source/printing/print_cups.c

   1 /*
   2  * Support code for the Common UNIX Printing System ("CUPS")
   3  *
   4  * Copyright 1999 by Easy Software Products
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #include "includes.h"
  22 #include "smb.h"
  23
  24 #ifdef HAVE_LIBCUPS
  25 #include <cups/cups.h>
  26 #include <cups/language.h>
  27
  28 extern int DEBUGLEVEL;
  29
  30
  31 /*
  32  * 'cups_printer_fn()' - Call a function for every printer known to the
  33  *                       system.
  34  */
  35
  36 void cups_printer_fn(void (*fn)(char *, char *))
  37 {
  38         http_t          *http;          /* HTTP connection to server */
  39         ipp_t           *request,       /* IPP Request */
  40                         *response;      /* IPP Response */
  41         ipp_attribute_t *attr;          /* Current attribute */
  42         cups_lang_t     *language;      /* Default language */
  43         char            *name,          /* printer-name attribute */
  44                         *make_model;    /* make_model attribute */
  45
  46
  47        /*
  48         * Try to connect to the server...
  49         */
  50
  51         if ((http = httpConnect(cupsServer(), ippPort())) == NULL)
  52                 return;
  53
  54        /*
  55         * Build a CUPS_GET_PRINTERS request, which requires the following
  56         * attributes:
  57         *
  58         *    attributes-charset
  59         *    attributes-natural-language
  60         */
  61
  62         request = ippNew();
  63
  64         request->request.op.operation_id = CUPS_GET_PRINTERS;
  65         request->request.op.request_id   = 1;
  66
  67         language = cupsLangDefault();
  68
  69         ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_CHARSET,
  70                      "attributes-charset", NULL, cupsLangEncoding(language));
  71
  72         ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_LANGUAGE,
  73                      "attributes-natural-language", NULL, language->language);
  74
  75        /*
  76         * Do the request and get back a response...
  77         */
  78
  79         if ((response = cupsDoRequest(http, request, "/")) == NULL)
  80         {
  81                 httpClose(http);
  82                 return;
  83         }
  84
  85         for (attr = response->attrs; attr != NULL;)
  86         {
  87                /*
  88                 * Skip leading attributes until we hit a printer...
  89                 */
  90
  91                 while (attr != NULL && attr->group_tag != IPP_TAG_PRINTER)
  92                         attr = attr->next;
  93
  94                 if (attr == NULL)
  95                         break;
  96
  97                /*
  98                 * Pull the needed attributes from this printer...
  99                 */
 100
 101                 name       = NULL;
 102                 make_model = NULL;
 103
 104                 while (attr != NULL && attr->group_tag == IPP_TAG_PRINTER)
 105                 {
 106                         if (strcmp(attr->name, "printer-name") == 0 &&
 107                             attr->value_tag == IPP_TAG_NAME)
 108                                 name = attr->values[0].string.text;
 109
 110                         if (strcmp(attr->name, "printer-make-and-model") == 0 &&
 111                             attr->value_tag == IPP_TAG_TEXT)
 112                                 make_model = attr->values[0].string.text;
 113
 114                         attr = attr->next;
 115                 }
 116
 117                /*
 118                 * See if we have everything needed...
 119                 */
 120
 121                 if (name == NULL)
 122                         break;
 123
 124                 (*fn)(name, make_model);
 125         }
 126
 127         ippDelete(response);
 128         httpClose(http);
 129 }
 130
 131
 132 /*
 133  * provide the equivalent of pcap_printername_ok() for SVID/XPG4 conforming
 134  * systems.
 135  */
 136 int cups_printername_ok(char *name)
 137 {
 138         http_t          *http;          /* HTTP connection to server */
 139         ipp_t           *request,       /* IPP Request */
 140                         *response;      /* IPP Response */
 141         ipp_attribute_t *attr;          /* Current attribute */
 142         cups_lang_t     *language;      /* Default language */
 143         char            uri[HTTP_MAX_URI]; /* printer-uri attribute */
 144
 145        /*
 146         * Try to connect to the server...
 147         */
 148
 149         if ((http = httpConnect(cupsServer(), ippPort())) == NULL)
 150                 return (0);
 151
 152        /*
 153         * Build a IPP_GET_PRINTER_ATTRS request, which requires the following
 154         * attributes:
 155         *
 156         *    attributes-charset
 157         *    attributes-natural-language
 158         *    printer-uri
 159         */
 160
 161         request = ippNew();
 162
 163         request->request.op.operation_id = IPP_GET_PRINTER_ATTRIBUTES;
 164         request->request.op.request_id   = 1;
 165
 166         language = cupsLangDefault();
 167
 168         ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_CHARSET,
 169                      "attributes-charset", NULL, cupsLangEncoding(language));
 170
 171         ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_LANGUAGE,
 172                      "attributes-natural-language", NULL, language->language);
 173
 174         snprintf(uri, sizeof(uri), "ipp://localhost/printers/%s", name);
 175
 176         ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_URI,
 177                      "printer-uri", NULL, uri);
 178
 179        /*
 180         * Do the request and get back a response...
 181         */
 182
 183         if ((response = cupsDoRequest(http, request, "/")) == NULL)
 184         {
 185                 httpClose(http);
 186                 return (0);
 187         }
 188
 189         httpClose(http);
 190
 191         if (response->request.status.status_code >= IPP_OK_CONFLICT)
 192         {
 193                 ippDelete(response);
 194                 return (0);
 195         }
 196         else
 197         {
 198                 ippDelete(response);
 199                 return (1);
 200         }
 201 }
 202
 203 #else
 204  /* this keeps fussy compilers happy */
 205  void print_cups_dummy(void) {}
 206 #endif /* HAVE_LIBCUPS */