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", safe_fname(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",
  79                                 safe_fname(fn));
  80                 }
  81         }
  82 }
  83
  84
  85 static int is_backup_file(char *fn)
  86 {
  87         int k = strlen(fn) - backup_suffix_len;
  88         return k > 0 && strcmp(fn+k, backup_suffix) == 0;
  89 }
  90
  91
  92 /* This deletes any files on the receiving side that are not present
  93  * on the sending side. */
  94 void delete_files(struct file_list *flist)
  95 {
  96         struct file_list *local_file_list;
  97         int i, j;
  98         char *argv[1], fbuf[MAXPATHLEN];
  99         static int deletion_count;
 100
 101         if (cvs_exclude)
 102                 add_cvs_excludes();
 103
 104         if (io_error && !(lp_ignore_errors(module_id) || ignore_errors)) {
 105                 rprintf(FINFO,"IO error encountered - skipping file deletion\n");
 106                 return;
 107         }
 108
 109         for (j = 0; j < flist->count; j++) {
 110                 if (!(flist->files[j]->flags & FLAG_TOP_DIR)
 111                     || !S_ISDIR(flist->files[j]->mode))
 112                         continue;
 113
 114                 argv[0] = f_name_to(flist->files[j], fbuf);
 115
 116                 if (!(local_file_list = send_file_list(-1, 1, argv)))
 117                         continue;
 118
 119                 if (verbose > 1)
 120                         rprintf(FINFO, "deleting in %s\n", safe_fname(fbuf));
 121
 122                 for (i = local_file_list->count-1; i >= 0; i--) {
 123                         if (max_delete && deletion_count > max_delete)
 124                                 break;
 125                         if (!local_file_list->files[i]->basename)
 126                                 continue;
 127                         if (flist_find(flist,local_file_list->files[i]) < 0) {
 128                                 char *f = f_name(local_file_list->files[i]);
 129                                 if (make_backups && (backup_dir || !is_backup_file(f))) {
 130                                         make_backup(f);
 131                                         if (verbose) {
 132                                                 rprintf(FINFO, "deleting %s\n",
 133                                                         safe_fname(f));
 134                                         }
 135                                 } else {
 136                                         int mode = local_file_list->files[i]->mode;
 137                                         delete_one(f, S_ISDIR(mode) != 0);
 138                                 }
 139                                 deletion_count++;
 140                         }
 141                 }
 142                 flist_free(local_file_list);
 143         }
 144 }
 145
 146
 147 /*
 148  * get_tmpname() - create a tmp filename for a given filename
 149  *
 150  *   If a tmpdir is defined, use that as the directory to
 151  *   put it in.  Otherwise, the tmp filename is in the same
 152  *   directory as the given name.  Note that there may be no
 153  *   directory at all in the given name!
 154  *
 155  *   The tmp filename is basically the given filename with a
 156  *   dot prepended, and .XXXXXX appended (for mkstemp() to
 157  *   put its unique gunk in).  Take care to not exceed
 158  *   either the MAXPATHLEN or NAME_MAX, esp. the last, as
 159  *   the basename basically becomes 8 chars longer. In that
 160  *   case, the original name is shortened sufficiently to
 161  *   make it all fit.
 162  *
 163  *   Of course, there's no real reason for the tmp name to
 164  *   look like the original, except to satisfy us humans.
 165  *   As long as it's unique, rsync will work.
 166  */
 167
 168 static int get_tmpname(char *fnametmp, char *fname)
 169 {
 170         char *f;
 171         int     length = 0;
 172         int     maxname;
 173
 174         if (tmpdir) {
 175                 /* Note: this can't overflow, so the return value is safe */
 176                 length = strlcpy(fnametmp, tmpdir, MAXPATHLEN - 2);
 177                 fnametmp[length++] = '/';
 178                 fnametmp[length] = '\0';        /* always NULL terminated */
 179         }
 180
 181         if ((f = strrchr(fname, '/')) != NULL) {
 182                 ++f;
 183                 if (!tmpdir) {
 184                         length = f - fname;
 185                         /* copy up to and including the slash */
 186                         strlcpy(fnametmp, fname, length + 1);
 187                 }
 188         } else
 189                 f = fname;
 190         fnametmp[length++] = '.';
 191         fnametmp[length] = '\0';                /* always NULL terminated */
 192
 193         maxname = MIN(MAXPATHLEN - 7 - length, NAME_MAX - 8);
 194
 195         if (maxname < 1) {
 196                 rprintf(FERROR, "temporary filename too long: %s\n", fname);
 197                 fnametmp[0] = '\0';
 198                 return 0;
 199         }
 200
 201         strlcpy(fnametmp + length, f, maxname);
 202         strcat(fnametmp + length, ".XXXXXX");
 203
 204         return 1;
 205 }
 206
 207
 208 static int receive_data(int f_in, char *fname_r, int fd_r, OFF_T size_r,
 209                         char *fname, int fd, OFF_T total_size)
 210 {
 211         static char file_sum1[MD4_SUM_LENGTH];
 212         static char file_sum2[MD4_SUM_LENGTH];
 213         struct map_struct *mapbuf;
 214         struct sum_struct sum;
 215         unsigned int len;
 216         OFF_T offset = 0;
 217         OFF_T offset2;
 218         char *data;
 219         int i;
 220         char *map = NULL;
 221
 222         read_sum_head(f_in, &sum);
 223
 224         if (fd_r >= 0 && size_r > 0) {
 225                 mapbuf = map_file(fd_r, size_r, sum.blength);
 226                 if (verbose > 2) {
 227                         rprintf(FINFO, "recv mapped %s of size %.0f\n",
 228                                 safe_fname(fname_r), (double)size_r);
 229                 }
 230         } else
 231                 mapbuf = NULL;
 232
 233         sum_init(checksum_seed);
 234
 235         while ((i = recv_token(f_in, &data)) != 0) {
 236                 if (do_progress)
 237                         show_progress(offset, total_size);
 238
 239                 if (i > 0) {
 240                         if (verbose > 3) {
 241                                 rprintf(FINFO,"data recv %d at %.0f\n",
 242                                         i,(double)offset);
 243                         }
 244
 245                         stats.literal_data += i;
 246                         cleanup_got_literal = 1;
 247
 248                         sum_update(data,i);
 249
 250                         if (fd != -1 && write_file(fd,data,i) != i) {
 251                                 rsyserr(FERROR, errno, "write failed on %s",
 252                                         full_fname(fname));
 253                                 exit_cleanup(RERR_FILEIO);
 254                         }
 255                         offset += i;
 256                         continue;
 257                 }
 258
 259                 i = -(i+1);
 260                 offset2 = i*(OFF_T)sum.blength;
 261                 len = sum.blength;
 262                 if (i == (int)sum.count-1 && sum.remainder != 0)
 263                         len = sum.remainder;
 264
 265                 stats.matched_data += len;
 266
 267                 if (verbose > 3)
 268                         rprintf(FINFO,"chunk[%d] of size %d at %.0f offset=%.0f\n",
 269                                 i,len,(double)offset2,(double)offset);
 270
 271                 if (mapbuf) {
 272                         map = map_ptr(mapbuf,offset2,len);
 273
 274                         see_token(map, len);
 275                         sum_update(map,len);
 276                 }
 277
 278                 if (!inplace || offset != offset2) {
 279                         if (fd != -1 && write_file(fd, map, len) != (int)len) {
 280                                 rsyserr(FERROR, errno, "write failed on %s",
 281                                         full_fname(fname));
 282                                 exit_cleanup(RERR_FILEIO);
 283                         }
 284                 } else {
 285                         flush_write_file(fd);
 286                         if (do_lseek(fd,(OFF_T)len,SEEK_CUR) != offset+len) {
 287                                 rprintf(FERROR, "lseek failed on %s: %s, %lli, %lli, %i\n",
 288                                         full_fname(fname), strerror(errno),
 289                                         do_lseek(fd, 0, SEEK_CUR),
 290                                         offset + len, i);
 291                                 exit_cleanup(RERR_FILEIO);
 292                         }
 293                 }
 294                 offset += len;
 295         }
 296
 297         flush_write_file(fd);
 298
 299 #ifdef HAVE_FTRUNCATE
 300         if (inplace)
 301                 ftruncate(fd, offset);
 302 #endif
 303
 304         if (do_progress)
 305                 end_progress(total_size);
 306
 307         if (fd != -1 && offset > 0 && sparse_end(fd) != 0) {
 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 {
 339         int next_gen_i = -1;
 340         int fd1,fd2;
 341         STRUCT_STAT st;
 342         char *fname, fbuf[MAXPATHLEN];
 343         char template[MAXPATHLEN];
 344         char fnametmp[MAXPATHLEN];
 345         char *fnamecmp;
 346         char fnamecmpbuf[MAXPATHLEN];
 347         struct file_struct *file;
 348         struct stats initial_stats;
 349         int save_make_backups = make_backups;
 350         int i, recv_ok, phase = 0;
 351
 352         if (verbose > 2)
 353                 rprintf(FINFO,"recv_files(%d) starting\n",flist->count);
 354
 355         if (flist->hlink_pool) {
 356                 pool_destroy(flist->hlink_pool);
 357                 flist->hlink_pool = NULL;
 358         }
 359
 360         while (1) {
 361                 cleanup_disable();
 362
 363                 i = read_int(f_in);
 364                 if (i == -1) {
 365                         if (read_batch) {
 366                                 if (next_gen_i != flist->count)
 367                                         while (read_int(batch_gen_fd) != -1) {}
 368                                 next_gen_i = -1;
 369                         }
 370
 371                         if (phase)
 372                                 break;
 373
 374                         phase = 1;
 375                         csum_length = SUM_LENGTH;
 376                         if (verbose > 2)
 377                                 rprintf(FINFO, "recv_files phase=%d\n", phase);
 378                         send_msg(MSG_DONE, "", 0);
 379                         if (keep_partial)
 380                                 make_backups = 0; /* prevents double backup */
 381                         continue;
 382                 }
 383
 384                 if (i < 0 || i >= flist->count) {
 385                         rprintf(FERROR,"Invalid file index %d in recv_files (count=%d)\n",
 386                                 i, flist->count);
 387                         exit_cleanup(RERR_PROTOCOL);
 388                 }
 389
 390                 file = flist->files[i];
 391
 392                 stats.current_file_index = i;
 393                 stats.num_transferred_files++;
 394                 stats.total_transferred_size += file->length;
 395                 cleanup_got_literal = 0;
 396
 397                 if (local_name)
 398                         fname = local_name;
 399                 else
 400                         fname = f_name_to(file, fbuf);
 401
 402                 if (dry_run) {
 403                         if (!am_server && verbose) /* log the transfer */
 404                                 rprintf(FINFO, "%s\n", safe_fname(fname));
 405                         continue;
 406                 }
 407
 408                 initial_stats = stats;
 409
 410                 if (verbose > 2)
 411                         rprintf(FINFO, "recv_files(%s)\n", safe_fname(fname));
 412
 413                 fnamecmp = fname;
 414
 415                 if (read_batch) {
 416                         while (i > next_gen_i) {
 417                                 next_gen_i = read_int(batch_gen_fd);
 418                                 if (next_gen_i == -1)
 419                                         next_gen_i = flist->count;
 420                         }
 421                         if (i < next_gen_i) {
 422                                 rprintf(FINFO, "skipping update for \"%s\"\n",
 423                                         safe_fname(fname));
 424                                 discard_receive_data(f_in, file->length);
 425                                 continue;
 426                         }
 427                 }
 428
 429                 if (server_exclude_list.head
 430                     && check_exclude(&server_exclude_list, fname,
 431                                      S_ISDIR(file->mode)) < 0) {
 432                         if (verbose) {
 433                                 rprintf(FINFO,
 434                                         "skipping server-excluded update for \"%s\"\n",
 435                                         safe_fname(fname));
 436                         }
 437                         discard_receive_data(f_in, file->length);
 438                         continue;
 439                 }
 440
 441                 /* open the file */
 442                 fd1 = do_open(fnamecmp, O_RDONLY, 0);
 443
 444                 if (fd1 == -1 && compare_dest != NULL) {
 445                         /* try the file at compare_dest instead */
 446                         pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 447                                  compare_dest, fname);
 448                         fnamecmp = fnamecmpbuf;
 449                         fd1 = do_open(fnamecmp, O_RDONLY, 0);
 450                 }
 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(fnamecmp, O_WRONLY|O_CREAT, 0);
 488                         if (fd2 == -1) {
 489                                 rsyserr(FERROR, errno, "open %s failed",
 490                                         full_fname(fnamecmp));
 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                         cleanup_set(fnametmp, fname, file, fd1, fd2);
 532                 }
 533
 534                 if (!am_server && verbose) /* log the transfer */
 535                         rprintf(FINFO, "%s\n", safe_fname(fname));
 536
 537                 /* recv file data */
 538                 recv_ok = receive_data(f_in, fnamecmp, fd1, st.st_size,
 539                                        fname, fd2, file->length);
 540
 541                 log_recv(file, &initial_stats);
 542
 543                 if (fd1 != -1)
 544                         close(fd1);
 545                 if (close(fd2) < 0) {
 546                         rsyserr(FERROR, errno, "close failed on %s",
 547                                 full_fname(fnametmp));
 548                         exit_cleanup(RERR_FILEIO);
 549                 }
 550
 551                 if (recv_ok || keep_partial || inplace)
 552                         finish_transfer(fname, fnametmp, file, recv_ok);
 553                 else
 554                         do_unlink(fnametmp);
 555
 556                 cleanup_disable();
 557
 558                 if (!recv_ok) {
 559                         int msgtype = csum_length == SUM_LENGTH || read_batch ?
 560                                 FERROR : FINFO;
 561                         if (msgtype == FERROR || verbose) {
 562                                 char *errstr, *redostr;
 563                                 char *keptstr = keep_partial || inplace ?
 564                                         "retain" : "discard";
 565                                 if (msgtype == FERROR) {
 566                                         errstr = "ERROR";
 567                                         redostr = "";
 568                                 } else {
 569                                         errstr = "WARNING";
 570                                         redostr = " (will try again)";
 571                                 }
 572                                 rprintf(msgtype,
 573                                         "%s: %s failed verification -- update %sed%s.\n",
 574                                         errstr, safe_fname(fname),
 575                                         keptstr, redostr);
 576                         }
 577                         if (csum_length != SUM_LENGTH) {
 578                                 char buf[4];
 579                                 SIVAL(buf, 0, i);
 580                                 send_msg(MSG_REDO, buf, 4);
 581                         }
 582                 }
 583         }
 584         make_backups = save_make_backups;
 585
 586         if (delete_after && recurse && !local_name && flist->count > 0)
 587                 delete_files(flist);
 588
 589         if (verbose > 2)
 590                 rprintf(FINFO,"recv_files finished\n");
 591
 592         return 0;
 593 }