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