));
     return (0);
   }
@@ -4084,13 +4074,13 @@ pipe_command(cupsd_client_t *con,       /* I - Client connection */
   */
 
   if (cupsdStartProcess(command, argv, envp, infile, fds[1], CGIPipes[1],
-                       -1, root, &pid) < 0)
+                       -1, -1, root, DefaultProfile, NULL, &pid) < 0)
   {
    /*
     * Error - can't fork!
     */
 
-    cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to fork for CGI %s - %s", argv[0],
+    cupsdLogMessage(CUPSD_LOG_ERROR, "[CGI] Unable to start %s - %s", argv[0],
                     strerror(errno));
 
     cupsdClosePipe(fds);
@@ -4103,20 +4093,187 @@ pipe_command(cupsd_client_t *con,      /* I - Client connection */
     */
 
     if (con->username[0])
-      cupsdAddCert(pid, con->username);
+      cupsdAddCert(pid, con->username, con->type);
 
-    cupsdLogMessage(CUPSD_LOG_DEBUG, "CGI %s started - PID = %d", command, pid);
+    cupsdLogMessage(CUPSD_LOG_DEBUG, "[CGI] Started %s (PID %d)", command, pid);
 
     *outfile = fds[0];
     close(fds[1]);
   }
 
-  cupsdClearString(&query_string);
-
   return (pid);
 }
 
 
+/*
+ * 'valid_host()' - Is the Host: field valid?
+ */
+
+static int                             /* O - 1 if valid, 0 if not */
+valid_host(cupsd_client_t *con)                /* I - Client connection */
+{
+  cupsd_alias_t        *a;                     /* Current alias */
+  cupsd_netif_t        *netif;                 /* Current network interface */
+  const char   *host,                  /* Host field */
+               *end;                   /* End character */
+
+
+  host = con->http.fields[HTTP_FIELD_HOST];
+
+  if (httpAddrLocalhost(con->http.hostaddr))
+  {
+   /*
+    * Only allow "localhost" or the equivalent IPv4 or IPv6 numerical
+    * addresses when accessing CUPS via the loopback interface...
+    */
+
+    return (!_cups_strcasecmp(host, "localhost") ||
+            !_cups_strncasecmp(host, "localhost:", 10) ||
+           !_cups_strcasecmp(host, "localhost.") ||
+            !_cups_strncasecmp(host, "localhost.:", 11) ||
+#ifdef __linux
+           !_cups_strcasecmp(host, "localhost.localdomain") ||
+            !_cups_strncasecmp(host, "localhost.localdomain:", 22) ||
+#endif /* __linux */
+            !strcmp(host, "127.0.0.1") ||
+           !strncmp(host, "127.0.0.1:", 10) ||
+           !strcmp(host, "[::1]") ||
+           !strncmp(host, "[::1]:", 6));
+  }
+
+#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
+ /*
+  * Check if the hostname is something.local (Bonjour); if so, allow it.
+  */
+
+  if ((end = strrchr(host, '.')) != NULL && end > host &&
+      (!end[1] || end[1] == ':'))
+  {
+   /*
+    * "." on end, work back to second-to-last "."...
+    */
+    for (end --; end > host && *end != '.'; end --);
+  }
+
+  if (end && (!_cups_strcasecmp(end, ".local") ||
+             !_cups_strncasecmp(end, ".local:", 7) ||
+             !_cups_strcasecmp(end, ".local.") ||
+             !_cups_strncasecmp(end, ".local.:", 8)))
+    return (1);
+#endif /* HAVE_DNSSD || HAVE_AVAHI */
+
+ /*
+  * Check if the hostname is an IP address...
+  */
+
+  if (isdigit(*host & 255) || *host == '[')
+  {
+   /*
+    * Possible IPv4/IPv6 address...
+    */
+
+    char       temp[1024],             /* Temporary string */
+               *ptr;                   /* Pointer into temporary string */
+    http_addrlist_t *addrlist;         /* List of addresses */
+
+
+    strlcpy(temp, host, sizeof(temp));
+    if ((ptr = strrchr(temp, ':')) != NULL && !strchr(ptr, ']'))
+      *ptr = '\0';                     /* Strip :port from host value */
+
+    if ((addrlist = httpAddrGetList(temp, AF_UNSPEC, NULL)) != NULL)
+    {
+     /*
+      * Good IPv4/IPv6 address...
+      */
+
+      httpAddrFreeList(addrlist);
+      return (1);
+    }
+  }
+
+ /*
+  * Check for (alias) name matches...
+  */
+
+  for (a = (cupsd_alias_t *)cupsArrayFirst(ServerAlias);
+       a;
+       a = (cupsd_alias_t *)cupsArrayNext(ServerAlias))
+  {
+   /*
+    * "ServerAlias *" allows all host values through...
+    */
+
+    if (!strcmp(a->name, "*"))
+      return (1);
+
+    if (!_cups_strncasecmp(host, a->name, a->namelen))
+    {
+     /*
+      * Prefix matches; check the character at the end - it must be ":", ".",
+      * ".:", or nul...
+      */
+
+      end = host + a->namelen;
+
+      if (!*end || *end == ':' || (*end == '.' && (!end[1] || end[1] == ':')))
+        return (1);
+    }
+  }
+
+#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
+  for (a = (cupsd_alias_t *)cupsArrayFirst(DNSSDAlias);
+       a;
+       a = (cupsd_alias_t *)cupsArrayNext(DNSSDAlias))
+  {
+   /*
+    * "ServerAlias *" allows all host values through...
+    */
+
+    if (!strcmp(a->name, "*"))
+      return (1);
+
+    if (!_cups_strncasecmp(host, a->name, a->namelen))
+    {
+     /*
+      * Prefix matches; check the character at the end - it must be ":", ".",
+      * ".:", or nul...
+      */
+
+      end = host + a->namelen;
+
+      if (!*end || *end == ':' || (*end == '.' && (!end[1] || end[1] == ':')))
+        return (1);
+    }
+  }
+#endif /* HAVE_DNSSD || HAVE_AVAHI */
+
+ /*
+  * Check for interface hostname matches...
+  */
+
+  for (netif = (cupsd_netif_t *)cupsArrayFirst(NetIFList);
+       netif;
+       netif = (cupsd_netif_t *)cupsArrayNext(NetIFList))
+  {
+    if (!_cups_strncasecmp(host, netif->hostname, netif->hostlen))
+    {
+     /*
+      * Prefix matches; check the character at the end - it must be ":", ".",
+      * ".:", or nul...
+      */
+
+      end = host + netif->hostlen;
+
+      if (!*end || *end == ':' || (*end == '.' && (!end[1] || end[1] == ':')))
+        return (1);
+    }
+  }
+
+  return (0);
+}
+
+
 /*
  * 'write_file()' - Send a file via HTTP.
  */
@@ -4130,8 +4287,10 @@ write_file(cupsd_client_t *con,          /* I - Client connection */
 {
   con->file = open(filename, O_RDONLY);
 
-  cupsdLogMessage(CUPSD_LOG_DEBUG, "write_file: %d file=%d", con->http.fd,
-                  con->file);
+  cupsdLogMessage(CUPSD_LOG_DEBUG2,
+                  "[Client %d] write_file code=%d, filename=\"%s\" (%d), "
+                 "type=\"%s\", filestats=%p", con->http.fd,
+                 code, filename, con->file, type ? type : "(null)", filestats);
 
   if (con->file < 0)
     return (0);
@@ -4140,7 +4299,7 @@ write_file(cupsd_client_t *con,           /* I - Client connection */
 
   con->pipe_pid = 0;
 
-  if (!cupsdSendHeader(con, code, type))
+  if (!cupsdSendHeader(con, code, type, CUPSD_AUTH_NONE))
     return (0);
 
   if (httpPrintf(HTTP(con), "Last-Modified: %s\r\n",
@@ -4152,9 +4311,10 @@ write_file(cupsd_client_t *con,          /* I - Client connection */
   if (httpPrintf(HTTP(con), "\r\n") < 0)
     return (0);
 
-  cupsdFlushHeader(con);
+  if (cupsdFlushHeader(con) < 0)
+    return (0);
 
-  con->http.data_encoding  = HTTP_ENCODE_LENGTH;
+  con->http.data_encoding  = HTTP_ENCODING_LENGTH;
   con->http.data_remaining = filestats->st_size;
 
   if (con->http.data_remaining <= INT_MAX)
@@ -4162,15 +4322,31 @@ write_file(cupsd_client_t *con,         /* I - Client connection */
   else
     con->http._data_remaining = INT_MAX;
 
+  cupsdAddSelect(con->http.fd, (cupsd_selfunc_t)cupsdReadClient,
+                 (cupsd_selfunc_t)cupsdWriteClient, con);
+
+  return (1);
+}
+
+
+/*
+ * 'write_pipe()' - Flag that data is available on the CGI pipe.
+ */
+
+static void
+write_pipe(cupsd_client_t *con)                /* I - Client connection */
+{
   cupsdLogMessage(CUPSD_LOG_DEBUG2,
-                  "write_file: Adding fd %d to OutputSet...", con->http.fd);
+                  "[Client %d] write_pipe CGI output on fd %d",
+                  con->http.fd, con->file);
 
-  FD_SET(con->http.fd, OutputSet);
+  con->file_ready = 1;
 
-  return (1);
+  cupsdRemoveSelect(con->file);
+  cupsdAddSelect(con->http.fd, NULL, (cupsd_selfunc_t)cupsdWriteClient, con);
 }
 
 
 /*
- * End of "$Id: client.c 5898 2006-08-28 18:54:10Z mike $".
+ * End of "$Id$".
  */