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