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 (max_delete && deletion_count >= max_delete)
 112                 return -1;
 113
 114         if (!S_ISDIR(mode)) {
 115                 if (make_backups && (backup_dir || !is_backup_file(fname)))
 116                         ok = make_backup(fname);
 117                 else
 118                         ok = robust_unlink(fname) == 0;
 119                 if (ok) {
 120                         if (!(flags & DEL_TERSE))
 121                                 log_delete(fname, mode);
 122                         deletion_count++;
 123                         return 0;
 124                 }
 125                 if (errno == ENOENT)
 126                         return 0;
 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 (dry_run && zap_dir) {
 135                 ok = 0;
 136                 errno = ENOTEMPTY;
 137         } else if (make_backups && !backup_dir && !is_backup_file(fname)
 138             && !(flags & DEL_FORCE_RECURSE))
 139                 ok = make_backup(fname);
 140         else
 141                 ok = do_rmdir(fname) == 0;
 142         if (ok) {
 143                 if (!(flags & DEL_TERSE))
 144                         log_delete(fname, mode);
 145                 deletion_count++;
 146                 return 0;
 147         }
 148         if (errno == ENOENT)
 149                 return 0;
 150         if (!zap_dir || (errno != ENOTEMPTY && errno != EEXIST)) {
 151                 rsyserr(FERROR, errno, "delete_file: rmdir %s failed",
 152                         full_fname(fname));
 153                 return -1;
 154         }
 155         flags |= DEL_FORCE_RECURSE; /* mark subdir dels as not "in the way" */
 156
 157         dlen = strlcpy(buf, fname, MAXPATHLEN);
 158         save_filters = push_local_filters(buf, dlen);
 159
 160         dirlist = get_dirlist(buf, dlen, 0);
 161         for (j = dirlist->count; j--; ) {
 162                 struct file_struct *fp = dirlist->files[j];
 163
 164                 if (fp->flags & FLAG_MOUNT_POINT)
 165                         continue;
 166
 167                 f_name_to(fp, buf);
 168                 if (delete_item(buf, fp->mode, flags & ~DEL_TERSE) != 0) {
 169                         flist_free(dirlist);
 170                         return -1;
 171                 }
 172         }
 173         flist_free(dirlist);
 174
 175         pop_local_filters(save_filters);
 176
 177         if (max_delete && deletion_count >= max_delete)
 178                 return -1;
 179
 180         if (do_rmdir(fname) == 0) {
 181                 if (!(flags & DEL_TERSE))
 182                         log_delete(fname, mode);
 183                 deletion_count++;
 184         } else if (errno != ENOTEMPTY && errno != ENOENT) {
 185                 rsyserr(FERROR, errno, "delete_file: rmdir %s failed",
 186                         full_fname(fname));
 187                 return -1;
 188         }
 189
 190         return 0;
 191 }
 192
 193
 194 /* This function is used to implement per-directory deletion, and is used by
 195  * all the --delete-WHEN options.  Note that the fbuf pointer must point to a
 196  * MAXPATHLEN buffer with the name of the directory in it (the functions we
 197  * call will append names onto the end, but the old dir value will be restored
 198  * on exit). */
 199 static void delete_in_dir(struct file_list *flist, char *fbuf,
 200                           struct file_struct *file)
 201 {
 202         static int min_depth = MAXPATHLEN, cur_depth = -1;
 203         static void *filt_array[MAXPATHLEN/2+1];
 204         struct file_list *dirlist;
 205         char delbuf[MAXPATHLEN];
 206         STRUCT_STAT st;
 207         int dlen, i;
 208
 209         if (!flist) {
 210                 while (cur_depth >= min_depth)
 211                         pop_local_filters(filt_array[cur_depth--]);
 212                 min_depth = MAXPATHLEN;
 213                 cur_depth = -1;
 214                 return;
 215         }
 216
 217         if (verbose > 2)
 218                 rprintf(FINFO, "delete_in_dir(%s)\n", safe_fname(fbuf));
 219
 220         if (allowed_lull)
 221                 maybe_send_keepalive();
 222
 223         if (file->dir.depth >= MAXPATHLEN/2+1)
 224                 return; /* Impossible... */
 225
 226         if (max_delete && deletion_count >= max_delete)
 227                 return;
 228
 229         if (io_error && !(lp_ignore_errors(module_id) || ignore_errors)) {
 230                 rprintf(FINFO,
 231                         "IO error encountered -- skipping file deletion\n");
 232                 max_delete = -1; /* avoid duplicating the above warning */
 233                 return;
 234         }
 235
 236         while (cur_depth >= file->dir.depth && cur_depth >= min_depth)
 237                 pop_local_filters(filt_array[cur_depth--]);
 238         cur_depth = file->dir.depth;
 239         if (min_depth > cur_depth)
 240                 min_depth = cur_depth;
 241         dlen = strlen(fbuf);
 242         filt_array[cur_depth] = push_local_filters(fbuf, dlen);
 243
 244         if (link_stat(fbuf, &st, keep_dirlinks) < 0)
 245                 return;
 246
 247         if (one_file_system && file->flags & FLAG_TOP_DIR)
 248                 filesystem_dev = st.st_dev;
 249
 250         dirlist = get_dirlist(fbuf, dlen, 0);
 251
 252         /* If an item in dirlist is not found in flist, delete it
 253          * from the filesystem. */
 254         for (i = dirlist->count; i--; ) {
 255                 if (!dirlist->files[i]->basename)
 256                         continue;
 257                 if (flist_find(flist, dirlist->files[i]) < 0) {
 258                         int mode = dirlist->files[i]->mode;
 259                         f_name_to(dirlist->files[i], delbuf);
 260                         if (delete_item(delbuf, mode, DEL_FORCE_RECURSE) < 0)
 261                                 break;
 262                 }
 263         }
 264
 265         flist_free(dirlist);
 266 }
 267
 268 /* This deletes any files on the receiving side that are not present on the
 269  * sending side.  This is used by --delete-before and --delete-after. */
 270 static void do_delete_pass(struct file_list *flist)
 271 {
 272         char fbuf[MAXPATHLEN];
 273         int j;
 274
 275         for (j = 0; j < flist->count; j++) {
 276                 struct file_struct *file = flist->files[j];
 277
 278                 if (!(file->flags & FLAG_DEL_HERE))
 279                         continue;
 280
 281                 f_name_to(file, fbuf);
 282                 if (verbose > 1 && file->flags & FLAG_TOP_DIR)
 283                         rprintf(FINFO, "deleting in %s\n", safe_fname(fbuf));
 284
 285                 delete_in_dir(flist, fbuf, file);
 286         }
 287 }
 288
 289 static int unchanged_attrs(struct file_struct *file, STRUCT_STAT *st)
 290 {
 291         if (preserve_perms
 292          && (st->st_mode & CHMOD_BITS) != (file->mode & CHMOD_BITS))
 293                 return 0;
 294
 295         if (am_root && preserve_uid && st->st_uid != file->uid)
 296                 return 0;
 297
 298         if (preserve_gid && file->gid != GID_NONE && st->st_gid != file->gid)
 299                 return 0;
 300
 301         return 1;
 302 }
 303
 304
 305 void itemize(struct file_struct *file, int ndx, int statret, STRUCT_STAT *st,
 306              int32 iflags, char *hlink)
 307 {
 308         if (statret == 0) {
 309                 if (S_ISREG(file->mode) && file->length != st->st_size)
 310                         iflags |= ITEM_REPORT_SIZE;
 311                 if (!(iflags & ITEM_NO_DEST_AND_NO_UPDATE)) {
 312                         int keep_time = !preserve_times ? 0
 313                             : S_ISDIR(file->mode) ? !omit_dir_times
 314                             : !S_ISLNK(file->mode);
 315
 316                         if ((iflags & (ITEM_TRANSFER|ITEM_LOCAL_CHANGE) && !keep_time)
 317                             || (keep_time && file->modtime != st->st_mtime))
 318                                 iflags |= ITEM_REPORT_TIME;
 319                         if (preserve_perms && file->mode != st->st_mode)
 320                                 iflags |= ITEM_REPORT_PERMS;
 321                         if (preserve_uid && am_root && file->uid != st->st_uid)
 322                                 iflags |= ITEM_REPORT_OWNER;
 323                         if (preserve_gid && file->gid != GID_NONE
 324                             && st->st_gid != file->gid)
 325                                 iflags |= ITEM_REPORT_GROUP;
 326                 }
 327         } else {
 328                 iflags |= ITEM_IS_NEW;
 329                 if (!(iflags & (ITEM_HARD_LINKED|ITEM_LOCAL_CHANGE)))
 330                         iflags |= ITEM_TRANSFER;
 331         }
 332
 333         iflags &= 0xffff;
 334         if ((iflags & SIGNIFICANT_ITEM_FLAGS || verbose > 1
 335           || (hlink && *hlink)) && !read_batch) {
 336                 if (protocol_version >= 29) {
 337                         if (ndx >= 0)
 338                                 write_int(sock_f_out, ndx);
 339                         write_shortint(sock_f_out, iflags);
 340                         if (hlink)
 341                                 write_vstring(sock_f_out, hlink, strlen(hlink));
 342                 } else if (ndx >= 0)
 343                         log_item(file, &stats, iflags, hlink);
 344         }
 345 }
 346
 347
 348 /* Perform our quick-check heuristic for determining if a file is unchanged. */
 349 static int unchanged_file(char *fn, struct file_struct *file, STRUCT_STAT *st)
 350 {
 351         if (st->st_size != file->length)
 352                 return 0;
 353
 354         /* if always checksum is set then we use the checksum instead
 355            of the file time to determine whether to sync */
 356         if (always_checksum && S_ISREG(st->st_mode)) {
 357                 char sum[MD4_SUM_LENGTH];
 358                 file_checksum(fn, sum, st->st_size);
 359                 return memcmp(sum, file->u.sum, protocol_version < 21 ? 2
 360                                                         : MD4_SUM_LENGTH) == 0;
 361         }
 362
 363         if (size_only)
 364                 return 1;
 365
 366         if (ignore_times)
 367                 return 0;
 368
 369         return cmp_modtime(st->st_mtime, file->modtime) == 0;
 370 }
 371
 372
 373 /*
 374  * set (initialize) the size entries in the per-file sum_struct
 375  * calculating dynamic block and checksum sizes.
 376  *
 377  * This is only called from generate_and_send_sums() but is a separate
 378  * function to encapsulate the logic.
 379  *
 380  * The block size is a rounded square root of file length.
 381  *
 382  * The checksum size is determined according to:
 383  *     blocksum_bits = BLOCKSUM_EXP + 2*log2(file_len) - log2(block_len)
 384  * provided by Donovan Baarda which gives a probability of rsync
 385  * algorithm corrupting data and falling back using the whole md4
 386  * checksums.
 387  *
 388  * This might be made one of several selectable heuristics.
 389  */
 390 static void sum_sizes_sqroot(struct sum_struct *sum, int64 len)
 391 {
 392         int32 blength;
 393         int s2length;
 394
 395         if (block_size)
 396                 blength = block_size;
 397         else if (len <= BLOCK_SIZE * BLOCK_SIZE)
 398                 blength = BLOCK_SIZE;
 399         else {
 400                 int32 c;
 401                 int64 l;
 402                 int cnt;
 403                 for (c = 1, l = len, cnt = 0; l >>= 2; c <<= 1, cnt++) {}
 404                 if (cnt >= 31 || c >= MAX_BLOCK_SIZE)
 405                         blength = MAX_BLOCK_SIZE;
 406                 else {
 407                     blength = 0;
 408                     do {
 409                             blength |= c;
 410                             if (len < (int64)blength * blength)
 411                                     blength &= ~c;
 412                             c >>= 1;
 413                     } while (c >= 8);   /* round to multiple of 8 */
 414                     blength = MAX(blength, BLOCK_SIZE);
 415                 }
 416         }
 417
 418         if (protocol_version < 27) {
 419                 s2length = csum_length;
 420         } else if (csum_length == SUM_LENGTH) {
 421                 s2length = SUM_LENGTH;
 422         } else {
 423                 int32 c;
 424                 int64 l;
 425                 int b = BLOCKSUM_BIAS;
 426                 for (l = len; l >>= 1; b += 2) {}
 427                 for (c = blength; c >>= 1 && b; b--) {}
 428                 /* add a bit, subtract rollsum, round up. */
 429                 s2length = (b + 1 - 32 + 7) / 8; /* --optimize in compiler-- */
 430                 s2length = MAX(s2length, csum_length);
 431                 s2length = MIN(s2length, SUM_LENGTH);
 432         }
 433
 434         sum->flength    = len;
 435         sum->blength    = blength;
 436         sum->s2length   = s2length;
 437         sum->count      = (len + (blength - 1)) / blength;
 438         sum->remainder  = (len % blength);
 439
 440         if (sum->count && verbose > 2) {
 441                 rprintf(FINFO,
 442                         "count=%.0f rem=%ld blength=%ld s2length=%d flength=%.0f\n",
 443                         (double)sum->count, (long)sum->remainder, (long)sum->blength,
 444                         sum->s2length, (double)sum->flength);
 445         }
 446 }
 447
 448
 449 /*
 450  * Generate and send a stream of signatures/checksums that describe a buffer
 451  *
 452  * Generate approximately one checksum every block_len bytes.
 453  */
 454 static void generate_and_send_sums(int fd, OFF_T len, int f_out, int f_copy)
 455 {
 456         int32 i;
 457         struct map_struct *mapbuf;
 458         struct sum_struct sum;
 459         OFF_T offset = 0;
 460
 461         sum_sizes_sqroot(&sum, len);
 462
 463         if (len > 0)
 464                 mapbuf = map_file(fd, len, MAX_MAP_SIZE, sum.blength);
 465         else
 466                 mapbuf = NULL;
 467
 468         write_sum_head(f_out, &sum);
 469
 470         for (i = 0; i < sum.count; i++) {
 471                 int32 n1 = (int32)MIN(len, (OFF_T)sum.blength);
 472                 char *map = map_ptr(mapbuf, offset, n1);
 473                 uint32 sum1 = get_checksum1(map, n1);
 474                 char sum2[SUM_LENGTH];
 475
 476                 if (f_copy >= 0)
 477                         full_write(f_copy, map, n1);
 478
 479                 get_checksum2(map, n1, sum2);
 480
 481                 if (verbose > 3) {
 482                         rprintf(FINFO,
 483                                 "chunk[%.0f] offset=%.0f len=%ld sum1=%08lx\n",
 484                                 (double)i, (double)offset, (long)n1,
 485                                 (unsigned long)sum1);
 486                 }
 487                 write_int(f_out, sum1);
 488                 write_buf(f_out, sum2, sum.s2length);
 489                 len -= n1;
 490                 offset += n1;
 491         }
 492
 493         if (mapbuf)
 494                 unmap_file(mapbuf);
 495 }
 496
 497
 498 /* Try to find a filename in the same dir as "fname" with a similar name. */
 499 static int find_fuzzy(struct file_struct *file, struct file_list *dirlist)
 500 {
 501         int fname_len, fname_suf_len;
 502         const char *fname_suf, *fname = file->basename;
 503         uint32 lowest_dist = 0x7FFFFFFF;
 504         int j, lowest_j = -1;
 505
 506         fname_len = strlen(fname);
 507         fname_suf = find_filename_suffix(fname, fname_len, &fname_suf_len);
 508
 509         for (j = 0; j < dirlist->count; j++) {
 510                 struct file_struct *fp = dirlist->files[j];
 511                 const char *suf, *name;
 512                 int len, suf_len;
 513                 uint32 dist;
 514
 515                 if (!S_ISREG(fp->mode) || !fp->length
 516                     || fp->flags & FLAG_NO_FUZZY)
 517                         continue;
 518
 519                 name = fp->basename;
 520
 521                 if (fp->length == file->length
 522                     && fp->modtime == file->modtime) {
 523                         if (verbose > 4) {
 524                                 rprintf(FINFO,
 525                                         "fuzzy size/modtime match for %s\n",
 526                                         name);
 527                         }
 528                         return j;
 529                 }
 530
 531                 len = strlen(name);
 532                 suf = find_filename_suffix(name, len, &suf_len);
 533
 534                 dist = fuzzy_distance(name, len, fname, fname_len);
 535                 /* Add some extra weight to how well the suffixes match. */
 536                 dist += fuzzy_distance(suf, suf_len, fname_suf, fname_suf_len)
 537                       * 10;
 538                 if (verbose > 4) {
 539                         rprintf(FINFO, "fuzzy distance for %s = %d.%05d\n",
 540                                 name, (int)(dist>>16), (int)(dist&0xFFFF));
 541                 }
 542                 if (dist <= lowest_dist) {
 543                         lowest_dist = dist;
 544                         lowest_j = j;
 545                 }
 546         }
 547
 548         return lowest_j;
 549 }
 550
 551 void check_for_finished_hlinks(int itemizing, enum logcode code)
 552 {
 553         struct file_struct *file;
 554         int ndx;
 555
 556         while ((ndx = get_hlink_num()) != -1) {
 557                 if (ndx < 0 || ndx >= the_file_list->count)
 558                         continue;
 559
 560                 file = the_file_list->files[ndx];
 561                 if (!file->link_u.links)
 562                         continue;
 563
 564                 hard_link_cluster(file, ndx, itemizing, code);
 565         }
 566 }
 567
 568 /* Acts on the_file_list->file's ndx'th item, whose name is fname.  If a dir,
 569  * make sure it exists, and has the right permissions/timestamp info.  For
 570  * all other non-regular files (symlinks, etc.) we create them here.  For
 571  * regular files that have changed, we try to find a basis file and then
 572  * start sending checksums.
 573  *
 574  * Note that f_out is set to -1 when doing final directory-permission and
 575  * modification-time repair. */
 576 static void recv_generator(char *fname, struct file_struct *file, int ndx,
 577                            int itemizing, int maybe_PERMS_REPORT,
 578                            enum logcode code, int f_out, int f_out_name)
 579 {
 580         static int missing_below = -1, excluded_below = -1;
 581         static char *fuzzy_dirname = NULL;
 582         static struct file_list *fuzzy_dirlist = NULL;
 583         struct file_struct *fuzzy_file = NULL;
 584         int fd = -1, f_copy = -1;
 585         STRUCT_STAT st, partial_st;
 586         struct file_struct *back_file = NULL;
 587         int statret, stat_errno;
 588         char *fnamecmp, *partialptr, *backupptr = NULL;
 589         char fnamecmpbuf[MAXPATHLEN];
 590         uchar fnamecmp_type;
 591
 592         if (list_only)
 593                 return;
 594
 595         if (!fname) {
 596                 if (fuzzy_dirlist) {
 597                         flist_free(fuzzy_dirlist);
 598                         fuzzy_dirlist = NULL;
 599                         fuzzy_dirname = NULL;
 600                 }
 601                 if (missing_below >= 0) {
 602                         dry_run--;
 603                         missing_below = -1;
 604                 }
 605                 return;
 606         }
 607
 608         if (verbose > 2) {
 609                 rprintf(FINFO, "recv_generator(%s,%d)\n",
 610                         safe_fname(fname), ndx);
 611         }
 612
 613         if (server_filter_list.head) {
 614                 if (excluded_below >= 0) {
 615                         if (file->dir.depth > excluded_below)
 616                                 goto skipping;
 617                         excluded_below = -1;
 618                 }
 619                 if (check_filter(&server_filter_list, fname,
 620                                  S_ISDIR(file->mode)) < 0) {
 621                         if (S_ISDIR(file->mode))
 622                                 excluded_below = file->dir.depth;
 623                     skipping:
 624                         if (verbose) {
 625                                 rprintf(FINFO,
 626                                         "skipping server-excluded file \"%s\"\n",
 627                                         safe_fname(fname));
 628                         }
 629                         return;
 630                 }
 631         }
 632
 633         if (missing_below >= 0 && file->dir.depth <= missing_below) {
 634                 dry_run--;
 635                 missing_below = -1;
 636         }
 637         if (dry_run > 1) {
 638                 statret = -1;
 639                 stat_errno = ENOENT;
 640         } else {
 641                 if (fuzzy_basis && S_ISREG(file->mode)) {
 642                         char *dn = file->dirname ? file->dirname : ".";
 643                         /* Yes, identical dirnames are guaranteed to have
 644                          * identical pointers at this point. */
 645                         if (fuzzy_dirname != dn) {
 646                                 if (fuzzy_dirlist)
 647                                         flist_free(fuzzy_dirlist);
 648                                 fuzzy_dirname = dn;
 649                                 fuzzy_dirlist = get_dirlist(fuzzy_dirname, -1,
 650                                                             1);
 651                         }
 652                 }
 653
 654                 statret = link_stat(fname, &st,
 655                                     keep_dirlinks && S_ISDIR(file->mode));
 656                 stat_errno = errno;
 657         }
 658
 659         if (only_existing && statret == -1 && stat_errno == ENOENT) {
 660                 /* we only want to update existing files */
 661                 if (verbose > 1) {
 662                         rprintf(FINFO, "not creating new file \"%s\"\n",
 663                                 safe_fname(fname));
 664                 }
 665                 return;
 666         }
 667
 668         if (statret == 0 && !preserve_perms
 669             && S_ISDIR(st.st_mode) == S_ISDIR(file->mode)) {
 670                 /* if the file exists already and we aren't perserving
 671                  * permissions then act as though the remote end sent
 672                  * us the file permissions we already have */
 673                 file->mode = (file->mode & ~CHMOD_BITS)
 674                            | (st.st_mode & CHMOD_BITS);
 675         }
 676
 677         if (S_ISDIR(file->mode)) {
 678                 /* The file to be received is a directory, so we need
 679                  * to prepare appropriately.  If there is already a
 680                  * file of that name and it is *not* a directory, then
 681                  * we need to delete it.  If it doesn't exist, then
 682                  * (perhaps recursively) create it. */
 683                 if (statret == 0 && !S_ISDIR(st.st_mode)) {
 684                         delete_item(fname, st.st_mode, DEL_TERSE);
 685                         statret = -1;
 686                 }
 687                 if (dry_run && statret != 0 && missing_below < 0) {
 688                         missing_below = file->dir.depth;
 689                         dry_run++;
 690                 }
 691                 if (itemizing && f_out != -1) {
 692                         itemize(file, ndx, statret, &st,
 693                                 statret ? ITEM_LOCAL_CHANGE : 0, NULL);
 694                 }
 695                 if (statret != 0 && do_mkdir(fname,file->mode) != 0 && errno != EEXIST) {
 696                         if (!relative_paths || errno != ENOENT
 697                             || create_directory_path(fname, orig_umask) < 0
 698                             || do_mkdir(fname, file->mode) < 0) {
 699                                 rsyserr(FERROR, errno,
 700                                         "recv_generator: mkdir %s failed",
 701                                         full_fname(fname));
 702                         }
 703                 }
 704                 if (set_perms(fname, file, statret ? NULL : &st, 0)
 705                     && verbose && code && f_out != -1)
 706                         rprintf(code, "%s/\n", safe_fname(fname));
 707                 if (delete_during && f_out != -1 && csum_length != SUM_LENGTH
 708                     && (file->flags & FLAG_DEL_HERE))
 709                         delete_in_dir(the_file_list, fname, file);
 710                 return;
 711         }
 712
 713         if (max_size && file->length > max_size) {
 714                 if (verbose > 1) {
 715                         rprintf(FINFO, "%s is over max-size\n",
 716                                 safe_fname(fname));
 717                 }
 718                 return;
 719         }
 720
 721         if (preserve_links && S_ISLNK(file->mode)) {
 722 #ifdef SUPPORT_LINKS
 723                 if (safe_symlinks && unsafe_symlink(file->u.link, fname)) {
 724                         if (verbose) {
 725                                 rprintf(FINFO,
 726                                         "ignoring unsafe symlink %s -> \"%s\"\n",
 727                                         full_fname(fname),
 728                                         safe_fname(file->u.link));
 729                         }
 730                         return;
 731                 }
 732                 if (statret == 0) {
 733                         char lnk[MAXPATHLEN];
 734                         int len;
 735
 736                         if (!S_ISDIR(st.st_mode)
 737                             && (len = readlink(fname, lnk, MAXPATHLEN-1)) > 0) {
 738                                 lnk[len] = 0;
 739                                 /* A link already pointing to the
 740                                  * right place -- no further action
 741                                  * required. */
 742                                 if (strcmp(lnk, file->u.link) == 0) {
 743                                         if (itemizing) {
 744                                                 itemize(file, ndx, 0, &st, 0,
 745                                                         NULL);
 746                                         }
 747                                         set_perms(fname, file, &st,
 748                                                   maybe_PERMS_REPORT);
 749                                         return;
 750                                 }
 751                         }
 752                         /* Not the right symlink (or not a symlink), so
 753                          * delete it. */
 754                         if (S_ISLNK(st.st_mode))
 755                                 delete_item(fname, st.st_mode, DEL_TERSE);
 756                         else {
 757                                 delete_item(fname, st.st_mode, DEL_TERSE);
 758                                 statret = -1;
 759                         }
 760                 }
 761                 if (do_symlink(file->u.link,fname) != 0) {
 762                         rsyserr(FERROR, errno, "symlink %s -> \"%s\" failed",
 763                                 full_fname(fname), safe_fname(file->u.link));
 764                 } else {
 765                         set_perms(fname,file,NULL,0);
 766                         if (itemizing) {
 767                                 itemize(file, ndx, statret, &st,
 768                                         ITEM_LOCAL_CHANGE, NULL);
 769                         }
 770                         if (code && verbose) {
 771                                 rprintf(code, "%s -> %s\n", safe_fname(fname),
 772                                         safe_fname(file->u.link));
 773                         }
 774                         if (remove_sent_files && !dry_run) {
 775                                 char numbuf[4];
 776                                 SIVAL(numbuf, 0, ndx);
 777                                 send_msg(MSG_SUCCESS, numbuf, 4);
 778                         }
 779                 }
 780 #endif
 781                 return;
 782         }
 783
 784         if (am_root && preserve_devices && IS_DEVICE(file->mode)) {
 785                 if (statret != 0 ||
 786                     st.st_mode != file->mode ||
 787                     st.st_rdev != file->u.rdev) {
 788                         delete_item(fname, st.st_mode, DEL_TERSE);
 789                         if (!IS_DEVICE(st.st_mode))
 790                                 statret = -1;
 791                         if (verbose > 2) {
 792                                 rprintf(FINFO,"mknod(%s,0%o,0x%x)\n",
 793                                         safe_fname(fname),
 794                                         (int)file->mode, (int)file->u.rdev);
 795                         }
 796                         if (do_mknod(fname,file->mode,file->u.rdev) != 0) {
 797                                 rsyserr(FERROR, errno, "mknod %s failed",
 798                                         full_fname(fname));
 799                         } else {
 800                                 set_perms(fname,file,NULL,0);
 801                                 if (itemizing) {
 802                                         itemize(file, ndx, statret, &st,
 803                                                 ITEM_LOCAL_CHANGE, NULL);
 804                                 }
 805                                 if (code && verbose) {
 806                                         rprintf(code, "%s\n",
 807                                                 safe_fname(fname));
 808                                 }
 809                         }
 810                 } else {
 811                         if (itemizing)
 812                                 itemize(file, ndx, statret, &st, 0, NULL);
 813                         set_perms(fname, file, &st, maybe_PERMS_REPORT);
 814                 }
 815                 return;
 816         }
 817
 818         if (preserve_hard_links && hard_link_check(file, ndx, HL_CHECK_MASTER))
 819                 return;
 820
 821         if (!S_ISREG(file->mode)) {
 822                 rprintf(FINFO, "skipping non-regular file \"%s\"\n",
 823                         safe_fname(fname));
 824                 return;
 825         }
 826
 827         if (opt_ignore_existing && statret == 0) {
 828                 if (verbose > 1)
 829                         rprintf(FINFO, "%s exists\n", safe_fname(fname));
 830                 return;
 831         }
 832
 833         if (update_only && statret == 0
 834             && cmp_modtime(st.st_mtime, file->modtime) > 0) {
 835                 if (verbose > 1)
 836                         rprintf(FINFO, "%s is newer\n", safe_fname(fname));
 837                 return;
 838         }
 839
 840         fnamecmp = fname;
 841         fnamecmp_type = FNAMECMP_FNAME;
 842
 843         if (statret != 0 && basis_dir[0] != NULL) {
 844                 int best_match = -1;
 845                 int match_level = 0;
 846                 int i = 0;
 847                 do {
 848                         pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 849                                  basis_dir[i], fname);
 850                         if (link_stat(fnamecmpbuf, &st, 0) < 0
 851                             || !S_ISREG(st.st_mode))
 852                                 continue;
 853                         switch (match_level) {
 854                         case 0:
 855                                 best_match = i;
 856                                 match_level = 1;
 857                                 /* FALL THROUGH */
 858                         case 1:
 859                                 if (!unchanged_file(fnamecmpbuf, file, &st))
 860                                         continue;
 861                                 best_match = i;
 862                                 match_level = 2;
 863                                 /* FALL THROUGH */
 864                         case 2:
 865                                 if (!unchanged_attrs(file, &st))
 866                                         continue;
 867                                 best_match = i;
 868                                 match_level = 3;
 869                                 break;
 870                         }
 871                         break;
 872                 } while (basis_dir[++i] != NULL);
 873                 if (match_level) {
 874                         statret = 0;
 875                         if (i != best_match) {
 876                                 i = best_match;
 877                                 pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 878                                          basis_dir[i], fname);
 879                                 if (link_stat(fnamecmpbuf, &st, 0) < 0) {
 880                                         match_level = 0;
 881                                         statret = -1;
 882                                         stat_errno = errno;
 883                                 }
 884                         }
 885 #ifdef HAVE_LINK
 886                         if (link_dest && match_level == 3) {
 887                                 if (hard_link_one(file, ndx, fname, -1, &st,
 888                                                   fnamecmpbuf, 1,
 889                                                   itemizing && verbose > 1,
 890                                                   code) == 0)
 891                                         return;
 892                                 if (verbose) {
 893                                         rsyserr(FINFO, errno, "link %s => %s",
 894                                                 full_fname(fnamecmpbuf),
 895                                                 safe_fname(fname));
 896                                 }
 897                                 match_level = 2;
 898                         }
 899 #endif
 900                         if (compare_dest || (match_level && match_level < 3)) {
 901                                 fnamecmp = fnamecmpbuf;
 902                                 fnamecmp_type = i;
 903                         }
 904                 }
 905         }
 906
 907         if (statret == 0 && !S_ISREG(st.st_mode)) {
 908                 if (delete_item(fname, st.st_mode, DEL_TERSE) != 0)
 909                         return;
 910                 statret = -1;
 911                 stat_errno = ENOENT;
 912         }
 913
 914         if (partial_dir && (partialptr = partial_dir_fname(fname)) != NULL
 915             && link_stat(partialptr, &partial_st, 0) == 0
 916             && S_ISREG(partial_st.st_mode)) {
 917                 if (statret != 0)
 918                         goto prepare_to_open;
 919         } else
 920                 partialptr = NULL;
 921
 922         if (statret != 0 && fuzzy_basis && dry_run <= 1) {
 923                 int j = find_fuzzy(file, fuzzy_dirlist);
 924                 if (j >= 0) {
 925                         fuzzy_file = fuzzy_dirlist->files[j];
 926                         f_name_to(fuzzy_file, fnamecmpbuf);
 927                         if (verbose > 2) {
 928                                 rprintf(FINFO, "fuzzy basis selected for %s: %s\n",
 929                                         safe_fname(fname), safe_fname(fnamecmpbuf));
 930                         }
 931                         st.st_mode = fuzzy_file->mode;
 932                         st.st_size = fuzzy_file->length;
 933                         st.st_mtime = fuzzy_file->modtime;
 934                         statret = 0;
 935                         fnamecmp = fnamecmpbuf;
 936                         fnamecmp_type = FNAMECMP_FUZZY;
 937                 }
 938         }
 939
 940         if (statret != 0) {
 941                 if (preserve_hard_links && hard_link_check(file, ndx, HL_SKIP))
 942                         return;
 943                 if (stat_errno == ENOENT)
 944                         goto notify_others;
 945                 if (verbose > 1) {
 946                         rsyserr(FERROR, stat_errno,
 947                                 "recv_generator: failed to stat %s",
 948                                 full_fname(fname));
 949                 }
 950                 return;
 951         }
 952
 953         if (!compare_dest && fnamecmp_type <= FNAMECMP_BASIS_DIR_HIGH)
 954                 ;
 955         else if (fnamecmp_type == FNAMECMP_FUZZY)
 956                 ;
 957         else if (unchanged_file(fnamecmp, file, &st)) {
 958                 if (fnamecmp_type == FNAMECMP_FNAME) {
 959                         if (itemizing)
 960                                 itemize(file, ndx, statret, &st, 0, NULL);
 961                         set_perms(fname, file, &st, maybe_PERMS_REPORT);
 962                         if (preserve_hard_links && file->link_u.links)
 963                                 hard_link_cluster(file, ndx, itemizing, code);
 964                         return;
 965                 }
 966                 /* Only --compare-dest gets here. */
 967                 if (unchanged_attrs(file, &st)) {
 968                         itemize(file, ndx, statret, &st,
 969                                 ITEM_NO_DEST_AND_NO_UPDATE, NULL);
 970                         return;
 971                 }
 972         }
 973
 974 prepare_to_open:
 975         if (partialptr) {
 976                 st = partial_st;
 977                 fnamecmp = partialptr;
 978                 fnamecmp_type = FNAMECMP_PARTIAL_DIR;
 979                 statret = 0;
 980         }
 981
 982         if (dry_run || read_batch || whole_file)
 983                 goto notify_others;
 984
 985         if (fuzzy_basis) {
 986                 int j = flist_find(fuzzy_dirlist, file);
 987                 if (j >= 0) /* don't use changing file as future fuzzy basis */
 988                         fuzzy_dirlist->files[j]->flags |= FLAG_NO_FUZZY;
 989         }
 990
 991         /* open the file */
 992         fd = do_open(fnamecmp, O_RDONLY, 0);
 993
 994         if (fd == -1) {
 995                 rsyserr(FERROR, errno, "failed to open %s, continuing",
 996                         full_fname(fnamecmp));
 997             pretend_missing:
 998                 /* pretend the file didn't exist */
 999                 if (preserve_hard_links && hard_link_check(file, ndx, HL_SKIP))
1000                         return;
1001                 statret = -1;
1002                 goto notify_others;
1003         }
1004
1005         if (inplace && make_backups) {
1006                 if (!(backupptr = get_backup_name(fname))) {
1007                         close(fd);
1008                         return;
1009                 }
1010                 if (!(back_file = make_file(fname, NULL, NO_FILTERS))) {
1011                         close(fd);
1012                         goto pretend_missing;
1013                 }
1014                 if (robust_unlink(backupptr) && errno != ENOENT) {
1015                         rsyserr(FERROR, errno, "unlink %s",
1016                                 full_fname(backupptr));
1017                         free(back_file);
1018                         close(fd);
1019                         return;
1020                 }
1021                 if ((f_copy = do_open(backupptr,
1022                     O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0600)) < 0) {
1023                         rsyserr(FERROR, errno, "open %s",
1024                                 full_fname(backupptr));
1025                         free(back_file);
1026                         close(fd);
1027                         return;
1028                 }
1029                 fnamecmp_type = FNAMECMP_BACKUP;
1030         }
1031
1032         if (verbose > 3) {
1033                 rprintf(FINFO, "gen mapped %s of size %.0f\n",
1034                         safe_fname(fnamecmp), (double)st.st_size);
1035         }
1036
1037         if (verbose > 2)
1038                 rprintf(FINFO, "generating and sending sums for %d\n", ndx);
1039
1040 notify_others:
1041         write_int(f_out, ndx);
1042         if (itemizing) {
1043                 int iflags = ITEM_TRANSFER;
1044                 if (always_checksum)
1045                         iflags |= ITEM_REPORT_CHECKSUM;
1046                 if (fnamecmp_type != FNAMECMP_FNAME)
1047                         iflags |= ITEM_USING_ALT_BASIS;
1048                 itemize(file, -1, statret, &st, iflags, NULL);
1049         }
1050         if (f_out_name >= 0) {
1051                 write_byte(f_out_name, fnamecmp_type);
1052                 if (fnamecmp_type == FNAMECMP_FUZZY) {
1053                         write_vstring(f_out_name, fuzzy_file->basename,
1054                                       strlen(fuzzy_file->basename));
1055                 }
1056         }
1057
1058         if (dry_run) {
1059                 if (preserve_hard_links && file->link_u.links)
1060                         hard_link_cluster(file, ndx, itemizing, code);
1061                 return;
1062         }
1063         if (read_batch)
1064                 return;
1065
1066         if (statret != 0 || whole_file) {
1067                 write_sum_head(f_out, NULL);
1068                 return;
1069         }
1070
1071         generate_and_send_sums(fd, st.st_size, f_out, f_copy);
1072
1073         if (f_copy >= 0) {
1074                 close(f_copy);
1075                 set_perms(backupptr, back_file, NULL, 0);
1076                 if (verbose > 1) {
1077                         rprintf(FINFO, "backed up %s to %s\n",
1078                                 safe_fname(fname), safe_fname(backupptr));
1079                 }
1080                 free(back_file);
1081         }
1082
1083         close(fd);
1084 }
1085
1086
1087 void generate_files(int f_out, struct file_list *flist, char *local_name,
1088                     int f_out_name)
1089 {
1090         int i, lull_mod;
1091         int phase = 0;
1092         char fbuf[MAXPATHLEN];
1093         int itemizing, maybe_PERMS_REPORT;
1094         enum logcode code;
1095         int need_retouch_dir_times = preserve_times && !omit_dir_times;
1096         int need_retouch_dir_perms = 0;
1097         int save_only_existing = only_existing;
1098         int save_opt_ignore_existing = opt_ignore_existing;
1099
1100         allowed_lull = read_batch ? 0 : (io_timeout + 1) / 2;
1101         lull_mod = allowed_lull * 5;
1102
1103         if (protocol_version >= 29) {
1104                 itemizing = 1;
1105                 maybe_PERMS_REPORT = log_format_has_i ? 0 : PERMS_REPORT;
1106                 code = daemon_log_format_has_i ? 0 : FLOG;
1107         } else if (am_daemon) {
1108                 itemizing = daemon_log_format_has_i && !dry_run;
1109                 maybe_PERMS_REPORT = PERMS_REPORT;
1110                 code = itemizing || dry_run ? FCLIENT : FINFO;
1111         } else if (!am_server) {
1112                 itemizing = log_format_has_i;
1113                 maybe_PERMS_REPORT = log_format_has_i ? 0 : PERMS_REPORT;
1114                 code = itemizing ? 0 : FINFO;
1115         } else {
1116                 itemizing = 0;
1117                 maybe_PERMS_REPORT = PERMS_REPORT;
1118                 code = FINFO;
1119         }
1120
1121         if (verbose > 2) {
1122                 rprintf(FINFO, "generator starting pid=%ld count=%d\n",
1123                         (long)getpid(), flist->count);
1124         }
1125
1126         if (delete_before && !local_name && flist->count > 0)
1127                 do_delete_pass(flist);
1128
1129         if (whole_file < 0)
1130                 whole_file = 0;
1131         if (verbose >= 2) {
1132                 rprintf(FINFO, "delta-transmission %s\n",
1133                         whole_file
1134                         ? "disabled for local transfer or --whole-file"
1135                         : "enabled");
1136         }
1137
1138         if (protocol_version < 29)
1139                 ignore_timeout = 1;
1140
1141         for (i = 0; i < flist->count; i++) {
1142                 struct file_struct *file = flist->files[i];
1143                 struct file_struct copy;
1144
1145                 if (!file->basename)
1146                         continue;
1147
1148                 /* We need to ensure that any dirs we create have writeable
1149                  * permissions during the time we are putting files within
1150                  * them.  This is then fixed after the transfer is done. */
1151                 if (!am_root && S_ISDIR(file->mode) && !(file->mode & S_IWUSR)) {
1152                         copy = *file;
1153                         copy.mode |= S_IWUSR; /* user write */
1154                         file = &copy;
1155                         need_retouch_dir_perms = 1;
1156                 }
1157
1158                 recv_generator(local_name ? local_name : f_name_to(file, fbuf),
1159                                file, i, itemizing, maybe_PERMS_REPORT, code,
1160                                f_out, f_out_name);
1161                 if (preserve_hard_links)
1162                         check_for_finished_hlinks(itemizing, code);
1163
1164                 if (allowed_lull && !(i % lull_mod))
1165                         maybe_send_keepalive();
1166         }
1167         recv_generator(NULL, NULL, 0, 0, 0, code, -1, -1);
1168         if (delete_during)
1169                 delete_in_dir(NULL, NULL, NULL);
1170
1171         phase++;
1172         csum_length = SUM_LENGTH;
1173         only_existing = max_size = opt_ignore_existing = 0;
1174         update_only = always_checksum = size_only = 0;
1175         ignore_times = 1;
1176         make_backups = 0; /* avoid a duplicate backup for inplace processing */
1177
1178         /* We expect to just sit around now, so don't exit on a timeout.
1179          * If we really get a timeout then the other process should exit. */
1180         ignore_timeout = 1;
1181
1182         if (verbose > 2)
1183                 rprintf(FINFO,"generate_files phase=%d\n",phase);
1184
1185         write_int(f_out, -1);
1186
1187         /* files can cycle through the system more than once
1188          * to catch initial checksum errors */
1189         while ((i = get_redo_num(itemizing, code)) != -1) {
1190                 struct file_struct *file = flist->files[i];
1191                 recv_generator(local_name ? local_name : f_name_to(file, fbuf),
1192                                file, i, itemizing, maybe_PERMS_REPORT, code,
1193                                f_out, f_out_name);
1194         }
1195
1196         phase++;
1197         only_existing = save_only_existing;
1198         opt_ignore_existing = save_opt_ignore_existing;
1199
1200         if (verbose > 2)
1201                 rprintf(FINFO,"generate_files phase=%d\n",phase);
1202
1203         write_int(f_out, -1);
1204
1205         /* Read post-redo-phase MSG_DONE and any prior messages. */
1206         get_redo_num(itemizing, code);
1207
1208         if (delete_after && !local_name && flist->count > 0)
1209                 do_delete_pass(flist);
1210
1211         if ((need_retouch_dir_perms || need_retouch_dir_times)
1212             && !list_only && !local_name && !dry_run) {
1213                 int j = 0;
1214                 /* Now we need to fix any directory permissions that were
1215                  * modified during the transfer and/or re-set any tweaked
1216                  * modified-time values. */
1217                 for (i = 0; i < flist->count; i++) {
1218                         struct file_struct *file = flist->files[i];
1219                         if (!file->basename || !S_ISDIR(file->mode))
1220                                 continue;
1221                         if (!need_retouch_dir_times && file->mode & S_IWUSR)
1222                                 continue;
1223                         recv_generator(local_name ? local_name : f_name(file),
1224                                        file, i, itemizing, maybe_PERMS_REPORT,
1225                                        code, -1, -1);
1226                         if (allowed_lull && !(j++ % lull_mod))
1227                                 maybe_send_keepalive();
1228                 }
1229         }
1230         recv_generator(NULL, NULL, 0, 0, 0, code, -1, -1);
1231
1232         if (verbose > 2)
1233                 rprintf(FINFO,"generate_files finished\n");
1234 }