generator.c

   1 /* -*- c-file-style: "linux" -*-
   2
   3    rsync -- fast file replication program
   4
   5    Copyright (C) 1996-2000 by Andrew Tridgell
   6    Copyright (C) Paul Mackerras 1996
   7    Copyright (C) 2002 by Martin Pool <mbp@samba.org>
   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
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 #include "rsync.h"
  25
  26 extern int verbose;
  27 extern int dry_run;
  28 extern int log_format_has_i;
  29 extern int log_format_has_o_or_i;
  30 extern int daemon_log_format_has_i;
  31 extern int am_root;
  32 extern int am_server;
  33 extern int am_daemon;
  34 extern int relative_paths;
  35 extern int keep_dirlinks;
  36 extern int preserve_links;
  37 extern int preserve_devices;
  38 extern int preserve_hard_links;
  39 extern int preserve_perms;
  40 extern int preserve_uid;
  41 extern int preserve_gid;
  42 extern int preserve_times;
  43 extern int omit_dir_times;
  44 extern int delete_during;
  45 extern int remove_sent_files;
  46 extern int update_only;
  47 extern int opt_ignore_existing;
  48 extern int inplace;
  49 extern int make_backups;
  50 extern int csum_length;
  51 extern int ignore_times;
  52 extern int size_only;
  53 extern OFF_T max_size;
  54 extern int io_timeout;
  55 extern int ignore_timeout;
  56 extern int protocol_version;
  57 extern int fuzzy_basis;
  58 extern int always_checksum;
  59 extern char *partial_dir;
  60 extern char *basis_dir[];
  61 extern int compare_dest;
  62 extern int link_dest;
  63 extern int whole_file;
  64 extern int local_server;
  65 extern int list_only;
  66 extern int read_batch;
  67 extern int only_existing;
  68 extern int orig_umask;
  69 extern int safe_symlinks;
  70 extern long block_size; /* "long" because popt can't set an int32. */
  71 extern struct stats stats;
  72
  73 extern struct filter_list_struct server_filter_list;
  74
  75 static int unchanged_attrs(struct file_struct *file, STRUCT_STAT *st)
  76 {
  77         if (preserve_perms
  78          && (st->st_mode & CHMOD_BITS) != (file->mode & CHMOD_BITS))
  79                 return 0;
  80
  81         if (am_root && preserve_uid && st->st_uid != file->uid)
  82                 return 0;
  83
  84         if (preserve_gid && file->gid != GID_NONE && st->st_gid != file->gid)
  85                 return 0;
  86
  87         return 1;
  88 }
  89
  90
  91 #define SID_UPDATING              ITEM_UPDATING
  92 #define SID_REPORT_CHECKSUM       ITEM_REPORT_CHECKSUM
  93 #define SID_USING_ALT_BASIS       ITEM_USING_ALT_BASIS
  94 /* This flag doesn't get sent, so it must be outside 0xffff. */
  95 #define SID_NO_DEST_AND_NO_UPDATE (1<<16)
  96
  97 static void itemize(struct file_struct *file, int statret, STRUCT_STAT *st,
  98                     int32 sflags, int f_out, int ndx)
  99 {
 100         int iflags = sflags & 0xffff;
 101
 102         if (statret >= 0) {
 103                 if (S_ISREG(file->mode) && file->length != st->st_size)
 104                         iflags |= ITEM_REPORT_SIZE;
 105                 if (!(sflags & SID_NO_DEST_AND_NO_UPDATE)) {
 106                         int keep_time = !preserve_times ? 0
 107                             : S_ISDIR(file->mode) ? !omit_dir_times
 108                             : !S_ISLNK(file->mode);
 109
 110                         if ((iflags & ITEM_UPDATING && !keep_time)
 111                             || (keep_time && file->modtime != st->st_mtime))
 112                                 iflags |= ITEM_REPORT_TIME;
 113                         if (preserve_perms && file->mode != st->st_mode)
 114                                 iflags |= ITEM_REPORT_PERMS;
 115                         if (preserve_uid && am_root && file->uid != st->st_uid)
 116                                 iflags |= ITEM_REPORT_OWNER;
 117                         if (preserve_gid && file->gid != GID_NONE
 118                             && st->st_gid != file->gid)
 119                                 iflags |= ITEM_REPORT_GROUP;
 120                 }
 121         } else
 122                 iflags |= ITEM_IS_NEW | ITEM_UPDATING;
 123
 124         if ((iflags || verbose > 1) && !read_batch) {
 125                 if (protocol_version >= 29) {
 126                         if (ndx >= 0)
 127                                 write_int(f_out, ndx);
 128                         write_shortint(f_out, iflags);
 129                 } else if (ndx >= 0)
 130                         log_recv(file, &stats, iflags);
 131         }
 132 }
 133
 134
 135 /* Perform our quick-check heuristic for determining if a file is unchanged. */
 136 static int unchanged_file(char *fn, struct file_struct *file, STRUCT_STAT *st)
 137 {
 138         if (st->st_size != file->length)
 139                 return 0;
 140
 141         /* if always checksum is set then we use the checksum instead
 142            of the file time to determine whether to sync */
 143         if (always_checksum && S_ISREG(st->st_mode)) {
 144                 char sum[MD4_SUM_LENGTH];
 145                 file_checksum(fn, sum, st->st_size);
 146                 return memcmp(sum, file->u.sum, protocol_version < 21 ? 2
 147                                                         : MD4_SUM_LENGTH) == 0;
 148         }
 149
 150         if (size_only)
 151                 return 1;
 152
 153         if (ignore_times)
 154                 return 0;
 155
 156         return cmp_modtime(st->st_mtime, file->modtime) == 0;
 157 }
 158
 159
 160 /*
 161  * set (initialize) the size entries in the per-file sum_struct
 162  * calculating dynamic block and checksum sizes.
 163  *
 164  * This is only called from generate_and_send_sums() but is a separate
 165  * function to encapsulate the logic.
 166  *
 167  * The block size is a rounded square root of file length.
 168  *
 169  * The checksum size is determined according to:
 170  *     blocksum_bits = BLOCKSUM_EXP + 2*log2(file_len) - log2(block_len)
 171  * provided by Donovan Baarda which gives a probability of rsync
 172  * algorithm corrupting data and falling back using the whole md4
 173  * checksums.
 174  *
 175  * This might be made one of several selectable heuristics.
 176  */
 177 static void sum_sizes_sqroot(struct sum_struct *sum, int64 len)
 178 {
 179         int32 blength;
 180         int s2length;
 181
 182         if (block_size)
 183                 blength = block_size;
 184         else if (len <= BLOCK_SIZE * BLOCK_SIZE)
 185                 blength = BLOCK_SIZE;
 186         else {
 187                 int32 c;
 188                 int64 l;
 189                 int cnt;
 190                 for (c = 1, l = len, cnt = 0; l >>= 2; c <<= 1, cnt++) {}
 191                 if (cnt >= 31 || c >= MAX_BLOCK_SIZE)
 192                         blength = MAX_BLOCK_SIZE;
 193                 else {
 194                     blength = 0;
 195                     do {
 196                             blength |= c;
 197                             if (len < (int64)blength * blength)
 198                                     blength &= ~c;
 199                             c >>= 1;
 200                     } while (c >= 8);   /* round to multiple of 8 */
 201                     blength = MAX(blength, BLOCK_SIZE);
 202                 }
 203         }
 204
 205         if (protocol_version < 27) {
 206                 s2length = csum_length;
 207         } else if (csum_length == SUM_LENGTH) {
 208                 s2length = SUM_LENGTH;
 209         } else {
 210                 int32 c;
 211                 int64 l;
 212                 int b = BLOCKSUM_BIAS;
 213                 for (l = len; l >>= 1; b += 2) {}
 214                 for (c = blength; c >>= 1 && b; b--) {}
 215                 /* add a bit, subtract rollsum, round up. */
 216                 s2length = (b + 1 - 32 + 7) / 8; /* --optimize in compiler-- */
 217                 s2length = MAX(s2length, csum_length);
 218                 s2length = MIN(s2length, SUM_LENGTH);
 219         }
 220
 221         sum->flength    = len;
 222         sum->blength    = blength;
 223         sum->s2length   = s2length;
 224         sum->count      = (len + (blength - 1)) / blength;
 225         sum->remainder  = (len % blength);
 226
 227         if (sum->count && verbose > 2) {
 228                 rprintf(FINFO,
 229                         "count=%.0f rem=%ld blength=%ld s2length=%d flength=%.0f\n",
 230                         (double)sum->count, (long)sum->remainder, (long)sum->blength,
 231                         sum->s2length, (double)sum->flength);
 232         }
 233 }
 234
 235
 236 /*
 237  * Generate and send a stream of signatures/checksums that describe a buffer
 238  *
 239  * Generate approximately one checksum every block_len bytes.
 240  */
 241 static void generate_and_send_sums(int fd, OFF_T len, int f_out, int f_copy)
 242 {
 243         int32 i;
 244         struct map_struct *mapbuf;
 245         struct sum_struct sum;
 246         OFF_T offset = 0;
 247
 248         sum_sizes_sqroot(&sum, len);
 249
 250         if (len > 0)
 251                 mapbuf = map_file(fd, len, MAX_MAP_SIZE, sum.blength);
 252         else
 253                 mapbuf = NULL;
 254
 255         write_sum_head(f_out, &sum);
 256
 257         for (i = 0; i < sum.count; i++) {
 258                 int32 n1 = (int32)MIN(len, (OFF_T)sum.blength);
 259                 char *map = map_ptr(mapbuf, offset, n1);
 260                 uint32 sum1 = get_checksum1(map, n1);
 261                 char sum2[SUM_LENGTH];
 262
 263                 if (f_copy >= 0)
 264                         full_write(f_copy, map, n1);
 265
 266                 get_checksum2(map, n1, sum2);
 267
 268                 if (verbose > 3) {
 269                         rprintf(FINFO,
 270                                 "chunk[%.0f] offset=%.0f len=%ld sum1=%08lx\n",
 271                                 (double)i, (double)offset, (long)n1,
 272                                 (unsigned long)sum1);
 273                 }
 274                 write_int(f_out, sum1);
 275                 write_buf(f_out, sum2, sum.s2length);
 276                 len -= n1;
 277                 offset += n1;
 278         }
 279
 280         if (mapbuf)
 281                 unmap_file(mapbuf);
 282 }
 283
 284
 285 /* Try to find a filename in the same dir as "fname" with a similar name. */
 286 static int find_fuzzy(struct file_struct *file, struct file_list *dirlist)
 287 {
 288         int fname_len, fname_suf_len;
 289         const char *fname_suf, *fname = file->basename;
 290         uint32 lowest_dist = 0x7FFFFFFF;
 291         int j, lowest_j = -1;
 292
 293         fname_len = strlen(fname);
 294         fname_suf = find_filename_suffix(fname, fname_len, &fname_suf_len);
 295
 296         for (j = 0; j < dirlist->count; j++) {
 297                 struct file_struct *fp = dirlist->files[j];
 298                 const char *suf, *name;
 299                 int len, suf_len;
 300                 uint32 dist;
 301
 302                 if (!S_ISREG(fp->mode) || !fp->length
 303                     || fp->flags & FLAG_NO_FUZZY)
 304                         continue;
 305
 306                 name = fp->basename;
 307
 308                 if (fp->length == file->length
 309                     && fp->modtime == file->modtime) {
 310                         if (verbose > 4) {
 311                                 rprintf(FINFO,
 312                                         "fuzzy size/modtime match for %s\n",
 313                                         name);
 314                         }
 315                         return j;
 316                 }
 317
 318                 len = strlen(name);
 319                 suf = find_filename_suffix(name, len, &suf_len);
 320
 321                 dist = fuzzy_distance(name, len, fname, fname_len);
 322                 /* Add some extra weight to how well the suffixes match. */
 323                 dist += fuzzy_distance(suf, suf_len, fname_suf, fname_suf_len)
 324                       * 10;
 325                 if (verbose > 4) {
 326                         rprintf(FINFO, "fuzzy distance for %s = %d.%05d\n",
 327                                 name, (int)(dist>>16), (int)(dist&0xFFFF));
 328                 }
 329                 if (dist <= lowest_dist) {
 330                         lowest_dist = dist;
 331                         lowest_j = j;
 332                 }
 333         }
 334
 335         return lowest_j;
 336 }
 337
 338
 339 /* Acts on flist->file's ndx'th item, whose name is fname.  If a directory,
 340  * make sure it exists, and has the right permissions/timestamp info.  For
 341  * all other non-regular files (symlinks, etc.) we create them here.  For
 342  * regular files that have changed, we try to find a basis file and then
 343  * start sending checksums.
 344  *
 345  * Note that f_out is set to -1 when doing final directory-permission and
 346  * modification-time repair. */
 347 static void recv_generator(char *fname, struct file_list *flist,
 348                            struct file_struct *file, int ndx,
 349                            int f_out, int f_out_name)
 350 {
 351         static int missing_below = -1, excluded_below = -1;
 352         static char *fuzzy_dirname = NULL;
 353         static struct file_list *fuzzy_dirlist = NULL;
 354         struct file_struct *fuzzy_file = NULL;
 355         int fd = -1, f_copy = -1;
 356         STRUCT_STAT st, partial_st;
 357         struct file_struct *back_file = NULL;
 358         int statret, stat_errno;
 359         char *fnamecmp, *partialptr, *backupptr = NULL;
 360         char fnamecmpbuf[MAXPATHLEN];
 361         int itemizing, maybe_PERMS_REPORT;
 362         uchar fnamecmp_type;
 363         enum logcode code;
 364
 365         if (list_only)
 366                 return;
 367
 368         if (protocol_version >= 29) {
 369                 itemizing = 1;
 370                 code = daemon_log_format_has_i ? 0 : FLOG;
 371                 maybe_PERMS_REPORT = log_format_has_i ? 0 : PERMS_REPORT;
 372         } else if (am_daemon) {
 373                 itemizing = daemon_log_format_has_i && !dry_run;
 374                 code = itemizing || dry_run ? FCLIENT : FINFO;
 375                 maybe_PERMS_REPORT = PERMS_REPORT;
 376         } else if (!am_server) {
 377                 itemizing = log_format_has_i;
 378                 code = itemizing ? 0 : FINFO;
 379                 maybe_PERMS_REPORT = log_format_has_i ? 0 : PERMS_REPORT;
 380         } else {
 381                 itemizing = 0;
 382                 code = FINFO;
 383                 maybe_PERMS_REPORT = PERMS_REPORT;
 384         }
 385
 386         if (!fname) {
 387                 if (fuzzy_dirlist) {
 388                         flist_free(fuzzy_dirlist);
 389                         fuzzy_dirlist = NULL;
 390                         fuzzy_dirname = NULL;
 391                 }
 392                 if (missing_below >= 0) {
 393                         dry_run--;
 394                         missing_below = -1;
 395                 }
 396                 return;
 397         }
 398
 399         if (verbose > 2) {
 400                 rprintf(FINFO, "recv_generator(%s,%d)\n",
 401                         safe_fname(fname), ndx);
 402         }
 403
 404         if (server_filter_list.head) {
 405                 if (excluded_below >= 0) {
 406                         if (file->dir.depth > excluded_below)
 407                                 goto skipping;
 408                         excluded_below = -1;
 409                 }
 410                 if (check_filter(&server_filter_list, fname,
 411                                  S_ISDIR(file->mode)) < 0) {
 412                         if (S_ISDIR(file->mode))
 413                                 excluded_below = file->dir.depth;
 414                     skipping:
 415                         if (verbose) {
 416                                 rprintf(FINFO,
 417                                         "skipping server-excluded file \"%s\"\n",
 418                                         safe_fname(fname));
 419                         }
 420                         return;
 421                 }
 422         }
 423
 424         if (missing_below >= 0 && file->dir.depth <= missing_below) {
 425                 dry_run--;
 426                 missing_below = -1;
 427         }
 428         if (dry_run > 1) {
 429                 statret = -1;
 430                 stat_errno = ENOENT;
 431         } else {
 432                 if (fuzzy_basis && S_ISREG(file->mode)) {
 433                         char *dn = file->dirname ? file->dirname : ".";
 434                         /* Yes, identical dirnames are guaranteed to have
 435                          * identical pointers at this point. */
 436                         if (fuzzy_dirname != dn) {
 437                                 if (fuzzy_dirlist)
 438                                         flist_free(fuzzy_dirlist);
 439                                 fuzzy_dirname = dn;
 440                                 fuzzy_dirlist = get_dirlist(fuzzy_dirname, 1);
 441                         }
 442                 }
 443
 444                 statret = link_stat(fname, &st,
 445                                     keep_dirlinks && S_ISDIR(file->mode));
 446                 stat_errno = errno;
 447         }
 448
 449         if (only_existing && statret == -1 && stat_errno == ENOENT) {
 450                 /* we only want to update existing files */
 451                 if (verbose > 1) {
 452                         rprintf(FINFO, "not creating new file \"%s\"\n",
 453                                 safe_fname(fname));
 454                 }
 455                 return;
 456         }
 457
 458         if (statret == 0 && !preserve_perms
 459             && S_ISDIR(st.st_mode) == S_ISDIR(file->mode)) {
 460                 /* if the file exists already and we aren't perserving
 461                  * permissions then act as though the remote end sent
 462                  * us the file permissions we already have */
 463                 file->mode = (file->mode & ~CHMOD_BITS)
 464                            | (st.st_mode & CHMOD_BITS);
 465         }
 466
 467         if (S_ISDIR(file->mode)) {
 468                 /* The file to be received is a directory, so we need
 469                  * to prepare appropriately.  If there is already a
 470                  * file of that name and it is *not* a directory, then
 471                  * we need to delete it.  If it doesn't exist, then
 472                  * (perhaps recursively) create it. */
 473                 if (statret == 0 && !S_ISDIR(st.st_mode)) {
 474                         delete_file(fname, st.st_mode, DEL_TERSE);
 475                         statret = -1;
 476                 }
 477                 if (dry_run && statret != 0 && missing_below < 0) {
 478                         missing_below = file->dir.depth;
 479                         dry_run++;
 480                 }
 481                 if (itemizing && f_out != -1)
 482                         itemize(file, statret, &st, 0, f_out, ndx);
 483                 if (statret != 0 && do_mkdir(fname,file->mode) != 0 && errno != EEXIST) {
 484                         if (!relative_paths || errno != ENOENT
 485                             || create_directory_path(fname, orig_umask) < 0
 486                             || do_mkdir(fname, file->mode) < 0) {
 487                                 rsyserr(FERROR, errno,
 488                                         "recv_generator: mkdir %s failed",
 489                                         full_fname(fname));
 490                         }
 491                 }
 492                 if (set_perms(fname, file, statret ? NULL : &st, 0)
 493                     && verbose && code && f_out != -1)
 494                         rprintf(code, "%s/\n", safe_fname(fname));
 495                 if (delete_during && f_out != -1 && csum_length != SUM_LENGTH
 496                     && (file->flags & FLAG_DEL_HERE))
 497                         delete_in_dir(flist, fname, file);
 498                 return;
 499         }
 500
 501         if (max_size && file->length > max_size) {
 502                 if (verbose > 1) {
 503                         rprintf(FINFO, "%s is over max-size\n",
 504                                 safe_fname(fname));
 505                 }
 506                 return;
 507         }
 508
 509         if (preserve_links && S_ISLNK(file->mode)) {
 510 #ifdef SUPPORT_LINKS
 511                 if (safe_symlinks && unsafe_symlink(file->u.link, fname)) {
 512                         if (verbose) {
 513                                 rprintf(FINFO,
 514                                         "ignoring unsafe symlink %s -> \"%s\"\n",
 515                                         full_fname(fname),
 516                                         safe_fname(file->u.link));
 517                         }
 518                         return;
 519                 }
 520                 if (statret == 0) {
 521                         char lnk[MAXPATHLEN];
 522                         int len;
 523
 524                         if (!S_ISDIR(st.st_mode)
 525                             && (len = readlink(fname, lnk, MAXPATHLEN-1)) > 0) {
 526                                 lnk[len] = 0;
 527                                 /* A link already pointing to the
 528                                  * right place -- no further action
 529                                  * required. */
 530                                 if (strcmp(lnk, file->u.link) == 0) {
 531                                         if (itemizing) {
 532                                                 itemize(file, 0, &st, 0,
 533                                                         f_out, ndx);
 534                                         }
 535                                         set_perms(fname, file, &st,
 536                                                   maybe_PERMS_REPORT);
 537                                         return;
 538                                 }
 539                         }
 540                         /* Not the right symlink (or not a symlink), so
 541                          * delete it. */
 542                         if (S_ISLNK(st.st_mode))
 543                                 delete_file(fname, st.st_mode, DEL_TERSE);
 544                         else {
 545                                 delete_file(fname, st.st_mode, DEL_TERSE);
 546                                 statret = -1;
 547                         }
 548                 }
 549                 if (do_symlink(file->u.link,fname) != 0) {
 550                         rsyserr(FERROR, errno, "symlink %s -> \"%s\" failed",
 551                                 full_fname(fname), safe_fname(file->u.link));
 552                 } else {
 553                         set_perms(fname,file,NULL,0);
 554                         if (itemizing) {
 555                                 itemize(file, statret, &st, SID_UPDATING,
 556                                         f_out, ndx);
 557                         }
 558                         if (code && verbose) {
 559                                 rprintf(code, "%s -> %s\n", safe_fname(fname),
 560                                         safe_fname(file->u.link));
 561                         }
 562                         if (remove_sent_files && !dry_run) {
 563                                 char numbuf[4];
 564                                 SIVAL(numbuf, 0, ndx);
 565                                 send_msg(MSG_SUCCESS, numbuf, 4);
 566                         }
 567                 }
 568 #endif
 569                 return;
 570         }
 571
 572         if (am_root && preserve_devices && IS_DEVICE(file->mode)) {
 573                 if (statret != 0 ||
 574                     st.st_mode != file->mode ||
 575                     st.st_rdev != file->u.rdev) {
 576                         if (IS_DEVICE(st.st_mode))
 577                                 delete_file(fname, st.st_mode, DEL_TERSE);
 578                         else {
 579                                 delete_file(fname, st.st_mode, DEL_TERSE);
 580                                 statret = -1;
 581                         }
 582                         if (verbose > 2) {
 583                                 rprintf(FINFO,"mknod(%s,0%o,0x%x)\n",
 584                                         safe_fname(fname),
 585                                         (int)file->mode, (int)file->u.rdev);
 586                         }
 587                         if (do_mknod(fname,file->mode,file->u.rdev) != 0) {
 588                                 rsyserr(FERROR, errno, "mknod %s failed",
 589                                         full_fname(fname));
 590                         } else {
 591                                 set_perms(fname,file,NULL,0);
 592                                 if (itemizing) {
 593                                         itemize(file, statret, &st, SID_UPDATING,
 594                                                 f_out, ndx);
 595                                 }
 596                                 if (code && verbose) {
 597                                         rprintf(code, "%s\n",
 598                                                 safe_fname(fname));
 599                                 }
 600                         }
 601                 } else {
 602                         if (itemizing) {
 603                                 itemize(file, statret, &st, 0,
 604                                         f_out, ndx);
 605                         }
 606                         set_perms(fname, file, &st, maybe_PERMS_REPORT);
 607                 }
 608                 return;
 609         }
 610
 611         if (preserve_hard_links && hard_link_check(file, HL_CHECK_MASTER))
 612                 return;
 613
 614         if (!S_ISREG(file->mode)) {
 615                 rprintf(FINFO, "skipping non-regular file \"%s\"\n",
 616                         safe_fname(fname));
 617                 return;
 618         }
 619
 620         fnamecmp = fname;
 621         fnamecmp_type = FNAMECMP_FNAME;
 622
 623         if (statret != 0 && basis_dir[0] != NULL) {
 624                 int fallback_match = -1;
 625                 int match_level = 0;
 626                 int i = 0;
 627                 do {
 628                         pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 629                                  basis_dir[i], fname);
 630                         if (link_stat(fnamecmpbuf, &st, 0) == 0
 631                             && S_ISREG(st.st_mode)) {
 632                                 statret = 0;
 633                                 if (link_dest) {
 634                                         if (!match_level) {
 635                                                 fallback_match = i;
 636                                                 match_level = 1;
 637                                         } else if (match_level == 2
 638                                             && !unchanged_attrs(file, &st))
 639                                                 continue;
 640                                         if (!unchanged_file(fnamecmpbuf, file, &st))
 641                                                 continue;
 642                                         fallback_match = i;
 643                                         match_level = 2;
 644                                         if (!unchanged_attrs(file, &st))
 645                                                 continue;
 646                                 }
 647                                 match_level = 3;
 648                                 break;
 649                         }
 650                 } while (basis_dir[++i] != NULL);
 651                 if (statret == 0) {
 652                         if (match_level < 3) {
 653                                 i = fallback_match;
 654                                 pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 655                                          basis_dir[i], fname);
 656                         }
 657 #ifdef HAVE_LINK
 658                         if (link_dest && match_level == 3 && !dry_run) {
 659                                 if (do_link(fnamecmpbuf, fname) < 0) {
 660                                         if (verbose) {
 661                                                 rsyserr(FINFO, errno,
 662                                                         "link %s => %s",
 663                                                         full_fname(fnamecmpbuf),
 664                                                         safe_fname(fname));
 665                                         }
 666                                         fnamecmp = fnamecmpbuf;
 667                                         fnamecmp_type = i;
 668                                 }
 669                         } else
 670 #endif
 671                         {
 672                                 fnamecmp = fnamecmpbuf;
 673                                 fnamecmp_type = i;
 674                         }
 675                 }
 676         }
 677
 678         if (statret == 0 && !S_ISREG(st.st_mode)) {
 679                 if (delete_file(fname, st.st_mode, DEL_TERSE) != 0)
 680                         return;
 681                 statret = -1;
 682                 stat_errno = ENOENT;
 683         }
 684
 685         if (partial_dir && (partialptr = partial_dir_fname(fname)) != NULL
 686             && link_stat(partialptr, &partial_st, 0) == 0
 687             && S_ISREG(partial_st.st_mode)) {
 688                 if (statret != 0)
 689                         goto prepare_to_open;
 690         } else
 691                 partialptr = NULL;
 692
 693         if (statret != 0 && fuzzy_basis && dry_run <= 1) {
 694                 int j = find_fuzzy(file, fuzzy_dirlist);
 695                 if (j >= 0) {
 696                         fuzzy_file = fuzzy_dirlist->files[j];
 697                         f_name_to(fuzzy_file, fnamecmpbuf);
 698                         if (verbose > 2) {
 699                                 rprintf(FINFO, "fuzzy basis selected for %s: %s\n",
 700                                         safe_fname(fname), safe_fname(fnamecmpbuf));
 701                         }
 702                         st.st_mode = fuzzy_file->mode;
 703                         st.st_size = fuzzy_file->length;
 704                         st.st_mtime = fuzzy_file->modtime;
 705                         statret = 0;
 706                         fnamecmp = fnamecmpbuf;
 707                         fnamecmp_type = FNAMECMP_FUZZY;
 708                 }
 709         }
 710
 711         if (statret != 0) {
 712                 if (preserve_hard_links && hard_link_check(file, HL_SKIP))
 713                         return;
 714                 if (stat_errno == ENOENT)
 715                         goto notify_others;
 716                 if (verbose > 1) {
 717                         rsyserr(FERROR, stat_errno,
 718                                 "recv_generator: failed to stat %s",
 719                                 full_fname(fname));
 720                 }
 721                 return;
 722         }
 723
 724         if (opt_ignore_existing && fnamecmp_type == FNAMECMP_FNAME) {
 725                 if (verbose > 1)
 726                         rprintf(FINFO, "%s exists\n", safe_fname(fname));
 727                 return;
 728         }
 729
 730         if (update_only && fnamecmp_type == FNAMECMP_FNAME
 731             && cmp_modtime(st.st_mtime, file->modtime) > 0) {
 732                 if (verbose > 1)
 733                         rprintf(FINFO, "%s is newer\n", safe_fname(fname));
 734                 return;
 735         }
 736
 737         if (!compare_dest && fnamecmp_type <= FNAMECMP_BASIS_DIR_HIGH)
 738                 ;
 739         else if (fnamecmp_type == FNAMECMP_FUZZY)
 740                 ;
 741         else if (unchanged_file(fnamecmp, file, &st)) {
 742                 if (itemizing) {
 743                         itemize(file, statret, &st,
 744                                 fnamecmp_type == FNAMECMP_FNAME
 745                                                ? 0 : SID_NO_DEST_AND_NO_UPDATE,
 746                                 f_out, ndx);
 747                 }
 748                 if (fnamecmp_type == FNAMECMP_FNAME)
 749                         set_perms(fname, file, &st, maybe_PERMS_REPORT);
 750                 return;
 751         }
 752
 753 prepare_to_open:
 754         if (partialptr) {
 755                 st = partial_st;
 756                 fnamecmp = partialptr;
 757                 fnamecmp_type = FNAMECMP_PARTIAL_DIR;
 758                 statret = 0;
 759         }
 760
 761         if (dry_run || read_batch)
 762                 goto notify_others;
 763         if (whole_file > 0) {
 764                 if (statret == 0)
 765                         statret = 1;
 766                 goto notify_others;
 767         }
 768
 769         if (fuzzy_basis) {
 770                 int j = flist_find(fuzzy_dirlist, file);
 771                 if (j >= 0) /* don't use changing file as future fuzzy basis */
 772                         fuzzy_dirlist->files[j]->flags |= FLAG_NO_FUZZY;
 773         }
 774
 775         /* open the file */
 776         fd = do_open(fnamecmp, O_RDONLY, 0);
 777
 778         if (fd == -1) {
 779                 rsyserr(FERROR, errno, "failed to open %s, continuing",
 780                         full_fname(fnamecmp));
 781             pretend_missing:
 782                 /* pretend the file didn't exist */
 783                 if (preserve_hard_links && hard_link_check(file, HL_SKIP))
 784                         return;
 785                 statret = -1;
 786                 goto notify_others;
 787         }
 788
 789         if (inplace && make_backups) {
 790                 if (!(backupptr = get_backup_name(fname))) {
 791                         close(fd);
 792                         return;
 793                 }
 794                 if (!(back_file = make_file(fname, NULL, NO_FILTERS))) {
 795                         close(fd);
 796                         goto pretend_missing;
 797                 }
 798                 if (robust_unlink(backupptr) && errno != ENOENT) {
 799                         rsyserr(FERROR, errno, "unlink %s",
 800                                 full_fname(backupptr));
 801                         free(back_file);
 802                         close(fd);
 803                         return;
 804                 }
 805                 if ((f_copy = do_open(backupptr,
 806                     O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0600)) < 0) {
 807                         rsyserr(FERROR, errno, "open %s",
 808                                 full_fname(backupptr));
 809                         free(back_file);
 810                         close(fd);
 811                         return;
 812                 }
 813                 fnamecmp_type = FNAMECMP_BACKUP;
 814         }
 815
 816         if (verbose > 3) {
 817                 rprintf(FINFO, "gen mapped %s of size %.0f\n",
 818                         safe_fname(fnamecmp), (double)st.st_size);
 819         }
 820
 821         if (verbose > 2)
 822                 rprintf(FINFO, "generating and sending sums for %d\n", ndx);
 823
 824 notify_others:
 825         write_int(f_out, ndx);
 826         if (itemizing) {
 827                 int iflags = SID_UPDATING;
 828                 if (always_checksum)
 829                         iflags |= SID_REPORT_CHECKSUM;
 830                 if (fnamecmp_type != FNAMECMP_FNAME)
 831                         iflags |= SID_USING_ALT_BASIS;
 832                 itemize(file, statret, &st, iflags, f_out, -1);
 833         }
 834         if (f_out_name >= 0) {
 835                 write_byte(f_out_name, fnamecmp_type);
 836                 if (fnamecmp_type == FNAMECMP_FUZZY) {
 837                         uchar lenbuf[3], *lb = lenbuf;
 838                         int len = strlen(fuzzy_file->basename);
 839                         if (len > 0x7F) {
 840 #if MAXPATHLEN > 0x7FFF
 841                                 *lb++ = len / 0x10000 + 0x80;
 842                                 *lb++ = len / 0x100;
 843 #else
 844                                 *lb++ = len / 0x100 + 0x80;
 845 #endif
 846                         }
 847                         *lb = len;
 848                         write_buf(f_out_name, (char*)lenbuf, lb - lenbuf + 1);
 849                         write_buf(f_out_name, fuzzy_file->basename, len);
 850                 }
 851         }
 852
 853         if (dry_run || read_batch)
 854                 return;
 855
 856         if (statret == 0) {
 857                 generate_and_send_sums(fd, st.st_size, f_out, f_copy);
 858
 859                 if (f_copy >= 0) {
 860                         close(f_copy);
 861                         set_perms(backupptr, back_file, NULL, 0);
 862                         if (verbose > 1) {
 863                                 rprintf(FINFO, "backed up %s to %s\n",
 864                                         safe_fname(fname), safe_fname(backupptr));
 865                         }
 866                         free(back_file);
 867                 }
 868
 869                 close(fd);
 870         } else
 871                 write_sum_head(f_out, NULL);
 872 }
 873
 874
 875 void generate_files(int f_out, struct file_list *flist, char *local_name,
 876                     int f_out_name)
 877 {
 878         int i;
 879         int phase = 0;
 880         char fbuf[MAXPATHLEN];
 881         int need_retouch_dir_times = preserve_times && !omit_dir_times;
 882         int need_retouch_dir_perms = 0;
 883         int save_only_existing = only_existing;
 884         int save_opt_ignore_existing = opt_ignore_existing;
 885         int allowed_lull = protocol_version >= 29 ? io_timeout / 2 : 0;
 886
 887         if (verbose > 2) {
 888                 rprintf(FINFO, "generator starting pid=%ld count=%d\n",
 889                         (long)getpid(), flist->count);
 890         }
 891
 892         if (verbose >= 2) {
 893                 rprintf(FINFO, "delta-transmission %s\n",
 894                         whole_file > 0
 895                         ? "disabled for local transfer or --whole-file"
 896                         : "enabled");
 897         }
 898
 899         if (protocol_version < 29)
 900                 io_timeout = 0; /* kluge for older protocol versions */
 901
 902         for (i = 0; i < flist->count; i++) {
 903                 struct file_struct *file = flist->files[i];
 904                 struct file_struct copy;
 905
 906                 if (!file->basename)
 907                         continue;
 908
 909                 /* We need to ensure that any dirs we create have writeable
 910                  * permissions during the time we are putting files within
 911                  * them.  This is then fixed after the transfer is done. */
 912                 if (!am_root && S_ISDIR(file->mode) && !(file->mode & S_IWUSR)) {
 913                         copy = *file;
 914                         copy.mode |= S_IWUSR; /* user write */
 915                         file = &copy;
 916                         need_retouch_dir_perms = 1;
 917                 }
 918
 919                 recv_generator(local_name ? local_name : f_name_to(file, fbuf),
 920                                flist, file, i, f_out, f_out_name);
 921
 922                 if (allowed_lull && !(i % 100))
 923                         maybe_send_keepalive(allowed_lull, flist->count);
 924         }
 925         recv_generator(NULL, NULL, NULL, 0, -1, -1);
 926         if (delete_during)
 927                 delete_in_dir(NULL, NULL, NULL);
 928
 929         phase++;
 930         csum_length = SUM_LENGTH;
 931         only_existing = max_size = opt_ignore_existing = 0;
 932         update_only = always_checksum = size_only = 0;
 933         ignore_times = 1;
 934
 935         /* We expect to just sit around now, so don't exit on a timeout.
 936          * If we really get a timeout then the other process should exit. */
 937         ignore_timeout = 1;
 938
 939         if (verbose > 2)
 940                 rprintf(FINFO,"generate_files phase=%d\n",phase);
 941
 942         write_int(f_out, -1);
 943
 944         /* files can cycle through the system more than once
 945          * to catch initial checksum errors */
 946         while ((i = get_redo_num()) != -1) {
 947                 struct file_struct *file = flist->files[i];
 948                 recv_generator(local_name ? local_name : f_name_to(file, fbuf),
 949                                flist, file, i, f_out, f_out_name);
 950                 if (allowed_lull)
 951                         maybe_send_keepalive(allowed_lull, flist->count);
 952         }
 953
 954         phase++;
 955         only_existing = save_only_existing;
 956         opt_ignore_existing = save_opt_ignore_existing;
 957
 958         if (verbose > 2)
 959                 rprintf(FINFO,"generate_files phase=%d\n",phase);
 960
 961         write_int(f_out, -1);
 962
 963         /* Read post-redo-phase MSG_DONE and any prior messages. */
 964         get_redo_num();
 965
 966         if (preserve_hard_links)
 967                 do_hard_links();
 968
 969         if ((need_retouch_dir_perms || need_retouch_dir_times)
 970             && !list_only && !local_name && !dry_run) {
 971                 /* Now we need to fix any directory permissions that were
 972                  * modified during the transfer and/or re-set any tweaked
 973                  * modified-time values. */
 974                 for (i = 0; i < flist->count; i++) {
 975                         struct file_struct *file = flist->files[i];
 976                         if (!file->basename || !S_ISDIR(file->mode))
 977                                 continue;
 978                         if (!need_retouch_dir_times && file->mode & S_IWUSR)
 979                                 continue;
 980                         recv_generator(local_name ? local_name : f_name(file),
 981                                        flist, file, i, -1, -1);
 982                 }
 983         }
 984         recv_generator(NULL, NULL, NULL, 0, -1, -1);
 985
 986         if (verbose > 2)
 987                 rprintf(FINFO,"generate_files finished\n");
 988 }