exclude.c

   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) 2003-2014 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
  25 extern int am_server;
  26 extern int am_sender;
  27 extern int eol_nulls;
  28 extern int io_error;
  29 extern int local_server;
  30 extern int prune_empty_dirs;
  31 extern int ignore_perishable;
  32 extern int delete_mode;
  33 extern int delete_excluded;
  34 extern int cvs_exclude;
  35 extern int sanitize_paths;
  36 extern int protocol_version;
  37 extern int module_id;
  38
  39 extern char curr_dir[MAXPATHLEN];
  40 extern unsigned int curr_dir_len;
  41 extern unsigned int module_dirlen;
  42
  43 filter_rule_list filter_list = { .debug_type = "" };
  44 filter_rule_list cvs_filter_list = { .debug_type = " [global CVS]" };
  45 filter_rule_list daemon_filter_list = { .debug_type = " [daemon]" };
  46
  47 /* Need room enough for ":MODS " prefix plus some room to grow. */
  48 #define MAX_RULE_PREFIX (16)
  49
  50 #define SLASH_WILD3_SUFFIX "/***"
  51
  52 /* The dirbuf is set by push_local_filters() to the current subdirectory
  53  * relative to curr_dir that is being processed.  The path always has a
  54  * trailing slash appended, and the variable dirbuf_len contains the length
  55  * of this path prefix.  The path is always absolute. */
  56 static char dirbuf[MAXPATHLEN+1];
  57 static unsigned int dirbuf_len = 0;
  58 static int dirbuf_depth;
  59
  60 /* This is True when we're scanning parent dirs for per-dir merge-files. */
  61 static BOOL parent_dirscan = False;
  62
  63 /* This array contains a list of all the currently active per-dir merge
  64  * files.  This makes it easier to save the appropriate values when we
  65  * "push" down into each subdirectory. */
  66 static filter_rule **mergelist_parents;
  67 static int mergelist_cnt = 0;
  68 static int mergelist_size = 0;
  69
  70 /* Each filter_list_struct describes a singly-linked list by keeping track
  71  * of both the head and tail pointers.  The list is slightly unusual in that
  72  * a parent-dir's content can be appended to the end of the local list in a
  73  * special way:  the last item in the local list has its "next" pointer set
  74  * to point to the inherited list, but the local list's tail pointer points
  75  * at the end of the local list.  Thus, if the local list is empty, the head
  76  * will be pointing at the inherited content but the tail will be NULL.  To
  77  * help you visualize this, here are the possible list arrangements:
  78  *
  79  * Completely Empty                     Local Content Only
  80  * ==================================   ====================================
  81  * head -> NULL                         head -> Local1 -> Local2 -> NULL
  82  * tail -> NULL                         tail -------------^
  83  *
  84  * Inherited Content Only               Both Local and Inherited Content
  85  * ==================================   ====================================
  86  * head -> Parent1 -> Parent2 -> NULL   head -> L1 -> L2 -> P1 -> P2 -> NULL
  87  * tail -> NULL                         tail ---------^
  88  *
  89  * This means that anyone wanting to traverse the whole list to use it just
  90  * needs to start at the head and use the "next" pointers until it goes
  91  * NULL.  To add new local content, we insert the item after the tail item
  92  * and update the tail (obviously, if "tail" was NULL, we insert it at the
  93  * head).  To clear the local list, WE MUST NOT FREE THE INHERITED CONTENT
  94  * because it is shared between the current list and our parent list(s).
  95  * The easiest way to handle this is to simply truncate the list after the
  96  * tail item and then free the local list from the head.  When inheriting
  97  * the list for a new local dir, we just save off the filter_list_struct
  98  * values (so we can pop back to them later) and set the tail to NULL.
  99  */
 100
 101 static void teardown_mergelist(filter_rule *ex)
 102 {
 103         if (DEBUG_GTE(FILTER, 2)) {
 104                 rprintf(FINFO, "[%s] deactivating mergelist #%d%s\n",
 105                         who_am_i(), mergelist_cnt - 1,
 106                         ex->u.mergelist->debug_type);
 107         }
 108
 109         /* We should deactivate mergelists in LIFO order. */
 110         assert(mergelist_cnt > 0);
 111         assert(ex == mergelist_parents[mergelist_cnt - 1]);
 112
 113         /* The parent_dirscan filters should have been freed. */
 114         assert(ex->u.mergelist->parent_dirscan_head == NULL);
 115
 116         free(ex->u.mergelist->debug_type);
 117         free(ex->u.mergelist);
 118         mergelist_cnt--;
 119 }
 120
 121 static void free_filter(filter_rule *ex)
 122 {
 123         free(ex->pattern);
 124         free(ex);
 125 }
 126
 127 static void free_filters(filter_rule *head)
 128 {
 129         filter_rule *rev_head = NULL;
 130
 131         /* Reverse the list so we deactivate mergelists in the proper LIFO
 132          * order. */
 133         while (head) {
 134                 filter_rule *next = head->next;
 135                 head->next = rev_head;
 136                 rev_head = head;
 137                 head = next;
 138         }
 139
 140         while (rev_head) {
 141                 filter_rule *prev = rev_head->next;
 142                 /* Tear down mergelists here, not in free_filter, so that we
 143                  * affect only real filter lists and not temporarily allocated
 144                  * filters. */
 145                 if (rev_head->rflags & FILTRULE_PERDIR_MERGE)
 146                         teardown_mergelist(rev_head);
 147                 free_filter(rev_head);
 148                 rev_head = prev;
 149         }
 150 }
 151
 152 /* Build a filter structure given a filter pattern.  The value in "pat"
 153  * is not null-terminated.  "rule" is either held or freed, so the
 154  * caller should not free it. */
 155 static void add_rule(filter_rule_list *listp, const char *pat, unsigned int pat_len,
 156                      filter_rule *rule, int xflags)
 157 {
 158         const char *cp;
 159         unsigned int pre_len, suf_len, slash_cnt = 0;
 160
 161         if (DEBUG_GTE(FILTER, 2)) {
 162                 rprintf(FINFO, "[%s] add_rule(%s%.*s%s)%s\n",
 163                         who_am_i(), get_rule_prefix(rule, pat, 0, NULL),
 164                         (int)pat_len, pat,
 165                         (rule->rflags & FILTRULE_DIRECTORY) ? "/" : "",
 166                         listp->debug_type);
 167         }
 168
 169         /* These flags also indicate that we're reading a list that
 170          * needs to be filtered now, not post-filtered later. */
 171         if (xflags & (XFLG_ANCHORED2ABS|XFLG_ABS_IF_SLASH)
 172                 && (rule->rflags & FILTRULES_SIDES)
 173                         == (am_sender ? FILTRULE_RECEIVER_SIDE : FILTRULE_SENDER_SIDE)) {
 174                 /* This filter applies only to the other side.  Drop it. */
 175                 free_filter(rule);
 176                 return;
 177         }
 178
 179         if (pat_len > 1 && pat[pat_len-1] == '/') {
 180                 pat_len--;
 181                 rule->rflags |= FILTRULE_DIRECTORY;
 182         }
 183
 184         for (cp = pat; cp < pat + pat_len; cp++) {
 185                 if (*cp == '/')
 186                         slash_cnt++;
 187         }
 188
 189         if (!(rule->rflags & (FILTRULE_ABS_PATH | FILTRULE_MERGE_FILE))
 190          && ((xflags & (XFLG_ANCHORED2ABS|XFLG_ABS_IF_SLASH) && *pat == '/')
 191           || (xflags & XFLG_ABS_IF_SLASH && slash_cnt))) {
 192                 rule->rflags |= FILTRULE_ABS_PATH;
 193                 if (*pat == '/')
 194                         pre_len = dirbuf_len - module_dirlen - 1;
 195                 else
 196                         pre_len = 0;
 197         } else
 198                 pre_len = 0;
 199
 200         /* The daemon wants dir-exclude rules to get an appended "/" + "***". */
 201         if (xflags & XFLG_DIR2WILD3
 202          && BITS_SETnUNSET(rule->rflags, FILTRULE_DIRECTORY, FILTRULE_INCLUDE)) {
 203                 rule->rflags &= ~FILTRULE_DIRECTORY;
 204                 suf_len = sizeof SLASH_WILD3_SUFFIX - 1;
 205         } else
 206                 suf_len = 0;
 207
 208         if (!(rule->pattern = new_array(char, pre_len + pat_len + suf_len + 1)))
 209                 out_of_memory("add_rule");
 210         if (pre_len) {
 211                 memcpy(rule->pattern, dirbuf + module_dirlen, pre_len);
 212                 for (cp = rule->pattern; cp < rule->pattern + pre_len; cp++) {
 213                         if (*cp == '/')
 214                                 slash_cnt++;
 215                 }
 216         }
 217         strlcpy(rule->pattern + pre_len, pat, pat_len + 1);
 218         pat_len += pre_len;
 219         if (suf_len) {
 220                 memcpy(rule->pattern + pat_len, SLASH_WILD3_SUFFIX, suf_len+1);
 221                 pat_len += suf_len;
 222                 slash_cnt++;
 223         }
 224
 225         if (strpbrk(rule->pattern, "*[?")) {
 226                 rule->rflags |= FILTRULE_WILD;
 227                 if ((cp = strstr(rule->pattern, "**")) != NULL) {
 228                         rule->rflags |= FILTRULE_WILD2;
 229                         /* If the pattern starts with **, note that. */
 230                         if (cp == rule->pattern)
 231                                 rule->rflags |= FILTRULE_WILD2_PREFIX;
 232                         /* If the pattern ends with ***, note that. */
 233                         if (pat_len >= 3
 234                          && rule->pattern[pat_len-3] == '*'
 235                          && rule->pattern[pat_len-2] == '*'
 236                          && rule->pattern[pat_len-1] == '*')
 237                                 rule->rflags |= FILTRULE_WILD3_SUFFIX;
 238                 }
 239         }
 240
 241         if (rule->rflags & FILTRULE_PERDIR_MERGE) {
 242                 filter_rule_list *lp;
 243                 unsigned int len;
 244                 int i;
 245
 246                 if ((cp = strrchr(rule->pattern, '/')) != NULL)
 247                         cp++;
 248                 else
 249                         cp = rule->pattern;
 250
 251                 /* If the local merge file was already mentioned, don't
 252                  * add it again. */
 253                 for (i = 0; i < mergelist_cnt; i++) {
 254                         filter_rule *ex = mergelist_parents[i];
 255                         const char *s = strrchr(ex->pattern, '/');
 256                         if (s)
 257                                 s++;
 258                         else
 259                                 s = ex->pattern;
 260                         len = strlen(s);
 261                         if (len == pat_len - (cp - rule->pattern) && memcmp(s, cp, len) == 0) {
 262                                 free_filter(rule);
 263                                 return;
 264                         }
 265                 }
 266
 267                 if (!(lp = new_array(filter_rule_list, 1)))
 268                         out_of_memory("add_rule");
 269                 lp->head = lp->tail = lp->parent_dirscan_head = NULL;
 270                 if (asprintf(&lp->debug_type, " [per-dir %s]", cp) < 0)
 271                         out_of_memory("add_rule");
 272                 rule->u.mergelist = lp;
 273
 274                 if (mergelist_cnt == mergelist_size) {
 275                         mergelist_size += 5;
 276                         mergelist_parents = realloc_array(mergelist_parents,
 277                                                 filter_rule *,
 278                                                 mergelist_size);
 279                         if (!mergelist_parents)
 280                                 out_of_memory("add_rule");
 281                 }
 282                 if (DEBUG_GTE(FILTER, 2)) {
 283                         rprintf(FINFO, "[%s] activating mergelist #%d%s\n",
 284                                 who_am_i(), mergelist_cnt, lp->debug_type);
 285                 }
 286                 mergelist_parents[mergelist_cnt++] = rule;
 287         } else
 288                 rule->u.slash_cnt = slash_cnt;
 289
 290         if (!listp->tail) {
 291                 rule->next = listp->head;
 292                 listp->head = listp->tail = rule;
 293         } else {
 294                 rule->next = listp->tail->next;
 295                 listp->tail->next = rule;
 296                 listp->tail = rule;
 297         }
 298 }
 299
 300 static void clear_filter_list(filter_rule_list *listp)
 301 {
 302         if (listp->tail) {
 303                 /* Truncate any inherited items from the local list. */
 304                 listp->tail->next = NULL;
 305                 /* Now free everything that is left. */
 306                 free_filters(listp->head);
 307         }
 308
 309         listp->head = listp->tail = NULL;
 310 }
 311
 312 /* This returns an expanded (absolute) filename for the merge-file name if
 313  * the name has any slashes in it OR if the parent_dirscan var is True;
 314  * otherwise it returns the original merge_file name.  If the len_ptr value
 315  * is non-NULL the merge_file name is limited by the referenced length
 316  * value and will be updated with the length of the resulting name.  We
 317  * always return a name that is null terminated, even if the merge_file
 318  * name was not. */
 319 static char *parse_merge_name(const char *merge_file, unsigned int *len_ptr,
 320                               unsigned int prefix_skip)
 321 {
 322         static char buf[MAXPATHLEN];
 323         char *fn, tmpbuf[MAXPATHLEN];
 324         unsigned int fn_len;
 325
 326         if (!parent_dirscan && *merge_file != '/') {
 327                 /* Return the name unchanged it doesn't have any slashes. */
 328                 if (len_ptr) {
 329                         const char *p = merge_file + *len_ptr;
 330                         while (--p > merge_file && *p != '/') {}
 331                         if (p == merge_file) {
 332                                 strlcpy(buf, merge_file, *len_ptr + 1);
 333                                 return buf;
 334                         }
 335                 } else if (strchr(merge_file, '/') == NULL)
 336                         return (char *)merge_file;
 337         }
 338
 339         fn = *merge_file == '/' ? buf : tmpbuf;
 340         if (sanitize_paths) {
 341                 const char *r = prefix_skip ? "/" : NULL;
 342                 /* null-terminate the name if it isn't already */
 343                 if (len_ptr && merge_file[*len_ptr]) {
 344                         char *to = fn == buf ? tmpbuf : buf;
 345                         strlcpy(to, merge_file, *len_ptr + 1);
 346                         merge_file = to;
 347                 }
 348                 if (!sanitize_path(fn, merge_file, r, dirbuf_depth, SP_DEFAULT)) {
 349                         rprintf(FERROR, "merge-file name overflows: %s\n",
 350                                 merge_file);
 351                         return NULL;
 352                 }
 353                 fn_len = strlen(fn);
 354         } else {
 355                 strlcpy(fn, merge_file, len_ptr ? *len_ptr + 1 : MAXPATHLEN);
 356                 fn_len = clean_fname(fn, CFN_COLLAPSE_DOT_DOT_DIRS);
 357         }
 358
 359         /* If the name isn't in buf yet, it wasn't absolute. */
 360         if (fn != buf) {
 361                 int d_len = dirbuf_len - prefix_skip;
 362                 if (d_len + fn_len >= MAXPATHLEN) {
 363                         rprintf(FERROR, "merge-file name overflows: %s\n", fn);
 364                         return NULL;
 365                 }
 366                 memcpy(buf, dirbuf + prefix_skip, d_len);
 367                 memcpy(buf + d_len, fn, fn_len + 1);
 368                 fn_len = clean_fname(buf, CFN_COLLAPSE_DOT_DOT_DIRS);
 369         }
 370
 371         if (len_ptr)
 372                 *len_ptr = fn_len;
 373         return buf;
 374 }
 375
 376 /* Sets the dirbuf and dirbuf_len values. */
 377 void set_filter_dir(const char *dir, unsigned int dirlen)
 378 {
 379         unsigned int len;
 380         if (*dir != '/') {
 381                 memcpy(dirbuf, curr_dir, curr_dir_len);
 382                 dirbuf[curr_dir_len] = '/';
 383                 len = curr_dir_len + 1;
 384                 if (len + dirlen >= MAXPATHLEN)
 385                         dirlen = 0;
 386         } else
 387                 len = 0;
 388         memcpy(dirbuf + len, dir, dirlen);
 389         dirbuf[dirlen + len] = '\0';
 390         dirbuf_len = clean_fname(dirbuf, CFN_COLLAPSE_DOT_DOT_DIRS);
 391         if (dirbuf_len > 1 && dirbuf[dirbuf_len-1] == '.'
 392             && dirbuf[dirbuf_len-2] == '/')
 393                 dirbuf_len -= 2;
 394         if (dirbuf_len != 1)
 395                 dirbuf[dirbuf_len++] = '/';
 396         dirbuf[dirbuf_len] = '\0';
 397         if (sanitize_paths)
 398                 dirbuf_depth = count_dir_elements(dirbuf + module_dirlen);
 399 }
 400
 401 /* This routine takes a per-dir merge-file entry and finishes its setup.
 402  * If the name has a path portion then we check to see if it refers to a
 403  * parent directory of the first transfer dir.  If it does, we scan all the
 404  * dirs from that point through the parent dir of the transfer dir looking
 405  * for the per-dir merge-file in each one. */
 406 static BOOL setup_merge_file(int mergelist_num, filter_rule *ex,
 407                              filter_rule_list *lp)
 408 {
 409         char buf[MAXPATHLEN];
 410         char *x, *y, *pat = ex->pattern;
 411         unsigned int len;
 412
 413         if (!(x = parse_merge_name(pat, NULL, 0)) || *x != '/')
 414                 return 0;
 415
 416         if (DEBUG_GTE(FILTER, 2)) {
 417                 rprintf(FINFO, "[%s] performing parent_dirscan for mergelist #%d%s\n",
 418                         who_am_i(), mergelist_num, lp->debug_type);
 419         }
 420         y = strrchr(x, '/');
 421         *y = '\0';
 422         ex->pattern = strdup(y+1);
 423         if (!*x)
 424                 x = "/";
 425         if (*x == '/')
 426                 strlcpy(buf, x, MAXPATHLEN);
 427         else
 428                 pathjoin(buf, MAXPATHLEN, dirbuf, x);
 429
 430         len = clean_fname(buf, CFN_COLLAPSE_DOT_DOT_DIRS);
 431         if (len != 1 && len < MAXPATHLEN-1) {
 432                 buf[len++] = '/';
 433                 buf[len] = '\0';
 434         }
 435         /* This ensures that the specified dir is a parent of the transfer. */
 436         for (x = buf, y = dirbuf; *x && *x == *y; x++, y++) {}
 437         if (*x)
 438                 y += strlen(y); /* nope -- skip the scan */
 439
 440         parent_dirscan = True;
 441         while (*y) {
 442                 char save[MAXPATHLEN];
 443                 strlcpy(save, y, MAXPATHLEN);
 444                 *y = '\0';
 445                 dirbuf_len = y - dirbuf;
 446                 strlcpy(x, ex->pattern, MAXPATHLEN - (x - buf));
 447                 parse_filter_file(lp, buf, ex, XFLG_ANCHORED2ABS);
 448                 if (ex->rflags & FILTRULE_NO_INHERIT) {
 449                         /* Free the undesired rules to clean up any per-dir
 450                          * mergelists they defined.  Otherwise pop_local_filters
 451                          * may crash trying to restore nonexistent state for
 452                          * those mergelists. */
 453                         free_filters(lp->head);
 454                         lp->head = NULL;
 455                 }
 456                 lp->tail = NULL;
 457                 strlcpy(y, save, MAXPATHLEN);
 458                 while ((*x++ = *y++) != '/') {}
 459         }
 460         /* Save current head for freeing when the mergelist becomes inactive. */
 461         lp->parent_dirscan_head = lp->head;
 462         parent_dirscan = False;
 463         if (DEBUG_GTE(FILTER, 2)) {
 464                 rprintf(FINFO, "[%s] completed parent_dirscan for mergelist #%d%s\n",
 465                         who_am_i(), mergelist_num, lp->debug_type);
 466         }
 467         free(pat);
 468         return 1;
 469 }
 470
 471 struct local_filter_state {
 472         int mergelist_cnt;
 473         filter_rule_list mergelists[1];
 474 };
 475
 476 /* Each time rsync changes to a new directory it call this function to
 477  * handle all the per-dir merge-files.  The "dir" value is the current path
 478  * relative to curr_dir (which might not be null-terminated).  We copy it
 479  * into dirbuf so that we can easily append a file name on the end. */
 480 void *push_local_filters(const char *dir, unsigned int dirlen)
 481 {
 482         struct local_filter_state *push;
 483         int i;
 484
 485         set_filter_dir(dir, dirlen);
 486         if (DEBUG_GTE(FILTER, 2)) {
 487                 rprintf(FINFO, "[%s] pushing local filters for %s\n",
 488                         who_am_i(), dirbuf);
 489         }
 490
 491         if (!mergelist_cnt) {
 492                 /* No old state to save and no new merge files to push. */
 493                 return NULL;
 494         }
 495
 496         push = (struct local_filter_state *)new_array(char,
 497                           sizeof (struct local_filter_state)
 498                         + (mergelist_cnt-1) * sizeof (filter_rule_list));
 499         if (!push)
 500                 out_of_memory("push_local_filters");
 501
 502         push->mergelist_cnt = mergelist_cnt;
 503         for (i = 0; i < mergelist_cnt; i++) {
 504                 memcpy(&push->mergelists[i], mergelist_parents[i]->u.mergelist,
 505                        sizeof (filter_rule_list));
 506         }
 507
 508         /* Note: parse_filter_file() might increase mergelist_cnt, so keep
 509          * this loop separate from the above loop. */
 510         for (i = 0; i < mergelist_cnt; i++) {
 511                 filter_rule *ex = mergelist_parents[i];
 512                 filter_rule_list *lp = ex->u.mergelist;
 513
 514                 if (DEBUG_GTE(FILTER, 2)) {
 515                         rprintf(FINFO, "[%s] pushing mergelist #%d%s\n",
 516                                 who_am_i(), i, lp->debug_type);
 517                 }
 518
 519                 lp->tail = NULL; /* Switch any local rules to inherited. */
 520                 if (ex->rflags & FILTRULE_NO_INHERIT)
 521                         lp->head = NULL;
 522
 523                 if (ex->rflags & FILTRULE_FINISH_SETUP) {
 524                         ex->rflags &= ~FILTRULE_FINISH_SETUP;
 525                         if (setup_merge_file(i, ex, lp))
 526                                 set_filter_dir(dir, dirlen);
 527                 }
 528
 529                 if (strlcpy(dirbuf + dirbuf_len, ex->pattern,
 530                     MAXPATHLEN - dirbuf_len) < MAXPATHLEN - dirbuf_len) {
 531                         parse_filter_file(lp, dirbuf, ex,
 532                                           XFLG_ANCHORED2ABS);
 533                 } else {
 534                         io_error |= IOERR_GENERAL;
 535                         rprintf(FERROR,
 536                             "cannot add local filter rules in long-named directory: %s\n",
 537                             full_fname(dirbuf));
 538                 }
 539                 dirbuf[dirbuf_len] = '\0';
 540         }
 541
 542         return (void*)push;
 543 }
 544
 545 void pop_local_filters(void *mem)
 546 {
 547         struct local_filter_state *pop = (struct local_filter_state *)mem;
 548         int i;
 549         int old_mergelist_cnt = pop ? pop->mergelist_cnt : 0;
 550
 551         if (DEBUG_GTE(FILTER, 2))
 552                 rprintf(FINFO, "[%s] popping local filters\n", who_am_i());
 553
 554         for (i = mergelist_cnt; i-- > 0; ) {
 555                 filter_rule *ex = mergelist_parents[i];
 556                 filter_rule_list *lp = ex->u.mergelist;
 557
 558                 if (DEBUG_GTE(FILTER, 2)) {
 559                         rprintf(FINFO, "[%s] popping mergelist #%d%s\n",
 560                                 who_am_i(), i, lp->debug_type);
 561                 }
 562
 563                 clear_filter_list(lp);
 564
 565                 if (i >= old_mergelist_cnt) {
 566                         /* This mergelist does not exist in the state to be
 567                          * restored.  Free its parent_dirscan list to clean up
 568                          * any per-dir mergelists defined there so we don't
 569                          * crash trying to restore nonexistent state for them
 570                          * below.  (Counterpart to setup_merge_file call in
 571                          * push_local_filters.  Must be done here, not in
 572                          * free_filter, for LIFO order.) */
 573                         if (DEBUG_GTE(FILTER, 2)) {
 574                                 rprintf(FINFO, "[%s] freeing parent_dirscan filters of mergelist #%d%s\n",
 575                                         who_am_i(), i, ex->u.mergelist->debug_type);
 576                         }
 577                         free_filters(lp->parent_dirscan_head);
 578                         lp->parent_dirscan_head = NULL;
 579                 }
 580         }
 581
 582         /* If we cleaned things up properly, the only still-active mergelists
 583          * should be those with a state to be restored. */
 584         assert(mergelist_cnt == old_mergelist_cnt);
 585
 586         if (!pop) {
 587                 /* No state to restore. */
 588                 return;
 589         }
 590
 591         for (i = 0; i < mergelist_cnt; i++) {
 592                 memcpy(mergelist_parents[i]->u.mergelist, &pop->mergelists[i],
 593                        sizeof (filter_rule_list));
 594         }
 595
 596         free(pop);
 597 }
 598
 599 void change_local_filter_dir(const char *dname, int dlen, int dir_depth)
 600 {
 601         static int cur_depth = -1;
 602         static void *filt_array[MAXPATHLEN/2+1];
 603
 604         if (!dname) {
 605                 for ( ; cur_depth >= 0; cur_depth--) {
 606                         if (filt_array[cur_depth]) {
 607                                 pop_local_filters(filt_array[cur_depth]);
 608                                 filt_array[cur_depth] = NULL;
 609                         }
 610                 }
 611                 return;
 612         }
 613
 614         assert(dir_depth < MAXPATHLEN/2+1);
 615
 616         for ( ; cur_depth >= dir_depth; cur_depth--) {
 617                 if (filt_array[cur_depth]) {
 618                         pop_local_filters(filt_array[cur_depth]);
 619                         filt_array[cur_depth] = NULL;
 620                 }
 621         }
 622
 623         cur_depth = dir_depth;
 624         filt_array[cur_depth] = push_local_filters(dname, dlen);
 625 }
 626
 627 static int rule_matches(const char *fname, filter_rule *ex, int name_is_dir)
 628 {
 629         int slash_handling, str_cnt = 0, anchored_match = 0;
 630         int ret_match = ex->rflags & FILTRULE_NEGATE ? 0 : 1;
 631         char *p, *pattern = ex->pattern;
 632         const char *strings[16]; /* more than enough */
 633         const char *name = fname + (*fname == '/');
 634
 635         if (!*name)
 636                 return 0;
 637
 638         if (!ex->u.slash_cnt && !(ex->rflags & FILTRULE_WILD2)) {
 639                 /* If the pattern does not have any slashes AND it does
 640                  * not have a "**" (which could match a slash), then we
 641                  * just match the name portion of the path. */
 642                 if ((p = strrchr(name,'/')) != NULL)
 643                         name = p+1;
 644         } else if (ex->rflags & FILTRULE_ABS_PATH && *fname != '/'
 645             && curr_dir_len > module_dirlen + 1) {
 646                 /* If we're matching against an absolute-path pattern,
 647                  * we need to prepend our full path info. */
 648                 strings[str_cnt++] = curr_dir + module_dirlen + 1;
 649                 strings[str_cnt++] = "/";
 650         } else if (ex->rflags & FILTRULE_WILD2_PREFIX && *fname != '/') {
 651                 /* Allow "**"+"/" to match at the start of the string. */
 652                 strings[str_cnt++] = "/";
 653         }
 654         strings[str_cnt++] = name;
 655         if (name_is_dir) {
 656                 /* Allow a trailing "/"+"***" to match the directory. */
 657                 if (ex->rflags & FILTRULE_WILD3_SUFFIX)
 658                         strings[str_cnt++] = "/";
 659         } else if (ex->rflags & FILTRULE_DIRECTORY)
 660                 return !ret_match;
 661         strings[str_cnt] = NULL;
 662
 663         if (*pattern == '/') {
 664                 anchored_match = 1;
 665                 pattern++;
 666         }
 667
 668         if (!anchored_match && ex->u.slash_cnt
 669             && !(ex->rflags & FILTRULE_WILD2)) {
 670                 /* A non-anchored match with an infix slash and no "**"
 671                  * needs to match the last slash_cnt+1 name elements. */
 672                 slash_handling = ex->u.slash_cnt + 1;
 673         } else if (!anchored_match && !(ex->rflags & FILTRULE_WILD2_PREFIX)
 674                                    && ex->rflags & FILTRULE_WILD2) {
 675                 /* A non-anchored match with an infix or trailing "**" (but not
 676                  * a prefixed "**") needs to try matching after every slash. */
 677                 slash_handling = -1;
 678         } else {
 679                 /* The pattern matches only at the start of the path or name. */
 680                 slash_handling = 0;
 681         }
 682
 683         if (ex->rflags & FILTRULE_WILD) {
 684                 if (wildmatch_array(pattern, strings, slash_handling))
 685                         return ret_match;
 686         } else if (str_cnt > 1) {
 687                 if (litmatch_array(pattern, strings, slash_handling))
 688                         return ret_match;
 689         } else if (anchored_match) {
 690                 if (strcmp(name, pattern) == 0)
 691                         return ret_match;
 692         } else {
 693                 int l1 = strlen(name);
 694                 int l2 = strlen(pattern);
 695                 if (l2 <= l1 &&
 696                     strcmp(name+(l1-l2),pattern) == 0 &&
 697                     (l1==l2 || name[l1-(l2+1)] == '/')) {
 698                         return ret_match;
 699                 }
 700         }
 701
 702         return !ret_match;
 703 }
 704
 705 static void report_filter_result(enum logcode code, char const *name,
 706                                  filter_rule const *ent,
 707                                  int name_is_dir, const char *type)
 708 {
 709         /* If a trailing slash is present to match only directories,
 710          * then it is stripped out by add_rule().  So as a special
 711          * case we add it back in here. */
 712
 713         if (DEBUG_GTE(FILTER, 1)) {
 714                 static char *actions[2][2]
 715                     = { {"show", "hid"}, {"risk", "protect"} };
 716                 const char *w = who_am_i();
 717                 rprintf(code, "[%s] %sing %s %s because of pattern %s%s%s\n",
 718                     w, actions[*w!='s'][!(ent->rflags & FILTRULE_INCLUDE)],
 719                     name_is_dir ? "directory" : "file", name, ent->pattern,
 720                     ent->rflags & FILTRULE_DIRECTORY ? "/" : "", type);
 721         }
 722 }
 723
 724 /* Return -1 if file "name" is defined to be excluded by the specified
 725  * exclude list, 1 if it is included, and 0 if it was not matched. */
 726 int check_filter(filter_rule_list *listp, enum logcode code,
 727                  const char *name, int name_is_dir)
 728 {
 729         filter_rule *ent;
 730
 731         for (ent = listp->head; ent; ent = ent->next) {
 732                 if (ignore_perishable && ent->rflags & FILTRULE_PERISHABLE)
 733                         continue;
 734                 if (ent->rflags & FILTRULE_PERDIR_MERGE) {
 735                         int rc = check_filter(ent->u.mergelist, code, name,
 736                                               name_is_dir);
 737                         if (rc)
 738                                 return rc;
 739                         continue;
 740                 }
 741                 if (ent->rflags & FILTRULE_CVS_IGNORE) {
 742                         int rc = check_filter(&cvs_filter_list, code, name,
 743                                               name_is_dir);
 744                         if (rc)
 745                                 return rc;
 746                         continue;
 747                 }
 748                 if (rule_matches(name, ent, name_is_dir)) {
 749                         report_filter_result(code, name, ent, name_is_dir,
 750                                              listp->debug_type);
 751                         return ent->rflags & FILTRULE_INCLUDE ? 1 : -1;
 752                 }
 753         }
 754
 755         return 0;
 756 }
 757
 758 #define RULE_STRCMP(s,r) rule_strcmp((s), (r), sizeof (r) - 1)
 759
 760 static const uchar *rule_strcmp(const uchar *str, const char *rule, int rule_len)
 761 {
 762         if (strncmp((char*)str, rule, rule_len) != 0)
 763                 return NULL;
 764         if (isspace(str[rule_len]) || str[rule_len] == '_' || !str[rule_len])
 765                 return str + rule_len - 1;
 766         if (str[rule_len] == ',')
 767                 return str + rule_len;
 768         return NULL;
 769 }
 770
 771 #define FILTRULES_FROM_CONTAINER (FILTRULE_ABS_PATH | FILTRULE_INCLUDE \
 772                                 | FILTRULE_DIRECTORY | FILTRULE_NEGATE \
 773                                 | FILTRULE_PERISHABLE)
 774
 775 /* Gets the next include/exclude rule from *rulestr_ptr and advances
 776  * *rulestr_ptr to point beyond it.  Stores the pattern's start (within
 777  * *rulestr_ptr) and length in *pat_ptr and *pat_len_ptr, and returns a newly
 778  * allocated filter_rule containing the rest of the information.  Returns
 779  * NULL if there are no more rules in the input.
 780  *
 781  * The template provides defaults for the new rule to inherit, and the
 782  * template rflags and the xflags additionally affect parsing. */
 783 static filter_rule *parse_rule_tok(const char **rulestr_ptr,
 784                                    const filter_rule *template, int xflags,
 785                                    const char **pat_ptr, unsigned int *pat_len_ptr)
 786 {
 787         const uchar *s = (const uchar *)*rulestr_ptr;
 788         filter_rule *rule;
 789         unsigned int len;
 790
 791         if (template->rflags & FILTRULE_WORD_SPLIT) {
 792                 /* Skip over any initial whitespace. */
 793                 while (isspace(*s))
 794                         s++;
 795                 /* Update to point to real start of rule. */
 796                 *rulestr_ptr = (const char *)s;
 797         }
 798         if (!*s)
 799                 return NULL;
 800
 801         if (!(rule = new0(filter_rule)))
 802                 out_of_memory("parse_rule_tok");
 803
 804         /* Inherit from the template.  Don't inherit FILTRULES_SIDES; we check
 805          * that later. */
 806         rule->rflags = template->rflags & FILTRULES_FROM_CONTAINER;
 807
 808         /* Figure out what kind of a filter rule "s" is pointing at.  Note
 809          * that if FILTRULE_NO_PREFIXES is set, the rule is either an include
 810          * or an exclude based on the inheritance of the FILTRULE_INCLUDE
 811          * flag (above).  XFLG_OLD_PREFIXES indicates a compatibility mode
 812          * for old include/exclude patterns where just "+ " and "- " are
 813          * allowed as optional prefixes.  */
 814         if (template->rflags & FILTRULE_NO_PREFIXES) {
 815                 if (*s == '!' && template->rflags & FILTRULE_CVS_IGNORE)
 816                         rule->rflags |= FILTRULE_CLEAR_LIST; /* Tentative! */
 817         } else if (xflags & XFLG_OLD_PREFIXES) {
 818                 if (*s == '-' && s[1] == ' ') {
 819                         rule->rflags &= ~FILTRULE_INCLUDE;
 820                         s += 2;
 821                 } else if (*s == '+' && s[1] == ' ') {
 822                         rule->rflags |= FILTRULE_INCLUDE;
 823                         s += 2;
 824                 } else if (*s == '!')
 825                         rule->rflags |= FILTRULE_CLEAR_LIST; /* Tentative! */
 826         } else {
 827                 char ch = 0;
 828                 BOOL prefix_specifies_side = False;
 829                 switch (*s) {
 830                 case 'c':
 831                         if ((s = RULE_STRCMP(s, "clear")) != NULL)
 832                                 ch = '!';
 833                         break;
 834                 case 'd':
 835                         if ((s = RULE_STRCMP(s, "dir-merge")) != NULL)
 836                                 ch = ':';
 837                         break;
 838                 case 'e':
 839                         if ((s = RULE_STRCMP(s, "exclude")) != NULL)
 840                                 ch = '-';
 841                         break;
 842                 case 'h':
 843                         if ((s = RULE_STRCMP(s, "hide")) != NULL)
 844                                 ch = 'H';
 845                         break;
 846                 case 'i':
 847                         if ((s = RULE_STRCMP(s, "include")) != NULL)
 848                                 ch = '+';
 849                         break;
 850                 case 'm':
 851                         if ((s = RULE_STRCMP(s, "merge")) != NULL)
 852                                 ch = '.';
 853                         break;
 854                 case 'p':
 855                         if ((s = RULE_STRCMP(s, "protect")) != NULL)
 856                                 ch = 'P';
 857                         break;
 858                 case 'r':
 859                         if ((s = RULE_STRCMP(s, "risk")) != NULL)
 860                                 ch = 'R';
 861                         break;
 862                 case 's':
 863                         if ((s = RULE_STRCMP(s, "show")) != NULL)
 864                                 ch = 'S';
 865                         break;
 866                 default:
 867                         ch = *s;
 868                         if (s[1] == ',')
 869                                 s++;
 870                         break;
 871                 }
 872                 switch (ch) {
 873                 case ':':
 874                         rule->rflags |= FILTRULE_PERDIR_MERGE
 875                                        | FILTRULE_FINISH_SETUP;
 876                         /* FALL THROUGH */
 877                 case '.':
 878                         rule->rflags |= FILTRULE_MERGE_FILE;
 879                         break;
 880                 case '+':
 881                         rule->rflags |= FILTRULE_INCLUDE;
 882                         break;
 883                 case '-':
 884                         break;
 885                 case 'S':
 886                         rule->rflags |= FILTRULE_INCLUDE;
 887                         /* FALL THROUGH */
 888                 case 'H':
 889                         rule->rflags |= FILTRULE_SENDER_SIDE;
 890                         prefix_specifies_side = True;
 891                         break;
 892                 case 'R':
 893                         rule->rflags |= FILTRULE_INCLUDE;
 894                         /* FALL THROUGH */
 895                 case 'P':
 896                         rule->rflags |= FILTRULE_RECEIVER_SIDE;
 897                         prefix_specifies_side = True;
 898                         break;
 899                 case '!':
 900                         rule->rflags |= FILTRULE_CLEAR_LIST;
 901                         break;
 902                 default:
 903                         rprintf(FERROR, "Unknown filter rule: `%s'\n", *rulestr_ptr);
 904                         exit_cleanup(RERR_SYNTAX);
 905                 }
 906                 while (ch != '!' && *++s && *s != ' ' && *s != '_') {
 907                         if (template->rflags & FILTRULE_WORD_SPLIT && isspace(*s)) {
 908                                 s--;
 909                                 break;
 910                         }
 911                         switch (*s) {
 912                         default:
 913                             invalid:
 914                                 rprintf(FERROR,
 915                                         "invalid modifier '%c' at position %d in filter rule: %s\n",
 916                                         *s, (int)(s - (const uchar *)*rulestr_ptr), *rulestr_ptr);
 917                                 exit_cleanup(RERR_SYNTAX);
 918                         case '-':
 919                                 if (!BITS_SETnUNSET(rule->rflags, FILTRULE_MERGE_FILE, FILTRULE_NO_PREFIXES))
 920                                         goto invalid;
 921                                 rule->rflags |= FILTRULE_NO_PREFIXES;
 922                                 break;
 923                         case '+':
 924                                 if (!BITS_SETnUNSET(rule->rflags, FILTRULE_MERGE_FILE, FILTRULE_NO_PREFIXES))
 925                                         goto invalid;
 926                                 rule->rflags |= FILTRULE_NO_PREFIXES
 927                                               | FILTRULE_INCLUDE;
 928                                 break;
 929                         case '/':
 930                                 rule->rflags |= FILTRULE_ABS_PATH;
 931                                 break;
 932                         case '!':
 933                                 /* Negation really goes with the pattern, so it
 934                                  * isn't useful as a merge-file default. */
 935                                 if (rule->rflags & FILTRULE_MERGE_FILE)
 936                                         goto invalid;
 937                                 rule->rflags |= FILTRULE_NEGATE;
 938                                 break;
 939                         case 'C':
 940                                 if (rule->rflags & FILTRULE_NO_PREFIXES || prefix_specifies_side)
 941                                         goto invalid;
 942                                 rule->rflags |= FILTRULE_NO_PREFIXES
 943                                               | FILTRULE_WORD_SPLIT
 944                                               | FILTRULE_NO_INHERIT
 945                                               | FILTRULE_CVS_IGNORE;
 946                                 break;
 947                         case 'e':
 948                                 if (!(rule->rflags & FILTRULE_MERGE_FILE))
 949                                         goto invalid;
 950                                 rule->rflags |= FILTRULE_EXCLUDE_SELF;
 951                                 break;
 952                         case 'n':
 953                                 if (!(rule->rflags & FILTRULE_MERGE_FILE))
 954                                         goto invalid;
 955                                 rule->rflags |= FILTRULE_NO_INHERIT;
 956                                 break;
 957                         case 'p':
 958                                 rule->rflags |= FILTRULE_PERISHABLE;
 959                                 break;
 960                         case 'r':
 961                                 if (prefix_specifies_side)
 962                                         goto invalid;
 963                                 rule->rflags |= FILTRULE_RECEIVER_SIDE;
 964                                 break;
 965                         case 's':
 966                                 if (prefix_specifies_side)
 967                                         goto invalid;
 968                                 rule->rflags |= FILTRULE_SENDER_SIDE;
 969                                 break;
 970                         case 'w':
 971                                 if (!(rule->rflags & FILTRULE_MERGE_FILE))
 972                                         goto invalid;
 973                                 rule->rflags |= FILTRULE_WORD_SPLIT;
 974                                 break;
 975                         }
 976                 }
 977                 if (*s)
 978                         s++;
 979         }
 980         if (template->rflags & FILTRULES_SIDES) {
 981                 if (rule->rflags & FILTRULES_SIDES) {
 982                         /* The filter and template both specify side(s).  This
 983                          * is dodgy (and won't work correctly if the template is
 984                          * a one-sided per-dir merge rule), so reject it. */
 985                         rprintf(FERROR,
 986                                 "specified-side merge file contains specified-side filter: %s\n",
 987                                 *rulestr_ptr);
 988                         exit_cleanup(RERR_SYNTAX);
 989                 }
 990                 rule->rflags |= template->rflags & FILTRULES_SIDES;
 991         }
 992
 993         if (template->rflags & FILTRULE_WORD_SPLIT) {
 994                 const uchar *cp = s;
 995                 /* Token ends at whitespace or the end of the string. */
 996                 while (!isspace(*cp) && *cp != '\0')
 997                         cp++;
 998                 len = cp - s;
 999         } else
1000                 len = strlen((char*)s);
1001
1002         if (rule->rflags & FILTRULE_CLEAR_LIST) {
1003                 if (!(rule->rflags & FILTRULE_NO_PREFIXES)
1004                  && !(xflags & XFLG_OLD_PREFIXES) && len) {
1005                         rprintf(FERROR,
1006                                 "'!' rule has trailing characters: %s\n", *rulestr_ptr);
1007                         exit_cleanup(RERR_SYNTAX);
1008                 }
1009                 if (len > 1)
1010                         rule->rflags &= ~FILTRULE_CLEAR_LIST;
1011         } else if (!len && !(rule->rflags & FILTRULE_CVS_IGNORE)) {
1012                 rprintf(FERROR, "unexpected end of filter rule: %s\n", *rulestr_ptr);
1013                 exit_cleanup(RERR_SYNTAX);
1014         }
1015
1016         /* --delete-excluded turns an un-modified include/exclude into a sender-side rule.  */
1017         if (delete_excluded
1018          && !(rule->rflags & (FILTRULES_SIDES|FILTRULE_MERGE_FILE|FILTRULE_PERDIR_MERGE)))
1019                 rule->rflags |= FILTRULE_SENDER_SIDE;
1020
1021         *pat_ptr = (const char *)s;
1022         *pat_len_ptr = len;
1023         *rulestr_ptr = *pat_ptr + len;
1024         return rule;
1025 }
1026
1027 static char default_cvsignore[] =
1028         /* These default ignored items come from the CVS manual. */
1029         "RCS SCCS CVS CVS.adm RCSLOG cvslog.* tags TAGS"
1030         " .make.state .nse_depinfo *~ #* .#* ,* _$* *$"
1031         " *.old *.bak *.BAK *.orig *.rej .del-*"
1032         " *.a *.olb *.o *.obj *.so *.exe"
1033         " *.Z *.elc *.ln core"
1034         /* The rest we added to suit ourself. */
1035         " .svn/ .git/ .hg/ .bzr/";
1036
1037 static void get_cvs_excludes(uint32 rflags)
1038 {
1039         static int initialized = 0;
1040         char *p, fname[MAXPATHLEN];
1041
1042         if (initialized)
1043                 return;
1044         initialized = 1;
1045
1046         parse_filter_str(&cvs_filter_list, default_cvsignore,
1047                          rule_template(rflags | (protocol_version >= 30 ? FILTRULE_PERISHABLE : 0)),
1048                          0);
1049
1050         p = module_id >= 0 && lp_use_chroot(module_id) ? "/" : getenv("HOME");
1051         if (p && pathjoin(fname, MAXPATHLEN, p, ".cvsignore") < MAXPATHLEN)
1052                 parse_filter_file(&cvs_filter_list, fname, rule_template(rflags), 0);
1053
1054         parse_filter_str(&cvs_filter_list, getenv("CVSIGNORE"), rule_template(rflags), 0);
1055 }
1056
1057 const filter_rule *rule_template(uint32 rflags)
1058 {
1059         static filter_rule template; /* zero-initialized */
1060         template.rflags = rflags;
1061         return &template;
1062 }
1063
1064 void parse_filter_str(filter_rule_list *listp, const char *rulestr,
1065                      const filter_rule *template, int xflags)
1066 {
1067         filter_rule *rule;
1068         const char *pat;
1069         unsigned int pat_len;
1070
1071         if (!rulestr)
1072                 return;
1073
1074         while (1) {
1075                 uint32 new_rflags;
1076
1077                 /* Remember that the returned string is NOT '\0' terminated! */
1078                 if (!(rule = parse_rule_tok(&rulestr, template, xflags, &pat, &pat_len)))
1079                         break;
1080
1081                 if (pat_len >= MAXPATHLEN) {
1082                         rprintf(FERROR, "discarding over-long filter: %.*s\n",
1083                                 (int)pat_len, pat);
1084                     free_continue:
1085                         free_filter(rule);
1086                         continue;
1087                 }
1088
1089                 new_rflags = rule->rflags;
1090                 if (new_rflags & FILTRULE_CLEAR_LIST) {
1091                         if (DEBUG_GTE(FILTER, 2)) {
1092                                 rprintf(FINFO,
1093                                         "[%s] clearing filter list%s\n",
1094                                         who_am_i(), listp->debug_type);
1095                         }
1096                         clear_filter_list(listp);
1097                         goto free_continue;
1098                 }
1099
1100                 if (new_rflags & FILTRULE_MERGE_FILE) {
1101                         if (!pat_len) {
1102                                 pat = ".cvsignore";
1103                                 pat_len = 10;
1104                         }
1105                         if (new_rflags & FILTRULE_EXCLUDE_SELF) {
1106                                 const char *name;
1107                                 filter_rule *excl_self;
1108
1109                                 if (!(excl_self = new0(filter_rule)))
1110                                         out_of_memory("parse_filter_str");
1111                                 /* Find the beginning of the basename and add an exclude for it. */
1112                                 for (name = pat + pat_len; name > pat && name[-1] != '/'; name--) {}
1113                                 add_rule(listp, name, (pat + pat_len) - name, excl_self, 0);
1114                                 rule->rflags &= ~FILTRULE_EXCLUDE_SELF;
1115                         }
1116                         if (new_rflags & FILTRULE_PERDIR_MERGE) {
1117                                 if (parent_dirscan) {
1118                                         const char *p;
1119                                         unsigned int len = pat_len;
1120                                         if ((p = parse_merge_name(pat, &len, module_dirlen)))
1121                                                 add_rule(listp, p, len, rule, 0);
1122                                         else
1123                                                 free_filter(rule);
1124                                         continue;
1125                                 }
1126                         } else {
1127                                 const char *p;
1128                                 unsigned int len = pat_len;
1129                                 if ((p = parse_merge_name(pat, &len, 0)))
1130                                         parse_filter_file(listp, p, rule, XFLG_FATAL_ERRORS);
1131                                 free_filter(rule);
1132                                 continue;
1133                         }
1134                 }
1135
1136                 add_rule(listp, pat, pat_len, rule, xflags);
1137
1138                 if (new_rflags & FILTRULE_CVS_IGNORE
1139                     && !(new_rflags & FILTRULE_MERGE_FILE))
1140                         get_cvs_excludes(new_rflags);
1141         }
1142 }
1143
1144 void parse_filter_file(filter_rule_list *listp, const char *fname, const filter_rule *template, int xflags)
1145 {
1146         FILE *fp;
1147         char line[BIGPATHBUFLEN];
1148         char *eob = line + sizeof line - 1;
1149         BOOL word_split = (template->rflags & FILTRULE_WORD_SPLIT) != 0;
1150
1151         if (!fname || !*fname)
1152                 return;
1153
1154         if (*fname != '-' || fname[1] || am_server) {
1155                 if (daemon_filter_list.head) {
1156                         strlcpy(line, fname, sizeof line);
1157                         clean_fname(line, CFN_COLLAPSE_DOT_DOT_DIRS);
1158                         if (check_filter(&daemon_filter_list, FLOG, line, 0) < 0)
1159                                 fp = NULL;
1160                         else
1161                                 fp = fopen(line, "rb");
1162                 } else
1163                         fp = fopen(fname, "rb");
1164         } else
1165                 fp = stdin;
1166
1167         if (DEBUG_GTE(FILTER, 2)) {
1168                 rprintf(FINFO, "[%s] parse_filter_file(%s,%x,%x)%s\n",
1169                         who_am_i(), fname, template->rflags, xflags,
1170                         fp ? "" : " [not found]");
1171         }
1172
1173         if (!fp) {
1174                 if (xflags & XFLG_FATAL_ERRORS) {
1175                         rsyserr(FERROR, errno,
1176                                 "failed to open %sclude file %s",
1177                                 template->rflags & FILTRULE_INCLUDE ? "in" : "ex",
1178                                 fname);
1179                         exit_cleanup(RERR_FILEIO);
1180                 }
1181                 return;
1182         }
1183         dirbuf[dirbuf_len] = '\0';
1184
1185         while (1) {
1186                 char *s = line;
1187                 int ch, overflow = 0;
1188                 while (1) {
1189                         if ((ch = getc(fp)) == EOF) {
1190                                 if (ferror(fp) && errno == EINTR) {
1191                                         clearerr(fp);
1192                                         continue;
1193                                 }
1194                                 break;
1195                         }
1196                         if (word_split && isspace(ch))
1197                                 break;
1198                         if (eol_nulls? !ch : (ch == '\n' || ch == '\r'))
1199                                 break;
1200                         if (s < eob)
1201                                 *s++ = ch;
1202                         else
1203                                 overflow = 1;
1204                 }
1205                 if (overflow) {
1206                         rprintf(FERROR, "discarding over-long filter: %s...\n", line);
1207                         s = line;
1208                 }
1209                 *s = '\0';
1210                 /* Skip an empty token and (when line parsing) comments. */
1211                 if (*line && (word_split || (*line != ';' && *line != '#')))
1212                         parse_filter_str(listp, line, template, xflags);
1213                 if (ch == EOF)
1214                         break;
1215         }
1216         fclose(fp);
1217 }
1218
1219 /* If the "for_xfer" flag is set, the prefix is made compatible with the
1220  * current protocol_version (if possible) or a NULL is returned (if not
1221  * possible). */
1222 char *get_rule_prefix(filter_rule *rule, const char *pat, int for_xfer,
1223                       unsigned int *plen_ptr)
1224 {
1225         static char buf[MAX_RULE_PREFIX+1];
1226         char *op = buf;
1227         int legal_len = for_xfer && protocol_version < 29 ? 1 : MAX_RULE_PREFIX-1;
1228
1229         if (rule->rflags & FILTRULE_PERDIR_MERGE) {
1230                 if (legal_len == 1)
1231                         return NULL;
1232                 *op++ = ':';
1233         } else if (rule->rflags & FILTRULE_INCLUDE)
1234                 *op++ = '+';
1235         else if (legal_len != 1
1236             || ((*pat == '-' || *pat == '+') && pat[1] == ' '))
1237                 *op++ = '-';
1238         else
1239                 legal_len = 0;
1240
1241         if (rule->rflags & FILTRULE_ABS_PATH)
1242                 *op++ = '/';
1243         if (rule->rflags & FILTRULE_NEGATE)
1244                 *op++ = '!';
1245         if (rule->rflags & FILTRULE_CVS_IGNORE)
1246                 *op++ = 'C';
1247         else {
1248                 if (rule->rflags & FILTRULE_NO_INHERIT)
1249                         *op++ = 'n';
1250                 if (rule->rflags & FILTRULE_WORD_SPLIT)
1251                         *op++ = 'w';
1252                 if (rule->rflags & FILTRULE_NO_PREFIXES) {
1253                         if (rule->rflags & FILTRULE_INCLUDE)
1254                                 *op++ = '+';
1255                         else
1256                                 *op++ = '-';
1257                 }
1258         }
1259         if (rule->rflags & FILTRULE_EXCLUDE_SELF)
1260                 *op++ = 'e';
1261         if (rule->rflags & FILTRULE_SENDER_SIDE
1262             && (!for_xfer || protocol_version >= 29))
1263                 *op++ = 's';
1264         if (rule->rflags & FILTRULE_RECEIVER_SIDE
1265             && (!for_xfer || protocol_version >= 29
1266              || (delete_excluded && am_sender)))
1267                 *op++ = 'r';
1268         if (rule->rflags & FILTRULE_PERISHABLE) {
1269                 if (!for_xfer || protocol_version >= 30)
1270                         *op++ = 'p';
1271                 else if (am_sender)
1272                         return NULL;
1273         }
1274         if (op - buf > legal_len)
1275                 return NULL;
1276         if (legal_len)
1277                 *op++ = ' ';
1278         *op = '\0';
1279         if (plen_ptr)
1280                 *plen_ptr = op - buf;
1281         return buf;
1282 }
1283
1284 static void send_rules(int f_out, filter_rule_list *flp)
1285 {
1286         filter_rule *ent, *prev = NULL;
1287
1288         for (ent = flp->head; ent; ent = ent->next) {
1289                 unsigned int len, plen, dlen;
1290                 int elide = 0;
1291                 char *p;
1292
1293                 /* Note we need to check delete_excluded here in addition to
1294                  * the code in parse_rule_tok() because some rules may have
1295                  * been added before we found the --delete-excluded option.
1296                  * We must also elide any CVS merge-file rules to avoid a
1297                  * backward compatibility problem, and we elide any no-prefix
1298                  * merge files as an optimization (since they can only have
1299                  * include/exclude rules). */
1300                 if (ent->rflags & FILTRULE_SENDER_SIDE)
1301                         elide = am_sender ? 1 : -1;
1302                 if (ent->rflags & FILTRULE_RECEIVER_SIDE)
1303                         elide = elide ? 0 : am_sender ? -1 : 1;
1304                 else if (delete_excluded && !elide
1305                  && (!(ent->rflags & FILTRULE_PERDIR_MERGE)
1306                   || ent->rflags & FILTRULE_NO_PREFIXES))
1307                         elide = am_sender ? 1 : -1;
1308                 if (elide < 0) {
1309                         if (prev)
1310                                 prev->next = ent->next;
1311                         else
1312                                 flp->head = ent->next;
1313                 } else
1314                         prev = ent;
1315                 if (elide > 0)
1316                         continue;
1317                 if (ent->rflags & FILTRULE_CVS_IGNORE
1318                     && !(ent->rflags & FILTRULE_MERGE_FILE)) {
1319                         int f = am_sender || protocol_version < 29 ? f_out : -2;
1320                         send_rules(f, &cvs_filter_list);
1321                         if (f == f_out)
1322                                 continue;
1323                 }
1324                 p = get_rule_prefix(ent, ent->pattern, 1, &plen);
1325                 if (!p) {
1326                         rprintf(FERROR,
1327                                 "filter rules are too modern for remote rsync.\n");
1328                         exit_cleanup(RERR_PROTOCOL);
1329                 }
1330                 if (f_out < 0)
1331                         continue;
1332                 len = strlen(ent->pattern);
1333                 dlen = ent->rflags & FILTRULE_DIRECTORY ? 1 : 0;
1334                 if (!(plen + len + dlen))
1335                         continue;
1336                 write_int(f_out, plen + len + dlen);
1337                 if (plen)
1338                         write_buf(f_out, p, plen);
1339                 write_buf(f_out, ent->pattern, len);
1340                 if (dlen)
1341                         write_byte(f_out, '/');
1342         }
1343         flp->tail = prev;
1344 }
1345
1346 /* This is only called by the client. */
1347 void send_filter_list(int f_out)
1348 {
1349         int receiver_wants_list = prune_empty_dirs
1350             || (delete_mode && (!delete_excluded || protocol_version >= 29));
1351
1352         if (local_server || (am_sender && !receiver_wants_list))
1353                 f_out = -1;
1354         if (cvs_exclude && am_sender) {
1355                 if (protocol_version >= 29)
1356                         parse_filter_str(&filter_list, ":C", rule_template(0), 0);
1357                 parse_filter_str(&filter_list, "-C", rule_template(0), 0);
1358         }
1359
1360         send_rules(f_out, &filter_list);
1361
1362         if (f_out >= 0)
1363                 write_int(f_out, 0);
1364
1365         if (cvs_exclude) {
1366                 if (!am_sender || protocol_version < 29)
1367                         parse_filter_str(&filter_list, ":C", rule_template(0), 0);
1368                 if (!am_sender)
1369                         parse_filter_str(&filter_list, "-C", rule_template(0), 0);
1370         }
1371 }
1372
1373 /* This is only called by the server. */
1374 void recv_filter_list(int f_in)
1375 {
1376         char line[BIGPATHBUFLEN];
1377         int xflags = protocol_version >= 29 ? 0 : XFLG_OLD_PREFIXES;
1378         int receiver_wants_list = prune_empty_dirs
1379             || (delete_mode
1380              && (!delete_excluded || protocol_version >= 29));
1381         unsigned int len;
1382
1383         if (!local_server && (am_sender || receiver_wants_list)) {
1384                 while ((len = read_int(f_in)) != 0) {
1385                         if (len >= sizeof line)
1386                                 overflow_exit("recv_rules");
1387                         read_sbuf(f_in, line, len);
1388                         parse_filter_str(&filter_list, line, rule_template(0), xflags);
1389                 }
1390         }
1391
1392         if (cvs_exclude) {
1393                 if (local_server || am_sender || protocol_version < 29)
1394                         parse_filter_str(&filter_list, ":C", rule_template(0), 0);
1395                 if (local_server || am_sender)
1396                         parse_filter_str(&filter_list, "-C", rule_template(0), 0);
1397         }
1398
1399         if (local_server) /* filter out any rules that aren't for us. */
1400                 send_rules(-1, &filter_list);
1401 }