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 preserve_hard_links;
  34 extern int preserve_perms;
  35 extern int cvs_exclude;
  36 extern int io_error;
  37 extern char *tmpdir;
  38 extern char *compare_dest;
  39 extern int make_backups;
  40 extern int do_progress;
  41 extern char *backup_dir;
  42 extern char *backup_suffix;
  43 extern int backup_suffix_len;
  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
  50 static void delete_one(char *fn, int is_dir)
  51 {
  52         if (!is_dir) {
  53                 if (robust_unlink(fn) != 0) {
  54                         rsyserr(FERROR, errno, "delete_one: unlink %s failed",
  55                                 full_fname(fn));
  56                 } else if (verbose) {
  57                         rprintf(FINFO, "deleting %s\n", fn);
  58                 }
  59         } else {
  60                 if (do_rmdir(fn) != 0) {
  61                         if (errno != ENOTEMPTY && errno != EEXIST) {
  62                                 rsyserr(FERROR, errno,
  63                                         "delete_one: rmdir %s failed",
  64                                         full_fname(fn));
  65                         }
  66                 } else if (verbose) {
  67                         rprintf(FINFO, "deleting directory %s\n", fn);
  68                 }
  69         }
  70 }
  71
  72
  73 static int is_backup_file(char *fn)
  74 {
  75         int k = strlen(fn) - backup_suffix_len;
  76         return k > 0 && strcmp(fn+k, backup_suffix) == 0;
  77 }
  78
  79
  80 /* This deletes any files on the receiving side that are not present
  81  * on the sending side. */
  82 void delete_files(struct file_list *flist)
  83 {
  84         struct file_list *local_file_list;
  85         int i, j;
  86         char *argv[1], fbuf[MAXPATHLEN];
  87         static int deletion_count;
  88
  89         if (cvs_exclude)
  90                 add_cvs_excludes();
  91
  92         if (io_error && !(lp_ignore_errors(module_id) || ignore_errors)) {
  93                 rprintf(FINFO,"IO error encountered - skipping file deletion\n");
  94                 return;
  95         }
  96
  97         for (j = 0; j < flist->count; j++) {
  98                 if (!(flist->files[j]->flags & FLAG_TOP_DIR)
  99                     || !S_ISDIR(flist->files[j]->mode))
 100                         continue;
 101
 102                 argv[0] = f_name_to(flist->files[j], fbuf);
 103
 104                 if (!(local_file_list = send_file_list(-1, 1, argv)))
 105                         continue;
 106
 107                 if (verbose > 1)
 108                         rprintf(FINFO, "deleting in %s\n", fbuf);
 109
 110                 for (i = local_file_list->count-1; i >= 0; i--) {
 111                         if (max_delete && deletion_count > max_delete)
 112                                 break;
 113                         if (!local_file_list->files[i]->basename)
 114                                 continue;
 115                         if (flist_find(flist,local_file_list->files[i]) < 0) {
 116                                 char *f = f_name(local_file_list->files[i]);
 117                                 if (make_backups && (backup_dir || !is_backup_file(f))) {
 118                                         (void) make_backup(f);
 119                                         if (verbose)
 120                                                 rprintf(FINFO, "deleting %s\n", f);
 121                                 } else {
 122                                         int mode = local_file_list->files[i]->mode;
 123                                         delete_one(f, S_ISDIR(mode) != 0);
 124                                 }
 125                                 deletion_count++;
 126                         }
 127                 }
 128                 flist_free(local_file_list);
 129         }
 130 }
 131
 132
 133 /*
 134  * get_tmpname() - create a tmp filename for a given filename
 135  *
 136  *   If a tmpdir is defined, use that as the directory to
 137  *   put it in.  Otherwise, the tmp filename is in the same
 138  *   directory as the given name.  Note that there may be no
 139  *   directory at all in the given name!
 140  *
 141  *   The tmp filename is basically the given filename with a
 142  *   dot prepended, and .XXXXXX appended (for mkstemp() to
 143  *   put its unique gunk in).  Take care to not exceed
 144  *   either the MAXPATHLEN or NAME_MAX, esp. the last, as
 145  *   the basename basically becomes 8 chars longer. In that
 146  *   case, the original name is shortened sufficiently to
 147  *   make it all fit.
 148  *
 149  *   Of course, there's no real reason for the tmp name to
 150  *   look like the original, except to satisfy us humans.
 151  *   As long as it's unique, rsync will work.
 152  */
 153
 154 static int get_tmpname(char *fnametmp, char *fname)
 155 {
 156         char *f;
 157         int     length = 0;
 158         int     maxname;
 159
 160         if (tmpdir) {
 161                 /* Note: this can't overflow, so the return value is safe */
 162                 length = strlcpy(fnametmp, tmpdir, MAXPATHLEN - 2);
 163                 fnametmp[length++] = '/';
 164                 fnametmp[length] = '\0';        /* always NULL terminated */
 165         }
 166
 167         if ((f = strrchr(fname, '/')) != NULL) {
 168                 ++f;
 169                 if (!tmpdir) {
 170                         length = f - fname;
 171                         /* copy up to and including the slash */
 172                         strlcpy(fnametmp, fname, length + 1);
 173                 }
 174         } else
 175                 f = fname;
 176         fnametmp[length++] = '.';
 177         fnametmp[length] = '\0';                /* always NULL terminated */
 178
 179         maxname = MIN(MAXPATHLEN - 7 - length, NAME_MAX - 8);
 180
 181         if (maxname < 1) {
 182                 rprintf(FERROR, "temporary filename too long: %s\n", fname);
 183                 fnametmp[0] = '\0';
 184                 return 0;
 185         }
 186
 187         strlcpy(fnametmp + length, f, maxname);
 188         strcat(fnametmp + length, ".XXXXXX");
 189
 190         return 1;
 191 }
 192
 193
 194 static int receive_data(int f_in,struct map_struct *mapbuf,int fd,char *fname,
 195                         OFF_T total_size)
 196 {
 197         int i;
 198         struct sum_struct sum;
 199         unsigned int len;
 200         OFF_T offset = 0;
 201         OFF_T offset2;
 202         char *data;
 203         static char file_sum1[MD4_SUM_LENGTH];
 204         static char file_sum2[MD4_SUM_LENGTH];
 205         char *map=NULL;
 206
 207         read_sum_head(f_in, &sum);
 208
 209         sum_init();
 210
 211         while ((i = recv_token(f_in, &data)) != 0) {
 212                 if (do_progress)
 213                         show_progress(offset, total_size);
 214
 215                 if (i > 0) {
 216                         if (verbose > 3) {
 217                                 rprintf(FINFO,"data recv %d at %.0f\n",
 218                                         i,(double)offset);
 219                         }
 220
 221                         stats.literal_data += i;
 222                         cleanup_got_literal = 1;
 223
 224                         sum_update(data,i);
 225
 226                         if (fd != -1 && write_file(fd,data,i) != i) {
 227                                 rsyserr(FERROR, errno, "write failed on %s",
 228                                         full_fname(fname));
 229                                 exit_cleanup(RERR_FILEIO);
 230                         }
 231                         offset += i;
 232                         continue;
 233                 }
 234
 235                 i = -(i+1);
 236                 offset2 = i*(OFF_T)sum.blength;
 237                 len = sum.blength;
 238                 if (i == (int) sum.count-1 && sum.remainder != 0)
 239                         len = sum.remainder;
 240
 241                 stats.matched_data += len;
 242
 243                 if (verbose > 3)
 244                         rprintf(FINFO,"chunk[%d] of size %d at %.0f offset=%.0f\n",
 245                                 i,len,(double)offset2,(double)offset);
 246
 247                 if (mapbuf) {
 248                         map = map_ptr(mapbuf,offset2,len);
 249
 250                         see_token(map, len);
 251                         sum_update(map,len);
 252                 }
 253
 254                 if (fd != -1 && write_file(fd,map,len) != (int) len) {
 255                         rsyserr(FERROR, errno, "write failed on %s",
 256                                 full_fname(fname));
 257                         exit_cleanup(RERR_FILEIO);
 258                 }
 259                 offset += len;
 260         }
 261
 262         flush_write_file(fd);
 263
 264         if (do_progress)
 265                 end_progress(total_size);
 266
 267         if (fd != -1 && offset > 0 && sparse_end(fd) != 0) {
 268                 rsyserr(FERROR, errno, "write failed on %s",
 269                         full_fname(fname));
 270                 exit_cleanup(RERR_FILEIO);
 271         }
 272
 273         sum_end(file_sum1);
 274
 275         read_buf(f_in,file_sum2,MD4_SUM_LENGTH);
 276         if (verbose > 2) {
 277                 rprintf(FINFO,"got file_sum\n");
 278         }
 279         if (fd != -1 && memcmp(file_sum1,file_sum2,MD4_SUM_LENGTH) != 0) {
 280                 return 0;
 281         }
 282         return 1;
 283 }
 284
 285
 286 /**
 287  * main routine for receiver process.
 288  *
 289  * Receiver process runs on the same host as the generator process. */
 290 int recv_files(int f_in,struct file_list *flist,char *local_name)
 291 {
 292         int fd1,fd2;
 293         STRUCT_STAT st;
 294         char *fname, fbuf[MAXPATHLEN];
 295         char template[MAXPATHLEN];
 296         char fnametmp[MAXPATHLEN];
 297         char *fnamecmp;
 298         char fnamecmpbuf[MAXPATHLEN];
 299         struct map_struct *mapbuf;
 300         int i;
 301         struct file_struct *file;
 302         int phase=0;
 303         int recv_ok;
 304         struct stats initial_stats;
 305
 306         if (verbose > 2) {
 307                 rprintf(FINFO,"recv_files(%d) starting\n",flist->count);
 308         }
 309
 310         if (flist->hlink_pool) {
 311                 pool_destroy(flist->hlink_pool);
 312                 flist->hlink_pool = NULL;
 313         }
 314
 315         while (1) {
 316                 cleanup_disable();
 317
 318                 i = read_int(f_in);
 319                 if (i == -1) {
 320                         if (phase == 0) {
 321                                 phase++;
 322                                 csum_length = SUM_LENGTH;
 323                                 if (verbose > 2)
 324                                         rprintf(FINFO,"recv_files phase=%d\n",phase);
 325                                 send_msg(MSG_DONE, "", 0);
 326                                 continue;
 327                         }
 328                         break;
 329                 }
 330
 331                 if (i < 0 || i >= flist->count) {
 332                         rprintf(FERROR,"Invalid file index %d in recv_files (count=%d)\n",
 333                                 i, flist->count);
 334                         exit_cleanup(RERR_PROTOCOL);
 335                 }
 336
 337                 file = flist->files[i];
 338
 339                 stats.current_file_index = i;
 340                 stats.num_transferred_files++;
 341                 stats.total_transferred_size += file->length;
 342                 cleanup_got_literal = 0;
 343
 344                 if (local_name)
 345                         fname = local_name;
 346                 else
 347                         fname = f_name_to(file, fbuf);
 348
 349                 if (dry_run) {
 350                         if (!am_server && verbose) {    /* log transfer */
 351                                 rprintf(FINFO, "%s\n", fname);
 352                         }
 353                         continue;
 354                 }
 355
 356                 initial_stats = stats;
 357
 358                 if (verbose > 2)
 359                         rprintf(FINFO,"recv_files(%s)\n",fname);
 360
 361                 fnamecmp = fname;
 362
 363                 /* open the file */
 364                 fd1 = do_open(fnamecmp, O_RDONLY, 0);
 365
 366                 if (fd1 == -1 && compare_dest != NULL) {
 367                         /* try the file at compare_dest instead */
 368                         pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 369                                  compare_dest, fname);
 370                         fnamecmp = fnamecmpbuf;
 371                         fd1 = do_open(fnamecmp, O_RDONLY, 0);
 372                 }
 373
 374                 if (fd1 != -1 && do_fstat(fd1,&st) != 0) {
 375                         rsyserr(FERROR, errno, "fstat %s failed",
 376                                 full_fname(fnamecmp));
 377                         receive_data(f_in,NULL,-1,NULL,file->length);
 378                         close(fd1);
 379                         continue;
 380                 }
 381
 382                 if (fd1 != -1 && S_ISDIR(st.st_mode) && fnamecmp == fname) {
 383                         /* this special handling for directories
 384                          * wouldn't be necessary if robust_rename()
 385                          * and the underlying robust_unlink could cope
 386                          * with directories
 387                          */
 388                         rprintf(FERROR,"recv_files: %s is a directory\n",
 389                                 full_fname(fnamecmp));
 390                         receive_data(f_in, NULL, -1, NULL, file->length);
 391                         close(fd1);
 392                         continue;
 393                 }
 394
 395                 if (fd1 != -1 && !S_ISREG(st.st_mode)) {
 396                         close(fd1);
 397                         fd1 = -1;
 398                         mapbuf = NULL;
 399                 }
 400
 401                 if (fd1 != -1 && !preserve_perms) {
 402                         /* if the file exists already and we aren't preserving
 403                          * permissions then act as though the remote end sent
 404                          * us the file permissions we already have */
 405                         file->mode = st.st_mode;
 406                 }
 407
 408                 if (fd1 != -1 && st.st_size > 0) {
 409                         mapbuf = map_file(fd1,st.st_size);
 410                         if (verbose > 2)
 411                                 rprintf(FINFO,"recv mapped %s of size %.0f\n",fnamecmp,(double)st.st_size);
 412                 } else
 413                         mapbuf = NULL;
 414
 415                 if (!get_tmpname(fnametmp,fname)) {
 416                         if (mapbuf) unmap_file(mapbuf);
 417                         if (fd1 != -1) close(fd1);
 418                         continue;
 419                 }
 420
 421                 strlcpy(template, fnametmp, sizeof template);
 422
 423                 /* we initially set the perms without the
 424                  * setuid/setgid bits to ensure that there is no race
 425                  * condition. They are then correctly updated after
 426                  * the lchown. Thanks to snabb@epipe.fi for pointing
 427                  * this out.  We also set it initially without group
 428                  * access because of a similar race condition. */
 429                 fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 430
 431                 /* in most cases parent directories will already exist
 432                  * because their information should have been previously
 433                  * transferred, but that may not be the case with -R */
 434                 if (fd2 == -1 && relative_paths && errno == ENOENT &&
 435                     create_directory_path(fnametmp, orig_umask) == 0) {
 436                         strlcpy(fnametmp, template, sizeof fnametmp);
 437                         fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 438                 }
 439                 if (fd2 == -1) {
 440                         rsyserr(FERROR, errno, "mkstemp %s failed",
 441                                 full_fname(fnametmp));
 442                         receive_data(f_in,mapbuf,-1,NULL,file->length);
 443                         if (mapbuf) unmap_file(mapbuf);
 444                         if (fd1 != -1) close(fd1);
 445                         continue;
 446                 }
 447
 448                 cleanup_set(fnametmp, fname, file, mapbuf, fd1, fd2);
 449
 450                 if (!am_server && verbose) {    /* log transfer */
 451                         rprintf(FINFO, "%s\n", fname);
 452                 }
 453
 454                 /* recv file data */
 455                 recv_ok = receive_data(f_in,mapbuf,fd2,fname,file->length);
 456
 457                 log_recv(file, &initial_stats);
 458
 459                 if (mapbuf) unmap_file(mapbuf);
 460                 if (fd1 != -1) {
 461                         close(fd1);
 462                 }
 463                 if (close(fd2) < 0) {
 464                         rsyserr(FERROR, errno, "close failed on %s",
 465                                 full_fname(fnametmp));
 466                         exit_cleanup(RERR_FILEIO);
 467                 }
 468
 469                 if (verbose > 2)
 470                         rprintf(FINFO,"renaming %s to %s\n",fnametmp,fname);
 471
 472                 if (recv_ok || keep_partial)
 473                         finish_transfer(fname, fnametmp, file, recv_ok);
 474                 else
 475                         do_unlink(fnametmp);
 476
 477                 cleanup_disable();
 478
 479                 if (!recv_ok) {
 480                         if (csum_length == SUM_LENGTH) {
 481                                 rprintf(FERROR,"ERROR: file corruption in %s. File changed during transfer?\n",
 482                                         full_fname(fname));
 483                         } else {
 484                                 char buf[4];
 485                                 if (verbose > 1)
 486                                         rprintf(FINFO,"redoing %s(%d)\n",fname,i);
 487                                 SIVAL(buf, 0, i);
 488                                 send_msg(MSG_REDO, buf, 4);
 489                         }
 490                 }
 491         }
 492
 493         if (delete_after && recurse && delete_mode && !local_name
 494             && flist->count > 0)
 495                 delete_files(flist);
 496
 497         if (verbose > 2)
 498                 rprintf(FINFO,"recv_files finished\n");
 499
 500         return 0;
 501 }