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 *basis_dir[];
  43 extern int basis_dir_cnt;
  44 extern int make_backups;
  45 extern int do_progress;
  46 extern char *backup_dir;
  47 extern char *backup_suffix;
  48 extern int backup_suffix_len;
  49 extern int cleanup_got_literal;
  50 extern int module_id;
  51 extern int ignore_errors;
  52 extern int orig_umask;
  53 extern int keep_partial;
  54 extern int checksum_seed;
  55 extern int inplace;
  56
  57 extern struct exclude_list_struct server_exclude_list;
  58
  59
  60 static int is_backup_file(char *fn)
  61 {
  62         int k = strlen(fn) - backup_suffix_len;
  63         return k > 0 && strcmp(fn+k, backup_suffix) == 0;
  64 }
  65
  66
  67 /* This deletes any files on the receiving side that are not present
  68  * on the sending side. */
  69 void delete_files(struct file_list *flist)
  70 {
  71         struct file_list *local_file_list;
  72         int i, j;
  73         char *argv[1], fbuf[MAXPATHLEN];
  74         static int deletion_count;
  75
  76         if (cvs_exclude)
  77                 add_cvs_excludes();
  78
  79         if (io_error && !(lp_ignore_errors(module_id) || ignore_errors)) {
  80                 rprintf(FINFO,"IO error encountered - skipping file deletion\n");
  81                 return;
  82         }
  83
  84         for (j = 0; j < flist->count; j++) {
  85                 if (!(flist->files[j]->flags & FLAG_TOP_DIR)
  86                     || !S_ISDIR(flist->files[j]->mode))
  87                         continue;
  88
  89                 argv[0] = f_name_to(flist->files[j], fbuf);
  90
  91                 if (!(local_file_list = send_file_list(-1, 1, argv)))
  92                         continue;
  93
  94                 if (verbose > 1)
  95                         rprintf(FINFO, "deleting in %s\n", safe_fname(fbuf));
  96
  97                 for (i = local_file_list->count-1; i >= 0; i--) {
  98                         if (max_delete && deletion_count >= max_delete)
  99                                 break;
 100                         if (!local_file_list->files[i]->basename)
 101                                 continue;
 102                         if (flist_find(flist,local_file_list->files[i]) < 0) {
 103                                 char *f = f_name(local_file_list->files[i]);
 104                                 int mode = local_file_list->files[i]->mode;
 105                                 if (make_backups && (backup_dir || !is_backup_file(f))
 106                                   && !S_ISDIR(mode)) {
 107                                         make_backup(f);
 108                                         if (verbose) {
 109                                                 rprintf(FINFO, "deleting %s\n",
 110                                                         safe_fname(f));
 111                                         }
 112                                 } else {
 113                                         delete_file(f, S_ISDIR(mode)
 114                                                 ? DEL_DIR | DEL_RECURSE : 0);
 115                                 }
 116                                 deletion_count++;
 117                         }
 118                 }
 119                 flist_free(local_file_list);
 120         }
 121 }
 122
 123
 124 /*
 125  * get_tmpname() - create a tmp filename for a given filename
 126  *
 127  *   If a tmpdir is defined, use that as the directory to
 128  *   put it in.  Otherwise, the tmp filename is in the same
 129  *   directory as the given name.  Note that there may be no
 130  *   directory at all in the given name!
 131  *
 132  *   The tmp filename is basically the given filename with a
 133  *   dot prepended, and .XXXXXX appended (for mkstemp() to
 134  *   put its unique gunk in).  Take care to not exceed
 135  *   either the MAXPATHLEN or NAME_MAX, esp. the last, as
 136  *   the basename basically becomes 8 chars longer. In that
 137  *   case, the original name is shortened sufficiently to
 138  *   make it all fit.
 139  *
 140  *   Of course, there's no real reason for the tmp name to
 141  *   look like the original, except to satisfy us humans.
 142  *   As long as it's unique, rsync will work.
 143  */
 144
 145 static int get_tmpname(char *fnametmp, char *fname)
 146 {
 147         char *f;
 148         int     length = 0;
 149         int     maxname;
 150
 151         if (tmpdir) {
 152                 /* Note: this can't overflow, so the return value is safe */
 153                 length = strlcpy(fnametmp, tmpdir, MAXPATHLEN - 2);
 154                 fnametmp[length++] = '/';
 155                 fnametmp[length] = '\0';        /* always NULL terminated */
 156         }
 157
 158         if ((f = strrchr(fname, '/')) != NULL) {
 159                 ++f;
 160                 if (!tmpdir) {
 161                         length = f - fname;
 162                         /* copy up to and including the slash */
 163                         strlcpy(fnametmp, fname, length + 1);
 164                 }
 165         } else
 166                 f = fname;
 167         fnametmp[length++] = '.';
 168         fnametmp[length] = '\0';                /* always NULL terminated */
 169
 170         maxname = MIN(MAXPATHLEN - 7 - length, NAME_MAX - 8);
 171
 172         if (maxname < 1) {
 173                 rprintf(FERROR, "temporary filename too long: %s\n", fname);
 174                 fnametmp[0] = '\0';
 175                 return 0;
 176         }
 177
 178         strlcpy(fnametmp + length, f, maxname);
 179         strcat(fnametmp + length, ".XXXXXX");
 180
 181         return 1;
 182 }
 183
 184
 185 static int receive_data(int f_in, char *fname_r, int fd_r, OFF_T size_r,
 186                         char *fname, int fd, OFF_T total_size)
 187 {
 188         static char file_sum1[MD4_SUM_LENGTH];
 189         static char file_sum2[MD4_SUM_LENGTH];
 190         struct map_struct *mapbuf;
 191         struct sum_struct sum;
 192         int32 len;
 193         OFF_T offset = 0;
 194         OFF_T offset2;
 195         char *data;
 196         int32 i;
 197         char *map = NULL;
 198
 199         read_sum_head(f_in, &sum);
 200
 201         if (fd_r >= 0 && size_r > 0) {
 202                 int32 read_size = MAX(sum.blength * 2, 16*1024);
 203                 mapbuf = map_file(fd_r, size_r, read_size, sum.blength);
 204                 if (verbose > 2) {
 205                         rprintf(FINFO, "recv mapped %s of size %.0f\n",
 206                                 safe_fname(fname_r), (double)size_r);
 207                 }
 208         } else
 209                 mapbuf = NULL;
 210
 211         sum_init(checksum_seed);
 212
 213         while ((i = recv_token(f_in, &data)) != 0) {
 214                 if (do_progress)
 215                         show_progress(offset, total_size);
 216
 217                 if (i > 0) {
 218                         if (verbose > 3) {
 219                                 rprintf(FINFO,"data recv %d at %.0f\n",
 220                                         i,(double)offset);
 221                         }
 222
 223                         stats.literal_data += i;
 224                         cleanup_got_literal = 1;
 225
 226                         sum_update(data, i);
 227
 228                         if (fd != -1 && write_file(fd,data,i) != i)
 229                                 goto report_write_error;
 230                         offset += i;
 231                         continue;
 232                 }
 233
 234                 i = -(i+1);
 235                 offset2 = i * (OFF_T)sum.blength;
 236                 len = sum.blength;
 237                 if (i == (int)sum.count-1 && sum.remainder != 0)
 238                         len = sum.remainder;
 239
 240                 stats.matched_data += len;
 241
 242                 if (verbose > 3) {
 243                         rprintf(FINFO,
 244                                 "chunk[%d] of size %ld at %.0f offset=%.0f\n",
 245                                 i, (long)len, (double)offset2, (double)offset);
 246                 }
 247
 248                 if (mapbuf) {
 249                         map = map_ptr(mapbuf,offset2,len);
 250
 251                         see_token(map, len);
 252                         sum_update(map, len);
 253                 }
 254
 255                 if (inplace) {
 256                         if (offset == offset2 && fd != -1) {
 257                                 if (flush_write_file(fd) < 0)
 258                                         goto report_write_error;
 259                                 offset += len;
 260                                 if (do_lseek(fd, len, SEEK_CUR) != offset) {
 261                                         rsyserr(FERROR, errno,
 262                                                 "lseek failed on %s",
 263                                                 full_fname(fname));
 264                                         exit_cleanup(RERR_FILEIO);
 265                                 }
 266                                 continue;
 267                         }
 268                 }
 269                 if (fd != -1 && write_file(fd, map, len) != (int)len)
 270                         goto report_write_error;
 271                 offset += len;
 272         }
 273
 274         if (flush_write_file(fd) < 0)
 275                 goto report_write_error;
 276
 277 #ifdef HAVE_FTRUNCATE
 278         if (inplace && fd != -1)
 279                 ftruncate(fd, offset);
 280 #endif
 281
 282         if (do_progress)
 283                 end_progress(total_size);
 284
 285         if (fd != -1 && offset > 0 && sparse_end(fd) != 0) {
 286             report_write_error:
 287                 rsyserr(FERROR, errno, "write failed on %s",
 288                         full_fname(fname));
 289                 exit_cleanup(RERR_FILEIO);
 290         }
 291
 292         sum_end(file_sum1);
 293
 294         if (mapbuf)
 295                 unmap_file(mapbuf);
 296
 297         read_buf(f_in,file_sum2,MD4_SUM_LENGTH);
 298         if (verbose > 2)
 299                 rprintf(FINFO,"got file_sum\n");
 300         if (fd != -1 && memcmp(file_sum1, file_sum2, MD4_SUM_LENGTH) != 0)
 301                 return 0;
 302         return 1;
 303 }
 304
 305
 306 static void discard_receive_data(int f_in, OFF_T length)
 307 {
 308         receive_data(f_in, NULL, -1, 0, NULL, -1, length);
 309 }
 310
 311
 312 /**
 313  * main routine for receiver process.
 314  *
 315  * Receiver process runs on the same host as the generator process. */
 316 int recv_files(int f_in, struct file_list *flist, char *local_name,
 317                int f_in_name)
 318 {
 319         int next_gen_i = -1;
 320         int fd1,fd2;
 321         STRUCT_STAT st;
 322         char *fname, fbuf[MAXPATHLEN];
 323         char template[MAXPATHLEN];
 324         char fnametmp[MAXPATHLEN];
 325         char *fnamecmp, *partialptr;
 326         char fnamecmpbuf[MAXPATHLEN];
 327         struct file_struct *file;
 328         struct stats initial_stats;
 329         int save_make_backups = make_backups;
 330         int i, recv_ok, phase = 0;
 331
 332         if (verbose > 2)
 333                 rprintf(FINFO,"recv_files(%d) starting\n",flist->count);
 334
 335         if (flist->hlink_pool) {
 336                 pool_destroy(flist->hlink_pool);
 337                 flist->hlink_pool = NULL;
 338         }
 339
 340         while (1) {
 341                 cleanup_disable();
 342
 343                 i = read_int(f_in);
 344                 if (i == -1) {
 345                         if (read_batch) {
 346                                 if (next_gen_i != flist->count) {
 347                                         do {
 348                                                 if (f_in_name >= 0
 349                                                     && next_gen_i >= 0)
 350                                                         read_byte(f_in_name);
 351                                         } while (read_int(batch_gen_fd) != -1);
 352                                 }
 353                                 next_gen_i = -1;
 354                         }
 355
 356                         if (phase)
 357                                 break;
 358
 359                         phase = 1;
 360                         csum_length = SUM_LENGTH;
 361                         if (verbose > 2)
 362                                 rprintf(FINFO, "recv_files phase=%d\n", phase);
 363                         send_msg(MSG_DONE, "", 0);
 364                         if (keep_partial && !partial_dir)
 365                                 make_backups = 0; /* prevents double backup */
 366                         continue;
 367                 }
 368
 369                 if (i < 0 || i >= flist->count) {
 370                         rprintf(FERROR,"Invalid file index %d in recv_files (count=%d)\n",
 371                                 i, flist->count);
 372                         exit_cleanup(RERR_PROTOCOL);
 373                 }
 374
 375                 file = flist->files[i];
 376
 377                 stats.current_file_index = i;
 378                 stats.num_transferred_files++;
 379                 stats.total_transferred_size += file->length;
 380                 cleanup_got_literal = 0;
 381
 382                 if (local_name)
 383                         fname = local_name;
 384                 else
 385                         fname = f_name_to(file, fbuf);
 386
 387                 if (dry_run) {
 388                         if (!am_server && verbose) /* log the transfer */
 389                                 rprintf(FINFO, "%s\n", safe_fname(fname));
 390                         continue;
 391                 }
 392
 393                 initial_stats = stats;
 394
 395                 if (verbose > 2)
 396                         rprintf(FINFO, "recv_files(%s)\n", safe_fname(fname));
 397
 398                 if (read_batch) {
 399                         while (i > next_gen_i) {
 400                                 if (f_in_name >= 0 && next_gen_i >= 0)
 401                                         read_byte(f_in_name);
 402                                 next_gen_i = read_int(batch_gen_fd);
 403                                 if (next_gen_i == -1)
 404                                         next_gen_i = flist->count;
 405                         }
 406                         if (i < next_gen_i) {
 407                                 rprintf(FINFO, "skipping update for \"%s\"\n",
 408                                         safe_fname(fname));
 409                                 discard_receive_data(f_in, file->length);
 410                                 continue;
 411                         }
 412                         next_gen_i = -1;
 413                 }
 414
 415                 if (server_exclude_list.head
 416                     && check_exclude(&server_exclude_list, fname,
 417                                      S_ISDIR(file->mode)) < 0) {
 418                         rprintf(FERROR, "attempt to hack rsync failed.\n");
 419                         exit_cleanup(RERR_PROTOCOL);
 420                 }
 421
 422                 partialptr = partial_dir ? partial_dir_fname(fname) : fname;
 423
 424                 if (f_in_name >= 0) {
 425                         uchar j;
 426                         switch (j = read_byte(f_in_name)) {
 427                         case FNAMECMP_FNAME:
 428                                 fnamecmp = fname;
 429                                 break;
 430                         case FNAMECMP_PARTIAL_DIR:
 431                                 fnamecmp = partialptr ? partialptr : fname;
 432                                 break;
 433                         case FNAMECMP_BACKUP:
 434                                 fnamecmp = get_backup_name(fname);
 435                                 break;
 436                         default:
 437                                 if (j >= basis_dir_cnt) {
 438                                         rprintf(FERROR,
 439                                                 "invalid basis_dir index: %d.\n",
 440                                                 j);
 441                                         exit_cleanup(RERR_PROTOCOL);
 442                                 }
 443                                 pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 444                                          basis_dir[j], fname);
 445                                 fnamecmp = fnamecmpbuf;
 446                                 break;
 447                         }
 448                 } else
 449                         fnamecmp = fname;
 450
 451                 /* open the file */
 452                 fd1 = do_open(fnamecmp, O_RDONLY, 0);
 453
 454                 if (fd1 != -1 && do_fstat(fd1,&st) != 0) {
 455                         rsyserr(FERROR, errno, "fstat %s failed",
 456                                 full_fname(fnamecmp));
 457                         discard_receive_data(f_in, file->length);
 458                         close(fd1);
 459                         continue;
 460                 }
 461
 462                 if (fd1 != -1 && S_ISDIR(st.st_mode) && fnamecmp == fname) {
 463                         /* this special handling for directories
 464                          * wouldn't be necessary if robust_rename()
 465                          * and the underlying robust_unlink could cope
 466                          * with directories
 467                          */
 468                         rprintf(FERROR,"recv_files: %s is a directory\n",
 469                                 full_fname(fnamecmp));
 470                         discard_receive_data(f_in, file->length);
 471                         close(fd1);
 472                         continue;
 473                 }
 474
 475                 if (fd1 != -1 && !S_ISREG(st.st_mode)) {
 476                         close(fd1);
 477                         fd1 = -1;
 478                 }
 479
 480                 if (fd1 != -1 && !preserve_perms) {
 481                         /* if the file exists already and we aren't preserving
 482                          * permissions then act as though the remote end sent
 483                          * us the file permissions we already have */
 484                         file->mode = st.st_mode;
 485                 }
 486
 487                 /* We now check to see if we are writing file "inplace" */
 488                 if (inplace)  {
 489                         fd2 = do_open(fname, O_WRONLY|O_CREAT, 0);
 490                         if (fd2 == -1) {
 491                                 rsyserr(FERROR, errno, "open %s failed",
 492                                         full_fname(fname));
 493                                 discard_receive_data(f_in, file->length);
 494                                 if (fd1 != -1)
 495                                         close(fd1);
 496                                 continue;
 497                         }
 498                 } else {
 499                         if (!get_tmpname(fnametmp,fname)) {
 500                                 discard_receive_data(f_in, file->length);
 501                                 if (fd1 != -1)
 502                                         close(fd1);
 503                                 continue;
 504                         }
 505
 506                         strlcpy(template, fnametmp, sizeof template);
 507
 508                         /* we initially set the perms without the
 509                          * setuid/setgid bits to ensure that there is no race
 510                          * condition. They are then correctly updated after
 511                          * the lchown. Thanks to snabb@epipe.fi for pointing
 512                          * this out.  We also set it initially without group
 513                          * access because of a similar race condition. */
 514                         fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 515
 516                         /* in most cases parent directories will already exist
 517                          * because their information should have been previously
 518                          * transferred, but that may not be the case with -R */
 519                         if (fd2 == -1 && relative_paths && errno == ENOENT
 520                             && create_directory_path(fnametmp, orig_umask) == 0) {
 521                                 strlcpy(fnametmp, template, sizeof fnametmp);
 522                                 fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 523                         }
 524                         if (fd2 == -1) {
 525                                 rsyserr(FERROR, errno, "mkstemp %s failed",
 526                                         full_fname(fnametmp));
 527                                 discard_receive_data(f_in, file->length);
 528                                 if (fd1 != -1)
 529                                         close(fd1);
 530                                 continue;
 531                         }
 532
 533                         if (partialptr)
 534                                 cleanup_set(fnametmp, partialptr, file, fd1, fd2);
 535                 }
 536
 537                 if (!am_server && verbose) /* log the transfer */
 538                         rprintf(FINFO, "%s\n", safe_fname(fname));
 539
 540                 /* recv file data */
 541                 recv_ok = receive_data(f_in, fnamecmp, fd1, st.st_size,
 542                                        fname, fd2, file->length);
 543
 544                 log_recv(file, &initial_stats);
 545
 546                 if (fd1 != -1)
 547                         close(fd1);
 548                 if (close(fd2) < 0) {
 549                         rsyserr(FERROR, errno, "close failed on %s",
 550                                 full_fname(fnametmp));
 551                         exit_cleanup(RERR_FILEIO);
 552                 }
 553
 554                 if (recv_ok || inplace) {
 555                         finish_transfer(fname, fnametmp, file, recv_ok, 1);
 556                         if (partialptr != fname && fnamecmp == partialptr) {
 557                                 do_unlink(partialptr);
 558                                 handle_partial_dir(partialptr, PDIR_DELETE);
 559                         }
 560                 } else if (keep_partial && partialptr
 561                     && handle_partial_dir(partialptr, PDIR_CREATE)) {
 562                         finish_transfer(partialptr, fnametmp, file, recv_ok,
 563                                         !partial_dir);
 564                 } else {
 565                         partialptr = NULL;
 566                         do_unlink(fnametmp);
 567                 }
 568
 569                 cleanup_disable();
 570
 571                 if (!recv_ok) {
 572                         int msgtype = csum_length == SUM_LENGTH || read_batch ?
 573                                 FERROR : FINFO;
 574                         if (msgtype == FERROR || verbose) {
 575                                 char *errstr, *redostr, *keptstr;
 576                                 if (!(keep_partial && partialptr) && !inplace)
 577                                         keptstr = "discarded";
 578                                 else if (partial_dir)
 579                                         keptstr = "put into partial-dir";
 580                                 else
 581                                         keptstr = "retained";
 582                                 if (msgtype == FERROR) {
 583                                         errstr = "ERROR";
 584                                         redostr = "";
 585                                 } else {
 586                                         errstr = "WARNING";
 587                                         redostr = " (will try again)";
 588                                 }
 589                                 rprintf(msgtype,
 590                                         "%s: %s failed verification -- update %s%s.\n",
 591                                         errstr, safe_fname(fname),
 592                                         keptstr, redostr);
 593                         }
 594                         if (csum_length != SUM_LENGTH) {
 595                                 char buf[4];
 596                                 SIVAL(buf, 0, i);
 597                                 send_msg(MSG_REDO, buf, 4);
 598                         }
 599                 }
 600         }
 601         make_backups = save_make_backups;
 602
 603         if (delete_after && recurse && !local_name && flist->count > 0)
 604                 delete_files(flist);
 605
 606         if (verbose > 2)
 607                 rprintf(FINFO,"recv_files finished\n");
 608
 609         return 0;
 610 }