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.
56 * Static Variables and functions used by setnetgrent(), getnetgrent() and
58 * There are two linked lists:
59 * - linelist is just used by setnetgrent() to parse the net group file via.
61 * - netgrp is the list of entries for the current netgroup
64 struct linelist *l_next; /* Chain ptr. */
65 int l_parsed; /* Flag for cycles */
66 char *l_groupname; /* Name of netgroup */
67 char *l_line; /* Netgroup entrie(s) to be parsed */
71 struct netgrp *ng_next; /* Chain ptr */
72 char *ng_str[3]; /* Field pointers, see below */
74 #define NG_HOST 0 /* Host name */
75 #define NG_USER 1 /* User name */
76 #define NG_DOM 2 /* and Domain name */
78 static struct linelist *linehead = (struct linelist *)0;
79 static struct netgrp *nextgrp = (struct netgrp *)0;
87 static int parse_netgrp(char *group);
88 static struct linelist *read_for_group(char *group);
89 extern struct group_entry *gtable[];
93 * Parse the netgroup file looking for the netgroup and build the list
94 * of netgrp structures. Let parse_netgrp() and read_for_group() do
98 __setnetgrent(char *group)
102 if (group == NULL || !strlen(group))
105 if (grouphead.gr == (struct netgrp *)0 ||
106 strcmp(group, grouphead.grname)) {
108 if (parse_netgrp(group))
111 grouphead.grname = (char *)
112 malloc(strlen(group) + 1);
113 strcpy(grouphead.grname, group);
116 nextgrp = grouphead.gr;
120 * Get the next netgroup off the list.
123 __getnetgrent(char **hostp, char **userp, char **domp)
126 *hostp = nextgrp->ng_str[NG_HOST];
127 *userp = nextgrp->ng_str[NG_USER];
128 *domp = nextgrp->ng_str[NG_DOM];
129 nextgrp = nextgrp->ng_next;
136 * __endnetgrent() - cleanup
141 struct linelist *lp, *olp;
142 struct netgrp *gp, *ogp;
148 free(olp->l_groupname);
152 linehead = (struct linelist *)0;
153 if (grouphead.grname) {
154 free(grouphead.grname);
155 grouphead.grname = (char *)0;
161 if (ogp->ng_str[NG_HOST])
162 free(ogp->ng_str[NG_HOST]);
163 if (ogp->ng_str[NG_USER])
164 free(ogp->ng_str[NG_USER]);
165 if (ogp->ng_str[NG_DOM])
166 free(ogp->ng_str[NG_DOM]);
169 grouphead.gr = (struct netgrp *)0;
173 * Parse the netgroup file setting up the linked lists.
176 parse_netgrp(char *group)
185 struct linelist *lp = linehead;
188 * First, see if the line has already been read in.
191 if (!strcmp(group, lp->l_groupname))
195 if (lp == (struct linelist *)0 &&
196 (lp = read_for_group(group)) == (struct linelist *)0)
201 * This error message is largely superflous since the
202 * code handles the error condition sucessfully, and
203 * spewing it out from inside libc can actually hose
206 warnx("cycle in netgroup %s", lp->l_groupname);
212 /* Watch for null pointer dereferences, dammit! */
213 while (pos != NULL && *pos != '\0') {
215 grp = (struct netgrp *)malloc(sizeof (struct netgrp));
216 bzero((char *)grp, sizeof (struct netgrp));
217 grp->ng_next = grouphead.gr;
220 gpos = strsep(&pos, ")");
224 for (strpos = 0; strpos < 3; strpos++) {
225 if ((spos = strsep(&gpos, ","))) {
229 while (*spos == ' ' || *spos == '\t')
231 if ((epos = strpbrk(spos, " \t"))) {
237 grp->ng_str[strpos] = (char *)
239 bcopy(spos, grp->ng_str[strpos],
244 * All other systems I've tested
245 * return NULL for empty netgroup
246 * fields. It's up to user programs
247 * to handle the NULLs appropriately.
249 grp->ng_str[strpos] = NULL;
254 * Note: on other platforms, malformed netgroup
255 * entries are not normally flagged. While we
256 * can catch bad entries and report them, we should
257 * stay silent by default for compatibility's sake.
260 warnx("bad entry (%s%s%s%s%s) in netgroup \"%s\"",
261 grp->ng_str[NG_HOST] == NULL ? "" : grp->ng_str[NG_HOST],
262 grp->ng_str[NG_USER] == NULL ? "" : ",",
263 grp->ng_str[NG_USER] == NULL ? "" : grp->ng_str[NG_USER],
264 grp->ng_str[NG_DOM] == NULL ? "" : ",",
265 grp->ng_str[NG_DOM] == NULL ? "" : grp->ng_str[NG_DOM],
269 spos = strsep(&pos, ", \t");
270 if (parse_netgrp(spos))
273 /* Watch for null pointer dereferences, dammit! */
275 while (*pos == ' ' || *pos == ',' || *pos == '\t')
282 * Read the netgroup file and save lines until the line for the netgroup
283 * is found. Return 1 if eof is encountered.
285 static struct linelist *
286 read_for_group(char *group)
288 char *pos, *spos, *linep = NULL, *olinep = NULL;
292 char line[LINSIZ + 1];
295 data = lookup (gtable, group);
296 sprintf(line, "%s %s", group, data);
302 while (*pos == ' ' || *pos == '\t')
305 while (*pos != ' ' && *pos != '\t' && *pos != '\n' &&
309 while (*pos == ' ' || *pos == '\t')
311 if (*pos != '\n' && *pos != '\0') {
312 lp = (struct linelist *)malloc(sizeof (*lp));
314 lp->l_groupname = (char *)malloc(len + 1);
315 bcopy(spos, lp->l_groupname, len);
316 *(lp->l_groupname + len) = '\0';
320 * Loop around handling line continuations.
323 if (*(pos + len - 1) == '\n')
325 if (*(pos + len - 1) == '\\') {
331 linep = (char *)malloc(olen + len + 1);
333 bcopy(olinep, linep, olen);
336 bcopy(pos, linep + olen, len);
338 *(linep + olen) = '\0';
343 if (fgets(line, LINSIZ, netf)) {
352 lp->l_next = linehead;
356 * If this is the one we wanted, we are done.
358 if (!strcmp(lp->l_groupname, group))
362 return ((struct linelist *)0);