[gnome-control-center] Printers: Use SNMP CUPS backend to discover printers on given address

[Marek Kašík <mkasik src gnome org>]

commit fba02faa49881bd369a81f62ae5a64f5af2e4ea6
Author: Marek Kasik <mkasik redhat com>
Date:   Fri May 27 15:38:59 2011 +0200

    Printers: Use SNMP CUPS backend to discover printers on given address
    
    Search for printers on address given by user using CUPS's SNMP backend.
    This modification typically finds network printers publishing themselves
    on port 9100.

 panels/printers/pp-new-printer-dialog.c |  170 +++++++++++++++++++++++++++++--
 1 files changed, 162 insertions(+), 8 deletions(-)
---
diff --git a/panels/printers/pp-new-printer-dialog.c b/panels/printers/pp-new-printer-dialog.c
index 2986bd3..a6164fa 100644
--- a/panels/printers/pp-new-printer-dialog.c
+++ b/panels/printers/pp-new-printer-dialog.c
@@ -513,6 +513,90 @@ devices_get (PpNewPrinterDialog *pp)
     }
 }
 
+static gchar **
+line_split (gchar *line)
+{
+  gboolean   escaped = FALSE;
+  gboolean   quoted = FALSE;
+  gboolean   in_word = FALSE;
+  gchar    **words = NULL;
+  gchar    **result = NULL;
+  gchar     *buffer = NULL;
+  gchar      ch;
+  gint       n = 0;
+  gint       i, j = 0, k = 0;
+
+  if (line)
+    {
+      n = strlen (line);
+      words = g_new0 (gchar *, n + 1);
+      buffer = g_new0 (gchar, n + 1);
+
+      for (i = 0; i < n; i++)
+        {
+          ch = line[i];
+
+          if (escaped)
+            {
+              buffer[k++] = ch;
+              escaped = FALSE;
+              continue;
+            }
+
+          if (ch == '\\')
+            {
+              in_word = TRUE;
+              escaped = TRUE;
+              continue;
+            }
+
+          if (in_word)
+            {
+              if (quoted)
+                {
+                  if (ch == '"')
+                    quoted = FALSE;
+                  else
+                    buffer[k++] = ch;
+                }
+              else if (g_ascii_isspace (ch))
+                {
+                  words[j++] = g_strdup (buffer);
+                  memset (buffer, 0, n + 1);
+                  k = 0;
+                  in_word = FALSE;
+                }
+              else if (ch == '"')
+                quoted = TRUE;
+              else
+                buffer[k++] = ch;
+            }
+          else
+            {
+              if (ch == '"')
+                {
+                  in_word = TRUE;
+                  quoted = TRUE;
+                }
+              else if (!g_ascii_isspace (ch))
+                {
+                  in_word = TRUE;
+                  buffer[k++] = ch;
+                }
+            }
+        }
+    }
+
+  if (buffer[0] != '\0')
+    words[j++] = g_strdup (buffer);
+
+  result = g_strdupv (words);
+  g_strfreev (words);
+  g_free (buffer);
+
+  return result;
+}
+
 static void
 search_address_cb (GtkToggleButton *togglebutton,
                    gpointer         user_data)
@@ -534,14 +618,19 @@ search_address_cb (GtkToggleButton *togglebutton,
 
       if (uri && uri[0] != '\0')
         {
-          http_t *http;
           cups_dest_t *dests = NULL;
-          gint num_dests = 0;
-          gchar *tmp = NULL;
-          gchar *host = NULL;
-          gchar *port_string = NULL;
-          int  port = 631;
-          gchar *position;
+          http_t      *http;
+          GError      *error = NULL;
+          gchar       *tmp = NULL;
+          gchar       *host = NULL;
+          gchar       *port_string = NULL;
+          gchar       *position;
+          gchar       *command;
+          gchar       *standard_output = NULL;
+          gint         exit_status = -1;
+          gint         num_dests = 0;
+          gint         length;
+          int          port = 631;
 
           if (g_strrstr (uri, "://"))
             tmp = g_strrstr (uri, "://") + 3;
@@ -569,9 +658,9 @@ search_address_cb (GtkToggleButton *togglebutton,
           if (port_string)
             port = atoi (port_string);
 
-          /* Search for CUPS server */
           if (host)
             {
+              /* Use CUPS to get printer's informations */
               http = httpConnectEncrypt (host, port, cupsEncryption ());
               if (http)
                 {
@@ -622,6 +711,71 @@ search_address_cb (GtkToggleButton *togglebutton,
 
                   httpClose (http);
                 }
+
+              /* Use SNMP to get printer's informations */
+              command = g_strdup_printf ("/usr/lib/cups/backend/snmp %s", host);
+              if (g_spawn_command_line_sync (command, &standard_output, NULL, &exit_status, &error))
+                {
+                  if (exit_status == 0 && standard_output)
+                    {
+                      gchar **printer_informations = NULL;
+
+                      printer_informations = line_split (standard_output);
+                      length = g_strv_length (printer_informations);
+
+                      if (length >= 4)
+                        {
+                          CupsDevice *devices = NULL;
+                          devices = g_new0 (CupsDevice, pp->num_devices + 1);
+
+                          for (i = 0; i < pp->num_devices; i++)
+                            {
+                              devices[i] = pp->devices[i];
+                              pp->devices[i].device_class = NULL;
+                              pp->devices[i].device_id = NULL;
+                              pp->devices[i].device_info = NULL;
+                              pp->devices[i].device_make_and_model = NULL;
+                              pp->devices[i].device_uri = NULL;
+                              pp->devices[i].device_location = NULL;
+                              pp->devices[i].device_ppd_uri = NULL;
+                              pp->devices[i].display_name = NULL;
+                              pp->devices[i].hostname = NULL;
+                            }
+
+                          g_free (pp->devices);
+                          pp->devices = devices;
+
+                          pp->devices[pp->num_devices].device_class = g_strdup (printer_informations[0]);
+                          pp->devices[pp->num_devices].device_uri = g_strdup (printer_informations[1]);
+                          pp->devices[pp->num_devices].device_make_and_model = g_strdup (printer_informations[2]);
+                          pp->devices[pp->num_devices].device_info = g_strdup (printer_informations[3]);
+                          pp->devices[pp->num_devices].display_name = g_strdup (printer_informations[3]);
+                          pp->devices[pp->num_devices].display_name =
+                            g_strcanon (pp->devices[pp->num_devices].display_name, ALLOWED_CHARACTERS, '-');
+                          pp->devices[pp->num_devices].show = TRUE;
+                          pp->devices[pp->num_devices].hostname = g_strdup (host);
+                          pp->devices[pp->num_devices].host_port = port;
+                          pp->devices[pp->num_devices].found = TRUE;
+
+                          if (length >= 5 && printer_informations[4][0] != '\0')
+                            pp->devices[pp->num_devices].device_id = g_strdup (printer_informations[4]);
+
+                          if (length >= 6 && printer_informations[5][0] != '\0')
+                            pp->devices[pp->num_devices].device_location = g_strdup (printer_informations[5]);
+
+                          pp->num_devices++;
+                        }
+                      g_strfreev (printer_informations);
+                      g_free (standard_output);
+                    }
+                }
+              else
+                {
+                  if (error)
+                    g_warning ("%s", error->message);
+                }
+
+              g_free (command);
               g_free (host);
             }
         }