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, F_BASENAME(fp), 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 (file->dir.depth >= MAXPATHLEN/2+1)
 434                 return; /* Impossible... */
 435
 436         if (io_error && !(lp_ignore_errors(module_id) || 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 >= file->dir.depth && cur_depth >= min_depth)
 446                 pop_local_filters(filt_array[cur_depth--]);
 447         cur_depth = file->dir.depth;
 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
 524          && (unsigned)(st->st_mode & CHMOD_BITS) != (file->mode & CHMOD_BITS))
 525                 return 0;
 526
 527         if (am_root && preserve_uid && st->st_uid != F_UID(file))
 528                 return 0;
 529
 530         if (preserve_gid && F_GID(file) != GID_NONE && st->st_gid != F_GID(file))
 531                 return 0;
 532
 533         return 1;
 534 }
 535
 536 void itemize(struct file_struct *file, int ndx, int statret, STRUCT_STAT *st,
 537              int32 iflags, uchar fnamecmp_type, const char *xname)
 538 {
 539         if (statret >= 0) { /* A from-dest-dir statret can == 1! */
 540                 int keep_time = !preserve_times ? 0
 541                     : S_ISDIR(file->mode) ? !omit_dir_times
 542                     : !S_ISLNK(file->mode);
 543
 544                 if (S_ISREG(file->mode) && F_LENGTH(file) != st->st_size)
 545                         iflags |= ITEM_REPORT_SIZE;
 546                 if ((iflags & (ITEM_TRANSFER|ITEM_LOCAL_CHANGE) && !keep_time
 547                   && !(iflags & ITEM_MATCHED)
 548                   && (!(iflags & ITEM_XNAME_FOLLOWS) || *xname))
 549                  || (keep_time && cmp_time(file->modtime, st->st_mtime) != 0))
 550                         iflags |= ITEM_REPORT_TIME;
 551                 if ((unsigned)(st->st_mode & CHMOD_BITS) != (file->mode & CHMOD_BITS))
 552                         iflags |= ITEM_REPORT_PERMS;
 553                 if (preserve_uid && am_root && F_UID(file) != st->st_uid)
 554                         iflags |= ITEM_REPORT_OWNER;
 555                 if (preserve_gid && F_GID(file) != GID_NONE
 556                     && st->st_gid != F_GID(file))
 557                         iflags |= ITEM_REPORT_GROUP;
 558         } else
 559                 iflags |= ITEM_IS_NEW;
 560
 561         iflags &= 0xffff;
 562         if ((iflags & SIGNIFICANT_ITEM_FLAGS || verbose > 1
 563           || stdout_format_has_i > 1 || (xname && *xname)) && !read_batch) {
 564                 if (protocol_version >= 29) {
 565                         if (ndx >= 0)
 566                                 write_int(sock_f_out, ndx);
 567                         write_shortint(sock_f_out, iflags);
 568                         if (iflags & ITEM_BASIS_TYPE_FOLLOWS)
 569                                 write_byte(sock_f_out, fnamecmp_type);
 570                         if (iflags & ITEM_XNAME_FOLLOWS)
 571                                 write_vstring(sock_f_out, xname, strlen(xname));
 572                 } else if (ndx >= 0) {
 573                         enum logcode code = logfile_format_has_i ? FINFO : FCLIENT;
 574                         log_item(code, file, &stats, iflags, xname);
 575                 }
 576         }
 577 }
 578
 579
 580 /* Perform our quick-check heuristic for determining if a file is unchanged. */
 581 int unchanged_file(char *fn, struct file_struct *file, STRUCT_STAT *st)
 582 {
 583         if (st->st_size != F_LENGTH(file))
 584                 return 0;
 585
 586         /* if always checksum is set then we use the checksum instead
 587            of the file time to determine whether to sync */
 588         if (always_checksum && S_ISREG(st->st_mode)) {
 589                 char sum[MD4_SUM_LENGTH];
 590                 file_checksum(fn, sum, st->st_size);
 591                 return memcmp(sum, F_SUM(file), checksum_len) == 0;
 592         }
 593
 594         if (size_only)
 595                 return 1;
 596
 597         if (ignore_times)
 598                 return 0;
 599
 600         return cmp_time(st->st_mtime, file->modtime) == 0;
 601 }
 602
 603
 604 /*
 605  * set (initialize) the size entries in the per-file sum_struct
 606  * calculating dynamic block and checksum sizes.
 607  *
 608  * This is only called from generate_and_send_sums() but is a separate
 609  * function to encapsulate the logic.
 610  *
 611  * The block size is a rounded square root of file length.
 612  *
 613  * The checksum size is determined according to:
 614  *     blocksum_bits = BLOCKSUM_BIAS + 2*log2(file_len) - log2(block_len)
 615  * provided by Donovan Baarda which gives a probability of rsync
 616  * algorithm corrupting data and falling back using the whole md4
 617  * checksums.
 618  *
 619  * This might be made one of several selectable heuristics.
 620  */
 621 static void sum_sizes_sqroot(struct sum_struct *sum, int64 len)
 622 {
 623         int32 blength;
 624         int s2length;
 625
 626         if (block_size)
 627                 blength = block_size;
 628         else if (len <= BLOCK_SIZE * BLOCK_SIZE)
 629                 blength = BLOCK_SIZE;
 630         else {
 631                 int32 c;
 632                 int64 l;
 633                 int cnt;
 634                 for (c = 1, l = len, cnt = 0; l >>= 2; c <<= 1, cnt++) {}
 635                 if (cnt >= 31 || c >= MAX_BLOCK_SIZE)
 636                         blength = MAX_BLOCK_SIZE;
 637                 else {
 638                     blength = 0;
 639                     do {
 640                             blength |= c;
 641                             if (len < (int64)blength * blength)
 642                                     blength &= ~c;
 643                             c >>= 1;
 644                     } while (c >= 8);   /* round to multiple of 8 */
 645                     blength = MAX(blength, BLOCK_SIZE);
 646                 }
 647         }
 648
 649         if (protocol_version < 27) {
 650                 s2length = csum_length;
 651         } else if (csum_length == SUM_LENGTH) {
 652                 s2length = SUM_LENGTH;
 653         } else {
 654                 int32 c;
 655                 int64 l;
 656                 int b = BLOCKSUM_BIAS;
 657                 for (l = len; l >>= 1; b += 2) {}
 658                 for (c = blength; (c >>= 1) && b; b--) {}
 659                 /* add a bit, subtract rollsum, round up. */
 660                 s2length = (b + 1 - 32 + 7) / 8; /* --optimize in compiler-- */
 661                 s2length = MAX(s2length, csum_length);
 662                 s2length = MIN(s2length, SUM_LENGTH);
 663         }
 664
 665         sum->flength    = len;
 666         sum->blength    = blength;
 667         sum->s2length   = s2length;
 668         sum->remainder  = (int32)(len % blength);
 669         sum->count      = (int32)(len / blength) + (sum->remainder != 0);
 670
 671         if (sum->count && verbose > 2) {
 672                 rprintf(FINFO,
 673                         "count=%.0f rem=%ld blength=%ld s2length=%d flength=%.0f\n",
 674                         (double)sum->count, (long)sum->remainder, (long)sum->blength,
 675                         sum->s2length, (double)sum->flength);
 676         }
 677 }
 678
 679
 680 /*
 681  * Generate and send a stream of signatures/checksums that describe a buffer
 682  *
 683  * Generate approximately one checksum every block_len bytes.
 684  */
 685 static void generate_and_send_sums(int fd, OFF_T len, int f_out, int f_copy)
 686 {
 687         int32 i;
 688         struct map_struct *mapbuf;
 689         struct sum_struct sum;
 690         OFF_T offset = 0;
 691
 692         sum_sizes_sqroot(&sum, len);
 693         write_sum_head(f_out, &sum);
 694
 695         if (append_mode > 0 && f_copy < 0)
 696                 return;
 697
 698         if (len > 0)
 699                 mapbuf = map_file(fd, len, MAX_MAP_SIZE, sum.blength);
 700         else
 701                 mapbuf = NULL;
 702
 703         for (i = 0; i < sum.count; i++) {
 704                 int32 n1 = (int32)MIN(len, (OFF_T)sum.blength);
 705                 char *map = map_ptr(mapbuf, offset, n1);
 706                 char sum2[SUM_LENGTH];
 707                 uint32 sum1;
 708
 709                 len -= n1;
 710                 offset += n1;
 711
 712                 if (f_copy >= 0) {
 713                         full_write(f_copy, map, n1);
 714                         if (append_mode > 0)
 715                                 continue;
 716                 }
 717
 718                 sum1 = get_checksum1(map, n1);
 719                 get_checksum2(map, n1, sum2);
 720
 721                 if (verbose > 3) {
 722                         rprintf(FINFO,
 723                                 "chunk[%.0f] offset=%.0f len=%ld sum1=%08lx\n",
 724                                 (double)i, (double)offset - n1, (long)n1,
 725                                 (unsigned long)sum1);
 726                 }
 727                 write_int(f_out, sum1);
 728                 write_buf(f_out, sum2, sum.s2length);
 729         }
 730
 731         if (mapbuf)
 732                 unmap_file(mapbuf);
 733 }
 734
 735
 736 /* Try to find a filename in the same dir as "fname" with a similar name. */
 737 static int find_fuzzy(struct file_struct *file, struct file_list *dirlist)
 738 {
 739         int fname_len, fname_suf_len;
 740         const char *fname_suf, *fname = F_BASENAME(file);
 741         uint32 lowest_dist = 25 << 16; /* ignore a distance greater than 25 */
 742         int j, lowest_j = -1;
 743
 744         fname_len = strlen(fname);
 745         fname_suf = find_filename_suffix(fname, fname_len, &fname_suf_len);
 746
 747         for (j = 0; j < dirlist->count; j++) {
 748                 struct file_struct *fp = dirlist->files[j];
 749                 const char *suf, *name;
 750                 int len, suf_len;
 751                 uint32 dist;
 752
 753                 if (!S_ISREG(fp->mode) || !F_LENGTH(fp) || fp->flags & FLAG_SENT)
 754                         continue;
 755
 756                 name = F_BASENAME(fp);
 757
 758                 if (F_LENGTH(fp) == F_LENGTH(file)
 759                     && cmp_time(fp->modtime, file->modtime) == 0) {
 760                         if (verbose > 4) {
 761                                 rprintf(FINFO,
 762                                         "fuzzy size/modtime match for %s\n",
 763                                         name);
 764                         }
 765                         return j;
 766                 }
 767
 768                 len = strlen(name);
 769                 suf = find_filename_suffix(name, len, &suf_len);
 770
 771                 dist = fuzzy_distance(name, len, fname, fname_len);
 772                 /* Add some extra weight to how well the suffixes match. */
 773                 dist += fuzzy_distance(suf, suf_len, fname_suf, fname_suf_len)
 774                       * 10;
 775                 if (verbose > 4) {
 776                         rprintf(FINFO, "fuzzy distance for %s = %d.%05d\n",
 777                                 name, (int)(dist>>16), (int)(dist&0xFFFF));
 778                 }
 779                 if (dist <= lowest_dist) {
 780                         lowest_dist = dist;
 781                         lowest_j = j;
 782                 }
 783         }
 784
 785         return lowest_j;
 786 }
 787
 788 #ifdef SUPPORT_HARD_LINKS
 789 void check_for_finished_hlinks(int itemizing, enum logcode code)
 790 {
 791         struct file_struct *file;
 792         char fbuf[MAXPATHLEN];
 793         int ndx;
 794
 795         while ((ndx = get_hlink_num()) != -1) {
 796                 if (ndx < 0 || ndx >= the_file_list->count)
 797                         continue;
 798
 799                 file = the_file_list->files[ndx];
 800                 if (!F_IS_HLINKED(file))
 801                         continue;
 802
 803                 finish_hard_link(file, f_name(file, fbuf), NULL, itemizing, code, -1);
 804         }
 805 }
 806 #endif
 807
 808 /* This is only called for regular files.  We return -2 if we've finished
 809  * handling the file, -1 if no dest-linking occurred, or a non-negative
 810  * value if we found an alternate basis file. */
 811 static int try_dests_reg(struct file_struct *file, char *fname, int ndx,
 812                          char *cmpbuf, STRUCT_STAT *stp, int itemizing,
 813                          enum logcode code)
 814 {
 815         int best_match = -1;
 816         int match_level = 0;
 817         int j = 0;
 818
 819         do {
 820                 pathjoin(cmpbuf, MAXPATHLEN, basis_dir[j], fname);
 821                 if (link_stat(cmpbuf, stp, 0) < 0 || !S_ISREG(stp->st_mode))
 822                         continue;
 823                 switch (match_level) {
 824                 case 0:
 825                         best_match = j;
 826                         match_level = 1;
 827                         /* FALL THROUGH */
 828                 case 1:
 829                         if (!unchanged_file(cmpbuf, file, stp))
 830                                 continue;
 831                         best_match = j;
 832                         match_level = 2;
 833                         /* FALL THROUGH */
 834                 case 2:
 835                         if (!unchanged_attrs(file, stp))
 836                                 continue;
 837                         if (always_checksum && preserve_times
 838                          && cmp_time(stp->st_mtime, file->modtime))
 839                                 continue;
 840                         best_match = j;
 841                         match_level = 3;
 842                         break;
 843                 }
 844                 break;
 845         } while (basis_dir[++j] != NULL);
 846
 847         if (!match_level)
 848                 return -1;
 849
 850         if (j != best_match) {
 851                 j = best_match;
 852                 pathjoin(cmpbuf, MAXPATHLEN, basis_dir[j], fname);
 853                 if (link_stat(cmpbuf, stp, 0) < 0)
 854                         return -1;
 855         }
 856
 857         if (match_level == 3 && !copy_dest) {
 858 #ifdef SUPPORT_HARD_LINKS
 859                 if (link_dest) {
 860                         if (!hard_link_one(file, fname, cmpbuf, 1))
 861                                 goto try_a_copy;
 862                         if (preserve_hard_links && F_IS_HLINKED(file))
 863                                 finish_hard_link(file, fname, stp, itemizing, code, j);
 864                         if (itemizing && (verbose > 1 || stdout_format_has_i > 1)) {
 865                                 itemize(file, ndx, 1, stp,
 866                                         ITEM_LOCAL_CHANGE | ITEM_XNAME_FOLLOWS,
 867                                         0, "");
 868                         }
 869                 } else
 870 #endif
 871                 if (itemizing)
 872                         itemize(file, ndx, 0, stp, 0, 0, NULL);
 873                 if (verbose > 1 && maybe_ATTRS_REPORT)
 874                         rprintf(FCLIENT, "%s is uptodate\n", fname);
 875                 return -2;
 876         }
 877
 878         if (match_level >= 2) {
 879 #ifdef SUPPORT_HARD_LINKS
 880           try_a_copy: /* Copy the file locally. */
 881 #endif
 882                 if (copy_file(cmpbuf, fname, file->mode) < 0) {
 883                         if (verbose) {
 884                                 rsyserr(FINFO, errno, "copy_file %s => %s",
 885                                         full_fname(cmpbuf), fname);
 886                         }
 887                         return -1;
 888                 }
 889                 if (itemizing)
 890                         itemize(file, ndx, 0, stp, ITEM_LOCAL_CHANGE, 0, NULL);
 891                 set_file_attrs(fname, file, NULL, 0);
 892                 if (maybe_ATTRS_REPORT
 893                  && ((!itemizing && verbose && match_level == 2)
 894                   || (verbose > 1 && match_level == 3))) {
 895                         code = match_level == 3 ? FCLIENT : FINFO;
 896                         rprintf(code, "%s%s\n", fname,
 897                                 match_level == 3 ? " is uptodate" : "");
 898                 }
 899 #ifdef SUPPORT_HARD_LINKS
 900                 if (preserve_hard_links && F_IS_HLINKED(file))
 901                         finish_hard_link(file, fname, stp, itemizing, code, -1);
 902 #endif
 903                 return -2;
 904         }
 905
 906         return FNAMECMP_BASIS_DIR_LOW + j;
 907 }
 908
 909 /* This is only called for non-regular files.  We return -2 if we've finished
 910  * handling the file, or -1 if no dest-linking occurred, or a non-negative
 911  * value if we found an alternate basis file. */
 912 static int try_dests_non(struct file_struct *file, char *fname, int ndx,
 913                          char *cmpbuf, STRUCT_STAT *stp, int itemizing,
 914                          enum logcode code)
 915 {
 916         char lnk[MAXPATHLEN];
 917         int best_match = -1;
 918         int match_level = 0;
 919         enum nonregtype type;
 920         uint32 *devp;
 921         int len, j = 0;
 922
 923 #ifndef SUPPORT_LINKS
 924         if (S_ISLNK(file->mode))
 925                 return -1;
 926 #endif
 927         if (S_ISDIR(file->mode)) {
 928                 type = TYPE_DIR;
 929         } else if (IS_SPECIAL(file->mode))
 930                 type = TYPE_SPECIAL;
 931         else if (IS_DEVICE(file->mode))
 932                 type = TYPE_DEVICE;
 933 #ifdef SUPPORT_LINKS
 934         else if (S_ISLNK(file->mode))
 935                 type = TYPE_SYMLINK;
 936 #endif
 937         else {
 938                 rprintf(FERROR,
 939                         "internal: try_dests_non() called with invalid mode (%o)\n",
 940                         (int)file->mode);
 941                 exit_cleanup(RERR_UNSUPPORTED);
 942         }
 943
 944         do {
 945                 pathjoin(cmpbuf, MAXPATHLEN, basis_dir[j], fname);
 946                 if (link_stat(cmpbuf, stp, 0) < 0)
 947                         continue;
 948                 switch (type) {
 949                 case TYPE_DIR:
 950                         if (!S_ISDIR(stp->st_mode))
 951                                 continue;
 952                         break;
 953                 case TYPE_SPECIAL:
 954                         if (!IS_SPECIAL(stp->st_mode))
 955                                 continue;
 956                         break;
 957                 case TYPE_DEVICE:
 958                         if (!IS_DEVICE(stp->st_mode))
 959                                 continue;
 960                         break;
 961 #ifdef SUPPORT_LINKS
 962                 case TYPE_SYMLINK:
 963                         if (!S_ISLNK(stp->st_mode))
 964                                 continue;
 965                         break;
 966 #endif
 967                 }
 968                 if (match_level < 1) {
 969                         match_level = 1;
 970                         best_match = j;
 971                 }
 972                 switch (type) {
 973                 case TYPE_DIR:
 974                         break;
 975                 case TYPE_SPECIAL:
 976                 case TYPE_DEVICE:
 977                         devp = F_RDEV_P(file);
 978                         if (stp->st_rdev != MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp)))
 979                                 continue;
 980                         break;
 981 #ifdef SUPPORT_LINKS
 982                 case TYPE_SYMLINK:
 983                         if ((len = readlink(cmpbuf, lnk, MAXPATHLEN-1)) <= 0)
 984                                 continue;
 985                         lnk[len] = '\0';
 986                         if (strcmp(lnk, F_SYMLINK(file)) != 0)
 987                                 continue;
 988                         break;
 989 #endif
 990                 }
 991                 if (match_level < 2) {
 992                         match_level = 2;
 993                         best_match = j;
 994                 }
 995                 if (unchanged_attrs(file, stp)) {
 996                         match_level = 3;
 997                         best_match = j;
 998                         break;
 999                 }
1000         } while (basis_dir[++j] != NULL);
1001
1002         if (!match_level)
1003                 return -1;
1004
1005         if (j != best_match) {
1006                 j = best_match;
1007                 pathjoin(cmpbuf, MAXPATHLEN, basis_dir[j], fname);
1008                 if (link_stat(cmpbuf, stp, 0) < 0)
1009                         return -1;
1010         }
1011
1012         if (match_level == 3) {
1013 #ifdef SUPPORT_HARD_LINKS
1014                 if (link_dest
1015 #ifndef CAN_HARDLINK_SYMLINK
1016                  && !S_ISLNK(file->mode)
1017 #endif
1018 #ifndef CAN_HARDLINK_SPECIAL
1019                  && !IS_SPECIAL(file->mode) && !IS_DEVICE(file->mode)
1020 #endif
1021                  && !S_ISDIR(file->mode)) {
1022                         if (do_link(cmpbuf, fname) < 0) {
1023                                 rsyserr(FERROR, errno,
1024                                         "failed to hard-link %s with %s",
1025                                         cmpbuf, fname);
1026                                 return j;
1027                         }
1028                         if (preserve_hard_links && F_IS_HLINKED(file))
1029                                 finish_hard_link(file, fname, NULL, itemizing, code, -1);
1030                 } else
1031 #endif
1032                         match_level = 2;
1033                 if (itemizing && stdout_format_has_i
1034                  && (verbose > 1 || stdout_format_has_i > 1)) {
1035                         int chg = compare_dest && type != TYPE_DIR ? 0
1036                             : ITEM_LOCAL_CHANGE
1037                              + (match_level == 3 ? ITEM_XNAME_FOLLOWS : 0);
1038                         char *lp = match_level == 3 ? "" : NULL;
1039                         itemize(file, ndx, 0, stp, chg + ITEM_MATCHED, 0, lp);
1040                 }
1041                 if (verbose > 1 && maybe_ATTRS_REPORT) {
1042                         rprintf(FCLIENT, "%s%s is uptodate\n",
1043                                 fname, type == TYPE_DIR ? "/" : "");
1044                 }
1045                 return -2;
1046         }
1047
1048         return j;
1049 }
1050
1051 static int phase = 0;
1052
1053 /* Acts on the_file_list->file's ndx'th item, whose name is fname.  If a dir,
1054  * make sure it exists, and has the right permissions/timestamp info.  For
1055  * all other non-regular files (symlinks, etc.) we create them here.  For
1056  * regular files that have changed, we try to find a basis file and then
1057  * start sending checksums.
1058  *
1059  * When fname is non-null, it must point to a MAXPATHLEN buffer!
1060  *
1061  * Note that f_out is set to -1 when doing final directory-permission and
1062  * modification-time repair. */
1063 static void recv_generator(char *fname, struct file_struct *file, int ndx,
1064                            int itemizing, enum logcode code, int f_out)
1065 {
1066         static int missing_below = -1, excluded_below = -1;
1067         static const char *parent_dirname = "";
1068         static struct file_list *fuzzy_dirlist = NULL;
1069         static int need_fuzzy_dirlist = 0;
1070         struct file_struct *fuzzy_file = NULL;
1071         int fd = -1, f_copy = -1;
1072         STRUCT_STAT st, real_st, partial_st;
1073         struct file_struct *back_file = NULL;
1074         int statret, real_ret, stat_errno;
1075         char *fnamecmp, *partialptr, *backupptr = NULL;
1076         char fnamecmpbuf[MAXPATHLEN];
1077         uchar fnamecmp_type;
1078         int del_opts = delete_mode || force_delete ? DEL_RECURSE : 0;
1079
1080         if (list_only)
1081                 return;
1082
1083         if (!fname) {
1084                 if (fuzzy_dirlist) {
1085                         flist_free(fuzzy_dirlist);
1086                         fuzzy_dirlist = NULL;
1087                 }
1088                 if (missing_below >= 0) {
1089                         if (dry_run)
1090                                 dry_run--;
1091                         missing_below = -1;
1092                 }
1093                 parent_dirname = "";
1094                 return;
1095         }
1096
1097         if (verbose > 2)
1098                 rprintf(FINFO, "recv_generator(%s,%d)\n", fname, ndx);
1099
1100         if (server_filter_list.head) {
1101                 if (excluded_below >= 0) {
1102                         if (file->dir.depth > excluded_below)
1103                                 goto skipping;
1104                         excluded_below = -1;
1105                 }
1106                 if (check_filter(&server_filter_list, fname,
1107                                  S_ISDIR(file->mode)) < 0) {
1108                         if (S_ISDIR(file->mode))
1109                                 excluded_below = file->dir.depth;
1110                   skipping:
1111                         if (verbose) {
1112                                 rprintf(FINFO,
1113                                         "skipping server-excluded file \"%s\"\n",
1114                                         fname);
1115                         }
1116                         return;
1117                 }
1118         }
1119
1120         if (missing_below >= 0) {
1121                 if (file->dir.depth <= missing_below) {
1122                         if (dry_run)
1123                                 dry_run--;
1124                         missing_below = -1;
1125                 } else if (!dry_run)
1126                         return;
1127         }
1128         if (dry_run > 1) {
1129                 statret = -1;
1130                 stat_errno = ENOENT;
1131         } else {
1132                 const char *dn = file->dirname ? file->dirname : ".";
1133                 if (parent_dirname != dn && strcmp(parent_dirname, dn) != 0) {
1134                         if (relative_paths && !implied_dirs
1135                          && do_stat(dn, &st) < 0
1136                          && create_directory_path(fname) < 0) {
1137                                 rsyserr(FERROR, errno,
1138                                         "recv_generator: mkdir %s failed",
1139                                         full_fname(dn));
1140                         }
1141                         if (fuzzy_dirlist) {
1142                                 flist_free(fuzzy_dirlist);
1143                                 fuzzy_dirlist = NULL;
1144                         }
1145                         if (fuzzy_basis)
1146                                 need_fuzzy_dirlist = 1;
1147                 }
1148                 parent_dirname = dn;
1149
1150                 if (need_fuzzy_dirlist && S_ISREG(file->mode)) {
1151                         strlcpy(fnamecmpbuf, dn, sizeof fnamecmpbuf);
1152                         fuzzy_dirlist = get_dirlist(fnamecmpbuf, -1, 1);
1153                         need_fuzzy_dirlist = 0;
1154                 }
1155
1156                 statret = link_stat(fname, &st,
1157                                     keep_dirlinks && S_ISDIR(file->mode));
1158                 stat_errno = errno;
1159         }
1160
1161         if (ignore_non_existing && statret == -1 && stat_errno == ENOENT) {
1162                 if (verbose > 1) {
1163                         rprintf(FINFO, "not creating new %s \"%s\"\n",
1164                                 S_ISDIR(file->mode) ? "directory" : "file",
1165                                 fname);
1166                 }
1167                 return;
1168         }
1169
1170         /* If we're not preserving permissions, change the file-list's
1171          * mode based on the local permissions and some heuristics. */
1172         if (!preserve_perms) {
1173                 int exists = statret == 0
1174                           && S_ISDIR(st.st_mode) == S_ISDIR(file->mode);
1175                 file->mode = dest_mode(file->mode, st.st_mode, exists);
1176         }
1177
1178         if (S_ISDIR(file->mode)) {
1179                 /* The file to be received is a directory, so we need
1180                  * to prepare appropriately.  If there is already a
1181                  * file of that name and it is *not* a directory, then
1182                  * we need to delete it.  If it doesn't exist, then
1183                  * (perhaps recursively) create it. */
1184                 if (statret == 0 && !S_ISDIR(st.st_mode)) {
1185                         if (delete_item(fname, st.st_mode, "directory", del_opts) != 0)
1186                                 return;
1187                         statret = -1;
1188                 }
1189                 if (dry_run && statret != 0 && missing_below < 0) {
1190                         missing_below = file->dir.depth;
1191                         dry_run++;
1192                 }
1193                 real_ret = statret;
1194                 real_st = st;
1195                 if (new_root_dir) {
1196                         if (*fname == '.' && fname[1] == '\0')
1197                                 statret = -1;
1198                         new_root_dir = 0;
1199                 }
1200                 if (statret != 0 && basis_dir[0] != NULL) {
1201                         int j = try_dests_non(file, fname, ndx, fnamecmpbuf, &st,
1202                                               itemizing, code);
1203                         if (j == -2) {
1204                                 itemizing = 0;
1205                                 code = FNONE;
1206                         } else if (j >= 0)
1207                                 statret = 1;
1208                 }
1209                 if (itemizing && f_out != -1) {
1210                         itemize(file, ndx, statret, &st,
1211                                 statret ? ITEM_LOCAL_CHANGE : 0, 0, NULL);
1212                 }
1213                 if (real_ret != 0 && do_mkdir(fname,file->mode) < 0 && errno != EEXIST) {
1214                         if (!relative_paths || errno != ENOENT
1215                             || create_directory_path(fname) < 0
1216                             || (do_mkdir(fname, file->mode) < 0 && errno != EEXIST)) {
1217                                 rsyserr(FERROR, errno,
1218                                         "recv_generator: mkdir %s failed",
1219                                         full_fname(fname));
1220                                 file->flags |= FLAG_MISSING_DIR;
1221                                 if (ndx+1 < the_file_list->count
1222                                  && the_file_list->files[ndx+1]->dir.depth > file->dir.depth) {
1223                                         rprintf(FERROR,
1224                                             "*** Skipping everything below this failed directory ***\n");
1225                                         missing_below = file->dir.depth;
1226                                 }
1227                                 return;
1228                         }
1229                 }
1230                 if (set_file_attrs(fname, file, real_ret ? NULL : &real_st, 0)
1231                     && verbose && code != FNONE && f_out != -1)
1232                         rprintf(code, "%s/\n", fname);
1233                 if (real_ret != 0 && one_file_system)
1234                         real_st.st_dev = filesystem_dev;
1235                 if (delete_during && f_out != -1 && !phase && dry_run < 2
1236                     && (file->flags & FLAG_XFER_DIR))
1237                         delete_in_dir(the_file_list, fname, file, &real_st);
1238                 return;
1239         }
1240
1241 #ifdef SUPPORT_HARD_LINKS
1242         if (preserve_hard_links && F_NOT_HLINK_FIRST(file)
1243          && hard_link_check(file, ndx, fname, statret, &st, itemizing, code))
1244                 return;
1245 #endif
1246
1247         if (preserve_links && S_ISLNK(file->mode)) {
1248 #ifdef SUPPORT_LINKS
1249                 const char *sl = F_SYMLINK(file);
1250                 if (safe_symlinks && unsafe_symlink(sl, fname)) {
1251                         if (verbose) {
1252                                 if (solo_file)
1253                                         fname = f_name(file, NULL);
1254                                 rprintf(FINFO,
1255                                         "ignoring unsafe symlink %s -> \"%s\"\n",
1256                                         full_fname(fname), sl);
1257                         }
1258                         return;
1259                 }
1260                 if (statret == 0) {
1261                         char lnk[MAXPATHLEN];
1262                         int len;
1263
1264                         if (!S_ISLNK(st.st_mode))
1265                                 statret = -1;
1266                         else if ((len = readlink(fname, lnk, MAXPATHLEN-1)) > 0
1267                               && strncmp(lnk, sl, len) == 0 && sl[len] == '\0') {
1268                                 /* The link is pointing to the right place. */
1269                                 if (itemizing)
1270                                         itemize(file, ndx, 0, &st, 0, 0, NULL);
1271                                 set_file_attrs(fname, file, &st, maybe_ATTRS_REPORT);
1272 #ifdef SUPPORT_HARD_LINKS
1273                                 if (preserve_hard_links && F_IS_HLINKED(file))
1274                                         finish_hard_link(file, fname, &st, itemizing, code, -1);
1275 #endif
1276                                 if (remove_source_files == 1)
1277                                         goto return_with_success;
1278                                 return;
1279                         }
1280                         /* Not the right symlink (or not a symlink), so
1281                          * delete it. */
1282                         if (delete_item(fname, st.st_mode, "symlink", del_opts) != 0)
1283                                 return;
1284                 } else if (basis_dir[0] != NULL) {
1285                         int j = try_dests_non(file, fname, ndx, fnamecmpbuf, &st,
1286                                               itemizing, code);
1287                         if (j == -2) {
1288 #ifndef CAN_HARDLINK_SYMLINK
1289                                 if (link_dest) {
1290                                         /* Resort to --copy-dest behavior. */
1291                                 } else
1292 #endif
1293                                 if (!copy_dest)
1294                                         return;
1295                                 itemizing = 0;
1296                                 code = FNONE;
1297                         } else if (j >= 0)
1298                                 statret = 1;
1299                 }
1300 #ifdef SUPPORT_HARD_LINKS
1301                 if (preserve_hard_links && F_NOT_HLINK_LAST(file))
1302                         return;
1303 #endif
1304                 if (do_symlink(sl, fname) != 0) {
1305                         rsyserr(FERROR, errno, "symlink %s -> \"%s\" failed",
1306                                 full_fname(fname), sl);
1307                 } else {
1308                         set_file_attrs(fname, file, NULL, 0);
1309                         if (itemizing) {
1310                                 itemize(file, ndx, statret, &st,
1311                                         ITEM_LOCAL_CHANGE, 0, NULL);
1312                         }
1313                         if (code != FNONE && verbose)
1314                                 rprintf(code, "%s -> %s\n", fname, sl);
1315 #ifdef SUPPORT_HARD_LINKS
1316                         if (preserve_hard_links && F_IS_HLINKED(file))
1317                                 finish_hard_link(file, fname, NULL, itemizing, code, -1);
1318 #endif
1319                         /* This does not check remove_source_files == 1
1320                          * because this is one of the items that the old
1321                          * --remove-sent-files option would remove. */
1322                         if (remove_source_files)
1323                                 goto return_with_success;
1324                 }
1325 #endif
1326                 return;
1327         }
1328
1329         if ((am_root && preserve_devices && IS_DEVICE(file->mode))
1330          || (preserve_specials && IS_SPECIAL(file->mode))) {
1331                 uint32 *devp = F_RDEV_P(file);
1332                 dev_t rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp));
1333                 if (statret == 0) {
1334                         char *t;
1335                         if (IS_DEVICE(file->mode)) {
1336                                 if (!IS_DEVICE(st.st_mode))
1337                                         statret = -1;
1338                                 t = "device file";
1339                         } else {
1340                                 if (!IS_SPECIAL(st.st_mode))
1341                                         statret = -1;
1342                                 t = "special file";
1343                         }
1344                         if (statret == 0
1345                          && (unsigned)(st.st_mode & ~CHMOD_BITS) == (file->mode & ~CHMOD_BITS)
1346                          && st.st_rdev == rdev) {
1347                                 /* The device or special file is identical. */
1348                                 if (itemizing)
1349                                         itemize(file, ndx, 0, &st, 0, 0, NULL);
1350                                 set_file_attrs(fname, file, &st, maybe_ATTRS_REPORT);
1351 #ifdef SUPPORT_HARD_LINKS
1352                                 if (preserve_hard_links && F_IS_HLINKED(file))
1353                                         finish_hard_link(file, fname, &st, itemizing, code, -1);
1354 #endif
1355                                 if (remove_source_files == 1)
1356                                         goto return_with_success;
1357                                 return;
1358                         }
1359                         if (delete_item(fname, st.st_mode, t, del_opts) != 0)
1360                                 return;
1361                 } else if (basis_dir[0] != NULL) {
1362                         int j = try_dests_non(file, fname, ndx, fnamecmpbuf, &st,
1363                                               itemizing, code);
1364                         if (j == -2) {
1365 #ifndef CAN_HARDLINK_SPECIAL
1366                                 if (link_dest) {
1367                                         /* Resort to --copy-dest behavior. */
1368                                 } else
1369 #endif
1370                                 if (!copy_dest)
1371                                         return;
1372                                 itemizing = 0;
1373                                 code = FNONE;
1374                         } else if (j >= 0)
1375                                 statret = 1;
1376                 }
1377 #ifdef SUPPORT_HARD_LINKS
1378                 if (preserve_hard_links && F_NOT_HLINK_LAST(file))
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                                 finish_hard_link(file, fname, NULL, 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, 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_NOT_HLINK_LAST(file))
1499                         return;
1500 #endif
1501                 if (stat_errno == ENOENT)
1502                         goto notify_others;
1503                 rsyserr(FERROR, stat_errno, "recv_generator: failed to stat %s",
1504                         full_fname(fname));
1505                 return;
1506         }
1507
1508         if (append_mode && st.st_size > F_LENGTH(file))
1509                 return;
1510
1511         if (fnamecmp_type <= FNAMECMP_BASIS_DIR_HIGH)
1512                 ;
1513         else if (fnamecmp_type == FNAMECMP_FUZZY)
1514                 ;
1515         else if (unchanged_file(fnamecmp, file, &st)) {
1516                 if (partialptr) {
1517                         do_unlink(partialptr);
1518                         handle_partial_dir(partialptr, PDIR_DELETE);
1519                 }
1520                 if (itemizing)
1521                         itemize(file, ndx, statret, &st, 0, 0, NULL);
1522                 set_file_attrs(fname, file, &st, maybe_ATTRS_REPORT);
1523 #ifdef SUPPORT_HARD_LINKS
1524                 if (preserve_hard_links && F_IS_HLINKED(file))
1525                         finish_hard_link(file, fname, &st, itemizing, code, -1);
1526 #endif
1527                 if (remove_source_files != 1)
1528                         return;
1529           return_with_success:
1530                 if (!dry_run)
1531                         send_msg_int(MSG_SUCCESS, ndx);
1532                 return;
1533         }
1534
1535   prepare_to_open:
1536         if (partialptr) {
1537                 st = partial_st;
1538                 fnamecmp = partialptr;
1539                 fnamecmp_type = FNAMECMP_PARTIAL_DIR;
1540                 statret = 0;
1541         }
1542
1543         if (!do_xfers || read_batch || whole_file)
1544                 goto notify_others;
1545
1546         if (fuzzy_dirlist) {
1547                 int j = flist_find(fuzzy_dirlist, file);
1548                 if (j >= 0) /* don't use changing file as future fuzzy basis */
1549                         fuzzy_dirlist->files[j]->flags |= FLAG_SENT;
1550         }
1551
1552         /* open the file */
1553         fd = do_open(fnamecmp, O_RDONLY, 0);
1554
1555         if (fd == -1) {
1556                 rsyserr(FERROR, errno, "failed to open %s, continuing",
1557                         full_fname(fnamecmp));
1558           pretend_missing:
1559                 /* pretend the file didn't exist */
1560 #ifdef SUPPORT_HARD_LINKS
1561                 if (preserve_hard_links && F_NOT_HLINK_LAST(file))
1562                         return;
1563 #endif
1564                 statret = real_ret = -1;
1565                 goto notify_others;
1566         }
1567
1568         if (inplace && make_backups && fnamecmp_type == FNAMECMP_FNAME) {
1569                 if (!(backupptr = get_backup_name(fname))) {
1570                         close(fd);
1571                         return;
1572                 }
1573                 if (!(back_file = make_file(fname, NULL, NULL, 0, NO_FILTERS))) {
1574                         close(fd);
1575                         goto pretend_missing;
1576                 }
1577                 if (robust_unlink(backupptr) && errno != ENOENT) {
1578                         rsyserr(FERROR, errno, "unlink %s",
1579                                 full_fname(backupptr));
1580                         unmake_file(back_file);
1581                         close(fd);
1582                         return;
1583                 }
1584                 if ((f_copy = do_open(backupptr,
1585                     O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0600)) < 0) {
1586                         rsyserr(FERROR, errno, "open %s",
1587                                 full_fname(backupptr));
1588                         unmake_file(back_file);
1589                         close(fd);
1590                         return;
1591                 }
1592                 fnamecmp_type = FNAMECMP_BACKUP;
1593         }
1594
1595         if (verbose > 3) {
1596                 rprintf(FINFO, "gen mapped %s of size %.0f\n",
1597                         fnamecmp, (double)st.st_size);
1598         }
1599
1600         if (verbose > 2)
1601                 rprintf(FINFO, "generating and sending sums for %d\n", ndx);
1602
1603   notify_others:
1604         if (remove_source_files && !delay_updates && !phase)
1605                 increment_active_files(ndx, itemizing, code);
1606 #ifdef SUPPORT_HARD_LINKS
1607         if (preserve_hard_links && F_IS_HLINKED(file))
1608                 file->flags |= FLAG_SENT;
1609 #endif
1610         write_int(f_out, ndx);
1611         if (itemizing) {
1612                 int iflags = ITEM_TRANSFER;
1613                 if (always_checksum)
1614                         iflags |= ITEM_REPORT_CHECKSUM;
1615                 if (fnamecmp_type != FNAMECMP_FNAME)
1616                         iflags |= ITEM_BASIS_TYPE_FOLLOWS;
1617                 if (fnamecmp_type == FNAMECMP_FUZZY)
1618                         iflags |= ITEM_XNAME_FOLLOWS;
1619                 itemize(file, -1, real_ret, &real_st, iflags, fnamecmp_type,
1620                         fuzzy_file ? F_BASENAME(fuzzy_file) : NULL);
1621         }
1622
1623         if (!do_xfers) {
1624 #ifdef SUPPORT_HARD_LINKS
1625                 if (preserve_hard_links && F_IS_HLINKED(file))
1626                         finish_hard_link(file, fname, &st, itemizing, code, -1);
1627 #endif
1628                 return;
1629         }
1630         if (read_batch)
1631                 return;
1632
1633         if (statret != 0 || whole_file) {
1634                 write_sum_head(f_out, NULL);
1635                 return;
1636         }
1637
1638         generate_and_send_sums(fd, st.st_size, f_out, f_copy);
1639
1640         if (f_copy >= 0) {
1641                 close(f_copy);
1642                 set_file_attrs(backupptr, back_file, NULL, 0);
1643                 if (verbose > 1) {
1644                         rprintf(FINFO, "backed up %s to %s\n",
1645                                 fname, backupptr);
1646                 }
1647                 unmake_file(back_file);
1648         }
1649
1650         close(fd);
1651 }
1652
1653 void generate_files(int f_out, struct file_list *flist, char *local_name)
1654 {
1655         int i;
1656         char fbuf[MAXPATHLEN];
1657         int itemizing;
1658         enum logcode code;
1659         int lull_mod = allowed_lull * 5;
1660         int need_retouch_dir_times = preserve_times && !omit_dir_times;
1661         int need_retouch_dir_perms = 0;
1662         int save_ignore_existing = ignore_existing;
1663         int save_ignore_non_existing = ignore_non_existing;
1664         int save_do_progress = do_progress;
1665         int save_make_backups = make_backups;
1666         int dir_tweaking = !(list_only || local_name || dry_run);
1667
1668         if (protocol_version >= 29) {
1669                 itemizing = 1;
1670                 maybe_ATTRS_REPORT = stdout_format_has_i ? 0 : ATTRS_REPORT;
1671                 code = logfile_format_has_i ? FNONE : FLOG;
1672         } else if (am_daemon) {
1673                 itemizing = logfile_format_has_i && do_xfers;
1674                 maybe_ATTRS_REPORT = ATTRS_REPORT;
1675                 code = itemizing || !do_xfers ? FCLIENT : FINFO;
1676         } else if (!am_server) {
1677                 itemizing = stdout_format_has_i;
1678                 maybe_ATTRS_REPORT = stdout_format_has_i ? 0 : ATTRS_REPORT;
1679                 code = itemizing ? FNONE : FINFO;
1680         } else {
1681                 itemizing = 0;
1682                 maybe_ATTRS_REPORT = ATTRS_REPORT;
1683                 code = FINFO;
1684         }
1685         solo_file = local_name != NULL;
1686
1687         if (verbose > 2) {
1688                 rprintf(FINFO, "generator starting pid=%ld count=%d\n",
1689                         (long)getpid(), flist->count);
1690         }
1691
1692         if (delete_before && !local_name && flist->count > 0)
1693                 do_delete_pass(flist);
1694         if (delete_during == 2) {
1695                 deldelay_size = BIGPATHBUFLEN * 4;
1696                 deldelay_buf = new_array(char, deldelay_size);
1697                 if (!deldelay_buf)
1698                         out_of_memory("delete-delay");
1699         }
1700         do_progress = 0;
1701
1702         if (append_mode || whole_file < 0)
1703                 whole_file = 0;
1704         if (verbose >= 2) {
1705                 rprintf(FINFO, "delta-transmission %s\n",
1706                         whole_file
1707                         ? "disabled for local transfer or --whole-file"
1708                         : "enabled");
1709         }
1710
1711         /* Since we often fill up the outgoing socket and then just sit around
1712          * waiting for the other 2 processes to do their thing, we don't want
1713          * to exit on a timeout.  If the data stops flowing, the receiver will
1714          * notice that and let us know via the redo pipe (or its closing). */
1715         ignore_timeout = 1;
1716
1717         for (i = 0; i < flist->count; i++) {
1718                 struct file_struct *file = flist->files[i];
1719
1720                 if (!F_IS_ACTIVE(file))
1721                         continue;
1722
1723                 if (local_name)
1724                         strlcpy(fbuf, local_name, sizeof fbuf);
1725                 else
1726                         f_name(file, fbuf);
1727                 recv_generator(fbuf, file, i, itemizing, code, f_out);
1728
1729                 /* We need to ensure that any dirs we create have writeable
1730                  * permissions during the time we are putting files within
1731                  * them.  This is then fixed after the transfer is done. */
1732 #ifdef HAVE_CHMOD
1733                 if (!am_root && S_ISDIR(file->mode) && !(file->mode & S_IWUSR)
1734                  && dir_tweaking) {
1735                         mode_t mode = file->mode | S_IWUSR; /* user write */
1736                         char *fname = local_name ? local_name : fbuf;
1737                         if (do_chmod(fname, mode) < 0) {
1738                                 rsyserr(FERROR, errno,
1739                                         "failed to modify permissions on %s",
1740                                         full_fname(fname));
1741                         }
1742                         need_retouch_dir_perms = 1;
1743                 }
1744 #endif
1745
1746 #ifdef SUPPORT_HARD_LINKS
1747                 if (preserve_hard_links)
1748                         check_for_finished_hlinks(itemizing, code);
1749 #endif
1750
1751                 if (allowed_lull && !(i % lull_mod))
1752                         maybe_send_keepalive();
1753                 else if (!(i % 200))
1754                         maybe_flush_socket();
1755         }
1756         recv_generator(NULL, NULL, 0, 0, code, -1);
1757         if (delete_during)
1758                 delete_in_dir(NULL, NULL, NULL, NULL);
1759
1760         phase++;
1761         csum_length = SUM_LENGTH;
1762         max_size = min_size = ignore_existing = ignore_non_existing = 0;
1763         update_only = always_checksum = size_only = 0;
1764         ignore_times = 1;
1765         if (append_mode)  /* resend w/o append mode */
1766                 append_mode = -1; /* ... but only longer files */
1767         make_backups = 0; /* avoid a duplicate backup for inplace processing */
1768
1769         if (verbose > 2)
1770                 rprintf(FINFO, "generate_files phase=%d\n", phase);
1771
1772         write_int(f_out, NDX_DONE);
1773
1774         /* files can cycle through the system more than once
1775          * to catch initial checksum errors */
1776         while ((i = get_redo_num(itemizing, code)) != -1) {
1777                 struct file_struct *file = flist->files[i];
1778                 if (local_name)
1779                         strlcpy(fbuf, local_name, sizeof fbuf);
1780                 else
1781                         f_name(file, fbuf);
1782                 recv_generator(fbuf, file, i, itemizing, code, f_out);
1783         }
1784
1785         phase++;
1786         ignore_non_existing = save_ignore_non_existing;
1787         ignore_existing = save_ignore_existing;
1788         make_backups = save_make_backups;
1789
1790         if (verbose > 2)
1791                 rprintf(FINFO, "generate_files phase=%d\n", phase);
1792
1793         write_int(f_out, NDX_DONE);
1794         /* Reduce round-trip lag-time for a useless delay-updates phase. */
1795         if (protocol_version >= 29 && !delay_updates)
1796                 write_int(f_out, NDX_DONE);
1797
1798         /* Read MSG_DONE for the redo phase (and any prior messages). */
1799         get_redo_num(itemizing, code);
1800
1801         if (protocol_version >= 29) {
1802                 phase++;
1803                 if (verbose > 2)
1804                         rprintf(FINFO, "generate_files phase=%d\n", phase);
1805                 if (delay_updates)
1806                         write_int(f_out, NDX_DONE);
1807                 /* Read MSG_DONE for delay-updates phase & prior messages. */
1808                 get_redo_num(itemizing, code);
1809         }
1810
1811         do_progress = save_do_progress;
1812         if (delete_during == 2)
1813                 do_delayed_deletions(fbuf);
1814         if (delete_after && !local_name && flist->count > 0)
1815                 do_delete_pass(flist);
1816
1817         if ((need_retouch_dir_perms || need_retouch_dir_times) && dir_tweaking) {
1818                 int j = 0;
1819                 /* Now we need to fix any directory permissions that were
1820                  * modified during the transfer and/or re-set any tweaked
1821                  * modified-time values. */
1822                 for (i = 0; i < flist->count; i++) {
1823                         struct file_struct *file = flist->files[i];
1824                         if (!F_IS_ACTIVE(file) || !S_ISDIR(file->mode))
1825                                 continue;
1826                         if (!need_retouch_dir_times && file->mode & S_IWUSR)
1827                                 continue;
1828                         if (file->flags & FLAG_MISSING_DIR) {
1829                                 int missing = file->dir.depth;
1830                                 while (++i < flist->count) {
1831                                         file = flist->files[i];
1832                                         if (file->dir.depth <= missing)
1833                                                 break;
1834                                 }
1835                                 i--;
1836                                 continue;
1837                         }
1838                         recv_generator(f_name(file, NULL), file, i, itemizing,
1839                                        code, -1);
1840                         if (allowed_lull && !(++j % lull_mod))
1841                                 maybe_send_keepalive();
1842                         else if (!(j % 200))
1843                                 maybe_flush_socket();
1844                 }
1845         }
1846         recv_generator(NULL, NULL, 0, 0, code, -1);
1847
1848         if (max_delete >= 0 && deletion_count > max_delete) {
1849                 rprintf(FINFO,
1850                         "Deletions stopped due to --max-delete limit (%d skipped)\n",
1851                         deletion_count - max_delete);
1852                 io_error |= IOERR_DEL_LIMIT;
1853         }
1854
1855         if (verbose > 2)
1856                 rprintf(FINFO, "generate_files finished\n");
1857 }