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 itemize_changes;
  26 extern int delete_after;
  27 extern int csum_length;
  28 extern struct stats stats;
  29 extern int dry_run;
  30 extern int read_batch;
  31 extern int batch_gen_fd;
  32 extern int am_server;
  33 extern int protocol_version;
  34 extern int relative_paths;
  35 extern int keep_dirlinks;
  36 extern int preserve_hard_links;
  37 extern int preserve_perms;
  38 extern int io_error;
  39 extern char *tmpdir;
  40 extern char *partial_dir;
  41 extern char *basis_dir[];
  42 extern int basis_dir_cnt;
  43 extern int make_backups;
  44 extern int do_progress;
  45 extern int cleanup_got_literal;
  46 extern int module_id;
  47 extern int ignore_errors;
  48 extern int orig_umask;
  49 extern int keep_partial;
  50 extern int checksum_seed;
  51 extern int inplace;
  52 extern int delay_updates;
  53 extern char *log_format;
  54
  55 extern struct filter_list_struct server_filter_list;
  56
  57
  58 /* This deletes any files on the receiving side that are not present on the
  59  * sending side.  This is used by --delete-before and --delete-after. */
  60 void delete_files(struct file_list *flist)
  61 {
  62         char fbuf[MAXPATHLEN];
  63         int j;
  64
  65         for (j = 0; j < flist->count; j++) {
  66                 struct file_struct *file = flist->files[j];
  67
  68                 if (!(file->flags & FLAG_DEL_HERE))
  69                         continue;
  70
  71                 f_name_to(file, fbuf);
  72                 if (verbose > 1 && file->flags & FLAG_TOP_DIR)
  73                         rprintf(FINFO, "deleting in %s\n", safe_fname(fbuf));
  74
  75                 delete_in_dir(flist, fbuf, file);
  76         }
  77 }
  78
  79
  80 /*
  81  * get_tmpname() - create a tmp filename for a given filename
  82  *
  83  *   If a tmpdir is defined, use that as the directory to
  84  *   put it in.  Otherwise, the tmp filename is in the same
  85  *   directory as the given name.  Note that there may be no
  86  *   directory at all in the given name!
  87  *
  88  *   The tmp filename is basically the given filename with a
  89  *   dot prepended, and .XXXXXX appended (for mkstemp() to
  90  *   put its unique gunk in).  Take care to not exceed
  91  *   either the MAXPATHLEN or NAME_MAX, esp. the last, as
  92  *   the basename basically becomes 8 chars longer. In that
  93  *   case, the original name is shortened sufficiently to
  94  *   make it all fit.
  95  *
  96  *   Of course, there's no real reason for the tmp name to
  97  *   look like the original, except to satisfy us humans.
  98  *   As long as it's unique, rsync will work.
  99  */
 100
 101 static int get_tmpname(char *fnametmp, char *fname)
 102 {
 103         char *f;
 104         int     length = 0;
 105         int     maxname;
 106
 107         if (tmpdir) {
 108                 /* Note: this can't overflow, so the return value is safe */
 109                 length = strlcpy(fnametmp, tmpdir, MAXPATHLEN - 2);
 110                 fnametmp[length++] = '/';
 111                 fnametmp[length] = '\0';        /* always NULL terminated */
 112         }
 113
 114         if ((f = strrchr(fname, '/')) != NULL) {
 115                 ++f;
 116                 if (!tmpdir) {
 117                         length = f - fname;
 118                         /* copy up to and including the slash */
 119                         strlcpy(fnametmp, fname, length + 1);
 120                 }
 121         } else
 122                 f = fname;
 123         fnametmp[length++] = '.';
 124         fnametmp[length] = '\0';                /* always NULL terminated */
 125
 126         maxname = MIN(MAXPATHLEN - 7 - length, NAME_MAX - 8);
 127
 128         if (maxname < 1) {
 129                 rprintf(FERROR, "temporary filename too long: %s\n",
 130                         safe_fname(fname));
 131                 fnametmp[0] = '\0';
 132                 return 0;
 133         }
 134
 135         strlcpy(fnametmp + length, f, maxname);
 136         strcat(fnametmp + length, ".XXXXXX");
 137
 138         return 1;
 139 }
 140
 141
 142 static int receive_data(int f_in, char *fname_r, int fd_r, OFF_T size_r,
 143                         char *fname, int fd, OFF_T total_size)
 144 {
 145         static char file_sum1[MD4_SUM_LENGTH];
 146         static char file_sum2[MD4_SUM_LENGTH];
 147         struct map_struct *mapbuf;
 148         struct sum_struct sum;
 149         int32 len;
 150         OFF_T offset = 0;
 151         OFF_T offset2;
 152         char *data;
 153         int32 i;
 154         char *map = NULL;
 155
 156         read_sum_head(f_in, &sum);
 157
 158         if (fd_r >= 0 && size_r > 0) {
 159                 int32 read_size = MAX(sum.blength * 2, 16*1024);
 160                 mapbuf = map_file(fd_r, size_r, read_size, sum.blength);
 161                 if (verbose > 2) {
 162                         rprintf(FINFO, "recv mapped %s of size %.0f\n",
 163                                 safe_fname(fname_r), (double)size_r);
 164                 }
 165         } else
 166                 mapbuf = NULL;
 167
 168         sum_init(checksum_seed);
 169
 170         while ((i = recv_token(f_in, &data)) != 0) {
 171                 if (do_progress)
 172                         show_progress(offset, total_size);
 173
 174                 if (i > 0) {
 175                         if (verbose > 3) {
 176                                 rprintf(FINFO,"data recv %d at %.0f\n",
 177                                         i,(double)offset);
 178                         }
 179
 180                         stats.literal_data += i;
 181                         cleanup_got_literal = 1;
 182
 183                         sum_update(data, i);
 184
 185                         if (fd != -1 && write_file(fd,data,i) != i)
 186                                 goto report_write_error;
 187                         offset += i;
 188                         continue;
 189                 }
 190
 191                 i = -(i+1);
 192                 offset2 = i * (OFF_T)sum.blength;
 193                 len = sum.blength;
 194                 if (i == (int)sum.count-1 && sum.remainder != 0)
 195                         len = sum.remainder;
 196
 197                 stats.matched_data += len;
 198
 199                 if (verbose > 3) {
 200                         rprintf(FINFO,
 201                                 "chunk[%d] of size %ld at %.0f offset=%.0f\n",
 202                                 i, (long)len, (double)offset2, (double)offset);
 203                 }
 204
 205                 if (mapbuf) {
 206                         map = map_ptr(mapbuf,offset2,len);
 207
 208                         see_token(map, len);
 209                         sum_update(map, len);
 210                 }
 211
 212                 if (inplace) {
 213                         if (offset == offset2 && fd != -1) {
 214                                 if (flush_write_file(fd) < 0)
 215                                         goto report_write_error;
 216                                 offset += len;
 217                                 if (do_lseek(fd, len, SEEK_CUR) != offset) {
 218                                         rsyserr(FERROR, errno,
 219                                                 "lseek failed on %s",
 220                                                 full_fname(fname));
 221                                         exit_cleanup(RERR_FILEIO);
 222                                 }
 223                                 continue;
 224                         }
 225                 }
 226                 if (fd != -1 && write_file(fd, map, len) != (int)len)
 227                         goto report_write_error;
 228                 offset += len;
 229         }
 230
 231         if (flush_write_file(fd) < 0)
 232                 goto report_write_error;
 233
 234 #ifdef HAVE_FTRUNCATE
 235         if (inplace && fd != -1)
 236                 ftruncate(fd, offset);
 237 #endif
 238
 239         if (do_progress)
 240                 end_progress(total_size);
 241
 242         if (fd != -1 && offset > 0 && sparse_end(fd) != 0) {
 243             report_write_error:
 244                 rsyserr(FERROR, errno, "write failed on %s",
 245                         full_fname(fname));
 246                 exit_cleanup(RERR_FILEIO);
 247         }
 248
 249         sum_end(file_sum1);
 250
 251         if (mapbuf)
 252                 unmap_file(mapbuf);
 253
 254         read_buf(f_in,file_sum2,MD4_SUM_LENGTH);
 255         if (verbose > 2)
 256                 rprintf(FINFO,"got file_sum\n");
 257         if (fd != -1 && memcmp(file_sum1, file_sum2, MD4_SUM_LENGTH) != 0)
 258                 return 0;
 259         return 1;
 260 }
 261
 262
 263 static void read_gen_name(int fd, char *dirname, char *buf)
 264 {
 265         int dlen;
 266         int len = read_byte(fd);
 267
 268         if (len & 0x80) {
 269 #if MAXPATHLEN > 32767
 270                 uchar lenbuf[2];
 271                 read_buf(fd, (char *)lenbuf, 2);
 272                 len = (len & ~0x80) * 0x10000 + lenbuf[0] * 0x100 + lenbuf[1];
 273 #else
 274                 len = (len & ~0x80) * 0x100 + read_byte(fd);
 275 #endif
 276         }
 277
 278         if (dirname) {
 279                 dlen = strlcpy(buf, dirname, MAXPATHLEN);
 280                 buf[dlen++] = '/';
 281         } else
 282                 dlen = 0;
 283
 284         if (dlen + len >= MAXPATHLEN) {
 285                 rprintf(FERROR, "bogus data on generator name pipe\n");
 286                 exit_cleanup(RERR_PROTOCOL);
 287         }
 288
 289         read_sbuf(fd, buf + dlen, len);
 290 }
 291
 292
 293 static void discard_receive_data(int f_in, OFF_T length)
 294 {
 295         receive_data(f_in, NULL, -1, 0, NULL, -1, length);
 296 }
 297
 298
 299 /**
 300  * main routine for receiver process.
 301  *
 302  * Receiver process runs on the same host as the generator process. */
 303 int recv_files(int f_in, struct file_list *flist, char *local_name,
 304                int f_in_name)
 305 {
 306         int next_gen_i = -1;
 307         int fd1,fd2;
 308         STRUCT_STAT st;
 309         int iflags;
 310         char *fname, fbuf[MAXPATHLEN];
 311         char template[MAXPATHLEN];
 312         char fnametmp[MAXPATHLEN];
 313         char *fnamecmp, *partialptr;
 314         char fnamecmpbuf[MAXPATHLEN];
 315         uchar *delayed_bits = NULL;
 316         struct file_struct *file;
 317         struct stats initial_stats;
 318         int save_make_backups = make_backups;
 319         int i, recv_ok, phase = 0;
 320
 321         if (verbose > 2)
 322                 rprintf(FINFO,"recv_files(%d) starting\n",flist->count);
 323
 324         if (flist->hlink_pool) {
 325                 pool_destroy(flist->hlink_pool);
 326                 flist->hlink_pool = NULL;
 327         }
 328
 329         if (delay_updates) {
 330                 int sz = (flist->count + 7) / 8;
 331                 if (!(delayed_bits = new_array(uchar, sz)))
 332                         out_of_memory("recv_files");
 333                 memset(delayed_bits, 0, sz);
 334         }
 335
 336         while (1) {
 337                 cleanup_disable();
 338
 339                 i = read_int(f_in);
 340                 if (i == -1) {
 341                         if (read_batch) {
 342                                 if (next_gen_i != flist->count) {
 343                                         do {
 344                                                 if (f_in_name >= 0
 345                                                     && next_gen_i >= 0)
 346                                                         read_byte(f_in_name);
 347                                         } while (read_int(batch_gen_fd) != -1);
 348                                 }
 349                                 next_gen_i = -1;
 350                         }
 351
 352                         if (phase)
 353                                 break;
 354
 355                         phase = 1;
 356                         csum_length = SUM_LENGTH;
 357                         if (verbose > 2)
 358                                 rprintf(FINFO, "recv_files phase=%d\n", phase);
 359                         send_msg(MSG_DONE, "", 0);
 360                         if (keep_partial && !partial_dir)
 361                                 make_backups = 0; /* prevents double backup */
 362                         continue;
 363                 }
 364
 365                 if (i < 0 || i >= flist->count) {
 366                         rprintf(FERROR,"Invalid file index %d in recv_files (count=%d)\n",
 367                                 i, flist->count);
 368                         exit_cleanup(RERR_PROTOCOL);
 369                 }
 370
 371                 file = flist->files[i];
 372
 373                 if (protocol_version >= 29) {
 374                         iflags = read_shortint(f_in);
 375                         if (!(iflags & ITEM_UPDATING) || !S_ISREG(file->mode)) {
 376                                 if (am_server)
 377                                         ; /* do nothing */
 378                                 else if (itemize_changes || verbose > 1
 379                                     || iflags & ITEM_UPDATING
 380                                     || (S_ISDIR(file->mode)
 381                                      && iflags & ITEM_REPORT_TIME))
 382                                         log_recv(file, &stats, iflags);
 383                                 continue;
 384                         }
 385                 } else
 386                         iflags = ITEM_UPDATING | ITEM_MISSING_DATA;
 387
 388                 if (!S_ISREG(file->mode)) {
 389                         rprintf(FERROR, "[%s] got index of non-regular file: %d\n",
 390                                 who_am_i(), i);
 391                         exit_cleanup(RERR_PROTOCOL);
 392                 }
 393
 394                 stats.current_file_index = i;
 395                 stats.num_transferred_files++;
 396                 stats.total_transferred_size += file->length;
 397                 cleanup_got_literal = 0;
 398
 399                 fname = local_name ? local_name : f_name_to(file, fbuf);
 400
 401                 if (server_filter_list.head
 402                     && check_filter(&server_filter_list, fname, 0) < 0) {
 403                         rprintf(FERROR, "attempt to hack rsync failed.\n");
 404                         exit_cleanup(RERR_PROTOCOL);
 405                 }
 406
 407                 if (verbose > 2)
 408                         rprintf(FINFO, "recv_files(%s)\n", safe_fname(fname));
 409
 410                 if (dry_run) { /* log the transfer */
 411                         if (!am_server && log_format)
 412                                 log_recv(file, &stats, iflags);
 413                         continue;
 414                 }
 415
 416                 if (read_batch) {
 417                         while (i > next_gen_i) {
 418                                 if (f_in_name >= 0 && next_gen_i >= 0)
 419                                         read_byte(f_in_name);
 420                                 next_gen_i = read_int(batch_gen_fd);
 421                                 if (next_gen_i == -1)
 422                                         next_gen_i = flist->count;
 423                         }
 424                         if (i < next_gen_i) {
 425                                 rprintf(FINFO, "skipping update for \"%s\"\n",
 426                                         safe_fname(fname));
 427                                 discard_receive_data(f_in, file->length);
 428                                 continue;
 429                         }
 430                         next_gen_i = -1;
 431                 }
 432
 433                 partialptr = partial_dir ? partial_dir_fname(fname) : fname;
 434
 435                 if (f_in_name >= 0) {
 436                         uchar j;
 437                         switch (j = read_byte(f_in_name)) {
 438                         case FNAMECMP_FNAME:
 439                                 fnamecmp = fname;
 440                                 break;
 441                         case FNAMECMP_PARTIAL_DIR:
 442                                 fnamecmp = partialptr ? partialptr : fname;
 443                                 break;
 444                         case FNAMECMP_BACKUP:
 445                                 fnamecmp = get_backup_name(fname);
 446                                 break;
 447                         case FNAMECMP_FUZZY:
 448                                 read_gen_name(f_in_name, file->dirname, fnamecmpbuf);
 449                                 fnamecmp = fnamecmpbuf;
 450                                 break;
 451                         default:
 452                                 if (j >= basis_dir_cnt) {
 453                                         rprintf(FERROR,
 454                                                 "invalid basis_dir index: %d.\n",
 455                                                 j);
 456                                         exit_cleanup(RERR_PROTOCOL);
 457                                 }
 458                                 pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 459                                          basis_dir[j], fname);
 460                                 fnamecmp = fnamecmpbuf;
 461                                 break;
 462                         }
 463                 } else
 464                         fnamecmp = fname;
 465
 466                 initial_stats = stats;
 467
 468                 /* open the file */
 469                 fd1 = do_open(fnamecmp, O_RDONLY, 0);
 470
 471                 if (fd1 != -1 && do_fstat(fd1,&st) != 0) {
 472                         rsyserr(FERROR, errno, "fstat %s failed",
 473                                 full_fname(fnamecmp));
 474                         discard_receive_data(f_in, file->length);
 475                         close(fd1);
 476                         continue;
 477                 }
 478
 479                 if (fd1 != -1 && S_ISDIR(st.st_mode) && fnamecmp == fname) {
 480                         /* this special handling for directories
 481                          * wouldn't be necessary if robust_rename()
 482                          * and the underlying robust_unlink could cope
 483                          * with directories
 484                          */
 485                         rprintf(FERROR,"recv_files: %s is a directory\n",
 486                                 full_fname(fnamecmp));
 487                         discard_receive_data(f_in, file->length);
 488                         close(fd1);
 489                         continue;
 490                 }
 491
 492                 if (fd1 != -1 && !S_ISREG(st.st_mode)) {
 493                         close(fd1);
 494                         fd1 = -1;
 495                 }
 496
 497                 if (fd1 != -1 && !preserve_perms) {
 498                         /* if the file exists already and we aren't preserving
 499                          * permissions then act as though the remote end sent
 500                          * us the file permissions we already have */
 501                         file->mode = st.st_mode;
 502                 }
 503
 504                 /* We now check to see if we are writing file "inplace" */
 505                 if (inplace)  {
 506                         fd2 = do_open(fname, O_WRONLY|O_CREAT, 0);
 507                         if (fd2 == -1) {
 508                                 rsyserr(FERROR, errno, "open %s failed",
 509                                         full_fname(fname));
 510                                 discard_receive_data(f_in, file->length);
 511                                 if (fd1 != -1)
 512                                         close(fd1);
 513                                 continue;
 514                         }
 515                 } else {
 516                         if (!get_tmpname(fnametmp,fname)) {
 517                                 discard_receive_data(f_in, file->length);
 518                                 if (fd1 != -1)
 519                                         close(fd1);
 520                                 continue;
 521                         }
 522
 523                         strlcpy(template, fnametmp, sizeof template);
 524
 525                         /* we initially set the perms without the
 526                          * setuid/setgid bits to ensure that there is no race
 527                          * condition. They are then correctly updated after
 528                          * the lchown. Thanks to snabb@epipe.fi for pointing
 529                          * this out.  We also set it initially without group
 530                          * access because of a similar race condition. */
 531                         fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 532
 533                         /* in most cases parent directories will already exist
 534                          * because their information should have been previously
 535                          * transferred, but that may not be the case with -R */
 536                         if (fd2 == -1 && relative_paths && errno == ENOENT
 537                             && create_directory_path(fnametmp, orig_umask) == 0) {
 538                                 strlcpy(fnametmp, template, sizeof fnametmp);
 539                                 fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 540                         }
 541                         if (fd2 == -1) {
 542                                 rsyserr(FERROR, errno, "mkstemp %s failed",
 543                                         full_fname(fnametmp));
 544                                 discard_receive_data(f_in, file->length);
 545                                 if (fd1 != -1)
 546                                         close(fd1);
 547                                 continue;
 548                         }
 549
 550                         if (partialptr)
 551                                 cleanup_set(fnametmp, partialptr, file, fd1, fd2);
 552                 }
 553
 554                 /* log the transfer */
 555                 if (log_before_transfer)
 556                         log_recv(file, &initial_stats, iflags);
 557                 else if (!am_server && verbose && do_progress)
 558                         rprintf(FINFO, "%s\n", safe_fname(fname));
 559
 560                 /* recv file data */
 561                 recv_ok = receive_data(f_in, fnamecmp, fd1, st.st_size,
 562                                        fname, fd2, file->length);
 563
 564                 if (!log_before_transfer)
 565                         log_recv(file, &initial_stats, iflags);
 566
 567                 if (fd1 != -1)
 568                         close(fd1);
 569                 if (close(fd2) < 0) {
 570                         rsyserr(FERROR, errno, "close failed on %s",
 571                                 full_fname(fnametmp));
 572                         exit_cleanup(RERR_FILEIO);
 573                 }
 574
 575                 if ((recv_ok && (!delay_updates || !partialptr)) || inplace) {
 576                         finish_transfer(fname, fnametmp, file, recv_ok, 1);
 577                         if (partialptr != fname && fnamecmp == partialptr) {
 578                                 do_unlink(partialptr);
 579                                 handle_partial_dir(partialptr, PDIR_DELETE);
 580                         }
 581                 } else if (keep_partial && partialptr
 582                     && handle_partial_dir(partialptr, PDIR_CREATE)) {
 583                         finish_transfer(partialptr, fnametmp, file, recv_ok,
 584                                         !partial_dir);
 585                         if (delay_updates && recv_ok)
 586                                 delayed_bits[i/8] |= 1 << (i % 8);
 587                 } else {
 588                         partialptr = NULL;
 589                         do_unlink(fnametmp);
 590                 }
 591
 592                 cleanup_disable();
 593
 594                 if (!recv_ok) {
 595                         int msgtype = csum_length == SUM_LENGTH || read_batch ?
 596                                 FERROR : FINFO;
 597                         if (msgtype == FERROR || verbose) {
 598                                 char *errstr, *redostr, *keptstr;
 599                                 if (!(keep_partial && partialptr) && !inplace)
 600                                         keptstr = "discarded";
 601                                 else if (partial_dir)
 602                                         keptstr = "put into partial-dir";
 603                                 else
 604                                         keptstr = "retained";
 605                                 if (msgtype == FERROR) {
 606                                         errstr = "ERROR";
 607                                         redostr = "";
 608                                 } else {
 609                                         errstr = "WARNING";
 610                                         redostr = " (will try again)";
 611                                 }
 612                                 rprintf(msgtype,
 613                                         "%s: %s failed verification -- update %s%s.\n",
 614                                         errstr, safe_fname(fname),
 615                                         keptstr, redostr);
 616                         }
 617                         if (csum_length != SUM_LENGTH) {
 618                                 char buf[4];
 619                                 SIVAL(buf, 0, i);
 620                                 send_msg(MSG_REDO, buf, 4);
 621                         }
 622                 }
 623         }
 624         make_backups = save_make_backups;
 625
 626         if (delay_updates) {
 627                 for (i = 0; i < flist->count; i++) {
 628                         struct file_struct *file = flist->files[i];
 629                         if (!file->basename
 630                          || !(delayed_bits[i/8] & (1 << (i % 8))))
 631                                 continue;
 632                         fname = local_name ? local_name : f_name(file);
 633                         partialptr = partial_dir_fname(fname);
 634                         if (partialptr) {
 635                                 if (make_backups && !make_backup(fname))
 636                                         continue;
 637                                 if (verbose > 2) {
 638                                         rprintf(FINFO, "renaming %s to %s\n",
 639                                                 safe_fname(partialptr),
 640                                                 safe_fname(fname));
 641                                 }
 642                                 if (do_rename(partialptr, fname) < 0) {
 643                                         rsyserr(FERROR, errno,
 644                                                 "rename failed for %s (from %s)",
 645                                                 full_fname(fname),
 646                                                 safe_fname(partialptr));
 647                                 } else {
 648                                         handle_partial_dir(partialptr,
 649                                                            PDIR_DELETE);
 650                                 }
 651                         }
 652                 }
 653         }
 654
 655         if (delete_after && !local_name && flist->count > 0)
 656                 delete_files(flist);
 657
 658         if (verbose > 2)
 659                 rprintf(FINFO,"recv_files finished\n");
 660
 661         return 0;
 662 }