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