Merge from vendor branch BZIP:
[dragonfly.git] / lib / libc / gen / getgrent.c
CommitLineData
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1/* $NetBSD: getgrent.c,v 1.34.2.1 1999/04/27 14:10:58 perry Exp $ */
2/*
3 * Copyright (c) 1989, 1993
4 * The Regents of the University of California. All rights reserved.
5 * Portions Copyright (c) 1994, Jason Downs. All Rights Reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by the University of
18 * California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
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34 *
35 * @(#)getgrent.c 8.2 (Berkeley) 3/21/94
36 * $FreeBSD: src/lib/libc/gen/getgrent.c,v 1.17.6.1 2001/03/05 08:56:02 obrien Exp $
b0e25abd 37 * $DragonFly: src/lib/libc/gen/getgrent.c,v 1.5 2005/11/19 22:32:53 swildner Exp $
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38 */
39
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40#include <errno.h>
41#include <limits.h>
42#include <sys/types.h>
43#include <stdio.h>
44#include <stdlib.h>
45#include <string.h>
46#include <grp.h>
47#include <syslog.h>
48
49static FILE *_gr_fp;
50static struct group _gr_group;
51static int _gr_stayopen;
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52
53static int grscan(int, gid_t, const char *);
54static int start_gr(void);
55
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56#ifdef YP
57#include <rpc/rpc.h>
58#include <rpcsvc/yp_prot.h>
59#include <rpcsvc/ypclnt.h>
60static int _gr_stepping_yp;
61static int _gr_yp_enabled;
76f89ad8 62static int _getypgroup(struct group *, const char *, const char *);
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63static int _nextypgroup(struct group *);
64#endif
65
66/* initial size for malloc and increase steps for realloc */
67#define MAXGRP 64
68#define MAXLINELENGTH 256
69
70static char **members; /* list of group members */
71static int maxgrp; /* current length of **mebers */
72static char *line; /* temp buffer for group line */
73static int maxlinelength; /* current length of *line */
74
75/*
76 * Lines longer than MAXLINELENGTHLIMIT will be counted as an error.
77 * <= 0 disable check for maximum line length
78 * 256K is enough for 64,000 uids
79 */
80#define MAXLINELENGTHLIMIT (256 * 1024)
81#define GROUP_IGNORE_COMMENTS 1 /* allow comments in /etc/group */
82
83struct group *
76f89ad8 84getgrent(void)
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85{
86 if (!_gr_fp && !start_gr()) {
87 return NULL;
88 }
89
90#ifdef YP
91 if (_gr_stepping_yp) {
92 if (_nextypgroup(&_gr_group))
93 return(&_gr_group);
94 }
95tryagain:
96#endif
97
98 if (!grscan(0, 0, NULL))
99 return(NULL);
100#ifdef YP
101 if(_gr_group.gr_name[0] == '+' && _gr_group.gr_name[1]) {
102 _getypgroup(&_gr_group, &_gr_group.gr_name[1],
103 "group.byname");
104 } else if(_gr_group.gr_name[0] == '+') {
105 if (!_nextypgroup(&_gr_group))
106 goto tryagain;
107 else
108 return(&_gr_group);
109 }
110#endif
111 return(&_gr_group);
112}
113
114struct group *
76f89ad8 115getgrnam(const char *name)
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116{
117 int rval;
118
119 if (!start_gr())
120 return(NULL);
121#ifdef YP
122 tryagain:
123#endif
124 rval = grscan(1, 0, name);
125#ifdef YP
126 if(rval == -1 && (_gr_yp_enabled < 0 || (_gr_yp_enabled &&
127 _gr_group.gr_name[0] == '+'))) {
128 if (!(rval = _getypgroup(&_gr_group, name, "group.byname")))
129 goto tryagain;
130 }
131#endif
132 if (!_gr_stayopen)
133 endgrent();
134 return (rval) ? &_gr_group : NULL;
135}
136
137struct group *
76f89ad8 138getgrgid(gid_t gid)
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139{
140 int rval;
141
142 if (!start_gr())
143 return(NULL);
144#ifdef YP
145 tryagain:
146#endif
147 rval = grscan(1, gid, NULL);
148#ifdef YP
149 if(rval == -1 && _gr_yp_enabled) {
150 char buf[16];
151 snprintf(buf, sizeof buf, "%d", (unsigned)gid);
152 if (!(rval = _getypgroup(&_gr_group, buf, "group.bygid")))
153 goto tryagain;
154 }
155#endif
156 if (!_gr_stayopen)
157 endgrent();
158 return (rval) ? &_gr_group : NULL;
159}
160
161static int
76f89ad8 162start_gr(void)
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163{
164 if (_gr_fp) {
165 rewind(_gr_fp);
166 return(1);
167 }
168 _gr_fp = fopen(_PATH_GROUP, "r");
169 if(!_gr_fp) return 0;
170#ifdef YP
171 /*
172 * This is a disgusting hack, used to determine when YP is enabled.
173 * This would be easier if we had a group database to go along with
174 * the password database.
175 */
176 {
76f89ad8 177 char *my_line;
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178 size_t linelen;
179 _gr_yp_enabled = 0;
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180 while((my_line = fgetln(_gr_fp, &linelen)) != NULL) {
181 if(my_line[0] == '+') {
182 if(my_line[1] && my_line[1] != ':' && !_gr_yp_enabled) {
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183 _gr_yp_enabled = 1;
184 } else {
185 _gr_yp_enabled = -1;
186 break;
187 }
188 }
189 }
190 rewind(_gr_fp);
191 }
192#endif
193
194 if (maxlinelength == 0) {
195 if ((line = (char *)malloc(MAXLINELENGTH)) == NULL)
196 return 0;
197 maxlinelength += MAXLINELENGTH;
198 }
199
200 if (maxgrp == 0) {
201 if ((members = (char **) malloc(sizeof(char **) *
202 MAXGRP)) == NULL)
203 return 0;
204 maxgrp += MAXGRP;
205 }
206
207 return 1;
208}
209
210int
211setgrent(void)
212{
213 return setgroupent(0);
214}
215
216int
76f89ad8 217setgroupent(int stayopen)
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218{
219 if (!start_gr())
220 return 0;
221 _gr_stayopen = stayopen;
222#ifdef YP
223 _gr_stepping_yp = 0;
224#endif
225 return 1;
226}
227
228void
76f89ad8 229endgrent(void)
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230{
231#ifdef YP
232 _gr_stepping_yp = 0;
233#endif
234 if (_gr_fp) {
235 (void)fclose(_gr_fp);
236 _gr_fp = NULL;
237 }
238}
239
240static int
76f89ad8 241grscan(int search, gid_t gid, const char *name)
984263bc 242{
e27dad4e 243 char *cp, **m;
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244 char *bp;
245
246
247#ifdef YP
248 int _ypfound;
249#endif
250 for (;;) {
251#ifdef YP
252 _ypfound = 0;
253#endif
254 if (fgets(line, maxlinelength, _gr_fp) == NULL)
255 return(0);
256
257 if (!index(line, '\n')) {
258 do {
259 if (feof(_gr_fp))
260 return(0);
261
262 /* don't allocate infinite memory */
263 if (MAXLINELENGTHLIMIT > 0 &&
264 maxlinelength >= MAXLINELENGTHLIMIT)
265 return(0);
266
76f89ad8 267 if ((line = reallocf(line,
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268 (maxlinelength + MAXLINELENGTH))) == NULL)
269 return(0);
270
271 if (fgets(line + maxlinelength - 1,
272 MAXLINELENGTH + 1, _gr_fp) == NULL)
273 return(0);
274
275 maxlinelength += MAXLINELENGTH;
276 } while (!index(line + maxlinelength -
277 MAXLINELENGTH - 1, '\n'));
278 }
279
280#ifdef GROUP_IGNORE_COMMENTS
281 /*
282 * Ignore comments: ^[ \t]*#
283 */
284 for (cp = line; *cp != '\0'; cp++)
285 if (*cp != ' ' && *cp != '\t')
286 break;
287 if (*cp == '#' || *cp == '\0')
288 continue;
289#endif
290
291 bp = line;
292
293 if ((_gr_group.gr_name = strsep(&bp, ":\n")) == NULL)
294 break;
295#ifdef YP
296 /*
297 * XXX We need to be careful to avoid proceeding
298 * past this point under certain circumstances or
299 * we risk dereferencing null pointers down below.
300 */
301 if (_gr_group.gr_name[0] == '+') {
302 if (strlen(_gr_group.gr_name) == 1) {
303 switch(search) {
304 case 0:
305 return(1);
306 case 1:
307 return(-1);
308 default:
309 return(0);
310 }
311 } else {
312 cp = &_gr_group.gr_name[1];
313 if (search && name != NULL)
314 if (strcmp(cp, name))
315 continue;
316 if (!_getypgroup(&_gr_group, cp,
317 "group.byname"))
318 continue;
319 if (search && name == NULL)
320 if (gid != _gr_group.gr_gid)
321 continue;
322 /* We're going to override -- tell the world. */
323 _ypfound++;
324 }
325 }
326#else
327 if (_gr_group.gr_name[0] == '+')
328 continue;
329#endif /* YP */
330 if (search && name) {
331 if(strcmp(_gr_group.gr_name, name)) {
332 continue;
333 }
334 }
335#ifdef YP
76f89ad8 336 if ((cp = strsep(&bp, ":\n")) == NULL) {
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337 if (_ypfound)
338 return(1);
339 else
340 break;
76f89ad8 341 }
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342 if (strlen(cp) || !_ypfound)
343 _gr_group.gr_passwd = cp;
344#else
345 if ((_gr_group.gr_passwd = strsep(&bp, ":\n")) == NULL)
346 break;
347#endif
76f89ad8 348 if (!(cp = strsep(&bp, ":\n"))) {
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349#ifdef YP
350 if (_ypfound)
351 return(1);
352 else
353#endif
354 continue;
76f89ad8 355 }
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356#ifdef YP
357 /*
358 * Hurm. Should we be doing this? We allow UIDs to
359 * be overridden -- what about GIDs?
360 */
361 if (!_ypfound)
362#endif
363 _gr_group.gr_gid = atoi(cp);
364 if (search && name == NULL && _gr_group.gr_gid != gid)
365 continue;
366 cp = NULL;
367 if (bp == NULL) /* !!! Must check for this! */
368 break;
369#ifdef YP
370 if ((cp = strsep(&bp, ":\n")) == NULL)
371 break;
372
373 if (!strlen(cp) && _ypfound)
374 return(1);
375 else
376 members[0] = NULL;
377 bp = cp;
378 cp = NULL;
379#endif
380 for (m = members; ; bp++) {
381 if (m == (members + maxgrp - 1)) {
382 if ((members = (char **)
383 reallocf(members,
384 sizeof(char **) *
385 (maxgrp + MAXGRP))) == NULL)
386 return(0);
387 m = members + maxgrp - 1;
388 maxgrp += MAXGRP;
389 }
390 if (*bp == ',') {
391 if (cp) {
392 *bp = '\0';
393 *m++ = cp;
394 cp = NULL;
395 }
396 } else if (*bp == '\0' || *bp == '\n' || *bp == ' ') {
397 if (cp) {
398 *bp = '\0';
399 *m++ = cp;
400 }
401 break;
402 } else if (cp == NULL)
403 cp = bp;
404
405 }
406 _gr_group.gr_mem = members;
407 *m = NULL;
408 return(1);
409 }
410 /* NOTREACHED */
411 return (0);
412}
413
414#ifdef YP
415
416static int
417_gr_breakout_yp(struct group *gr, char *result)
418{
419 char *s, *cp;
420 char **m;
421
422 /*
423 * XXX If 's' ends up being a NULL pointer, punt on this group.
424 * It means the NIS group entry is badly formatted and should
425 * be skipped.
426 */
427 if ((s = strsep(&result, ":")) == NULL) return 0; /* name */
428 gr->gr_name = s;
429
430 if ((s = strsep(&result, ":")) == NULL) return 0; /* password */
431 gr->gr_passwd = s;
432
433 if ((s = strsep(&result, ":")) == NULL) return 0; /* gid */
434 gr->gr_gid = atoi(s);
435
436 if ((s = result) == NULL) return 0;
437 cp = 0;
438
439 for (m = members; ; s++) {
440 if (m == members + maxgrp - 1) {
441 if ((members = (char **)reallocf(members,
442 sizeof(char **) * (maxgrp + MAXGRP))) == NULL)
443 return(0);
444 m = members + maxgrp - 1;
445 maxgrp += MAXGRP;
446 }
447 if (*s == ',') {
448 if (cp) {
449 *s = '\0';
450 *m++ = cp;
451 cp = NULL;
452 }
453 } else if (*s == '\0' || *s == '\n' || *s == ' ') {
454 if (cp) {
455 *s = '\0';
456 *m++ = cp;
457 }
458 break;
459 } else if (cp == NULL) {
460 cp = s;
461 }
462 }
463 _gr_group.gr_mem = members;
464 *m = NULL;
465
466 return 1;
467}
468
469static char *_gr_yp_domain;
470
471static int
76f89ad8 472_getypgroup(struct group *gr, const char *name, const char *map)
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473{
474 char *result, *s;
475 static char resultbuf[YPMAXRECORD + 2];
476 int resultlen;
477
478 if(!_gr_yp_domain) {
479 if(yp_get_default_domain(&_gr_yp_domain))
480 return 0;
481 }
482
483 if(yp_match(_gr_yp_domain, map, name, strlen(name),
484 &result, &resultlen))
485 return 0;
486
487 s = strchr(result, '\n');
488 if(s) *s = '\0';
489
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490 if (strlcpy(resultbuf, result, sizeof(resultbuf)) >= sizeof(resultbuf))
491 return(0);
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492 free(result);
493 return(_gr_breakout_yp(gr, resultbuf));
494
495}
496
497
498static int
499_nextypgroup(struct group *gr)
500{
501 static char *key;
b0e25abd 502 static size_t keylen;
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503 char *lastkey, *result;
504 static char resultbuf[YPMAXRECORD + 2];
76f89ad8 505 size_t resultlen;
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506 int rv;
507
508 if(!_gr_yp_domain) {
509 if(yp_get_default_domain(&_gr_yp_domain))
510 return 0;
511 }
512
513 if(!_gr_stepping_yp) {
514 if(key) free(key);
515 rv = yp_first(_gr_yp_domain, "group.byname",
516 &key, &keylen, &result, &resultlen);
517 if(rv) {
518 return 0;
519 }
520 _gr_stepping_yp = 1;
521 goto unpack;
522 } else {
523tryagain:
524 lastkey = key;
525 rv = yp_next(_gr_yp_domain, "group.byname", key, keylen,
526 &key, &keylen, &result, &resultlen);
527 free(lastkey);
528unpack:
529 if(rv) {
530 _gr_stepping_yp = 0;
531 return 0;
532 }
533
534 if(resultlen > sizeof(resultbuf)) {
535 free(result);
536 goto tryagain;
537 }
538
539 strncpy(resultbuf, result, resultlen);
540 resultbuf[resultlen] = '\0';
541 free(result);
542 if((result = strchr(resultbuf, '\n')) != NULL)
543 *result = '\0';
544 if (_gr_breakout_yp(gr, resultbuf))
545 return(1);
546 else
547 goto tryagain;
548 }
549}
550
551#endif /* YP */