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 what_has_changed;
  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                 struct file_struct *file = flist->files[j];
  65
  66                 if (!(file->flags & FLAG_DEL_HERE))
  67                         continue;
  68
  69                 f_name_to(file, fbuf);
  70                 if (verbose > 1 && file->flags & FLAG_TOP_DIR)
  71                         rprintf(FINFO, "deleting in %s\n", safe_fname(fbuf));
  72
  73                 delete_in_dir(flist, fbuf, file);
  74         }
  75 }
  76
  77
  78 /*
  79  * get_tmpname() - create a tmp filename for a given filename
  80  *
  81  *   If a tmpdir is defined, use that as the directory to
  82  *   put it in.  Otherwise, the tmp filename is in the same
  83  *   directory as the given name.  Note that there may be no
  84  *   directory at all in the given name!
  85  *
  86  *   The tmp filename is basically the given filename with a
  87  *   dot prepended, and .XXXXXX appended (for mkstemp() to
  88  *   put its unique gunk in).  Take care to not exceed
  89  *   either the MAXPATHLEN or NAME_MAX, esp. the last, as
  90  *   the basename basically becomes 8 chars longer. In that
  91  *   case, the original name is shortened sufficiently to
  92  *   make it all fit.
  93  *
  94  *   Of course, there's no real reason for the tmp name to
  95  *   look like the original, except to satisfy us humans.
  96  *   As long as it's unique, rsync will work.
  97  */
  98
  99 static int get_tmpname(char *fnametmp, char *fname)
 100 {
 101         char *f;
 102         int     length = 0;
 103         int     maxname;
 104
 105         if (tmpdir) {
 106                 /* Note: this can't overflow, so the return value is safe */
 107                 length = strlcpy(fnametmp, tmpdir, MAXPATHLEN - 2);
 108                 fnametmp[length++] = '/';
 109                 fnametmp[length] = '\0';        /* always NULL terminated */
 110         }
 111
 112         if ((f = strrchr(fname, '/')) != NULL) {
 113                 ++f;
 114                 if (!tmpdir) {
 115                         length = f - fname;
 116                         /* copy up to and including the slash */
 117                         strlcpy(fnametmp, fname, length + 1);
 118                 }
 119         } else
 120                 f = fname;
 121         fnametmp[length++] = '.';
 122         fnametmp[length] = '\0';                /* always NULL terminated */
 123
 124         maxname = MIN(MAXPATHLEN - 7 - length, NAME_MAX - 8);
 125
 126         if (maxname < 1) {
 127                 rprintf(FERROR, "temporary filename too long: %s\n",
 128                         safe_fname(fname));
 129                 fnametmp[0] = '\0';
 130                 return 0;
 131         }
 132
 133         strlcpy(fnametmp + length, f, maxname);
 134         strcat(fnametmp + length, ".XXXXXX");
 135
 136         return 1;
 137 }
 138
 139
 140 static int receive_data(int f_in, char *fname_r, int fd_r, OFF_T size_r,
 141                         char *fname, int fd, OFF_T total_size)
 142 {
 143         static char file_sum1[MD4_SUM_LENGTH];
 144         static char file_sum2[MD4_SUM_LENGTH];
 145         struct map_struct *mapbuf;
 146         struct sum_struct sum;
 147         int32 len;
 148         OFF_T offset = 0;
 149         OFF_T offset2;
 150         char *data;
 151         int32 i;
 152         char *map = NULL;
 153
 154         read_sum_head(f_in, &sum);
 155
 156         if (fd_r >= 0 && size_r > 0) {
 157                 int32 read_size = MAX(sum.blength * 2, 16*1024);
 158                 mapbuf = map_file(fd_r, size_r, read_size, sum.blength);
 159                 if (verbose > 2) {
 160                         rprintf(FINFO, "recv mapped %s of size %.0f\n",
 161                                 safe_fname(fname_r), (double)size_r);
 162                 }
 163         } else
 164                 mapbuf = NULL;
 165
 166         sum_init(checksum_seed);
 167
 168         while ((i = recv_token(f_in, &data)) != 0) {
 169                 if (do_progress)
 170                         show_progress(offset, total_size);
 171
 172                 if (i > 0) {
 173                         if (verbose > 3) {
 174                                 rprintf(FINFO,"data recv %d at %.0f\n",
 175                                         i,(double)offset);
 176                         }
 177
 178                         stats.literal_data += i;
 179                         cleanup_got_literal = 1;
 180
 181                         sum_update(data, i);
 182
 183                         if (fd != -1 && write_file(fd,data,i) != i)
 184                                 goto report_write_error;
 185                         offset += i;
 186                         continue;
 187                 }
 188
 189                 i = -(i+1);
 190                 offset2 = i * (OFF_T)sum.blength;
 191                 len = sum.blength;
 192                 if (i == (int)sum.count-1 && sum.remainder != 0)
 193                         len = sum.remainder;
 194
 195                 stats.matched_data += len;
 196
 197                 if (verbose > 3) {
 198                         rprintf(FINFO,
 199                                 "chunk[%d] of size %ld at %.0f offset=%.0f\n",
 200                                 i, (long)len, (double)offset2, (double)offset);
 201                 }
 202
 203                 if (mapbuf) {
 204                         map = map_ptr(mapbuf,offset2,len);
 205
 206                         see_token(map, len);
 207                         sum_update(map, len);
 208                 }
 209
 210                 if (inplace) {
 211                         if (offset == offset2 && fd != -1) {
 212                                 if (flush_write_file(fd) < 0)
 213                                         goto report_write_error;
 214                                 offset += len;
 215                                 if (do_lseek(fd, len, SEEK_CUR) != offset) {
 216                                         rsyserr(FERROR, errno,
 217                                                 "lseek failed on %s",
 218                                                 full_fname(fname));
 219                                         exit_cleanup(RERR_FILEIO);
 220                                 }
 221                                 continue;
 222                         }
 223                 }
 224                 if (fd != -1 && write_file(fd, map, len) != (int)len)
 225                         goto report_write_error;
 226                 offset += len;
 227         }
 228
 229         if (flush_write_file(fd) < 0)
 230                 goto report_write_error;
 231
 232 #ifdef HAVE_FTRUNCATE
 233         if (inplace && fd != -1)
 234                 ftruncate(fd, offset);
 235 #endif
 236
 237         if (do_progress)
 238                 end_progress(total_size);
 239
 240         if (fd != -1 && offset > 0 && sparse_end(fd) != 0) {
 241             report_write_error:
 242                 rsyserr(FERROR, errno, "write failed on %s",
 243                         full_fname(fname));
 244                 exit_cleanup(RERR_FILEIO);
 245         }
 246
 247         sum_end(file_sum1);
 248
 249         if (mapbuf)
 250                 unmap_file(mapbuf);
 251
 252         read_buf(f_in,file_sum2,MD4_SUM_LENGTH);
 253         if (verbose > 2)
 254                 rprintf(FINFO,"got file_sum\n");
 255         if (fd != -1 && memcmp(file_sum1, file_sum2, MD4_SUM_LENGTH) != 0)
 256                 return 0;
 257         return 1;
 258 }
 259
 260
 261 static void read_gen_name(int fd, char *dirname, char *buf)
 262 {
 263         int dlen;
 264         int len = read_byte(fd);
 265
 266         if (len & 0x80) {
 267 #if MAXPATHLEN > 32767
 268                 uchar lenbuf[2];
 269                 read_buf(fd, (char *)lenbuf, 2);
 270                 len = (len & ~0x80) * 0x10000 + lenbuf[0] * 0x100 + lenbuf[1];
 271 #else
 272                 len = (len & ~0x80) * 0x100 + read_byte(fd);
 273 #endif
 274         }
 275
 276         if (dirname) {
 277                 dlen = strlcpy(buf, dirname, MAXPATHLEN);
 278                 buf[dlen++] = '/';
 279         } else
 280                 dlen = 0;
 281
 282         if (dlen + len >= MAXPATHLEN) {
 283                 rprintf(FERROR, "bogus data on generator name pipe\n");
 284                 exit_cleanup(RERR_PROTOCOL);
 285         }
 286
 287         read_sbuf(fd, buf + dlen, len);
 288 }
 289
 290
 291 static void discard_receive_data(int f_in, OFF_T length)
 292 {
 293         receive_data(f_in, NULL, -1, 0, NULL, -1, length);
 294 }
 295
 296
 297 /**
 298  * main routine for receiver process.
 299  *
 300  * Receiver process runs on the same host as the generator process. */
 301 int recv_files(int f_in, struct file_list *flist, char *local_name,
 302                int f_in_name)
 303 {
 304         int next_gen_i = -1;
 305         int fd1,fd2;
 306         STRUCT_STAT st;
 307         char *fname, fbuf[MAXPATHLEN];
 308         char template[MAXPATHLEN];
 309         char fnametmp[MAXPATHLEN];
 310         char *fnamecmp, *partialptr;
 311         char fnamecmpbuf[MAXPATHLEN];
 312         uchar *delayed_bits = NULL;
 313         struct file_struct *file;
 314         struct stats initial_stats;
 315         int save_make_backups = make_backups;
 316         int i, recv_ok, phase = 0;
 317
 318         if (verbose > 2)
 319                 rprintf(FINFO,"recv_files(%d) starting\n",flist->count);
 320
 321         if (flist->hlink_pool) {
 322                 pool_destroy(flist->hlink_pool);
 323                 flist->hlink_pool = NULL;
 324         }
 325
 326         if (delay_updates) {
 327                 int sz = (flist->count + 7) / 8;
 328                 if (!(delayed_bits = new_array(uchar, sz)))
 329                         out_of_memory("recv_files");
 330                 memset(delayed_bits, 0, sz);
 331         }
 332
 333         while (1) {
 334                 cleanup_disable();
 335
 336                 i = read_int(f_in);
 337                 if (i == -1) {
 338                         if (read_batch) {
 339                                 if (next_gen_i != flist->count) {
 340                                         do {
 341                                                 if (f_in_name >= 0
 342                                                     && next_gen_i >= 0)
 343                                                         read_byte(f_in_name);
 344                                         } while (read_int(batch_gen_fd) != -1);
 345                                 }
 346                                 next_gen_i = -1;
 347                         }
 348
 349                         if (phase)
 350                                 break;
 351
 352                         phase = 1;
 353                         csum_length = SUM_LENGTH;
 354                         if (verbose > 2)
 355                                 rprintf(FINFO, "recv_files phase=%d\n", phase);
 356                         send_msg(MSG_DONE, "", 0);
 357                         if (keep_partial && !partial_dir)
 358                                 make_backups = 0; /* prevents double backup */
 359                         continue;
 360                 }
 361
 362                 if (i < 0 || i >= flist->count) {
 363                         rprintf(FERROR,"Invalid file index %d in recv_files (count=%d)\n",
 364                                 i, flist->count);
 365                         exit_cleanup(RERR_PROTOCOL);
 366                 }
 367
 368                 file = flist->files[i];
 369                 if (S_ISDIR(file->mode)) {
 370                         rprintf(FERROR, "[%s] got index of directory: %d\n",
 371                                 who_am_i(), i);
 372                         exit_cleanup(RERR_PROTOCOL);
 373                 }
 374
 375                 stats.current_file_index = i;
 376                 stats.num_transferred_files++;
 377                 stats.total_transferred_size += file->length;
 378                 cleanup_got_literal = 0;
 379
 380                 fname = local_name ? local_name : f_name_to(file, fbuf);
 381
 382                 if (server_filter_list.head
 383                     && check_filter(&server_filter_list, fname, 0) < 0) {
 384                         rprintf(FERROR, "attempt to hack rsync failed.\n");
 385                         exit_cleanup(RERR_PROTOCOL);
 386                 }
 387
 388                 if (verbose > 2)
 389                         rprintf(FINFO, "recv_files(%s)\n", safe_fname(fname));
 390
 391                 if (dry_run) { /* log the transfer */
 392                         if (!am_server && verbose && !what_has_changed)
 393                                 rprintf(FINFO, "%s\n", safe_fname(fname));
 394                         continue;
 395                 }
 396
 397                 initial_stats = stats;
 398
 399                 if (read_batch) {
 400                         while (i > next_gen_i) {
 401                                 if (f_in_name >= 0 && next_gen_i >= 0)
 402                                         read_byte(f_in_name);
 403                                 next_gen_i = read_int(batch_gen_fd);
 404                                 if (next_gen_i == -1)
 405                                         next_gen_i = flist->count;
 406                         }
 407                         if (i < next_gen_i) {
 408                                 rprintf(FINFO, "skipping update for \"%s\"\n",
 409                                         safe_fname(fname));
 410                                 discard_receive_data(f_in, file->length);
 411                                 continue;
 412                         }
 413                         next_gen_i = -1;
 414                 }
 415
 416                 partialptr = partial_dir ? partial_dir_fname(fname) : fname;
 417
 418                 if (f_in_name >= 0) {
 419                         uchar j;
 420                         switch (j = read_byte(f_in_name)) {
 421                         case FNAMECMP_FNAME:
 422                                 fnamecmp = fname;
 423                                 break;
 424                         case FNAMECMP_PARTIAL_DIR:
 425                                 fnamecmp = partialptr ? partialptr : fname;
 426                                 break;
 427                         case FNAMECMP_BACKUP:
 428                                 fnamecmp = get_backup_name(fname);
 429                                 break;
 430                         case FNAMECMP_FUZZY:
 431                                 read_gen_name(f_in_name, file->dirname, fnamecmpbuf);
 432                                 fnamecmp = fnamecmpbuf;
 433                                 break;
 434                         default:
 435                                 if (j >= basis_dir_cnt) {
 436                                         rprintf(FERROR,
 437                                                 "invalid basis_dir index: %d.\n",
 438                                                 j);
 439                                         exit_cleanup(RERR_PROTOCOL);
 440                                 }
 441                                 pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 442                                          basis_dir[j], fname);
 443                                 fnamecmp = fnamecmpbuf;
 444                                 break;
 445                         }
 446                 } else
 447                         fnamecmp = fname;
 448
 449                 /* open the file */
 450                 fd1 = do_open(fnamecmp, O_RDONLY, 0);
 451
 452                 if (fd1 != -1 && do_fstat(fd1,&st) != 0) {
 453                         rsyserr(FERROR, errno, "fstat %s failed",
 454                                 full_fname(fnamecmp));
 455                         discard_receive_data(f_in, file->length);
 456                         close(fd1);
 457                         continue;
 458                 }
 459
 460                 if (fd1 != -1 && S_ISDIR(st.st_mode) && fnamecmp == fname) {
 461                         /* this special handling for directories
 462                          * wouldn't be necessary if robust_rename()
 463                          * and the underlying robust_unlink could cope
 464                          * with directories
 465                          */
 466                         rprintf(FERROR,"recv_files: %s is a directory\n",
 467                                 full_fname(fnamecmp));
 468                         discard_receive_data(f_in, file->length);
 469                         close(fd1);
 470                         continue;
 471                 }
 472
 473                 if (fd1 != -1 && !S_ISREG(st.st_mode)) {
 474                         close(fd1);
 475                         fd1 = -1;
 476                 }
 477
 478                 if (fd1 != -1 && !preserve_perms) {
 479                         /* if the file exists already and we aren't preserving
 480                          * permissions then act as though the remote end sent
 481                          * us the file permissions we already have */
 482                         file->mode = st.st_mode;
 483                 }
 484
 485                 /* We now check to see if we are writing file "inplace" */
 486                 if (inplace)  {
 487                         fd2 = do_open(fname, O_WRONLY|O_CREAT, 0);
 488                         if (fd2 == -1) {
 489                                 rsyserr(FERROR, errno, "open %s failed",
 490                                         full_fname(fname));
 491                                 discard_receive_data(f_in, file->length);
 492                                 if (fd1 != -1)
 493                                         close(fd1);
 494                                 continue;
 495                         }
 496                 } else {
 497                         if (!get_tmpname(fnametmp,fname)) {
 498                                 discard_receive_data(f_in, file->length);
 499                                 if (fd1 != -1)
 500                                         close(fd1);
 501                                 continue;
 502                         }
 503
 504                         strlcpy(template, fnametmp, sizeof template);
 505
 506                         /* we initially set the perms without the
 507                          * setuid/setgid bits to ensure that there is no race
 508                          * condition. They are then correctly updated after
 509                          * the lchown. Thanks to snabb@epipe.fi for pointing
 510                          * this out.  We also set it initially without group
 511                          * access because of a similar race condition. */
 512                         fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 513
 514                         /* in most cases parent directories will already exist
 515                          * because their information should have been previously
 516                          * transferred, but that may not be the case with -R */
 517                         if (fd2 == -1 && relative_paths && errno == ENOENT
 518                             && create_directory_path(fnametmp, orig_umask) == 0) {
 519                                 strlcpy(fnametmp, template, sizeof fnametmp);
 520                                 fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 521                         }
 522                         if (fd2 == -1) {
 523                                 rsyserr(FERROR, errno, "mkstemp %s failed",
 524                                         full_fname(fnametmp));
 525                                 discard_receive_data(f_in, file->length);
 526                                 if (fd1 != -1)
 527                                         close(fd1);
 528                                 continue;
 529                         }
 530
 531                         if (partialptr)
 532                                 cleanup_set(fnametmp, partialptr, file, fd1, fd2);
 533                 }
 534
 535                 /* log the transfer */
 536                 if (!am_server && verbose && !what_has_changed)
 537                         rprintf(FINFO, "%s\n", safe_fname(fname));
 538
 539                 /* recv file data */
 540                 recv_ok = receive_data(f_in, fnamecmp, fd1, st.st_size,
 541                                        fname, fd2, file->length);
 542
 543                 log_recv(file, &initial_stats);
 544
 545                 if (fd1 != -1)
 546                         close(fd1);
 547                 if (close(fd2) < 0) {
 548                         rsyserr(FERROR, errno, "close failed on %s",
 549                                 full_fname(fnametmp));
 550                         exit_cleanup(RERR_FILEIO);
 551                 }
 552
 553                 if ((recv_ok && (!delay_updates || !partialptr)) || inplace) {
 554                         finish_transfer(fname, fnametmp, file, recv_ok, 1);
 555                         if (partialptr != fname && fnamecmp == partialptr) {
 556                                 do_unlink(partialptr);
 557                                 handle_partial_dir(partialptr, PDIR_DELETE);
 558                         }
 559                 } else if (keep_partial && partialptr
 560                     && handle_partial_dir(partialptr, PDIR_CREATE)) {
 561                         finish_transfer(partialptr, fnametmp, file, recv_ok,
 562                                         !partial_dir);
 563                         if (delay_updates && recv_ok)
 564                                 delayed_bits[i/8] |= 1 << (i % 8);
 565                 } else {
 566                         partialptr = NULL;
 567                         do_unlink(fnametmp);
 568                 }
 569
 570                 cleanup_disable();
 571
 572                 if (!recv_ok) {
 573                         int msgtype = csum_length == SUM_LENGTH || read_batch ?
 574                                 FERROR : FINFO;
 575                         if (msgtype == FERROR || verbose) {
 576                                 char *errstr, *redostr, *keptstr;
 577                                 if (!(keep_partial && partialptr) && !inplace)
 578                                         keptstr = "discarded";
 579                                 else if (partial_dir)
 580                                         keptstr = "put into partial-dir";
 581                                 else
 582                                         keptstr = "retained";
 583                                 if (msgtype == FERROR) {
 584                                         errstr = "ERROR";
 585                                         redostr = "";
 586                                 } else {
 587                                         errstr = "WARNING";
 588                                         redostr = " (will try again)";
 589                                 }
 590                                 rprintf(msgtype,
 591                                         "%s: %s failed verification -- update %s%s.\n",
 592                                         errstr, safe_fname(fname),
 593                                         keptstr, redostr);
 594                         }
 595                         if (csum_length != SUM_LENGTH) {
 596                                 char buf[4];
 597                                 SIVAL(buf, 0, i);
 598                                 send_msg(MSG_REDO, buf, 4);
 599                         }
 600                 }
 601         }
 602         make_backups = save_make_backups;
 603
 604         if (delay_updates) {
 605                 for (i = 0; i < flist->count; i++) {
 606                         struct file_struct *file = flist->files[i];
 607                         if (!file->basename
 608                          || !(delayed_bits[i/8] & (1 << (i % 8))))
 609                                 continue;
 610                         fname = local_name ? local_name : f_name(file);
 611                         partialptr = partial_dir_fname(fname);
 612                         if (partialptr) {
 613                                 if (make_backups && !make_backup(fname))
 614                                         continue;
 615                                 if (verbose > 2) {
 616                                         rprintf(FINFO, "renaming %s to %s\n",
 617                                                 safe_fname(partialptr),
 618                                                 safe_fname(fname));
 619                                 }
 620                                 if (do_rename(partialptr, fname) < 0) {
 621                                         rsyserr(FERROR, errno,
 622                                                 "rename failed for %s (from %s)",
 623                                                 full_fname(fname),
 624                                                 safe_fname(partialptr));
 625                                 } else {
 626                                         handle_partial_dir(partialptr,
 627                                                            PDIR_DELETE);
 628                                 }
 629                         }
 630                 }
 631         }
 632
 633         if (delete_after && !local_name && flist->count > 0)
 634                 delete_files(flist);
 635
 636         if (verbose > 2)
 637                 rprintf(FINFO,"recv_files finished\n");
 638
 639         return 0;
 640 }