receiver.c

   1 /* -*- c-file-style: "linux" -*-
   2
   3    Copyright (C) 1996-2000 by Andrew Tridgell
   4    Copyright (C) Paul Mackerras 1996
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 #include "rsync.h"
  22
  23 extern int verbose;
  24 extern int recurse;
  25 extern int delete_mode;
  26 extern int delete_after;
  27 extern int max_delete;
  28 extern int csum_length;
  29 extern struct stats stats;
  30 extern int dry_run;
  31 extern int read_batch;
  32 extern int batch_gen_fd;
  33 extern int am_server;
  34 extern int relative_paths;
  35 extern int keep_dirlinks;
  36 extern int preserve_hard_links;
  37 extern int preserve_perms;
  38 extern int cvs_exclude;
  39 extern int io_error;
  40 extern char *tmpdir;
  41 extern char *partial_dir;
  42 extern char *compare_dest;
  43 extern int make_backups;
  44 extern int do_progress;
  45 extern char *backup_dir;
  46 extern char *backup_suffix;
  47 extern int backup_suffix_len;
  48 extern int cleanup_got_literal;
  49 extern int module_id;
  50 extern int ignore_errors;
  51 extern int orig_umask;
  52 extern int keep_partial;
  53 extern int checksum_seed;
  54 extern int inplace;
  55
  56 extern struct exclude_list_struct server_exclude_list;
  57
  58
  59 static void delete_one(char *fn, int is_dir)
  60 {
  61         if (!is_dir) {
  62                 if (robust_unlink(fn) != 0) {
  63                         rsyserr(FERROR, errno, "delete_one: unlink %s failed",
  64                                 full_fname(fn));
  65                 } else if (verbose)
  66                         rprintf(FINFO, "deleting %s\n", safe_fname(fn));
  67         } else {
  68                 if (do_rmdir(fn) != 0) {
  69                         if (errno == ENOTDIR && keep_dirlinks) {
  70                                 delete_one(fn, 0);
  71                                 return;
  72                         }
  73                         if (errno != ENOTEMPTY && errno != EEXIST) {
  74                                 rsyserr(FERROR, errno,
  75                                         "delete_one: rmdir %s failed",
  76                                         full_fname(fn));
  77                         }
  78                 } else if (verbose) {
  79                         rprintf(FINFO, "deleting directory %s\n",
  80                                 safe_fname(fn));
  81                 }
  82         }
  83 }
  84
  85
  86 static int is_backup_file(char *fn)
  87 {
  88         int k = strlen(fn) - backup_suffix_len;
  89         return k > 0 && strcmp(fn+k, backup_suffix) == 0;
  90 }
  91
  92
  93 /* This deletes any files on the receiving side that are not present
  94  * on the sending side. */
  95 void delete_files(struct file_list *flist)
  96 {
  97         struct file_list *local_file_list;
  98         int i, j;
  99         char *argv[1], fbuf[MAXPATHLEN];
 100         static int deletion_count;
 101
 102         if (cvs_exclude)
 103                 add_cvs_excludes();
 104
 105         if (io_error && !(lp_ignore_errors(module_id) || ignore_errors)) {
 106                 rprintf(FINFO,"IO error encountered - skipping file deletion\n");
 107                 return;
 108         }
 109
 110         for (j = 0; j < flist->count; j++) {
 111                 if (!(flist->files[j]->flags & FLAG_TOP_DIR)
 112                     || !S_ISDIR(flist->files[j]->mode))
 113                         continue;
 114
 115                 argv[0] = f_name_to(flist->files[j], fbuf);
 116
 117                 if (!(local_file_list = send_file_list(-1, 1, argv)))
 118                         continue;
 119
 120                 if (verbose > 1)
 121                         rprintf(FINFO, "deleting in %s\n", safe_fname(fbuf));
 122
 123                 for (i = local_file_list->count-1; i >= 0; i--) {
 124                         if (max_delete && deletion_count > max_delete)
 125                                 break;
 126                         if (!local_file_list->files[i]->basename)
 127                                 continue;
 128                         if (flist_find(flist,local_file_list->files[i]) < 0) {
 129                                 char *f = f_name(local_file_list->files[i]);
 130                                 if (make_backups && (backup_dir || !is_backup_file(f))) {
 131                                         make_backup(f);
 132                                         if (verbose) {
 133                                                 rprintf(FINFO, "deleting %s\n",
 134                                                         safe_fname(f));
 135                                         }
 136                                 } else {
 137                                         int mode = local_file_list->files[i]->mode;
 138                                         delete_one(f, S_ISDIR(mode) != 0);
 139                                 }
 140                                 deletion_count++;
 141                         }
 142                 }
 143                 flist_free(local_file_list);
 144         }
 145 }
 146
 147
 148 /*
 149  * get_tmpname() - create a tmp filename for a given filename
 150  *
 151  *   If a tmpdir is defined, use that as the directory to
 152  *   put it in.  Otherwise, the tmp filename is in the same
 153  *   directory as the given name.  Note that there may be no
 154  *   directory at all in the given name!
 155  *
 156  *   The tmp filename is basically the given filename with a
 157  *   dot prepended, and .XXXXXX appended (for mkstemp() to
 158  *   put its unique gunk in).  Take care to not exceed
 159  *   either the MAXPATHLEN or NAME_MAX, esp. the last, as
 160  *   the basename basically becomes 8 chars longer. In that
 161  *   case, the original name is shortened sufficiently to
 162  *   make it all fit.
 163  *
 164  *   Of course, there's no real reason for the tmp name to
 165  *   look like the original, except to satisfy us humans.
 166  *   As long as it's unique, rsync will work.
 167  */
 168
 169 static int get_tmpname(char *fnametmp, char *fname)
 170 {
 171         char *f;
 172         int     length = 0;
 173         int     maxname;
 174
 175         if (tmpdir) {
 176                 /* Note: this can't overflow, so the return value is safe */
 177                 length = strlcpy(fnametmp, tmpdir, MAXPATHLEN - 2);
 178                 fnametmp[length++] = '/';
 179                 fnametmp[length] = '\0';        /* always NULL terminated */
 180         }
 181
 182         if ((f = strrchr(fname, '/')) != NULL) {
 183                 ++f;
 184                 if (!tmpdir) {
 185                         length = f - fname;
 186                         /* copy up to and including the slash */
 187                         strlcpy(fnametmp, fname, length + 1);
 188                 }
 189         } else
 190                 f = fname;
 191         fnametmp[length++] = '.';
 192         fnametmp[length] = '\0';                /* always NULL terminated */
 193
 194         maxname = MIN(MAXPATHLEN - 7 - length, NAME_MAX - 8);
 195
 196         if (maxname < 1) {
 197                 rprintf(FERROR, "temporary filename too long: %s\n", fname);
 198                 fnametmp[0] = '\0';
 199                 return 0;
 200         }
 201
 202         strlcpy(fnametmp + length, f, maxname);
 203         strcat(fnametmp + length, ".XXXXXX");
 204
 205         return 1;
 206 }
 207
 208
 209 static int receive_data(int f_in, char *fname_r, int fd_r, OFF_T size_r,
 210                         char *fname, int fd, OFF_T total_size)
 211 {
 212         static char file_sum1[MD4_SUM_LENGTH];
 213         static char file_sum2[MD4_SUM_LENGTH];
 214         struct map_struct *mapbuf;
 215         struct sum_struct sum;
 216         unsigned int len;
 217         OFF_T offset = 0;
 218         OFF_T offset2;
 219         char *data;
 220         int i;
 221         char *map = NULL;
 222
 223         read_sum_head(f_in, &sum);
 224
 225         if (fd_r >= 0 && size_r > 0) {
 226                 mapbuf = map_file(fd_r, size_r, sum.blength);
 227                 if (verbose > 2) {
 228                         rprintf(FINFO, "recv mapped %s of size %.0f\n",
 229                                 safe_fname(fname_r), (double)size_r);
 230                 }
 231         } else
 232                 mapbuf = NULL;
 233
 234         sum_init(checksum_seed);
 235
 236         while ((i = recv_token(f_in, &data)) != 0) {
 237                 if (do_progress)
 238                         show_progress(offset, total_size);
 239
 240                 if (i > 0) {
 241                         if (verbose > 3) {
 242                                 rprintf(FINFO,"data recv %d at %.0f\n",
 243                                         i,(double)offset);
 244                         }
 245
 246                         stats.literal_data += i;
 247                         cleanup_got_literal = 1;
 248
 249                         sum_update(data,i);
 250
 251                         if (fd != -1 && write_file(fd,data,i) != i)
 252                                 goto report_write_error;
 253                         offset += i;
 254                         continue;
 255                 }
 256
 257                 i = -(i+1);
 258                 offset2 = i*(OFF_T)sum.blength;
 259                 len = sum.blength;
 260                 if (i == (int)sum.count-1 && sum.remainder != 0)
 261                         len = sum.remainder;
 262
 263                 stats.matched_data += len;
 264
 265                 if (verbose > 3)
 266                         rprintf(FINFO,"chunk[%d] of size %d at %.0f offset=%.0f\n",
 267                                 i,len,(double)offset2,(double)offset);
 268
 269                 if (mapbuf) {
 270                         map = map_ptr(mapbuf,offset2,len);
 271
 272                         see_token(map, len);
 273                         sum_update(map,len);
 274                 }
 275
 276                 if (inplace) {
 277                         if (offset == offset2 && fd != -1) {
 278                                 if (flush_write_file(fd) < 0)
 279                                         goto report_write_error;
 280                                 offset += len;
 281                                 if (do_lseek(fd, len, SEEK_CUR) != offset) {
 282                                         rsyserr(FERROR, errno,
 283                                                 "lseek failed on %s",
 284                                                 full_fname(fname));
 285                                         exit_cleanup(RERR_FILEIO);
 286                                 }
 287                                 continue;
 288                         }
 289                 }
 290                 if (fd != -1 && write_file(fd, map, len) != (int)len)
 291                         goto report_write_error;
 292                 offset += len;
 293         }
 294
 295         flush_write_file(fd);
 296
 297 #ifdef HAVE_FTRUNCATE
 298         if (inplace && fd != -1)
 299                 ftruncate(fd, offset);
 300 #endif
 301
 302         if (do_progress)
 303                 end_progress(total_size);
 304
 305         if (fd != -1 && offset > 0 && sparse_end(fd) != 0) {
 306             report_write_error:
 307                 rsyserr(FERROR, errno, "write failed on %s",
 308                         full_fname(fname));
 309                 exit_cleanup(RERR_FILEIO);
 310         }
 311
 312         sum_end(file_sum1);
 313
 314         if (mapbuf)
 315                 unmap_file(mapbuf);
 316
 317         read_buf(f_in,file_sum2,MD4_SUM_LENGTH);
 318         if (verbose > 2)
 319                 rprintf(FINFO,"got file_sum\n");
 320         if (fd != -1 && memcmp(file_sum1, file_sum2, MD4_SUM_LENGTH) != 0)
 321                 return 0;
 322         return 1;
 323 }
 324
 325
 326 static void discard_receive_data(int f_in, OFF_T length)
 327 {
 328         receive_data(f_in, NULL, -1, 0, NULL, -1, length);
 329 }
 330
 331
 332 /**
 333  * main routine for receiver process.
 334  *
 335  * Receiver process runs on the same host as the generator process. */
 336 int recv_files(int f_in, struct file_list *flist, char *local_name)
 337 {
 338         int next_gen_i = -1;
 339         int fd1,fd2;
 340         STRUCT_STAT st;
 341         char *fname, fbuf[MAXPATHLEN];
 342         char template[MAXPATHLEN];
 343         char fnametmp[MAXPATHLEN];
 344         char *fnamecmp, *partialptr;
 345         char fnamecmpbuf[MAXPATHLEN];
 346         struct file_struct *file;
 347         struct stats initial_stats;
 348         int save_make_backups = make_backups;
 349         int i, recv_ok, phase = 0;
 350
 351         if (verbose > 2)
 352                 rprintf(FINFO,"recv_files(%d) starting\n",flist->count);
 353
 354         if (flist->hlink_pool) {
 355                 pool_destroy(flist->hlink_pool);
 356                 flist->hlink_pool = NULL;
 357         }
 358
 359         while (1) {
 360                 cleanup_disable();
 361
 362                 i = read_int(f_in);
 363                 if (i == -1) {
 364                         if (read_batch) {
 365                                 if (next_gen_i != flist->count)
 366                                         while (read_int(batch_gen_fd) != -1) {}
 367                                 next_gen_i = -1;
 368                         }
 369
 370                         if (phase)
 371                                 break;
 372
 373                         phase = 1;
 374                         csum_length = SUM_LENGTH;
 375                         if (verbose > 2)
 376                                 rprintf(FINFO, "recv_files phase=%d\n", phase);
 377                         send_msg(MSG_DONE, "", 0);
 378                         if (keep_partial)
 379                                 make_backups = 0; /* prevents double backup */
 380                         continue;
 381                 }
 382
 383                 if (i < 0 || i >= flist->count) {
 384                         rprintf(FERROR,"Invalid file index %d in recv_files (count=%d)\n",
 385                                 i, flist->count);
 386                         exit_cleanup(RERR_PROTOCOL);
 387                 }
 388
 389                 file = flist->files[i];
 390
 391                 stats.current_file_index = i;
 392                 stats.num_transferred_files++;
 393                 stats.total_transferred_size += file->length;
 394                 cleanup_got_literal = 0;
 395
 396                 if (local_name)
 397                         fname = local_name;
 398                 else
 399                         fname = f_name_to(file, fbuf);
 400
 401                 if (dry_run) {
 402                         if (!am_server && verbose) /* log the transfer */
 403                                 rprintf(FINFO, "%s\n", safe_fname(fname));
 404                         continue;
 405                 }
 406
 407                 initial_stats = stats;
 408
 409                 if (verbose > 2)
 410                         rprintf(FINFO, "recv_files(%s)\n", safe_fname(fname));
 411
 412                 if (read_batch) {
 413                         while (i > next_gen_i) {
 414                                 next_gen_i = read_int(batch_gen_fd);
 415                                 if (next_gen_i == -1)
 416                                         next_gen_i = flist->count;
 417                         }
 418                         if (i < next_gen_i) {
 419                                 rprintf(FINFO, "skipping update for \"%s\"\n",
 420                                         safe_fname(fname));
 421                                 discard_receive_data(f_in, file->length);
 422                                 continue;
 423                         }
 424                 }
 425
 426                 if (server_exclude_list.head
 427                     && check_exclude(&server_exclude_list, fname,
 428                                      S_ISDIR(file->mode)) < 0) {
 429                         if (verbose) {
 430                                 rprintf(FINFO,
 431                                         "skipping server-excluded update for \"%s\"\n",
 432                                         safe_fname(fname));
 433                         }
 434                         discard_receive_data(f_in, file->length);
 435                         continue;
 436                 }
 437
 438                 if (partial_dir) {
 439                         if ((partialptr = partial_dir_fname(fname)) != NULL)
 440                                 fnamecmp = partialptr;
 441                         else
 442                                 fnamecmp = fname;
 443                 } else
 444                         fnamecmp = partialptr = fname;
 445
 446                 /* open the file */
 447                 fd1 = do_open(fnamecmp, O_RDONLY, 0);
 448
 449                 if (fd1 == -1 && fnamecmp != fname) {
 450                         fnamecmp = fname;
 451                         fd1 = do_open(fnamecmp, O_RDONLY, 0);
 452                 }
 453
 454                 if (fd1 == -1 && compare_dest != NULL) {
 455                         /* try the file at compare_dest instead */
 456                         pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 457                                  compare_dest, fname);
 458                         fnamecmp = fnamecmpbuf;
 459                         fd1 = do_open(fnamecmp, O_RDONLY, 0);
 460                 }
 461
 462                 if (fd1 != -1 && do_fstat(fd1,&st) != 0) {
 463                         rsyserr(FERROR, errno, "fstat %s failed",
 464                                 full_fname(fnamecmp));
 465                         discard_receive_data(f_in, file->length);
 466                         close(fd1);
 467                         continue;
 468                 }
 469
 470                 if (fd1 != -1 && S_ISDIR(st.st_mode) && fnamecmp == fname) {
 471                         /* this special handling for directories
 472                          * wouldn't be necessary if robust_rename()
 473                          * and the underlying robust_unlink could cope
 474                          * with directories
 475                          */
 476                         rprintf(FERROR,"recv_files: %s is a directory\n",
 477                                 full_fname(fnamecmp));
 478                         discard_receive_data(f_in, file->length);
 479                         close(fd1);
 480                         continue;
 481                 }
 482
 483                 if (fd1 != -1 && !S_ISREG(st.st_mode)) {
 484                         close(fd1);
 485                         fd1 = -1;
 486                 }
 487
 488                 if (fd1 != -1 && !preserve_perms) {
 489                         /* if the file exists already and we aren't preserving
 490                          * permissions then act as though the remote end sent
 491                          * us the file permissions we already have */
 492                         file->mode = st.st_mode;
 493                 }
 494
 495                 /* We now check to see if we are writing file "inplace" */
 496                 if (inplace)  {
 497                         fd2 = do_open(fnamecmp, O_WRONLY|O_CREAT, 0);
 498                         if (fd2 == -1) {
 499                                 rsyserr(FERROR, errno, "open %s failed",
 500                                         full_fname(fnamecmp));
 501                                 discard_receive_data(f_in, file->length);
 502                                 if (fd1 != -1)
 503                                         close(fd1);
 504                                 continue;
 505                         }
 506                 } else {
 507                         if (!get_tmpname(fnametmp,fname)) {
 508                                 discard_receive_data(f_in, file->length);
 509                                 if (fd1 != -1)
 510                                         close(fd1);
 511                                 continue;
 512                         }
 513
 514                         strlcpy(template, fnametmp, sizeof template);
 515
 516                         /* we initially set the perms without the
 517                          * setuid/setgid bits to ensure that there is no race
 518                          * condition. They are then correctly updated after
 519                          * the lchown. Thanks to snabb@epipe.fi for pointing
 520                          * this out.  We also set it initially without group
 521                          * access because of a similar race condition. */
 522                         fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 523
 524                         /* in most cases parent directories will already exist
 525                          * because their information should have been previously
 526                          * transferred, but that may not be the case with -R */
 527                         if (fd2 == -1 && relative_paths && errno == ENOENT
 528                             && create_directory_path(fnametmp, orig_umask) == 0) {
 529                                 strlcpy(fnametmp, template, sizeof fnametmp);
 530                                 fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 531                         }
 532                         if (fd2 == -1) {
 533                                 rsyserr(FERROR, errno, "mkstemp %s failed",
 534                                         full_fname(fnametmp));
 535                                 discard_receive_data(f_in, file->length);
 536                                 if (fd1 != -1)
 537                                         close(fd1);
 538                                 continue;
 539                         }
 540
 541                         if (partialptr)
 542                                 cleanup_set(fnametmp, partialptr, file, fd1, fd2);
 543                 }
 544
 545                 if (!am_server && verbose) /* log the transfer */
 546                         rprintf(FINFO, "%s\n", safe_fname(fname));
 547
 548                 /* recv file data */
 549                 recv_ok = receive_data(f_in, fnamecmp, fd1, st.st_size,
 550                                        fname, fd2, file->length);
 551
 552                 log_recv(file, &initial_stats);
 553
 554                 if (fd1 != -1)
 555                         close(fd1);
 556                 if (close(fd2) < 0) {
 557                         rsyserr(FERROR, errno, "close failed on %s",
 558                                 full_fname(fnametmp));
 559                         exit_cleanup(RERR_FILEIO);
 560                 }
 561
 562                 if (recv_ok || inplace)
 563                         finish_transfer(fname, fnametmp, file, recv_ok);
 564                 else if (keep_partial && partialptr
 565                     && handle_partial_dir(partialptr, PDIR_CREATE))
 566                         finish_transfer(partialptr, fnametmp, file, 0);
 567                 else {
 568                         partialptr = NULL;
 569                         do_unlink(fnametmp);
 570                 }
 571
 572                 if (partialptr != fname && fnamecmp == partialptr && recv_ok) {
 573                         do_unlink(partialptr);
 574                         handle_partial_dir(partialptr, PDIR_DELETE);
 575                 }
 576
 577                 cleanup_disable();
 578
 579                 if (!recv_ok) {
 580                         int msgtype = csum_length == SUM_LENGTH || read_batch ?
 581                                 FERROR : FINFO;
 582                         if (msgtype == FERROR || verbose) {
 583                                 char *errstr, *redostr, *keptstr;
 584                                 if (!(keep_partial && partialptr) && !inplace)
 585                                         keptstr = "discarded";
 586                                 else if (partial_dir)
 587                                         keptstr = "put into partial-dir";
 588                                 else
 589                                         keptstr = "retained";
 590                                 if (msgtype == FERROR) {
 591                                         errstr = "ERROR";
 592                                         redostr = "";
 593                                 } else {
 594                                         errstr = "WARNING";
 595                                         redostr = " (will try again)";
 596                                 }
 597                                 rprintf(msgtype,
 598                                         "%s: %s failed verification -- update %s%s.\n",
 599                                         errstr, safe_fname(fname),
 600                                         keptstr, redostr);
 601                         }
 602                         if (csum_length != SUM_LENGTH) {
 603                                 char buf[4];
 604                                 SIVAL(buf, 0, i);
 605                                 send_msg(MSG_REDO, buf, 4);
 606                         }
 607                 }
 608         }
 609         make_backups = save_make_backups;
 610
 611         if (delete_after && recurse && !local_name && flist->count > 0)
 612                 delete_files(flist);
 613
 614         if (verbose > 2)
 615                 rprintf(FINFO,"recv_files finished\n");
 616
 617         return 0;
 618 }