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