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_after;
  26 extern int max_delete;
  27 extern int csum_length;
  28 extern struct stats stats;
  29 extern int dry_run;
  30 extern int read_batch;
  31 extern int batch_gen_fd;
  32 extern int am_server;
  33 extern int protocol_version;
  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 != ENOTEMPTY && errno != EEXIST) {
  70                                 rsyserr(FERROR, errno,
  71                                         "delete_one: rmdir %s failed",
  72                                         full_fname(fn));
  73                         }
  74                 } else if (verbose) {
  75                         rprintf(FINFO, "deleting directory %s\n",
  76                                 safe_fname(fn));
  77                 }
  78         }
  79 }
  80
  81
  82 static int is_backup_file(char *fn)
  83 {
  84         int k = strlen(fn) - backup_suffix_len;
  85         return k > 0 && strcmp(fn+k, backup_suffix) == 0;
  86 }
  87
  88
  89 /* This deletes any files on the receiving side that are not present
  90  * on the sending side. */
  91 void delete_files(struct file_list *flist)
  92 {
  93         struct file_list *local_file_list;
  94         int i, j;
  95         char *argv[1], fbuf[MAXPATHLEN];
  96         static int deletion_count;
  97
  98         if (cvs_exclude)
  99                 add_cvs_excludes();
 100
 101         if (io_error && !(lp_ignore_errors(module_id) || ignore_errors)) {
 102                 rprintf(FINFO,"IO error encountered - skipping file deletion\n");
 103                 return;
 104         }
 105
 106         for (j = 0; j < flist->count; j++) {
 107                 if (!(flist->files[j]->flags & FLAG_TOP_DIR)
 108                     || !S_ISDIR(flist->files[j]->mode))
 109                         continue;
 110
 111                 argv[0] = f_name_to(flist->files[j], fbuf);
 112
 113                 if (!(local_file_list = send_file_list(-1, 1, argv)))
 114                         continue;
 115
 116                 if (verbose > 1)
 117                         rprintf(FINFO, "deleting in %s\n", safe_fname(fbuf));
 118
 119                 for (i = local_file_list->count-1; i >= 0; i--) {
 120                         if (max_delete && deletion_count >= max_delete)
 121                                 break;
 122                         if (!local_file_list->files[i]->basename)
 123                                 continue;
 124                         if (flist_find(flist,local_file_list->files[i]) < 0) {
 125                                 char *f = f_name(local_file_list->files[i]);
 126                                 int mode = local_file_list->files[i]->mode;
 127                                 if (make_backups && (backup_dir || !is_backup_file(f))
 128                                   && !S_ISDIR(mode)) {
 129                                         make_backup(f);
 130                                         if (verbose) {
 131                                                 rprintf(FINFO, "deleting %s\n",
 132                                                         safe_fname(f));
 133                                         }
 134                                 } else
 135                                         delete_one(f, S_ISDIR(mode) != 0);
 136                                 deletion_count++;
 137                         }
 138                 }
 139                 flist_free(local_file_list);
 140         }
 141 }
 142
 143
 144 /*
 145  * get_tmpname() - create a tmp filename for a given filename
 146  *
 147  *   If a tmpdir is defined, use that as the directory to
 148  *   put it in.  Otherwise, the tmp filename is in the same
 149  *   directory as the given name.  Note that there may be no
 150  *   directory at all in the given name!
 151  *
 152  *   The tmp filename is basically the given filename with a
 153  *   dot prepended, and .XXXXXX appended (for mkstemp() to
 154  *   put its unique gunk in).  Take care to not exceed
 155  *   either the MAXPATHLEN or NAME_MAX, esp. the last, as
 156  *   the basename basically becomes 8 chars longer. In that
 157  *   case, the original name is shortened sufficiently to
 158  *   make it all fit.
 159  *
 160  *   Of course, there's no real reason for the tmp name to
 161  *   look like the original, except to satisfy us humans.
 162  *   As long as it's unique, rsync will work.
 163  */
 164
 165 static int get_tmpname(char *fnametmp, char *fname)
 166 {
 167         char *f;
 168         int     length = 0;
 169         int     maxname;
 170
 171         if (tmpdir) {
 172                 /* Note: this can't overflow, so the return value is safe */
 173                 length = strlcpy(fnametmp, tmpdir, MAXPATHLEN - 2);
 174                 fnametmp[length++] = '/';
 175                 fnametmp[length] = '\0';        /* always NULL terminated */
 176         }
 177
 178         if ((f = strrchr(fname, '/')) != NULL) {
 179                 ++f;
 180                 if (!tmpdir) {
 181                         length = f - fname;
 182                         /* copy up to and including the slash */
 183                         strlcpy(fnametmp, fname, length + 1);
 184                 }
 185         } else
 186                 f = fname;
 187         fnametmp[length++] = '.';
 188         fnametmp[length] = '\0';                /* always NULL terminated */
 189
 190         maxname = MIN(MAXPATHLEN - 7 - length, NAME_MAX - 8);
 191
 192         if (maxname < 1) {
 193                 rprintf(FERROR, "temporary filename too long: %s\n", fname);
 194                 fnametmp[0] = '\0';
 195                 return 0;
 196         }
 197
 198         strlcpy(fnametmp + length, f, maxname);
 199         strcat(fnametmp + length, ".XXXXXX");
 200
 201         return 1;
 202 }
 203
 204
 205 static int receive_data(int f_in, char *fname_r, int fd_r, OFF_T size_r,
 206                         char *fname, int fd, OFF_T total_size)
 207 {
 208         static char file_sum1[MD4_SUM_LENGTH];
 209         static char file_sum2[MD4_SUM_LENGTH];
 210         struct map_struct *mapbuf;
 211         struct sum_struct sum;
 212         unsigned int len;
 213         OFF_T offset = 0;
 214         OFF_T offset2;
 215         char *data;
 216         int i;
 217         char *map = NULL;
 218
 219         read_sum_head(f_in, &sum);
 220
 221         if (fd_r >= 0 && size_r > 0) {
 222                 OFF_T map_size = MAX(sum.blength * 2, 16*1024);
 223                 mapbuf = map_file(fd_r, size_r, map_size, sum.blength);
 224                 if (verbose > 2) {
 225                         rprintf(FINFO, "recv mapped %s of size %.0f\n",
 226                                 safe_fname(fname_r), (double)size_r);
 227                 }
 228         } else
 229                 mapbuf = NULL;
 230
 231         sum_init(checksum_seed);
 232
 233         while ((i = recv_token(f_in, &data)) != 0) {
 234                 if (do_progress)
 235                         show_progress(offset, total_size);
 236
 237                 if (i > 0) {
 238                         if (verbose > 3) {
 239                                 rprintf(FINFO,"data recv %d at %.0f\n",
 240                                         i,(double)offset);
 241                         }
 242
 243                         stats.literal_data += i;
 244                         cleanup_got_literal = 1;
 245
 246                         sum_update(data,i);
 247
 248                         if (fd != -1 && write_file(fd,data,i) != i)
 249                                 goto report_write_error;
 250                         offset += i;
 251                         continue;
 252                 }
 253
 254                 i = -(i+1);
 255                 offset2 = i*(OFF_T)sum.blength;
 256                 len = sum.blength;
 257                 if (i == (int)sum.count-1 && sum.remainder != 0)
 258                         len = sum.remainder;
 259
 260                 stats.matched_data += len;
 261
 262                 if (verbose > 3)
 263                         rprintf(FINFO,"chunk[%d] of size %d at %.0f offset=%.0f\n",
 264                                 i,len,(double)offset2,(double)offset);
 265
 266                 if (mapbuf) {
 267                         map = map_ptr(mapbuf,offset2,len);
 268
 269                         see_token(map, len);
 270                         sum_update(map,len);
 271                 }
 272
 273                 if (inplace) {
 274                         if (offset == offset2 && fd != -1) {
 275                                 if (flush_write_file(fd) < 0)
 276                                         goto report_write_error;
 277                                 offset += len;
 278                                 if (do_lseek(fd, len, SEEK_CUR) != offset) {
 279                                         rsyserr(FERROR, errno,
 280                                                 "lseek failed on %s",
 281                                                 full_fname(fname));
 282                                         exit_cleanup(RERR_FILEIO);
 283                                 }
 284                                 continue;
 285                         }
 286                 }
 287                 if (fd != -1 && write_file(fd, map, len) != (int)len)
 288                         goto report_write_error;
 289                 offset += len;
 290         }
 291
 292         flush_write_file(fd);
 293
 294 #ifdef HAVE_FTRUNCATE
 295         if (inplace && fd != -1)
 296                 ftruncate(fd, offset);
 297 #endif
 298
 299         if (do_progress)
 300                 end_progress(total_size);
 301
 302         if (fd != -1 && offset > 0 && sparse_end(fd) != 0) {
 303             report_write_error:
 304                 rsyserr(FERROR, errno, "write failed on %s",
 305                         full_fname(fname));
 306                 exit_cleanup(RERR_FILEIO);
 307         }
 308
 309         sum_end(file_sum1);
 310
 311         if (mapbuf)
 312                 unmap_file(mapbuf);
 313
 314         read_buf(f_in,file_sum2,MD4_SUM_LENGTH);
 315         if (verbose > 2)
 316                 rprintf(FINFO,"got file_sum\n");
 317         if (fd != -1 && memcmp(file_sum1, file_sum2, MD4_SUM_LENGTH) != 0)
 318                 return 0;
 319         return 1;
 320 }
 321
 322
 323 static void discard_receive_data(int f_in, OFF_T length)
 324 {
 325         receive_data(f_in, NULL, -1, 0, NULL, -1, length);
 326 }
 327
 328
 329 /**
 330  * main routine for receiver process.
 331  *
 332  * Receiver process runs on the same host as the generator process. */
 333 int recv_files(int f_in, struct file_list *flist, char *local_name,
 334                int f_in_name)
 335 {
 336         int next_gen_i = -1;
 337         int fd1,fd2;
 338         STRUCT_STAT st;
 339         char *fname, fbuf[MAXPATHLEN];
 340         char template[MAXPATHLEN];
 341         char fnametmp[MAXPATHLEN];
 342         char *fnamecmp, *partialptr;
 343         char fnamecmpbuf[MAXPATHLEN];
 344         struct file_struct *file;
 345         struct stats initial_stats;
 346         int save_make_backups = make_backups;
 347         int i, recv_ok, phase = 0;
 348
 349         if (verbose > 2)
 350                 rprintf(FINFO,"recv_files(%d) starting\n",flist->count);
 351
 352         if (flist->hlink_pool) {
 353                 pool_destroy(flist->hlink_pool);
 354                 flist->hlink_pool = NULL;
 355         }
 356
 357         while (1) {
 358                 cleanup_disable();
 359
 360                 i = read_int(f_in);
 361                 if (i == -1) {
 362                         if (read_batch) {
 363                                 if (next_gen_i != flist->count) {
 364                                         do {
 365                                                 if (f_in_name >= 0
 366                                                     && next_gen_i >= 0)
 367                                                         read_byte(f_in_name);
 368                                         } while (read_int(batch_gen_fd) != -1);
 369                                 }
 370                                 next_gen_i = -1;
 371                         }
 372
 373                         if (phase)
 374                                 break;
 375
 376                         phase = 1;
 377                         csum_length = SUM_LENGTH;
 378                         if (verbose > 2)
 379                                 rprintf(FINFO, "recv_files phase=%d\n", phase);
 380                         send_msg(MSG_DONE, "", 0);
 381                         if (keep_partial)
 382                                 make_backups = 0; /* prevents double backup */
 383                         continue;
 384                 }
 385
 386                 if (i < 0 || i >= flist->count) {
 387                         rprintf(FERROR,"Invalid file index %d in recv_files (count=%d)\n",
 388                                 i, flist->count);
 389                         exit_cleanup(RERR_PROTOCOL);
 390                 }
 391
 392                 file = flist->files[i];
 393
 394                 stats.current_file_index = i;
 395                 stats.num_transferred_files++;
 396                 stats.total_transferred_size += file->length;
 397                 cleanup_got_literal = 0;
 398
 399                 if (local_name)
 400                         fname = local_name;
 401                 else
 402                         fname = f_name_to(file, fbuf);
 403
 404                 if (dry_run) {
 405                         if (!am_server && verbose) /* log the transfer */
 406                                 rprintf(FINFO, "%s\n", safe_fname(fname));
 407                         continue;
 408                 }
 409
 410                 initial_stats = stats;
 411
 412                 if (verbose > 2)
 413                         rprintf(FINFO, "recv_files(%s)\n", safe_fname(fname));
 414
 415                 if (read_batch) {
 416                         while (i > next_gen_i) {
 417                                 if (f_in_name >= 0 && next_gen_i >= 0)
 418                                         read_byte(f_in_name);
 419                                 next_gen_i = read_int(batch_gen_fd);
 420                                 if (next_gen_i == -1)
 421                                         next_gen_i = flist->count;
 422                         }
 423                         if (i < next_gen_i) {
 424                                 rprintf(FINFO, "skipping update for \"%s\"\n",
 425                                         safe_fname(fname));
 426                                 discard_receive_data(f_in, file->length);
 427                                 continue;
 428                         }
 429                         next_gen_i = -1;
 430                 }
 431
 432                 if (server_exclude_list.head
 433                     && check_exclude(&server_exclude_list, fname,
 434                                      S_ISDIR(file->mode)) < 0) {
 435                         rprintf(FERROR, "attempt to hack rsync failed.\n");
 436                         exit_cleanup(RERR_PROTOCOL);
 437                 }
 438
 439                 partialptr = partial_dir ? partial_dir_fname(fname) : fname;
 440
 441                 if (f_in_name >= 0) {
 442                         switch (read_byte(f_in_name)) {
 443                         case FNAMECMP_FNAME:
 444                                 fnamecmp = fname;
 445                                 break;
 446                         case FNAMECMP_PARTIAL_DIR:
 447                                 fnamecmp = partialptr ? partialptr : fname;
 448                                 break;
 449                         case FNAMECMP_BACKUP:
 450                                 fnamecmp = get_backup_name(fname);
 451                                 break;
 452                         case FNAMECMP_CMPDEST:
 453                         default:
 454                                 pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 455                                          compare_dest, fname);
 456                                 fnamecmp = fnamecmpbuf;
 457                                 break;
 458                         }
 459                 } else
 460                         fnamecmp = fname;
 461
 462                 /* open the file */
 463                 fd1 = do_open(fnamecmp, O_RDONLY, 0);
 464
 465                 if (fd1 != -1 && do_fstat(fd1,&st) != 0) {
 466                         rsyserr(FERROR, errno, "fstat %s failed",
 467                                 full_fname(fnamecmp));
 468                         discard_receive_data(f_in, file->length);
 469                         close(fd1);
 470                         continue;
 471                 }
 472
 473                 if (fd1 != -1 && S_ISDIR(st.st_mode) && fnamecmp == fname) {
 474                         /* this special handling for directories
 475                          * wouldn't be necessary if robust_rename()
 476                          * and the underlying robust_unlink could cope
 477                          * with directories
 478                          */
 479                         rprintf(FERROR,"recv_files: %s is a directory\n",
 480                                 full_fname(fnamecmp));
 481                         discard_receive_data(f_in, file->length);
 482                         close(fd1);
 483                         continue;
 484                 }
 485
 486                 if (fd1 != -1 && !S_ISREG(st.st_mode)) {
 487                         close(fd1);
 488                         fd1 = -1;
 489                 }
 490
 491                 if (fd1 != -1 && !preserve_perms) {
 492                         /* if the file exists already and we aren't preserving
 493                          * permissions then act as though the remote end sent
 494                          * us the file permissions we already have */
 495                         file->mode = st.st_mode;
 496                 }
 497
 498                 /* We now check to see if we are writing file "inplace" */
 499                 if (inplace)  {
 500                         fd2 = do_open(fname, O_WRONLY|O_CREAT, 0);
 501                         if (fd2 == -1) {
 502                                 rsyserr(FERROR, errno, "open %s failed",
 503                                         full_fname(fname));
 504                                 discard_receive_data(f_in, file->length);
 505                                 if (fd1 != -1)
 506                                         close(fd1);
 507                                 continue;
 508                         }
 509                 } else {
 510                         if (!get_tmpname(fnametmp,fname)) {
 511                                 discard_receive_data(f_in, file->length);
 512                                 if (fd1 != -1)
 513                                         close(fd1);
 514                                 continue;
 515                         }
 516
 517                         strlcpy(template, fnametmp, sizeof template);
 518
 519                         /* we initially set the perms without the
 520                          * setuid/setgid bits to ensure that there is no race
 521                          * condition. They are then correctly updated after
 522                          * the lchown. Thanks to snabb@epipe.fi for pointing
 523                          * this out.  We also set it initially without group
 524                          * access because of a similar race condition. */
 525                         fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 526
 527                         /* in most cases parent directories will already exist
 528                          * because their information should have been previously
 529                          * transferred, but that may not be the case with -R */
 530                         if (fd2 == -1 && relative_paths && errno == ENOENT
 531                             && create_directory_path(fnametmp, orig_umask) == 0) {
 532                                 strlcpy(fnametmp, template, sizeof fnametmp);
 533                                 fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 534                         }
 535                         if (fd2 == -1) {
 536                                 rsyserr(FERROR, errno, "mkstemp %s failed",
 537                                         full_fname(fnametmp));
 538                                 discard_receive_data(f_in, file->length);
 539                                 if (fd1 != -1)
 540                                         close(fd1);
 541                                 continue;
 542                         }
 543
 544                         if (partialptr)
 545                                 cleanup_set(fnametmp, partialptr, file, fd1, fd2);
 546                 }
 547
 548                 if (!am_server && verbose) /* log the transfer */
 549                         rprintf(FINFO, "%s\n", safe_fname(fname));
 550
 551                 /* recv file data */
 552                 recv_ok = receive_data(f_in, fnamecmp, fd1, st.st_size,
 553                                        fname, fd2, file->length);
 554
 555                 log_recv(file, &initial_stats);
 556
 557                 if (fd1 != -1)
 558                         close(fd1);
 559                 if (close(fd2) < 0) {
 560                         rsyserr(FERROR, errno, "close failed on %s",
 561                                 full_fname(fnametmp));
 562                         exit_cleanup(RERR_FILEIO);
 563                 }
 564
 565                 if (recv_ok || inplace)
 566                         finish_transfer(fname, fnametmp, file, recv_ok);
 567                 else if (keep_partial && partialptr
 568                     && handle_partial_dir(partialptr, PDIR_CREATE))
 569                         finish_transfer(partialptr, fnametmp, file, 0);
 570                 else {
 571                         partialptr = NULL;
 572                         do_unlink(fnametmp);
 573                 }
 574
 575                 if (partialptr != fname && fnamecmp == partialptr && recv_ok) {
 576                         do_unlink(partialptr);
 577                         handle_partial_dir(partialptr, PDIR_DELETE);
 578                 }
 579
 580                 cleanup_disable();
 581
 582                 if (!recv_ok) {
 583                         int msgtype = csum_length == SUM_LENGTH || read_batch ?
 584                                 FERROR : FINFO;
 585                         if (msgtype == FERROR || verbose) {
 586                                 char *errstr, *redostr, *keptstr;
 587                                 if (!(keep_partial && partialptr) && !inplace)
 588                                         keptstr = "discarded";
 589                                 else if (partial_dir)
 590                                         keptstr = "put into partial-dir";
 591                                 else
 592                                         keptstr = "retained";
 593                                 if (msgtype == FERROR) {
 594                                         errstr = "ERROR";
 595                                         redostr = "";
 596                                 } else {
 597                                         errstr = "WARNING";
 598                                         redostr = " (will try again)";
 599                                 }
 600                                 rprintf(msgtype,
 601                                         "%s: %s failed verification -- update %s%s.\n",
 602                                         errstr, safe_fname(fname),
 603                                         keptstr, redostr);
 604                         }
 605                         if (csum_length != SUM_LENGTH) {
 606                                 char buf[4];
 607                                 SIVAL(buf, 0, i);
 608                                 send_msg(MSG_REDO, buf, 4);
 609                         }
 610                 }
 611         }
 612         make_backups = save_make_backups;
 613
 614         if (delete_after && recurse && !local_name && flist->count > 0)
 615                 delete_files(flist);
 616
 617         if (verbose > 2)
 618                 rprintf(FINFO,"recv_files finished\n");
 619
 620         return 0;
 621 }