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 log_before_transfer;
  25 extern int delete_after;
  26 extern int csum_length;
  27 extern struct stats stats;
  28 extern int dry_run;
  29 extern int read_batch;
  30 extern int batch_gen_fd;
  31 extern int am_server;
  32 extern int protocol_version;
  33 extern int relative_paths;
  34 extern int keep_dirlinks;
  35 extern int preserve_hard_links;
  36 extern int preserve_perms;
  37 extern int io_error;
  38 extern char *tmpdir;
  39 extern char *partial_dir;
  40 extern char *basis_dir[];
  41 extern int basis_dir_cnt;
  42 extern int make_backups;
  43 extern int do_progress;
  44 extern int cleanup_got_literal;
  45 extern int module_id;
  46 extern int ignore_errors;
  47 extern int orig_umask;
  48 extern int keep_partial;
  49 extern int checksum_seed;
  50 extern int inplace;
  51 extern int delay_updates;
  52 extern char *log_format;
  53
  54 extern struct filter_list_struct server_filter_list;
  55
  56
  57 /* This deletes any files on the receiving side that are not present on the
  58  * sending side.  This is used by --delete-before and --delete-after. */
  59 void delete_files(struct file_list *flist)
  60 {
  61         char fbuf[MAXPATHLEN];
  62         int j;
  63
  64         for (j = 0; j < flist->count; j++) {
  65                 struct file_struct *file = flist->files[j];
  66
  67                 if (!(file->flags & FLAG_DEL_HERE))
  68                         continue;
  69
  70                 f_name_to(file, fbuf);
  71                 if (verbose > 1 && file->flags & FLAG_TOP_DIR)
  72                         rprintf(FINFO, "deleting in %s\n", safe_fname(fbuf));
  73
  74                 delete_in_dir(flist, fbuf, file);
  75         }
  76 }
  77
  78
  79 /*
  80  * get_tmpname() - create a tmp filename for a given filename
  81  *
  82  *   If a tmpdir is defined, use that as the directory to
  83  *   put it in.  Otherwise, the tmp filename is in the same
  84  *   directory as the given name.  Note that there may be no
  85  *   directory at all in the given name!
  86  *
  87  *   The tmp filename is basically the given filename with a
  88  *   dot prepended, and .XXXXXX appended (for mkstemp() to
  89  *   put its unique gunk in).  Take care to not exceed
  90  *   either the MAXPATHLEN or NAME_MAX, esp. the last, as
  91  *   the basename basically becomes 8 chars longer. In that
  92  *   case, the original name is shortened sufficiently to
  93  *   make it all fit.
  94  *
  95  *   Of course, there's no real reason for the tmp name to
  96  *   look like the original, except to satisfy us humans.
  97  *   As long as it's unique, rsync will work.
  98  */
  99
 100 static int get_tmpname(char *fnametmp, char *fname)
 101 {
 102         char *f;
 103         int     length = 0;
 104         int     maxname;
 105
 106         if (tmpdir) {
 107                 /* Note: this can't overflow, so the return value is safe */
 108                 length = strlcpy(fnametmp, tmpdir, MAXPATHLEN - 2);
 109                 fnametmp[length++] = '/';
 110                 fnametmp[length] = '\0';        /* always NULL terminated */
 111         }
 112
 113         if ((f = strrchr(fname, '/')) != NULL) {
 114                 ++f;
 115                 if (!tmpdir) {
 116                         length = f - fname;
 117                         /* copy up to and including the slash */
 118                         strlcpy(fnametmp, fname, length + 1);
 119                 }
 120         } else
 121                 f = fname;
 122         fnametmp[length++] = '.';
 123         fnametmp[length] = '\0';                /* always NULL terminated */
 124
 125         maxname = MIN(MAXPATHLEN - 7 - length, NAME_MAX - 8);
 126
 127         if (maxname < 1) {
 128                 rprintf(FERROR, "temporary filename too long: %s\n",
 129                         safe_fname(fname));
 130                 fnametmp[0] = '\0';
 131                 return 0;
 132         }
 133
 134         strlcpy(fnametmp + length, f, maxname);
 135         strcat(fnametmp + length, ".XXXXXX");
 136
 137         return 1;
 138 }
 139
 140
 141 static int receive_data(int f_in, char *fname_r, int fd_r, OFF_T size_r,
 142                         char *fname, int fd, OFF_T total_size)
 143 {
 144         static char file_sum1[MD4_SUM_LENGTH];
 145         static char file_sum2[MD4_SUM_LENGTH];
 146         struct map_struct *mapbuf;
 147         struct sum_struct sum;
 148         int32 len;
 149         OFF_T offset = 0;
 150         OFF_T offset2;
 151         char *data;
 152         int32 i;
 153         char *map = NULL;
 154
 155         read_sum_head(f_in, &sum);
 156
 157         if (fd_r >= 0 && size_r > 0) {
 158                 int32 read_size = MAX(sum.blength * 2, 16*1024);
 159                 mapbuf = map_file(fd_r, size_r, read_size, sum.blength);
 160                 if (verbose > 2) {
 161                         rprintf(FINFO, "recv mapped %s of size %.0f\n",
 162                                 safe_fname(fname_r), (double)size_r);
 163                 }
 164         } else
 165                 mapbuf = NULL;
 166
 167         sum_init(checksum_seed);
 168
 169         while ((i = recv_token(f_in, &data)) != 0) {
 170                 if (do_progress)
 171                         show_progress(offset, total_size);
 172
 173                 if (i > 0) {
 174                         if (verbose > 3) {
 175                                 rprintf(FINFO,"data recv %d at %.0f\n",
 176                                         i,(double)offset);
 177                         }
 178
 179                         stats.literal_data += i;
 180                         cleanup_got_literal = 1;
 181
 182                         sum_update(data, i);
 183
 184                         if (fd != -1 && write_file(fd,data,i) != i)
 185                                 goto report_write_error;
 186                         offset += i;
 187                         continue;
 188                 }
 189
 190                 i = -(i+1);
 191                 offset2 = i * (OFF_T)sum.blength;
 192                 len = sum.blength;
 193                 if (i == (int)sum.count-1 && sum.remainder != 0)
 194                         len = sum.remainder;
 195
 196                 stats.matched_data += len;
 197
 198                 if (verbose > 3) {
 199                         rprintf(FINFO,
 200                                 "chunk[%d] of size %ld at %.0f offset=%.0f\n",
 201                                 i, (long)len, (double)offset2, (double)offset);
 202                 }
 203
 204                 if (mapbuf) {
 205                         map = map_ptr(mapbuf,offset2,len);
 206
 207                         see_token(map, len);
 208                         sum_update(map, len);
 209                 }
 210
 211                 if (inplace) {
 212                         if (offset == offset2 && fd != -1) {
 213                                 if (flush_write_file(fd) < 0)
 214                                         goto report_write_error;
 215                                 offset += len;
 216                                 if (do_lseek(fd, len, SEEK_CUR) != offset) {
 217                                         rsyserr(FERROR, errno,
 218                                                 "lseek failed on %s",
 219                                                 full_fname(fname));
 220                                         exit_cleanup(RERR_FILEIO);
 221                                 }
 222                                 continue;
 223                         }
 224                 }
 225                 if (fd != -1 && write_file(fd, map, len) != (int)len)
 226                         goto report_write_error;
 227                 offset += len;
 228         }
 229
 230         if (flush_write_file(fd) < 0)
 231                 goto report_write_error;
 232
 233 #ifdef HAVE_FTRUNCATE
 234         if (inplace && fd != -1)
 235                 ftruncate(fd, offset);
 236 #endif
 237
 238         if (do_progress)
 239                 end_progress(total_size);
 240
 241         if (fd != -1 && offset > 0 && sparse_end(fd) != 0) {
 242             report_write_error:
 243                 rsyserr(FERROR, errno, "write failed on %s",
 244                         full_fname(fname));
 245                 exit_cleanup(RERR_FILEIO);
 246         }
 247
 248         sum_end(file_sum1);
 249
 250         if (mapbuf)
 251                 unmap_file(mapbuf);
 252
 253         read_buf(f_in,file_sum2,MD4_SUM_LENGTH);
 254         if (verbose > 2)
 255                 rprintf(FINFO,"got file_sum\n");
 256         if (fd != -1 && memcmp(file_sum1, file_sum2, MD4_SUM_LENGTH) != 0)
 257                 return 0;
 258         return 1;
 259 }
 260
 261
 262 static void read_gen_name(int fd, char *dirname, char *buf)
 263 {
 264         int dlen;
 265         int len = read_byte(fd);
 266
 267         if (len & 0x80) {
 268 #if MAXPATHLEN > 32767
 269                 uchar lenbuf[2];
 270                 read_buf(fd, (char *)lenbuf, 2);
 271                 len = (len & ~0x80) * 0x10000 + lenbuf[0] * 0x100 + lenbuf[1];
 272 #else
 273                 len = (len & ~0x80) * 0x100 + read_byte(fd);
 274 #endif
 275         }
 276
 277         if (dirname) {
 278                 dlen = strlcpy(buf, dirname, MAXPATHLEN);
 279                 buf[dlen++] = '/';
 280         } else
 281                 dlen = 0;
 282
 283         if (dlen + len >= MAXPATHLEN) {
 284                 rprintf(FERROR, "bogus data on generator name pipe\n");
 285                 exit_cleanup(RERR_PROTOCOL);
 286         }
 287
 288         read_sbuf(fd, buf + dlen, len);
 289 }
 290
 291
 292 static void discard_receive_data(int f_in, OFF_T length)
 293 {
 294         receive_data(f_in, NULL, -1, 0, NULL, -1, length);
 295 }
 296
 297
 298 /**
 299  * main routine for receiver process.
 300  *
 301  * Receiver process runs on the same host as the generator process. */
 302 int recv_files(int f_in, struct file_list *flist, char *local_name,
 303                int f_in_name)
 304 {
 305         int next_gen_i = -1;
 306         int fd1,fd2;
 307         STRUCT_STAT st;
 308         int iflags;
 309         char *fname, fbuf[MAXPATHLEN];
 310         char template[MAXPATHLEN];
 311         char fnametmp[MAXPATHLEN];
 312         char *fnamecmp, *partialptr;
 313         char fnamecmpbuf[MAXPATHLEN];
 314         uchar *delayed_bits = NULL;
 315         struct file_struct *file;
 316         struct stats initial_stats;
 317         int save_make_backups = make_backups;
 318         int i, recv_ok, phase = 0;
 319
 320         if (verbose > 2)
 321                 rprintf(FINFO,"recv_files(%d) starting\n",flist->count);
 322
 323         if (flist->hlink_pool) {
 324                 pool_destroy(flist->hlink_pool);
 325                 flist->hlink_pool = NULL;
 326         }
 327
 328         if (delay_updates) {
 329                 int sz = (flist->count + 7) / 8;
 330                 if (!(delayed_bits = new_array(uchar, sz)))
 331                         out_of_memory("recv_files");
 332                 memset(delayed_bits, 0, sz);
 333         }
 334
 335         while (1) {
 336                 cleanup_disable();
 337
 338                 i = read_int(f_in);
 339                 if (i == -1) {
 340                         if (read_batch) {
 341                                 if (next_gen_i != flist->count) {
 342                                         do {
 343                                                 if (f_in_name >= 0
 344                                                     && next_gen_i >= 0)
 345                                                         read_byte(f_in_name);
 346                                         } while (read_int(batch_gen_fd) != -1);
 347                                 }
 348                                 next_gen_i = -1;
 349                         }
 350
 351                         if (phase)
 352                                 break;
 353
 354                         phase = 1;
 355                         csum_length = SUM_LENGTH;
 356                         if (verbose > 2)
 357                                 rprintf(FINFO, "recv_files phase=%d\n", phase);
 358                         send_msg(MSG_DONE, "", 0);
 359                         if (keep_partial && !partial_dir)
 360                                 make_backups = 0; /* prevents double backup */
 361                         continue;
 362                 }
 363
 364                 if (i < 0 || i >= flist->count) {
 365                         rprintf(FERROR,"Invalid file index %d in recv_files (count=%d)\n",
 366                                 i, flist->count);
 367                         exit_cleanup(RERR_PROTOCOL);
 368                 }
 369
 370                 file = flist->files[i];
 371
 372                 if (protocol_version >= 29) {
 373                         iflags = read_byte(f_in);
 374                         iflags |= read_byte(f_in) << 8;
 375                         if (!(iflags & ITEM_UPDATING) || !S_ISREG(file->mode)) {
 376                                 if (!dry_run || !am_server)
 377                                         log_recv(file, &stats, iflags);
 378                                 continue;
 379                         }
 380                 } else
 381                         iflags = ITEM_UPDATING | ITEM_MISSING_DATA;
 382
 383                 if (!S_ISREG(file->mode)) {
 384                         rprintf(FERROR, "[%s] got index of non-regular file: %d\n",
 385                                 who_am_i(), i);
 386                         exit_cleanup(RERR_PROTOCOL);
 387                 }
 388
 389                 stats.current_file_index = i;
 390                 stats.num_transferred_files++;
 391                 stats.total_transferred_size += file->length;
 392                 cleanup_got_literal = 0;
 393
 394                 fname = local_name ? local_name : f_name_to(file, fbuf);
 395
 396                 if (server_filter_list.head
 397                     && check_filter(&server_filter_list, fname, 0) < 0) {
 398                         rprintf(FERROR, "attempt to hack rsync failed.\n");
 399                         exit_cleanup(RERR_PROTOCOL);
 400                 }
 401
 402                 if (verbose > 2)
 403                         rprintf(FINFO, "recv_files(%s)\n", safe_fname(fname));
 404
 405                 if (dry_run) { /* log the transfer */
 406                         if (!am_server && log_format)
 407                                 log_recv(file, &stats, iflags);
 408                         continue;
 409                 }
 410
 411                 if (read_batch) {
 412                         while (i > next_gen_i) {
 413                                 if (f_in_name >= 0 && next_gen_i >= 0)
 414                                         read_byte(f_in_name);
 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                         next_gen_i = -1;
 426                 }
 427
 428                 partialptr = partial_dir ? partial_dir_fname(fname) : fname;
 429
 430                 if (f_in_name >= 0) {
 431                         uchar j;
 432                         switch (j = read_byte(f_in_name)) {
 433                         case FNAMECMP_FNAME:
 434                                 fnamecmp = fname;
 435                                 break;
 436                         case FNAMECMP_PARTIAL_DIR:
 437                                 fnamecmp = partialptr ? partialptr : fname;
 438                                 break;
 439                         case FNAMECMP_BACKUP:
 440                                 fnamecmp = get_backup_name(fname);
 441                                 break;
 442                         case FNAMECMP_FUZZY:
 443                                 read_gen_name(f_in_name, file->dirname, fnamecmpbuf);
 444                                 fnamecmp = fnamecmpbuf;
 445                                 break;
 446                         default:
 447                                 if (j >= basis_dir_cnt) {
 448                                         rprintf(FERROR,
 449                                                 "invalid basis_dir index: %d.\n",
 450                                                 j);
 451                                         exit_cleanup(RERR_PROTOCOL);
 452                                 }
 453                                 pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 454                                          basis_dir[j], fname);
 455                                 fnamecmp = fnamecmpbuf;
 456                                 break;
 457                         }
 458                 } else
 459                         fnamecmp = fname;
 460
 461                 initial_stats = stats;
 462
 463                 /* open the file */
 464                 fd1 = do_open(fnamecmp, O_RDONLY, 0);
 465
 466                 if (fd1 != -1 && do_fstat(fd1,&st) != 0) {
 467                         rsyserr(FERROR, errno, "fstat %s failed",
 468                                 full_fname(fnamecmp));
 469                         discard_receive_data(f_in, file->length);
 470                         close(fd1);
 471                         continue;
 472                 }
 473
 474                 if (fd1 != -1 && S_ISDIR(st.st_mode) && fnamecmp == fname) {
 475                         /* this special handling for directories
 476                          * wouldn't be necessary if robust_rename()
 477                          * and the underlying robust_unlink could cope
 478                          * with directories
 479                          */
 480                         rprintf(FERROR,"recv_files: %s is a directory\n",
 481                                 full_fname(fnamecmp));
 482                         discard_receive_data(f_in, file->length);
 483                         close(fd1);
 484                         continue;
 485                 }
 486
 487                 if (fd1 != -1 && !S_ISREG(st.st_mode)) {
 488                         close(fd1);
 489                         fd1 = -1;
 490                 }
 491
 492                 if (fd1 != -1 && !preserve_perms) {
 493                         /* if the file exists already and we aren't preserving
 494                          * permissions then act as though the remote end sent
 495                          * us the file permissions we already have */
 496                         file->mode = st.st_mode;
 497                 }
 498
 499                 /* We now check to see if we are writing file "inplace" */
 500                 if (inplace)  {
 501                         fd2 = do_open(fname, O_WRONLY|O_CREAT, 0);
 502                         if (fd2 == -1) {
 503                                 rsyserr(FERROR, errno, "open %s failed",
 504                                         full_fname(fname));
 505                                 discard_receive_data(f_in, file->length);
 506                                 if (fd1 != -1)
 507                                         close(fd1);
 508                                 continue;
 509                         }
 510                 } else {
 511                         if (!get_tmpname(fnametmp,fname)) {
 512                                 discard_receive_data(f_in, file->length);
 513                                 if (fd1 != -1)
 514                                         close(fd1);
 515                                 continue;
 516                         }
 517
 518                         strlcpy(template, fnametmp, sizeof template);
 519
 520                         /* we initially set the perms without the
 521                          * setuid/setgid bits to ensure that there is no race
 522                          * condition. They are then correctly updated after
 523                          * the lchown. Thanks to snabb@epipe.fi for pointing
 524                          * this out.  We also set it initially without group
 525                          * access because of a similar race condition. */
 526                         fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 527
 528                         /* in most cases parent directories will already exist
 529                          * because their information should have been previously
 530                          * transferred, but that may not be the case with -R */
 531                         if (fd2 == -1 && relative_paths && errno == ENOENT
 532                             && create_directory_path(fnametmp, orig_umask) == 0) {
 533                                 strlcpy(fnametmp, template, sizeof fnametmp);
 534                                 fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 535                         }
 536                         if (fd2 == -1) {
 537                                 rsyserr(FERROR, errno, "mkstemp %s failed",
 538                                         full_fname(fnametmp));
 539                                 discard_receive_data(f_in, file->length);
 540                                 if (fd1 != -1)
 541                                         close(fd1);
 542                                 continue;
 543                         }
 544
 545                         if (partialptr)
 546                                 cleanup_set(fnametmp, partialptr, file, fd1, fd2);
 547                 }
 548
 549                 /* log the transfer */
 550                 if (log_before_transfer)
 551                         log_recv(file, &initial_stats, iflags);
 552                 else if (!am_server && verbose && do_progress)
 553                         rprintf(FINFO, "%s\n", safe_fname(fname));
 554
 555                 /* recv file data */
 556                 recv_ok = receive_data(f_in, fnamecmp, fd1, st.st_size,
 557                                        fname, fd2, file->length);
 558
 559                 if (!log_before_transfer)
 560                         log_recv(file, &initial_stats, iflags);
 561
 562                 if (fd1 != -1)
 563                         close(fd1);
 564                 if (close(fd2) < 0) {
 565                         rsyserr(FERROR, errno, "close failed on %s",
 566                                 full_fname(fnametmp));
 567                         exit_cleanup(RERR_FILEIO);
 568                 }
 569
 570                 if ((recv_ok && (!delay_updates || !partialptr)) || inplace) {
 571                         finish_transfer(fname, fnametmp, file, recv_ok, 1);
 572                         if (partialptr != fname && fnamecmp == partialptr) {
 573                                 do_unlink(partialptr);
 574                                 handle_partial_dir(partialptr, PDIR_DELETE);
 575                         }
 576                 } else if (keep_partial && partialptr
 577                     && handle_partial_dir(partialptr, PDIR_CREATE)) {
 578                         finish_transfer(partialptr, fnametmp, file, recv_ok,
 579                                         !partial_dir);
 580                         if (delay_updates && recv_ok)
 581                                 delayed_bits[i/8] |= 1 << (i % 8);
 582                 } else {
 583                         partialptr = NULL;
 584                         do_unlink(fnametmp);
 585                 }
 586
 587                 cleanup_disable();
 588
 589                 if (!recv_ok) {
 590                         int msgtype = csum_length == SUM_LENGTH || read_batch ?
 591                                 FERROR : FINFO;
 592                         if (msgtype == FERROR || verbose) {
 593                                 char *errstr, *redostr, *keptstr;
 594                                 if (!(keep_partial && partialptr) && !inplace)
 595                                         keptstr = "discarded";
 596                                 else if (partial_dir)
 597                                         keptstr = "put into partial-dir";
 598                                 else
 599                                         keptstr = "retained";
 600                                 if (msgtype == FERROR) {
 601                                         errstr = "ERROR";
 602                                         redostr = "";
 603                                 } else {
 604                                         errstr = "WARNING";
 605                                         redostr = " (will try again)";
 606                                 }
 607                                 rprintf(msgtype,
 608                                         "%s: %s failed verification -- update %s%s.\n",
 609                                         errstr, safe_fname(fname),
 610                                         keptstr, redostr);
 611                         }
 612                         if (csum_length != SUM_LENGTH) {
 613                                 char buf[4];
 614                                 SIVAL(buf, 0, i);
 615                                 send_msg(MSG_REDO, buf, 4);
 616                         }
 617                 }
 618         }
 619         make_backups = save_make_backups;
 620
 621         if (delay_updates) {
 622                 for (i = 0; i < flist->count; i++) {
 623                         struct file_struct *file = flist->files[i];
 624                         if (!file->basename
 625                          || !(delayed_bits[i/8] & (1 << (i % 8))))
 626                                 continue;
 627                         fname = local_name ? local_name : f_name(file);
 628                         partialptr = partial_dir_fname(fname);
 629                         if (partialptr) {
 630                                 if (make_backups && !make_backup(fname))
 631                                         continue;
 632                                 if (verbose > 2) {
 633                                         rprintf(FINFO, "renaming %s to %s\n",
 634                                                 safe_fname(partialptr),
 635                                                 safe_fname(fname));
 636                                 }
 637                                 if (do_rename(partialptr, fname) < 0) {
 638                                         rsyserr(FERROR, errno,
 639                                                 "rename failed for %s (from %s)",
 640                                                 full_fname(fname),
 641                                                 safe_fname(partialptr));
 642                                 } else {
 643                                         handle_partial_dir(partialptr,
 644                                                            PDIR_DELETE);
 645                                 }
 646                         }
 647                 }
 648         }
 649
 650         if (delete_after && !local_name && flist->count > 0)
 651                 delete_files(flist);
 652
 653         if (verbose > 2)
 654                 rprintf(FINFO,"recv_files finished\n");
 655
 656         return 0;
 657 }