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; /* mark subdir dels as not "in the way" */
 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 static void itemize(struct file_struct *file, int statret, STRUCT_STAT *st,
 303                     int32 iflags, int f_out, int ndx)
 304 {
 305         if (statret >= 0) {
 306                 if (S_ISREG(file->mode) && file->length != st->st_size)
 307                         iflags |= ITEM_REPORT_SIZE;
 308                 if (!(iflags & ITEM_NO_DEST_AND_NO_UPDATE)) {
 309                         int keep_time = !preserve_times ? 0
 310                             : S_ISDIR(file->mode) ? !omit_dir_times
 311                             : !S_ISLNK(file->mode);
 312
 313                         if ((iflags & ITEM_UPDATING && !keep_time)
 314                             || (keep_time && file->modtime != st->st_mtime))
 315                                 iflags |= ITEM_REPORT_TIME;
 316                         if (preserve_perms && file->mode != st->st_mode)
 317                                 iflags |= ITEM_REPORT_PERMS;
 318                         if (preserve_uid && am_root && file->uid != st->st_uid)
 319                                 iflags |= ITEM_REPORT_OWNER;
 320                         if (preserve_gid && file->gid != GID_NONE
 321                             && st->st_gid != file->gid)
 322                                 iflags |= ITEM_REPORT_GROUP;
 323                 }
 324         } else
 325                 iflags |= ITEM_IS_NEW | ITEM_UPDATING;
 326
 327         iflags &= 0xffff;
 328         if ((iflags || verbose > 1) && !read_batch) {
 329                 if (protocol_version >= 29) {
 330                         if (ndx >= 0)
 331                                 write_int(f_out, ndx);
 332                         write_shortint(f_out, iflags);
 333                 } else if (ndx >= 0)
 334                         log_recv(file, &stats, iflags);
 335         }
 336 }
 337
 338
 339 /* Perform our quick-check heuristic for determining if a file is unchanged. */
 340 static int unchanged_file(char *fn, struct file_struct *file, STRUCT_STAT *st)
 341 {
 342         if (st->st_size != file->length)
 343                 return 0;
 344
 345         /* if always checksum is set then we use the checksum instead
 346            of the file time to determine whether to sync */
 347         if (always_checksum && S_ISREG(st->st_mode)) {
 348                 char sum[MD4_SUM_LENGTH];
 349                 file_checksum(fn, sum, st->st_size);
 350                 return memcmp(sum, file->u.sum, protocol_version < 21 ? 2
 351                                                         : MD4_SUM_LENGTH) == 0;
 352         }
 353
 354         if (size_only)
 355                 return 1;
 356
 357         if (ignore_times)
 358                 return 0;
 359
 360         return cmp_modtime(st->st_mtime, file->modtime) == 0;
 361 }
 362
 363
 364 /*
 365  * set (initialize) the size entries in the per-file sum_struct
 366  * calculating dynamic block and checksum sizes.
 367  *
 368  * This is only called from generate_and_send_sums() but is a separate
 369  * function to encapsulate the logic.
 370  *
 371  * The block size is a rounded square root of file length.
 372  *
 373  * The checksum size is determined according to:
 374  *     blocksum_bits = BLOCKSUM_EXP + 2*log2(file_len) - log2(block_len)
 375  * provided by Donovan Baarda which gives a probability of rsync
 376  * algorithm corrupting data and falling back using the whole md4
 377  * checksums.
 378  *
 379  * This might be made one of several selectable heuristics.
 380  */
 381 static void sum_sizes_sqroot(struct sum_struct *sum, int64 len)
 382 {
 383         int32 blength;
 384         int s2length;
 385
 386         if (block_size)
 387                 blength = block_size;
 388         else if (len <= BLOCK_SIZE * BLOCK_SIZE)
 389                 blength = BLOCK_SIZE;
 390         else {
 391                 int32 c;
 392                 int64 l;
 393                 int cnt;
 394                 for (c = 1, l = len, cnt = 0; l >>= 2; c <<= 1, cnt++) {}
 395                 if (cnt >= 31 || c >= MAX_BLOCK_SIZE)
 396                         blength = MAX_BLOCK_SIZE;
 397                 else {
 398                     blength = 0;
 399                     do {
 400                             blength |= c;
 401                             if (len < (int64)blength * blength)
 402                                     blength &= ~c;
 403                             c >>= 1;
 404                     } while (c >= 8);   /* round to multiple of 8 */
 405                     blength = MAX(blength, BLOCK_SIZE);
 406                 }
 407         }
 408
 409         if (protocol_version < 27) {
 410                 s2length = csum_length;
 411         } else if (csum_length == SUM_LENGTH) {
 412                 s2length = SUM_LENGTH;
 413         } else {
 414                 int32 c;
 415                 int64 l;
 416                 int b = BLOCKSUM_BIAS;
 417                 for (l = len; l >>= 1; b += 2) {}
 418                 for (c = blength; c >>= 1 && b; b--) {}
 419                 /* add a bit, subtract rollsum, round up. */
 420                 s2length = (b + 1 - 32 + 7) / 8; /* --optimize in compiler-- */
 421                 s2length = MAX(s2length, csum_length);
 422                 s2length = MIN(s2length, SUM_LENGTH);
 423         }
 424
 425         sum->flength    = len;
 426         sum->blength    = blength;
 427         sum->s2length   = s2length;
 428         sum->count      = (len + (blength - 1)) / blength;
 429         sum->remainder  = (len % blength);
 430
 431         if (sum->count && verbose > 2) {
 432                 rprintf(FINFO,
 433                         "count=%.0f rem=%ld blength=%ld s2length=%d flength=%.0f\n",
 434                         (double)sum->count, (long)sum->remainder, (long)sum->blength,
 435                         sum->s2length, (double)sum->flength);
 436         }
 437 }
 438
 439
 440 /*
 441  * Generate and send a stream of signatures/checksums that describe a buffer
 442  *
 443  * Generate approximately one checksum every block_len bytes.
 444  */
 445 static void generate_and_send_sums(int fd, OFF_T len, int f_out, int f_copy)
 446 {
 447         int32 i;
 448         struct map_struct *mapbuf;
 449         struct sum_struct sum;
 450         OFF_T offset = 0;
 451
 452         sum_sizes_sqroot(&sum, len);
 453
 454         if (len > 0)
 455                 mapbuf = map_file(fd, len, MAX_MAP_SIZE, sum.blength);
 456         else
 457                 mapbuf = NULL;
 458
 459         write_sum_head(f_out, &sum);
 460
 461         for (i = 0; i < sum.count; i++) {
 462                 int32 n1 = (int32)MIN(len, (OFF_T)sum.blength);
 463                 char *map = map_ptr(mapbuf, offset, n1);
 464                 uint32 sum1 = get_checksum1(map, n1);
 465                 char sum2[SUM_LENGTH];
 466
 467                 if (f_copy >= 0)
 468                         full_write(f_copy, map, n1);
 469
 470                 get_checksum2(map, n1, sum2);
 471
 472                 if (verbose > 3) {
 473                         rprintf(FINFO,
 474                                 "chunk[%.0f] offset=%.0f len=%ld sum1=%08lx\n",
 475                                 (double)i, (double)offset, (long)n1,
 476                                 (unsigned long)sum1);
 477                 }
 478                 write_int(f_out, sum1);
 479                 write_buf(f_out, sum2, sum.s2length);
 480                 len -= n1;
 481                 offset += n1;
 482         }
 483
 484         if (mapbuf)
 485                 unmap_file(mapbuf);
 486 }
 487
 488
 489 /* Try to find a filename in the same dir as "fname" with a similar name. */
 490 static int find_fuzzy(struct file_struct *file, struct file_list *dirlist)
 491 {
 492         int fname_len, fname_suf_len;
 493         const char *fname_suf, *fname = file->basename;
 494         uint32 lowest_dist = 0x7FFFFFFF;
 495         int j, lowest_j = -1;
 496
 497         fname_len = strlen(fname);
 498         fname_suf = find_filename_suffix(fname, fname_len, &fname_suf_len);
 499
 500         for (j = 0; j < dirlist->count; j++) {
 501                 struct file_struct *fp = dirlist->files[j];
 502                 const char *suf, *name;
 503                 int len, suf_len;
 504                 uint32 dist;
 505
 506                 if (!S_ISREG(fp->mode) || !fp->length
 507                     || fp->flags & FLAG_NO_FUZZY)
 508                         continue;
 509
 510                 name = fp->basename;
 511
 512                 if (fp->length == file->length
 513                     && fp->modtime == file->modtime) {
 514                         if (verbose > 4) {
 515                                 rprintf(FINFO,
 516                                         "fuzzy size/modtime match for %s\n",
 517                                         name);
 518                         }
 519                         return j;
 520                 }
 521
 522                 len = strlen(name);
 523                 suf = find_filename_suffix(name, len, &suf_len);
 524
 525                 dist = fuzzy_distance(name, len, fname, fname_len);
 526                 /* Add some extra weight to how well the suffixes match. */
 527                 dist += fuzzy_distance(suf, suf_len, fname_suf, fname_suf_len)
 528                       * 10;
 529                 if (verbose > 4) {
 530                         rprintf(FINFO, "fuzzy distance for %s = %d.%05d\n",
 531                                 name, (int)(dist>>16), (int)(dist&0xFFFF));
 532                 }
 533                 if (dist <= lowest_dist) {
 534                         lowest_dist = dist;
 535                         lowest_j = j;
 536                 }
 537         }
 538
 539         return lowest_j;
 540 }
 541
 542
 543 /* Acts on flist->file's ndx'th item, whose name is fname.  If a directory,
 544  * make sure it exists, and has the right permissions/timestamp info.  For
 545  * all other non-regular files (symlinks, etc.) we create them here.  For
 546  * regular files that have changed, we try to find a basis file and then
 547  * start sending checksums.
 548  *
 549  * Note that f_out is set to -1 when doing final directory-permission and
 550  * modification-time repair. */
 551 static void recv_generator(char *fname, struct file_list *flist,
 552                            struct file_struct *file, int ndx,
 553                            int itemizing, int maybe_PERMS_REPORT,
 554                            enum logcode code, int allowed_lull,
 555                            int f_out, int f_out_name)
 556 {
 557         static int missing_below = -1, excluded_below = -1;
 558         static char *fuzzy_dirname = NULL;
 559         static struct file_list *fuzzy_dirlist = NULL;
 560         struct file_struct *fuzzy_file = NULL;
 561         int fd = -1, f_copy = -1;
 562         STRUCT_STAT st, partial_st;
 563         struct file_struct *back_file = NULL;
 564         int statret, stat_errno;
 565         char *fnamecmp, *partialptr, *backupptr = NULL;
 566         char fnamecmpbuf[MAXPATHLEN];
 567         uchar fnamecmp_type;
 568
 569         if (list_only)
 570                 return;
 571
 572         if (!fname) {
 573                 if (fuzzy_dirlist) {
 574                         flist_free(fuzzy_dirlist);
 575                         fuzzy_dirlist = NULL;
 576                         fuzzy_dirname = NULL;
 577                 }
 578                 if (missing_below >= 0) {
 579                         dry_run--;
 580                         missing_below = -1;
 581                 }
 582                 return;
 583         }
 584
 585         if (verbose > 2) {
 586                 rprintf(FINFO, "recv_generator(%s,%d)\n",
 587                         safe_fname(fname), ndx);
 588         }
 589
 590         if (server_filter_list.head) {
 591                 if (excluded_below >= 0) {
 592                         if (file->dir.depth > excluded_below)
 593                                 goto skipping;
 594                         excluded_below = -1;
 595                 }
 596                 if (check_filter(&server_filter_list, fname,
 597                                  S_ISDIR(file->mode)) < 0) {
 598                         if (S_ISDIR(file->mode))
 599                                 excluded_below = file->dir.depth;
 600                     skipping:
 601                         if (verbose) {
 602                                 rprintf(FINFO,
 603                                         "skipping server-excluded file \"%s\"\n",
 604                                         safe_fname(fname));
 605                         }
 606                         return;
 607                 }
 608         }
 609
 610         if (missing_below >= 0 && file->dir.depth <= missing_below) {
 611                 dry_run--;
 612                 missing_below = -1;
 613         }
 614         if (dry_run > 1) {
 615                 statret = -1;
 616                 stat_errno = ENOENT;
 617         } else {
 618                 if (fuzzy_basis && S_ISREG(file->mode)) {
 619                         char *dn = file->dirname ? file->dirname : ".";
 620                         /* Yes, identical dirnames are guaranteed to have
 621                          * identical pointers at this point. */
 622                         if (fuzzy_dirname != dn) {
 623                                 if (fuzzy_dirlist)
 624                                         flist_free(fuzzy_dirlist);
 625                                 fuzzy_dirname = dn;
 626                                 fuzzy_dirlist = get_dirlist(fuzzy_dirname, -1,
 627                                                             1);
 628                         }
 629                 }
 630
 631                 statret = link_stat(fname, &st,
 632                                     keep_dirlinks && S_ISDIR(file->mode));
 633                 stat_errno = errno;
 634         }
 635
 636         if (only_existing && statret == -1 && stat_errno == ENOENT) {
 637                 /* we only want to update existing files */
 638                 if (verbose > 1) {
 639                         rprintf(FINFO, "not creating new file \"%s\"\n",
 640                                 safe_fname(fname));
 641                 }
 642                 return;
 643         }
 644
 645         if (statret == 0 && !preserve_perms
 646             && S_ISDIR(st.st_mode) == S_ISDIR(file->mode)) {
 647                 /* if the file exists already and we aren't perserving
 648                  * permissions then act as though the remote end sent
 649                  * us the file permissions we already have */
 650                 file->mode = (file->mode & ~CHMOD_BITS)
 651                            | (st.st_mode & CHMOD_BITS);
 652         }
 653
 654         if (S_ISDIR(file->mode)) {
 655                 /* The file to be received is a directory, so we need
 656                  * to prepare appropriately.  If there is already a
 657                  * file of that name and it is *not* a directory, then
 658                  * we need to delete it.  If it doesn't exist, then
 659                  * (perhaps recursively) create it. */
 660                 if (statret == 0 && !S_ISDIR(st.st_mode)) {
 661                         delete_item(fname, st.st_mode, DEL_TERSE);
 662                         statret = -1;
 663                 }
 664                 if (dry_run && statret != 0 && missing_below < 0) {
 665                         missing_below = file->dir.depth;
 666                         dry_run++;
 667                 }
 668                 if (itemizing && f_out != -1)
 669                         itemize(file, statret, &st, 0, f_out, ndx);
 670                 if (statret != 0 && do_mkdir(fname,file->mode) != 0 && errno != EEXIST) {
 671                         if (!relative_paths || errno != ENOENT
 672                             || create_directory_path(fname, orig_umask) < 0
 673                             || do_mkdir(fname, file->mode) < 0) {
 674                                 rsyserr(FERROR, errno,
 675                                         "recv_generator: mkdir %s failed",
 676                                         full_fname(fname));
 677                         }
 678                 }
 679                 if (set_perms(fname, file, statret ? NULL : &st, 0)
 680                     && verbose && code && f_out != -1)
 681                         rprintf(code, "%s/\n", safe_fname(fname));
 682                 if (delete_during && f_out != -1 && csum_length != SUM_LENGTH
 683                     && (file->flags & FLAG_DEL_HERE))
 684                         delete_in_dir(flist, fname, file, allowed_lull);
 685                 return;
 686         }
 687
 688         if (max_size && file->length > max_size) {
 689                 if (verbose > 1) {
 690                         rprintf(FINFO, "%s is over max-size\n",
 691                                 safe_fname(fname));
 692                 }
 693                 return;
 694         }
 695
 696         if (preserve_links && S_ISLNK(file->mode)) {
 697 #ifdef SUPPORT_LINKS
 698                 if (safe_symlinks && unsafe_symlink(file->u.link, fname)) {
 699                         if (verbose) {
 700                                 rprintf(FINFO,
 701                                         "ignoring unsafe symlink %s -> \"%s\"\n",
 702                                         full_fname(fname),
 703                                         safe_fname(file->u.link));
 704                         }
 705                         return;
 706                 }
 707                 if (statret == 0) {
 708                         char lnk[MAXPATHLEN];
 709                         int len;
 710
 711                         if (!S_ISDIR(st.st_mode)
 712                             && (len = readlink(fname, lnk, MAXPATHLEN-1)) > 0) {
 713                                 lnk[len] = 0;
 714                                 /* A link already pointing to the
 715                                  * right place -- no further action
 716                                  * required. */
 717                                 if (strcmp(lnk, file->u.link) == 0) {
 718                                         if (itemizing) {
 719                                                 itemize(file, 0, &st, 0,
 720                                                         f_out, ndx);
 721                                         }
 722                                         set_perms(fname, file, &st,
 723                                                   maybe_PERMS_REPORT);
 724                                         return;
 725                                 }
 726                         }
 727                         /* Not the right symlink (or not a symlink), so
 728                          * delete it. */
 729                         if (S_ISLNK(st.st_mode))
 730                                 delete_item(fname, st.st_mode, DEL_TERSE);
 731                         else {
 732                                 delete_item(fname, st.st_mode, DEL_TERSE);
 733                                 statret = -1;
 734                         }
 735                 }
 736                 if (do_symlink(file->u.link,fname) != 0) {
 737                         rsyserr(FERROR, errno, "symlink %s -> \"%s\" failed",
 738                                 full_fname(fname), safe_fname(file->u.link));
 739                 } else {
 740                         set_perms(fname,file,NULL,0);
 741                         if (itemizing) {
 742                                 itemize(file, statret, &st, ITEM_UPDATING,
 743                                         f_out, ndx);
 744                         }
 745                         if (code && verbose) {
 746                                 rprintf(code, "%s -> %s\n", safe_fname(fname),
 747                                         safe_fname(file->u.link));
 748                         }
 749                         if (remove_sent_files && !dry_run) {
 750                                 char numbuf[4];
 751                                 SIVAL(numbuf, 0, ndx);
 752                                 send_msg(MSG_SUCCESS, numbuf, 4);
 753                         }
 754                 }
 755 #endif
 756                 return;
 757         }
 758
 759         if (am_root && preserve_devices && IS_DEVICE(file->mode)) {
 760                 if (statret != 0 ||
 761                     st.st_mode != file->mode ||
 762                     st.st_rdev != file->u.rdev) {
 763                         delete_item(fname, st.st_mode, DEL_TERSE);
 764                         if (!IS_DEVICE(st.st_mode))
 765                                 statret = -1;
 766                         if (verbose > 2) {
 767                                 rprintf(FINFO,"mknod(%s,0%o,0x%x)\n",
 768                                         safe_fname(fname),
 769                                         (int)file->mode, (int)file->u.rdev);
 770                         }
 771                         if (do_mknod(fname,file->mode,file->u.rdev) != 0) {
 772                                 rsyserr(FERROR, errno, "mknod %s failed",
 773                                         full_fname(fname));
 774                         } else {
 775                                 set_perms(fname,file,NULL,0);
 776                                 if (itemizing) {
 777                                         itemize(file, statret, &st, ITEM_UPDATING,
 778                                                 f_out, ndx);
 779                                 }
 780                                 if (code && verbose) {
 781                                         rprintf(code, "%s\n",
 782                                                 safe_fname(fname));
 783                                 }
 784                         }
 785                 } else {
 786                         if (itemizing) {
 787                                 itemize(file, statret, &st, 0,
 788                                         f_out, ndx);
 789                         }
 790                         set_perms(fname, file, &st, maybe_PERMS_REPORT);
 791                 }
 792                 return;
 793         }
 794
 795         if (preserve_hard_links && hard_link_check(file, HL_CHECK_MASTER))
 796                 return;
 797
 798         if (!S_ISREG(file->mode)) {
 799                 rprintf(FINFO, "skipping non-regular file \"%s\"\n",
 800                         safe_fname(fname));
 801                 return;
 802         }
 803
 804         if (opt_ignore_existing && statret == 0) {
 805                 if (verbose > 1)
 806                         rprintf(FINFO, "%s exists\n", safe_fname(fname));
 807                 return;
 808         }
 809
 810         if (update_only && statret == 0
 811             && cmp_modtime(st.st_mtime, file->modtime) > 0) {
 812                 if (verbose > 1)
 813                         rprintf(FINFO, "%s is newer\n", safe_fname(fname));
 814                 return;
 815         }
 816
 817         fnamecmp = fname;
 818         fnamecmp_type = FNAMECMP_FNAME;
 819
 820         if (statret != 0 && basis_dir[0] != NULL) {
 821                 int best_match = -1;
 822                 int match_level = 0;
 823                 int i = 0;
 824                 do {
 825                         pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 826                                  basis_dir[i], fname);
 827                         if (link_stat(fnamecmpbuf, &st, 0) < 0
 828                             || !S_ISREG(st.st_mode))
 829                                 continue;
 830                         switch (match_level) {
 831                         case 0:
 832                                 best_match = i;
 833                                 match_level = 1;
 834                                 /* FALL THROUGH */
 835                         case 1:
 836                                 if (!unchanged_file(fnamecmpbuf, file, &st))
 837                                         continue;
 838                                 best_match = i;
 839                                 match_level = 2;
 840                                 /* FALL THROUGH */
 841                         case 2:
 842                                 if (!unchanged_attrs(file, &st))
 843                                         continue;
 844                                 best_match = i;
 845                                 match_level = 3;
 846                                 break;
 847                         }
 848                         break;
 849                 } while (basis_dir[++i] != NULL);
 850                 if (match_level) {
 851                         statret = 0;
 852                         if (i != best_match) {
 853                                 i = best_match;
 854                                 pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 855                                          basis_dir[i], fname);
 856                                 if (link_stat(fnamecmpbuf, &st, 0) < 0) {
 857                                         match_level = 0;
 858                                         statret = -1;
 859                                         stat_errno = errno;
 860                                 }
 861                         }
 862 #ifdef HAVE_LINK
 863                         if (link_dest && match_level == 3
 864                             && do_link(fnamecmpbuf, fname) < 0) {
 865                                 if (verbose) {
 866                                         rsyserr(FINFO, errno, "link %s => %s",
 867                                                 full_fname(fnamecmpbuf),
 868                                                 safe_fname(fname));
 869                                 }
 870                                 match_level = 2;
 871                         }
 872 #endif
 873                         if (compare_dest || (match_level && match_level < 3)) {
 874                                 fnamecmp = fnamecmpbuf;
 875                                 fnamecmp_type = i;
 876                         }
 877                 }
 878         }
 879
 880         if (statret == 0 && !S_ISREG(st.st_mode)) {
 881                 if (delete_item(fname, st.st_mode, DEL_TERSE) != 0)
 882                         return;
 883                 statret = -1;
 884                 stat_errno = ENOENT;
 885         }
 886
 887         if (partial_dir && (partialptr = partial_dir_fname(fname)) != NULL
 888             && link_stat(partialptr, &partial_st, 0) == 0
 889             && S_ISREG(partial_st.st_mode)) {
 890                 if (statret != 0)
 891                         goto prepare_to_open;
 892         } else
 893                 partialptr = NULL;
 894
 895         if (statret != 0 && fuzzy_basis && dry_run <= 1) {
 896                 int j = find_fuzzy(file, fuzzy_dirlist);
 897                 if (j >= 0) {
 898                         fuzzy_file = fuzzy_dirlist->files[j];
 899                         f_name_to(fuzzy_file, fnamecmpbuf);
 900                         if (verbose > 2) {
 901                                 rprintf(FINFO, "fuzzy basis selected for %s: %s\n",
 902                                         safe_fname(fname), safe_fname(fnamecmpbuf));
 903                         }
 904                         st.st_mode = fuzzy_file->mode;
 905                         st.st_size = fuzzy_file->length;
 906                         st.st_mtime = fuzzy_file->modtime;
 907                         statret = 0;
 908                         fnamecmp = fnamecmpbuf;
 909                         fnamecmp_type = FNAMECMP_FUZZY;
 910                 }
 911         }
 912
 913         if (statret != 0) {
 914                 if (preserve_hard_links && hard_link_check(file, HL_SKIP))
 915                         return;
 916                 if (stat_errno == ENOENT)
 917                         goto notify_others;
 918                 if (verbose > 1) {
 919                         rsyserr(FERROR, stat_errno,
 920                                 "recv_generator: failed to stat %s",
 921                                 full_fname(fname));
 922                 }
 923                 return;
 924         }
 925
 926         if (!compare_dest && fnamecmp_type <= FNAMECMP_BASIS_DIR_HIGH)
 927                 ;
 928         else if (fnamecmp_type == FNAMECMP_FUZZY)
 929                 ;
 930         else if (unchanged_file(fnamecmp, file, &st)) {
 931                 if (fnamecmp_type == FNAMECMP_FNAME) {
 932                         if (itemizing)
 933                                 itemize(file, statret, &st, 0, f_out, ndx);
 934                         set_perms(fname, file, &st, maybe_PERMS_REPORT);
 935                         return;
 936                 }
 937                 /* Only --compare-dest gets here. */
 938                 if (unchanged_attrs(file, &st)) {
 939                         itemize(file, statret, &st, ITEM_NO_DEST_AND_NO_UPDATE,
 940                                 f_out, ndx);
 941                         return;
 942                 }
 943         }
 944
 945 prepare_to_open:
 946         if (partialptr) {
 947                 st = partial_st;
 948                 fnamecmp = partialptr;
 949                 fnamecmp_type = FNAMECMP_PARTIAL_DIR;
 950                 statret = 0;
 951         }
 952
 953         if (dry_run || read_batch)
 954                 goto notify_others;
 955         if (whole_file > 0) {
 956                 if (statret == 0)
 957                         statret = 1;
 958                 goto notify_others;
 959         }
 960
 961         if (fuzzy_basis) {
 962                 int j = flist_find(fuzzy_dirlist, file);
 963                 if (j >= 0) /* don't use changing file as future fuzzy basis */
 964                         fuzzy_dirlist->files[j]->flags |= FLAG_NO_FUZZY;
 965         }
 966
 967         /* open the file */
 968         fd = do_open(fnamecmp, O_RDONLY, 0);
 969
 970         if (fd == -1) {
 971                 rsyserr(FERROR, errno, "failed to open %s, continuing",
 972                         full_fname(fnamecmp));
 973             pretend_missing:
 974                 /* pretend the file didn't exist */
 975                 if (preserve_hard_links && hard_link_check(file, HL_SKIP))
 976                         return;
 977                 statret = -1;
 978                 goto notify_others;
 979         }
 980
 981         if (inplace && make_backups) {
 982                 if (!(backupptr = get_backup_name(fname))) {
 983                         close(fd);
 984                         return;
 985                 }
 986                 if (!(back_file = make_file(fname, NULL, NO_FILTERS))) {
 987                         close(fd);
 988                         goto pretend_missing;
 989                 }
 990                 if (robust_unlink(backupptr) && errno != ENOENT) {
 991                         rsyserr(FERROR, errno, "unlink %s",
 992                                 full_fname(backupptr));
 993                         free(back_file);
 994                         close(fd);
 995                         return;
 996                 }
 997                 if ((f_copy = do_open(backupptr,
 998                     O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0600)) < 0) {
 999                         rsyserr(FERROR, errno, "open %s",
1000                                 full_fname(backupptr));
1001                         free(back_file);
1002                         close(fd);
1003                         return;
1004                 }
1005                 fnamecmp_type = FNAMECMP_BACKUP;
1006         }
1007
1008         if (verbose > 3) {
1009                 rprintf(FINFO, "gen mapped %s of size %.0f\n",
1010                         safe_fname(fnamecmp), (double)st.st_size);
1011         }
1012
1013         if (verbose > 2)
1014                 rprintf(FINFO, "generating and sending sums for %d\n", ndx);
1015
1016 notify_others:
1017         write_int(f_out, ndx);
1018         if (itemizing) {
1019                 int iflags = ITEM_UPDATING;
1020                 if (always_checksum)
1021                         iflags |= ITEM_REPORT_CHECKSUM;
1022                 if (fnamecmp_type != FNAMECMP_FNAME)
1023                         iflags |= ITEM_USING_ALT_BASIS;
1024                 itemize(file, statret, &st, iflags, f_out, -1);
1025         }
1026         if (f_out_name >= 0) {
1027                 write_byte(f_out_name, fnamecmp_type);
1028                 if (fnamecmp_type == FNAMECMP_FUZZY) {
1029                         uchar lenbuf[3], *lb = lenbuf;
1030                         int len = strlen(fuzzy_file->basename);
1031                         if (len > 0x7F) {
1032 #if MAXPATHLEN > 0x7FFF
1033                                 *lb++ = len / 0x10000 + 0x80;
1034                                 *lb++ = len / 0x100;
1035 #else
1036                                 *lb++ = len / 0x100 + 0x80;
1037 #endif
1038                         }
1039                         *lb = len;
1040                         write_buf(f_out_name, (char*)lenbuf, lb - lenbuf + 1);
1041                         write_buf(f_out_name, fuzzy_file->basename, len);
1042                 }
1043         }
1044
1045         if (dry_run || read_batch)
1046                 return;
1047
1048         if (statret == 0) {
1049                 generate_and_send_sums(fd, st.st_size, f_out, f_copy);
1050
1051                 if (f_copy >= 0) {
1052                         close(f_copy);
1053                         set_perms(backupptr, back_file, NULL, 0);
1054                         if (verbose > 1) {
1055                                 rprintf(FINFO, "backed up %s to %s\n",
1056                                         safe_fname(fname), safe_fname(backupptr));
1057                         }
1058                         free(back_file);
1059                 }
1060
1061                 close(fd);
1062         } else
1063                 write_sum_head(f_out, NULL);
1064 }
1065
1066
1067 void generate_files(int f_out, struct file_list *flist, char *local_name,
1068                     int f_out_name)
1069 {
1070         int i;
1071         int phase = 0;
1072         char fbuf[MAXPATHLEN];
1073         int itemizing, maybe_PERMS_REPORT;
1074         enum logcode code;
1075         int need_retouch_dir_times = preserve_times && !omit_dir_times;
1076         int need_retouch_dir_perms = 0;
1077         int save_only_existing = only_existing;
1078         int save_opt_ignore_existing = opt_ignore_existing;
1079         int allowed_lull = read_batch ? 0 : (io_timeout + 1) / 2;
1080         int lull_mod = allowed_lull * 5;
1081
1082         if (protocol_version >= 29) {
1083                 itemizing = 1;
1084                 maybe_PERMS_REPORT = log_format_has_i ? 0 : PERMS_REPORT;
1085                 code = daemon_log_format_has_i ? 0 : FLOG;
1086         } else if (am_daemon) {
1087                 itemizing = daemon_log_format_has_i && !dry_run;
1088                 maybe_PERMS_REPORT = PERMS_REPORT;
1089                 code = itemizing || dry_run ? FCLIENT : FINFO;
1090         } else if (!am_server) {
1091                 itemizing = log_format_has_i;
1092                 maybe_PERMS_REPORT = log_format_has_i ? 0 : PERMS_REPORT;
1093                 code = itemizing ? 0 : FINFO;
1094         } else {
1095                 itemizing = 0;
1096                 maybe_PERMS_REPORT = PERMS_REPORT;
1097                 code = FINFO;
1098         }
1099
1100         if (verbose > 2) {
1101                 rprintf(FINFO, "generator starting pid=%ld count=%d\n",
1102                         (long)getpid(), flist->count);
1103         }
1104
1105         if (delete_before && !local_name && flist->count > 0)
1106                 do_delete_pass(flist, allowed_lull);
1107
1108         if (verbose >= 2) {
1109                 rprintf(FINFO, "delta-transmission %s\n",
1110                         whole_file > 0
1111                         ? "disabled for local transfer or --whole-file"
1112                         : "enabled");
1113         }
1114
1115         if (protocol_version < 29)
1116                 ignore_timeout = 1;
1117
1118         for (i = 0; i < flist->count; i++) {
1119                 struct file_struct *file = flist->files[i];
1120                 struct file_struct copy;
1121
1122                 if (!file->basename)
1123                         continue;
1124
1125                 /* We need to ensure that any dirs we create have writeable
1126                  * permissions during the time we are putting files within
1127                  * them.  This is then fixed after the transfer is done. */
1128                 if (!am_root && S_ISDIR(file->mode) && !(file->mode & S_IWUSR)) {
1129                         copy = *file;
1130                         copy.mode |= S_IWUSR; /* user write */
1131                         file = &copy;
1132                         need_retouch_dir_perms = 1;
1133                 }
1134
1135                 recv_generator(local_name ? local_name : f_name_to(file, fbuf),
1136                                flist, file, i, itemizing, maybe_PERMS_REPORT,
1137                                code, allowed_lull, f_out, f_out_name);
1138
1139                 if (allowed_lull && !(i % lull_mod))
1140                         maybe_send_keepalive(allowed_lull, flist->count);
1141         }
1142         recv_generator(NULL, NULL, NULL, 0, 0, 0, code, 0, -1, -1);
1143         if (delete_during)
1144                 delete_in_dir(NULL, NULL, NULL, 0);
1145
1146         phase++;
1147         csum_length = SUM_LENGTH;
1148         only_existing = max_size = opt_ignore_existing = 0;
1149         update_only = always_checksum = size_only = 0;
1150         ignore_times = 1;
1151         make_backups = 0; /* avoid a duplicate backup for inplace processing */
1152
1153         /* We expect to just sit around now, so don't exit on a timeout.
1154          * If we really get a timeout then the other process should exit. */
1155         ignore_timeout = 1;
1156
1157         if (verbose > 2)
1158                 rprintf(FINFO,"generate_files phase=%d\n",phase);
1159
1160         write_int(f_out, -1);
1161
1162         /* files can cycle through the system more than once
1163          * to catch initial checksum errors */
1164         while ((i = get_redo_num()) != -1) {
1165                 struct file_struct *file = flist->files[i];
1166                 recv_generator(local_name ? local_name : f_name_to(file, fbuf),
1167                                flist, file, i, itemizing, maybe_PERMS_REPORT,
1168                                code, allowed_lull, f_out, f_out_name);
1169         }
1170
1171         phase++;
1172         only_existing = save_only_existing;
1173         opt_ignore_existing = save_opt_ignore_existing;
1174
1175         if (verbose > 2)
1176                 rprintf(FINFO,"generate_files phase=%d\n",phase);
1177
1178         write_int(f_out, -1);
1179
1180         /* Read post-redo-phase MSG_DONE and any prior messages. */
1181         get_redo_num();
1182
1183         if (preserve_hard_links)
1184                 do_hard_links(allowed_lull, flist->count);
1185
1186         if (delete_after && !local_name && flist->count > 0)
1187                 do_delete_pass(flist, allowed_lull);
1188
1189         if ((need_retouch_dir_perms || need_retouch_dir_times)
1190             && !list_only && !local_name && !dry_run) {
1191                 int j = 0;
1192                 /* Now we need to fix any directory permissions that were
1193                  * modified during the transfer and/or re-set any tweaked
1194                  * modified-time values. */
1195                 for (i = 0; i < flist->count; i++) {
1196                         struct file_struct *file = flist->files[i];
1197                         if (!file->basename || !S_ISDIR(file->mode))
1198                                 continue;
1199                         if (!need_retouch_dir_times && file->mode & S_IWUSR)
1200                                 continue;
1201                         recv_generator(local_name ? local_name : f_name(file),
1202                                        flist, file, i, itemizing,
1203                                        maybe_PERMS_REPORT, code, allowed_lull,
1204                                        -1, -1);
1205                         if (allowed_lull && !(j++ % lull_mod))
1206                                 maybe_send_keepalive(allowed_lull, flist->count);
1207                 }
1208         }
1209         recv_generator(NULL, NULL, NULL, 0, 0, 0, code, 0, -1, -1);
1210
1211         if (verbose > 2)
1212                 rprintf(FINFO,"generate_files finished\n");
1213 }