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;
 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             && check_filter(&server_filter_list, fname,
 406                             S_ISDIR(file->mode)) < 0) {
 407                 if (verbose) {
 408                         rprintf(FINFO, "skipping server-excluded file \"%s\"\n",
 409                                 safe_fname(fname));
 410                 }
 411                 return;
 412         }
 413
 414         if (missing_below >= 0 && file->dir.depth <= missing_below) {
 415                 dry_run--;
 416                 missing_below = -1;
 417         }
 418         if (dry_run > 1) {
 419                 statret = -1;
 420                 stat_errno = ENOENT;
 421         } else {
 422                 if (fuzzy_basis && S_ISREG(file->mode)) {
 423                         char *dn = file->dirname ? file->dirname : ".";
 424                         /* Yes, identical dirnames are guaranteed to have
 425                          * identical pointers at this point. */
 426                         if (fuzzy_dirname != dn) {
 427                                 if (fuzzy_dirlist)
 428                                         flist_free(fuzzy_dirlist);
 429                                 fuzzy_dirname = dn;
 430                                 fuzzy_dirlist = get_dirlist(fuzzy_dirname, 1);
 431                         }
 432                 }
 433
 434                 statret = link_stat(fname, &st,
 435                                     keep_dirlinks && S_ISDIR(file->mode));
 436                 stat_errno = errno;
 437         }
 438
 439         if (only_existing && statret == -1 && stat_errno == ENOENT) {
 440                 /* we only want to update existing files */
 441                 if (verbose > 1) {
 442                         rprintf(FINFO, "not creating new file \"%s\"\n",
 443                                 safe_fname(fname));
 444                 }
 445                 return;
 446         }
 447
 448         if (statret == 0 && !preserve_perms
 449             && S_ISDIR(st.st_mode) == S_ISDIR(file->mode)) {
 450                 /* if the file exists already and we aren't perserving
 451                  * permissions then act as though the remote end sent
 452                  * us the file permissions we already have */
 453                 file->mode = (file->mode & ~CHMOD_BITS)
 454                            | (st.st_mode & CHMOD_BITS);
 455         }
 456
 457         if (S_ISDIR(file->mode)) {
 458                 /* The file to be received is a directory, so we need
 459                  * to prepare appropriately.  If there is already a
 460                  * file of that name and it is *not* a directory, then
 461                  * we need to delete it.  If it doesn't exist, then
 462                  * (perhaps recursively) create it. */
 463                 if (statret == 0 && !S_ISDIR(st.st_mode)) {
 464                         delete_file(fname, st.st_mode, maybe_DEL_TERSE);
 465                         statret = -1;
 466                 }
 467                 if (dry_run && statret != 0 && missing_below < 0) {
 468                         missing_below = file->dir.depth;
 469                         dry_run++;
 470                 }
 471                 if (itemizing && f_out != -1)
 472                         itemize(file, statret, &st, 0, f_out, ndx);
 473                 if (statret != 0 && do_mkdir(fname,file->mode) != 0 && errno != EEXIST) {
 474                         if (!relative_paths || errno != ENOENT
 475                             || create_directory_path(fname, orig_umask) < 0
 476                             || do_mkdir(fname, file->mode) < 0) {
 477                                 rsyserr(FERROR, errno,
 478                                         "recv_generator: mkdir %s failed",
 479                                         full_fname(fname));
 480                         }
 481                 }
 482                 if (set_perms(fname, file, statret ? NULL : &st, 0)
 483                     && verbose && code && f_out != -1)
 484                         rprintf(code, "%s/\n", safe_fname(fname));
 485                 if (delete_during && f_out != -1 && csum_length != SUM_LENGTH
 486                     && (file->flags & FLAG_DEL_HERE))
 487                         delete_in_dir(flist, fname, file);
 488                 return;
 489         }
 490
 491         if (max_size && file->length > max_size) {
 492                 if (verbose > 1) {
 493                         rprintf(FINFO, "%s is over max-size\n",
 494                                 safe_fname(fname));
 495                 }
 496                 return;
 497         }
 498
 499         if (preserve_links && S_ISLNK(file->mode)) {
 500 #ifdef SUPPORT_LINKS
 501                 if (safe_symlinks && unsafe_symlink(file->u.link, fname)) {
 502                         if (verbose) {
 503                                 rprintf(FINFO,
 504                                         "ignoring unsafe symlink %s -> \"%s\"\n",
 505                                         full_fname(fname),
 506                                         safe_fname(file->u.link));
 507                         }
 508                         return;
 509                 }
 510                 if (statret == 0) {
 511                         char lnk[MAXPATHLEN];
 512                         int len;
 513
 514                         if (!S_ISDIR(st.st_mode)
 515                             && (len = readlink(fname, lnk, MAXPATHLEN-1)) > 0) {
 516                                 lnk[len] = 0;
 517                                 /* A link already pointing to the
 518                                  * right place -- no further action
 519                                  * required. */
 520                                 if (strcmp(lnk, file->u.link) == 0) {
 521                                         if (itemizing) {
 522                                                 itemize(file, 0, &st, 0,
 523                                                         f_out, ndx);
 524                                         }
 525                                         set_perms(fname, file, &st,
 526                                                   maybe_PERMS_REPORT);
 527                                         return;
 528                                 }
 529                         }
 530                         /* Not the right symlink (or not a symlink), so
 531                          * delete it. */
 532                         if (S_ISLNK(st.st_mode))
 533                                 delete_file(fname, st.st_mode, DEL_TERSE);
 534                         else {
 535                                 delete_file(fname, st.st_mode, maybe_DEL_TERSE);
 536                                 statret = -1;
 537                         }
 538                 }
 539                 if (do_symlink(file->u.link,fname) != 0) {
 540                         rsyserr(FERROR, errno, "symlink %s -> \"%s\" failed",
 541                                 full_fname(fname), safe_fname(file->u.link));
 542                 } else {
 543                         set_perms(fname,file,NULL,0);
 544                         if (itemizing) {
 545                                 itemize(file, statret, &st, SID_UPDATING,
 546                                         f_out, ndx);
 547                         }
 548                         if (code && verbose) {
 549                                 rprintf(code, "%s -> %s\n", safe_fname(fname),
 550                                         safe_fname(file->u.link));
 551                         }
 552                 }
 553 #endif
 554                 return;
 555         }
 556
 557         if (am_root && preserve_devices && IS_DEVICE(file->mode)) {
 558                 if (statret != 0 ||
 559                     st.st_mode != file->mode ||
 560                     st.st_rdev != file->u.rdev) {
 561                         if (IS_DEVICE(st.st_mode))
 562                                 delete_file(fname, st.st_mode, DEL_TERSE);
 563                         else {
 564                                 delete_file(fname, st.st_mode, maybe_DEL_TERSE);
 565                                 statret = -1;
 566                         }
 567                         if (verbose > 2) {
 568                                 rprintf(FINFO,"mknod(%s,0%o,0x%x)\n",
 569                                         safe_fname(fname),
 570                                         (int)file->mode, (int)file->u.rdev);
 571                         }
 572                         if (do_mknod(fname,file->mode,file->u.rdev) != 0) {
 573                                 rsyserr(FERROR, errno, "mknod %s failed",
 574                                         full_fname(fname));
 575                         } else {
 576                                 set_perms(fname,file,NULL,0);
 577                                 if (itemizing) {
 578                                         itemize(file, statret, &st, SID_UPDATING,
 579                                                 f_out, ndx);
 580                                 }
 581                                 if (code && verbose) {
 582                                         rprintf(code, "%s\n",
 583                                                 safe_fname(fname));
 584                                 }
 585                         }
 586                 } else {
 587                         if (itemizing) {
 588                                 itemize(file, statret, &st, 0,
 589                                         f_out, ndx);
 590                         }
 591                         set_perms(fname, file, &st, maybe_PERMS_REPORT);
 592                 }
 593                 return;
 594         }
 595
 596         if (preserve_hard_links && hard_link_check(file, HL_CHECK_MASTER))
 597                 return;
 598
 599         if (!S_ISREG(file->mode)) {
 600                 rprintf(FINFO, "skipping non-regular file \"%s\"\n",
 601                         safe_fname(fname));
 602                 return;
 603         }
 604
 605         fnamecmp = fname;
 606         fnamecmp_type = FNAMECMP_FNAME;
 607
 608         if (statret != 0 && basis_dir[0] != NULL) {
 609                 int fallback_match = -1;
 610                 int match_level = 0;
 611                 int i = 0;
 612                 do {
 613                         pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 614                                  basis_dir[i], fname);
 615                         if (link_stat(fnamecmpbuf, &st, 0) == 0
 616                             && S_ISREG(st.st_mode)) {
 617                                 statret = 0;
 618                                 if (link_dest) {
 619                                         if (!match_level) {
 620                                                 fallback_match = i;
 621                                                 match_level = 1;
 622                                         } else if (match_level == 2
 623                                             && !unchanged_attrs(file, &st))
 624                                                 continue;
 625                                         if (!unchanged_file(fnamecmpbuf, file, &st))
 626                                                 continue;
 627                                         fallback_match = i;
 628                                         match_level = 2;
 629                                         if (!unchanged_attrs(file, &st))
 630                                                 continue;
 631                                 }
 632                                 match_level = 3;
 633                                 break;
 634                         }
 635                 } while (basis_dir[++i] != NULL);
 636                 if (statret == 0) {
 637                         if (match_level < 3) {
 638                                 i = fallback_match;
 639                                 pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 640                                          basis_dir[i], fname);
 641                         }
 642 #ifdef HAVE_LINK
 643                         if (link_dest && match_level == 3 && !dry_run) {
 644                                 if (do_link(fnamecmpbuf, fname) < 0) {
 645                                         if (verbose) {
 646                                                 rsyserr(FINFO, errno,
 647                                                         "link %s => %s",
 648                                                         full_fname(fnamecmpbuf),
 649                                                         safe_fname(fname));
 650                                         }
 651                                         fnamecmp = fnamecmpbuf;
 652                                         fnamecmp_type = i;
 653                                 }
 654                         } else
 655 #endif
 656                         {
 657                                 fnamecmp = fnamecmpbuf;
 658                                 fnamecmp_type = i;
 659                         }
 660                 }
 661         }
 662
 663         if (statret == 0 && !S_ISREG(st.st_mode)) {
 664                 if (delete_file(fname, st.st_mode, maybe_DEL_TERSE) != 0)
 665                         return;
 666                 statret = -1;
 667                 stat_errno = ENOENT;
 668         }
 669
 670         if (partial_dir && (partialptr = partial_dir_fname(fname)) != NULL
 671             && link_stat(partialptr, &partial_st, 0) == 0
 672             && S_ISREG(partial_st.st_mode)) {
 673                 if (statret != 0)
 674                         goto prepare_to_open;
 675         } else
 676                 partialptr = NULL;
 677
 678         if (statret != 0 && fuzzy_basis && dry_run <= 1) {
 679                 int j = find_fuzzy(file, fuzzy_dirlist);
 680                 if (j >= 0) {
 681                         fuzzy_file = fuzzy_dirlist->files[j];
 682                         f_name_to(fuzzy_file, fnamecmpbuf);
 683                         if (verbose > 2) {
 684                                 rprintf(FINFO, "fuzzy basis selected for %s: %s\n",
 685                                         safe_fname(fname), safe_fname(fnamecmpbuf));
 686                         }
 687                         st.st_mode = fuzzy_file->mode;
 688                         st.st_size = fuzzy_file->length;
 689                         st.st_mtime = fuzzy_file->modtime;
 690                         statret = 0;
 691                         fnamecmp = fnamecmpbuf;
 692                         fnamecmp_type = FNAMECMP_FUZZY;
 693                 }
 694         }
 695
 696         if (statret != 0) {
 697                 if (preserve_hard_links && hard_link_check(file, HL_SKIP))
 698                         return;
 699                 if (stat_errno == ENOENT)
 700                         goto notify_others;
 701                 if (verbose > 1) {
 702                         rsyserr(FERROR, stat_errno,
 703                                 "recv_generator: failed to stat %s",
 704                                 full_fname(fname));
 705                 }
 706                 return;
 707         }
 708
 709         if (opt_ignore_existing && fnamecmp_type == FNAMECMP_FNAME) {
 710                 if (verbose > 1)
 711                         rprintf(FINFO, "%s exists\n", safe_fname(fname));
 712                 return;
 713         }
 714
 715         if (update_only && fnamecmp_type == FNAMECMP_FNAME
 716             && cmp_modtime(st.st_mtime, file->modtime) > 0) {
 717                 if (verbose > 1)
 718                         rprintf(FINFO, "%s is newer\n", safe_fname(fname));
 719                 return;
 720         }
 721
 722         if (!compare_dest && fnamecmp_type <= FNAMECMP_BASIS_DIR_HIGH)
 723                 ;
 724         else if (fnamecmp_type == FNAMECMP_FUZZY)
 725                 ;
 726         else if (unchanged_file(fnamecmp, file, &st)) {
 727                 if (itemizing) {
 728                         itemize(file, statret, &st,
 729                                 fnamecmp_type == FNAMECMP_FNAME
 730                                                ? 0 : SID_NO_DEST_AND_NO_UPDATE,
 731                                 f_out, ndx);
 732                 }
 733                 if (fnamecmp_type == FNAMECMP_FNAME)
 734                         set_perms(fname, file, &st, maybe_PERMS_REPORT);
 735                 return;
 736         }
 737
 738 prepare_to_open:
 739         if (partialptr) {
 740                 st = partial_st;
 741                 fnamecmp = partialptr;
 742                 fnamecmp_type = FNAMECMP_PARTIAL_DIR;
 743                 statret = 0;
 744         }
 745
 746         if (dry_run || read_batch)
 747                 goto notify_others;
 748         if (whole_file > 0) {
 749                 if (statret == 0)
 750                         statret = 1;
 751                 goto notify_others;
 752         }
 753
 754         if (fuzzy_basis) {
 755                 int j = flist_find(fuzzy_dirlist, file);
 756                 if (j >= 0) /* don't use changing file as future fuzzy basis */
 757                         fuzzy_dirlist->files[j]->flags |= FLAG_NO_FUZZY;
 758         }
 759
 760         /* open the file */
 761         fd = do_open(fnamecmp, O_RDONLY, 0);
 762
 763         if (fd == -1) {
 764                 rsyserr(FERROR, errno, "failed to open %s, continuing",
 765                         full_fname(fnamecmp));
 766             pretend_missing:
 767                 /* pretend the file didn't exist */
 768                 if (preserve_hard_links && hard_link_check(file, HL_SKIP))
 769                         return;
 770                 statret = -1;
 771                 goto notify_others;
 772         }
 773
 774         if (inplace && make_backups) {
 775                 if (!(backupptr = get_backup_name(fname))) {
 776                         close(fd);
 777                         return;
 778                 }
 779                 if (!(back_file = make_file(fname, NULL, NO_FILTERS))) {
 780                         close(fd);
 781                         goto pretend_missing;
 782                 }
 783                 if (robust_unlink(backupptr) && errno != ENOENT) {
 784                         rsyserr(FERROR, errno, "unlink %s",
 785                                 full_fname(backupptr));
 786                         free(back_file);
 787                         close(fd);
 788                         return;
 789                 }
 790                 if ((f_copy = do_open(backupptr,
 791                     O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0600)) < 0) {
 792                         rsyserr(FERROR, errno, "open %s",
 793                                 full_fname(backupptr));
 794                         free(back_file);
 795                         close(fd);
 796                         return;
 797                 }
 798                 fnamecmp_type = FNAMECMP_BACKUP;
 799         }
 800
 801         if (verbose > 3) {
 802                 rprintf(FINFO, "gen mapped %s of size %.0f\n",
 803                         safe_fname(fnamecmp), (double)st.st_size);
 804         }
 805
 806         if (verbose > 2)
 807                 rprintf(FINFO, "generating and sending sums for %d\n", ndx);
 808
 809 notify_others:
 810         write_int(f_out, ndx);
 811         if (itemizing) {
 812                 itemize(file, statret, &st, SID_UPDATING
 813                         | (always_checksum ? SID_REPORT_CHECKSUM : 0),
 814                         f_out, -1);
 815                 if (inplace && !read_batch)
 816                         write_byte(f_out, fnamecmp_type);
 817         }
 818         if (f_out_name >= 0) {
 819                 write_byte(f_out_name, fnamecmp_type);
 820                 if (fnamecmp_type == FNAMECMP_FUZZY) {
 821                         uchar lenbuf[3], *lb = lenbuf;
 822                         int len = strlen(fuzzy_file->basename);
 823                         if (len > 0x7F) {
 824 #if MAXPATHLEN > 0x7FFF
 825                                 *lb++ = len / 0x10000 + 0x80;
 826                                 *lb++ = len / 0x100;
 827 #else
 828                                 *lb++ = len / 0x100 + 0x80;
 829 #endif
 830                         }
 831                         *lb = len;
 832                         write_buf(f_out_name, lenbuf, lb - lenbuf + 1);
 833                         write_buf(f_out_name, fuzzy_file->basename, len);
 834                 }
 835         }
 836
 837         if (dry_run || read_batch)
 838                 return;
 839
 840         if (statret == 0) {
 841                 generate_and_send_sums(fd, st.st_size, f_out, f_copy);
 842
 843                 if (f_copy >= 0) {
 844                         close(f_copy);
 845                         set_perms(backupptr, back_file, NULL, 0);
 846                         if (verbose > 1) {
 847                                 rprintf(FINFO, "backed up %s to %s\n",
 848                                         safe_fname(fname), safe_fname(backupptr));
 849                         }
 850                         free(back_file);
 851                 }
 852
 853                 close(fd);
 854         } else
 855                 write_sum_head(f_out, NULL);
 856 }
 857
 858
 859 void generate_files(int f_out, struct file_list *flist, char *local_name,
 860                     int f_out_name)
 861 {
 862         int i;
 863         int phase = 0;
 864         char fbuf[MAXPATHLEN];
 865         int need_retouch_dir_times = preserve_times && !omit_dir_times;
 866         int need_retouch_dir_perms = 0;
 867         int save_only_existing = only_existing;
 868         int save_opt_ignore_existing = opt_ignore_existing;
 869
 870         if (verbose > 2) {
 871                 rprintf(FINFO, "generator starting pid=%ld count=%d\n",
 872                         (long)getpid(), flist->count);
 873         }
 874
 875         if (verbose >= 2) {
 876                 rprintf(FINFO,
 877                         whole_file > 0
 878                         ? "delta-transmission disabled for local transfer or --whole-file\n"
 879                         : "delta transmission enabled\n");
 880         }
 881
 882         /* We expect to just sit around now, so don't exit on a timeout.
 883          * If we really get a timeout then the other process should exit. */
 884         io_timeout = 0;
 885
 886         for (i = 0; i < flist->count; i++) {
 887                 struct file_struct *file = flist->files[i];
 888                 struct file_struct copy;
 889
 890                 if (!file->basename)
 891                         continue;
 892
 893                 /* We need to ensure that any dirs we create have writeable
 894                  * permissions during the time we are putting files within
 895                  * them.  This is then fixed after the transfer is done. */
 896                 if (!am_root && S_ISDIR(file->mode) && !(file->mode & S_IWUSR)) {
 897                         copy = *file;
 898                         copy.mode |= S_IWUSR; /* user write */
 899                         file = &copy;
 900                         need_retouch_dir_perms = 1;
 901                 }
 902
 903                 recv_generator(local_name ? local_name : f_name_to(file, fbuf),
 904                                flist, file, i, f_out, f_out_name);
 905         }
 906         recv_generator(NULL, NULL, NULL, 0, -1, -1);
 907         if (delete_during)
 908                 delete_in_dir(NULL, NULL, NULL);
 909
 910         phase++;
 911         csum_length = SUM_LENGTH;
 912         only_existing = max_size = opt_ignore_existing = 0;
 913         update_only = always_checksum = size_only = 0;
 914         ignore_times = 1;
 915
 916         if (verbose > 2)
 917                 rprintf(FINFO,"generate_files phase=%d\n",phase);
 918
 919         write_int(f_out, -1);
 920
 921         /* files can cycle through the system more than once
 922          * to catch initial checksum errors */
 923         while ((i = get_redo_num()) != -1) {
 924                 struct file_struct *file = flist->files[i];
 925                 recv_generator(local_name ? local_name : f_name_to(file, fbuf),
 926                                flist, file, i, f_out, f_out_name);
 927         }
 928
 929         phase++;
 930         only_existing = save_only_existing;
 931         opt_ignore_existing = save_opt_ignore_existing;
 932
 933         if (verbose > 2)
 934                 rprintf(FINFO,"generate_files phase=%d\n",phase);
 935
 936         write_int(f_out, -1);
 937
 938         /* Read post-redo-phase MSG_DONE and any prior messages. */
 939         get_redo_num();
 940
 941         if (preserve_hard_links)
 942                 do_hard_links();
 943
 944         if ((need_retouch_dir_perms || need_retouch_dir_times)
 945             && !list_only && !local_name && !dry_run) {
 946                 /* Now we need to fix any directory permissions that were
 947                  * modified during the transfer and/or re-set any tweaked
 948                  * modified-time values. */
 949                 for (i = 0; i < flist->count; i++) {
 950                         struct file_struct *file = flist->files[i];
 951                         if (!file->basename || !S_ISDIR(file->mode))
 952                                 continue;
 953                         if (!need_retouch_dir_times && file->mode & S_IWUSR)
 954                                 continue;
 955                         recv_generator(local_name ? local_name : f_name(file),
 956                                        flist, file, i, -1, -1);
 957                 }
 958         }
 959         recv_generator(NULL, NULL, NULL, 0, -1, -1);
 960
 961         if (verbose > 2)
 962                 rprintf(FINFO,"generate_files finished\n");
 963 }