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 csum_length;
  27 extern struct stats stats;
  28 extern int dry_run;
  29 extern int am_server;
  30 extern int relative_paths;
  31 extern int preserve_hard_links;
  32 extern int cvs_exclude;
  33 extern int io_error;
  34 extern char *tmpdir;
  35 extern char *compare_dest;
  36 extern int make_backups;
  37 extern int do_progress;
  38 extern char *backup_dir;
  39 extern char *backup_suffix;
  40 extern int backup_suffix_len;
  41 extern int cleanup_got_literal;
  42
  43 static void delete_one(char *fn, int is_dir)
  44 {
  45         if (!is_dir) {
  46                 if (robust_unlink(fn) != 0) {
  47                         rprintf(FERROR, "delete_one: unlink %s failed: %s\n",
  48                                 full_fname(fn), strerror(errno));
  49                 } else if (verbose) {
  50                         rprintf(FINFO, "deleting %s\n", fn);
  51                 }
  52         } else {
  53                 if (do_rmdir(fn) != 0) {
  54                         if (errno != ENOTEMPTY && errno != EEXIST) {
  55                                 rprintf(FERROR, "delete_one: rmdir %s failed: %s\n",
  56                                         full_fname(fn), strerror(errno));
  57                         }
  58                 } else if (verbose) {
  59                         rprintf(FINFO, "deleting directory %s\n", fn);
  60                 }
  61         }
  62 }
  63
  64
  65 static int is_backup_file(char *fn)
  66 {
  67         int k = strlen(fn) - backup_suffix_len;
  68         return k > 0 && strcmp(fn+k, backup_suffix) == 0;
  69 }
  70
  71
  72 /* this deletes any files on the receiving side that are not present
  73  * on the sending side. For version 1.6.4 I have changed the behaviour
  74  * to match more closely what most people seem to expect of this option */
  75 void delete_files(struct file_list *flist)
  76 {
  77         struct file_list *local_file_list;
  78         int i, j;
  79         char *argv[1], fbuf[MAXPATHLEN];
  80         extern int module_id;
  81         extern int ignore_errors;
  82         extern int max_delete;
  83         static int deletion_count;
  84
  85         if (cvs_exclude)
  86                 add_cvs_excludes();
  87
  88         if (io_error && !(lp_ignore_errors(module_id) || ignore_errors)) {
  89                 rprintf(FINFO,"IO error encountered - skipping file deletion\n");
  90                 return;
  91         }
  92
  93         for (j = 0;j < flist->count; j++) {
  94                 if (!(flist->files[j]->flags & FLAG_TOP_DIR)
  95                     || !S_ISDIR(flist->files[j]->mode))
  96                         continue;
  97
  98                 argv[0] = f_name_to(flist->files[j], fbuf);
  99
 100                 if (!(local_file_list = send_file_list(-1, 1, argv)))
 101                         continue;
 102
 103                 if (verbose > 1)
 104                         rprintf(FINFO,"deleting in %s\n", fbuf);
 105
 106                 for (i = local_file_list->count-1; i >= 0; i--) {
 107                         if (max_delete && deletion_count > max_delete) break;
 108                         if (!local_file_list->files[i]->basename) continue;
 109                         if (-1 == flist_find(flist,local_file_list->files[i])) {
 110                                 char *f = f_name(local_file_list->files[i]);
 111                                 if (make_backups && (backup_dir || !is_backup_file(f))) {
 112                                         (void) make_backup(f);
 113                                         if (verbose)
 114                                                 rprintf(FINFO, "deleting %s\n", f);
 115                                 } else {
 116                                         int mode = local_file_list->files[i]->mode;
 117                                         delete_one(f, S_ISDIR(mode) != 0);
 118                                 }
 119                                 deletion_count++;
 120                         }
 121                 }
 122                 flist_free(local_file_list);
 123         }
 124 }
 125
 126
 127 /*
 128  * get_tmpname() - create a tmp filename for a given filename
 129  *
 130  *   If a tmpdir is defined, use that as the directory to
 131  *   put it in.  Otherwise, the tmp filename is in the same
 132  *   directory as the given name.  Note that there may be no
 133  *   directory at all in the given name!
 134  *
 135  *   The tmp filename is basically the given filename with a
 136  *   dot prepended, and .XXXXXX appended (for mkstemp() to
 137  *   put its unique gunk in).  Take care to not exceed
 138  *   either the MAXPATHLEN or NAME_MAX, esp. the last, as
 139  *   the basename basically becomes 8 chars longer. In that
 140  *   case, the original name is shortened sufficiently to
 141  *   make it all fit.
 142  *
 143  *   Of course, there's no real reason for the tmp name to
 144  *   look like the original, except to satisfy us humans.
 145  *   As long as it's unique, rsync will work.
 146  */
 147
 148 static int get_tmpname(char *fnametmp, char *fname)
 149 {
 150         char *f;
 151         int     length = 0;
 152         int     maxname;
 153
 154         if (tmpdir) {
 155                 /* Note: this can't overflow, so the return value is safe */
 156                 length = strlcpy(fnametmp, tmpdir, MAXPATHLEN - 2);
 157                 fnametmp[length++] = '/';
 158                 fnametmp[length] = '\0';        /* always NULL terminated */
 159         }
 160
 161         if ((f = strrchr(fname, '/')) != NULL) {
 162                 ++f;
 163                 if (!tmpdir) {
 164                         length = f - fname;
 165                         /* copy up to and including the slash */
 166                         strlcpy(fnametmp, fname, length + 1);
 167                 }
 168         } else
 169                 f = fname;
 170         fnametmp[length++] = '.';
 171         fnametmp[length] = '\0';                /* always NULL terminated */
 172
 173         maxname = MIN(MAXPATHLEN - 7 - length, NAME_MAX - 8);
 174
 175         if (maxname < 1) {
 176                 rprintf(FERROR, "temporary filename too long: %s\n", fname);
 177                 fnametmp[0] = '\0';
 178                 return 0;
 179         }
 180
 181         strlcpy(fnametmp + length, f, maxname);
 182         strcat(fnametmp + length, ".XXXXXX");
 183
 184         return 1;
 185 }
 186
 187
 188 static int receive_data(int f_in,struct map_struct *mapbuf,int fd,char *fname,
 189                         OFF_T total_size)
 190 {
 191         int i;
 192         struct sum_struct sum;
 193         unsigned int len;
 194         OFF_T offset = 0;
 195         OFF_T offset2;
 196         char *data;
 197         static char file_sum1[MD4_SUM_LENGTH];
 198         static char file_sum2[MD4_SUM_LENGTH];
 199         char *map=NULL;
 200
 201         read_sum_head(f_in, &sum);
 202
 203         sum_init();
 204
 205         while ((i = recv_token(f_in, &data)) != 0) {
 206                 if (do_progress)
 207                         show_progress(offset, total_size);
 208
 209                 if (i > 0) {
 210                         if (verbose > 3) {
 211                                 rprintf(FINFO,"data recv %d at %.0f\n",
 212                                         i,(double)offset);
 213                         }
 214
 215                         stats.literal_data += i;
 216                         cleanup_got_literal = 1;
 217
 218                         sum_update(data,i);
 219
 220                         if (fd != -1 && write_file(fd,data,i) != i) {
 221                                 rprintf(FERROR, "write failed on %s: %s\n",
 222                                         full_fname(fname), strerror(errno));
 223                                 exit_cleanup(RERR_FILEIO);
 224                         }
 225                         offset += i;
 226                         continue;
 227                 }
 228
 229                 i = -(i+1);
 230                 offset2 = i*(OFF_T)sum.blength;
 231                 len = sum.blength;
 232                 if (i == (int) sum.count-1 && sum.remainder != 0)
 233                         len = sum.remainder;
 234
 235                 stats.matched_data += len;
 236
 237                 if (verbose > 3)
 238                         rprintf(FINFO,"chunk[%d] of size %d at %.0f offset=%.0f\n",
 239                                 i,len,(double)offset2,(double)offset);
 240
 241                 if (mapbuf) {
 242                         map = map_ptr(mapbuf,offset2,len);
 243
 244                         see_token(map, len);
 245                         sum_update(map,len);
 246                 }
 247
 248                 if (fd != -1 && write_file(fd,map,len) != (int) len) {
 249                         rprintf(FERROR, "write failed on %s: %s\n",
 250                                 full_fname(fname), strerror(errno));
 251                         exit_cleanup(RERR_FILEIO);
 252                 }
 253                 offset += len;
 254         }
 255
 256         flush_write_file(fd);
 257
 258         if (do_progress)
 259                 end_progress(total_size);
 260
 261         if (fd != -1 && offset > 0 && sparse_end(fd) != 0) {
 262                 rprintf(FERROR, "write failed on %s: %s\n",
 263                         full_fname(fname), strerror(errno));
 264                 exit_cleanup(RERR_FILEIO);
 265         }
 266
 267         sum_end(file_sum1);
 268
 269         read_buf(f_in,file_sum2,MD4_SUM_LENGTH);
 270         if (verbose > 2) {
 271                 rprintf(FINFO,"got file_sum\n");
 272         }
 273         if (fd != -1 && memcmp(file_sum1,file_sum2,MD4_SUM_LENGTH) != 0) {
 274                 return 0;
 275         }
 276         return 1;
 277 }
 278
 279
 280 /**
 281  * main routine for receiver process.
 282  *
 283  * Receiver process runs on the same host as the generator process. */
 284 int recv_files(int f_in,struct file_list *flist,char *local_name)
 285 {
 286         int fd1,fd2;
 287         STRUCT_STAT st;
 288         char *fname, fbuf[MAXPATHLEN];
 289         char template[MAXPATHLEN];
 290         char fnametmp[MAXPATHLEN];
 291         char *fnamecmp;
 292         char fnamecmpbuf[MAXPATHLEN];
 293         struct map_struct *mapbuf;
 294         int i;
 295         struct file_struct *file;
 296         int phase=0;
 297         int recv_ok;
 298         extern struct stats stats;
 299         extern int preserve_perms;
 300         extern int delete_after;
 301         extern int orig_umask;
 302         struct stats initial_stats;
 303
 304         if (verbose > 2) {
 305                 rprintf(FINFO,"recv_files(%d) starting\n",flist->count);
 306         }
 307
 308         while (1) {
 309                 cleanup_disable();
 310
 311                 i = read_int(f_in);
 312                 if (i == -1) {
 313                         if (phase == 0) {
 314                                 phase++;
 315                                 csum_length = SUM_LENGTH;
 316                                 if (verbose > 2)
 317                                         rprintf(FINFO,"recv_files phase=%d\n",phase);
 318                                 send_msg(MSG_DONE, "", 0);
 319                                 continue;
 320                         }
 321                         break;
 322                 }
 323
 324                 if (i < 0 || i >= flist->count) {
 325                         rprintf(FERROR,"Invalid file index %d in recv_files (count=%d)\n",
 326                                 i, flist->count);
 327                         exit_cleanup(RERR_PROTOCOL);
 328                 }
 329
 330                 file = flist->files[i];
 331
 332                 stats.current_file_index = i;
 333                 stats.num_transferred_files++;
 334                 stats.total_transferred_size += file->length;
 335                 cleanup_got_literal = 0;
 336
 337                 if (local_name)
 338                         fname = local_name;
 339                 else
 340                         fname = f_name_to(file, fbuf);
 341
 342                 if (dry_run) {
 343                         if (!am_server && verbose) {    /* log transfer */
 344                                 rprintf(FINFO, "%s\n", fname);
 345                         }
 346                         continue;
 347                 }
 348
 349                 initial_stats = stats;
 350
 351                 if (verbose > 2)
 352                         rprintf(FINFO,"recv_files(%s)\n",fname);
 353
 354                 fnamecmp = fname;
 355
 356                 /* open the file */
 357                 fd1 = do_open(fnamecmp, O_RDONLY, 0);
 358
 359                 if ((fd1 == -1) && (compare_dest != NULL)) {
 360                         /* try the file at compare_dest instead */
 361                         pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 362                                  compare_dest, fname);
 363                         fnamecmp = fnamecmpbuf;
 364                         fd1 = do_open(fnamecmp, O_RDONLY, 0);
 365                 }
 366
 367                 if (fd1 != -1 && do_fstat(fd1,&st) != 0) {
 368                         rprintf(FERROR, "fstat %s failed: %s\n",
 369                                 full_fname(fnamecmp), strerror(errno));
 370                         receive_data(f_in,NULL,-1,NULL,file->length);
 371                         close(fd1);
 372                         continue;
 373                 }
 374
 375                 if (fd1 != -1 && S_ISDIR(st.st_mode) && fnamecmp == fname) {
 376                         /* this special handling for directories
 377                          * wouldn't be necessary if robust_rename()
 378                          * and the underlying robust_unlink could cope
 379                          * with directories
 380                          */
 381                         rprintf(FERROR,"recv_files: %s is a directory\n",
 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_ISREG(st.st_mode)) {
 389                         close(fd1);
 390                         fd1 = -1;
 391                         mapbuf = NULL;
 392                 }
 393
 394                 if (fd1 != -1 && !preserve_perms) {
 395                         /* if the file exists already and we aren't preserving
 396                          * permissions then act as though the remote end sent
 397                          * us the file permissions we already have */
 398                         file->mode = st.st_mode;
 399                 }
 400
 401                 if (fd1 != -1 && st.st_size > 0) {
 402                         mapbuf = map_file(fd1,st.st_size);
 403                         if (verbose > 2)
 404                                 rprintf(FINFO,"recv mapped %s of size %.0f\n",fnamecmp,(double)st.st_size);
 405                 } else
 406                         mapbuf = NULL;
 407
 408                 if (!get_tmpname(fnametmp,fname)) {
 409                         if (mapbuf) unmap_file(mapbuf);
 410                         if (fd1 != -1) close(fd1);
 411                         continue;
 412                 }
 413
 414                 strlcpy(template, fnametmp, sizeof template);
 415
 416                 /* we initially set the perms without the
 417                  * setuid/setgid bits to ensure that there is no race
 418                  * condition. They are then correctly updated after
 419                  * the lchown. Thanks to snabb@epipe.fi for pointing
 420                  * this out.  We also set it initially without group
 421                  * access because of a similar race condition. */
 422                 fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 423
 424                 /* in most cases parent directories will already exist
 425                  * because their information should have been previously
 426                  * transferred, but that may not be the case with -R */
 427                 if (fd2 == -1 && relative_paths && errno == ENOENT &&
 428                     create_directory_path(fnametmp, orig_umask) == 0) {
 429                         strlcpy(fnametmp, template, sizeof fnametmp);
 430                         fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 431                 }
 432                 if (fd2 == -1) {
 433                         rprintf(FERROR, "mkstemp %s failed: %s\n",
 434                                 full_fname(fnametmp), strerror(errno));
 435                         receive_data(f_in,mapbuf,-1,NULL,file->length);
 436                         if (mapbuf) unmap_file(mapbuf);
 437                         if (fd1 != -1) close(fd1);
 438                         continue;
 439                 }
 440
 441                 cleanup_set(fnametmp, fname, file, mapbuf, fd1, fd2);
 442
 443                 if (!am_server && verbose) {    /* log transfer */
 444                         rprintf(FINFO, "%s\n", fname);
 445                 }
 446
 447                 /* recv file data */
 448                 recv_ok = receive_data(f_in,mapbuf,fd2,fname,file->length);
 449
 450                 log_recv(file, &initial_stats);
 451
 452                 if (mapbuf) unmap_file(mapbuf);
 453                 if (fd1 != -1) {
 454                         close(fd1);
 455                 }
 456                 close(fd2);
 457
 458                 if (verbose > 2)
 459                         rprintf(FINFO,"renaming %s to %s\n",fnametmp,fname);
 460
 461                 finish_transfer(fname, fnametmp, file);
 462
 463                 cleanup_disable();
 464
 465                 if (!recv_ok) {
 466                         if (csum_length == SUM_LENGTH) {
 467                                 rprintf(FERROR,"ERROR: file corruption in %s. File changed during transfer?\n",
 468                                         full_fname(fname));
 469                         } else {
 470                                 char buf[4];
 471                                 if (verbose > 1)
 472                                         rprintf(FINFO,"redoing %s(%d)\n",fname,i);
 473                                 SIVAL(buf, 0, i);
 474                                 send_msg(MSG_REDO, buf, 4);
 475                         }
 476                 }
 477         }
 478
 479         if (delete_after && recurse && delete_mode && !local_name
 480             && flist->count > 0)
 481                 delete_files(flist);
 482
 483         if (verbose > 2)
 484                 rprintf(FINFO,"recv_files finished\n");
 485
 486         return 0;
 487 }