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 relative_paths;
  34 extern int keep_dirlinks;
  35 extern int preserve_hard_links;
  36 extern int preserve_perms;
  37 extern int cvs_exclude;
  38 extern int io_error;
  39 extern char *tmpdir;
  40 extern char *partial_dir;
  41 extern char *compare_dest;
  42 extern int make_backups;
  43 extern int do_progress;
  44 extern char *backup_dir;
  45 extern char *backup_suffix;
  46 extern int backup_suffix_len;
  47 extern int cleanup_got_literal;
  48 extern int module_id;
  49 extern int ignore_errors;
  50 extern int orig_umask;
  51 extern int keep_partial;
  52 extern int checksum_seed;
  53 extern int inplace;
  54
  55 extern struct exclude_list_struct server_exclude_list;
  56
  57
  58 static void delete_one(char *fn, int is_dir)
  59 {
  60         if (!is_dir) {
  61                 if (robust_unlink(fn) != 0) {
  62                         rsyserr(FERROR, errno, "delete_one: unlink %s failed",
  63                                 full_fname(fn));
  64                 } else if (verbose)
  65                         rprintf(FINFO, "deleting %s\n", safe_fname(fn));
  66         } else {
  67                 if (do_rmdir(fn) != 0) {
  68                         if (errno != ENOTEMPTY && errno != EEXIST) {
  69                                 rsyserr(FERROR, errno,
  70                                         "delete_one: rmdir %s failed",
  71                                         full_fname(fn));
  72                         }
  73                 } else if (verbose) {
  74                         rprintf(FINFO, "deleting directory %s\n",
  75                                 safe_fname(fn));
  76                 }
  77         }
  78 }
  79
  80
  81 static int is_backup_file(char *fn)
  82 {
  83         int k = strlen(fn) - backup_suffix_len;
  84         return k > 0 && strcmp(fn+k, backup_suffix) == 0;
  85 }
  86
  87
  88 /* This deletes any files on the receiving side that are not present
  89  * on the sending side. */
  90 void delete_files(struct file_list *flist)
  91 {
  92         struct file_list *local_file_list;
  93         int i, j;
  94         char *argv[1], fbuf[MAXPATHLEN];
  95         static int deletion_count;
  96
  97         if (cvs_exclude)
  98                 add_cvs_excludes();
  99
 100         if (io_error && !(lp_ignore_errors(module_id) || ignore_errors)) {
 101                 rprintf(FINFO,"IO error encountered - skipping file deletion\n");
 102                 return;
 103         }
 104
 105         for (j = 0; j < flist->count; j++) {
 106                 if (!(flist->files[j]->flags & FLAG_TOP_DIR)
 107                     || !S_ISDIR(flist->files[j]->mode))
 108                         continue;
 109
 110                 argv[0] = f_name_to(flist->files[j], fbuf);
 111
 112                 if (!(local_file_list = send_file_list(-1, 1, argv)))
 113                         continue;
 114
 115                 if (verbose > 1)
 116                         rprintf(FINFO, "deleting in %s\n", safe_fname(fbuf));
 117
 118                 for (i = local_file_list->count-1; i >= 0; i--) {
 119                         if (max_delete && deletion_count >= max_delete)
 120                                 break;
 121                         if (!local_file_list->files[i]->basename)
 122                                 continue;
 123                         if (flist_find(flist,local_file_list->files[i]) < 0) {
 124                                 char *f = f_name(local_file_list->files[i]);
 125                                 int mode = local_file_list->files[i]->mode;
 126                                 if (make_backups && (backup_dir || !is_backup_file(f))
 127                                   && !S_ISDIR(mode)) {
 128                                         make_backup(f);
 129                                         if (verbose) {
 130                                                 rprintf(FINFO, "deleting %s\n",
 131                                                         safe_fname(f));
 132                                         }
 133                                 } else
 134                                         delete_one(f, S_ISDIR(mode) != 0);
 135                                 deletion_count++;
 136                         }
 137                 }
 138                 flist_free(local_file_list);
 139         }
 140 }
 141
 142
 143 /*
 144  * get_tmpname() - create a tmp filename for a given filename
 145  *
 146  *   If a tmpdir is defined, use that as the directory to
 147  *   put it in.  Otherwise, the tmp filename is in the same
 148  *   directory as the given name.  Note that there may be no
 149  *   directory at all in the given name!
 150  *
 151  *   The tmp filename is basically the given filename with a
 152  *   dot prepended, and .XXXXXX appended (for mkstemp() to
 153  *   put its unique gunk in).  Take care to not exceed
 154  *   either the MAXPATHLEN or NAME_MAX, esp. the last, as
 155  *   the basename basically becomes 8 chars longer. In that
 156  *   case, the original name is shortened sufficiently to
 157  *   make it all fit.
 158  *
 159  *   Of course, there's no real reason for the tmp name to
 160  *   look like the original, except to satisfy us humans.
 161  *   As long as it's unique, rsync will work.
 162  */
 163
 164 static int get_tmpname(char *fnametmp, char *fname)
 165 {
 166         char *f;
 167         int     length = 0;
 168         int     maxname;
 169
 170         if (tmpdir) {
 171                 /* Note: this can't overflow, so the return value is safe */
 172                 length = strlcpy(fnametmp, tmpdir, MAXPATHLEN - 2);
 173                 fnametmp[length++] = '/';
 174                 fnametmp[length] = '\0';        /* always NULL terminated */
 175         }
 176
 177         if ((f = strrchr(fname, '/')) != NULL) {
 178                 ++f;
 179                 if (!tmpdir) {
 180                         length = f - fname;
 181                         /* copy up to and including the slash */
 182                         strlcpy(fnametmp, fname, length + 1);
 183                 }
 184         } else
 185                 f = fname;
 186         fnametmp[length++] = '.';
 187         fnametmp[length] = '\0';                /* always NULL terminated */
 188
 189         maxname = MIN(MAXPATHLEN - 7 - length, NAME_MAX - 8);
 190
 191         if (maxname < 1) {
 192                 rprintf(FERROR, "temporary filename too long: %s\n", fname);
 193                 fnametmp[0] = '\0';
 194                 return 0;
 195         }
 196
 197         strlcpy(fnametmp + length, f, maxname);
 198         strcat(fnametmp + length, ".XXXXXX");
 199
 200         return 1;
 201 }
 202
 203
 204 static int receive_data(int f_in, char *fname_r, int fd_r, OFF_T size_r,
 205                         char *fname, int fd, OFF_T total_size)
 206 {
 207         static char file_sum1[MD4_SUM_LENGTH];
 208         static char file_sum2[MD4_SUM_LENGTH];
 209         struct map_struct *mapbuf;
 210         struct sum_struct sum;
 211         unsigned int len;
 212         OFF_T offset = 0;
 213         OFF_T offset2;
 214         char *data;
 215         int i;
 216         char *map = NULL;
 217
 218         read_sum_head(f_in, &sum);
 219
 220         if (fd_r >= 0 && size_r > 0) {
 221                 OFF_T map_size = MAX(sum.blength * 2, 16*1024);
 222                 mapbuf = map_file(fd_r, size_r, map_size, sum.blength);
 223                 if (verbose > 2) {
 224                         rprintf(FINFO, "recv mapped %s of size %.0f\n",
 225                                 safe_fname(fname_r), (double)size_r);
 226                 }
 227         } else
 228                 mapbuf = NULL;
 229
 230         sum_init(checksum_seed);
 231
 232         while ((i = recv_token(f_in, &data)) != 0) {
 233                 if (do_progress)
 234                         show_progress(offset, total_size);
 235
 236                 if (i > 0) {
 237                         if (verbose > 3) {
 238                                 rprintf(FINFO,"data recv %d at %.0f\n",
 239                                         i,(double)offset);
 240                         }
 241
 242                         stats.literal_data += i;
 243                         cleanup_got_literal = 1;
 244
 245                         sum_update(data,i);
 246
 247                         if (fd != -1 && write_file(fd,data,i) != i)
 248                                 goto report_write_error;
 249                         offset += i;
 250                         continue;
 251                 }
 252
 253                 i = -(i+1);
 254                 offset2 = i*(OFF_T)sum.blength;
 255                 len = sum.blength;
 256                 if (i == (int)sum.count-1 && sum.remainder != 0)
 257                         len = sum.remainder;
 258
 259                 stats.matched_data += len;
 260
 261                 if (verbose > 3)
 262                         rprintf(FINFO,"chunk[%d] of size %d at %.0f offset=%.0f\n",
 263                                 i,len,(double)offset2,(double)offset);
 264
 265                 if (mapbuf) {
 266                         map = map_ptr(mapbuf,offset2,len);
 267
 268                         see_token(map, len);
 269                         sum_update(map,len);
 270                 }
 271
 272                 if (inplace) {
 273                         if (offset == offset2 && fd != -1) {
 274                                 if (flush_write_file(fd) < 0)
 275                                         goto report_write_error;
 276                                 offset += len;
 277                                 if (do_lseek(fd, len, SEEK_CUR) != offset) {
 278                                         rsyserr(FERROR, errno,
 279                                                 "lseek failed on %s",
 280                                                 full_fname(fname));
 281                                         exit_cleanup(RERR_FILEIO);
 282                                 }
 283                                 continue;
 284                         }
 285                 }
 286                 if (fd != -1 && write_file(fd, map, len) != (int)len)
 287                         goto report_write_error;
 288                 offset += len;
 289         }
 290
 291         flush_write_file(fd);
 292
 293 #ifdef HAVE_FTRUNCATE
 294         if (inplace && fd != -1)
 295                 ftruncate(fd, offset);
 296 #endif
 297
 298         if (do_progress)
 299                 end_progress(total_size);
 300
 301         if (fd != -1 && offset > 0 && sparse_end(fd) != 0) {
 302             report_write_error:
 303                 rsyserr(FERROR, errno, "write failed on %s",
 304                         full_fname(fname));
 305                 exit_cleanup(RERR_FILEIO);
 306         }
 307
 308         sum_end(file_sum1);
 309
 310         if (mapbuf)
 311                 unmap_file(mapbuf);
 312
 313         read_buf(f_in,file_sum2,MD4_SUM_LENGTH);
 314         if (verbose > 2)
 315                 rprintf(FINFO,"got file_sum\n");
 316         if (fd != -1 && memcmp(file_sum1, file_sum2, MD4_SUM_LENGTH) != 0)
 317                 return 0;
 318         return 1;
 319 }
 320
 321
 322 static void discard_receive_data(int f_in, OFF_T length)
 323 {
 324         receive_data(f_in, NULL, -1, 0, NULL, -1, length);
 325 }
 326
 327
 328 /**
 329  * main routine for receiver process.
 330  *
 331  * Receiver process runs on the same host as the generator process. */
 332 int recv_files(int f_in, struct file_list *flist, char *local_name)
 333 {
 334         int next_gen_i = -1;
 335         int fd1,fd2;
 336         STRUCT_STAT st;
 337         char *fname, fbuf[MAXPATHLEN];
 338         char template[MAXPATHLEN];
 339         char fnametmp[MAXPATHLEN];
 340         char *fnamecmp, *partialptr;
 341         char fnamecmpbuf[MAXPATHLEN];
 342         struct file_struct *file;
 343         struct stats initial_stats;
 344         int save_make_backups = make_backups;
 345         int i, recv_ok, phase = 0;
 346
 347         if (verbose > 2)
 348                 rprintf(FINFO,"recv_files(%d) starting\n",flist->count);
 349
 350         if (flist->hlink_pool) {
 351                 pool_destroy(flist->hlink_pool);
 352                 flist->hlink_pool = NULL;
 353         }
 354
 355         while (1) {
 356                 cleanup_disable();
 357
 358                 i = read_int(f_in);
 359                 if (i == -1) {
 360                         if (read_batch) {
 361                                 if (next_gen_i != flist->count)
 362                                         while (read_int(batch_gen_fd) != -1) {}
 363                                 next_gen_i = -1;
 364                         }
 365
 366                         if (phase)
 367                                 break;
 368
 369                         phase = 1;
 370                         csum_length = SUM_LENGTH;
 371                         if (verbose > 2)
 372                                 rprintf(FINFO, "recv_files phase=%d\n", phase);
 373                         send_msg(MSG_DONE, "", 0);
 374                         if (keep_partial)
 375                                 make_backups = 0; /* prevents double backup */
 376                         continue;
 377                 }
 378
 379                 if (i < 0 || i >= flist->count) {
 380                         rprintf(FERROR,"Invalid file index %d in recv_files (count=%d)\n",
 381                                 i, flist->count);
 382                         exit_cleanup(RERR_PROTOCOL);
 383                 }
 384
 385                 file = flist->files[i];
 386
 387                 stats.current_file_index = i;
 388                 stats.num_transferred_files++;
 389                 stats.total_transferred_size += file->length;
 390                 cleanup_got_literal = 0;
 391
 392                 if (local_name)
 393                         fname = local_name;
 394                 else
 395                         fname = f_name_to(file, fbuf);
 396
 397                 if (dry_run) {
 398                         if (!am_server && verbose) /* log the transfer */
 399                                 rprintf(FINFO, "%s\n", safe_fname(fname));
 400                         continue;
 401                 }
 402
 403                 initial_stats = stats;
 404
 405                 if (verbose > 2)
 406                         rprintf(FINFO, "recv_files(%s)\n", safe_fname(fname));
 407
 408                 if (read_batch) {
 409                         while (i > next_gen_i) {
 410                                 next_gen_i = read_int(batch_gen_fd);
 411                                 if (next_gen_i == -1)
 412                                         next_gen_i = flist->count;
 413                         }
 414                         if (i < next_gen_i) {
 415                                 rprintf(FINFO, "skipping update for \"%s\"\n",
 416                                         safe_fname(fname));
 417                                 discard_receive_data(f_in, file->length);
 418                                 continue;
 419                         }
 420                 }
 421
 422                 if (server_exclude_list.head
 423                     && check_exclude(&server_exclude_list, fname,
 424                                      S_ISDIR(file->mode)) < 0) {
 425                         rprintf(FERROR, "attempt to hack rsync failed.\n");
 426                         exit_cleanup(RERR_PROTOCOL);
 427                 }
 428
 429                 if (partial_dir) {
 430                         if ((partialptr = partial_dir_fname(fname)) != NULL)
 431                                 fnamecmp = partialptr;
 432                         else
 433                                 fnamecmp = fname;
 434                 } else
 435                         fnamecmp = partialptr = fname;
 436
 437                 if (inplace && make_backups) {
 438                         if (!(fnamecmp = get_backup_name(fname)))
 439                                 fnamecmp = partialptr;
 440                 }
 441
 442                 /* open the file */
 443                 fd1 = do_open(fnamecmp, O_RDONLY, 0);
 444
 445                 if (fd1 == -1 && fnamecmp != fname) {
 446                         fnamecmp = fname;
 447                         fd1 = do_open(fnamecmp, O_RDONLY, 0);
 448                 }
 449
 450                 if (fd1 == -1 && compare_dest != NULL) {
 451                         /* try the file at compare_dest instead */
 452                         pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 453                                  compare_dest, fname);
 454                         fnamecmp = fnamecmpbuf;
 455                         fd1 = do_open(fnamecmp, O_RDONLY, 0);
 456                 }
 457
 458                 if (fd1 != -1 && do_fstat(fd1,&st) != 0) {
 459                         rsyserr(FERROR, errno, "fstat %s failed",
 460                                 full_fname(fnamecmp));
 461                         discard_receive_data(f_in, file->length);
 462                         close(fd1);
 463                         continue;
 464                 }
 465
 466                 if (fd1 != -1 && S_ISDIR(st.st_mode) && fnamecmp == fname) {
 467                         /* this special handling for directories
 468                          * wouldn't be necessary if robust_rename()
 469                          * and the underlying robust_unlink could cope
 470                          * with directories
 471                          */
 472                         rprintf(FERROR,"recv_files: %s is a directory\n",
 473                                 full_fname(fnamecmp));
 474                         discard_receive_data(f_in, file->length);
 475                         close(fd1);
 476                         continue;
 477                 }
 478
 479                 if (fd1 != -1 && !S_ISREG(st.st_mode)) {
 480                         close(fd1);
 481                         fd1 = -1;
 482                 }
 483
 484                 if (fd1 != -1 && !preserve_perms) {
 485                         /* if the file exists already and we aren't preserving
 486                          * permissions then act as though the remote end sent
 487                          * us the file permissions we already have */
 488                         file->mode = st.st_mode;
 489                 }
 490
 491                 /* We now check to see if we are writing file "inplace" */
 492                 if (inplace)  {
 493                         fd2 = do_open(fname, O_WRONLY|O_CREAT, 0);
 494                         if (fd2 == -1) {
 495                                 rsyserr(FERROR, errno, "open %s failed",
 496                                         full_fname(fname));
 497                                 discard_receive_data(f_in, file->length);
 498                                 if (fd1 != -1)
 499                                         close(fd1);
 500                                 continue;
 501                         }
 502                 } else {
 503                         if (!get_tmpname(fnametmp,fname)) {
 504                                 discard_receive_data(f_in, file->length);
 505                                 if (fd1 != -1)
 506                                         close(fd1);
 507                                 continue;
 508                         }
 509
 510                         strlcpy(template, fnametmp, sizeof template);
 511
 512                         /* we initially set the perms without the
 513                          * setuid/setgid bits to ensure that there is no race
 514                          * condition. They are then correctly updated after
 515                          * the lchown. Thanks to snabb@epipe.fi for pointing
 516                          * this out.  We also set it initially without group
 517                          * access because of a similar race condition. */
 518                         fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 519
 520                         /* in most cases parent directories will already exist
 521                          * because their information should have been previously
 522                          * transferred, but that may not be the case with -R */
 523                         if (fd2 == -1 && relative_paths && errno == ENOENT
 524                             && create_directory_path(fnametmp, orig_umask) == 0) {
 525                                 strlcpy(fnametmp, template, sizeof fnametmp);
 526                                 fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 527                         }
 528                         if (fd2 == -1) {
 529                                 rsyserr(FERROR, errno, "mkstemp %s failed",
 530                                         full_fname(fnametmp));
 531                                 discard_receive_data(f_in, file->length);
 532                                 if (fd1 != -1)
 533                                         close(fd1);
 534                                 continue;
 535                         }
 536
 537                         if (partialptr)
 538                                 cleanup_set(fnametmp, partialptr, file, fd1, fd2);
 539                 }
 540
 541                 if (!am_server && verbose) /* log the transfer */
 542                         rprintf(FINFO, "%s\n", safe_fname(fname));
 543
 544                 /* recv file data */
 545                 recv_ok = receive_data(f_in, fnamecmp, fd1, st.st_size,
 546                                        fname, fd2, file->length);
 547
 548                 log_recv(file, &initial_stats);
 549
 550                 if (fd1 != -1)
 551                         close(fd1);
 552                 if (close(fd2) < 0) {
 553                         rsyserr(FERROR, errno, "close failed on %s",
 554                                 full_fname(fnametmp));
 555                         exit_cleanup(RERR_FILEIO);
 556                 }
 557
 558                 if (recv_ok || inplace)
 559                         finish_transfer(fname, fnametmp, file, recv_ok);
 560                 else if (keep_partial && partialptr
 561                     && handle_partial_dir(partialptr, PDIR_CREATE))
 562                         finish_transfer(partialptr, fnametmp, file, 0);
 563                 else {
 564                         partialptr = NULL;
 565                         do_unlink(fnametmp);
 566                 }
 567
 568                 if (partialptr != fname && fnamecmp == partialptr && recv_ok) {
 569                         do_unlink(partialptr);
 570                         handle_partial_dir(partialptr, PDIR_DELETE);
 571                 }
 572
 573                 cleanup_disable();
 574
 575                 if (!recv_ok) {
 576                         int msgtype = csum_length == SUM_LENGTH || read_batch ?
 577                                 FERROR : FINFO;
 578                         if (msgtype == FERROR || verbose) {
 579                                 char *errstr, *redostr, *keptstr;
 580                                 if (!(keep_partial && partialptr) && !inplace)
 581                                         keptstr = "discarded";
 582                                 else if (partial_dir)
 583                                         keptstr = "put into partial-dir";
 584                                 else
 585                                         keptstr = "retained";
 586                                 if (msgtype == FERROR) {
 587                                         errstr = "ERROR";
 588                                         redostr = "";
 589                                 } else {
 590                                         errstr = "WARNING";
 591                                         redostr = " (will try again)";
 592                                 }
 593                                 rprintf(msgtype,
 594                                         "%s: %s failed verification -- update %s%s.\n",
 595                                         errstr, safe_fname(fname),
 596                                         keptstr, redostr);
 597                         }
 598                         if (csum_length != SUM_LENGTH) {
 599                                 char buf[4];
 600                                 SIVAL(buf, 0, i);
 601                                 send_msg(MSG_REDO, buf, 4);
 602                         }
 603                 }
 604         }
 605         make_backups = save_make_backups;
 606
 607         if (delete_after && recurse && !local_name && flist->count > 0)
 608                 delete_files(flist);
 609
 610         if (verbose > 2)
 611                 rprintf(FINFO,"recv_files finished\n");
 612
 613         return 0;
 614 }