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 int maybe_ATTRS_REPORT = 0;
  99
 100 static int deletion_count = 0; /* used to implement --max-delete */
 101 static int deldelay_size = 0, deldelay_cnt = 0;
 102 static char *deldelay_buf = NULL;
 103 static int deldelay_fd = -1;
 104 static BOOL solo_file = 0;
 105
 106 /* For calling delete_item() and delete_dir_contents(). */
 107 #define DEL_RECURSE             (1<<1) /* recurse */
 108 #define DEL_DIR_IS_EMPTY        (1<<2) /* internal delete_FUNCTIONS use only */
 109
 110 enum nonregtype {
 111     TYPE_DIR, TYPE_SPECIAL, TYPE_DEVICE, TYPE_SYMLINK
 112 };
 113
 114 enum delret {
 115     DR_SUCCESS = 0, DR_FAILURE, DR_AT_LIMIT, DR_NOT_EMPTY
 116 };
 117
 118 /* Forward declaration for delete_item(). */
 119 static enum delret delete_dir_contents(char *fname, int flags);
 120
 121
 122 static int is_backup_file(char *fn)
 123 {
 124         int k = strlen(fn) - backup_suffix_len;
 125         return k > 0 && strcmp(fn+k, backup_suffix) == 0;
 126 }
 127
 128 /* Delete a file or directory.  If DEL_RECURSE is set in the flags, this will
 129  * delete recursively.
 130  *
 131  * Note that fbuf must point to a MAXPATHLEN buffer if the mode indicates it's
 132  * a directory! (The buffer is used for recursion, but returned unchanged.)
 133  */
 134 static enum delret delete_item(char *fbuf, int mode, char *replace, int flags)
 135 {
 136         enum delret ret;
 137         char *what;
 138         int ok;
 139
 140         if (verbose > 2) {
 141                 rprintf(FINFO, "delete_item(%s) mode=%o flags=%d\n",
 142                         fbuf, mode, flags);
 143         }
 144
 145         if (S_ISDIR(mode) && !(flags & DEL_DIR_IS_EMPTY)) {
 146                 ignore_perishable = 1;
 147                 /* If DEL_RECURSE is not set, this just reports emptiness. */
 148                 ret = delete_dir_contents(fbuf, flags);
 149                 ignore_perishable = 0;
 150                 if (ret == DR_NOT_EMPTY || ret == DR_AT_LIMIT)
 151                         goto check_ret;
 152                 /* OK: try to delete the directory. */
 153         }
 154
 155         if (!replace && max_delete >= 0 && ++deletion_count > max_delete)
 156                 return DR_AT_LIMIT;
 157
 158         if (S_ISDIR(mode)) {
 159                 what = "rmdir";
 160                 ok = do_rmdir(fbuf) == 0;
 161         } else if (make_backups && (backup_dir || !is_backup_file(fbuf))) {
 162                 what = "make_backup";
 163                 ok = make_backup(fbuf);
 164         } else {
 165                 what = "unlink";
 166                 ok = robust_unlink(fbuf) == 0;
 167         }
 168
 169         if (ok) {
 170                 if (!replace)
 171                         log_delete(fbuf, mode);
 172                 ret = DR_SUCCESS;
 173         } else {
 174                 if (S_ISDIR(mode) && errno == ENOTEMPTY) {
 175                         rprintf(FINFO, "cannot delete non-empty directory: %s\n",
 176                                 fbuf);
 177                         ret = DR_NOT_EMPTY;
 178                 } else if (errno != ENOENT) {
 179                         rsyserr(FERROR, errno, "delete_file: %s(%s) failed",
 180                                 what, fbuf);
 181                         ret = DR_FAILURE;
 182                 } else {
 183                         deletion_count--;
 184                         ret = DR_SUCCESS;
 185                 }
 186         }
 187
 188   check_ret:
 189         if (replace && ret != DR_SUCCESS) {
 190                 rprintf(FERROR, "could not make way for new %s: %s\n",
 191                         replace, fbuf);
 192         }
 193         return ret;
 194 }
 195
 196 /* The directory is about to be deleted: if DEL_RECURSE is given, delete all
 197  * its contents, otherwise just checks for content.  Returns DR_SUCCESS or
 198  * DR_NOT_EMPTY.  Note that fname must point to a MAXPATHLEN buffer!  (The
 199  * buffer is used for recursion, but returned unchanged.)
 200  */
 201 static enum delret delete_dir_contents(char *fname, int flags)
 202 {
 203         struct file_list *dirlist;
 204         enum delret ret;
 205         unsigned remainder;
 206         void *save_filters;
 207         int j, dlen;
 208         char *p;
 209
 210         if (verbose > 3) {
 211                 rprintf(FINFO, "delete_dir_contents(%s) flags=%d\n",
 212                         fname, flags);
 213         }
 214
 215         dlen = strlen(fname);
 216         save_filters = push_local_filters(fname, dlen);
 217
 218         non_perishable_cnt = 0;
 219         dirlist = get_dirlist(fname, dlen, 0);
 220         ret = non_perishable_cnt ? DR_NOT_EMPTY : DR_SUCCESS;
 221
 222         if (!dirlist->count)
 223                 goto done;
 224
 225         if (!(flags & DEL_RECURSE)) {
 226                 ret = DR_NOT_EMPTY;
 227                 goto done;
 228         }
 229
 230         p = fname + dlen;
 231         if (dlen != 1 || *fname != '/')
 232                 *p++ = '/';
 233         remainder = MAXPATHLEN - (p - fname);
 234
 235         /* We do our own recursion, so make delete_item() non-recursive. */
 236         flags = (flags & ~DEL_RECURSE) | DEL_DIR_IS_EMPTY;
 237
 238         for (j = dirlist->count; j--; ) {
 239                 struct file_struct *fp = dirlist->files[j];
 240
 241                 if (fp->flags & FLAG_MOUNT_DIR) {
 242                         if (verbose > 1) {
 243                                 rprintf(FINFO,
 244                                     "mount point, %s, pins parent directory\n",
 245                                     f_name(fp, NULL));
 246                         }
 247                         ret = DR_NOT_EMPTY;
 248                         continue;
 249                 }
 250
 251                 strlcpy(p, fp->basename, remainder);
 252                 /* Save stack by recursing to ourself directly. */
 253                 if (S_ISDIR(fp->mode)
 254                  && delete_dir_contents(fname, flags | DEL_RECURSE) != DR_SUCCESS)
 255                         ret = DR_NOT_EMPTY;
 256                 if (delete_item(fname, fp->mode, NULL, flags) != DR_SUCCESS)
 257                         ret = DR_NOT_EMPTY;
 258         }
 259
 260         fname[dlen] = '\0';
 261
 262   done:
 263         flist_free(dirlist);
 264         pop_local_filters(save_filters);
 265
 266         if (ret == DR_NOT_EMPTY) {
 267                 rprintf(FINFO, "cannot delete non-empty directory: %s\n",
 268                         fname);
 269         }
 270         return ret;
 271 }
 272
 273 static int start_delete_delay_temp(void)
 274 {
 275         char fnametmp[MAXPATHLEN];
 276         int save_dry_run = dry_run;
 277
 278         dry_run = 0;
 279         if (!get_tmpname(fnametmp, "deldelay")
 280          || (deldelay_fd = do_mkstemp(fnametmp, 0600)) < 0) {
 281                 rprintf(FINFO, "NOTE: Unable to create delete-delay temp file--"
 282                         "switching to --delete-after.\n");
 283                 delete_during = 0;
 284                 delete_after = 1;
 285                 dry_run = save_dry_run;
 286                 return 0;
 287         }
 288         unlink(fnametmp);
 289         dry_run = save_dry_run;
 290         return 1;
 291 }
 292
 293 static int flush_delete_delay(void)
 294 {
 295         if (write(deldelay_fd, deldelay_buf, deldelay_cnt) != deldelay_cnt) {
 296                 rsyserr(FERROR, errno, "flush of delete-delay buffer");
 297                 delete_during = 0;
 298                 delete_after = 1;
 299                 close(deldelay_fd);
 300                 return 0;
 301         }
 302         deldelay_cnt = 0;
 303         return 1;
 304 }
 305
 306 static int remember_delete(struct file_struct *file, const char *fname)
 307 {
 308         int len;
 309
 310         while (1) {
 311                 len = snprintf(deldelay_buf + deldelay_cnt,
 312                                deldelay_size - deldelay_cnt,
 313                                "%x %s%c", (int)file->mode, fname, '\0');
 314                 if ((deldelay_cnt += len) <= deldelay_size)
 315                         break;
 316                 if (deldelay_fd < 0 && !start_delete_delay_temp())
 317                         return 0;
 318                 deldelay_cnt -= len;
 319                 if (!flush_delete_delay())
 320                         return 0;
 321         }
 322
 323         return 1;
 324 }
 325
 326 static int read_delay_line(char *buf)
 327 {
 328         static int read_pos = 0;
 329         int j, len, mode;
 330         char *bp, *past_space;
 331
 332         while (1) {
 333                 for (j = read_pos; j < deldelay_cnt && deldelay_buf[j]; j++) {}
 334                 if (j < deldelay_cnt)
 335                         break;
 336                 if (deldelay_fd < 0) {
 337                         if (j > read_pos)
 338                                 goto invalid_data;
 339                         return -1;
 340                 }
 341                 deldelay_cnt -= read_pos;
 342                 if (deldelay_cnt == deldelay_size)
 343                         goto invalid_data;
 344                 if (deldelay_cnt && read_pos) {
 345                         memmove(deldelay_buf, deldelay_buf + read_pos,
 346                                 deldelay_cnt);
 347                 }
 348                 len = read(deldelay_fd, deldelay_buf + deldelay_cnt,
 349                            deldelay_size - deldelay_cnt);
 350                 if (len == 0) {
 351                         if (deldelay_cnt) {
 352                                 rprintf(FERROR,
 353                                     "ERROR: unexpected EOF in delete-delay file.\n");
 354                         }
 355                         return -1;
 356                 }
 357                 if (len < 0) {
 358                         rsyserr(FERROR, errno,
 359                                 "reading delete-delay file");
 360                         return -1;
 361                 }
 362                 deldelay_cnt += len;
 363                 read_pos = 0;
 364         }
 365
 366         bp = deldelay_buf + read_pos;
 367
 368         if (sscanf(bp, "%x ", &mode) != 1) {
 369           invalid_data:
 370                 rprintf(FERROR, "ERROR: invalid data in delete-delay file.\n");
 371                 return -1;
 372         }
 373         past_space = strchr(bp, ' ') + 1;
 374         len = j - read_pos - (past_space - bp) + 1; /* count the '\0' */
 375         read_pos = j + 1;
 376
 377         if (len > MAXPATHLEN) {
 378                 rprintf(FERROR, "ERROR: filename too long in delete-delay file.\n");
 379                 return -1;
 380         }
 381
 382         /* The caller needs the name in a MAXPATHLEN buffer, so we copy it
 383          * instead of returning a pointer to our buffer. */
 384         memcpy(buf, past_space, len);
 385
 386         return mode;
 387 }
 388
 389 static void do_delayed_deletions(char *delbuf)
 390 {
 391         int mode;
 392
 393         if (deldelay_fd >= 0) {
 394                 if (deldelay_cnt && !flush_delete_delay())
 395                         return;
 396                 lseek(deldelay_fd, 0, 0);
 397         }
 398         while ((mode = read_delay_line(delbuf)) >= 0)
 399                 delete_item(delbuf, mode, NULL, DEL_RECURSE);
 400         if (deldelay_fd >= 0)
 401                 close(deldelay_fd);
 402 }
 403
 404 /* This function is used to implement per-directory deletion, and is used by
 405  * all the --delete-WHEN options.  Note that the fbuf pointer must point to a
 406  * MAXPATHLEN buffer with the name of the directory in it (the functions we
 407  * call will append names onto the end, but the old dir value will be restored
 408  * on exit). */
 409 static void delete_in_dir(struct file_list *flist, char *fbuf,
 410                           struct file_struct *file, STRUCT_STAT *stp)
 411 {
 412         static int min_depth = MAXPATHLEN, cur_depth = -1;
 413         static void *filt_array[MAXPATHLEN/2+1];
 414         static int already_warned = 0;
 415         struct file_list *dirlist;
 416         char delbuf[MAXPATHLEN];
 417         int dlen, i;
 418
 419         if (!flist) {
 420                 while (cur_depth >= min_depth)
 421                         pop_local_filters(filt_array[cur_depth--]);
 422                 min_depth = MAXPATHLEN;
 423                 cur_depth = -1;
 424                 return;
 425         }
 426
 427         if (verbose > 2)
 428                 rprintf(FINFO, "delete_in_dir(%s)\n", fbuf);
 429
 430         if (allowed_lull)
 431                 maybe_send_keepalive();
 432
 433         if (F_DEPTH(file) >= MAXPATHLEN/2+1)
 434                 return; /* Impossible... */
 435
 436         if (io_error && !ignore_errors) {
 437                 if (already_warned)
 438                         return;
 439                 rprintf(FINFO,
 440                         "IO error encountered -- skipping file deletion\n");
 441                 already_warned = 1;
 442                 return;
 443         }
 444
 445         while (cur_depth >= F_DEPTH(file) && cur_depth >= min_depth)
 446                 pop_local_filters(filt_array[cur_depth--]);
 447         cur_depth = F_DEPTH(file);
 448         if (min_depth > cur_depth)
 449                 min_depth = cur_depth;
 450         dlen = strlen(fbuf);
 451         filt_array[cur_depth] = push_local_filters(fbuf, dlen);
 452
 453         if (one_file_system) {
 454                 if (file->flags & FLAG_TOP_DIR)
 455                         filesystem_dev = stp->st_dev;
 456                 else if (filesystem_dev != stp->st_dev)
 457                         return;
 458         }
 459
 460         dirlist = get_dirlist(fbuf, dlen, 0);
 461
 462         /* If an item in dirlist is not found in flist, delete it
 463          * from the filesystem. */
 464         for (i = dirlist->count; i--; ) {
 465                 struct file_struct *fp = dirlist->files[i];
 466                 if (!F_IS_ACTIVE(fp))
 467                         continue;
 468                 if (fp->flags & FLAG_MOUNT_DIR) {
 469                         if (verbose > 1)
 470                                 rprintf(FINFO, "cannot delete mount point: %s\n",
 471                                         f_name(fp, NULL));
 472                         continue;
 473                 }
 474                 if (flist_find(flist, fp) < 0) {
 475                         f_name(fp, delbuf);
 476                         if (delete_during == 2) {
 477                                 if (!remember_delete(fp, delbuf))
 478                                         break;
 479                         } else
 480                                 delete_item(delbuf, fp->mode, NULL, DEL_RECURSE);
 481                 }
 482         }
 483
 484         flist_free(dirlist);
 485 }
 486
 487 /* This deletes any files on the receiving side that are not present on the
 488  * sending side.  This is used by --delete-before and --delete-after. */
 489 static void do_delete_pass(struct file_list *flist)
 490 {
 491         char fbuf[MAXPATHLEN];
 492         STRUCT_STAT st;
 493         int j;
 494
 495         /* dry_run is incremented when the destination doesn't exist yet. */
 496         if (dry_run > 1 || list_only)
 497                 return;
 498
 499         for (j = 0; j < flist->count; j++) {
 500                 struct file_struct *file = flist->files[j];
 501
 502                 if (!(file->flags & FLAG_XFER_DIR))
 503                         continue;
 504
 505                 f_name(file, fbuf);
 506                 if (verbose > 1 && file->flags & FLAG_TOP_DIR)
 507                         rprintf(FINFO, "deleting in %s\n", fbuf);
 508
 509                 if (link_stat(fbuf, &st, keep_dirlinks) < 0
 510                  || !S_ISDIR(st.st_mode))
 511                         continue;
 512
 513                 delete_in_dir(flist, fbuf, file, &st);
 514         }
 515         delete_in_dir(NULL, NULL, NULL, NULL);
 516
 517         if (do_progress && !am_server)
 518                 rprintf(FINFO, "                    \r");
 519 }
 520
 521 int unchanged_attrs(struct file_struct *file, STRUCT_STAT *st)
 522 {
 523         if (preserve_perms && !BITS_EQUAL(st->st_mode, 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 (!BITS_EQUAL(st->st_mode, file->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 = file->basename;
 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 = fp->basename;
 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         char fbuf[MAXPATHLEN];
 792         int ndx;
 793
 794         while ((ndx = get_hlink_num()) != -1) {
 795                 if (ndx < 0 || ndx >= the_file_list->count)
 796                         continue;
 797
 798                 file = the_file_list->files[ndx];
 799                 if (!F_IS_HLINKED(file))
 800                         continue;
 801
 802                 finish_hard_link(file, f_name(file, fbuf), NULL, itemizing, code, -1);
 803         }
 804 }
 805 #endif
 806
 807 /* This is only called for regular files.  We return -2 if we've finished
 808  * handling the file, -1 if no dest-linking occurred, or a non-negative
 809  * value if we found an alternate basis file. */
 810 static int try_dests_reg(struct file_struct *file, char *fname, int ndx,
 811                          char *cmpbuf, STRUCT_STAT *stp, int itemizing,
 812                          enum logcode code)
 813 {
 814         int best_match = -1;
 815         int match_level = 0;
 816         int j = 0;
 817
 818         do {
 819                 pathjoin(cmpbuf, MAXPATHLEN, basis_dir[j], fname);
 820                 if (link_stat(cmpbuf, stp, 0) < 0 || !S_ISREG(stp->st_mode))
 821                         continue;
 822                 switch (match_level) {
 823                 case 0:
 824                         best_match = j;
 825                         match_level = 1;
 826                         /* FALL THROUGH */
 827                 case 1:
 828                         if (!unchanged_file(cmpbuf, file, stp))
 829                                 continue;
 830                         best_match = j;
 831                         match_level = 2;
 832                         /* FALL THROUGH */
 833                 case 2:
 834                         if (!unchanged_attrs(file, stp))
 835                                 continue;
 836                         if (always_checksum && preserve_times
 837                          && cmp_time(stp->st_mtime, file->modtime))
 838                                 continue;
 839                         best_match = j;
 840                         match_level = 3;
 841                         break;
 842                 }
 843                 break;
 844         } while (basis_dir[++j] != NULL);
 845
 846         if (!match_level)
 847                 return -1;
 848
 849         if (j != best_match) {
 850                 j = best_match;
 851                 pathjoin(cmpbuf, MAXPATHLEN, basis_dir[j], fname);
 852                 if (link_stat(cmpbuf, stp, 0) < 0)
 853                         return -1;
 854         }
 855
 856         if (match_level == 3 && !copy_dest) {
 857 #ifdef SUPPORT_HARD_LINKS
 858                 if (link_dest) {
 859                         if (!hard_link_one(file, fname, cmpbuf, 1))
 860                                 goto try_a_copy;
 861                         if (preserve_hard_links && F_IS_HLINKED(file))
 862                                 finish_hard_link(file, fname, stp, itemizing, code, j);
 863                         if (itemizing && (verbose > 1 || stdout_format_has_i > 1)) {
 864                                 itemize(file, ndx, 1, stp,
 865                                         ITEM_LOCAL_CHANGE | ITEM_XNAME_FOLLOWS,
 866                                         0, "");
 867                         }
 868                 } else
 869 #endif
 870                 if (itemizing)
 871                         itemize(file, ndx, 0, stp, 0, 0, NULL);
 872                 if (verbose > 1 && maybe_ATTRS_REPORT)
 873                         rprintf(FCLIENT, "%s is uptodate\n", fname);
 874                 return -2;
 875         }
 876
 877         if (match_level >= 2) {
 878 #ifdef SUPPORT_HARD_LINKS
 879           try_a_copy: /* Copy the file locally. */
 880 #endif
 881                 if (copy_file(cmpbuf, fname, file->mode) < 0) {
 882                         if (verbose) {
 883                                 rsyserr(FINFO, errno, "copy_file %s => %s",
 884                                         full_fname(cmpbuf), fname);
 885                         }
 886                         return -1;
 887                 }
 888                 if (itemizing)
 889                         itemize(file, ndx, 0, stp, ITEM_LOCAL_CHANGE, 0, NULL);
 890                 set_file_attrs(fname, file, NULL, 0);
 891                 if (maybe_ATTRS_REPORT
 892                  && ((!itemizing && verbose && match_level == 2)
 893                   || (verbose > 1 && match_level == 3))) {
 894                         code = match_level == 3 ? FCLIENT : FINFO;
 895                         rprintf(code, "%s%s\n", fname,
 896                                 match_level == 3 ? " is uptodate" : "");
 897                 }
 898 #ifdef SUPPORT_HARD_LINKS
 899                 if (preserve_hard_links && F_IS_HLINKED(file))
 900                         finish_hard_link(file, fname, stp, itemizing, code, -1);
 901 #endif
 902                 return -2;
 903         }
 904
 905         return FNAMECMP_BASIS_DIR_LOW + j;
 906 }
 907
 908 /* This is only called for non-regular files.  We return -2 if we've finished
 909  * handling the file, or -1 if no dest-linking occurred, or a non-negative
 910  * value if we found an alternate basis file. */
 911 static int try_dests_non(struct file_struct *file, char *fname, int ndx,
 912                          char *cmpbuf, STRUCT_STAT *stp, int itemizing,
 913                          enum logcode code)
 914 {
 915         char lnk[MAXPATHLEN];
 916         int best_match = -1;
 917         int match_level = 0;
 918         enum nonregtype type;
 919         uint32 *devp;
 920         int len, j = 0;
 921
 922 #ifndef SUPPORT_LINKS
 923         if (S_ISLNK(file->mode))
 924                 return -1;
 925 #endif
 926         if (S_ISDIR(file->mode)) {
 927                 type = TYPE_DIR;
 928         } else if (IS_SPECIAL(file->mode))
 929                 type = TYPE_SPECIAL;
 930         else if (IS_DEVICE(file->mode))
 931                 type = TYPE_DEVICE;
 932 #ifdef SUPPORT_LINKS
 933         else if (S_ISLNK(file->mode))
 934                 type = TYPE_SYMLINK;
 935 #endif
 936         else {
 937                 rprintf(FERROR,
 938                         "internal: try_dests_non() called with invalid mode (%o)\n",
 939                         (int)file->mode);
 940                 exit_cleanup(RERR_UNSUPPORTED);
 941         }
 942
 943         do {
 944                 pathjoin(cmpbuf, MAXPATHLEN, basis_dir[j], fname);
 945                 if (link_stat(cmpbuf, stp, 0) < 0)
 946                         continue;
 947                 switch (type) {
 948                 case TYPE_DIR:
 949                         if (!S_ISDIR(stp->st_mode))
 950                                 continue;
 951                         break;
 952                 case TYPE_SPECIAL:
 953                         if (!IS_SPECIAL(stp->st_mode))
 954                                 continue;
 955                         break;
 956                 case TYPE_DEVICE:
 957                         if (!IS_DEVICE(stp->st_mode))
 958                                 continue;
 959                         break;
 960 #ifdef SUPPORT_LINKS
 961                 case TYPE_SYMLINK:
 962                         if (!S_ISLNK(stp->st_mode))
 963                                 continue;
 964                         break;
 965 #endif
 966                 }
 967                 if (match_level < 1) {
 968                         match_level = 1;
 969                         best_match = j;
 970                 }
 971                 switch (type) {
 972                 case TYPE_DIR:
 973                         break;
 974                 case TYPE_SPECIAL:
 975                 case TYPE_DEVICE:
 976                         devp = F_RDEV_P(file);
 977                         if (stp->st_rdev != MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp)))
 978                                 continue;
 979                         break;
 980 #ifdef SUPPORT_LINKS
 981                 case TYPE_SYMLINK:
 982                         if ((len = readlink(cmpbuf, lnk, MAXPATHLEN-1)) <= 0)
 983                                 continue;
 984                         lnk[len] = '\0';
 985                         if (strcmp(lnk, F_SYMLINK(file)) != 0)
 986                                 continue;
 987                         break;
 988 #endif
 989                 }
 990                 if (match_level < 2) {
 991                         match_level = 2;
 992                         best_match = j;
 993                 }
 994                 if (unchanged_attrs(file, stp)) {
 995                         match_level = 3;
 996                         best_match = j;
 997                         break;
 998                 }
 999         } while (basis_dir[++j] != NULL);
1000
1001         if (!match_level)
1002                 return -1;
1003
1004         if (j != best_match) {
1005                 j = best_match;
1006                 pathjoin(cmpbuf, MAXPATHLEN, basis_dir[j], fname);
1007                 if (link_stat(cmpbuf, stp, 0) < 0)
1008                         return -1;
1009         }
1010
1011         if (match_level == 3) {
1012 #ifdef SUPPORT_HARD_LINKS
1013                 if (link_dest
1014 #ifndef CAN_HARDLINK_SYMLINK
1015                  && !S_ISLNK(file->mode)
1016 #endif
1017 #ifndef CAN_HARDLINK_SPECIAL
1018                  && !IS_SPECIAL(file->mode) && !IS_DEVICE(file->mode)
1019 #endif
1020                  && !S_ISDIR(file->mode)) {
1021                         if (do_link(cmpbuf, fname) < 0) {
1022                                 rsyserr(FERROR, errno,
1023                                         "failed to hard-link %s with %s",
1024                                         cmpbuf, fname);
1025                                 return j;
1026                         }
1027                         if (preserve_hard_links && F_IS_HLINKED(file))
1028                                 finish_hard_link(file, fname, NULL, itemizing, code, -1);
1029                 } else
1030 #endif
1031                         match_level = 2;
1032                 if (itemizing && stdout_format_has_i
1033                  && (verbose > 1 || stdout_format_has_i > 1)) {
1034                         int chg = compare_dest && type != TYPE_DIR ? 0
1035                             : ITEM_LOCAL_CHANGE
1036                              + (match_level == 3 ? ITEM_XNAME_FOLLOWS : 0);
1037                         char *lp = match_level == 3 ? "" : NULL;
1038                         itemize(file, ndx, 0, stp, chg + ITEM_MATCHED, 0, lp);
1039                 }
1040                 if (verbose > 1 && maybe_ATTRS_REPORT) {
1041                         rprintf(FCLIENT, "%s%s is uptodate\n",
1042                                 fname, type == TYPE_DIR ? "/" : "");
1043                 }
1044                 return -2;
1045         }
1046
1047         return j;
1048 }
1049
1050 static int phase = 0;
1051
1052 /* Acts on the_file_list->file's ndx'th item, whose name is fname.  If a dir,
1053  * make sure it exists, and has the right permissions/timestamp info.  For
1054  * all other non-regular files (symlinks, etc.) we create them here.  For
1055  * regular files that have changed, we try to find a basis file and then
1056  * start sending checksums.
1057  *
1058  * When fname is non-null, it must point to a MAXPATHLEN buffer!
1059  *
1060  * Note that f_out is set to -1 when doing final directory-permission and
1061  * modification-time repair. */
1062 static void recv_generator(char *fname, struct file_struct *file, int ndx,
1063                            int itemizing, enum logcode code, int f_out)
1064 {
1065         static int missing_below = -1, excluded_below = -1;
1066         static const char *parent_dirname = "";
1067         static struct file_list *fuzzy_dirlist = NULL;
1068         static int need_fuzzy_dirlist = 0;
1069         struct file_struct *fuzzy_file = NULL;
1070         int fd = -1, f_copy = -1;
1071         STRUCT_STAT st, real_st, partial_st;
1072         struct file_struct *back_file = NULL;
1073         int statret, real_ret, stat_errno;
1074         char *fnamecmp, *partialptr, *backupptr = NULL;
1075         char fnamecmpbuf[MAXPATHLEN];
1076         uchar fnamecmp_type;
1077         int del_opts = delete_mode || force_delete ? DEL_RECURSE : 0;
1078
1079         if (list_only)
1080                 return;
1081
1082         if (!fname) {
1083                 if (fuzzy_dirlist) {
1084                         flist_free(fuzzy_dirlist);
1085                         fuzzy_dirlist = NULL;
1086                 }
1087                 if (missing_below >= 0) {
1088                         if (dry_run)
1089                                 dry_run--;
1090                         missing_below = -1;
1091                 }
1092                 parent_dirname = "";
1093                 return;
1094         }
1095
1096         if (verbose > 2)
1097                 rprintf(FINFO, "recv_generator(%s,%d)\n", fname, ndx);
1098
1099         if (server_filter_list.head) {
1100                 if (excluded_below >= 0) {
1101                         if (F_DEPTH(file) > excluded_below)
1102                                 goto skipping;
1103                         excluded_below = -1;
1104                 }
1105                 if (check_filter(&server_filter_list, fname,
1106                                  S_ISDIR(file->mode)) < 0) {
1107                         if (S_ISDIR(file->mode))
1108                                 excluded_below = F_DEPTH(file);
1109                   skipping:
1110                         if (verbose) {
1111                                 rprintf(FINFO,
1112                                         "skipping server-excluded file \"%s\"\n",
1113                                         fname);
1114                         }
1115                         return;
1116                 }
1117         }
1118
1119         if (missing_below >= 0) {
1120                 if (F_DEPTH(file) <= missing_below) {
1121                         if (dry_run)
1122                                 dry_run--;
1123                         missing_below = -1;
1124                 } else if (!dry_run)
1125                         return;
1126         }
1127         if (dry_run > 1) {
1128                 statret = -1;
1129                 stat_errno = ENOENT;
1130         } else {
1131                 const char *dn = file->dirname ? file->dirname : ".";
1132                 if (parent_dirname != dn && strcmp(parent_dirname, dn) != 0) {
1133                         if (relative_paths && !implied_dirs
1134                          && do_stat(dn, &st) < 0
1135                          && create_directory_path(fname) < 0) {
1136                                 rsyserr(FERROR, errno,
1137                                         "recv_generator: mkdir %s failed",
1138                                         full_fname(dn));
1139                         }
1140                         if (fuzzy_dirlist) {
1141                                 flist_free(fuzzy_dirlist);
1142                                 fuzzy_dirlist = NULL;
1143                         }
1144                         if (fuzzy_basis)
1145                                 need_fuzzy_dirlist = 1;
1146                 }
1147                 parent_dirname = dn;
1148
1149                 if (need_fuzzy_dirlist && S_ISREG(file->mode)) {
1150                         strlcpy(fnamecmpbuf, dn, sizeof fnamecmpbuf);
1151                         fuzzy_dirlist = get_dirlist(fnamecmpbuf, -1, 1);
1152                         need_fuzzy_dirlist = 0;
1153                 }
1154
1155                 statret = link_stat(fname, &st,
1156                                     keep_dirlinks && S_ISDIR(file->mode));
1157                 stat_errno = errno;
1158         }
1159
1160         if (ignore_non_existing && statret == -1 && stat_errno == ENOENT) {
1161                 if (verbose > 1) {
1162                         rprintf(FINFO, "not creating new %s \"%s\"\n",
1163                                 S_ISDIR(file->mode) ? "directory" : "file",
1164                                 fname);
1165                 }
1166                 return;
1167         }
1168
1169         /* If we're not preserving permissions, change the file-list's
1170          * mode based on the local permissions and some heuristics. */
1171         if (!preserve_perms) {
1172                 int exists = statret == 0
1173                           && S_ISDIR(st.st_mode) == S_ISDIR(file->mode);
1174                 file->mode = dest_mode(file->mode, st.st_mode, exists);
1175         }
1176
1177         if (S_ISDIR(file->mode)) {
1178                 /* The file to be received is a directory, so we need
1179                  * to prepare appropriately.  If there is already a
1180                  * file of that name and it is *not* a directory, then
1181                  * we need to delete it.  If it doesn't exist, then
1182                  * (perhaps recursively) create it. */
1183                 if (statret == 0 && !S_ISDIR(st.st_mode)) {
1184                         if (delete_item(fname, st.st_mode, "directory", del_opts) != 0)
1185                                 return;
1186                         statret = -1;
1187                 }
1188                 if (dry_run && statret != 0 && missing_below < 0) {
1189                         missing_below = F_DEPTH(file);
1190                         dry_run++;
1191                 }
1192                 real_ret = statret;
1193                 real_st = st;
1194                 if (new_root_dir) {
1195                         if (*fname == '.' && fname[1] == '\0')
1196                                 statret = -1;
1197                         new_root_dir = 0;
1198                 }
1199                 if (statret != 0 && basis_dir[0] != NULL) {
1200                         int j = try_dests_non(file, fname, ndx, fnamecmpbuf, &st,
1201                                               itemizing, code);
1202                         if (j == -2) {
1203                                 itemizing = 0;
1204                                 code = FNONE;
1205                         } else if (j >= 0)
1206                                 statret = 1;
1207                 }
1208                 if (itemizing && f_out != -1) {
1209                         itemize(file, ndx, statret, &st,
1210                                 statret ? ITEM_LOCAL_CHANGE : 0, 0, NULL);
1211                 }
1212                 if (real_ret != 0 && do_mkdir(fname,file->mode) < 0 && errno != EEXIST) {
1213                         if (!relative_paths || errno != ENOENT
1214                             || create_directory_path(fname) < 0
1215                             || (do_mkdir(fname, file->mode) < 0 && errno != EEXIST)) {
1216                                 rsyserr(FERROR, errno,
1217                                         "recv_generator: mkdir %s failed",
1218                                         full_fname(fname));
1219                                 file->flags |= FLAG_MISSING_DIR;
1220                                 if (ndx+1 < the_file_list->count
1221                                  && F_DEPTH(the_file_list->files[ndx+1]) > F_DEPTH(file)) {
1222                                         rprintf(FERROR,
1223                                             "*** Skipping everything below this failed directory ***\n");
1224                                         missing_below = F_DEPTH(file);
1225                                 }
1226                                 return;
1227                         }
1228                 }
1229                 if (set_file_attrs(fname, file, real_ret ? NULL : &real_st, 0)
1230                     && verbose && code != FNONE && f_out != -1)
1231                         rprintf(code, "%s/\n", fname);
1232                 if (real_ret != 0 && one_file_system)
1233                         real_st.st_dev = filesystem_dev;
1234                 if (delete_during && f_out != -1 && !phase && dry_run < 2
1235                     && (file->flags & FLAG_XFER_DIR))
1236                         delete_in_dir(the_file_list, fname, file, &real_st);
1237                 return;
1238         }
1239
1240 #ifdef SUPPORT_HARD_LINKS
1241         if (preserve_hard_links && F_HLINK_NOT_FIRST(file)
1242          && hard_link_check(file, ndx, fname, statret, &st, itemizing, code))
1243                 return;
1244 #endif
1245
1246         if (preserve_links && S_ISLNK(file->mode)) {
1247 #ifdef SUPPORT_LINKS
1248                 const char *sl = F_SYMLINK(file);
1249                 if (safe_symlinks && unsafe_symlink(sl, fname)) {
1250                         if (verbose) {
1251                                 if (solo_file)
1252                                         fname = f_name(file, NULL);
1253                                 rprintf(FINFO,
1254                                         "ignoring unsafe symlink %s -> \"%s\"\n",
1255                                         full_fname(fname), sl);
1256                         }
1257                         return;
1258                 }
1259                 if (statret == 0) {
1260                         char lnk[MAXPATHLEN];
1261                         int len;
1262
1263                         if (!S_ISLNK(st.st_mode))
1264                                 statret = -1;
1265                         else if ((len = readlink(fname, lnk, MAXPATHLEN-1)) > 0
1266                               && strncmp(lnk, sl, len) == 0 && sl[len] == '\0') {
1267                                 /* The link is pointing to the right place. */
1268                                 if (itemizing)
1269                                         itemize(file, ndx, 0, &st, 0, 0, NULL);
1270                                 set_file_attrs(fname, file, &st, maybe_ATTRS_REPORT);
1271 #ifdef SUPPORT_HARD_LINKS
1272                                 if (preserve_hard_links && F_IS_HLINKED(file))
1273                                         finish_hard_link(file, fname, &st, itemizing, code, -1);
1274 #endif
1275                                 if (remove_source_files == 1)
1276                                         goto return_with_success;
1277                                 return;
1278                         }
1279                         /* Not the right symlink (or not a symlink), so
1280                          * delete it. */
1281                         if (delete_item(fname, st.st_mode, "symlink", del_opts) != 0)
1282                                 return;
1283                 } else if (basis_dir[0] != NULL) {
1284                         int j = try_dests_non(file, fname, ndx, fnamecmpbuf, &st,
1285                                               itemizing, code);
1286                         if (j == -2) {
1287 #ifndef CAN_HARDLINK_SYMLINK
1288                                 if (link_dest) {
1289                                         /* Resort to --copy-dest behavior. */
1290                                 } else
1291 #endif
1292                                 if (!copy_dest)
1293                                         return;
1294                                 itemizing = 0;
1295                                 code = FNONE;
1296                         } else if (j >= 0)
1297                                 statret = 1;
1298                 }
1299 #ifdef SUPPORT_HARD_LINKS
1300                 if (preserve_hard_links && F_HLINK_NOT_LAST(file))
1301                         return;
1302 #endif
1303                 if (do_symlink(sl, fname) != 0) {
1304                         rsyserr(FERROR, errno, "symlink %s -> \"%s\" failed",
1305                                 full_fname(fname), sl);
1306                 } else {
1307                         set_file_attrs(fname, file, NULL, 0);
1308                         if (itemizing) {
1309                                 itemize(file, ndx, statret, &st,
1310                                         ITEM_LOCAL_CHANGE, 0, NULL);
1311                         }
1312                         if (code != FNONE && verbose)
1313                                 rprintf(code, "%s -> %s\n", fname, sl);
1314 #ifdef SUPPORT_HARD_LINKS
1315                         if (preserve_hard_links && F_IS_HLINKED(file))
1316                                 finish_hard_link(file, fname, NULL, itemizing, code, -1);
1317 #endif
1318                         /* This does not check remove_source_files == 1
1319                          * because this is one of the items that the old
1320                          * --remove-sent-files option would remove. */
1321                         if (remove_source_files)
1322                                 goto return_with_success;
1323                 }
1324 #endif
1325                 return;
1326         }
1327
1328         if ((am_root && preserve_devices && IS_DEVICE(file->mode))
1329          || (preserve_specials && IS_SPECIAL(file->mode))) {
1330                 uint32 *devp = F_RDEV_P(file);
1331                 dev_t rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp));
1332                 if (statret == 0) {
1333                         char *t;
1334                         if (IS_DEVICE(file->mode)) {
1335                                 if (!IS_DEVICE(st.st_mode))
1336                                         statret = -1;
1337                                 t = "device file";
1338                         } else {
1339                                 if (!IS_SPECIAL(st.st_mode))
1340                                         statret = -1;
1341                                 t = "special file";
1342                         }
1343                         if (statret == 0
1344                          && BITS_EQUAL(st.st_mode, file->mode, _S_IFMT)
1345                          && st.st_rdev == rdev) {
1346                                 /* The device or special file is identical. */
1347                                 if (itemizing)
1348                                         itemize(file, ndx, 0, &st, 0, 0, NULL);
1349                                 set_file_attrs(fname, file, &st, maybe_ATTRS_REPORT);
1350 #ifdef SUPPORT_HARD_LINKS
1351                                 if (preserve_hard_links && F_IS_HLINKED(file))
1352                                         finish_hard_link(file, fname, &st, itemizing, code, -1);
1353 #endif
1354                                 if (remove_source_files == 1)
1355                                         goto return_with_success;
1356                                 return;
1357                         }
1358                         if (delete_item(fname, st.st_mode, t, del_opts) != 0)
1359                                 return;
1360                 } else if (basis_dir[0] != NULL) {
1361                         int j = try_dests_non(file, fname, ndx, fnamecmpbuf, &st,
1362                                               itemizing, code);
1363                         if (j == -2) {
1364 #ifndef CAN_HARDLINK_SPECIAL
1365                                 if (link_dest) {
1366                                         /* Resort to --copy-dest behavior. */
1367                                 } else
1368 #endif
1369                                 if (!copy_dest)
1370                                         return;
1371                                 itemizing = 0;
1372                                 code = FNONE;
1373                         } else if (j >= 0)
1374                                 statret = 1;
1375                 }
1376 #ifdef SUPPORT_HARD_LINKS
1377                 if (preserve_hard_links && F_HLINK_NOT_LAST(file))
1378                         return;
1379 #endif
1380                 if (verbose > 2) {
1381                         rprintf(FINFO, "mknod(%s, 0%o, [%ld,%ld])\n",
1382                                 fname, (int)file->mode,
1383                                 (long)major(rdev), (long)minor(rdev));
1384                 }
1385                 if (do_mknod(fname, file->mode, rdev) < 0) {
1386                         rsyserr(FERROR, errno, "mknod %s failed",
1387                                 full_fname(fname));
1388                 } else {
1389                         set_file_attrs(fname, file, NULL, 0);
1390                         if (itemizing) {
1391                                 itemize(file, ndx, statret, &st,
1392                                         ITEM_LOCAL_CHANGE, 0, NULL);
1393                         }
1394                         if (code != FNONE && verbose)
1395                                 rprintf(code, "%s\n", fname);
1396 #ifdef SUPPORT_HARD_LINKS
1397                         if (preserve_hard_links && F_IS_HLINKED(file))
1398                                 finish_hard_link(file, fname, NULL, itemizing, code, -1);
1399 #endif
1400                         if (remove_source_files == 1)
1401                                 goto return_with_success;
1402                 }
1403                 return;
1404         }
1405
1406         if (!S_ISREG(file->mode)) {
1407                 if (solo_file)
1408                         fname = f_name(file, NULL);
1409                 rprintf(FINFO, "skipping non-regular file \"%s\"\n", fname);
1410                 return;
1411         }
1412
1413         if (max_size && F_LENGTH(file) > max_size) {
1414                 if (verbose > 1) {
1415                         if (solo_file)
1416                                 fname = f_name(file, NULL);
1417                         rprintf(FINFO, "%s is over max-size\n", fname);
1418                 }
1419                 return;
1420         }
1421         if (min_size && F_LENGTH(file) < min_size) {
1422                 if (verbose > 1) {
1423                         if (solo_file)
1424                                 fname = f_name(file, NULL);
1425                         rprintf(FINFO, "%s is under min-size\n", fname);
1426                 }
1427                 return;
1428         }
1429
1430         if (ignore_existing && statret == 0) {
1431                 if (verbose > 1)
1432                         rprintf(FINFO, "%s exists\n", fname);
1433                 return;
1434         }
1435
1436         if (update_only && statret == 0
1437             && cmp_time(st.st_mtime, file->modtime) > 0) {
1438                 if (verbose > 1)
1439                         rprintf(FINFO, "%s is newer\n", fname);
1440                 return;
1441         }
1442
1443         fnamecmp = fname;
1444         fnamecmp_type = FNAMECMP_FNAME;
1445
1446         if (statret == 0 && !S_ISREG(st.st_mode)) {
1447                 if (delete_item(fname, st.st_mode, "regular file", del_opts) != 0)
1448                         return;
1449                 statret = -1;
1450                 stat_errno = ENOENT;
1451         }
1452
1453         if (statret != 0 && basis_dir[0] != NULL) {
1454                 int j = try_dests_reg(file, fname, ndx, fnamecmpbuf, &st,
1455                                       itemizing, code);
1456                 if (j == -2) {
1457                         if (remove_source_files == 1)
1458                                 goto return_with_success;
1459                         return;
1460                 }
1461                 if (j >= 0) {
1462                         fnamecmp = fnamecmpbuf;
1463                         fnamecmp_type = j;
1464                         statret = 0;
1465                 }
1466         }
1467
1468         real_ret = statret;
1469         real_st = st;
1470
1471         if (partial_dir && (partialptr = partial_dir_fname(fname)) != NULL
1472             && link_stat(partialptr, &partial_st, 0) == 0
1473             && S_ISREG(partial_st.st_mode)) {
1474                 if (statret != 0)
1475                         goto prepare_to_open;
1476         } else
1477                 partialptr = NULL;
1478
1479         if (statret != 0 && fuzzy_dirlist && dry_run <= 1) {
1480                 int j = find_fuzzy(file, fuzzy_dirlist);
1481                 if (j >= 0) {
1482                         fuzzy_file = fuzzy_dirlist->files[j];
1483                         f_name(fuzzy_file, fnamecmpbuf);
1484                         if (verbose > 2) {
1485                                 rprintf(FINFO, "fuzzy basis selected for %s: %s\n",
1486                                         fname, fnamecmpbuf);
1487                         }
1488                         st.st_size = F_LENGTH(fuzzy_file);
1489                         statret = 0;
1490                         fnamecmp = fnamecmpbuf;
1491                         fnamecmp_type = FNAMECMP_FUZZY;
1492                 }
1493         }
1494
1495         if (statret != 0) {
1496 #ifdef SUPPORT_HARD_LINKS
1497                 if (preserve_hard_links && F_HLINK_NOT_LAST(file))
1498                         return;
1499 #endif
1500                 if (stat_errno == ENOENT)
1501                         goto notify_others;
1502                 rsyserr(FERROR, stat_errno, "recv_generator: failed to stat %s",
1503                         full_fname(fname));
1504                 return;
1505         }
1506
1507         if (append_mode && st.st_size > F_LENGTH(file))
1508                 return;
1509
1510         if (fnamecmp_type <= FNAMECMP_BASIS_DIR_HIGH)
1511                 ;
1512         else if (fnamecmp_type == FNAMECMP_FUZZY)
1513                 ;
1514         else if (unchanged_file(fnamecmp, file, &st)) {
1515                 if (partialptr) {
1516                         do_unlink(partialptr);
1517                         handle_partial_dir(partialptr, PDIR_DELETE);
1518                 }
1519                 if (itemizing)
1520                         itemize(file, ndx, statret, &st, 0, 0, NULL);
1521                 set_file_attrs(fname, file, &st, maybe_ATTRS_REPORT);
1522 #ifdef SUPPORT_HARD_LINKS
1523                 if (preserve_hard_links && F_IS_HLINKED(file))
1524                         finish_hard_link(file, fname, &st, itemizing, code, -1);
1525 #endif
1526                 if (remove_source_files != 1)
1527                         return;
1528           return_with_success:
1529                 if (!dry_run)
1530                         send_msg_int(MSG_SUCCESS, ndx);
1531                 return;
1532         }
1533
1534   prepare_to_open:
1535         if (partialptr) {
1536                 st = partial_st;
1537                 fnamecmp = partialptr;
1538                 fnamecmp_type = FNAMECMP_PARTIAL_DIR;
1539                 statret = 0;
1540         }
1541
1542         if (!do_xfers || read_batch || whole_file)
1543                 goto notify_others;
1544
1545         if (fuzzy_dirlist) {
1546                 int j = flist_find(fuzzy_dirlist, file);
1547                 if (j >= 0) /* don't use changing file as future fuzzy basis */
1548                         fuzzy_dirlist->files[j]->flags |= FLAG_SENT;
1549         }
1550
1551         /* open the file */
1552         fd = do_open(fnamecmp, O_RDONLY, 0);
1553
1554         if (fd == -1) {
1555                 rsyserr(FERROR, errno, "failed to open %s, continuing",
1556                         full_fname(fnamecmp));
1557           pretend_missing:
1558                 /* pretend the file didn't exist */
1559 #ifdef SUPPORT_HARD_LINKS
1560                 if (preserve_hard_links && F_HLINK_NOT_LAST(file))
1561                         return;
1562 #endif
1563                 statret = real_ret = -1;
1564                 goto notify_others;
1565         }
1566
1567         if (inplace && make_backups && fnamecmp_type == FNAMECMP_FNAME) {
1568                 if (!(backupptr = get_backup_name(fname))) {
1569                         close(fd);
1570                         return;
1571                 }
1572                 if (!(back_file = make_file(fname, NULL, NULL, 0, NO_FILTERS))) {
1573                         close(fd);
1574                         goto pretend_missing;
1575                 }
1576                 if (robust_unlink(backupptr) && errno != ENOENT) {
1577                         rsyserr(FERROR, errno, "unlink %s",
1578                                 full_fname(backupptr));
1579                         unmake_file(back_file);
1580                         close(fd);
1581                         return;
1582                 }
1583                 if ((f_copy = do_open(backupptr,
1584                     O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0600)) < 0) {
1585                         rsyserr(FERROR, errno, "open %s",
1586                                 full_fname(backupptr));
1587                         unmake_file(back_file);
1588                         close(fd);
1589                         return;
1590                 }
1591                 fnamecmp_type = FNAMECMP_BACKUP;
1592         }
1593
1594         if (verbose > 3) {
1595                 rprintf(FINFO, "gen mapped %s of size %.0f\n",
1596                         fnamecmp, (double)st.st_size);
1597         }
1598
1599         if (verbose > 2)
1600                 rprintf(FINFO, "generating and sending sums for %d\n", ndx);
1601
1602   notify_others:
1603         if (remove_source_files && !delay_updates && !phase)
1604                 increment_active_files(ndx, itemizing, code);
1605 #ifdef SUPPORT_HARD_LINKS
1606         if (preserve_hard_links && F_IS_HLINKED(file))
1607                 file->flags |= FLAG_SENT;
1608 #endif
1609         write_int(f_out, ndx);
1610         if (itemizing) {
1611                 int iflags = ITEM_TRANSFER;
1612                 if (always_checksum)
1613                         iflags |= ITEM_REPORT_CHECKSUM;
1614                 if (fnamecmp_type != FNAMECMP_FNAME)
1615                         iflags |= ITEM_BASIS_TYPE_FOLLOWS;
1616                 if (fnamecmp_type == FNAMECMP_FUZZY)
1617                         iflags |= ITEM_XNAME_FOLLOWS;
1618                 itemize(file, -1, real_ret, &real_st, iflags, fnamecmp_type,
1619                         fuzzy_file ? fuzzy_file->basename : NULL);
1620         }
1621
1622         if (!do_xfers) {
1623 #ifdef SUPPORT_HARD_LINKS
1624                 if (preserve_hard_links && F_IS_HLINKED(file))
1625                         finish_hard_link(file, fname, &st, itemizing, code, -1);
1626 #endif
1627                 return;
1628         }
1629         if (read_batch)
1630                 return;
1631
1632         if (statret != 0 || whole_file) {
1633                 write_sum_head(f_out, NULL);
1634                 return;
1635         }
1636
1637         generate_and_send_sums(fd, st.st_size, f_out, f_copy);
1638
1639         if (f_copy >= 0) {
1640                 close(f_copy);
1641                 set_file_attrs(backupptr, back_file, NULL, 0);
1642                 if (verbose > 1) {
1643                         rprintf(FINFO, "backed up %s to %s\n",
1644                                 fname, backupptr);
1645                 }
1646                 unmake_file(back_file);
1647         }
1648
1649         close(fd);
1650 }
1651
1652 void generate_files(int f_out, struct file_list *flist, char *local_name)
1653 {
1654         int i;
1655         char fbuf[MAXPATHLEN];
1656         int itemizing;
1657         enum logcode code;
1658         int lull_mod = allowed_lull * 5;
1659         int need_retouch_dir_times = preserve_times && !omit_dir_times;
1660         int need_retouch_dir_perms = 0;
1661         int save_ignore_existing = ignore_existing;
1662         int save_ignore_non_existing = ignore_non_existing;
1663         int save_do_progress = do_progress;
1664         int save_make_backups = make_backups;
1665         int dir_tweaking = !(list_only || local_name || dry_run);
1666
1667         if (protocol_version >= 29) {
1668                 itemizing = 1;
1669                 maybe_ATTRS_REPORT = stdout_format_has_i ? 0 : ATTRS_REPORT;
1670                 code = logfile_format_has_i ? FNONE : FLOG;
1671         } else if (am_daemon) {
1672                 itemizing = logfile_format_has_i && do_xfers;
1673                 maybe_ATTRS_REPORT = ATTRS_REPORT;
1674                 code = itemizing || !do_xfers ? FCLIENT : FINFO;
1675         } else if (!am_server) {
1676                 itemizing = stdout_format_has_i;
1677                 maybe_ATTRS_REPORT = stdout_format_has_i ? 0 : ATTRS_REPORT;
1678                 code = itemizing ? FNONE : FINFO;
1679         } else {
1680                 itemizing = 0;
1681                 maybe_ATTRS_REPORT = ATTRS_REPORT;
1682                 code = FINFO;
1683         }
1684         solo_file = local_name != NULL;
1685
1686         if (verbose > 2) {
1687                 rprintf(FINFO, "generator starting pid=%ld count=%d\n",
1688                         (long)getpid(), flist->count);
1689         }
1690
1691         if (delete_before && !local_name && flist->count > 0)
1692                 do_delete_pass(flist);
1693         if (delete_during == 2) {
1694                 deldelay_size = BIGPATHBUFLEN * 4;
1695                 deldelay_buf = new_array(char, deldelay_size);
1696                 if (!deldelay_buf)
1697                         out_of_memory("delete-delay");
1698         }
1699         do_progress = 0;
1700
1701         if (append_mode || whole_file < 0)
1702                 whole_file = 0;
1703         if (verbose >= 2) {
1704                 rprintf(FINFO, "delta-transmission %s\n",
1705                         whole_file
1706                         ? "disabled for local transfer or --whole-file"
1707                         : "enabled");
1708         }
1709
1710         /* Since we often fill up the outgoing socket and then just sit around
1711          * waiting for the other 2 processes to do their thing, we don't want
1712          * to exit on a timeout.  If the data stops flowing, the receiver will
1713          * notice that and let us know via the redo pipe (or its closing). */
1714         ignore_timeout = 1;
1715
1716         for (i = 0; i < flist->count; i++) {
1717                 struct file_struct *file = flist->files[i];
1718
1719                 if (!F_IS_ACTIVE(file))
1720                         continue;
1721
1722                 if (local_name)
1723                         strlcpy(fbuf, local_name, sizeof fbuf);
1724                 else
1725                         f_name(file, fbuf);
1726                 recv_generator(fbuf, file, i, itemizing, code, f_out);
1727
1728                 /* We need to ensure that any dirs we create have writeable
1729                  * permissions during the time we are putting files within
1730                  * them.  This is then fixed after the transfer is done. */
1731 #ifdef HAVE_CHMOD
1732                 if (!am_root && S_ISDIR(file->mode) && !(file->mode & S_IWUSR)
1733                  && dir_tweaking) {
1734                         mode_t mode = file->mode | S_IWUSR; /* user write */
1735                         char *fname = local_name ? local_name : fbuf;
1736                         if (do_chmod(fname, mode) < 0) {
1737                                 rsyserr(FERROR, errno,
1738                                         "failed to modify permissions on %s",
1739                                         full_fname(fname));
1740                         }
1741                         need_retouch_dir_perms = 1;
1742                 }
1743 #endif
1744
1745 #ifdef SUPPORT_HARD_LINKS
1746                 if (preserve_hard_links)
1747                         check_for_finished_hlinks(itemizing, code);
1748 #endif
1749
1750                 if (allowed_lull && !(i % lull_mod))
1751                         maybe_send_keepalive();
1752                 else if (!(i % 200))
1753                         maybe_flush_socket();
1754         }
1755         recv_generator(NULL, NULL, 0, 0, code, -1);
1756         if (delete_during)
1757                 delete_in_dir(NULL, NULL, NULL, NULL);
1758
1759         phase++;
1760         csum_length = SUM_LENGTH;
1761         max_size = min_size = ignore_existing = ignore_non_existing = 0;
1762         update_only = always_checksum = size_only = 0;
1763         ignore_times = 1;
1764         if (append_mode)  /* resend w/o append mode */
1765                 append_mode = -1; /* ... but only longer files */
1766         make_backups = 0; /* avoid a duplicate backup for inplace processing */
1767
1768         if (verbose > 2)
1769                 rprintf(FINFO, "generate_files phase=%d\n", phase);
1770
1771         write_int(f_out, NDX_DONE);
1772
1773         /* files can cycle through the system more than once
1774          * to catch initial checksum errors */
1775         while ((i = get_redo_num(itemizing, code)) != -1) {
1776                 struct file_struct *file = flist->files[i];
1777                 if (local_name)
1778                         strlcpy(fbuf, local_name, sizeof fbuf);
1779                 else
1780                         f_name(file, fbuf);
1781                 recv_generator(fbuf, file, i, itemizing, code, f_out);
1782         }
1783
1784         phase++;
1785         ignore_non_existing = save_ignore_non_existing;
1786         ignore_existing = save_ignore_existing;
1787         make_backups = save_make_backups;
1788
1789         if (verbose > 2)
1790                 rprintf(FINFO, "generate_files phase=%d\n", phase);
1791
1792         write_int(f_out, NDX_DONE);
1793         /* Reduce round-trip lag-time for a useless delay-updates phase. */
1794         if (protocol_version >= 29 && !delay_updates)
1795                 write_int(f_out, NDX_DONE);
1796
1797         /* Read MSG_DONE for the redo phase (and any prior messages). */
1798         get_redo_num(itemizing, code);
1799
1800         if (protocol_version >= 29) {
1801                 phase++;
1802                 if (verbose > 2)
1803                         rprintf(FINFO, "generate_files phase=%d\n", phase);
1804                 if (delay_updates)
1805                         write_int(f_out, NDX_DONE);
1806                 /* Read MSG_DONE for delay-updates phase & prior messages. */
1807                 get_redo_num(itemizing, code);
1808         }
1809
1810         do_progress = save_do_progress;
1811         if (delete_during == 2)
1812                 do_delayed_deletions(fbuf);
1813         if (delete_after && !local_name && flist->count > 0)
1814                 do_delete_pass(flist);
1815
1816         if ((need_retouch_dir_perms || need_retouch_dir_times) && dir_tweaking) {
1817                 int j = 0;
1818                 /* Now we need to fix any directory permissions that were
1819                  * modified during the transfer and/or re-set any tweaked
1820                  * modified-time values. */
1821                 for (i = 0; i < flist->count; i++) {
1822                         struct file_struct *file = flist->files[i];
1823                         if (!F_IS_ACTIVE(file) || !S_ISDIR(file->mode))
1824                                 continue;
1825                         if (!need_retouch_dir_times && file->mode & S_IWUSR)
1826                                 continue;
1827                         if (file->flags & FLAG_MISSING_DIR) {
1828                                 int missing = F_DEPTH(file);
1829                                 while (++i < flist->count) {
1830                                         file = flist->files[i];
1831                                         if (F_DEPTH(file) <= missing)
1832                                                 break;
1833                                 }
1834                                 i--;
1835                                 continue;
1836                         }
1837                         recv_generator(f_name(file, NULL), file, i, itemizing,
1838                                        code, -1);
1839                         if (allowed_lull && !(++j % lull_mod))
1840                                 maybe_send_keepalive();
1841                         else if (!(j % 200))
1842                                 maybe_flush_socket();
1843                 }
1844         }
1845         recv_generator(NULL, NULL, 0, 0, code, -1);
1846
1847         if (max_delete >= 0 && deletion_count > max_delete) {
1848                 rprintf(FINFO,
1849                         "Deletions stopped due to --max-delete limit (%d skipped)\n",
1850                         deletion_count - max_delete);
1851                 io_error |= IOERR_DEL_LIMIT;
1852         }
1853
1854         if (verbose > 2)
1855                 rprintf(FINFO, "generate_files finished\n");
1856 }