generator.c

   1 /* -*- c-file-style: "linux" -*-
   2
   3    rsync -- fast file replication program
   4
   5    Copyright (C) 1996-2000 by Andrew Tridgell
   6    Copyright (C) Paul Mackerras 1996
   7    Copyright (C) 2002 by Martin Pool <mbp@samba.org>
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 #include "rsync.h"
  25
  26 extern int verbose;
  27 extern int dry_run;
  28 extern int log_format_has_i;
  29 extern int log_format_has_o_or_i;
  30 extern int daemon_log_format_has_i;
  31 extern int am_root;
  32 extern int am_server;
  33 extern int am_daemon;
  34 extern int relative_paths;
  35 extern int keep_dirlinks;
  36 extern int preserve_links;
  37 extern int preserve_devices;
  38 extern int preserve_hard_links;
  39 extern int preserve_perms;
  40 extern int preserve_uid;
  41 extern int preserve_gid;
  42 extern int preserve_times;
  43 extern int omit_dir_times;
  44 extern int delete_during;
  45 extern int remove_sent_files;
  46 extern int update_only;
  47 extern int opt_ignore_existing;
  48 extern int inplace;
  49 extern int make_backups;
  50 extern int csum_length;
  51 extern int ignore_times;
  52 extern int size_only;
  53 extern OFF_T max_size;
  54 extern int io_timeout;
  55 extern int protocol_version;
  56 extern int fuzzy_basis;
  57 extern int always_checksum;
  58 extern char *partial_dir;
  59 extern char *basis_dir[];
  60 extern int compare_dest;
  61 extern int link_dest;
  62 extern int whole_file;
  63 extern int local_server;
  64 extern int list_only;
  65 extern int read_batch;
  66 extern int only_existing;
  67 extern int orig_umask;
  68 extern int safe_symlinks;
  69 extern long block_size; /* "long" because popt can't set an int32. */
  70 extern struct stats stats;
  71
  72 extern struct filter_list_struct server_filter_list;
  73
  74 static int unchanged_attrs(struct file_struct *file, STRUCT_STAT *st)
  75 {
  76         if (preserve_perms
  77          && (st->st_mode & CHMOD_BITS) != (file->mode & CHMOD_BITS))
  78                 return 0;
  79
  80         if (am_root && preserve_uid && st->st_uid != file->uid)
  81                 return 0;
  82
  83         if (preserve_gid && file->gid != GID_NONE && st->st_gid != file->gid)
  84                 return 0;
  85
  86         return 1;
  87 }
  88
  89
  90 #define SID_UPDATING              ITEM_UPDATING
  91 #define SID_REPORT_CHECKSUM       ITEM_REPORT_CHECKSUM
  92 #define SID_NO_DEST_AND_NO_UPDATE (1<<16)
  93
  94 static void itemize(struct file_struct *file, int statret, STRUCT_STAT *st,
  95                     int32 sflags, int f_out, int ndx)
  96 {
  97         int iflags = sflags & (SID_UPDATING | SID_REPORT_CHECKSUM);
  98
  99         if (statret >= 0) {
 100                 if (S_ISREG(file->mode) && file->length != st->st_size)
 101                         iflags |= ITEM_REPORT_SIZE;
 102                 if (!(sflags & SID_NO_DEST_AND_NO_UPDATE)) {
 103                         int keep_time = !preserve_times ? 0
 104                             : S_ISDIR(file->mode) ? !omit_dir_times
 105                             : !S_ISLNK(file->mode);
 106
 107                         if ((iflags & ITEM_UPDATING && !keep_time)
 108                             || (keep_time && file->modtime != st->st_mtime))
 109                                 iflags |= ITEM_REPORT_TIME;
 110                         if (preserve_perms && file->mode != st->st_mode)
 111                                 iflags |= ITEM_REPORT_PERMS;
 112                         if (preserve_uid && am_root && file->uid != st->st_uid)
 113                                 iflags |= ITEM_REPORT_OWNER;
 114                         if (preserve_gid && file->gid != GID_NONE
 115                             && st->st_gid != file->gid)
 116                                 iflags |= ITEM_REPORT_GROUP;
 117                 }
 118         } else
 119                 iflags |= ITEM_IS_NEW | ITEM_UPDATING;
 120
 121         if ((iflags || verbose > 1) && !read_batch) {
 122                 if (protocol_version >= 29) {
 123                         if (ndx >= 0)
 124                                 write_int(f_out, ndx);
 125                         write_shortint(f_out, iflags);
 126                 } else if (ndx >= 0)
 127                         log_recv(file, &stats, iflags);
 128         }
 129 }
 130
 131
 132 /* Perform our quick-check heuristic for determining if a file is unchanged. */
 133 static int unchanged_file(char *fn, struct file_struct *file, STRUCT_STAT *st)
 134 {
 135         if (st->st_size != file->length)
 136                 return 0;
 137
 138         /* if always checksum is set then we use the checksum instead
 139            of the file time to determine whether to sync */
 140         if (always_checksum && S_ISREG(st->st_mode)) {
 141                 char sum[MD4_SUM_LENGTH];
 142                 file_checksum(fn, sum, st->st_size);
 143                 return memcmp(sum, file->u.sum, protocol_version < 21 ? 2
 144                                                         : MD4_SUM_LENGTH) == 0;
 145         }
 146
 147         if (size_only)
 148                 return 1;
 149
 150         if (ignore_times)
 151                 return 0;
 152
 153         return cmp_modtime(st->st_mtime, file->modtime) == 0;
 154 }
 155
 156
 157 /*
 158  * set (initialize) the size entries in the per-file sum_struct
 159  * calculating dynamic block and checksum sizes.
 160  *
 161  * This is only called from generate_and_send_sums() but is a separate
 162  * function to encapsulate the logic.
 163  *
 164  * The block size is a rounded square root of file length.
 165  *
 166  * The checksum size is determined according to:
 167  *     blocksum_bits = BLOCKSUM_EXP + 2*log2(file_len) - log2(block_len)
 168  * provided by Donovan Baarda which gives a probability of rsync
 169  * algorithm corrupting data and falling back using the whole md4
 170  * checksums.
 171  *
 172  * This might be made one of several selectable heuristics.
 173  */
 174 static void sum_sizes_sqroot(struct sum_struct *sum, int64 len)
 175 {
 176         int32 blength;
 177         int s2length;
 178
 179         if (block_size)
 180                 blength = block_size;
 181         else if (len <= BLOCK_SIZE * BLOCK_SIZE)
 182                 blength = BLOCK_SIZE;
 183         else {
 184                 int32 c;
 185                 int64 l;
 186                 int cnt;
 187                 for (c = 1, l = len, cnt = 0; l >>= 2; c <<= 1, cnt++) {}
 188                 if (cnt >= 31 || c >= MAX_BLOCK_SIZE)
 189                         blength = MAX_BLOCK_SIZE;
 190                 else {
 191                     blength = 0;
 192                     do {
 193                             blength |= c;
 194                             if (len < (int64)blength * blength)
 195                                     blength &= ~c;
 196                             c >>= 1;
 197                     } while (c >= 8);   /* round to multiple of 8 */
 198                     blength = MAX(blength, BLOCK_SIZE);
 199                 }
 200         }
 201
 202         if (protocol_version < 27) {
 203                 s2length = csum_length;
 204         } else if (csum_length == SUM_LENGTH) {
 205                 s2length = SUM_LENGTH;
 206         } else {
 207                 int32 c;
 208                 int64 l;
 209                 int b = BLOCKSUM_BIAS;
 210                 for (l = len; l >>= 1; b += 2) {}
 211                 for (c = blength; c >>= 1 && b; b--) {}
 212                 /* add a bit, subtract rollsum, round up. */
 213                 s2length = (b + 1 - 32 + 7) / 8; /* --optimize in compiler-- */
 214                 s2length = MAX(s2length, csum_length);
 215                 s2length = MIN(s2length, SUM_LENGTH);
 216         }
 217
 218         sum->flength    = len;
 219         sum->blength    = blength;
 220         sum->s2length   = s2length;
 221         sum->count      = (len + (blength - 1)) / blength;
 222         sum->remainder  = (len % blength);
 223
 224         if (sum->count && verbose > 2) {
 225                 rprintf(FINFO,
 226                         "count=%.0f rem=%ld blength=%ld s2length=%d flength=%.0f\n",
 227                         (double)sum->count, (long)sum->remainder, (long)sum->blength,
 228                         sum->s2length, (double)sum->flength);
 229         }
 230 }
 231
 232
 233 /*
 234  * Generate and send a stream of signatures/checksums that describe a buffer
 235  *
 236  * Generate approximately one checksum every block_len bytes.
 237  */
 238 static void generate_and_send_sums(int fd, OFF_T len, int f_out, int f_copy)
 239 {
 240         int32 i;
 241         struct map_struct *mapbuf;
 242         struct sum_struct sum;
 243         OFF_T offset = 0;
 244
 245         sum_sizes_sqroot(&sum, len);
 246
 247         if (len > 0)
 248                 mapbuf = map_file(fd, len, MAX_MAP_SIZE, sum.blength);
 249         else
 250                 mapbuf = NULL;
 251
 252         write_sum_head(f_out, &sum);
 253
 254         for (i = 0; i < sum.count; i++) {
 255                 int32 n1 = (int32)MIN(len, (OFF_T)sum.blength);
 256                 char *map = map_ptr(mapbuf, offset, n1);
 257                 uint32 sum1 = get_checksum1(map, n1);
 258                 char sum2[SUM_LENGTH];
 259
 260                 if (f_copy >= 0)
 261                         full_write(f_copy, map, n1);
 262
 263                 get_checksum2(map, n1, sum2);
 264
 265                 if (verbose > 3) {
 266                         rprintf(FINFO,
 267                                 "chunk[%.0f] offset=%.0f len=%ld sum1=%08lx\n",
 268                                 (double)i, (double)offset, (long)n1,
 269                                 (unsigned long)sum1);
 270                 }
 271                 write_int(f_out, sum1);
 272                 write_buf(f_out, sum2, sum.s2length);
 273                 len -= n1;
 274                 offset += n1;
 275         }
 276
 277         if (mapbuf)
 278                 unmap_file(mapbuf);
 279 }
 280
 281
 282 /* Try to find a filename in the same dir as "fname" with a similar name. */
 283 static int find_fuzzy(struct file_struct *file, struct file_list *dirlist)
 284 {
 285         int fname_len, fname_suf_len;
 286         const char *fname_suf, *fname = file->basename;
 287         uint32 lowest_dist = 0x7FFFFFFF;
 288         int j, lowest_j = -1;
 289
 290         fname_len = strlen(fname);
 291         fname_suf = find_filename_suffix(fname, fname_len, &fname_suf_len);
 292
 293         for (j = 0; j < dirlist->count; j++) {
 294                 struct file_struct *fp = dirlist->files[j];
 295                 const char *suf, *name;
 296                 int len, suf_len;
 297                 uint32 dist;
 298
 299                 if (!S_ISREG(fp->mode) || !fp->length
 300                     || fp->flags & FLAG_NO_FUZZY)
 301                         continue;
 302
 303                 name = fp->basename;
 304
 305                 if (fp->length == file->length
 306                     && fp->modtime == file->modtime) {
 307                         if (verbose > 4) {
 308                                 rprintf(FINFO,
 309                                         "fuzzy size/modtime match for %s\n",
 310                                         name);
 311                         }
 312                         return j;
 313                 }
 314
 315                 len = strlen(name);
 316                 suf = find_filename_suffix(name, len, &suf_len);
 317
 318                 dist = fuzzy_distance(name, len, fname, fname_len);
 319                 /* Add some extra weight to how well the suffixes match. */
 320                 dist += fuzzy_distance(suf, suf_len, fname_suf, fname_suf_len)
 321                       * 10;
 322                 if (verbose > 4) {
 323                         rprintf(FINFO, "fuzzy distance for %s = %d.%05d\n",
 324                                 name, (int)(dist>>16), (int)(dist&0xFFFF));
 325                 }
 326                 if (dist <= lowest_dist) {
 327                         lowest_dist = dist;
 328                         lowest_j = j;
 329                 }
 330         }
 331
 332         return lowest_j;
 333 }
 334
 335
 336 /* Acts on flist->file's ndx'th item, whose name is fname.  If a directory,
 337  * make sure it exists, and has the right permissions/timestamp info.  For
 338  * all other non-regular files (symlinks, etc.) we create them here.  For
 339  * regular files that have changed, we try to find a basis file and then
 340  * start sending checksums.
 341  *
 342  * Note that f_out is set to -1 when doing final directory-permission and
 343  * modification-time repair. */
 344 static void recv_generator(char *fname, struct file_list *flist,
 345                            struct file_struct *file, int ndx,
 346                            int f_out, int f_out_name)
 347 {
 348         static int missing_below = -1, excluded_below = -1;
 349         static char *fuzzy_dirname = NULL;
 350         static struct file_list *fuzzy_dirlist = NULL;
 351         struct file_struct *fuzzy_file = NULL;
 352         int fd = -1, f_copy = -1;
 353         STRUCT_STAT st, partial_st;
 354         struct file_struct *back_file = NULL;
 355         int statret, stat_errno;
 356         char *fnamecmp, *partialptr, *backupptr = NULL;
 357         char fnamecmpbuf[MAXPATHLEN];
 358         int itemizing, maybe_PERMS_REPORT;
 359         uchar fnamecmp_type;
 360         enum logcode code;
 361
 362         if (list_only)
 363                 return;
 364
 365         if (protocol_version >= 29) {
 366                 itemizing = 1;
 367                 code = daemon_log_format_has_i ? 0 : FLOG;
 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_PERMS_REPORT = PERMS_REPORT;
 373         } else if (!am_server) {
 374                 itemizing = log_format_has_i;
 375                 code = itemizing ? 0 : FINFO;
 376                 maybe_PERMS_REPORT = log_format_has_i ? 0 : PERMS_REPORT;
 377         } else {
 378                 itemizing = 0;
 379                 code = FINFO;
 380                 maybe_PERMS_REPORT = PERMS_REPORT;
 381         }
 382
 383         if (!fname) {
 384                 if (fuzzy_dirlist) {
 385                         flist_free(fuzzy_dirlist);
 386                         fuzzy_dirlist = NULL;
 387                         fuzzy_dirname = NULL;
 388                 }
 389                 if (missing_below >= 0) {
 390                         dry_run--;
 391                         missing_below = -1;
 392                 }
 393                 return;
 394         }
 395
 396         if (verbose > 2) {
 397                 rprintf(FINFO, "recv_generator(%s,%d)\n",
 398                         safe_fname(fname), ndx);
 399         }
 400
 401         if (server_filter_list.head) {
 402                 if (excluded_below >= 0) {
 403                         if (file->dir.depth > excluded_below)
 404                                 goto skipping;
 405                         excluded_below = -1;
 406                 }
 407                 if (check_filter(&server_filter_list, fname,
 408                                  S_ISDIR(file->mode)) < 0) {
 409                         if (S_ISDIR(file->mode))
 410                                 excluded_below = file->dir.depth;
 411                     skipping:
 412                         if (verbose) {
 413                                 rprintf(FINFO,
 414                                         "skipping server-excluded file \"%s\"\n",
 415                                         safe_fname(fname));
 416                         }
 417                         return;
 418                 }
 419         }
 420
 421         if (missing_below >= 0 && file->dir.depth <= missing_below) {
 422                 dry_run--;
 423                 missing_below = -1;
 424         }
 425         if (dry_run > 1) {
 426                 statret = -1;
 427                 stat_errno = ENOENT;
 428         } else {
 429                 if (fuzzy_basis && S_ISREG(file->mode)) {
 430                         char *dn = file->dirname ? file->dirname : ".";
 431                         /* Yes, identical dirnames are guaranteed to have
 432                          * identical pointers at this point. */
 433                         if (fuzzy_dirname != dn) {
 434                                 if (fuzzy_dirlist)
 435                                         flist_free(fuzzy_dirlist);
 436                                 fuzzy_dirname = dn;
 437                                 fuzzy_dirlist = get_dirlist(fuzzy_dirname, 1);
 438                         }
 439                 }
 440
 441                 statret = link_stat(fname, &st,
 442                                     keep_dirlinks && S_ISDIR(file->mode));
 443                 stat_errno = errno;
 444         }
 445
 446         if (only_existing && statret == -1 && stat_errno == ENOENT) {
 447                 /* we only want to update existing files */
 448                 if (verbose > 1) {
 449                         rprintf(FINFO, "not creating new file \"%s\"\n",
 450                                 safe_fname(fname));
 451                 }
 452                 return;
 453         }
 454
 455         if (statret == 0 && !preserve_perms
 456             && S_ISDIR(st.st_mode) == S_ISDIR(file->mode)) {
 457                 /* if the file exists already and we aren't perserving
 458                  * permissions then act as though the remote end sent
 459                  * us the file permissions we already have */
 460                 file->mode = (file->mode & ~CHMOD_BITS)
 461                            | (st.st_mode & CHMOD_BITS);
 462         }
 463
 464         if (S_ISDIR(file->mode)) {
 465                 /* The file to be received is a directory, so we need
 466                  * to prepare appropriately.  If there is already a
 467                  * file of that name and it is *not* a directory, then
 468                  * we need to delete it.  If it doesn't exist, then
 469                  * (perhaps recursively) create it. */
 470                 if (statret == 0 && !S_ISDIR(st.st_mode)) {
 471                         delete_file(fname, st.st_mode, DEL_TERSE);
 472                         statret = -1;
 473                 }
 474                 if (dry_run && statret != 0 && missing_below < 0) {
 475                         missing_below = file->dir.depth;
 476                         dry_run++;
 477                 }
 478                 if (itemizing && f_out != -1)
 479                         itemize(file, statret, &st, 0, f_out, ndx);
 480                 if (statret != 0 && do_mkdir(fname,file->mode) != 0 && errno != EEXIST) {
 481                         if (!relative_paths || errno != ENOENT
 482                             || create_directory_path(fname, orig_umask) < 0
 483                             || do_mkdir(fname, file->mode) < 0) {
 484                                 rsyserr(FERROR, errno,
 485                                         "recv_generator: mkdir %s failed",
 486                                         full_fname(fname));
 487                         }
 488                 }
 489                 if (set_perms(fname, file, statret ? NULL : &st, 0)
 490                     && verbose && code && f_out != -1)
 491                         rprintf(code, "%s/\n", safe_fname(fname));
 492                 if (delete_during && f_out != -1 && csum_length != SUM_LENGTH
 493                     && (file->flags & FLAG_DEL_HERE))
 494                         delete_in_dir(flist, fname, file);
 495                 return;
 496         }
 497
 498         if (max_size && file->length > max_size) {
 499                 if (verbose > 1) {
 500                         rprintf(FINFO, "%s is over max-size\n",
 501                                 safe_fname(fname));
 502                 }
 503                 return;
 504         }
 505
 506         if (preserve_links && S_ISLNK(file->mode)) {
 507 #ifdef SUPPORT_LINKS
 508                 if (safe_symlinks && unsafe_symlink(file->u.link, fname)) {
 509                         if (verbose) {
 510                                 rprintf(FINFO,
 511                                         "ignoring unsafe symlink %s -> \"%s\"\n",
 512                                         full_fname(fname),
 513                                         safe_fname(file->u.link));
 514                         }
 515                         return;
 516                 }
 517                 if (statret == 0) {
 518                         char lnk[MAXPATHLEN];
 519                         int len;
 520
 521                         if (!S_ISDIR(st.st_mode)
 522                             && (len = readlink(fname, lnk, MAXPATHLEN-1)) > 0) {
 523                                 lnk[len] = 0;
 524                                 /* A link already pointing to the
 525                                  * right place -- no further action
 526                                  * required. */
 527                                 if (strcmp(lnk, file->u.link) == 0) {
 528                                         if (itemizing) {
 529                                                 itemize(file, 0, &st, 0,
 530                                                         f_out, ndx);
 531                                         }
 532                                         set_perms(fname, file, &st,
 533                                                   maybe_PERMS_REPORT);
 534                                         return;
 535                                 }
 536                         }
 537                         /* Not the right symlink (or not a symlink), so
 538                          * delete it. */
 539                         if (S_ISLNK(st.st_mode))
 540                                 delete_file(fname, st.st_mode, DEL_TERSE);
 541                         else {
 542                                 delete_file(fname, st.st_mode, DEL_TERSE);
 543                                 statret = -1;
 544                         }
 545                 }
 546                 if (do_symlink(file->u.link,fname) != 0) {
 547                         rsyserr(FERROR, errno, "symlink %s -> \"%s\" failed",
 548                                 full_fname(fname), safe_fname(file->u.link));
 549                 } else {
 550                         set_perms(fname,file,NULL,0);
 551                         if (itemizing) {
 552                                 itemize(file, statret, &st, SID_UPDATING,
 553                                         f_out, ndx);
 554                         }
 555                         if (code && verbose) {
 556                                 rprintf(code, "%s -> %s\n", safe_fname(fname),
 557                                         safe_fname(file->u.link));
 558                         }
 559                         if (remove_sent_files && !dry_run) {
 560                                 char numbuf[4];
 561                                 SIVAL(numbuf, 0, ndx);
 562                                 send_msg(MSG_SUCCESS, numbuf, 4);
 563                         }
 564                 }
 565 #endif
 566                 return;
 567         }
 568
 569         if (am_root && preserve_devices && IS_DEVICE(file->mode)) {
 570                 if (statret != 0 ||
 571                     st.st_mode != file->mode ||
 572                     st.st_rdev != file->u.rdev) {
 573                         if (IS_DEVICE(st.st_mode))
 574                                 delete_file(fname, st.st_mode, DEL_TERSE);
 575                         else {
 576                                 delete_file(fname, st.st_mode, DEL_TERSE);
 577                                 statret = -1;
 578                         }
 579                         if (verbose > 2) {
 580                                 rprintf(FINFO,"mknod(%s,0%o,0x%x)\n",
 581                                         safe_fname(fname),
 582                                         (int)file->mode, (int)file->u.rdev);
 583                         }
 584                         if (do_mknod(fname,file->mode,file->u.rdev) != 0) {
 585                                 rsyserr(FERROR, errno, "mknod %s failed",
 586                                         full_fname(fname));
 587                         } else {
 588                                 set_perms(fname,file,NULL,0);
 589                                 if (itemizing) {
 590                                         itemize(file, statret, &st, SID_UPDATING,
 591                                                 f_out, ndx);
 592                                 }
 593                                 if (code && verbose) {
 594                                         rprintf(code, "%s\n",
 595                                                 safe_fname(fname));
 596                                 }
 597                         }
 598                 } else {
 599                         if (itemizing) {
 600                                 itemize(file, statret, &st, 0,
 601                                         f_out, ndx);
 602                         }
 603                         set_perms(fname, file, &st, maybe_PERMS_REPORT);
 604                 }
 605                 return;
 606         }
 607
 608         if (preserve_hard_links && hard_link_check(file, HL_CHECK_MASTER))
 609                 return;
 610
 611         if (!S_ISREG(file->mode)) {
 612                 rprintf(FINFO, "skipping non-regular file \"%s\"\n",
 613                         safe_fname(fname));
 614                 return;
 615         }
 616
 617         fnamecmp = fname;
 618         fnamecmp_type = FNAMECMP_FNAME;
 619
 620         if (statret != 0 && basis_dir[0] != NULL) {
 621                 int fallback_match = -1;
 622                 int match_level = 0;
 623                 int i = 0;
 624                 do {
 625                         pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 626                                  basis_dir[i], fname);
 627                         if (link_stat(fnamecmpbuf, &st, 0) == 0
 628                             && S_ISREG(st.st_mode)) {
 629                                 statret = 0;
 630                                 if (link_dest) {
 631                                         if (!match_level) {
 632                                                 fallback_match = i;
 633                                                 match_level = 1;
 634                                         } else if (match_level == 2
 635                                             && !unchanged_attrs(file, &st))
 636                                                 continue;
 637                                         if (!unchanged_file(fnamecmpbuf, file, &st))
 638                                                 continue;
 639                                         fallback_match = i;
 640                                         match_level = 2;
 641                                         if (!unchanged_attrs(file, &st))
 642                                                 continue;
 643                                 }
 644                                 match_level = 3;
 645                                 break;
 646                         }
 647                 } while (basis_dir[++i] != NULL);
 648                 if (statret == 0) {
 649                         if (match_level < 3) {
 650                                 i = fallback_match;
 651                                 pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 652                                          basis_dir[i], fname);
 653                         }
 654 #ifdef HAVE_LINK
 655                         if (link_dest && match_level == 3 && !dry_run) {
 656                                 if (do_link(fnamecmpbuf, fname) < 0) {
 657                                         if (verbose) {
 658                                                 rsyserr(FINFO, errno,
 659                                                         "link %s => %s",
 660                                                         full_fname(fnamecmpbuf),
 661                                                         safe_fname(fname));
 662                                         }
 663                                         fnamecmp = fnamecmpbuf;
 664                                         fnamecmp_type = i;
 665                                 }
 666                         } else
 667 #endif
 668                         {
 669                                 fnamecmp = fnamecmpbuf;
 670                                 fnamecmp_type = i;
 671                         }
 672                 }
 673         }
 674
 675         if (statret == 0 && !S_ISREG(st.st_mode)) {
 676                 if (delete_file(fname, st.st_mode, DEL_TERSE) != 0)
 677                         return;
 678                 statret = -1;
 679                 stat_errno = ENOENT;
 680         }
 681
 682         if (partial_dir && (partialptr = partial_dir_fname(fname)) != NULL
 683             && link_stat(partialptr, &partial_st, 0) == 0
 684             && S_ISREG(partial_st.st_mode)) {
 685                 if (statret != 0)
 686                         goto prepare_to_open;
 687         } else
 688                 partialptr = NULL;
 689
 690         if (statret != 0 && fuzzy_basis && dry_run <= 1) {
 691                 int j = find_fuzzy(file, fuzzy_dirlist);
 692                 if (j >= 0) {
 693                         fuzzy_file = fuzzy_dirlist->files[j];
 694                         f_name_to(fuzzy_file, fnamecmpbuf);
 695                         if (verbose > 2) {
 696                                 rprintf(FINFO, "fuzzy basis selected for %s: %s\n",
 697                                         safe_fname(fname), safe_fname(fnamecmpbuf));
 698                         }
 699                         st.st_mode = fuzzy_file->mode;
 700                         st.st_size = fuzzy_file->length;
 701                         st.st_mtime = fuzzy_file->modtime;
 702                         statret = 0;
 703                         fnamecmp = fnamecmpbuf;
 704                         fnamecmp_type = FNAMECMP_FUZZY;
 705                 }
 706         }
 707
 708         if (statret != 0) {
 709                 if (preserve_hard_links && hard_link_check(file, HL_SKIP))
 710                         return;
 711                 if (stat_errno == ENOENT)
 712                         goto notify_others;
 713                 if (verbose > 1) {
 714                         rsyserr(FERROR, stat_errno,
 715                                 "recv_generator: failed to stat %s",
 716                                 full_fname(fname));
 717                 }
 718                 return;
 719         }
 720
 721         if (opt_ignore_existing && fnamecmp_type == FNAMECMP_FNAME) {
 722                 if (verbose > 1)
 723                         rprintf(FINFO, "%s exists\n", safe_fname(fname));
 724                 return;
 725         }
 726
 727         if (update_only && fnamecmp_type == FNAMECMP_FNAME
 728             && cmp_modtime(st.st_mtime, file->modtime) > 0) {
 729                 if (verbose > 1)
 730                         rprintf(FINFO, "%s is newer\n", safe_fname(fname));
 731                 return;
 732         }
 733
 734         if (!compare_dest && fnamecmp_type <= FNAMECMP_BASIS_DIR_HIGH)
 735                 ;
 736         else if (fnamecmp_type == FNAMECMP_FUZZY)
 737                 ;
 738         else if (unchanged_file(fnamecmp, file, &st)) {
 739                 if (itemizing) {
 740                         itemize(file, statret, &st,
 741                                 fnamecmp_type == FNAMECMP_FNAME
 742                                                ? 0 : SID_NO_DEST_AND_NO_UPDATE,
 743                                 f_out, ndx);
 744                 }
 745                 if (fnamecmp_type == FNAMECMP_FNAME)
 746                         set_perms(fname, file, &st, maybe_PERMS_REPORT);
 747                 return;
 748         }
 749
 750 prepare_to_open:
 751         if (partialptr) {
 752                 st = partial_st;
 753                 fnamecmp = partialptr;
 754                 fnamecmp_type = FNAMECMP_PARTIAL_DIR;
 755                 statret = 0;
 756         }
 757
 758         if (dry_run || read_batch)
 759                 goto notify_others;
 760         if (whole_file > 0) {
 761                 if (statret == 0)
 762                         statret = 1;
 763                 goto notify_others;
 764         }
 765
 766         if (fuzzy_basis) {
 767                 int j = flist_find(fuzzy_dirlist, file);
 768                 if (j >= 0) /* don't use changing file as future fuzzy basis */
 769                         fuzzy_dirlist->files[j]->flags |= FLAG_NO_FUZZY;
 770         }
 771
 772         /* open the file */
 773         fd = do_open(fnamecmp, O_RDONLY, 0);
 774
 775         if (fd == -1) {
 776                 rsyserr(FERROR, errno, "failed to open %s, continuing",
 777                         full_fname(fnamecmp));
 778             pretend_missing:
 779                 /* pretend the file didn't exist */
 780                 if (preserve_hard_links && hard_link_check(file, HL_SKIP))
 781                         return;
 782                 statret = -1;
 783                 goto notify_others;
 784         }
 785
 786         if (inplace && make_backups) {
 787                 if (!(backupptr = get_backup_name(fname))) {
 788                         close(fd);
 789                         return;
 790                 }
 791                 if (!(back_file = make_file(fname, NULL, NO_FILTERS))) {
 792                         close(fd);
 793                         goto pretend_missing;
 794                 }
 795                 if (robust_unlink(backupptr) && errno != ENOENT) {
 796                         rsyserr(FERROR, errno, "unlink %s",
 797                                 full_fname(backupptr));
 798                         free(back_file);
 799                         close(fd);
 800                         return;
 801                 }
 802                 if ((f_copy = do_open(backupptr,
 803                     O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0600)) < 0) {
 804                         rsyserr(FERROR, errno, "open %s",
 805                                 full_fname(backupptr));
 806                         free(back_file);
 807                         close(fd);
 808                         return;
 809                 }
 810                 fnamecmp_type = FNAMECMP_BACKUP;
 811         }
 812
 813         if (verbose > 3) {
 814                 rprintf(FINFO, "gen mapped %s of size %.0f\n",
 815                         safe_fname(fnamecmp), (double)st.st_size);
 816         }
 817
 818         if (verbose > 2)
 819                 rprintf(FINFO, "generating and sending sums for %d\n", ndx);
 820
 821 notify_others:
 822         write_int(f_out, ndx);
 823         if (itemizing) {
 824                 itemize(file, statret, &st, SID_UPDATING
 825                         | (always_checksum ? SID_REPORT_CHECKSUM : 0),
 826                         f_out, -1);
 827                 if (inplace && !read_batch)
 828                         write_byte(f_out, fnamecmp_type);
 829         }
 830         if (f_out_name >= 0) {
 831                 write_byte(f_out_name, fnamecmp_type);
 832                 if (fnamecmp_type == FNAMECMP_FUZZY) {
 833                         uchar lenbuf[3], *lb = lenbuf;
 834                         int len = strlen(fuzzy_file->basename);
 835                         if (len > 0x7F) {
 836 #if MAXPATHLEN > 0x7FFF
 837                                 *lb++ = len / 0x10000 + 0x80;
 838                                 *lb++ = len / 0x100;
 839 #else
 840                                 *lb++ = len / 0x100 + 0x80;
 841 #endif
 842                         }
 843                         *lb = len;
 844                         write_buf(f_out_name, lenbuf, lb - lenbuf + 1);
 845                         write_buf(f_out_name, fuzzy_file->basename, len);
 846                 }
 847         }
 848
 849         if (dry_run || read_batch)
 850                 return;
 851
 852         if (statret == 0) {
 853                 generate_and_send_sums(fd, st.st_size, f_out, f_copy);
 854
 855                 if (f_copy >= 0) {
 856                         close(f_copy);
 857                         set_perms(backupptr, back_file, NULL, 0);
 858                         if (verbose > 1) {
 859                                 rprintf(FINFO, "backed up %s to %s\n",
 860                                         safe_fname(fname), safe_fname(backupptr));
 861                         }
 862                         free(back_file);
 863                 }
 864
 865                 close(fd);
 866         } else
 867                 write_sum_head(f_out, NULL);
 868 }
 869
 870
 871 void generate_files(int f_out, struct file_list *flist, char *local_name,
 872                     int f_out_name)
 873 {
 874         int i;
 875         int phase = 0;
 876         char fbuf[MAXPATHLEN];
 877         int need_retouch_dir_times = preserve_times && !omit_dir_times;
 878         int need_retouch_dir_perms = 0;
 879         int save_only_existing = only_existing;
 880         int save_opt_ignore_existing = opt_ignore_existing;
 881
 882         if (verbose > 2) {
 883                 rprintf(FINFO, "generator starting pid=%ld count=%d\n",
 884                         (long)getpid(), flist->count);
 885         }
 886
 887         if (verbose >= 2) {
 888                 rprintf(FINFO,
 889                         whole_file > 0
 890                         ? "delta-transmission disabled for local transfer or --whole-file\n"
 891                         : "delta transmission enabled\n");
 892         }
 893
 894         /* We expect to just sit around now, so don't exit on a timeout.
 895          * If we really get a timeout then the other process should exit. */
 896         io_timeout = 0;
 897
 898         for (i = 0; i < flist->count; i++) {
 899                 struct file_struct *file = flist->files[i];
 900                 struct file_struct copy;
 901
 902                 if (!file->basename)
 903                         continue;
 904
 905                 /* We need to ensure that any dirs we create have writeable
 906                  * permissions during the time we are putting files within
 907                  * them.  This is then fixed after the transfer is done. */
 908                 if (!am_root && S_ISDIR(file->mode) && !(file->mode & S_IWUSR)) {
 909                         copy = *file;
 910                         copy.mode |= S_IWUSR; /* user write */
 911                         file = &copy;
 912                         need_retouch_dir_perms = 1;
 913                 }
 914
 915                 recv_generator(local_name ? local_name : f_name_to(file, fbuf),
 916                                flist, file, i, f_out, f_out_name);
 917         }
 918         recv_generator(NULL, NULL, NULL, 0, -1, -1);
 919         if (delete_during)
 920                 delete_in_dir(NULL, NULL, NULL);
 921
 922         phase++;
 923         csum_length = SUM_LENGTH;
 924         only_existing = max_size = opt_ignore_existing = 0;
 925         update_only = always_checksum = size_only = 0;
 926         ignore_times = 1;
 927
 928         if (verbose > 2)
 929                 rprintf(FINFO,"generate_files phase=%d\n",phase);
 930
 931         write_int(f_out, -1);
 932
 933         /* files can cycle through the system more than once
 934          * to catch initial checksum errors */
 935         while ((i = get_redo_num()) != -1) {
 936                 struct file_struct *file = flist->files[i];
 937                 recv_generator(local_name ? local_name : f_name_to(file, fbuf),
 938                                flist, file, i, f_out, f_out_name);
 939         }
 940
 941         phase++;
 942         only_existing = save_only_existing;
 943         opt_ignore_existing = save_opt_ignore_existing;
 944
 945         if (verbose > 2)
 946                 rprintf(FINFO,"generate_files phase=%d\n",phase);
 947
 948         write_int(f_out, -1);
 949
 950         /* Read post-redo-phase MSG_DONE and any prior messages. */
 951         get_redo_num();
 952
 953         if (preserve_hard_links)
 954                 do_hard_links();
 955
 956         if ((need_retouch_dir_perms || need_retouch_dir_times)
 957             && !list_only && !local_name && !dry_run) {
 958                 /* Now we need to fix any directory permissions that were
 959                  * modified during the transfer and/or re-set any tweaked
 960                  * modified-time values. */
 961                 for (i = 0; i < flist->count; i++) {
 962                         struct file_struct *file = flist->files[i];
 963                         if (!file->basename || !S_ISDIR(file->mode))
 964                                 continue;
 965                         if (!need_retouch_dir_times && file->mode & S_IWUSR)
 966                                 continue;
 967                         recv_generator(local_name ? local_name : f_name(file),
 968                                        flist, file, i, -1, -1);
 969                 }
 970         }
 971         recv_generator(NULL, NULL, NULL, 0, -1, -1);
 972
 973         if (verbose > 2)
 974                 rprintf(FINFO,"generate_files finished\n");
 975 }