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sdiff udiff text old ( 243334 ) new ( 244735 )
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gr_util.c (243334) gr_util.c (244735)
1/*-
2 * Copyright (c) 2008 Sean C. Farley <scf@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer,
10 * without modification, immediately at the beginning of the file.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
1/*-
2 * Copyright (c) 2008 Sean C. Farley <scf@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer,
10 * without modification, immediately at the beginning of the file.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/lib/libutil/gr_util.c 243334 2012-11-20 14:03:09Z bapt $");
28__FBSDID("$FreeBSD: head/lib/libutil/gr_util.c 244735 2012-12-27 14:09:50Z bapt $");
29
30#include <sys/param.h>
31#include <sys/errno.h>
32#include <sys/stat.h>
33
34#include <ctype.h>
35#include <err.h>
36#include <fcntl.h>
37#include <grp.h>
38#include <inttypes.h>
39#include <libutil.h>
40#include <paths.h>
41#include <stdbool.h>
42#include <stdio.h>
43#include <stdlib.h>
44#include <string.h>
45#include <unistd.h>
46
47struct group_storage {
48 struct group gr;
49 char *members[];
50};
51
52static int lockfd = -1;
53static char group_dir[PATH_MAX];
54static char group_file[PATH_MAX];
55static char tempname[PATH_MAX];
56static int initialized;
57
58static const char group_line_format[] = "%s:%s:%ju:";
59
60/*
61 * Initialize statics
62 */
63int
64gr_init(const char *dir, const char *group)
65{
66
67 if (dir == NULL) {
68 strcpy(group_dir, _PATH_ETC);
69 } else {
70 if (strlen(dir) >= sizeof(group_dir)) {
71 errno = ENAMETOOLONG;
72 return (-1);
73 }
74 strcpy(group_dir, dir);
75 }
76
77 if (group == NULL) {
78 if (dir == NULL) {
79 strcpy(group_file, _PATH_GROUP);
80 } else if (snprintf(group_file, sizeof(group_file), "%s/group",
81 group_dir) > (int)sizeof(group_file)) {
82 errno = ENAMETOOLONG;
83 return (-1);
84 }
85 } else {
86 if (strlen(group) >= sizeof(group_file)) {
87 errno = ENAMETOOLONG;
88 return (-1);
89 }
90 strcpy(group_file, group);
91 }
92
93 initialized = 1;
94 return (0);
95}
96
97/*
98 * Lock the group file
99 */
100int
101gr_lock(void)
102{
103 if (*group_file == '\0')
104 return (-1);
105
106 for (;;) {
107 struct stat st;
108
29
30#include <sys/param.h>
31#include <sys/errno.h>
32#include <sys/stat.h>
33
34#include <ctype.h>
35#include <err.h>
36#include <fcntl.h>
37#include <grp.h>
38#include <inttypes.h>
39#include <libutil.h>
40#include <paths.h>
41#include <stdbool.h>
42#include <stdio.h>
43#include <stdlib.h>
44#include <string.h>
45#include <unistd.h>
46
47struct group_storage {
48 struct group gr;
49 char *members[];
50};
51
52static int lockfd = -1;
53static char group_dir[PATH_MAX];
54static char group_file[PATH_MAX];
55static char tempname[PATH_MAX];
56static int initialized;
57
58static const char group_line_format[] = "%s:%s:%ju:";
59
60/*
61 * Initialize statics
62 */
63int
64gr_init(const char *dir, const char *group)
65{
66
67 if (dir == NULL) {
68 strcpy(group_dir, _PATH_ETC);
69 } else {
70 if (strlen(dir) >= sizeof(group_dir)) {
71 errno = ENAMETOOLONG;
72 return (-1);
73 }
74 strcpy(group_dir, dir);
75 }
76
77 if (group == NULL) {
78 if (dir == NULL) {
79 strcpy(group_file, _PATH_GROUP);
80 } else if (snprintf(group_file, sizeof(group_file), "%s/group",
81 group_dir) > (int)sizeof(group_file)) {
82 errno = ENAMETOOLONG;
83 return (-1);
84 }
85 } else {
86 if (strlen(group) >= sizeof(group_file)) {
87 errno = ENAMETOOLONG;
88 return (-1);
89 }
90 strcpy(group_file, group);
91 }
92
93 initialized = 1;
94 return (0);
95}
96
97/*
98 * Lock the group file
99 */
100int
101gr_lock(void)
102{
103 if (*group_file == '\0')
104 return (-1);
105
106 for (;;) {
107 struct stat st;
108
109 lockfd = open(group_file, O_RDONLY, 0);
110 if (lockfd < 0 || fcntl(lockfd, F_SETFD, 1) == -1)
111 err(1, "%s", group_file);
112 if (flock(lockfd, LOCK_EX|LOCK_NB) == -1) {
109 lockfd = flopen(group_file, O_RDONLY|O_NONBLOCK, 0);
110 if (lockfd == -1) {
113 if (errno == EWOULDBLOCK) {
114 errx(1, "the group file is busy");
115 } else {
116 err(1, "could not lock the group file: ");
117 }
118 }
119 if (fstat(lockfd, &st) == -1)
120 err(1, "fstat() failed: ");
121 if (st.st_nlink != 0)
122 break;
123 close(lockfd);
124 lockfd = -1;
125 }
126 return (lockfd);
127}
128
129/*
130 * Create and open a presmuably safe temp file for editing group data
131 */
132int
133gr_tmp(int mfd)
134{
135 char buf[8192];
136 ssize_t nr;
137 const char *p;
138 int tfd;
139
140 if (*group_file == '\0')
141 return (-1);
142 if ((p = strrchr(group_file, '/')))
143 ++p;
144 else
145 p = group_file;
146 if (snprintf(tempname, sizeof(tempname), "%.*sgroup.XXXXXX",
147 (int)(p - group_file), group_file) >= (int)sizeof(tempname)) {
148 errno = ENAMETOOLONG;
149 return (-1);
150 }
151 if ((tfd = mkstemp(tempname)) == -1)
152 return (-1);
153 if (mfd != -1) {
154 while ((nr = read(mfd, buf, sizeof(buf))) > 0)
155 if (write(tfd, buf, (size_t)nr) != nr)
156 break;
157 if (nr != 0) {
158 unlink(tempname);
159 *tempname = '\0';
160 close(tfd);
161 return (-1);
162 }
163 }
164 return (tfd);
165}
166
167/*
168 * Copy the group file from one descriptor to another, replacing, deleting
169 * or adding a single record on the way.
170 */
171int
172gr_copy(int ffd, int tfd, const struct group *gr, struct group *old_gr)
173{
174 char buf[8192], *end, *line, *p, *q, *r, t;
175 struct group *fgr;
176 const struct group *sgr;
177 size_t len;
178 int eof, readlen;
179
180 sgr = gr;
181 if (gr == NULL) {
182 line = NULL;
183 if (old_gr == NULL)
184 return (-1);
185 sgr = old_gr;
186 } else if ((line = gr_make(gr)) == NULL)
187 return (-1);
188
189 eof = 0;
190 len = 0;
191 p = q = end = buf;
192 for (;;) {
193 /* find the end of the current line */
194 for (p = q; q < end && *q != '\0'; ++q)
195 if (*q == '\n')
196 break;
197
198 /* if we don't have a complete line, fill up the buffer */
199 if (q >= end) {
200 if (eof)
201 break;
202 if ((size_t)(q - p) >= sizeof(buf)) {
203 warnx("group line too long");
204 errno = EINVAL; /* hack */
205 goto err;
206 }
207 if (p < end) {
208 q = memmove(buf, p, end -p);
209 end -= p - buf;
210 } else {
211 p = q = end = buf;
212 }
213 readlen = read(ffd, end, sizeof(buf) - (end -buf));
214 if (readlen == -1)
215 goto err;
216 else
217 len = (size_t)readlen;
218 if (len == 0 && p == buf)
219 break;
220 end += len;
221 len = end - buf;
222 if (len < (ssize_t)sizeof(buf)) {
223 eof = 1;
224 if (len > 0 && buf[len -1] != '\n')
225 ++len, *end++ = '\n';
226 }
227 continue;
228 }
229
230 /* is it a blank line or a comment? */
231 for (r = p; r < q && isspace(*r); ++r)
232 /* nothing */;
233 if (r == q || *r == '#') {
234 /* yep */
235 if (write(tfd, p, q -p + 1) != q - p + 1)
236 goto err;
237 ++q;
238 continue;
239 }
240
241 /* is it the one we're looking for? */
242
243 t = *q;
244 *q = '\0';
245
246 fgr = gr_scan(r);
247
248 /* fgr is either a struct group for the current line,
249 * or NULL if the line is malformed.
250 */
251
252 *q = t;
253 if (fgr == NULL || fgr->gr_gid != sgr->gr_gid) {
254 /* nope */
255 if (fgr != NULL)
256 free(fgr);
257 if (write(tfd, p, q - p + 1) != q - p + 1)
258 goto err;
259 ++q;
260 continue;
261 }
262 if (old_gr && !gr_equal(fgr, old_gr)) {
263 warnx("entry inconsistent");
264 free(fgr);
265 errno = EINVAL; /* hack */
266 goto err;
267 }
268 free(fgr);
269
270 /* it is, replace or remove it */
271 if (line != NULL) {
272 len = strlen(line);
273 if (write(tfd, line, len) != (int) len)
274 goto err;
275 } else {
276 /* when removed, avoid the \n */
277 q++;
278 }
279 /* we're done, just copy the rest over */
280 for (;;) {
281 if (write(tfd, q, end - q) != end - q)
282 goto err;
283 q = buf;
284 readlen = read(ffd, buf, sizeof(buf));
285 if (readlen == 0)
286 break;
287 else
288 len = (size_t)readlen;
289 if (readlen == -1)
290 goto err;
291 end = buf + len;
292 }
293 goto done;
294 }
295
296 /* if we got here, we didn't find the old entry */
297 if (line == NULL) {
298 errno = ENOENT;
299 goto err;
300 }
301 len = strlen(line);
302 if ((size_t)write(tfd, line, len) != len ||
303 write(tfd, "\n", 1) != 1)
304 goto err;
305 done:
306 if (line != NULL)
307 free(line);
308 return (0);
309 err:
310 if (line != NULL)
311 free(line);
312 return (-1);
313}
314
315/*
316 * Regenerate the group file
317 */
318int
319gr_mkdb(void)
320{
321 if (chmod(tempname, 0644) != 0)
322 return (-1);
323
324 return (rename(tempname, group_file));
325}
326
327/*
328 * Clean up. Preserver errno for the caller's convenience.
329 */
330void
331gr_fini(void)
332{
333 int serrno;
334
335 if (!initialized)
336 return;
337 initialized = 0;
338 serrno = errno;
339 if (*tempname != '\0') {
340 unlink(tempname);
341 *tempname = '\0';
342 }
343 if (lockfd != -1)
344 close(lockfd);
345 errno = serrno;
346}
347
348/*
349 * Compares two struct group's.
350 */
351int
352gr_equal(const struct group *gr1, const struct group *gr2)
353{
354 int gr1_ndx;
355 int gr2_ndx;
356 bool found;
357
358 /* Check that the non-member information is the same. */
359 if (gr1->gr_name == NULL || gr2->gr_name == NULL) {
360 if (gr1->gr_name != gr2->gr_name)
361 return (false);
362 } else if (strcmp(gr1->gr_name, gr2->gr_name) != 0)
363 return (false);
364 if (gr1->gr_passwd == NULL || gr2->gr_passwd == NULL) {
365 if (gr1->gr_passwd != gr2->gr_passwd)
366 return (false);
367 } else if (strcmp(gr1->gr_passwd, gr2->gr_passwd) != 0)
368 return (false);
369 if (gr1->gr_gid != gr2->gr_gid)
370 return (false);
371
372 /* Check all members in both groups. */
373 if (gr1->gr_mem == NULL || gr2->gr_mem == NULL) {
374 if (gr1->gr_mem != gr2->gr_mem)
375 return (false);
376 } else {
377 for (found = false, gr1_ndx = 0; gr1->gr_mem[gr1_ndx] != NULL;
378 gr1_ndx++) {
379 for (gr2_ndx = 0; gr2->gr_mem[gr2_ndx] != NULL;
380 gr2_ndx++)
381 if (strcmp(gr1->gr_mem[gr1_ndx],
382 gr2->gr_mem[gr2_ndx]) == 0) {
383 found = true;
384 break;
385 }
386 if (!found)
387 return (false);
388 }
389
390 /* Check that group2 does not have more members than group1. */
391 if (gr2->gr_mem[gr1_ndx] != NULL)
392 return (false);
393 }
394
395 return (true);
396}
397
398/*
399 * Make a group line out of a struct group.
400 */
401char *
402gr_make(const struct group *gr)
403{
404 char *line;
405 size_t line_size;
406 int ndx;
407
408 /* Calculate the length of the group line. */
409 line_size = snprintf(NULL, 0, group_line_format, gr->gr_name,
410 gr->gr_passwd, (uintmax_t)gr->gr_gid) + 1;
411 if (gr->gr_mem != NULL) {
412 for (ndx = 0; gr->gr_mem[ndx] != NULL; ndx++)
413 line_size += strlen(gr->gr_mem[ndx]) + 1;
414 if (ndx > 0)
415 line_size--;
416 }
417
418 /* Create the group line and fill it. */
419 if ((line = malloc(line_size)) == NULL)
420 return (NULL);
421 snprintf(line, line_size, group_line_format, gr->gr_name, gr->gr_passwd,
422 (uintmax_t)gr->gr_gid);
423 if (gr->gr_mem != NULL)
424 for (ndx = 0; gr->gr_mem[ndx] != NULL; ndx++) {
425 strcat(line, gr->gr_mem[ndx]);
426 if (gr->gr_mem[ndx + 1] != NULL)
427 strcat(line, ",");
428 }
429
430 return (line);
431}
432
433/*
434 * Duplicate a struct group.
435 */
436struct group *
437gr_dup(const struct group *gr)
438{
439 char *dst;
440 size_t len;
441 struct group_storage *gs;
442 int ndx;
443 int num_mem;
444
445 /* Calculate size of the group. */
446 len = sizeof(*gs);
447 if (gr->gr_name != NULL)
448 len += strlen(gr->gr_name) + 1;
449 if (gr->gr_passwd != NULL)
450 len += strlen(gr->gr_passwd) + 1;
451 if (gr->gr_mem != NULL) {
452 for (num_mem = 0; gr->gr_mem[num_mem] != NULL; num_mem++)
453 len += strlen(gr->gr_mem[num_mem]) + 1;
454 len += (num_mem + 1) * sizeof(*gr->gr_mem);
455 } else
456 num_mem = -1;
457
458 /* Create new group and copy old group into it. */
459 if ((gs = calloc(1, len)) == NULL)
460 return (NULL);
461 dst = (char *)&gs->members[num_mem + 1];
462 if (gr->gr_name != NULL) {
463 gs->gr.gr_name = dst;
464 dst = stpcpy(gs->gr.gr_name, gr->gr_name) + 1;
465 }
466 if (gr->gr_passwd != NULL) {
467 gs->gr.gr_passwd = dst;
468 dst = stpcpy(gs->gr.gr_passwd, gr->gr_passwd) + 1;
469 }
470 gs->gr.gr_gid = gr->gr_gid;
471 if (gr->gr_mem != NULL) {
472 gs->gr.gr_mem = gs->members;
473 for (ndx = 0; ndx < num_mem; ndx++) {
474 gs->gr.gr_mem[ndx] = dst;
475 dst = stpcpy(gs->gr.gr_mem[ndx], gr->gr_mem[ndx]) + 1;
476 }
477 gs->gr.gr_mem[ndx] = NULL;
478 }
479
480 return (&gs->gr);
481}
482
483/*
484 * Scan a line and place it into a group structure.
485 */
486static bool
487__gr_scan(char *line, struct group *gr)
488{
489 char *loc;
490 int ndx;
491
492 /* Assign non-member information to structure. */
493 gr->gr_name = line;
494 if ((loc = strchr(line, ':')) == NULL)
495 return (false);
496 *loc = '\0';
497 gr->gr_passwd = loc + 1;
498 if (*gr->gr_passwd == ':')
499 *gr->gr_passwd = '\0';
500 else {
501 if ((loc = strchr(loc + 1, ':')) == NULL)
502 return (false);
503 *loc = '\0';
504 }
505 if (sscanf(loc + 1, "%u", &gr->gr_gid) != 1)
506 return (false);
507
508 /* Assign member information to structure. */
509 if ((loc = strchr(loc + 1, ':')) == NULL)
510 return (false);
511 line = loc + 1;
512 gr->gr_mem = NULL;
513 ndx = 0;
514 do {
515 gr->gr_mem = reallocf(gr->gr_mem, sizeof(*gr->gr_mem) *
516 (ndx + 1));
517 if (gr->gr_mem == NULL)
518 return (false);
519
520 /* Skip locations without members (i.e., empty string). */
521 do {
522 gr->gr_mem[ndx] = strsep(&line, ",");
523 } while (gr->gr_mem[ndx] != NULL && *gr->gr_mem[ndx] == '\0');
524 } while (gr->gr_mem[ndx++] != NULL);
525
526 return (true);
527}
528
529/*
530 * Create a struct group from a line.
531 */
532struct group *
533gr_scan(const char *line)
534{
535 struct group gr;
536 char *line_copy;
537 struct group *new_gr;
538
539 if ((line_copy = strdup(line)) == NULL)
540 return (NULL);
541 if (!__gr_scan(line_copy, &gr)) {
542 free(line_copy);
543 return (NULL);
544 }
545 new_gr = gr_dup(&gr);
546 free(line_copy);
547 if (gr.gr_mem != NULL)
548 free(gr.gr_mem);
549
550 return (new_gr);
551}
111 if (errno == EWOULDBLOCK) {
112 errx(1, "the group file is busy");
113 } else {
114 err(1, "could not lock the group file: ");
115 }
116 }
117 if (fstat(lockfd, &st) == -1)
118 err(1, "fstat() failed: ");
119 if (st.st_nlink != 0)
120 break;
121 close(lockfd);
122 lockfd = -1;
123 }
124 return (lockfd);
125}
126
127/*
128 * Create and open a presmuably safe temp file for editing group data
129 */
130int
131gr_tmp(int mfd)
132{
133 char buf[8192];
134 ssize_t nr;
135 const char *p;
136 int tfd;
137
138 if (*group_file == '\0')
139 return (-1);
140 if ((p = strrchr(group_file, '/')))
141 ++p;
142 else
143 p = group_file;
144 if (snprintf(tempname, sizeof(tempname), "%.*sgroup.XXXXXX",
145 (int)(p - group_file), group_file) >= (int)sizeof(tempname)) {
146 errno = ENAMETOOLONG;
147 return (-1);
148 }
149 if ((tfd = mkstemp(tempname)) == -1)
150 return (-1);
151 if (mfd != -1) {
152 while ((nr = read(mfd, buf, sizeof(buf))) > 0)
153 if (write(tfd, buf, (size_t)nr) != nr)
154 break;
155 if (nr != 0) {
156 unlink(tempname);
157 *tempname = '\0';
158 close(tfd);
159 return (-1);
160 }
161 }
162 return (tfd);
163}
164
165/*
166 * Copy the group file from one descriptor to another, replacing, deleting
167 * or adding a single record on the way.
168 */
169int
170gr_copy(int ffd, int tfd, const struct group *gr, struct group *old_gr)
171{
172 char buf[8192], *end, *line, *p, *q, *r, t;
173 struct group *fgr;
174 const struct group *sgr;
175 size_t len;
176 int eof, readlen;
177
178 sgr = gr;
179 if (gr == NULL) {
180 line = NULL;
181 if (old_gr == NULL)
182 return (-1);
183 sgr = old_gr;
184 } else if ((line = gr_make(gr)) == NULL)
185 return (-1);
186
187 eof = 0;
188 len = 0;
189 p = q = end = buf;
190 for (;;) {
191 /* find the end of the current line */
192 for (p = q; q < end && *q != '\0'; ++q)
193 if (*q == '\n')
194 break;
195
196 /* if we don't have a complete line, fill up the buffer */
197 if (q >= end) {
198 if (eof)
199 break;
200 if ((size_t)(q - p) >= sizeof(buf)) {
201 warnx("group line too long");
202 errno = EINVAL; /* hack */
203 goto err;
204 }
205 if (p < end) {
206 q = memmove(buf, p, end -p);
207 end -= p - buf;
208 } else {
209 p = q = end = buf;
210 }
211 readlen = read(ffd, end, sizeof(buf) - (end -buf));
212 if (readlen == -1)
213 goto err;
214 else
215 len = (size_t)readlen;
216 if (len == 0 && p == buf)
217 break;
218 end += len;
219 len = end - buf;
220 if (len < (ssize_t)sizeof(buf)) {
221 eof = 1;
222 if (len > 0 && buf[len -1] != '\n')
223 ++len, *end++ = '\n';
224 }
225 continue;
226 }
227
228 /* is it a blank line or a comment? */
229 for (r = p; r < q && isspace(*r); ++r)
230 /* nothing */;
231 if (r == q || *r == '#') {
232 /* yep */
233 if (write(tfd, p, q -p + 1) != q - p + 1)
234 goto err;
235 ++q;
236 continue;
237 }
238
239 /* is it the one we're looking for? */
240
241 t = *q;
242 *q = '\0';
243
244 fgr = gr_scan(r);
245
246 /* fgr is either a struct group for the current line,
247 * or NULL if the line is malformed.
248 */
249
250 *q = t;
251 if (fgr == NULL || fgr->gr_gid != sgr->gr_gid) {
252 /* nope */
253 if (fgr != NULL)
254 free(fgr);
255 if (write(tfd, p, q - p + 1) != q - p + 1)
256 goto err;
257 ++q;
258 continue;
259 }
260 if (old_gr && !gr_equal(fgr, old_gr)) {
261 warnx("entry inconsistent");
262 free(fgr);
263 errno = EINVAL; /* hack */
264 goto err;
265 }
266 free(fgr);
267
268 /* it is, replace or remove it */
269 if (line != NULL) {
270 len = strlen(line);
271 if (write(tfd, line, len) != (int) len)
272 goto err;
273 } else {
274 /* when removed, avoid the \n */
275 q++;
276 }
277 /* we're done, just copy the rest over */
278 for (;;) {
279 if (write(tfd, q, end - q) != end - q)
280 goto err;
281 q = buf;
282 readlen = read(ffd, buf, sizeof(buf));
283 if (readlen == 0)
284 break;
285 else
286 len = (size_t)readlen;
287 if (readlen == -1)
288 goto err;
289 end = buf + len;
290 }
291 goto done;
292 }
293
294 /* if we got here, we didn't find the old entry */
295 if (line == NULL) {
296 errno = ENOENT;
297 goto err;
298 }
299 len = strlen(line);
300 if ((size_t)write(tfd, line, len) != len ||
301 write(tfd, "\n", 1) != 1)
302 goto err;
303 done:
304 if (line != NULL)
305 free(line);
306 return (0);
307 err:
308 if (line != NULL)
309 free(line);
310 return (-1);
311}
312
313/*
314 * Regenerate the group file
315 */
316int
317gr_mkdb(void)
318{
319 if (chmod(tempname, 0644) != 0)
320 return (-1);
321
322 return (rename(tempname, group_file));
323}
324
325/*
326 * Clean up. Preserver errno for the caller's convenience.
327 */
328void
329gr_fini(void)
330{
331 int serrno;
332
333 if (!initialized)
334 return;
335 initialized = 0;
336 serrno = errno;
337 if (*tempname != '\0') {
338 unlink(tempname);
339 *tempname = '\0';
340 }
341 if (lockfd != -1)
342 close(lockfd);
343 errno = serrno;
344}
345
346/*
347 * Compares two struct group's.
348 */
349int
350gr_equal(const struct group *gr1, const struct group *gr2)
351{
352 int gr1_ndx;
353 int gr2_ndx;
354 bool found;
355
356 /* Check that the non-member information is the same. */
357 if (gr1->gr_name == NULL || gr2->gr_name == NULL) {
358 if (gr1->gr_name != gr2->gr_name)
359 return (false);
360 } else if (strcmp(gr1->gr_name, gr2->gr_name) != 0)
361 return (false);
362 if (gr1->gr_passwd == NULL || gr2->gr_passwd == NULL) {
363 if (gr1->gr_passwd != gr2->gr_passwd)
364 return (false);
365 } else if (strcmp(gr1->gr_passwd, gr2->gr_passwd) != 0)
366 return (false);
367 if (gr1->gr_gid != gr2->gr_gid)
368 return (false);
369
370 /* Check all members in both groups. */
371 if (gr1->gr_mem == NULL || gr2->gr_mem == NULL) {
372 if (gr1->gr_mem != gr2->gr_mem)
373 return (false);
374 } else {
375 for (found = false, gr1_ndx = 0; gr1->gr_mem[gr1_ndx] != NULL;
376 gr1_ndx++) {
377 for (gr2_ndx = 0; gr2->gr_mem[gr2_ndx] != NULL;
378 gr2_ndx++)
379 if (strcmp(gr1->gr_mem[gr1_ndx],
380 gr2->gr_mem[gr2_ndx]) == 0) {
381 found = true;
382 break;
383 }
384 if (!found)
385 return (false);
386 }
387
388 /* Check that group2 does not have more members than group1. */
389 if (gr2->gr_mem[gr1_ndx] != NULL)
390 return (false);
391 }
392
393 return (true);
394}
395
396/*
397 * Make a group line out of a struct group.
398 */
399char *
400gr_make(const struct group *gr)
401{
402 char *line;
403 size_t line_size;
404 int ndx;
405
406 /* Calculate the length of the group line. */
407 line_size = snprintf(NULL, 0, group_line_format, gr->gr_name,
408 gr->gr_passwd, (uintmax_t)gr->gr_gid) + 1;
409 if (gr->gr_mem != NULL) {
410 for (ndx = 0; gr->gr_mem[ndx] != NULL; ndx++)
411 line_size += strlen(gr->gr_mem[ndx]) + 1;
412 if (ndx > 0)
413 line_size--;
414 }
415
416 /* Create the group line and fill it. */
417 if ((line = malloc(line_size)) == NULL)
418 return (NULL);
419 snprintf(line, line_size, group_line_format, gr->gr_name, gr->gr_passwd,
420 (uintmax_t)gr->gr_gid);
421 if (gr->gr_mem != NULL)
422 for (ndx = 0; gr->gr_mem[ndx] != NULL; ndx++) {
423 strcat(line, gr->gr_mem[ndx]);
424 if (gr->gr_mem[ndx + 1] != NULL)
425 strcat(line, ",");
426 }
427
428 return (line);
429}
430
431/*
432 * Duplicate a struct group.
433 */
434struct group *
435gr_dup(const struct group *gr)
436{
437 char *dst;
438 size_t len;
439 struct group_storage *gs;
440 int ndx;
441 int num_mem;
442
443 /* Calculate size of the group. */
444 len = sizeof(*gs);
445 if (gr->gr_name != NULL)
446 len += strlen(gr->gr_name) + 1;
447 if (gr->gr_passwd != NULL)
448 len += strlen(gr->gr_passwd) + 1;
449 if (gr->gr_mem != NULL) {
450 for (num_mem = 0; gr->gr_mem[num_mem] != NULL; num_mem++)
451 len += strlen(gr->gr_mem[num_mem]) + 1;
452 len += (num_mem + 1) * sizeof(*gr->gr_mem);
453 } else
454 num_mem = -1;
455
456 /* Create new group and copy old group into it. */
457 if ((gs = calloc(1, len)) == NULL)
458 return (NULL);
459 dst = (char *)&gs->members[num_mem + 1];
460 if (gr->gr_name != NULL) {
461 gs->gr.gr_name = dst;
462 dst = stpcpy(gs->gr.gr_name, gr->gr_name) + 1;
463 }
464 if (gr->gr_passwd != NULL) {
465 gs->gr.gr_passwd = dst;
466 dst = stpcpy(gs->gr.gr_passwd, gr->gr_passwd) + 1;
467 }
468 gs->gr.gr_gid = gr->gr_gid;
469 if (gr->gr_mem != NULL) {
470 gs->gr.gr_mem = gs->members;
471 for (ndx = 0; ndx < num_mem; ndx++) {
472 gs->gr.gr_mem[ndx] = dst;
473 dst = stpcpy(gs->gr.gr_mem[ndx], gr->gr_mem[ndx]) + 1;
474 }
475 gs->gr.gr_mem[ndx] = NULL;
476 }
477
478 return (&gs->gr);
479}
480
481/*
482 * Scan a line and place it into a group structure.
483 */
484static bool
485__gr_scan(char *line, struct group *gr)
486{
487 char *loc;
488 int ndx;
489
490 /* Assign non-member information to structure. */
491 gr->gr_name = line;
492 if ((loc = strchr(line, ':')) == NULL)
493 return (false);
494 *loc = '\0';
495 gr->gr_passwd = loc + 1;
496 if (*gr->gr_passwd == ':')
497 *gr->gr_passwd = '\0';
498 else {
499 if ((loc = strchr(loc + 1, ':')) == NULL)
500 return (false);
501 *loc = '\0';
502 }
503 if (sscanf(loc + 1, "%u", &gr->gr_gid) != 1)
504 return (false);
505
506 /* Assign member information to structure. */
507 if ((loc = strchr(loc + 1, ':')) == NULL)
508 return (false);
509 line = loc + 1;
510 gr->gr_mem = NULL;
511 ndx = 0;
512 do {
513 gr->gr_mem = reallocf(gr->gr_mem, sizeof(*gr->gr_mem) *
514 (ndx + 1));
515 if (gr->gr_mem == NULL)
516 return (false);
517
518 /* Skip locations without members (i.e., empty string). */
519 do {
520 gr->gr_mem[ndx] = strsep(&line, ",");
521 } while (gr->gr_mem[ndx] != NULL && *gr->gr_mem[ndx] == '\0');
522 } while (gr->gr_mem[ndx++] != NULL);
523
524 return (true);
525}
526
527/*
528 * Create a struct group from a line.
529 */
530struct group *
531gr_scan(const char *line)
532{
533 struct group gr;
534 char *line_copy;
535 struct group *new_gr;
536
537 if ((line_copy = strdup(line)) == NULL)
538 return (NULL);
539 if (!__gr_scan(line_copy, &gr)) {
540 free(line_copy);
541 return (NULL);
542 }
543 new_gr = gr_dup(&gr);
544 free(line_copy);
545 if (gr.gr_mem != NULL)
546 free(gr.gr_mem);
547
548 return (new_gr);
549}