1 /*
2 * The filter include/exclude routines.
3 *
4 * Copyright (C) 1996-2001 Andrew Tridgell <tridge@samba.org>
5 * Copyright (C) 1996 Paul Mackerras
6 * Copyright (C) 2002 Martin Pool
7 * Copyright (C) 2003-2020 Wayne Davison
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 3 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, visit the http://fsf.org website.
21 */
22
23 #include "rsync.h"
24 #include "ifuncs.h"
25
26 extern int am_server;
27 extern int am_sender;
28 extern int eol_nulls;
29 extern int io_error;
30 extern int local_server;
31 extern int prune_empty_dirs;
32 extern int ignore_perishable;
33 extern int delete_mode;
34 extern int delete_excluded;
35 extern int cvs_exclude;
36 extern int sanitize_paths;
37 extern int protocol_version;
38 extern int module_id;
39
40 extern char curr_dir[MAXPATHLEN];
41 extern unsigned int curr_dir_len;
42 extern unsigned int module_dirlen;
43
44 filter_rule_list filter_list = { .debug_type = "" };
45 filter_rule_list cvs_filter_list = { .debug_type = " [global CVS]" };
46 filter_rule_list daemon_filter_list = { .debug_type = " [daemon]" };
47
48 int saw_xattr_filter = 0;
49
50 /* Need room enough for ":MODS " prefix plus some room to grow. */
51 #define MAX_RULE_PREFIX (16)
52
53 #define SLASH_WILD3_SUFFIX "/***"
54
55 /* The dirbuf is set by push_local_filters() to the current subdirectory
56 * relative to curr_dir that is being processed. The path always has a
57 * trailing slash appended, and the variable dirbuf_len contains the length
58 * of this path prefix. The path is always absolute. */
59 static char dirbuf[MAXPATHLEN+1];
60 static unsigned int dirbuf_len = 0;
61 static int dirbuf_depth;
62
63 /* This is True when we're scanning parent dirs for per-dir merge-files. */
64 static BOOL parent_dirscan = False;
65
66 /* This array contains a list of all the currently active per-dir merge
67 * files. This makes it easier to save the appropriate values when we
68 * "push" down into each subdirectory. */
69 static filter_rule **mergelist_parents;
70 static int mergelist_cnt = 0;
71 static int mergelist_size = 0;
72
73 /* Each filter_list_struct describes a singly-linked list by keeping track
74 * of both the head and tail pointers. The list is slightly unusual in that
75 * a parent-dir's content can be appended to the end of the local list in a
76 * special way: the last item in the local list has its "next" pointer set
77 * to point to the inherited list, but the local list's tail pointer points
78 * at the end of the local list. Thus, if the local list is empty, the head
79 * will be pointing at the inherited content but the tail will be NULL. To
80 * help you visualize this, here are the possible list arrangements:
81 *
82 * Completely Empty Local Content Only
83 * ================================== ====================================
84 * head -> NULL head -> Local1 -> Local2 -> NULL
85 * tail -> NULL tail -------------^
86 *
87 * Inherited Content Only Both Local and Inherited Content
88 * ================================== ====================================
89 * head -> Parent1 -> Parent2 -> NULL head -> L1 -> L2 -> P1 -> P2 -> NULL
90 * tail -> NULL tail ---------^
91 *
92 * This means that anyone wanting to traverse the whole list to use it just
93 * needs to start at the head and use the "next" pointers until it goes
94 * NULL. To add new local content, we insert the item after the tail item
95 * and update the tail (obviously, if "tail" was NULL, we insert it at the
96 * head). To clear the local list, WE MUST NOT FREE THE INHERITED CONTENT
97 * because it is shared between the current list and our parent list(s).
98 * The easiest way to handle this is to simply truncate the list after the
99 * tail item and then free the local list from the head. When inheriting
100 * the list for a new local dir, we just save off the filter_list_struct
101 * values (so we can pop back to them later) and set the tail to NULL.
102 */
103
teardown_mergelist(filter_rule * ex)104 static void teardown_mergelist(filter_rule *ex)
105 {
106 int j;
107
108 if (!ex->u.mergelist)
109 return;
110
111 if (DEBUG_GTE(FILTER, 2)) {
112 rprintf(FINFO, "[%s] deactivating mergelist #%d%s\n",
113 who_am_i(), mergelist_cnt - 1,
114 ex->u.mergelist->debug_type);
115 }
116
117 free(ex->u.mergelist->debug_type);
118 free(ex->u.mergelist);
119
120 for (j = 0; j < mergelist_cnt; j++) {
121 if (mergelist_parents[j] == ex) {
122 mergelist_parents[j] = NULL;
123 break;
124 }
125 }
126 while (mergelist_cnt && mergelist_parents[mergelist_cnt-1] == NULL)
127 mergelist_cnt--;
128 }
129
free_filter(filter_rule * ex)130 static void free_filter(filter_rule *ex)
131 {
132 if (ex->rflags & FILTRULE_PERDIR_MERGE)
133 teardown_mergelist(ex);
134 free(ex->pattern);
135 free(ex);
136 }
137
free_filters(filter_rule * ent)138 static void free_filters(filter_rule *ent)
139 {
140 while (ent) {
141 filter_rule *next = ent->next;
142 free_filter(ent);
143 ent = next;
144 }
145 }
146
147 /* Build a filter structure given a filter pattern. The value in "pat"
148 * is not null-terminated. "rule" is either held or freed, so the
149 * caller should not free it. */
add_rule(filter_rule_list * listp,const char * pat,unsigned int pat_len,filter_rule * rule,int xflags)150 static void add_rule(filter_rule_list *listp, const char *pat, unsigned int pat_len,
151 filter_rule *rule, int xflags)
152 {
153 const char *cp;
154 unsigned int pre_len, suf_len, slash_cnt = 0;
155
156 if (DEBUG_GTE(FILTER, 2)) {
157 rprintf(FINFO, "[%s] add_rule(%s%.*s%s)%s\n",
158 who_am_i(), get_rule_prefix(rule, pat, 0, NULL),
159 (int)pat_len, pat,
160 (rule->rflags & FILTRULE_DIRECTORY) ? "/" : "",
161 listp->debug_type);
162 }
163
164 /* These flags also indicate that we're reading a list that
165 * needs to be filtered now, not post-filtered later. */
166 if (xflags & (XFLG_ANCHORED2ABS|XFLG_ABS_IF_SLASH)
167 && (rule->rflags & FILTRULES_SIDES)
168 == (am_sender ? FILTRULE_RECEIVER_SIDE : FILTRULE_SENDER_SIDE)) {
169 /* This filter applies only to the other side. Drop it. */
170 free_filter(rule);
171 return;
172 }
173
174 if (pat_len > 1 && pat[pat_len-1] == '/') {
175 pat_len--;
176 rule->rflags |= FILTRULE_DIRECTORY;
177 }
178
179 for (cp = pat; cp < pat + pat_len; cp++) {
180 if (*cp == '/')
181 slash_cnt++;
182 }
183
184 if (!(rule->rflags & (FILTRULE_ABS_PATH | FILTRULE_MERGE_FILE))
185 && ((xflags & (XFLG_ANCHORED2ABS|XFLG_ABS_IF_SLASH) && *pat == '/')
186 || (xflags & XFLG_ABS_IF_SLASH && slash_cnt))) {
187 rule->rflags |= FILTRULE_ABS_PATH;
188 if (*pat == '/')
189 pre_len = dirbuf_len - module_dirlen - 1;
190 else
191 pre_len = 0;
192 } else
193 pre_len = 0;
194
195 /* The daemon wants dir-exclude rules to get an appended "/" + "***". */
196 if (xflags & XFLG_DIR2WILD3
197 && BITS_SETnUNSET(rule->rflags, FILTRULE_DIRECTORY, FILTRULE_INCLUDE)) {
198 rule->rflags &= ~FILTRULE_DIRECTORY;
199 suf_len = sizeof SLASH_WILD3_SUFFIX - 1;
200 } else
201 suf_len = 0;
202
203 rule->pattern = new_array(char, pre_len + pat_len + suf_len + 1);
204 if (pre_len) {
205 memcpy(rule->pattern, dirbuf + module_dirlen, pre_len);
206 for (cp = rule->pattern; cp < rule->pattern + pre_len; cp++) {
207 if (*cp == '/')
208 slash_cnt++;
209 }
210 }
211 strlcpy(rule->pattern + pre_len, pat, pat_len + 1);
212 pat_len += pre_len;
213 if (suf_len) {
214 memcpy(rule->pattern + pat_len, SLASH_WILD3_SUFFIX, suf_len+1);
215 pat_len += suf_len;
216 slash_cnt++;
217 }
218
219 if (strpbrk(rule->pattern, "*[?")) {
220 rule->rflags |= FILTRULE_WILD;
221 if ((cp = strstr(rule->pattern, "**")) != NULL) {
222 rule->rflags |= FILTRULE_WILD2;
223 /* If the pattern starts with **, note that. */
224 if (cp == rule->pattern)
225 rule->rflags |= FILTRULE_WILD2_PREFIX;
226 /* If the pattern ends with ***, note that. */
227 if (pat_len >= 3
228 && rule->pattern[pat_len-3] == '*'
229 && rule->pattern[pat_len-2] == '*'
230 && rule->pattern[pat_len-1] == '*')
231 rule->rflags |= FILTRULE_WILD3_SUFFIX;
232 }
233 }
234
235 if (rule->rflags & FILTRULE_PERDIR_MERGE) {
236 filter_rule_list *lp;
237 unsigned int len;
238 int i;
239
240 if ((cp = strrchr(rule->pattern, '/')) != NULL)
241 cp++;
242 else
243 cp = rule->pattern;
244
245 /* If the local merge file was already mentioned, don't
246 * add it again. */
247 for (i = 0; i < mergelist_cnt; i++) {
248 filter_rule *ex = mergelist_parents[i];
249 const char *s;
250 if (!ex)
251 continue;
252 s = strrchr(ex->pattern, '/');
253 if (s)
254 s++;
255 else
256 s = ex->pattern;
257 len = strlen(s);
258 if (len == pat_len - (cp - rule->pattern) && memcmp(s, cp, len) == 0) {
259 free_filter(rule);
260 return;
261 }
262 }
263
264 lp = new_array0(filter_rule_list, 1);
265 if (asprintf(&lp->debug_type, " [per-dir %s]", cp) < 0)
266 out_of_memory("add_rule");
267 rule->u.mergelist = lp;
268
269 if (mergelist_cnt == mergelist_size) {
270 mergelist_size += 5;
271 mergelist_parents = realloc_array(mergelist_parents, filter_rule *, mergelist_size);
272 }
273 if (DEBUG_GTE(FILTER, 2)) {
274 rprintf(FINFO, "[%s] activating mergelist #%d%s\n",
275 who_am_i(), mergelist_cnt, lp->debug_type);
276 }
277 mergelist_parents[mergelist_cnt++] = rule;
278 } else
279 rule->u.slash_cnt = slash_cnt;
280
281 if (!listp->tail) {
282 rule->next = listp->head;
283 listp->head = listp->tail = rule;
284 } else {
285 rule->next = listp->tail->next;
286 listp->tail->next = rule;
287 listp->tail = rule;
288 }
289 }
290
291 /* This frees any non-inherited items, leaving just inherited items on the list. */
pop_filter_list(filter_rule_list * listp)292 static void pop_filter_list(filter_rule_list *listp)
293 {
294 filter_rule *inherited;
295
296 if (!listp->tail)
297 return;
298
299 inherited = listp->tail->next;
300
301 /* Truncate any inherited items from the local list. */
302 listp->tail->next = NULL;
303 /* Now free everything that is left. */
304 free_filters(listp->head);
305
306 listp->head = inherited;
307 listp->tail = NULL;
308 }
309
310 /* This returns an expanded (absolute) filename for the merge-file name if
311 * the name has any slashes in it OR if the parent_dirscan var is True;
312 * otherwise it returns the original merge_file name. If the len_ptr value
313 * is non-NULL the merge_file name is limited by the referenced length
314 * value and will be updated with the length of the resulting name. We
315 * always return a name that is null terminated, even if the merge_file
316 * name was not. */
parse_merge_name(const char * merge_file,unsigned int * len_ptr,unsigned int prefix_skip)317 static char *parse_merge_name(const char *merge_file, unsigned int *len_ptr,
318 unsigned int prefix_skip)
319 {
320 static char buf[MAXPATHLEN];
321 char *fn, tmpbuf[MAXPATHLEN];
322 unsigned int fn_len;
323
324 if (!parent_dirscan && *merge_file != '/') {
325 /* Return the name unchanged it doesn't have any slashes. */
326 if (len_ptr) {
327 const char *p = merge_file + *len_ptr;
328 while (--p > merge_file && *p != '/') {}
329 if (p == merge_file) {
330 strlcpy(buf, merge_file, *len_ptr + 1);
331 return buf;
332 }
333 } else if (strchr(merge_file, '/') == NULL)
334 return (char *)merge_file;
335 }
336
337 fn = *merge_file == '/' ? buf : tmpbuf;
338 if (sanitize_paths) {
339 const char *r = prefix_skip ? "/" : NULL;
340 /* null-terminate the name if it isn't already */
341 if (len_ptr && merge_file[*len_ptr]) {
342 char *to = fn == buf ? tmpbuf : buf;
343 strlcpy(to, merge_file, *len_ptr + 1);
344 merge_file = to;
345 }
346 if (!sanitize_path(fn, merge_file, r, dirbuf_depth, SP_DEFAULT)) {
347 rprintf(FERROR, "merge-file name overflows: %s\n",
348 merge_file);
349 return NULL;
350 }
351 fn_len = strlen(fn);
352 } else {
353 strlcpy(fn, merge_file, len_ptr ? *len_ptr + 1 : MAXPATHLEN);
354 fn_len = clean_fname(fn, CFN_COLLAPSE_DOT_DOT_DIRS);
355 }
356
357 /* If the name isn't in buf yet, it wasn't absolute. */
358 if (fn != buf) {
359 int d_len = dirbuf_len - prefix_skip;
360 if (d_len + fn_len >= MAXPATHLEN) {
361 rprintf(FERROR, "merge-file name overflows: %s\n", fn);
362 return NULL;
363 }
364 memcpy(buf, dirbuf + prefix_skip, d_len);
365 memcpy(buf + d_len, fn, fn_len + 1);
366 fn_len = clean_fname(buf, CFN_COLLAPSE_DOT_DOT_DIRS);
367 }
368
369 if (len_ptr)
370 *len_ptr = fn_len;
371 return buf;
372 }
373
374 /* Sets the dirbuf and dirbuf_len values. */
set_filter_dir(const char * dir,unsigned int dirlen)375 void set_filter_dir(const char *dir, unsigned int dirlen)
376 {
377 unsigned int len;
378 if (*dir != '/') {
379 memcpy(dirbuf, curr_dir, curr_dir_len);
380 dirbuf[curr_dir_len] = '/';
381 len = curr_dir_len + 1;
382 if (len + dirlen >= MAXPATHLEN)
383 dirlen = 0;
384 } else
385 len = 0;
386 memcpy(dirbuf + len, dir, dirlen);
387 dirbuf[dirlen + len] = '\0';
388 dirbuf_len = clean_fname(dirbuf, CFN_COLLAPSE_DOT_DOT_DIRS);
389 if (dirbuf_len > 1 && dirbuf[dirbuf_len-1] == '.'
390 && dirbuf[dirbuf_len-2] == '/')
391 dirbuf_len -= 2;
392 if (dirbuf_len != 1)
393 dirbuf[dirbuf_len++] = '/';
394 dirbuf[dirbuf_len] = '\0';
395 if (sanitize_paths)
396 dirbuf_depth = count_dir_elements(dirbuf + module_dirlen);
397 }
398
399 /* This routine takes a per-dir merge-file entry and finishes its setup.
400 * If the name has a path portion then we check to see if it refers to a
401 * parent directory of the first transfer dir. If it does, we scan all the
402 * dirs from that point through the parent dir of the transfer dir looking
403 * for the per-dir merge-file in each one. */
setup_merge_file(int mergelist_num,filter_rule * ex,filter_rule_list * lp)404 static BOOL setup_merge_file(int mergelist_num, filter_rule *ex,
405 filter_rule_list *lp)
406 {
407 char buf[MAXPATHLEN];
408 char *x, *y, *pat = ex->pattern;
409 unsigned int len;
410
411 if (!(x = parse_merge_name(pat, NULL, 0)) || *x != '/')
412 return 0;
413
414 if (DEBUG_GTE(FILTER, 2)) {
415 rprintf(FINFO, "[%s] performing parent_dirscan for mergelist #%d%s\n",
416 who_am_i(), mergelist_num, lp->debug_type);
417 }
418 y = strrchr(x, '/');
419 *y = '\0';
420 ex->pattern = strdup(y+1);
421 if (!*x)
422 x = "/";
423 if (*x == '/')
424 strlcpy(buf, x, MAXPATHLEN);
425 else
426 pathjoin(buf, MAXPATHLEN, dirbuf, x);
427
428 len = clean_fname(buf, CFN_COLLAPSE_DOT_DOT_DIRS);
429 if (len != 1 && len < MAXPATHLEN-1) {
430 buf[len++] = '/';
431 buf[len] = '\0';
432 }
433 /* This ensures that the specified dir is a parent of the transfer. */
434 for (x = buf, y = dirbuf; *x && *x == *y; x++, y++) {}
435 if (*x)
436 y += strlen(y); /* nope -- skip the scan */
437
438 parent_dirscan = True;
439 while (*y) {
440 char save[MAXPATHLEN];
441 strlcpy(save, y, MAXPATHLEN);
442 *y = '\0';
443 dirbuf_len = y - dirbuf;
444 strlcpy(x, ex->pattern, MAXPATHLEN - (x - buf));
445 parse_filter_file(lp, buf, ex, XFLG_ANCHORED2ABS);
446 if (ex->rflags & FILTRULE_NO_INHERIT) {
447 /* Free the undesired rules to clean up any per-dir
448 * mergelists they defined. Otherwise pop_local_filters
449 * may crash trying to restore nonexistent state for
450 * those mergelists. */
451 free_filters(lp->head);
452 lp->head = NULL;
453 }
454 lp->tail = NULL;
455 strlcpy(y, save, MAXPATHLEN);
456 while ((*x++ = *y++) != '/') {}
457 }
458 parent_dirscan = False;
459 if (DEBUG_GTE(FILTER, 2)) {
460 rprintf(FINFO, "[%s] completed parent_dirscan for mergelist #%d%s\n",
461 who_am_i(), mergelist_num, lp->debug_type);
462 }
463 free(pat);
464 return 1;
465 }
466
467 struct local_filter_state {
468 int mergelist_cnt;
469 filter_rule_list mergelists[1];
470 };
471
472 /* Each time rsync changes to a new directory it call this function to
473 * handle all the per-dir merge-files. The "dir" value is the current path
474 * relative to curr_dir (which might not be null-terminated). We copy it
475 * into dirbuf so that we can easily append a file name on the end. */
push_local_filters(const char * dir,unsigned int dirlen)476 void *push_local_filters(const char *dir, unsigned int dirlen)
477 {
478 struct local_filter_state *push;
479 int i;
480
481 set_filter_dir(dir, dirlen);
482 if (DEBUG_GTE(FILTER, 2)) {
483 rprintf(FINFO, "[%s] pushing local filters for %s\n",
484 who_am_i(), dirbuf);
485 }
486
487 if (!mergelist_cnt) {
488 /* No old state to save and no new merge files to push. */
489 return NULL;
490 }
491
492 push = (struct local_filter_state *)new_array(char,
493 sizeof (struct local_filter_state)
494 + (mergelist_cnt-1) * sizeof (filter_rule_list));
495
496 push->mergelist_cnt = mergelist_cnt;
497 for (i = 0; i < mergelist_cnt; i++) {
498 filter_rule *ex = mergelist_parents[i];
499 if (!ex)
500 continue;
501 memcpy(&push->mergelists[i], ex->u.mergelist, sizeof (filter_rule_list));
502 }
503
504 /* Note: parse_filter_file() might increase mergelist_cnt, so keep
505 * this loop separate from the above loop. */
506 for (i = 0; i < mergelist_cnt; i++) {
507 filter_rule *ex = mergelist_parents[i];
508 filter_rule_list *lp;
509 if (!ex)
510 continue;
511 lp = ex->u.mergelist;
512
513 if (DEBUG_GTE(FILTER, 2)) {
514 rprintf(FINFO, "[%s] pushing mergelist #%d%s\n",
515 who_am_i(), i, lp->debug_type);
516 }
517
518 lp->tail = NULL; /* Switch any local rules to inherited. */
519 if (ex->rflags & FILTRULE_NO_INHERIT)
520 lp->head = NULL;
521
522 if (ex->rflags & FILTRULE_FINISH_SETUP) {
523 ex->rflags &= ~FILTRULE_FINISH_SETUP;
524 if (setup_merge_file(i, ex, lp))
525 set_filter_dir(dir, dirlen);
526 }
527
528 if (strlcpy(dirbuf + dirbuf_len, ex->pattern,
529 MAXPATHLEN - dirbuf_len) < MAXPATHLEN - dirbuf_len) {
530 parse_filter_file(lp, dirbuf, ex,
531 XFLG_ANCHORED2ABS);
532 } else {
533 io_error |= IOERR_GENERAL;
534 rprintf(FERROR,
535 "cannot add local filter rules in long-named directory: %s\n",
536 full_fname(dirbuf));
537 }
538 dirbuf[dirbuf_len] = '\0';
539 }
540
541 return (void*)push;
542 }
543
pop_local_filters(void * mem)544 void pop_local_filters(void *mem)
545 {
546 struct local_filter_state *pop = (struct local_filter_state *)mem;
547 int i;
548 int old_mergelist_cnt = pop ? pop->mergelist_cnt : 0;
549
550 if (DEBUG_GTE(FILTER, 2))
551 rprintf(FINFO, "[%s] popping local filters\n", who_am_i());
552
553 for (i = mergelist_cnt; i-- > 0; ) {
554 filter_rule *ex = mergelist_parents[i];
555 filter_rule_list *lp;
556 if (!ex)
557 continue;
558 lp = ex->u.mergelist;
559
560 if (DEBUG_GTE(FILTER, 2)) {
561 rprintf(FINFO, "[%s] popping mergelist #%d%s\n",
562 who_am_i(), i, lp->debug_type);
563 }
564
565 pop_filter_list(lp);
566 if (i >= old_mergelist_cnt && lp->head) {
567 /* This mergelist does not exist in the state to be restored, but it
568 * still has inherited rules. This can sometimes happen if a per-dir
569 * merge file calls setup_merge_file() in push_local_filters() and that
570 * leaves some inherited rules that aren't in the pushed list state. */
571 if (DEBUG_GTE(FILTER, 2)) {
572 rprintf(FINFO, "[%s] freeing parent_dirscan filters of mergelist #%d%s\n",
573 who_am_i(), i, ex->u.mergelist->debug_type);
574 }
575 pop_filter_list(lp);
576 }
577 }
578
579 if (!pop)
580 return; /* No state to restore. */
581
582 for (i = 0; i < old_mergelist_cnt; i++) {
583 filter_rule *ex = mergelist_parents[i];
584 if (!ex)
585 continue;
586 memcpy(ex->u.mergelist, &pop->mergelists[i], sizeof (filter_rule_list));
587 }
588
589 free(pop);
590 }
591
change_local_filter_dir(const char * dname,int dlen,int dir_depth)592 void change_local_filter_dir(const char *dname, int dlen, int dir_depth)
593 {
594 static int cur_depth = -1;
595 static void *filt_array[MAXPATHLEN/2+1];
596
597 if (!dname) {
598 for ( ; cur_depth >= 0; cur_depth--) {
599 if (filt_array[cur_depth]) {
600 pop_local_filters(filt_array[cur_depth]);
601 filt_array[cur_depth] = NULL;
602 }
603 }
604 return;
605 }
606
607 assert(dir_depth < MAXPATHLEN/2+1);
608
609 for ( ; cur_depth >= dir_depth; cur_depth--) {
610 if (filt_array[cur_depth]) {
611 pop_local_filters(filt_array[cur_depth]);
612 filt_array[cur_depth] = NULL;
613 }
614 }
615
616 cur_depth = dir_depth;
617 filt_array[cur_depth] = push_local_filters(dname, dlen);
618 }
619
rule_matches(const char * fname,filter_rule * ex,int name_flags)620 static int rule_matches(const char *fname, filter_rule *ex, int name_flags)
621 {
622 int slash_handling, str_cnt = 0, anchored_match = 0;
623 int ret_match = ex->rflags & FILTRULE_NEGATE ? 0 : 1;
624 char *p, *pattern = ex->pattern;
625 const char *strings[16]; /* more than enough */
626 const char *name = fname + (*fname == '/');
627
628 if (!*name)
629 return 0;
630
631 if (!(name_flags & NAME_IS_XATTR) ^ !(ex->rflags & FILTRULE_XATTR))
632 return 0;
633
634 if (!ex->u.slash_cnt && !(ex->rflags & FILTRULE_WILD2)) {
635 /* If the pattern does not have any slashes AND it does
636 * not have a "**" (which could match a slash), then we
637 * just match the name portion of the path. */
638 if ((p = strrchr(name,'/')) != NULL)
639 name = p+1;
640 } else if (ex->rflags & FILTRULE_ABS_PATH && *fname != '/'
641 && curr_dir_len > module_dirlen + 1) {
642 /* If we're matching against an absolute-path pattern,
643 * we need to prepend our full path info. */
644 strings[str_cnt++] = curr_dir + module_dirlen + 1;
645 strings[str_cnt++] = "/";
646 } else if (ex->rflags & FILTRULE_WILD2_PREFIX && *fname != '/') {
647 /* Allow "**"+"/" to match at the start of the string. */
648 strings[str_cnt++] = "/";
649 }
650 strings[str_cnt++] = name;
651 if (name_flags & NAME_IS_DIR) {
652 /* Allow a trailing "/"+"***" to match the directory. */
653 if (ex->rflags & FILTRULE_WILD3_SUFFIX)
654 strings[str_cnt++] = "/";
655 } else if (ex->rflags & FILTRULE_DIRECTORY)
656 return !ret_match;
657 strings[str_cnt] = NULL;
658
659 if (*pattern == '/') {
660 anchored_match = 1;
661 pattern++;
662 }
663
664 if (!anchored_match && ex->u.slash_cnt
665 && !(ex->rflags & FILTRULE_WILD2)) {
666 /* A non-anchored match with an infix slash and no "**"
667 * needs to match the last slash_cnt+1 name elements. */
668 slash_handling = ex->u.slash_cnt + 1;
669 } else if (!anchored_match && !(ex->rflags & FILTRULE_WILD2_PREFIX)
670 && ex->rflags & FILTRULE_WILD2) {
671 /* A non-anchored match with an infix or trailing "**" (but not
672 * a prefixed "**") needs to try matching after every slash. */
673 slash_handling = -1;
674 } else {
675 /* The pattern matches only at the start of the path or name. */
676 slash_handling = 0;
677 }
678
679 if (ex->rflags & FILTRULE_WILD) {
680 if (wildmatch_array(pattern, strings, slash_handling))
681 return ret_match;
682 } else if (str_cnt > 1) {
683 if (litmatch_array(pattern, strings, slash_handling))
684 return ret_match;
685 } else if (anchored_match) {
686 if (strcmp(name, pattern) == 0)
687 return ret_match;
688 } else {
689 int l1 = strlen(name);
690 int l2 = strlen(pattern);
691 if (l2 <= l1 &&
692 strcmp(name+(l1-l2),pattern) == 0 &&
693 (l1==l2 || name[l1-(l2+1)] == '/')) {
694 return ret_match;
695 }
696 }
697
698 return !ret_match;
699 }
700
report_filter_result(enum logcode code,char const * name,filter_rule const * ent,int name_flags,const char * type)701 static void report_filter_result(enum logcode code, char const *name,
702 filter_rule const *ent,
703 int name_flags, const char *type)
704 {
705 /* If a trailing slash is present to match only directories,
706 * then it is stripped out by add_rule(). So as a special
707 * case we add it back in here. */
708
709 if (DEBUG_GTE(FILTER, 1)) {
710 static char *actions[2][2]
711 = { {"show", "hid"}, {"risk", "protect"} };
712 const char *w = who_am_i();
713 const char *t = name_flags & NAME_IS_XATTR ? "xattr"
714 : name_flags & NAME_IS_DIR ? "directory"
715 : "file";
716 rprintf(code, "[%s] %sing %s %s because of pattern %s%s%s\n",
717 w, actions[*w!='s'][!(ent->rflags & FILTRULE_INCLUDE)],
718 t, name, ent->pattern,
719 ent->rflags & FILTRULE_DIRECTORY ? "/" : "", type);
720 }
721 }
722
723 /* This function is used to check if a file should be included/excluded
724 * from the list of files based on its name and type etc. The value of
725 * filter_level is set to either SERVER_FILTERS or ALL_FILTERS. */
name_is_excluded(const char * fname,int name_flags,int filter_level)726 int name_is_excluded(const char *fname, int name_flags, int filter_level)
727 {
728 if (daemon_filter_list.head && check_filter(&daemon_filter_list, FLOG, fname, name_flags) < 0) {
729 if (!(name_flags & NAME_IS_XATTR))
730 errno = ENOENT;
731 return 1;
732 }
733
734 if (filter_level != ALL_FILTERS)
735 return 0;
736
737 if (filter_list.head && check_filter(&filter_list, FINFO, fname, name_flags) < 0)
738 return 1;
739
740 return 0;
741 }
742
743 /* Return -1 if file "name" is defined to be excluded by the specified
744 * exclude list, 1 if it is included, and 0 if it was not matched. */
check_filter(filter_rule_list * listp,enum logcode code,const char * name,int name_flags)745 int check_filter(filter_rule_list *listp, enum logcode code,
746 const char *name, int name_flags)
747 {
748 filter_rule *ent;
749
750 for (ent = listp->head; ent; ent = ent->next) {
751 if (ignore_perishable && ent->rflags & FILTRULE_PERISHABLE)
752 continue;
753 if (ent->rflags & FILTRULE_PERDIR_MERGE) {
754 int rc = check_filter(ent->u.mergelist, code, name, name_flags);
755 if (rc)
756 return rc;
757 continue;
758 }
759 if (ent->rflags & FILTRULE_CVS_IGNORE) {
760 int rc = check_filter(&cvs_filter_list, code, name, name_flags);
761 if (rc)
762 return rc;
763 continue;
764 }
765 if (rule_matches(name, ent, name_flags)) {
766 report_filter_result(code, name, ent, name_flags, listp->debug_type);
767 return ent->rflags & FILTRULE_INCLUDE ? 1 : -1;
768 }
769 }
770
771 return 0;
772 }
773
774 #define RULE_STRCMP(s,r) rule_strcmp((s), (r), sizeof (r) - 1)
775
rule_strcmp(const uchar * str,const char * rule,int rule_len)776 static const uchar *rule_strcmp(const uchar *str, const char *rule, int rule_len)
777 {
778 if (strncmp((char*)str, rule, rule_len) != 0)
779 return NULL;
780 if (isspace(str[rule_len]) || str[rule_len] == '_' || !str[rule_len])
781 return str + rule_len - 1;
782 if (str[rule_len] == ',')
783 return str + rule_len;
784 return NULL;
785 }
786
787 #define FILTRULES_FROM_CONTAINER (FILTRULE_ABS_PATH | FILTRULE_INCLUDE \
788 | FILTRULE_DIRECTORY | FILTRULE_NEGATE \
789 | FILTRULE_PERISHABLE)
790
791 /* Gets the next include/exclude rule from *rulestr_ptr and advances
792 * *rulestr_ptr to point beyond it. Stores the pattern's start (within
793 * *rulestr_ptr) and length in *pat_ptr and *pat_len_ptr, and returns a newly
794 * allocated filter_rule containing the rest of the information. Returns
795 * NULL if there are no more rules in the input.
796 *
797 * The template provides defaults for the new rule to inherit, and the
798 * template rflags and the xflags additionally affect parsing. */
parse_rule_tok(const char ** rulestr_ptr,const filter_rule * template,int xflags,const char ** pat_ptr,unsigned int * pat_len_ptr)799 static filter_rule *parse_rule_tok(const char **rulestr_ptr,
800 const filter_rule *template, int xflags,
801 const char **pat_ptr, unsigned int *pat_len_ptr)
802 {
803 const uchar *s = (const uchar *)*rulestr_ptr;
804 filter_rule *rule;
805 unsigned int len;
806
807 if (template->rflags & FILTRULE_WORD_SPLIT) {
808 /* Skip over any initial whitespace. */
809 while (isspace(*s))
810 s++;
811 /* Update to point to real start of rule. */
812 *rulestr_ptr = (const char *)s;
813 }
814 if (!*s)
815 return NULL;
816
817 rule = new0(filter_rule);
818
819 /* Inherit from the template. Don't inherit FILTRULES_SIDES; we check
820 * that later. */
821 rule->rflags = template->rflags & FILTRULES_FROM_CONTAINER;
822
823 /* Figure out what kind of a filter rule "s" is pointing at. Note
824 * that if FILTRULE_NO_PREFIXES is set, the rule is either an include
825 * or an exclude based on the inheritance of the FILTRULE_INCLUDE
826 * flag (above). XFLG_OLD_PREFIXES indicates a compatibility mode
827 * for old include/exclude patterns where just "+ " and "- " are
828 * allowed as optional prefixes. */
829 if (template->rflags & FILTRULE_NO_PREFIXES) {
830 if (*s == '!' && template->rflags & FILTRULE_CVS_IGNORE)
831 rule->rflags |= FILTRULE_CLEAR_LIST; /* Tentative! */
832 } else if (xflags & XFLG_OLD_PREFIXES) {
833 if (*s == '-' && s[1] == ' ') {
834 rule->rflags &= ~FILTRULE_INCLUDE;
835 s += 2;
836 } else if (*s == '+' && s[1] == ' ') {
837 rule->rflags |= FILTRULE_INCLUDE;
838 s += 2;
839 } else if (*s == '!')
840 rule->rflags |= FILTRULE_CLEAR_LIST; /* Tentative! */
841 } else {
842 char ch = 0;
843 BOOL prefix_specifies_side = False;
844 switch (*s) {
845 case 'c':
846 if ((s = RULE_STRCMP(s, "clear")) != NULL)
847 ch = '!';
848 break;
849 case 'd':
850 if ((s = RULE_STRCMP(s, "dir-merge")) != NULL)
851 ch = ':';
852 break;
853 case 'e':
854 if ((s = RULE_STRCMP(s, "exclude")) != NULL)
855 ch = '-';
856 break;
857 case 'h':
858 if ((s = RULE_STRCMP(s, "hide")) != NULL)
859 ch = 'H';
860 break;
861 case 'i':
862 if ((s = RULE_STRCMP(s, "include")) != NULL)
863 ch = '+';
864 break;
865 case 'm':
866 if ((s = RULE_STRCMP(s, "merge")) != NULL)
867 ch = '.';
868 break;
869 case 'p':
870 if ((s = RULE_STRCMP(s, "protect")) != NULL)
871 ch = 'P';
872 break;
873 case 'r':
874 if ((s = RULE_STRCMP(s, "risk")) != NULL)
875 ch = 'R';
876 break;
877 case 's':
878 if ((s = RULE_STRCMP(s, "show")) != NULL)
879 ch = 'S';
880 break;
881 default:
882 ch = *s;
883 if (s[1] == ',')
884 s++;
885 break;
886 }
887 switch (ch) {
888 case ':':
889 rule->rflags |= FILTRULE_PERDIR_MERGE
890 | FILTRULE_FINISH_SETUP;
891 /* FALL THROUGH */
892 case '.':
893 rule->rflags |= FILTRULE_MERGE_FILE;
894 break;
895 case '+':
896 rule->rflags |= FILTRULE_INCLUDE;
897 break;
898 case '-':
899 break;
900 case 'S':
901 rule->rflags |= FILTRULE_INCLUDE;
902 /* FALL THROUGH */
903 case 'H':
904 rule->rflags |= FILTRULE_SENDER_SIDE;
905 prefix_specifies_side = True;
906 break;
907 case 'R':
908 rule->rflags |= FILTRULE_INCLUDE;
909 /* FALL THROUGH */
910 case 'P':
911 rule->rflags |= FILTRULE_RECEIVER_SIDE;
912 prefix_specifies_side = True;
913 break;
914 case '!':
915 rule->rflags |= FILTRULE_CLEAR_LIST;
916 break;
917 default:
918 rprintf(FERROR, "Unknown filter rule: `%s'\n", *rulestr_ptr);
919 exit_cleanup(RERR_SYNTAX);
920 }
921 while (ch != '!' && *++s && *s != ' ' && *s != '_') {
922 if (template->rflags & FILTRULE_WORD_SPLIT && isspace(*s)) {
923 s--;
924 break;
925 }
926 switch (*s) {
927 default:
928 invalid:
929 rprintf(FERROR,
930 "invalid modifier '%c' at position %d in filter rule: %s\n",
931 *s, (int)(s - (const uchar *)*rulestr_ptr), *rulestr_ptr);
932 exit_cleanup(RERR_SYNTAX);
933 case '-':
934 if (!BITS_SETnUNSET(rule->rflags, FILTRULE_MERGE_FILE, FILTRULE_NO_PREFIXES))
935 goto invalid;
936 rule->rflags |= FILTRULE_NO_PREFIXES;
937 break;
938 case '+':
939 if (!BITS_SETnUNSET(rule->rflags, FILTRULE_MERGE_FILE, FILTRULE_NO_PREFIXES))
940 goto invalid;
941 rule->rflags |= FILTRULE_NO_PREFIXES
942 | FILTRULE_INCLUDE;
943 break;
944 case '/':
945 rule->rflags |= FILTRULE_ABS_PATH;
946 break;
947 case '!':
948 /* Negation really goes with the pattern, so it
949 * isn't useful as a merge-file default. */
950 if (rule->rflags & FILTRULE_MERGE_FILE)
951 goto invalid;
952 rule->rflags |= FILTRULE_NEGATE;
953 break;
954 case 'C':
955 if (rule->rflags & FILTRULE_NO_PREFIXES || prefix_specifies_side)
956 goto invalid;
957 rule->rflags |= FILTRULE_NO_PREFIXES
958 | FILTRULE_WORD_SPLIT
959 | FILTRULE_NO_INHERIT
960 | FILTRULE_CVS_IGNORE;
961 break;
962 case 'e':
963 if (!(rule->rflags & FILTRULE_MERGE_FILE))
964 goto invalid;
965 rule->rflags |= FILTRULE_EXCLUDE_SELF;
966 break;
967 case 'n':
968 if (!(rule->rflags & FILTRULE_MERGE_FILE))
969 goto invalid;
970 rule->rflags |= FILTRULE_NO_INHERIT;
971 break;
972 case 'p':
973 rule->rflags |= FILTRULE_PERISHABLE;
974 break;
975 case 'r':
976 if (prefix_specifies_side)
977 goto invalid;
978 rule->rflags |= FILTRULE_RECEIVER_SIDE;
979 break;
980 case 's':
981 if (prefix_specifies_side)
982 goto invalid;
983 rule->rflags |= FILTRULE_SENDER_SIDE;
984 break;
985 case 'w':
986 if (!(rule->rflags & FILTRULE_MERGE_FILE))
987 goto invalid;
988 rule->rflags |= FILTRULE_WORD_SPLIT;
989 break;
990 case 'x':
991 rule->rflags |= FILTRULE_XATTR;
992 saw_xattr_filter = 1;
993 break;
994 }
995 }
996 if (*s)
997 s++;
998 }
999 if (template->rflags & FILTRULES_SIDES) {
1000 if (rule->rflags & FILTRULES_SIDES) {
1001 /* The filter and template both specify side(s). This
1002 * is dodgy (and won't work correctly if the template is
1003 * a one-sided per-dir merge rule), so reject it. */
1004 rprintf(FERROR,
1005 "specified-side merge file contains specified-side filter: %s\n",
1006 *rulestr_ptr);
1007 exit_cleanup(RERR_SYNTAX);
1008 }
1009 rule->rflags |= template->rflags & FILTRULES_SIDES;
1010 }
1011
1012 if (template->rflags & FILTRULE_WORD_SPLIT) {
1013 const uchar *cp = s;
1014 /* Token ends at whitespace or the end of the string. */
1015 while (!isspace(*cp) && *cp != '\0')
1016 cp++;
1017 len = cp - s;
1018 } else
1019 len = strlen((char*)s);
1020
1021 if (rule->rflags & FILTRULE_CLEAR_LIST) {
1022 if (!(rule->rflags & FILTRULE_NO_PREFIXES)
1023 && !(xflags & XFLG_OLD_PREFIXES) && len) {
1024 rprintf(FERROR,
1025 "'!' rule has trailing characters: %s\n", *rulestr_ptr);
1026 exit_cleanup(RERR_SYNTAX);
1027 }
1028 if (len > 1)
1029 rule->rflags &= ~FILTRULE_CLEAR_LIST;
1030 } else if (!len && !(rule->rflags & FILTRULE_CVS_IGNORE)) {
1031 rprintf(FERROR, "unexpected end of filter rule: %s\n", *rulestr_ptr);
1032 exit_cleanup(RERR_SYNTAX);
1033 }
1034
1035 /* --delete-excluded turns an un-modified include/exclude into a sender-side rule. */
1036 if (delete_excluded
1037 && !(rule->rflags & (FILTRULES_SIDES|FILTRULE_MERGE_FILE|FILTRULE_PERDIR_MERGE)))
1038 rule->rflags |= FILTRULE_SENDER_SIDE;
1039
1040 *pat_ptr = (const char *)s;
1041 *pat_len_ptr = len;
1042 *rulestr_ptr = *pat_ptr + len;
1043 return rule;
1044 }
1045
get_cvs_excludes(uint32 rflags)1046 static void get_cvs_excludes(uint32 rflags)
1047 {
1048 static int initialized = 0;
1049 char *p, fname[MAXPATHLEN];
1050
1051 if (initialized)
1052 return;
1053 initialized = 1;
1054
1055 parse_filter_str(&cvs_filter_list, default_cvsignore(),
1056 rule_template(rflags | (protocol_version >= 30 ? FILTRULE_PERISHABLE : 0)),
1057 0);
1058
1059 p = module_id >= 0 && lp_use_chroot(module_id) ? "/" : getenv("HOME");
1060 if (p && pathjoin(fname, MAXPATHLEN, p, ".cvsignore") < MAXPATHLEN)
1061 parse_filter_file(&cvs_filter_list, fname, rule_template(rflags), 0);
1062
1063 parse_filter_str(&cvs_filter_list, getenv("CVSIGNORE"), rule_template(rflags), 0);
1064 }
1065
rule_template(uint32 rflags)1066 const filter_rule *rule_template(uint32 rflags)
1067 {
1068 static filter_rule template; /* zero-initialized */
1069 template.rflags = rflags;
1070 return &template;
1071 }
1072
parse_filter_str(filter_rule_list * listp,const char * rulestr,const filter_rule * template,int xflags)1073 void parse_filter_str(filter_rule_list *listp, const char *rulestr,
1074 const filter_rule *template, int xflags)
1075 {
1076 filter_rule *rule;
1077 const char *pat;
1078 unsigned int pat_len;
1079
1080 if (!rulestr)
1081 return;
1082
1083 while (1) {
1084 uint32 new_rflags;
1085
1086 /* Remember that the returned string is NOT '\0' terminated! */
1087 if (!(rule = parse_rule_tok(&rulestr, template, xflags, &pat, &pat_len)))
1088 break;
1089
1090 if (pat_len >= MAXPATHLEN) {
1091 rprintf(FERROR, "discarding over-long filter: %.*s\n",
1092 (int)pat_len, pat);
1093 free_continue:
1094 free_filter(rule);
1095 continue;
1096 }
1097
1098 new_rflags = rule->rflags;
1099 if (new_rflags & FILTRULE_CLEAR_LIST) {
1100 if (DEBUG_GTE(FILTER, 2)) {
1101 rprintf(FINFO,
1102 "[%s] clearing filter list%s\n",
1103 who_am_i(), listp->debug_type);
1104 }
1105 pop_filter_list(listp);
1106 listp->head = NULL;
1107 goto free_continue;
1108 }
1109
1110 if (new_rflags & FILTRULE_MERGE_FILE) {
1111 if (!pat_len) {
1112 pat = ".cvsignore";
1113 pat_len = 10;
1114 }
1115 if (new_rflags & FILTRULE_EXCLUDE_SELF) {
1116 const char *name;
1117 filter_rule *excl_self;
1118
1119 excl_self = new0(filter_rule);
1120 /* Find the beginning of the basename and add an exclude for it. */
1121 for (name = pat + pat_len; name > pat && name[-1] != '/'; name--) {}
1122 add_rule(listp, name, (pat + pat_len) - name, excl_self, 0);
1123 rule->rflags &= ~FILTRULE_EXCLUDE_SELF;
1124 }
1125 if (new_rflags & FILTRULE_PERDIR_MERGE) {
1126 if (parent_dirscan) {
1127 const char *p;
1128 unsigned int len = pat_len;
1129 if ((p = parse_merge_name(pat, &len, module_dirlen)))
1130 add_rule(listp, p, len, rule, 0);
1131 else
1132 free_filter(rule);
1133 continue;
1134 }
1135 } else {
1136 const char *p;
1137 unsigned int len = pat_len;
1138 if ((p = parse_merge_name(pat, &len, 0)))
1139 parse_filter_file(listp, p, rule, XFLG_FATAL_ERRORS);
1140 free_filter(rule);
1141 continue;
1142 }
1143 }
1144
1145 add_rule(listp, pat, pat_len, rule, xflags);
1146
1147 if (new_rflags & FILTRULE_CVS_IGNORE
1148 && !(new_rflags & FILTRULE_MERGE_FILE))
1149 get_cvs_excludes(new_rflags);
1150 }
1151 }
1152
parse_filter_file(filter_rule_list * listp,const char * fname,const filter_rule * template,int xflags)1153 void parse_filter_file(filter_rule_list *listp, const char *fname, const filter_rule *template, int xflags)
1154 {
1155 FILE *fp;
1156 char line[BIGPATHBUFLEN];
1157 char *eob = line + sizeof line - 1;
1158 BOOL word_split = (template->rflags & FILTRULE_WORD_SPLIT) != 0;
1159
1160 if (!fname || !*fname)
1161 return;
1162
1163 if (*fname != '-' || fname[1] || am_server) {
1164 if (daemon_filter_list.head) {
1165 strlcpy(line, fname, sizeof line);
1166 clean_fname(line, CFN_COLLAPSE_DOT_DOT_DIRS);
1167 if (check_filter(&daemon_filter_list, FLOG, line, 0) < 0)
1168 fp = NULL;
1169 else
1170 fp = fopen(line, "rb");
1171 } else
1172 fp = fopen(fname, "rb");
1173 } else
1174 fp = stdin;
1175
1176 if (DEBUG_GTE(FILTER, 2)) {
1177 rprintf(FINFO, "[%s] parse_filter_file(%s,%x,%x)%s\n",
1178 who_am_i(), fname, template->rflags, xflags,
1179 fp ? "" : " [not found]");
1180 }
1181
1182 if (!fp) {
1183 if (xflags & XFLG_FATAL_ERRORS) {
1184 rsyserr(FERROR, errno,
1185 "failed to open %sclude file %s",
1186 template->rflags & FILTRULE_INCLUDE ? "in" : "ex",
1187 fname);
1188 exit_cleanup(RERR_FILEIO);
1189 }
1190 return;
1191 }
1192 dirbuf[dirbuf_len] = '\0';
1193
1194 while (1) {
1195 char *s = line;
1196 int ch, overflow = 0;
1197 while (1) {
1198 if ((ch = getc(fp)) == EOF) {
1199 if (ferror(fp) && errno == EINTR) {
1200 clearerr(fp);
1201 continue;
1202 }
1203 break;
1204 }
1205 if (word_split && isspace(ch))
1206 break;
1207 if (eol_nulls? !ch : (ch == '\n' || ch == '\r'))
1208 break;
1209 if (s < eob)
1210 *s++ = ch;
1211 else
1212 overflow = 1;
1213 }
1214 if (overflow) {
1215 rprintf(FERROR, "discarding over-long filter: %s...\n", line);
1216 s = line;
1217 }
1218 *s = '\0';
1219 /* Skip an empty token and (when line parsing) comments. */
1220 if (*line && (word_split || (*line != ';' && *line != '#')))
1221 parse_filter_str(listp, line, template, xflags);
1222 if (ch == EOF)
1223 break;
1224 }
1225 fclose(fp);
1226 }
1227
1228 /* If the "for_xfer" flag is set, the prefix is made compatible with the
1229 * current protocol_version (if possible) or a NULL is returned (if not
1230 * possible). */
get_rule_prefix(filter_rule * rule,const char * pat,int for_xfer,unsigned int * plen_ptr)1231 char *get_rule_prefix(filter_rule *rule, const char *pat, int for_xfer,
1232 unsigned int *plen_ptr)
1233 {
1234 static char buf[MAX_RULE_PREFIX+1];
1235 char *op = buf;
1236 int legal_len = for_xfer && protocol_version < 29 ? 1 : MAX_RULE_PREFIX-1;
1237
1238 if (rule->rflags & FILTRULE_PERDIR_MERGE) {
1239 if (legal_len == 1)
1240 return NULL;
1241 *op++ = ':';
1242 } else if (rule->rflags & FILTRULE_INCLUDE)
1243 *op++ = '+';
1244 else if (legal_len != 1
1245 || ((*pat == '-' || *pat == '+') && pat[1] == ' '))
1246 *op++ = '-';
1247 else
1248 legal_len = 0;
1249
1250 if (rule->rflags & FILTRULE_ABS_PATH)
1251 *op++ = '/';
1252 if (rule->rflags & FILTRULE_NEGATE)
1253 *op++ = '!';
1254 if (rule->rflags & FILTRULE_CVS_IGNORE)
1255 *op++ = 'C';
1256 else {
1257 if (rule->rflags & FILTRULE_NO_INHERIT)
1258 *op++ = 'n';
1259 if (rule->rflags & FILTRULE_WORD_SPLIT)
1260 *op++ = 'w';
1261 if (rule->rflags & FILTRULE_NO_PREFIXES) {
1262 if (rule->rflags & FILTRULE_INCLUDE)
1263 *op++ = '+';
1264 else
1265 *op++ = '-';
1266 }
1267 }
1268 if (rule->rflags & FILTRULE_EXCLUDE_SELF)
1269 *op++ = 'e';
1270 if (rule->rflags & FILTRULE_XATTR)
1271 *op++ = 'x';
1272 if (rule->rflags & FILTRULE_SENDER_SIDE
1273 && (!for_xfer || protocol_version >= 29))
1274 *op++ = 's';
1275 if (rule->rflags & FILTRULE_RECEIVER_SIDE
1276 && (!for_xfer || protocol_version >= 29
1277 || (delete_excluded && am_sender)))
1278 *op++ = 'r';
1279 if (rule->rflags & FILTRULE_PERISHABLE) {
1280 if (!for_xfer || protocol_version >= 30)
1281 *op++ = 'p';
1282 else if (am_sender)
1283 return NULL;
1284 }
1285 if (op - buf > legal_len)
1286 return NULL;
1287 if (legal_len)
1288 *op++ = ' ';
1289 *op = '\0';
1290 if (plen_ptr)
1291 *plen_ptr = op - buf;
1292 return buf;
1293 }
1294
send_rules(int f_out,filter_rule_list * flp)1295 static void send_rules(int f_out, filter_rule_list *flp)
1296 {
1297 filter_rule *ent, *prev = NULL;
1298
1299 for (ent = flp->head; ent; ent = ent->next) {
1300 unsigned int len, plen, dlen;
1301 int elide = 0;
1302 char *p;
1303
1304 /* Note we need to check delete_excluded here in addition to
1305 * the code in parse_rule_tok() because some rules may have
1306 * been added before we found the --delete-excluded option.
1307 * We must also elide any CVS merge-file rules to avoid a
1308 * backward compatibility problem, and we elide any no-prefix
1309 * merge files as an optimization (since they can only have
1310 * include/exclude rules). */
1311 if (ent->rflags & FILTRULE_SENDER_SIDE)
1312 elide = am_sender ? 1 : -1;
1313 if (ent->rflags & FILTRULE_RECEIVER_SIDE)
1314 elide = elide ? 0 : am_sender ? -1 : 1;
1315 else if (delete_excluded && !elide
1316 && (!(ent->rflags & FILTRULE_PERDIR_MERGE)
1317 || ent->rflags & FILTRULE_NO_PREFIXES))
1318 elide = am_sender ? 1 : -1;
1319 if (elide < 0) {
1320 if (prev)
1321 prev->next = ent->next;
1322 else
1323 flp->head = ent->next;
1324 } else
1325 prev = ent;
1326 if (elide > 0)
1327 continue;
1328 if (ent->rflags & FILTRULE_CVS_IGNORE
1329 && !(ent->rflags & FILTRULE_MERGE_FILE)) {
1330 int f = am_sender || protocol_version < 29 ? f_out : -2;
1331 send_rules(f, &cvs_filter_list);
1332 if (f == f_out)
1333 continue;
1334 }
1335 p = get_rule_prefix(ent, ent->pattern, 1, &plen);
1336 if (!p) {
1337 rprintf(FERROR,
1338 "filter rules are too modern for remote rsync.\n");
1339 exit_cleanup(RERR_PROTOCOL);
1340 }
1341 if (f_out < 0)
1342 continue;
1343 len = strlen(ent->pattern);
1344 dlen = ent->rflags & FILTRULE_DIRECTORY ? 1 : 0;
1345 if (!(plen + len + dlen))
1346 continue;
1347 write_int(f_out, plen + len + dlen);
1348 if (plen)
1349 write_buf(f_out, p, plen);
1350 write_buf(f_out, ent->pattern, len);
1351 if (dlen)
1352 write_byte(f_out, '/');
1353 }
1354 flp->tail = prev;
1355 }
1356
1357 /* This is only called by the client. */
send_filter_list(int f_out)1358 void send_filter_list(int f_out)
1359 {
1360 int receiver_wants_list = prune_empty_dirs
1361 || (delete_mode && (!delete_excluded || protocol_version >= 29));
1362
1363 if (local_server || (am_sender && !receiver_wants_list))
1364 f_out = -1;
1365 if (cvs_exclude && am_sender) {
1366 if (protocol_version >= 29)
1367 parse_filter_str(&filter_list, ":C", rule_template(0), 0);
1368 parse_filter_str(&filter_list, "-C", rule_template(0), 0);
1369 }
1370
1371 send_rules(f_out, &filter_list);
1372
1373 if (f_out >= 0)
1374 write_int(f_out, 0);
1375
1376 if (cvs_exclude) {
1377 if (!am_sender || protocol_version < 29)
1378 parse_filter_str(&filter_list, ":C", rule_template(0), 0);
1379 if (!am_sender)
1380 parse_filter_str(&filter_list, "-C", rule_template(0), 0);
1381 }
1382 }
1383
1384 /* This is only called by the server. */
recv_filter_list(int f_in)1385 void recv_filter_list(int f_in)
1386 {
1387 char line[BIGPATHBUFLEN];
1388 int xflags = protocol_version >= 29 ? 0 : XFLG_OLD_PREFIXES;
1389 int receiver_wants_list = prune_empty_dirs
1390 || (delete_mode && (!delete_excluded || protocol_version >= 29));
1391 unsigned int len;
1392
1393 if (!local_server && (am_sender || receiver_wants_list)) {
1394 while ((len = read_int(f_in)) != 0) {
1395 if (len >= sizeof line)
1396 overflow_exit("recv_rules");
1397 read_sbuf(f_in, line, len);
1398 parse_filter_str(&filter_list, line, rule_template(0), xflags);
1399 }
1400 }
1401
1402 if (cvs_exclude) {
1403 if (local_server || am_sender || protocol_version < 29)
1404 parse_filter_str(&filter_list, ":C", rule_template(0), 0);
1405 if (local_server || am_sender)
1406 parse_filter_str(&filter_list, "-C", rule_template(0), 0);
1407 }
1408
1409 if (local_server) /* filter out any rules that aren't for us. */
1410 send_rules(-1, &filter_list);
1411 }
1412