generator.c

   1 /*
   2  * Routines that are exclusive to the generator process.
   3  *
   4  * Copyright (C) 1996-2000 Andrew Tridgell
   5  * Copyright (C) 1996 Paul Mackerras
   6  * Copyright (C) 2002 Martin Pool <mbp@samba.org>
   7  * Copyright (C) 2003, 2004, 2005, 2006 Wayne Davison
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write to the Free Software Foundation, Inc.,
  21  * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
  22  */
  23
  24 #include "rsync.h"
  25
  26 extern int verbose;
  27 extern int dry_run;
  28 extern int do_xfers;
  29 extern int stdout_format_has_i;
  30 extern int logfile_format_has_i;
  31 extern int am_root;
  32 extern int am_server;
  33 extern int am_daemon;
  34 extern int do_progress;
  35 extern int relative_paths;
  36 extern int implied_dirs;
  37 extern int keep_dirlinks;
  38 extern int preserve_links;
  39 extern int preserve_devices;
  40 extern int preserve_specials;
  41 extern int preserve_hard_links;
  42 extern int preserve_perms;
  43 extern int preserve_uid;
  44 extern int preserve_gid;
  45 extern int preserve_times;
  46 extern int omit_dir_times;
  47 extern int delete_mode;
  48 extern int delete_before;
  49 extern int delete_during;
  50 extern int delete_after;
  51 extern int module_id;
  52 extern int ignore_errors;
  53 extern int remove_source_files;
  54 extern int delay_updates;
  55 extern int update_only;
  56 extern int ignore_existing;
  57 extern int ignore_non_existing;
  58 extern int inplace;
  59 extern int append_mode;
  60 extern int make_backups;
  61 extern int csum_length;
  62 extern int ignore_times;
  63 extern int size_only;
  64 extern OFF_T max_size;
  65 extern OFF_T min_size;
  66 extern int io_error;
  67 extern int allowed_lull;
  68 extern int sock_f_out;
  69 extern int ignore_timeout;
  70 extern int protocol_version;
  71 extern int fuzzy_basis;
  72 extern int always_checksum;
  73 extern int checksum_len;
  74 extern char *partial_dir;
  75 extern char *basis_dir[];
  76 extern int compare_dest;
  77 extern int copy_dest;
  78 extern int link_dest;
  79 extern int whole_file;
  80 extern int list_only;
  81 extern int new_root_dir;
  82 extern int read_batch;
  83 extern int safe_symlinks;
  84 extern long block_size; /* "long" because popt can't set an int32. */
  85 extern int max_delete;
  86 extern int force_delete;
  87 extern int one_file_system;
  88 extern struct stats stats;
  89 extern dev_t filesystem_dev;
  90 extern char *backup_dir;
  91 extern char *backup_suffix;
  92 extern int backup_suffix_len;
  93 extern struct file_list *the_file_list;
  94 extern struct filter_list_struct server_filter_list;
  95
  96 int ignore_perishable = 0;
  97 int non_perishable_cnt = 0;
  98
  99 static int deletion_count = 0; /* used to implement --max-delete */
 100 static int deldelay_size = 0, deldelay_cnt = 0;
 101 static char *deldelay_buf = NULL;
 102 static int deldelay_fd = -1;
 103 static BOOL solo_file = 0;
 104
 105 /* For calling delete_item() and delete_dir_contents(). */
 106 #define DEL_RECURSE             (1<<1) /* recurse */
 107 #define DEL_DIR_IS_EMPTY        (1<<2) /* internal delete_FUNCTIONS use only */
 108
 109 enum nonregtype {
 110     TYPE_DIR, TYPE_SPECIAL, TYPE_DEVICE, TYPE_SYMLINK
 111 };
 112
 113 enum delret {
 114     DR_SUCCESS = 0, DR_FAILURE, DR_AT_LIMIT, DR_NOT_EMPTY
 115 };
 116
 117 /* Forward declaration for delete_item(). */
 118 static enum delret delete_dir_contents(char *fname, int flags);
 119
 120
 121 static int is_backup_file(char *fn)
 122 {
 123         int k = strlen(fn) - backup_suffix_len;
 124         return k > 0 && strcmp(fn+k, backup_suffix) == 0;
 125 }
 126
 127 /* Delete a file or directory.  If DEL_RECURSE is set in the flags, this will
 128  * delete recursively.
 129  *
 130  * Note that fbuf must point to a MAXPATHLEN buffer if the mode indicates it's
 131  * a directory! (The buffer is used for recursion, but returned unchanged.)
 132  */
 133 static enum delret delete_item(char *fbuf, int mode, char *replace, int flags)
 134 {
 135         enum delret ret;
 136         char *what;
 137         int ok;
 138
 139         if (verbose > 2) {
 140                 rprintf(FINFO, "delete_item(%s) mode=%o flags=%d\n",
 141                         fbuf, mode, flags);
 142         }
 143
 144         if (S_ISDIR(mode) && !(flags & DEL_DIR_IS_EMPTY)) {
 145                 ignore_perishable = 1;
 146                 /* If DEL_RECURSE is not set, this just reports emptiness. */
 147                 ret = delete_dir_contents(fbuf, flags);
 148                 ignore_perishable = 0;
 149                 if (ret == DR_NOT_EMPTY || ret == DR_AT_LIMIT)
 150                         goto check_ret;
 151                 /* OK: try to delete the directory. */
 152         }
 153
 154         if (!replace && max_delete >= 0 && ++deletion_count > max_delete)
 155                 return DR_AT_LIMIT;
 156
 157         if (S_ISDIR(mode)) {
 158                 what = "rmdir";
 159                 ok = do_rmdir(fbuf) == 0;
 160         } else if (make_backups && (backup_dir || !is_backup_file(fbuf))) {
 161                 what = "make_backup";
 162                 ok = make_backup(fbuf);
 163         } else {
 164                 what = "unlink";
 165                 ok = robust_unlink(fbuf) == 0;
 166         }
 167
 168         if (ok) {
 169                 if (!replace)
 170                         log_delete(fbuf, mode);
 171                 ret = DR_SUCCESS;
 172         } else {
 173                 if (S_ISDIR(mode) && errno == ENOTEMPTY) {
 174                         rprintf(FINFO, "cannot delete non-empty directory: %s\n",
 175                                 fbuf);
 176                         ret = DR_NOT_EMPTY;
 177                 } else if (errno != ENOENT) {
 178                         rsyserr(FERROR, errno, "delete_file: %s(%s) failed",
 179                                 what, fbuf);
 180                         ret = DR_FAILURE;
 181                 } else {
 182                         deletion_count--;
 183                         ret = DR_SUCCESS;
 184                 }
 185         }
 186
 187   check_ret:
 188         if (replace && ret != DR_SUCCESS) {
 189                 rprintf(FERROR, "could not make way for new %s: %s\n",
 190                         replace, fbuf);
 191         }
 192         return ret;
 193 }
 194
 195 /* The directory is about to be deleted: if DEL_RECURSE is given, delete all
 196  * its contents, otherwise just checks for content.  Returns DR_SUCCESS or
 197  * DR_NOT_EMPTY.  Note that fname must point to a MAXPATHLEN buffer!  (The
 198  * buffer is used for recursion, but returned unchanged.)
 199  */
 200 static enum delret delete_dir_contents(char *fname, int flags)
 201 {
 202         struct file_list *dirlist;
 203         enum delret ret;
 204         unsigned remainder;
 205         void *save_filters;
 206         int j, dlen;
 207         char *p;
 208
 209         if (verbose > 3) {
 210                 rprintf(FINFO, "delete_dir_contents(%s) flags=%d\n",
 211                         fname, flags);
 212         }
 213
 214         dlen = strlen(fname);
 215         save_filters = push_local_filters(fname, dlen);
 216
 217         non_perishable_cnt = 0;
 218         dirlist = get_dirlist(fname, dlen, 0);
 219         ret = non_perishable_cnt ? DR_NOT_EMPTY : DR_SUCCESS;
 220
 221         if (!dirlist->count)
 222                 goto done;
 223
 224         if (!(flags & DEL_RECURSE)) {
 225                 ret = DR_NOT_EMPTY;
 226                 goto done;
 227         }
 228
 229         p = fname + dlen;
 230         if (dlen != 1 || *fname != '/')
 231                 *p++ = '/';
 232         remainder = MAXPATHLEN - (p - fname);
 233
 234         /* We do our own recursion, so make delete_item() non-recursive. */
 235         flags = (flags & ~DEL_RECURSE) | DEL_DIR_IS_EMPTY;
 236
 237         for (j = dirlist->count; j--; ) {
 238                 struct file_struct *fp = dirlist->files[j];
 239
 240                 if (fp->flags & FLAG_MOUNT_DIR) {
 241                         if (verbose > 1) {
 242                                 rprintf(FINFO,
 243                                     "mount point, %s, pins parent directory\n",
 244                                     f_name(fp, NULL));
 245                         }
 246                         ret = DR_NOT_EMPTY;
 247                         continue;
 248                 }
 249
 250                 strlcpy(p, F_BASENAME(fp), remainder);
 251                 /* Save stack by recursing to ourself directly. */
 252                 if (S_ISDIR(fp->mode)
 253                  && delete_dir_contents(fname, flags | DEL_RECURSE) != DR_SUCCESS)
 254                         ret = DR_NOT_EMPTY;
 255                 if (delete_item(fname, fp->mode, NULL, flags) != DR_SUCCESS)
 256                         ret = DR_NOT_EMPTY;
 257         }
 258
 259         fname[dlen] = '\0';
 260
 261   done:
 262         flist_free(dirlist);
 263         pop_local_filters(save_filters);
 264
 265         if (ret == DR_NOT_EMPTY) {
 266                 rprintf(FINFO, "cannot delete non-empty directory: %s\n",
 267                         fname);
 268         }
 269         return ret;
 270 }
 271
 272 static int start_delete_delay_temp(void)
 273 {
 274         char fnametmp[MAXPATHLEN];
 275         int save_dry_run = dry_run;
 276
 277         dry_run = 0;
 278         if (!get_tmpname(fnametmp, "deldelay")
 279          || (deldelay_fd = do_mkstemp(fnametmp, 0600)) < 0) {
 280                 rprintf(FINFO, "NOTE: Unable to create delete-delay temp file--"
 281                         "switching to --delete-after.\n");
 282                 delete_during = 0;
 283                 delete_after = 1;
 284                 dry_run = save_dry_run;
 285                 return 0;
 286         }
 287         dry_run = save_dry_run;
 288         unlink(fnametmp);
 289         return 1;
 290 }
 291
 292 static int flush_delete_delay(void)
 293 {
 294         if (write(deldelay_fd, deldelay_buf, deldelay_cnt) != deldelay_cnt) {
 295                 rsyserr(FERROR, errno, "flush of delete-delay buffer");
 296                 delete_during = 0;
 297                 delete_after = 1;
 298                 close(deldelay_fd);
 299                 return 0;
 300         }
 301         deldelay_cnt = 0;
 302         return 1;
 303 }
 304
 305 static int remember_delete(struct file_struct *file, const char *fname)
 306 {
 307         int len;
 308
 309         while (1) {
 310                 len = snprintf(deldelay_buf + deldelay_cnt,
 311                                deldelay_size - deldelay_cnt,
 312                                "%x %s%c", (int)file->mode, fname, '\0');
 313                 if ((deldelay_cnt += len) <= deldelay_size)
 314                         break;
 315                 if (deldelay_fd < 0 && !start_delete_delay_temp())
 316                         return 0;
 317                 deldelay_cnt -= len;
 318                 if (!flush_delete_delay())
 319                         return 0;
 320         }
 321
 322         return 1;
 323 }
 324
 325 static int read_delay_line(char *buf)
 326 {
 327         static int read_pos = 0;
 328         int j, len, mode;
 329         char *bp, *past_space;
 330
 331         while (1) {
 332                 for (j = read_pos; j < deldelay_cnt && deldelay_buf[j]; j++) {}
 333                 if (j < deldelay_cnt)
 334                         break;
 335                 if (deldelay_fd < 0) {
 336                         if (j > read_pos)
 337                                 goto invalid_data;
 338                         return -1;
 339                 }
 340                 deldelay_cnt -= read_pos;
 341                 if (deldelay_cnt == deldelay_size)
 342                         goto invalid_data;
 343                 if (deldelay_cnt && read_pos) {
 344                         memmove(deldelay_buf, deldelay_buf + read_pos,
 345                                 deldelay_cnt);
 346                 }
 347                 len = read(deldelay_fd, deldelay_buf + deldelay_cnt,
 348                            deldelay_size - deldelay_cnt);
 349                 if (len == 0) {
 350                         if (deldelay_cnt) {
 351                                 rprintf(FERROR,
 352                                     "ERROR: unexpected EOF in delete-delay file.\n");
 353                         }
 354                         return -1;
 355                 }
 356                 if (len < 0) {
 357                         rsyserr(FERROR, errno,
 358                                 "reading delete-delay file");
 359                         return -1;
 360                 }
 361                 deldelay_cnt += len;
 362                 read_pos = 0;
 363         }
 364
 365         bp = deldelay_buf + read_pos;
 366
 367         if (sscanf(bp, "%x ", &mode) != 1) {
 368           invalid_data:
 369                 rprintf(FERROR, "ERROR: invalid data in delete-delay file.\n");
 370                 return -1;
 371         }
 372         past_space = strchr(bp, ' ') + 1;
 373         len = j - read_pos - (past_space - bp) + 1; /* count the '\0' */
 374         read_pos = j + 1;
 375
 376         if (len > MAXPATHLEN) {
 377                 rprintf(FERROR, "ERROR: filename too long in delete-delay file.\n");
 378                 return -1;
 379         }
 380
 381         /* The caller needs the name in a MAXPATHLEN buffer, so we copy it
 382          * instead of returning a pointer to our buffer. */
 383         memcpy(buf, past_space, len);
 384
 385         return mode;
 386 }
 387
 388 static void do_delayed_deletions(char *delbuf)
 389 {
 390         int mode;
 391
 392         if (deldelay_fd >= 0) {
 393                 if (deldelay_cnt && !flush_delete_delay())
 394                         return;
 395                 lseek(deldelay_fd, 0, 0);
 396         }
 397         while ((mode = read_delay_line(delbuf)) >= 0)
 398                 delete_item(delbuf, mode, NULL, DEL_RECURSE);
 399         if (deldelay_fd >= 0)
 400                 close(deldelay_fd);
 401 }
 402
 403 /* This function is used to implement per-directory deletion, and is used by
 404  * all the --delete-WHEN options.  Note that the fbuf pointer must point to a
 405  * MAXPATHLEN buffer with the name of the directory in it (the functions we
 406  * call will append names onto the end, but the old dir value will be restored
 407  * on exit). */
 408 static void delete_in_dir(struct file_list *flist, char *fbuf,
 409                           struct file_struct *file, STRUCT_STAT *stp)
 410 {
 411         static int min_depth = MAXPATHLEN, cur_depth = -1;
 412         static void *filt_array[MAXPATHLEN/2+1];
 413         static int already_warned = 0;
 414         struct file_list *dirlist;
 415         char delbuf[MAXPATHLEN];
 416         int dlen, i;
 417
 418         if (!flist) {
 419                 while (cur_depth >= min_depth)
 420                         pop_local_filters(filt_array[cur_depth--]);
 421                 min_depth = MAXPATHLEN;
 422                 cur_depth = -1;
 423                 return;
 424         }
 425
 426         if (verbose > 2)
 427                 rprintf(FINFO, "delete_in_dir(%s)\n", fbuf);
 428
 429         if (allowed_lull)
 430                 maybe_send_keepalive();
 431
 432         if (file->dir.depth >= MAXPATHLEN/2+1)
 433                 return; /* Impossible... */
 434
 435         if (io_error && !(lp_ignore_errors(module_id) || ignore_errors)) {
 436                 if (already_warned)
 437                         return;
 438                 rprintf(FINFO,
 439                         "IO error encountered -- skipping file deletion\n");
 440                 already_warned = 1;
 441                 return;
 442         }
 443
 444         while (cur_depth >= file->dir.depth && cur_depth >= min_depth)
 445                 pop_local_filters(filt_array[cur_depth--]);
 446         cur_depth = file->dir.depth;
 447         if (min_depth > cur_depth)
 448                 min_depth = cur_depth;
 449         dlen = strlen(fbuf);
 450         filt_array[cur_depth] = push_local_filters(fbuf, dlen);
 451
 452         if (one_file_system) {
 453                 if (file->flags & FLAG_TOP_DIR)
 454                         filesystem_dev = stp->st_dev;
 455                 else if (filesystem_dev != stp->st_dev)
 456                         return;
 457         }
 458
 459         dirlist = get_dirlist(fbuf, dlen, 0);
 460
 461         /* If an item in dirlist is not found in flist, delete it
 462          * from the filesystem. */
 463         for (i = dirlist->count; i--; ) {
 464                 struct file_struct *fp = dirlist->files[i];
 465                 if (!F_IS_ACTIVE(fp))
 466                         continue;
 467                 if (fp->flags & FLAG_MOUNT_DIR) {
 468                         if (verbose > 1)
 469                                 rprintf(FINFO, "cannot delete mount point: %s\n",
 470                                         f_name(fp, NULL));
 471                         continue;
 472                 }
 473                 if (flist_find(flist, fp) < 0) {
 474                         f_name(fp, delbuf);
 475                         if (delete_during == 2) {
 476                                 if (!remember_delete(fp, delbuf))
 477                                         break;
 478                         } else
 479                                 delete_item(delbuf, fp->mode, NULL, DEL_RECURSE);
 480                 }
 481         }
 482
 483         flist_free(dirlist);
 484 }
 485
 486 /* This deletes any files on the receiving side that are not present on the
 487  * sending side.  This is used by --delete-before and --delete-after. */
 488 static void do_delete_pass(struct file_list *flist)
 489 {
 490         char fbuf[MAXPATHLEN];
 491         STRUCT_STAT st;
 492         int j;
 493
 494         /* dry_run is incremented when the destination doesn't exist yet. */
 495         if (dry_run > 1 || list_only)
 496                 return;
 497
 498         for (j = 0; j < flist->count; j++) {
 499                 struct file_struct *file = flist->files[j];
 500
 501                 if (!(file->flags & FLAG_XFER_DIR))
 502                         continue;
 503
 504                 f_name(file, fbuf);
 505                 if (verbose > 1 && file->flags & FLAG_TOP_DIR)
 506                         rprintf(FINFO, "deleting in %s\n", fbuf);
 507
 508                 if (link_stat(fbuf, &st, keep_dirlinks) < 0
 509                  || !S_ISDIR(st.st_mode))
 510                         continue;
 511
 512                 delete_in_dir(flist, fbuf, file, &st);
 513         }
 514         delete_in_dir(NULL, NULL, NULL, NULL);
 515
 516         if (do_progress && !am_server)
 517                 rprintf(FINFO, "                    \r");
 518 }
 519
 520 int unchanged_attrs(struct file_struct *file, STRUCT_STAT *st)
 521 {
 522         if (preserve_perms
 523          && (st->st_mode & CHMOD_BITS) != (file->mode & CHMOD_BITS))
 524                 return 0;
 525
 526         if (am_root && preserve_uid && st->st_uid != F_UID(file))
 527                 return 0;
 528
 529         if (preserve_gid && F_GID(file) != GID_NONE && st->st_gid != F_GID(file))
 530                 return 0;
 531
 532         return 1;
 533 }
 534
 535 void itemize(struct file_struct *file, int ndx, int statret, STRUCT_STAT *st,
 536              int32 iflags, uchar fnamecmp_type, const char *xname)
 537 {
 538         if (statret >= 0) { /* A from-dest-dir statret can == 1! */
 539                 int keep_time = !preserve_times ? 0
 540                     : S_ISDIR(file->mode) ? !omit_dir_times
 541                     : !S_ISLNK(file->mode);
 542
 543                 if (S_ISREG(file->mode) && F_LENGTH(file) != st->st_size)
 544                         iflags |= ITEM_REPORT_SIZE;
 545                 if ((iflags & (ITEM_TRANSFER|ITEM_LOCAL_CHANGE) && !keep_time
 546                   && !(iflags & ITEM_MATCHED)
 547                   && (!(iflags & ITEM_XNAME_FOLLOWS) || *xname))
 548                  || (keep_time && cmp_time(file->modtime, st->st_mtime) != 0))
 549                         iflags |= ITEM_REPORT_TIME;
 550                 if ((file->mode & CHMOD_BITS) != (st->st_mode & CHMOD_BITS))
 551                         iflags |= ITEM_REPORT_PERMS;
 552                 if (preserve_uid && am_root && F_UID(file) != st->st_uid)
 553                         iflags |= ITEM_REPORT_OWNER;
 554                 if (preserve_gid && F_GID(file) != GID_NONE
 555                     && st->st_gid != F_GID(file))
 556                         iflags |= ITEM_REPORT_GROUP;
 557         } else
 558                 iflags |= ITEM_IS_NEW;
 559
 560         iflags &= 0xffff;
 561         if ((iflags & SIGNIFICANT_ITEM_FLAGS || verbose > 1
 562           || stdout_format_has_i > 1 || (xname && *xname)) && !read_batch) {
 563                 if (protocol_version >= 29) {
 564                         if (ndx >= 0)
 565                                 write_int(sock_f_out, ndx);
 566                         write_shortint(sock_f_out, iflags);
 567                         if (iflags & ITEM_BASIS_TYPE_FOLLOWS)
 568                                 write_byte(sock_f_out, fnamecmp_type);
 569                         if (iflags & ITEM_XNAME_FOLLOWS)
 570                                 write_vstring(sock_f_out, xname, strlen(xname));
 571                 } else if (ndx >= 0) {
 572                         enum logcode code = logfile_format_has_i ? FINFO : FCLIENT;
 573                         log_item(code, file, &stats, iflags, xname);
 574                 }
 575         }
 576 }
 577
 578
 579 /* Perform our quick-check heuristic for determining if a file is unchanged. */
 580 int unchanged_file(char *fn, struct file_struct *file, STRUCT_STAT *st)
 581 {
 582         if (st->st_size != F_LENGTH(file))
 583                 return 0;
 584
 585         /* if always checksum is set then we use the checksum instead
 586            of the file time to determine whether to sync */
 587         if (always_checksum && S_ISREG(st->st_mode)) {
 588                 char sum[MD4_SUM_LENGTH];
 589                 file_checksum(fn, sum, st->st_size);
 590                 return memcmp(sum, F_SUM(file), checksum_len) == 0;
 591         }
 592
 593         if (size_only)
 594                 return 1;
 595
 596         if (ignore_times)
 597                 return 0;
 598
 599         return cmp_time(st->st_mtime, file->modtime) == 0;
 600 }
 601
 602
 603 /*
 604  * set (initialize) the size entries in the per-file sum_struct
 605  * calculating dynamic block and checksum sizes.
 606  *
 607  * This is only called from generate_and_send_sums() but is a separate
 608  * function to encapsulate the logic.
 609  *
 610  * The block size is a rounded square root of file length.
 611  *
 612  * The checksum size is determined according to:
 613  *     blocksum_bits = BLOCKSUM_BIAS + 2*log2(file_len) - log2(block_len)
 614  * provided by Donovan Baarda which gives a probability of rsync
 615  * algorithm corrupting data and falling back using the whole md4
 616  * checksums.
 617  *
 618  * This might be made one of several selectable heuristics.
 619  */
 620 static void sum_sizes_sqroot(struct sum_struct *sum, int64 len)
 621 {
 622         int32 blength;
 623         int s2length;
 624
 625         if (block_size)
 626                 blength = block_size;
 627         else if (len <= BLOCK_SIZE * BLOCK_SIZE)
 628                 blength = BLOCK_SIZE;
 629         else {
 630                 int32 c;
 631                 int64 l;
 632                 int cnt;
 633                 for (c = 1, l = len, cnt = 0; l >>= 2; c <<= 1, cnt++) {}
 634                 if (cnt >= 31 || c >= MAX_BLOCK_SIZE)
 635                         blength = MAX_BLOCK_SIZE;
 636                 else {
 637                     blength = 0;
 638                     do {
 639                             blength |= c;
 640                             if (len < (int64)blength * blength)
 641                                     blength &= ~c;
 642                             c >>= 1;
 643                     } while (c >= 8);   /* round to multiple of 8 */
 644                     blength = MAX(blength, BLOCK_SIZE);
 645                 }
 646         }
 647
 648         if (protocol_version < 27) {
 649                 s2length = csum_length;
 650         } else if (csum_length == SUM_LENGTH) {
 651                 s2length = SUM_LENGTH;
 652         } else {
 653                 int32 c;
 654                 int64 l;
 655                 int b = BLOCKSUM_BIAS;
 656                 for (l = len; l >>= 1; b += 2) {}
 657                 for (c = blength; (c >>= 1) && b; b--) {}
 658                 /* add a bit, subtract rollsum, round up. */
 659                 s2length = (b + 1 - 32 + 7) / 8; /* --optimize in compiler-- */
 660                 s2length = MAX(s2length, csum_length);
 661                 s2length = MIN(s2length, SUM_LENGTH);
 662         }
 663
 664         sum->flength    = len;
 665         sum->blength    = blength;
 666         sum->s2length   = s2length;
 667         sum->remainder  = (int32)(len % blength);
 668         sum->count      = (int32)(len / blength) + (sum->remainder != 0);
 669
 670         if (sum->count && verbose > 2) {
 671                 rprintf(FINFO,
 672                         "count=%.0f rem=%ld blength=%ld s2length=%d flength=%.0f\n",
 673                         (double)sum->count, (long)sum->remainder, (long)sum->blength,
 674                         sum->s2length, (double)sum->flength);
 675         }
 676 }
 677
 678
 679 /*
 680  * Generate and send a stream of signatures/checksums that describe a buffer
 681  *
 682  * Generate approximately one checksum every block_len bytes.
 683  */
 684 static void generate_and_send_sums(int fd, OFF_T len, int f_out, int f_copy)
 685 {
 686         int32 i;
 687         struct map_struct *mapbuf;
 688         struct sum_struct sum;
 689         OFF_T offset = 0;
 690
 691         sum_sizes_sqroot(&sum, len);
 692         write_sum_head(f_out, &sum);
 693
 694         if (append_mode > 0 && f_copy < 0)
 695                 return;
 696
 697         if (len > 0)
 698                 mapbuf = map_file(fd, len, MAX_MAP_SIZE, sum.blength);
 699         else
 700                 mapbuf = NULL;
 701
 702         for (i = 0; i < sum.count; i++) {
 703                 int32 n1 = (int32)MIN(len, (OFF_T)sum.blength);
 704                 char *map = map_ptr(mapbuf, offset, n1);
 705                 char sum2[SUM_LENGTH];
 706                 uint32 sum1;
 707
 708                 len -= n1;
 709                 offset += n1;
 710
 711                 if (f_copy >= 0) {
 712                         full_write(f_copy, map, n1);
 713                         if (append_mode > 0)
 714                                 continue;
 715                 }
 716
 717                 sum1 = get_checksum1(map, n1);
 718                 get_checksum2(map, n1, sum2);
 719
 720                 if (verbose > 3) {
 721                         rprintf(FINFO,
 722                                 "chunk[%.0f] offset=%.0f len=%ld sum1=%08lx\n",
 723                                 (double)i, (double)offset - n1, (long)n1,
 724                                 (unsigned long)sum1);
 725                 }
 726                 write_int(f_out, sum1);
 727                 write_buf(f_out, sum2, sum.s2length);
 728         }
 729
 730         if (mapbuf)
 731                 unmap_file(mapbuf);
 732 }
 733
 734
 735 /* Try to find a filename in the same dir as "fname" with a similar name. */
 736 static int find_fuzzy(struct file_struct *file, struct file_list *dirlist)
 737 {
 738         int fname_len, fname_suf_len;
 739         const char *fname_suf, *fname = F_BASENAME(file);
 740         uint32 lowest_dist = 25 << 16; /* ignore a distance greater than 25 */
 741         int j, lowest_j = -1;
 742
 743         fname_len = strlen(fname);
 744         fname_suf = find_filename_suffix(fname, fname_len, &fname_suf_len);
 745
 746         for (j = 0; j < dirlist->count; j++) {
 747                 struct file_struct *fp = dirlist->files[j];
 748                 const char *suf, *name;
 749                 int len, suf_len;
 750                 uint32 dist;
 751
 752                 if (!S_ISREG(fp->mode) || !F_LENGTH(fp) || fp->flags & FLAG_SENT)
 753                         continue;
 754
 755                 name = F_BASENAME(fp);
 756
 757                 if (F_LENGTH(fp) == F_LENGTH(file)
 758                     && cmp_time(fp->modtime, file->modtime) == 0) {
 759                         if (verbose > 4) {
 760                                 rprintf(FINFO,
 761                                         "fuzzy size/modtime match for %s\n",
 762                                         name);
 763                         }
 764                         return j;
 765                 }
 766
 767                 len = strlen(name);
 768                 suf = find_filename_suffix(name, len, &suf_len);
 769
 770                 dist = fuzzy_distance(name, len, fname, fname_len);
 771                 /* Add some extra weight to how well the suffixes match. */
 772                 dist += fuzzy_distance(suf, suf_len, fname_suf, fname_suf_len)
 773                       * 10;
 774                 if (verbose > 4) {
 775                         rprintf(FINFO, "fuzzy distance for %s = %d.%05d\n",
 776                                 name, (int)(dist>>16), (int)(dist&0xFFFF));
 777                 }
 778                 if (dist <= lowest_dist) {
 779                         lowest_dist = dist;
 780                         lowest_j = j;
 781                 }
 782         }
 783
 784         return lowest_j;
 785 }
 786
 787 #ifdef SUPPORT_HARD_LINKS
 788 void check_for_finished_hlinks(int itemizing, enum logcode code)
 789 {
 790         struct file_struct *file;
 791         int ndx;
 792
 793         while ((ndx = get_hlink_num()) != -1) {
 794                 if (ndx < 0 || ndx >= the_file_list->count)
 795                         continue;
 796
 797                 file = the_file_list->files[ndx];
 798                 if (!F_IS_HLINKED(file))
 799                         continue;
 800
 801                 hard_link_cluster(file, ndx, itemizing, code, -1);
 802         }
 803 }
 804 #endif
 805
 806 /* This is only called for regular files.  We return -2 if we've finished
 807  * handling the file, -1 if no dest-linking occurred, or a non-negative
 808  * value if we found an alternate basis file. */
 809 static int try_dests_reg(struct file_struct *file, char *fname, int ndx,
 810                          char *cmpbuf, STRUCT_STAT *stp, int itemizing,
 811                          int maybe_ATTRS_REPORT, enum logcode code)
 812 {
 813         int best_match = -1;
 814         int match_level = 0;
 815         int j = 0;
 816
 817         do {
 818                 pathjoin(cmpbuf, MAXPATHLEN, basis_dir[j], fname);
 819                 if (link_stat(cmpbuf, stp, 0) < 0 || !S_ISREG(stp->st_mode))
 820                         continue;
 821                 switch (match_level) {
 822                 case 0:
 823                         best_match = j;
 824                         match_level = 1;
 825                         /* FALL THROUGH */
 826                 case 1:
 827                         if (!unchanged_file(cmpbuf, file, stp))
 828                                 continue;
 829                         best_match = j;
 830                         match_level = 2;
 831                         /* FALL THROUGH */
 832                 case 2:
 833                         if (!unchanged_attrs(file, stp))
 834                                 continue;
 835                         if (always_checksum && preserve_times
 836                          && cmp_time(stp->st_mtime, file->modtime))
 837                                 continue;
 838                         best_match = j;
 839                         match_level = 3;
 840                         break;
 841                 }
 842                 break;
 843         } while (basis_dir[++j] != NULL);
 844
 845         if (!match_level)
 846                 return -1;
 847
 848         if (j != best_match) {
 849                 j = best_match;
 850                 pathjoin(cmpbuf, MAXPATHLEN, basis_dir[j], fname);
 851                 if (link_stat(cmpbuf, stp, 0) < 0)
 852                         return -1;
 853         }
 854
 855         if (match_level == 3 && !copy_dest) {
 856 #ifdef SUPPORT_HARD_LINKS
 857                 if (link_dest) {
 858                         int i = itemizing && (verbose > 1 || stdout_format_has_i > 1);
 859                         if (hard_link_one(file, ndx, fname, 0, stp,
 860                                           cmpbuf, 1, i, code) < 0)
 861                                 goto try_a_copy;
 862                         if (preserve_hard_links && F_IS_HLINKED(file))
 863                                 hard_link_cluster(file, ndx, itemizing, code, j);
 864                 } else
 865 #endif
 866                 if (itemizing)
 867                         itemize(file, ndx, 0, stp, 0, 0, NULL);
 868                 if (verbose > 1 && maybe_ATTRS_REPORT) {
 869                         rprintf(FCLIENT, "%s is uptodate\n", fname);
 870                 }
 871                 return -2;
 872         }
 873
 874         if (match_level >= 2) {
 875           try_a_copy: /* Copy the file locally. */
 876                 if (copy_file(cmpbuf, fname, file->mode) < 0) {
 877                         if (verbose) {
 878                                 rsyserr(FINFO, errno, "copy_file %s => %s",
 879                                         full_fname(cmpbuf), fname);
 880                         }
 881                         return -1;
 882                 }
 883                 if (itemizing)
 884                         itemize(file, ndx, 0, stp, ITEM_LOCAL_CHANGE, 0, NULL);
 885                 set_file_attrs(fname, file, NULL, 0);
 886                 if (maybe_ATTRS_REPORT
 887                  && ((!itemizing && verbose && match_level == 2)
 888                   || (verbose > 1 && match_level == 3))) {
 889                         code = match_level == 3 ? FCLIENT : FINFO;
 890                         rprintf(code, "%s%s\n", fname,
 891                                 match_level == 3 ? " is uptodate" : "");
 892                 }
 893 #ifdef SUPPORT_HARD_LINKS
 894                 if (preserve_hard_links && F_IS_HLINKED(file))
 895                         hard_link_cluster(file, ndx, itemizing, code, j);
 896 #endif
 897                 return -2;
 898         }
 899
 900         return FNAMECMP_BASIS_DIR_LOW + j;
 901 }
 902
 903 /* This is only called for non-regular files.  We return -2 if we've finished
 904  * handling the file, or -1 if no dest-linking occurred, or a non-negative
 905  * value if we found an alternate basis file. */
 906 static int try_dests_non(struct file_struct *file, char *fname, int ndx,
 907                          char *cmpbuf, STRUCT_STAT *stp, int itemizing,
 908                          int maybe_ATTRS_REPORT, enum logcode code)
 909 {
 910         char lnk[MAXPATHLEN];
 911         int best_match = -1;
 912         int match_level = 0;
 913         uint32 *devp;
 914         enum nonregtype type;
 915         int len, j = 0;
 916
 917 #ifndef SUPPORT_LINKS
 918         if (S_ISLNK(file->mode))
 919                 return -1;
 920 #endif
 921         if (S_ISDIR(file->mode)) {
 922                 type = TYPE_DIR;
 923         } else if (IS_SPECIAL(file->mode))
 924                 type = TYPE_SPECIAL;
 925         else if (IS_DEVICE(file->mode))
 926                 type = TYPE_DEVICE;
 927 #ifdef SUPPORT_LINKS
 928         else if (S_ISLNK(file->mode))
 929                 type = TYPE_SYMLINK;
 930 #endif
 931         else {
 932                 rprintf(FERROR,
 933                         "internal: try_dests_non() called with invalid mode (%o)\n",
 934                         (int)file->mode);
 935                 exit_cleanup(RERR_UNSUPPORTED);
 936         }
 937
 938         do {
 939                 pathjoin(cmpbuf, MAXPATHLEN, basis_dir[j], fname);
 940                 if (link_stat(cmpbuf, stp, 0) < 0)
 941                         continue;
 942                 switch (type) {
 943                 case TYPE_DIR:
 944                         if (!S_ISDIR(stp->st_mode))
 945                                 continue;
 946                         break;
 947                 case TYPE_SPECIAL:
 948                         if (!IS_SPECIAL(stp->st_mode))
 949                                 continue;
 950                         break;
 951                 case TYPE_DEVICE:
 952                         if (!IS_DEVICE(stp->st_mode))
 953                                 continue;
 954                         break;
 955 #ifdef SUPPORT_LINKS
 956                 case TYPE_SYMLINK:
 957                         if (!S_ISLNK(stp->st_mode))
 958                                 continue;
 959                         break;
 960 #endif
 961                 }
 962                 if (match_level < 1) {
 963                         match_level = 1;
 964                         best_match = j;
 965                 }
 966                 switch (type) {
 967                 case TYPE_DIR:
 968                         break;
 969                 case TYPE_SPECIAL:
 970                 case TYPE_DEVICE:
 971                         devp = F_RDEV_P(file);
 972                         if (stp->st_rdev != MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp)))
 973                                 continue;
 974                         break;
 975 #ifdef SUPPORT_LINKS
 976                 case TYPE_SYMLINK:
 977                         if ((len = readlink(cmpbuf, lnk, MAXPATHLEN-1)) <= 0)
 978                                 continue;
 979                         lnk[len] = '\0';
 980                         if (strcmp(lnk, F_SYMLINK(file)) != 0)
 981                                 continue;
 982                         break;
 983 #endif
 984                 }
 985                 if (match_level < 2) {
 986                         match_level = 2;
 987                         best_match = j;
 988                 }
 989                 if (unchanged_attrs(file, stp)) {
 990                         match_level = 3;
 991                         best_match = j;
 992                         break;
 993                 }
 994         } while (basis_dir[++j] != NULL);
 995
 996         if (!match_level)
 997                 return -1;
 998
 999         if (j != best_match) {
1000                 j = best_match;
1001                 pathjoin(cmpbuf, MAXPATHLEN, basis_dir[j], fname);
1002                 if (link_stat(cmpbuf, stp, 0) < 0)
1003                         return -1;
1004         }
1005
1006         if (match_level == 3) {
1007 #ifdef SUPPORT_HARD_LINKS
1008                 if (link_dest
1009 #ifndef CAN_HARDLINK_SYMLINK
1010                  && !S_ISLNK(file->mode)
1011 #endif
1012 #ifndef CAN_HARDLINK_SPECIAL
1013                  && !IS_SPECIAL(file->mode) && !IS_DEVICE(file->mode)
1014 #endif
1015                  && !S_ISDIR(file->mode)) {
1016                         if (do_link(cmpbuf, fname) < 0) {
1017                                 rsyserr(FERROR, errno,
1018                                         "failed to hard-link %s with %s",
1019                                         cmpbuf, fname);
1020                                 return j;
1021                         }
1022                         if (preserve_hard_links && F_IS_HLINKED(file))
1023                                 hard_link_cluster(file, ndx, itemizing, code, -1);
1024                 } else
1025 #endif
1026                         match_level = 2;
1027                 if (itemizing && stdout_format_has_i
1028                  && (verbose > 1 || stdout_format_has_i > 1)) {
1029                         int chg = compare_dest && type != TYPE_DIR ? 0
1030                             : ITEM_LOCAL_CHANGE
1031                              + (match_level == 3 ? ITEM_XNAME_FOLLOWS : 0);
1032                         char *lp = match_level == 3 ? "" : NULL;
1033                         itemize(file, ndx, 0, stp, chg + ITEM_MATCHED, 0, lp);
1034                 }
1035                 if (verbose > 1 && maybe_ATTRS_REPORT) {
1036                         rprintf(FCLIENT, "%s%s is uptodate\n",
1037                                 fname, type == TYPE_DIR ? "/" : "");
1038                 }
1039                 return -2;
1040         }
1041
1042         return j;
1043 }
1044
1045 static int phase = 0;
1046
1047 /* Acts on the_file_list->file's ndx'th item, whose name is fname.  If a dir,
1048  * make sure it exists, and has the right permissions/timestamp info.  For
1049  * all other non-regular files (symlinks, etc.) we create them here.  For
1050  * regular files that have changed, we try to find a basis file and then
1051  * start sending checksums.
1052  *
1053  * When fname is non-null, it must point to a MAXPATHLEN buffer!
1054  *
1055  * Note that f_out is set to -1 when doing final directory-permission and
1056  * modification-time repair. */
1057 static void recv_generator(char *fname, struct file_struct *file, int ndx,
1058                            int itemizing, int maybe_ATTRS_REPORT,
1059                            enum logcode code, int f_out)
1060 {
1061         static int missing_below = -1, excluded_below = -1;
1062         static const char *parent_dirname = "";
1063         static struct file_list *fuzzy_dirlist = NULL;
1064         static int need_fuzzy_dirlist = 0;
1065         struct file_struct *fuzzy_file = NULL;
1066         int fd = -1, f_copy = -1;
1067         STRUCT_STAT st, real_st, partial_st;
1068         struct file_struct *back_file = NULL;
1069         int statret, real_ret, stat_errno;
1070         char *fnamecmp, *partialptr, *backupptr = NULL;
1071         char fnamecmpbuf[MAXPATHLEN];
1072         uchar fnamecmp_type;
1073         int del_opts = delete_mode || force_delete ? DEL_RECURSE : 0;
1074
1075         if (list_only)
1076                 return;
1077
1078         if (!fname) {
1079                 if (fuzzy_dirlist) {
1080                         flist_free(fuzzy_dirlist);
1081                         fuzzy_dirlist = NULL;
1082                 }
1083                 if (missing_below >= 0) {
1084                         if (dry_run)
1085                                 dry_run--;
1086                         missing_below = -1;
1087                 }
1088                 parent_dirname = "";
1089                 return;
1090         }
1091
1092         if (verbose > 2)
1093                 rprintf(FINFO, "recv_generator(%s,%d)\n", fname, ndx);
1094
1095         if (server_filter_list.head) {
1096                 if (excluded_below >= 0) {
1097                         if (file->dir.depth > excluded_below)
1098                                 goto skipping;
1099                         excluded_below = -1;
1100                 }
1101                 if (check_filter(&server_filter_list, fname,
1102                                  S_ISDIR(file->mode)) < 0) {
1103                         if (S_ISDIR(file->mode))
1104                                 excluded_below = file->dir.depth;
1105                   skipping:
1106                         if (verbose) {
1107                                 rprintf(FINFO,
1108                                         "skipping server-excluded file \"%s\"\n",
1109                                         fname);
1110                         }
1111                         return;
1112                 }
1113         }
1114
1115         if (missing_below >= 0) {
1116                 if (file->dir.depth <= missing_below) {
1117                         if (dry_run)
1118                                 dry_run--;
1119                         missing_below = -1;
1120                 } else if (!dry_run)
1121                         return;
1122         }
1123         if (dry_run > 1) {
1124                 statret = -1;
1125                 stat_errno = ENOENT;
1126         } else {
1127                 const char *dn = file->dirname ? file->dirname : ".";
1128                 if (parent_dirname != dn && strcmp(parent_dirname, dn) != 0) {
1129                         if (relative_paths && !implied_dirs
1130                          && do_stat(dn, &st) < 0
1131                          && create_directory_path(fname) < 0) {
1132                                 rsyserr(FERROR, errno,
1133                                         "recv_generator: mkdir %s failed",
1134                                         full_fname(dn));
1135                         }
1136                         if (fuzzy_dirlist) {
1137                                 flist_free(fuzzy_dirlist);
1138                                 fuzzy_dirlist = NULL;
1139                         }
1140                         if (fuzzy_basis)
1141                                 need_fuzzy_dirlist = 1;
1142                 }
1143                 parent_dirname = dn;
1144
1145                 if (need_fuzzy_dirlist && S_ISREG(file->mode)) {
1146                         strlcpy(fnamecmpbuf, dn, sizeof fnamecmpbuf);
1147                         fuzzy_dirlist = get_dirlist(fnamecmpbuf, -1, 1);
1148                         need_fuzzy_dirlist = 0;
1149                 }
1150
1151                 statret = link_stat(fname, &st,
1152                                     keep_dirlinks && S_ISDIR(file->mode));
1153                 stat_errno = errno;
1154         }
1155
1156         if (ignore_non_existing && statret == -1 && stat_errno == ENOENT) {
1157                 if (verbose > 1) {
1158                         rprintf(FINFO, "not creating new %s \"%s\"\n",
1159                                 S_ISDIR(file->mode) ? "directory" : "file",
1160                                 fname);
1161                 }
1162                 return;
1163         }
1164
1165         /* If we're not preserving permissions, change the file-list's
1166          * mode based on the local permissions and some heuristics. */
1167         if (!preserve_perms) {
1168                 int exists = statret == 0
1169                           && S_ISDIR(st.st_mode) == S_ISDIR(file->mode);
1170                 file->mode = dest_mode(file->mode, st.st_mode, exists);
1171         }
1172
1173         if (S_ISDIR(file->mode)) {
1174                 /* The file to be received is a directory, so we need
1175                  * to prepare appropriately.  If there is already a
1176                  * file of that name and it is *not* a directory, then
1177                  * we need to delete it.  If it doesn't exist, then
1178                  * (perhaps recursively) create it. */
1179                 if (statret == 0 && !S_ISDIR(st.st_mode)) {
1180                         if (delete_item(fname, st.st_mode, "directory", del_opts) != 0)
1181                                 return;
1182                         statret = -1;
1183                 }
1184                 if (dry_run && statret != 0 && missing_below < 0) {
1185                         missing_below = file->dir.depth;
1186                         dry_run++;
1187                 }
1188                 real_ret = statret;
1189                 real_st = st;
1190                 if (new_root_dir) {
1191                         if (*fname == '.' && fname[1] == '\0')
1192                                 statret = -1;
1193                         new_root_dir = 0;
1194                 }
1195                 if (statret != 0 && basis_dir[0] != NULL) {
1196                         int j = try_dests_non(file, fname, ndx, fnamecmpbuf, &st,
1197                                               itemizing, maybe_ATTRS_REPORT, code);
1198                         if (j == -2) {
1199                                 itemizing = 0;
1200                                 code = FNONE;
1201                         } else if (j >= 0)
1202                                 statret = 1;
1203                 }
1204                 if (itemizing && f_out != -1) {
1205                         itemize(file, ndx, statret, &st,
1206                                 statret ? ITEM_LOCAL_CHANGE : 0, 0, NULL);
1207                 }
1208                 if (real_ret != 0 && do_mkdir(fname,file->mode) < 0 && errno != EEXIST) {
1209                         if (!relative_paths || errno != ENOENT
1210                             || create_directory_path(fname) < 0
1211                             || (do_mkdir(fname, file->mode) < 0 && errno != EEXIST)) {
1212                                 rsyserr(FERROR, errno,
1213                                         "recv_generator: mkdir %s failed",
1214                                         full_fname(fname));
1215                                 file->flags |= FLAG_MISSING_DIR;
1216                                 if (ndx+1 < the_file_list->count
1217                                  && the_file_list->files[ndx+1]->dir.depth > file->dir.depth) {
1218                                         rprintf(FERROR,
1219                                             "*** Skipping everything below this failed directory ***\n");
1220                                         missing_below = file->dir.depth;
1221                                 }
1222                                 return;
1223                         }
1224                 }
1225                 if (set_file_attrs(fname, file, real_ret ? NULL : &real_st, 0)
1226                     && verbose && code != FNONE && f_out != -1)
1227                         rprintf(code, "%s/\n", fname);
1228                 if (real_ret != 0 && one_file_system)
1229                         real_st.st_dev = filesystem_dev;
1230                 if (delete_during && f_out != -1 && !phase && dry_run < 2
1231                     && (file->flags & FLAG_XFER_DIR))
1232                         delete_in_dir(the_file_list, fname, file, &real_st);
1233                 return;
1234         }
1235
1236 #ifdef SUPPORT_HARD_LINKS
1237         if (preserve_hard_links && F_IS_HLINKED(file)
1238             && hard_link_check(file, ndx, fname, statret, &st,
1239                                itemizing, code, HL_CHECK_MASTER))
1240                 return;
1241 #endif
1242
1243         if (preserve_links && S_ISLNK(file->mode)) {
1244 #ifdef SUPPORT_LINKS
1245                 const char *sl = F_SYMLINK(file);
1246                 if (safe_symlinks && unsafe_symlink(sl, fname)) {
1247                         if (verbose) {
1248                                 if (solo_file)
1249                                         fname = f_name(file, NULL);
1250                                 rprintf(FINFO,
1251                                         "ignoring unsafe symlink %s -> \"%s\"\n",
1252                                         full_fname(fname), sl);
1253                         }
1254                         return;
1255                 }
1256                 if (statret == 0) {
1257                         char lnk[MAXPATHLEN];
1258                         int len;
1259
1260                         if (!S_ISLNK(st.st_mode))
1261                                 statret = -1;
1262                         else if ((len = readlink(fname, lnk, MAXPATHLEN-1)) > 0
1263                               && strncmp(lnk, sl, len) == 0 && sl[len] == '\0') {
1264                                 /* The link is pointing to the right place. */
1265                                 if (itemizing)
1266                                         itemize(file, ndx, 0, &st, 0, 0, NULL);
1267                                 set_file_attrs(fname, file, &st, maybe_ATTRS_REPORT);
1268 #ifdef SUPPORT_HARD_LINKS
1269                                 if (preserve_hard_links && F_IS_HLINKED(file))
1270                                         hard_link_cluster(file, ndx, itemizing, code, -1);
1271 #endif
1272                                 if (remove_source_files == 1)
1273                                         goto return_with_success;
1274                                 return;
1275                         }
1276                         /* Not the right symlink (or not a symlink), so
1277                          * delete it. */
1278                         if (delete_item(fname, st.st_mode, "symlink", del_opts) != 0)
1279                                 return;
1280                 } else if (basis_dir[0] != NULL) {
1281                         int j = try_dests_non(file, fname, ndx, fnamecmpbuf, &st,
1282                                               itemizing, maybe_ATTRS_REPORT, code);
1283                         if (j == -2) {
1284 #ifndef CAN_HARDLINK_SYMLINK
1285                                 if (link_dest) {
1286                                         /* Resort to --copy-dest behavior. */
1287                                 } else
1288 #endif
1289                                 if (!copy_dest)
1290                                         return;
1291                                 itemizing = 0;
1292                                 code = FNONE;
1293                         } else if (j >= 0)
1294                                 statret = 1;
1295                 }
1296 #ifdef SUPPORT_HARD_LINKS
1297                 if (preserve_hard_links && F_IS_HLINKED(file)
1298                     && hard_link_check(file, ndx, fname, -1, &st,
1299                                        itemizing, code, HL_SKIP))
1300                         return;
1301 #endif
1302                 if (do_symlink(sl, fname) != 0) {
1303                         rsyserr(FERROR, errno, "symlink %s -> \"%s\" failed",
1304                                 full_fname(fname), sl);
1305                 } else {
1306                         set_file_attrs(fname, file, NULL, 0);
1307                         if (itemizing) {
1308                                 itemize(file, ndx, statret, &st,
1309                                         ITEM_LOCAL_CHANGE, 0, NULL);
1310                         }
1311                         if (code != FNONE && verbose)
1312                                 rprintf(code, "%s -> %s\n", fname, sl);
1313 #ifdef SUPPORT_HARD_LINKS
1314                         if (preserve_hard_links && F_IS_HLINKED(file))
1315                                 hard_link_cluster(file, ndx, itemizing, code, -1);
1316 #endif
1317                         /* This does not check remove_source_files == 1
1318                          * because this is one of the items that the old
1319                          * --remove-sent-files option would remove. */
1320                         if (remove_source_files)
1321                                 goto return_with_success;
1322                 }
1323 #endif
1324                 return;
1325         }
1326
1327         if ((am_root && preserve_devices && IS_DEVICE(file->mode))
1328          || (preserve_specials && IS_SPECIAL(file->mode))) {
1329                 uint32 *devp = F_RDEV_P(file);
1330                 dev_t rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp));
1331                 if (statret == 0) {
1332                         char *t;
1333                         if (IS_DEVICE(file->mode)) {
1334                                 if (!IS_DEVICE(st.st_mode))
1335                                         statret = -1;
1336                                 t = "device file";
1337                         } else {
1338                                 if (!IS_SPECIAL(st.st_mode))
1339                                         statret = -1;
1340                                 t = "special file";
1341                         }
1342                         if (statret == 0
1343                          && (st.st_mode & ~CHMOD_BITS) == (file->mode & ~CHMOD_BITS)
1344                          && st.st_rdev == rdev) {
1345                                 /* The device or special file is identical. */
1346                                 if (itemizing)
1347                                         itemize(file, ndx, 0, &st, 0, 0, NULL);
1348                                 set_file_attrs(fname, file, &st, maybe_ATTRS_REPORT);
1349 #ifdef SUPPORT_HARD_LINKS
1350                                 if (preserve_hard_links && F_IS_HLINKED(file))
1351                                         hard_link_cluster(file, ndx, itemizing, code, -1);
1352 #endif
1353                                 if (remove_source_files == 1)
1354                                         goto return_with_success;
1355                                 return;
1356                         }
1357                         if (delete_item(fname, st.st_mode, t, del_opts) != 0)
1358                                 return;
1359                 } else if (basis_dir[0] != NULL) {
1360                         int j = try_dests_non(file, fname, ndx, fnamecmpbuf, &st,
1361                                               itemizing, maybe_ATTRS_REPORT, code);
1362                         if (j == -2) {
1363 #ifndef CAN_HARDLINK_SPECIAL
1364                                 if (link_dest) {
1365                                         /* Resort to --copy-dest behavior. */
1366                                 } else
1367 #endif
1368                                 if (!copy_dest)
1369                                         return;
1370                                 itemizing = 0;
1371                                 code = FNONE;
1372                         } else if (j >= 0)
1373                                 statret = 1;
1374                 }
1375 #ifdef SUPPORT_HARD_LINKS
1376                 if (preserve_hard_links && F_IS_HLINKED(file)
1377                     && hard_link_check(file, ndx, fname, -1, &st,
1378                                        itemizing, code, HL_SKIP))
1379                         return;
1380 #endif
1381                 if (verbose > 2) {
1382                         rprintf(FINFO, "mknod(%s, 0%o, [%ld,%ld])\n",
1383                                 fname, (int)file->mode,
1384                                 (long)major(rdev), (long)minor(rdev));
1385                 }
1386                 if (do_mknod(fname, file->mode, rdev) < 0) {
1387                         rsyserr(FERROR, errno, "mknod %s failed",
1388                                 full_fname(fname));
1389                 } else {
1390                         set_file_attrs(fname, file, NULL, 0);
1391                         if (itemizing) {
1392                                 itemize(file, ndx, statret, &st,
1393                                         ITEM_LOCAL_CHANGE, 0, NULL);
1394                         }
1395                         if (code != FNONE && verbose)
1396                                 rprintf(code, "%s\n", fname);
1397 #ifdef SUPPORT_HARD_LINKS
1398                         if (preserve_hard_links && F_IS_HLINKED(file))
1399                                 hard_link_cluster(file, ndx, itemizing, code, -1);
1400 #endif
1401                         if (remove_source_files == 1)
1402                                 goto return_with_success;
1403                 }
1404                 return;
1405         }
1406
1407         if (!S_ISREG(file->mode)) {
1408                 if (solo_file)
1409                         fname = f_name(file, NULL);
1410                 rprintf(FINFO, "skipping non-regular file \"%s\"\n", fname);
1411                 return;
1412         }
1413
1414         if (max_size && F_LENGTH(file) > max_size) {
1415                 if (verbose > 1) {
1416                         if (solo_file)
1417                                 fname = f_name(file, NULL);
1418                         rprintf(FINFO, "%s is over max-size\n", fname);
1419                 }
1420                 return;
1421         }
1422         if (min_size && F_LENGTH(file) < min_size) {
1423                 if (verbose > 1) {
1424                         if (solo_file)
1425                                 fname = f_name(file, NULL);
1426                         rprintf(FINFO, "%s is under min-size\n", fname);
1427                 }
1428                 return;
1429         }
1430
1431         if (ignore_existing && statret == 0) {
1432                 if (verbose > 1)
1433                         rprintf(FINFO, "%s exists\n", fname);
1434                 return;
1435         }
1436
1437         if (update_only && statret == 0
1438             && cmp_time(st.st_mtime, file->modtime) > 0) {
1439                 if (verbose > 1)
1440                         rprintf(FINFO, "%s is newer\n", fname);
1441                 return;
1442         }
1443
1444         fnamecmp = fname;
1445         fnamecmp_type = FNAMECMP_FNAME;
1446
1447         if (statret == 0 && !S_ISREG(st.st_mode)) {
1448                 if (delete_item(fname, st.st_mode, "regular file", del_opts) != 0)
1449                         return;
1450                 statret = -1;
1451                 stat_errno = ENOENT;
1452         }
1453
1454         if (statret != 0 && basis_dir[0] != NULL) {
1455                 int j = try_dests_reg(file, fname, ndx, fnamecmpbuf, &st,
1456                                       itemizing, maybe_ATTRS_REPORT, code);
1457                 if (j == -2) {
1458                         if (remove_source_files == 1)
1459                                 goto return_with_success;
1460                         return;
1461                 }
1462                 if (j >= 0) {
1463                         fnamecmp = fnamecmpbuf;
1464                         fnamecmp_type = j;
1465                         statret = 0;
1466                 }
1467         }
1468
1469         real_ret = statret;
1470         real_st = st;
1471
1472         if (partial_dir && (partialptr = partial_dir_fname(fname)) != NULL
1473             && link_stat(partialptr, &partial_st, 0) == 0
1474             && S_ISREG(partial_st.st_mode)) {
1475                 if (statret != 0)
1476                         goto prepare_to_open;
1477         } else
1478                 partialptr = NULL;
1479
1480         if (statret != 0 && fuzzy_dirlist && dry_run <= 1) {
1481                 int j = find_fuzzy(file, fuzzy_dirlist);
1482                 if (j >= 0) {
1483                         fuzzy_file = fuzzy_dirlist->files[j];
1484                         f_name(fuzzy_file, fnamecmpbuf);
1485                         if (verbose > 2) {
1486                                 rprintf(FINFO, "fuzzy basis selected for %s: %s\n",
1487                                         fname, fnamecmpbuf);
1488                         }
1489                         st.st_size = F_LENGTH(fuzzy_file);
1490                         statret = 0;
1491                         fnamecmp = fnamecmpbuf;
1492                         fnamecmp_type = FNAMECMP_FUZZY;
1493                 }
1494         }
1495
1496         if (statret != 0) {
1497 #ifdef SUPPORT_HARD_LINKS
1498                 if (preserve_hard_links && F_IS_HLINKED(file)
1499                     && hard_link_check(file, ndx, fname, statret, &st,
1500                                        itemizing, code, HL_SKIP))
1501                         return;
1502 #endif
1503                 if (stat_errno == ENOENT)
1504                         goto notify_others;
1505                 rsyserr(FERROR, stat_errno, "recv_generator: failed to stat %s",
1506                         full_fname(fname));
1507                 return;
1508         }
1509
1510         if (append_mode && st.st_size > F_LENGTH(file))
1511                 return;
1512
1513         if (fnamecmp_type <= FNAMECMP_BASIS_DIR_HIGH)
1514                 ;
1515         else if (fnamecmp_type == FNAMECMP_FUZZY)
1516                 ;
1517         else if (unchanged_file(fnamecmp, file, &st)) {
1518                 if (partialptr) {
1519                         do_unlink(partialptr);
1520                         handle_partial_dir(partialptr, PDIR_DELETE);
1521                 }
1522                 if (itemizing) {
1523                         itemize(file, ndx, real_ret, &real_st,
1524                                 0, 0, NULL);
1525                 }
1526                 set_file_attrs(fname, file, &st, maybe_ATTRS_REPORT);
1527 #ifdef SUPPORT_HARD_LINKS
1528                 if (preserve_hard_links && F_IS_HLINKED(file))
1529                         hard_link_cluster(file, ndx, itemizing, code, -1);
1530 #endif
1531                 if (remove_source_files != 1)
1532                         return;
1533           return_with_success:
1534                 if (!dry_run)
1535                         send_msg_int(MSG_SUCCESS, ndx);
1536                 return;
1537         }
1538
1539   prepare_to_open:
1540         if (partialptr) {
1541                 st = partial_st;
1542                 fnamecmp = partialptr;
1543                 fnamecmp_type = FNAMECMP_PARTIAL_DIR;
1544                 statret = 0;
1545         }
1546
1547         if (!do_xfers || read_batch || whole_file)
1548                 goto notify_others;
1549
1550         if (fuzzy_dirlist) {
1551                 int j = flist_find(fuzzy_dirlist, file);
1552                 if (j >= 0) /* don't use changing file as future fuzzy basis */
1553                         fuzzy_dirlist->files[j]->flags |= FLAG_SENT;
1554         }
1555
1556         /* open the file */
1557         fd = do_open(fnamecmp, O_RDONLY, 0);
1558
1559         if (fd == -1) {
1560                 rsyserr(FERROR, errno, "failed to open %s, continuing",
1561                         full_fname(fnamecmp));
1562           pretend_missing:
1563                 /* pretend the file didn't exist */
1564 #ifdef SUPPORT_HARD_LINKS
1565                 if (preserve_hard_links && F_IS_HLINKED(file)
1566                     && hard_link_check(file, ndx, fname, statret, &st,
1567                                        itemizing, code, HL_SKIP))
1568                         return;
1569 #endif
1570                 statret = real_ret = -1;
1571                 goto notify_others;
1572         }
1573
1574         if (inplace && make_backups && fnamecmp_type == FNAMECMP_FNAME) {
1575                 if (!(backupptr = get_backup_name(fname))) {
1576                         close(fd);
1577                         return;
1578                 }
1579                 if (!(back_file = make_file(fname, NULL, NULL, 0, NO_FILTERS))) {
1580                         close(fd);
1581                         goto pretend_missing;
1582                 }
1583                 if (robust_unlink(backupptr) && errno != ENOENT) {
1584                         rsyserr(FERROR, errno, "unlink %s",
1585                                 full_fname(backupptr));
1586                         unmake_file(back_file);
1587                         close(fd);
1588                         return;
1589                 }
1590                 if ((f_copy = do_open(backupptr,
1591                     O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0600)) < 0) {
1592                         rsyserr(FERROR, errno, "open %s",
1593                                 full_fname(backupptr));
1594                         unmake_file(back_file);
1595                         close(fd);
1596                         return;
1597                 }
1598                 fnamecmp_type = FNAMECMP_BACKUP;
1599         }
1600
1601         if (verbose > 3) {
1602                 rprintf(FINFO, "gen mapped %s of size %.0f\n",
1603                         fnamecmp, (double)st.st_size);
1604         }
1605
1606         if (verbose > 2)
1607                 rprintf(FINFO, "generating and sending sums for %d\n", ndx);
1608
1609   notify_others:
1610         if (remove_source_files && !delay_updates && !phase)
1611                 increment_active_files(ndx, itemizing, code);
1612         write_int(f_out, ndx);
1613         if (itemizing) {
1614                 int iflags = ITEM_TRANSFER;
1615                 if (always_checksum)
1616                         iflags |= ITEM_REPORT_CHECKSUM;
1617                 if (fnamecmp_type != FNAMECMP_FNAME)
1618                         iflags |= ITEM_BASIS_TYPE_FOLLOWS;
1619                 if (fnamecmp_type == FNAMECMP_FUZZY)
1620                         iflags |= ITEM_XNAME_FOLLOWS;
1621                 itemize(file, -1, real_ret, &real_st, iflags, fnamecmp_type,
1622                         fuzzy_file ? F_BASENAME(fuzzy_file) : NULL);
1623         }
1624
1625         if (!do_xfers) {
1626 #ifdef SUPPORT_HARD_LINKS
1627                 if (preserve_hard_links && F_IS_HLINKED(file))
1628                         hard_link_cluster(file, ndx, itemizing, code, -1);
1629 #endif
1630                 return;
1631         }
1632         if (read_batch)
1633                 return;
1634
1635         if (statret != 0 || whole_file) {
1636                 write_sum_head(f_out, NULL);
1637                 return;
1638         }
1639
1640         generate_and_send_sums(fd, st.st_size, f_out, f_copy);
1641
1642         if (f_copy >= 0) {
1643                 close(f_copy);
1644                 set_file_attrs(backupptr, back_file, NULL, 0);
1645                 if (verbose > 1) {
1646                         rprintf(FINFO, "backed up %s to %s\n",
1647                                 fname, backupptr);
1648                 }
1649                 unmake_file(back_file);
1650         }
1651
1652         close(fd);
1653 }
1654
1655 void generate_files(int f_out, struct file_list *flist, char *local_name)
1656 {
1657         int i;
1658         char fbuf[MAXPATHLEN];
1659         int itemizing, maybe_ATTRS_REPORT;
1660         enum logcode code;
1661         int lull_mod = allowed_lull * 5;
1662         int need_retouch_dir_times = preserve_times && !omit_dir_times;
1663         int need_retouch_dir_perms = 0;
1664         int save_ignore_existing = ignore_existing;
1665         int save_ignore_non_existing = ignore_non_existing;
1666         int save_do_progress = do_progress;
1667         int save_make_backups = make_backups;
1668         int dir_tweaking = !(list_only || local_name || dry_run);
1669
1670         if (protocol_version >= 29) {
1671                 itemizing = 1;
1672                 maybe_ATTRS_REPORT = stdout_format_has_i ? 0 : ATTRS_REPORT;
1673                 code = logfile_format_has_i ? FNONE : FLOG;
1674         } else if (am_daemon) {
1675                 itemizing = logfile_format_has_i && do_xfers;
1676                 maybe_ATTRS_REPORT = ATTRS_REPORT;
1677                 code = itemizing || !do_xfers ? FCLIENT : FINFO;
1678         } else if (!am_server) {
1679                 itemizing = stdout_format_has_i;
1680                 maybe_ATTRS_REPORT = stdout_format_has_i ? 0 : ATTRS_REPORT;
1681                 code = itemizing ? FNONE : FINFO;
1682         } else {
1683                 itemizing = 0;
1684                 maybe_ATTRS_REPORT = ATTRS_REPORT;
1685                 code = FINFO;
1686         }
1687         solo_file = local_name != NULL;
1688
1689         if (verbose > 2) {
1690                 rprintf(FINFO, "generator starting pid=%ld count=%d\n",
1691                         (long)getpid(), flist->count);
1692         }
1693
1694         if (delete_before && !local_name && flist->count > 0)
1695                 do_delete_pass(flist);
1696         if (delete_during == 2) {
1697                 deldelay_size = BIGPATHBUFLEN * 4;
1698                 deldelay_buf = new_array(char, deldelay_size);
1699                 if (!deldelay_buf)
1700                         out_of_memory("delete-delay");
1701         }
1702         do_progress = 0;
1703
1704         if (append_mode || whole_file < 0)
1705                 whole_file = 0;
1706         if (verbose >= 2) {
1707                 rprintf(FINFO, "delta-transmission %s\n",
1708                         whole_file
1709                         ? "disabled for local transfer or --whole-file"
1710                         : "enabled");
1711         }
1712
1713         /* Since we often fill up the outgoing socket and then just sit around
1714          * waiting for the other 2 processes to do their thing, we don't want
1715          * to exit on a timeout.  If the data stops flowing, the receiver will
1716          * notice that and let us know via the redo pipe (or its closing). */
1717         ignore_timeout = 1;
1718
1719         for (i = 0; i < flist->count; i++) {
1720                 struct file_struct *file = flist->files[i];
1721
1722                 if (!F_IS_ACTIVE(file))
1723                         continue;
1724
1725                 if (local_name)
1726                         strlcpy(fbuf, local_name, sizeof fbuf);
1727                 else
1728                         f_name(file, fbuf);
1729                 recv_generator(fbuf, file, i, itemizing, maybe_ATTRS_REPORT,
1730                                code, f_out);
1731
1732                 /* We need to ensure that any dirs we create have writeable
1733                  * permissions during the time we are putting files within
1734                  * them.  This is then fixed after the transfer is done. */
1735 #ifdef HAVE_CHMOD
1736                 if (!am_root && S_ISDIR(file->mode) && !(file->mode & S_IWUSR)
1737                  && dir_tweaking) {
1738                         mode_t mode = file->mode | S_IWUSR; /* user write */
1739                         char *fname = local_name ? local_name : fbuf;
1740                         if (do_chmod(fname, mode) < 0) {
1741                                 rsyserr(FERROR, errno,
1742                                         "failed to modify permissions on %s",
1743                                         full_fname(fname));
1744                         }
1745                         need_retouch_dir_perms = 1;
1746                 }
1747 #endif
1748
1749 #ifdef SUPPORT_HARD_LINKS
1750                 if (preserve_hard_links)
1751                         check_for_finished_hlinks(itemizing, code);
1752 #endif
1753
1754                 if (allowed_lull && !(i % lull_mod))
1755                         maybe_send_keepalive();
1756                 else if (!(i % 200))
1757                         maybe_flush_socket();
1758         }
1759         recv_generator(NULL, NULL, 0, 0, 0, code, -1);
1760         if (delete_during)
1761                 delete_in_dir(NULL, NULL, NULL, NULL);
1762
1763         phase++;
1764         csum_length = SUM_LENGTH;
1765         max_size = min_size = ignore_existing = ignore_non_existing = 0;
1766         update_only = always_checksum = size_only = 0;
1767         ignore_times = 1;
1768         if (append_mode)  /* resend w/o append mode */
1769                 append_mode = -1; /* ... but only longer files */
1770         make_backups = 0; /* avoid a duplicate backup for inplace processing */
1771
1772         if (verbose > 2)
1773                 rprintf(FINFO, "generate_files phase=%d\n", phase);
1774
1775         write_int(f_out, NDX_DONE);
1776
1777         /* files can cycle through the system more than once
1778          * to catch initial checksum errors */
1779         while ((i = get_redo_num(itemizing, code)) != -1) {
1780                 struct file_struct *file = flist->files[i];
1781                 if (local_name)
1782                         strlcpy(fbuf, local_name, sizeof fbuf);
1783                 else
1784                         f_name(file, fbuf);
1785                 recv_generator(fbuf, file, i, itemizing, maybe_ATTRS_REPORT,
1786                                code, f_out);
1787         }
1788
1789         phase++;
1790         ignore_non_existing = save_ignore_non_existing;
1791         ignore_existing = save_ignore_existing;
1792         make_backups = save_make_backups;
1793
1794         if (verbose > 2)
1795                 rprintf(FINFO, "generate_files phase=%d\n", phase);
1796
1797         write_int(f_out, NDX_DONE);
1798         /* Reduce round-trip lag-time for a useless delay-updates phase. */
1799         if (protocol_version >= 29 && !delay_updates)
1800                 write_int(f_out, NDX_DONE);
1801
1802         /* Read MSG_DONE for the redo phase (and any prior messages). */
1803         get_redo_num(itemizing, code);
1804
1805         if (protocol_version >= 29) {
1806                 phase++;
1807                 if (verbose > 2)
1808                         rprintf(FINFO, "generate_files phase=%d\n", phase);
1809                 if (delay_updates)
1810                         write_int(f_out, NDX_DONE);
1811                 /* Read MSG_DONE for delay-updates phase & prior messages. */
1812                 get_redo_num(itemizing, code);
1813         }
1814
1815         do_progress = save_do_progress;
1816         if (delete_during == 2)
1817                 do_delayed_deletions(fbuf);
1818         if (delete_after && !local_name && flist->count > 0)
1819                 do_delete_pass(flist);
1820
1821         if ((need_retouch_dir_perms || need_retouch_dir_times) && dir_tweaking) {
1822                 int j = 0;
1823                 /* Now we need to fix any directory permissions that were
1824                  * modified during the transfer and/or re-set any tweaked
1825                  * modified-time values. */
1826                 for (i = 0; i < flist->count; i++) {
1827                         struct file_struct *file = flist->files[i];
1828                         if (!F_IS_ACTIVE(file) || !S_ISDIR(file->mode))
1829                                 continue;
1830                         if (!need_retouch_dir_times && file->mode & S_IWUSR)
1831                                 continue;
1832                         if (file->flags & FLAG_MISSING_DIR) {
1833                                 int missing = file->dir.depth;
1834                                 while (++i < flist->count) {
1835                                         file = flist->files[i];
1836                                         if (file->dir.depth <= missing)
1837                                                 break;
1838                                 }
1839                                 i--;
1840                                 continue;
1841                         }
1842                         recv_generator(f_name(file, NULL), file, i, itemizing,
1843                                        maybe_ATTRS_REPORT, code, -1);
1844                         if (allowed_lull && !(++j % lull_mod))
1845                                 maybe_send_keepalive();
1846                         else if (!(j % 200))
1847                                 maybe_flush_socket();
1848                 }
1849         }
1850         recv_generator(NULL, NULL, 0, 0, 0, code, -1);
1851
1852         if (max_delete >= 0 && deletion_count > max_delete) {
1853                 rprintf(FINFO,
1854                         "Deletions stopped due to --max-delete limit (%d skipped)\n",
1855                         deletion_count - max_delete);
1856                 io_error |= IOERR_DEL_LIMIT;
1857         }
1858
1859         if (verbose > 2)
1860                 rprintf(FINFO, "generate_files finished\n");
1861 }