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