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. */
  74 void delete_files(struct file_list *flist)
  75 {
  76         struct file_list *local_file_list;
  77         int i, j;
  78         char *argv[1], fbuf[MAXPATHLEN];
  79         extern int module_id;
  80         extern int ignore_errors;
  81         extern int max_delete;
  82         static int deletion_count;
  83
  84         if (cvs_exclude)
  85                 add_cvs_excludes();
  86
  87         if (io_error && !(lp_ignore_errors(module_id) || ignore_errors)) {
  88                 rprintf(FINFO,"IO error encountered - skipping file deletion\n");
  89                 return;
  90         }
  91
  92         for (j = 0; j < flist->count; j++) {
  93                 if (!(flist->files[j]->flags & FLAG_TOP_DIR)
  94                     || !S_ISDIR(flist->files[j]->mode))
  95                         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         if (flist->hlink_pool) {
 308                 pool_destroy(flist->hlink_pool);
 309                 flist->hlink_pool = NULL;
 310         }
 311
 312         while (1) {
 313                 cleanup_disable();
 314
 315                 i = read_int(f_in);
 316                 if (i == -1) {
 317                         if (phase == 0) {
 318                                 phase++;
 319                                 csum_length = SUM_LENGTH;
 320                                 if (verbose > 2)
 321                                         rprintf(FINFO,"recv_files phase=%d\n",phase);
 322                                 send_msg(MSG_DONE, "", 0);
 323                                 continue;
 324                         }
 325                         break;
 326                 }
 327
 328                 if (i < 0 || i >= flist->count) {
 329                         rprintf(FERROR,"Invalid file index %d in recv_files (count=%d)\n",
 330                                 i, flist->count);
 331                         exit_cleanup(RERR_PROTOCOL);
 332                 }
 333
 334                 file = flist->files[i];
 335
 336                 stats.current_file_index = i;
 337                 stats.num_transferred_files++;
 338                 stats.total_transferred_size += file->length;
 339                 cleanup_got_literal = 0;
 340
 341                 if (local_name)
 342                         fname = local_name;
 343                 else
 344                         fname = f_name_to(file, fbuf);
 345
 346                 if (dry_run) {
 347                         if (!am_server && verbose) {    /* log transfer */
 348                                 rprintf(FINFO, "%s\n", fname);
 349                         }
 350                         continue;
 351                 }
 352
 353                 initial_stats = stats;
 354
 355                 if (verbose > 2)
 356                         rprintf(FINFO,"recv_files(%s)\n",fname);
 357
 358                 fnamecmp = fname;
 359
 360                 /* open the file */
 361                 fd1 = do_open(fnamecmp, O_RDONLY, 0);
 362
 363                 if (fd1 == -1 && compare_dest != NULL) {
 364                         /* try the file at compare_dest instead */
 365                         pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 366                                  compare_dest, fname);
 367                         fnamecmp = fnamecmpbuf;
 368                         fd1 = do_open(fnamecmp, O_RDONLY, 0);
 369                 }
 370
 371                 if (fd1 != -1 && do_fstat(fd1,&st) != 0) {
 372                         rprintf(FERROR, "fstat %s failed: %s\n",
 373                                 full_fname(fnamecmp), strerror(errno));
 374                         receive_data(f_in,NULL,-1,NULL,file->length);
 375                         close(fd1);
 376                         continue;
 377                 }
 378
 379                 if (fd1 != -1 && S_ISDIR(st.st_mode) && fnamecmp == fname) {
 380                         /* this special handling for directories
 381                          * wouldn't be necessary if robust_rename()
 382                          * and the underlying robust_unlink could cope
 383                          * with directories
 384                          */
 385                         rprintf(FERROR,"recv_files: %s is a directory\n",
 386                                 full_fname(fnamecmp));
 387                         receive_data(f_in, NULL, -1, NULL, file->length);
 388                         close(fd1);
 389                         continue;
 390                 }
 391
 392                 if (fd1 != -1 && !S_ISREG(st.st_mode)) {
 393                         close(fd1);
 394                         fd1 = -1;
 395                         mapbuf = NULL;
 396                 }
 397
 398                 if (fd1 != -1 && !preserve_perms) {
 399                         /* if the file exists already and we aren't preserving
 400                          * permissions then act as though the remote end sent
 401                          * us the file permissions we already have */
 402                         file->mode = st.st_mode;
 403                 }
 404
 405                 if (fd1 != -1 && st.st_size > 0) {
 406                         mapbuf = map_file(fd1,st.st_size);
 407                         if (verbose > 2)
 408                                 rprintf(FINFO,"recv mapped %s of size %.0f\n",fnamecmp,(double)st.st_size);
 409                 } else
 410                         mapbuf = NULL;
 411
 412                 if (!get_tmpname(fnametmp,fname)) {
 413                         if (mapbuf) unmap_file(mapbuf);
 414                         if (fd1 != -1) close(fd1);
 415                         continue;
 416                 }
 417
 418                 strlcpy(template, fnametmp, sizeof template);
 419
 420                 /* we initially set the perms without the
 421                  * setuid/setgid bits to ensure that there is no race
 422                  * condition. They are then correctly updated after
 423                  * the lchown. Thanks to snabb@epipe.fi for pointing
 424                  * this out.  We also set it initially without group
 425                  * access because of a similar race condition. */
 426                 fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 427
 428                 /* in most cases parent directories will already exist
 429                  * because their information should have been previously
 430                  * transferred, but that may not be the case with -R */
 431                 if (fd2 == -1 && relative_paths && errno == ENOENT &&
 432                     create_directory_path(fnametmp, orig_umask) == 0) {
 433                         strlcpy(fnametmp, template, sizeof fnametmp);
 434                         fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 435                 }
 436                 if (fd2 == -1) {
 437                         rprintf(FERROR, "mkstemp %s failed: %s\n",
 438                                 full_fname(fnametmp), strerror(errno));
 439                         receive_data(f_in,mapbuf,-1,NULL,file->length);
 440                         if (mapbuf) unmap_file(mapbuf);
 441                         if (fd1 != -1) close(fd1);
 442                         continue;
 443                 }
 444
 445                 cleanup_set(fnametmp, fname, file, mapbuf, fd1, fd2);
 446
 447                 if (!am_server && verbose) {    /* log transfer */
 448                         rprintf(FINFO, "%s\n", fname);
 449                 }
 450
 451                 /* recv file data */
 452                 recv_ok = receive_data(f_in,mapbuf,fd2,fname,file->length);
 453
 454                 log_recv(file, &initial_stats);
 455
 456                 if (mapbuf) unmap_file(mapbuf);
 457                 if (fd1 != -1) {
 458                         close(fd1);
 459                 }
 460                 close(fd2);
 461
 462                 if (verbose > 2)
 463                         rprintf(FINFO,"renaming %s to %s\n",fnametmp,fname);
 464
 465                 finish_transfer(fname, fnametmp, file);
 466
 467                 cleanup_disable();
 468
 469                 if (!recv_ok) {
 470                         if (csum_length == SUM_LENGTH) {
 471                                 rprintf(FERROR,"ERROR: file corruption in %s. File changed during transfer?\n",
 472                                         full_fname(fname));
 473                         } else {
 474                                 char buf[4];
 475                                 if (verbose > 1)
 476                                         rprintf(FINFO,"redoing %s(%d)\n",fname,i);
 477                                 SIVAL(buf, 0, i);
 478                                 send_msg(MSG_REDO, buf, 4);
 479                         }
 480                 }
 481         }
 482
 483         if (delete_after && recurse && delete_mode && !local_name
 484             && flist->count > 0)
 485                 delete_files(flist);
 486
 487         if (verbose > 2)
 488                 rprintf(FINFO,"recv_files finished\n");
 489
 490         return 0;
 491 }