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) 2003-2007 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 verbose;
  26 extern int am_server;
  27 extern int am_sender;
  28 extern int eol_nulls;
  29 extern int recurse;
  30 extern int io_error;
  31 extern int local_server;
  32 extern int prune_empty_dirs;
  33 extern int ignore_perishable;
  34 extern int delete_mode;
  35 extern int delete_excluded;
  36 extern int cvs_exclude;
  37 extern int sanitize_paths;
  38 extern int protocol_version;
  39 extern int module_id;
  40
  41 extern char curr_dir[];
  42 extern unsigned int curr_dir_len;
  43 extern unsigned int module_dirlen;
  44
  45 struct filter_list_struct filter_list = { 0, 0, "" };
  46 struct filter_list_struct cvs_filter_list = { 0, 0, " [global CVS]" };
  47 struct filter_list_struct server_filter_list = { 0, 0, " [daemon]" };
  48
  49 /* Need room enough for ":MODS " prefix plus some room to grow. */
  50 #define MAX_RULE_PREFIX (16)
  51
  52 #define MODIFIERS_MERGE_FILE "-+Cenw"
  53 #define MODIFIERS_INCL_EXCL "/!Crsp"
  54 #define MODIFIERS_HIDE_PROTECT "/!p"
  55
  56 /* The dirbuf is set by push_local_filters() to the current subdirectory
  57  * relative to curr_dir that is being processed.  The path always has a
  58  * trailing slash appended, and the variable dirbuf_len contains the length
  59  * of this path prefix.  The path is always absolute. */
  60 static char dirbuf[MAXPATHLEN+1];
  61 static unsigned int dirbuf_len = 0;
  62 static int dirbuf_depth;
  63
  64 /* This is True when we're scanning parent dirs for per-dir merge-files. */
  65 static BOOL parent_dirscan = False;
  66
  67 /* This array contains a list of all the currently active per-dir merge
  68  * files.  This makes it easier to save the appropriate values when we
  69  * "push" down into each subdirectory. */
  70 static struct filter_struct **mergelist_parents;
  71 static int mergelist_cnt = 0;
  72 static int mergelist_size = 0;
  73
  74 /* Each filter_list_struct describes a singly-linked list by keeping track
  75  * of both the head and tail pointers.  The list is slightly unusual in that
  76  * a parent-dir's content can be appended to the end of the local list in a
  77  * special way:  the last item in the local list has its "next" pointer set
  78  * to point to the inherited list, but the local list's tail pointer points
  79  * at the end of the local list.  Thus, if the local list is empty, the head
  80  * will be pointing at the inherited content but the tail will be NULL.  To
  81  * help you visualize this, here are the possible list arrangements:
  82  *
  83  * Completely Empty                     Local Content Only
  84  * ==================================   ====================================
  85  * head -> NULL                         head -> Local1 -> Local2 -> NULL
  86  * tail -> NULL                         tail -------------^
  87  *
  88  * Inherited Content Only               Both Local and Inherited Content
  89  * ==================================   ====================================
  90  * head -> Parent1 -> Parent2 -> NULL   head -> L1 -> L2 -> P1 -> P2 -> NULL
  91  * tail -> NULL                         tail ---------^
  92  *
  93  * This means that anyone wanting to traverse the whole list to use it just
  94  * needs to start at the head and use the "next" pointers until it goes
  95  * NULL.  To add new local content, we insert the item after the tail item
  96  * and update the tail (obviously, if "tail" was NULL, we insert it at the
  97  * head).  To clear the local list, WE MUST NOT FREE THE INHERITED CONTENT
  98  * because it is shared between the current list and our parent list(s).
  99  * The easiest way to handle this is to simply truncate the list after the
 100  * tail item and then free the local list from the head.  When inheriting
 101  * the list for a new local dir, we just save off the filter_list_struct
 102  * values (so we can pop back to them later) and set the tail to NULL.
 103  */
 104
 105 static void free_filter(struct filter_struct *ex)
 106 {
 107         if (ex->match_flags & MATCHFLG_PERDIR_MERGE) {
 108                 free(ex->u.mergelist->debug_type);
 109                 free(ex->u.mergelist);
 110                 mergelist_cnt--;
 111         }
 112         free(ex->pattern);
 113         free(ex);
 114 }
 115
 116 /* Build a filter structure given a filter pattern.  The value in "pat"
 117  * is not null-terminated. */
 118 static void add_rule(struct filter_list_struct *listp, const char *pat,
 119                      unsigned int pat_len, uint32 mflags, int xflags)
 120 {
 121         struct filter_struct *ret;
 122         const char *cp;
 123         unsigned int ex_len;
 124
 125         if (verbose > 2) {
 126                 rprintf(FINFO, "[%s] add_rule(%s%.*s%s)%s\n",
 127                         who_am_i(), get_rule_prefix(mflags, pat, 0, NULL),
 128                         (int)pat_len, pat,
 129                         (mflags & MATCHFLG_DIRECTORY) ? "/" : "",
 130                         listp->debug_type);
 131         }
 132
 133         /* These flags also indicate that we're reading a list that
 134          * needs to be filtered now, not post-filtered later. */
 135         if (xflags & (XFLG_ANCHORED2ABS|XFLG_ABS_IF_SLASH)) {
 136                 uint32 mf = mflags & (MATCHFLG_RECEIVER_SIDE|MATCHFLG_SENDER_SIDE);
 137                 if (am_sender) {
 138                         if (mf == MATCHFLG_RECEIVER_SIDE)
 139                                 return;
 140                 } else {
 141                         if (mf == MATCHFLG_SENDER_SIDE)
 142                                 return;
 143                 }
 144         }
 145
 146         if (!(ret = new0(struct filter_struct)))
 147                 out_of_memory("add_rule");
 148
 149         if (!(mflags & (MATCHFLG_ABS_PATH | MATCHFLG_MERGE_FILE))
 150          && ((xflags & (XFLG_ANCHORED2ABS|XFLG_ABS_IF_SLASH) && *pat == '/')
 151           || (xflags & XFLG_ABS_IF_SLASH && strchr(pat, '/') != NULL))) {
 152                 mflags |= MATCHFLG_ABS_PATH;
 153                 if (*pat == '/')
 154                         ex_len = dirbuf_len - module_dirlen - 1;
 155                 else
 156                         ex_len = 0;
 157         } else
 158                 ex_len = 0;
 159         if (!(ret->pattern = new_array(char, ex_len + pat_len + 1)))
 160                 out_of_memory("add_rule");
 161         if (ex_len)
 162                 memcpy(ret->pattern, dirbuf + module_dirlen, ex_len);
 163         strlcpy(ret->pattern + ex_len, pat, pat_len + 1);
 164         pat_len += ex_len;
 165
 166         if (strpbrk(ret->pattern, "*[?")) {
 167                 mflags |= MATCHFLG_WILD;
 168                 if ((cp = strstr(ret->pattern, "**")) != NULL) {
 169                         mflags |= MATCHFLG_WILD2;
 170                         /* If the pattern starts with **, note that. */
 171                         if (cp == ret->pattern)
 172                                 mflags |= MATCHFLG_WILD2_PREFIX;
 173                         /* If the pattern ends with ***, note that. */
 174                         if (pat_len >= 3
 175                          && ret->pattern[pat_len-3] == '*'
 176                          && ret->pattern[pat_len-2] == '*'
 177                          && ret->pattern[pat_len-1] == '*')
 178                                 mflags |= MATCHFLG_WILD3_SUFFIX;
 179                 }
 180         }
 181
 182         if (pat_len > 1 && ret->pattern[pat_len-1] == '/') {
 183                 ret->pattern[pat_len-1] = 0;
 184                 mflags |= MATCHFLG_DIRECTORY;
 185         }
 186
 187         if (mflags & MATCHFLG_PERDIR_MERGE) {
 188                 struct filter_list_struct *lp;
 189                 unsigned int len;
 190                 int i;
 191
 192                 if ((cp = strrchr(ret->pattern, '/')) != NULL)
 193                         cp++;
 194                 else
 195                         cp = ret->pattern;
 196
 197                 /* If the local merge file was already mentioned, don't
 198                  * add it again. */
 199                 for (i = 0; i < mergelist_cnt; i++) {
 200                         struct filter_struct *ex = mergelist_parents[i];
 201                         const char *s = strrchr(ex->pattern, '/');
 202                         if (s)
 203                                 s++;
 204                         else
 205                                 s = ex->pattern;
 206                         len = strlen(s);
 207                         if (len == pat_len - (cp - ret->pattern)
 208                             && memcmp(s, cp, len) == 0) {
 209                                 free_filter(ret);
 210                                 return;
 211                         }
 212                 }
 213
 214                 if (!(lp = new_array(struct filter_list_struct, 1)))
 215                         out_of_memory("add_rule");
 216                 lp->head = lp->tail = NULL;
 217                 if (asprintf(&lp->debug_type, " [per-dir %s]", cp) < 0)
 218                         out_of_memory("add_rule");
 219                 ret->u.mergelist = lp;
 220
 221                 if (mergelist_cnt == mergelist_size) {
 222                         mergelist_size += 5;
 223                         mergelist_parents = realloc_array(mergelist_parents,
 224                                                 struct filter_struct *,
 225                                                 mergelist_size);
 226                         if (!mergelist_parents)
 227                                 out_of_memory("add_rule");
 228                 }
 229                 mergelist_parents[mergelist_cnt++] = ret;
 230         } else {
 231                 for (cp = ret->pattern; (cp = strchr(cp, '/')) != NULL; cp++)
 232                         ret->u.slash_cnt++;
 233         }
 234
 235         ret->match_flags = mflags;
 236
 237         if (!listp->tail) {
 238                 ret->next = listp->head;
 239                 listp->head = listp->tail = ret;
 240         } else {
 241                 ret->next = listp->tail->next;
 242                 listp->tail->next = ret;
 243                 listp->tail = ret;
 244         }
 245 }
 246
 247 static void clear_filter_list(struct filter_list_struct *listp)
 248 {
 249         if (listp->tail) {
 250                 struct filter_struct *ent, *next;
 251                 /* Truncate any inherited items from the local list. */
 252                 listp->tail->next = NULL;
 253                 /* Now free everything that is left. */
 254                 for (ent = listp->head; ent; ent = next) {
 255                         next = ent->next;
 256                         free_filter(ent);
 257                 }
 258         }
 259
 260         listp->head = listp->tail = NULL;
 261 }
 262
 263 /* This returns an expanded (absolute) filename for the merge-file name if
 264  * the name has any slashes in it OR if the parent_dirscan var is True;
 265  * otherwise it returns the original merge_file name.  If the len_ptr value
 266  * is non-NULL the merge_file name is limited by the referenced length
 267  * value and will be updated with the length of the resulting name.  We
 268  * always return a name that is null terminated, even if the merge_file
 269  * name was not. */
 270 static char *parse_merge_name(const char *merge_file, unsigned int *len_ptr,
 271                               unsigned int prefix_skip)
 272 {
 273         static char buf[MAXPATHLEN];
 274         char *fn, tmpbuf[MAXPATHLEN];
 275         unsigned int fn_len;
 276
 277         if (!parent_dirscan && *merge_file != '/') {
 278                 /* Return the name unchanged it doesn't have any slashes. */
 279                 if (len_ptr) {
 280                         const char *p = merge_file + *len_ptr;
 281                         while (--p > merge_file && *p != '/') {}
 282                         if (p == merge_file) {
 283                                 strlcpy(buf, merge_file, *len_ptr + 1);
 284                                 return buf;
 285                         }
 286                 } else if (strchr(merge_file, '/') == NULL)
 287                         return (char *)merge_file;
 288         }
 289
 290         fn = *merge_file == '/' ? buf : tmpbuf;
 291         if (sanitize_paths) {
 292                 const char *r = prefix_skip ? "/" : NULL;
 293                 /* null-terminate the name if it isn't already */
 294                 if (len_ptr && merge_file[*len_ptr]) {
 295                         char *to = fn == buf ? tmpbuf : buf;
 296                         strlcpy(to, merge_file, *len_ptr + 1);
 297                         merge_file = to;
 298                 }
 299                 if (!sanitize_path(fn, merge_file, r, dirbuf_depth, NULL)) {
 300                         rprintf(FERROR, "merge-file name overflows: %s\n",
 301                                 merge_file);
 302                         return NULL;
 303                 }
 304                 fn_len = strlen(fn);
 305         } else {
 306                 strlcpy(fn, merge_file, len_ptr ? *len_ptr + 1 : MAXPATHLEN);
 307                 fn_len = clean_fname(fn, CFN_COLLAPSE_DOT_DOT_DIRS);
 308         }
 309
 310         /* If the name isn't in buf yet, it's wasn't absolute. */
 311         if (fn != buf) {
 312                 if (dirbuf_len + fn_len >= MAXPATHLEN) {
 313                         rprintf(FERROR, "merge-file name overflows: %s\n", fn);
 314                         return NULL;
 315                 }
 316                 memcpy(buf, dirbuf + prefix_skip, dirbuf_len - prefix_skip);
 317                 memcpy(buf + dirbuf_len - prefix_skip, fn, fn_len + 1);
 318                 fn_len = clean_fname(buf, CFN_COLLAPSE_DOT_DOT_DIRS);
 319         }
 320
 321         if (len_ptr)
 322                 *len_ptr = fn_len;
 323         return buf;
 324 }
 325
 326 /* Sets the dirbuf and dirbuf_len values. */
 327 void set_filter_dir(const char *dir, unsigned int dirlen)
 328 {
 329         unsigned int len;
 330         if (*dir != '/') {
 331                 memcpy(dirbuf, curr_dir, curr_dir_len);
 332                 dirbuf[curr_dir_len] = '/';
 333                 len = curr_dir_len + 1;
 334                 if (len + dirlen >= MAXPATHLEN)
 335                         dirlen = 0;
 336         } else
 337                 len = 0;
 338         memcpy(dirbuf + len, dir, dirlen);
 339         dirbuf[dirlen + len] = '\0';
 340         dirbuf_len = clean_fname(dirbuf, CFN_COLLAPSE_DOT_DOT_DIRS);
 341         if (dirbuf_len > 1 && dirbuf[dirbuf_len-1] == '.'
 342             && dirbuf[dirbuf_len-2] == '/')
 343                 dirbuf_len -= 2;
 344         if (dirbuf_len != 1)
 345                 dirbuf[dirbuf_len++] = '/';
 346         dirbuf[dirbuf_len] = '\0';
 347         if (sanitize_paths)
 348                 dirbuf_depth = count_dir_elements(dirbuf + module_dirlen);
 349 }
 350
 351 /* This routine takes a per-dir merge-file entry and finishes its setup.
 352  * If the name has a path portion then we check to see if it refers to a
 353  * parent directory of the first transfer dir.  If it does, we scan all the
 354  * dirs from that point through the parent dir of the transfer dir looking
 355  * for the per-dir merge-file in each one. */
 356 static BOOL setup_merge_file(struct filter_struct *ex,
 357                              struct filter_list_struct *lp)
 358 {
 359         char buf[MAXPATHLEN];
 360         char *x, *y, *pat = ex->pattern;
 361         unsigned int len;
 362
 363         if (!(x = parse_merge_name(pat, NULL, 0)) || *x != '/')
 364                 return 0;
 365
 366         y = strrchr(x, '/');
 367         *y = '\0';
 368         ex->pattern = strdup(y+1);
 369         if (!*x)
 370                 x = "/";
 371         if (*x == '/')
 372                 strlcpy(buf, x, MAXPATHLEN);
 373         else
 374                 pathjoin(buf, MAXPATHLEN, dirbuf, x);
 375
 376         len = clean_fname(buf, CFN_COLLAPSE_DOT_DOT_DIRS);
 377         if (len != 1 && len < MAXPATHLEN-1) {
 378                 buf[len++] = '/';
 379                 buf[len] = '\0';
 380         }
 381         /* This ensures that the specified dir is a parent of the transfer. */
 382         for (x = buf, y = dirbuf; *x && *x == *y; x++, y++) {}
 383         if (*x)
 384                 y += strlen(y); /* nope -- skip the scan */
 385
 386         parent_dirscan = True;
 387         while (*y) {
 388                 char save[MAXPATHLEN];
 389                 strlcpy(save, y, MAXPATHLEN);
 390                 *y = '\0';
 391                 dirbuf_len = y - dirbuf;
 392                 strlcpy(x, ex->pattern, MAXPATHLEN - (x - buf));
 393                 parse_filter_file(lp, buf, ex->match_flags, XFLG_ANCHORED2ABS);
 394                 if (ex->match_flags & MATCHFLG_NO_INHERIT)
 395                         lp->head = NULL;
 396                 lp->tail = NULL;
 397                 strlcpy(y, save, MAXPATHLEN);
 398                 while ((*x++ = *y++) != '/') {}
 399         }
 400         parent_dirscan = False;
 401         free(pat);
 402         return 1;
 403 }
 404
 405 /* Each time rsync changes to a new directory it call this function to
 406  * handle all the per-dir merge-files.  The "dir" value is the current path
 407  * relative to curr_dir (which might not be null-terminated).  We copy it
 408  * into dirbuf so that we can easily append a file name on the end. */
 409 void *push_local_filters(const char *dir, unsigned int dirlen)
 410 {
 411         struct filter_list_struct *ap, *push;
 412         int i;
 413
 414         set_filter_dir(dir, dirlen);
 415
 416         if (!mergelist_cnt)
 417                 return NULL;
 418
 419         push = new_array(struct filter_list_struct, mergelist_cnt);
 420         if (!push)
 421                 out_of_memory("push_local_filters");
 422
 423         for (i = 0, ap = push; i < mergelist_cnt; i++) {
 424                 memcpy(ap++, mergelist_parents[i]->u.mergelist,
 425                        sizeof (struct filter_list_struct));
 426         }
 427
 428         /* Note: parse_filter_file() might increase mergelist_cnt, so keep
 429          * this loop separate from the above loop. */
 430         for (i = 0; i < mergelist_cnt; i++) {
 431                 struct filter_struct *ex = mergelist_parents[i];
 432                 struct filter_list_struct *lp = ex->u.mergelist;
 433
 434                 if (verbose > 2) {
 435                         rprintf(FINFO, "[%s] pushing filter list%s\n",
 436                                 who_am_i(), lp->debug_type);
 437                 }
 438
 439                 lp->tail = NULL; /* Switch any local rules to inherited. */
 440                 if (ex->match_flags & MATCHFLG_NO_INHERIT)
 441                         lp->head = NULL;
 442
 443                 if (ex->match_flags & MATCHFLG_FINISH_SETUP) {
 444                         ex->match_flags &= ~MATCHFLG_FINISH_SETUP;
 445                         if (setup_merge_file(ex, lp))
 446                                 set_filter_dir(dir, dirlen);
 447                 }
 448
 449                 if (strlcpy(dirbuf + dirbuf_len, ex->pattern,
 450                     MAXPATHLEN - dirbuf_len) < MAXPATHLEN - dirbuf_len) {
 451                         parse_filter_file(lp, dirbuf, ex->match_flags,
 452                                           XFLG_ANCHORED2ABS);
 453                 } else {
 454                         io_error |= IOERR_GENERAL;
 455                         rprintf(FINFO,
 456                             "cannot add local filter rules in long-named directory: %s\n",
 457                             full_fname(dirbuf));
 458                 }
 459                 dirbuf[dirbuf_len] = '\0';
 460         }
 461
 462         return (void*)push;
 463 }
 464
 465 void pop_local_filters(void *mem)
 466 {
 467         struct filter_list_struct *ap, *pop = (struct filter_list_struct*)mem;
 468         int i;
 469
 470         for (i = mergelist_cnt; i-- > 0; ) {
 471                 struct filter_struct *ex = mergelist_parents[i];
 472                 struct filter_list_struct *lp = ex->u.mergelist;
 473
 474                 if (verbose > 2) {
 475                         rprintf(FINFO, "[%s] popping filter list%s\n",
 476                                 who_am_i(), lp->debug_type);
 477                 }
 478
 479                 clear_filter_list(lp);
 480         }
 481
 482         if (!pop)
 483                 return;
 484
 485         for (i = 0, ap = pop; i < mergelist_cnt; i++) {
 486                 memcpy(mergelist_parents[i]->u.mergelist, ap++,
 487                        sizeof (struct filter_list_struct));
 488         }
 489
 490         free(pop);
 491 }
 492
 493 void change_local_filter_dir(const char *dname, int dlen, int dir_depth)
 494 {
 495         static int cur_depth = -1;
 496         static void *filt_array[MAXPATHLEN/2+1];
 497
 498         if (!dname) {
 499                 for ( ; cur_depth >= 0; cur_depth--) {
 500                         if (filt_array[cur_depth]) {
 501                                 pop_local_filters(filt_array[cur_depth]);
 502                                 filt_array[cur_depth] = NULL;
 503                         }
 504                 }
 505                 return;
 506         }
 507
 508         assert(dir_depth < MAXPATHLEN/2+1);
 509
 510         for ( ; cur_depth >= dir_depth; cur_depth--) {
 511                 if (filt_array[cur_depth]) {
 512                         pop_local_filters(filt_array[cur_depth]);
 513                         filt_array[cur_depth] = NULL;
 514                 }
 515         }
 516
 517         cur_depth = dir_depth;
 518         filt_array[cur_depth] = push_local_filters(dname, dlen);
 519 }
 520
 521 static int rule_matches(char *fname, struct filter_struct *ex, int name_is_dir)
 522 {
 523         int slash_handling, str_cnt = 0, anchored_match = 0;
 524         int ret_match = ex->match_flags & MATCHFLG_NEGATE ? 0 : 1;
 525         char *p, *pattern = ex->pattern;
 526         const char *strings[16]; /* more than enough */
 527         char *name = fname + (*fname == '/');
 528
 529         if (!*name)
 530                 return 0;
 531
 532         if (!ex->u.slash_cnt && !(ex->match_flags & MATCHFLG_WILD2)) {
 533                 /* If the pattern does not have any slashes AND it does
 534                  * not have a "**" (which could match a slash), then we
 535                  * just match the name portion of the path. */
 536                 if ((p = strrchr(name,'/')) != NULL)
 537                         name = p+1;
 538         } else if (ex->match_flags & MATCHFLG_ABS_PATH && *fname != '/'
 539             && curr_dir_len > module_dirlen + 1) {
 540                 /* If we're matching against an absolute-path pattern,
 541                  * we need to prepend our full path info. */
 542                 strings[str_cnt++] = curr_dir + module_dirlen + 1;
 543                 strings[str_cnt++] = "/";
 544         } else if (ex->match_flags & MATCHFLG_WILD2_PREFIX && *fname != '/') {
 545                 /* Allow "**"+"/" to match at the start of the string. */
 546                 strings[str_cnt++] = "/";
 547         }
 548         strings[str_cnt++] = name;
 549         if (name_is_dir) {
 550                 /* Allow a trailing "/"+"***" to match the directory. */
 551                 if (ex->match_flags & MATCHFLG_WILD3_SUFFIX)
 552                         strings[str_cnt++] = "/";
 553         } else if (ex->match_flags & MATCHFLG_DIRECTORY)
 554                 return !ret_match;
 555         strings[str_cnt] = NULL;
 556
 557         if (*pattern == '/') {
 558                 anchored_match = 1;
 559                 pattern++;
 560         }
 561
 562         if (!anchored_match && ex->u.slash_cnt
 563             && !(ex->match_flags & MATCHFLG_WILD2)) {
 564                 /* A non-anchored match with an infix slash and no "**"
 565                  * needs to match the last slash_cnt+1 name elements. */
 566                 slash_handling = ex->u.slash_cnt + 1;
 567         } else if (!anchored_match && !(ex->match_flags & MATCHFLG_WILD2_PREFIX)
 568                                    && ex->match_flags & MATCHFLG_WILD2) {
 569                 /* A non-anchored match with an infix or trailing "**" (but not
 570                  * a prefixed "**") needs to try matching after every slash. */
 571                 slash_handling = -1;
 572         } else {
 573                 /* The pattern matches only at the start of the path or name. */
 574                 slash_handling = 0;
 575         }
 576
 577         if (ex->match_flags & MATCHFLG_WILD) {
 578                 if (wildmatch_array(pattern, strings, slash_handling))
 579                         return ret_match;
 580         } else if (str_cnt > 1) {
 581                 if (litmatch_array(pattern, strings, slash_handling))
 582                         return ret_match;
 583         } else if (anchored_match) {
 584                 if (strcmp(name, pattern) == 0)
 585                         return ret_match;
 586         } else {
 587                 int l1 = strlen(name);
 588                 int l2 = strlen(pattern);
 589                 if (l2 <= l1 &&
 590                     strcmp(name+(l1-l2),pattern) == 0 &&
 591                     (l1==l2 || name[l1-(l2+1)] == '/')) {
 592                         return ret_match;
 593                 }
 594         }
 595
 596         return !ret_match;
 597 }
 598
 599
 600 static void report_filter_result(char const *name,
 601                                  struct filter_struct const *ent,
 602                                  int name_is_dir, const char *type)
 603 {
 604         /* If a trailing slash is present to match only directories,
 605          * then it is stripped out by add_rule().  So as a special
 606          * case we add it back in here. */
 607
 608         if (verbose >= 2) {
 609                 static char *actions[2][2]
 610                     = { {"show", "hid"}, {"risk", "protect"} };
 611                 const char *w = who_am_i();
 612                 rprintf(FINFO, "[%s] %sing %s %s because of pattern %s%s%s\n",
 613                     w, actions[*w!='s'][!(ent->match_flags&MATCHFLG_INCLUDE)],
 614                     name_is_dir ? "directory" : "file", name, ent->pattern,
 615                     ent->match_flags & MATCHFLG_DIRECTORY ? "/" : "", type);
 616         }
 617 }
 618
 619
 620 /*
 621  * Return -1 if file "name" is defined to be excluded by the specified
 622  * exclude list, 1 if it is included, and 0 if it was not matched.
 623  */
 624 int check_filter(struct filter_list_struct *listp, char *name, int name_is_dir)
 625 {
 626         struct filter_struct *ent;
 627
 628         for (ent = listp->head; ent; ent = ent->next) {
 629                 if (ignore_perishable && ent->match_flags & MATCHFLG_PERISHABLE)
 630                         continue;
 631                 if (ent->match_flags & MATCHFLG_PERDIR_MERGE) {
 632                         int rc = check_filter(ent->u.mergelist, name,
 633                                               name_is_dir);
 634                         if (rc)
 635                                 return rc;
 636                         continue;
 637                 }
 638                 if (ent->match_flags & MATCHFLG_CVS_IGNORE) {
 639                         int rc = check_filter(&cvs_filter_list, name,
 640                                               name_is_dir);
 641                         if (rc)
 642                                 return rc;
 643                         continue;
 644                 }
 645                 if (rule_matches(name, ent, name_is_dir)) {
 646                         report_filter_result(name, ent, name_is_dir,
 647                                               listp->debug_type);
 648                         return ent->match_flags & MATCHFLG_INCLUDE ? 1 : -1;
 649                 }
 650         }
 651
 652         return 0;
 653 }
 654
 655 #define RULE_STRCMP(s,r) rule_strcmp((s), (r), sizeof (r) - 1)
 656
 657 static const uchar *rule_strcmp(const uchar *str, const char *rule, int rule_len)
 658 {
 659         if (strncmp((char*)str, rule, rule_len) != 0)
 660                 return NULL;
 661         if (isspace(str[rule_len]) || str[rule_len] == '_' || !str[rule_len])
 662                 return str + rule_len - 1;
 663         if (str[rule_len] == ',')
 664                 return str + rule_len;
 665         return NULL;
 666 }
 667
 668 /* Get the next include/exclude arg from the string.  The token will not
 669  * be '\0' terminated, so use the returned length to limit the string.
 670  * Also, be sure to add this length to the returned pointer before passing
 671  * it back to ask for the next token.  This routine parses the "!" (list-
 672  * clearing) token and (depending on the mflags) the various prefixes.
 673  * The *mflags_ptr value will be set on exit to the new MATCHFLG_* bits
 674  * for the current token. */
 675 static const char *parse_rule_tok(const char *p, uint32 mflags, int xflags,
 676                                   unsigned int *len_ptr, uint32 *mflags_ptr)
 677 {
 678         const uchar *s = (const uchar *)p;
 679         uint32 new_mflags;
 680         unsigned int len;
 681
 682         if (mflags & MATCHFLG_WORD_SPLIT) {
 683                 /* Skip over any initial whitespace. */
 684                 while (isspace(*s))
 685                         s++;
 686                 /* Update to point to real start of rule. */
 687                 p = (const char *)s;
 688         }
 689         if (!*s)
 690                 return NULL;
 691
 692         new_mflags = mflags & MATCHFLGS_FROM_CONTAINER;
 693
 694         /* Figure out what kind of a filter rule "s" is pointing at.  Note
 695          * that if MATCHFLG_NO_PREFIXES is set, the rule is either an include
 696          * or an exclude based on the inheritance of the MATCHFLG_INCLUDE
 697          * flag (above).  XFLG_OLD_PREFIXES indicates a compatibility mode
 698          * for old include/exclude patterns where just "+ " and "- " are
 699          * allowed as optional prefixes.  */
 700         if (mflags & MATCHFLG_NO_PREFIXES) {
 701                 if (*s == '!' && mflags & MATCHFLG_CVS_IGNORE)
 702                         new_mflags |= MATCHFLG_CLEAR_LIST; /* Tentative! */
 703         } else if (xflags & XFLG_OLD_PREFIXES) {
 704                 if (*s == '-' && s[1] == ' ') {
 705                         new_mflags &= ~MATCHFLG_INCLUDE;
 706                         s += 2;
 707                 } else if (*s == '+' && s[1] == ' ') {
 708                         new_mflags |= MATCHFLG_INCLUDE;
 709                         s += 2;
 710                 } else if (*s == '!')
 711                         new_mflags |= MATCHFLG_CLEAR_LIST; /* Tentative! */
 712         } else {
 713                 char ch = 0, *mods = "";
 714                 switch (*s) {
 715                 case 'c':
 716                         if ((s = RULE_STRCMP(s, "clear")) != NULL)
 717                                 ch = '!';
 718                         break;
 719                 case 'd':
 720                         if ((s = RULE_STRCMP(s, "dir-merge")) != NULL)
 721                                 ch = ':';
 722                         break;
 723                 case 'e':
 724                         if ((s = RULE_STRCMP(s, "exclude")) != NULL)
 725                                 ch = '-';
 726                         break;
 727                 case 'h':
 728                         if ((s = RULE_STRCMP(s, "hide")) != NULL)
 729                                 ch = 'H';
 730                         break;
 731                 case 'i':
 732                         if ((s = RULE_STRCMP(s, "include")) != NULL)
 733                                 ch = '+';
 734                         break;
 735                 case 'm':
 736                         if ((s = RULE_STRCMP(s, "merge")) != NULL)
 737                                 ch = '.';
 738                         break;
 739                 case 'p':
 740                         if ((s = RULE_STRCMP(s, "protect")) != NULL)
 741                                 ch = 'P';
 742                         break;
 743                 case 'r':
 744                         if ((s = RULE_STRCMP(s, "risk")) != NULL)
 745                                 ch = 'R';
 746                         break;
 747                 case 's':
 748                         if ((s = RULE_STRCMP(s, "show")) != NULL)
 749                                 ch = 'S';
 750                         break;
 751                 default:
 752                         ch = *s;
 753                         if (s[1] == ',')
 754                                 s++;
 755                         break;
 756                 }
 757                 switch (ch) {
 758                 case ':':
 759                         new_mflags |= MATCHFLG_PERDIR_MERGE
 760                                     | MATCHFLG_FINISH_SETUP;
 761                         /* FALL THROUGH */
 762                 case '.':
 763                         new_mflags |= MATCHFLG_MERGE_FILE;
 764                         mods = MODIFIERS_INCL_EXCL MODIFIERS_MERGE_FILE;
 765                         break;
 766                 case '+':
 767                         new_mflags |= MATCHFLG_INCLUDE;
 768                         /* FALL THROUGH */
 769                 case '-':
 770                         mods = MODIFIERS_INCL_EXCL;
 771                         break;
 772                 case 'S':
 773                         new_mflags |= MATCHFLG_INCLUDE;
 774                         /* FALL THROUGH */
 775                 case 'H':
 776                         new_mflags |= MATCHFLG_SENDER_SIDE;
 777                         mods = MODIFIERS_HIDE_PROTECT;
 778                         break;
 779                 case 'R':
 780                         new_mflags |= MATCHFLG_INCLUDE;
 781                         /* FALL THROUGH */
 782                 case 'P':
 783                         new_mflags |= MATCHFLG_RECEIVER_SIDE;
 784                         mods = MODIFIERS_HIDE_PROTECT;
 785                         break;
 786                 case '!':
 787                         new_mflags |= MATCHFLG_CLEAR_LIST;
 788                         mods = NULL;
 789                         break;
 790                 default:
 791                         rprintf(FERROR, "Unknown filter rule: `%s'\n", p);
 792                         exit_cleanup(RERR_SYNTAX);
 793                 }
 794                 while (mods && *++s && *s != ' ' && *s != '_') {
 795                         if (strchr(mods, *s) == NULL) {
 796                                 if (mflags & MATCHFLG_WORD_SPLIT && isspace(*s)) {
 797                                         s--;
 798                                         break;
 799                                 }
 800                             invalid:
 801                                 rprintf(FERROR,
 802                                         "invalid modifier sequence at '%c' in filter rule: %s\n",
 803                                         *s, p);
 804                                 exit_cleanup(RERR_SYNTAX);
 805                         }
 806                         switch (*s) {
 807                         case '-':
 808                                 if (new_mflags & MATCHFLG_NO_PREFIXES)
 809                                     goto invalid;
 810                                 new_mflags |= MATCHFLG_NO_PREFIXES;
 811                                 break;
 812                         case '+':
 813                                 if (new_mflags & MATCHFLG_NO_PREFIXES)
 814                                     goto invalid;
 815                                 new_mflags |= MATCHFLG_NO_PREFIXES
 816                                             | MATCHFLG_INCLUDE;
 817                                 break;
 818                         case '/':
 819                                 new_mflags |= MATCHFLG_ABS_PATH;
 820                                 break;
 821                         case '!':
 822                                 new_mflags |= MATCHFLG_NEGATE;
 823                                 break;
 824                         case 'C':
 825                                 if (new_mflags & MATCHFLG_NO_PREFIXES)
 826                                     goto invalid;
 827                                 new_mflags |= MATCHFLG_NO_PREFIXES
 828                                             | MATCHFLG_WORD_SPLIT
 829                                             | MATCHFLG_NO_INHERIT
 830                                             | MATCHFLG_CVS_IGNORE;
 831                                 break;
 832                         case 'e':
 833                                 new_mflags |= MATCHFLG_EXCLUDE_SELF;
 834                                 break;
 835                         case 'n':
 836                                 new_mflags |= MATCHFLG_NO_INHERIT;
 837                                 break;
 838                         case 'p':
 839                                 new_mflags |= MATCHFLG_PERISHABLE;
 840                                 break;
 841                         case 'r':
 842                                 new_mflags |= MATCHFLG_RECEIVER_SIDE;
 843                                 break;
 844                         case 's':
 845                                 new_mflags |= MATCHFLG_SENDER_SIDE;
 846                                 break;
 847                         case 'w':
 848                                 new_mflags |= MATCHFLG_WORD_SPLIT;
 849                                 break;
 850                         }
 851                 }
 852                 if (*s)
 853                         s++;
 854         }
 855
 856         if (mflags & MATCHFLG_WORD_SPLIT) {
 857                 const uchar *cp = s;
 858                 /* Token ends at whitespace or the end of the string. */
 859                 while (!isspace(*cp) && *cp != '\0')
 860                         cp++;
 861                 len = cp - s;
 862         } else
 863                 len = strlen((char*)s);
 864
 865         if (new_mflags & MATCHFLG_CLEAR_LIST) {
 866                 if (!(mflags & MATCHFLG_NO_PREFIXES)
 867                  && !(xflags & XFLG_OLD_PREFIXES) && len) {
 868                         rprintf(FERROR,
 869                                 "'!' rule has trailing characters: %s\n", p);
 870                         exit_cleanup(RERR_SYNTAX);
 871                 }
 872                 if (len > 1)
 873                         new_mflags &= ~MATCHFLG_CLEAR_LIST;
 874         } else if (!len && !(new_mflags & MATCHFLG_CVS_IGNORE)) {
 875                 rprintf(FERROR, "unexpected end of filter rule: %s\n", p);
 876                 exit_cleanup(RERR_SYNTAX);
 877         }
 878
 879         /* --delete-excluded turns an un-modified include/exclude into a
 880          * sender-side rule.  We also affect per-dir merge files that take
 881          * no prefixes as a simple optimization. */
 882         if (delete_excluded
 883          && !(new_mflags & (MATCHFLG_RECEIVER_SIDE|MATCHFLG_SENDER_SIDE))
 884          && (!(new_mflags & MATCHFLG_PERDIR_MERGE)
 885           || new_mflags & MATCHFLG_NO_PREFIXES))
 886                 new_mflags |= MATCHFLG_SENDER_SIDE;
 887
 888         *len_ptr = len;
 889         *mflags_ptr = new_mflags;
 890         return (const char *)s;
 891 }
 892
 893
 894 static char default_cvsignore[] =
 895         /* These default ignored items come from the CVS manual. */
 896         "RCS SCCS CVS CVS.adm RCSLOG cvslog.* tags TAGS"
 897         " .make.state .nse_depinfo *~ #* .#* ,* _$* *$"
 898         " *.old *.bak *.BAK *.orig *.rej .del-*"
 899         " *.a *.olb *.o *.obj *.so *.exe"
 900         " *.Z *.elc *.ln core"
 901         /* The rest we added to suit ourself. */
 902         " .svn/ .git/ .bzr/";
 903
 904 static void get_cvs_excludes(uint32 mflags)
 905 {
 906         static int initialized = 0;
 907         char *p, fname[MAXPATHLEN];
 908
 909         if (initialized)
 910                 return;
 911         initialized = 1;
 912
 913         parse_rule(&cvs_filter_list, default_cvsignore,
 914                    mflags | (protocol_version >= 30 ? MATCHFLG_PERISHABLE : 0),
 915                    0);
 916
 917         p = module_id >= 0 && lp_use_chroot(module_id) ? "/" : getenv("HOME");
 918         if (p && pathjoin(fname, MAXPATHLEN, p, ".cvsignore") < MAXPATHLEN)
 919                 parse_filter_file(&cvs_filter_list, fname, mflags, 0);
 920
 921         parse_rule(&cvs_filter_list, getenv("CVSIGNORE"), mflags, 0);
 922 }
 923
 924
 925 void parse_rule(struct filter_list_struct *listp, const char *pattern,
 926                 uint32 mflags, int xflags)
 927 {
 928         unsigned int pat_len;
 929         uint32 new_mflags;
 930         const char *cp, *p;
 931
 932         if (!pattern)
 933                 return;
 934
 935         while (1) {
 936                 /* Remember that the returned string is NOT '\0' terminated! */
 937                 cp = parse_rule_tok(pattern, mflags, xflags,
 938                                     &pat_len, &new_mflags);
 939                 if (!cp)
 940                         break;
 941
 942                 pattern = cp + pat_len;
 943
 944                 if (pat_len >= MAXPATHLEN) {
 945                         rprintf(FERROR, "discarding over-long filter: %.*s\n",
 946                                 (int)pat_len, cp);
 947                         continue;
 948                 }
 949
 950                 if (new_mflags & MATCHFLG_CLEAR_LIST) {
 951                         if (verbose > 2) {
 952                                 rprintf(FINFO,
 953                                         "[%s] clearing filter list%s\n",
 954                                         who_am_i(), listp->debug_type);
 955                         }
 956                         clear_filter_list(listp);
 957                         continue;
 958                 }
 959
 960                 if (new_mflags & MATCHFLG_MERGE_FILE) {
 961                         unsigned int len;
 962                         if (!pat_len) {
 963                                 cp = ".cvsignore";
 964                                 pat_len = 10;
 965                         }
 966                         len = pat_len;
 967                         if (new_mflags & MATCHFLG_EXCLUDE_SELF) {
 968                                 const char *name = cp + len;
 969                                 while (name > cp && name[-1] != '/') name--;
 970                                 len -= name - cp;
 971                                 add_rule(listp, name, len, 0, 0);
 972                                 new_mflags &= ~MATCHFLG_EXCLUDE_SELF;
 973                                 len = pat_len;
 974                         }
 975                         if (new_mflags & MATCHFLG_PERDIR_MERGE) {
 976                                 if (parent_dirscan) {
 977                                         if (!(p = parse_merge_name(cp, &len,
 978                                                                 module_dirlen)))
 979                                                 continue;
 980                                         add_rule(listp, p, len, new_mflags, 0);
 981                                         continue;
 982                                 }
 983                         } else {
 984                                 if (!(p = parse_merge_name(cp, &len, 0)))
 985                                         continue;
 986                                 parse_filter_file(listp, p, new_mflags,
 987                                                   XFLG_FATAL_ERRORS);
 988                                 continue;
 989                         }
 990                 }
 991
 992                 add_rule(listp, cp, pat_len, new_mflags, xflags);
 993
 994                 if (new_mflags & MATCHFLG_CVS_IGNORE
 995                     && !(new_mflags & MATCHFLG_MERGE_FILE))
 996                         get_cvs_excludes(new_mflags);
 997         }
 998 }
 999
1000
1001 void parse_filter_file(struct filter_list_struct *listp, const char *fname,
1002                        uint32 mflags, int xflags)
1003 {
1004         FILE *fp;
1005         char line[BIGPATHBUFLEN];
1006         char *eob = line + sizeof line - 1;
1007         int word_split = mflags & MATCHFLG_WORD_SPLIT;
1008
1009         if (!fname || !*fname)
1010                 return;
1011
1012         if (*fname != '-' || fname[1] || am_server) {
1013                 if (server_filter_list.head) {
1014                         strlcpy(line, fname, sizeof line);
1015                         clean_fname(line, CFN_COLLAPSE_DOT_DOT_DIRS);
1016                         if (check_filter(&server_filter_list, line, 0) < 0)
1017                                 fp = NULL;
1018                         else
1019                                 fp = fopen(line, "rb");
1020                 } else
1021                         fp = fopen(fname, "rb");
1022         } else
1023                 fp = stdin;
1024
1025         if (verbose > 2) {
1026                 rprintf(FINFO, "[%s] parse_filter_file(%s,%x,%x)%s\n",
1027                         who_am_i(), fname, mflags, xflags,
1028                         fp ? "" : " [not found]");
1029         }
1030
1031         if (!fp) {
1032                 if (xflags & XFLG_FATAL_ERRORS) {
1033                         rsyserr(FERROR, errno,
1034                                 "failed to open %sclude file %s",
1035                                 mflags & MATCHFLG_INCLUDE ? "in" : "ex",
1036                                 fname);
1037                         exit_cleanup(RERR_FILEIO);
1038                 }
1039                 return;
1040         }
1041         dirbuf[dirbuf_len] = '\0';
1042
1043         while (1) {
1044                 char *s = line;
1045                 int ch, overflow = 0;
1046                 while (1) {
1047                         if ((ch = getc(fp)) == EOF) {
1048                                 if (ferror(fp) && errno == EINTR) {
1049                                         clearerr(fp);
1050                                         continue;
1051                                 }
1052                                 break;
1053                         }
1054                         if (word_split && isspace(ch))
1055                                 break;
1056                         if (eol_nulls? !ch : (ch == '\n' || ch == '\r'))
1057                                 break;
1058                         if (s < eob)
1059                                 *s++ = ch;
1060                         else
1061                                 overflow = 1;
1062                 }
1063                 if (overflow) {
1064                         rprintf(FERROR, "discarding over-long filter: %s...\n", line);
1065                         s = line;
1066                 }
1067                 *s = '\0';
1068                 /* Skip an empty token and (when line parsing) comments. */
1069                 if (*line && (word_split || (*line != ';' && *line != '#')))
1070                         parse_rule(listp, line, mflags, xflags);
1071                 if (ch == EOF)
1072                         break;
1073         }
1074         fclose(fp);
1075 }
1076
1077 /* If the "for_xfer" flag is set, the prefix is made compatible with the
1078  * current protocol_version (if possible) or a NULL is returned (if not
1079  * possible). */
1080 char *get_rule_prefix(int match_flags, const char *pat, int for_xfer,
1081                       unsigned int *plen_ptr)
1082 {
1083         static char buf[MAX_RULE_PREFIX+1];
1084         char *op = buf;
1085         int legal_len = for_xfer && protocol_version < 29 ? 1 : MAX_RULE_PREFIX-1;
1086
1087         if (match_flags & MATCHFLG_PERDIR_MERGE) {
1088                 if (legal_len == 1)
1089                         return NULL;
1090                 *op++ = ':';
1091         } else if (match_flags & MATCHFLG_INCLUDE)
1092                 *op++ = '+';
1093         else if (legal_len != 1
1094             || ((*pat == '-' || *pat == '+') && pat[1] == ' '))
1095                 *op++ = '-';
1096         else
1097                 legal_len = 0;
1098
1099         if (match_flags & MATCHFLG_NEGATE)
1100                 *op++ = '!';
1101         if (match_flags & MATCHFLG_CVS_IGNORE)
1102                 *op++ = 'C';
1103         else {
1104                 if (match_flags & MATCHFLG_NO_INHERIT)
1105                         *op++ = 'n';
1106                 if (match_flags & MATCHFLG_WORD_SPLIT)
1107                         *op++ = 'w';
1108                 if (match_flags & MATCHFLG_NO_PREFIXES) {
1109                         if (match_flags & MATCHFLG_INCLUDE)
1110                                 *op++ = '+';
1111                         else
1112                                 *op++ = '-';
1113                 }
1114         }
1115         if (match_flags & MATCHFLG_EXCLUDE_SELF)
1116                 *op++ = 'e';
1117         if (match_flags & MATCHFLG_SENDER_SIDE
1118             && (!for_xfer || protocol_version >= 29))
1119                 *op++ = 's';
1120         if (match_flags & MATCHFLG_RECEIVER_SIDE
1121             && (!for_xfer || protocol_version >= 29
1122              || (delete_excluded && am_sender)))
1123                 *op++ = 'r';
1124         if (match_flags & MATCHFLG_PERISHABLE) {
1125                 if (!for_xfer || protocol_version >= 30)
1126                         *op++ = 'p';
1127                 else if (am_sender)
1128                         return NULL;
1129         }
1130         if (op - buf > legal_len)
1131                 return NULL;
1132         if (legal_len)
1133                 *op++ = ' ';
1134         *op = '\0';
1135         if (plen_ptr)
1136                 *plen_ptr = op - buf;
1137         return buf;
1138 }
1139
1140 static void send_rules(int f_out, struct filter_list_struct *flp)
1141 {
1142         struct filter_struct *ent, *prev = NULL;
1143
1144         for (ent = flp->head; ent; ent = ent->next) {
1145                 unsigned int len, plen, dlen;
1146                 int elide = 0;
1147                 char *p;
1148
1149                 /* Note we need to check delete_excluded here in addition to
1150                  * the code in parse_rule_tok() because some rules may have
1151                  * been added before we found the --delete-excluded option.
1152                  * We must also elide any CVS merge-file rules to avoid a
1153                  * backward compatibility problem, and we elide any no-prefix
1154                  * merge files as an optimization (since they can only have
1155                  * include/exclude rules). */
1156                 if (ent->match_flags & MATCHFLG_SENDER_SIDE)
1157                         elide = am_sender ? 1 : -1;
1158                 if (ent->match_flags & MATCHFLG_RECEIVER_SIDE)
1159                         elide = elide ? 0 : am_sender ? -1 : 1;
1160                 else if (delete_excluded && !elide
1161                  && (!(ent->match_flags & MATCHFLG_PERDIR_MERGE)
1162                   || ent->match_flags & MATCHFLG_NO_PREFIXES))
1163                         elide = am_sender ? 1 : -1;
1164                 if (elide < 0) {
1165                         if (prev)
1166                                 prev->next = ent->next;
1167                         else
1168                                 flp->head = ent->next;
1169                 } else
1170                         prev = ent;
1171                 if (elide > 0)
1172                         continue;
1173                 if (ent->match_flags & MATCHFLG_CVS_IGNORE
1174                     && !(ent->match_flags & MATCHFLG_MERGE_FILE)) {
1175                         int f = am_sender || protocol_version < 29 ? f_out : -2;
1176                         send_rules(f, &cvs_filter_list);
1177                         if (f == f_out)
1178                                 continue;
1179                 }
1180                 p = get_rule_prefix(ent->match_flags, ent->pattern, 1, &plen);
1181                 if (!p) {
1182                         rprintf(FERROR,
1183                                 "filter rules are too modern for remote rsync.\n");
1184                         exit_cleanup(RERR_PROTOCOL);
1185                 }
1186                 if (f_out < 0)
1187                         continue;
1188                 len = strlen(ent->pattern);
1189                 dlen = ent->match_flags & MATCHFLG_DIRECTORY ? 1 : 0;
1190                 if (!(plen + len + dlen))
1191                         continue;
1192                 write_int(f_out, plen + len + dlen);
1193                 if (plen)
1194                         write_buf(f_out, p, plen);
1195                 write_buf(f_out, ent->pattern, len);
1196                 if (dlen)
1197                         write_byte(f_out, '/');
1198         }
1199         flp->tail = prev;
1200 }
1201
1202 /* This is only called by the client. */
1203 void send_filter_list(int f_out)
1204 {
1205         int receiver_wants_list = prune_empty_dirs
1206             || (delete_mode && (!delete_excluded || protocol_version >= 29));
1207
1208         if (local_server || (am_sender && !receiver_wants_list))
1209                 f_out = -1;
1210         if (cvs_exclude && am_sender) {
1211                 if (protocol_version >= 29)
1212                         parse_rule(&filter_list, ":C", 0, 0);
1213                 parse_rule(&filter_list, "-C", 0, 0);
1214         }
1215
1216         send_rules(f_out, &filter_list);
1217
1218         if (f_out >= 0)
1219                 write_int(f_out, 0);
1220
1221         if (cvs_exclude) {
1222                 if (!am_sender || protocol_version < 29)
1223                         parse_rule(&filter_list, ":C", 0, 0);
1224                 if (!am_sender)
1225                         parse_rule(&filter_list, "-C", 0, 0);
1226         }
1227 }
1228
1229 /* This is only called by the server. */
1230 void recv_filter_list(int f_in)
1231 {
1232         char line[BIGPATHBUFLEN];
1233         int xflags = protocol_version >= 29 ? 0 : XFLG_OLD_PREFIXES;
1234         int receiver_wants_list = prune_empty_dirs
1235             || (delete_mode
1236              && (!delete_excluded || protocol_version >= 29));
1237         unsigned int len;
1238
1239         if (!local_server && (am_sender || receiver_wants_list)) {
1240                 while ((len = read_int(f_in)) != 0) {
1241                         if (len >= sizeof line)
1242                                 overflow_exit("recv_rules");
1243                         read_sbuf(f_in, line, len);
1244                         parse_rule(&filter_list, line, 0, xflags);
1245                 }
1246         }
1247
1248         if (cvs_exclude) {
1249                 if (local_server || am_sender || protocol_version < 29)
1250                         parse_rule(&filter_list, ":C", 0, 0);
1251                 if (local_server || am_sender)
1252                         parse_rule(&filter_list, "-C", 0, 0);
1253         }
1254
1255         if (local_server) /* filter out any rules that aren't for us. */
1256                 send_rules(-1, &filter_list);
1257 }