Line data    Source code

       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 "system/filesys.h"
      59             : #include "printing/pcap.h"
      60             : 
      61             : /* handle standard printcap - moved from pcap_printer_fn() */
      62         120 : bool std_pcap_cache_reload(const char *pcap_name, struct pcap_cache **_pcache)
      63             : {
      64         120 :         TALLOC_CTX *frame = talloc_stackframe();
      65           0 :         FILE *pcap_file;
      66           0 :         char *pcap_line;
      67         120 :         struct pcap_cache *pcache = NULL;
      68         120 :         bool print_warning = false;
      69             : 
      70         120 :         if ((pcap_file = fopen(pcap_name, "r")) == NULL) {
      71           0 :                 DEBUG(0, ("Unable to open printcap file %s for read!\n", pcap_name));
      72           0 :                 talloc_free(frame);
      73           0 :                 return false;
      74             :         }
      75             : 
      76         120 :         while ((pcap_line = fgets_slash(frame, NULL, 1024,
      77         120 :                                         pcap_file)) != NULL) {
      78           0 :                 char *name = NULL;
      79           0 :                 char *comment = NULL;
      80           0 :                 char *p, *q;
      81             : 
      82           0 :                 if (*pcap_line == '#' || *pcap_line == 0) {
      83           0 :                         TALLOC_FREE(pcap_line);
      84           0 :                         continue;
      85             :                 }
      86             : 
      87             :                 /* now we have a real printer line - cut at the first : */
      88           0 :                 if ((p = strchr_m(pcap_line, ':')) != NULL)
      89           0 :                         *p = 0;
      90             : 
      91             :                 /*
      92             :                  * now find the most likely printer name and comment
      93             :                  * this is pure guesswork, but it's better than nothing
      94             :                  */
      95           0 :                 for (p = pcap_line; p != NULL; p = q) {
      96           0 :                         bool has_punctuation = false;
      97             : 
      98           0 :                         if ((q = strchr_m(p, '|')) != NULL)
      99           0 :                                 *q++ = 0;
     100             : 
     101           0 :                         has_punctuation = (strchr_m(p, ' ') ||
     102           0 :                                            strchr_m(p, '\t') ||
     103           0 :                                            strchr_m(p, '"') ||
     104           0 :                                            strchr_m(p, '\'') ||
     105           0 :                                            strchr_m(p, ';') ||
     106           0 :                                            strchr_m(p, ',') ||
     107           0 :                                            strchr_m(p, '(') ||
     108           0 :                                            strchr_m(p, ')'));
     109             : 
     110           0 :                         if (name == NULL && !has_punctuation) {
     111           0 :                                 name = talloc_strdup(frame, p);
     112           0 :                                 TALLOC_FREE(pcap_line);
     113           0 :                                 continue;
     114             :                         }
     115             : 
     116           0 :                         if (has_punctuation) {
     117           0 :                                 comment = talloc_strdup(frame, p);
     118           0 :                                 TALLOC_FREE(pcap_line);
     119           0 :                                 continue;
     120             :                         }
     121             :                 }
     122             : 
     123           0 :                 if (name != NULL) {
     124           0 :                         bool ok;
     125             : 
     126           0 :                         if (!print_warning && strlen(name) > MAXPRINTERLEN) {
     127           0 :                                 print_warning = true;
     128             :                         }
     129             : 
     130           0 :                         ok = pcap_cache_add_specific(&pcache,
     131             :                                                      name,
     132             :                                                      comment,
     133             :                                                      NULL);
     134           0 :                         if (!ok) {
     135           0 :                                 fclose(pcap_file);
     136           0 :                                 pcap_cache_destroy_specific(&pcache);
     137           0 :                                 talloc_free(frame);
     138           0 :                                 return false;
     139             :                         }
     140             :                 }
     141           0 :                 TALLOC_FREE(name);
     142           0 :                 TALLOC_FREE(comment);
     143           0 :                 TALLOC_FREE(pcap_line);
     144             :         }
     145             : 
     146         120 :         if (print_warning) {
     147           0 :                 DBG_WARNING("WARNING: You have some printer names that are "
     148             :                             "longer than %u characters. These may not be "
     149             :                             "accessible to some older clients!\n",
     150             :                             (unsigned int)MAXPRINTERLEN);
     151             :         }
     152             : 
     153         120 :         fclose(pcap_file);
     154         120 :         *_pcache = pcache;
     155         120 :         talloc_free(frame);
     156         120 :         return true;
     157             : }