generator.c

   1 /*
   2  * Routines that are exclusive to the generator process.
   3  *
   4  * Copyright (C) 1996-2000 Andrew Tridgell
   5  * Copyright (C) 1996 Paul Mackerras
   6  * Copyright (C) 2002 Martin Pool <mbp@samba.org>
   7  * Copyright (C) 2003, 2004, 2005, 2006 Wayne Davison
   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 along
  20  * with this program; if not, write to the Free Software Foundation, Inc.,
  21  * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
  22  */
  23
  24 #include "rsync.h"
  25
  26 extern int verbose;
  27 extern int dry_run;
  28 extern int do_xfers;
  29 extern int log_format_has_i;
  30 extern int logfile_format_has_i;
  31 extern int am_root;
  32 extern int am_server;
  33 extern int am_daemon;
  34 extern int do_progress;
  35 extern int recurse;
  36 extern int relative_paths;
  37 extern int implied_dirs;
  38 extern int keep_dirlinks;
  39 extern int preserve_links;
  40 extern int preserve_devices;
  41 extern int preserve_specials;
  42 extern int preserve_hard_links;
  43 extern int preserve_perms;
  44 extern int preserve_uid;
  45 extern int preserve_gid;
  46 extern int preserve_times;
  47 extern int omit_dir_times;
  48 extern int delete_mode;
  49 extern int delete_before;
  50 extern int delete_during;
  51 extern int delete_after;
  52 extern int module_id;
  53 extern int ignore_errors;
  54 extern int remove_sent_files;
  55 extern int delay_updates;
  56 extern int update_only;
  57 extern int ignore_existing;
  58 extern int ignore_non_existing;
  59 extern int inplace;
  60 extern int append_mode;
  61 extern int make_backups;
  62 extern int csum_length;
  63 extern int ignore_times;
  64 extern int size_only;
  65 extern OFF_T max_size;
  66 extern OFF_T min_size;
  67 extern int io_error;
  68 extern int allowed_lull;
  69 extern int sock_f_out;
  70 extern int ignore_timeout;
  71 extern int protocol_version;
  72 extern int fuzzy_basis;
  73 extern int always_checksum;
  74 extern int checksum_len;
  75 extern char *partial_dir;
  76 extern char *basis_dir[];
  77 extern int compare_dest;
  78 extern int copy_dest;
  79 extern int link_dest;
  80 extern int whole_file;
  81 extern int list_only;
  82 extern int read_batch;
  83 extern int safe_symlinks;
  84 extern long block_size; /* "long" because popt can't set an int32. */
  85 extern int max_delete;
  86 extern int force_delete;
  87 extern int one_file_system;
  88 extern struct stats stats;
  89 extern dev_t filesystem_dev;
  90 extern char *backup_dir;
  91 extern char *backup_suffix;
  92 extern int backup_suffix_len;
  93 extern struct file_list *the_file_list;
  94 extern struct filter_list_struct server_filter_list;
  95
  96 static int deletion_count = 0; /* used to implement --max-delete */
  97
  98 /* For calling delete_file() */
  99 #define DEL_FORCE_RECURSE       (1<<1) /* recurse even w/o --force */
 100 #define DEL_TERSE               (1<<3)
 101
 102
 103 static int is_backup_file(char *fn)
 104 {
 105         int k = strlen(fn) - backup_suffix_len;
 106         return k > 0 && strcmp(fn+k, backup_suffix) == 0;
 107 }
 108
 109
 110 /* Delete a file or directory.  If DEL_FORCE_RECURSE is set in the flags, or if
 111  * force_delete is set, this will delete recursively.
 112  *
 113  * Note that fname must point to a MAXPATHLEN buffer if the mode indicates it's
 114  * a directory! (The buffer is used for recursion, but returned unchanged.)
 115  */
 116 static int delete_item(char *fname, int mode, int flags)
 117 {
 118         struct file_list *dirlist;
 119         int j, dlen, zap_dir, ok;
 120         unsigned remainder;
 121         void *save_filters;
 122         char *p;
 123
 124         if (!S_ISDIR(mode)) {
 125                 if (max_delete && ++deletion_count > max_delete)
 126                         return 0;
 127                 if (make_backups && (backup_dir || !is_backup_file(fname)))
 128                         ok = make_backup(fname);
 129                 else
 130                         ok = robust_unlink(fname) == 0;
 131                 if (ok) {
 132                         if (!(flags & DEL_TERSE))
 133                                 log_delete(fname, mode);
 134                         return 0;
 135                 }
 136                 if (errno == ENOENT) {
 137                         deletion_count--;
 138                         return 0;
 139                 }
 140                 rsyserr(FERROR, errno, "delete_file: unlink %s failed",
 141                         full_fname(fname));
 142                 return -1;
 143         }
 144
 145         zap_dir = flags & DEL_FORCE_RECURSE || force_delete;
 146         if ((max_delete && ++deletion_count > max_delete)
 147             || (dry_run && zap_dir)) {
 148                 ok = 0;
 149                 errno = ENOTEMPTY;
 150         } else if (make_backups && !backup_dir && !is_backup_file(fname)
 151             && !(flags & DEL_FORCE_RECURSE))
 152                 ok = make_backup(fname);
 153         else
 154                 ok = do_rmdir(fname) == 0;
 155         if (ok) {
 156                 if (!(flags & DEL_TERSE))
 157                         log_delete(fname, mode);
 158                 return 0;
 159         }
 160         if (errno == ENOENT) {
 161                 deletion_count--;
 162                 return 0;
 163         }
 164         if (!zap_dir) {
 165                 rsyserr(FERROR, errno, "delete_file: rmdir %s failed",
 166                         full_fname(fname));
 167                 return -1;
 168         }
 169         flags |= DEL_FORCE_RECURSE; /* mark subdir dels as not "in the way" */
 170         deletion_count--;
 171
 172         dlen = strlen(fname);
 173         save_filters = push_local_filters(fname, dlen);
 174
 175         dirlist = get_dirlist(fname, dlen, 0);
 176
 177         p = fname + dlen;
 178         if (dlen != 1 || *fname != '/')
 179                 *p++ = '/';
 180         remainder = MAXPATHLEN - (p - fname);
 181
 182         for (j = dirlist->count; j--; ) {
 183                 struct file_struct *fp = dirlist->files[j];
 184
 185                 if (fp->flags & FLAG_MOUNT_POINT)
 186                         continue;
 187
 188                 strlcpy(p, fp->basename, remainder);
 189                 delete_item(fname, fp->mode, flags & ~DEL_TERSE);
 190         }
 191         flist_free(dirlist);
 192
 193         fname[dlen] = '\0';
 194
 195         pop_local_filters(save_filters);
 196
 197         if (max_delete && ++deletion_count > max_delete)
 198                 return 0;
 199
 200         if (do_rmdir(fname) == 0) {
 201                 if (!(flags & DEL_TERSE))
 202                         log_delete(fname, mode);
 203         } else if (errno != ENOTEMPTY && errno != EEXIST && errno != ENOENT) {
 204                 rsyserr(FERROR, errno, "delete_file: rmdir %s failed",
 205                         full_fname(fname));
 206                 return -1;
 207         }
 208
 209         return 0;
 210 }
 211
 212
 213 /* This function is used to implement per-directory deletion, and is used by
 214  * all the --delete-WHEN options.  Note that the fbuf pointer must point to a
 215  * MAXPATHLEN buffer with the name of the directory in it (the functions we
 216  * call will append names onto the end, but the old dir value will be restored
 217  * on exit). */
 218 static void delete_in_dir(struct file_list *flist, char *fbuf,
 219                           struct file_struct *file, STRUCT_STAT *stp)
 220 {
 221         static int min_depth = MAXPATHLEN, cur_depth = -1;
 222         static void *filt_array[MAXPATHLEN/2+1];
 223         static int already_warned = 0;
 224         struct file_list *dirlist;
 225         char delbuf[MAXPATHLEN];
 226         int dlen, i;
 227
 228         if (!flist) {
 229                 while (cur_depth >= min_depth)
 230                         pop_local_filters(filt_array[cur_depth--]);
 231                 min_depth = MAXPATHLEN;
 232                 cur_depth = -1;
 233                 return;
 234         }
 235
 236         if (verbose > 2)
 237                 rprintf(FINFO, "delete_in_dir(%s)\n", fbuf);
 238
 239         if (allowed_lull)
 240                 maybe_send_keepalive();
 241
 242         if (file->dir.depth >= MAXPATHLEN/2+1)
 243                 return; /* Impossible... */
 244
 245         if (io_error && !(lp_ignore_errors(module_id) || ignore_errors)) {
 246                 if (already_warned)
 247                         return;
 248                 rprintf(FINFO,
 249                         "IO error encountered -- skipping file deletion\n");
 250                 already_warned = 1;
 251                 return;
 252         }
 253
 254         while (cur_depth >= file->dir.depth && cur_depth >= min_depth)
 255                 pop_local_filters(filt_array[cur_depth--]);
 256         cur_depth = file->dir.depth;
 257         if (min_depth > cur_depth)
 258                 min_depth = cur_depth;
 259         dlen = strlen(fbuf);
 260         filt_array[cur_depth] = push_local_filters(fbuf, dlen);
 261
 262         if (one_file_system) {
 263                 if (file->flags & FLAG_TOP_DIR)
 264                         filesystem_dev = stp->st_dev;
 265                 else if (filesystem_dev != stp->st_dev)
 266                         return;
 267         }
 268
 269         dirlist = get_dirlist(fbuf, dlen, 0);
 270
 271         /* If an item in dirlist is not found in flist, delete it
 272          * from the filesystem. */
 273         for (i = dirlist->count; i--; ) {
 274                 struct file_struct *fp = dirlist->files[i];
 275                 if (!fp->basename || fp->flags & FLAG_MOUNT_POINT)
 276                         continue;
 277                 if (flist_find(flist, fp) < 0) {
 278                         f_name(fp, delbuf);
 279                         delete_item(delbuf, fp->mode, DEL_FORCE_RECURSE);
 280                 }
 281         }
 282
 283         flist_free(dirlist);
 284 }
 285
 286 /* This deletes any files on the receiving side that are not present on the
 287  * sending side.  This is used by --delete-before and --delete-after. */
 288 static void do_delete_pass(struct file_list *flist)
 289 {
 290         char fbuf[MAXPATHLEN];
 291         STRUCT_STAT st;
 292         int j;
 293
 294         if (dry_run > 1 /* destination doesn't exist yet */
 295          || list_only)
 296                 return;
 297
 298         for (j = 0; j < flist->count; j++) {
 299                 struct file_struct *file = flist->files[j];
 300
 301                 if (!(file->flags & FLAG_DEL_HERE))
 302                         continue;
 303
 304                 f_name(file, fbuf);
 305                 if (verbose > 1 && file->flags & FLAG_TOP_DIR)
 306                         rprintf(FINFO, "deleting in %s\n", fbuf);
 307
 308                 if (link_stat(fbuf, &st, keep_dirlinks) < 0
 309                  || !S_ISDIR(st.st_mode))
 310                         continue;
 311
 312                 delete_in_dir(flist, fbuf, file, &st);
 313         }
 314         delete_in_dir(NULL, NULL, NULL, NULL);
 315
 316         if (do_progress && !am_server)
 317                 rprintf(FINFO, "                    \r");
 318 }
 319
 320 int unchanged_attrs(struct file_struct *file, STRUCT_STAT *st)
 321 {
 322         if (preserve_perms
 323          && (st->st_mode & CHMOD_BITS) != (file->mode & CHMOD_BITS))
 324                 return 0;
 325
 326         if (am_root && preserve_uid && st->st_uid != file->uid)
 327                 return 0;
 328
 329         if (preserve_gid && file->gid != GID_NONE && st->st_gid != file->gid)
 330                 return 0;
 331
 332         return 1;
 333 }
 334
 335 void itemize(struct file_struct *file, int ndx, int statret, STRUCT_STAT *st,
 336              int32 iflags, uchar fnamecmp_type, char *xname)
 337 {
 338         if (statret >= 0) { /* A from-dest-dir statret can == 1! */
 339                 int keep_time = !preserve_times ? 0
 340                     : S_ISDIR(file->mode) ? !omit_dir_times
 341                     : !S_ISLNK(file->mode);
 342
 343                 if (S_ISREG(file->mode) && file->length != st->st_size)
 344                         iflags |= ITEM_REPORT_SIZE;
 345                 if ((iflags & (ITEM_TRANSFER|ITEM_LOCAL_CHANGE) && !keep_time
 346                      && (!(iflags & ITEM_XNAME_FOLLOWS) || *xname))
 347                     || (keep_time && cmp_time(file->modtime, st->st_mtime) != 0))
 348                         iflags |= ITEM_REPORT_TIME;
 349                 if ((file->mode & CHMOD_BITS) != (st->st_mode & CHMOD_BITS))
 350                         iflags |= ITEM_REPORT_PERMS;
 351                 if (preserve_uid && am_root && file->uid != st->st_uid)
 352                         iflags |= ITEM_REPORT_OWNER;
 353                 if (preserve_gid && file->gid != GID_NONE
 354                     && st->st_gid != file->gid)
 355                         iflags |= ITEM_REPORT_GROUP;
 356         } else
 357                 iflags |= ITEM_IS_NEW;
 358
 359         iflags &= 0xffff;
 360         if ((iflags & SIGNIFICANT_ITEM_FLAGS || verbose > 1
 361           || log_format_has_i > 1 || (xname && *xname)) && !read_batch) {
 362                 if (protocol_version >= 29) {
 363                         if (ndx >= 0)
 364                                 write_int(sock_f_out, ndx);
 365                         write_shortint(sock_f_out, iflags);
 366                         if (iflags & ITEM_BASIS_TYPE_FOLLOWS)
 367                                 write_byte(sock_f_out, fnamecmp_type);
 368                         if (iflags & ITEM_XNAME_FOLLOWS)
 369                                 write_vstring(sock_f_out, xname, strlen(xname));
 370                 } else if (ndx >= 0)
 371                         log_item(file, &stats, iflags, xname);
 372         }
 373 }
 374
 375
 376 /* Perform our quick-check heuristic for determining if a file is unchanged. */
 377 int unchanged_file(char *fn, struct file_struct *file, STRUCT_STAT *st)
 378 {
 379         if (st->st_size != file->length)
 380                 return 0;
 381
 382         /* if always checksum is set then we use the checksum instead
 383            of the file time to determine whether to sync */
 384         if (always_checksum && S_ISREG(st->st_mode)) {
 385                 char sum[MD4_SUM_LENGTH];
 386                 file_checksum(fn, sum, st->st_size);
 387                 return memcmp(sum, file->u.sum, checksum_len) == 0;
 388         }
 389
 390         if (size_only)
 391                 return 1;
 392
 393         if (ignore_times)
 394                 return 0;
 395
 396         return cmp_time(st->st_mtime, file->modtime) == 0;
 397 }
 398
 399
 400 /*
 401  * set (initialize) the size entries in the per-file sum_struct
 402  * calculating dynamic block and checksum sizes.
 403  *
 404  * This is only called from generate_and_send_sums() but is a separate
 405  * function to encapsulate the logic.
 406  *
 407  * The block size is a rounded square root of file length.
 408  *
 409  * The checksum size is determined according to:
 410  *     blocksum_bits = BLOCKSUM_BIAS + 2*log2(file_len) - log2(block_len)
 411  * provided by Donovan Baarda which gives a probability of rsync
 412  * algorithm corrupting data and falling back using the whole md4
 413  * checksums.
 414  *
 415  * This might be made one of several selectable heuristics.
 416  */
 417 static void sum_sizes_sqroot(struct sum_struct *sum, int64 len)
 418 {
 419         int32 blength;
 420         int s2length;
 421
 422         if (block_size)
 423                 blength = block_size;
 424         else if (len <= BLOCK_SIZE * BLOCK_SIZE)
 425                 blength = BLOCK_SIZE;
 426         else {
 427                 int32 c;
 428                 int64 l;
 429                 int cnt;
 430                 for (c = 1, l = len, cnt = 0; l >>= 2; c <<= 1, cnt++) {}
 431                 if (cnt >= 31 || c >= MAX_BLOCK_SIZE)
 432                         blength = MAX_BLOCK_SIZE;
 433                 else {
 434                     blength = 0;
 435                     do {
 436                             blength |= c;
 437                             if (len < (int64)blength * blength)
 438                                     blength &= ~c;
 439                             c >>= 1;
 440                     } while (c >= 8);   /* round to multiple of 8 */
 441                     blength = MAX(blength, BLOCK_SIZE);
 442                 }
 443         }
 444
 445         if (protocol_version < 27) {
 446                 s2length = csum_length;
 447         } else if (csum_length == SUM_LENGTH) {
 448                 s2length = SUM_LENGTH;
 449         } else {
 450                 int32 c;
 451                 int64 l;
 452                 int b = BLOCKSUM_BIAS;
 453                 for (l = len; l >>= 1; b += 2) {}
 454                 for (c = blength; c >>= 1 && b; b--) {}
 455                 /* add a bit, subtract rollsum, round up. */
 456                 s2length = (b + 1 - 32 + 7) / 8; /* --optimize in compiler-- */
 457                 s2length = MAX(s2length, csum_length);
 458                 s2length = MIN(s2length, SUM_LENGTH);
 459         }
 460
 461         sum->flength    = len;
 462         sum->blength    = blength;
 463         sum->s2length   = s2length;
 464         sum->remainder  = len % blength;
 465         sum->count      = len / blength + (sum->remainder != 0);
 466
 467         if (sum->count && verbose > 2) {
 468                 rprintf(FINFO,
 469                         "count=%.0f rem=%ld blength=%ld s2length=%d flength=%.0f\n",
 470                         (double)sum->count, (long)sum->remainder, (long)sum->blength,
 471                         sum->s2length, (double)sum->flength);
 472         }
 473 }
 474
 475
 476 /*
 477  * Generate and send a stream of signatures/checksums that describe a buffer
 478  *
 479  * Generate approximately one checksum every block_len bytes.
 480  */
 481 static void generate_and_send_sums(int fd, OFF_T len, int f_out, int f_copy)
 482 {
 483         int32 i;
 484         struct map_struct *mapbuf;
 485         struct sum_struct sum;
 486         OFF_T offset = 0;
 487
 488         sum_sizes_sqroot(&sum, len);
 489         write_sum_head(f_out, &sum);
 490
 491         if (append_mode > 0 && f_copy < 0)
 492                 return;
 493
 494         if (len > 0)
 495                 mapbuf = map_file(fd, len, MAX_MAP_SIZE, sum.blength);
 496         else
 497                 mapbuf = NULL;
 498
 499         for (i = 0; i < sum.count; i++) {
 500                 int32 n1 = (int32)MIN(len, (OFF_T)sum.blength);
 501                 char *map = map_ptr(mapbuf, offset, n1);
 502                 char sum2[SUM_LENGTH];
 503                 uint32 sum1;
 504
 505                 len -= n1;
 506                 offset += n1;
 507
 508                 if (f_copy >= 0) {
 509                         full_write(f_copy, map, n1);
 510                         if (append_mode > 0)
 511                                 continue;
 512                 }
 513
 514                 sum1 = get_checksum1(map, n1);
 515                 get_checksum2(map, n1, sum2);
 516
 517                 if (verbose > 3) {
 518                         rprintf(FINFO,
 519                                 "chunk[%.0f] offset=%.0f len=%ld sum1=%08lx\n",
 520                                 (double)i, (double)offset - n1, (long)n1,
 521                                 (unsigned long)sum1);
 522                 }
 523                 write_int(f_out, sum1);
 524                 write_buf(f_out, sum2, sum.s2length);
 525         }
 526
 527         if (mapbuf)
 528                 unmap_file(mapbuf);
 529 }
 530
 531
 532 /* Try to find a filename in the same dir as "fname" with a similar name. */
 533 static int find_fuzzy(struct file_struct *file, struct file_list *dirlist)
 534 {
 535         int fname_len, fname_suf_len;
 536         const char *fname_suf, *fname = file->basename;
 537         uint32 lowest_dist = 25 << 16; /* ignore a distance greater than 25 */
 538         int j, lowest_j = -1;
 539
 540         fname_len = strlen(fname);
 541         fname_suf = find_filename_suffix(fname, fname_len, &fname_suf_len);
 542
 543         for (j = 0; j < dirlist->count; j++) {
 544                 struct file_struct *fp = dirlist->files[j];
 545                 const char *suf, *name;
 546                 int len, suf_len;
 547                 uint32 dist;
 548
 549                 if (!S_ISREG(fp->mode) || !fp->length
 550                     || fp->flags & FLAG_NO_FUZZY)
 551                         continue;
 552
 553                 name = fp->basename;
 554
 555                 if (fp->length == file->length
 556                     && cmp_time(fp->modtime, file->modtime) == 0) {
 557                         if (verbose > 4) {
 558                                 rprintf(FINFO,
 559                                         "fuzzy size/modtime match for %s\n",
 560                                         name);
 561                         }
 562                         return j;
 563                 }
 564
 565                 len = strlen(name);
 566                 suf = find_filename_suffix(name, len, &suf_len);
 567
 568                 dist = fuzzy_distance(name, len, fname, fname_len);
 569                 /* Add some extra weight to how well the suffixes match. */
 570                 dist += fuzzy_distance(suf, suf_len, fname_suf, fname_suf_len)
 571                       * 10;
 572                 if (verbose > 4) {
 573                         rprintf(FINFO, "fuzzy distance for %s = %d.%05d\n",
 574                                 name, (int)(dist>>16), (int)(dist&0xFFFF));
 575                 }
 576                 if (dist <= lowest_dist) {
 577                         lowest_dist = dist;
 578                         lowest_j = j;
 579                 }
 580         }
 581
 582         return lowest_j;
 583 }
 584
 585 void check_for_finished_hlinks(int itemizing, enum logcode code)
 586 {
 587         struct file_struct *file;
 588         int ndx;
 589
 590         while ((ndx = get_hlink_num()) != -1) {
 591                 if (ndx < 0 || ndx >= the_file_list->count)
 592                         continue;
 593
 594                 file = the_file_list->files[ndx];
 595                 if (!file->link_u.links)
 596                         continue;
 597
 598                 hard_link_cluster(file, ndx, itemizing, code);
 599         }
 600 }
 601
 602 /* This is only called for regular files.  We return -2 if we've finished
 603  * handling the file, -1 if no dest-linking occurred, or a non-negative
 604  * value if we found an alternate basis file. */
 605 static int try_dests_reg(struct file_struct *file, char *fname, int ndx,
 606                          char *cmpbuf, STRUCT_STAT *stp, int itemizing,
 607                          int maybe_ATTRS_REPORT, enum logcode code)
 608 {
 609         int save_ignore_times = ignore_times;
 610         int save_size_only = size_only;
 611         int best_match = -1;
 612         int match_level = 0;
 613         int j = 0;
 614
 615         /* We can't let these send-affecting options affect our checking
 616          * for identical files in the alternate basis dirs. */
 617         ignore_times = size_only = 0;
 618
 619         do {
 620                 pathjoin(cmpbuf, MAXPATHLEN, basis_dir[j], fname);
 621                 if (link_stat(cmpbuf, stp, 0) < 0 || !S_ISREG(stp->st_mode))
 622                         continue;
 623                 switch (match_level) {
 624                 case 0:
 625                         best_match = j;
 626                         match_level = 1;
 627                         /* FALL THROUGH */
 628                 case 1:
 629                         if (!unchanged_file(cmpbuf, file, stp))
 630                                 continue;
 631                         best_match = j;
 632                         match_level = 2;
 633                         /* FALL THROUGH */
 634                 case 2:
 635                         if (!unchanged_attrs(file, stp))
 636                                 continue;
 637                         if (always_checksum
 638                          && cmp_time(stp->st_mtime, file->modtime))
 639                                 continue;
 640                         best_match = j;
 641                         match_level = 3;
 642                         break;
 643                 }
 644                 break;
 645         } while (basis_dir[++j] != NULL);
 646
 647         ignore_times = save_ignore_times;
 648         size_only = save_size_only;
 649
 650         if (!match_level)
 651                 return -1;
 652
 653         if (j != best_match) {
 654                 j = best_match;
 655                 pathjoin(cmpbuf, MAXPATHLEN, basis_dir[j], fname);
 656                 if (link_stat(cmpbuf, stp, 0) < 0)
 657                         match_level = 0;
 658         }
 659
 660         if (match_level == 3 && !copy_dest) {
 661 #ifdef SUPPORT_HARD_LINKS
 662                 if (link_dest) {
 663                         if (hard_link_one(file, ndx, fname, 0, stp,
 664                                           cmpbuf, 1,
 665                                           itemizing && verbose > 1,
 666                                           code) < 0)
 667                                 goto try_a_copy;
 668                         if (preserve_hard_links && file->link_u.links)
 669                                 hard_link_cluster(file, ndx, itemizing, code);
 670                 } else
 671 #endif
 672                 if (itemizing)
 673                         itemize(file, ndx, 0, stp, 0, 0, NULL);
 674                 if (verbose > 1 && maybe_ATTRS_REPORT) {
 675                         code = logfile_format_has_i || dry_run
 676                              ? FCLIENT : FINFO;
 677                         rprintf(code, "%s is uptodate\n", fname);
 678                 }
 679                 return -2;
 680         }
 681
 682         if (match_level >= 2) {
 683           try_a_copy: /* Copy the file locally. */
 684                 if (copy_file(cmpbuf, fname, file->mode) < 0) {
 685                         if (verbose) {
 686                                 rsyserr(FINFO, errno, "copy_file %s => %s",
 687                                         full_fname(cmpbuf), fname);
 688                         }
 689                         return -1;
 690                 }
 691                 if (itemizing)
 692                         itemize(file, ndx, 0, stp, ITEM_LOCAL_CHANGE, 0, NULL);
 693                 set_file_attrs(fname, file, NULL, 0);
 694                 if (maybe_ATTRS_REPORT
 695                  && ((!itemizing && verbose && match_level == 2)
 696                   || (verbose > 1 && match_level == 3))) {
 697                         code = logfile_format_has_i || dry_run
 698                              ? FCLIENT : FINFO;
 699                         rprintf(code, "%s%s\n", fname,
 700                                 match_level == 3 ? " is uptodate" : "");
 701                 }
 702                 if (preserve_hard_links && file->link_u.links)
 703                         hard_link_cluster(file, ndx, itemizing, code);
 704                 return -2;
 705         }
 706
 707         return FNAMECMP_BASIS_DIR_LOW + j;
 708 }
 709
 710 /* This is only called for non-regular files.  We return -2 if we've finished
 711  * handling the file, or -1 if no dest-linking occurred. */
 712 static int try_dests_non(struct file_struct *file, char *fname, int ndx,
 713                          int itemizing, int maybe_ATTRS_REPORT,
 714                          enum logcode code)
 715 {
 716         char fnamebuf[MAXPATHLEN];
 717         STRUCT_STAT st;
 718         int i = 0;
 719
 720         do {
 721                 pathjoin(fnamebuf, MAXPATHLEN, basis_dir[i], fname);
 722                 if (link_stat(fnamebuf, &st, 0) < 0 || S_ISDIR(st.st_mode)
 723                  || !unchanged_attrs(file, &st))
 724                         continue;
 725                 if (S_ISLNK(file->mode)) {
 726 #ifdef SUPPORT_LINKS
 727                         char lnk[MAXPATHLEN];
 728                         int len;
 729                         if ((len = readlink(fnamebuf, lnk, MAXPATHLEN-1)) <= 0)
 730                                 continue;
 731                         lnk[len] = '\0';
 732                         if (strcmp(lnk, file->u.link) != 0)
 733 #endif
 734                                 continue;
 735                 } else if (IS_SPECIAL(file->mode)) {
 736                         if (!IS_SPECIAL(st.st_mode) || st.st_rdev != file->u.rdev)
 737                                 continue;
 738                 } else if (IS_DEVICE(file->mode)) {
 739                         if (!IS_DEVICE(st.st_mode) || st.st_rdev != file->u.rdev)
 740                                 continue;
 741                 } else {
 742                         rprintf(FERROR,
 743                                 "internal: try_dests_non() called with invalid mode (%o)\n",
 744                                 (int)file->mode);
 745                         exit_cleanup(RERR_UNSUPPORTED);
 746                 }
 747 #ifdef SUPPORT_HARD_LINKS
 748                 if (link_dest
 749 #ifndef CAN_HARDLINK_SYMLINK
 750                  && !S_ISLNK(file->mode)
 751 #endif
 752 #ifndef CAN_HARDLINK_SPECIAL
 753                  && !IS_SPECIAL(file->mode) && !IS_DEVICE(file->mode)
 754 #endif
 755                 ) {
 756                         if (do_link(fnamebuf, fname) < 0) {
 757                                 rsyserr(FERROR, errno,
 758                                         "failed to hard-link %s with %s",
 759                                         fnamebuf, fname);
 760                                 break;
 761                         }
 762                         if (preserve_hard_links && file->link_u.links)
 763                                 hard_link_cluster(file, ndx, itemizing, code);
 764                 }
 765 #endif
 766                 if (itemizing && log_format_has_i && verbose > 1) {
 767                         int changes = compare_dest ? 0 : ITEM_LOCAL_CHANGE
 768                                     + (link_dest ? ITEM_XNAME_FOLLOWS : 0);
 769                         char *lp = link_dest ? "" : NULL;
 770                         itemize(file, ndx, 0, &st, changes, 0, lp);
 771                 }
 772                 if (verbose > 1 && maybe_ATTRS_REPORT) {
 773                         code = logfile_format_has_i || dry_run
 774                              ? FCLIENT : FINFO;
 775                         rprintf(code, "%s is uptodate\n", fname);
 776                 }
 777                 return -2;
 778         } while (basis_dir[++i] != NULL);
 779
 780         return -1;
 781 }
 782
 783 static int phase = 0;
 784
 785 /* Acts on the_file_list->file's ndx'th item, whose name is fname.  If a dir,
 786  * make sure it exists, and has the right permissions/timestamp info.  For
 787  * all other non-regular files (symlinks, etc.) we create them here.  For
 788  * regular files that have changed, we try to find a basis file and then
 789  * start sending checksums.
 790  *
 791  * When fname is non-null, it must point to a MAXPATHLEN buffer!
 792  *
 793  * Note that f_out is set to -1 when doing final directory-permission and
 794  * modification-time repair. */
 795 static void recv_generator(char *fname, struct file_struct *file, int ndx,
 796                            int itemizing, int maybe_ATTRS_REPORT,
 797                            enum logcode code, int f_out)
 798 {
 799         static int missing_below = -1, excluded_below = -1;
 800         static char *parent_dirname = "";
 801         static struct file_list *fuzzy_dirlist = NULL;
 802         static int need_fuzzy_dirlist = 0;
 803         struct file_struct *fuzzy_file = NULL;
 804         int fd = -1, f_copy = -1;
 805         STRUCT_STAT st, real_st, partial_st;
 806         struct file_struct *back_file = NULL;
 807         int statret, real_ret, stat_errno;
 808         char *fnamecmp, *partialptr, *backupptr = NULL;
 809         char fnamecmpbuf[MAXPATHLEN];
 810         uchar fnamecmp_type;
 811         int del_opts = DEL_TERSE | (delete_mode ? DEL_FORCE_RECURSE : 0);
 812
 813         if (list_only)
 814                 return;
 815
 816         if (!fname) {
 817                 if (fuzzy_dirlist) {
 818                         flist_free(fuzzy_dirlist);
 819                         fuzzy_dirlist = NULL;
 820                 }
 821                 if (missing_below >= 0) {
 822                         dry_run--;
 823                         missing_below = -1;
 824                 }
 825                 parent_dirname = "";
 826                 return;
 827         }
 828
 829         if (verbose > 2)
 830                 rprintf(FINFO, "recv_generator(%s,%d)\n", fname, ndx);
 831
 832         if (server_filter_list.head) {
 833                 if (excluded_below >= 0) {
 834                         if (file->dir.depth > excluded_below)
 835                                 goto skipping;
 836                         excluded_below = -1;
 837                 }
 838                 if (check_filter(&server_filter_list, fname,
 839                                  S_ISDIR(file->mode)) < 0) {
 840                         if (S_ISDIR(file->mode))
 841                                 excluded_below = file->dir.depth;
 842                   skipping:
 843                         if (verbose) {
 844                                 rprintf(FINFO,
 845                                         "skipping server-excluded file \"%s\"\n",
 846                                         fname);
 847                         }
 848                         return;
 849                 }
 850         }
 851
 852         if (missing_below >= 0 && file->dir.depth <= missing_below) {
 853                 dry_run--;
 854                 missing_below = -1;
 855         }
 856         if (dry_run > 1) {
 857                 statret = -1;
 858                 stat_errno = ENOENT;
 859         } else {
 860                 char *dn = file->dirname ? file->dirname : ".";
 861                 if (parent_dirname != dn && strcmp(parent_dirname, dn) != 0) {
 862                         if (relative_paths && !implied_dirs
 863                          && safe_stat(dn, &st) < 0
 864                          && create_directory_path(fname) < 0) {
 865                                 rsyserr(FERROR, errno,
 866                                         "recv_generator: mkdir %s failed",
 867                                         full_fname(dn));
 868                         }
 869                         if (fuzzy_dirlist) {
 870                                 flist_free(fuzzy_dirlist);
 871                                 fuzzy_dirlist = NULL;
 872                         }
 873                         if (fuzzy_basis)
 874                                 need_fuzzy_dirlist = 1;
 875                 }
 876                 parent_dirname = dn;
 877
 878                 if (need_fuzzy_dirlist && S_ISREG(file->mode)) {
 879                         fuzzy_dirlist = get_dirlist(dn, -1, 1);
 880                         need_fuzzy_dirlist = 0;
 881                 }
 882
 883                 statret = link_stat(fname, &st,
 884                                     keep_dirlinks && S_ISDIR(file->mode));
 885                 stat_errno = errno;
 886         }
 887
 888         if (ignore_non_existing && statret == -1 && stat_errno == ENOENT) {
 889                 if (verbose > 1) {
 890                         rprintf(FINFO, "not creating new %s \"%s\"\n",
 891                                 S_ISDIR(file->mode) ? "directory" : "file",
 892                                 fname);
 893                 }
 894                 return;
 895         }
 896
 897         /* If we're not preserving permissions, change the file-list's
 898          * mode based on the local permissions and some heuristics. */
 899         if (!preserve_perms) {
 900                 int exists = statret == 0
 901                           && S_ISDIR(st.st_mode) == S_ISDIR(file->mode);
 902                 file->mode = dest_mode(file->mode, st.st_mode, exists);
 903         }
 904
 905         if (S_ISDIR(file->mode)) {
 906                 /* The file to be received is a directory, so we need
 907                  * to prepare appropriately.  If there is already a
 908                  * file of that name and it is *not* a directory, then
 909                  * we need to delete it.  If it doesn't exist, then
 910                  * (perhaps recursively) create it. */
 911                 if (statret == 0 && !S_ISDIR(st.st_mode)) {
 912                         if (delete_item(fname, st.st_mode, del_opts) < 0)
 913                                 return;
 914                         statret = -1;
 915                 }
 916                 if (dry_run && statret != 0 && missing_below < 0) {
 917                         missing_below = file->dir.depth;
 918                         dry_run++;
 919                 }
 920                 if (itemizing && f_out != -1) {
 921                         itemize(file, ndx, statret, &st,
 922                                 statret ? ITEM_LOCAL_CHANGE : 0, 0, NULL);
 923                 }
 924                 if (statret != 0 && do_mkdir(fname,file->mode) < 0 && errno != EEXIST) {
 925                         if (!relative_paths || errno != ENOENT
 926                             || create_directory_path(fname) < 0
 927                             || (do_mkdir(fname, file->mode) < 0 && errno != EEXIST)) {
 928                                 rsyserr(FERROR, errno,
 929                                         "recv_generator: mkdir %s failed",
 930                                         full_fname(fname));
 931                         }
 932                 }
 933                 if (set_file_attrs(fname, file, statret ? NULL : &st, 0)
 934                     && verbose && code && f_out != -1)
 935                         rprintf(code, "%s/\n", fname);
 936                 if (delete_during && f_out != -1 && !phase && dry_run < 2
 937                     && (file->flags & FLAG_DEL_HERE))
 938                         delete_in_dir(the_file_list, fname, file, &st);
 939                 return;
 940         }
 941
 942         if (preserve_hard_links && file->link_u.links
 943             && hard_link_check(file, ndx, fname, statret, &st,
 944                                itemizing, code, HL_CHECK_MASTER))
 945                 return;
 946
 947         if (preserve_links && S_ISLNK(file->mode)) {
 948 #ifdef SUPPORT_LINKS
 949                 if (safe_symlinks && unsafe_symlink(file->u.link, fname)) {
 950                         if (verbose) {
 951                                 if (the_file_list->count == 1)
 952                                         fname = f_name(file, NULL);
 953                                 rprintf(FINFO,
 954                                         "ignoring unsafe symlink %s -> \"%s\"\n",
 955                                         full_fname(fname), file->u.link);
 956                         }
 957                         return;
 958                 }
 959                 if (statret == 0) {
 960                         char lnk[MAXPATHLEN];
 961                         int len;
 962
 963                         if (!S_ISDIR(st.st_mode)
 964                             && (len = readlink(fname, lnk, MAXPATHLEN-1)) > 0) {
 965                                 lnk[len] = 0;
 966                                 /* A link already pointing to the
 967                                  * right place -- no further action
 968                                  * required. */
 969                                 if (strcmp(lnk, file->u.link) == 0) {
 970                                         if (itemizing) {
 971                                                 itemize(file, ndx, 0, &st, 0,
 972                                                         0, NULL);
 973                                         }
 974                                         set_file_attrs(fname, file, &st,
 975                                                        maybe_ATTRS_REPORT);
 976                                         if (preserve_hard_links
 977                                             && file->link_u.links) {
 978                                                 hard_link_cluster(file, ndx,
 979                                                                   itemizing,
 980                                                                   code);
 981                                         }
 982                                         return;
 983                                 }
 984                         }
 985                         /* Not the right symlink (or not a symlink), so
 986                          * delete it. */
 987                         if (delete_item(fname, st.st_mode, del_opts) < 0)
 988                                 return;
 989                         if (!S_ISLNK(st.st_mode))
 990                                 statret = -1;
 991                 } else if (basis_dir[0] != NULL) {
 992                         if (try_dests_non(file, fname, ndx, itemizing,
 993                                           maybe_ATTRS_REPORT, code) == -2) {
 994 #ifndef CAN_HARDLINK_SYMLINK
 995                                 if (link_dest) {
 996                                         /* Resort to --copy-dest behavior. */
 997                                 } else
 998 #endif
 999                                 if (!copy_dest)
1000                                         return;
1001                                 itemizing = code = 0;
1002                         }
1003                 }
1004                 if (preserve_hard_links && file->link_u.links
1005                     && hard_link_check(file, ndx, fname, -1, &st,
1006                                        itemizing, code, HL_SKIP))
1007                         return;
1008                 if (do_symlink(file->u.link,fname) != 0) {
1009                         rsyserr(FERROR, errno, "symlink %s -> \"%s\" failed",
1010                                 full_fname(fname), file->u.link);
1011                 } else {
1012                         set_file_attrs(fname, file, NULL, 0);
1013                         if (itemizing) {
1014                                 itemize(file, ndx, statret, &st,
1015                                         ITEM_LOCAL_CHANGE, 0, NULL);
1016                         }
1017                         if (code && verbose) {
1018                                 rprintf(code, "%s -> %s\n", fname,
1019                                         file->u.link);
1020                         }
1021                         if (remove_sent_files && !dry_run) {
1022                                 char numbuf[4];
1023                                 SIVAL(numbuf, 0, ndx);
1024                                 send_msg(MSG_SUCCESS, numbuf, 4);
1025                         }
1026                         if (preserve_hard_links && file->link_u.links)
1027                                 hard_link_cluster(file, ndx, itemizing, code);
1028                 }
1029 #endif
1030                 return;
1031         }
1032
1033         if ((am_root && preserve_devices && IS_DEVICE(file->mode))
1034          || (preserve_specials && IS_SPECIAL(file->mode))) {
1035                 if (statret != 0 && basis_dir[0] != NULL) {
1036                         if (try_dests_non(file, fname, ndx, itemizing,
1037                                           maybe_ATTRS_REPORT, code) == -2) {
1038 #ifndef CAN_HARDLINK_SPECIAL
1039                                 if (link_dest) {
1040                                         /* Resort to --copy-dest behavior. */
1041                                 } else
1042 #endif
1043                                 if (!copy_dest)
1044                                         return;
1045                                 itemizing = code = 0;
1046                         }
1047                 }
1048                 if (statret != 0
1049                  || (st.st_mode & ~CHMOD_BITS) != (file->mode & ~CHMOD_BITS)
1050                  || st.st_rdev != file->u.rdev) {
1051                         if (statret == 0
1052                          && delete_item(fname, st.st_mode, del_opts) < 0)
1053                                 return;
1054                         if (preserve_hard_links && file->link_u.links
1055                             && hard_link_check(file, ndx, fname, -1, &st,
1056                                                itemizing, code, HL_SKIP))
1057                                 return;
1058                         if ((IS_DEVICE(file->mode) && !IS_DEVICE(st.st_mode))
1059                          || (IS_SPECIAL(file->mode) && !IS_SPECIAL(st.st_mode)))
1060                                 statret = -1;
1061                         if (verbose > 2) {
1062                                 rprintf(FINFO,"mknod(%s,0%o,0x%x)\n",
1063                                         fname,
1064                                         (int)file->mode, (int)file->u.rdev);
1065                         }
1066                         if (do_mknod(fname,file->mode,file->u.rdev) < 0) {
1067                                 rsyserr(FERROR, errno, "mknod %s failed",
1068                                         full_fname(fname));
1069                         } else {
1070                                 set_file_attrs(fname, file, NULL, 0);
1071                                 if (itemizing) {
1072                                         itemize(file, ndx, statret, &st,
1073                                                 ITEM_LOCAL_CHANGE, 0, NULL);
1074                                 }
1075                                 if (code && verbose)
1076                                         rprintf(code, "%s\n", fname);
1077                                 if (preserve_hard_links && file->link_u.links) {
1078                                         hard_link_cluster(file, ndx,
1079                                                           itemizing, code);
1080                                 }
1081                         }
1082                 } else {
1083                         if (itemizing)
1084                                 itemize(file, ndx, statret, &st, 0, 0, NULL);
1085                         set_file_attrs(fname, file, &st, maybe_ATTRS_REPORT);
1086                         if (preserve_hard_links && file->link_u.links)
1087                                 hard_link_cluster(file, ndx, itemizing, code);
1088                 }
1089                 return;
1090         }
1091
1092         if (!S_ISREG(file->mode)) {
1093                 if (the_file_list->count == 1)
1094                         fname = f_name(file, NULL);
1095                 rprintf(FINFO, "skipping non-regular file \"%s\"\n", fname);
1096                 return;
1097         }
1098
1099         if (max_size && file->length > max_size) {
1100                 if (verbose > 1) {
1101                         if (the_file_list->count == 1)
1102                                 fname = f_name(file, NULL);
1103                         rprintf(FINFO, "%s is over max-size\n", fname);
1104                 }
1105                 return;
1106         }
1107         if (min_size && file->length < min_size) {
1108                 if (verbose > 1) {
1109                         if (the_file_list->count == 1)
1110                                 fname = f_name(file, NULL);
1111                         rprintf(FINFO, "%s is under min-size\n", fname);
1112                 }
1113                 return;
1114         }
1115
1116         if (ignore_existing && statret == 0) {
1117                 if (verbose > 1)
1118                         rprintf(FINFO, "%s exists\n", fname);
1119                 return;
1120         }
1121
1122         if (update_only && statret == 0
1123             && cmp_time(st.st_mtime, file->modtime) > 0) {
1124                 if (verbose > 1)
1125                         rprintf(FINFO, "%s is newer\n", fname);
1126                 return;
1127         }
1128
1129         fnamecmp = fname;
1130         fnamecmp_type = FNAMECMP_FNAME;
1131
1132         if (statret == 0 && !S_ISREG(st.st_mode)) {
1133                 if (delete_item(fname, st.st_mode, del_opts) != 0)
1134                         return;
1135                 statret = -1;
1136                 stat_errno = ENOENT;
1137         }
1138
1139         if (statret != 0 && basis_dir[0] != NULL) {
1140                 int j = try_dests_reg(file, fname, ndx, fnamecmpbuf, &st,
1141                                       itemizing, maybe_ATTRS_REPORT, code);
1142                 if (j == -2)
1143                         return;
1144                 if (j != -1) {
1145                         fnamecmp = fnamecmpbuf;
1146                         fnamecmp_type = j;
1147                         statret = 0;
1148                 }
1149         }
1150
1151         real_ret = statret;
1152         real_st = st;
1153
1154         if (partial_dir && (partialptr = partial_dir_fname(fname)) != NULL
1155             && link_stat(partialptr, &partial_st, 0) == 0
1156             && S_ISREG(partial_st.st_mode)) {
1157                 if (statret != 0)
1158                         goto prepare_to_open;
1159         } else
1160                 partialptr = NULL;
1161
1162         if (statret != 0 && fuzzy_dirlist && dry_run <= 1) {
1163                 int j = find_fuzzy(file, fuzzy_dirlist);
1164                 if (j >= 0) {
1165                         fuzzy_file = fuzzy_dirlist->files[j];
1166                         f_name(fuzzy_file, fnamecmpbuf);
1167                         if (verbose > 2) {
1168                                 rprintf(FINFO, "fuzzy basis selected for %s: %s\n",
1169                                         fname, fnamecmpbuf);
1170                         }
1171                         st.st_size = fuzzy_file->length;
1172                         statret = 0;
1173                         fnamecmp = fnamecmpbuf;
1174                         fnamecmp_type = FNAMECMP_FUZZY;
1175                 }
1176         }
1177
1178         if (statret != 0) {
1179                 if (preserve_hard_links && file->link_u.links
1180                     && hard_link_check(file, ndx, fname, statret, &st,
1181                                        itemizing, code, HL_SKIP))
1182                         return;
1183                 if (stat_errno == ENOENT)
1184                         goto notify_others;
1185                 rsyserr(FERROR, stat_errno, "recv_generator: failed to stat %s",
1186                         full_fname(fname));
1187                 return;
1188         }
1189
1190         if (append_mode && st.st_size > file->length)
1191                 return;
1192
1193         if (fnamecmp_type <= FNAMECMP_BASIS_DIR_HIGH)
1194                 ;
1195         else if (fnamecmp_type == FNAMECMP_FUZZY)
1196                 ;
1197         else if (unchanged_file(fnamecmp, file, &st)) {
1198                 if (partialptr) {
1199                         do_unlink(partialptr);
1200                         handle_partial_dir(partialptr, PDIR_DELETE);
1201                 }
1202                 if (itemizing) {
1203                         itemize(file, ndx, real_ret, &real_st,
1204                                 0, 0, NULL);
1205                 }
1206                 set_file_attrs(fname, file, &st, maybe_ATTRS_REPORT);
1207                 if (preserve_hard_links && file->link_u.links)
1208                         hard_link_cluster(file, ndx, itemizing, code);
1209                 return;
1210         }
1211
1212   prepare_to_open:
1213         if (partialptr) {
1214                 st = partial_st;
1215                 fnamecmp = partialptr;
1216                 fnamecmp_type = FNAMECMP_PARTIAL_DIR;
1217                 statret = 0;
1218         }
1219
1220         if (!do_xfers || read_batch || whole_file)
1221                 goto notify_others;
1222
1223         if (fuzzy_dirlist) {
1224                 int j = flist_find(fuzzy_dirlist, file);
1225                 if (j >= 0) /* don't use changing file as future fuzzy basis */
1226                         fuzzy_dirlist->files[j]->flags |= FLAG_NO_FUZZY;
1227         }
1228
1229         /* open the file */
1230         fd = do_open(fnamecmp, O_RDONLY, 0);
1231
1232         if (fd == -1) {
1233                 rsyserr(FERROR, errno, "failed to open %s, continuing",
1234                         full_fname(fnamecmp));
1235           pretend_missing:
1236                 /* pretend the file didn't exist */
1237                 if (preserve_hard_links && file->link_u.links
1238                     && hard_link_check(file, ndx, fname, statret, &st,
1239                                        itemizing, code, HL_SKIP))
1240                         return;
1241                 statret = real_ret = -1;
1242                 goto notify_others;
1243         }
1244
1245         if (inplace && make_backups && fnamecmp_type == FNAMECMP_FNAME) {
1246                 if (!(backupptr = get_backup_name(fname))) {
1247                         close(fd);
1248                         return;
1249                 }
1250                 if (!(back_file = make_file(fname, NULL, NULL, 0, NO_FILTERS))) {
1251                         close(fd);
1252                         goto pretend_missing;
1253                 }
1254                 if (robust_unlink(backupptr) && errno != ENOENT) {
1255                         rsyserr(FERROR, errno, "unlink %s",
1256                                 full_fname(backupptr));
1257                         free(back_file);
1258                         close(fd);
1259                         return;
1260                 }
1261                 if ((f_copy = do_open(backupptr,
1262                     O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0600)) < 0) {
1263                         rsyserr(FERROR, errno, "open %s",
1264                                 full_fname(backupptr));
1265                         free(back_file);
1266                         close(fd);
1267                         return;
1268                 }
1269                 fnamecmp_type = FNAMECMP_BACKUP;
1270         }
1271
1272         if (verbose > 3) {
1273                 rprintf(FINFO, "gen mapped %s of size %.0f\n",
1274                         fnamecmp, (double)st.st_size);
1275         }
1276
1277         if (verbose > 2)
1278                 rprintf(FINFO, "generating and sending sums for %d\n", ndx);
1279
1280   notify_others:
1281         if (remove_sent_files && !delay_updates && !phase)
1282             increment_active_files(ndx, itemizing, code);
1283         write_int(f_out, ndx);
1284         if (itemizing) {
1285                 int iflags = ITEM_TRANSFER;
1286                 if (always_checksum)
1287                         iflags |= ITEM_REPORT_CHECKSUM;
1288                 if (fnamecmp_type != FNAMECMP_FNAME)
1289                         iflags |= ITEM_BASIS_TYPE_FOLLOWS;
1290                 if (fnamecmp_type == FNAMECMP_FUZZY)
1291                         iflags |= ITEM_XNAME_FOLLOWS;
1292                 itemize(file, -1, real_ret, &real_st, iflags, fnamecmp_type,
1293                         fuzzy_file ? fuzzy_file->basename : NULL);
1294         }
1295
1296         if (!do_xfers) {
1297                 if (preserve_hard_links && file->link_u.links)
1298                         hard_link_cluster(file, ndx, itemizing, code);
1299                 return;
1300         }
1301         if (read_batch)
1302                 return;
1303
1304         if (statret != 0 || whole_file) {
1305                 write_sum_head(f_out, NULL);
1306                 return;
1307         }
1308
1309         generate_and_send_sums(fd, st.st_size, f_out, f_copy);
1310
1311         if (f_copy >= 0) {
1312                 close(f_copy);
1313                 set_file_attrs(backupptr, back_file, NULL, 0);
1314                 if (verbose > 1) {
1315                         rprintf(FINFO, "backed up %s to %s\n",
1316                                 fname, backupptr);
1317                 }
1318                 free(back_file);
1319         }
1320
1321         close(fd);
1322 }
1323
1324 void generate_files(int f_out, struct file_list *flist, char *local_name)
1325 {
1326         int i;
1327         char fbuf[MAXPATHLEN];
1328         int itemizing, maybe_ATTRS_REPORT;
1329         enum logcode code;
1330         int lull_mod = allowed_lull * 5;
1331         int need_retouch_dir_times = preserve_times && !omit_dir_times;
1332         int need_retouch_dir_perms = 0;
1333         int save_ignore_existing = ignore_existing;
1334         int save_ignore_non_existing = ignore_non_existing;
1335         int save_do_progress = do_progress;
1336         int save_make_backups = make_backups;
1337         int dir_tweaking = !(list_only || local_name || dry_run);
1338
1339         if (protocol_version >= 29) {
1340                 itemizing = 1;
1341                 maybe_ATTRS_REPORT = log_format_has_i ? 0 : ATTRS_REPORT;
1342                 code = logfile_format_has_i ? 0 : FLOG;
1343         } else if (am_daemon) {
1344                 itemizing = logfile_format_has_i && do_xfers;
1345                 maybe_ATTRS_REPORT = ATTRS_REPORT;
1346                 code = itemizing || !do_xfers ? FCLIENT : FINFO;
1347         } else if (!am_server) {
1348                 itemizing = log_format_has_i;
1349                 maybe_ATTRS_REPORT = log_format_has_i ? 0 : ATTRS_REPORT;
1350                 code = itemizing ? 0 : FINFO;
1351         } else {
1352                 itemizing = 0;
1353                 maybe_ATTRS_REPORT = ATTRS_REPORT;
1354                 code = FINFO;
1355         }
1356
1357         if (verbose > 2) {
1358                 rprintf(FINFO, "generator starting pid=%ld count=%d\n",
1359                         (long)getpid(), flist->count);
1360         }
1361
1362         if (delete_before && !local_name && flist->count > 0)
1363                 do_delete_pass(flist);
1364         do_progress = 0;
1365
1366         if (append_mode || whole_file < 0)
1367                 whole_file = 0;
1368         if (verbose >= 2) {
1369                 rprintf(FINFO, "delta-transmission %s\n",
1370                         whole_file
1371                         ? "disabled for local transfer or --whole-file"
1372                         : "enabled");
1373         }
1374
1375         /* Since we often fill up the outgoing socket and then just sit around
1376          * waiting for the other 2 processes to do their thing, we don't want
1377          * to exit on a timeout.  If the data stops flowing, the receiver will
1378          * notice that and let us know via the redo pipe (or its closing). */
1379         ignore_timeout = 1;
1380
1381         for (i = 0; i < flist->count; i++) {
1382                 struct file_struct *file = flist->files[i];
1383
1384                 if (!file->basename)
1385                         continue;
1386
1387                 if (local_name)
1388                         strlcpy(fbuf, local_name, sizeof fbuf);
1389                 else
1390                         f_name(file, fbuf);
1391                 recv_generator(fbuf, file, i, itemizing, maybe_ATTRS_REPORT,
1392                                code, f_out);
1393
1394                 /* We need to ensure that any dirs we create have writeable
1395                  * permissions during the time we are putting files within
1396                  * them.  This is then fixed after the transfer is done. */
1397 #ifdef HAVE_CHMOD
1398                 if (!am_root && S_ISDIR(file->mode) && !(file->mode & S_IWUSR)
1399                  && dir_tweaking) {
1400                         mode_t mode = file->mode | S_IWUSR; /* user write */
1401                         char *fname = local_name ? local_name : fbuf;
1402                         if (do_chmod(fname, mode) < 0) {
1403                                 rsyserr(FERROR, errno,
1404                                         "failed to modify permissions on %s",
1405                                         full_fname(fname));
1406                         }
1407                         need_retouch_dir_perms = 1;
1408                 }
1409 #endif
1410
1411                 if (preserve_hard_links)
1412                         check_for_finished_hlinks(itemizing, code);
1413
1414                 if (allowed_lull && !(i % lull_mod))
1415                         maybe_send_keepalive();
1416                 else if (!(i % 200))
1417                         maybe_flush_socket();
1418         }
1419         recv_generator(NULL, NULL, 0, 0, 0, code, -1);
1420         if (delete_during)
1421                 delete_in_dir(NULL, NULL, NULL, NULL);
1422
1423         phase++;
1424         csum_length = SUM_LENGTH;
1425         max_size = min_size = ignore_existing = ignore_non_existing = 0;
1426         update_only = always_checksum = size_only = 0;
1427         ignore_times = 1;
1428         if (append_mode)  /* resend w/o append mode */
1429                 append_mode = -1; /* ... but only longer files */
1430         make_backups = 0; /* avoid a duplicate backup for inplace processing */
1431
1432         if (verbose > 2)
1433                 rprintf(FINFO,"generate_files phase=%d\n",phase);
1434
1435         write_int(f_out, -1);
1436
1437         /* files can cycle through the system more than once
1438          * to catch initial checksum errors */
1439         while ((i = get_redo_num(itemizing, code)) != -1) {
1440                 struct file_struct *file = flist->files[i];
1441                 if (local_name)
1442                         strlcpy(fbuf, local_name, sizeof fbuf);
1443                 else
1444                         f_name(file, fbuf);
1445                 recv_generator(fbuf, file, i, itemizing, maybe_ATTRS_REPORT,
1446                                code, f_out);
1447         }
1448
1449         phase++;
1450         ignore_non_existing = save_ignore_non_existing;
1451         ignore_existing = save_ignore_existing;
1452         make_backups = save_make_backups;
1453
1454         if (verbose > 2)
1455                 rprintf(FINFO,"generate_files phase=%d\n",phase);
1456
1457         write_int(f_out, -1);
1458         /* Reduce round-trip lag-time for a useless delay-updates phase. */
1459         if (protocol_version >= 29 && !delay_updates)
1460                 write_int(f_out, -1);
1461
1462         /* Read MSG_DONE for the redo phase (and any prior messages). */
1463         get_redo_num(itemizing, code);
1464
1465         if (protocol_version >= 29) {
1466                 phase++;
1467                 if (verbose > 2)
1468                         rprintf(FINFO, "generate_files phase=%d\n", phase);
1469                 if (delay_updates)
1470                         write_int(f_out, -1);
1471                 /* Read MSG_DONE for delay-updates phase & prior messages. */
1472                 get_redo_num(itemizing, code);
1473         }
1474
1475         do_progress = save_do_progress;
1476         if (delete_after && !local_name && flist->count > 0)
1477                 do_delete_pass(flist);
1478
1479         if ((need_retouch_dir_perms || need_retouch_dir_times) && dir_tweaking) {
1480                 int j = 0;
1481                 /* Now we need to fix any directory permissions that were
1482                  * modified during the transfer and/or re-set any tweaked
1483                  * modified-time values. */
1484                 for (i = 0; i < flist->count; i++) {
1485                         struct file_struct *file = flist->files[i];
1486
1487                         if (!file->basename || !S_ISDIR(file->mode))
1488                                 continue;
1489                         if (!need_retouch_dir_times && file->mode & S_IWUSR)
1490                                 continue;
1491                         recv_generator(f_name(file, NULL), file, i, itemizing,
1492                                        maybe_ATTRS_REPORT, code, -1);
1493                         if (allowed_lull && !(++j % lull_mod))
1494                                 maybe_send_keepalive();
1495                         else if (!(j % 200))
1496                                 maybe_flush_socket();
1497                 }
1498         }
1499         recv_generator(NULL, NULL, 0, 0, 0, code, -1);
1500
1501         if (max_delete > 0 && deletion_count > max_delete) {
1502                 rprintf(FINFO,
1503                         "Deletions stopped due to --max-delete limit (%d skipped)\n",
1504                         deletion_count - max_delete);
1505                 io_error |= IOERR_DEL_LIMIT;
1506         }
1507
1508         if (verbose > 2)
1509                 rprintf(FINFO,"generate_files finished\n");
1510 }