generator.c

   1 /* -*- c-file-style: "linux" -*-
   2
   3    rsync -- fast file replication program
   4
   5    Copyright (C) 1996-2000 by Andrew Tridgell
   6    Copyright (C) Paul Mackerras 1996
   7    Copyright (C) 2002 by Martin Pool <mbp@samba.org>
   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 2 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
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 #include "rsync.h"
  25
  26 extern int verbose;
  27 extern int dry_run;
  28 extern int log_format_has_i;
  29 extern int log_format_has_o_or_i;
  30 extern int daemon_log_format_has_i;
  31 extern int am_root;
  32 extern int am_server;
  33 extern int am_daemon;
  34 extern int recurse;
  35 extern int relative_paths;
  36 extern int keep_dirlinks;
  37 extern int preserve_links;
  38 extern int preserve_devices;
  39 extern int preserve_hard_links;
  40 extern int preserve_perms;
  41 extern int preserve_uid;
  42 extern int preserve_gid;
  43 extern int preserve_times;
  44 extern int omit_dir_times;
  45 extern int delete_before;
  46 extern int delete_during;
  47 extern int delete_after;
  48 extern int module_id;
  49 extern int ignore_errors;
  50 extern int remove_sent_files;
  51 extern int update_only;
  52 extern int opt_ignore_existing;
  53 extern int inplace;
  54 extern int make_backups;
  55 extern int csum_length;
  56 extern int ignore_times;
  57 extern int size_only;
  58 extern OFF_T max_size;
  59 extern int io_timeout;
  60 extern int io_error;
  61 extern int sock_f_out;
  62 extern int ignore_timeout;
  63 extern int protocol_version;
  64 extern int fuzzy_basis;
  65 extern int always_checksum;
  66 extern char *partial_dir;
  67 extern char *basis_dir[];
  68 extern int compare_dest;
  69 extern int copy_dest;
  70 extern int link_dest;
  71 extern int whole_file;
  72 extern int local_server;
  73 extern int list_only;
  74 extern int read_batch;
  75 extern int only_existing;
  76 extern int orig_umask;
  77 extern int safe_symlinks;
  78 extern long block_size; /* "long" because popt can't set an int32. */
  79 extern int max_delete;
  80 extern int force_delete;
  81 extern int one_file_system;
  82 extern struct stats stats;
  83 extern dev_t filesystem_dev;
  84 extern char *backup_dir;
  85 extern char *backup_suffix;
  86 extern int backup_suffix_len;
  87 extern struct file_list *the_file_list;
  88 extern struct filter_list_struct server_filter_list;
  89
  90 int allowed_lull = 0;
  91
  92 static int deletion_count = 0; /* used to implement --max-delete */
  93
  94
  95 static int is_backup_file(char *fn)
  96 {
  97         int k = strlen(fn) - backup_suffix_len;
  98         return k > 0 && strcmp(fn+k, backup_suffix) == 0;
  99 }
 100
 101
 102 /* Delete a file or directory.  If DEL_FORCE_RECURSE is set in the flags, or if
 103  * force_delete is set, this will delete recursively as long as DEL_NO_RECURSE
 104  * is not set in the flags. */
 105 static int delete_item(char *fname, int mode, int flags)
 106 {
 107         struct file_list *dirlist;
 108         char buf[MAXPATHLEN];
 109         int j, dlen, zap_dir, ok;
 110         void *save_filters;
 111
 112         if (!S_ISDIR(mode)) {
 113                 if (max_delete && ++deletion_count > max_delete)
 114                         return 0;
 115                 if (make_backups && (backup_dir || !is_backup_file(fname)))
 116                         ok = make_backup(fname);
 117                 else
 118                         ok = robust_unlink(fname) == 0;
 119                 if (ok) {
 120                         if (!(flags & DEL_TERSE))
 121                                 log_delete(fname, mode);
 122                         return 0;
 123                 }
 124                 if (errno == ENOENT) {
 125                         deletion_count--;
 126                         return 0;
 127                 }
 128                 rsyserr(FERROR, errno, "delete_file: unlink %s failed",
 129                         full_fname(fname));
 130                 return -1;
 131         }
 132
 133         zap_dir = (flags & DEL_FORCE_RECURSE || (force_delete && recurse))
 134                 && !(flags & DEL_NO_RECURSE);
 135         if ((max_delete && ++deletion_count > max_delete)
 136             || (dry_run && zap_dir)) {
 137                 ok = 0;
 138                 errno = ENOTEMPTY;
 139         } else if (make_backups && !backup_dir && !is_backup_file(fname)
 140             && !(flags & DEL_FORCE_RECURSE))
 141                 ok = make_backup(fname);
 142         else
 143                 ok = do_rmdir(fname) == 0;
 144         if (ok) {
 145                 if (!(flags & DEL_TERSE))
 146                         log_delete(fname, mode);
 147                 return 0;
 148         }
 149         if (errno == ENOENT) {
 150                 deletion_count--;
 151                 return 0;
 152         }
 153         if (!zap_dir || (errno != ENOTEMPTY && errno != EEXIST)) {
 154                 rsyserr(FERROR, errno, "delete_file: rmdir %s failed",
 155                         full_fname(fname));
 156                 return -1;
 157         }
 158         flags |= DEL_FORCE_RECURSE; /* mark subdir dels as not "in the way" */
 159         deletion_count--;
 160
 161         dlen = strlcpy(buf, fname, MAXPATHLEN);
 162         save_filters = push_local_filters(buf, dlen);
 163
 164         dirlist = get_dirlist(buf, dlen, 0);
 165         for (j = dirlist->count; j--; ) {
 166                 struct file_struct *fp = dirlist->files[j];
 167
 168                 if (fp->flags & FLAG_MOUNT_POINT)
 169                         continue;
 170
 171                 f_name_to(fp, buf);
 172                 if (delete_item(buf, fp->mode, flags & ~DEL_TERSE) != 0) {
 173                         flist_free(dirlist);
 174                         return -1;
 175                 }
 176         }
 177         flist_free(dirlist);
 178
 179         pop_local_filters(save_filters);
 180
 181         if (max_delete && ++deletion_count > max_delete)
 182                 return 0;
 183
 184         if (do_rmdir(fname) == 0) {
 185                 if (!(flags & DEL_TERSE))
 186                         log_delete(fname, mode);
 187         } else if (errno != ENOTEMPTY && errno != ENOENT) {
 188                 rsyserr(FERROR, errno, "delete_file: rmdir %s failed",
 189                         full_fname(fname));
 190                 return -1;
 191         }
 192
 193         return 0;
 194 }
 195
 196
 197 /* This function is used to implement per-directory deletion, and is used by
 198  * all the --delete-WHEN options.  Note that the fbuf pointer must point to a
 199  * MAXPATHLEN buffer with the name of the directory in it (the functions we
 200  * call will append names onto the end, but the old dir value will be restored
 201  * on exit). */
 202 static void delete_in_dir(struct file_list *flist, char *fbuf,
 203                           struct file_struct *file)
 204 {
 205         static int min_depth = MAXPATHLEN, cur_depth = -1;
 206         static void *filt_array[MAXPATHLEN/2+1];
 207         static int already_warned = 0;
 208         struct file_list *dirlist;
 209         char delbuf[MAXPATHLEN];
 210         STRUCT_STAT st;
 211         int dlen, i;
 212
 213         if (!flist) {
 214                 while (cur_depth >= min_depth)
 215                         pop_local_filters(filt_array[cur_depth--]);
 216                 min_depth = MAXPATHLEN;
 217                 cur_depth = -1;
 218                 return;
 219         }
 220
 221         if (verbose > 2)
 222                 rprintf(FINFO, "delete_in_dir(%s)\n", safe_fname(fbuf));
 223
 224         if (allowed_lull)
 225                 maybe_send_keepalive();
 226
 227         if (file->dir.depth >= MAXPATHLEN/2+1)
 228                 return; /* Impossible... */
 229
 230         if (io_error && !(lp_ignore_errors(module_id) || ignore_errors)) {
 231                 if (already_warned)
 232                         return;
 233                 rprintf(FINFO,
 234                         "IO error encountered -- skipping file deletion\n");
 235                 already_warned = 1;
 236                 return;
 237         }
 238
 239         while (cur_depth >= file->dir.depth && cur_depth >= min_depth)
 240                 pop_local_filters(filt_array[cur_depth--]);
 241         cur_depth = file->dir.depth;
 242         if (min_depth > cur_depth)
 243                 min_depth = cur_depth;
 244         dlen = strlen(fbuf);
 245         filt_array[cur_depth] = push_local_filters(fbuf, dlen);
 246
 247         if (link_stat(fbuf, &st, keep_dirlinks) < 0)
 248                 return;
 249
 250         if (one_file_system && file->flags & FLAG_TOP_DIR)
 251                 filesystem_dev = st.st_dev;
 252
 253         dirlist = get_dirlist(fbuf, dlen, 0);
 254
 255         /* If an item in dirlist is not found in flist, delete it
 256          * from the filesystem. */
 257         for (i = dirlist->count; i--; ) {
 258                 if (!dirlist->files[i]->basename)
 259                         continue;
 260                 if (flist_find(flist, dirlist->files[i]) < 0) {
 261                         int mode = dirlist->files[i]->mode;
 262                         f_name_to(dirlist->files[i], delbuf);
 263                         if (delete_item(delbuf, mode, DEL_FORCE_RECURSE) < 0)
 264                                 break;
 265                 }
 266         }
 267
 268         flist_free(dirlist);
 269 }
 270
 271 /* This deletes any files on the receiving side that are not present on the
 272  * sending side.  This is used by --delete-before and --delete-after. */
 273 static void do_delete_pass(struct file_list *flist)
 274 {
 275         char fbuf[MAXPATHLEN];
 276         int j;
 277
 278         if (dry_run > 1) /* destination doesn't exist yet */
 279                 return;
 280
 281         for (j = 0; j < flist->count; j++) {
 282                 struct file_struct *file = flist->files[j];
 283
 284                 if (!(file->flags & FLAG_DEL_HERE))
 285                         continue;
 286
 287                 f_name_to(file, fbuf);
 288                 if (verbose > 1 && file->flags & FLAG_TOP_DIR)
 289                         rprintf(FINFO, "deleting in %s\n", safe_fname(fbuf));
 290
 291                 delete_in_dir(flist, fbuf, file);
 292         }
 293 }
 294
 295 static int unchanged_attrs(struct file_struct *file, STRUCT_STAT *st)
 296 {
 297         if (preserve_perms
 298          && (st->st_mode & CHMOD_BITS) != (file->mode & CHMOD_BITS))
 299                 return 0;
 300
 301         if (am_root && preserve_uid && st->st_uid != file->uid)
 302                 return 0;
 303
 304         if (preserve_gid && file->gid != GID_NONE && st->st_gid != file->gid)
 305                 return 0;
 306
 307         return 1;
 308 }
 309
 310
 311 void itemize(struct file_struct *file, int ndx, int statret, STRUCT_STAT *st,
 312              int32 iflags, uchar fnamecmp_type, char *xname)
 313 {
 314         if (statret == 0) {
 315                 if (S_ISREG(file->mode) && file->length != st->st_size)
 316                         iflags |= ITEM_REPORT_SIZE;
 317                 if (!(iflags & ITEM_NO_DEST_AND_NO_UPDATE)) {
 318                         int keep_time = !preserve_times ? 0
 319                             : S_ISDIR(file->mode) ? !omit_dir_times
 320                             : !S_ISLNK(file->mode);
 321
 322                         if ((iflags & (ITEM_TRANSFER|ITEM_LOCAL_CHANGE) && !keep_time)
 323                             || (keep_time && file->modtime != st->st_mtime))
 324                                 iflags |= ITEM_REPORT_TIME;
 325                         if (preserve_perms && file->mode != st->st_mode)
 326                                 iflags |= ITEM_REPORT_PERMS;
 327                         if (preserve_uid && am_root && file->uid != st->st_uid)
 328                                 iflags |= ITEM_REPORT_OWNER;
 329                         if (preserve_gid && file->gid != GID_NONE
 330                             && st->st_gid != file->gid)
 331                                 iflags |= ITEM_REPORT_GROUP;
 332                 }
 333         } else
 334                 iflags |= ITEM_IS_NEW;
 335
 336         iflags &= 0xffff;
 337         if ((iflags & SIGNIFICANT_ITEM_FLAGS || verbose > 1
 338           || (xname && *xname)) && !read_batch) {
 339                 if (protocol_version >= 29) {
 340                         if (ndx >= 0)
 341                                 write_int(sock_f_out, ndx);
 342                         write_shortint(sock_f_out, iflags);
 343                         if (iflags & ITEM_BASIS_TYPE_FOLLOWS)
 344                                 write_byte(sock_f_out, fnamecmp_type);
 345                         if (iflags & ITEM_XNAME_FOLLOWS)
 346                                 write_vstring(sock_f_out, xname, strlen(xname));
 347                 } else if (ndx >= 0)
 348                         log_item(file, &stats, iflags, xname);
 349         }
 350 }
 351
 352
 353 /* Perform our quick-check heuristic for determining if a file is unchanged. */
 354 static int unchanged_file(char *fn, struct file_struct *file, STRUCT_STAT *st)
 355 {
 356         if (st->st_size != file->length)
 357                 return 0;
 358
 359         /* if always checksum is set then we use the checksum instead
 360            of the file time to determine whether to sync */
 361         if (always_checksum && S_ISREG(st->st_mode)) {
 362                 char sum[MD4_SUM_LENGTH];
 363                 file_checksum(fn, sum, st->st_size);
 364                 return memcmp(sum, file->u.sum, protocol_version < 21 ? 2
 365                                                         : MD4_SUM_LENGTH) == 0;
 366         }
 367
 368         if (size_only)
 369                 return 1;
 370
 371         if (ignore_times)
 372                 return 0;
 373
 374         return cmp_modtime(st->st_mtime, file->modtime) == 0;
 375 }
 376
 377
 378 /*
 379  * set (initialize) the size entries in the per-file sum_struct
 380  * calculating dynamic block and checksum sizes.
 381  *
 382  * This is only called from generate_and_send_sums() but is a separate
 383  * function to encapsulate the logic.
 384  *
 385  * The block size is a rounded square root of file length.
 386  *
 387  * The checksum size is determined according to:
 388  *     blocksum_bits = BLOCKSUM_BIAS + 2*log2(file_len) - log2(block_len)
 389  * provided by Donovan Baarda which gives a probability of rsync
 390  * algorithm corrupting data and falling back using the whole md4
 391  * checksums.
 392  *
 393  * This might be made one of several selectable heuristics.
 394  */
 395 static void sum_sizes_sqroot(struct sum_struct *sum, int64 len)
 396 {
 397         int32 blength;
 398         int s2length;
 399
 400         if (block_size)
 401                 blength = block_size;
 402         else if (len <= BLOCK_SIZE * BLOCK_SIZE)
 403                 blength = BLOCK_SIZE;
 404         else {
 405                 int32 c;
 406                 int64 l;
 407                 int cnt;
 408                 for (c = 1, l = len, cnt = 0; l >>= 2; c <<= 1, cnt++) {}
 409                 if (cnt >= 31 || c >= MAX_BLOCK_SIZE)
 410                         blength = MAX_BLOCK_SIZE;
 411                 else {
 412                     blength = 0;
 413                     do {
 414                             blength |= c;
 415                             if (len < (int64)blength * blength)
 416                                     blength &= ~c;
 417                             c >>= 1;
 418                     } while (c >= 8);   /* round to multiple of 8 */
 419                     blength = MAX(blength, BLOCK_SIZE);
 420                 }
 421         }
 422
 423         if (protocol_version < 27) {
 424                 s2length = csum_length;
 425         } else if (csum_length == SUM_LENGTH) {
 426                 s2length = SUM_LENGTH;
 427         } else {
 428                 int32 c;
 429                 int64 l;
 430                 int b = BLOCKSUM_BIAS;
 431                 for (l = len; l >>= 1; b += 2) {}
 432                 for (c = blength; c >>= 1 && b; b--) {}
 433                 /* add a bit, subtract rollsum, round up. */
 434                 s2length = (b + 1 - 32 + 7) / 8; /* --optimize in compiler-- */
 435                 s2length = MAX(s2length, csum_length);
 436                 s2length = MIN(s2length, SUM_LENGTH);
 437         }
 438
 439         sum->flength    = len;
 440         sum->blength    = blength;
 441         sum->s2length   = s2length;
 442         sum->count      = (len + (blength - 1)) / blength;
 443         sum->remainder  = (len % blength);
 444
 445         if (sum->count && verbose > 2) {
 446                 rprintf(FINFO,
 447                         "count=%.0f rem=%ld blength=%ld s2length=%d flength=%.0f\n",
 448                         (double)sum->count, (long)sum->remainder, (long)sum->blength,
 449                         sum->s2length, (double)sum->flength);
 450         }
 451 }
 452
 453
 454 /*
 455  * Generate and send a stream of signatures/checksums that describe a buffer
 456  *
 457  * Generate approximately one checksum every block_len bytes.
 458  */
 459 static void generate_and_send_sums(int fd, OFF_T len, int f_out, int f_copy)
 460 {
 461         int32 i;
 462         struct map_struct *mapbuf;
 463         struct sum_struct sum;
 464         OFF_T offset = 0;
 465
 466         sum_sizes_sqroot(&sum, len);
 467
 468         if (len > 0)
 469                 mapbuf = map_file(fd, len, MAX_MAP_SIZE, sum.blength);
 470         else
 471                 mapbuf = NULL;
 472
 473         write_sum_head(f_out, &sum);
 474
 475         for (i = 0; i < sum.count; i++) {
 476                 int32 n1 = (int32)MIN(len, (OFF_T)sum.blength);
 477                 char *map = map_ptr(mapbuf, offset, n1);
 478                 uint32 sum1 = get_checksum1(map, n1);
 479                 char sum2[SUM_LENGTH];
 480
 481                 if (f_copy >= 0)
 482                         full_write(f_copy, map, n1);
 483
 484                 get_checksum2(map, n1, sum2);
 485
 486                 if (verbose > 3) {
 487                         rprintf(FINFO,
 488                                 "chunk[%.0f] offset=%.0f len=%ld sum1=%08lx\n",
 489                                 (double)i, (double)offset, (long)n1,
 490                                 (unsigned long)sum1);
 491                 }
 492                 write_int(f_out, sum1);
 493                 write_buf(f_out, sum2, sum.s2length);
 494                 len -= n1;
 495                 offset += n1;
 496         }
 497
 498         if (mapbuf)
 499                 unmap_file(mapbuf);
 500 }
 501
 502
 503 /* Try to find a filename in the same dir as "fname" with a similar name. */
 504 static int find_fuzzy(struct file_struct *file, struct file_list *dirlist)
 505 {
 506         int fname_len, fname_suf_len;
 507         const char *fname_suf, *fname = file->basename;
 508         uint32 lowest_dist = 25 << 16; /* ignore a distance greater than 25 */
 509         int j, lowest_j = -1;
 510
 511         fname_len = strlen(fname);
 512         fname_suf = find_filename_suffix(fname, fname_len, &fname_suf_len);
 513
 514         for (j = 0; j < dirlist->count; j++) {
 515                 struct file_struct *fp = dirlist->files[j];
 516                 const char *suf, *name;
 517                 int len, suf_len;
 518                 uint32 dist;
 519
 520                 if (!S_ISREG(fp->mode) || !fp->length
 521                     || fp->flags & FLAG_NO_FUZZY)
 522                         continue;
 523
 524                 name = fp->basename;
 525
 526                 if (fp->length == file->length
 527                     && fp->modtime == file->modtime) {
 528                         if (verbose > 4) {
 529                                 rprintf(FINFO,
 530                                         "fuzzy size/modtime match for %s\n",
 531                                         name);
 532                         }
 533                         return j;
 534                 }
 535
 536                 len = strlen(name);
 537                 suf = find_filename_suffix(name, len, &suf_len);
 538
 539                 dist = fuzzy_distance(name, len, fname, fname_len);
 540                 /* Add some extra weight to how well the suffixes match. */
 541                 dist += fuzzy_distance(suf, suf_len, fname_suf, fname_suf_len)
 542                       * 10;
 543                 if (verbose > 4) {
 544                         rprintf(FINFO, "fuzzy distance for %s = %d.%05d\n",
 545                                 name, (int)(dist>>16), (int)(dist&0xFFFF));
 546                 }
 547                 if (dist <= lowest_dist) {
 548                         lowest_dist = dist;
 549                         lowest_j = j;
 550                 }
 551         }
 552
 553         return lowest_j;
 554 }
 555
 556 void check_for_finished_hlinks(int itemizing, enum logcode code)
 557 {
 558         struct file_struct *file;
 559         int ndx;
 560
 561         while ((ndx = get_hlink_num()) != -1) {
 562                 if (ndx < 0 || ndx >= the_file_list->count)
 563                         continue;
 564
 565                 file = the_file_list->files[ndx];
 566                 if (!file->link_u.links)
 567                         continue;
 568
 569                 hard_link_cluster(file, ndx, itemizing, code);
 570         }
 571 }
 572
 573 static int phase = 0;
 574
 575 /* Acts on the_file_list->file's ndx'th item, whose name is fname.  If a dir,
 576  * make sure it exists, and has the right permissions/timestamp info.  For
 577  * all other non-regular files (symlinks, etc.) we create them here.  For
 578  * regular files that have changed, we try to find a basis file and then
 579  * start sending checksums.
 580  *
 581  * Note that f_out is set to -1 when doing final directory-permission and
 582  * modification-time repair. */
 583 static void recv_generator(char *fname, struct file_struct *file, int ndx,
 584                            int itemizing, int maybe_PERMS_REPORT,
 585                            enum logcode code, int f_out)
 586 {
 587         static int missing_below = -1, excluded_below = -1;
 588         static char *fuzzy_dirname = "";
 589         static struct file_list *fuzzy_dirlist = NULL;
 590         struct file_struct *fuzzy_file = NULL;
 591         int fd = -1, f_copy = -1;
 592         STRUCT_STAT st, real_st, partial_st;
 593         struct file_struct *back_file = NULL;
 594         int statret, real_ret, stat_errno;
 595         char *fnamecmp, *partialptr, *backupptr = NULL;
 596         char fnamecmpbuf[MAXPATHLEN];
 597         uchar fnamecmp_type;
 598
 599         if (list_only)
 600                 return;
 601
 602         if (!fname) {
 603                 if (fuzzy_dirlist) {
 604                         flist_free(fuzzy_dirlist);
 605                         fuzzy_dirlist = NULL;
 606                         fuzzy_dirname = "";
 607                 }
 608                 if (missing_below >= 0) {
 609                         dry_run--;
 610                         missing_below = -1;
 611                 }
 612                 return;
 613         }
 614
 615         if (verbose > 2) {
 616                 rprintf(FINFO, "recv_generator(%s,%d)\n",
 617                         safe_fname(fname), ndx);
 618         }
 619
 620         if (server_filter_list.head) {
 621                 if (excluded_below >= 0) {
 622                         if (file->dir.depth > excluded_below)
 623                                 goto skipping;
 624                         excluded_below = -1;
 625                 }
 626                 if (check_filter(&server_filter_list, fname,
 627                                  S_ISDIR(file->mode)) < 0) {
 628                         if (S_ISDIR(file->mode))
 629                                 excluded_below = file->dir.depth;
 630                     skipping:
 631                         if (verbose) {
 632                                 rprintf(FINFO,
 633                                         "skipping server-excluded file \"%s\"\n",
 634                                         safe_fname(fname));
 635                         }
 636                         return;
 637                 }
 638         }
 639
 640         if (missing_below >= 0 && file->dir.depth <= missing_below) {
 641                 dry_run--;
 642                 missing_below = -1;
 643         }
 644         if (dry_run > 1) {
 645                 statret = -1;
 646                 stat_errno = ENOENT;
 647         } else {
 648                 if (fuzzy_basis && S_ISREG(file->mode)) {
 649                         char *dn = file->dirname ? file->dirname : ".";
 650                         if (fuzzy_dirname != dn
 651                             && strcmp(fuzzy_dirname, dn) != 0) {
 652                                 if (fuzzy_dirlist)
 653                                         flist_free(fuzzy_dirlist);
 654                                 fuzzy_dirlist = get_dirlist(dn, -1, 1);
 655                         }
 656                         fuzzy_dirname = dn;
 657                 }
 658
 659                 statret = link_stat(fname, &st,
 660                                     keep_dirlinks && S_ISDIR(file->mode));
 661                 stat_errno = errno;
 662         }
 663
 664         if (only_existing && statret == -1 && stat_errno == ENOENT) {
 665                 /* we only want to update existing files */
 666                 if (verbose > 1) {
 667                         rprintf(FINFO, "not creating new file \"%s\"\n",
 668                                 safe_fname(fname));
 669                 }
 670                 return;
 671         }
 672
 673         if (statret == 0 && !preserve_perms
 674             && S_ISDIR(st.st_mode) == S_ISDIR(file->mode)) {
 675                 /* if the file exists already and we aren't perserving
 676                  * permissions then act as though the remote end sent
 677                  * us the file permissions we already have */
 678                 file->mode = (file->mode & ~CHMOD_BITS)
 679                            | (st.st_mode & CHMOD_BITS);
 680         }
 681
 682         if (S_ISDIR(file->mode)) {
 683                 /* The file to be received is a directory, so we need
 684                  * to prepare appropriately.  If there is already a
 685                  * file of that name and it is *not* a directory, then
 686                  * we need to delete it.  If it doesn't exist, then
 687                  * (perhaps recursively) create it. */
 688                 if (statret == 0 && !S_ISDIR(st.st_mode)) {
 689                         if (delete_item(fname, st.st_mode, DEL_TERSE) < 0)
 690                                 return;
 691                         statret = -1;
 692                 }
 693                 if (dry_run && statret != 0 && missing_below < 0) {
 694                         missing_below = file->dir.depth;
 695                         dry_run++;
 696                 }
 697                 if (itemizing && f_out != -1) {
 698                         itemize(file, ndx, statret, &st,
 699                                 statret ? ITEM_LOCAL_CHANGE : 0, 0, NULL);
 700                 }
 701                 if (statret != 0 && do_mkdir(fname,file->mode) != 0 && errno != EEXIST) {
 702                         if (!relative_paths || errno != ENOENT
 703                             || create_directory_path(fname, orig_umask) < 0
 704                             || do_mkdir(fname, file->mode) < 0) {
 705                                 rsyserr(FERROR, errno,
 706                                         "recv_generator: mkdir %s failed",
 707                                         full_fname(fname));
 708                         }
 709                 }
 710                 if (set_perms(fname, file, statret ? NULL : &st, 0)
 711                     && verbose && code && f_out != -1)
 712                         rprintf(code, "%s/\n", safe_fname(fname));
 713                 if (delete_during && f_out != -1 && !phase && dry_run < 2
 714                     && (file->flags & FLAG_DEL_HERE))
 715                         delete_in_dir(the_file_list, fname, file);
 716                 return;
 717         }
 718
 719         if (max_size && file->length > max_size) {
 720                 if (verbose > 1) {
 721                         rprintf(FINFO, "%s is over max-size\n",
 722                                 safe_fname(fname));
 723                 }
 724                 return;
 725         }
 726
 727         if (preserve_links && S_ISLNK(file->mode)) {
 728 #ifdef SUPPORT_LINKS
 729                 if (safe_symlinks && unsafe_symlink(file->u.link, fname)) {
 730                         if (verbose) {
 731                                 rprintf(FINFO,
 732                                         "ignoring unsafe symlink %s -> \"%s\"\n",
 733                                         full_fname(fname),
 734                                         safe_fname(file->u.link));
 735                         }
 736                         return;
 737                 }
 738                 if (statret == 0) {
 739                         char lnk[MAXPATHLEN];
 740                         int len;
 741
 742                         if (!S_ISDIR(st.st_mode)
 743                             && (len = readlink(fname, lnk, MAXPATHLEN-1)) > 0) {
 744                                 lnk[len] = 0;
 745                                 /* A link already pointing to the
 746                                  * right place -- no further action
 747                                  * required. */
 748                                 if (strcmp(lnk, file->u.link) == 0) {
 749                                         if (itemizing) {
 750                                                 itemize(file, ndx, 0, &st, 0,
 751                                                         0, NULL);
 752                                         }
 753                                         set_perms(fname, file, &st,
 754                                                   maybe_PERMS_REPORT);
 755                                         return;
 756                                 }
 757                         }
 758                         /* Not the right symlink (or not a symlink), so
 759                          * delete it. */
 760                         if (delete_item(fname, st.st_mode, DEL_TERSE) < 0)
 761                                 return;
 762                         if (!S_ISLNK(st.st_mode))
 763                                 statret = -1;
 764                 }
 765                 if (do_symlink(file->u.link,fname) != 0) {
 766                         rsyserr(FERROR, errno, "symlink %s -> \"%s\" failed",
 767                                 full_fname(fname), safe_fname(file->u.link));
 768                 } else {
 769                         set_perms(fname,file,NULL,0);
 770                         if (itemizing) {
 771                                 itemize(file, ndx, statret, &st,
 772                                         ITEM_LOCAL_CHANGE, 0, NULL);
 773                         }
 774                         if (code && verbose) {
 775                                 rprintf(code, "%s -> %s\n", safe_fname(fname),
 776                                         safe_fname(file->u.link));
 777                         }
 778                         if (remove_sent_files && !dry_run) {
 779                                 char numbuf[4];
 780                                 SIVAL(numbuf, 0, ndx);
 781                                 send_msg(MSG_SUCCESS, numbuf, 4);
 782                         }
 783                 }
 784 #endif
 785                 return;
 786         }
 787
 788         if (am_root && preserve_devices && IS_DEVICE(file->mode)) {
 789                 if (statret != 0 ||
 790                     st.st_mode != file->mode ||
 791                     st.st_rdev != file->u.rdev) {
 792                         if (delete_item(fname, st.st_mode, DEL_TERSE) < 0)
 793                                 return;
 794                         if (!IS_DEVICE(st.st_mode))
 795                                 statret = -1;
 796                         if (verbose > 2) {
 797                                 rprintf(FINFO,"mknod(%s,0%o,0x%x)\n",
 798                                         safe_fname(fname),
 799                                         (int)file->mode, (int)file->u.rdev);
 800                         }
 801                         if (do_mknod(fname,file->mode,file->u.rdev) != 0) {
 802                                 rsyserr(FERROR, errno, "mknod %s failed",
 803                                         full_fname(fname));
 804                         } else {
 805                                 set_perms(fname,file,NULL,0);
 806                                 if (itemizing) {
 807                                         itemize(file, ndx, statret, &st,
 808                                                 ITEM_LOCAL_CHANGE, 0, NULL);
 809                                 }
 810                                 if (code && verbose) {
 811                                         rprintf(code, "%s\n",
 812                                                 safe_fname(fname));
 813                                 }
 814                         }
 815                 } else {
 816                         if (itemizing)
 817                                 itemize(file, ndx, statret, &st, 0, 0, NULL);
 818                         set_perms(fname, file, &st, maybe_PERMS_REPORT);
 819                 }
 820                 return;
 821         }
 822
 823         if (preserve_hard_links && hard_link_check(file, ndx, HL_CHECK_MASTER))
 824                 return;
 825
 826         if (!S_ISREG(file->mode)) {
 827                 rprintf(FINFO, "skipping non-regular file \"%s\"\n",
 828                         safe_fname(fname));
 829                 return;
 830         }
 831
 832         if (opt_ignore_existing && statret == 0) {
 833                 if (verbose > 1)
 834                         rprintf(FINFO, "%s exists\n", safe_fname(fname));
 835                 return;
 836         }
 837
 838         if (update_only && statret == 0
 839             && cmp_modtime(st.st_mtime, file->modtime) > 0) {
 840                 if (verbose > 1)
 841                         rprintf(FINFO, "%s is newer\n", safe_fname(fname));
 842                 return;
 843         }
 844
 845         fnamecmp = fname;
 846         fnamecmp_type = FNAMECMP_FNAME;
 847
 848         if (statret == 0 && !S_ISREG(st.st_mode)) {
 849                 if (delete_item(fname, st.st_mode, DEL_TERSE) != 0)
 850                         return;
 851                 statret = -1;
 852                 stat_errno = ENOENT;
 853         }
 854
 855         if (statret != 0 && basis_dir[0] != NULL) {
 856                 int best_match = -1;
 857                 int match_level = 0;
 858                 int i = 0;
 859                 do {
 860                         pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 861                                  basis_dir[i], fname);
 862                         if (link_stat(fnamecmpbuf, &st, 0) < 0
 863                             || !S_ISREG(st.st_mode))
 864                                 continue;
 865                         switch (match_level) {
 866                         case 0:
 867                                 best_match = i;
 868                                 match_level = 1;
 869                                 /* FALL THROUGH */
 870                         case 1:
 871                                 if (!unchanged_file(fnamecmpbuf, file, &st))
 872                                         continue;
 873                                 best_match = i;
 874                                 match_level = 2;
 875                                 if (copy_dest)
 876                                         break;
 877                                 /* FALL THROUGH */
 878                         case 2:
 879                                 if (!unchanged_attrs(file, &st))
 880                                         continue;
 881                                 best_match = i;
 882                                 match_level = 3;
 883                                 break;
 884                         }
 885                         break;
 886                 } while (basis_dir[++i] != NULL);
 887                 if (match_level) {
 888                         statret = 0;
 889                         if (i != best_match) {
 890                                 i = best_match;
 891                                 pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 892                                          basis_dir[i], fname);
 893                                 if (link_stat(fnamecmpbuf, &st, 0) < 0) {
 894                                         match_level = 0;
 895                                         statret = -1;
 896                                         stat_errno = errno;
 897                                 }
 898                         }
 899 #ifdef HAVE_LINK
 900                         if (link_dest && match_level == 3) {
 901                                 if (hard_link_one(file, ndx, fname, -1, &st,
 902                                                   fnamecmpbuf, 1,
 903                                                   itemizing && verbose > 1,
 904                                                   code) == 0)
 905                                         return;
 906                                 if (verbose) {
 907                                         rsyserr(FINFO, errno, "link %s => %s",
 908                                                 full_fname(fnamecmpbuf),
 909                                                 safe_fname(fname));
 910                                 }
 911                                 match_level = 2;
 912                         }
 913 #endif
 914                         if (match_level == 2) {
 915                                 /* Copy the file locally. */
 916                                 if (copy_file(fnamecmpbuf, fname, file->mode) < 0) {
 917                                         if (verbose) {
 918                                                 rsyserr(FINFO, errno,
 919                                                         "copy_file %s => %s",
 920                                                         full_fname(fnamecmpbuf),
 921                                                         safe_fname(fname));
 922                                         }
 923                                         match_level = 0;
 924                                         statret = -1;
 925                                 } else
 926                                         set_perms(fname, file, NULL, 0);
 927                         } else if (compare_dest || match_level == 1) {
 928                                 fnamecmp = fnamecmpbuf;
 929                                 fnamecmp_type = i;
 930                         }
 931                 }
 932         }
 933
 934         real_ret = statret;
 935         real_st = st;
 936
 937         if (partial_dir && (partialptr = partial_dir_fname(fname)) != NULL
 938             && link_stat(partialptr, &partial_st, 0) == 0
 939             && S_ISREG(partial_st.st_mode)) {
 940                 if (statret != 0)
 941                         goto prepare_to_open;
 942         } else
 943                 partialptr = NULL;
 944
 945         if (statret != 0 && fuzzy_basis && dry_run <= 1) {
 946                 int j = find_fuzzy(file, fuzzy_dirlist);
 947                 if (j >= 0) {
 948                         fuzzy_file = fuzzy_dirlist->files[j];
 949                         f_name_to(fuzzy_file, fnamecmpbuf);
 950                         if (verbose > 2) {
 951                                 rprintf(FINFO, "fuzzy basis selected for %s: %s\n",
 952                                         safe_fname(fname), safe_fname(fnamecmpbuf));
 953                         }
 954                         st.st_size = fuzzy_file->length;
 955                         statret = 0;
 956                         fnamecmp = fnamecmpbuf;
 957                         fnamecmp_type = FNAMECMP_FUZZY;
 958                 }
 959         }
 960
 961         if (statret != 0) {
 962                 if (preserve_hard_links && hard_link_check(file, ndx, HL_SKIP))
 963                         return;
 964                 if (stat_errno == ENOENT)
 965                         goto notify_others;
 966                 if (verbose > 1) {
 967                         rsyserr(FERROR, stat_errno,
 968                                 "recv_generator: failed to stat %s",
 969                                 full_fname(fname));
 970                 }
 971                 return;
 972         }
 973
 974         if (!compare_dest && fnamecmp_type <= FNAMECMP_BASIS_DIR_HIGH)
 975                 ;
 976         else if (fnamecmp_type == FNAMECMP_FUZZY)
 977                 ;
 978         else if (unchanged_file(fnamecmp, file, &st)) {
 979                 if (fnamecmp_type == FNAMECMP_FNAME) {
 980                         if (itemizing) {
 981                                 itemize(file, ndx, real_ret, &real_st,
 982                                         0, 0, NULL);
 983                         }
 984                         set_perms(fname, file, &st, maybe_PERMS_REPORT);
 985                         if (preserve_hard_links && file->link_u.links)
 986                                 hard_link_cluster(file, ndx, itemizing, code);
 987                         return;
 988                 }
 989                 /* Only --compare-dest gets here. */
 990                 itemize(file, ndx, real_ret, &real_st,
 991                         ITEM_NO_DEST_AND_NO_UPDATE, 0, NULL);
 992                 return;
 993         }
 994
 995 prepare_to_open:
 996         if (partialptr) {
 997                 st = partial_st;
 998                 fnamecmp = partialptr;
 999                 fnamecmp_type = FNAMECMP_PARTIAL_DIR;
1000                 statret = 0;
1001         }
1002
1003         if (dry_run || read_batch || whole_file)
1004                 goto notify_others;
1005
1006         if (fuzzy_basis) {
1007                 int j = flist_find(fuzzy_dirlist, file);
1008                 if (j >= 0) /* don't use changing file as future fuzzy basis */
1009                         fuzzy_dirlist->files[j]->flags |= FLAG_NO_FUZZY;
1010         }
1011
1012         /* open the file */
1013         fd = do_open(fnamecmp, O_RDONLY, 0);
1014
1015         if (fd == -1) {
1016                 rsyserr(FERROR, errno, "failed to open %s, continuing",
1017                         full_fname(fnamecmp));
1018             pretend_missing:
1019                 /* pretend the file didn't exist */
1020                 if (preserve_hard_links && hard_link_check(file, ndx, HL_SKIP))
1021                         return;
1022                 statret = real_ret = -1;
1023                 goto notify_others;
1024         }
1025
1026         if (inplace && make_backups && fnamecmp_type == FNAMECMP_FNAME) {
1027                 if (!(backupptr = get_backup_name(fname))) {
1028                         close(fd);
1029                         return;
1030                 }
1031                 if (!(back_file = make_file(fname, NULL, NO_FILTERS))) {
1032                         close(fd);
1033                         goto pretend_missing;
1034                 }
1035                 if (robust_unlink(backupptr) && errno != ENOENT) {
1036                         rsyserr(FERROR, errno, "unlink %s",
1037                                 full_fname(backupptr));
1038                         free(back_file);
1039                         close(fd);
1040                         return;
1041                 }
1042                 if ((f_copy = do_open(backupptr,
1043                     O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0600)) < 0) {
1044                         rsyserr(FERROR, errno, "open %s",
1045                                 full_fname(backupptr));
1046                         free(back_file);
1047                         close(fd);
1048                         return;
1049                 }
1050                 fnamecmp_type = FNAMECMP_BACKUP;
1051         }
1052
1053         if (verbose > 3) {
1054                 rprintf(FINFO, "gen mapped %s of size %.0f\n",
1055                         safe_fname(fnamecmp), (double)st.st_size);
1056         }
1057
1058         if (verbose > 2)
1059                 rprintf(FINFO, "generating and sending sums for %d\n", ndx);
1060
1061 notify_others:
1062         write_int(f_out, ndx);
1063         if (itemizing) {
1064                 int iflags = ITEM_TRANSFER;
1065                 if (always_checksum)
1066                         iflags |= ITEM_REPORT_CHECKSUM;
1067                 if (fnamecmp_type != FNAMECMP_FNAME)
1068                         iflags |= ITEM_BASIS_TYPE_FOLLOWS;
1069                 if (fnamecmp_type == FNAMECMP_FUZZY)
1070                         iflags |= ITEM_XNAME_FOLLOWS;
1071                 itemize(file, -1, real_ret, &real_st, iflags, fnamecmp_type,
1072                         fuzzy_file ? fuzzy_file->basename : NULL);
1073         }
1074
1075         if (dry_run) {
1076                 if (preserve_hard_links && file->link_u.links)
1077                         hard_link_cluster(file, ndx, itemizing, code);
1078                 return;
1079         }
1080         if (read_batch)
1081                 return;
1082
1083         if (statret != 0 || whole_file) {
1084                 write_sum_head(f_out, NULL);
1085                 return;
1086         }
1087
1088         generate_and_send_sums(fd, st.st_size, f_out, f_copy);
1089
1090         if (f_copy >= 0) {
1091                 close(f_copy);
1092                 set_perms(backupptr, back_file, NULL, 0);
1093                 if (verbose > 1) {
1094                         rprintf(FINFO, "backed up %s to %s\n",
1095                                 safe_fname(fname), safe_fname(backupptr));
1096                 }
1097                 free(back_file);
1098         }
1099
1100         close(fd);
1101 }
1102
1103
1104 void generate_files(int f_out, struct file_list *flist, char *local_name)
1105 {
1106         int i, lull_mod;
1107         char fbuf[MAXPATHLEN];
1108         int itemizing, maybe_PERMS_REPORT;
1109         enum logcode code;
1110         int need_retouch_dir_times = preserve_times && !omit_dir_times;
1111         int need_retouch_dir_perms = 0;
1112         int save_only_existing = only_existing;
1113         int save_opt_ignore_existing = opt_ignore_existing;
1114
1115         allowed_lull = read_batch ? 0 : (io_timeout + 1) / 2;
1116         lull_mod = allowed_lull * 5;
1117
1118         if (protocol_version >= 29) {
1119                 itemizing = 1;
1120                 maybe_PERMS_REPORT = log_format_has_i ? 0 : PERMS_REPORT;
1121                 code = daemon_log_format_has_i ? 0 : FLOG;
1122         } else if (am_daemon) {
1123                 itemizing = daemon_log_format_has_i && !dry_run;
1124                 maybe_PERMS_REPORT = PERMS_REPORT;
1125                 code = itemizing || dry_run ? FCLIENT : FINFO;
1126         } else if (!am_server) {
1127                 itemizing = log_format_has_i;
1128                 maybe_PERMS_REPORT = log_format_has_i ? 0 : PERMS_REPORT;
1129                 code = itemizing ? 0 : FINFO;
1130         } else {
1131                 itemizing = 0;
1132                 maybe_PERMS_REPORT = PERMS_REPORT;
1133                 code = FINFO;
1134         }
1135
1136         if (verbose > 2) {
1137                 rprintf(FINFO, "generator starting pid=%ld count=%d\n",
1138                         (long)getpid(), flist->count);
1139         }
1140
1141         if (delete_before && !local_name && flist->count > 0)
1142                 do_delete_pass(flist);
1143
1144         if (whole_file < 0)
1145                 whole_file = 0;
1146         if (verbose >= 2) {
1147                 rprintf(FINFO, "delta-transmission %s\n",
1148                         whole_file
1149                         ? "disabled for local transfer or --whole-file"
1150                         : "enabled");
1151         }
1152
1153         if (protocol_version < 29)
1154                 ignore_timeout = 1;
1155
1156         for (i = 0; i < flist->count; i++) {
1157                 struct file_struct *file = flist->files[i];
1158
1159                 if (!file->basename)
1160                         continue;
1161
1162                 recv_generator(local_name ? local_name : f_name_to(file, fbuf),
1163                                file, i, itemizing, maybe_PERMS_REPORT, code,
1164                                f_out);
1165
1166                 /* We need to ensure that any dirs we create have writeable
1167                  * permissions during the time we are putting files within
1168                  * them.  This is then fixed after the transfer is done. */
1169                 if (!am_root && S_ISDIR(file->mode) && !(file->mode & S_IWUSR)) {
1170                         int mode = file->mode | S_IWUSR; /* user write */
1171                         char *fname = local_name ? local_name : fbuf;
1172                         if (do_chmod(fname, mode & CHMOD_BITS) < 0) {
1173                                 rsyserr(FERROR, errno,
1174                                         "failed to modify permissions on %s",
1175                                         full_fname(fname));
1176                         }
1177                         need_retouch_dir_perms = 1;
1178                 }
1179
1180                 if (preserve_hard_links)
1181                         check_for_finished_hlinks(itemizing, code);
1182
1183                 if (allowed_lull && !(i % lull_mod))
1184                         maybe_send_keepalive();
1185         }
1186         recv_generator(NULL, NULL, 0, 0, 0, code, -1);
1187         if (delete_during)
1188                 delete_in_dir(NULL, NULL, NULL);
1189
1190         phase++;
1191         csum_length = SUM_LENGTH;
1192         only_existing = max_size = opt_ignore_existing = 0;
1193         update_only = always_checksum = size_only = 0;
1194         ignore_times = 1;
1195         make_backups = 0; /* avoid a duplicate backup for inplace processing */
1196
1197         /* We expect to just sit around now, so don't exit on a timeout.
1198          * If we really get a timeout then the other process should exit. */
1199         ignore_timeout = 1;
1200
1201         if (verbose > 2)
1202                 rprintf(FINFO,"generate_files phase=%d\n",phase);
1203
1204         write_int(f_out, -1);
1205
1206         /* files can cycle through the system more than once
1207          * to catch initial checksum errors */
1208         while ((i = get_redo_num(itemizing, code)) != -1) {
1209                 struct file_struct *file = flist->files[i];
1210                 recv_generator(local_name ? local_name : f_name_to(file, fbuf),
1211                                file, i, itemizing, maybe_PERMS_REPORT, code,
1212                                f_out);
1213         }
1214
1215         phase++;
1216         only_existing = save_only_existing;
1217         opt_ignore_existing = save_opt_ignore_existing;
1218
1219         if (verbose > 2)
1220                 rprintf(FINFO,"generate_files phase=%d\n",phase);
1221
1222         write_int(f_out, -1);
1223
1224         /* Read MSG_DONE for the redo phase (and any prior messages). */
1225         get_redo_num(itemizing, code);
1226
1227         if (protocol_version >= 29) {
1228                 phase++;
1229                 if (verbose > 2)
1230                         rprintf(FINFO, "generate_files phase=%d\n", phase);
1231                 write_int(f_out, -1);
1232                 /* Read MSG_DONE for delay-update phase & prior messages. */
1233                 get_redo_num(itemizing, code);
1234         }
1235
1236         if (delete_after && !local_name && flist->count > 0)
1237                 do_delete_pass(flist);
1238
1239         if ((need_retouch_dir_perms || need_retouch_dir_times)
1240             && !list_only && !local_name && !dry_run) {
1241                 int j = 0;
1242                 /* Now we need to fix any directory permissions that were
1243                  * modified during the transfer and/or re-set any tweaked
1244                  * modified-time values. */
1245                 for (i = 0; i < flist->count; i++) {
1246                         struct file_struct *file = flist->files[i];
1247                         if (!file->basename || !S_ISDIR(file->mode))
1248                                 continue;
1249                         if (!need_retouch_dir_times && file->mode & S_IWUSR)
1250                                 continue;
1251                         recv_generator(f_name(file), file, i, itemizing,
1252                                        maybe_PERMS_REPORT, code, -1);
1253                         if (allowed_lull && !(j++ % lull_mod))
1254                                 maybe_send_keepalive();
1255                 }
1256         }
1257         recv_generator(NULL, NULL, 0, 0, 0, code, -1);
1258
1259         if (max_delete > 0 && deletion_count > max_delete) {
1260                 rprintf(FINFO,
1261                         "Deletions stopped due to --max-delete limit (%d skipped)\n",
1262                         deletion_count - max_delete);
1263                 io_error |= IOERR_DEL_LIMIT;
1264         }
1265
1266         if (verbose > 2)
1267                 rprintf(FINFO,"generate_files finished\n");
1268 }