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 extern int checksum_seed;
  50
  51 static void delete_one(char *fn, int is_dir)
  52 {
  53         if (!is_dir) {
  54                 if (robust_unlink(fn) != 0) {
  55                         rsyserr(FERROR, errno, "delete_one: unlink %s failed",
  56                                 full_fname(fn));
  57                 } else if (verbose) {
  58                         rprintf(FINFO, "deleting %s\n", fn);
  59                 }
  60         } else {
  61                 if (do_rmdir(fn) != 0) {
  62                         if (errno != ENOTEMPTY && errno != EEXIST) {
  63                                 rsyserr(FERROR, errno,
  64                                         "delete_one: rmdir %s failed",
  65                                         full_fname(fn));
  66                         }
  67                 } else if (verbose) {
  68                         rprintf(FINFO, "deleting directory %s\n", fn);
  69                 }
  70         }
  71 }
  72
  73
  74 static int is_backup_file(char *fn)
  75 {
  76         int k = strlen(fn) - backup_suffix_len;
  77         return k > 0 && strcmp(fn+k, backup_suffix) == 0;
  78 }
  79
  80
  81 /* This deletes any files on the receiving side that are not present
  82  * on the sending side. */
  83 void delete_files(struct file_list *flist)
  84 {
  85         struct file_list *local_file_list;
  86         int i, j;
  87         char *argv[1], fbuf[MAXPATHLEN];
  88         static int deletion_count;
  89
  90         if (cvs_exclude)
  91                 add_cvs_excludes();
  92
  93         if (io_error && !(lp_ignore_errors(module_id) || ignore_errors)) {
  94                 rprintf(FINFO,"IO error encountered - skipping file deletion\n");
  95                 return;
  96         }
  97
  98         for (j = 0; j < flist->count; j++) {
  99                 if (!(flist->files[j]->flags & FLAG_TOP_DIR)
 100                     || !S_ISDIR(flist->files[j]->mode))
 101                         continue;
 102
 103                 argv[0] = f_name_to(flist->files[j], fbuf);
 104
 105                 if (!(local_file_list = send_file_list(-1, 1, argv)))
 106                         continue;
 107
 108                 if (verbose > 1)
 109                         rprintf(FINFO, "deleting in %s\n", fbuf);
 110
 111                 for (i = local_file_list->count-1; i >= 0; i--) {
 112                         if (max_delete && deletion_count > max_delete)
 113                                 break;
 114                         if (!local_file_list->files[i]->basename)
 115                                 continue;
 116                         if (flist_find(flist,local_file_list->files[i]) < 0) {
 117                                 char *f = f_name(local_file_list->files[i]);
 118                                 if (make_backups && (backup_dir || !is_backup_file(f))) {
 119                                         (void) make_backup(f);
 120                                         if (verbose)
 121                                                 rprintf(FINFO, "deleting %s\n", f);
 122                                 } else {
 123                                         int mode = local_file_list->files[i]->mode;
 124                                         delete_one(f, S_ISDIR(mode) != 0);
 125                                 }
 126                                 deletion_count++;
 127                         }
 128                 }
 129                 flist_free(local_file_list);
 130         }
 131 }
 132
 133
 134 /*
 135  * get_tmpname() - create a tmp filename for a given filename
 136  *
 137  *   If a tmpdir is defined, use that as the directory to
 138  *   put it in.  Otherwise, the tmp filename is in the same
 139  *   directory as the given name.  Note that there may be no
 140  *   directory at all in the given name!
 141  *
 142  *   The tmp filename is basically the given filename with a
 143  *   dot prepended, and .XXXXXX appended (for mkstemp() to
 144  *   put its unique gunk in).  Take care to not exceed
 145  *   either the MAXPATHLEN or NAME_MAX, esp. the last, as
 146  *   the basename basically becomes 8 chars longer. In that
 147  *   case, the original name is shortened sufficiently to
 148  *   make it all fit.
 149  *
 150  *   Of course, there's no real reason for the tmp name to
 151  *   look like the original, except to satisfy us humans.
 152  *   As long as it's unique, rsync will work.
 153  */
 154
 155 static int get_tmpname(char *fnametmp, char *fname)
 156 {
 157         char *f;
 158         int     length = 0;
 159         int     maxname;
 160
 161         if (tmpdir) {
 162                 /* Note: this can't overflow, so the return value is safe */
 163                 length = strlcpy(fnametmp, tmpdir, MAXPATHLEN - 2);
 164                 fnametmp[length++] = '/';
 165                 fnametmp[length] = '\0';        /* always NULL terminated */
 166         }
 167
 168         if ((f = strrchr(fname, '/')) != NULL) {
 169                 ++f;
 170                 if (!tmpdir) {
 171                         length = f - fname;
 172                         /* copy up to and including the slash */
 173                         strlcpy(fnametmp, fname, length + 1);
 174                 }
 175         } else
 176                 f = fname;
 177         fnametmp[length++] = '.';
 178         fnametmp[length] = '\0';                /* always NULL terminated */
 179
 180         maxname = MIN(MAXPATHLEN - 7 - length, NAME_MAX - 8);
 181
 182         if (maxname < 1) {
 183                 rprintf(FERROR, "temporary filename too long: %s\n", fname);
 184                 fnametmp[0] = '\0';
 185                 return 0;
 186         }
 187
 188         strlcpy(fnametmp + length, f, maxname);
 189         strcat(fnametmp + length, ".XXXXXX");
 190
 191         return 1;
 192 }
 193
 194
 195 static int receive_data(int f_in,struct map_struct *mapbuf,int fd,char *fname,
 196                         OFF_T total_size)
 197 {
 198         int i;
 199         struct sum_struct sum;
 200         unsigned int len;
 201         OFF_T offset = 0;
 202         OFF_T offset2;
 203         char *data;
 204         static char file_sum1[MD4_SUM_LENGTH];
 205         static char file_sum2[MD4_SUM_LENGTH];
 206         char *map=NULL;
 207
 208         read_sum_head(f_in, &sum);
 209
 210         sum_init(checksum_seed);
 211
 212         while ((i = recv_token(f_in, &data)) != 0) {
 213                 if (do_progress)
 214                         show_progress(offset, total_size);
 215
 216                 if (i > 0) {
 217                         if (verbose > 3) {
 218                                 rprintf(FINFO,"data recv %d at %.0f\n",
 219                                         i,(double)offset);
 220                         }
 221
 222                         stats.literal_data += i;
 223                         cleanup_got_literal = 1;
 224
 225                         sum_update(data,i);
 226
 227                         if (fd != -1 && write_file(fd,data,i) != i) {
 228                                 rsyserr(FERROR, errno, "write failed on %s",
 229                                         full_fname(fname));
 230                                 exit_cleanup(RERR_FILEIO);
 231                         }
 232                         offset += i;
 233                         continue;
 234                 }
 235
 236                 i = -(i+1);
 237                 offset2 = i*(OFF_T)sum.blength;
 238                 len = sum.blength;
 239                 if (i == (int) sum.count-1 && sum.remainder != 0)
 240                         len = sum.remainder;
 241
 242                 stats.matched_data += len;
 243
 244                 if (verbose > 3)
 245                         rprintf(FINFO,"chunk[%d] of size %d at %.0f offset=%.0f\n",
 246                                 i,len,(double)offset2,(double)offset);
 247
 248                 if (mapbuf) {
 249                         map = map_ptr(mapbuf,offset2,len);
 250
 251                         see_token(map, len);
 252                         sum_update(map,len);
 253                 }
 254
 255                 if (fd != -1 && write_file(fd,map,len) != (int) len) {
 256                         rsyserr(FERROR, errno, "write failed on %s",
 257                                 full_fname(fname));
 258                         exit_cleanup(RERR_FILEIO);
 259                 }
 260                 offset += len;
 261         }
 262
 263         flush_write_file(fd);
 264
 265         if (do_progress)
 266                 end_progress(total_size);
 267
 268         if (fd != -1 && offset > 0 && sparse_end(fd) != 0) {
 269                 rsyserr(FERROR, errno, "write failed on %s",
 270                         full_fname(fname));
 271                 exit_cleanup(RERR_FILEIO);
 272         }
 273
 274         sum_end(file_sum1);
 275
 276         read_buf(f_in,file_sum2,MD4_SUM_LENGTH);
 277         if (verbose > 2) {
 278                 rprintf(FINFO,"got file_sum\n");
 279         }
 280         if (fd != -1 && memcmp(file_sum1,file_sum2,MD4_SUM_LENGTH) != 0) {
 281                 return 0;
 282         }
 283         return 1;
 284 }
 285
 286
 287 /**
 288  * main routine for receiver process.
 289  *
 290  * Receiver process runs on the same host as the generator process. */
 291 int recv_files(int f_in,struct file_list *flist,char *local_name)
 292 {
 293         int fd1,fd2;
 294         STRUCT_STAT st;
 295         char *fname, fbuf[MAXPATHLEN];
 296         char template[MAXPATHLEN];
 297         char fnametmp[MAXPATHLEN];
 298         char *fnamecmp;
 299         char fnamecmpbuf[MAXPATHLEN];
 300         struct map_struct *mapbuf;
 301         int i;
 302         struct file_struct *file;
 303         int phase=0;
 304         int recv_ok;
 305         struct stats initial_stats;
 306
 307         if (verbose > 2) {
 308                 rprintf(FINFO,"recv_files(%d) starting\n",flist->count);
 309         }
 310
 311         if (flist->hlink_pool) {
 312                 pool_destroy(flist->hlink_pool);
 313                 flist->hlink_pool = NULL;
 314         }
 315
 316         while (1) {
 317                 cleanup_disable();
 318
 319                 i = read_int(f_in);
 320                 if (i == -1) {
 321                         if (phase == 0) {
 322                                 phase++;
 323                                 csum_length = SUM_LENGTH;
 324                                 if (verbose > 2)
 325                                         rprintf(FINFO,"recv_files phase=%d\n",phase);
 326                                 send_msg(MSG_DONE, "", 0);
 327                                 continue;
 328                         }
 329                         break;
 330                 }
 331
 332                 if (i < 0 || i >= flist->count) {
 333                         rprintf(FERROR,"Invalid file index %d in recv_files (count=%d)\n",
 334                                 i, flist->count);
 335                         exit_cleanup(RERR_PROTOCOL);
 336                 }
 337
 338                 file = flist->files[i];
 339
 340                 stats.current_file_index = i;
 341                 stats.num_transferred_files++;
 342                 stats.total_transferred_size += file->length;
 343                 cleanup_got_literal = 0;
 344
 345                 if (local_name)
 346                         fname = local_name;
 347                 else
 348                         fname = f_name_to(file, fbuf);
 349
 350                 if (dry_run) {
 351                         if (!am_server && verbose) {    /* log transfer */
 352                                 rprintf(FINFO, "%s\n", fname);
 353                         }
 354                         continue;
 355                 }
 356
 357                 initial_stats = stats;
 358
 359                 if (verbose > 2)
 360                         rprintf(FINFO,"recv_files(%s)\n",fname);
 361
 362                 fnamecmp = fname;
 363
 364                 /* open the file */
 365                 fd1 = do_open(fnamecmp, O_RDONLY, 0);
 366
 367                 if (fd1 == -1 && compare_dest != NULL) {
 368                         /* try the file at compare_dest instead */
 369                         pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 370                                  compare_dest, fname);
 371                         fnamecmp = fnamecmpbuf;
 372                         fd1 = do_open(fnamecmp, O_RDONLY, 0);
 373                 }
 374
 375                 if (fd1 != -1 && do_fstat(fd1,&st) != 0) {
 376                         rsyserr(FERROR, errno, "fstat %s failed",
 377                                 full_fname(fnamecmp));
 378                         receive_data(f_in,NULL,-1,NULL,file->length);
 379                         close(fd1);
 380                         continue;
 381                 }
 382
 383                 if (fd1 != -1 && S_ISDIR(st.st_mode) && fnamecmp == fname) {
 384                         /* this special handling for directories
 385                          * wouldn't be necessary if robust_rename()
 386                          * and the underlying robust_unlink could cope
 387                          * with directories
 388                          */
 389                         rprintf(FERROR,"recv_files: %s is a directory\n",
 390                                 full_fname(fnamecmp));
 391                         receive_data(f_in, NULL, -1, NULL, file->length);
 392                         close(fd1);
 393                         continue;
 394                 }
 395
 396                 if (fd1 != -1 && !S_ISREG(st.st_mode)) {
 397                         close(fd1);
 398                         fd1 = -1;
 399                         mapbuf = NULL;
 400                 }
 401
 402                 if (fd1 != -1 && !preserve_perms) {
 403                         /* if the file exists already and we aren't preserving
 404                          * permissions then act as though the remote end sent
 405                          * us the file permissions we already have */
 406                         file->mode = st.st_mode;
 407                 }
 408
 409                 if (fd1 != -1 && st.st_size > 0) {
 410                         mapbuf = map_file(fd1,st.st_size);
 411                         if (verbose > 2)
 412                                 rprintf(FINFO,"recv mapped %s of size %.0f\n",fnamecmp,(double)st.st_size);
 413                 } else
 414                         mapbuf = NULL;
 415
 416                 if (!get_tmpname(fnametmp,fname)) {
 417                         if (mapbuf) unmap_file(mapbuf);
 418                         if (fd1 != -1) close(fd1);
 419                         continue;
 420                 }
 421
 422                 strlcpy(template, fnametmp, sizeof template);
 423
 424                 /* we initially set the perms without the
 425                  * setuid/setgid bits to ensure that there is no race
 426                  * condition. They are then correctly updated after
 427                  * the lchown. Thanks to snabb@epipe.fi for pointing
 428                  * this out.  We also set it initially without group
 429                  * access because of a similar race condition. */
 430                 fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 431
 432                 /* in most cases parent directories will already exist
 433                  * because their information should have been previously
 434                  * transferred, but that may not be the case with -R */
 435                 if (fd2 == -1 && relative_paths && errno == ENOENT &&
 436                     create_directory_path(fnametmp, orig_umask) == 0) {
 437                         strlcpy(fnametmp, template, sizeof fnametmp);
 438                         fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 439                 }
 440                 if (fd2 == -1) {
 441                         rsyserr(FERROR, errno, "mkstemp %s failed",
 442                                 full_fname(fnametmp));
 443                         receive_data(f_in,mapbuf,-1,NULL,file->length);
 444                         if (mapbuf) unmap_file(mapbuf);
 445                         if (fd1 != -1) close(fd1);
 446                         continue;
 447                 }
 448
 449                 cleanup_set(fnametmp, fname, file, mapbuf, fd1, fd2);
 450
 451                 if (!am_server && verbose) {    /* log transfer */
 452                         rprintf(FINFO, "%s\n", fname);
 453                 }
 454
 455                 /* recv file data */
 456                 recv_ok = receive_data(f_in,mapbuf,fd2,fname,file->length);
 457
 458                 log_recv(file, &initial_stats);
 459
 460                 if (mapbuf) unmap_file(mapbuf);
 461                 if (fd1 != -1) {
 462                         close(fd1);
 463                 }
 464                 if (close(fd2) < 0) {
 465                         rsyserr(FERROR, errno, "close failed on %s",
 466                                 full_fname(fnametmp));
 467                         exit_cleanup(RERR_FILEIO);
 468                 }
 469
 470                 if (verbose > 2)
 471                         rprintf(FINFO,"renaming %s to %s\n",fnametmp,fname);
 472
 473                 if (recv_ok || keep_partial)
 474                         finish_transfer(fname, fnametmp, file, recv_ok);
 475                 else
 476                         do_unlink(fnametmp);
 477
 478                 cleanup_disable();
 479
 480                 if (!recv_ok) {
 481                         if (csum_length == SUM_LENGTH) {
 482                                 rprintf(FERROR,"ERROR: file corruption in %s. File changed during transfer?\n",
 483                                         full_fname(fname));
 484                         } else {
 485                                 char buf[4];
 486                                 if (verbose > 1)
 487                                         rprintf(FINFO,"redoing %s(%d)\n",fname,i);
 488                                 SIVAL(buf, 0, i);
 489                                 send_msg(MSG_REDO, buf, 4);
 490                         }
 491                 }
 492         }
 493
 494         if (delete_after && recurse && delete_mode && !local_name
 495             && flist->count > 0)
 496                 delete_files(flist);
 497
 498         if (verbose > 2)
 499                 rprintf(FINFO,"recv_files finished\n");
 500
 501         return 0;
 502 }