1 /*-
2 * Copyright (c) 1992 Keith Muller.
3 * Copyright (c) 1992, 1993
4 * The Regents of the University of California. All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * Keith Muller of the University of California, San Diego.
8 *
9 * %sccs.include.redist.c%
10 */
11
12 #ifndef lint
13 static char sccsid[] = "@(#)sel_subs.c 8.1 (Berkeley) 05/31/93";
14 #endif /* not lint */
15
16 #include <sys/types.h>
17 #include <sys/time.h>
18 #include <sys/stat.h>
19 #include <sys/param.h>
20 #include <pwd.h>
21 #include <grp.h>
22 #include <stdio.h>
23 #include <ctype.h>
24 #include <string.h>
25 #include <strings.h>
26 #include <unistd.h>
27 #include <stdlib.h>
28 #include "pax.h"
29 #include "sel_subs.h"
30 #include "extern.h"
31
32 static int str_sec __P((register char *, time_t *));
33 static int usr_match __P((register ARCHD *));
34 static int grp_match __P((register ARCHD *));
35 static int trng_match __P((register ARCHD *));
36
37 static TIME_RNG *trhead = NULL; /* time range list head */
38 static TIME_RNG *trtail = NULL; /* time range list tail */
39 static USRT **usrtb = NULL; /* user selection table */
40 static GRPT **grptb = NULL; /* group selection table */
41
42 /*
43 * Routines for selection of archive members
44 */
45
46 /*
47 * sel_chk()
48 * check if this file matches a specfied uid, gid or time range
49 * Return:
50 * 0 if this archive member should be processed, 1 if it should be skipped
51 */
52
53 #if __STDC__
54 int
sel_chk(register ARCHD * arcn)55 sel_chk(register ARCHD *arcn)
56 #else
57 int
58 sel_chk(arcn)
59 register ARCHD *arcn;
60 #endif
61 {
62 if (((usrtb != NULL) && usr_match(arcn)) ||
63 ((grptb != NULL) && grp_match(arcn)) ||
64 ((trhead != NULL) && trng_match(arcn)))
65 return(1);
66 return(0);
67 }
68
69 /*
70 * User/group selection routines
71 *
72 * Routines to handle user selection of files based on the file uid/gid. To
73 * add an entry, the user supplies either then name or the uid/gid starting with
74 * a # on the command line. A \# will eascape the #.
75 */
76
77 /*
78 * usr_add()
79 * add a user match to the user match hash table
80 * Return:
81 * 0 if added ok, -1 otherwise;
82 */
83
84 #if __STDC__
85 int
usr_add(register char * str)86 usr_add(register char *str)
87 #else
88 int
89 usr_add(str)
90 register char *str;
91 #endif
92 {
93 register u_int indx;
94 register USRT *pt;
95 register struct passwd *pw;
96 register uid_t uid;
97
98 /*
99 * create the table if it doesn't exist
100 */
101 if ((str == NULL) || (*str == '\0'))
102 return(-1);
103 if ((usrtb == NULL) &&
104 ((usrtb = (USRT **)calloc(USR_TB_SZ, sizeof(USRT *))) == NULL)) {
105 warn(1, "Unable to allocate memory for user selection table");
106 return(-1);
107 }
108
109 /*
110 * figure out user spec
111 */
112 if (str[0] != '#') {
113 /*
114 * it is a user name, \# escapes # as first char in user name
115 */
116 if ((str[0] == '\\') && (str[1] == '#'))
117 ++str;
118 if ((pw = getpwnam(str)) == NULL) {
119 warn(1, "Unable to find uid for user: %s", str);
120 return(-1);
121 }
122 uid = (uid_t)pw->pw_uid;
123 } else
124 # ifdef NET2_STAT
125 uid = (uid_t)atoi(str+1);
126 # else
127 uid = (uid_t)strtoul(str+1, (char **)NULL, 10);
128 # endif
129 endpwent();
130
131 /*
132 * hash it and go down the hash chain (if any) looking for it
133 */
134 indx = ((unsigned)uid) % USR_TB_SZ;
135 if ((pt = usrtb[indx]) != NULL) {
136 while (pt != NULL) {
137 if (pt->uid == uid)
138 return(0);
139 pt = pt->fow;
140 }
141 }
142
143 /*
144 * uid is not yet in the table, add it to the front of the chain
145 */
146 if ((pt = (USRT *)malloc(sizeof(USRT))) != NULL) {
147 pt->uid = uid;
148 pt->fow = usrtb[indx];
149 usrtb[indx] = pt;
150 return(0);
151 }
152 warn(1, "User selection table out of memory");
153 return(-1);
154 }
155
156 /*
157 * usr_match()
158 * check if this files uid matches a selected uid.
159 * Return:
160 * 0 if this archive member should be processed, 1 if it should be skipped
161 */
162
163 #if __STDC__
164 static int
usr_match(register ARCHD * arcn)165 usr_match(register ARCHD *arcn)
166 #else
167 static int
168 usr_match(arcn)
169 register ARCHD *arcn;
170 #endif
171 {
172 register USRT *pt;
173
174 /*
175 * hash and look for it in the table
176 */
177 pt = usrtb[((unsigned)arcn->sb.st_uid) % USR_TB_SZ];
178 while (pt != NULL) {
179 if (pt->uid == arcn->sb.st_uid)
180 return(0);
181 pt = pt->fow;
182 }
183
184 /*
185 * not found
186 */
187 return(1);
188 }
189
190 /*
191 * grp_add()
192 * add a group match to the group match hash table
193 * Return:
194 * 0 if added ok, -1 otherwise;
195 */
196
197 #if __STDC__
198 int
grp_add(register char * str)199 grp_add(register char *str)
200 #else
201 int
202 grp_add(str)
203 register char *str;
204 #endif
205 {
206 register u_int indx;
207 register GRPT *pt;
208 register struct group *gr;
209 register gid_t gid;
210
211 /*
212 * create the table if it doesn't exist
213 */
214 if ((str == NULL) || (*str == '\0'))
215 return(-1);
216 if ((grptb == NULL) &&
217 ((grptb = (GRPT **)calloc(GRP_TB_SZ, sizeof(GRPT *))) == NULL)) {
218 warn(1, "Unable to allocate memory fo group selection table");
219 return(-1);
220 }
221
222 /*
223 * figure out user spec
224 */
225 if (str[0] != '#') {
226 /*
227 * it is a group name, \# escapes # as first char in group name
228 */
229 if ((str[0] == '\\') && (str[1] == '#'))
230 ++str;
231 if ((gr = getgrnam(str)) == NULL) {
232 warn(1,"Cannot determine gid for group name: %s", str);
233 return(-1);
234 }
235 gid = (gid_t)gr->gr_gid;
236 } else
237 # ifdef NET2_STAT
238 gid = (gid_t)atoi(str+1);
239 # else
240 gid = (gid_t)strtoul(str+1, (char **)NULL, 10);
241 # endif
242 endgrent();
243
244 /*
245 * hash it and go down the hash chain (if any) looking for it
246 */
247 indx = ((unsigned)gid) % GRP_TB_SZ;
248 if ((pt = grptb[indx]) != NULL) {
249 while (pt != NULL) {
250 if (pt->gid == gid)
251 return(0);
252 pt = pt->fow;
253 }
254 }
255
256 /*
257 * gid not in the table, add it to the front of the chain
258 */
259 if ((pt = (GRPT *)malloc(sizeof(GRPT))) != NULL) {
260 pt->gid = gid;
261 pt->fow = grptb[indx];
262 grptb[indx] = pt;
263 return(0);
264 }
265 warn(1, "Group selection table out of memory");
266 return(-1);
267 }
268
269 /*
270 * grp_match()
271 * check if this files gid matches a selected gid.
272 * Return:
273 * 0 if this archive member should be processed, 1 if it should be skipped
274 */
275
276 #if __STDC__
277 static int
grp_match(register ARCHD * arcn)278 grp_match(register ARCHD *arcn)
279 #else
280 static int
281 grp_match(arcn)
282 register ARCHD *arcn;
283 #endif
284 {
285 register GRPT *pt;
286
287 /*
288 * hash and look for it in the table
289 */
290 pt = grptb[((unsigned)arcn->sb.st_gid) % GRP_TB_SZ];
291 while (pt != NULL) {
292 if (pt->gid == arcn->sb.st_gid)
293 return(0);
294 pt = pt->fow;
295 }
296
297 /*
298 * not found
299 */
300 return(1);
301 }
302
303 /*
304 * Time range selection routines
305 *
306 * Routines to handle user selection of files based on the modification and/or
307 * inode change time falling within a specified time range (the non-standard
308 * -T flag). The user may specify any number of different file time ranges.
309 * Time ranges are checked one at a time until a match is found (if at all).
310 * If the file has a mtime (and/or ctime) which lies within one of the time
311 * ranges, the file is selected. Time ranges may have a lower and/or a upper
312 * value. These ranges are inclusive. When no time ranges are supplied to pax
313 * with the -T option, all members in the archive will be selected by the time
314 * range routines. When only a lower range is supplied, only files with a
315 * mtime (and/or ctime) equal to or younger are selected. When only a upper
316 * range is supplied, only files with a mtime (and/or ctime) equal to or older
317 * are selected. When the lower time range is equal to the upper time range,
318 * only files with a mtime (or ctime) of exactly that time are selected.
319 */
320
321 /*
322 * trng_add()
323 * add a time range match to the time range list.
324 * This is a non-standard pax option. Lower and upper ranges are in the
325 * format: [yy[mm[dd[hh]]]]mm[.ss] and are comma separated.
326 * Time ranges are based on current time, so 1234 would specify a time of
327 * 12:34 today.
328 * Return:
329 * 0 if the time range was added to the list, -1 otherwise
330 */
331
332 #if __STDC__
333 int
trng_add(register char * str)334 trng_add(register char *str)
335 #else
336 int
337 trng_add(str)
338 register char *str;
339 #endif
340 {
341 register TIME_RNG *pt;
342 register char *up_pt = NULL;
343 register char *stpt;
344 register char *flgpt;
345 register int dot = 0;
346
347 /*
348 * throw out the badly formed time ranges
349 */
350 if ((str == NULL) || (*str == '\0')) {
351 warn(1, "Empty time range string");
352 return(-1);
353 }
354
355 /*
356 * locate optional flags suffix /{cm}.
357 */
358 if ((flgpt = rindex(str, '/')) != NULL)
359 *flgpt++ = '\0';
360
361 for (stpt = str; *stpt != '\0'; ++stpt) {
362 if ((*stpt >= '0') && (*stpt <= '9'))
363 continue;
364 if ((*stpt == ',') && (up_pt == NULL)) {
365 *stpt = '\0';
366 up_pt = stpt + 1;
367 dot = 0;
368 continue;
369 }
370
371 /*
372 * allow only one dot per range (secs)
373 */
374 if ((*stpt == '.') && (!dot)) {
375 ++dot;
376 continue;
377 }
378 warn(1, "Improperly specified time range: %s", str);
379 goto out;
380 }
381
382 /*
383 * allocate space for the time range and store the limits
384 */
385 if ((pt = (TIME_RNG *)malloc(sizeof(TIME_RNG))) == NULL) {
386 warn(1, "Unable to allocate memory for time range");
387 return(-1);
388 }
389
390 /*
391 * by default we only will check file mtime, but usee can specify
392 * mtime, ctime (inode change time) or both.
393 */
394 if ((flgpt == NULL) || (*flgpt == '\0'))
395 pt->flgs = CMPMTME;
396 else {
397 pt->flgs = 0;
398 while (*flgpt != '\0') {
399 switch(*flgpt) {
400 case 'M':
401 case 'm':
402 pt->flgs |= CMPMTME;
403 break;
404 case 'C':
405 case 'c':
406 pt->flgs |= CMPCTME;
407 break;
408 default:
409 warn(1, "Bad option %c with time range %s",
410 *flgpt, str);
411 goto out;
412 }
413 ++flgpt;
414 }
415 }
416
417 /*
418 * start off with the current time
419 */
420 pt->low_time = pt->high_time = time((time_t *)NULL);
421 if (*str != '\0') {
422 /*
423 * add lower limit
424 */
425 if (str_sec(str, &(pt->low_time)) < 0) {
426 warn(1, "Illegal lower time range %s", str);
427 (void)free((char *)pt);
428 goto out;
429 }
430 pt->flgs |= HASLOW;
431 }
432
433 if ((up_pt != NULL) && (*up_pt != '\0')) {
434 /*
435 * add upper limit
436 */
437 if (str_sec(up_pt, &(pt->high_time)) < 0) {
438 warn(1, "Illegal upper time range %s", up_pt);
439 (void)free((char *)pt);
440 goto out;
441 }
442 pt->flgs |= HASHIGH;
443
444 /*
445 * check that the upper and lower do not overlap
446 */
447 if (pt->flgs & HASLOW) {
448 if (pt->low_time > pt->high_time) {
449 warn(1, "Upper %s and lower %s time overlap",
450 up_pt, str);
451 (void)free((char *)pt);
452 return(-1);
453 }
454 }
455 }
456
457 pt->fow = NULL;
458 if (trhead == NULL) {
459 trtail = trhead = pt;
460 return(0);
461 }
462 trtail->fow = pt;
463 trtail = pt;
464 return(0);
465
466 out:
467 warn(1, "Time range format is: [yy[mm[dd[hh]]]]mm[.ss][/[c][m]]");
468 return(-1);
469 }
470
471 /*
472 * trng_match()
473 * check if this files mtime/ctime falls within any supplied time range.
474 * Return:
475 * 0 if this archive member should be processed, 1 if it should be skipped
476 */
477
478 #if __STDC__
479 static int
trng_match(register ARCHD * arcn)480 trng_match(register ARCHD *arcn)
481 #else
482 static int
483 trng_match(arcn)
484 register ARCHD *arcn;
485 #endif
486 {
487 register TIME_RNG *pt;
488
489 /*
490 * have to search down the list one at a time looking for a match.
491 * remember time range limits are inclusive.
492 */
493 pt = trhead;
494 while (pt != NULL) {
495 switch(pt->flgs & CMPBOTH) {
496 case CMPBOTH:
497 /*
498 * user wants both mtime and ctime checked for this
499 * time range
500 */
501 if (((pt->flgs & HASLOW) &&
502 (arcn->sb.st_mtime < pt->low_time) &&
503 (arcn->sb.st_ctime < pt->low_time)) ||
504 ((pt->flgs & HASHIGH) &&
505 (arcn->sb.st_mtime > pt->high_time) &&
506 (arcn->sb.st_ctime > pt->high_time))) {
507 pt = pt->fow;
508 continue;
509 }
510 break;
511 case CMPCTME:
512 /*
513 * user wants only ctime checked for this time range
514 */
515 if (((pt->flgs & HASLOW) &&
516 (arcn->sb.st_ctime < pt->low_time)) ||
517 ((pt->flgs & HASHIGH) &&
518 (arcn->sb.st_ctime > pt->high_time))) {
519 pt = pt->fow;
520 continue;
521 }
522 break;
523 case CMPMTME:
524 default:
525 /*
526 * user wants only mtime checked for this time range
527 */
528 if (((pt->flgs & HASLOW) &&
529 (arcn->sb.st_mtime < pt->low_time)) ||
530 ((pt->flgs & HASHIGH) &&
531 (arcn->sb.st_mtime > pt->high_time))) {
532 pt = pt->fow;
533 continue;
534 }
535 break;
536 }
537 break;
538 }
539
540 if (pt == NULL)
541 return(1);
542 return(0);
543 }
544
545 /*
546 * str_sec()
547 * Convert a time string in the format of [yy[mm[dd[hh]]]]mm[.ss] to gmt
548 * seconds. Tval already has current time loaded into it at entry.
549 * Return:
550 * 0 if converted ok, -1 otherwise
551 */
552
553 #if __STDC__
554 static int
str_sec(register char * str,time_t * tval)555 str_sec(register char *str, time_t *tval)
556 #else
557 static int
558 str_sec(str, tval)
559 register char *str;
560 time_t *tval;
561 #endif
562 {
563 register struct tm *lt;
564 register char *dot = NULL;
565
566 lt = localtime(tval);
567 if ((dot = index(str, '.')) != NULL) {
568 /*
569 * seconds (.ss)
570 */
571 *dot++ = '\0';
572 if (strlen(dot) != 2)
573 return(-1);
574 if ((lt->tm_sec = ATOI2(dot)) > 61)
575 return(-1);
576 } else
577 lt->tm_sec = 0;
578
579 switch (strlen(str)) {
580 case 10:
581 /*
582 * year (yy)
583 * watch out for year 2000
584 */
585 if ((lt->tm_year = ATOI2(str)) < 69)
586 lt->tm_year += 100;
587 str += 2;
588 /* FALLTHROUGH */
589 case 8:
590 /*
591 * month (mm)
592 * watch out months are from 0 - 11 internally
593 */
594 if ((lt->tm_mon = ATOI2(str)) > 12)
595 return(-1);
596 --lt->tm_mon;
597 str += 2;
598 /* FALLTHROUGH */
599 case 6:
600 /*
601 * day (dd)
602 */
603 if ((lt->tm_mday = ATOI2(str)) > 31)
604 return(-1);
605 str += 2;
606 /* FALLTHROUGH */
607 case 4:
608 /*
609 * hour (hh)
610 */
611 if ((lt->tm_hour = ATOI2(str)) > 23)
612 return(-1);
613 str += 2;
614 /* FALLTHROUGH */
615 case 2:
616 /*
617 * minute (mm)
618 */
619 if ((lt->tm_min = ATOI2(str)) > 59)
620 return(-1);
621 break;
622 default:
623 return(-1);
624 }
625 /*
626 * convert broken-down time to GMT clock time seconds
627 */
628 if ((*tval = mktime(lt)) == -1)
629 return(-1);
630 return(0);
631 }
632