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