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                                 goto report_write_error;
 252                         offset += i;
 253                         continue;
 254                 }
 255
 256                 i = -(i+1);
 257                 offset2 = i*(OFF_T)sum.blength;
 258                 len = sum.blength;
 259                 if (i == (int)sum.count-1 && sum.remainder != 0)
 260                         len = sum.remainder;
 261
 262                 stats.matched_data += len;
 263
 264                 if (verbose > 3)
 265                         rprintf(FINFO,"chunk[%d] of size %d at %.0f offset=%.0f\n",
 266                                 i,len,(double)offset2,(double)offset);
 267
 268                 if (mapbuf) {
 269                         map = map_ptr(mapbuf,offset2,len);
 270
 271                         see_token(map, len);
 272                         sum_update(map,len);
 273                 }
 274
 275                 if (inplace) {
 276                         if (offset == offset2 && fd != -1) {
 277                                 if (flush_write_file(fd) < 0)
 278                                         goto report_write_error;
 279                                 offset += len;
 280                                 if (do_lseek(fd, len, SEEK_CUR) != offset) {
 281                                         rsyserr(FERROR, errno,
 282                                                 "lseek failed on %s",
 283                                                 full_fname(fname));
 284                                         exit_cleanup(RERR_FILEIO);
 285                                 }
 286                                 continue;
 287                         }
 288                 }
 289                 if (fd != -1 && write_file(fd, map, len) != (int)len)
 290                         goto report_write_error;
 291                 offset += len;
 292         }
 293
 294         flush_write_file(fd);
 295
 296 #ifdef HAVE_FTRUNCATE
 297         if (inplace && fd != -1)
 298                 ftruncate(fd, offset);
 299 #endif
 300
 301         if (do_progress)
 302                 end_progress(total_size);
 303
 304         if (fd != -1 && offset > 0 && sparse_end(fd) != 0) {
 305             report_write_error:
 306                 rsyserr(FERROR, errno, "write failed on %s",
 307                         full_fname(fname));
 308                 exit_cleanup(RERR_FILEIO);
 309         }
 310
 311         sum_end(file_sum1);
 312
 313         if (mapbuf)
 314                 unmap_file(mapbuf);
 315
 316         read_buf(f_in,file_sum2,MD4_SUM_LENGTH);
 317         if (verbose > 2)
 318                 rprintf(FINFO,"got file_sum\n");
 319         if (fd != -1 && memcmp(file_sum1, file_sum2, MD4_SUM_LENGTH) != 0)
 320                 return 0;
 321         return 1;
 322 }
 323
 324
 325 static void discard_receive_data(int f_in, OFF_T length)
 326 {
 327         receive_data(f_in, NULL, -1, 0, NULL, -1, length);
 328 }
 329
 330
 331 /**
 332  * main routine for receiver process.
 333  *
 334  * Receiver process runs on the same host as the generator process. */
 335 int recv_files(int f_in, struct file_list *flist, char *local_name)
 336 {
 337         int next_gen_i = -1;
 338         int fd1,fd2;
 339         STRUCT_STAT st;
 340         char *fname, fbuf[MAXPATHLEN];
 341         char template[MAXPATHLEN];
 342         char fnametmp[MAXPATHLEN];
 343         char *fnamecmp;
 344         char fnamecmpbuf[MAXPATHLEN];
 345         struct file_struct *file;
 346         struct stats initial_stats;
 347         int save_make_backups = make_backups;
 348         int i, recv_ok, phase = 0;
 349
 350         if (verbose > 2)
 351                 rprintf(FINFO,"recv_files(%d) starting\n",flist->count);
 352
 353         if (flist->hlink_pool) {
 354                 pool_destroy(flist->hlink_pool);
 355                 flist->hlink_pool = NULL;
 356         }
 357
 358         while (1) {
 359                 cleanup_disable();
 360
 361                 i = read_int(f_in);
 362                 if (i == -1) {
 363                         if (read_batch) {
 364                                 if (next_gen_i != flist->count)
 365                                         while (read_int(batch_gen_fd) != -1) {}
 366                                 next_gen_i = -1;
 367                         }
 368
 369                         if (phase)
 370                                 break;
 371
 372                         phase = 1;
 373                         csum_length = SUM_LENGTH;
 374                         if (verbose > 2)
 375                                 rprintf(FINFO, "recv_files phase=%d\n", phase);
 376                         send_msg(MSG_DONE, "", 0);
 377                         if (keep_partial)
 378                                 make_backups = 0; /* prevents double backup */
 379                         continue;
 380                 }
 381
 382                 if (i < 0 || i >= flist->count) {
 383                         rprintf(FERROR,"Invalid file index %d in recv_files (count=%d)\n",
 384                                 i, flist->count);
 385                         exit_cleanup(RERR_PROTOCOL);
 386                 }
 387
 388                 file = flist->files[i];
 389
 390                 stats.current_file_index = i;
 391                 stats.num_transferred_files++;
 392                 stats.total_transferred_size += file->length;
 393                 cleanup_got_literal = 0;
 394
 395                 if (local_name)
 396                         fname = local_name;
 397                 else
 398                         fname = f_name_to(file, fbuf);
 399
 400                 if (dry_run) {
 401                         if (!am_server && verbose) /* log the transfer */
 402                                 rprintf(FINFO, "%s\n", safe_fname(fname));
 403                         continue;
 404                 }
 405
 406                 initial_stats = stats;
 407
 408                 if (verbose > 2)
 409                         rprintf(FINFO, "recv_files(%s)\n", safe_fname(fname));
 410
 411                 fnamecmp = fname;
 412
 413                 if (read_batch) {
 414                         while (i > next_gen_i) {
 415                                 next_gen_i = read_int(batch_gen_fd);
 416                                 if (next_gen_i == -1)
 417                                         next_gen_i = flist->count;
 418                         }
 419                         if (i < next_gen_i) {
 420                                 rprintf(FINFO, "skipping update for \"%s\"\n",
 421                                         safe_fname(fname));
 422                                 discard_receive_data(f_in, file->length);
 423                                 continue;
 424                         }
 425                 }
 426
 427                 if (server_exclude_list.head
 428                     && check_exclude(&server_exclude_list, fname,
 429                                      S_ISDIR(file->mode)) < 0) {
 430                         if (verbose) {
 431                                 rprintf(FINFO,
 432                                         "skipping server-excluded update for \"%s\"\n",
 433                                         safe_fname(fname));
 434                         }
 435                         discard_receive_data(f_in, file->length);
 436                         continue;
 437                 }
 438
 439                 /* open the file */
 440                 fd1 = do_open(fnamecmp, O_RDONLY, 0);
 441
 442                 if (fd1 == -1 && compare_dest != NULL) {
 443                         /* try the file at compare_dest instead */
 444                         pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 445                                  compare_dest, fname);
 446                         fnamecmp = fnamecmpbuf;
 447                         fd1 = do_open(fnamecmp, O_RDONLY, 0);
 448                 }
 449
 450                 if (fd1 != -1 && do_fstat(fd1,&st) != 0) {
 451                         rsyserr(FERROR, errno, "fstat %s failed",
 452                                 full_fname(fnamecmp));
 453                         discard_receive_data(f_in, file->length);
 454                         close(fd1);
 455                         continue;
 456                 }
 457
 458                 if (fd1 != -1 && S_ISDIR(st.st_mode) && fnamecmp == fname) {
 459                         /* this special handling for directories
 460                          * wouldn't be necessary if robust_rename()
 461                          * and the underlying robust_unlink could cope
 462                          * with directories
 463                          */
 464                         rprintf(FERROR,"recv_files: %s is a directory\n",
 465                                 full_fname(fnamecmp));
 466                         discard_receive_data(f_in, file->length);
 467                         close(fd1);
 468                         continue;
 469                 }
 470
 471                 if (fd1 != -1 && !S_ISREG(st.st_mode)) {
 472                         close(fd1);
 473                         fd1 = -1;
 474                 }
 475
 476                 if (fd1 != -1 && !preserve_perms) {
 477                         /* if the file exists already and we aren't preserving
 478                          * permissions then act as though the remote end sent
 479                          * us the file permissions we already have */
 480                         file->mode = st.st_mode;
 481                 }
 482
 483                 /* We now check to see if we are writing file "inplace" */
 484                 if (inplace)  {
 485                         fd2 = do_open(fnamecmp, O_WRONLY|O_CREAT, 0);
 486                         if (fd2 == -1) {
 487                                 rsyserr(FERROR, errno, "open %s failed",
 488                                         full_fname(fnamecmp));
 489                                 discard_receive_data(f_in, file->length);
 490                                 if (fd1 != -1)
 491                                         close(fd1);
 492                                 continue;
 493                         }
 494                 } else {
 495                         if (!get_tmpname(fnametmp,fname)) {
 496                                 discard_receive_data(f_in, file->length);
 497                                 if (fd1 != -1)
 498                                         close(fd1);
 499                                 continue;
 500                         }
 501
 502                         strlcpy(template, fnametmp, sizeof template);
 503
 504                         /* we initially set the perms without the
 505                          * setuid/setgid bits to ensure that there is no race
 506                          * condition. They are then correctly updated after
 507                          * the lchown. Thanks to snabb@epipe.fi for pointing
 508                          * this out.  We also set it initially without group
 509                          * access because of a similar race condition. */
 510                         fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 511
 512                         /* in most cases parent directories will already exist
 513                          * because their information should have been previously
 514                          * transferred, but that may not be the case with -R */
 515                         if (fd2 == -1 && relative_paths && errno == ENOENT
 516                             && create_directory_path(fnametmp, orig_umask) == 0) {
 517                                 strlcpy(fnametmp, template, sizeof fnametmp);
 518                                 fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 519                         }
 520                         if (fd2 == -1) {
 521                                 rsyserr(FERROR, errno, "mkstemp %s failed",
 522                                         full_fname(fnametmp));
 523                                 discard_receive_data(f_in, file->length);
 524                                 if (fd1 != -1)
 525                                         close(fd1);
 526                                 continue;
 527                         }
 528
 529                         cleanup_set(fnametmp, fname, file, fd1, fd2);
 530                 }
 531
 532                 if (!am_server && verbose) /* log the transfer */
 533                         rprintf(FINFO, "%s\n", safe_fname(fname));
 534
 535                 /* recv file data */
 536                 recv_ok = receive_data(f_in, fnamecmp, fd1, st.st_size,
 537                                        fname, fd2, file->length);
 538
 539                 log_recv(file, &initial_stats);
 540
 541                 if (fd1 != -1)
 542                         close(fd1);
 543                 if (close(fd2) < 0) {
 544                         rsyserr(FERROR, errno, "close failed on %s",
 545                                 full_fname(fnametmp));
 546                         exit_cleanup(RERR_FILEIO);
 547                 }
 548
 549                 if (recv_ok || keep_partial || inplace)
 550                         finish_transfer(fname, fnametmp, file, recv_ok);
 551                 else
 552                         do_unlink(fnametmp);
 553
 554                 cleanup_disable();
 555
 556                 if (!recv_ok) {
 557                         int msgtype = csum_length == SUM_LENGTH || read_batch ?
 558                                 FERROR : FINFO;
 559                         if (msgtype == FERROR || verbose) {
 560                                 char *errstr, *redostr;
 561                                 char *keptstr = keep_partial || inplace ?
 562                                         "retain" : "discard";
 563                                 if (msgtype == FERROR) {
 564                                         errstr = "ERROR";
 565                                         redostr = "";
 566                                 } else {
 567                                         errstr = "WARNING";
 568                                         redostr = " (will try again)";
 569                                 }
 570                                 rprintf(msgtype,
 571                                         "%s: %s failed verification -- update %sed%s.\n",
 572                                         errstr, safe_fname(fname),
 573                                         keptstr, redostr);
 574                         }
 575                         if (csum_length != SUM_LENGTH) {
 576                                 char buf[4];
 577                                 SIVAL(buf, 0, i);
 578                                 send_msg(MSG_REDO, buf, 4);
 579                         }
 580                 }
 581         }
 582         make_backups = save_make_backups;
 583
 584         if (delete_after && recurse && !local_name && flist->count > 0)
 585                 delete_files(flist);
 586
 587         if (verbose > 2)
 588                 rprintf(FINFO,"recv_files finished\n");
 589
 590         return 0;
 591 }