generator.c

   1 /* -*- c-file-style: "linux" -*-
   2
   3    rsync -- fast file replication program
   4
   5    Copyright (C) 1996-2000 by Andrew Tridgell
   6    Copyright (C) Paul Mackerras 1996
   7    Copyright (C) 2002 by Martin Pool <mbp@samba.org>
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 #include "rsync.h"
  25
  26 extern int verbose;
  27 extern int dry_run;
  28 extern int log_format_has_i;
  29 extern int log_format_has_o_or_i;
  30 extern int daemon_log_format_has_i;
  31 extern int am_root;
  32 extern int am_server;
  33 extern int am_daemon;
  34 extern int recurse;
  35 extern int relative_paths;
  36 extern int keep_dirlinks;
  37 extern int preserve_links;
  38 extern int preserve_devices;
  39 extern int preserve_hard_links;
  40 extern int preserve_perms;
  41 extern int preserve_uid;
  42 extern int preserve_gid;
  43 extern int preserve_times;
  44 extern int omit_dir_times;
  45 extern int delete_before;
  46 extern int delete_during;
  47 extern int delete_after;
  48 extern int module_id;
  49 extern int ignore_errors;
  50 extern int remove_sent_files;
  51 extern int update_only;
  52 extern int opt_ignore_existing;
  53 extern int inplace;
  54 extern int make_backups;
  55 extern int csum_length;
  56 extern int ignore_times;
  57 extern int size_only;
  58 extern OFF_T max_size;
  59 extern int io_timeout;
  60 extern int io_error;
  61 extern int sock_f_out;
  62 extern int ignore_timeout;
  63 extern int protocol_version;
  64 extern int fuzzy_basis;
  65 extern int always_checksum;
  66 extern char *partial_dir;
  67 extern char *basis_dir[];
  68 extern int compare_dest;
  69 extern int link_dest;
  70 extern int whole_file;
  71 extern int local_server;
  72 extern int list_only;
  73 extern int read_batch;
  74 extern int only_existing;
  75 extern int orig_umask;
  76 extern int safe_symlinks;
  77 extern long block_size; /* "long" because popt can't set an int32. */
  78 extern int max_delete;
  79 extern int force_delete;
  80 extern int one_file_system;
  81 extern struct stats stats;
  82 extern dev_t filesystem_dev;
  83 extern char *backup_dir;
  84 extern char *backup_suffix;
  85 extern int backup_suffix_len;
  86 extern struct file_list *the_file_list;
  87 extern struct filter_list_struct server_filter_list;
  88
  89 int allowed_lull = 0;
  90
  91 static int deletion_count = 0; /* used to implement --max-delete */
  92
  93
  94 static int is_backup_file(char *fn)
  95 {
  96         int k = strlen(fn) - backup_suffix_len;
  97         return k > 0 && strcmp(fn+k, backup_suffix) == 0;
  98 }
  99
 100
 101 /* Delete a file or directory.  If DEL_FORCE_RECURSE is set in the flags, or if
 102  * force_delete is set, this will delete recursively as long as DEL_NO_RECURSE
 103  * is not set in the flags. */
 104 static int delete_item(char *fname, int mode, int flags)
 105 {
 106         struct file_list *dirlist;
 107         char buf[MAXPATHLEN];
 108         int j, dlen, zap_dir, ok;
 109         void *save_filters;
 110
 111         if (max_delete && deletion_count >= max_delete)
 112                 return -1;
 113
 114         if (!S_ISDIR(mode)) {
 115                 if (make_backups && (backup_dir || !is_backup_file(fname)))
 116                         ok = make_backup(fname);
 117                 else
 118                         ok = robust_unlink(fname) == 0;
 119                 if (ok) {
 120                         if (!(flags & DEL_TERSE))
 121                                 log_delete(fname, mode);
 122                         deletion_count++;
 123                         return 0;
 124                 }
 125                 if (errno == ENOENT)
 126                         return 0;
 127                 rsyserr(FERROR, errno, "delete_file: unlink %s failed",
 128                         full_fname(fname));
 129                 return -1;
 130         }
 131
 132         zap_dir = (flags & DEL_FORCE_RECURSE || (force_delete && recurse))
 133                 && !(flags & DEL_NO_RECURSE);
 134         if (dry_run && zap_dir) {
 135                 ok = 0;
 136                 errno = ENOTEMPTY;
 137         } else if (make_backups && !backup_dir && !is_backup_file(fname)
 138             && !(flags & DEL_FORCE_RECURSE))
 139                 ok = make_backup(fname);
 140         else
 141                 ok = do_rmdir(fname) == 0;
 142         if (ok) {
 143                 if (!(flags & DEL_TERSE))
 144                         log_delete(fname, mode);
 145                 deletion_count++;
 146                 return 0;
 147         }
 148         if (errno == ENOENT)
 149                 return 0;
 150         if (!zap_dir || (errno != ENOTEMPTY && errno != EEXIST)) {
 151                 rsyserr(FERROR, errno, "delete_file: rmdir %s failed",
 152                         full_fname(fname));
 153                 return -1;
 154         }
 155         flags |= DEL_FORCE_RECURSE; /* mark subdir dels as not "in the way" */
 156
 157         dlen = strlcpy(buf, fname, MAXPATHLEN);
 158         save_filters = push_local_filters(buf, dlen);
 159
 160         dirlist = get_dirlist(buf, dlen, 0);
 161         for (j = dirlist->count; j--; ) {
 162                 struct file_struct *fp = dirlist->files[j];
 163
 164                 if (fp->flags & FLAG_MOUNT_POINT)
 165                         continue;
 166
 167                 f_name_to(fp, buf);
 168                 if (delete_item(buf, fp->mode, flags & ~DEL_TERSE) != 0) {
 169                         flist_free(dirlist);
 170                         return -1;
 171                 }
 172         }
 173         flist_free(dirlist);
 174
 175         pop_local_filters(save_filters);
 176
 177         if (max_delete && deletion_count >= max_delete)
 178                 return -1;
 179
 180         if (do_rmdir(fname) == 0) {
 181                 if (!(flags & DEL_TERSE))
 182                         log_delete(fname, mode);
 183                 deletion_count++;
 184         } else if (errno != ENOTEMPTY && errno != ENOENT) {
 185                 rsyserr(FERROR, errno, "delete_file: rmdir %s failed",
 186                         full_fname(fname));
 187                 return -1;
 188         }
 189
 190         return 0;
 191 }
 192
 193
 194 /* This function is used to implement per-directory deletion, and is used by
 195  * all the --delete-WHEN options.  Note that the fbuf pointer must point to a
 196  * MAXPATHLEN buffer with the name of the directory in it (the functions we
 197  * call will append names onto the end, but the old dir value will be restored
 198  * on exit). */
 199 static void delete_in_dir(struct file_list *flist, char *fbuf,
 200                           struct file_struct *file)
 201 {
 202         static int min_depth = MAXPATHLEN, cur_depth = -1;
 203         static void *filt_array[MAXPATHLEN/2+1];
 204         struct file_list *dirlist;
 205         char delbuf[MAXPATHLEN];
 206         STRUCT_STAT st;
 207         int dlen, i;
 208
 209         if (!flist) {
 210                 while (cur_depth >= min_depth)
 211                         pop_local_filters(filt_array[cur_depth--]);
 212                 min_depth = MAXPATHLEN;
 213                 cur_depth = -1;
 214                 return;
 215         }
 216
 217         if (verbose > 2)
 218                 rprintf(FINFO, "delete_in_dir(%s)\n", safe_fname(fbuf));
 219
 220         if (allowed_lull)
 221                 maybe_send_keepalive();
 222
 223         if (file->dir.depth >= MAXPATHLEN/2+1)
 224                 return; /* Impossible... */
 225
 226         if (max_delete && deletion_count >= max_delete)
 227                 return;
 228
 229         if (io_error && !(lp_ignore_errors(module_id) || ignore_errors)) {
 230                 rprintf(FINFO,
 231                         "IO error encountered -- skipping file deletion\n");
 232                 max_delete = -1; /* avoid duplicating the above warning */
 233                 return;
 234         }
 235
 236         while (cur_depth >= file->dir.depth && cur_depth >= min_depth)
 237                 pop_local_filters(filt_array[cur_depth--]);
 238         cur_depth = file->dir.depth;
 239         if (min_depth > cur_depth)
 240                 min_depth = cur_depth;
 241         dlen = strlen(fbuf);
 242         filt_array[cur_depth] = push_local_filters(fbuf, dlen);
 243
 244         if (link_stat(fbuf, &st, keep_dirlinks) < 0)
 245                 return;
 246
 247         if (one_file_system && file->flags & FLAG_TOP_DIR)
 248                 filesystem_dev = st.st_dev;
 249
 250         dirlist = get_dirlist(fbuf, dlen, 0);
 251
 252         /* If an item in dirlist is not found in flist, delete it
 253          * from the filesystem. */
 254         for (i = dirlist->count; i--; ) {
 255                 if (!dirlist->files[i]->basename)
 256                         continue;
 257                 if (flist_find(flist, dirlist->files[i]) < 0) {
 258                         int mode = dirlist->files[i]->mode;
 259                         f_name_to(dirlist->files[i], delbuf);
 260                         if (delete_item(delbuf, mode, DEL_FORCE_RECURSE) < 0)
 261                                 break;
 262                 }
 263         }
 264
 265         flist_free(dirlist);
 266 }
 267
 268 /* This deletes any files on the receiving side that are not present on the
 269  * sending side.  This is used by --delete-before and --delete-after. */
 270 static void do_delete_pass(struct file_list *flist)
 271 {
 272         char fbuf[MAXPATHLEN];
 273         int j;
 274
 275         for (j = 0; j < flist->count; j++) {
 276                 struct file_struct *file = flist->files[j];
 277
 278                 if (!(file->flags & FLAG_DEL_HERE))
 279                         continue;
 280
 281                 f_name_to(file, fbuf);
 282                 if (verbose > 1 && file->flags & FLAG_TOP_DIR)
 283                         rprintf(FINFO, "deleting in %s\n", safe_fname(fbuf));
 284
 285                 delete_in_dir(flist, fbuf, file);
 286         }
 287 }
 288
 289 static int unchanged_attrs(struct file_struct *file, STRUCT_STAT *st)
 290 {
 291         if (preserve_perms
 292          && (st->st_mode & CHMOD_BITS) != (file->mode & CHMOD_BITS))
 293                 return 0;
 294
 295         if (am_root && preserve_uid && st->st_uid != file->uid)
 296                 return 0;
 297
 298         if (preserve_gid && file->gid != GID_NONE && st->st_gid != file->gid)
 299                 return 0;
 300
 301         return 1;
 302 }
 303
 304
 305 void itemize(struct file_struct *file, int ndx, int statret, STRUCT_STAT *st,
 306              int32 iflags, char *hlink)
 307 {
 308         if (statret == 0) {
 309                 if (S_ISREG(file->mode) && file->length != st->st_size)
 310                         iflags |= ITEM_REPORT_SIZE;
 311                 if (!(iflags & ITEM_NO_DEST_AND_NO_UPDATE)) {
 312                         int keep_time = !preserve_times ? 0
 313                             : S_ISDIR(file->mode) ? !omit_dir_times
 314                             : !S_ISLNK(file->mode);
 315
 316                         if ((iflags & (ITEM_TRANSFER|ITEM_LOCAL_CHANGE) && !keep_time)
 317                             || (keep_time && file->modtime != st->st_mtime))
 318                                 iflags |= ITEM_REPORT_TIME;
 319                         if (preserve_perms && file->mode != st->st_mode)
 320                                 iflags |= ITEM_REPORT_PERMS;
 321                         if (preserve_uid && am_root && file->uid != st->st_uid)
 322                                 iflags |= ITEM_REPORT_OWNER;
 323                         if (preserve_gid && file->gid != GID_NONE
 324                             && st->st_gid != file->gid)
 325                                 iflags |= ITEM_REPORT_GROUP;
 326                 }
 327         } else {
 328                 iflags |= ITEM_IS_NEW;
 329                 if (!(iflags & (ITEM_HARD_LINKED|ITEM_LOCAL_CHANGE)))
 330                         iflags |= ITEM_TRANSFER;
 331         }
 332
 333         iflags &= 0xffff;
 334         if ((iflags & SIGNIFICANT_ITEM_FLAGS || verbose > 1
 335           || (hlink && *hlink)) && !read_batch) {
 336                 if (protocol_version >= 29) {
 337                         if (ndx >= 0)
 338                                 write_int(sock_f_out, ndx);
 339                         /* XXX Temorary compatibility hack */
 340                         if (iflags & (ITEM_TRANSFER|ITEM_LOCAL_CHANGE))
 341                                 iflags |= ITEM_REPORT_XATTRS; /* ITEM_UPDATE */
 342                         write_shortint(sock_f_out, iflags);
 343                         if (hlink)
 344                                 write_vstring(sock_f_out, hlink, strlen(hlink));
 345                 } else if (ndx >= 0)
 346                         log_item(file, &stats, iflags, hlink);
 347         }
 348 }
 349
 350
 351 /* Perform our quick-check heuristic for determining if a file is unchanged. */
 352 static int unchanged_file(char *fn, struct file_struct *file, STRUCT_STAT *st)
 353 {
 354         if (st->st_size != file->length)
 355                 return 0;
 356
 357         /* if always checksum is set then we use the checksum instead
 358            of the file time to determine whether to sync */
 359         if (always_checksum && S_ISREG(st->st_mode)) {
 360                 char sum[MD4_SUM_LENGTH];
 361                 file_checksum(fn, sum, st->st_size);
 362                 return memcmp(sum, file->u.sum, protocol_version < 21 ? 2
 363                                                         : MD4_SUM_LENGTH) == 0;
 364         }
 365
 366         if (size_only)
 367                 return 1;
 368
 369         if (ignore_times)
 370                 return 0;
 371
 372         return cmp_modtime(st->st_mtime, file->modtime) == 0;
 373 }
 374
 375
 376 /*
 377  * set (initialize) the size entries in the per-file sum_struct
 378  * calculating dynamic block and checksum sizes.
 379  *
 380  * This is only called from generate_and_send_sums() but is a separate
 381  * function to encapsulate the logic.
 382  *
 383  * The block size is a rounded square root of file length.
 384  *
 385  * The checksum size is determined according to:
 386  *     blocksum_bits = BLOCKSUM_EXP + 2*log2(file_len) - log2(block_len)
 387  * provided by Donovan Baarda which gives a probability of rsync
 388  * algorithm corrupting data and falling back using the whole md4
 389  * checksums.
 390  *
 391  * This might be made one of several selectable heuristics.
 392  */
 393 static void sum_sizes_sqroot(struct sum_struct *sum, int64 len)
 394 {
 395         int32 blength;
 396         int s2length;
 397
 398         if (block_size)
 399                 blength = block_size;
 400         else if (len <= BLOCK_SIZE * BLOCK_SIZE)
 401                 blength = BLOCK_SIZE;
 402         else {
 403                 int32 c;
 404                 int64 l;
 405                 int cnt;
 406                 for (c = 1, l = len, cnt = 0; l >>= 2; c <<= 1, cnt++) {}
 407                 if (cnt >= 31 || c >= MAX_BLOCK_SIZE)
 408                         blength = MAX_BLOCK_SIZE;
 409                 else {
 410                     blength = 0;
 411                     do {
 412                             blength |= c;
 413                             if (len < (int64)blength * blength)
 414                                     blength &= ~c;
 415                             c >>= 1;
 416                     } while (c >= 8);   /* round to multiple of 8 */
 417                     blength = MAX(blength, BLOCK_SIZE);
 418                 }
 419         }
 420
 421         if (protocol_version < 27) {
 422                 s2length = csum_length;
 423         } else if (csum_length == SUM_LENGTH) {
 424                 s2length = SUM_LENGTH;
 425         } else {
 426                 int32 c;
 427                 int64 l;
 428                 int b = BLOCKSUM_BIAS;
 429                 for (l = len; l >>= 1; b += 2) {}
 430                 for (c = blength; c >>= 1 && b; b--) {}
 431                 /* add a bit, subtract rollsum, round up. */
 432                 s2length = (b + 1 - 32 + 7) / 8; /* --optimize in compiler-- */
 433                 s2length = MAX(s2length, csum_length);
 434                 s2length = MIN(s2length, SUM_LENGTH);
 435         }
 436
 437         sum->flength    = len;
 438         sum->blength    = blength;
 439         sum->s2length   = s2length;
 440         sum->count      = (len + (blength - 1)) / blength;
 441         sum->remainder  = (len % blength);
 442
 443         if (sum->count && verbose > 2) {
 444                 rprintf(FINFO,
 445                         "count=%.0f rem=%ld blength=%ld s2length=%d flength=%.0f\n",
 446                         (double)sum->count, (long)sum->remainder, (long)sum->blength,
 447                         sum->s2length, (double)sum->flength);
 448         }
 449 }
 450
 451
 452 /*
 453  * Generate and send a stream of signatures/checksums that describe a buffer
 454  *
 455  * Generate approximately one checksum every block_len bytes.
 456  */
 457 static void generate_and_send_sums(int fd, OFF_T len, int f_out, int f_copy)
 458 {
 459         int32 i;
 460         struct map_struct *mapbuf;
 461         struct sum_struct sum;
 462         OFF_T offset = 0;
 463
 464         sum_sizes_sqroot(&sum, len);
 465
 466         if (len > 0)
 467                 mapbuf = map_file(fd, len, MAX_MAP_SIZE, sum.blength);
 468         else
 469                 mapbuf = NULL;
 470
 471         write_sum_head(f_out, &sum);
 472
 473         for (i = 0; i < sum.count; i++) {
 474                 int32 n1 = (int32)MIN(len, (OFF_T)sum.blength);
 475                 char *map = map_ptr(mapbuf, offset, n1);
 476                 uint32 sum1 = get_checksum1(map, n1);
 477                 char sum2[SUM_LENGTH];
 478
 479                 if (f_copy >= 0)
 480                         full_write(f_copy, map, n1);
 481
 482                 get_checksum2(map, n1, sum2);
 483
 484                 if (verbose > 3) {
 485                         rprintf(FINFO,
 486                                 "chunk[%.0f] offset=%.0f len=%ld sum1=%08lx\n",
 487                                 (double)i, (double)offset, (long)n1,
 488                                 (unsigned long)sum1);
 489                 }
 490                 write_int(f_out, sum1);
 491                 write_buf(f_out, sum2, sum.s2length);
 492                 len -= n1;
 493                 offset += n1;
 494         }
 495
 496         if (mapbuf)
 497                 unmap_file(mapbuf);
 498 }
 499
 500
 501 /* Try to find a filename in the same dir as "fname" with a similar name. */
 502 static int find_fuzzy(struct file_struct *file, struct file_list *dirlist)
 503 {
 504         int fname_len, fname_suf_len;
 505         const char *fname_suf, *fname = file->basename;
 506         uint32 lowest_dist = 0x7FFFFFFF;
 507         int j, lowest_j = -1;
 508
 509         fname_len = strlen(fname);
 510         fname_suf = find_filename_suffix(fname, fname_len, &fname_suf_len);
 511
 512         for (j = 0; j < dirlist->count; j++) {
 513                 struct file_struct *fp = dirlist->files[j];
 514                 const char *suf, *name;
 515                 int len, suf_len;
 516                 uint32 dist;
 517
 518                 if (!S_ISREG(fp->mode) || !fp->length
 519                     || fp->flags & FLAG_NO_FUZZY)
 520                         continue;
 521
 522                 name = fp->basename;
 523
 524                 if (fp->length == file->length
 525                     && fp->modtime == file->modtime) {
 526                         if (verbose > 4) {
 527                                 rprintf(FINFO,
 528                                         "fuzzy size/modtime match for %s\n",
 529                                         name);
 530                         }
 531                         return j;
 532                 }
 533
 534                 len = strlen(name);
 535                 suf = find_filename_suffix(name, len, &suf_len);
 536
 537                 dist = fuzzy_distance(name, len, fname, fname_len);
 538                 /* Add some extra weight to how well the suffixes match. */
 539                 dist += fuzzy_distance(suf, suf_len, fname_suf, fname_suf_len)
 540                       * 10;
 541                 if (verbose > 4) {
 542                         rprintf(FINFO, "fuzzy distance for %s = %d.%05d\n",
 543                                 name, (int)(dist>>16), (int)(dist&0xFFFF));
 544                 }
 545                 if (dist <= lowest_dist) {
 546                         lowest_dist = dist;
 547                         lowest_j = j;
 548                 }
 549         }
 550
 551         return lowest_j;
 552 }
 553
 554 void check_for_finished_hlinks(int itemizing, enum logcode code)
 555 {
 556         struct file_struct *file;
 557         int ndx;
 558
 559         while ((ndx = get_hlink_num()) != -1) {
 560                 if (ndx < 0 || ndx >= the_file_list->count)
 561                         continue;
 562
 563                 file = the_file_list->files[ndx];
 564                 if (!file->link_u.links)
 565                         continue;
 566
 567                 hard_link_cluster(file, ndx, itemizing, code);
 568         }
 569 }
 570
 571 /* Acts on the_file_list->file's ndx'th item, whose name is fname.  If a dir,
 572  * make sure it exists, and has the right permissions/timestamp info.  For
 573  * all other non-regular files (symlinks, etc.) we create them here.  For
 574  * regular files that have changed, we try to find a basis file and then
 575  * start sending checksums.
 576  *
 577  * Note that f_out is set to -1 when doing final directory-permission and
 578  * modification-time repair. */
 579 static void recv_generator(char *fname, struct file_struct *file, int ndx,
 580                            int itemizing, int maybe_PERMS_REPORT,
 581                            enum logcode code, int f_out, int f_out_name)
 582 {
 583         static int missing_below = -1, excluded_below = -1;
 584         static char *fuzzy_dirname = NULL;
 585         static struct file_list *fuzzy_dirlist = NULL;
 586         struct file_struct *fuzzy_file = NULL;
 587         int fd = -1, f_copy = -1;
 588         STRUCT_STAT st, partial_st;
 589         struct file_struct *back_file = NULL;
 590         int statret, stat_errno;
 591         char *fnamecmp, *partialptr, *backupptr = NULL;
 592         char fnamecmpbuf[MAXPATHLEN];
 593         uchar fnamecmp_type;
 594
 595         if (list_only)
 596                 return;
 597
 598         if (!fname) {
 599                 if (fuzzy_dirlist) {
 600                         flist_free(fuzzy_dirlist);
 601                         fuzzy_dirlist = NULL;
 602                         fuzzy_dirname = NULL;
 603                 }
 604                 if (missing_below >= 0) {
 605                         dry_run--;
 606                         missing_below = -1;
 607                 }
 608                 return;
 609         }
 610
 611         if (verbose > 2) {
 612                 rprintf(FINFO, "recv_generator(%s,%d)\n",
 613                         safe_fname(fname), ndx);
 614         }
 615
 616         if (server_filter_list.head) {
 617                 if (excluded_below >= 0) {
 618                         if (file->dir.depth > excluded_below)
 619                                 goto skipping;
 620                         excluded_below = -1;
 621                 }
 622                 if (check_filter(&server_filter_list, fname,
 623                                  S_ISDIR(file->mode)) < 0) {
 624                         if (S_ISDIR(file->mode))
 625                                 excluded_below = file->dir.depth;
 626                     skipping:
 627                         if (verbose) {
 628                                 rprintf(FINFO,
 629                                         "skipping server-excluded file \"%s\"\n",
 630                                         safe_fname(fname));
 631                         }
 632                         return;
 633                 }
 634         }
 635
 636         if (missing_below >= 0 && file->dir.depth <= missing_below) {
 637                 dry_run--;
 638                 missing_below = -1;
 639         }
 640         if (dry_run > 1) {
 641                 statret = -1;
 642                 stat_errno = ENOENT;
 643         } else {
 644                 if (fuzzy_basis && S_ISREG(file->mode)) {
 645                         char *dn = file->dirname ? file->dirname : ".";
 646                         /* Yes, identical dirnames are guaranteed to have
 647                          * identical pointers at this point. */
 648                         if (fuzzy_dirname != dn) {
 649                                 if (fuzzy_dirlist)
 650                                         flist_free(fuzzy_dirlist);
 651                                 fuzzy_dirname = dn;
 652                                 fuzzy_dirlist = get_dirlist(fuzzy_dirname, -1,
 653                                                             1);
 654                         }
 655                 }
 656
 657                 statret = link_stat(fname, &st,
 658                                     keep_dirlinks && S_ISDIR(file->mode));
 659                 stat_errno = errno;
 660         }
 661
 662         if (only_existing && statret == -1 && stat_errno == ENOENT) {
 663                 /* we only want to update existing files */
 664                 if (verbose > 1) {
 665                         rprintf(FINFO, "not creating new file \"%s\"\n",
 666                                 safe_fname(fname));
 667                 }
 668                 return;
 669         }
 670
 671         if (statret == 0 && !preserve_perms
 672             && S_ISDIR(st.st_mode) == S_ISDIR(file->mode)) {
 673                 /* if the file exists already and we aren't perserving
 674                  * permissions then act as though the remote end sent
 675                  * us the file permissions we already have */
 676                 file->mode = (file->mode & ~CHMOD_BITS)
 677                            | (st.st_mode & CHMOD_BITS);
 678         }
 679
 680         if (S_ISDIR(file->mode)) {
 681                 /* The file to be received is a directory, so we need
 682                  * to prepare appropriately.  If there is already a
 683                  * file of that name and it is *not* a directory, then
 684                  * we need to delete it.  If it doesn't exist, then
 685                  * (perhaps recursively) create it. */
 686                 if (statret == 0 && !S_ISDIR(st.st_mode)) {
 687                         delete_item(fname, st.st_mode, DEL_TERSE);
 688                         statret = -1;
 689                 }
 690                 if (dry_run && statret != 0 && missing_below < 0) {
 691                         missing_below = file->dir.depth;
 692                         dry_run++;
 693                 }
 694                 if (itemizing && f_out != -1) {
 695                         itemize(file, ndx, statret, &st,
 696                                 statret ? ITEM_LOCAL_CHANGE : 0, NULL);
 697                 }
 698                 if (statret != 0 && do_mkdir(fname,file->mode) != 0 && errno != EEXIST) {
 699                         if (!relative_paths || errno != ENOENT
 700                             || create_directory_path(fname, orig_umask) < 0
 701                             || do_mkdir(fname, file->mode) < 0) {
 702                                 rsyserr(FERROR, errno,
 703                                         "recv_generator: mkdir %s failed",
 704                                         full_fname(fname));
 705                         }
 706                 }
 707                 if (set_perms(fname, file, statret ? NULL : &st, 0)
 708                     && verbose && code && f_out != -1)
 709                         rprintf(code, "%s/\n", safe_fname(fname));
 710                 if (delete_during && f_out != -1 && csum_length != SUM_LENGTH
 711                     && (file->flags & FLAG_DEL_HERE))
 712                         delete_in_dir(the_file_list, fname, file);
 713                 return;
 714         }
 715
 716         if (max_size && file->length > max_size) {
 717                 if (verbose > 1) {
 718                         rprintf(FINFO, "%s is over max-size\n",
 719                                 safe_fname(fname));
 720                 }
 721                 return;
 722         }
 723
 724         if (preserve_links && S_ISLNK(file->mode)) {
 725 #ifdef SUPPORT_LINKS
 726                 if (safe_symlinks && unsafe_symlink(file->u.link, fname)) {
 727                         if (verbose) {
 728                                 rprintf(FINFO,
 729                                         "ignoring unsafe symlink %s -> \"%s\"\n",
 730                                         full_fname(fname),
 731                                         safe_fname(file->u.link));
 732                         }
 733                         return;
 734                 }
 735                 if (statret == 0) {
 736                         char lnk[MAXPATHLEN];
 737                         int len;
 738
 739                         if (!S_ISDIR(st.st_mode)
 740                             && (len = readlink(fname, lnk, MAXPATHLEN-1)) > 0) {
 741                                 lnk[len] = 0;
 742                                 /* A link already pointing to the
 743                                  * right place -- no further action
 744                                  * required. */
 745                                 if (strcmp(lnk, file->u.link) == 0) {
 746                                         if (itemizing) {
 747                                                 itemize(file, ndx, 0, &st, 0,
 748                                                         NULL);
 749                                         }
 750                                         set_perms(fname, file, &st,
 751                                                   maybe_PERMS_REPORT);
 752                                         return;
 753                                 }
 754                         }
 755                         /* Not the right symlink (or not a symlink), so
 756                          * delete it. */
 757                         if (S_ISLNK(st.st_mode))
 758                                 delete_item(fname, st.st_mode, DEL_TERSE);
 759                         else {
 760                                 delete_item(fname, st.st_mode, DEL_TERSE);
 761                                 statret = -1;
 762                         }
 763                 }
 764                 if (do_symlink(file->u.link,fname) != 0) {
 765                         rsyserr(FERROR, errno, "symlink %s -> \"%s\" failed",
 766                                 full_fname(fname), safe_fname(file->u.link));
 767                 } else {
 768                         set_perms(fname,file,NULL,0);
 769                         if (itemizing) {
 770                                 itemize(file, ndx, statret, &st,
 771                                         ITEM_LOCAL_CHANGE, NULL);
 772                         }
 773                         if (code && verbose) {
 774                                 rprintf(code, "%s -> %s\n", safe_fname(fname),
 775                                         safe_fname(file->u.link));
 776                         }
 777                         if (remove_sent_files && !dry_run) {
 778                                 char numbuf[4];
 779                                 SIVAL(numbuf, 0, ndx);
 780                                 send_msg(MSG_SUCCESS, numbuf, 4);
 781                         }
 782                 }
 783 #endif
 784                 return;
 785         }
 786
 787         if (am_root && preserve_devices && IS_DEVICE(file->mode)) {
 788                 if (statret != 0 ||
 789                     st.st_mode != file->mode ||
 790                     st.st_rdev != file->u.rdev) {
 791                         delete_item(fname, st.st_mode, DEL_TERSE);
 792                         if (!IS_DEVICE(st.st_mode))
 793                                 statret = -1;
 794                         if (verbose > 2) {
 795                                 rprintf(FINFO,"mknod(%s,0%o,0x%x)\n",
 796                                         safe_fname(fname),
 797                                         (int)file->mode, (int)file->u.rdev);
 798                         }
 799                         if (do_mknod(fname,file->mode,file->u.rdev) != 0) {
 800                                 rsyserr(FERROR, errno, "mknod %s failed",
 801                                         full_fname(fname));
 802                         } else {
 803                                 set_perms(fname,file,NULL,0);
 804                                 if (itemizing) {
 805                                         itemize(file, ndx, statret, &st,
 806                                                 ITEM_LOCAL_CHANGE, NULL);
 807                                 }
 808                                 if (code && verbose) {
 809                                         rprintf(code, "%s\n",
 810                                                 safe_fname(fname));
 811                                 }
 812                         }
 813                 } else {
 814                         if (itemizing)
 815                                 itemize(file, ndx, statret, &st, 0, NULL);
 816                         set_perms(fname, file, &st, maybe_PERMS_REPORT);
 817                 }
 818                 return;
 819         }
 820
 821         if (preserve_hard_links && hard_link_check(file, ndx, HL_CHECK_MASTER))
 822                 return;
 823
 824         if (!S_ISREG(file->mode)) {
 825                 rprintf(FINFO, "skipping non-regular file \"%s\"\n",
 826                         safe_fname(fname));
 827                 return;
 828         }
 829
 830         if (opt_ignore_existing && statret == 0) {
 831                 if (verbose > 1)
 832                         rprintf(FINFO, "%s exists\n", safe_fname(fname));
 833                 return;
 834         }
 835
 836         if (update_only && statret == 0
 837             && cmp_modtime(st.st_mtime, file->modtime) > 0) {
 838                 if (verbose > 1)
 839                         rprintf(FINFO, "%s is newer\n", safe_fname(fname));
 840                 return;
 841         }
 842
 843         fnamecmp = fname;
 844         fnamecmp_type = FNAMECMP_FNAME;
 845
 846         if (statret != 0 && basis_dir[0] != NULL) {
 847                 int best_match = -1;
 848                 int match_level = 0;
 849                 int i = 0;
 850                 do {
 851                         pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 852                                  basis_dir[i], fname);
 853                         if (link_stat(fnamecmpbuf, &st, 0) < 0
 854                             || !S_ISREG(st.st_mode))
 855                                 continue;
 856                         switch (match_level) {
 857                         case 0:
 858                                 best_match = i;
 859                                 match_level = 1;
 860                                 /* FALL THROUGH */
 861                         case 1:
 862                                 if (!unchanged_file(fnamecmpbuf, file, &st))
 863                                         continue;
 864                                 best_match = i;
 865                                 match_level = 2;
 866                                 /* FALL THROUGH */
 867                         case 2:
 868                                 if (!unchanged_attrs(file, &st))
 869                                         continue;
 870                                 best_match = i;
 871                                 match_level = 3;
 872                                 break;
 873                         }
 874                         break;
 875                 } while (basis_dir[++i] != NULL);
 876                 if (match_level) {
 877                         statret = 0;
 878                         if (i != best_match) {
 879                                 i = best_match;
 880                                 pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 881                                          basis_dir[i], fname);
 882                                 if (link_stat(fnamecmpbuf, &st, 0) < 0) {
 883                                         match_level = 0;
 884                                         statret = -1;
 885                                         stat_errno = errno;
 886                                 }
 887                         }
 888 #ifdef HAVE_LINK
 889                         if (link_dest && match_level == 3) {
 890                                 if (hard_link_one(file, ndx, fname, -1, &st,
 891                                                   fnamecmpbuf, 1,
 892                                                   itemizing && verbose > 1,
 893                                                   code) == 0)
 894                                         return;
 895                                 if (verbose) {
 896                                         rsyserr(FINFO, errno, "link %s => %s",
 897                                                 full_fname(fnamecmpbuf),
 898                                                 safe_fname(fname));
 899                                 }
 900                                 match_level = 2;
 901                         }
 902 #endif
 903                         if (compare_dest || (match_level && match_level < 3)) {
 904                                 fnamecmp = fnamecmpbuf;
 905                                 fnamecmp_type = i;
 906                         }
 907                 }
 908         }
 909
 910         if (statret == 0 && !S_ISREG(st.st_mode)) {
 911                 if (delete_item(fname, st.st_mode, DEL_TERSE) != 0)
 912                         return;
 913                 statret = -1;
 914                 stat_errno = ENOENT;
 915         }
 916
 917         if (partial_dir && (partialptr = partial_dir_fname(fname)) != NULL
 918             && link_stat(partialptr, &partial_st, 0) == 0
 919             && S_ISREG(partial_st.st_mode)) {
 920                 if (statret != 0)
 921                         goto prepare_to_open;
 922         } else
 923                 partialptr = NULL;
 924
 925         if (statret != 0 && fuzzy_basis && dry_run <= 1) {
 926                 int j = find_fuzzy(file, fuzzy_dirlist);
 927                 if (j >= 0) {
 928                         fuzzy_file = fuzzy_dirlist->files[j];
 929                         f_name_to(fuzzy_file, fnamecmpbuf);
 930                         if (verbose > 2) {
 931                                 rprintf(FINFO, "fuzzy basis selected for %s: %s\n",
 932                                         safe_fname(fname), safe_fname(fnamecmpbuf));
 933                         }
 934                         st.st_mode = fuzzy_file->mode;
 935                         st.st_size = fuzzy_file->length;
 936                         st.st_mtime = fuzzy_file->modtime;
 937                         statret = 0;
 938                         fnamecmp = fnamecmpbuf;
 939                         fnamecmp_type = FNAMECMP_FUZZY;
 940                 }
 941         }
 942
 943         if (statret != 0) {
 944                 if (preserve_hard_links && hard_link_check(file, ndx, HL_SKIP))
 945                         return;
 946                 if (stat_errno == ENOENT)
 947                         goto notify_others;
 948                 if (verbose > 1) {
 949                         rsyserr(FERROR, stat_errno,
 950                                 "recv_generator: failed to stat %s",
 951                                 full_fname(fname));
 952                 }
 953                 return;
 954         }
 955
 956         if (!compare_dest && fnamecmp_type <= FNAMECMP_BASIS_DIR_HIGH)
 957                 ;
 958         else if (fnamecmp_type == FNAMECMP_FUZZY)
 959                 ;
 960         else if (unchanged_file(fnamecmp, file, &st)) {
 961                 if (fnamecmp_type == FNAMECMP_FNAME) {
 962                         if (itemizing)
 963                                 itemize(file, ndx, statret, &st, 0, NULL);
 964                         set_perms(fname, file, &st, maybe_PERMS_REPORT);
 965                         if (preserve_hard_links && file->link_u.links)
 966                                 hard_link_cluster(file, ndx, itemizing, code);
 967                         return;
 968                 }
 969                 /* Only --compare-dest gets here. */
 970                 if (unchanged_attrs(file, &st)) {
 971                         itemize(file, ndx, statret, &st,
 972                                 ITEM_NO_DEST_AND_NO_UPDATE, NULL);
 973                         return;
 974                 }
 975         }
 976
 977 prepare_to_open:
 978         if (partialptr) {
 979                 st = partial_st;
 980                 fnamecmp = partialptr;
 981                 fnamecmp_type = FNAMECMP_PARTIAL_DIR;
 982                 statret = 0;
 983         }
 984
 985         if (dry_run || read_batch || whole_file)
 986                 goto notify_others;
 987
 988         if (fuzzy_basis) {
 989                 int j = flist_find(fuzzy_dirlist, file);
 990                 if (j >= 0) /* don't use changing file as future fuzzy basis */
 991                         fuzzy_dirlist->files[j]->flags |= FLAG_NO_FUZZY;
 992         }
 993
 994         /* open the file */
 995         fd = do_open(fnamecmp, O_RDONLY, 0);
 996
 997         if (fd == -1) {
 998                 rsyserr(FERROR, errno, "failed to open %s, continuing",
 999                         full_fname(fnamecmp));
1000             pretend_missing:
1001                 /* pretend the file didn't exist */
1002                 if (preserve_hard_links && hard_link_check(file, ndx, HL_SKIP))
1003                         return;
1004                 statret = -1;
1005                 goto notify_others;
1006         }
1007
1008         if (inplace && make_backups) {
1009                 if (!(backupptr = get_backup_name(fname))) {
1010                         close(fd);
1011                         return;
1012                 }
1013                 if (!(back_file = make_file(fname, NULL, NO_FILTERS))) {
1014                         close(fd);
1015                         goto pretend_missing;
1016                 }
1017                 if (robust_unlink(backupptr) && errno != ENOENT) {
1018                         rsyserr(FERROR, errno, "unlink %s",
1019                                 full_fname(backupptr));
1020                         free(back_file);
1021                         close(fd);
1022                         return;
1023                 }
1024                 if ((f_copy = do_open(backupptr,
1025                     O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0600)) < 0) {
1026                         rsyserr(FERROR, errno, "open %s",
1027                                 full_fname(backupptr));
1028                         free(back_file);
1029                         close(fd);
1030                         return;
1031                 }
1032                 fnamecmp_type = FNAMECMP_BACKUP;
1033         }
1034
1035         if (verbose > 3) {
1036                 rprintf(FINFO, "gen mapped %s of size %.0f\n",
1037                         safe_fname(fnamecmp), (double)st.st_size);
1038         }
1039
1040         if (verbose > 2)
1041                 rprintf(FINFO, "generating and sending sums for %d\n", ndx);
1042
1043 notify_others:
1044         write_int(f_out, ndx);
1045         if (itemizing) {
1046                 int iflags = ITEM_TRANSFER;
1047                 if (always_checksum)
1048                         iflags |= ITEM_REPORT_CHECKSUM;
1049                 if (fnamecmp_type != FNAMECMP_FNAME)
1050                         iflags |= ITEM_USING_ALT_BASIS;
1051                 itemize(file, -1, statret, &st, iflags, NULL);
1052         }
1053         if (f_out_name >= 0) {
1054                 write_byte(f_out_name, fnamecmp_type);
1055                 if (fnamecmp_type == FNAMECMP_FUZZY) {
1056                         write_vstring(f_out_name, fuzzy_file->basename,
1057                                       strlen(fuzzy_file->basename));
1058                 }
1059         }
1060
1061         if (dry_run) {
1062                 if (preserve_hard_links && file->link_u.links)
1063                         hard_link_cluster(file, ndx, itemizing, code);
1064                 return;
1065         }
1066         if (read_batch)
1067                 return;
1068
1069         if (statret != 0 || whole_file) {
1070                 write_sum_head(f_out, NULL);
1071                 return;
1072         }
1073
1074         generate_and_send_sums(fd, st.st_size, f_out, f_copy);
1075
1076         if (f_copy >= 0) {
1077                 close(f_copy);
1078                 set_perms(backupptr, back_file, NULL, 0);
1079                 if (verbose > 1) {
1080                         rprintf(FINFO, "backed up %s to %s\n",
1081                                 safe_fname(fname), safe_fname(backupptr));
1082                 }
1083                 free(back_file);
1084         }
1085
1086         close(fd);
1087 }
1088
1089
1090 void generate_files(int f_out, struct file_list *flist, char *local_name,
1091                     int f_out_name)
1092 {
1093         int i, lull_mod;
1094         int phase = 0;
1095         char fbuf[MAXPATHLEN];
1096         int itemizing, maybe_PERMS_REPORT;
1097         enum logcode code;
1098         int need_retouch_dir_times = preserve_times && !omit_dir_times;
1099         int need_retouch_dir_perms = 0;
1100         int save_only_existing = only_existing;
1101         int save_opt_ignore_existing = opt_ignore_existing;
1102
1103         allowed_lull = read_batch ? 0 : (io_timeout + 1) / 2;
1104         lull_mod = allowed_lull * 5;
1105
1106         if (protocol_version >= 29) {
1107                 itemizing = 1;
1108                 maybe_PERMS_REPORT = log_format_has_i ? 0 : PERMS_REPORT;
1109                 code = daemon_log_format_has_i ? 0 : FLOG;
1110         } else if (am_daemon) {
1111                 itemizing = daemon_log_format_has_i && !dry_run;
1112                 maybe_PERMS_REPORT = PERMS_REPORT;
1113                 code = itemizing || dry_run ? FCLIENT : FINFO;
1114         } else if (!am_server) {
1115                 itemizing = log_format_has_i;
1116                 maybe_PERMS_REPORT = log_format_has_i ? 0 : PERMS_REPORT;
1117                 code = itemizing ? 0 : FINFO;
1118         } else {
1119                 itemizing = 0;
1120                 maybe_PERMS_REPORT = PERMS_REPORT;
1121                 code = FINFO;
1122         }
1123
1124         if (verbose > 2) {
1125                 rprintf(FINFO, "generator starting pid=%ld count=%d\n",
1126                         (long)getpid(), flist->count);
1127         }
1128
1129         if (delete_before && !local_name && flist->count > 0)
1130                 do_delete_pass(flist);
1131
1132         if (whole_file < 0)
1133                 whole_file = 0;
1134         if (verbose >= 2) {
1135                 rprintf(FINFO, "delta-transmission %s\n",
1136                         whole_file
1137                         ? "disabled for local transfer or --whole-file"
1138                         : "enabled");
1139         }
1140
1141         if (protocol_version < 29)
1142                 ignore_timeout = 1;
1143
1144         for (i = 0; i < flist->count; i++) {
1145                 struct file_struct *file = flist->files[i];
1146                 struct file_struct copy;
1147
1148                 if (!file->basename)
1149                         continue;
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                         copy = *file;
1156                         copy.mode |= S_IWUSR; /* user write */
1157                         file = &copy;
1158                         need_retouch_dir_perms = 1;
1159                 }
1160
1161                 recv_generator(local_name ? local_name : f_name_to(file, fbuf),
1162                                file, i, itemizing, maybe_PERMS_REPORT, code,
1163                                f_out, f_out_name);
1164                 if (preserve_hard_links)
1165                         check_for_finished_hlinks(itemizing, code);
1166
1167                 if (allowed_lull && !(i % lull_mod))
1168                         maybe_send_keepalive();
1169         }
1170         recv_generator(NULL, NULL, 0, 0, 0, code, -1, -1);
1171         if (delete_during)
1172                 delete_in_dir(NULL, NULL, NULL);
1173
1174         phase++;
1175         csum_length = SUM_LENGTH;
1176         only_existing = max_size = opt_ignore_existing = 0;
1177         update_only = always_checksum = size_only = 0;
1178         ignore_times = 1;
1179         make_backups = 0; /* avoid a duplicate backup for inplace processing */
1180
1181         /* We expect to just sit around now, so don't exit on a timeout.
1182          * If we really get a timeout then the other process should exit. */
1183         ignore_timeout = 1;
1184
1185         if (verbose > 2)
1186                 rprintf(FINFO,"generate_files phase=%d\n",phase);
1187
1188         write_int(f_out, -1);
1189
1190         /* files can cycle through the system more than once
1191          * to catch initial checksum errors */
1192         while ((i = get_redo_num(itemizing, code)) != -1) {
1193                 struct file_struct *file = flist->files[i];
1194                 recv_generator(local_name ? local_name : f_name_to(file, fbuf),
1195                                file, i, itemizing, maybe_PERMS_REPORT, code,
1196                                f_out, f_out_name);
1197         }
1198
1199         phase++;
1200         only_existing = save_only_existing;
1201         opt_ignore_existing = save_opt_ignore_existing;
1202
1203         if (verbose > 2)
1204                 rprintf(FINFO,"generate_files phase=%d\n",phase);
1205
1206         write_int(f_out, -1);
1207
1208         /* Read post-redo-phase MSG_DONE and any prior messages. */
1209         get_redo_num(itemizing, code);
1210
1211         if (delete_after && !local_name && flist->count > 0)
1212                 do_delete_pass(flist);
1213
1214         if ((need_retouch_dir_perms || need_retouch_dir_times)
1215             && !list_only && !local_name && !dry_run) {
1216                 int j = 0;
1217                 /* Now we need to fix any directory permissions that were
1218                  * modified during the transfer and/or re-set any tweaked
1219                  * modified-time values. */
1220                 for (i = 0; i < flist->count; i++) {
1221                         struct file_struct *file = flist->files[i];
1222                         if (!file->basename || !S_ISDIR(file->mode))
1223                                 continue;
1224                         if (!need_retouch_dir_times && file->mode & S_IWUSR)
1225                                 continue;
1226                         recv_generator(local_name ? local_name : f_name(file),
1227                                        file, i, itemizing, maybe_PERMS_REPORT,
1228                                        code, -1, -1);
1229                         if (allowed_lull && !(j++ % lull_mod))
1230                                 maybe_send_keepalive();
1231                 }
1232         }
1233         recv_generator(NULL, NULL, 0, 0, 0, code, -1, -1);
1234
1235         if (verbose > 2)
1236                 rprintf(FINFO,"generate_files finished\n");
1237 }