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
  52 static void delete_one(char *fn, int is_dir)
  53 {
  54         if (!is_dir) {
  55                 if (robust_unlink(fn) != 0) {
  56                         rsyserr(FERROR, errno, "delete_one: unlink %s failed",
  57                                 full_fname(fn));
  58                 } else if (verbose)
  59                         rprintf(FINFO, "deleting %s\n", fn);
  60         } else {
  61                 if (do_rmdir(fn) != 0) {
  62                         if (errno == ENOTDIR && keep_dirlinks) {
  63                                 delete_one(fn, 0);
  64                                 return;
  65                         }
  66                         if (errno != ENOTEMPTY && errno != EEXIST) {
  67                                 rsyserr(FERROR, errno,
  68                                         "delete_one: rmdir %s failed",
  69                                         full_fname(fn));
  70                         }
  71                 } else if (verbose)
  72                         rprintf(FINFO, "deleting directory %s\n", fn);
  73         }
  74 }
  75
  76
  77 static int is_backup_file(char *fn)
  78 {
  79         int k = strlen(fn) - backup_suffix_len;
  80         return k > 0 && strcmp(fn+k, backup_suffix) == 0;
  81 }
  82
  83
  84 /* This deletes any files on the receiving side that are not present
  85  * on the sending side. */
  86 void delete_files(struct file_list *flist)
  87 {
  88         struct file_list *local_file_list;
  89         int i, j;
  90         char *argv[1], fbuf[MAXPATHLEN];
  91         static int deletion_count;
  92
  93         if (cvs_exclude)
  94                 add_cvs_excludes();
  95
  96         if (io_error && !(lp_ignore_errors(module_id) || ignore_errors)) {
  97                 rprintf(FINFO,"IO error encountered - skipping file deletion\n");
  98                 return;
  99         }
 100
 101         for (j = 0; j < flist->count; j++) {
 102                 if (!(flist->files[j]->flags & FLAG_TOP_DIR)
 103                     || !S_ISDIR(flist->files[j]->mode))
 104                         continue;
 105
 106                 argv[0] = f_name_to(flist->files[j], fbuf);
 107
 108                 if (!(local_file_list = send_file_list(-1, 1, argv)))
 109                         continue;
 110
 111                 if (verbose > 1)
 112                         rprintf(FINFO, "deleting in %s\n", fbuf);
 113
 114                 for (i = local_file_list->count-1; i >= 0; i--) {
 115                         if (max_delete && deletion_count > max_delete)
 116                                 break;
 117                         if (!local_file_list->files[i]->basename)
 118                                 continue;
 119                         if (flist_find(flist,local_file_list->files[i]) < 0) {
 120                                 char *f = f_name(local_file_list->files[i]);
 121                                 if (make_backups && (backup_dir || !is_backup_file(f))) {
 122                                         make_backup(f);
 123                                         if (verbose)
 124                                                 rprintf(FINFO, "deleting %s\n", f);
 125                                 } else {
 126                                         int mode = local_file_list->files[i]->mode;
 127                                         delete_one(f, S_ISDIR(mode) != 0);
 128                                 }
 129                                 deletion_count++;
 130                         }
 131                 }
 132                 flist_free(local_file_list);
 133         }
 134 }
 135
 136
 137 /*
 138  * get_tmpname() - create a tmp filename for a given filename
 139  *
 140  *   If a tmpdir is defined, use that as the directory to
 141  *   put it in.  Otherwise, the tmp filename is in the same
 142  *   directory as the given name.  Note that there may be no
 143  *   directory at all in the given name!
 144  *
 145  *   The tmp filename is basically the given filename with a
 146  *   dot prepended, and .XXXXXX appended (for mkstemp() to
 147  *   put its unique gunk in).  Take care to not exceed
 148  *   either the MAXPATHLEN or NAME_MAX, esp. the last, as
 149  *   the basename basically becomes 8 chars longer. In that
 150  *   case, the original name is shortened sufficiently to
 151  *   make it all fit.
 152  *
 153  *   Of course, there's no real reason for the tmp name to
 154  *   look like the original, except to satisfy us humans.
 155  *   As long as it's unique, rsync will work.
 156  */
 157
 158 static int get_tmpname(char *fnametmp, char *fname)
 159 {
 160         char *f;
 161         int     length = 0;
 162         int     maxname;
 163
 164         if (tmpdir) {
 165                 /* Note: this can't overflow, so the return value is safe */
 166                 length = strlcpy(fnametmp, tmpdir, MAXPATHLEN - 2);
 167                 fnametmp[length++] = '/';
 168                 fnametmp[length] = '\0';        /* always NULL terminated */
 169         }
 170
 171         if ((f = strrchr(fname, '/')) != NULL) {
 172                 ++f;
 173                 if (!tmpdir) {
 174                         length = f - fname;
 175                         /* copy up to and including the slash */
 176                         strlcpy(fnametmp, fname, length + 1);
 177                 }
 178         } else
 179                 f = fname;
 180         fnametmp[length++] = '.';
 181         fnametmp[length] = '\0';                /* always NULL terminated */
 182
 183         maxname = MIN(MAXPATHLEN - 7 - length, NAME_MAX - 8);
 184
 185         if (maxname < 1) {
 186                 rprintf(FERROR, "temporary filename too long: %s\n", fname);
 187                 fnametmp[0] = '\0';
 188                 return 0;
 189         }
 190
 191         strlcpy(fnametmp + length, f, maxname);
 192         strcat(fnametmp + length, ".XXXXXX");
 193
 194         return 1;
 195 }
 196
 197
 198 static int receive_data(int f_in,struct map_struct *mapbuf,int fd,char *fname,
 199                         OFF_T total_size)
 200 {
 201         int i;
 202         struct sum_struct sum;
 203         unsigned int len;
 204         OFF_T offset = 0;
 205         OFF_T offset2;
 206         char *data;
 207         static char file_sum1[MD4_SUM_LENGTH];
 208         static char file_sum2[MD4_SUM_LENGTH];
 209         char *map = NULL;
 210
 211         read_sum_head(f_in, &sum);
 212
 213         sum_init(checksum_seed);
 214
 215         while ((i = recv_token(f_in, &data)) != 0) {
 216                 if (do_progress)
 217                         show_progress(offset, total_size);
 218
 219                 if (i > 0) {
 220                         if (verbose > 3) {
 221                                 rprintf(FINFO,"data recv %d at %.0f\n",
 222                                         i,(double)offset);
 223                         }
 224
 225                         stats.literal_data += i;
 226                         cleanup_got_literal = 1;
 227
 228                         sum_update(data,i);
 229
 230                         if (fd != -1 && write_file(fd,data,i) != i) {
 231                                 rsyserr(FERROR, errno, "write failed on %s",
 232                                         full_fname(fname));
 233                                 exit_cleanup(RERR_FILEIO);
 234                         }
 235                         offset += i;
 236                         continue;
 237                 }
 238
 239                 i = -(i+1);
 240                 offset2 = i*(OFF_T)sum.blength;
 241                 len = sum.blength;
 242                 if (i == (int)sum.count-1 && sum.remainder != 0)
 243                         len = sum.remainder;
 244
 245                 stats.matched_data += len;
 246
 247                 if (verbose > 3)
 248                         rprintf(FINFO,"chunk[%d] of size %d at %.0f offset=%.0f\n",
 249                                 i,len,(double)offset2,(double)offset);
 250
 251                 if (mapbuf) {
 252                         map = map_ptr(mapbuf,offset2,len);
 253
 254                         see_token(map, len);
 255                         sum_update(map,len);
 256                 }
 257
 258                 if (fd != -1 && write_file(fd, map, len) != (int)len) {
 259                         rsyserr(FERROR, errno, "write failed on %s",
 260                                 full_fname(fname));
 261                         exit_cleanup(RERR_FILEIO);
 262                 }
 263                 offset += len;
 264         }
 265
 266         flush_write_file(fd);
 267
 268         if (do_progress)
 269                 end_progress(total_size);
 270
 271         if (fd != -1 && offset > 0 && sparse_end(fd) != 0) {
 272                 rsyserr(FERROR, errno, "write failed on %s",
 273                         full_fname(fname));
 274                 exit_cleanup(RERR_FILEIO);
 275         }
 276
 277         sum_end(file_sum1);
 278
 279         read_buf(f_in,file_sum2,MD4_SUM_LENGTH);
 280         if (verbose > 2)
 281                 rprintf(FINFO,"got file_sum\n");
 282         if (fd != -1 && memcmp(file_sum1, file_sum2, MD4_SUM_LENGTH) != 0)
 283                 return 0;
 284         return 1;
 285 }
 286
 287
 288 /**
 289  * main routine for receiver process.
 290  *
 291  * Receiver process runs on the same host as the generator process. */
 292 int recv_files(int f_in, struct file_list *flist, char *local_name)
 293 {
 294         int fd1,fd2;
 295         STRUCT_STAT st;
 296         char *fname, fbuf[MAXPATHLEN];
 297         char template[MAXPATHLEN];
 298         char fnametmp[MAXPATHLEN];
 299         char *fnamecmp;
 300         char fnamecmpbuf[MAXPATHLEN];
 301         struct map_struct *mapbuf;
 302         struct file_struct *file;
 303         struct stats initial_stats;
 304         int save_make_backups = make_backups;
 305         int i, recv_ok, phase = 0;
 306
 307         if (verbose > 2)
 308                 rprintf(FINFO,"recv_files(%d) starting\n",flist->count);
 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)
 321                                 break;
 322                         phase = 1;
 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                         if (keep_partial)
 328                                 make_backups = 0; /* prevents double backup */
 329                         continue;
 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)
 352                                 rprintf(FINFO, "%s\n", fname);
 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",
 412                                         fnamecmp, (double)st.st_size);
 413                         }
 414                 } else
 415                         mapbuf = NULL;
 416
 417                 if (!get_tmpname(fnametmp,fname)) {
 418                         if (mapbuf)
 419                                 unmap_file(mapbuf);
 420                         if (fd1 != -1)
 421                                 close(fd1);
 422                         continue;
 423                 }
 424
 425                 strlcpy(template, fnametmp, sizeof template);
 426
 427                 /* we initially set the perms without the
 428                  * setuid/setgid bits to ensure that there is no race
 429                  * condition. They are then correctly updated after
 430                  * the lchown. Thanks to snabb@epipe.fi for pointing
 431                  * this out.  We also set it initially without group
 432                  * access because of a similar race condition. */
 433                 fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 434
 435                 /* in most cases parent directories will already exist
 436                  * because their information should have been previously
 437                  * transferred, but that may not be the case with -R */
 438                 if (fd2 == -1 && relative_paths && errno == ENOENT &&
 439                     create_directory_path(fnametmp, orig_umask) == 0) {
 440                         strlcpy(fnametmp, template, sizeof fnametmp);
 441                         fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 442                 }
 443                 if (fd2 == -1) {
 444                         rsyserr(FERROR, errno, "mkstemp %s failed",
 445                                 full_fname(fnametmp));
 446                         receive_data(f_in,mapbuf,-1,NULL,file->length);
 447                         if (mapbuf)
 448                                 unmap_file(mapbuf);
 449                         if (fd1 != -1)
 450                                 close(fd1);
 451                         continue;
 452                 }
 453
 454                 cleanup_set(fnametmp, fname, file, mapbuf, fd1, fd2);
 455
 456                 if (!am_server && verbose)
 457                         rprintf(FINFO, "%s\n", fname);
 458
 459                 /* recv file data */
 460                 recv_ok = receive_data(f_in,mapbuf,fd2,fname,file->length);
 461
 462                 log_recv(file, &initial_stats);
 463
 464                 if (mapbuf)
 465                         unmap_file(mapbuf);
 466                 if (fd1 != -1)
 467                         close(fd1);
 468                 if (close(fd2) < 0) {
 469                         rsyserr(FERROR, errno, "close failed on %s",
 470                                 full_fname(fnametmp));
 471                         exit_cleanup(RERR_FILEIO);
 472                 }
 473
 474                 if (recv_ok || keep_partial)
 475                         finish_transfer(fname, fnametmp, file, recv_ok);
 476                 else
 477                         do_unlink(fnametmp);
 478
 479                 cleanup_disable();
 480
 481                 if (!recv_ok) {
 482                         if (csum_length == SUM_LENGTH) {
 483                                 rprintf(FERROR,"ERROR: file corruption in %s. File changed during transfer?\n",
 484                                         full_fname(fname));
 485                         } else {
 486                                 char buf[4];
 487                                 if (verbose > 1)
 488                                         rprintf(FINFO,"redoing %s(%d)\n",fname,i);
 489                                 SIVAL(buf, 0, i);
 490                                 send_msg(MSG_REDO, buf, 4);
 491                         }
 492                 }
 493         }
 494         make_backups = save_make_backups;
 495
 496         if (delete_after && recurse && delete_mode && !local_name
 497             && flist->count > 0)
 498                 delete_files(flist);
 499
 500         if (verbose > 2)
 501                 rprintf(FINFO,"recv_files finished\n");
 502
 503         return 0;
 504 }