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
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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
38 static const char rcsid[] =
43 * This is a specially hacked-up version of getnetgrent.c used to parse
44 * data from the stored hash table of netgroup info rather than from a
45 * file. It's used mainly for the parse_netgroup() function. All the YP
46 * stuff and file support has been stripped out since it isn't needed.
57 * Static Variables and functions used by setnetgrent(), getnetgrent() and
59 * There are two linked lists:
60 * - linelist is just used by setnetgrent() to parse the net group file via.
62 * - netgrp is the list of entries for the current netgroup
65 struct linelist *l_next; /* Chain ptr. */
66 int l_parsed; /* Flag for cycles */
67 char *l_groupname; /* Name of netgroup */
68 char *l_line; /* Netgroup entrie(s) to be parsed */
72 struct netgrp *ng_next; /* Chain ptr */
73 char *ng_str[3]; /* Field pointers, see below */
75 #define NG_HOST 0 /* Host name */
76 #define NG_USER 1 /* User name */
77 #define NG_DOM 2 /* and Domain name */
79 static struct linelist *linehead = (struct linelist *)0;
80 static struct netgrp *nextgrp = (struct netgrp *)0;
88 static int parse_netgrp(char *group);
89 static struct linelist *read_for_group(char *group);
90 extern struct group_entry *gtable[];
94 * Parse the netgroup file looking for the netgroup and build the list
95 * of netgrp structures. Let parse_netgrp() and read_for_group() do
99 __setnetgrent(char *group)
103 if (group == NULL || !strlen(group))
106 if (grouphead.gr == (struct netgrp *)0 ||
107 strcmp(group, grouphead.grname)) {
109 if (parse_netgrp(group))
112 grouphead.grname = (char *)
113 malloc(strlen(group) + 1);
114 strcpy(grouphead.grname, group);
117 nextgrp = grouphead.gr;
121 * Get the next netgroup off the list.
124 __getnetgrent(char **hostp, char **userp, char **domp)
127 *hostp = nextgrp->ng_str[NG_HOST];
128 *userp = nextgrp->ng_str[NG_USER];
129 *domp = nextgrp->ng_str[NG_DOM];
130 nextgrp = nextgrp->ng_next;
137 * __endnetgrent() - cleanup
142 struct linelist *lp, *olp;
143 struct netgrp *gp, *ogp;
149 free(olp->l_groupname);
153 linehead = (struct linelist *)0;
154 if (grouphead.grname) {
155 free(grouphead.grname);
156 grouphead.grname = (char *)0;
162 if (ogp->ng_str[NG_HOST])
163 free(ogp->ng_str[NG_HOST]);
164 if (ogp->ng_str[NG_USER])
165 free(ogp->ng_str[NG_USER]);
166 if (ogp->ng_str[NG_DOM])
167 free(ogp->ng_str[NG_DOM]);
170 grouphead.gr = (struct netgrp *)0;
174 * Parse the netgroup file setting up the linked lists.
177 parse_netgrp(char *group)
186 struct linelist *lp = linehead;
189 * First, see if the line has already been read in.
192 if (!strcmp(group, lp->l_groupname))
196 if (lp == (struct linelist *)0 &&
197 (lp = read_for_group(group)) == (struct linelist *)0)
202 * This error message is largely superflous since the
203 * code handles the error condition sucessfully, and
204 * spewing it out from inside libc can actually hose
207 warnx("cycle in netgroup %s", lp->l_groupname);
213 /* Watch for null pointer dereferences, dammit! */
214 while (pos != NULL && *pos != '\0') {
216 grp = (struct netgrp *)malloc(sizeof (struct netgrp));
217 bzero((char *)grp, sizeof (struct netgrp));
218 grp->ng_next = grouphead.gr;
221 gpos = strsep(&pos, ")");
225 for (strpos = 0; strpos < 3; strpos++) {
226 if ((spos = strsep(&gpos, ","))) {
230 while (*spos == ' ' || *spos == '\t')
232 if ((epos = strpbrk(spos, " \t"))) {
238 grp->ng_str[strpos] = (char *)
240 bcopy(spos, grp->ng_str[strpos],
245 * All other systems I've tested
246 * return NULL for empty netgroup
247 * fields. It's up to user programs
248 * to handle the NULLs appropriately.
250 grp->ng_str[strpos] = NULL;
255 * Note: on other platforms, malformed netgroup
256 * entries are not normally flagged. While we
257 * can catch bad entries and report them, we should
258 * stay silent by default for compatibility's sake.
261 warnx("bad entry (%s%s%s%s%s) in netgroup \"%s\"",
262 grp->ng_str[NG_HOST] == NULL ? "" : grp->ng_str[NG_HOST],
263 grp->ng_str[NG_USER] == NULL ? "" : ",",
264 grp->ng_str[NG_USER] == NULL ? "" : grp->ng_str[NG_USER],
265 grp->ng_str[NG_DOM] == NULL ? "" : ",",
266 grp->ng_str[NG_DOM] == NULL ? "" : grp->ng_str[NG_DOM],
270 spos = strsep(&pos, ", \t");
271 if (parse_netgrp(spos))
274 /* Watch for null pointer dereferences, dammit! */
276 while (*pos == ' ' || *pos == ',' || *pos == '\t')
283 * Read the netgroup file and save lines until the line for the netgroup
284 * is found. Return 1 if eof is encountered.
286 static struct linelist *
287 read_for_group(char *group)
289 char *pos, *spos, *linep = NULL, *olinep = NULL;
293 char line[LINSIZ + 1];
296 data = lookup (gtable, group);
297 sprintf(line, "%s %s", group, data);
303 while (*pos == ' ' || *pos == '\t')
306 while (*pos != ' ' && *pos != '\t' && *pos != '\n' &&
310 while (*pos == ' ' || *pos == '\t')
312 if (*pos != '\n' && *pos != '\0') {
313 lp = (struct linelist *)malloc(sizeof (*lp));
315 lp->l_groupname = (char *)malloc(len + 1);
316 bcopy(spos, lp->l_groupname, len);
317 *(lp->l_groupname + len) = '\0';
321 * Loop around handling line continuations.
324 if (*(pos + len - 1) == '\n')
326 if (*(pos + len - 1) == '\\') {
332 linep = (char *)malloc(olen + len + 1);
334 bcopy(olinep, linep, olen);
337 bcopy(pos, linep + olen, len);
339 *(linep + olen) = '\0';
344 if (fgets(line, LINSIZ, netf)) {
353 lp->l_next = linehead;
357 * If this is the one we wanted, we are done.
359 if (!strcmp(lp->l_groupname, group))
363 return ((struct linelist *)0);