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, uchar fnamecmp_type, char *xname)
 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
 335         iflags &= 0xffff;
 336         if ((iflags & SIGNIFICANT_ITEM_FLAGS || verbose > 1
 337           || (xname && *xname)) && !read_batch) {
 338                 if (protocol_version >= 29) {
 339                         if (ndx >= 0)
 340                                 write_int(sock_f_out, ndx);
 341                         write_shortint(sock_f_out, iflags);
 342                         if (iflags & ITEM_BASIS_TYPE_FOLLOWS)
 343                                 write_byte(sock_f_out, fnamecmp_type);
 344                         if (iflags & ITEM_XNAME_FOLLOWS)
 345                                 write_vstring(sock_f_out, xname, strlen(xname));
 346                 } else if (ndx >= 0)
 347                         log_item(file, &stats, iflags, xname);
 348         }
 349 }
 350
 351
 352 /* Perform our quick-check heuristic for determining if a file is unchanged. */
 353 static int unchanged_file(char *fn, struct file_struct *file, STRUCT_STAT *st)
 354 {
 355         if (st->st_size != file->length)
 356                 return 0;
 357
 358         /* if always checksum is set then we use the checksum instead
 359            of the file time to determine whether to sync */
 360         if (always_checksum && S_ISREG(st->st_mode)) {
 361                 char sum[MD4_SUM_LENGTH];
 362                 file_checksum(fn, sum, st->st_size);
 363                 return memcmp(sum, file->u.sum, protocol_version < 21 ? 2
 364                                                         : MD4_SUM_LENGTH) == 0;
 365         }
 366
 367         if (size_only)
 368                 return 1;
 369
 370         if (ignore_times)
 371                 return 0;
 372
 373         return cmp_modtime(st->st_mtime, file->modtime) == 0;
 374 }
 375
 376
 377 /*
 378  * set (initialize) the size entries in the per-file sum_struct
 379  * calculating dynamic block and checksum sizes.
 380  *
 381  * This is only called from generate_and_send_sums() but is a separate
 382  * function to encapsulate the logic.
 383  *
 384  * The block size is a rounded square root of file length.
 385  *
 386  * The checksum size is determined according to:
 387  *     blocksum_bits = BLOCKSUM_BIAS + 2*log2(file_len) - log2(block_len)
 388  * provided by Donovan Baarda which gives a probability of rsync
 389  * algorithm corrupting data and falling back using the whole md4
 390  * checksums.
 391  *
 392  * This might be made one of several selectable heuristics.
 393  */
 394 static void sum_sizes_sqroot(struct sum_struct *sum, int64 len)
 395 {
 396         int32 blength;
 397         int s2length;
 398
 399         if (block_size)
 400                 blength = block_size;
 401         else if (len <= BLOCK_SIZE * BLOCK_SIZE)
 402                 blength = BLOCK_SIZE;
 403         else {
 404                 int32 c;
 405                 int64 l;
 406                 int cnt;
 407                 for (c = 1, l = len, cnt = 0; l >>= 2; c <<= 1, cnt++) {}
 408                 if (cnt >= 31 || c >= MAX_BLOCK_SIZE)
 409                         blength = MAX_BLOCK_SIZE;
 410                 else {
 411                     blength = 0;
 412                     do {
 413                             blength |= c;
 414                             if (len < (int64)blength * blength)
 415                                     blength &= ~c;
 416                             c >>= 1;
 417                     } while (c >= 8);   /* round to multiple of 8 */
 418                     blength = MAX(blength, BLOCK_SIZE);
 419                 }
 420         }
 421
 422         if (protocol_version < 27) {
 423                 s2length = csum_length;
 424         } else if (csum_length == SUM_LENGTH) {
 425                 s2length = SUM_LENGTH;
 426         } else {
 427                 int32 c;
 428                 int64 l;
 429                 int b = BLOCKSUM_BIAS;
 430                 for (l = len; l >>= 1; b += 2) {}
 431                 for (c = blength; c >>= 1 && b; b--) {}
 432                 /* add a bit, subtract rollsum, round up. */
 433                 s2length = (b + 1 - 32 + 7) / 8; /* --optimize in compiler-- */
 434                 s2length = MAX(s2length, csum_length);
 435                 s2length = MIN(s2length, SUM_LENGTH);
 436         }
 437
 438         sum->flength    = len;
 439         sum->blength    = blength;
 440         sum->s2length   = s2length;
 441         sum->count      = (len + (blength - 1)) / blength;
 442         sum->remainder  = (len % blength);
 443
 444         if (sum->count && verbose > 2) {
 445                 rprintf(FINFO,
 446                         "count=%.0f rem=%ld blength=%ld s2length=%d flength=%.0f\n",
 447                         (double)sum->count, (long)sum->remainder, (long)sum->blength,
 448                         sum->s2length, (double)sum->flength);
 449         }
 450 }
 451
 452
 453 /*
 454  * Generate and send a stream of signatures/checksums that describe a buffer
 455  *
 456  * Generate approximately one checksum every block_len bytes.
 457  */
 458 static void generate_and_send_sums(int fd, OFF_T len, int f_out, int f_copy)
 459 {
 460         int32 i;
 461         struct map_struct *mapbuf;
 462         struct sum_struct sum;
 463         OFF_T offset = 0;
 464
 465         sum_sizes_sqroot(&sum, len);
 466
 467         if (len > 0)
 468                 mapbuf = map_file(fd, len, MAX_MAP_SIZE, sum.blength);
 469         else
 470                 mapbuf = NULL;
 471
 472         write_sum_head(f_out, &sum);
 473
 474         for (i = 0; i < sum.count; i++) {
 475                 int32 n1 = (int32)MIN(len, (OFF_T)sum.blength);
 476                 char *map = map_ptr(mapbuf, offset, n1);
 477                 uint32 sum1 = get_checksum1(map, n1);
 478                 char sum2[SUM_LENGTH];
 479
 480                 if (f_copy >= 0)
 481                         full_write(f_copy, map, n1);
 482
 483                 get_checksum2(map, n1, sum2);
 484
 485                 if (verbose > 3) {
 486                         rprintf(FINFO,
 487                                 "chunk[%.0f] offset=%.0f len=%ld sum1=%08lx\n",
 488                                 (double)i, (double)offset, (long)n1,
 489                                 (unsigned long)sum1);
 490                 }
 491                 write_int(f_out, sum1);
 492                 write_buf(f_out, sum2, sum.s2length);
 493                 len -= n1;
 494                 offset += n1;
 495         }
 496
 497         if (mapbuf)
 498                 unmap_file(mapbuf);
 499 }
 500
 501
 502 /* Try to find a filename in the same dir as "fname" with a similar name. */
 503 static int find_fuzzy(struct file_struct *file, struct file_list *dirlist)
 504 {
 505         int fname_len, fname_suf_len;
 506         const char *fname_suf, *fname = file->basename;
 507         uint32 lowest_dist = 0x7FFFFFFF;
 508         int j, lowest_j = -1;
 509
 510         fname_len = strlen(fname);
 511         fname_suf = find_filename_suffix(fname, fname_len, &fname_suf_len);
 512
 513         for (j = 0; j < dirlist->count; j++) {
 514                 struct file_struct *fp = dirlist->files[j];
 515                 const char *suf, *name;
 516                 int len, suf_len;
 517                 uint32 dist;
 518
 519                 if (!S_ISREG(fp->mode) || !fp->length
 520                     || fp->flags & FLAG_NO_FUZZY)
 521                         continue;
 522
 523                 name = fp->basename;
 524
 525                 if (fp->length == file->length
 526                     && fp->modtime == file->modtime) {
 527                         if (verbose > 4) {
 528                                 rprintf(FINFO,
 529                                         "fuzzy size/modtime match for %s\n",
 530                                         name);
 531                         }
 532                         return j;
 533                 }
 534
 535                 len = strlen(name);
 536                 suf = find_filename_suffix(name, len, &suf_len);
 537
 538                 dist = fuzzy_distance(name, len, fname, fname_len);
 539                 /* Add some extra weight to how well the suffixes match. */
 540                 dist += fuzzy_distance(suf, suf_len, fname_suf, fname_suf_len)
 541                       * 10;
 542                 if (verbose > 4) {
 543                         rprintf(FINFO, "fuzzy distance for %s = %d.%05d\n",
 544                                 name, (int)(dist>>16), (int)(dist&0xFFFF));
 545                 }
 546                 if (dist <= lowest_dist) {
 547                         lowest_dist = dist;
 548                         lowest_j = j;
 549                 }
 550         }
 551
 552         return lowest_j;
 553 }
 554
 555 void check_for_finished_hlinks(int itemizing, enum logcode code)
 556 {
 557         struct file_struct *file;
 558         int ndx;
 559
 560         while ((ndx = get_hlink_num()) != -1) {
 561                 if (ndx < 0 || ndx >= the_file_list->count)
 562                         continue;
 563
 564                 file = the_file_list->files[ndx];
 565                 if (!file->link_u.links)
 566                         continue;
 567
 568                 hard_link_cluster(file, ndx, itemizing, code);
 569         }
 570 }
 571
 572 static int phase = 0;
 573
 574 /* Acts on the_file_list->file's ndx'th item, whose name is fname.  If a dir,
 575  * make sure it exists, and has the right permissions/timestamp info.  For
 576  * all other non-regular files (symlinks, etc.) we create them here.  For
 577  * regular files that have changed, we try to find a basis file and then
 578  * start sending checksums.
 579  *
 580  * Note that f_out is set to -1 when doing final directory-permission and
 581  * modification-time repair. */
 582 static void recv_generator(char *fname, struct file_struct *file, int ndx,
 583                            int itemizing, int maybe_PERMS_REPORT,
 584                            enum logcode code, int f_out)
 585 {
 586         static int missing_below = -1, excluded_below = -1;
 587         static char *fuzzy_dirname = NULL;
 588         static struct file_list *fuzzy_dirlist = NULL;
 589         struct file_struct *fuzzy_file = NULL;
 590         int fd = -1, f_copy = -1;
 591         STRUCT_STAT st, partial_st;
 592         struct file_struct *back_file = NULL;
 593         int statret, stat_errno;
 594         char *fnamecmp, *partialptr, *backupptr = NULL;
 595         char fnamecmpbuf[MAXPATHLEN];
 596         uchar fnamecmp_type;
 597
 598         if (list_only)
 599                 return;
 600
 601         if (!fname) {
 602                 if (fuzzy_dirlist) {
 603                         flist_free(fuzzy_dirlist);
 604                         fuzzy_dirlist = NULL;
 605                         fuzzy_dirname = NULL;
 606                 }
 607                 if (missing_below >= 0) {
 608                         dry_run--;
 609                         missing_below = -1;
 610                 }
 611                 return;
 612         }
 613
 614         if (verbose > 2) {
 615                 rprintf(FINFO, "recv_generator(%s,%d)\n",
 616                         safe_fname(fname), ndx);
 617         }
 618
 619         if (server_filter_list.head) {
 620                 if (excluded_below >= 0) {
 621                         if (file->dir.depth > excluded_below)
 622                                 goto skipping;
 623                         excluded_below = -1;
 624                 }
 625                 if (check_filter(&server_filter_list, fname,
 626                                  S_ISDIR(file->mode)) < 0) {
 627                         if (S_ISDIR(file->mode))
 628                                 excluded_below = file->dir.depth;
 629                     skipping:
 630                         if (verbose) {
 631                                 rprintf(FINFO,
 632                                         "skipping server-excluded file \"%s\"\n",
 633                                         safe_fname(fname));
 634                         }
 635                         return;
 636                 }
 637         }
 638
 639         if (missing_below >= 0 && file->dir.depth <= missing_below) {
 640                 dry_run--;
 641                 missing_below = -1;
 642         }
 643         if (dry_run > 1) {
 644                 statret = -1;
 645                 stat_errno = ENOENT;
 646         } else {
 647                 if (fuzzy_basis && S_ISREG(file->mode)) {
 648                         char *dn = file->dirname ? file->dirname : ".";
 649                         /* Yes, identical dirnames are guaranteed to have
 650                          * identical pointers at this point. */
 651                         if (fuzzy_dirname != dn) {
 652                                 if (fuzzy_dirlist)
 653                                         flist_free(fuzzy_dirlist);
 654                                 fuzzy_dirname = dn;
 655                                 fuzzy_dirlist = get_dirlist(fuzzy_dirname, -1,
 656                                                             1);
 657                         }
 658                 }
 659
 660                 statret = link_stat(fname, &st,
 661                                     keep_dirlinks && S_ISDIR(file->mode));
 662                 stat_errno = errno;
 663         }
 664
 665         if (only_existing && statret == -1 && stat_errno == ENOENT) {
 666                 /* we only want to update existing files */
 667                 if (verbose > 1) {
 668                         rprintf(FINFO, "not creating new file \"%s\"\n",
 669                                 safe_fname(fname));
 670                 }
 671                 return;
 672         }
 673
 674         if (statret == 0 && !preserve_perms
 675             && S_ISDIR(st.st_mode) == S_ISDIR(file->mode)) {
 676                 /* if the file exists already and we aren't perserving
 677                  * permissions then act as though the remote end sent
 678                  * us the file permissions we already have */
 679                 file->mode = (file->mode & ~CHMOD_BITS)
 680                            | (st.st_mode & CHMOD_BITS);
 681         }
 682
 683         if (S_ISDIR(file->mode)) {
 684                 /* The file to be received is a directory, so we need
 685                  * to prepare appropriately.  If there is already a
 686                  * file of that name and it is *not* a directory, then
 687                  * we need to delete it.  If it doesn't exist, then
 688                  * (perhaps recursively) create it. */
 689                 if (statret == 0 && !S_ISDIR(st.st_mode)) {
 690                         delete_item(fname, st.st_mode, DEL_TERSE);
 691                         statret = -1;
 692                 }
 693                 if (dry_run && statret != 0 && missing_below < 0) {
 694                         missing_below = file->dir.depth;
 695                         dry_run++;
 696                 }
 697                 if (itemizing && f_out != -1) {
 698                         itemize(file, ndx, statret, &st,
 699                                 statret ? ITEM_LOCAL_CHANGE : 0, 0, NULL);
 700                 }
 701                 if (statret != 0 && do_mkdir(fname,file->mode) != 0 && errno != EEXIST) {
 702                         if (!relative_paths || errno != ENOENT
 703                             || create_directory_path(fname, orig_umask) < 0
 704                             || do_mkdir(fname, file->mode) < 0) {
 705                                 rsyserr(FERROR, errno,
 706                                         "recv_generator: mkdir %s failed",
 707                                         full_fname(fname));
 708                         }
 709                 }
 710                 if (set_perms(fname, file, statret ? NULL : &st, 0)
 711                     && verbose && code && f_out != -1)
 712                         rprintf(code, "%s/\n", safe_fname(fname));
 713                 if (delete_during && f_out != -1 && !phase && dry_run < 2
 714                     && (file->flags & FLAG_DEL_HERE))
 715                         delete_in_dir(the_file_list, fname, file);
 716                 return;
 717         }
 718
 719         if (max_size && file->length > max_size) {
 720                 if (verbose > 1) {
 721                         rprintf(FINFO, "%s is over max-size\n",
 722                                 safe_fname(fname));
 723                 }
 724                 return;
 725         }
 726
 727         if (preserve_links && S_ISLNK(file->mode)) {
 728 #ifdef SUPPORT_LINKS
 729                 if (safe_symlinks && unsafe_symlink(file->u.link, fname)) {
 730                         if (verbose) {
 731                                 rprintf(FINFO,
 732                                         "ignoring unsafe symlink %s -> \"%s\"\n",
 733                                         full_fname(fname),
 734                                         safe_fname(file->u.link));
 735                         }
 736                         return;
 737                 }
 738                 if (statret == 0) {
 739                         char lnk[MAXPATHLEN];
 740                         int len;
 741
 742                         if (!S_ISDIR(st.st_mode)
 743                             && (len = readlink(fname, lnk, MAXPATHLEN-1)) > 0) {
 744                                 lnk[len] = 0;
 745                                 /* A link already pointing to the
 746                                  * right place -- no further action
 747                                  * required. */
 748                                 if (strcmp(lnk, file->u.link) == 0) {
 749                                         if (itemizing) {
 750                                                 itemize(file, ndx, 0, &st, 0,
 751                                                         0, NULL);
 752                                         }
 753                                         set_perms(fname, file, &st,
 754                                                   maybe_PERMS_REPORT);
 755                                         return;
 756                                 }
 757                         }
 758                         /* Not the right symlink (or not a symlink), so
 759                          * delete it. */
 760                         if (S_ISLNK(st.st_mode))
 761                                 delete_item(fname, st.st_mode, DEL_TERSE);
 762                         else {
 763                                 delete_item(fname, st.st_mode, DEL_TERSE);
 764                                 statret = -1;
 765                         }
 766                 }
 767                 if (do_symlink(file->u.link,fname) != 0) {
 768                         rsyserr(FERROR, errno, "symlink %s -> \"%s\" failed",
 769                                 full_fname(fname), safe_fname(file->u.link));
 770                 } else {
 771                         set_perms(fname,file,NULL,0);
 772                         if (itemizing) {
 773                                 itemize(file, ndx, statret, &st,
 774                                         ITEM_LOCAL_CHANGE, 0, NULL);
 775                         }
 776                         if (code && verbose) {
 777                                 rprintf(code, "%s -> %s\n", safe_fname(fname),
 778                                         safe_fname(file->u.link));
 779                         }
 780                         if (remove_sent_files && !dry_run) {
 781                                 char numbuf[4];
 782                                 SIVAL(numbuf, 0, ndx);
 783                                 send_msg(MSG_SUCCESS, numbuf, 4);
 784                         }
 785                 }
 786 #endif
 787                 return;
 788         }
 789
 790         if (am_root && preserve_devices && IS_DEVICE(file->mode)) {
 791                 if (statret != 0 ||
 792                     st.st_mode != file->mode ||
 793                     st.st_rdev != file->u.rdev) {
 794                         delete_item(fname, st.st_mode, DEL_TERSE);
 795                         if (!IS_DEVICE(st.st_mode))
 796                                 statret = -1;
 797                         if (verbose > 2) {
 798                                 rprintf(FINFO,"mknod(%s,0%o,0x%x)\n",
 799                                         safe_fname(fname),
 800                                         (int)file->mode, (int)file->u.rdev);
 801                         }
 802                         if (do_mknod(fname,file->mode,file->u.rdev) != 0) {
 803                                 rsyserr(FERROR, errno, "mknod %s failed",
 804                                         full_fname(fname));
 805                         } else {
 806                                 set_perms(fname,file,NULL,0);
 807                                 if (itemizing) {
 808                                         itemize(file, ndx, statret, &st,
 809                                                 ITEM_LOCAL_CHANGE, 0, NULL);
 810                                 }
 811                                 if (code && verbose) {
 812                                         rprintf(code, "%s\n",
 813                                                 safe_fname(fname));
 814                                 }
 815                         }
 816                 } else {
 817                         if (itemizing)
 818                                 itemize(file, ndx, statret, &st, 0, 0, NULL);
 819                         set_perms(fname, file, &st, maybe_PERMS_REPORT);
 820                 }
 821                 return;
 822         }
 823
 824         if (preserve_hard_links && hard_link_check(file, ndx, HL_CHECK_MASTER))
 825                 return;
 826
 827         if (!S_ISREG(file->mode)) {
 828                 rprintf(FINFO, "skipping non-regular file \"%s\"\n",
 829                         safe_fname(fname));
 830                 return;
 831         }
 832
 833         if (opt_ignore_existing && statret == 0) {
 834                 if (verbose > 1)
 835                         rprintf(FINFO, "%s exists\n", safe_fname(fname));
 836                 return;
 837         }
 838
 839         if (update_only && statret == 0
 840             && cmp_modtime(st.st_mtime, file->modtime) > 0) {
 841                 if (verbose > 1)
 842                         rprintf(FINFO, "%s is newer\n", safe_fname(fname));
 843                 return;
 844         }
 845
 846         fnamecmp = fname;
 847         fnamecmp_type = FNAMECMP_FNAME;
 848
 849         if (statret != 0 && basis_dir[0] != NULL) {
 850                 int best_match = -1;
 851                 int match_level = 0;
 852                 int i = 0;
 853                 do {
 854                         pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 855                                  basis_dir[i], fname);
 856                         if (link_stat(fnamecmpbuf, &st, 0) < 0
 857                             || !S_ISREG(st.st_mode))
 858                                 continue;
 859                         switch (match_level) {
 860                         case 0:
 861                                 best_match = i;
 862                                 match_level = 1;
 863                                 /* FALL THROUGH */
 864                         case 1:
 865                                 if (!unchanged_file(fnamecmpbuf, file, &st))
 866                                         continue;
 867                                 best_match = i;
 868                                 match_level = 2;
 869                                 /* FALL THROUGH */
 870                         case 2:
 871                                 if (!unchanged_attrs(file, &st))
 872                                         continue;
 873                                 best_match = i;
 874                                 match_level = 3;
 875                                 break;
 876                         }
 877                         break;
 878                 } while (basis_dir[++i] != NULL);
 879                 if (match_level) {
 880                         statret = 0;
 881                         if (i != best_match) {
 882                                 i = best_match;
 883                                 pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 884                                          basis_dir[i], fname);
 885                                 if (link_stat(fnamecmpbuf, &st, 0) < 0) {
 886                                         match_level = 0;
 887                                         statret = -1;
 888                                         stat_errno = errno;
 889                                 }
 890                         }
 891 #ifdef HAVE_LINK
 892                         if (link_dest && match_level == 3) {
 893                                 if (hard_link_one(file, ndx, fname, -1, &st,
 894                                                   fnamecmpbuf, 1,
 895                                                   itemizing && verbose > 1,
 896                                                   code) == 0)
 897                                         return;
 898                                 if (verbose) {
 899                                         rsyserr(FINFO, errno, "link %s => %s",
 900                                                 full_fname(fnamecmpbuf),
 901                                                 safe_fname(fname));
 902                                 }
 903                                 match_level = 2;
 904                         }
 905 #endif
 906                         if (compare_dest || (match_level && match_level < 3)) {
 907                                 fnamecmp = fnamecmpbuf;
 908                                 fnamecmp_type = i;
 909                         }
 910                 }
 911         }
 912
 913         if (statret == 0 && !S_ISREG(st.st_mode)) {
 914                 if (delete_item(fname, st.st_mode, DEL_TERSE) != 0)
 915                         return;
 916                 statret = -1;
 917                 stat_errno = ENOENT;
 918         }
 919
 920         if (partial_dir && (partialptr = partial_dir_fname(fname)) != NULL
 921             && link_stat(partialptr, &partial_st, 0) == 0
 922             && S_ISREG(partial_st.st_mode)) {
 923                 if (statret != 0)
 924                         goto prepare_to_open;
 925         } else
 926                 partialptr = NULL;
 927
 928         if (statret != 0 && fuzzy_basis && dry_run <= 1) {
 929                 int j = find_fuzzy(file, fuzzy_dirlist);
 930                 if (j >= 0) {
 931                         fuzzy_file = fuzzy_dirlist->files[j];
 932                         f_name_to(fuzzy_file, fnamecmpbuf);
 933                         if (verbose > 2) {
 934                                 rprintf(FINFO, "fuzzy basis selected for %s: %s\n",
 935                                         safe_fname(fname), safe_fname(fnamecmpbuf));
 936                         }
 937                         st.st_mode = fuzzy_file->mode;
 938                         st.st_size = fuzzy_file->length;
 939                         st.st_mtime = fuzzy_file->modtime;
 940                         statret = 0;
 941                         fnamecmp = fnamecmpbuf;
 942                         fnamecmp_type = FNAMECMP_FUZZY;
 943                 }
 944         }
 945
 946         if (statret != 0) {
 947                 if (preserve_hard_links && hard_link_check(file, ndx, HL_SKIP))
 948                         return;
 949                 if (stat_errno == ENOENT)
 950                         goto notify_others;
 951                 if (verbose > 1) {
 952                         rsyserr(FERROR, stat_errno,
 953                                 "recv_generator: failed to stat %s",
 954                                 full_fname(fname));
 955                 }
 956                 return;
 957         }
 958
 959         if (!compare_dest && fnamecmp_type <= FNAMECMP_BASIS_DIR_HIGH)
 960                 ;
 961         else if (fnamecmp_type == FNAMECMP_FUZZY)
 962                 ;
 963         else if (unchanged_file(fnamecmp, file, &st)) {
 964                 if (fnamecmp_type == FNAMECMP_FNAME) {
 965                         if (itemizing)
 966                                 itemize(file, ndx, statret, &st, 0, 0, NULL);
 967                         set_perms(fname, file, &st, maybe_PERMS_REPORT);
 968                         if (preserve_hard_links && file->link_u.links)
 969                                 hard_link_cluster(file, ndx, itemizing, code);
 970                         return;
 971                 }
 972                 /* Only --compare-dest gets here. */
 973                 if (unchanged_attrs(file, &st)) {
 974                         itemize(file, ndx, statret, &st,
 975                                 ITEM_NO_DEST_AND_NO_UPDATE, 0, NULL);
 976                         return;
 977                 }
 978         }
 979
 980 prepare_to_open:
 981         if (partialptr) {
 982                 st = partial_st;
 983                 fnamecmp = partialptr;
 984                 fnamecmp_type = FNAMECMP_PARTIAL_DIR;
 985                 statret = 0;
 986         }
 987
 988         if (dry_run || read_batch || whole_file)
 989                 goto notify_others;
 990
 991         if (fuzzy_basis) {
 992                 int j = flist_find(fuzzy_dirlist, file);
 993                 if (j >= 0) /* don't use changing file as future fuzzy basis */
 994                         fuzzy_dirlist->files[j]->flags |= FLAG_NO_FUZZY;
 995         }
 996
 997         /* open the file */
 998         fd = do_open(fnamecmp, O_RDONLY, 0);
 999
1000         if (fd == -1) {
1001                 rsyserr(FERROR, errno, "failed to open %s, continuing",
1002                         full_fname(fnamecmp));
1003             pretend_missing:
1004                 /* pretend the file didn't exist */
1005                 if (preserve_hard_links && hard_link_check(file, ndx, HL_SKIP))
1006                         return;
1007                 statret = -1;
1008                 goto notify_others;
1009         }
1010
1011         if (inplace && make_backups && fnamecmp_type == FNAMECMP_FNAME) {
1012                 if (!(backupptr = get_backup_name(fname))) {
1013                         close(fd);
1014                         return;
1015                 }
1016                 if (!(back_file = make_file(fname, NULL, NO_FILTERS))) {
1017                         close(fd);
1018                         goto pretend_missing;
1019                 }
1020                 if (robust_unlink(backupptr) && errno != ENOENT) {
1021                         rsyserr(FERROR, errno, "unlink %s",
1022                                 full_fname(backupptr));
1023                         free(back_file);
1024                         close(fd);
1025                         return;
1026                 }
1027                 if ((f_copy = do_open(backupptr,
1028                     O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0600)) < 0) {
1029                         rsyserr(FERROR, errno, "open %s",
1030                                 full_fname(backupptr));
1031                         free(back_file);
1032                         close(fd);
1033                         return;
1034                 }
1035                 fnamecmp_type = FNAMECMP_BACKUP;
1036         }
1037
1038         if (verbose > 3) {
1039                 rprintf(FINFO, "gen mapped %s of size %.0f\n",
1040                         safe_fname(fnamecmp), (double)st.st_size);
1041         }
1042
1043         if (verbose > 2)
1044                 rprintf(FINFO, "generating and sending sums for %d\n", ndx);
1045
1046 notify_others:
1047         write_int(f_out, ndx);
1048         if (itemizing) {
1049                 int iflags = ITEM_TRANSFER;
1050                 if (always_checksum)
1051                         iflags |= ITEM_REPORT_CHECKSUM;
1052                 if (fnamecmp_type != FNAMECMP_FNAME)
1053                         iflags |= ITEM_BASIS_TYPE_FOLLOWS;
1054                 if (fnamecmp_type == FNAMECMP_FUZZY)
1055                         iflags |= ITEM_XNAME_FOLLOWS;
1056                 itemize(file, -1, statret, &st, iflags, fnamecmp_type,
1057                         fuzzy_file ? fuzzy_file->basename : NULL);
1058         }
1059
1060         if (dry_run) {
1061                 if (preserve_hard_links && file->link_u.links)
1062                         hard_link_cluster(file, ndx, itemizing, code);
1063                 return;
1064         }
1065         if (read_batch)
1066                 return;
1067
1068         if (statret != 0 || whole_file) {
1069                 write_sum_head(f_out, NULL);
1070                 return;
1071         }
1072
1073         generate_and_send_sums(fd, st.st_size, f_out, f_copy);
1074
1075         if (f_copy >= 0) {
1076                 close(f_copy);
1077                 set_perms(backupptr, back_file, NULL, 0);
1078                 if (verbose > 1) {
1079                         rprintf(FINFO, "backed up %s to %s\n",
1080                                 safe_fname(fname), safe_fname(backupptr));
1081                 }
1082                 free(back_file);
1083         }
1084
1085         close(fd);
1086 }
1087
1088
1089 void generate_files(int f_out, struct file_list *flist, char *local_name)
1090 {
1091         int i, lull_mod;
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
1144                 if (!file->basename)
1145                         continue;
1146
1147                 recv_generator(local_name ? local_name : f_name_to(file, fbuf),
1148                                file, i, itemizing, maybe_PERMS_REPORT, code,
1149                                f_out);
1150
1151                 /* We need to ensure that any dirs we create have writeable
1152                  * permissions during the time we are putting files within
1153                  * them.  This is then fixed after the transfer is done. */
1154                 if (!am_root && S_ISDIR(file->mode) && !(file->mode & S_IWUSR)) {
1155                         int mode = file->mode | S_IWUSR; /* user write */
1156                         char *fname = local_name ? local_name : fbuf;
1157                         if (do_chmod(fname, mode & CHMOD_BITS) < 0) {
1158                                 rsyserr(FERROR, errno,
1159                                         "failed to modify permissions on %s",
1160                                         full_fname(fname));
1161                         }
1162                         need_retouch_dir_perms = 1;
1163                 }
1164
1165                 if (preserve_hard_links)
1166                         check_for_finished_hlinks(itemizing, code);
1167
1168                 if (allowed_lull && !(i % lull_mod))
1169                         maybe_send_keepalive();
1170         }
1171         recv_generator(NULL, NULL, 0, 0, 0, code, -1);
1172         if (delete_during)
1173                 delete_in_dir(NULL, NULL, NULL);
1174
1175         phase++;
1176         csum_length = SUM_LENGTH;
1177         only_existing = max_size = opt_ignore_existing = 0;
1178         update_only = always_checksum = size_only = 0;
1179         ignore_times = 1;
1180         make_backups = 0; /* avoid a duplicate backup for inplace processing */
1181
1182         /* We expect to just sit around now, so don't exit on a timeout.
1183          * If we really get a timeout then the other process should exit. */
1184         ignore_timeout = 1;
1185
1186         if (verbose > 2)
1187                 rprintf(FINFO,"generate_files phase=%d\n",phase);
1188
1189         write_int(f_out, -1);
1190
1191         /* files can cycle through the system more than once
1192          * to catch initial checksum errors */
1193         while ((i = get_redo_num(itemizing, code)) != -1) {
1194                 struct file_struct *file = flist->files[i];
1195                 recv_generator(local_name ? local_name : f_name_to(file, fbuf),
1196                                file, i, itemizing, maybe_PERMS_REPORT, code,
1197                                f_out);
1198         }
1199
1200         phase++;
1201         only_existing = save_only_existing;
1202         opt_ignore_existing = save_opt_ignore_existing;
1203
1204         if (verbose > 2)
1205                 rprintf(FINFO,"generate_files phase=%d\n",phase);
1206
1207         write_int(f_out, -1);
1208
1209         /* Read post-redo-phase MSG_DONE and any prior messages. */
1210         get_redo_num(itemizing, code);
1211
1212         if (delete_after && !local_name && flist->count > 0)
1213                 do_delete_pass(flist);
1214
1215         if ((need_retouch_dir_perms || need_retouch_dir_times)
1216             && !list_only && !local_name && !dry_run) {
1217                 int j = 0;
1218                 /* Now we need to fix any directory permissions that were
1219                  * modified during the transfer and/or re-set any tweaked
1220                  * modified-time values. */
1221                 for (i = 0; i < flist->count; i++) {
1222                         struct file_struct *file = flist->files[i];
1223                         if (!file->basename || !S_ISDIR(file->mode))
1224                                 continue;
1225                         if (!need_retouch_dir_times && file->mode & S_IWUSR)
1226                                 continue;
1227                         recv_generator(local_name ? local_name : f_name(file),
1228                                        file, i, itemizing, maybe_PERMS_REPORT,
1229                                        code, -1);
1230                         if (allowed_lull && !(j++ % lull_mod))
1231                                 maybe_send_keepalive();
1232                 }
1233         }
1234         recv_generator(NULL, NULL, 0, 0, 0, code, -1);
1235
1236         if (max_delete > 0 && deletion_count > max_delete) {
1237                 rprintf(FINFO,
1238                         "Deletions stopped due to --max-delete limit (%d skipped)\n",
1239                         deletion_count - max_delete);
1240                 io_error |= IOERR_DEL_LIMIT;
1241         }
1242
1243         if (verbose > 2)
1244                 rprintf(FINFO,"generate_files finished\n");
1245 }