generator.c

   1 /* -*- c-file-style: "linux" -*-
   2
   3    rsync -- fast file replication program
   4
   5    Copyright (C) 1996-2000 by Andrew Tridgell
   6    Copyright (C) Paul Mackerras 1996
   7    Copyright (C) 2002 by Martin Pool <mbp@samba.org>
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 #include "rsync.h"
  25
  26 extern int verbose;
  27 extern int dry_run;
  28 extern int log_format_has_i;
  29 extern int log_format_has_o_or_i;
  30 extern int daemon_log_format_has_i;
  31 extern int am_root;
  32 extern int am_server;
  33 extern int am_daemon;
  34 extern int recurse;
  35 extern int relative_paths;
  36 extern int keep_dirlinks;
  37 extern int preserve_links;
  38 extern int preserve_devices;
  39 extern int preserve_hard_links;
  40 extern int preserve_perms;
  41 extern int preserve_uid;
  42 extern int preserve_gid;
  43 extern int preserve_times;
  44 extern int omit_dir_times;
  45 extern int delete_before;
  46 extern int delete_during;
  47 extern int delete_after;
  48 extern int module_id;
  49 extern int ignore_errors;
  50 extern int remove_sent_files;
  51 extern int update_only;
  52 extern int opt_ignore_existing;
  53 extern int inplace;
  54 extern int make_backups;
  55 extern int csum_length;
  56 extern int ignore_times;
  57 extern int size_only;
  58 extern OFF_T max_size;
  59 extern int io_timeout;
  60 extern int io_error;
  61 extern int sock_f_out;
  62 extern int ignore_timeout;
  63 extern int protocol_version;
  64 extern int fuzzy_basis;
  65 extern int always_checksum;
  66 extern char *partial_dir;
  67 extern char *basis_dir[];
  68 extern int compare_dest;
  69 extern int link_dest;
  70 extern int whole_file;
  71 extern int local_server;
  72 extern int list_only;
  73 extern int read_batch;
  74 extern int only_existing;
  75 extern int orig_umask;
  76 extern int safe_symlinks;
  77 extern long block_size; /* "long" because popt can't set an int32. */
  78 extern int max_delete;
  79 extern int force_delete;
  80 extern int one_file_system;
  81 extern struct stats stats;
  82 extern dev_t filesystem_dev;
  83 extern char *backup_dir;
  84 extern char *backup_suffix;
  85 extern int backup_suffix_len;
  86 extern struct file_list *the_file_list;
  87 extern struct filter_list_struct server_filter_list;
  88
  89 int allowed_lull = 0;
  90
  91 static int deletion_count = 0; /* used to implement --max-delete */
  92
  93
  94 static int is_backup_file(char *fn)
  95 {
  96         int k = strlen(fn) - backup_suffix_len;
  97         return k > 0 && strcmp(fn+k, backup_suffix) == 0;
  98 }
  99
 100
 101 /* Delete a file or directory.  If DEL_FORCE_RECURSE is set in the flags, or if
 102  * force_delete is set, this will delete recursively as long as DEL_NO_RECURSE
 103  * is not set in the flags. */
 104 static int delete_item(char *fname, int mode, int flags)
 105 {
 106         struct file_list *dirlist;
 107         char buf[MAXPATHLEN];
 108         int j, dlen, zap_dir, ok;
 109         void *save_filters;
 110
 111         if (!S_ISDIR(mode)) {
 112                 if (max_delete && ++deletion_count > max_delete)
 113                         return 0;
 114                 if (make_backups && (backup_dir || !is_backup_file(fname)))
 115                         ok = make_backup(fname);
 116                 else
 117                         ok = robust_unlink(fname) == 0;
 118                 if (ok) {
 119                         if (!(flags & DEL_TERSE))
 120                                 log_delete(fname, mode);
 121                         return 0;
 122                 }
 123                 if (errno == ENOENT) {
 124                         deletion_count--;
 125                         return 0;
 126                 }
 127                 rsyserr(FERROR, errno, "delete_file: unlink %s failed",
 128                         full_fname(fname));
 129                 return -1;
 130         }
 131
 132         zap_dir = (flags & DEL_FORCE_RECURSE || (force_delete && recurse))
 133                 && !(flags & DEL_NO_RECURSE);
 134         if ((max_delete && ++deletion_count > max_delete)
 135             || (dry_run && zap_dir)) {
 136                 ok = 0;
 137                 errno = ENOTEMPTY;
 138         } else if (make_backups && !backup_dir && !is_backup_file(fname)
 139             && !(flags & DEL_FORCE_RECURSE))
 140                 ok = make_backup(fname);
 141         else
 142                 ok = do_rmdir(fname) == 0;
 143         if (ok) {
 144                 if (!(flags & DEL_TERSE))
 145                         log_delete(fname, mode);
 146                 return 0;
 147         }
 148         if (errno == ENOENT) {
 149                 deletion_count--;
 150                 return 0;
 151         }
 152         if (!zap_dir || (errno != ENOTEMPTY && errno != EEXIST)) {
 153                 rsyserr(FERROR, errno, "delete_file: rmdir %s failed",
 154                         full_fname(fname));
 155                 return -1;
 156         }
 157         flags |= DEL_FORCE_RECURSE; /* mark subdir dels as not "in the way" */
 158         deletion_count--;
 159
 160         dlen = strlcpy(buf, fname, MAXPATHLEN);
 161         save_filters = push_local_filters(buf, dlen);
 162
 163         dirlist = get_dirlist(buf, dlen, 0);
 164         for (j = dirlist->count; j--; ) {
 165                 struct file_struct *fp = dirlist->files[j];
 166
 167                 if (fp->flags & FLAG_MOUNT_POINT)
 168                         continue;
 169
 170                 f_name_to(fp, buf);
 171                 if (delete_item(buf, fp->mode, flags & ~DEL_TERSE) != 0) {
 172                         flist_free(dirlist);
 173                         return -1;
 174                 }
 175         }
 176         flist_free(dirlist);
 177
 178         pop_local_filters(save_filters);
 179
 180         if (max_delete && ++deletion_count > max_delete)
 181                 return 0;
 182
 183         if (do_rmdir(fname) == 0) {
 184                 if (!(flags & DEL_TERSE))
 185                         log_delete(fname, mode);
 186         } else if (errno != ENOTEMPTY && errno != ENOENT) {
 187                 rsyserr(FERROR, errno, "delete_file: rmdir %s failed",
 188                         full_fname(fname));
 189                 return -1;
 190         }
 191
 192         return 0;
 193 }
 194
 195
 196 /* This function is used to implement per-directory deletion, and is used by
 197  * all the --delete-WHEN options.  Note that the fbuf pointer must point to a
 198  * MAXPATHLEN buffer with the name of the directory in it (the functions we
 199  * call will append names onto the end, but the old dir value will be restored
 200  * on exit). */
 201 static void delete_in_dir(struct file_list *flist, char *fbuf,
 202                           struct file_struct *file)
 203 {
 204         static int min_depth = MAXPATHLEN, cur_depth = -1;
 205         static void *filt_array[MAXPATHLEN/2+1];
 206         static int already_output_warning = 0;
 207         struct file_list *dirlist;
 208         char delbuf[MAXPATHLEN];
 209         STRUCT_STAT st;
 210         int dlen, i;
 211
 212         if (!flist) {
 213                 while (cur_depth >= min_depth)
 214                         pop_local_filters(filt_array[cur_depth--]);
 215                 min_depth = MAXPATHLEN;
 216                 cur_depth = -1;
 217                 return;
 218         }
 219
 220         if (verbose > 2)
 221                 rprintf(FINFO, "delete_in_dir(%s)\n", safe_fname(fbuf));
 222
 223         if (allowed_lull)
 224                 maybe_send_keepalive();
 225
 226         if (file->dir.depth >= MAXPATHLEN/2+1)
 227                 return; /* Impossible... */
 228
 229         if (io_error && !(lp_ignore_errors(module_id) || ignore_errors)) {
 230                 if (already_output_warning)
 231                         return;
 232                 rprintf(FINFO,
 233                         "IO error encountered -- skipping file deletion\n");
 234                 already_output_warning = 1;
 235                 return;
 236         }
 237
 238         while (cur_depth >= file->dir.depth && cur_depth >= min_depth)
 239                 pop_local_filters(filt_array[cur_depth--]);
 240         cur_depth = file->dir.depth;
 241         if (min_depth > cur_depth)
 242                 min_depth = cur_depth;
 243         dlen = strlen(fbuf);
 244         filt_array[cur_depth] = push_local_filters(fbuf, dlen);
 245
 246         if (link_stat(fbuf, &st, keep_dirlinks) < 0)
 247                 return;
 248
 249         if (one_file_system && file->flags & FLAG_TOP_DIR)
 250                 filesystem_dev = st.st_dev;
 251
 252         dirlist = get_dirlist(fbuf, dlen, 0);
 253
 254         /* If an item in dirlist is not found in flist, delete it
 255          * from the filesystem. */
 256         for (i = dirlist->count; i--; ) {
 257                 if (!dirlist->files[i]->basename)
 258                         continue;
 259                 if (flist_find(flist, dirlist->files[i]) < 0) {
 260                         int mode = dirlist->files[i]->mode;
 261                         f_name_to(dirlist->files[i], delbuf);
 262                         if (delete_item(delbuf, mode, DEL_FORCE_RECURSE) < 0)
 263                                 break;
 264                 }
 265         }
 266
 267         flist_free(dirlist);
 268 }
 269
 270 /* This deletes any files on the receiving side that are not present on the
 271  * sending side.  This is used by --delete-before and --delete-after. */
 272 static void do_delete_pass(struct file_list *flist)
 273 {
 274         char fbuf[MAXPATHLEN];
 275         int j;
 276
 277         if (dry_run > 1) /* destination doesn't exist yet */
 278                 return;
 279
 280         for (j = 0; j < flist->count; j++) {
 281                 struct file_struct *file = flist->files[j];
 282
 283                 if (!(file->flags & FLAG_DEL_HERE))
 284                         continue;
 285
 286                 f_name_to(file, fbuf);
 287                 if (verbose > 1 && file->flags & FLAG_TOP_DIR)
 288                         rprintf(FINFO, "deleting in %s\n", safe_fname(fbuf));
 289
 290                 delete_in_dir(flist, fbuf, file);
 291         }
 292 }
 293
 294 static int unchanged_attrs(struct file_struct *file, STRUCT_STAT *st)
 295 {
 296         if (preserve_perms
 297          && (st->st_mode & CHMOD_BITS) != (file->mode & CHMOD_BITS))
 298                 return 0;
 299
 300         if (am_root && preserve_uid && st->st_uid != file->uid)
 301                 return 0;
 302
 303         if (preserve_gid && file->gid != GID_NONE && st->st_gid != file->gid)
 304                 return 0;
 305
 306         return 1;
 307 }
 308
 309
 310 void itemize(struct file_struct *file, int ndx, int statret, STRUCT_STAT *st,
 311              int32 iflags, char *hlink)
 312 {
 313         if (statret == 0) {
 314                 if (S_ISREG(file->mode) && file->length != st->st_size)
 315                         iflags |= ITEM_REPORT_SIZE;
 316                 if (!(iflags & ITEM_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_TRANSFER|ITEM_LOCAL_CHANGE) && !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;
 334                 if (!(iflags & (ITEM_HARD_LINKED|ITEM_LOCAL_CHANGE)))
 335                         iflags |= ITEM_TRANSFER;
 336         }
 337
 338         iflags &= 0xffff;
 339         if ((iflags & SIGNIFICANT_ITEM_FLAGS || verbose > 1
 340           || (hlink && *hlink)) && !read_batch) {
 341                 if (protocol_version >= 29) {
 342                         if (ndx >= 0)
 343                                 write_int(sock_f_out, ndx);
 344                         write_shortint(sock_f_out, iflags);
 345                         if (hlink)
 346                                 write_vstring(sock_f_out, hlink, strlen(hlink));
 347                 } else if (ndx >= 0)
 348                         log_item(file, &stats, iflags, hlink);
 349         }
 350 }
 351
 352
 353 /* Perform our quick-check heuristic for determining if a file is unchanged. */
 354 static int unchanged_file(char *fn, struct file_struct *file, STRUCT_STAT *st)
 355 {
 356         if (st->st_size != file->length)
 357                 return 0;
 358
 359         /* if always checksum is set then we use the checksum instead
 360            of the file time to determine whether to sync */
 361         if (always_checksum && S_ISREG(st->st_mode)) {
 362                 char sum[MD4_SUM_LENGTH];
 363                 file_checksum(fn, sum, st->st_size);
 364                 return memcmp(sum, file->u.sum, protocol_version < 21 ? 2
 365                                                         : MD4_SUM_LENGTH) == 0;
 366         }
 367
 368         if (size_only)
 369                 return 1;
 370
 371         if (ignore_times)
 372                 return 0;
 373
 374         return cmp_modtime(st->st_mtime, file->modtime) == 0;
 375 }
 376
 377
 378 /*
 379  * set (initialize) the size entries in the per-file sum_struct
 380  * calculating dynamic block and checksum sizes.
 381  *
 382  * This is only called from generate_and_send_sums() but is a separate
 383  * function to encapsulate the logic.
 384  *
 385  * The block size is a rounded square root of file length.
 386  *
 387  * The checksum size is determined according to:
 388  *     blocksum_bits = BLOCKSUM_BIAS + 2*log2(file_len) - log2(block_len)
 389  * provided by Donovan Baarda which gives a probability of rsync
 390  * algorithm corrupting data and falling back using the whole md4
 391  * checksums.
 392  *
 393  * This might be made one of several selectable heuristics.
 394  */
 395 static void sum_sizes_sqroot(struct sum_struct *sum, int64 len)
 396 {
 397         int32 blength;
 398         int s2length;
 399
 400         if (block_size)
 401                 blength = block_size;
 402         else if (len <= BLOCK_SIZE * BLOCK_SIZE)
 403                 blength = BLOCK_SIZE;
 404         else {
 405                 int32 c;
 406                 int64 l;
 407                 int cnt;
 408                 for (c = 1, l = len, cnt = 0; l >>= 2; c <<= 1, cnt++) {}
 409                 if (cnt >= 31 || c >= MAX_BLOCK_SIZE)
 410                         blength = MAX_BLOCK_SIZE;
 411                 else {
 412                     blength = 0;
 413                     do {
 414                             blength |= c;
 415                             if (len < (int64)blength * blength)
 416                                     blength &= ~c;
 417                             c >>= 1;
 418                     } while (c >= 8);   /* round to multiple of 8 */
 419                     blength = MAX(blength, BLOCK_SIZE);
 420                 }
 421         }
 422
 423         if (protocol_version < 27) {
 424                 s2length = csum_length;
 425         } else if (csum_length == SUM_LENGTH) {
 426                 s2length = SUM_LENGTH;
 427         } else {
 428                 int32 c;
 429                 int64 l;
 430                 int b = BLOCKSUM_BIAS;
 431                 for (l = len; l >>= 1; b += 2) {}
 432                 for (c = blength; c >>= 1 && b; b--) {}
 433                 /* add a bit, subtract rollsum, round up. */
 434                 s2length = (b + 1 - 32 + 7) / 8; /* --optimize in compiler-- */
 435                 s2length = MAX(s2length, csum_length);
 436                 s2length = MIN(s2length, SUM_LENGTH);
 437         }
 438
 439         sum->flength    = len;
 440         sum->blength    = blength;
 441         sum->s2length   = s2length;
 442         sum->count      = (len + (blength - 1)) / blength;
 443         sum->remainder  = (len % blength);
 444
 445         if (sum->count && verbose > 2) {
 446                 rprintf(FINFO,
 447                         "count=%.0f rem=%ld blength=%ld s2length=%d flength=%.0f\n",
 448                         (double)sum->count, (long)sum->remainder, (long)sum->blength,
 449                         sum->s2length, (double)sum->flength);
 450         }
 451 }
 452
 453
 454 /*
 455  * Generate and send a stream of signatures/checksums that describe a buffer
 456  *
 457  * Generate approximately one checksum every block_len bytes.
 458  */
 459 static void generate_and_send_sums(int fd, OFF_T len, int f_out, int f_copy)
 460 {
 461         int32 i;
 462         struct map_struct *mapbuf;
 463         struct sum_struct sum;
 464         OFF_T offset = 0;
 465
 466         sum_sizes_sqroot(&sum, len);
 467
 468         if (len > 0)
 469                 mapbuf = map_file(fd, len, MAX_MAP_SIZE, sum.blength);
 470         else
 471                 mapbuf = NULL;
 472
 473         write_sum_head(f_out, &sum);
 474
 475         for (i = 0; i < sum.count; i++) {
 476                 int32 n1 = (int32)MIN(len, (OFF_T)sum.blength);
 477                 char *map = map_ptr(mapbuf, offset, n1);
 478                 uint32 sum1 = get_checksum1(map, n1);
 479                 char sum2[SUM_LENGTH];
 480
 481                 if (f_copy >= 0)
 482                         full_write(f_copy, map, n1);
 483
 484                 get_checksum2(map, n1, sum2);
 485
 486                 if (verbose > 3) {
 487                         rprintf(FINFO,
 488                                 "chunk[%.0f] offset=%.0f len=%ld sum1=%08lx\n",
 489                                 (double)i, (double)offset, (long)n1,
 490                                 (unsigned long)sum1);
 491                 }
 492                 write_int(f_out, sum1);
 493                 write_buf(f_out, sum2, sum.s2length);
 494                 len -= n1;
 495                 offset += n1;
 496         }
 497
 498         if (mapbuf)
 499                 unmap_file(mapbuf);
 500 }
 501
 502
 503 /* Try to find a filename in the same dir as "fname" with a similar name. */
 504 static int find_fuzzy(struct file_struct *file, struct file_list *dirlist)
 505 {
 506         int fname_len, fname_suf_len;
 507         const char *fname_suf, *fname = file->basename;
 508         uint32 lowest_dist = 0x7FFFFFFF;
 509         int j, lowest_j = -1;
 510
 511         fname_len = strlen(fname);
 512         fname_suf = find_filename_suffix(fname, fname_len, &fname_suf_len);
 513
 514         for (j = 0; j < dirlist->count; j++) {
 515                 struct file_struct *fp = dirlist->files[j];
 516                 const char *suf, *name;
 517                 int len, suf_len;
 518                 uint32 dist;
 519
 520                 if (!S_ISREG(fp->mode) || !fp->length
 521                     || fp->flags & FLAG_NO_FUZZY)
 522                         continue;
 523
 524                 name = fp->basename;
 525
 526                 if (fp->length == file->length
 527                     && fp->modtime == file->modtime) {
 528                         if (verbose > 4) {
 529                                 rprintf(FINFO,
 530                                         "fuzzy size/modtime match for %s\n",
 531                                         name);
 532                         }
 533                         return j;
 534                 }
 535
 536                 len = strlen(name);
 537                 suf = find_filename_suffix(name, len, &suf_len);
 538
 539                 dist = fuzzy_distance(name, len, fname, fname_len);
 540                 /* Add some extra weight to how well the suffixes match. */
 541                 dist += fuzzy_distance(suf, suf_len, fname_suf, fname_suf_len)
 542                       * 10;
 543                 if (verbose > 4) {
 544                         rprintf(FINFO, "fuzzy distance for %s = %d.%05d\n",
 545                                 name, (int)(dist>>16), (int)(dist&0xFFFF));
 546                 }
 547                 if (dist <= lowest_dist) {
 548                         lowest_dist = dist;
 549                         lowest_j = j;
 550                 }
 551         }
 552
 553         return lowest_j;
 554 }
 555
 556 void check_for_finished_hlinks(int itemizing, enum logcode code)
 557 {
 558         struct file_struct *file;
 559         int ndx;
 560
 561         while ((ndx = get_hlink_num()) != -1) {
 562                 if (ndx < 0 || ndx >= the_file_list->count)
 563                         continue;
 564
 565                 file = the_file_list->files[ndx];
 566                 if (!file->link_u.links)
 567                         continue;
 568
 569                 hard_link_cluster(file, ndx, itemizing, code);
 570         }
 571 }
 572
 573 static int phase = 0;
 574
 575 /* Acts on the_file_list->file's ndx'th item, whose name is fname.  If a dir,
 576  * make sure it exists, and has the right permissions/timestamp info.  For
 577  * all other non-regular files (symlinks, etc.) we create them here.  For
 578  * regular files that have changed, we try to find a basis file and then
 579  * start sending checksums.
 580  *
 581  * Note that f_out is set to -1 when doing final directory-permission and
 582  * modification-time repair. */
 583 static void recv_generator(char *fname, struct file_struct *file, int ndx,
 584                            int itemizing, int maybe_PERMS_REPORT,
 585                            enum logcode code, int f_out, int f_out_name)
 586 {
 587         static int missing_below = -1, excluded_below = -1;
 588         static char *fuzzy_dirname = NULL;
 589         static struct file_list *fuzzy_dirlist = NULL;
 590         struct file_struct *fuzzy_file = NULL;
 591         int fd = -1, f_copy = -1;
 592         STRUCT_STAT st, partial_st;
 593         struct file_struct *back_file = NULL;
 594         int statret, stat_errno;
 595         char *fnamecmp, *partialptr, *backupptr = NULL;
 596         char fnamecmpbuf[MAXPATHLEN];
 597         uchar fnamecmp_type;
 598
 599         if (list_only)
 600                 return;
 601
 602         if (!fname) {
 603                 if (fuzzy_dirlist) {
 604                         flist_free(fuzzy_dirlist);
 605                         fuzzy_dirlist = NULL;
 606                         fuzzy_dirname = NULL;
 607                 }
 608                 if (missing_below >= 0) {
 609                         dry_run--;
 610                         missing_below = -1;
 611                 }
 612                 return;
 613         }
 614
 615         if (verbose > 2) {
 616                 rprintf(FINFO, "recv_generator(%s,%d)\n",
 617                         safe_fname(fname), ndx);
 618         }
 619
 620         if (server_filter_list.head) {
 621                 if (excluded_below >= 0) {
 622                         if (file->dir.depth > excluded_below)
 623                                 goto skipping;
 624                         excluded_below = -1;
 625                 }
 626                 if (check_filter(&server_filter_list, fname,
 627                                  S_ISDIR(file->mode)) < 0) {
 628                         if (S_ISDIR(file->mode))
 629                                 excluded_below = file->dir.depth;
 630                     skipping:
 631                         if (verbose) {
 632                                 rprintf(FINFO,
 633                                         "skipping server-excluded file \"%s\"\n",
 634                                         safe_fname(fname));
 635                         }
 636                         return;
 637                 }
 638         }
 639
 640         if (missing_below >= 0 && file->dir.depth <= missing_below) {
 641                 dry_run--;
 642                 missing_below = -1;
 643         }
 644         if (dry_run > 1) {
 645                 statret = -1;
 646                 stat_errno = ENOENT;
 647         } else {
 648                 if (fuzzy_basis && S_ISREG(file->mode)) {
 649                         char *dn = file->dirname ? file->dirname : ".";
 650                         /* Yes, identical dirnames are guaranteed to have
 651                          * identical pointers at this point. */
 652                         if (fuzzy_dirname != dn) {
 653                                 if (fuzzy_dirlist)
 654                                         flist_free(fuzzy_dirlist);
 655                                 fuzzy_dirname = dn;
 656                                 fuzzy_dirlist = get_dirlist(fuzzy_dirname, -1,
 657                                                             1);
 658                         }
 659                 }
 660
 661                 statret = link_stat(fname, &st,
 662                                     keep_dirlinks && S_ISDIR(file->mode));
 663                 stat_errno = errno;
 664         }
 665
 666         if (only_existing && statret == -1 && stat_errno == ENOENT) {
 667                 /* we only want to update existing files */
 668                 if (verbose > 1) {
 669                         rprintf(FINFO, "not creating new file \"%s\"\n",
 670                                 safe_fname(fname));
 671                 }
 672                 return;
 673         }
 674
 675         if (statret == 0 && !preserve_perms
 676             && S_ISDIR(st.st_mode) == S_ISDIR(file->mode)) {
 677                 /* if the file exists already and we aren't perserving
 678                  * permissions then act as though the remote end sent
 679                  * us the file permissions we already have */
 680                 file->mode = (file->mode & ~CHMOD_BITS)
 681                            | (st.st_mode & CHMOD_BITS);
 682         }
 683
 684         if (S_ISDIR(file->mode)) {
 685                 /* The file to be received is a directory, so we need
 686                  * to prepare appropriately.  If there is already a
 687                  * file of that name and it is *not* a directory, then
 688                  * we need to delete it.  If it doesn't exist, then
 689                  * (perhaps recursively) create it. */
 690                 if (statret == 0 && !S_ISDIR(st.st_mode)) {
 691                         delete_item(fname, st.st_mode, DEL_TERSE);
 692                         statret = -1;
 693                 }
 694                 if (dry_run && statret != 0 && missing_below < 0) {
 695                         missing_below = file->dir.depth;
 696                         dry_run++;
 697                 }
 698                 if (itemizing && f_out != -1) {
 699                         itemize(file, ndx, statret, &st,
 700                                 statret ? ITEM_LOCAL_CHANGE : 0, NULL);
 701                 }
 702                 if (statret != 0 && do_mkdir(fname,file->mode) != 0 && errno != EEXIST) {
 703                         if (!relative_paths || errno != ENOENT
 704                             || create_directory_path(fname, orig_umask) < 0
 705                             || do_mkdir(fname, file->mode) < 0) {
 706                                 rsyserr(FERROR, errno,
 707                                         "recv_generator: mkdir %s failed",
 708                                         full_fname(fname));
 709                         }
 710                 }
 711                 if (set_perms(fname, file, statret ? NULL : &st, 0)
 712                     && verbose && code && f_out != -1)
 713                         rprintf(code, "%s/\n", safe_fname(fname));
 714                 if (delete_during && f_out != -1 && !phase && dry_run < 2
 715                     && (file->flags & FLAG_DEL_HERE))
 716                         delete_in_dir(the_file_list, fname, file);
 717                 return;
 718         }
 719
 720         if (max_size && file->length > max_size) {
 721                 if (verbose > 1) {
 722                         rprintf(FINFO, "%s is over max-size\n",
 723                                 safe_fname(fname));
 724                 }
 725                 return;
 726         }
 727
 728         if (preserve_links && S_ISLNK(file->mode)) {
 729 #ifdef SUPPORT_LINKS
 730                 if (safe_symlinks && unsafe_symlink(file->u.link, fname)) {
 731                         if (verbose) {
 732                                 rprintf(FINFO,
 733                                         "ignoring unsafe symlink %s -> \"%s\"\n",
 734                                         full_fname(fname),
 735                                         safe_fname(file->u.link));
 736                         }
 737                         return;
 738                 }
 739                 if (statret == 0) {
 740                         char lnk[MAXPATHLEN];
 741                         int len;
 742
 743                         if (!S_ISDIR(st.st_mode)
 744                             && (len = readlink(fname, lnk, MAXPATHLEN-1)) > 0) {
 745                                 lnk[len] = 0;
 746                                 /* A link already pointing to the
 747                                  * right place -- no further action
 748                                  * required. */
 749                                 if (strcmp(lnk, file->u.link) == 0) {
 750                                         if (itemizing) {
 751                                                 itemize(file, ndx, 0, &st, 0,
 752                                                         NULL);
 753                                         }
 754                                         set_perms(fname, file, &st,
 755                                                   maybe_PERMS_REPORT);
 756                                         return;
 757                                 }
 758                         }
 759                         /* Not the right symlink (or not a symlink), so
 760                          * delete it. */
 761                         if (S_ISLNK(st.st_mode))
 762                                 delete_item(fname, st.st_mode, DEL_TERSE);
 763                         else {
 764                                 delete_item(fname, st.st_mode, DEL_TERSE);
 765                                 statret = -1;
 766                         }
 767                 }
 768                 if (do_symlink(file->u.link,fname) != 0) {
 769                         rsyserr(FERROR, errno, "symlink %s -> \"%s\" failed",
 770                                 full_fname(fname), safe_fname(file->u.link));
 771                 } else {
 772                         set_perms(fname,file,NULL,0);
 773                         if (itemizing) {
 774                                 itemize(file, ndx, statret, &st,
 775                                         ITEM_LOCAL_CHANGE, NULL);
 776                         }
 777                         if (code && verbose) {
 778                                 rprintf(code, "%s -> %s\n", safe_fname(fname),
 779                                         safe_fname(file->u.link));
 780                         }
 781                         if (remove_sent_files && !dry_run) {
 782                                 char numbuf[4];
 783                                 SIVAL(numbuf, 0, ndx);
 784                                 send_msg(MSG_SUCCESS, numbuf, 4);
 785                         }
 786                 }
 787 #endif
 788                 return;
 789         }
 790
 791         if (am_root && preserve_devices && IS_DEVICE(file->mode)) {
 792                 if (statret != 0 ||
 793                     st.st_mode != file->mode ||
 794                     st.st_rdev != file->u.rdev) {
 795                         delete_item(fname, st.st_mode, DEL_TERSE);
 796                         if (!IS_DEVICE(st.st_mode))
 797                                 statret = -1;
 798                         if (verbose > 2) {
 799                                 rprintf(FINFO,"mknod(%s,0%o,0x%x)\n",
 800                                         safe_fname(fname),
 801                                         (int)file->mode, (int)file->u.rdev);
 802                         }
 803                         if (do_mknod(fname,file->mode,file->u.rdev) != 0) {
 804                                 rsyserr(FERROR, errno, "mknod %s failed",
 805                                         full_fname(fname));
 806                         } else {
 807                                 set_perms(fname,file,NULL,0);
 808                                 if (itemizing) {
 809                                         itemize(file, ndx, statret, &st,
 810                                                 ITEM_LOCAL_CHANGE, NULL);
 811                                 }
 812                                 if (code && verbose) {
 813                                         rprintf(code, "%s\n",
 814                                                 safe_fname(fname));
 815                                 }
 816                         }
 817                 } else {
 818                         if (itemizing)
 819                                 itemize(file, ndx, statret, &st, 0, NULL);
 820                         set_perms(fname, file, &st, maybe_PERMS_REPORT);
 821                 }
 822                 return;
 823         }
 824
 825         if (preserve_hard_links && hard_link_check(file, ndx, HL_CHECK_MASTER))
 826                 return;
 827
 828         if (!S_ISREG(file->mode)) {
 829                 rprintf(FINFO, "skipping non-regular file \"%s\"\n",
 830                         safe_fname(fname));
 831                 return;
 832         }
 833
 834         if (opt_ignore_existing && statret == 0) {
 835                 if (verbose > 1)
 836                         rprintf(FINFO, "%s exists\n", safe_fname(fname));
 837                 return;
 838         }
 839
 840         if (update_only && statret == 0
 841             && cmp_modtime(st.st_mtime, file->modtime) > 0) {
 842                 if (verbose > 1)
 843                         rprintf(FINFO, "%s is newer\n", safe_fname(fname));
 844                 return;
 845         }
 846
 847         fnamecmp = fname;
 848         fnamecmp_type = FNAMECMP_FNAME;
 849
 850         if (statret != 0 && basis_dir[0] != NULL) {
 851                 int best_match = -1;
 852                 int match_level = 0;
 853                 int i = 0;
 854                 do {
 855                         pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 856                                  basis_dir[i], fname);
 857                         if (link_stat(fnamecmpbuf, &st, 0) < 0
 858                             || !S_ISREG(st.st_mode))
 859                                 continue;
 860                         switch (match_level) {
 861                         case 0:
 862                                 best_match = i;
 863                                 match_level = 1;
 864                                 /* FALL THROUGH */
 865                         case 1:
 866                                 if (!unchanged_file(fnamecmpbuf, file, &st))
 867                                         continue;
 868                                 best_match = i;
 869                                 match_level = 2;
 870                                 /* FALL THROUGH */
 871                         case 2:
 872                                 if (!unchanged_attrs(file, &st))
 873                                         continue;
 874                                 best_match = i;
 875                                 match_level = 3;
 876                                 break;
 877                         }
 878                         break;
 879                 } while (basis_dir[++i] != NULL);
 880                 if (match_level) {
 881                         statret = 0;
 882                         if (i != best_match) {
 883                                 i = best_match;
 884                                 pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 885                                          basis_dir[i], fname);
 886                                 if (link_stat(fnamecmpbuf, &st, 0) < 0) {
 887                                         match_level = 0;
 888                                         statret = -1;
 889                                         stat_errno = errno;
 890                                 }
 891                         }
 892 #ifdef HAVE_LINK
 893                         if (link_dest && match_level == 3) {
 894                                 if (hard_link_one(file, ndx, fname, -1, &st,
 895                                                   fnamecmpbuf, 1,
 896                                                   itemizing && verbose > 1,
 897                                                   code) == 0)
 898                                         return;
 899                                 if (verbose) {
 900                                         rsyserr(FINFO, errno, "link %s => %s",
 901                                                 full_fname(fnamecmpbuf),
 902                                                 safe_fname(fname));
 903                                 }
 904                                 match_level = 2;
 905                         }
 906 #endif
 907                         if (compare_dest || (match_level && match_level < 3)) {
 908                                 fnamecmp = fnamecmpbuf;
 909                                 fnamecmp_type = i;
 910                         }
 911                 }
 912         }
 913
 914         if (statret == 0 && !S_ISREG(st.st_mode)) {
 915                 if (delete_item(fname, st.st_mode, DEL_TERSE) != 0)
 916                         return;
 917                 statret = -1;
 918                 stat_errno = ENOENT;
 919         }
 920
 921         if (partial_dir && (partialptr = partial_dir_fname(fname)) != NULL
 922             && link_stat(partialptr, &partial_st, 0) == 0
 923             && S_ISREG(partial_st.st_mode)) {
 924                 if (statret != 0)
 925                         goto prepare_to_open;
 926         } else
 927                 partialptr = NULL;
 928
 929         if (statret != 0 && fuzzy_basis && dry_run <= 1) {
 930                 int j = find_fuzzy(file, fuzzy_dirlist);
 931                 if (j >= 0) {
 932                         fuzzy_file = fuzzy_dirlist->files[j];
 933                         f_name_to(fuzzy_file, fnamecmpbuf);
 934                         if (verbose > 2) {
 935                                 rprintf(FINFO, "fuzzy basis selected for %s: %s\n",
 936                                         safe_fname(fname), safe_fname(fnamecmpbuf));
 937                         }
 938                         st.st_mode = fuzzy_file->mode;
 939                         st.st_size = fuzzy_file->length;
 940                         st.st_mtime = fuzzy_file->modtime;
 941                         statret = 0;
 942                         fnamecmp = fnamecmpbuf;
 943                         fnamecmp_type = FNAMECMP_FUZZY;
 944                 }
 945         }
 946
 947         if (statret != 0) {
 948                 if (preserve_hard_links && hard_link_check(file, ndx, HL_SKIP))
 949                         return;
 950                 if (stat_errno == ENOENT)
 951                         goto notify_others;
 952                 if (verbose > 1) {
 953                         rsyserr(FERROR, stat_errno,
 954                                 "recv_generator: failed to stat %s",
 955                                 full_fname(fname));
 956                 }
 957                 return;
 958         }
 959
 960         if (!compare_dest && fnamecmp_type <= FNAMECMP_BASIS_DIR_HIGH)
 961                 ;
 962         else if (fnamecmp_type == FNAMECMP_FUZZY)
 963                 ;
 964         else if (unchanged_file(fnamecmp, file, &st)) {
 965                 if (fnamecmp_type == FNAMECMP_FNAME) {
 966                         if (itemizing)
 967                                 itemize(file, ndx, statret, &st, 0, NULL);
 968                         set_perms(fname, file, &st, maybe_PERMS_REPORT);
 969                         if (preserve_hard_links && file->link_u.links)
 970                                 hard_link_cluster(file, ndx, itemizing, code);
 971                         return;
 972                 }
 973                 /* Only --compare-dest gets here. */
 974                 if (unchanged_attrs(file, &st)) {
 975                         itemize(file, ndx, statret, &st,
 976                                 ITEM_NO_DEST_AND_NO_UPDATE, NULL);
 977                         return;
 978                 }
 979         }
 980
 981 prepare_to_open:
 982         if (partialptr) {
 983                 st = partial_st;
 984                 fnamecmp = partialptr;
 985                 fnamecmp_type = FNAMECMP_PARTIAL_DIR;
 986                 statret = 0;
 987         }
 988
 989         if (dry_run || read_batch || whole_file)
 990                 goto notify_others;
 991
 992         if (fuzzy_basis) {
 993                 int j = flist_find(fuzzy_dirlist, file);
 994                 if (j >= 0) /* don't use changing file as future fuzzy basis */
 995                         fuzzy_dirlist->files[j]->flags |= FLAG_NO_FUZZY;
 996         }
 997
 998         /* open the file */
 999         fd = do_open(fnamecmp, O_RDONLY, 0);
1000
1001         if (fd == -1) {
1002                 rsyserr(FERROR, errno, "failed to open %s, continuing",
1003                         full_fname(fnamecmp));
1004             pretend_missing:
1005                 /* pretend the file didn't exist */
1006                 if (preserve_hard_links && hard_link_check(file, ndx, HL_SKIP))
1007                         return;
1008                 statret = -1;
1009                 goto notify_others;
1010         }
1011
1012         if (inplace && make_backups) {
1013                 if (!(backupptr = get_backup_name(fname))) {
1014                         close(fd);
1015                         return;
1016                 }
1017                 if (!(back_file = make_file(fname, NULL, NO_FILTERS))) {
1018                         close(fd);
1019                         goto pretend_missing;
1020                 }
1021                 if (robust_unlink(backupptr) && errno != ENOENT) {
1022                         rsyserr(FERROR, errno, "unlink %s",
1023                                 full_fname(backupptr));
1024                         free(back_file);
1025                         close(fd);
1026                         return;
1027                 }
1028                 if ((f_copy = do_open(backupptr,
1029                     O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0600)) < 0) {
1030                         rsyserr(FERROR, errno, "open %s",
1031                                 full_fname(backupptr));
1032                         free(back_file);
1033                         close(fd);
1034                         return;
1035                 }
1036                 fnamecmp_type = FNAMECMP_BACKUP;
1037         }
1038
1039         if (verbose > 3) {
1040                 rprintf(FINFO, "gen mapped %s of size %.0f\n",
1041                         safe_fname(fnamecmp), (double)st.st_size);
1042         }
1043
1044         if (verbose > 2)
1045                 rprintf(FINFO, "generating and sending sums for %d\n", ndx);
1046
1047 notify_others:
1048         write_int(f_out, ndx);
1049         if (itemizing) {
1050                 int iflags = ITEM_TRANSFER;
1051                 if (always_checksum)
1052                         iflags |= ITEM_REPORT_CHECKSUM;
1053                 if (fnamecmp_type != FNAMECMP_FNAME)
1054                         iflags |= ITEM_USING_ALT_BASIS;
1055                 itemize(file, -1, statret, &st, iflags, NULL);
1056         }
1057         if (f_out_name >= 0) {
1058                 write_byte(f_out_name, fnamecmp_type);
1059                 if (fnamecmp_type == FNAMECMP_FUZZY) {
1060                         write_vstring(f_out_name, fuzzy_file->basename,
1061                                       strlen(fuzzy_file->basename));
1062                 }
1063         }
1064
1065         if (dry_run) {
1066                 if (preserve_hard_links && file->link_u.links)
1067                         hard_link_cluster(file, ndx, itemizing, code);
1068                 return;
1069         }
1070         if (read_batch)
1071                 return;
1072
1073         if (statret != 0 || whole_file) {
1074                 write_sum_head(f_out, NULL);
1075                 return;
1076         }
1077
1078         generate_and_send_sums(fd, st.st_size, f_out, f_copy);
1079
1080         if (f_copy >= 0) {
1081                 close(f_copy);
1082                 set_perms(backupptr, back_file, NULL, 0);
1083                 if (verbose > 1) {
1084                         rprintf(FINFO, "backed up %s to %s\n",
1085                                 safe_fname(fname), safe_fname(backupptr));
1086                 }
1087                 free(back_file);
1088         }
1089
1090         close(fd);
1091 }
1092
1093
1094 void generate_files(int f_out, struct file_list *flist, char *local_name,
1095                     int f_out_name)
1096 {
1097         int i, lull_mod;
1098         char fbuf[MAXPATHLEN];
1099         int itemizing, maybe_PERMS_REPORT;
1100         enum logcode code;
1101         int need_retouch_dir_times = preserve_times && !omit_dir_times;
1102         int need_retouch_dir_perms = 0;
1103         int save_only_existing = only_existing;
1104         int save_opt_ignore_existing = opt_ignore_existing;
1105
1106         allowed_lull = read_batch ? 0 : (io_timeout + 1) / 2;
1107         lull_mod = allowed_lull * 5;
1108
1109         if (protocol_version >= 29) {
1110                 itemizing = 1;
1111                 maybe_PERMS_REPORT = log_format_has_i ? 0 : PERMS_REPORT;
1112                 code = daemon_log_format_has_i ? 0 : FLOG;
1113         } else if (am_daemon) {
1114                 itemizing = daemon_log_format_has_i && !dry_run;
1115                 maybe_PERMS_REPORT = PERMS_REPORT;
1116                 code = itemizing || dry_run ? FCLIENT : FINFO;
1117         } else if (!am_server) {
1118                 itemizing = log_format_has_i;
1119                 maybe_PERMS_REPORT = log_format_has_i ? 0 : PERMS_REPORT;
1120                 code = itemizing ? 0 : FINFO;
1121         } else {
1122                 itemizing = 0;
1123                 maybe_PERMS_REPORT = PERMS_REPORT;
1124                 code = FINFO;
1125         }
1126
1127         if (verbose > 2) {
1128                 rprintf(FINFO, "generator starting pid=%ld count=%d\n",
1129                         (long)getpid(), flist->count);
1130         }
1131
1132         if (delete_before && !local_name && flist->count > 0)
1133                 do_delete_pass(flist);
1134
1135         if (whole_file < 0)
1136                 whole_file = 0;
1137         if (verbose >= 2) {
1138                 rprintf(FINFO, "delta-transmission %s\n",
1139                         whole_file
1140                         ? "disabled for local transfer or --whole-file"
1141                         : "enabled");
1142         }
1143
1144         if (protocol_version < 29)
1145                 ignore_timeout = 1;
1146
1147         for (i = 0; i < flist->count; i++) {
1148                 struct file_struct *file = flist->files[i];
1149
1150                 if (!file->basename)
1151                         continue;
1152
1153                 recv_generator(local_name ? local_name : f_name_to(file, fbuf),
1154                                file, i, itemizing, maybe_PERMS_REPORT, code,
1155                                f_out, f_out_name);
1156
1157                 /* We need to ensure that any dirs we create have writeable
1158                  * permissions during the time we are putting files within
1159                  * them.  This is then fixed after the transfer is done. */
1160                 if (!am_root && S_ISDIR(file->mode) && !(file->mode & S_IWUSR)) {
1161                         int mode = file->mode | S_IWUSR; /* user write */
1162                         char *fname = local_name ? local_name : fbuf;
1163                         if (do_chmod(fname, mode & CHMOD_BITS) < 0) {
1164                                 rsyserr(FERROR, errno,
1165                                         "failed to modify permissions on %s",
1166                                         full_fname(fname));
1167                         }
1168                         need_retouch_dir_perms = 1;
1169                 }
1170
1171                 if (preserve_hard_links)
1172                         check_for_finished_hlinks(itemizing, code);
1173
1174                 if (allowed_lull && !(i % lull_mod))
1175                         maybe_send_keepalive();
1176         }
1177         recv_generator(NULL, NULL, 0, 0, 0, code, -1, -1);
1178         if (delete_during)
1179                 delete_in_dir(NULL, NULL, NULL);
1180
1181         phase++;
1182         csum_length = SUM_LENGTH;
1183         only_existing = max_size = opt_ignore_existing = 0;
1184         update_only = always_checksum = size_only = 0;
1185         ignore_times = 1;
1186         make_backups = 0; /* avoid a duplicate backup for inplace processing */
1187
1188         /* We expect to just sit around now, so don't exit on a timeout.
1189          * If we really get a timeout then the other process should exit. */
1190         ignore_timeout = 1;
1191
1192         if (verbose > 2)
1193                 rprintf(FINFO,"generate_files phase=%d\n",phase);
1194
1195         write_int(f_out, -1);
1196
1197         /* files can cycle through the system more than once
1198          * to catch initial checksum errors */
1199         while ((i = get_redo_num(itemizing, code)) != -1) {
1200                 struct file_struct *file = flist->files[i];
1201                 recv_generator(local_name ? local_name : f_name_to(file, fbuf),
1202                                file, i, itemizing, maybe_PERMS_REPORT, code,
1203                                f_out, f_out_name);
1204         }
1205
1206         phase++;
1207         only_existing = save_only_existing;
1208         opt_ignore_existing = save_opt_ignore_existing;
1209
1210         if (verbose > 2)
1211                 rprintf(FINFO,"generate_files phase=%d\n",phase);
1212
1213         write_int(f_out, -1);
1214
1215         /* Read post-redo-phase MSG_DONE and any prior messages. */
1216         get_redo_num(itemizing, code);
1217
1218         if (delete_after && !local_name && flist->count > 0)
1219                 do_delete_pass(flist);
1220
1221         if ((need_retouch_dir_perms || need_retouch_dir_times)
1222             && !list_only && !local_name && !dry_run) {
1223                 int j = 0;
1224                 /* Now we need to fix any directory permissions that were
1225                  * modified during the transfer and/or re-set any tweaked
1226                  * modified-time values. */
1227                 for (i = 0; i < flist->count; i++) {
1228                         struct file_struct *file = flist->files[i];
1229                         if (!file->basename || !S_ISDIR(file->mode))
1230                                 continue;
1231                         if (!need_retouch_dir_times && file->mode & S_IWUSR)
1232                                 continue;
1233                         recv_generator(local_name ? local_name : f_name(file),
1234                                        file, i, itemizing, maybe_PERMS_REPORT,
1235                                        code, -1, -1);
1236                         if (allowed_lull && !(j++ % lull_mod))
1237                                 maybe_send_keepalive();
1238                 }
1239         }
1240         recv_generator(NULL, NULL, 0, 0, 0, code, -1, -1);
1241
1242         if (max_delete > 0 && deletion_count > max_delete) {
1243                 rprintf(FINFO,
1244                         "Deletions stopped due to --max-delete limit (%d skipped)\n",
1245                         deletion_count - max_delete);
1246                 io_error |= IOERR_DEL_LIMIT;
1247         }
1248
1249         if (verbose > 2)
1250                 rprintf(FINFO,"generate_files finished\n");
1251 }