File: | src/lib/libc/gen/getgrent.c |
Warning: | line 201, column 6 Value stored to 'saved_errno' during its initialization is never read |
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1 | /* $OpenBSD: getgrent.c,v 1.48 2019/07/02 15:54:05 deraadt 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. Neither the name of the University nor the names of its contributors |
16 | * may be used to endorse or promote products derived from this software |
17 | * without specific prior written permission. |
18 | * |
19 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
29 | * SUCH DAMAGE. |
30 | */ |
31 | |
32 | #include <sys/types.h> |
33 | #include <stdio.h> |
34 | #include <stdlib.h> |
35 | #include <string.h> |
36 | #include <limits.h> |
37 | #include <unistd.h> |
38 | #include <grp.h> |
39 | #include <errno(*__errno()).h> |
40 | #ifdef YP1 |
41 | #include <rpc/rpc.h> |
42 | #include <rpcsvc/yp.h> |
43 | #include <rpcsvc/ypclnt.h> |
44 | #include "ypinternal.h" |
45 | #include "ypexclude.h" |
46 | #endif |
47 | #include "thread_private.h" |
48 | |
49 | /* This global storage is locked for the non-rentrant functions */ |
50 | _THREAD_PRIVATE_KEY(gr_storage)static void *_thread_tagname_gr_storage; |
51 | static struct group_storage { |
52 | #define MAXGRP200 200 |
53 | char *members[MAXGRP200]; |
54 | #define MAXLINELENGTH1024 1024 |
55 | char line[MAXLINELENGTH1024]; |
56 | } gr_storage; |
57 | #define GETGR_R_SIZE_MAX(1024+200*sizeof(char*)) _GR_BUF_LEN(1024+200*sizeof(char*)) |
58 | |
59 | /* File pointers are locked with the 'gr' mutex */ |
60 | _THREAD_PRIVATE_KEY(gr)static void *_thread_tagname_gr; |
61 | static FILE *_gr_fp; |
62 | static struct group _gr_group; |
63 | static int _gr_stayopen; |
64 | static int grscan(int, gid_t, const char *, struct group *, struct group_storage *, |
65 | int *); |
66 | static int start_gr(void); |
67 | static void endgrent_basic(void); |
68 | |
69 | static struct group *getgrnam_gs(const char *, struct group *, |
70 | struct group_storage *); |
71 | static struct group *getgrgid_gs(gid_t, struct group *, |
72 | struct group_storage *); |
73 | |
74 | #ifdef YP1 |
75 | static struct _ypexclude *__ypexhead = NULL((void *)0); |
76 | static int __ypmode = 0; |
77 | static char *__ypcurrent, *__ypdomain; |
78 | static int __ypcurrentlen; |
79 | #endif |
80 | |
81 | struct group * |
82 | _getgrent_yp(int *foundyp) |
83 | { |
84 | struct group *p_gr = (struct group*)_THREAD_PRIVATE(gr, _gr_group, NULL)(_thread_cb.tc_tag_storage == ((void *)0) ? &(_gr_group) : _thread_cb.tc_tag_storage(&(_thread_tagname_gr), &(_gr_group ), sizeof(_gr_group), ((void *)0), (((void *)0)))); |
85 | struct group_storage *gs = (struct group_storage *)_THREAD_PRIVATE(gr_storage,(_thread_cb.tc_tag_storage == ((void *)0) ? &(gr_storage) : _thread_cb.tc_tag_storage(&(_thread_tagname_gr_storage ), &(gr_storage), sizeof(gr_storage), ((void *)0), (((void *)0)))) |
86 | gr_storage, NULL)(_thread_cb.tc_tag_storage == ((void *)0) ? &(gr_storage) : _thread_cb.tc_tag_storage(&(_thread_tagname_gr_storage ), &(gr_storage), sizeof(gr_storage), ((void *)0), (((void *)0)))); |
87 | |
88 | _THREAD_PRIVATE_MUTEX_LOCK(gr)do { if (_thread_cb.tc_tag_lock != ((void *)0)) _thread_cb.tc_tag_lock (&(_thread_tagname_gr)); } while (0); |
89 | if ((!_gr_fp && !start_gr()) || !grscan(0, 0, NULL((void *)0), p_gr, gs, foundyp)) |
90 | p_gr = NULL((void *)0); |
91 | _THREAD_PRIVATE_MUTEX_UNLOCK(gr)do { if (_thread_cb.tc_tag_unlock != ((void *)0)) _thread_cb. tc_tag_unlock(&(_thread_tagname_gr)); } while (0); |
92 | return (p_gr); |
93 | } |
94 | |
95 | struct group * |
96 | getgrent(void) |
97 | { |
98 | return (_getgrent_yp(NULL((void *)0))); |
99 | } |
100 | |
101 | static struct group * |
102 | getgrnam_gs(const char *name, struct group *p_gr, struct group_storage *gs) |
103 | { |
104 | int rval; |
105 | |
106 | _THREAD_PRIVATE_MUTEX_LOCK(gr)do { if (_thread_cb.tc_tag_lock != ((void *)0)) _thread_cb.tc_tag_lock (&(_thread_tagname_gr)); } while (0); |
107 | if (!start_gr()) |
108 | rval = 0; |
109 | else { |
110 | rval = grscan(1, 0, name, p_gr, gs, NULL((void *)0)); |
111 | if (!_gr_stayopen) |
112 | endgrent_basic(); |
113 | } |
114 | _THREAD_PRIVATE_MUTEX_UNLOCK(gr)do { if (_thread_cb.tc_tag_unlock != ((void *)0)) _thread_cb. tc_tag_unlock(&(_thread_tagname_gr)); } while (0); |
115 | return(rval ? p_gr : NULL((void *)0)); |
116 | } |
117 | |
118 | struct group * |
119 | getgrnam(const char *name) |
120 | { |
121 | struct group *p_gr = (struct group*)_THREAD_PRIVATE(gr,_gr_group,NULL)(_thread_cb.tc_tag_storage == ((void *)0) ? &(_gr_group) : _thread_cb.tc_tag_storage(&(_thread_tagname_gr), &(_gr_group ), sizeof(_gr_group), ((void *)0), (((void *)0)))); |
122 | struct group_storage *gs = (struct group_storage *)_THREAD_PRIVATE(gr_storage,(_thread_cb.tc_tag_storage == ((void *)0) ? &(gr_storage) : _thread_cb.tc_tag_storage(&(_thread_tagname_gr_storage ), &(gr_storage), sizeof(gr_storage), ((void *)0), (((void *)0)))) |
123 | gr_storage, NULL)(_thread_cb.tc_tag_storage == ((void *)0) ? &(gr_storage) : _thread_cb.tc_tag_storage(&(_thread_tagname_gr_storage ), &(gr_storage), sizeof(gr_storage), ((void *)0), (((void *)0)))); |
124 | |
125 | return getgrnam_gs(name, p_gr, gs); |
126 | } |
127 | |
128 | int |
129 | getgrnam_r(const char *name, struct group *grp, char *buffer, |
130 | size_t bufsize, struct group **result) |
131 | { |
132 | int errnosave; |
133 | int ret; |
134 | |
135 | if (bufsize < GETGR_R_SIZE_MAX(1024+200*sizeof(char*))) |
136 | return ERANGE34; |
137 | errnosave = errno(*__errno()); |
138 | errno(*__errno()) = 0; |
139 | *result = getgrnam_gs(name, grp, (struct group_storage *)buffer); |
140 | if (*result == NULL((void *)0)) |
141 | ret = errno(*__errno()); |
142 | else |
143 | ret = 0; |
144 | errno(*__errno()) = errnosave; |
145 | return ret; |
146 | } |
147 | DEF_WEAK(getgrnam_r)__asm__(".weak " "getgrnam_r" " ; " "getgrnam_r" " = " "_libc_getgrnam_r" ); |
148 | |
149 | static struct group * |
150 | getgrgid_gs(gid_t gid, struct group *p_gr, struct group_storage *gs) |
151 | { |
152 | int rval; |
153 | |
154 | _THREAD_PRIVATE_MUTEX_LOCK(gr)do { if (_thread_cb.tc_tag_lock != ((void *)0)) _thread_cb.tc_tag_lock (&(_thread_tagname_gr)); } while (0); |
155 | if (!start_gr()) |
156 | rval = 0; |
157 | else { |
158 | rval = grscan(1, gid, NULL((void *)0), p_gr, gs, NULL((void *)0)); |
159 | if (!_gr_stayopen) |
160 | endgrent_basic(); |
161 | } |
162 | _THREAD_PRIVATE_MUTEX_UNLOCK(gr)do { if (_thread_cb.tc_tag_unlock != ((void *)0)) _thread_cb. tc_tag_unlock(&(_thread_tagname_gr)); } while (0); |
163 | return(rval ? p_gr : NULL((void *)0)); |
164 | } |
165 | |
166 | struct group * |
167 | getgrgid(gid_t gid) |
168 | { |
169 | struct group *p_gr = (struct group*)_THREAD_PRIVATE(gr, _gr_group, NULL)(_thread_cb.tc_tag_storage == ((void *)0) ? &(_gr_group) : _thread_cb.tc_tag_storage(&(_thread_tagname_gr), &(_gr_group ), sizeof(_gr_group), ((void *)0), (((void *)0)))); |
170 | struct group_storage *gs = (struct group_storage *)_THREAD_PRIVATE(gr_storage,(_thread_cb.tc_tag_storage == ((void *)0) ? &(gr_storage) : _thread_cb.tc_tag_storage(&(_thread_tagname_gr_storage ), &(gr_storage), sizeof(gr_storage), ((void *)0), (((void *)0)))) |
171 | gr_storage, NULL)(_thread_cb.tc_tag_storage == ((void *)0) ? &(gr_storage) : _thread_cb.tc_tag_storage(&(_thread_tagname_gr_storage ), &(gr_storage), sizeof(gr_storage), ((void *)0), (((void *)0)))); |
172 | |
173 | return getgrgid_gs(gid, p_gr, gs); |
174 | } |
175 | |
176 | int |
177 | getgrgid_r(gid_t gid, struct group *grp, char *buffer, size_t bufsize, |
178 | struct group **result) |
179 | { |
180 | int errnosave; |
181 | int ret; |
182 | |
183 | if (bufsize < GETGR_R_SIZE_MAX(1024+200*sizeof(char*))) |
184 | return ERANGE34; |
185 | errnosave = errno(*__errno()); |
186 | errno(*__errno()) = 0; |
187 | *result = getgrgid_gs(gid, grp, (struct group_storage *)buffer); |
188 | if (*result == NULL((void *)0)) |
189 | ret = errno(*__errno()); |
190 | else |
191 | ret = 0; |
192 | errno(*__errno()) = errnosave; |
193 | return ret; |
194 | } |
195 | DEF_WEAK(getgrgid_r)__asm__(".weak " "getgrgid_r" " ; " "getgrgid_r" " = " "_libc_getgrgid_r" ); |
196 | |
197 | static int |
198 | start_gr(void) |
199 | { |
200 | #ifdef YP1 |
201 | int saved_errno = errno(*__errno()); |
Value stored to 'saved_errno' during its initialization is never read | |
202 | #endif |
203 | |
204 | if (_gr_fp) { |
205 | rewind(_gr_fp); |
206 | #ifdef YP1 |
207 | __ypmode = 0; |
208 | free(__ypcurrent); |
209 | __ypcurrent = NULL((void *)0); |
210 | if (__ypexhead) |
211 | __ypexclude_free(&__ypexhead); |
212 | __ypexhead = NULL((void *)0); |
213 | #endif |
214 | return(1); |
215 | } |
216 | |
217 | #ifdef YP1 |
218 | /* |
219 | * Hint to the kernel that a passwd database operation is happening. |
220 | */ |
221 | saved_errno = errno(*__errno()); |
222 | (void)access("/var/run/ypbind.lock", R_OK0x04); |
223 | errno(*__errno()) = saved_errno; |
224 | #endif |
225 | |
226 | return((_gr_fp = fopen(_PATH_GROUP"/etc/group", "re")) ? 1 : 0); |
227 | } |
228 | |
229 | void |
230 | setgrent(void) |
231 | { |
232 | int saved_errno; |
233 | |
234 | saved_errno = errno(*__errno()); |
235 | setgroupent(0); |
236 | errno(*__errno()) = saved_errno; |
237 | } |
238 | DEF_WEAK(setgrent)__asm__(".weak " "setgrent" " ; " "setgrent" " = " "_libc_setgrent" ); |
239 | |
240 | int |
241 | setgroupent(int stayopen) |
242 | { |
243 | int retval; |
244 | |
245 | _THREAD_PRIVATE_MUTEX_LOCK(gr)do { if (_thread_cb.tc_tag_lock != ((void *)0)) _thread_cb.tc_tag_lock (&(_thread_tagname_gr)); } while (0); |
246 | if (!start_gr()) |
247 | retval = 0; |
248 | else { |
249 | _gr_stayopen = stayopen; |
250 | retval = 1; |
251 | } |
252 | _THREAD_PRIVATE_MUTEX_UNLOCK(gr)do { if (_thread_cb.tc_tag_unlock != ((void *)0)) _thread_cb. tc_tag_unlock(&(_thread_tagname_gr)); } while (0); |
253 | return (retval); |
254 | } |
255 | DEF_WEAK(setgroupent)__asm__(".weak " "setgroupent" " ; " "setgroupent" " = " "_libc_setgroupent" ); |
256 | |
257 | static |
258 | void |
259 | endgrent_basic(void) |
260 | { |
261 | int saved_errno; |
262 | |
263 | if (_gr_fp) { |
264 | saved_errno = errno(*__errno()); |
265 | fclose(_gr_fp); |
266 | _gr_fp = NULL((void *)0); |
267 | #ifdef YP1 |
268 | __ypmode = 0; |
269 | free(__ypcurrent); |
270 | __ypcurrent = NULL((void *)0); |
271 | if (__ypexhead) |
272 | __ypexclude_free(&__ypexhead); |
273 | __ypexhead = NULL((void *)0); |
274 | #endif |
275 | errno(*__errno()) = saved_errno; |
276 | } |
277 | } |
278 | |
279 | void |
280 | endgrent(void) |
281 | { |
282 | _THREAD_PRIVATE_MUTEX_LOCK(gr)do { if (_thread_cb.tc_tag_lock != ((void *)0)) _thread_cb.tc_tag_lock (&(_thread_tagname_gr)); } while (0); |
283 | endgrent_basic(); |
284 | _THREAD_PRIVATE_MUTEX_UNLOCK(gr)do { if (_thread_cb.tc_tag_unlock != ((void *)0)) _thread_cb. tc_tag_unlock(&(_thread_tagname_gr)); } while (0); |
285 | } |
286 | DEF_WEAK(endgrent)__asm__(".weak " "endgrent" " ; " "endgrent" " = " "_libc_endgrent" ); |
287 | |
288 | static int |
289 | grscan(int search, gid_t gid, const char *name, struct group *p_gr, |
290 | struct group_storage *gs, int *foundyp) |
291 | { |
292 | char *cp, **m; |
293 | char *bp, *endp; |
294 | u_long ul; |
295 | #ifdef YP1 |
296 | char *key, *data; |
297 | int keylen, datalen; |
298 | int r; |
299 | #endif |
300 | char **members; |
301 | char *line; |
302 | int saved_errno; |
303 | |
304 | if (gs == NULL((void *)0)) |
305 | return 0; |
306 | members = gs->members; |
307 | line = gs->line; |
308 | saved_errno = errno(*__errno()); |
309 | |
310 | for (;;) { |
311 | #ifdef YP1 |
312 | if (__ypmode) { |
313 | if (__ypcurrent) { |
314 | r = yp_next(__ypdomain, "group.byname", |
315 | __ypcurrent, __ypcurrentlen, |
316 | &key, &keylen, &data, &datalen); |
317 | free(__ypcurrent); |
318 | __ypcurrent = key; |
319 | __ypcurrentlen = keylen; |
320 | } else { |
321 | r = yp_first(__ypdomain, "group.byname", |
322 | &__ypcurrent, &__ypcurrentlen, |
323 | &data, &datalen); |
324 | } |
325 | if (r) { |
326 | __ypmode = 0; |
327 | __ypcurrent = NULL((void *)0); |
328 | if (r == YPERR_NOMORE8) |
329 | continue; |
330 | else |
331 | return 0; |
332 | } |
333 | bcopy(data, line, datalen); |
334 | free(data); |
335 | line[datalen] = '\0'; |
336 | bp = line; |
337 | goto parse; |
338 | } |
339 | #endif |
340 | if (!fgets(line, sizeof(gs->line), _gr_fp)) { |
341 | if (feof(_gr_fp)(!__isthreaded ? (((_gr_fp)->_flags & 0x0020) != 0) : ( feof)(_gr_fp)) && !ferror(_gr_fp)(!__isthreaded ? (((_gr_fp)->_flags & 0x0040) != 0) : ( ferror)(_gr_fp))) |
342 | errno(*__errno()) = saved_errno; |
343 | return 0; |
344 | } |
345 | bp = line; |
346 | /* skip lines that are too big */ |
347 | if (!strchr(line, '\n')) { |
348 | int ch; |
349 | |
350 | while ((ch = getc_unlocked(_gr_fp)(--(_gr_fp)->_r < 0 ? __srget(_gr_fp) : (int)(*(_gr_fp) ->_p++))) != '\n' && |
351 | ch != EOF(-1)) |
352 | ; |
353 | continue; |
354 | } |
355 | #ifdef YP1 |
356 | if (line[0] == '+' || line[0] == '-') { |
357 | if (__ypdomain == NULL((void *)0) && |
358 | yp_get_default_domain(&__ypdomain)) |
359 | goto parse; |
360 | switch (yp_bind(__ypdomain)) { |
361 | case 0: |
362 | break; |
363 | case YPERR_BADARGS1: |
364 | case YPERR_YPBIND10: |
365 | goto parse; |
366 | default: |
367 | return 0; |
368 | } |
369 | } |
370 | if (line[0] == '+') { |
371 | switch (line[1]) { |
372 | case ':': |
373 | case '\0': |
374 | case '\n': |
375 | if (foundyp) { |
376 | *foundyp = 1; |
377 | errno(*__errno()) = saved_errno; |
378 | return 0; |
379 | } |
380 | if (!search) { |
381 | __ypmode = 1; |
382 | continue; |
383 | } |
384 | if (name) { |
385 | r = yp_match(__ypdomain, |
386 | "group.byname", name, strlen(name), |
387 | &data, &datalen); |
388 | } else { |
389 | char buf[20]; |
390 | snprintf(buf, sizeof buf, "%u", gid); |
391 | r = yp_match(__ypdomain, "group.bygid", |
392 | buf, strlen(buf), &data, &datalen); |
393 | } |
394 | switch (r) { |
395 | case 0: |
396 | break; |
397 | case YPERR_KEY5: |
398 | continue; |
399 | default: |
400 | return 0; |
401 | } |
402 | bcopy(data, line, datalen); |
403 | free(data); |
404 | line[datalen] = '\0'; |
405 | bp = line; |
406 | p_gr->gr_name = strsep(&bp, ":\n"); |
407 | if (__ypexclude_is(&__ypexhead, p_gr->gr_name)) |
408 | continue; |
409 | p_gr->gr_passwd = strsep(&bp, ":\n"); |
410 | if (!(cp = strsep(&bp, ":\n"))) |
411 | continue; |
412 | if (name) { |
413 | ul = strtoul(cp, &endp, 10); |
414 | if (*endp != '\0' || endp == cp || |
415 | ul >= GID_MAX(2147483647 *2U +1U)) |
416 | continue; |
417 | p_gr->gr_gid = ul; |
418 | } else |
419 | p_gr->gr_gid = gid; |
420 | goto found_it; |
421 | default: |
422 | bp = strsep(&bp, ":\n") + 1; |
423 | if ((search && name && strcmp(bp, name)) || |
424 | __ypexclude_is(&__ypexhead, bp)) |
425 | continue; |
426 | r = yp_match(__ypdomain, "group.byname", |
427 | bp, strlen(bp), &data, &datalen); |
428 | switch (r) { |
429 | case 0: |
430 | break; |
431 | case YPERR_KEY5: |
432 | continue; |
433 | default: |
434 | return 0; |
435 | } |
436 | bcopy(data, line, datalen); |
437 | free(data); |
438 | line[datalen] = '\0'; |
439 | bp = line; |
440 | } |
441 | } else if (line[0] == '-') { |
442 | if (__ypexclude_add(&__ypexhead, |
443 | strsep(&line, ":\n") + 1)) |
444 | return 0; |
445 | if (foundyp) { |
446 | *foundyp = -1; |
447 | errno(*__errno()) = saved_errno; |
448 | return 0; |
449 | } |
450 | continue; |
451 | } |
452 | parse: |
453 | #endif |
454 | p_gr->gr_name = strsep(&bp, ":\n"); |
455 | if (search && name && strcmp(p_gr->gr_name, name)) |
456 | continue; |
457 | #ifdef YP1 |
458 | if (__ypmode && __ypexclude_is(&__ypexhead, p_gr->gr_name)) |
459 | continue; |
460 | #endif |
461 | p_gr->gr_passwd = strsep(&bp, ":\n"); |
462 | if (!(cp = strsep(&bp, ":\n"))) |
463 | continue; |
464 | ul = strtoul(cp, &endp, 10); |
465 | if (endp == cp || *endp != '\0' || ul >= GID_MAX(2147483647 *2U +1U)) |
466 | continue; |
467 | p_gr->gr_gid = ul; |
468 | if (search && name == NULL((void *)0) && p_gr->gr_gid != gid) |
469 | continue; |
470 | #ifdef YP1 |
471 | found_it: |
472 | #endif |
473 | cp = NULL((void *)0); |
474 | if (bp == NULL((void *)0)) |
475 | continue; |
476 | for (m = p_gr->gr_mem = members;; bp++) { |
477 | if (m == &members[MAXGRP200 - 1]) |
478 | break; |
479 | if (*bp == ',') { |
480 | if (cp) { |
481 | *bp = '\0'; |
482 | *m++ = cp; |
483 | cp = NULL((void *)0); |
484 | } |
485 | } else if (*bp == '\0' || *bp == '\n' || *bp == ' ') { |
486 | if (cp) { |
487 | *bp = '\0'; |
488 | *m++ = cp; |
489 | } |
490 | break; |
491 | } else if (cp == NULL((void *)0)) |
492 | cp = bp; |
493 | } |
494 | *m = NULL((void *)0); |
495 | errno(*__errno()) = saved_errno; |
496 | return 1; |
497 | } |
498 | /* NOTREACHED */ |
499 | } |