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