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 ignore_timeout;
  62 extern int protocol_version;
  63 extern int fuzzy_basis;
  64 extern int always_checksum;
  65 extern char *partial_dir;
  66 extern char *basis_dir[];
  67 extern int compare_dest;
  68 extern int link_dest;
  69 extern int whole_file;
  70 extern int local_server;
  71 extern int list_only;
  72 extern int read_batch;
  73 extern int only_existing;
  74 extern int orig_umask;
  75 extern int safe_symlinks;
  76 extern long block_size; /* "long" because popt can't set an int32. */
  77 extern int max_delete;
  78 extern int force_delete;
  79 extern int one_file_system;
  80 extern struct stats stats;
  81 extern dev_t filesystem_dev;
  82 extern char *backup_dir;
  83 extern char *backup_suffix;
  84 extern int backup_suffix_len;
  85
  86 extern struct filter_list_struct server_filter_list;
  87
  88 static int deletion_count = 0; /* used to implement --max-delete */
  89
  90
  91 static int is_backup_file(char *fn)
  92 {
  93         int k = strlen(fn) - backup_suffix_len;
  94         return k > 0 && strcmp(fn+k, backup_suffix) == 0;
  95 }
  96
  97
  98 /* Delete a file or directory.  If DEL_FORCE_RECURSE is set in the flags, or if
  99  * force_delete is set, this will delete recursively as long as DEL_NO_RECURSE
 100  * is not set in the flags. */
 101 static int delete_item(char *fname, int mode, int flags)
 102 {
 103         struct file_list *dirlist;
 104         char buf[MAXPATHLEN];
 105         int j, dlen, zap_dir, ok;
 106         void *save_filters;
 107
 108         if (max_delete && deletion_count >= max_delete)
 109                 return -1;
 110
 111         if (!S_ISDIR(mode)) {
 112                 if (make_backups && (backup_dir || !is_backup_file(fname)))
 113                         ok = make_backup(fname);
 114                 else
 115                         ok = robust_unlink(fname) == 0;
 116                 if (ok) {
 117                         if (!(flags & DEL_TERSE))
 118                                 log_delete(fname, mode);
 119                         deletion_count++;
 120                         return 0;
 121                 }
 122                 if (errno == ENOENT)
 123                         return 0;
 124                 rsyserr(FERROR, errno, "delete_file: unlink %s failed",
 125                         full_fname(fname));
 126                 return -1;
 127         }
 128
 129         zap_dir = (flags & DEL_FORCE_RECURSE || (force_delete && recurse))
 130                 && !(flags & DEL_NO_RECURSE);
 131         if (dry_run && zap_dir) {
 132                 ok = 0;
 133                 errno = ENOTEMPTY;
 134         } else if (make_backups && !backup_dir && !is_backup_file(fname)
 135             && !(flags & DEL_FORCE_RECURSE))
 136                 ok = make_backup(fname);
 137         else
 138                 ok = do_rmdir(fname) == 0;
 139         if (ok) {
 140                 if (!(flags & DEL_TERSE))
 141                         log_delete(fname, mode);
 142                 deletion_count++;
 143                 return 0;
 144         }
 145         if (errno == ENOENT)
 146                 return 0;
 147         if (!zap_dir || (errno != ENOTEMPTY && errno != EEXIST)) {
 148                 rsyserr(FERROR, errno, "delete_file: rmdir %s failed",
 149                         full_fname(fname));
 150                 return -1;
 151         }
 152         flags |= DEL_FORCE_RECURSE;
 153
 154         dlen = strlcpy(buf, fname, MAXPATHLEN);
 155         save_filters = push_local_filters(buf, dlen);
 156
 157         dirlist = get_dirlist(buf, dlen, 0);
 158         for (j = dirlist->count; j--; ) {
 159                 struct file_struct *fp = dirlist->files[j];
 160
 161                 if (fp->flags & FLAG_MOUNT_POINT)
 162                         continue;
 163
 164                 f_name_to(fp, buf);
 165                 if (delete_item(buf, fp->mode, flags & ~DEL_TERSE) != 0) {
 166                         flist_free(dirlist);
 167                         return -1;
 168                 }
 169         }
 170         flist_free(dirlist);
 171
 172         pop_local_filters(save_filters);
 173
 174         if (max_delete && deletion_count >= max_delete)
 175                 return -1;
 176
 177         if (do_rmdir(fname) == 0) {
 178                 if (!(flags & DEL_TERSE))
 179                         log_delete(fname, mode);
 180                 deletion_count++;
 181         } else if (errno != ENOTEMPTY && errno != ENOENT) {
 182                 rsyserr(FERROR, errno, "delete_file: rmdir %s failed",
 183                         full_fname(fname));
 184                 return -1;
 185         }
 186
 187         return 0;
 188 }
 189
 190
 191 /* This function is used to implement per-directory deletion, and is used by
 192  * all the --delete-WHEN options.  Note that the fbuf pointer must point to a
 193  * MAXPATHLEN buffer with the name of the directory in it (the functions we
 194  * call will append names onto the end, but the old dir value will be restored
 195  * on exit). */
 196 static void delete_in_dir(struct file_list *flist, char *fbuf,
 197                           struct file_struct *file, int allowed_lull)
 198 {
 199         static int min_depth = MAXPATHLEN, cur_depth = -1;
 200         static void *filt_array[MAXPATHLEN/2+1];
 201         struct file_list *dirlist;
 202         char delbuf[MAXPATHLEN];
 203         STRUCT_STAT st;
 204         int dlen, i;
 205
 206         if (!flist) {
 207                 while (cur_depth >= min_depth)
 208                         pop_local_filters(filt_array[cur_depth--]);
 209                 min_depth = MAXPATHLEN;
 210                 cur_depth = -1;
 211                 return;
 212         }
 213
 214         if (verbose > 2)
 215                 rprintf(FINFO, "delete_in_dir(%s)\n", safe_fname(fbuf));
 216
 217         if (allowed_lull)
 218                 maybe_send_keepalive(allowed_lull, flist->count);
 219
 220         if (file->dir.depth >= MAXPATHLEN/2+1)
 221                 return; /* Impossible... */
 222
 223         if (max_delete && deletion_count >= max_delete)
 224                 return;
 225
 226         if (io_error && !(lp_ignore_errors(module_id) || ignore_errors)) {
 227                 rprintf(FINFO,
 228                         "IO error encountered -- skipping file deletion\n");
 229                 max_delete = -1; /* avoid duplicating the above warning */
 230                 return;
 231         }
 232
 233         while (cur_depth >= file->dir.depth && cur_depth >= min_depth)
 234                 pop_local_filters(filt_array[cur_depth--]);
 235         cur_depth = file->dir.depth;
 236         if (min_depth > cur_depth)
 237                 min_depth = cur_depth;
 238         dlen = strlen(fbuf);
 239         filt_array[cur_depth] = push_local_filters(fbuf, dlen);
 240
 241         if (link_stat(fbuf, &st, keep_dirlinks) < 0)
 242                 return;
 243
 244         if (one_file_system && file->flags & FLAG_TOP_DIR)
 245                 filesystem_dev = st.st_dev;
 246
 247         dirlist = get_dirlist(fbuf, dlen, 0);
 248
 249         /* If an item in dirlist is not found in flist, delete it
 250          * from the filesystem. */
 251         for (i = dirlist->count; i--; ) {
 252                 if (!dirlist->files[i]->basename)
 253                         continue;
 254                 if (flist_find(flist, dirlist->files[i]) < 0) {
 255                         int mode = dirlist->files[i]->mode;
 256                         f_name_to(dirlist->files[i], delbuf);
 257                         if (delete_item(delbuf, mode, DEL_FORCE_RECURSE) < 0)
 258                                 break;
 259                 }
 260         }
 261
 262         flist_free(dirlist);
 263 }
 264
 265 /* This deletes any files on the receiving side that are not present on the
 266  * sending side.  This is used by --delete-before and --delete-after. */
 267 static void do_delete_pass(struct file_list *flist, int allowed_lull)
 268 {
 269         char fbuf[MAXPATHLEN];
 270         int j;
 271
 272         for (j = 0; j < flist->count; j++) {
 273                 struct file_struct *file = flist->files[j];
 274
 275                 if (!(file->flags & FLAG_DEL_HERE))
 276                         continue;
 277
 278                 f_name_to(file, fbuf);
 279                 if (verbose > 1 && file->flags & FLAG_TOP_DIR)
 280                         rprintf(FINFO, "deleting in %s\n", safe_fname(fbuf));
 281
 282                 delete_in_dir(flist, fbuf, file, allowed_lull);
 283         }
 284 }
 285
 286 static int unchanged_attrs(struct file_struct *file, STRUCT_STAT *st)
 287 {
 288         if (preserve_perms
 289          && (st->st_mode & CHMOD_BITS) != (file->mode & CHMOD_BITS))
 290                 return 0;
 291
 292         if (am_root && preserve_uid && st->st_uid != file->uid)
 293                 return 0;
 294
 295         if (preserve_gid && file->gid != GID_NONE && st->st_gid != file->gid)
 296                 return 0;
 297
 298         return 1;
 299 }
 300
 301
 302 #define SID_UPDATING              ITEM_UPDATING
 303 #define SID_REPORT_CHECKSUM       ITEM_REPORT_CHECKSUM
 304 #define SID_USING_ALT_BASIS       ITEM_USING_ALT_BASIS
 305 /* This flag doesn't get sent, so it must be outside 0xffff. */
 306 #define SID_NO_DEST_AND_NO_UPDATE (1<<16)
 307
 308 static void itemize(struct file_struct *file, int statret, STRUCT_STAT *st,
 309                     int32 sflags, int f_out, int ndx)
 310 {
 311         int iflags = sflags & 0xffff;
 312
 313         if (statret >= 0) {
 314                 if (S_ISREG(file->mode) && file->length != st->st_size)
 315                         iflags |= ITEM_REPORT_SIZE;
 316                 if (!(sflags & SID_NO_DEST_AND_NO_UPDATE)) {
 317                         int keep_time = !preserve_times ? 0
 318                             : S_ISDIR(file->mode) ? !omit_dir_times
 319                             : !S_ISLNK(file->mode);
 320
 321                         if ((iflags & ITEM_UPDATING && !keep_time)
 322                             || (keep_time && file->modtime != st->st_mtime))
 323                                 iflags |= ITEM_REPORT_TIME;
 324                         if (preserve_perms && file->mode != st->st_mode)
 325                                 iflags |= ITEM_REPORT_PERMS;
 326                         if (preserve_uid && am_root && file->uid != st->st_uid)
 327                                 iflags |= ITEM_REPORT_OWNER;
 328                         if (preserve_gid && file->gid != GID_NONE
 329                             && st->st_gid != file->gid)
 330                                 iflags |= ITEM_REPORT_GROUP;
 331                 }
 332         } else
 333                 iflags |= ITEM_IS_NEW | ITEM_UPDATING;
 334
 335         if ((iflags || verbose > 1) && !read_batch) {
 336                 if (protocol_version >= 29) {
 337                         if (ndx >= 0)
 338                                 write_int(f_out, ndx);
 339                         write_shortint(f_out, iflags);
 340                 } else if (ndx >= 0)
 341                         log_recv(file, &stats, iflags);
 342         }
 343 }
 344
 345
 346 /* Perform our quick-check heuristic for determining if a file is unchanged. */
 347 static int unchanged_file(char *fn, struct file_struct *file, STRUCT_STAT *st)
 348 {
 349         if (st->st_size != file->length)
 350                 return 0;
 351
 352         /* if always checksum is set then we use the checksum instead
 353            of the file time to determine whether to sync */
 354         if (always_checksum && S_ISREG(st->st_mode)) {
 355                 char sum[MD4_SUM_LENGTH];
 356                 file_checksum(fn, sum, st->st_size);
 357                 return memcmp(sum, file->u.sum, protocol_version < 21 ? 2
 358                                                         : MD4_SUM_LENGTH) == 0;
 359         }
 360
 361         if (size_only)
 362                 return 1;
 363
 364         if (ignore_times)
 365                 return 0;
 366
 367         return cmp_modtime(st->st_mtime, file->modtime) == 0;
 368 }
 369
 370
 371 /*
 372  * set (initialize) the size entries in the per-file sum_struct
 373  * calculating dynamic block and checksum sizes.
 374  *
 375  * This is only called from generate_and_send_sums() but is a separate
 376  * function to encapsulate the logic.
 377  *
 378  * The block size is a rounded square root of file length.
 379  *
 380  * The checksum size is determined according to:
 381  *     blocksum_bits = BLOCKSUM_EXP + 2*log2(file_len) - log2(block_len)
 382  * provided by Donovan Baarda which gives a probability of rsync
 383  * algorithm corrupting data and falling back using the whole md4
 384  * checksums.
 385  *
 386  * This might be made one of several selectable heuristics.
 387  */
 388 static void sum_sizes_sqroot(struct sum_struct *sum, int64 len)
 389 {
 390         int32 blength;
 391         int s2length;
 392
 393         if (block_size)
 394                 blength = block_size;
 395         else if (len <= BLOCK_SIZE * BLOCK_SIZE)
 396                 blength = BLOCK_SIZE;
 397         else {
 398                 int32 c;
 399                 int64 l;
 400                 int cnt;
 401                 for (c = 1, l = len, cnt = 0; l >>= 2; c <<= 1, cnt++) {}
 402                 if (cnt >= 31 || c >= MAX_BLOCK_SIZE)
 403                         blength = MAX_BLOCK_SIZE;
 404                 else {
 405                     blength = 0;
 406                     do {
 407                             blength |= c;
 408                             if (len < (int64)blength * blength)
 409                                     blength &= ~c;
 410                             c >>= 1;
 411                     } while (c >= 8);   /* round to multiple of 8 */
 412                     blength = MAX(blength, BLOCK_SIZE);
 413                 }
 414         }
 415
 416         if (protocol_version < 27) {
 417                 s2length = csum_length;
 418         } else if (csum_length == SUM_LENGTH) {
 419                 s2length = SUM_LENGTH;
 420         } else {
 421                 int32 c;
 422                 int64 l;
 423                 int b = BLOCKSUM_BIAS;
 424                 for (l = len; l >>= 1; b += 2) {}
 425                 for (c = blength; c >>= 1 && b; b--) {}
 426                 /* add a bit, subtract rollsum, round up. */
 427                 s2length = (b + 1 - 32 + 7) / 8; /* --optimize in compiler-- */
 428                 s2length = MAX(s2length, csum_length);
 429                 s2length = MIN(s2length, SUM_LENGTH);
 430         }
 431
 432         sum->flength    = len;
 433         sum->blength    = blength;
 434         sum->s2length   = s2length;
 435         sum->count      = (len + (blength - 1)) / blength;
 436         sum->remainder  = (len % blength);
 437
 438         if (sum->count && verbose > 2) {
 439                 rprintf(FINFO,
 440                         "count=%.0f rem=%ld blength=%ld s2length=%d flength=%.0f\n",
 441                         (double)sum->count, (long)sum->remainder, (long)sum->blength,
 442                         sum->s2length, (double)sum->flength);
 443         }
 444 }
 445
 446
 447 /*
 448  * Generate and send a stream of signatures/checksums that describe a buffer
 449  *
 450  * Generate approximately one checksum every block_len bytes.
 451  */
 452 static void generate_and_send_sums(int fd, OFF_T len, int f_out, int f_copy)
 453 {
 454         int32 i;
 455         struct map_struct *mapbuf;
 456         struct sum_struct sum;
 457         OFF_T offset = 0;
 458
 459         sum_sizes_sqroot(&sum, len);
 460
 461         if (len > 0)
 462                 mapbuf = map_file(fd, len, MAX_MAP_SIZE, sum.blength);
 463         else
 464                 mapbuf = NULL;
 465
 466         write_sum_head(f_out, &sum);
 467
 468         for (i = 0; i < sum.count; i++) {
 469                 int32 n1 = (int32)MIN(len, (OFF_T)sum.blength);
 470                 char *map = map_ptr(mapbuf, offset, n1);
 471                 uint32 sum1 = get_checksum1(map, n1);
 472                 char sum2[SUM_LENGTH];
 473
 474                 if (f_copy >= 0)
 475                         full_write(f_copy, map, n1);
 476
 477                 get_checksum2(map, n1, sum2);
 478
 479                 if (verbose > 3) {
 480                         rprintf(FINFO,
 481                                 "chunk[%.0f] offset=%.0f len=%ld sum1=%08lx\n",
 482                                 (double)i, (double)offset, (long)n1,
 483                                 (unsigned long)sum1);
 484                 }
 485                 write_int(f_out, sum1);
 486                 write_buf(f_out, sum2, sum.s2length);
 487                 len -= n1;
 488                 offset += n1;
 489         }
 490
 491         if (mapbuf)
 492                 unmap_file(mapbuf);
 493 }
 494
 495
 496 /* Try to find a filename in the same dir as "fname" with a similar name. */
 497 static int find_fuzzy(struct file_struct *file, struct file_list *dirlist)
 498 {
 499         int fname_len, fname_suf_len;
 500         const char *fname_suf, *fname = file->basename;
 501         uint32 lowest_dist = 0x7FFFFFFF;
 502         int j, lowest_j = -1;
 503
 504         fname_len = strlen(fname);
 505         fname_suf = find_filename_suffix(fname, fname_len, &fname_suf_len);
 506
 507         for (j = 0; j < dirlist->count; j++) {
 508                 struct file_struct *fp = dirlist->files[j];
 509                 const char *suf, *name;
 510                 int len, suf_len;
 511                 uint32 dist;
 512
 513                 if (!S_ISREG(fp->mode) || !fp->length
 514                     || fp->flags & FLAG_NO_FUZZY)
 515                         continue;
 516
 517                 name = fp->basename;
 518
 519                 if (fp->length == file->length
 520                     && fp->modtime == file->modtime) {
 521                         if (verbose > 4) {
 522                                 rprintf(FINFO,
 523                                         "fuzzy size/modtime match for %s\n",
 524                                         name);
 525                         }
 526                         return j;
 527                 }
 528
 529                 len = strlen(name);
 530                 suf = find_filename_suffix(name, len, &suf_len);
 531
 532                 dist = fuzzy_distance(name, len, fname, fname_len);
 533                 /* Add some extra weight to how well the suffixes match. */
 534                 dist += fuzzy_distance(suf, suf_len, fname_suf, fname_suf_len)
 535                       * 10;
 536                 if (verbose > 4) {
 537                         rprintf(FINFO, "fuzzy distance for %s = %d.%05d\n",
 538                                 name, (int)(dist>>16), (int)(dist&0xFFFF));
 539                 }
 540                 if (dist <= lowest_dist) {
 541                         lowest_dist = dist;
 542                         lowest_j = j;
 543                 }
 544         }
 545
 546         return lowest_j;
 547 }
 548
 549
 550 /* Acts on flist->file's ndx'th item, whose name is fname.  If a directory,
 551  * make sure it exists, and has the right permissions/timestamp info.  For
 552  * all other non-regular files (symlinks, etc.) we create them here.  For
 553  * regular files that have changed, we try to find a basis file and then
 554  * start sending checksums.
 555  *
 556  * Note that f_out is set to -1 when doing final directory-permission and
 557  * modification-time repair. */
 558 static void recv_generator(char *fname, struct file_list *flist,
 559                            struct file_struct *file, int ndx,
 560                            int itemizing, int maybe_PERMS_REPORT,
 561                            enum logcode code, int allowed_lull,
 562                            int f_out, int f_out_name)
 563 {
 564         static int missing_below = -1, excluded_below = -1;
 565         static char *fuzzy_dirname = NULL;
 566         static struct file_list *fuzzy_dirlist = NULL;
 567         struct file_struct *fuzzy_file = NULL;
 568         int fd = -1, f_copy = -1;
 569         STRUCT_STAT st, partial_st;
 570         struct file_struct *back_file = NULL;
 571         int statret, stat_errno;
 572         char *fnamecmp, *partialptr, *backupptr = NULL;
 573         char fnamecmpbuf[MAXPATHLEN];
 574         uchar fnamecmp_type;
 575
 576         if (list_only)
 577                 return;
 578
 579         if (!fname) {
 580                 if (fuzzy_dirlist) {
 581                         flist_free(fuzzy_dirlist);
 582                         fuzzy_dirlist = NULL;
 583                         fuzzy_dirname = NULL;
 584                 }
 585                 if (missing_below >= 0) {
 586                         dry_run--;
 587                         missing_below = -1;
 588                 }
 589                 return;
 590         }
 591
 592         if (verbose > 2) {
 593                 rprintf(FINFO, "recv_generator(%s,%d)\n",
 594                         safe_fname(fname), ndx);
 595         }
 596
 597         if (server_filter_list.head) {
 598                 if (excluded_below >= 0) {
 599                         if (file->dir.depth > excluded_below)
 600                                 goto skipping;
 601                         excluded_below = -1;
 602                 }
 603                 if (check_filter(&server_filter_list, fname,
 604                                  S_ISDIR(file->mode)) < 0) {
 605                         if (S_ISDIR(file->mode))
 606                                 excluded_below = file->dir.depth;
 607                     skipping:
 608                         if (verbose) {
 609                                 rprintf(FINFO,
 610                                         "skipping server-excluded file \"%s\"\n",
 611                                         safe_fname(fname));
 612                         }
 613                         return;
 614                 }
 615         }
 616
 617         if (missing_below >= 0 && file->dir.depth <= missing_below) {
 618                 dry_run--;
 619                 missing_below = -1;
 620         }
 621         if (dry_run > 1) {
 622                 statret = -1;
 623                 stat_errno = ENOENT;
 624         } else {
 625                 if (fuzzy_basis && S_ISREG(file->mode)) {
 626                         char *dn = file->dirname ? file->dirname : ".";
 627                         /* Yes, identical dirnames are guaranteed to have
 628                          * identical pointers at this point. */
 629                         if (fuzzy_dirname != dn) {
 630                                 if (fuzzy_dirlist)
 631                                         flist_free(fuzzy_dirlist);
 632                                 fuzzy_dirname = dn;
 633                                 fuzzy_dirlist = get_dirlist(fuzzy_dirname, -1,
 634                                                             1);
 635                         }
 636                 }
 637
 638                 statret = link_stat(fname, &st,
 639                                     keep_dirlinks && S_ISDIR(file->mode));
 640                 stat_errno = errno;
 641         }
 642
 643         if (only_existing && statret == -1 && stat_errno == ENOENT) {
 644                 /* we only want to update existing files */
 645                 if (verbose > 1) {
 646                         rprintf(FINFO, "not creating new file \"%s\"\n",
 647                                 safe_fname(fname));
 648                 }
 649                 return;
 650         }
 651
 652         if (statret == 0 && !preserve_perms
 653             && S_ISDIR(st.st_mode) == S_ISDIR(file->mode)) {
 654                 /* if the file exists already and we aren't perserving
 655                  * permissions then act as though the remote end sent
 656                  * us the file permissions we already have */
 657                 file->mode = (file->mode & ~CHMOD_BITS)
 658                            | (st.st_mode & CHMOD_BITS);
 659         }
 660
 661         if (S_ISDIR(file->mode)) {
 662                 /* The file to be received is a directory, so we need
 663                  * to prepare appropriately.  If there is already a
 664                  * file of that name and it is *not* a directory, then
 665                  * we need to delete it.  If it doesn't exist, then
 666                  * (perhaps recursively) create it. */
 667                 if (statret == 0 && !S_ISDIR(st.st_mode)) {
 668                         delete_item(fname, st.st_mode, DEL_TERSE);
 669                         statret = -1;
 670                 }
 671                 if (dry_run && statret != 0 && missing_below < 0) {
 672                         missing_below = file->dir.depth;
 673                         dry_run++;
 674                 }
 675                 if (itemizing && f_out != -1)
 676                         itemize(file, statret, &st, 0, f_out, ndx);
 677                 if (statret != 0 && do_mkdir(fname,file->mode) != 0 && errno != EEXIST) {
 678                         if (!relative_paths || errno != ENOENT
 679                             || create_directory_path(fname, orig_umask) < 0
 680                             || do_mkdir(fname, file->mode) < 0) {
 681                                 rsyserr(FERROR, errno,
 682                                         "recv_generator: mkdir %s failed",
 683                                         full_fname(fname));
 684                         }
 685                 }
 686                 if (set_perms(fname, file, statret ? NULL : &st, 0)
 687                     && verbose && code && f_out != -1)
 688                         rprintf(code, "%s/\n", safe_fname(fname));
 689                 if (delete_during && f_out != -1 && csum_length != SUM_LENGTH
 690                     && (file->flags & FLAG_DEL_HERE))
 691                         delete_in_dir(flist, fname, file, allowed_lull);
 692                 return;
 693         }
 694
 695         if (max_size && file->length > max_size) {
 696                 if (verbose > 1) {
 697                         rprintf(FINFO, "%s is over max-size\n",
 698                                 safe_fname(fname));
 699                 }
 700                 return;
 701         }
 702
 703         if (preserve_links && S_ISLNK(file->mode)) {
 704 #ifdef SUPPORT_LINKS
 705                 if (safe_symlinks && unsafe_symlink(file->u.link, fname)) {
 706                         if (verbose) {
 707                                 rprintf(FINFO,
 708                                         "ignoring unsafe symlink %s -> \"%s\"\n",
 709                                         full_fname(fname),
 710                                         safe_fname(file->u.link));
 711                         }
 712                         return;
 713                 }
 714                 if (statret == 0) {
 715                         char lnk[MAXPATHLEN];
 716                         int len;
 717
 718                         if (!S_ISDIR(st.st_mode)
 719                             && (len = readlink(fname, lnk, MAXPATHLEN-1)) > 0) {
 720                                 lnk[len] = 0;
 721                                 /* A link already pointing to the
 722                                  * right place -- no further action
 723                                  * required. */
 724                                 if (strcmp(lnk, file->u.link) == 0) {
 725                                         if (itemizing) {
 726                                                 itemize(file, 0, &st, 0,
 727                                                         f_out, ndx);
 728                                         }
 729                                         set_perms(fname, file, &st,
 730                                                   maybe_PERMS_REPORT);
 731                                         return;
 732                                 }
 733                         }
 734                         /* Not the right symlink (or not a symlink), so
 735                          * delete it. */
 736                         if (S_ISLNK(st.st_mode))
 737                                 delete_item(fname, st.st_mode, DEL_TERSE);
 738                         else {
 739                                 delete_item(fname, st.st_mode, DEL_TERSE);
 740                                 statret = -1;
 741                         }
 742                 }
 743                 if (do_symlink(file->u.link,fname) != 0) {
 744                         rsyserr(FERROR, errno, "symlink %s -> \"%s\" failed",
 745                                 full_fname(fname), safe_fname(file->u.link));
 746                 } else {
 747                         set_perms(fname,file,NULL,0);
 748                         if (itemizing) {
 749                                 itemize(file, statret, &st, SID_UPDATING,
 750                                         f_out, ndx);
 751                         }
 752                         if (code && verbose) {
 753                                 rprintf(code, "%s -> %s\n", safe_fname(fname),
 754                                         safe_fname(file->u.link));
 755                         }
 756                         if (remove_sent_files && !dry_run) {
 757                                 char numbuf[4];
 758                                 SIVAL(numbuf, 0, ndx);
 759                                 send_msg(MSG_SUCCESS, numbuf, 4);
 760                         }
 761                 }
 762 #endif
 763                 return;
 764         }
 765
 766         if (am_root && preserve_devices && IS_DEVICE(file->mode)) {
 767                 if (statret != 0 ||
 768                     st.st_mode != file->mode ||
 769                     st.st_rdev != file->u.rdev) {
 770                         delete_item(fname, st.st_mode, DEL_TERSE);
 771                         if (!IS_DEVICE(st.st_mode))
 772                                 statret = -1;
 773                         if (verbose > 2) {
 774                                 rprintf(FINFO,"mknod(%s,0%o,0x%x)\n",
 775                                         safe_fname(fname),
 776                                         (int)file->mode, (int)file->u.rdev);
 777                         }
 778                         if (do_mknod(fname,file->mode,file->u.rdev) != 0) {
 779                                 rsyserr(FERROR, errno, "mknod %s failed",
 780                                         full_fname(fname));
 781                         } else {
 782                                 set_perms(fname,file,NULL,0);
 783                                 if (itemizing) {
 784                                         itemize(file, statret, &st, SID_UPDATING,
 785                                                 f_out, ndx);
 786                                 }
 787                                 if (code && verbose) {
 788                                         rprintf(code, "%s\n",
 789                                                 safe_fname(fname));
 790                                 }
 791                         }
 792                 } else {
 793                         if (itemizing) {
 794                                 itemize(file, statret, &st, 0,
 795                                         f_out, ndx);
 796                         }
 797                         set_perms(fname, file, &st, maybe_PERMS_REPORT);
 798                 }
 799                 return;
 800         }
 801
 802         if (preserve_hard_links && hard_link_check(file, HL_CHECK_MASTER))
 803                 return;
 804
 805         if (!S_ISREG(file->mode)) {
 806                 rprintf(FINFO, "skipping non-regular file \"%s\"\n",
 807                         safe_fname(fname));
 808                 return;
 809         }
 810
 811         fnamecmp = fname;
 812         fnamecmp_type = FNAMECMP_FNAME;
 813
 814         if (statret != 0 && basis_dir[0] != NULL) {
 815                 int fallback_match = -1;
 816                 int match_level = 0;
 817                 int i = 0;
 818                 do {
 819                         pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 820                                  basis_dir[i], fname);
 821                         if (link_stat(fnamecmpbuf, &st, 0) == 0
 822                             && S_ISREG(st.st_mode)) {
 823                                 statret = 0;
 824                                 if (link_dest) {
 825                                         if (!match_level) {
 826                                                 fallback_match = i;
 827                                                 match_level = 1;
 828                                         } else if (match_level == 2
 829                                             && !unchanged_attrs(file, &st))
 830                                                 continue;
 831                                         if (!unchanged_file(fnamecmpbuf, file, &st))
 832                                                 continue;
 833                                         fallback_match = i;
 834                                         match_level = 2;
 835                                         if (!unchanged_attrs(file, &st))
 836                                                 continue;
 837                                 }
 838                                 match_level = 3;
 839                                 break;
 840                         }
 841                 } while (basis_dir[++i] != NULL);
 842                 if (statret == 0) {
 843                         if (match_level < 3) {
 844                                 i = fallback_match;
 845                                 pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 846                                          basis_dir[i], fname);
 847                         }
 848 #ifdef HAVE_LINK
 849                         if (link_dest && match_level == 3 && !dry_run) {
 850                                 if (do_link(fnamecmpbuf, fname) < 0) {
 851                                         if (verbose) {
 852                                                 rsyserr(FINFO, errno,
 853                                                         "link %s => %s",
 854                                                         full_fname(fnamecmpbuf),
 855                                                         safe_fname(fname));
 856                                         }
 857                                         fnamecmp = fnamecmpbuf;
 858                                         fnamecmp_type = i;
 859                                 }
 860                         } else
 861 #endif
 862                         {
 863                                 fnamecmp = fnamecmpbuf;
 864                                 fnamecmp_type = i;
 865                         }
 866                 }
 867         }
 868
 869         if (statret == 0 && !S_ISREG(st.st_mode)) {
 870                 if (delete_item(fname, st.st_mode, DEL_TERSE) != 0)
 871                         return;
 872                 statret = -1;
 873                 stat_errno = ENOENT;
 874         }
 875
 876         if (partial_dir && (partialptr = partial_dir_fname(fname)) != NULL
 877             && link_stat(partialptr, &partial_st, 0) == 0
 878             && S_ISREG(partial_st.st_mode)) {
 879                 if (statret != 0)
 880                         goto prepare_to_open;
 881         } else
 882                 partialptr = NULL;
 883
 884         if (statret != 0 && fuzzy_basis && dry_run <= 1) {
 885                 int j = find_fuzzy(file, fuzzy_dirlist);
 886                 if (j >= 0) {
 887                         fuzzy_file = fuzzy_dirlist->files[j];
 888                         f_name_to(fuzzy_file, fnamecmpbuf);
 889                         if (verbose > 2) {
 890                                 rprintf(FINFO, "fuzzy basis selected for %s: %s\n",
 891                                         safe_fname(fname), safe_fname(fnamecmpbuf));
 892                         }
 893                         st.st_mode = fuzzy_file->mode;
 894                         st.st_size = fuzzy_file->length;
 895                         st.st_mtime = fuzzy_file->modtime;
 896                         statret = 0;
 897                         fnamecmp = fnamecmpbuf;
 898                         fnamecmp_type = FNAMECMP_FUZZY;
 899                 }
 900         }
 901
 902         if (statret != 0) {
 903                 if (preserve_hard_links && hard_link_check(file, HL_SKIP))
 904                         return;
 905                 if (stat_errno == ENOENT)
 906                         goto notify_others;
 907                 if (verbose > 1) {
 908                         rsyserr(FERROR, stat_errno,
 909                                 "recv_generator: failed to stat %s",
 910                                 full_fname(fname));
 911                 }
 912                 return;
 913         }
 914
 915         if (opt_ignore_existing && fnamecmp_type == FNAMECMP_FNAME) {
 916                 if (verbose > 1)
 917                         rprintf(FINFO, "%s exists\n", safe_fname(fname));
 918                 return;
 919         }
 920
 921         if (update_only && fnamecmp_type == FNAMECMP_FNAME
 922             && cmp_modtime(st.st_mtime, file->modtime) > 0) {
 923                 if (verbose > 1)
 924                         rprintf(FINFO, "%s is newer\n", safe_fname(fname));
 925                 return;
 926         }
 927
 928         if (!compare_dest && fnamecmp_type <= FNAMECMP_BASIS_DIR_HIGH)
 929                 ;
 930         else if (fnamecmp_type == FNAMECMP_FUZZY)
 931                 ;
 932         else if (unchanged_file(fnamecmp, file, &st)) {
 933                 if (itemizing) {
 934                         itemize(file, statret, &st,
 935                                 fnamecmp_type == FNAMECMP_FNAME
 936                                                ? 0 : SID_NO_DEST_AND_NO_UPDATE,
 937                                 f_out, ndx);
 938                 }
 939                 if (fnamecmp_type == FNAMECMP_FNAME)
 940                         set_perms(fname, file, &st, maybe_PERMS_REPORT);
 941                 return;
 942         }
 943
 944 prepare_to_open:
 945         if (partialptr) {
 946                 st = partial_st;
 947                 fnamecmp = partialptr;
 948                 fnamecmp_type = FNAMECMP_PARTIAL_DIR;
 949                 statret = 0;
 950         }
 951
 952         if (dry_run || read_batch)
 953                 goto notify_others;
 954         if (whole_file > 0) {
 955                 if (statret == 0)
 956                         statret = 1;
 957                 goto notify_others;
 958         }
 959
 960         if (fuzzy_basis) {
 961                 int j = flist_find(fuzzy_dirlist, file);
 962                 if (j >= 0) /* don't use changing file as future fuzzy basis */
 963                         fuzzy_dirlist->files[j]->flags |= FLAG_NO_FUZZY;
 964         }
 965
 966         /* open the file */
 967         fd = do_open(fnamecmp, O_RDONLY, 0);
 968
 969         if (fd == -1) {
 970                 rsyserr(FERROR, errno, "failed to open %s, continuing",
 971                         full_fname(fnamecmp));
 972             pretend_missing:
 973                 /* pretend the file didn't exist */
 974                 if (preserve_hard_links && hard_link_check(file, HL_SKIP))
 975                         return;
 976                 statret = -1;
 977                 goto notify_others;
 978         }
 979
 980         if (inplace && make_backups) {
 981                 if (!(backupptr = get_backup_name(fname))) {
 982                         close(fd);
 983                         return;
 984                 }
 985                 if (!(back_file = make_file(fname, NULL, NO_FILTERS))) {
 986                         close(fd);
 987                         goto pretend_missing;
 988                 }
 989                 if (robust_unlink(backupptr) && errno != ENOENT) {
 990                         rsyserr(FERROR, errno, "unlink %s",
 991                                 full_fname(backupptr));
 992                         free(back_file);
 993                         close(fd);
 994                         return;
 995                 }
 996                 if ((f_copy = do_open(backupptr,
 997                     O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0600)) < 0) {
 998                         rsyserr(FERROR, errno, "open %s",
 999                                 full_fname(backupptr));
1000                         free(back_file);
1001                         close(fd);
1002                         return;
1003                 }
1004                 fnamecmp_type = FNAMECMP_BACKUP;
1005         }
1006
1007         if (verbose > 3) {
1008                 rprintf(FINFO, "gen mapped %s of size %.0f\n",
1009                         safe_fname(fnamecmp), (double)st.st_size);
1010         }
1011
1012         if (verbose > 2)
1013                 rprintf(FINFO, "generating and sending sums for %d\n", ndx);
1014
1015 notify_others:
1016         write_int(f_out, ndx);
1017         if (itemizing) {
1018                 int iflags = SID_UPDATING;
1019                 if (always_checksum)
1020                         iflags |= SID_REPORT_CHECKSUM;
1021                 if (fnamecmp_type != FNAMECMP_FNAME)
1022                         iflags |= SID_USING_ALT_BASIS;
1023                 itemize(file, statret, &st, iflags, f_out, -1);
1024         }
1025         if (f_out_name >= 0) {
1026                 write_byte(f_out_name, fnamecmp_type);
1027                 if (fnamecmp_type == FNAMECMP_FUZZY) {
1028                         uchar lenbuf[3], *lb = lenbuf;
1029                         int len = strlen(fuzzy_file->basename);
1030                         if (len > 0x7F) {
1031 #if MAXPATHLEN > 0x7FFF
1032                                 *lb++ = len / 0x10000 + 0x80;
1033                                 *lb++ = len / 0x100;
1034 #else
1035                                 *lb++ = len / 0x100 + 0x80;
1036 #endif
1037                         }
1038                         *lb = len;
1039                         write_buf(f_out_name, (char*)lenbuf, lb - lenbuf + 1);
1040                         write_buf(f_out_name, fuzzy_file->basename, len);
1041                 }
1042         }
1043
1044         if (dry_run || read_batch)
1045                 return;
1046
1047         if (statret == 0) {
1048                 generate_and_send_sums(fd, st.st_size, f_out, f_copy);
1049
1050                 if (f_copy >= 0) {
1051                         close(f_copy);
1052                         set_perms(backupptr, back_file, NULL, 0);
1053                         if (verbose > 1) {
1054                                 rprintf(FINFO, "backed up %s to %s\n",
1055                                         safe_fname(fname), safe_fname(backupptr));
1056                         }
1057                         free(back_file);
1058                 }
1059
1060                 close(fd);
1061         } else
1062                 write_sum_head(f_out, NULL);
1063 }
1064
1065
1066 void generate_files(int f_out, struct file_list *flist, char *local_name,
1067                     int f_out_name)
1068 {
1069         int i;
1070         int phase = 0;
1071         char fbuf[MAXPATHLEN];
1072         int itemizing, maybe_PERMS_REPORT;
1073         enum logcode code;
1074         int need_retouch_dir_times = preserve_times && !omit_dir_times;
1075         int need_retouch_dir_perms = 0;
1076         int save_only_existing = only_existing;
1077         int save_opt_ignore_existing = opt_ignore_existing;
1078         int allowed_lull = read_batch ? 0 : (io_timeout + 1) / 2;
1079         int lull_mod = allowed_lull * 5;
1080
1081         if (protocol_version >= 29) {
1082                 itemizing = 1;
1083                 maybe_PERMS_REPORT = log_format_has_i ? 0 : PERMS_REPORT;
1084                 code = daemon_log_format_has_i ? 0 : FLOG;
1085         } else if (am_daemon) {
1086                 itemizing = daemon_log_format_has_i && !dry_run;
1087                 maybe_PERMS_REPORT = PERMS_REPORT;
1088                 code = itemizing || dry_run ? FCLIENT : FINFO;
1089         } else if (!am_server) {
1090                 itemizing = log_format_has_i;
1091                 maybe_PERMS_REPORT = log_format_has_i ? 0 : PERMS_REPORT;
1092                 code = itemizing ? 0 : FINFO;
1093         } else {
1094                 itemizing = 0;
1095                 maybe_PERMS_REPORT = PERMS_REPORT;
1096                 code = FINFO;
1097         }
1098
1099         if (verbose > 2) {
1100                 rprintf(FINFO, "generator starting pid=%ld count=%d\n",
1101                         (long)getpid(), flist->count);
1102         }
1103
1104         if (delete_before && !local_name && flist->count > 0)
1105                 do_delete_pass(flist, allowed_lull);
1106
1107         if (verbose >= 2) {
1108                 rprintf(FINFO, "delta-transmission %s\n",
1109                         whole_file > 0
1110                         ? "disabled for local transfer or --whole-file"
1111                         : "enabled");
1112         }
1113
1114         if (protocol_version < 29)
1115                 ignore_timeout = 1;
1116
1117         for (i = 0; i < flist->count; i++) {
1118                 struct file_struct *file = flist->files[i];
1119                 struct file_struct copy;
1120
1121                 if (!file->basename)
1122                         continue;
1123
1124                 /* We need to ensure that any dirs we create have writeable
1125                  * permissions during the time we are putting files within
1126                  * them.  This is then fixed after the transfer is done. */
1127                 if (!am_root && S_ISDIR(file->mode) && !(file->mode & S_IWUSR)) {
1128                         copy = *file;
1129                         copy.mode |= S_IWUSR; /* user write */
1130                         file = &copy;
1131                         need_retouch_dir_perms = 1;
1132                 }
1133
1134                 recv_generator(local_name ? local_name : f_name_to(file, fbuf),
1135                                flist, file, i, itemizing, maybe_PERMS_REPORT,
1136                                code, allowed_lull, f_out, f_out_name);
1137
1138                 if (allowed_lull && !(i % lull_mod))
1139                         maybe_send_keepalive(allowed_lull, flist->count);
1140         }
1141         recv_generator(NULL, NULL, NULL, 0, 0, 0, code, 0, -1, -1);
1142         if (delete_during)
1143                 delete_in_dir(NULL, NULL, NULL, 0);
1144
1145         phase++;
1146         csum_length = SUM_LENGTH;
1147         only_existing = max_size = opt_ignore_existing = 0;
1148         update_only = always_checksum = size_only = 0;
1149         ignore_times = 1;
1150         make_backups = 0; /* avoid a duplicate backup for inplace processing */
1151
1152         /* We expect to just sit around now, so don't exit on a timeout.
1153          * If we really get a timeout then the other process should exit. */
1154         ignore_timeout = 1;
1155
1156         if (verbose > 2)
1157                 rprintf(FINFO,"generate_files phase=%d\n",phase);
1158
1159         write_int(f_out, -1);
1160
1161         /* files can cycle through the system more than once
1162          * to catch initial checksum errors */
1163         while ((i = get_redo_num()) != -1) {
1164                 struct file_struct *file = flist->files[i];
1165                 recv_generator(local_name ? local_name : f_name_to(file, fbuf),
1166                                flist, file, i, itemizing, maybe_PERMS_REPORT,
1167                                code, allowed_lull, f_out, f_out_name);
1168         }
1169
1170         phase++;
1171         only_existing = save_only_existing;
1172         opt_ignore_existing = save_opt_ignore_existing;
1173
1174         if (verbose > 2)
1175                 rprintf(FINFO,"generate_files phase=%d\n",phase);
1176
1177         write_int(f_out, -1);
1178
1179         /* Read post-redo-phase MSG_DONE and any prior messages. */
1180         get_redo_num();
1181
1182         if (preserve_hard_links)
1183                 do_hard_links(allowed_lull, flist->count);
1184
1185         if (delete_after && !local_name && flist->count > 0)
1186                 do_delete_pass(flist, allowed_lull);
1187
1188         if ((need_retouch_dir_perms || need_retouch_dir_times)
1189             && !list_only && !local_name && !dry_run) {
1190                 int j = 0;
1191                 /* Now we need to fix any directory permissions that were
1192                  * modified during the transfer and/or re-set any tweaked
1193                  * modified-time values. */
1194                 for (i = 0; i < flist->count; i++) {
1195                         struct file_struct *file = flist->files[i];
1196                         if (!file->basename || !S_ISDIR(file->mode))
1197                                 continue;
1198                         if (!need_retouch_dir_times && file->mode & S_IWUSR)
1199                                 continue;
1200                         recv_generator(local_name ? local_name : f_name(file),
1201                                        flist, file, i, itemizing,
1202                                        maybe_PERMS_REPORT, code, allowed_lull,
1203                                        -1, -1);
1204                         if (allowed_lull && !(j++ % lull_mod))
1205                                 maybe_send_keepalive(allowed_lull, flist->count);
1206                 }
1207         }
1208         recv_generator(NULL, NULL, NULL, 0, 0, 0, code, 0, -1, -1);
1209
1210         if (verbose > 2)
1211                 rprintf(FINFO,"generate_files finished\n");
1212 }