receiver.c

   1 /* -*- c-file-style: "linux" -*-
   2
   3    Copyright (C) 1996-2000 by Andrew Tridgell
   4    Copyright (C) Paul Mackerras 1996
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 #include "rsync.h"
  22
  23 extern int verbose;
  24 extern int recurse;
  25 extern int delete_after;
  26 extern int max_delete;
  27 extern int csum_length;
  28 extern struct stats stats;
  29 extern int dry_run;
  30 extern int read_batch;
  31 extern int batch_gen_fd;
  32 extern int am_server;
  33 extern int protocol_version;
  34 extern int relative_paths;
  35 extern int keep_dirlinks;
  36 extern int preserve_hard_links;
  37 extern int preserve_perms;
  38 extern int cvs_exclude;
  39 extern int io_error;
  40 extern char *tmpdir;
  41 extern char *partial_dir;
  42 extern char *basis_dir[];
  43 extern int basis_dir_cnt;
  44 extern int make_backups;
  45 extern int do_progress;
  46 extern char *backup_dir;
  47 extern char *backup_suffix;
  48 extern int backup_suffix_len;
  49 extern int cleanup_got_literal;
  50 extern int module_id;
  51 extern int ignore_errors;
  52 extern int orig_umask;
  53 extern int keep_partial;
  54 extern int checksum_seed;
  55 extern int inplace;
  56
  57 extern struct exclude_list_struct server_exclude_list;
  58
  59
  60 static void delete_one(char *fn, int is_dir)
  61 {
  62         if (!is_dir) {
  63                 if (robust_unlink(fn) != 0) {
  64                         rsyserr(FERROR, errno, "delete_one: unlink %s failed",
  65                                 full_fname(fn));
  66                 } else if (verbose)
  67                         rprintf(FINFO, "deleting %s\n", safe_fname(fn));
  68         } else {
  69                 if (do_rmdir(fn) != 0) {
  70                         if (errno != ENOTEMPTY && errno != EEXIST) {
  71                                 rsyserr(FERROR, errno,
  72                                         "delete_one: rmdir %s failed",
  73                                         full_fname(fn));
  74                         }
  75                 } else if (verbose) {
  76                         rprintf(FINFO, "deleting directory %s\n",
  77                                 safe_fname(fn));
  78                 }
  79         }
  80 }
  81
  82
  83 static int is_backup_file(char *fn)
  84 {
  85         int k = strlen(fn) - backup_suffix_len;
  86         return k > 0 && strcmp(fn+k, backup_suffix) == 0;
  87 }
  88
  89
  90 /* This deletes any files on the receiving side that are not present
  91  * on the sending side. */
  92 void delete_files(struct file_list *flist)
  93 {
  94         struct file_list *local_file_list;
  95         int i, j;
  96         char *argv[1], fbuf[MAXPATHLEN];
  97         static int deletion_count;
  98
  99         if (cvs_exclude)
 100                 add_cvs_excludes();
 101
 102         if (io_error && !(lp_ignore_errors(module_id) || ignore_errors)) {
 103                 rprintf(FINFO,"IO error encountered - skipping file deletion\n");
 104                 return;
 105         }
 106
 107         for (j = 0; j < flist->count; j++) {
 108                 if (!(flist->files[j]->flags & FLAG_TOP_DIR)
 109                     || !S_ISDIR(flist->files[j]->mode))
 110                         continue;
 111
 112                 argv[0] = f_name_to(flist->files[j], fbuf);
 113
 114                 if (!(local_file_list = send_file_list(-1, 1, argv)))
 115                         continue;
 116
 117                 if (verbose > 1)
 118                         rprintf(FINFO, "deleting in %s\n", safe_fname(fbuf));
 119
 120                 for (i = local_file_list->count-1; i >= 0; i--) {
 121                         if (max_delete && deletion_count >= max_delete)
 122                                 break;
 123                         if (!local_file_list->files[i]->basename)
 124                                 continue;
 125                         if (flist_find(flist,local_file_list->files[i]) < 0) {
 126                                 char *f = f_name(local_file_list->files[i]);
 127                                 int mode = local_file_list->files[i]->mode;
 128                                 if (make_backups && (backup_dir || !is_backup_file(f))
 129                                   && !S_ISDIR(mode)) {
 130                                         make_backup(f);
 131                                         if (verbose) {
 132                                                 rprintf(FINFO, "deleting %s\n",
 133                                                         safe_fname(f));
 134                                         }
 135                                 } else
 136                                         delete_one(f, S_ISDIR(mode) != 0);
 137                                 deletion_count++;
 138                         }
 139                 }
 140                 flist_free(local_file_list);
 141         }
 142 }
 143
 144
 145 /*
 146  * get_tmpname() - create a tmp filename for a given filename
 147  *
 148  *   If a tmpdir is defined, use that as the directory to
 149  *   put it in.  Otherwise, the tmp filename is in the same
 150  *   directory as the given name.  Note that there may be no
 151  *   directory at all in the given name!
 152  *
 153  *   The tmp filename is basically the given filename with a
 154  *   dot prepended, and .XXXXXX appended (for mkstemp() to
 155  *   put its unique gunk in).  Take care to not exceed
 156  *   either the MAXPATHLEN or NAME_MAX, esp. the last, as
 157  *   the basename basically becomes 8 chars longer. In that
 158  *   case, the original name is shortened sufficiently to
 159  *   make it all fit.
 160  *
 161  *   Of course, there's no real reason for the tmp name to
 162  *   look like the original, except to satisfy us humans.
 163  *   As long as it's unique, rsync will work.
 164  */
 165
 166 static int get_tmpname(char *fnametmp, char *fname)
 167 {
 168         char *f;
 169         int     length = 0;
 170         int     maxname;
 171
 172         if (tmpdir) {
 173                 /* Note: this can't overflow, so the return value is safe */
 174                 length = strlcpy(fnametmp, tmpdir, MAXPATHLEN - 2);
 175                 fnametmp[length++] = '/';
 176                 fnametmp[length] = '\0';        /* always NULL terminated */
 177         }
 178
 179         if ((f = strrchr(fname, '/')) != NULL) {
 180                 ++f;
 181                 if (!tmpdir) {
 182                         length = f - fname;
 183                         /* copy up to and including the slash */
 184                         strlcpy(fnametmp, fname, length + 1);
 185                 }
 186         } else
 187                 f = fname;
 188         fnametmp[length++] = '.';
 189         fnametmp[length] = '\0';                /* always NULL terminated */
 190
 191         maxname = MIN(MAXPATHLEN - 7 - length, NAME_MAX - 8);
 192
 193         if (maxname < 1) {
 194                 rprintf(FERROR, "temporary filename too long: %s\n", fname);
 195                 fnametmp[0] = '\0';
 196                 return 0;
 197         }
 198
 199         strlcpy(fnametmp + length, f, maxname);
 200         strcat(fnametmp + length, ".XXXXXX");
 201
 202         return 1;
 203 }
 204
 205
 206 static int receive_data(int f_in, char *fname_r, int fd_r, OFF_T size_r,
 207                         char *fname, int fd, OFF_T total_size)
 208 {
 209         static char file_sum1[MD4_SUM_LENGTH];
 210         static char file_sum2[MD4_SUM_LENGTH];
 211         struct map_struct *mapbuf;
 212         struct sum_struct sum;
 213         int32 len;
 214         OFF_T offset = 0;
 215         OFF_T offset2;
 216         char *data;
 217         int32 i;
 218         char *map = NULL;
 219
 220         read_sum_head(f_in, &sum);
 221
 222         if (fd_r >= 0 && size_r > 0) {
 223                 int32 read_size = MAX(sum.blength * 2, 16*1024);
 224                 mapbuf = map_file(fd_r, size_r, read_size, sum.blength);
 225                 if (verbose > 2) {
 226                         rprintf(FINFO, "recv mapped %s of size %.0f\n",
 227                                 safe_fname(fname_r), (double)size_r);
 228                 }
 229         } else
 230                 mapbuf = NULL;
 231
 232         sum_init(checksum_seed);
 233
 234         while ((i = recv_token(f_in, &data)) != 0) {
 235                 if (do_progress)
 236                         show_progress(offset, total_size);
 237
 238                 if (i > 0) {
 239                         if (verbose > 3) {
 240                                 rprintf(FINFO,"data recv %d at %.0f\n",
 241                                         i,(double)offset);
 242                         }
 243
 244                         stats.literal_data += i;
 245                         cleanup_got_literal = 1;
 246
 247                         sum_update(data, i);
 248
 249                         if (fd != -1 && write_file(fd,data,i) != i)
 250                                 goto report_write_error;
 251                         offset += i;
 252                         continue;
 253                 }
 254
 255                 i = -(i+1);
 256                 offset2 = i * (OFF_T)sum.blength;
 257                 len = sum.blength;
 258                 if (i == (int)sum.count-1 && sum.remainder != 0)
 259                         len = sum.remainder;
 260
 261                 stats.matched_data += len;
 262
 263                 if (verbose > 3) {
 264                         rprintf(FINFO,
 265                                 "chunk[%d] of size %ld at %.0f offset=%.0f\n",
 266                                 i, (long)len, (double)offset2, (double)offset);
 267                 }
 268
 269                 if (mapbuf) {
 270                         map = map_ptr(mapbuf,offset2,len);
 271
 272                         see_token(map, len);
 273                         sum_update(map, len);
 274                 }
 275
 276                 if (inplace) {
 277                         if (offset == offset2 && fd != -1) {
 278                                 if (flush_write_file(fd) < 0)
 279                                         goto report_write_error;
 280                                 offset += len;
 281                                 if (do_lseek(fd, len, SEEK_CUR) != offset) {
 282                                         rsyserr(FERROR, errno,
 283                                                 "lseek failed on %s",
 284                                                 full_fname(fname));
 285                                         exit_cleanup(RERR_FILEIO);
 286                                 }
 287                                 continue;
 288                         }
 289                 }
 290                 if (fd != -1 && write_file(fd, map, len) != (int)len)
 291                         goto report_write_error;
 292                 offset += len;
 293         }
 294
 295         if (flush_write_file(fd) < 0)
 296                 goto report_write_error;
 297
 298 #ifdef HAVE_FTRUNCATE
 299         if (inplace && fd != -1)
 300                 ftruncate(fd, offset);
 301 #endif
 302
 303         if (do_progress)
 304                 end_progress(total_size);
 305
 306         if (fd != -1 && offset > 0 && sparse_end(fd) != 0) {
 307             report_write_error:
 308                 rsyserr(FERROR, errno, "write failed on %s",
 309                         full_fname(fname));
 310                 exit_cleanup(RERR_FILEIO);
 311         }
 312
 313         sum_end(file_sum1);
 314
 315         if (mapbuf)
 316                 unmap_file(mapbuf);
 317
 318         read_buf(f_in,file_sum2,MD4_SUM_LENGTH);
 319         if (verbose > 2)
 320                 rprintf(FINFO,"got file_sum\n");
 321         if (fd != -1 && memcmp(file_sum1, file_sum2, MD4_SUM_LENGTH) != 0)
 322                 return 0;
 323         return 1;
 324 }
 325
 326
 327 static void discard_receive_data(int f_in, OFF_T length)
 328 {
 329         receive_data(f_in, NULL, -1, 0, NULL, -1, length);
 330 }
 331
 332
 333 /**
 334  * main routine for receiver process.
 335  *
 336  * Receiver process runs on the same host as the generator process. */
 337 int recv_files(int f_in, struct file_list *flist, char *local_name,
 338                int f_in_name)
 339 {
 340         int next_gen_i = -1;
 341         int fd1,fd2;
 342         STRUCT_STAT st;
 343         char *fname, fbuf[MAXPATHLEN];
 344         char template[MAXPATHLEN];
 345         char fnametmp[MAXPATHLEN];
 346         char *fnamecmp, *partialptr;
 347         char fnamecmpbuf[MAXPATHLEN];
 348         struct file_struct *file;
 349         struct stats initial_stats;
 350         int save_make_backups = make_backups;
 351         int i, recv_ok, phase = 0;
 352
 353         if (verbose > 2)
 354                 rprintf(FINFO,"recv_files(%d) starting\n",flist->count);
 355
 356         if (flist->hlink_pool) {
 357                 pool_destroy(flist->hlink_pool);
 358                 flist->hlink_pool = NULL;
 359         }
 360
 361         while (1) {
 362                 cleanup_disable();
 363
 364                 i = read_int(f_in);
 365                 if (i == -1) {
 366                         if (read_batch) {
 367                                 if (next_gen_i != flist->count) {
 368                                         do {
 369                                                 if (f_in_name >= 0
 370                                                     && next_gen_i >= 0)
 371                                                         read_byte(f_in_name);
 372                                         } while (read_int(batch_gen_fd) != -1);
 373                                 }
 374                                 next_gen_i = -1;
 375                         }
 376
 377                         if (phase)
 378                                 break;
 379
 380                         phase = 1;
 381                         csum_length = SUM_LENGTH;
 382                         if (verbose > 2)
 383                                 rprintf(FINFO, "recv_files phase=%d\n", phase);
 384                         send_msg(MSG_DONE, "", 0);
 385                         if (keep_partial && !partial_dir)
 386                                 make_backups = 0; /* prevents double backup */
 387                         continue;
 388                 }
 389
 390                 if (i < 0 || i >= flist->count) {
 391                         rprintf(FERROR,"Invalid file index %d in recv_files (count=%d)\n",
 392                                 i, flist->count);
 393                         exit_cleanup(RERR_PROTOCOL);
 394                 }
 395
 396                 file = flist->files[i];
 397
 398                 stats.current_file_index = i;
 399                 stats.num_transferred_files++;
 400                 stats.total_transferred_size += file->length;
 401                 cleanup_got_literal = 0;
 402
 403                 if (local_name)
 404                         fname = local_name;
 405                 else
 406                         fname = f_name_to(file, fbuf);
 407
 408                 if (dry_run) {
 409                         if (!am_server && verbose) /* log the transfer */
 410                                 rprintf(FINFO, "%s\n", safe_fname(fname));
 411                         continue;
 412                 }
 413
 414                 initial_stats = stats;
 415
 416                 if (verbose > 2)
 417                         rprintf(FINFO, "recv_files(%s)\n", safe_fname(fname));
 418
 419                 if (read_batch) {
 420                         while (i > next_gen_i) {
 421                                 if (f_in_name >= 0 && next_gen_i >= 0)
 422                                         read_byte(f_in_name);
 423                                 next_gen_i = read_int(batch_gen_fd);
 424                                 if (next_gen_i == -1)
 425                                         next_gen_i = flist->count;
 426                         }
 427                         if (i < next_gen_i) {
 428                                 rprintf(FINFO, "skipping update for \"%s\"\n",
 429                                         safe_fname(fname));
 430                                 discard_receive_data(f_in, file->length);
 431                                 continue;
 432                         }
 433                         next_gen_i = -1;
 434                 }
 435
 436                 if (server_exclude_list.head
 437                     && check_exclude(&server_exclude_list, fname,
 438                                      S_ISDIR(file->mode)) < 0) {
 439                         rprintf(FERROR, "attempt to hack rsync failed.\n");
 440                         exit_cleanup(RERR_PROTOCOL);
 441                 }
 442
 443                 partialptr = partial_dir ? partial_dir_fname(fname) : fname;
 444
 445                 if (f_in_name >= 0) {
 446                         uchar j;
 447                         switch (j = read_byte(f_in_name)) {
 448                         case FNAMECMP_FNAME:
 449                                 fnamecmp = fname;
 450                                 break;
 451                         case FNAMECMP_PARTIAL_DIR:
 452                                 fnamecmp = partialptr ? partialptr : fname;
 453                                 break;
 454                         case FNAMECMP_BACKUP:
 455                                 fnamecmp = get_backup_name(fname);
 456                                 break;
 457                         default:
 458                                 if (j >= basis_dir_cnt) {
 459                                         rprintf(FERROR,
 460                                                 "invalid basis_dir index: %d.\n",
 461                                                 j);
 462                                         exit_cleanup(RERR_PROTOCOL);
 463                                 }
 464                                 pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 465                                          basis_dir[j], fname);
 466                                 fnamecmp = fnamecmpbuf;
 467                                 break;
 468                         }
 469                 } else
 470                         fnamecmp = fname;
 471
 472                 /* open the file */
 473                 fd1 = do_open(fnamecmp, O_RDONLY, 0);
 474
 475                 if (fd1 != -1 && do_fstat(fd1,&st) != 0) {
 476                         rsyserr(FERROR, errno, "fstat %s failed",
 477                                 full_fname(fnamecmp));
 478                         discard_receive_data(f_in, file->length);
 479                         close(fd1);
 480                         continue;
 481                 }
 482
 483                 if (fd1 != -1 && S_ISDIR(st.st_mode) && fnamecmp == fname) {
 484                         /* this special handling for directories
 485                          * wouldn't be necessary if robust_rename()
 486                          * and the underlying robust_unlink could cope
 487                          * with directories
 488                          */
 489                         rprintf(FERROR,"recv_files: %s is a directory\n",
 490                                 full_fname(fnamecmp));
 491                         discard_receive_data(f_in, file->length);
 492                         close(fd1);
 493                         continue;
 494                 }
 495
 496                 if (fd1 != -1 && !S_ISREG(st.st_mode)) {
 497                         close(fd1);
 498                         fd1 = -1;
 499                 }
 500
 501                 if (fd1 != -1 && !preserve_perms) {
 502                         /* if the file exists already and we aren't preserving
 503                          * permissions then act as though the remote end sent
 504                          * us the file permissions we already have */
 505                         file->mode = st.st_mode;
 506                 }
 507
 508                 /* We now check to see if we are writing file "inplace" */
 509                 if (inplace)  {
 510                         fd2 = do_open(fname, O_WRONLY|O_CREAT, 0);
 511                         if (fd2 == -1) {
 512                                 rsyserr(FERROR, errno, "open %s failed",
 513                                         full_fname(fname));
 514                                 discard_receive_data(f_in, file->length);
 515                                 if (fd1 != -1)
 516                                         close(fd1);
 517                                 continue;
 518                         }
 519                 } else {
 520                         if (!get_tmpname(fnametmp,fname)) {
 521                                 discard_receive_data(f_in, file->length);
 522                                 if (fd1 != -1)
 523                                         close(fd1);
 524                                 continue;
 525                         }
 526
 527                         strlcpy(template, fnametmp, sizeof template);
 528
 529                         /* we initially set the perms without the
 530                          * setuid/setgid bits to ensure that there is no race
 531                          * condition. They are then correctly updated after
 532                          * the lchown. Thanks to snabb@epipe.fi for pointing
 533                          * this out.  We also set it initially without group
 534                          * access because of a similar race condition. */
 535                         fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 536
 537                         /* in most cases parent directories will already exist
 538                          * because their information should have been previously
 539                          * transferred, but that may not be the case with -R */
 540                         if (fd2 == -1 && relative_paths && errno == ENOENT
 541                             && create_directory_path(fnametmp, orig_umask) == 0) {
 542                                 strlcpy(fnametmp, template, sizeof fnametmp);
 543                                 fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 544                         }
 545                         if (fd2 == -1) {
 546                                 rsyserr(FERROR, errno, "mkstemp %s failed",
 547                                         full_fname(fnametmp));
 548                                 discard_receive_data(f_in, file->length);
 549                                 if (fd1 != -1)
 550                                         close(fd1);
 551                                 continue;
 552                         }
 553
 554                         if (partialptr)
 555                                 cleanup_set(fnametmp, partialptr, file, fd1, fd2);
 556                 }
 557
 558                 if (!am_server && verbose) /* log the transfer */
 559                         rprintf(FINFO, "%s\n", safe_fname(fname));
 560
 561                 /* recv file data */
 562                 recv_ok = receive_data(f_in, fnamecmp, fd1, st.st_size,
 563                                        fname, fd2, file->length);
 564
 565                 log_recv(file, &initial_stats);
 566
 567                 if (fd1 != -1)
 568                         close(fd1);
 569                 if (close(fd2) < 0) {
 570                         rsyserr(FERROR, errno, "close failed on %s",
 571                                 full_fname(fnametmp));
 572                         exit_cleanup(RERR_FILEIO);
 573                 }
 574
 575                 if (recv_ok || inplace) {
 576                         finish_transfer(fname, fnametmp, file, recv_ok, 1);
 577                         if (partialptr != fname && fnamecmp == partialptr) {
 578                                 do_unlink(partialptr);
 579                                 handle_partial_dir(partialptr, PDIR_DELETE);
 580                         }
 581                 } else if (keep_partial && partialptr
 582                     && handle_partial_dir(partialptr, PDIR_CREATE)) {
 583                         finish_transfer(partialptr, fnametmp, file, recv_ok,
 584                                         !partial_dir);
 585                 } else {
 586                         partialptr = NULL;
 587                         do_unlink(fnametmp);
 588                 }
 589
 590                 cleanup_disable();
 591
 592                 if (!recv_ok) {
 593                         int msgtype = csum_length == SUM_LENGTH || read_batch ?
 594                                 FERROR : FINFO;
 595                         if (msgtype == FERROR || verbose) {
 596                                 char *errstr, *redostr, *keptstr;
 597                                 if (!(keep_partial && partialptr) && !inplace)
 598                                         keptstr = "discarded";
 599                                 else if (partial_dir)
 600                                         keptstr = "put into partial-dir";
 601                                 else
 602                                         keptstr = "retained";
 603                                 if (msgtype == FERROR) {
 604                                         errstr = "ERROR";
 605                                         redostr = "";
 606                                 } else {
 607                                         errstr = "WARNING";
 608                                         redostr = " (will try again)";
 609                                 }
 610                                 rprintf(msgtype,
 611                                         "%s: %s failed verification -- update %s%s.\n",
 612                                         errstr, safe_fname(fname),
 613                                         keptstr, redostr);
 614                         }
 615                         if (csum_length != SUM_LENGTH) {
 616                                 char buf[4];
 617                                 SIVAL(buf, 0, i);
 618                                 send_msg(MSG_REDO, buf, 4);
 619                         }
 620                 }
 621         }
 622         make_backups = save_make_backups;
 623
 624         if (delete_after && recurse && !local_name && flist->count > 0)
 625                 delete_files(flist);
 626
 627         if (verbose > 2)
 628                 rprintf(FINFO,"recv_files finished\n");
 629
 630         return 0;
 631 }