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