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 (iflags & (ITEM_LOCAL_CHANGE|ITEM_TRANSFER))/* XXX */
 341                                 iflags |= ITEM_DUMMY_BIT; /* XXX Remove soon */
 342                         if (ndx >= 0)
 343                                 write_int(sock_f_out, ndx);
 344                         write_shortint(sock_f_out, iflags);
 345                         if (iflags & ITEM_BASIS_TYPE_FOLLOWS)
 346                                 write_byte(sock_f_out, fnamecmp_type);
 347                         if (iflags & ITEM_XNAME_FOLLOWS)
 348                                 write_vstring(sock_f_out, xname, strlen(xname));
 349                 } else if (ndx >= 0)
 350                         log_item(file, &stats, iflags, xname);
 351         }
 352 }
 353
 354
 355 /* Perform our quick-check heuristic for determining if a file is unchanged. */
 356 static int unchanged_file(char *fn, struct file_struct *file, STRUCT_STAT *st)
 357 {
 358         if (st->st_size != file->length)
 359                 return 0;
 360
 361         /* if always checksum is set then we use the checksum instead
 362            of the file time to determine whether to sync */
 363         if (always_checksum && S_ISREG(st->st_mode)) {
 364                 char sum[MD4_SUM_LENGTH];
 365                 file_checksum(fn, sum, st->st_size);
 366                 return memcmp(sum, file->u.sum, protocol_version < 21 ? 2
 367                                                         : MD4_SUM_LENGTH) == 0;
 368         }
 369
 370         if (size_only)
 371                 return 1;
 372
 373         if (ignore_times)
 374                 return 0;
 375
 376         return cmp_modtime(st->st_mtime, file->modtime) == 0;
 377 }
 378
 379
 380 /*
 381  * set (initialize) the size entries in the per-file sum_struct
 382  * calculating dynamic block and checksum sizes.
 383  *
 384  * This is only called from generate_and_send_sums() but is a separate
 385  * function to encapsulate the logic.
 386  *
 387  * The block size is a rounded square root of file length.
 388  *
 389  * The checksum size is determined according to:
 390  *     blocksum_bits = BLOCKSUM_BIAS + 2*log2(file_len) - log2(block_len)
 391  * provided by Donovan Baarda which gives a probability of rsync
 392  * algorithm corrupting data and falling back using the whole md4
 393  * checksums.
 394  *
 395  * This might be made one of several selectable heuristics.
 396  */
 397 static void sum_sizes_sqroot(struct sum_struct *sum, int64 len)
 398 {
 399         int32 blength;
 400         int s2length;
 401
 402         if (block_size)
 403                 blength = block_size;
 404         else if (len <= BLOCK_SIZE * BLOCK_SIZE)
 405                 blength = BLOCK_SIZE;
 406         else {
 407                 int32 c;
 408                 int64 l;
 409                 int cnt;
 410                 for (c = 1, l = len, cnt = 0; l >>= 2; c <<= 1, cnt++) {}
 411                 if (cnt >= 31 || c >= MAX_BLOCK_SIZE)
 412                         blength = MAX_BLOCK_SIZE;
 413                 else {
 414                     blength = 0;
 415                     do {
 416                             blength |= c;
 417                             if (len < (int64)blength * blength)
 418                                     blength &= ~c;
 419                             c >>= 1;
 420                     } while (c >= 8);   /* round to multiple of 8 */
 421                     blength = MAX(blength, BLOCK_SIZE);
 422                 }
 423         }
 424
 425         if (protocol_version < 27) {
 426                 s2length = csum_length;
 427         } else if (csum_length == SUM_LENGTH) {
 428                 s2length = SUM_LENGTH;
 429         } else {
 430                 int32 c;
 431                 int64 l;
 432                 int b = BLOCKSUM_BIAS;
 433                 for (l = len; l >>= 1; b += 2) {}
 434                 for (c = blength; c >>= 1 && b; b--) {}
 435                 /* add a bit, subtract rollsum, round up. */
 436                 s2length = (b + 1 - 32 + 7) / 8; /* --optimize in compiler-- */
 437                 s2length = MAX(s2length, csum_length);
 438                 s2length = MIN(s2length, SUM_LENGTH);
 439         }
 440
 441         sum->flength    = len;
 442         sum->blength    = blength;
 443         sum->s2length   = s2length;
 444         sum->count      = (len + (blength - 1)) / blength;
 445         sum->remainder  = (len % blength);
 446
 447         if (sum->count && verbose > 2) {
 448                 rprintf(FINFO,
 449                         "count=%.0f rem=%ld blength=%ld s2length=%d flength=%.0f\n",
 450                         (double)sum->count, (long)sum->remainder, (long)sum->blength,
 451                         sum->s2length, (double)sum->flength);
 452         }
 453 }
 454
 455
 456 /*
 457  * Generate and send a stream of signatures/checksums that describe a buffer
 458  *
 459  * Generate approximately one checksum every block_len bytes.
 460  */
 461 static void generate_and_send_sums(int fd, OFF_T len, int f_out, int f_copy)
 462 {
 463         int32 i;
 464         struct map_struct *mapbuf;
 465         struct sum_struct sum;
 466         OFF_T offset = 0;
 467
 468         sum_sizes_sqroot(&sum, len);
 469
 470         if (len > 0)
 471                 mapbuf = map_file(fd, len, MAX_MAP_SIZE, sum.blength);
 472         else
 473                 mapbuf = NULL;
 474
 475         write_sum_head(f_out, &sum);
 476
 477         for (i = 0; i < sum.count; i++) {
 478                 int32 n1 = (int32)MIN(len, (OFF_T)sum.blength);
 479                 char *map = map_ptr(mapbuf, offset, n1);
 480                 uint32 sum1 = get_checksum1(map, n1);
 481                 char sum2[SUM_LENGTH];
 482
 483                 if (f_copy >= 0)
 484                         full_write(f_copy, map, n1);
 485
 486                 get_checksum2(map, n1, sum2);
 487
 488                 if (verbose > 3) {
 489                         rprintf(FINFO,
 490                                 "chunk[%.0f] offset=%.0f len=%ld sum1=%08lx\n",
 491                                 (double)i, (double)offset, (long)n1,
 492                                 (unsigned long)sum1);
 493                 }
 494                 write_int(f_out, sum1);
 495                 write_buf(f_out, sum2, sum.s2length);
 496                 len -= n1;
 497                 offset += n1;
 498         }
 499
 500         if (mapbuf)
 501                 unmap_file(mapbuf);
 502 }
 503
 504
 505 /* Try to find a filename in the same dir as "fname" with a similar name. */
 506 static int find_fuzzy(struct file_struct *file, struct file_list *dirlist)
 507 {
 508         int fname_len, fname_suf_len;
 509         const char *fname_suf, *fname = file->basename;
 510         uint32 lowest_dist = 0x7FFFFFFF;
 511         int j, lowest_j = -1;
 512
 513         fname_len = strlen(fname);
 514         fname_suf = find_filename_suffix(fname, fname_len, &fname_suf_len);
 515
 516         for (j = 0; j < dirlist->count; j++) {
 517                 struct file_struct *fp = dirlist->files[j];
 518                 const char *suf, *name;
 519                 int len, suf_len;
 520                 uint32 dist;
 521
 522                 if (!S_ISREG(fp->mode) || !fp->length
 523                     || fp->flags & FLAG_NO_FUZZY)
 524                         continue;
 525
 526                 name = fp->basename;
 527
 528                 if (fp->length == file->length
 529                     && fp->modtime == file->modtime) {
 530                         if (verbose > 4) {
 531                                 rprintf(FINFO,
 532                                         "fuzzy size/modtime match for %s\n",
 533                                         name);
 534                         }
 535                         return j;
 536                 }
 537
 538                 len = strlen(name);
 539                 suf = find_filename_suffix(name, len, &suf_len);
 540
 541                 dist = fuzzy_distance(name, len, fname, fname_len);
 542                 /* Add some extra weight to how well the suffixes match. */
 543                 dist += fuzzy_distance(suf, suf_len, fname_suf, fname_suf_len)
 544                       * 10;
 545                 if (verbose > 4) {
 546                         rprintf(FINFO, "fuzzy distance for %s = %d.%05d\n",
 547                                 name, (int)(dist>>16), (int)(dist&0xFFFF));
 548                 }
 549                 if (dist <= lowest_dist) {
 550                         lowest_dist = dist;
 551                         lowest_j = j;
 552                 }
 553         }
 554
 555         return lowest_j;
 556 }
 557
 558 void check_for_finished_hlinks(int itemizing, enum logcode code)
 559 {
 560         struct file_struct *file;
 561         int ndx;
 562
 563         while ((ndx = get_hlink_num()) != -1) {
 564                 if (ndx < 0 || ndx >= the_file_list->count)
 565                         continue;
 566
 567                 file = the_file_list->files[ndx];
 568                 if (!file->link_u.links)
 569                         continue;
 570
 571                 hard_link_cluster(file, ndx, itemizing, code);
 572         }
 573 }
 574
 575 static int phase = 0;
 576
 577 /* Acts on the_file_list->file's ndx'th item, whose name is fname.  If a dir,
 578  * make sure it exists, and has the right permissions/timestamp info.  For
 579  * all other non-regular files (symlinks, etc.) we create them here.  For
 580  * regular files that have changed, we try to find a basis file and then
 581  * start sending checksums.
 582  *
 583  * Note that f_out is set to -1 when doing final directory-permission and
 584  * modification-time repair. */
 585 static void recv_generator(char *fname, struct file_struct *file, int ndx,
 586                            int itemizing, int maybe_PERMS_REPORT,
 587                            enum logcode code, int f_out)
 588 {
 589         static int missing_below = -1, excluded_below = -1;
 590         static char *fuzzy_dirname = "";
 591         static struct file_list *fuzzy_dirlist = NULL;
 592         struct file_struct *fuzzy_file = NULL;
 593         int fd = -1, f_copy = -1;
 594         STRUCT_STAT st, real_st, partial_st;
 595         struct file_struct *back_file = NULL;
 596         int statret, real_ret, stat_errno;
 597         char *fnamecmp, *partialptr, *backupptr = NULL;
 598         char fnamecmpbuf[MAXPATHLEN];
 599         uchar fnamecmp_type;
 600
 601         if (list_only)
 602                 return;
 603
 604         if (!fname) {
 605                 if (fuzzy_dirlist) {
 606                         flist_free(fuzzy_dirlist);
 607                         fuzzy_dirlist = NULL;
 608                         fuzzy_dirname = "";
 609                 }
 610                 if (missing_below >= 0) {
 611                         dry_run--;
 612                         missing_below = -1;
 613                 }
 614                 return;
 615         }
 616
 617         if (verbose > 2) {
 618                 rprintf(FINFO, "recv_generator(%s,%d)\n",
 619                         safe_fname(fname), ndx);
 620         }
 621
 622         if (server_filter_list.head) {
 623                 if (excluded_below >= 0) {
 624                         if (file->dir.depth > excluded_below)
 625                                 goto skipping;
 626                         excluded_below = -1;
 627                 }
 628                 if (check_filter(&server_filter_list, fname,
 629                                  S_ISDIR(file->mode)) < 0) {
 630                         if (S_ISDIR(file->mode))
 631                                 excluded_below = file->dir.depth;
 632                     skipping:
 633                         if (verbose) {
 634                                 rprintf(FINFO,
 635                                         "skipping server-excluded file \"%s\"\n",
 636                                         safe_fname(fname));
 637                         }
 638                         return;
 639                 }
 640         }
 641
 642         if (missing_below >= 0 && file->dir.depth <= missing_below) {
 643                 dry_run--;
 644                 missing_below = -1;
 645         }
 646         if (dry_run > 1) {
 647                 statret = -1;
 648                 stat_errno = ENOENT;
 649         } else {
 650                 if (fuzzy_basis && S_ISREG(file->mode)) {
 651                         char *dn = file->dirname ? file->dirname : ".";
 652                         if (fuzzy_dirname != dn
 653                             && strcmp(fuzzy_dirname, dn) != 0) {
 654                                 if (fuzzy_dirlist)
 655                                         flist_free(fuzzy_dirlist);
 656                                 fuzzy_dirlist = get_dirlist(dn, -1, 1);
 657                         }
 658                         fuzzy_dirname = dn;
 659                 }
 660
 661                 statret = link_stat(fname, &st,
 662                                     keep_dirlinks && S_ISDIR(file->mode));
 663                 stat_errno = errno;
 664         }
 665
 666         if (only_existing && statret == -1 && stat_errno == ENOENT) {
 667                 /* we only want to update existing files */
 668                 if (verbose > 1) {
 669                         rprintf(FINFO, "not creating new file \"%s\"\n",
 670                                 safe_fname(fname));
 671                 }
 672                 return;
 673         }
 674
 675         if (statret == 0 && !preserve_perms
 676             && S_ISDIR(st.st_mode) == S_ISDIR(file->mode)) {
 677                 /* if the file exists already and we aren't perserving
 678                  * permissions then act as though the remote end sent
 679                  * us the file permissions we already have */
 680                 file->mode = (file->mode & ~CHMOD_BITS)
 681                            | (st.st_mode & CHMOD_BITS);
 682         }
 683
 684         if (S_ISDIR(file->mode)) {
 685                 /* The file to be received is a directory, so we need
 686                  * to prepare appropriately.  If there is already a
 687                  * file of that name and it is *not* a directory, then
 688                  * we need to delete it.  If it doesn't exist, then
 689                  * (perhaps recursively) create it. */
 690                 if (statret == 0 && !S_ISDIR(st.st_mode)) {
 691                         if (delete_item(fname, st.st_mode, DEL_TERSE) < 0)
 692                                 return;
 693                         statret = -1;
 694                 }
 695                 if (dry_run && statret != 0 && missing_below < 0) {
 696                         missing_below = file->dir.depth;
 697                         dry_run++;
 698                 }
 699                 if (itemizing && f_out != -1) {
 700                         itemize(file, ndx, statret, &st,
 701                                 statret ? ITEM_LOCAL_CHANGE : 0, 0, NULL);
 702                 }
 703                 if (statret != 0 && do_mkdir(fname,file->mode) != 0 && errno != EEXIST) {
 704                         if (!relative_paths || errno != ENOENT
 705                             || create_directory_path(fname, orig_umask) < 0
 706                             || do_mkdir(fname, file->mode) < 0) {
 707                                 rsyserr(FERROR, errno,
 708                                         "recv_generator: mkdir %s failed",
 709                                         full_fname(fname));
 710                         }
 711                 }
 712                 if (set_perms(fname, file, statret ? NULL : &st, 0)
 713                     && verbose && code && f_out != -1)
 714                         rprintf(code, "%s/\n", safe_fname(fname));
 715                 if (delete_during && f_out != -1 && !phase && dry_run < 2
 716                     && (file->flags & FLAG_DEL_HERE))
 717                         delete_in_dir(the_file_list, fname, file);
 718                 return;
 719         }
 720
 721         if (max_size && file->length > max_size) {
 722                 if (verbose > 1) {
 723                         rprintf(FINFO, "%s is over max-size\n",
 724                                 safe_fname(fname));
 725                 }
 726                 return;
 727         }
 728
 729         if (preserve_links && S_ISLNK(file->mode)) {
 730 #ifdef SUPPORT_LINKS
 731                 if (safe_symlinks && unsafe_symlink(file->u.link, fname)) {
 732                         if (verbose) {
 733                                 rprintf(FINFO,
 734                                         "ignoring unsafe symlink %s -> \"%s\"\n",
 735                                         full_fname(fname),
 736                                         safe_fname(file->u.link));
 737                         }
 738                         return;
 739                 }
 740                 if (statret == 0) {
 741                         char lnk[MAXPATHLEN];
 742                         int len;
 743
 744                         if (!S_ISDIR(st.st_mode)
 745                             && (len = readlink(fname, lnk, MAXPATHLEN-1)) > 0) {
 746                                 lnk[len] = 0;
 747                                 /* A link already pointing to the
 748                                  * right place -- no further action
 749                                  * required. */
 750                                 if (strcmp(lnk, file->u.link) == 0) {
 751                                         if (itemizing) {
 752                                                 itemize(file, ndx, 0, &st, 0,
 753                                                         0, NULL);
 754                                         }
 755                                         set_perms(fname, file, &st,
 756                                                   maybe_PERMS_REPORT);
 757                                         return;
 758                                 }
 759                         }
 760                         /* Not the right symlink (or not a symlink), so
 761                          * delete it. */
 762                         if (delete_item(fname, st.st_mode, DEL_TERSE) < 0)
 763                                 return;
 764                         if (!S_ISLNK(st.st_mode))
 765                                 statret = -1;
 766                 }
 767                 if (do_symlink(file->u.link,fname) != 0) {
 768                         rsyserr(FERROR, errno, "symlink %s -> \"%s\" failed",
 769                                 full_fname(fname), safe_fname(file->u.link));
 770                 } else {
 771                         set_perms(fname,file,NULL,0);
 772                         if (itemizing) {
 773                                 itemize(file, ndx, statret, &st,
 774                                         ITEM_LOCAL_CHANGE, 0, NULL);
 775                         }
 776                         if (code && verbose) {
 777                                 rprintf(code, "%s -> %s\n", safe_fname(fname),
 778                                         safe_fname(file->u.link));
 779                         }
 780                         if (remove_sent_files && !dry_run) {
 781                                 char numbuf[4];
 782                                 SIVAL(numbuf, 0, ndx);
 783                                 send_msg(MSG_SUCCESS, numbuf, 4);
 784                         }
 785                 }
 786 #endif
 787                 return;
 788         }
 789
 790         if (am_root && preserve_devices && IS_DEVICE(file->mode)) {
 791                 if (statret != 0 ||
 792                     st.st_mode != file->mode ||
 793                     st.st_rdev != file->u.rdev) {
 794                         if (delete_item(fname, st.st_mode, DEL_TERSE) < 0)
 795                                 return;
 796                         if (!IS_DEVICE(st.st_mode))
 797                                 statret = -1;
 798                         if (verbose > 2) {
 799                                 rprintf(FINFO,"mknod(%s,0%o,0x%x)\n",
 800                                         safe_fname(fname),
 801                                         (int)file->mode, (int)file->u.rdev);
 802                         }
 803                         if (do_mknod(fname,file->mode,file->u.rdev) != 0) {
 804                                 rsyserr(FERROR, errno, "mknod %s failed",
 805                                         full_fname(fname));
 806                         } else {
 807                                 set_perms(fname,file,NULL,0);
 808                                 if (itemizing) {
 809                                         itemize(file, ndx, statret, &st,
 810                                                 ITEM_LOCAL_CHANGE, 0, NULL);
 811                                 }
 812                                 if (code && verbose) {
 813                                         rprintf(code, "%s\n",
 814                                                 safe_fname(fname));
 815                                 }
 816                         }
 817                 } else {
 818                         if (itemizing)
 819                                 itemize(file, ndx, statret, &st, 0, 0, NULL);
 820                         set_perms(fname, file, &st, maybe_PERMS_REPORT);
 821                 }
 822                 return;
 823         }
 824
 825         if (preserve_hard_links && hard_link_check(file, ndx, HL_CHECK_MASTER))
 826                 return;
 827
 828         if (!S_ISREG(file->mode)) {
 829                 rprintf(FINFO, "skipping non-regular file \"%s\"\n",
 830                         safe_fname(fname));
 831                 return;
 832         }
 833
 834         if (opt_ignore_existing && statret == 0) {
 835                 if (verbose > 1)
 836                         rprintf(FINFO, "%s exists\n", safe_fname(fname));
 837                 return;
 838         }
 839
 840         if (update_only && statret == 0
 841             && cmp_modtime(st.st_mtime, file->modtime) > 0) {
 842                 if (verbose > 1)
 843                         rprintf(FINFO, "%s is newer\n", safe_fname(fname));
 844                 return;
 845         }
 846
 847         fnamecmp = fname;
 848         fnamecmp_type = FNAMECMP_FNAME;
 849
 850         if (statret == 0 && !S_ISREG(st.st_mode)) {
 851                 if (delete_item(fname, st.st_mode, DEL_TERSE) != 0)
 852                         return;
 853                 statret = -1;
 854                 stat_errno = ENOENT;
 855         }
 856
 857         if (statret != 0 && basis_dir[0] != NULL) {
 858                 int best_match = -1;
 859                 int match_level = 0;
 860                 int i = 0;
 861                 do {
 862                         pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 863                                  basis_dir[i], fname);
 864                         if (link_stat(fnamecmpbuf, &st, 0) < 0
 865                             || !S_ISREG(st.st_mode))
 866                                 continue;
 867                         switch (match_level) {
 868                         case 0:
 869                                 best_match = i;
 870                                 match_level = 1;
 871                                 /* FALL THROUGH */
 872                         case 1:
 873                                 if (!unchanged_file(fnamecmpbuf, file, &st))
 874                                         continue;
 875                                 best_match = i;
 876                                 match_level = 2;
 877                                 if (copy_dest)
 878                                         break;
 879                                 /* FALL THROUGH */
 880                         case 2:
 881                                 if (!unchanged_attrs(file, &st))
 882                                         continue;
 883                                 best_match = i;
 884                                 match_level = 3;
 885                                 break;
 886                         }
 887                         break;
 888                 } while (basis_dir[++i] != NULL);
 889                 if (match_level) {
 890                         statret = 0;
 891                         if (i != best_match) {
 892                                 i = best_match;
 893                                 pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 894                                          basis_dir[i], fname);
 895                                 if (link_stat(fnamecmpbuf, &st, 0) < 0) {
 896                                         match_level = 0;
 897                                         statret = -1;
 898                                         stat_errno = errno;
 899                                 }
 900                         }
 901 #ifdef HAVE_LINK
 902                         if (link_dest && match_level == 3) {
 903                                 if (hard_link_one(file, ndx, fname, -1, &st,
 904                                                   fnamecmpbuf, 1,
 905                                                   itemizing && verbose > 1,
 906                                                   code) == 0)
 907                                         return;
 908                                 if (verbose) {
 909                                         rsyserr(FINFO, errno, "link %s => %s",
 910                                                 full_fname(fnamecmpbuf),
 911                                                 safe_fname(fname));
 912                                 }
 913                                 match_level = 2;
 914                         }
 915 #endif
 916                         if (match_level == 2) {
 917                                 /* Copy the file locally. */
 918                                 if (copy_file(fnamecmpbuf, fname, file->mode) < 0) {
 919                                         if (verbose) {
 920                                                 rsyserr(FINFO, errno,
 921                                                         "copy_file %s => %s",
 922                                                         full_fname(fnamecmpbuf),
 923                                                         safe_fname(fname));
 924                                         }
 925                                         match_level = 0;
 926                                         statret = -1;
 927                                 } else
 928                                         set_perms(fname, file, NULL, 0);
 929                         } else if (compare_dest || match_level == 1) {
 930                                 fnamecmp = fnamecmpbuf;
 931                                 fnamecmp_type = i;
 932                         }
 933                 }
 934         }
 935
 936         real_ret = statret;
 937         real_st = st;
 938
 939         if (partial_dir && (partialptr = partial_dir_fname(fname)) != NULL
 940             && link_stat(partialptr, &partial_st, 0) == 0
 941             && S_ISREG(partial_st.st_mode)) {
 942                 if (statret != 0)
 943                         goto prepare_to_open;
 944         } else
 945                 partialptr = NULL;
 946
 947         if (statret != 0 && fuzzy_basis && dry_run <= 1) {
 948                 int j = find_fuzzy(file, fuzzy_dirlist);
 949                 if (j >= 0) {
 950                         fuzzy_file = fuzzy_dirlist->files[j];
 951                         f_name_to(fuzzy_file, fnamecmpbuf);
 952                         if (verbose > 2) {
 953                                 rprintf(FINFO, "fuzzy basis selected for %s: %s\n",
 954                                         safe_fname(fname), safe_fname(fnamecmpbuf));
 955                         }
 956                         st.st_size = fuzzy_file->length;
 957                         statret = 0;
 958                         fnamecmp = fnamecmpbuf;
 959                         fnamecmp_type = FNAMECMP_FUZZY;
 960                 }
 961         }
 962
 963         if (statret != 0) {
 964                 if (preserve_hard_links && hard_link_check(file, ndx, HL_SKIP))
 965                         return;
 966                 if (stat_errno == ENOENT)
 967                         goto notify_others;
 968                 if (verbose > 1) {
 969                         rsyserr(FERROR, stat_errno,
 970                                 "recv_generator: failed to stat %s",
 971                                 full_fname(fname));
 972                 }
 973                 return;
 974         }
 975
 976         if (!compare_dest && fnamecmp_type <= FNAMECMP_BASIS_DIR_HIGH)
 977                 ;
 978         else if (fnamecmp_type == FNAMECMP_FUZZY)
 979                 ;
 980         else if (unchanged_file(fnamecmp, file, &st)) {
 981                 if (fnamecmp_type == FNAMECMP_FNAME) {
 982                         if (itemizing) {
 983                                 itemize(file, ndx, real_ret, &real_st,
 984                                         0, 0, NULL);
 985                         }
 986                         set_perms(fname, file, &st, maybe_PERMS_REPORT);
 987                         if (preserve_hard_links && file->link_u.links)
 988                                 hard_link_cluster(file, ndx, itemizing, code);
 989                         return;
 990                 }
 991                 /* Only --compare-dest gets here. */
 992                 itemize(file, ndx, real_ret, &real_st,
 993                         ITEM_NO_DEST_AND_NO_UPDATE, 0, NULL);
 994                 return;
 995         }
 996
 997 prepare_to_open:
 998         if (partialptr) {
 999                 st = partial_st;
1000                 fnamecmp = partialptr;
1001                 fnamecmp_type = FNAMECMP_PARTIAL_DIR;
1002                 statret = 0;
1003         }
1004
1005         if (dry_run || read_batch || whole_file)
1006                 goto notify_others;
1007
1008         if (fuzzy_basis) {
1009                 int j = flist_find(fuzzy_dirlist, file);
1010                 if (j >= 0) /* don't use changing file as future fuzzy basis */
1011                         fuzzy_dirlist->files[j]->flags |= FLAG_NO_FUZZY;
1012         }
1013
1014         /* open the file */
1015         fd = do_open(fnamecmp, O_RDONLY, 0);
1016
1017         if (fd == -1) {
1018                 rsyserr(FERROR, errno, "failed to open %s, continuing",
1019                         full_fname(fnamecmp));
1020             pretend_missing:
1021                 /* pretend the file didn't exist */
1022                 if (preserve_hard_links && hard_link_check(file, ndx, HL_SKIP))
1023                         return;
1024                 statret = real_ret = -1;
1025                 goto notify_others;
1026         }
1027
1028         if (inplace && make_backups && fnamecmp_type == FNAMECMP_FNAME) {
1029                 if (!(backupptr = get_backup_name(fname))) {
1030                         close(fd);
1031                         return;
1032                 }
1033                 if (!(back_file = make_file(fname, NULL, NO_FILTERS))) {
1034                         close(fd);
1035                         goto pretend_missing;
1036                 }
1037                 if (robust_unlink(backupptr) && errno != ENOENT) {
1038                         rsyserr(FERROR, errno, "unlink %s",
1039                                 full_fname(backupptr));
1040                         free(back_file);
1041                         close(fd);
1042                         return;
1043                 }
1044                 if ((f_copy = do_open(backupptr,
1045                     O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0600)) < 0) {
1046                         rsyserr(FERROR, errno, "open %s",
1047                                 full_fname(backupptr));
1048                         free(back_file);
1049                         close(fd);
1050                         return;
1051                 }
1052                 fnamecmp_type = FNAMECMP_BACKUP;
1053         }
1054
1055         if (verbose > 3) {
1056                 rprintf(FINFO, "gen mapped %s of size %.0f\n",
1057                         safe_fname(fnamecmp), (double)st.st_size);
1058         }
1059
1060         if (verbose > 2)
1061                 rprintf(FINFO, "generating and sending sums for %d\n", ndx);
1062
1063 notify_others:
1064         write_int(f_out, ndx);
1065         if (itemizing) {
1066                 int iflags = ITEM_TRANSFER;
1067                 if (always_checksum)
1068                         iflags |= ITEM_REPORT_CHECKSUM;
1069                 if (fnamecmp_type != FNAMECMP_FNAME)
1070                         iflags |= ITEM_BASIS_TYPE_FOLLOWS;
1071                 if (fnamecmp_type == FNAMECMP_FUZZY)
1072                         iflags |= ITEM_XNAME_FOLLOWS;
1073                 itemize(file, -1, real_ret, &real_st, iflags, fnamecmp_type,
1074                         fuzzy_file ? fuzzy_file->basename : NULL);
1075         }
1076
1077         if (dry_run) {
1078                 if (preserve_hard_links && file->link_u.links)
1079                         hard_link_cluster(file, ndx, itemizing, code);
1080                 return;
1081         }
1082         if (read_batch)
1083                 return;
1084
1085         if (statret != 0 || whole_file) {
1086                 write_sum_head(f_out, NULL);
1087                 return;
1088         }
1089
1090         generate_and_send_sums(fd, st.st_size, f_out, f_copy);
1091
1092         if (f_copy >= 0) {
1093                 close(f_copy);
1094                 set_perms(backupptr, back_file, NULL, 0);
1095                 if (verbose > 1) {
1096                         rprintf(FINFO, "backed up %s to %s\n",
1097                                 safe_fname(fname), safe_fname(backupptr));
1098                 }
1099                 free(back_file);
1100         }
1101
1102         close(fd);
1103 }
1104
1105
1106 void generate_files(int f_out, struct file_list *flist, char *local_name)
1107 {
1108         int i, lull_mod;
1109         char fbuf[MAXPATHLEN];
1110         int itemizing, maybe_PERMS_REPORT;
1111         enum logcode code;
1112         int need_retouch_dir_times = preserve_times && !omit_dir_times;
1113         int need_retouch_dir_perms = 0;
1114         int save_only_existing = only_existing;
1115         int save_opt_ignore_existing = opt_ignore_existing;
1116
1117         allowed_lull = read_batch ? 0 : (io_timeout + 1) / 2;
1118         lull_mod = allowed_lull * 5;
1119
1120         if (protocol_version >= 29) {
1121                 itemizing = 1;
1122                 maybe_PERMS_REPORT = log_format_has_i ? 0 : PERMS_REPORT;
1123                 code = daemon_log_format_has_i ? 0 : FLOG;
1124         } else if (am_daemon) {
1125                 itemizing = daemon_log_format_has_i && !dry_run;
1126                 maybe_PERMS_REPORT = PERMS_REPORT;
1127                 code = itemizing || dry_run ? FCLIENT : FINFO;
1128         } else if (!am_server) {
1129                 itemizing = log_format_has_i;
1130                 maybe_PERMS_REPORT = log_format_has_i ? 0 : PERMS_REPORT;
1131                 code = itemizing ? 0 : FINFO;
1132         } else {
1133                 itemizing = 0;
1134                 maybe_PERMS_REPORT = PERMS_REPORT;
1135                 code = FINFO;
1136         }
1137
1138         if (verbose > 2) {
1139                 rprintf(FINFO, "generator starting pid=%ld count=%d\n",
1140                         (long)getpid(), flist->count);
1141         }
1142
1143         if (delete_before && !local_name && flist->count > 0)
1144                 do_delete_pass(flist);
1145
1146         if (whole_file < 0)
1147                 whole_file = 0;
1148         if (verbose >= 2) {
1149                 rprintf(FINFO, "delta-transmission %s\n",
1150                         whole_file
1151                         ? "disabled for local transfer or --whole-file"
1152                         : "enabled");
1153         }
1154
1155         if (protocol_version < 29)
1156                 ignore_timeout = 1;
1157
1158         for (i = 0; i < flist->count; i++) {
1159                 struct file_struct *file = flist->files[i];
1160
1161                 if (!file->basename)
1162                         continue;
1163
1164                 recv_generator(local_name ? local_name : f_name_to(file, fbuf),
1165                                file, i, itemizing, maybe_PERMS_REPORT, code,
1166                                f_out);
1167
1168                 /* We need to ensure that any dirs we create have writeable
1169                  * permissions during the time we are putting files within
1170                  * them.  This is then fixed after the transfer is done. */
1171                 if (!am_root && S_ISDIR(file->mode) && !(file->mode & S_IWUSR)) {
1172                         int mode = file->mode | S_IWUSR; /* user write */
1173                         char *fname = local_name ? local_name : fbuf;
1174                         if (do_chmod(fname, mode & CHMOD_BITS) < 0) {
1175                                 rsyserr(FERROR, errno,
1176                                         "failed to modify permissions on %s",
1177                                         full_fname(fname));
1178                         }
1179                         need_retouch_dir_perms = 1;
1180                 }
1181
1182                 if (preserve_hard_links)
1183                         check_for_finished_hlinks(itemizing, code);
1184
1185                 if (allowed_lull && !(i % lull_mod))
1186                         maybe_send_keepalive();
1187         }
1188         recv_generator(NULL, NULL, 0, 0, 0, code, -1);
1189         if (delete_during)
1190                 delete_in_dir(NULL, NULL, NULL);
1191
1192         phase++;
1193         csum_length = SUM_LENGTH;
1194         only_existing = max_size = opt_ignore_existing = 0;
1195         update_only = always_checksum = size_only = 0;
1196         ignore_times = 1;
1197         make_backups = 0; /* avoid a duplicate backup for inplace processing */
1198
1199         /* We expect to just sit around now, so don't exit on a timeout.
1200          * If we really get a timeout then the other process should exit. */
1201         ignore_timeout = 1;
1202
1203         if (verbose > 2)
1204                 rprintf(FINFO,"generate_files phase=%d\n",phase);
1205
1206         write_int(f_out, -1);
1207
1208         /* files can cycle through the system more than once
1209          * to catch initial checksum errors */
1210         while ((i = get_redo_num(itemizing, code)) != -1) {
1211                 struct file_struct *file = flist->files[i];
1212                 recv_generator(local_name ? local_name : f_name_to(file, fbuf),
1213                                file, i, itemizing, maybe_PERMS_REPORT, code,
1214                                f_out);
1215         }
1216
1217         phase++;
1218         only_existing = save_only_existing;
1219         opt_ignore_existing = save_opt_ignore_existing;
1220
1221         if (verbose > 2)
1222                 rprintf(FINFO,"generate_files phase=%d\n",phase);
1223
1224         write_int(f_out, -1);
1225
1226         /* Read post-redo-phase MSG_DONE and any prior messages. */
1227         get_redo_num(itemizing, code);
1228
1229         if (delete_after && !local_name && flist->count > 0)
1230                 do_delete_pass(flist);
1231
1232         if ((need_retouch_dir_perms || need_retouch_dir_times)
1233             && !list_only && !local_name && !dry_run) {
1234                 int j = 0;
1235                 /* Now we need to fix any directory permissions that were
1236                  * modified during the transfer and/or re-set any tweaked
1237                  * modified-time values. */
1238                 for (i = 0; i < flist->count; i++) {
1239                         struct file_struct *file = flist->files[i];
1240                         if (!file->basename || !S_ISDIR(file->mode))
1241                                 continue;
1242                         if (!need_retouch_dir_times && file->mode & S_IWUSR)
1243                                 continue;
1244                         recv_generator(f_name(file), file, i, itemizing,
1245                                        maybe_PERMS_REPORT, code, -1);
1246                         if (allowed_lull && !(j++ % lull_mod))
1247                                 maybe_send_keepalive();
1248                 }
1249         }
1250         recv_generator(NULL, NULL, 0, 0, 0, code, -1);
1251
1252         if (max_delete > 0 && deletion_count > max_delete) {
1253                 rprintf(FINFO,
1254                         "Deletions stopped due to --max-delete limit (%d skipped)\n",
1255                         deletion_count - max_delete);
1256                 io_error |= IOERR_DEL_LIMIT;
1257         }
1258
1259         if (protocol_version >= 29) {
1260                 write_int(f_out, -1);
1261                 /* Read post-delay-phase MSG_DONE and any prior messages. */
1262                 get_redo_num(itemizing, code);
1263         }
1264
1265         if (verbose > 2)
1266                 rprintf(FINFO,"generate_files finished\n");
1267 }