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