source3/printing/print_standard.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    printcap parsing
   4    Copyright (C) Karl Auer 1993-1998
   5
   6    Re-working by Martin Kiff, 1994
   7
   8    Re-written again by Andrew Tridgell
   9
  10    Modified for SVID support by Norm Jacobs, 1997
  11
  12    Modified for CUPS support by Michael Sweet, 1999
  13
  14    This program is free software; you can redistribute it and/or modify
  15    it under the terms of the GNU General Public License as published by
  16    the Free Software Foundation; either version 3 of the License, or
  17    (at your option) any later version.
  18
  19    This program is distributed in the hope that it will be useful,
  20    but WITHOUT ANY WARRANTY; without even the implied warranty of
  21    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22    GNU General Public License for more details.
  23
  24    You should have received a copy of the GNU General Public License
  25    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  26 */
  27
  28 /*
  29  *  This module contains code to parse and cache printcap data, possibly
  30  *  in concert with the CUPS/SYSV/AIX-specific code found elsewhere.
  31  *
  32  *  The way this module looks at the printcap file is very simplistic.
  33  *  Only the local printcap file is inspected (no searching of NIS
  34  *  databases etc).
  35  *
  36  *  There are assumed to be one or more printer names per record, held
  37  *  as a set of sub-fields separated by vertical bar symbols ('|') in the
  38  *  first field of the record. The field separator is assumed to be a colon
  39  *  ':' and the record separator a newline.
  40  *
  41  *  Lines ending with a backspace '\' are assumed to flag that the following
  42  *  line is a continuation line so that a set of lines can be read as one
  43  *  printcap entry.
  44  *
  45  *  A line stating with a hash '#' is assumed to be a comment and is ignored
  46  *  Comments are discarded before the record is strung together from the
  47  *  set of continuation lines.
  48  *
  49  *  Opening a pipe for "lpc status" and reading that would probably
  50  *  be pretty effective. Code to do this already exists in the freely
  51  *  distributable PCNFS server code.
  52  */
  53
  54 /* printcap parsing specific code moved here from printing/pcap.c */
  55
  56
  57 #include "includes.h"
  58 #include "lib/util/util_file.h"
  59 #include "system/filesys.h"
  60 #include "printing/pcap.h"
  61
  62 /* handle standard printcap - moved from pcap_printer_fn() */
  63 bool std_pcap_cache_reload(const char *pcap_name, struct pcap_cache **_pcache)
  64 {
  65         TALLOC_CTX *frame = talloc_stackframe();
  66         FILE *pcap_file;
  67         char *pcap_line;
  68         struct pcap_cache *pcache = NULL;
  69         bool print_warning = false;
  70
  71         if ((pcap_file = fopen(pcap_name, "r")) == NULL) {
  72                 DEBUG(0, ("Unable to open printcap file %s for read!\n", pcap_name));
  73                 talloc_free(frame);
  74                 return false;
  75         }
  76
  77         while ((pcap_line = fgets_slash(frame, NULL, 1024,
  78                                         pcap_file)) != NULL) {
  79                 char *name = NULL;
  80                 char *comment = NULL;
  81                 char *p, *q;
  82
  83                 if (*pcap_line == '#' || *pcap_line == 0) {
  84                         TALLOC_FREE(pcap_line);
  85                         continue;
  86                 }
  87
  88                 /* now we have a real printer line - cut at the first : */
  89                 if ((p = strchr_m(pcap_line, ':')) != NULL)
  90                         *p = 0;
  91
  92                 /*
  93                  * now find the most likely printer name and comment
  94                  * this is pure guesswork, but it's better than nothing
  95                  */
  96                 for (p = pcap_line; p != NULL; p = q) {
  97                         bool has_punctuation = false;
  98
  99                         if ((q = strchr_m(p, '|')) != NULL)
 100                                 *q++ = 0;
 101
 102                         has_punctuation = (strchr_m(p, ' ') ||
 103                                            strchr_m(p, '\t') ||
 104                                            strchr_m(p, '"') ||
 105                                            strchr_m(p, '\'') ||
 106                                            strchr_m(p, ';') ||
 107                                            strchr_m(p, ',') ||
 108                                            strchr_m(p, '(') ||
 109                                            strchr_m(p, ')'));
 110
 111                         if (name == NULL && !has_punctuation) {
 112                                 name = talloc_strdup(frame, p);
 113                                 TALLOC_FREE(pcap_line);
 114                                 continue;
 115                         }
 116
 117                         if (has_punctuation) {
 118                                 comment = talloc_strdup(frame, p);
 119                                 TALLOC_FREE(pcap_line);
 120                                 continue;
 121                         }
 122                 }
 123
 124                 if (name != NULL) {
 125                         bool ok;
 126
 127                         if (!print_warning && strlen(name) > MAXPRINTERLEN) {
 128                                 print_warning = true;
 129                         }
 130
 131                         ok = pcap_cache_add_specific(&pcache,
 132                                                      name,
 133                                                      comment,
 134                                                      NULL);
 135                         if (!ok) {
 136                                 fclose(pcap_file);
 137                                 pcap_cache_destroy_specific(&pcache);
 138                                 talloc_free(frame);
 139                                 return false;
 140                         }
 141                 }
 142                 TALLOC_FREE(name);
 143                 TALLOC_FREE(comment);
 144                 TALLOC_FREE(pcap_line);
 145         }
 146
 147         if (print_warning) {
 148                 DBG_WARNING("WARNING: You have some printer names that are "
 149                             "longer than %u characters. These may not be "
 150                             "accessible to some older clients!\n",
 151                             (unsigned int)MAXPRINTERLEN);
 152         }
 153
 154         fclose(pcap_file);
 155         *_pcache = pcache;
 156         talloc_free(frame);
 157         return true;
 158 }