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