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