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