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