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 2 : bool std_pcap_cache_reload(const char *pcap_name, struct pcap_cache **_pcache)
63 : {
64 2 : TALLOC_CTX *frame = talloc_stackframe();
65 : FILE *pcap_file;
66 : char *pcap_line;
67 2 : struct pcap_cache *pcache = NULL;
68 2 : bool print_warning = false;
69 :
70 2 : 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 3 : while ((pcap_line = fgets_slash(frame, NULL, 1024,
77 1 : pcap_file)) != NULL) {
78 0 : char *name = NULL;
79 0 : char *comment = NULL;
80 : 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 : 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 2 : 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 2 : fclose(pcap_file);
154 2 : *_pcache = pcache;
155 2 : talloc_free(frame);
156 2 : return true;
157 : }
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