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 stdout_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 relative_paths;
  36 extern int implied_dirs;
  37 extern int keep_dirlinks;
  38 extern int preserve_links;
  39 extern int preserve_devices;
  40 extern int preserve_specials;
  41 extern int preserve_hard_links;
  42 extern int preserve_perms;
  43 extern int preserve_uid;
  44 extern int preserve_gid;
  45 extern int preserve_times;
  46 extern int omit_dir_times;
  47 extern int delete_mode;
  48 extern int delete_before;
  49 extern int delete_during;
  50 extern int delete_after;
  51 extern int module_id;
  52 extern int ignore_errors;
  53 extern int remove_source_files;
  54 extern int delay_updates;
  55 extern int update_only;
  56 extern int ignore_existing;
  57 extern int ignore_non_existing;
  58 extern int inplace;
  59 extern int append_mode;
  60 extern int make_backups;
  61 extern int csum_length;
  62 extern int ignore_times;
  63 extern int size_only;
  64 extern OFF_T max_size;
  65 extern OFF_T min_size;
  66 extern int io_error;
  67 extern int allowed_lull;
  68 extern int sock_f_out;
  69 extern int ignore_timeout;
  70 extern int protocol_version;
  71 extern int fuzzy_basis;
  72 extern int always_checksum;
  73 extern int checksum_len;
  74 extern char *partial_dir;
  75 extern char *basis_dir[];
  76 extern int compare_dest;
  77 extern int copy_dest;
  78 extern int link_dest;
  79 extern int whole_file;
  80 extern int list_only;
  81 extern int new_root_dir;
  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 int ignore_perishable = 0;
  97 int non_perishable_cnt = 0;
  98
  99 static int deletion_count = 0; /* used to implement --max-delete */
 100 static FILE *delete_delay_fp = NULL;
 101
 102 /* For calling delete_item() and delete_dir_contents(). */
 103 #define DEL_RECURSE             (1<<1) /* recurse */
 104 #define DEL_DIR_IS_EMPTY        (1<<2) /* internal delete_FUNCTIONS use only */
 105
 106 enum nonregtype {
 107     TYPE_DIR, TYPE_SPECIAL, TYPE_DEVICE, TYPE_SYMLINK
 108 };
 109
 110 enum delret {
 111     DR_SUCCESS = 0, DR_FAILURE, DR_AT_LIMIT, DR_NOT_EMPTY
 112 };
 113
 114 /* Forward declaration for delete_item(). */
 115 static enum delret delete_dir_contents(char *fname, int flags);
 116
 117
 118 static int is_backup_file(char *fn)
 119 {
 120         int k = strlen(fn) - backup_suffix_len;
 121         return k > 0 && strcmp(fn+k, backup_suffix) == 0;
 122 }
 123
 124 /* Delete a file or directory.  If DEL_RECURSE is set in the flags, this will
 125  * delete recursively.
 126  *
 127  * Note that fbuf must point to a MAXPATHLEN buffer if the mode indicates it's
 128  * a directory! (The buffer is used for recursion, but returned unchanged.)
 129  */
 130 static enum delret delete_item(char *fbuf, int mode, char *replace, int flags)
 131 {
 132         enum delret ret;
 133         char *what;
 134         int ok;
 135
 136         if (verbose > 2) {
 137                 rprintf(FINFO, "delete_item(%s) mode=%o flags=%d\n",
 138                         fbuf, mode, flags);
 139         }
 140
 141         if (S_ISDIR(mode) && !(flags & DEL_DIR_IS_EMPTY)) {
 142                 ignore_perishable = 1;
 143                 /* If DEL_RECURSE is not set, this just reports emptiness. */
 144                 ret = delete_dir_contents(fbuf, flags);
 145                 ignore_perishable = 0;
 146                 if (ret == DR_NOT_EMPTY || ret == DR_AT_LIMIT)
 147                         goto check_ret;
 148                 /* OK: try to delete the directory. */
 149         }
 150
 151         if (!replace && max_delete >= 0 && ++deletion_count > max_delete)
 152                 return DR_AT_LIMIT;
 153
 154         if (S_ISDIR(mode)) {
 155                 what = "rmdir";
 156                 ok = do_rmdir(fbuf) == 0;
 157         } else if (make_backups && (backup_dir || !is_backup_file(fbuf))) {
 158                 what = "make_backup";
 159                 ok = make_backup(fbuf);
 160         } else {
 161                 what = "unlink";
 162                 ok = robust_unlink(fbuf) == 0;
 163         }
 164
 165         if (ok) {
 166                 if (!replace)
 167                         log_delete(fbuf, mode);
 168                 ret = DR_SUCCESS;
 169         } else {
 170                 if (S_ISDIR(mode) && errno == ENOTEMPTY) {
 171                         rprintf(FINFO, "cannot delete non-empty directory: %s\n",
 172                                 fbuf);
 173                         ret = DR_NOT_EMPTY;
 174                 } else if (errno != ENOENT) {
 175                         rsyserr(FERROR, errno, "delete_file: %s(%s) failed",
 176                                 what, fbuf);
 177                         ret = DR_FAILURE;
 178                 } else {
 179                         deletion_count--;
 180                         ret = DR_SUCCESS;
 181                 }
 182         }
 183
 184   check_ret:
 185         if (replace && ret != DR_SUCCESS) {
 186                 rprintf(FERROR, "could not make way for new %s: %s\n",
 187                         replace, fbuf);
 188         }
 189         return ret;
 190 }
 191
 192 /* The directory is about to be deleted: if DEL_RECURSE is given, delete all
 193  * its contents, otherwise just checks for content.  Returns DR_SUCCESS or
 194  * DR_NOT_EMPTY.  Note that fname must point to a MAXPATHLEN buffer!  (The
 195  * buffer is used for recursion, but returned unchanged.)
 196  */
 197 static enum delret delete_dir_contents(char *fname, int flags)
 198 {
 199         struct file_list *dirlist;
 200         enum delret ret;
 201         unsigned remainder;
 202         void *save_filters;
 203         int j, dlen;
 204         char *p;
 205
 206         if (verbose > 3) {
 207                 rprintf(FINFO, "delete_dir_contents(%s) flags=%d\n",
 208                         fname, flags);
 209         }
 210
 211         dlen = strlen(fname);
 212         save_filters = push_local_filters(fname, dlen);
 213
 214         non_perishable_cnt = 0;
 215         dirlist = get_dirlist(fname, dlen, 0);
 216         ret = non_perishable_cnt ? DR_NOT_EMPTY : DR_SUCCESS;
 217
 218         if (!dirlist->count)
 219                 goto done;
 220
 221         if (!(flags & DEL_RECURSE)) {
 222                 ret = DR_NOT_EMPTY;
 223                 goto done;
 224         }
 225
 226         p = fname + dlen;
 227         if (dlen != 1 || *fname != '/')
 228                 *p++ = '/';
 229         remainder = MAXPATHLEN - (p - fname);
 230
 231         /* We do our own recursion, so make delete_item() non-recursive. */
 232         flags = (flags & ~DEL_RECURSE) | DEL_DIR_IS_EMPTY;
 233
 234         for (j = dirlist->count; j--; ) {
 235                 struct file_struct *fp = dirlist->files[j];
 236
 237                 if (fp->flags & FLAG_MOUNT_DIR) {
 238                         if (verbose > 1) {
 239                                 rprintf(FINFO,
 240                                     "mount point, %s, pins parent directory\n",
 241                                     f_name(fp, NULL));
 242                         }
 243                         ret = DR_NOT_EMPTY;
 244                         continue;
 245                 }
 246
 247                 strlcpy(p, F_BASENAME(fp), remainder);
 248                 /* Save stack by recursing to ourself directly. */
 249                 if (S_ISDIR(fp->mode)
 250                  && delete_dir_contents(fname, flags | DEL_RECURSE) != DR_SUCCESS)
 251                         ret = DR_NOT_EMPTY;
 252                 if (delete_item(fname, fp->mode, NULL, flags) != DR_SUCCESS)
 253                         ret = DR_NOT_EMPTY;
 254         }
 255
 256         fname[dlen] = '\0';
 257
 258   done:
 259         flist_free(dirlist);
 260         pop_local_filters(save_filters);
 261
 262         if (ret == DR_NOT_EMPTY) {
 263                 rprintf(FINFO, "cannot delete non-empty directory: %s\n",
 264                         fname);
 265         }
 266         return ret;
 267 }
 268
 269 static void start_delete_temp(void)
 270 {
 271         char fnametmp[MAXPATHLEN];
 272         int fd, save_dry_run = dry_run;
 273
 274         dry_run = 0;
 275         if (!get_tmpname(fnametmp, "deldelay")
 276          || (fd = do_mkstemp(fnametmp, 0600)) < 0
 277          || !(delete_delay_fp = fdopen(fd, "w+"))) {
 278                 rprintf(FERROR, "Unable to create delete-delay temp file.\n");
 279                 exit_cleanup(RERR_FILEIO);
 280         }
 281         dry_run = save_dry_run;
 282         unlink(fnametmp);
 283 }
 284
 285 static int read_delay_line(FILE *fp, char *buf, int bsize)
 286 {
 287         int ch, mode = 0;
 288
 289         if ((ch = fgetc(fp)) == EOF)
 290                 return -1;
 291
 292         while (1) {
 293                 if (ch == ' ')
 294                         break;
 295                 if (ch > '7' || ch < '0') {
 296                         rprintf(FERROR, "invalid data in delete-delay file.\n");
 297                         exit_cleanup(RERR_FILEIO);
 298                 }
 299                 mode = mode*8 + ch - '0';
 300                 if ((ch = fgetc(fp)) == EOF) {
 301                   unexpected_eof:
 302                         rprintf(FERROR, "unexpected EOF in delete-delay file.\n");
 303                         exit_cleanup(RERR_FILEIO);
 304                 }
 305         }
 306
 307         while (1) {
 308                 if ((ch = fgetc(fp)) == EOF)
 309                         goto unexpected_eof;
 310                 if (bsize-- <= 0) {
 311                         rprintf(FERROR, "filename too long in delete-delay file.\n");
 312                         exit_cleanup(RERR_FILEIO);
 313                 }
 314                 *buf++ = (char)ch;
 315                 if (ch == '\0')
 316                         break;
 317         }
 318
 319         return mode;
 320 }
 321
 322 static void delayed_deletions(char *delbuf)
 323 {
 324         int mode;
 325
 326         fseek(delete_delay_fp, 0, 0);
 327         while ((mode = read_delay_line(delete_delay_fp, delbuf, MAXPATHLEN)) >= 0)
 328                 delete_item(delbuf, mode, NULL, DEL_RECURSE);
 329         fclose(delete_delay_fp);
 330 }
 331
 332 /* This function is used to implement per-directory deletion, and is used by
 333  * all the --delete-WHEN options.  Note that the fbuf pointer must point to a
 334  * MAXPATHLEN buffer with the name of the directory in it (the functions we
 335  * call will append names onto the end, but the old dir value will be restored
 336  * on exit). */
 337 static void delete_in_dir(struct file_list *flist, char *fbuf,
 338                           struct file_struct *file, STRUCT_STAT *stp)
 339 {
 340         static int min_depth = MAXPATHLEN, cur_depth = -1;
 341         static void *filt_array[MAXPATHLEN/2+1];
 342         static int already_warned = 0;
 343         struct file_list *dirlist;
 344         char delbuf[MAXPATHLEN];
 345         int dlen, i;
 346
 347         if (!flist) {
 348                 while (cur_depth >= min_depth)
 349                         pop_local_filters(filt_array[cur_depth--]);
 350                 min_depth = MAXPATHLEN;
 351                 cur_depth = -1;
 352                 return;
 353         }
 354
 355         if (verbose > 2)
 356                 rprintf(FINFO, "delete_in_dir(%s)\n", fbuf);
 357
 358         if (allowed_lull)
 359                 maybe_send_keepalive();
 360
 361         if (file->dir.depth >= MAXPATHLEN/2+1)
 362                 return; /* Impossible... */
 363
 364         if (io_error && !(lp_ignore_errors(module_id) || ignore_errors)) {
 365                 if (already_warned)
 366                         return;
 367                 rprintf(FINFO,
 368                         "IO error encountered -- skipping file deletion\n");
 369                 already_warned = 1;
 370                 return;
 371         }
 372
 373         while (cur_depth >= file->dir.depth && cur_depth >= min_depth)
 374                 pop_local_filters(filt_array[cur_depth--]);
 375         cur_depth = file->dir.depth;
 376         if (min_depth > cur_depth)
 377                 min_depth = cur_depth;
 378         dlen = strlen(fbuf);
 379         filt_array[cur_depth] = push_local_filters(fbuf, dlen);
 380
 381         if (one_file_system) {
 382                 if (file->flags & FLAG_TOP_DIR)
 383                         filesystem_dev = stp->st_dev;
 384                 else if (filesystem_dev != stp->st_dev)
 385                         return;
 386         }
 387
 388         dirlist = get_dirlist(fbuf, dlen, 0);
 389
 390         /* If an item in dirlist is not found in flist, delete it
 391          * from the filesystem. */
 392         for (i = dirlist->count; i--; ) {
 393                 struct file_struct *fp = dirlist->files[i];
 394                 if (!F_IS_ACTIVE(fp))
 395                         continue;
 396                 if (fp->flags & FLAG_MOUNT_DIR) {
 397                         if (verbose > 1)
 398                                 rprintf(FINFO, "cannot delete mount point: %s\n",
 399                                         f_name(fp, NULL));
 400                         continue;
 401                 }
 402                 if (flist_find(flist, fp) < 0) {
 403                         f_name(fp, delbuf);
 404                         if (delete_delay_fp)
 405                                 fprintf(delete_delay_fp, "%o %s%c", (short)fp->mode, delbuf, '\0');
 406                         else
 407                                 delete_item(delbuf, fp->mode, NULL, DEL_RECURSE);
 408                 }
 409         }
 410
 411         flist_free(dirlist);
 412 }
 413
 414 /* This deletes any files on the receiving side that are not present on the
 415  * sending side.  This is used by --delete-before and --delete-after. */
 416 static void do_delete_pass(struct file_list *flist)
 417 {
 418         char fbuf[MAXPATHLEN];
 419         STRUCT_STAT st;
 420         int j;
 421
 422         /* dry_run is incremented when the destination doesn't exist yet. */
 423         if (dry_run > 1 || list_only)
 424                 return;
 425
 426         for (j = 0; j < flist->count; j++) {
 427                 struct file_struct *file = flist->files[j];
 428
 429                 if (!(file->flags & FLAG_XFER_DIR))
 430                         continue;
 431
 432                 f_name(file, fbuf);
 433                 if (verbose > 1 && file->flags & FLAG_TOP_DIR)
 434                         rprintf(FINFO, "deleting in %s\n", fbuf);
 435
 436                 if (link_stat(fbuf, &st, keep_dirlinks) < 0
 437                  || !S_ISDIR(st.st_mode))
 438                         continue;
 439
 440                 delete_in_dir(flist, fbuf, file, &st);
 441         }
 442         delete_in_dir(NULL, NULL, NULL, NULL);
 443
 444         if (do_progress && !am_server)
 445                 rprintf(FINFO, "                    \r");
 446 }
 447
 448 int unchanged_attrs(struct file_struct *file, STRUCT_STAT *st)
 449 {
 450         if (preserve_perms
 451          && (st->st_mode & CHMOD_BITS) != (file->mode & CHMOD_BITS))
 452                 return 0;
 453
 454         if (am_root && preserve_uid && st->st_uid != F_UID(file))
 455                 return 0;
 456
 457         if (preserve_gid && F_GID(file) != GID_NONE && st->st_gid != F_GID(file))
 458                 return 0;
 459
 460         return 1;
 461 }
 462
 463 void itemize(struct file_struct *file, int ndx, int statret, STRUCT_STAT *st,
 464              int32 iflags, uchar fnamecmp_type, const char *xname)
 465 {
 466         if (statret >= 0) { /* A from-dest-dir statret can == 1! */
 467                 int keep_time = !preserve_times ? 0
 468                     : S_ISDIR(file->mode) ? !omit_dir_times
 469                     : !S_ISLNK(file->mode);
 470
 471                 if (S_ISREG(file->mode) && F_LENGTH(file) != st->st_size)
 472                         iflags |= ITEM_REPORT_SIZE;
 473                 if ((iflags & (ITEM_TRANSFER|ITEM_LOCAL_CHANGE) && !keep_time
 474                   && !(iflags & ITEM_MATCHED)
 475                   && (!(iflags & ITEM_XNAME_FOLLOWS) || *xname))
 476                  || (keep_time && cmp_time(file->modtime, st->st_mtime) != 0))
 477                         iflags |= ITEM_REPORT_TIME;
 478                 if ((file->mode & CHMOD_BITS) != (st->st_mode & CHMOD_BITS))
 479                         iflags |= ITEM_REPORT_PERMS;
 480                 if (preserve_uid && am_root && F_UID(file) != st->st_uid)
 481                         iflags |= ITEM_REPORT_OWNER;
 482                 if (preserve_gid && F_GID(file) != GID_NONE
 483                     && st->st_gid != F_GID(file))
 484                         iflags |= ITEM_REPORT_GROUP;
 485         } else
 486                 iflags |= ITEM_IS_NEW;
 487
 488         iflags &= 0xffff;
 489         if ((iflags & SIGNIFICANT_ITEM_FLAGS || verbose > 1
 490           || stdout_format_has_i > 1 || (xname && *xname)) && !read_batch) {
 491                 if (protocol_version >= 29) {
 492                         if (ndx >= 0)
 493                                 write_int(sock_f_out, ndx);
 494                         write_shortint(sock_f_out, iflags);
 495                         if (iflags & ITEM_BASIS_TYPE_FOLLOWS)
 496                                 write_byte(sock_f_out, fnamecmp_type);
 497                         if (iflags & ITEM_XNAME_FOLLOWS)
 498                                 write_vstring(sock_f_out, xname, strlen(xname));
 499                 } else if (ndx >= 0) {
 500                         enum logcode code = logfile_format_has_i ? FINFO : FCLIENT;
 501                         log_item(code, file, &stats, iflags, xname);
 502                 }
 503         }
 504 }
 505
 506
 507 /* Perform our quick-check heuristic for determining if a file is unchanged. */
 508 int unchanged_file(char *fn, struct file_struct *file, STRUCT_STAT *st)
 509 {
 510         if (st->st_size != F_LENGTH(file))
 511                 return 0;
 512
 513         /* if always checksum is set then we use the checksum instead
 514            of the file time to determine whether to sync */
 515         if (always_checksum && S_ISREG(st->st_mode)) {
 516                 char sum[MD4_SUM_LENGTH];
 517                 file_checksum(fn, sum, st->st_size);
 518                 return memcmp(sum, F_SUM(file), checksum_len) == 0;
 519         }
 520
 521         if (size_only)
 522                 return 1;
 523
 524         if (ignore_times)
 525                 return 0;
 526
 527         return cmp_time(st->st_mtime, file->modtime) == 0;
 528 }
 529
 530
 531 /*
 532  * set (initialize) the size entries in the per-file sum_struct
 533  * calculating dynamic block and checksum sizes.
 534  *
 535  * This is only called from generate_and_send_sums() but is a separate
 536  * function to encapsulate the logic.
 537  *
 538  * The block size is a rounded square root of file length.
 539  *
 540  * The checksum size is determined according to:
 541  *     blocksum_bits = BLOCKSUM_BIAS + 2*log2(file_len) - log2(block_len)
 542  * provided by Donovan Baarda which gives a probability of rsync
 543  * algorithm corrupting data and falling back using the whole md4
 544  * checksums.
 545  *
 546  * This might be made one of several selectable heuristics.
 547  */
 548 static void sum_sizes_sqroot(struct sum_struct *sum, int64 len)
 549 {
 550         int32 blength;
 551         int s2length;
 552
 553         if (block_size)
 554                 blength = block_size;
 555         else if (len <= BLOCK_SIZE * BLOCK_SIZE)
 556                 blength = BLOCK_SIZE;
 557         else {
 558                 int32 c;
 559                 int64 l;
 560                 int cnt;
 561                 for (c = 1, l = len, cnt = 0; l >>= 2; c <<= 1, cnt++) {}
 562                 if (cnt >= 31 || c >= MAX_BLOCK_SIZE)
 563                         blength = MAX_BLOCK_SIZE;
 564                 else {
 565                     blength = 0;
 566                     do {
 567                             blength |= c;
 568                             if (len < (int64)blength * blength)
 569                                     blength &= ~c;
 570                             c >>= 1;
 571                     } while (c >= 8);   /* round to multiple of 8 */
 572                     blength = MAX(blength, BLOCK_SIZE);
 573                 }
 574         }
 575
 576         if (protocol_version < 27) {
 577                 s2length = csum_length;
 578         } else if (csum_length == SUM_LENGTH) {
 579                 s2length = SUM_LENGTH;
 580         } else {
 581                 int32 c;
 582                 int64 l;
 583                 int b = BLOCKSUM_BIAS;
 584                 for (l = len; l >>= 1; b += 2) {}
 585                 for (c = blength; (c >>= 1) && b; b--) {}
 586                 /* add a bit, subtract rollsum, round up. */
 587                 s2length = (b + 1 - 32 + 7) / 8; /* --optimize in compiler-- */
 588                 s2length = MAX(s2length, csum_length);
 589                 s2length = MIN(s2length, SUM_LENGTH);
 590         }
 591
 592         sum->flength    = len;
 593         sum->blength    = blength;
 594         sum->s2length   = s2length;
 595         sum->remainder  = (int32)(len % blength);
 596         sum->count      = (int32)(len / blength) + (sum->remainder != 0);
 597
 598         if (sum->count && verbose > 2) {
 599                 rprintf(FINFO,
 600                         "count=%.0f rem=%ld blength=%ld s2length=%d flength=%.0f\n",
 601                         (double)sum->count, (long)sum->remainder, (long)sum->blength,
 602                         sum->s2length, (double)sum->flength);
 603         }
 604 }
 605
 606
 607 /*
 608  * Generate and send a stream of signatures/checksums that describe a buffer
 609  *
 610  * Generate approximately one checksum every block_len bytes.
 611  */
 612 static void generate_and_send_sums(int fd, OFF_T len, int f_out, int f_copy)
 613 {
 614         int32 i;
 615         struct map_struct *mapbuf;
 616         struct sum_struct sum;
 617         OFF_T offset = 0;
 618
 619         sum_sizes_sqroot(&sum, len);
 620         write_sum_head(f_out, &sum);
 621
 622         if (append_mode > 0 && f_copy < 0)
 623                 return;
 624
 625         if (len > 0)
 626                 mapbuf = map_file(fd, len, MAX_MAP_SIZE, sum.blength);
 627         else
 628                 mapbuf = NULL;
 629
 630         for (i = 0; i < sum.count; i++) {
 631                 int32 n1 = (int32)MIN(len, (OFF_T)sum.blength);
 632                 char *map = map_ptr(mapbuf, offset, n1);
 633                 char sum2[SUM_LENGTH];
 634                 uint32 sum1;
 635
 636                 len -= n1;
 637                 offset += n1;
 638
 639                 if (f_copy >= 0) {
 640                         full_write(f_copy, map, n1);
 641                         if (append_mode > 0)
 642                                 continue;
 643                 }
 644
 645                 sum1 = get_checksum1(map, n1);
 646                 get_checksum2(map, n1, sum2);
 647
 648                 if (verbose > 3) {
 649                         rprintf(FINFO,
 650                                 "chunk[%.0f] offset=%.0f len=%ld sum1=%08lx\n",
 651                                 (double)i, (double)offset - n1, (long)n1,
 652                                 (unsigned long)sum1);
 653                 }
 654                 write_int(f_out, sum1);
 655                 write_buf(f_out, sum2, sum.s2length);
 656         }
 657
 658         if (mapbuf)
 659                 unmap_file(mapbuf);
 660 }
 661
 662
 663 /* Try to find a filename in the same dir as "fname" with a similar name. */
 664 static int find_fuzzy(struct file_struct *file, struct file_list *dirlist)
 665 {
 666         int fname_len, fname_suf_len;
 667         const char *fname_suf, *fname = F_BASENAME(file);
 668         uint32 lowest_dist = 25 << 16; /* ignore a distance greater than 25 */
 669         int j, lowest_j = -1;
 670
 671         fname_len = strlen(fname);
 672         fname_suf = find_filename_suffix(fname, fname_len, &fname_suf_len);
 673
 674         for (j = 0; j < dirlist->count; j++) {
 675                 struct file_struct *fp = dirlist->files[j];
 676                 const char *suf, *name;
 677                 int len, suf_len;
 678                 uint32 dist;
 679
 680                 if (!S_ISREG(fp->mode) || !F_LENGTH(fp) || fp->flags & FLAG_SENT)
 681                         continue;
 682
 683                 name = F_BASENAME(fp);
 684
 685                 if (F_LENGTH(fp) == F_LENGTH(file)
 686                     && cmp_time(fp->modtime, file->modtime) == 0) {
 687                         if (verbose > 4) {
 688                                 rprintf(FINFO,
 689                                         "fuzzy size/modtime match for %s\n",
 690                                         name);
 691                         }
 692                         return j;
 693                 }
 694
 695                 len = strlen(name);
 696                 suf = find_filename_suffix(name, len, &suf_len);
 697
 698                 dist = fuzzy_distance(name, len, fname, fname_len);
 699                 /* Add some extra weight to how well the suffixes match. */
 700                 dist += fuzzy_distance(suf, suf_len, fname_suf, fname_suf_len)
 701                       * 10;
 702                 if (verbose > 4) {
 703                         rprintf(FINFO, "fuzzy distance for %s = %d.%05d\n",
 704                                 name, (int)(dist>>16), (int)(dist&0xFFFF));
 705                 }
 706                 if (dist <= lowest_dist) {
 707                         lowest_dist = dist;
 708                         lowest_j = j;
 709                 }
 710         }
 711
 712         return lowest_j;
 713 }
 714
 715 void check_for_finished_hlinks(int itemizing, enum logcode code)
 716 {
 717         struct file_struct *file;
 718         int ndx;
 719
 720         while ((ndx = get_hlink_num()) != -1) {
 721                 if (ndx < 0 || ndx >= the_file_list->count)
 722                         continue;
 723
 724                 file = the_file_list->files[ndx];
 725                 if (!F_IS_HLINKED(file))
 726                         continue;
 727
 728                 hard_link_cluster(file, ndx, itemizing, code, -1);
 729         }
 730 }
 731
 732 /* This is only called for regular files.  We return -2 if we've finished
 733  * handling the file, -1 if no dest-linking occurred, or a non-negative
 734  * value if we found an alternate basis file. */
 735 static int try_dests_reg(struct file_struct *file, char *fname, int ndx,
 736                          char *cmpbuf, STRUCT_STAT *stp, int itemizing,
 737                          int maybe_ATTRS_REPORT, enum logcode code)
 738 {
 739         int best_match = -1;
 740         int match_level = 0;
 741         int j = 0;
 742
 743         do {
 744                 pathjoin(cmpbuf, MAXPATHLEN, basis_dir[j], fname);
 745                 if (link_stat(cmpbuf, stp, 0) < 0 || !S_ISREG(stp->st_mode))
 746                         continue;
 747                 switch (match_level) {
 748                 case 0:
 749                         best_match = j;
 750                         match_level = 1;
 751                         /* FALL THROUGH */
 752                 case 1:
 753                         if (!unchanged_file(cmpbuf, file, stp))
 754                                 continue;
 755                         best_match = j;
 756                         match_level = 2;
 757                         /* FALL THROUGH */
 758                 case 2:
 759                         if (!unchanged_attrs(file, stp))
 760                                 continue;
 761                         if (always_checksum && preserve_times
 762                          && cmp_time(stp->st_mtime, file->modtime))
 763                                 continue;
 764                         best_match = j;
 765                         match_level = 3;
 766                         break;
 767                 }
 768                 break;
 769         } while (basis_dir[++j] != NULL);
 770
 771         if (!match_level)
 772                 return -1;
 773
 774         if (j != best_match) {
 775                 j = best_match;
 776                 pathjoin(cmpbuf, MAXPATHLEN, basis_dir[j], fname);
 777                 if (link_stat(cmpbuf, stp, 0) < 0)
 778                         return -1;
 779         }
 780
 781         if (match_level == 3 && !copy_dest) {
 782 #ifdef SUPPORT_HARD_LINKS
 783                 if (link_dest) {
 784                         int i = itemizing && (verbose > 1 || stdout_format_has_i > 1);
 785                         if (hard_link_one(file, ndx, fname, 0, stp,
 786                                           cmpbuf, 1, i, code) < 0)
 787                                 goto try_a_copy;
 788                         if (preserve_hard_links && F_IS_HLINKED(file))
 789                                 hard_link_cluster(file, ndx, itemizing, code, j);
 790                 } else
 791 #endif
 792                 if (itemizing)
 793                         itemize(file, ndx, 0, stp, 0, 0, NULL);
 794                 if (verbose > 1 && maybe_ATTRS_REPORT) {
 795                         rprintf(FCLIENT, "%s is uptodate\n", fname);
 796                 }
 797                 return -2;
 798         }
 799
 800         if (match_level >= 2) {
 801           try_a_copy: /* Copy the file locally. */
 802                 if (copy_file(cmpbuf, fname, file->mode) < 0) {
 803                         if (verbose) {
 804                                 rsyserr(FINFO, errno, "copy_file %s => %s",
 805                                         full_fname(cmpbuf), fname);
 806                         }
 807                         return -1;
 808                 }
 809                 if (itemizing)
 810                         itemize(file, ndx, 0, stp, ITEM_LOCAL_CHANGE, 0, NULL);
 811                 set_file_attrs(fname, file, NULL, 0);
 812                 if (maybe_ATTRS_REPORT
 813                  && ((!itemizing && verbose && match_level == 2)
 814                   || (verbose > 1 && match_level == 3))) {
 815                         code = match_level == 3 ? FCLIENT : FINFO;
 816                         rprintf(code, "%s%s\n", fname,
 817                                 match_level == 3 ? " is uptodate" : "");
 818                 }
 819                 if (preserve_hard_links && F_IS_HLINKED(file))
 820                         hard_link_cluster(file, ndx, itemizing, code, j);
 821                 return -2;
 822         }
 823
 824         return FNAMECMP_BASIS_DIR_LOW + j;
 825 }
 826
 827 /* This is only called for non-regular files.  We return -2 if we've finished
 828  * handling the file, or -1 if no dest-linking occurred, or a non-negative
 829  * value if we found an alternate basis file. */
 830 static int try_dests_non(struct file_struct *file, char *fname, int ndx,
 831                          char *cmpbuf, STRUCT_STAT *stp, int itemizing,
 832                          int maybe_ATTRS_REPORT, enum logcode code)
 833 {
 834         char lnk[MAXPATHLEN];
 835         int best_match = -1;
 836         int match_level = 0;
 837         enum nonregtype type;
 838         int len, j = 0;
 839
 840 #ifndef SUPPORT_LINKS
 841         if (S_ISLNK(file->mode))
 842                 return -1;
 843 #endif
 844         if (S_ISDIR(file->mode)) {
 845                 type = TYPE_DIR;
 846         } else if (IS_SPECIAL(file->mode))
 847                 type = TYPE_SPECIAL;
 848         else if (IS_DEVICE(file->mode))
 849                 type = TYPE_DEVICE;
 850 #ifdef SUPPORT_LINKS
 851         else if (S_ISLNK(file->mode))
 852                 type = TYPE_SYMLINK;
 853 #endif
 854         else {
 855                 rprintf(FERROR,
 856                         "internal: try_dests_non() called with invalid mode (%o)\n",
 857                         (int)file->mode);
 858                 exit_cleanup(RERR_UNSUPPORTED);
 859         }
 860
 861         do {
 862                 pathjoin(cmpbuf, MAXPATHLEN, basis_dir[j], fname);
 863                 if (link_stat(cmpbuf, stp, 0) < 0)
 864                         continue;
 865                 switch (type) {
 866                 case TYPE_DIR:
 867                         if (!S_ISDIR(stp->st_mode))
 868                                 continue;
 869                         break;
 870                 case TYPE_SPECIAL:
 871                         if (!IS_SPECIAL(stp->st_mode))
 872                                 continue;
 873                         break;
 874                 case TYPE_DEVICE:
 875                         if (!IS_DEVICE(stp->st_mode))
 876                                 continue;
 877                         break;
 878 #ifdef SUPPORT_LINKS
 879                 case TYPE_SYMLINK:
 880                         if (!S_ISLNK(stp->st_mode))
 881                                 continue;
 882                         break;
 883 #endif
 884                 }
 885                 if (match_level < 1) {
 886                         match_level = 1;
 887                         best_match = j;
 888                 }
 889                 switch (type) {
 890                 case TYPE_DIR:
 891                         break;
 892                 case TYPE_SPECIAL:
 893                 case TYPE_DEVICE:
 894                         if (stp->st_rdev != MAKEDEV(F_DMAJOR(file), F_DMINOR(file)))
 895                                 continue;
 896                         break;
 897 #ifdef SUPPORT_LINKS
 898                 case TYPE_SYMLINK:
 899                         if ((len = readlink(cmpbuf, lnk, MAXPATHLEN-1)) <= 0)
 900                                 continue;
 901                         lnk[len] = '\0';
 902                         if (strcmp(lnk, F_SYMLINK(file)) != 0)
 903                                 continue;
 904                         break;
 905 #endif
 906                 }
 907                 if (match_level < 2) {
 908                         match_level = 2;
 909                         best_match = j;
 910                 }
 911                 if (unchanged_attrs(file, stp)) {
 912                         match_level = 3;
 913                         best_match = j;
 914                         break;
 915                 }
 916         } while (basis_dir[++j] != NULL);
 917
 918         if (!match_level)
 919                 return -1;
 920
 921         if (j != best_match) {
 922                 j = best_match;
 923                 pathjoin(cmpbuf, MAXPATHLEN, basis_dir[j], fname);
 924                 if (link_stat(cmpbuf, stp, 0) < 0)
 925                         return -1;
 926         }
 927
 928         if (match_level == 3) {
 929 #ifdef SUPPORT_HARD_LINKS
 930                 if (link_dest
 931 #ifndef CAN_HARDLINK_SYMLINK
 932                  && !S_ISLNK(file->mode)
 933 #endif
 934 #ifndef CAN_HARDLINK_SPECIAL
 935                  && !IS_SPECIAL(file->mode) && !IS_DEVICE(file->mode)
 936 #endif
 937                  && !S_ISDIR(file->mode)) {
 938                         if (do_link(cmpbuf, fname) < 0) {
 939                                 rsyserr(FERROR, errno,
 940                                         "failed to hard-link %s with %s",
 941                                         cmpbuf, fname);
 942                                 return j;
 943                         }
 944                         if (preserve_hard_links && F_IS_HLINKED(file))
 945                                 hard_link_cluster(file, ndx, itemizing, code, -1);
 946                 } else
 947 #endif
 948                         match_level = 2;
 949                 if (itemizing && stdout_format_has_i
 950                  && (verbose > 1 || stdout_format_has_i > 1)) {
 951                         int chg = compare_dest && type != TYPE_DIR ? 0
 952                             : ITEM_LOCAL_CHANGE
 953                              + (match_level == 3 ? ITEM_XNAME_FOLLOWS : 0);
 954                         char *lp = match_level == 3 ? "" : NULL;
 955                         itemize(file, ndx, 0, stp, chg + ITEM_MATCHED, 0, lp);
 956                 }
 957                 if (verbose > 1 && maybe_ATTRS_REPORT) {
 958                         rprintf(FCLIENT, "%s%s is uptodate\n",
 959                                 fname, type == TYPE_DIR ? "/" : "");
 960                 }
 961                 return -2;
 962         }
 963
 964         return j;
 965 }
 966
 967 static int phase = 0;
 968
 969 /* Acts on the_file_list->file's ndx'th item, whose name is fname.  If a dir,
 970  * make sure it exists, and has the right permissions/timestamp info.  For
 971  * all other non-regular files (symlinks, etc.) we create them here.  For
 972  * regular files that have changed, we try to find a basis file and then
 973  * start sending checksums.
 974  *
 975  * When fname is non-null, it must point to a MAXPATHLEN buffer!
 976  *
 977  * Note that f_out is set to -1 when doing final directory-permission and
 978  * modification-time repair. */
 979 static void recv_generator(char *fname, struct file_struct *file, int ndx,
 980                            int itemizing, int maybe_ATTRS_REPORT,
 981                            enum logcode code, int f_out)
 982 {
 983         static int missing_below = -1, excluded_below = -1;
 984         static const char *parent_dirname = "";
 985         static struct file_list *fuzzy_dirlist = NULL;
 986         static int need_fuzzy_dirlist = 0;
 987         struct file_struct *fuzzy_file = NULL;
 988         int fd = -1, f_copy = -1;
 989         STRUCT_STAT st, real_st, partial_st;
 990         struct file_struct *back_file = NULL;
 991         int statret, real_ret, stat_errno;
 992         char *fnamecmp, *partialptr, *backupptr = NULL;
 993         char fnamecmpbuf[MAXPATHLEN];
 994         uchar fnamecmp_type;
 995         int del_opts = delete_mode || force_delete ? DEL_RECURSE : 0;
 996
 997         if (list_only)
 998                 return;
 999
1000         if (!fname) {
1001                 if (fuzzy_dirlist) {
1002                         flist_free(fuzzy_dirlist);
1003                         fuzzy_dirlist = NULL;
1004                 }
1005                 if (missing_below >= 0) {
1006                         if (dry_run)
1007                                 dry_run--;
1008                         missing_below = -1;
1009                 }
1010                 parent_dirname = "";
1011                 return;
1012         }
1013
1014         if (verbose > 2)
1015                 rprintf(FINFO, "recv_generator(%s,%d)\n", fname, ndx);
1016
1017         if (server_filter_list.head) {
1018                 if (excluded_below >= 0) {
1019                         if (file->dir.depth > excluded_below)
1020                                 goto skipping;
1021                         excluded_below = -1;
1022                 }
1023                 if (check_filter(&server_filter_list, fname,
1024                                  S_ISDIR(file->mode)) < 0) {
1025                         if (S_ISDIR(file->mode))
1026                                 excluded_below = file->dir.depth;
1027                   skipping:
1028                         if (verbose) {
1029                                 rprintf(FINFO,
1030                                         "skipping server-excluded file \"%s\"\n",
1031                                         fname);
1032                         }
1033                         return;
1034                 }
1035         }
1036
1037         if (missing_below >= 0) {
1038                 if (file->dir.depth <= missing_below) {
1039                         if (dry_run)
1040                                 dry_run--;
1041                         missing_below = -1;
1042                 } else if (!dry_run)
1043                         return;
1044         }
1045         if (dry_run > 1) {
1046                 statret = -1;
1047                 stat_errno = ENOENT;
1048         } else {
1049                 const char *dn = file->dirname ? file->dirname : ".";
1050                 if (parent_dirname != dn && strcmp(parent_dirname, dn) != 0) {
1051                         if (relative_paths && !implied_dirs
1052                          && do_stat(dn, &st) < 0
1053                          && create_directory_path(fname) < 0) {
1054                                 rsyserr(FERROR, errno,
1055                                         "recv_generator: mkdir %s failed",
1056                                         full_fname(dn));
1057                         }
1058                         if (fuzzy_dirlist) {
1059                                 flist_free(fuzzy_dirlist);
1060                                 fuzzy_dirlist = NULL;
1061                         }
1062                         if (fuzzy_basis)
1063                                 need_fuzzy_dirlist = 1;
1064                 }
1065                 parent_dirname = dn;
1066
1067                 if (need_fuzzy_dirlist && S_ISREG(file->mode)) {
1068                         strlcpy(fnamecmpbuf, dn, sizeof fnamecmpbuf);
1069                         fuzzy_dirlist = get_dirlist(fnamecmpbuf, -1, 1);
1070                         need_fuzzy_dirlist = 0;
1071                 }
1072
1073                 statret = link_stat(fname, &st,
1074                                     keep_dirlinks && S_ISDIR(file->mode));
1075                 stat_errno = errno;
1076         }
1077
1078         if (ignore_non_existing && statret == -1 && stat_errno == ENOENT) {
1079                 if (verbose > 1) {
1080                         rprintf(FINFO, "not creating new %s \"%s\"\n",
1081                                 S_ISDIR(file->mode) ? "directory" : "file",
1082                                 fname);
1083                 }
1084                 return;
1085         }
1086
1087         /* If we're not preserving permissions, change the file-list's
1088          * mode based on the local permissions and some heuristics. */
1089         if (!preserve_perms) {
1090                 int exists = statret == 0
1091                           && S_ISDIR(st.st_mode) == S_ISDIR(file->mode);
1092                 file->mode = dest_mode(file->mode, st.st_mode, exists);
1093         }
1094
1095         if (S_ISDIR(file->mode)) {
1096                 /* The file to be received is a directory, so we need
1097                  * to prepare appropriately.  If there is already a
1098                  * file of that name and it is *not* a directory, then
1099                  * we need to delete it.  If it doesn't exist, then
1100                  * (perhaps recursively) create it. */
1101                 if (statret == 0 && !S_ISDIR(st.st_mode)) {
1102                         if (delete_item(fname, st.st_mode, "directory", del_opts) != 0)
1103                                 return;
1104                         statret = -1;
1105                 }
1106                 if (dry_run && statret != 0 && missing_below < 0) {
1107                         missing_below = file->dir.depth;
1108                         dry_run++;
1109                 }
1110                 real_ret = statret;
1111                 real_st = st;
1112                 if (new_root_dir) {
1113                         if (*fname == '.' && fname[1] == '\0')
1114                                 statret = -1;
1115                         new_root_dir = 0;
1116                 }
1117                 if (statret != 0 && basis_dir[0] != NULL) {
1118                         int j = try_dests_non(file, fname, ndx, fnamecmpbuf, &st,
1119                                               itemizing, maybe_ATTRS_REPORT, code);
1120                         if (j == -2) {
1121                                 itemizing = 0;
1122                                 code = FNONE;
1123                         } else if (j >= 0)
1124                                 statret = 1;
1125                 }
1126                 if (itemizing && f_out != -1) {
1127                         itemize(file, ndx, statret, &st,
1128                                 statret ? ITEM_LOCAL_CHANGE : 0, 0, NULL);
1129                 }
1130                 if (real_ret != 0 && do_mkdir(fname,file->mode) < 0 && errno != EEXIST) {
1131                         if (!relative_paths || errno != ENOENT
1132                             || create_directory_path(fname) < 0
1133                             || (do_mkdir(fname, file->mode) < 0 && errno != EEXIST)) {
1134                                 rsyserr(FERROR, errno,
1135                                         "recv_generator: mkdir %s failed",
1136                                         full_fname(fname));
1137                                 file->flags |= FLAG_MISSING_DIR;
1138                                 if (ndx+1 < the_file_list->count
1139                                  && the_file_list->files[ndx+1]->dir.depth > file->dir.depth) {
1140                                         rprintf(FERROR,
1141                                             "*** Skipping everything below this failed directory ***\n");
1142                                         missing_below = file->dir.depth;
1143                                 }
1144                                 return;
1145                         }
1146                 }
1147                 if (set_file_attrs(fname, file, real_ret ? NULL : &real_st, 0)
1148                     && verbose && code != FNONE && f_out != -1)
1149                         rprintf(code, "%s/\n", fname);
1150                 if (real_ret != 0 && one_file_system)
1151                         real_st.st_dev = filesystem_dev;
1152                 if (delete_during && f_out != -1 && !phase && dry_run < 2
1153                     && (file->flags & FLAG_XFER_DIR))
1154                         delete_in_dir(the_file_list, fname, file, &real_st);
1155                 return;
1156         }
1157
1158         if (preserve_hard_links && F_IS_HLINKED(file)
1159             && hard_link_check(file, ndx, fname, statret, &st,
1160                                itemizing, code, HL_CHECK_MASTER))
1161                 return;
1162
1163         if (preserve_links && S_ISLNK(file->mode)) {
1164 #ifdef SUPPORT_LINKS
1165                 const char *sl = F_SYMLINK(file);
1166                 if (safe_symlinks && unsafe_symlink(sl, fname)) {
1167                         if (verbose) {
1168                                 if (the_file_list->count == 1)
1169                                         fname = f_name(file, NULL);
1170                                 rprintf(FINFO,
1171                                         "ignoring unsafe symlink %s -> \"%s\"\n",
1172                                         full_fname(fname), sl);
1173                         }
1174                         return;
1175                 }
1176                 if (statret == 0) {
1177                         char lnk[MAXPATHLEN];
1178                         int len;
1179
1180                         if (!S_ISLNK(st.st_mode))
1181                                 statret = -1;
1182                         else if ((len = readlink(fname, lnk, MAXPATHLEN-1)) > 0
1183                               && strncmp(lnk, sl, len) == 0 && sl[len] == '\0') {
1184                                 /* The link is pointing to the right place. */
1185                                 if (itemizing)
1186                                         itemize(file, ndx, 0, &st, 0, 0, NULL);
1187                                 set_file_attrs(fname, file, &st, maybe_ATTRS_REPORT);
1188                                 if (preserve_hard_links && F_IS_HLINKED(file))
1189                                         hard_link_cluster(file, ndx, itemizing, code, -1);
1190                                 if (remove_source_files == 1)
1191                                         goto return_with_success;
1192                                 return;
1193                         }
1194                         /* Not the right symlink (or not a symlink), so
1195                          * delete it. */
1196                         if (delete_item(fname, st.st_mode, "symlink", del_opts) != 0)
1197                                 return;
1198                 } else if (basis_dir[0] != NULL) {
1199                         int j = try_dests_non(file, fname, ndx, fnamecmpbuf, &st,
1200                                               itemizing, maybe_ATTRS_REPORT, code);
1201                         if (j == -2) {
1202 #ifndef CAN_HARDLINK_SYMLINK
1203                                 if (link_dest) {
1204                                         /* Resort to --copy-dest behavior. */
1205                                 } else
1206 #endif
1207                                 if (!copy_dest)
1208                                         return;
1209                                 itemizing = 0;
1210                                 code = FNONE;
1211                         } else if (j >= 0)
1212                                 statret = 1;
1213                 }
1214                 if (preserve_hard_links && F_IS_HLINKED(file)
1215                     && hard_link_check(file, ndx, fname, -1, &st,
1216                                        itemizing, code, HL_SKIP))
1217                         return;
1218                 if (do_symlink(sl, fname) != 0) {
1219                         rsyserr(FERROR, errno, "symlink %s -> \"%s\" failed",
1220                                 full_fname(fname), sl);
1221                 } else {
1222                         set_file_attrs(fname, file, NULL, 0);
1223                         if (itemizing) {
1224                                 itemize(file, ndx, statret, &st,
1225                                         ITEM_LOCAL_CHANGE, 0, NULL);
1226                         }
1227                         if (code != FNONE && verbose)
1228                                 rprintf(code, "%s -> %s\n", fname, sl);
1229                         if (preserve_hard_links && F_IS_HLINKED(file))
1230                                 hard_link_cluster(file, ndx, itemizing, code, -1);
1231                         /* This does not check remove_source_files == 1
1232                          * because this is one of the items that the old
1233                          * --remove-sent-files option would remove. */
1234                         if (remove_source_files)
1235                                 goto return_with_success;
1236                 }
1237 #endif
1238                 return;
1239         }
1240
1241         if ((am_root && preserve_devices && IS_DEVICE(file->mode))
1242          || (preserve_specials && IS_SPECIAL(file->mode))) {
1243                 dev_t rdev = MAKEDEV(F_DMAJOR(file), F_DMINOR(file));
1244                 if (statret == 0) {
1245                         char *t;
1246                         if (IS_DEVICE(file->mode)) {
1247                                 if (!IS_DEVICE(st.st_mode))
1248                                         statret = -1;
1249                                 t = "device file";
1250                         } else {
1251                                 if (!IS_SPECIAL(st.st_mode))
1252                                         statret = -1;
1253                                 t = "special file";
1254                         }
1255                         if (statret == 0
1256                          && (st.st_mode & ~CHMOD_BITS) == (file->mode & ~CHMOD_BITS)
1257                          && st.st_rdev == rdev) {
1258                                 /* The device or special file is identical. */
1259                                 if (itemizing)
1260                                         itemize(file, ndx, 0, &st, 0, 0, NULL);
1261                                 set_file_attrs(fname, file, &st, maybe_ATTRS_REPORT);
1262                                 if (preserve_hard_links && F_IS_HLINKED(file))
1263                                         hard_link_cluster(file, ndx, itemizing, code, -1);
1264                                 if (remove_source_files == 1)
1265                                         goto return_with_success;
1266                                 return;
1267                         }
1268                         if (delete_item(fname, st.st_mode, t, del_opts) != 0)
1269                                 return;
1270                 } else if (basis_dir[0] != NULL) {
1271                         int j = try_dests_non(file, fname, ndx, fnamecmpbuf, &st,
1272                                               itemizing, maybe_ATTRS_REPORT, code);
1273                         if (j == -2) {
1274 #ifndef CAN_HARDLINK_SPECIAL
1275                                 if (link_dest) {
1276                                         /* Resort to --copy-dest behavior. */
1277                                 } else
1278 #endif
1279                                 if (!copy_dest)
1280                                         return;
1281                                 itemizing = 0;
1282                                 code = FNONE;
1283                         } else if (j >= 0)
1284                                 statret = 1;
1285                 }
1286                 if (preserve_hard_links && F_IS_HLINKED(file)
1287                     && hard_link_check(file, ndx, fname, -1, &st,
1288                                        itemizing, code, HL_SKIP))
1289                         return;
1290                 if (verbose > 2) {
1291                         rprintf(FINFO,"mknod(%s,0%o,0x%x)\n",
1292                                 fname, (int)file->mode, (int)rdev);
1293                 }
1294                 if (do_mknod(fname, file->mode, rdev) < 0) {
1295                         rsyserr(FERROR, errno, "mknod %s failed",
1296                                 full_fname(fname));
1297                 } else {
1298                         set_file_attrs(fname, file, NULL, 0);
1299                         if (itemizing) {
1300                                 itemize(file, ndx, statret, &st,
1301                                         ITEM_LOCAL_CHANGE, 0, NULL);
1302                         }
1303                         if (code != FNONE && verbose)
1304                                 rprintf(code, "%s\n", fname);
1305                         if (preserve_hard_links && F_IS_HLINKED(file))
1306                                 hard_link_cluster(file, ndx, itemizing, code, -1);
1307                         if (remove_source_files == 1)
1308                                 goto return_with_success;
1309                 }
1310                 return;
1311         }
1312
1313         if (!S_ISREG(file->mode)) {
1314                 if (the_file_list->count == 1)
1315                         fname = f_name(file, NULL);
1316                 rprintf(FINFO, "skipping non-regular file \"%s\"\n", fname);
1317                 return;
1318         }
1319
1320         if (max_size && F_LENGTH(file) > max_size) {
1321                 if (verbose > 1) {
1322                         if (the_file_list->count == 1)
1323                                 fname = f_name(file, NULL);
1324                         rprintf(FINFO, "%s is over max-size\n", fname);
1325                 }
1326                 return;
1327         }
1328         if (min_size && F_LENGTH(file) < min_size) {
1329                 if (verbose > 1) {
1330                         if (the_file_list->count == 1)
1331                                 fname = f_name(file, NULL);
1332                         rprintf(FINFO, "%s is under min-size\n", fname);
1333                 }
1334                 return;
1335         }
1336
1337         if (ignore_existing && statret == 0) {
1338                 if (verbose > 1)
1339                         rprintf(FINFO, "%s exists\n", fname);
1340                 return;
1341         }
1342
1343         if (update_only && statret == 0
1344             && cmp_time(st.st_mtime, file->modtime) > 0) {
1345                 if (verbose > 1)
1346                         rprintf(FINFO, "%s is newer\n", fname);
1347                 return;
1348         }
1349
1350         fnamecmp = fname;
1351         fnamecmp_type = FNAMECMP_FNAME;
1352
1353         if (statret == 0 && !S_ISREG(st.st_mode)) {
1354                 if (delete_item(fname, st.st_mode, "regular file", del_opts) != 0)
1355                         return;
1356                 statret = -1;
1357                 stat_errno = ENOENT;
1358         }
1359
1360         if (statret != 0 && basis_dir[0] != NULL) {
1361                 int j = try_dests_reg(file, fname, ndx, fnamecmpbuf, &st,
1362                                       itemizing, maybe_ATTRS_REPORT, code);
1363                 if (j == -2) {
1364                         if (remove_source_files == 1)
1365                                 goto return_with_success;
1366                         return;
1367                 }
1368                 if (j >= 0) {
1369                         fnamecmp = fnamecmpbuf;
1370                         fnamecmp_type = j;
1371                         statret = 0;
1372                 }
1373         }
1374
1375         real_ret = statret;
1376         real_st = st;
1377
1378         if (partial_dir && (partialptr = partial_dir_fname(fname)) != NULL
1379             && link_stat(partialptr, &partial_st, 0) == 0
1380             && S_ISREG(partial_st.st_mode)) {
1381                 if (statret != 0)
1382                         goto prepare_to_open;
1383         } else
1384                 partialptr = NULL;
1385
1386         if (statret != 0 && fuzzy_dirlist && dry_run <= 1) {
1387                 int j = find_fuzzy(file, fuzzy_dirlist);
1388                 if (j >= 0) {
1389                         fuzzy_file = fuzzy_dirlist->files[j];
1390                         f_name(fuzzy_file, fnamecmpbuf);
1391                         if (verbose > 2) {
1392                                 rprintf(FINFO, "fuzzy basis selected for %s: %s\n",
1393                                         fname, fnamecmpbuf);
1394                         }
1395                         st.st_size = F_LENGTH(fuzzy_file);
1396                         statret = 0;
1397                         fnamecmp = fnamecmpbuf;
1398                         fnamecmp_type = FNAMECMP_FUZZY;
1399                 }
1400         }
1401
1402         if (statret != 0) {
1403                 if (preserve_hard_links && F_IS_HLINKED(file)
1404                     && hard_link_check(file, ndx, fname, statret, &st,
1405                                        itemizing, code, HL_SKIP))
1406                         return;
1407                 if (stat_errno == ENOENT)
1408                         goto notify_others;
1409                 rsyserr(FERROR, stat_errno, "recv_generator: failed to stat %s",
1410                         full_fname(fname));
1411                 return;
1412         }
1413
1414         if (append_mode && st.st_size > F_LENGTH(file))
1415                 return;
1416
1417         if (fnamecmp_type <= FNAMECMP_BASIS_DIR_HIGH)
1418                 ;
1419         else if (fnamecmp_type == FNAMECMP_FUZZY)
1420                 ;
1421         else if (unchanged_file(fnamecmp, file, &st)) {
1422                 if (partialptr) {
1423                         do_unlink(partialptr);
1424                         handle_partial_dir(partialptr, PDIR_DELETE);
1425                 }
1426                 if (itemizing) {
1427                         itemize(file, ndx, real_ret, &real_st,
1428                                 0, 0, NULL);
1429                 }
1430                 set_file_attrs(fname, file, &st, maybe_ATTRS_REPORT);
1431                 if (preserve_hard_links && F_IS_HLINKED(file))
1432                         hard_link_cluster(file, ndx, itemizing, code, -1);
1433                 if (remove_source_files != 1)
1434                         return;
1435           return_with_success:
1436                 if (!dry_run)
1437                         send_msg_int(MSG_SUCCESS, ndx);
1438                 return;
1439         }
1440
1441   prepare_to_open:
1442         if (partialptr) {
1443                 st = partial_st;
1444                 fnamecmp = partialptr;
1445                 fnamecmp_type = FNAMECMP_PARTIAL_DIR;
1446                 statret = 0;
1447         }
1448
1449         if (!do_xfers || read_batch || whole_file)
1450                 goto notify_others;
1451
1452         if (fuzzy_dirlist) {
1453                 int j = flist_find(fuzzy_dirlist, file);
1454                 if (j >= 0) /* don't use changing file as future fuzzy basis */
1455                         fuzzy_dirlist->files[j]->flags |= FLAG_SENT;
1456         }
1457
1458         /* open the file */
1459         fd = do_open(fnamecmp, O_RDONLY, 0);
1460
1461         if (fd == -1) {
1462                 rsyserr(FERROR, errno, "failed to open %s, continuing",
1463                         full_fname(fnamecmp));
1464           pretend_missing:
1465                 /* pretend the file didn't exist */
1466                 if (preserve_hard_links && F_IS_HLINKED(file)
1467                     && hard_link_check(file, ndx, fname, statret, &st,
1468                                        itemizing, code, HL_SKIP))
1469                         return;
1470                 statret = real_ret = -1;
1471                 goto notify_others;
1472         }
1473
1474         if (inplace && make_backups && fnamecmp_type == FNAMECMP_FNAME) {
1475                 if (!(backupptr = get_backup_name(fname))) {
1476                         close(fd);
1477                         return;
1478                 }
1479                 if (!(back_file = make_file(fname, NULL, NULL, 0, NO_FILTERS))) {
1480                         close(fd);
1481                         goto pretend_missing;
1482                 }
1483                 if (robust_unlink(backupptr) && errno != ENOENT) {
1484                         rsyserr(FERROR, errno, "unlink %s",
1485                                 full_fname(backupptr));
1486                         unmake_file(back_file);
1487                         close(fd);
1488                         return;
1489                 }
1490                 if ((f_copy = do_open(backupptr,
1491                     O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0600)) < 0) {
1492                         rsyserr(FERROR, errno, "open %s",
1493                                 full_fname(backupptr));
1494                         unmake_file(back_file);
1495                         close(fd);
1496                         return;
1497                 }
1498                 fnamecmp_type = FNAMECMP_BACKUP;
1499         }
1500
1501         if (verbose > 3) {
1502                 rprintf(FINFO, "gen mapped %s of size %.0f\n",
1503                         fnamecmp, (double)st.st_size);
1504         }
1505
1506         if (verbose > 2)
1507                 rprintf(FINFO, "generating and sending sums for %d\n", ndx);
1508
1509   notify_others:
1510         if (remove_source_files && !delay_updates && !phase)
1511                 increment_active_files(ndx, itemizing, code);
1512         write_int(f_out, ndx);
1513         if (itemizing) {
1514                 int iflags = ITEM_TRANSFER;
1515                 if (always_checksum)
1516                         iflags |= ITEM_REPORT_CHECKSUM;
1517                 if (fnamecmp_type != FNAMECMP_FNAME)
1518                         iflags |= ITEM_BASIS_TYPE_FOLLOWS;
1519                 if (fnamecmp_type == FNAMECMP_FUZZY)
1520                         iflags |= ITEM_XNAME_FOLLOWS;
1521                 itemize(file, -1, real_ret, &real_st, iflags, fnamecmp_type,
1522                         fuzzy_file ? F_BASENAME(fuzzy_file) : NULL);
1523         }
1524
1525         if (!do_xfers) {
1526                 if (preserve_hard_links && F_IS_HLINKED(file))
1527                         hard_link_cluster(file, ndx, itemizing, code, -1);
1528                 return;
1529         }
1530         if (read_batch)
1531                 return;
1532
1533         if (statret != 0 || whole_file) {
1534                 write_sum_head(f_out, NULL);
1535                 return;
1536         }
1537
1538         generate_and_send_sums(fd, st.st_size, f_out, f_copy);
1539
1540         if (f_copy >= 0) {
1541                 close(f_copy);
1542                 set_file_attrs(backupptr, back_file, NULL, 0);
1543                 if (verbose > 1) {
1544                         rprintf(FINFO, "backed up %s to %s\n",
1545                                 fname, backupptr);
1546                 }
1547                 unmake_file(back_file);
1548         }
1549
1550         close(fd);
1551 }
1552
1553 void generate_files(int f_out, struct file_list *flist, char *local_name)
1554 {
1555         int i;
1556         char fbuf[MAXPATHLEN];
1557         int itemizing, maybe_ATTRS_REPORT;
1558         enum logcode code;
1559         int lull_mod = allowed_lull * 5;
1560         int need_retouch_dir_times = preserve_times && !omit_dir_times;
1561         int need_retouch_dir_perms = 0;
1562         int save_ignore_existing = ignore_existing;
1563         int save_ignore_non_existing = ignore_non_existing;
1564         int save_do_progress = do_progress;
1565         int save_make_backups = make_backups;
1566         int dir_tweaking = !(list_only || local_name || dry_run);
1567
1568         if (protocol_version >= 29) {
1569                 itemizing = 1;
1570                 maybe_ATTRS_REPORT = stdout_format_has_i ? 0 : ATTRS_REPORT;
1571                 code = logfile_format_has_i ? FNONE : FLOG;
1572         } else if (am_daemon) {
1573                 itemizing = logfile_format_has_i && do_xfers;
1574                 maybe_ATTRS_REPORT = ATTRS_REPORT;
1575                 code = itemizing || !do_xfers ? FCLIENT : FINFO;
1576         } else if (!am_server) {
1577                 itemizing = stdout_format_has_i;
1578                 maybe_ATTRS_REPORT = stdout_format_has_i ? 0 : ATTRS_REPORT;
1579                 code = itemizing ? FNONE : FINFO;
1580         } else {
1581                 itemizing = 0;
1582                 maybe_ATTRS_REPORT = ATTRS_REPORT;
1583                 code = FINFO;
1584         }
1585
1586         if (verbose > 2) {
1587                 rprintf(FINFO, "generator starting pid=%ld count=%d\n",
1588                         (long)getpid(), flist->count);
1589         }
1590
1591         if (delete_before && !local_name && flist->count > 0)
1592                 do_delete_pass(flist);
1593         if (delete_during == 2)
1594                 start_delete_temp();
1595         do_progress = 0;
1596
1597         if (append_mode || whole_file < 0)
1598                 whole_file = 0;
1599         if (verbose >= 2) {
1600                 rprintf(FINFO, "delta-transmission %s\n",
1601                         whole_file
1602                         ? "disabled for local transfer or --whole-file"
1603                         : "enabled");
1604         }
1605
1606         /* Since we often fill up the outgoing socket and then just sit around
1607          * waiting for the other 2 processes to do their thing, we don't want
1608          * to exit on a timeout.  If the data stops flowing, the receiver will
1609          * notice that and let us know via the redo pipe (or its closing). */
1610         ignore_timeout = 1;
1611
1612         for (i = 0; i < flist->count; i++) {
1613                 struct file_struct *file = flist->files[i];
1614
1615                 if (!F_IS_ACTIVE(file))
1616                         continue;
1617
1618                 if (local_name)
1619                         strlcpy(fbuf, local_name, sizeof fbuf);
1620                 else
1621                         f_name(file, fbuf);
1622                 recv_generator(fbuf, file, i, itemizing, maybe_ATTRS_REPORT,
1623                                code, f_out);
1624
1625                 /* We need to ensure that any dirs we create have writeable
1626                  * permissions during the time we are putting files within
1627                  * them.  This is then fixed after the transfer is done. */
1628 #ifdef HAVE_CHMOD
1629                 if (!am_root && S_ISDIR(file->mode) && !(file->mode & S_IWUSR)
1630                  && dir_tweaking) {
1631                         mode_t mode = file->mode | S_IWUSR; /* user write */
1632                         char *fname = local_name ? local_name : fbuf;
1633                         if (do_chmod(fname, mode) < 0) {
1634                                 rsyserr(FERROR, errno,
1635                                         "failed to modify permissions on %s",
1636                                         full_fname(fname));
1637                         }
1638                         need_retouch_dir_perms = 1;
1639                 }
1640 #endif
1641
1642                 if (preserve_hard_links)
1643                         check_for_finished_hlinks(itemizing, code);
1644
1645                 if (allowed_lull && !(i % lull_mod))
1646                         maybe_send_keepalive();
1647                 else if (!(i % 200))
1648                         maybe_flush_socket();
1649         }
1650         recv_generator(NULL, NULL, 0, 0, 0, code, -1);
1651         if (delete_during)
1652                 delete_in_dir(NULL, NULL, NULL, NULL);
1653
1654         phase++;
1655         csum_length = SUM_LENGTH;
1656         max_size = min_size = ignore_existing = ignore_non_existing = 0;
1657         update_only = always_checksum = size_only = 0;
1658         ignore_times = 1;
1659         if (append_mode)  /* resend w/o append mode */
1660                 append_mode = -1; /* ... but only longer files */
1661         make_backups = 0; /* avoid a duplicate backup for inplace processing */
1662
1663         if (verbose > 2)
1664                 rprintf(FINFO,"generate_files phase=%d\n",phase);
1665
1666         write_int(f_out, NDX_DONE);
1667
1668         /* files can cycle through the system more than once
1669          * to catch initial checksum errors */
1670         while ((i = get_redo_num(itemizing, code)) != -1) {
1671                 struct file_struct *file = flist->files[i];
1672                 if (local_name)
1673                         strlcpy(fbuf, local_name, sizeof fbuf);
1674                 else
1675                         f_name(file, fbuf);
1676                 recv_generator(fbuf, file, i, itemizing, maybe_ATTRS_REPORT,
1677                                code, f_out);
1678         }
1679
1680         phase++;
1681         ignore_non_existing = save_ignore_non_existing;
1682         ignore_existing = save_ignore_existing;
1683         make_backups = save_make_backups;
1684
1685         if (verbose > 2)
1686                 rprintf(FINFO,"generate_files phase=%d\n",phase);
1687
1688         write_int(f_out, NDX_DONE);
1689         /* Reduce round-trip lag-time for a useless delay-updates phase. */
1690         if (protocol_version >= 29 && !delay_updates)
1691                 write_int(f_out, NDX_DONE);
1692
1693         /* Read MSG_DONE for the redo phase (and any prior messages). */
1694         get_redo_num(itemizing, code);
1695
1696         if (protocol_version >= 29) {
1697                 phase++;
1698                 if (verbose > 2)
1699                         rprintf(FINFO, "generate_files phase=%d\n", phase);
1700                 if (delay_updates)
1701                         write_int(f_out, NDX_DONE);
1702                 /* Read MSG_DONE for delay-updates phase & prior messages. */
1703                 get_redo_num(itemizing, code);
1704         }
1705
1706         do_progress = save_do_progress;
1707         if (delete_delay_fp)
1708                 delayed_deletions(fbuf);
1709         if (delete_after && !local_name && flist->count > 0)
1710                 do_delete_pass(flist);
1711
1712         if ((need_retouch_dir_perms || need_retouch_dir_times) && dir_tweaking) {
1713                 int j = 0;
1714                 /* Now we need to fix any directory permissions that were
1715                  * modified during the transfer and/or re-set any tweaked
1716                  * modified-time values. */
1717                 for (i = 0; i < flist->count; i++) {
1718                         struct file_struct *file = flist->files[i];
1719                         if (!F_IS_ACTIVE(file) || !S_ISDIR(file->mode))
1720                                 continue;
1721                         if (!need_retouch_dir_times && file->mode & S_IWUSR)
1722                                 continue;
1723                         if (file->flags & FLAG_MISSING_DIR) {
1724                                 int missing = file->dir.depth;
1725                                 while (++i < flist->count) {
1726                                         file = flist->files[i];
1727                                         if (file->dir.depth <= missing)
1728                                                 break;
1729                                 }
1730                                 i--;
1731                                 continue;
1732                         }
1733                         recv_generator(f_name(file, NULL), file, i, itemizing,
1734                                        maybe_ATTRS_REPORT, code, -1);
1735                         if (allowed_lull && !(++j % lull_mod))
1736                                 maybe_send_keepalive();
1737                         else if (!(j % 200))
1738                                 maybe_flush_socket();
1739                 }
1740         }
1741         recv_generator(NULL, NULL, 0, 0, 0, code, -1);
1742
1743         if (max_delete >= 0 && deletion_count > max_delete) {
1744                 rprintf(FINFO,
1745                         "Deletions stopped due to --max-delete limit (%d skipped)\n",
1746                         deletion_count - max_delete);
1747                 io_error |= IOERR_DEL_LIMIT;
1748         }
1749
1750         if (verbose > 2)
1751                 rprintf(FINFO,"generate_files finished\n");
1752 }