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