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