generator.c

   1 /*
   2  * Routines that are exclusive to the generator process.
   3  *
   4  * Copyright (C) 1996-2000 Andrew Tridgell
   5  * Copyright (C) 1996 Paul Mackerras
   6  * Copyright (C) 2002 Martin Pool <mbp@samba.org>
   7  * Copyright (C) 2003-2008 Wayne Davison
   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 3 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 along
  20  * with this program; if not, visit the http://fsf.org website.
  21  */
  22
  23 #include "rsync.h"
  24
  25 extern int verbose;
  26 extern int dry_run;
  27 extern int do_xfers;
  28 extern int stdout_format_has_i;
  29 extern int logfile_format_has_i;
  30 extern int am_root;
  31 extern int am_server;
  32 extern int am_daemon;
  33 extern int inc_recurse;
  34 extern int do_progress;
  35 extern int relative_paths;
  36 extern int implied_dirs;
  37 extern int keep_dirlinks;
  38 extern int preserve_acls;
  39 extern int preserve_xattrs;
  40 extern int preserve_links;
  41 extern int preserve_devices;
  42 extern int preserve_specials;
  43 extern int preserve_hard_links;
  44 extern int preserve_executability;
  45 extern int preserve_perms;
  46 extern int preserve_times;
  47 extern int uid_ndx;
  48 extern int gid_ndx;
  49 extern int delete_mode;
  50 extern int delete_before;
  51 extern int delete_during;
  52 extern int delete_after;
  53 extern int msgdone_cnt;
  54 extern int ignore_errors;
  55 extern int remove_source_files;
  56 extern int delay_updates;
  57 extern int update_only;
  58 extern int ignore_existing;
  59 extern int ignore_non_existing;
  60 extern int inplace;
  61 extern int append_mode;
  62 extern int make_backups;
  63 extern int csum_length;
  64 extern int ignore_times;
  65 extern int size_only;
  66 extern OFF_T max_size;
  67 extern OFF_T min_size;
  68 extern int io_error;
  69 extern int flist_eof;
  70 extern int allowed_lull;
  71 extern int sock_f_out;
  72 extern int ignore_timeout;
  73 extern int protocol_version;
  74 extern int file_total;
  75 extern int fuzzy_basis;
  76 extern int always_checksum;
  77 extern int checksum_len;
  78 extern char *partial_dir;
  79 extern char *basis_dir[];
  80 extern int compare_dest;
  81 extern int copy_dest;
  82 extern int link_dest;
  83 extern int whole_file;
  84 extern int list_only;
  85 extern int read_batch;
  86 extern int safe_symlinks;
  87 extern long block_size; /* "long" because popt can't set an int32. */
  88 extern int unsort_ndx;
  89 extern int max_delete;
  90 extern int force_delete;
  91 extern int one_file_system;
  92 extern int check_for_io_err;
  93 extern struct stats stats;
  94 extern dev_t filesystem_dev;
  95 extern mode_t orig_umask;
  96 extern uid_t our_uid;
  97 extern char *backup_dir;
  98 extern char *backup_suffix;
  99 extern int backup_suffix_len;
 100 extern struct file_list *cur_flist, *first_flist, *dir_flist;
 101 extern struct filter_list_struct daemon_filter_list;
 102
 103 int ignore_perishable = 0;
 104 int non_perishable_cnt = 0;
 105 int maybe_ATTRS_REPORT = 0;
 106
 107 static dev_t dev_zero;
 108 static int deletion_count = 0; /* used to implement --max-delete */
 109 static int deldelay_size = 0, deldelay_cnt = 0;
 110 static char *deldelay_buf = NULL;
 111 static int deldelay_fd = -1;
 112 static int loopchk_limit;
 113 static int dir_tweaking;
 114 static int symlink_timeset_failed_flags;
 115 static int need_retouch_dir_times;
 116 static int need_retouch_dir_perms;
 117 static const char *solo_file = NULL;
 118
 119 /* For calling delete_item() and delete_dir_contents(). */
 120 #define DEL_NO_UID_WRITE        (1<<0) /* file/dir has our uid w/o write perm */
 121 #define DEL_RECURSE             (1<<1) /* if dir, delete all contents */
 122 #define DEL_DIR_IS_EMPTY        (1<<2) /* internal delete_FUNCTIONS use only */
 123 #define DEL_FOR_FILE            (1<<3) /* making room for a replacement file */
 124 #define DEL_FOR_DIR             (1<<4) /* making room for a replacement dir */
 125 #define DEL_FOR_SYMLINK         (1<<5) /* making room for a replacement symlink */
 126 #define DEL_FOR_DEVICE          (1<<6) /* making room for a replacement device */
 127 #define DEL_FOR_SPECIAL         (1<<7) /* making room for a replacement special */
 128
 129 #define DEL_MAKE_ROOM (DEL_FOR_FILE|DEL_FOR_DIR|DEL_FOR_SYMLINK|DEL_FOR_DEVICE|DEL_FOR_SPECIAL)
 130
 131 enum nonregtype {
 132     TYPE_DIR, TYPE_SPECIAL, TYPE_DEVICE, TYPE_SYMLINK
 133 };
 134
 135 enum delret {
 136     DR_SUCCESS = 0, DR_FAILURE, DR_AT_LIMIT, DR_NOT_EMPTY
 137 };
 138
 139 /* Forward declarations. */
 140 static enum delret delete_dir_contents(char *fname, uint16 flags);
 141 #ifdef SUPPORT_HARD_LINKS
 142 static void handle_skipped_hlink(struct file_struct *file, int itemizing,
 143                                  enum logcode code, int f_out);
 144 #endif
 145
 146 static int is_backup_file(char *fn)
 147 {
 148         int k = strlen(fn) - backup_suffix_len;
 149         return k > 0 && strcmp(fn+k, backup_suffix) == 0;
 150 }
 151
 152 /* Delete a file or directory.  If DEL_RECURSE is set in the flags, this will
 153  * delete recursively.
 154  *
 155  * Note that fbuf must point to a MAXPATHLEN buffer if the mode indicates it's
 156  * a directory! (The buffer is used for recursion, but returned unchanged.)
 157  */
 158 static enum delret delete_item(char *fbuf, uint16 mode, uint16 flags)
 159 {
 160         enum delret ret;
 161         char *what;
 162         int ok;
 163
 164         if (verbose > 2) {
 165                 rprintf(FINFO, "delete_item(%s) mode=%o flags=%d\n",
 166                         fbuf, (int)mode, (int)flags);
 167         }
 168
 169         if (flags & DEL_NO_UID_WRITE)
 170                 do_chmod(fbuf, mode | S_IWUSR);
 171
 172         if (S_ISDIR(mode) && !(flags & DEL_DIR_IS_EMPTY)) {
 173                 int save_uid_ndx = uid_ndx;
 174                 /* This only happens on the first call to delete_item() since
 175                  * delete_dir_contents() always calls us w/DEL_DIR_IS_EMPTY. */
 176                 if (!uid_ndx)
 177                         uid_ndx = ++file_extra_cnt;
 178                 ignore_perishable = 1;
 179                 /* If DEL_RECURSE is not set, this just reports emptiness. */
 180                 ret = delete_dir_contents(fbuf, flags);
 181                 ignore_perishable = 0;
 182                 if (!save_uid_ndx) {
 183                         --file_extra_cnt;
 184                         uid_ndx = 0;
 185                 }
 186                 if (ret == DR_NOT_EMPTY || ret == DR_AT_LIMIT)
 187                         goto check_ret;
 188                 /* OK: try to delete the directory. */
 189         }
 190
 191         if (!(flags & DEL_MAKE_ROOM) && max_delete >= 0 && ++deletion_count > max_delete)
 192                 return DR_AT_LIMIT;
 193
 194         if (S_ISDIR(mode)) {
 195                 what = "rmdir";
 196                 ok = do_rmdir(fbuf) == 0;
 197         } else if (make_backups > 0 && (backup_dir || !is_backup_file(fbuf))) {
 198                 what = "make_backup";
 199                 ok = make_backup(fbuf);
 200         } else {
 201                 what = "unlink";
 202                 ok = robust_unlink(fbuf) == 0;
 203         }
 204
 205         if (ok) {
 206                 if (!(flags & DEL_MAKE_ROOM))
 207                         log_delete(fbuf, mode);
 208                 ret = DR_SUCCESS;
 209         } else {
 210                 if (S_ISDIR(mode) && errno == ENOTEMPTY) {
 211                         rprintf(FINFO, "cannot delete non-empty directory: %s\n",
 212                                 fbuf);
 213                         ret = DR_NOT_EMPTY;
 214                 } else if (errno != ENOENT) {
 215                         rsyserr(FERROR, errno, "delete_file: %s(%s) failed",
 216                                 what, fbuf);
 217                         ret = DR_FAILURE;
 218                 } else {
 219                         deletion_count--;
 220                         ret = DR_SUCCESS;
 221                 }
 222         }
 223
 224   check_ret:
 225         if (ret != DR_SUCCESS && flags & DEL_MAKE_ROOM) {
 226                 const char *desc;
 227                 switch (flags & DEL_MAKE_ROOM) {
 228                 case DEL_FOR_FILE: desc = "regular file"; break;
 229                 case DEL_FOR_DIR: desc = "directory"; break;
 230                 case DEL_FOR_SYMLINK: desc = "symlink"; break;
 231                 case DEL_FOR_DEVICE: desc = "device file"; break;
 232                 case DEL_FOR_SPECIAL: desc = "special file"; break;
 233                 default: exit_cleanup(RERR_UNSUPPORTED); /* IMPOSSIBLE */
 234                 }
 235                 rprintf(FERROR_XFER, "could not make way for new %s: %s\n",
 236                         desc, fbuf);
 237         }
 238         return ret;
 239 }
 240
 241 /* The directory is about to be deleted: if DEL_RECURSE is given, delete all
 242  * its contents, otherwise just checks for content.  Returns DR_SUCCESS or
 243  * DR_NOT_EMPTY.  Note that fname must point to a MAXPATHLEN buffer!  (The
 244  * buffer is used for recursion, but returned unchanged.)
 245  */
 246 static enum delret delete_dir_contents(char *fname, uint16 flags)
 247 {
 248         struct file_list *dirlist;
 249         enum delret ret;
 250         unsigned remainder;
 251         void *save_filters;
 252         int j, dlen;
 253         char *p;
 254
 255         if (verbose > 3) {
 256                 rprintf(FINFO, "delete_dir_contents(%s) flags=%d\n",
 257                         fname, flags);
 258         }
 259
 260         dlen = strlen(fname);
 261         save_filters = push_local_filters(fname, dlen);
 262
 263         non_perishable_cnt = 0;
 264         dirlist = get_dirlist(fname, dlen, 0);
 265         ret = non_perishable_cnt ? DR_NOT_EMPTY : DR_SUCCESS;
 266
 267         if (!dirlist->used)
 268                 goto done;
 269
 270         if (!(flags & DEL_RECURSE)) {
 271                 ret = DR_NOT_EMPTY;
 272                 goto done;
 273         }
 274
 275         p = fname + dlen;
 276         if (dlen != 1 || *fname != '/')
 277                 *p++ = '/';
 278         remainder = MAXPATHLEN - (p - fname);
 279
 280         /* We do our own recursion, so make delete_item() non-recursive. */
 281         flags = (flags & ~(DEL_RECURSE|DEL_MAKE_ROOM|DEL_NO_UID_WRITE))
 282               | DEL_DIR_IS_EMPTY;
 283
 284         for (j = dirlist->used; j--; ) {
 285                 struct file_struct *fp = dirlist->files[j];
 286
 287                 if (fp->flags & FLAG_MOUNT_DIR && S_ISDIR(fp->mode)) {
 288                         if (verbose > 1) {
 289                                 rprintf(FINFO,
 290                                     "mount point, %s, pins parent directory\n",
 291                                     f_name(fp, NULL));
 292                         }
 293                         ret = DR_NOT_EMPTY;
 294                         continue;
 295                 }
 296
 297                 strlcpy(p, fp->basename, remainder);
 298                 if (!(fp->mode & S_IWUSR) && !am_root && (uid_t)F_OWNER(fp) == our_uid)
 299                         do_chmod(fname, fp->mode | S_IWUSR);
 300                 /* Save stack by recursing to ourself directly. */
 301                 if (S_ISDIR(fp->mode)) {
 302                         if (delete_dir_contents(fname, flags | DEL_RECURSE) != DR_SUCCESS)
 303                                 ret = DR_NOT_EMPTY;
 304                 }
 305                 if (delete_item(fname, fp->mode, flags) != DR_SUCCESS)
 306                         ret = DR_NOT_EMPTY;
 307         }
 308
 309         fname[dlen] = '\0';
 310
 311   done:
 312         flist_free(dirlist);
 313         pop_local_filters(save_filters);
 314
 315         if (ret == DR_NOT_EMPTY) {
 316                 rprintf(FINFO, "cannot delete non-empty directory: %s\n",
 317                         fname);
 318         }
 319         return ret;
 320 }
 321
 322 static int start_delete_delay_temp(void)
 323 {
 324         char fnametmp[MAXPATHLEN];
 325         int save_dry_run = dry_run;
 326
 327         dry_run = 0;
 328         if (!get_tmpname(fnametmp, "deldelay")
 329          || (deldelay_fd = do_mkstemp(fnametmp, 0600)) < 0) {
 330                 rprintf(FINFO, "NOTE: Unable to create delete-delay temp file%s.\n",
 331                         inc_recurse ? "" : " -- switching to --delete-after");
 332                 delete_during = 0;
 333                 delete_after = !inc_recurse;
 334                 dry_run = save_dry_run;
 335                 return 0;
 336         }
 337         unlink(fnametmp);
 338         dry_run = save_dry_run;
 339         return 1;
 340 }
 341
 342 static int flush_delete_delay(void)
 343 {
 344         if (deldelay_fd < 0 && !start_delete_delay_temp())
 345                 return 0;
 346         if (write(deldelay_fd, deldelay_buf, deldelay_cnt) != deldelay_cnt) {
 347                 rsyserr(FERROR, errno, "flush of delete-delay buffer");
 348                 delete_during = 0;
 349                 delete_after = !inc_recurse;
 350                 close(deldelay_fd);
 351                 return 0;
 352         }
 353         deldelay_cnt = 0;
 354         return 1;
 355 }
 356
 357 static int remember_delete(struct file_struct *file, const char *fname, int flags)
 358 {
 359         int len;
 360
 361         if (deldelay_cnt == deldelay_size && !flush_delete_delay())
 362                 return 0;
 363
 364         if (flags & DEL_NO_UID_WRITE)
 365                 deldelay_buf[deldelay_cnt++] = '!';
 366
 367         while (1) {
 368                 len = snprintf(deldelay_buf + deldelay_cnt,
 369                                deldelay_size - deldelay_cnt,
 370                                "%x %s%c",
 371                                (int)file->mode, fname, '\0');
 372                 if ((deldelay_cnt += len) <= deldelay_size)
 373                         break;
 374                 deldelay_cnt -= len;
 375                 if (!flush_delete_delay())
 376                         return 0;
 377         }
 378
 379         return 1;
 380 }
 381
 382 static int read_delay_line(char *buf, int *flags_p)
 383 {
 384         static int read_pos = 0;
 385         int j, len, mode;
 386         char *bp, *past_space;
 387
 388         while (1) {
 389                 for (j = read_pos; j < deldelay_cnt && deldelay_buf[j]; j++) {}
 390                 if (j < deldelay_cnt)
 391                         break;
 392                 if (deldelay_fd < 0) {
 393                         if (j > read_pos)
 394                                 goto invalid_data;
 395                         return -1;
 396                 }
 397                 deldelay_cnt -= read_pos;
 398                 if (deldelay_cnt == deldelay_size)
 399                         goto invalid_data;
 400                 if (deldelay_cnt && read_pos) {
 401                         memmove(deldelay_buf, deldelay_buf + read_pos,
 402                                 deldelay_cnt);
 403                 }
 404                 len = read(deldelay_fd, deldelay_buf + deldelay_cnt,
 405                            deldelay_size - deldelay_cnt);
 406                 if (len == 0) {
 407                         if (deldelay_cnt) {
 408                                 rprintf(FERROR,
 409                                     "ERROR: unexpected EOF in delete-delay file.\n");
 410                         }
 411                         return -1;
 412                 }
 413                 if (len < 0) {
 414                         rsyserr(FERROR, errno,
 415                                 "reading delete-delay file");
 416                         return -1;
 417                 }
 418                 deldelay_cnt += len;
 419                 read_pos = 0;
 420         }
 421
 422         bp = deldelay_buf + read_pos;
 423         if (*bp == '!') {
 424                 bp++;
 425                 *flags_p = DEL_NO_UID_WRITE;
 426         } else
 427                 *flags_p = 0;
 428
 429         if (sscanf(bp, "%x ", &mode) != 1) {
 430           invalid_data:
 431                 rprintf(FERROR, "ERROR: invalid data in delete-delay file.\n");
 432                 return -1;
 433         }
 434         past_space = strchr(bp, ' ') + 1;
 435         len = j - read_pos - (past_space - bp) + 1; /* count the '\0' */
 436         read_pos = j + 1;
 437
 438         if (len > MAXPATHLEN) {
 439                 rprintf(FERROR, "ERROR: filename too long in delete-delay file.\n");
 440                 return -1;
 441         }
 442
 443         /* The caller needs the name in a MAXPATHLEN buffer, so we copy it
 444          * instead of returning a pointer to our buffer. */
 445         memcpy(buf, past_space, len);
 446
 447         return mode;
 448 }
 449
 450 static void do_delayed_deletions(char *delbuf)
 451 {
 452         int mode, flags;
 453
 454         if (deldelay_fd >= 0) {
 455                 if (deldelay_cnt && !flush_delete_delay())
 456                         return;
 457                 lseek(deldelay_fd, 0, 0);
 458         }
 459         while ((mode = read_delay_line(delbuf, &flags)) >= 0)
 460                 delete_item(delbuf, mode, flags | DEL_RECURSE);
 461         if (deldelay_fd >= 0)
 462                 close(deldelay_fd);
 463 }
 464
 465 /* This function is used to implement per-directory deletion, and is used by
 466  * all the --delete-WHEN options.  Note that the fbuf pointer must point to a
 467  * MAXPATHLEN buffer with the name of the directory in it (the functions we
 468  * call will append names onto the end, but the old dir value will be restored
 469  * on exit). */
 470 static void delete_in_dir(char *fbuf, struct file_struct *file, dev_t *fs_dev)
 471 {
 472         static int already_warned = 0;
 473         struct file_list *dirlist;
 474         char delbuf[MAXPATHLEN];
 475         int dlen, i;
 476         int save_uid_ndx = uid_ndx;
 477
 478         if (!fbuf) {
 479                 change_local_filter_dir(NULL, 0, 0);
 480                 return;
 481         }
 482
 483         if (verbose > 2)
 484                 rprintf(FINFO, "delete_in_dir(%s)\n", fbuf);
 485
 486         if (allowed_lull)
 487                 maybe_send_keepalive();
 488
 489         if (io_error && !ignore_errors) {
 490                 if (already_warned)
 491                         return;
 492                 rprintf(FINFO,
 493                         "IO error encountered -- skipping file deletion\n");
 494                 already_warned = 1;
 495                 return;
 496         }
 497
 498         dlen = strlen(fbuf);
 499         change_local_filter_dir(fbuf, dlen, F_DEPTH(file));
 500
 501         if (one_file_system) {
 502                 if (file->flags & FLAG_TOP_DIR)
 503                         filesystem_dev = *fs_dev;
 504                 else if (filesystem_dev != *fs_dev)
 505                         return;
 506         }
 507
 508         if (!uid_ndx)
 509                 uid_ndx = ++file_extra_cnt;
 510
 511         dirlist = get_dirlist(fbuf, dlen, 0);
 512
 513         /* If an item in dirlist is not found in flist, delete it
 514          * from the filesystem. */
 515         for (i = dirlist->used; i--; ) {
 516                 struct file_struct *fp = dirlist->files[i];
 517                 if (!F_IS_ACTIVE(fp))
 518                         continue;
 519                 if (fp->flags & FLAG_MOUNT_DIR && S_ISDIR(fp->mode)) {
 520                         if (verbose > 1)
 521                                 rprintf(FINFO, "cannot delete mount point: %s\n",
 522                                         f_name(fp, NULL));
 523                         continue;
 524                 }
 525                 if (flist_find(cur_flist, fp) < 0) {
 526                         int flags = DEL_RECURSE;
 527                         if (!(fp->mode & S_IWUSR) && !am_root && (uid_t)F_OWNER(fp) == our_uid)
 528                                 flags |= DEL_NO_UID_WRITE;
 529                         f_name(fp, delbuf);
 530                         if (delete_during == 2) {
 531                                 if (!remember_delete(fp, delbuf, flags))
 532                                         break;
 533                         } else
 534                                 delete_item(delbuf, fp->mode, flags);
 535                 }
 536         }
 537
 538         flist_free(dirlist);
 539
 540         if (!save_uid_ndx) {
 541                 --file_extra_cnt;
 542                 uid_ndx = 0;
 543         }
 544 }
 545
 546 /* This deletes any files on the receiving side that are not present on the
 547  * sending side.  This is used by --delete-before and --delete-after. */
 548 static void do_delete_pass(void)
 549 {
 550         char fbuf[MAXPATHLEN];
 551         STRUCT_STAT st;
 552         int j;
 553
 554         /* dry_run is incremented when the destination doesn't exist yet. */
 555         if (dry_run > 1 || list_only)
 556                 return;
 557
 558         for (j = 0; j < cur_flist->used; j++) {
 559                 struct file_struct *file = cur_flist->sorted[j];
 560
 561                 f_name(file, fbuf);
 562
 563                 if (!(file->flags & FLAG_CONTENT_DIR)) {
 564                         change_local_filter_dir(fbuf, strlen(fbuf), F_DEPTH(file));
 565                         continue;
 566                 }
 567
 568                 if (verbose > 1 && file->flags & FLAG_TOP_DIR)
 569                         rprintf(FINFO, "deleting in %s\n", fbuf);
 570
 571                 if (link_stat(fbuf, &st, keep_dirlinks) < 0
 572                  || !S_ISDIR(st.st_mode))
 573                         continue;
 574
 575                 delete_in_dir(fbuf, file, &st.st_dev);
 576         }
 577         delete_in_dir(NULL, NULL, &dev_zero);
 578
 579         if (do_progress && !am_server)
 580                 rprintf(FINFO, "                    \r");
 581 }
 582
 583 int unchanged_attrs(const char *fname, struct file_struct *file, stat_x *sxp)
 584 {
 585 #if !defined HAVE_LUTIMES || !defined HAVE_UTIMES
 586         if (S_ISLNK(file->mode)) {
 587                 ;
 588         } else
 589 #endif
 590         if (preserve_times && cmp_time(sxp->st.st_mtime, file->modtime) != 0)
 591                 return 0;
 592
 593         if (preserve_perms) {
 594                 if (!BITS_EQUAL(sxp->st.st_mode, file->mode, CHMOD_BITS))
 595                         return 0;
 596         } else if (preserve_executability
 597          && ((sxp->st.st_mode & 0111 ? 1 : 0) ^ (file->mode & 0111 ? 1 : 0)))
 598                 return 0;
 599
 600         if (am_root && uid_ndx && sxp->st.st_uid != (uid_t)F_OWNER(file))
 601                 return 0;
 602
 603         if (gid_ndx && !(file->flags & FLAG_SKIP_GROUP) && sxp->st.st_gid != (gid_t)F_GROUP(file))
 604                 return 0;
 605
 606 #ifdef SUPPORT_ACLS
 607         if (preserve_acls && !S_ISLNK(file->mode)) {
 608                 if (!ACL_READY(*sxp))
 609                         get_acl(fname, sxp);
 610                 if (set_acl(NULL, file, sxp) == 0)
 611                         return 0;
 612         }
 613 #endif
 614 #ifdef SUPPORT_XATTRS
 615         if (preserve_xattrs) {
 616                 if (!XATTR_READY(*sxp))
 617                         get_xattr(fname, sxp);
 618                 if (xattr_diff(file, sxp, 0))
 619                         return 0;
 620         }
 621 #endif
 622
 623         return 1;
 624 }
 625
 626 void itemize(const char *fnamecmp, struct file_struct *file, int ndx, int statret,
 627              stat_x *sxp, int32 iflags, uchar fnamecmp_type,
 628              const char *xname)
 629 {
 630         if (statret >= 0) { /* A from-dest-dir statret can == 1! */
 631                 int keep_time = !preserve_times ? 0
 632                     : S_ISDIR(file->mode) ? preserve_times > 1 :
 633 #if defined HAVE_LUTIMES && defined HAVE_UTIMES
 634                     1;
 635 #else
 636                     !S_ISLNK(file->mode);
 637 #endif
 638
 639                 if (S_ISREG(file->mode) && F_LENGTH(file) != sxp->st.st_size)
 640                         iflags |= ITEM_REPORT_SIZE;
 641                 if (file->flags & FLAG_TIME_FAILED) { /* symlinks only */
 642                         if (iflags & ITEM_LOCAL_CHANGE)
 643                                 iflags |= symlink_timeset_failed_flags;
 644                 } else if (keep_time
 645                  ? cmp_time(file->modtime, sxp->st.st_mtime) != 0
 646                  : iflags & (ITEM_TRANSFER|ITEM_LOCAL_CHANGE) && !(iflags & ITEM_MATCHED)
 647                   && (!(iflags & ITEM_XNAME_FOLLOWS) || *xname))
 648                         iflags |= ITEM_REPORT_TIME;
 649 #if !defined HAVE_LCHMOD && !defined HAVE_SETATTRLIST
 650                 if (S_ISLNK(file->mode)) {
 651                         ;
 652                 } else
 653 #endif
 654                 if (preserve_perms) {
 655                         if (!BITS_EQUAL(sxp->st.st_mode, file->mode, CHMOD_BITS))
 656                                 iflags |= ITEM_REPORT_PERMS;
 657                 } else if (preserve_executability
 658                  && ((sxp->st.st_mode & 0111 ? 1 : 0) ^ (file->mode & 0111 ? 1 : 0)))
 659                         iflags |= ITEM_REPORT_PERMS;
 660                 if (uid_ndx && am_root && (uid_t)F_OWNER(file) != sxp->st.st_uid)
 661                         iflags |= ITEM_REPORT_OWNER;
 662                 if (gid_ndx && !(file->flags & FLAG_SKIP_GROUP)
 663                     && sxp->st.st_gid != (gid_t)F_GROUP(file))
 664                         iflags |= ITEM_REPORT_GROUP;
 665 #ifdef SUPPORT_ACLS
 666                 if (preserve_acls && !S_ISLNK(file->mode)) {
 667                         if (!ACL_READY(*sxp))
 668                                 get_acl(fnamecmp, sxp);
 669                         if (set_acl(NULL, file, sxp) == 0)
 670                                 iflags |= ITEM_REPORT_ACL;
 671                 }
 672 #endif
 673 #ifdef SUPPORT_XATTRS
 674                 if (preserve_xattrs) {
 675                         if (!XATTR_READY(*sxp))
 676                                 get_xattr(fnamecmp, sxp);
 677                         if (xattr_diff(file, sxp, 1))
 678                                 iflags |= ITEM_REPORT_XATTR;
 679                 }
 680 #endif
 681         } else {
 682 #ifdef SUPPORT_XATTRS
 683                 if (preserve_xattrs && xattr_diff(file, NULL, 1))
 684                         iflags |= ITEM_REPORT_XATTR;
 685 #endif
 686                 iflags |= ITEM_IS_NEW;
 687         }
 688
 689         iflags &= 0xffff;
 690         if ((iflags & (SIGNIFICANT_ITEM_FLAGS|ITEM_REPORT_XATTR) || verbose > 1
 691           || stdout_format_has_i > 1 || (xname && *xname)) && !read_batch) {
 692                 if (protocol_version >= 29) {
 693                         if (ndx >= 0)
 694                                 write_ndx(sock_f_out, ndx);
 695                         write_shortint(sock_f_out, iflags);
 696                         if (iflags & ITEM_BASIS_TYPE_FOLLOWS)
 697                                 write_byte(sock_f_out, fnamecmp_type);
 698                         if (iflags & ITEM_XNAME_FOLLOWS)
 699                                 write_vstring(sock_f_out, xname, strlen(xname));
 700 #ifdef SUPPORT_XATTRS
 701                         if (preserve_xattrs && !dry_run
 702                          && iflags & (ITEM_REPORT_XATTR|ITEM_TRANSFER)) {
 703                                 send_xattr_request(NULL, file,
 704                                         iflags & ITEM_REPORT_XATTR ? sock_f_out : -1);
 705                         }
 706 #endif
 707                 } else if (ndx >= 0) {
 708                         enum logcode code = logfile_format_has_i ? FINFO : FCLIENT;
 709                         log_item(code, file, &stats, iflags, xname);
 710                 }
 711         }
 712 }
 713
 714
 715 /* Perform our quick-check heuristic for determining if a file is unchanged. */
 716 int unchanged_file(char *fn, struct file_struct *file, STRUCT_STAT *st)
 717 {
 718         if (st->st_size != F_LENGTH(file))
 719                 return 0;
 720
 721         /* if always checksum is set then we use the checksum instead
 722            of the file time to determine whether to sync */
 723         if (always_checksum > 0 && S_ISREG(st->st_mode)) {
 724                 char sum[MAX_DIGEST_LEN];
 725                 file_checksum(fn, sum, st->st_size);
 726                 return memcmp(sum, F_SUM(file), checksum_len) == 0;
 727         }
 728
 729         if (size_only > 0)
 730                 return 1;
 731
 732         if (ignore_times)
 733                 return 0;
 734
 735         return cmp_time(st->st_mtime, file->modtime) == 0;
 736 }
 737
 738
 739 /*
 740  * set (initialize) the size entries in the per-file sum_struct
 741  * calculating dynamic block and checksum sizes.
 742  *
 743  * This is only called from generate_and_send_sums() but is a separate
 744  * function to encapsulate the logic.
 745  *
 746  * The block size is a rounded square root of file length.
 747  *
 748  * The checksum size is determined according to:
 749  *     blocksum_bits = BLOCKSUM_BIAS + 2*log2(file_len) - log2(block_len)
 750  * provided by Donovan Baarda which gives a probability of rsync
 751  * algorithm corrupting data and falling back using the whole md4
 752  * checksums.
 753  *
 754  * This might be made one of several selectable heuristics.
 755  */
 756 static void sum_sizes_sqroot(struct sum_struct *sum, int64 len)
 757 {
 758         int32 blength;
 759         int s2length;
 760         int64 l;
 761
 762         if (block_size)
 763                 blength = block_size;
 764         else if (len <= BLOCK_SIZE * BLOCK_SIZE)
 765                 blength = BLOCK_SIZE;
 766         else {
 767                 int32 max_blength = protocol_version < 30 ? OLD_MAX_BLOCK_SIZE : MAX_BLOCK_SIZE;
 768                 int32 c;
 769                 int cnt;
 770                 for (c = 1, l = len, cnt = 0; l >>= 2; c <<= 1, cnt++) {}
 771                 if (c < 0 || c >= max_blength)
 772                         blength = max_blength;
 773                 else {
 774                     blength = 0;
 775                     do {
 776                             blength |= c;
 777                             if (len < (int64)blength * blength)
 778                                     blength &= ~c;
 779                             c >>= 1;
 780                     } while (c >= 8);   /* round to multiple of 8 */
 781                     blength = MAX(blength, BLOCK_SIZE);
 782                 }
 783         }
 784
 785         if (protocol_version < 27) {
 786                 s2length = csum_length;
 787         } else if (csum_length == SUM_LENGTH) {
 788                 s2length = SUM_LENGTH;
 789         } else {
 790                 int32 c;
 791                 int b = BLOCKSUM_BIAS;
 792                 for (l = len; l >>= 1; b += 2) {}
 793                 for (c = blength; (c >>= 1) && b; b--) {}
 794                 /* add a bit, subtract rollsum, round up. */
 795                 s2length = (b + 1 - 32 + 7) / 8; /* --optimize in compiler-- */
 796                 s2length = MAX(s2length, csum_length);
 797                 s2length = MIN(s2length, SUM_LENGTH);
 798         }
 799
 800         sum->flength    = len;
 801         sum->blength    = blength;
 802         sum->s2length   = s2length;
 803         sum->remainder  = (int32)(len % blength);
 804         sum->count      = (int32)(l = (len / blength) + (sum->remainder != 0));
 805
 806         if ((int64)sum->count != l)
 807                 sum->count = -1;
 808
 809         if (sum->count && verbose > 2) {
 810                 rprintf(FINFO,
 811                         "count=%.0f rem=%ld blength=%ld s2length=%d flength=%.0f\n",
 812                         (double)sum->count, (long)sum->remainder, (long)sum->blength,
 813                         sum->s2length, (double)sum->flength);
 814         }
 815 }
 816
 817
 818 /*
 819  * Generate and send a stream of signatures/checksums that describe a buffer
 820  *
 821  * Generate approximately one checksum every block_len bytes.
 822  */
 823 static int generate_and_send_sums(int fd, OFF_T len, int f_out, int f_copy)
 824 {
 825         int32 i;
 826         struct map_struct *mapbuf;
 827         struct sum_struct sum;
 828         OFF_T offset = 0;
 829
 830         sum_sizes_sqroot(&sum, len);
 831         if (sum.count < 0)
 832                 return -1;
 833         write_sum_head(f_out, &sum);
 834
 835         if (append_mode > 0 && f_copy < 0)
 836                 return 0;
 837
 838         if (len > 0)
 839                 mapbuf = map_file(fd, len, MAX_MAP_SIZE, sum.blength);
 840         else
 841                 mapbuf = NULL;
 842
 843         for (i = 0; i < sum.count; i++) {
 844                 int32 n1 = (int32)MIN(len, (OFF_T)sum.blength);
 845                 char *map = map_ptr(mapbuf, offset, n1);
 846                 char sum2[SUM_LENGTH];
 847                 uint32 sum1;
 848
 849                 len -= n1;
 850                 offset += n1;
 851
 852                 if (f_copy >= 0) {
 853                         full_write(f_copy, map, n1);
 854                         if (append_mode > 0)
 855                                 continue;
 856                 }
 857
 858                 sum1 = get_checksum1(map, n1);
 859                 get_checksum2(map, n1, sum2);
 860
 861                 if (verbose > 3) {
 862                         rprintf(FINFO,
 863                                 "chunk[%.0f] offset=%.0f len=%ld sum1=%08lx\n",
 864                                 (double)i, (double)offset - n1, (long)n1,
 865                                 (unsigned long)sum1);
 866                 }
 867                 write_int(f_out, sum1);
 868                 write_buf(f_out, sum2, sum.s2length);
 869         }
 870
 871         if (mapbuf)
 872                 unmap_file(mapbuf);
 873
 874         return 0;
 875 }
 876
 877
 878 /* Try to find a filename in the same dir as "fname" with a similar name. */
 879 static int find_fuzzy(struct file_struct *file, struct file_list *dirlist)
 880 {
 881         int fname_len, fname_suf_len;
 882         const char *fname_suf, *fname = file->basename;
 883         uint32 lowest_dist = 25 << 16; /* ignore a distance greater than 25 */
 884         int j, lowest_j = -1;
 885
 886         fname_len = strlen(fname);
 887         fname_suf = find_filename_suffix(fname, fname_len, &fname_suf_len);
 888
 889         for (j = 0; j < dirlist->used; j++) {
 890                 struct file_struct *fp = dirlist->files[j];
 891                 const char *suf, *name;
 892                 int len, suf_len;
 893                 uint32 dist;
 894
 895                 if (!S_ISREG(fp->mode) || !F_LENGTH(fp)
 896                  || fp->flags & FLAG_FILE_SENT)
 897                         continue;
 898
 899                 name = fp->basename;
 900
 901                 if (F_LENGTH(fp) == F_LENGTH(file)
 902                     && cmp_time(fp->modtime, file->modtime) == 0) {
 903                         if (verbose > 4) {
 904                                 rprintf(FINFO,
 905                                         "fuzzy size/modtime match for %s\n",
 906                                         name);
 907                         }
 908                         return j;
 909                 }
 910
 911                 len = strlen(name);
 912                 suf = find_filename_suffix(name, len, &suf_len);
 913
 914                 dist = fuzzy_distance(name, len, fname, fname_len);
 915                 /* Add some extra weight to how well the suffixes match. */
 916                 dist += fuzzy_distance(suf, suf_len, fname_suf, fname_suf_len)
 917                       * 10;
 918                 if (verbose > 4) {
 919                         rprintf(FINFO, "fuzzy distance for %s = %d.%05d\n",
 920                                 name, (int)(dist>>16), (int)(dist&0xFFFF));
 921                 }
 922                 if (dist <= lowest_dist) {
 923                         lowest_dist = dist;
 924                         lowest_j = j;
 925                 }
 926         }
 927
 928         return lowest_j;
 929 }
 930
 931 /* Copy a file found in our --copy-dest handling. */
 932 static int copy_altdest_file(const char *src, const char *dest, struct file_struct *file)
 933 {
 934         char buf[MAXPATHLEN];
 935         const char *copy_to, *partialptr;
 936         int save_preserve_xattrs = preserve_xattrs;
 937         int ok, fd_w;
 938
 939         if (inplace) {
 940                 /* Let copy_file open the destination in place. */
 941                 fd_w = -1;
 942                 copy_to = dest;
 943         } else {
 944                 fd_w = open_tmpfile(buf, dest, file);
 945                 if (fd_w < 0)
 946                         return -1;
 947                 copy_to = buf;
 948         }
 949         cleanup_set(copy_to, NULL, NULL, -1, -1);
 950         if (copy_file(src, copy_to, fd_w, file->mode, 0) < 0) {
 951                 if (verbose) {
 952                         rsyserr(FINFO, errno, "copy_file %s => %s",
 953                                 full_fname(src), copy_to);
 954                 }
 955                 /* Try to clean up. */
 956                 unlink(copy_to);
 957                 cleanup_disable();
 958                 return -1;
 959         }
 960         partialptr = partial_dir ? partial_dir_fname(dest) : NULL;
 961         preserve_xattrs = 0; /* xattrs were copied with file */
 962         ok = finish_transfer(dest, copy_to, src, partialptr, file, 1, 0);
 963         preserve_xattrs = save_preserve_xattrs;
 964         cleanup_disable();
 965         return ok ? 0 : -1;
 966 }
 967
 968 /* This is only called for regular files.  We return -2 if we've finished
 969  * handling the file, -1 if no dest-linking occurred, or a non-negative
 970  * value if we found an alternate basis file. */
 971 static int try_dests_reg(struct file_struct *file, char *fname, int ndx,
 972                          char *cmpbuf, stat_x *sxp, int itemizing,
 973                          enum logcode code)
 974 {
 975         int best_match = -1;
 976         int match_level = 0;
 977         int j = 0;
 978
 979         do {
 980                 pathjoin(cmpbuf, MAXPATHLEN, basis_dir[j], fname);
 981                 if (link_stat(cmpbuf, &sxp->st, 0) < 0 || !S_ISREG(sxp->st.st_mode))
 982                         continue;
 983                 switch (match_level) {
 984                 case 0:
 985                         best_match = j;
 986                         match_level = 1;
 987                         /* FALL THROUGH */
 988                 case 1:
 989                         if (!unchanged_file(cmpbuf, file, &sxp->st))
 990                                 continue;
 991                         best_match = j;
 992                         match_level = 2;
 993                         /* FALL THROUGH */
 994                 case 2:
 995                         if (!unchanged_attrs(cmpbuf, file, sxp))
 996                                 continue;
 997                         best_match = j;
 998                         match_level = 3;
 999                         break;
1000                 }
1001                 break;
1002         } while (basis_dir[++j] != NULL);
1003
1004         if (!match_level)
1005                 return -1;
1006
1007         if (j != best_match) {
1008                 j = best_match;
1009                 pathjoin(cmpbuf, MAXPATHLEN, basis_dir[j], fname);
1010                 if (link_stat(cmpbuf, &sxp->st, 0) < 0)
1011                         return -1;
1012         }
1013
1014         if (match_level == 3 && !copy_dest) {
1015 #ifdef SUPPORT_HARD_LINKS
1016                 if (link_dest) {
1017                         if (!hard_link_one(file, fname, cmpbuf, 1))
1018                                 goto try_a_copy;
1019                         if (preserve_hard_links && F_IS_HLINKED(file))
1020                                 finish_hard_link(file, fname, ndx, &sxp->st, itemizing, code, j);
1021                         if (!maybe_ATTRS_REPORT && (verbose > 1 || stdout_format_has_i > 1)) {
1022                                 itemize(cmpbuf, file, ndx, 1, sxp,
1023                                         ITEM_LOCAL_CHANGE | ITEM_XNAME_FOLLOWS,
1024                                         0, "");
1025                         }
1026                 } else
1027 #endif
1028                 if (itemizing)
1029                         itemize(cmpbuf, file, ndx, 0, sxp, 0, 0, NULL);
1030                 if (verbose > 1 && maybe_ATTRS_REPORT)
1031                         rprintf(FCLIENT, "%s is uptodate\n", fname);
1032                 return -2;
1033         }
1034
1035         if (match_level >= 2) {
1036 #ifdef SUPPORT_HARD_LINKS
1037           try_a_copy: /* Copy the file locally. */
1038 #endif
1039                 if (!dry_run && copy_altdest_file(cmpbuf, fname, file) < 0)
1040                         return -1;
1041                 if (itemizing)
1042                         itemize(cmpbuf, file, ndx, 0, sxp, ITEM_LOCAL_CHANGE, 0, NULL);
1043                 if (maybe_ATTRS_REPORT
1044                  && ((!itemizing && verbose && match_level == 2)
1045                   || (verbose > 1 && match_level == 3))) {
1046                         code = match_level == 3 ? FCLIENT : FINFO;
1047                         rprintf(code, "%s%s\n", fname,
1048                                 match_level == 3 ? " is uptodate" : "");
1049                 }
1050 #ifdef SUPPORT_HARD_LINKS
1051                 if (preserve_hard_links && F_IS_HLINKED(file))
1052                         finish_hard_link(file, fname, ndx, &sxp->st, itemizing, code, -1);
1053 #endif
1054                 return -2;
1055         }
1056
1057         return FNAMECMP_BASIS_DIR_LOW + j;
1058 }
1059
1060 /* This is only called for non-regular files.  We return -2 if we've finished
1061  * handling the file, or -1 if no dest-linking occurred, or a non-negative
1062  * value if we found an alternate basis file. */
1063 static int try_dests_non(struct file_struct *file, char *fname, int ndx,
1064                          char *cmpbuf, stat_x *sxp, int itemizing,
1065                          enum logcode code)
1066 {
1067         char lnk[MAXPATHLEN];
1068         int best_match = -1;
1069         int match_level = 0;
1070         enum nonregtype type;
1071         uint32 *devp;
1072         int len, j = 0;
1073
1074 #ifndef SUPPORT_LINKS
1075         if (S_ISLNK(file->mode))
1076                 return -1;
1077 #endif
1078         if (S_ISDIR(file->mode)) {
1079                 type = TYPE_DIR;
1080         } else if (IS_SPECIAL(file->mode))
1081                 type = TYPE_SPECIAL;
1082         else if (IS_DEVICE(file->mode))
1083                 type = TYPE_DEVICE;
1084 #ifdef SUPPORT_LINKS
1085         else if (S_ISLNK(file->mode))
1086                 type = TYPE_SYMLINK;
1087 #endif
1088         else {
1089                 rprintf(FERROR,
1090                         "internal: try_dests_non() called with invalid mode (%o)\n",
1091                         (int)file->mode);
1092                 exit_cleanup(RERR_UNSUPPORTED);
1093         }
1094
1095         do {
1096                 pathjoin(cmpbuf, MAXPATHLEN, basis_dir[j], fname);
1097                 if (link_stat(cmpbuf, &sxp->st, 0) < 0)
1098                         continue;
1099                 switch (type) {
1100                 case TYPE_DIR:
1101                         if (!S_ISDIR(sxp->st.st_mode))
1102                                 continue;
1103                         break;
1104                 case TYPE_SPECIAL:
1105                         if (!IS_SPECIAL(sxp->st.st_mode))
1106                                 continue;
1107                         break;
1108                 case TYPE_DEVICE:
1109                         if (!IS_DEVICE(sxp->st.st_mode))
1110                                 continue;
1111                         break;
1112 #ifdef SUPPORT_LINKS
1113                 case TYPE_SYMLINK:
1114                         if (!S_ISLNK(sxp->st.st_mode))
1115                                 continue;
1116                         break;
1117 #endif
1118                 }
1119                 if (match_level < 1) {
1120                         match_level = 1;
1121                         best_match = j;
1122                 }
1123                 switch (type) {
1124                 case TYPE_DIR:
1125                         break;
1126                 case TYPE_SPECIAL:
1127                 case TYPE_DEVICE:
1128                         devp = F_RDEV_P(file);
1129                         if (sxp->st.st_rdev != MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp)))
1130                                 continue;
1131                         break;
1132 #ifdef SUPPORT_LINKS
1133                 case TYPE_SYMLINK:
1134                         if ((len = readlink(cmpbuf, lnk, MAXPATHLEN-1)) <= 0)
1135                                 continue;
1136                         lnk[len] = '\0';
1137                         if (strcmp(lnk, F_SYMLINK(file)) != 0)
1138                                 continue;
1139                         break;
1140 #endif
1141                 }
1142                 if (match_level < 2) {
1143                         match_level = 2;
1144                         best_match = j;
1145                 }
1146                 if (unchanged_attrs(cmpbuf, file, sxp)) {
1147                         match_level = 3;
1148                         best_match = j;
1149                         break;
1150                 }
1151         } while (basis_dir[++j] != NULL);
1152
1153         if (!match_level)
1154                 return -1;
1155
1156         if (j != best_match) {
1157                 j = best_match;
1158                 pathjoin(cmpbuf, MAXPATHLEN, basis_dir[j], fname);
1159                 if (link_stat(cmpbuf, &sxp->st, 0) < 0)
1160                         return -1;
1161         }
1162
1163         if (match_level == 3) {
1164 #ifdef SUPPORT_HARD_LINKS
1165                 if (link_dest
1166 #ifndef CAN_HARDLINK_SYMLINK
1167                  && !S_ISLNK(file->mode)
1168 #endif
1169 #ifndef CAN_HARDLINK_SPECIAL
1170                  && !IS_SPECIAL(file->mode) && !IS_DEVICE(file->mode)
1171 #endif
1172                  && !S_ISDIR(file->mode)) {
1173                         if (do_link(cmpbuf, fname) < 0) {
1174                                 rsyserr(FERROR_XFER, errno,
1175                                         "failed to hard-link %s with %s",
1176                                         cmpbuf, fname);
1177                                 return j;
1178                         }
1179                         if (preserve_hard_links && F_IS_HLINKED(file))
1180                                 finish_hard_link(file, fname, ndx, NULL, itemizing, code, -1);
1181                 } else
1182 #endif
1183                         match_level = 2;
1184                 if (itemizing && stdout_format_has_i
1185                  && (verbose > 1 || stdout_format_has_i > 1)) {
1186                         int chg = compare_dest && type != TYPE_DIR ? 0
1187                             : ITEM_LOCAL_CHANGE + (match_level == 3 ? ITEM_XNAME_FOLLOWS : 0);
1188                         char *lp = match_level == 3 ? "" : NULL;
1189                         itemize(cmpbuf, file, ndx, 0, sxp, chg + ITEM_MATCHED, 0, lp);
1190                 }
1191                 if (verbose > 1 && maybe_ATTRS_REPORT) {
1192                         rprintf(FCLIENT, "%s%s is uptodate\n",
1193                                 fname, type == TYPE_DIR ? "/" : "");
1194                 }
1195                 return -2;
1196         }
1197
1198         return j;
1199 }
1200
1201 static void list_file_entry(struct file_struct *f)
1202 {
1203         char permbuf[PERMSTRING_SIZE];
1204         double len;
1205
1206         if (!F_IS_ACTIVE(f)) {
1207                 /* this can happen if duplicate names were removed */
1208                 return;
1209         }
1210
1211         permstring(permbuf, f->mode);
1212         len = F_LENGTH(f);
1213
1214         /* TODO: indicate '+' if the entry has an ACL. */
1215
1216 #ifdef SUPPORT_LINKS
1217         if (preserve_links && S_ISLNK(f->mode)) {
1218                 rprintf(FINFO, "%s %11.0f %s %s -> %s\n",
1219                         permbuf, len, timestring(f->modtime),
1220                         f_name(f, NULL), F_SYMLINK(f));
1221         } else
1222 #endif
1223         {
1224                 rprintf(FINFO, "%s %11.0f %s %s\n",
1225                         permbuf, len, timestring(f->modtime),
1226                         f_name(f, NULL));
1227         }
1228 }
1229
1230 static int phase = 0;
1231 static int dflt_perms;
1232
1233 static int implied_dirs_are_missing;
1234 /* Helper for recv_generator's skip_dir and dry_missing_dir tests. */
1235 static BOOL is_below(struct file_struct *file, struct file_struct *subtree)
1236 {
1237         return F_DEPTH(file) > F_DEPTH(subtree)
1238                 && (!implied_dirs_are_missing || f_name_has_prefix(file, subtree));
1239 }
1240
1241 /* Acts on the indicated item in cur_flist whose name is fname.  If a dir,
1242  * make sure it exists, and has the right permissions/timestamp info.  For
1243  * all other non-regular files (symlinks, etc.) we create them here.  For
1244  * regular files that have changed, we try to find a basis file and then
1245  * start sending checksums.  The ndx is the file's unique index value.
1246  *
1247  * The fname parameter must point to a MAXPATHLEN buffer!  (e.g it gets
1248  * passed to delete_item(), which can use it during a recursive delete.)
1249  *
1250  * Note that f_out is set to -1 when doing final directory-permission and
1251  * modification-time repair. */
1252 static void recv_generator(char *fname, struct file_struct *file, int ndx,
1253                            int itemizing, enum logcode code, int f_out)
1254 {
1255         static const char *parent_dirname = "";
1256         /* Missing dir not created due to --dry-run; will still be scanned. */
1257         static struct file_struct *dry_missing_dir = NULL;
1258         /* Missing dir whose contents are skipped altogether due to
1259          * --ignore-non-existing, daemon exclude, or mkdir failure. */
1260         static struct file_struct *skip_dir = NULL;
1261         static struct file_list *fuzzy_dirlist = NULL;
1262         static int need_fuzzy_dirlist = 0;
1263         struct file_struct *fuzzy_file = NULL;
1264         int fd = -1, f_copy = -1;
1265         stat_x sx, real_sx;
1266         STRUCT_STAT partial_st;
1267         struct file_struct *back_file = NULL;
1268         int statret, real_ret, stat_errno;
1269         char *fnamecmp, *partialptr, *backupptr = NULL;
1270         char fnamecmpbuf[MAXPATHLEN];
1271         uchar fnamecmp_type;
1272         int del_opts = delete_mode || force_delete ? DEL_RECURSE : 0;
1273         int is_dir = !S_ISDIR(file->mode) ? 0
1274                    : inc_recurse && ndx != cur_flist->ndx_start - 1 ? -1
1275                    : 1;
1276
1277         if (verbose > 2)
1278                 rprintf(FINFO, "recv_generator(%s,%d)\n", fname, ndx);
1279
1280         if (list_only) {
1281                 if (is_dir < 0
1282                  || (is_dir && !implied_dirs && file->flags & FLAG_IMPLIED_DIR))
1283                         return;
1284                 list_file_entry(file);
1285                 return;
1286         }
1287
1288         if (skip_dir) {
1289                 if (is_below(file, skip_dir)) {
1290                         if (is_dir)
1291                                 file->flags |= FLAG_MISSING_DIR;
1292 #ifdef SUPPORT_HARD_LINKS
1293                         else if (F_IS_HLINKED(file))
1294                                 handle_skipped_hlink(file, itemizing, code, f_out);
1295 #endif
1296                         return;
1297                 }
1298                 skip_dir = NULL;
1299         }
1300
1301         if (daemon_filter_list.head && (*fname != '.' || fname[1])) {
1302                 if (check_filter(&daemon_filter_list, FLOG, fname, is_dir) < 0) {
1303                         if (is_dir < 0)
1304                                 return;
1305 #ifdef SUPPORT_HARD_LINKS
1306                         if (F_IS_HLINKED(file))
1307                                 handle_skipped_hlink(file, itemizing, code, f_out);
1308 #endif
1309                         rprintf(FERROR_XFER,
1310                                 "skipping daemon-excluded %s \"%s\"\n",
1311                                 is_dir ? "directory" : "file", fname);
1312                         if (is_dir)
1313                                 goto skipping_dir_contents;
1314                         return;
1315                 }
1316         }
1317
1318 #ifdef SUPPORT_ACLS
1319         sx.acc_acl = sx.def_acl = NULL;
1320 #endif
1321 #ifdef SUPPORT_XATTRS
1322         sx.xattr = NULL;
1323 #endif
1324         if (dry_run > 1 || (dry_missing_dir && is_below(file, dry_missing_dir))) {
1325           parent_is_dry_missing:
1326                 if (fuzzy_dirlist) {
1327                         flist_free(fuzzy_dirlist);
1328                         fuzzy_dirlist = NULL;
1329                 }
1330                 parent_dirname = "";
1331                 statret = -1;
1332                 stat_errno = ENOENT;
1333         } else {
1334                 const char *dn = file->dirname ? file->dirname : ".";
1335                 dry_missing_dir = NULL;
1336                 if (parent_dirname != dn && strcmp(parent_dirname, dn) != 0) {
1337                         if (relative_paths && !implied_dirs
1338                          && do_stat(dn, &sx.st) < 0) {
1339                                 if (dry_run)
1340                                         goto parent_is_dry_missing;
1341                                 if (create_directory_path(fname) < 0) {
1342                                         rsyserr(FERROR_XFER, errno,
1343                                                 "recv_generator: mkdir %s failed",
1344                                                 full_fname(dn));
1345                                 }
1346                         }
1347                         if (fuzzy_dirlist) {
1348                                 flist_free(fuzzy_dirlist);
1349                                 fuzzy_dirlist = NULL;
1350                         }
1351                         if (fuzzy_basis)
1352                                 need_fuzzy_dirlist = 1;
1353 #ifdef SUPPORT_ACLS
1354                         if (!preserve_perms)
1355                                 dflt_perms = default_perms_for_dir(dn);
1356 #endif
1357                 }
1358                 parent_dirname = dn;
1359
1360                 if (need_fuzzy_dirlist && S_ISREG(file->mode)) {
1361                         strlcpy(fnamecmpbuf, dn, sizeof fnamecmpbuf);
1362                         fuzzy_dirlist = get_dirlist(fnamecmpbuf, -1, 1);
1363                         need_fuzzy_dirlist = 0;
1364                 }
1365
1366                 statret = link_stat(fname, &sx.st, keep_dirlinks && is_dir);
1367                 stat_errno = errno;
1368         }
1369
1370         if (ignore_non_existing > 0 && statret == -1 && stat_errno == ENOENT) {
1371                 if (is_dir) {
1372                         if (is_dir < 0)
1373                                 return;
1374                         skip_dir = file;
1375                         file->flags |= FLAG_MISSING_DIR;
1376                 }
1377 #ifdef SUPPORT_HARD_LINKS
1378                 else if (F_IS_HLINKED(file))
1379                         handle_skipped_hlink(file, itemizing, code, f_out);
1380 #endif
1381                 if (verbose > 1) {
1382                         rprintf(FINFO, "not creating new %s \"%s\"\n",
1383                                 is_dir ? "directory" : "file", fname);
1384                 }
1385                 return;
1386         }
1387
1388         if (statret == 0 && !(sx.st.st_mode & S_IWUSR)
1389          && !am_root && sx.st.st_uid == our_uid)
1390                 del_opts |= DEL_NO_UID_WRITE;
1391
1392         if (ignore_existing > 0 && statret == 0
1393          && (!is_dir || !S_ISDIR(sx.st.st_mode))) {
1394                 if (verbose > 1 && is_dir >= 0)
1395                         rprintf(FINFO, "%s exists\n", fname);
1396 #ifdef SUPPORT_HARD_LINKS
1397                 if (F_IS_HLINKED(file))
1398                         handle_skipped_hlink(file, itemizing, code, f_out);
1399 #endif
1400                 goto cleanup;
1401         }
1402
1403         if (is_dir) {
1404                 if (!implied_dirs && file->flags & FLAG_IMPLIED_DIR)
1405                         goto cleanup;
1406                 if (is_dir < 0) {
1407                         /* In inc_recurse mode we want to make sure any missing
1408                          * directories get created while we're still processing
1409                          * the parent dir (which allows us to touch the parent
1410                          * dir's mtime right away).  We will handle the dir in
1411                          * full later (right before we handle its contents). */
1412                         if (statret == 0
1413                          && (S_ISDIR(sx.st.st_mode)
1414                           || delete_item(fname, sx.st.st_mode, del_opts | DEL_FOR_DIR) != 0))
1415                                 goto cleanup; /* Any errors get reported later. */
1416                         if (do_mkdir(fname, file->mode & 0700) == 0)
1417                                 file->flags |= FLAG_DIR_CREATED;
1418                         goto cleanup;
1419                 }
1420                 /* The file to be received is a directory, so we need
1421                  * to prepare appropriately.  If there is already a
1422                  * file of that name and it is *not* a directory, then
1423                  * we need to delete it.  If it doesn't exist, then
1424                  * (perhaps recursively) create it. */
1425                 if (statret == 0 && !S_ISDIR(sx.st.st_mode)) {
1426                         if (delete_item(fname, sx.st.st_mode, del_opts | DEL_FOR_DIR) != 0)
1427                                 goto skipping_dir_contents;
1428                         statret = -1;
1429                 }
1430                 if (dry_run && statret != 0) {
1431                         if (!dry_missing_dir)
1432                                 dry_missing_dir = file;
1433                         file->flags |= FLAG_MISSING_DIR;
1434                 }
1435                 real_ret = statret;
1436                 real_sx = sx;
1437                 if (file->flags & FLAG_DIR_CREATED)
1438                         statret = -1;
1439                 if (!preserve_perms) { /* See comment in non-dir code below. */
1440                         file->mode = dest_mode(file->mode, sx.st.st_mode,
1441                                                dflt_perms, statret == 0);
1442                 }
1443                 if (statret != 0 && basis_dir[0] != NULL) {
1444                         int j = try_dests_non(file, fname, ndx, fnamecmpbuf, &sx,
1445                                               itemizing, code);
1446                         if (j == -2) {
1447                                 itemizing = 0;
1448                                 code = FNONE;
1449                                 statret = 1;
1450                         } else if (j >= 0)
1451                                 statret = 1;
1452                 }
1453                 if (itemizing && f_out != -1) {
1454                         itemize(fname, file, ndx, statret, &sx,
1455                                 statret ? ITEM_LOCAL_CHANGE : 0, 0, NULL);
1456                 }
1457                 if (real_ret != 0 && do_mkdir(fname,file->mode) < 0 && errno != EEXIST) {
1458                         if (!relative_paths || errno != ENOENT
1459                             || create_directory_path(fname) < 0
1460                             || (do_mkdir(fname, file->mode) < 0 && errno != EEXIST)) {
1461                                 rsyserr(FERROR_XFER, errno,
1462                                         "recv_generator: mkdir %s failed",
1463                                         full_fname(fname));
1464                           skipping_dir_contents:
1465                                 rprintf(FERROR,
1466                                     "*** Skipping any contents from this failed directory ***\n");
1467                                 skip_dir = file;
1468                                 file->flags |= FLAG_MISSING_DIR;
1469                                 goto cleanup;
1470                         }
1471                 }
1472 #ifdef SUPPORT_XATTRS
1473                 if (preserve_xattrs && statret == 1)
1474                         copy_xattrs(fnamecmpbuf, fname);
1475 #endif
1476                 if (set_file_attrs(fname, file, real_ret ? NULL : &real_sx, NULL, 0)
1477                     && verbose && code != FNONE && f_out != -1)
1478                         rprintf(code, "%s/\n", fname);
1479
1480                 /* We need to ensure that the dirs in the transfer have writable
1481                  * permissions during the time we are putting files within them.
1482                  * This is then fixed after the transfer is done. */
1483 #ifdef HAVE_CHMOD
1484                 if (!am_root && !(file->mode & S_IWUSR) && dir_tweaking) {
1485                         mode_t mode = file->mode | S_IWUSR;
1486                         if (do_chmod(fname, mode) < 0) {
1487                                 rsyserr(FERROR_XFER, errno,
1488                                         "failed to modify permissions on %s",
1489                                         full_fname(fname));
1490                         }
1491                         need_retouch_dir_perms = 1;
1492                 }
1493 #endif
1494
1495                 if (real_ret != 0 && one_file_system)
1496                         real_sx.st.st_dev = filesystem_dev;
1497                 if (inc_recurse) {
1498                         if (one_file_system) {
1499                                 uint32 *devp = F_DIR_DEV_P(file);
1500                                 DEV_MAJOR(devp) = major(real_sx.st.st_dev);
1501                                 DEV_MINOR(devp) = minor(real_sx.st.st_dev);
1502                         }
1503                 }
1504                 else if (delete_during && f_out != -1 && !phase
1505                     && !(file->flags & FLAG_MISSING_DIR)) {
1506                         if (file->flags & FLAG_CONTENT_DIR)
1507                                 delete_in_dir(fname, file, &real_sx.st.st_dev);
1508                         else
1509                                 change_local_filter_dir(fname, strlen(fname), F_DEPTH(file));
1510                 }
1511                 goto cleanup;
1512         }
1513
1514         /* If we're not preserving permissions, change the file-list's
1515          * mode based on the local permissions and some heuristics. */
1516         if (!preserve_perms) {
1517                 int exists = statret == 0 && !S_ISDIR(sx.st.st_mode);
1518                 file->mode = dest_mode(file->mode, sx.st.st_mode, dflt_perms,
1519                                        exists);
1520         }
1521
1522 #ifdef SUPPORT_HARD_LINKS
1523         if (preserve_hard_links && F_HLINK_NOT_FIRST(file)
1524          && hard_link_check(file, ndx, fname, statret, &sx, itemizing, code))
1525                 goto cleanup;
1526 #endif
1527
1528         if (preserve_links && S_ISLNK(file->mode)) {
1529 #ifdef SUPPORT_LINKS
1530                 const char *sl = F_SYMLINK(file);
1531                 if (safe_symlinks && unsafe_symlink(sl, fname)) {
1532                         if (verbose) {
1533                                 if (solo_file)
1534                                         fname = f_name(file, NULL);
1535                                 rprintf(FINFO,
1536                                         "ignoring unsafe symlink %s -> \"%s\"\n",
1537                                         full_fname(fname), sl);
1538                         }
1539                         return;
1540                 }
1541                 if (statret == 0) {
1542                         char lnk[MAXPATHLEN];
1543                         int len;
1544
1545                         if (!S_ISLNK(sx.st.st_mode))
1546                                 statret = -1;
1547                         else if ((len = readlink(fname, lnk, MAXPATHLEN-1)) > 0
1548                               && strncmp(lnk, sl, len) == 0 && sl[len] == '\0') {
1549                                 /* The link is pointing to the right place. */
1550                                 set_file_attrs(fname, file, &sx, NULL, maybe_ATTRS_REPORT);
1551                                 if (itemizing)
1552                                         itemize(fname, file, ndx, 0, &sx, 0, 0, NULL);
1553 #if defined SUPPORT_HARD_LINKS && defined CAN_HARDLINK_SYMLINK
1554                                 if (preserve_hard_links && F_IS_HLINKED(file))
1555                                         finish_hard_link(file, fname, ndx, &sx.st, itemizing, code, -1);
1556 #endif
1557                                 if (remove_source_files == 1)
1558                                         goto return_with_success;
1559                                 goto cleanup;
1560                         }
1561                         /* Not the right symlink (or not a symlink), so
1562                          * delete it. */
1563                         if (delete_item(fname, sx.st.st_mode, del_opts | DEL_FOR_SYMLINK) != 0)
1564                                 goto cleanup;
1565                 } else if (basis_dir[0] != NULL) {
1566                         int j = try_dests_non(file, fname, ndx, fnamecmpbuf, &sx,
1567                                               itemizing, code);
1568                         if (j == -2) {
1569 #ifndef CAN_HARDLINK_SYMLINK
1570                                 if (link_dest) {
1571                                         /* Resort to --copy-dest behavior. */
1572                                 } else
1573 #endif
1574                                 if (!copy_dest)
1575                                         goto cleanup;
1576                                 itemizing = 0;
1577                                 code = FNONE;
1578                         } else if (j >= 0)
1579                                 statret = 1;
1580                 }
1581 #ifdef SUPPORT_HARD_LINKS
1582                 if (preserve_hard_links && F_HLINK_NOT_LAST(file)) {
1583                         cur_flist->in_progress++;
1584                         goto cleanup;
1585                 }
1586 #endif
1587                 if (do_symlink(sl, fname) != 0) {
1588                         rsyserr(FERROR_XFER, errno, "symlink %s -> \"%s\" failed",
1589                                 full_fname(fname), sl);
1590                 } else {
1591                         set_file_attrs(fname, file, NULL, NULL, 0);
1592                         if (itemizing) {
1593                                 itemize(fname, file, ndx, statret, &sx,
1594                                         ITEM_LOCAL_CHANGE|ITEM_REPORT_CHANGE, 0, NULL);
1595                         }
1596                         if (code != FNONE && verbose)
1597                                 rprintf(code, "%s -> %s\n", fname, sl);
1598 #ifdef SUPPORT_HARD_LINKS
1599                         if (preserve_hard_links && F_IS_HLINKED(file))
1600                                 finish_hard_link(file, fname, ndx, NULL, itemizing, code, -1);
1601 #endif
1602                         /* This does not check remove_source_files == 1
1603                          * because this is one of the items that the old
1604                          * --remove-sent-files option would remove. */
1605                         if (remove_source_files)
1606                                 goto return_with_success;
1607                 }
1608 #endif
1609                 goto cleanup;
1610         }
1611
1612         if ((am_root && preserve_devices && IS_DEVICE(file->mode))
1613          || (preserve_specials && IS_SPECIAL(file->mode))) {
1614                 uint32 *devp = F_RDEV_P(file);
1615                 dev_t rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp));
1616                 if (statret == 0) {
1617                         int del_for_flag;
1618                         if (IS_DEVICE(file->mode)) {
1619                                 if (!IS_DEVICE(sx.st.st_mode))
1620                                         statret = -1;
1621                                 del_for_flag = DEL_FOR_DEVICE;
1622                         } else {
1623                                 if (!IS_SPECIAL(sx.st.st_mode))
1624                                         statret = -1;
1625                                 del_for_flag = DEL_FOR_SPECIAL;
1626                         }
1627                         if (statret == 0
1628                          && BITS_EQUAL(sx.st.st_mode, file->mode, _S_IFMT)
1629                          && sx.st.st_rdev == rdev) {
1630                                 /* The device or special file is identical. */
1631                                 set_file_attrs(fname, file, &sx, NULL, maybe_ATTRS_REPORT);
1632                                 if (itemizing)
1633                                         itemize(fname, file, ndx, 0, &sx, 0, 0, NULL);
1634 #ifdef SUPPORT_HARD_LINKS
1635                                 if (preserve_hard_links && F_IS_HLINKED(file))
1636                                         finish_hard_link(file, fname, ndx, &sx.st, itemizing, code, -1);
1637 #endif
1638                                 if (remove_source_files == 1)
1639                                         goto return_with_success;
1640                                 goto cleanup;
1641                         }
1642                         if (delete_item(fname, sx.st.st_mode, del_opts | del_for_flag) != 0)
1643                                 goto cleanup;
1644                 } else if (basis_dir[0] != NULL) {
1645                         int j = try_dests_non(file, fname, ndx, fnamecmpbuf, &sx,
1646                                               itemizing, code);
1647                         if (j == -2) {
1648 #ifndef CAN_HARDLINK_SPECIAL
1649                                 if (link_dest) {
1650                                         /* Resort to --copy-dest behavior. */
1651                                 } else
1652 #endif
1653                                 if (!copy_dest)
1654                                         goto cleanup;
1655                                 itemizing = 0;
1656                                 code = FNONE;
1657                         } else if (j >= 0)
1658                                 statret = 1;
1659                 }
1660 #ifdef SUPPORT_HARD_LINKS
1661                 if (preserve_hard_links && F_HLINK_NOT_LAST(file)) {
1662                         cur_flist->in_progress++;
1663                         goto cleanup;
1664                 }
1665 #endif
1666                 if (verbose > 2) {
1667                         rprintf(FINFO, "mknod(%s, 0%o, [%ld,%ld])\n",
1668                                 fname, (int)file->mode,
1669                                 (long)major(rdev), (long)minor(rdev));
1670                 }
1671                 if (do_mknod(fname, file->mode, rdev) < 0) {
1672                         rsyserr(FERROR_XFER, errno, "mknod %s failed",
1673                                 full_fname(fname));
1674                 } else {
1675                         set_file_attrs(fname, file, NULL, NULL, 0);
1676                         if (itemizing) {
1677                                 itemize(fname, file, ndx, statret, &sx,
1678                                         ITEM_LOCAL_CHANGE|ITEM_REPORT_CHANGE, 0, NULL);
1679                         }
1680                         if (code != FNONE && verbose)
1681                                 rprintf(code, "%s\n", fname);
1682 #ifdef SUPPORT_HARD_LINKS
1683                         if (preserve_hard_links && F_IS_HLINKED(file))
1684                                 finish_hard_link(file, fname, ndx, NULL, itemizing, code, -1);
1685 #endif
1686                         if (remove_source_files == 1)
1687                                 goto return_with_success;
1688                 }
1689                 goto cleanup;
1690         }
1691
1692         if (!S_ISREG(file->mode)) {
1693                 if (solo_file)
1694                         fname = f_name(file, NULL);
1695                 rprintf(FINFO, "skipping non-regular file \"%s\"\n", fname);
1696                 goto cleanup;
1697         }
1698
1699         if (max_size > 0 && F_LENGTH(file) > max_size) {
1700                 if (verbose > 1) {
1701                         if (solo_file)
1702                                 fname = f_name(file, NULL);
1703                         rprintf(FINFO, "%s is over max-size\n", fname);
1704                 }
1705                 goto cleanup;
1706         }
1707         if (min_size > 0 && F_LENGTH(file) < min_size) {
1708                 if (verbose > 1) {
1709                         if (solo_file)
1710                                 fname = f_name(file, NULL);
1711                         rprintf(FINFO, "%s is under min-size\n", fname);
1712                 }
1713                 goto cleanup;
1714         }
1715
1716         if (update_only > 0 && statret == 0
1717             && cmp_time(sx.st.st_mtime, file->modtime) > 0) {
1718                 if (verbose > 1)
1719                         rprintf(FINFO, "%s is newer\n", fname);
1720 #ifdef SUPPORT_HARD_LINKS
1721                 if (F_IS_HLINKED(file))
1722                         handle_skipped_hlink(file, itemizing, code, f_out);
1723 #endif
1724                 goto cleanup;
1725         }
1726
1727         fnamecmp = fname;
1728         fnamecmp_type = FNAMECMP_FNAME;
1729
1730         if (statret == 0 && !S_ISREG(sx.st.st_mode)) {
1731                 if (delete_item(fname, sx.st.st_mode, del_opts | DEL_FOR_FILE) != 0)
1732                         goto cleanup;
1733                 statret = -1;
1734                 stat_errno = ENOENT;
1735         }
1736
1737         if (statret != 0 && basis_dir[0] != NULL) {
1738                 int j = try_dests_reg(file, fname, ndx, fnamecmpbuf, &sx,
1739                                       itemizing, code);
1740                 if (j == -2) {
1741                         if (remove_source_files == 1)
1742                                 goto return_with_success;
1743                         goto cleanup;
1744                 }
1745                 if (j >= 0) {
1746                         fnamecmp = fnamecmpbuf;
1747                         fnamecmp_type = j;
1748                         statret = 0;
1749                 }
1750         }
1751
1752         real_ret = statret;
1753         real_sx = sx;
1754
1755         if (partial_dir && (partialptr = partial_dir_fname(fname)) != NULL
1756             && link_stat(partialptr, &partial_st, 0) == 0
1757             && S_ISREG(partial_st.st_mode)) {
1758                 if (statret != 0)
1759                         goto prepare_to_open;
1760         } else
1761                 partialptr = NULL;
1762
1763         if (statret != 0 && fuzzy_dirlist) {
1764                 int j = find_fuzzy(file, fuzzy_dirlist);
1765                 if (j >= 0) {
1766                         fuzzy_file = fuzzy_dirlist->files[j];
1767                         f_name(fuzzy_file, fnamecmpbuf);
1768                         if (verbose > 2) {
1769                                 rprintf(FINFO, "fuzzy basis selected for %s: %s\n",
1770                                         fname, fnamecmpbuf);
1771                         }
1772                         sx.st.st_size = F_LENGTH(fuzzy_file);
1773                         statret = 0;
1774                         fnamecmp = fnamecmpbuf;
1775                         fnamecmp_type = FNAMECMP_FUZZY;
1776                 }
1777         }
1778
1779         if (statret != 0) {
1780 #ifdef SUPPORT_HARD_LINKS
1781                 if (preserve_hard_links && F_HLINK_NOT_LAST(file)) {
1782                         cur_flist->in_progress++;
1783                         goto cleanup;
1784                 }
1785 #endif
1786                 if (stat_errno == ENOENT)
1787                         goto notify_others;
1788                 rsyserr(FERROR_XFER, stat_errno, "recv_generator: failed to stat %s",
1789                         full_fname(fname));
1790                 goto cleanup;
1791         }
1792
1793         if (fnamecmp_type <= FNAMECMP_BASIS_DIR_HIGH)
1794                 ;
1795         else if (fnamecmp_type == FNAMECMP_FUZZY)
1796                 ;
1797         else if (unchanged_file(fnamecmp, file, &sx.st)) {
1798                 if (partialptr) {
1799                         do_unlink(partialptr);
1800                         handle_partial_dir(partialptr, PDIR_DELETE);
1801                 }
1802                 set_file_attrs(fname, file, &sx, NULL, maybe_ATTRS_REPORT);
1803                 if (itemizing)
1804                         itemize(fnamecmp, file, ndx, statret, &sx, 0, 0, NULL);
1805 #ifdef SUPPORT_HARD_LINKS
1806                 if (preserve_hard_links && F_IS_HLINKED(file))
1807                         finish_hard_link(file, fname, ndx, &sx.st, itemizing, code, -1);
1808 #endif
1809                 if (remove_source_files != 1)
1810                         goto cleanup;
1811           return_with_success:
1812                 if (!dry_run)
1813                         send_msg_int(MSG_SUCCESS, ndx);
1814                 goto cleanup;
1815         }
1816
1817         if (append_mode > 0 && sx.st.st_size >= F_LENGTH(file)) {
1818 #ifdef SUPPORT_HARD_LINKS
1819                 if (F_IS_HLINKED(file))
1820                         handle_skipped_hlink(file, itemizing, code, f_out);
1821 #endif
1822                 goto cleanup;
1823         }
1824
1825   prepare_to_open:
1826         if (partialptr) {
1827                 sx.st = partial_st;
1828                 fnamecmp = partialptr;
1829                 fnamecmp_type = FNAMECMP_PARTIAL_DIR;
1830                 statret = 0;
1831         }
1832
1833         if (!do_xfers)
1834                 goto notify_others;
1835
1836         if (read_batch || whole_file) {
1837                 if (inplace && make_backups > 0 && fnamecmp_type == FNAMECMP_FNAME) {
1838                         if (!(backupptr = get_backup_name(fname)))
1839                                 goto cleanup;
1840                         if (!(back_file = make_file(fname, NULL, NULL, 0, NO_FILTERS)))
1841                                 goto pretend_missing;
1842                         if (copy_file(fname, backupptr, -1, back_file->mode, 1) < 0) {
1843                                 unmake_file(back_file);
1844                                 back_file = NULL;
1845                                 goto cleanup;
1846                         }
1847                 }
1848                 goto notify_others;
1849         }
1850
1851         if (fuzzy_dirlist) {
1852                 int j = flist_find(fuzzy_dirlist, file);
1853                 if (j >= 0) /* don't use changing file as future fuzzy basis */
1854                         fuzzy_dirlist->files[j]->flags |= FLAG_FILE_SENT;
1855         }
1856
1857         /* open the file */
1858         if ((fd = do_open(fnamecmp, O_RDONLY, 0)) < 0) {
1859                 rsyserr(FERROR, errno, "failed to open %s, continuing",
1860                         full_fname(fnamecmp));
1861           pretend_missing:
1862                 /* pretend the file didn't exist */
1863 #ifdef SUPPORT_HARD_LINKS
1864                 if (preserve_hard_links && F_HLINK_NOT_LAST(file)) {
1865                         cur_flist->in_progress++;
1866                         goto cleanup;
1867                 }
1868 #endif
1869                 statret = real_ret = -1;
1870                 goto notify_others;
1871         }
1872
1873         if (inplace && make_backups > 0 && fnamecmp_type == FNAMECMP_FNAME) {
1874                 if (!(backupptr = get_backup_name(fname))) {
1875                         close(fd);
1876                         goto cleanup;
1877                 }
1878                 if (!(back_file = make_file(fname, NULL, NULL, 0, NO_FILTERS))) {
1879                         close(fd);
1880                         goto pretend_missing;
1881                 }
1882                 if (robust_unlink(backupptr) && errno != ENOENT) {
1883                         rsyserr(FERROR_XFER, errno, "unlink %s",
1884                                 full_fname(backupptr));
1885                         unmake_file(back_file);
1886                         back_file = NULL;
1887                         close(fd);
1888                         goto cleanup;
1889                 }
1890                 if ((f_copy = do_open(backupptr, O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0600)) < 0) {
1891                         int save_errno = errno ? errno : EINVAL; /* 0 paranoia */
1892                         if (errno == ENOENT && make_bak_dir(backupptr) == 0) {
1893                                 if ((f_copy = do_open(backupptr, O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0600)) < 0)
1894                                         save_errno = errno ? errno : save_errno;
1895                                 else
1896                                         save_errno = 0;
1897                         }
1898                         if (save_errno) {
1899                                 rsyserr(FERROR_XFER, save_errno, "open %s", full_fname(backupptr));
1900                                 unmake_file(back_file);
1901                                 back_file = NULL;
1902                                 close(fd);
1903                                 goto cleanup;
1904                         }
1905                 }
1906                 fnamecmp_type = FNAMECMP_BACKUP;
1907         }
1908
1909         if (verbose > 3) {
1910                 rprintf(FINFO, "gen mapped %s of size %.0f\n",
1911                         fnamecmp, (double)sx.st.st_size);
1912         }
1913
1914         if (verbose > 2)
1915                 rprintf(FINFO, "generating and sending sums for %d\n", ndx);
1916
1917   notify_others:
1918         if (remove_source_files && !delay_updates && !phase && !dry_run)
1919                 increment_active_files(ndx, itemizing, code);
1920         if (inc_recurse && !dry_run)
1921                 cur_flist->in_progress++;
1922 #ifdef SUPPORT_HARD_LINKS
1923         if (preserve_hard_links && F_IS_HLINKED(file))
1924                 file->flags |= FLAG_FILE_SENT;
1925 #endif
1926         write_ndx(f_out, ndx);
1927         if (itemizing) {
1928                 int iflags = ITEM_TRANSFER;
1929                 if (always_checksum > 0)
1930                         iflags |= ITEM_REPORT_CHANGE;
1931                 if (fnamecmp_type != FNAMECMP_FNAME)
1932                         iflags |= ITEM_BASIS_TYPE_FOLLOWS;
1933                 if (fnamecmp_type == FNAMECMP_FUZZY)
1934                         iflags |= ITEM_XNAME_FOLLOWS;
1935                 itemize(fnamecmp, file, -1, real_ret, &real_sx, iflags, fnamecmp_type,
1936                         fuzzy_file ? fuzzy_file->basename : NULL);
1937 #ifdef SUPPORT_ACLS
1938                 if (preserve_acls)
1939                         free_acl(&real_sx);
1940 #endif
1941 #ifdef SUPPORT_XATTRS
1942                 if (preserve_xattrs)
1943                         free_xattr(&real_sx);
1944 #endif
1945         }
1946
1947         if (!do_xfers) {
1948 #ifdef SUPPORT_HARD_LINKS
1949                 if (preserve_hard_links && F_IS_HLINKED(file))
1950                         finish_hard_link(file, fname, ndx, &sx.st, itemizing, code, -1);
1951 #endif
1952                 goto cleanup;
1953         }
1954         if (read_batch)
1955                 goto cleanup;
1956
1957         if (statret != 0 || whole_file)
1958                 write_sum_head(f_out, NULL);
1959         else if (sx.st.st_size <= 0) {
1960                 write_sum_head(f_out, NULL);
1961                 close(fd);
1962         } else {
1963                 if (generate_and_send_sums(fd, sx.st.st_size, f_out, f_copy) < 0) {
1964                         rprintf(FWARNING,
1965                             "WARNING: file is too large for checksum sending: %s\n",
1966                             fnamecmp);
1967                         write_sum_head(f_out, NULL);
1968                 }
1969                 close(fd);
1970         }
1971
1972   cleanup:
1973         if (back_file) {
1974                 int save_preserve_xattrs = preserve_xattrs;
1975                 if (f_copy >= 0)
1976                         close(f_copy);
1977 #ifdef SUPPORT_XATTRS
1978                 if (preserve_xattrs) {
1979                         copy_xattrs(fname, backupptr);
1980                         preserve_xattrs = 0;
1981                 }
1982 #endif
1983                 set_file_attrs(backupptr, back_file, NULL, NULL, 0);
1984                 preserve_xattrs = save_preserve_xattrs;
1985                 if (verbose > 1) {
1986                         rprintf(FINFO, "backed up %s to %s\n",
1987                                 fname, backupptr);
1988                 }
1989                 unmake_file(back_file);
1990         }
1991
1992 #ifdef SUPPORT_ACLS
1993         if (preserve_acls)
1994                 free_acl(&sx);
1995 #endif
1996 #ifdef SUPPORT_XATTRS
1997         if (preserve_xattrs)
1998                 free_xattr(&sx);
1999 #endif
2000         return;
2001 }
2002
2003 #ifdef SUPPORT_HARD_LINKS
2004 static void handle_skipped_hlink(struct file_struct *file, int itemizing,
2005                                  enum logcode code, int f_out)
2006 {
2007         char fbuf[MAXPATHLEN];
2008         int new_last_ndx;
2009         struct file_list *save_flist = cur_flist;
2010
2011         /* If we skip the last item in a chain of links and there was a
2012          * prior non-skipped hard-link waiting to finish, finish it now. */
2013         if ((new_last_ndx = skip_hard_link(file, &cur_flist)) < 0)
2014                 return;
2015
2016         file = cur_flist->files[new_last_ndx - cur_flist->ndx_start];
2017         cur_flist->in_progress--; /* undo prior increment */
2018         f_name(file, fbuf);
2019         recv_generator(fbuf, file, new_last_ndx, itemizing, code, f_out);
2020
2021         cur_flist = save_flist;
2022 }
2023 #endif
2024
2025 static void touch_up_dirs(struct file_list *flist, int ndx)
2026 {
2027         static int counter = 0;
2028         struct file_struct *file;
2029         char *fname;
2030         int i, start, end;
2031
2032         if (ndx < 0) {
2033                 start = 0;
2034                 end = flist->used - 1;
2035         } else
2036                 start = end = ndx;
2037
2038         /* Fix any directory permissions that were modified during the
2039          * transfer and/or re-set any tweaked modified-time values. */
2040         for (i = start; i <= end; i++, counter++) {
2041                 file = flist->files[i];
2042                 if (!S_ISDIR(file->mode)
2043                  || (!implied_dirs && file->flags & FLAG_IMPLIED_DIR))
2044                         continue;
2045                 if (verbose > 3) {
2046                         fname = f_name(file, NULL);
2047                         rprintf(FINFO, "touch_up_dirs: %s (%d)\n",
2048                                 NS(fname), i);
2049                 }
2050                 if (!F_IS_ACTIVE(file) || file->flags & FLAG_MISSING_DIR
2051                  || (!need_retouch_dir_times && file->mode & S_IWUSR))
2052                         continue;
2053                 fname = f_name(file, NULL);
2054                 if (!(file->mode & S_IWUSR))
2055                         do_chmod(fname, file->mode);
2056                 if (need_retouch_dir_times) {
2057                         STRUCT_STAT st;
2058                         if (link_stat(fname, &st, 0) == 0
2059                          && cmp_time(st.st_mtime, file->modtime) != 0)
2060                                 set_modtime(fname, file->modtime, file->mode);
2061                 }
2062                 if (counter >= loopchk_limit) {
2063                         if (allowed_lull)
2064                                 maybe_send_keepalive();
2065                         else
2066                                 maybe_flush_socket(0);
2067                         counter = 0;
2068                 }
2069         }
2070 }
2071
2072 void check_for_finished_files(int itemizing, enum logcode code, int check_redo)
2073 {
2074         struct file_struct *file;
2075         struct file_list *flist;
2076         char fbuf[MAXPATHLEN];
2077         int ndx;
2078
2079         while (1) {
2080 #ifdef SUPPORT_HARD_LINKS
2081                 if (preserve_hard_links && (ndx = get_hlink_num()) != -1) {
2082                         flist = flist_for_ndx(ndx, "check_for_finished_files.1");
2083                         file = flist->files[ndx - flist->ndx_start];
2084                         assert(file->flags & FLAG_HLINKED);
2085                         finish_hard_link(file, f_name(file, fbuf), ndx, NULL, itemizing, code, -1);
2086                         flist->in_progress--;
2087                         continue;
2088                 }
2089 #endif
2090
2091                 if (check_redo && (ndx = get_redo_num()) != -1) {
2092                         csum_length = SUM_LENGTH;
2093                         max_size = -max_size;
2094                         min_size = -min_size;
2095                         ignore_existing = -ignore_existing;
2096                         ignore_non_existing = -ignore_non_existing;
2097                         update_only = -update_only;
2098                         always_checksum = -always_checksum;
2099                         size_only = -size_only;
2100                         append_mode = -append_mode;
2101                         make_backups = -make_backups; /* avoid dup backup w/inplace */
2102                         ignore_times++;
2103
2104                         flist = cur_flist;
2105                         cur_flist = flist_for_ndx(ndx, "check_for_finished_files.2");
2106
2107                         file = cur_flist->files[ndx - cur_flist->ndx_start];
2108                         if (solo_file)
2109                                 strlcpy(fbuf, solo_file, sizeof fbuf);
2110                         else
2111                                 f_name(file, fbuf);
2112                         recv_generator(fbuf, file, ndx, itemizing, code, sock_f_out);
2113                         cur_flist->to_redo--;
2114
2115                         cur_flist = flist;
2116
2117                         csum_length = SHORT_SUM_LENGTH;
2118                         max_size = -max_size;
2119                         min_size = -min_size;
2120                         ignore_existing = -ignore_existing;
2121                         ignore_non_existing = -ignore_non_existing;
2122                         update_only = -update_only;
2123                         always_checksum = -always_checksum;
2124                         size_only = -size_only;
2125                         append_mode = -append_mode;
2126                         make_backups = -make_backups;
2127                         ignore_times--;
2128                         continue;
2129                 }
2130
2131                 if (cur_flist == first_flist)
2132                         break;
2133
2134                 /* We only get here if inc_recurse is enabled. */
2135                 if (first_flist->in_progress || first_flist->to_redo)
2136                         break;
2137
2138                 if (!read_batch) {
2139                         write_ndx(sock_f_out, NDX_DONE);
2140                         maybe_flush_socket(1);
2141                 }
2142
2143                 if (delete_during == 2 || !dir_tweaking) {
2144                         /* Skip directory touch-up. */
2145                 } else if (first_flist->parent_ndx >= 0)
2146                         touch_up_dirs(dir_flist, first_flist->parent_ndx);
2147
2148                 flist_free(first_flist); /* updates first_flist */
2149         }
2150 }
2151
2152 void generate_files(int f_out, const char *local_name)
2153 {
2154         int i, ndx, next_loopchk = 0;
2155         char fbuf[MAXPATHLEN];
2156         int itemizing;
2157         enum logcode code;
2158         int save_do_progress = do_progress;
2159
2160         if (protocol_version >= 29) {
2161                 itemizing = 1;
2162                 maybe_ATTRS_REPORT = stdout_format_has_i ? 0 : ATTRS_REPORT;
2163                 code = logfile_format_has_i ? FNONE : FLOG;
2164         } else if (am_daemon) {
2165                 itemizing = logfile_format_has_i && do_xfers;
2166                 maybe_ATTRS_REPORT = ATTRS_REPORT;
2167                 code = itemizing || !do_xfers ? FCLIENT : FINFO;
2168         } else if (!am_server) {
2169                 itemizing = stdout_format_has_i;
2170                 maybe_ATTRS_REPORT = stdout_format_has_i ? 0 : ATTRS_REPORT;
2171                 code = itemizing ? FNONE : FINFO;
2172         } else {
2173                 itemizing = 0;
2174                 maybe_ATTRS_REPORT = ATTRS_REPORT;
2175                 code = FINFO;
2176         }
2177         solo_file = local_name;
2178         dir_tweaking = !(list_only || solo_file || dry_run);
2179         need_retouch_dir_times = preserve_times > 1;
2180         loopchk_limit = allowed_lull ? allowed_lull * 5 : 200;
2181         symlink_timeset_failed_flags = ITEM_REPORT_TIME
2182             | (protocol_version >= 30 || !am_server ? ITEM_REPORT_TIMEFAIL : 0);
2183         implied_dirs_are_missing = relative_paths && !implied_dirs && protocol_version < 30;
2184
2185         if (verbose > 2)
2186                 rprintf(FINFO, "generator starting pid=%ld\n", (long)getpid());
2187
2188         if (delete_before && !solo_file && cur_flist->used > 0)
2189                 do_delete_pass();
2190         if (delete_during == 2) {
2191                 deldelay_size = BIGPATHBUFLEN * 4;
2192                 deldelay_buf = new_array(char, deldelay_size);
2193                 if (!deldelay_buf)
2194                         out_of_memory("delete-delay");
2195         }
2196         do_progress = 0;
2197
2198         if (append_mode > 0 || whole_file < 0)
2199                 whole_file = 0;
2200         if (verbose >= 2) {
2201                 rprintf(FINFO, "delta-transmission %s\n",
2202                         whole_file
2203                         ? "disabled for local transfer or --whole-file"
2204                         : "enabled");
2205         }
2206
2207         /* Since we often fill up the outgoing socket and then just sit around
2208          * waiting for the other 2 processes to do their thing, we don't want
2209          * to exit on a timeout.  If the data stops flowing, the receiver will
2210          * notice that and let us know via the redo pipe (or its closing). */
2211         ignore_timeout = 1;
2212
2213         dflt_perms = (ACCESSPERMS & ~orig_umask);
2214
2215         do {
2216 #ifdef SUPPORT_HARD_LINKS
2217                 if (preserve_hard_links && inc_recurse) {
2218                         while (!flist_eof && file_total < FILECNT_LOOKAHEAD/2)
2219                                 wait_for_receiver();
2220                 }
2221 #endif
2222
2223                 if (inc_recurse && cur_flist->parent_ndx >= 0) {
2224                         struct file_struct *fp = dir_flist->files[cur_flist->parent_ndx];
2225                         if (solo_file)
2226                                 strlcpy(fbuf, solo_file, sizeof fbuf);
2227                         else
2228                                 f_name(fp, fbuf);
2229                         ndx = cur_flist->ndx_start - 1;
2230                         recv_generator(fbuf, fp, ndx, itemizing, code, f_out);
2231                         if (delete_during && dry_run < 2 && !list_only
2232                          && !(fp->flags & FLAG_MISSING_DIR)) {
2233                                 if (fp->flags & FLAG_CONTENT_DIR) {
2234                                         dev_t dirdev;
2235                                         if (one_file_system) {
2236                                                 uint32 *devp = F_DIR_DEV_P(fp);
2237                                                 dirdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp));
2238                                         } else
2239                                                 dirdev = MAKEDEV(0, 0);
2240                                         /* We must be sure we've had a chance to receive an I/O
2241                                          * error for this directory before we delete in it. */
2242                                         while (check_for_io_err && !cur_flist->next)
2243                                                 wait_for_receiver();
2244                                         delete_in_dir(fbuf, fp, &dirdev);
2245                                 } else
2246                                         change_local_filter_dir(fbuf, strlen(fbuf), F_DEPTH(fp));
2247                         }
2248                 }
2249                 for (i = cur_flist->low; i <= cur_flist->high; i++) {
2250                         struct file_struct *file = cur_flist->sorted[i];
2251
2252                         if (!F_IS_ACTIVE(file))
2253                                 continue;
2254
2255                         if (unsort_ndx)
2256                                 ndx = F_NDX(file);
2257                         else
2258                                 ndx = i + cur_flist->ndx_start;
2259
2260                         if (solo_file)
2261                                 strlcpy(fbuf, solo_file, sizeof fbuf);
2262                         else
2263                                 f_name(file, fbuf);
2264                         recv_generator(fbuf, file, ndx, itemizing, code, f_out);
2265
2266                         check_for_finished_files(itemizing, code, 0);
2267
2268                         if (i + cur_flist->ndx_start >= next_loopchk) {
2269                                 if (allowed_lull)
2270                                         maybe_send_keepalive();
2271                                 else
2272                                         maybe_flush_socket(0);
2273                                 next_loopchk += loopchk_limit;
2274                         }
2275                 }
2276
2277                 if (!inc_recurse) {
2278                         write_ndx(f_out, NDX_DONE);
2279                         break;
2280                 }
2281
2282                 while (1) {
2283                         check_for_finished_files(itemizing, code, 1);
2284                         if (cur_flist->next || flist_eof)
2285                                 break;
2286                         wait_for_receiver();
2287                 }
2288         } while ((cur_flist = cur_flist->next) != NULL);
2289
2290         if (delete_during)
2291                 delete_in_dir(NULL, NULL, &dev_zero);
2292         phase++;
2293         if (verbose > 2)
2294                 rprintf(FINFO, "generate_files phase=%d\n", phase);
2295
2296         while (1) {
2297                 check_for_finished_files(itemizing, code, 1);
2298                 if (msgdone_cnt)
2299                         break;
2300                 wait_for_receiver();
2301         }
2302
2303         phase++;
2304         if (verbose > 2)
2305                 rprintf(FINFO, "generate_files phase=%d\n", phase);
2306
2307         write_ndx(f_out, NDX_DONE);
2308         /* Reduce round-trip lag-time for a useless delay-updates phase. */
2309         if (protocol_version >= 29 && !delay_updates)
2310                 write_ndx(f_out, NDX_DONE);
2311
2312         /* Read MSG_DONE for the redo phase (and any prior messages). */
2313         while (1) {
2314                 check_for_finished_files(itemizing, code, 0);
2315                 if (msgdone_cnt > 1)
2316                         break;
2317                 wait_for_receiver();
2318         }
2319
2320         if (protocol_version >= 29) {
2321                 phase++;
2322                 if (verbose > 2)
2323                         rprintf(FINFO, "generate_files phase=%d\n", phase);
2324                 if (delay_updates)
2325                         write_ndx(f_out, NDX_DONE);
2326                 /* Read MSG_DONE for delay-updates phase & prior messages. */
2327                 while (msgdone_cnt == 2)
2328                         wait_for_receiver();
2329         }
2330
2331         do_progress = save_do_progress;
2332         if (delete_during == 2)
2333                 do_delayed_deletions(fbuf);
2334         if (delete_after && !solo_file && file_total > 0)
2335                 do_delete_pass();
2336
2337         if ((need_retouch_dir_perms || need_retouch_dir_times)
2338          && dir_tweaking && (!inc_recurse || delete_during == 2))
2339                 touch_up_dirs(dir_flist, -1);
2340
2341         if (max_delete >= 0 && deletion_count > max_delete) {
2342                 rprintf(FWARNING,
2343                         "Deletions stopped due to --max-delete limit (%d skipped)\n",
2344                         deletion_count - max_delete);
2345                 io_error |= IOERR_DEL_LIMIT;
2346         }
2347
2348         if (verbose > 2)
2349                 rprintf(FINFO, "generate_files finished\n");
2350 }