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