2 * Copyright (c) 1992, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
6 * Rick Macklem at The University of Guelph.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * $FreeBSD: src/libexec/revnetgroup/parse_netgroup.c,v 1.7 1999/08/28 00:09:48 peter Exp $
37 * $DragonFly: src/libexec/revnetgroup/parse_netgroup.c,v 1.4 2008/11/19 17:46:55 swildner Exp $
41 * This is a specially hacked-up version of getnetgrent.c used to parse
42 * data from the stored hash table of netgroup info rather than from a
43 * file. It's used mainly for the parse_netgroup() function. All the YP
44 * stuff and file support has been stripped out since it isn't needed.
54 * Static Variables and functions used by setnetgrent(), getnetgrent() and
56 * There are two linked lists:
57 * - linelist is just used by setnetgrent() to parse the net group file via.
59 * - netgrp is the list of entries for the current netgroup
62 struct linelist *l_next; /* Chain ptr. */
63 int l_parsed; /* Flag for cycles */
64 char *l_groupname; /* Name of netgroup */
65 char *l_line; /* Netgroup entrie(s) to be parsed */
69 struct netgrp *ng_next; /* Chain ptr */
70 char *ng_str[3]; /* Field pointers, see below */
72 #define NG_HOST 0 /* Host name */
73 #define NG_USER 1 /* User name */
74 #define NG_DOM 2 /* and Domain name */
76 static struct linelist *linehead = NULL;
77 static struct netgrp *nextgrp = NULL;
85 static int parse_netgrp(char *);
86 static struct linelist *read_for_group(char *);
87 extern struct group_entry *gtable[];
91 * Parse the netgroup file looking for the netgroup and build the list
92 * of netgrp structures. Let parse_netgrp() and read_for_group() do
96 __setnetgrent(char *group)
100 if (group == NULL || !strlen(group))
103 if (grouphead.gr == NULL ||
104 strcmp(group, grouphead.grname)) {
106 if (parse_netgrp(group))
109 grouphead.grname = (char *)
110 malloc(strlen(group) + 1);
111 strcpy(grouphead.grname, group);
114 nextgrp = grouphead.gr;
118 * Get the next netgroup off the list.
121 __getnetgrent(char **hostp, char **userp, char **domp)
124 *hostp = nextgrp->ng_str[NG_HOST];
125 *userp = nextgrp->ng_str[NG_USER];
126 *domp = nextgrp->ng_str[NG_DOM];
127 nextgrp = nextgrp->ng_next;
134 * __endnetgrent() - cleanup
139 struct linelist *lp, *olp;
140 struct netgrp *gp, *ogp;
146 free(olp->l_groupname);
151 if (grouphead.grname) {
152 free(grouphead.grname);
153 grouphead.grname = NULL;
159 if (ogp->ng_str[NG_HOST])
160 free(ogp->ng_str[NG_HOST]);
161 if (ogp->ng_str[NG_USER])
162 free(ogp->ng_str[NG_USER]);
163 if (ogp->ng_str[NG_DOM])
164 free(ogp->ng_str[NG_DOM]);
171 * Parse the netgroup file setting up the linked lists.
174 parse_netgrp(char *group)
183 struct linelist *lp = linehead;
186 * First, see if the line has already been read in.
189 if (!strcmp(group, lp->l_groupname))
194 (lp = read_for_group(group)) == NULL)
199 * This error message is largely superfluous since the
200 * code handles the error condition successfully, and
201 * spewing it out from inside libc can actually hose
204 warnx("cycle in netgroup %s", lp->l_groupname);
210 /* Watch for null pointer dereferences, dammit! */
211 while (pos != NULL && *pos != '\0') {
213 grp = (struct netgrp *)malloc(sizeof (struct netgrp));
214 bzero((char *)grp, sizeof (struct netgrp));
215 grp->ng_next = grouphead.gr;
218 gpos = strsep(&pos, ")");
222 for (strpos = 0; strpos < 3; strpos++) {
223 if ((spos = strsep(&gpos, ","))) {
227 while (*spos == ' ' || *spos == '\t')
229 if ((epos = strpbrk(spos, " \t"))) {
235 grp->ng_str[strpos] = (char *)
237 bcopy(spos, grp->ng_str[strpos],
242 * All other systems I've tested
243 * return NULL for empty netgroup
244 * fields. It's up to user programs
245 * to handle the NULLs appropriately.
247 grp->ng_str[strpos] = NULL;
252 * Note: on other platforms, malformed netgroup
253 * entries are not normally flagged. While we
254 * can catch bad entries and report them, we should
255 * stay silent by default for compatibility's sake.
258 warnx("bad entry (%s%s%s%s%s) in netgroup \"%s\"",
259 grp->ng_str[NG_HOST] == NULL ? "" : grp->ng_str[NG_HOST],
260 grp->ng_str[NG_USER] == NULL ? "" : ",",
261 grp->ng_str[NG_USER] == NULL ? "" : grp->ng_str[NG_USER],
262 grp->ng_str[NG_DOM] == NULL ? "" : ",",
263 grp->ng_str[NG_DOM] == NULL ? "" : grp->ng_str[NG_DOM],
267 spos = strsep(&pos, ", \t");
268 if (parse_netgrp(spos))
271 /* Watch for null pointer dereferences, dammit! */
273 while (*pos == ' ' || *pos == ',' || *pos == '\t')
280 * Read the netgroup file and save lines until the line for the netgroup
281 * is found. Return 1 if eof is encountered.
283 static struct linelist *
284 read_for_group(char *group)
286 char *pos, *spos, *linep = NULL, *olinep = NULL;
290 char line[LINSIZ + 1];
293 data = lookup (gtable, group);
294 sprintf(line, "%s %s", group, data);
300 while (*pos == ' ' || *pos == '\t')
303 while (*pos != ' ' && *pos != '\t' && *pos != '\n' &&
307 while (*pos == ' ' || *pos == '\t')
309 if (*pos != '\n' && *pos != '\0') {
310 lp = (struct linelist *)malloc(sizeof (*lp));
312 lp->l_groupname = (char *)malloc(len + 1);
313 bcopy(spos, lp->l_groupname, len);
314 *(lp->l_groupname + len) = '\0';
318 * Loop around handling line continuations.
321 if (*(pos + len - 1) == '\n')
323 if (*(pos + len - 1) == '\\') {
329 linep = (char *)malloc(olen + len + 1);
331 bcopy(olinep, linep, olen);
334 bcopy(pos, linep + olen, len);
336 *(linep + olen) = '\0';
341 if (fgets(line, LINSIZ, netf)) {
350 lp->l_next = linehead;
354 * If this is the one we wanted, we are done.
356 if (!strcmp(lp->l_groupname, group))