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 extern int keep_partial;
  49
  50 static void delete_one(char *fn, int is_dir)
  51 {
  52         if (!is_dir) {
  53                 if (robust_unlink(fn) != 0) {
  54                         rprintf(FERROR, "delete_one: unlink %s failed: %s\n",
  55                                 full_fname(fn), strerror(errno));
  56                 } else if (verbose) {
  57                         rprintf(FINFO, "deleting %s\n", fn);
  58                 }
  59         } else {
  60                 if (do_rmdir(fn) != 0) {
  61                         if (errno != ENOTEMPTY && errno != EEXIST) {
  62                                 rprintf(FERROR, "delete_one: rmdir %s failed: %s\n",
  63                                         full_fname(fn), strerror(errno));
  64                         }
  65                 } else if (verbose) {
  66                         rprintf(FINFO, "deleting directory %s\n", fn);
  67                 }
  68         }
  69 }
  70
  71
  72 static int is_backup_file(char *fn)
  73 {
  74         int k = strlen(fn) - backup_suffix_len;
  75         return k > 0 && strcmp(fn+k, backup_suffix) == 0;
  76 }
  77
  78
  79 /* This deletes any files on the receiving side that are not present
  80  * on the sending side. */
  81 void delete_files(struct file_list *flist)
  82 {
  83         struct file_list *local_file_list;
  84         int i, j;
  85         char *argv[1], fbuf[MAXPATHLEN];
  86         static int deletion_count;
  87
  88         if (cvs_exclude)
  89                 add_cvs_excludes();
  90
  91         if (io_error && !(lp_ignore_errors(module_id) || ignore_errors)) {
  92                 rprintf(FINFO,"IO error encountered - skipping file deletion\n");
  93                 return;
  94         }
  95
  96         for (j = 0; j < flist->count; j++) {
  97                 if (!(flist->files[j]->flags & FLAG_TOP_DIR)
  98                     || !S_ISDIR(flist->files[j]->mode))
  99                         continue;
 100
 101                 argv[0] = f_name_to(flist->files[j], fbuf);
 102
 103                 if (!(local_file_list = send_file_list(-1, 1, argv)))
 104                         continue;
 105
 106                 if (verbose > 1)
 107                         rprintf(FINFO, "deleting in %s\n", fbuf);
 108
 109                 for (i = local_file_list->count-1; i >= 0; i--) {
 110                         if (max_delete && deletion_count > max_delete)
 111                                 break;
 112                         if (!local_file_list->files[i]->basename)
 113                                 continue;
 114                         if (flist_find(flist,local_file_list->files[i]) < 0) {
 115                                 char *f = f_name(local_file_list->files[i]);
 116                                 if (make_backups && (backup_dir || !is_backup_file(f))) {
 117                                         (void) make_backup(f);
 118                                         if (verbose)
 119                                                 rprintf(FINFO, "deleting %s\n", f);
 120                                 } else {
 121                                         int mode = local_file_list->files[i]->mode;
 122                                         delete_one(f, S_ISDIR(mode) != 0);
 123                                 }
 124                                 deletion_count++;
 125                         }
 126                 }
 127                 flist_free(local_file_list);
 128         }
 129 }
 130
 131
 132 /*
 133  * get_tmpname() - create a tmp filename for a given filename
 134  *
 135  *   If a tmpdir is defined, use that as the directory to
 136  *   put it in.  Otherwise, the tmp filename is in the same
 137  *   directory as the given name.  Note that there may be no
 138  *   directory at all in the given name!
 139  *
 140  *   The tmp filename is basically the given filename with a
 141  *   dot prepended, and .XXXXXX appended (for mkstemp() to
 142  *   put its unique gunk in).  Take care to not exceed
 143  *   either the MAXPATHLEN or NAME_MAX, esp. the last, as
 144  *   the basename basically becomes 8 chars longer. In that
 145  *   case, the original name is shortened sufficiently to
 146  *   make it all fit.
 147  *
 148  *   Of course, there's no real reason for the tmp name to
 149  *   look like the original, except to satisfy us humans.
 150  *   As long as it's unique, rsync will work.
 151  */
 152
 153 static int get_tmpname(char *fnametmp, char *fname)
 154 {
 155         char *f;
 156         int     length = 0;
 157         int     maxname;
 158
 159         if (tmpdir) {
 160                 /* Note: this can't overflow, so the return value is safe */
 161                 length = strlcpy(fnametmp, tmpdir, MAXPATHLEN - 2);
 162                 fnametmp[length++] = '/';
 163                 fnametmp[length] = '\0';        /* always NULL terminated */
 164         }
 165
 166         if ((f = strrchr(fname, '/')) != NULL) {
 167                 ++f;
 168                 if (!tmpdir) {
 169                         length = f - fname;
 170                         /* copy up to and including the slash */
 171                         strlcpy(fnametmp, fname, length + 1);
 172                 }
 173         } else
 174                 f = fname;
 175         fnametmp[length++] = '.';
 176         fnametmp[length] = '\0';                /* always NULL terminated */
 177
 178         maxname = MIN(MAXPATHLEN - 7 - length, NAME_MAX - 8);
 179
 180         if (maxname < 1) {
 181                 rprintf(FERROR, "temporary filename too long: %s\n", fname);
 182                 fnametmp[0] = '\0';
 183                 return 0;
 184         }
 185
 186         strlcpy(fnametmp + length, f, maxname);
 187         strcat(fnametmp + length, ".XXXXXX");
 188
 189         return 1;
 190 }
 191
 192
 193 static int receive_data(int f_in,struct map_struct *mapbuf,int fd,char *fname,
 194                         OFF_T total_size)
 195 {
 196         int i;
 197         struct sum_struct sum;
 198         unsigned int len;
 199         OFF_T offset = 0;
 200         OFF_T offset2;
 201         char *data;
 202         static char file_sum1[MD4_SUM_LENGTH];
 203         static char file_sum2[MD4_SUM_LENGTH];
 204         char *map=NULL;
 205
 206         read_sum_head(f_in, &sum);
 207
 208         sum_init();
 209
 210         while ((i = recv_token(f_in, &data)) != 0) {
 211                 if (do_progress)
 212                         show_progress(offset, total_size);
 213
 214                 if (i > 0) {
 215                         if (verbose > 3) {
 216                                 rprintf(FINFO,"data recv %d at %.0f\n",
 217                                         i,(double)offset);
 218                         }
 219
 220                         stats.literal_data += i;
 221                         cleanup_got_literal = 1;
 222
 223                         sum_update(data,i);
 224
 225                         if (fd != -1 && write_file(fd,data,i) != i) {
 226                                 rprintf(FERROR, "write failed on %s: %s\n",
 227                                         full_fname(fname), strerror(errno));
 228                                 exit_cleanup(RERR_FILEIO);
 229                         }
 230                         offset += i;
 231                         continue;
 232                 }
 233
 234                 i = -(i+1);
 235                 offset2 = i*(OFF_T)sum.blength;
 236                 len = sum.blength;
 237                 if (i == (int) sum.count-1 && sum.remainder != 0)
 238                         len = sum.remainder;
 239
 240                 stats.matched_data += len;
 241
 242                 if (verbose > 3)
 243                         rprintf(FINFO,"chunk[%d] of size %d at %.0f offset=%.0f\n",
 244                                 i,len,(double)offset2,(double)offset);
 245
 246                 if (mapbuf) {
 247                         map = map_ptr(mapbuf,offset2,len);
 248
 249                         see_token(map, len);
 250                         sum_update(map,len);
 251                 }
 252
 253                 if (fd != -1 && write_file(fd,map,len) != (int) len) {
 254                         rprintf(FERROR, "write failed on %s: %s\n",
 255                                 full_fname(fname), strerror(errno));
 256                         exit_cleanup(RERR_FILEIO);
 257                 }
 258                 offset += len;
 259         }
 260
 261         flush_write_file(fd);
 262
 263         if (do_progress)
 264                 end_progress(total_size);
 265
 266         if (fd != -1 && offset > 0 && sparse_end(fd) != 0) {
 267                 rprintf(FERROR, "write failed on %s: %s\n",
 268                         full_fname(fname), strerror(errno));
 269                 exit_cleanup(RERR_FILEIO);
 270         }
 271
 272         sum_end(file_sum1);
 273
 274         read_buf(f_in,file_sum2,MD4_SUM_LENGTH);
 275         if (verbose > 2) {
 276                 rprintf(FINFO,"got file_sum\n");
 277         }
 278         if (fd != -1 && memcmp(file_sum1,file_sum2,MD4_SUM_LENGTH) != 0) {
 279                 return 0;
 280         }
 281         return 1;
 282 }
 283
 284
 285 /**
 286  * main routine for receiver process.
 287  *
 288  * Receiver process runs on the same host as the generator process. */
 289 int recv_files(int f_in,struct file_list *flist,char *local_name)
 290 {
 291         int fd1,fd2;
 292         STRUCT_STAT st;
 293         char *fname, fbuf[MAXPATHLEN];
 294         char template[MAXPATHLEN];
 295         char fnametmp[MAXPATHLEN];
 296         char *fnamecmp;
 297         char fnamecmpbuf[MAXPATHLEN];
 298         struct map_struct *mapbuf;
 299         int i;
 300         struct file_struct *file;
 301         int phase=0;
 302         int recv_ok;
 303         struct stats initial_stats;
 304
 305         if (verbose > 2) {
 306                 rprintf(FINFO,"recv_files(%d) starting\n",flist->count);
 307         }
 308
 309         if (flist->hlink_pool) {
 310                 pool_destroy(flist->hlink_pool);
 311                 flist->hlink_pool = NULL;
 312         }
 313
 314         while (1) {
 315                 cleanup_disable();
 316
 317                 i = read_int(f_in);
 318                 if (i == -1) {
 319                         if (phase == 0) {
 320                                 phase++;
 321                                 csum_length = SUM_LENGTH;
 322                                 if (verbose > 2)
 323                                         rprintf(FINFO,"recv_files phase=%d\n",phase);
 324                                 send_msg(MSG_DONE, "", 0);
 325                                 continue;
 326                         }
 327                         break;
 328                 }
 329
 330                 if (i < 0 || i >= flist->count) {
 331                         rprintf(FERROR,"Invalid file index %d in recv_files (count=%d)\n",
 332                                 i, flist->count);
 333                         exit_cleanup(RERR_PROTOCOL);
 334                 }
 335
 336                 file = flist->files[i];
 337
 338                 stats.current_file_index = i;
 339                 stats.num_transferred_files++;
 340                 stats.total_transferred_size += file->length;
 341                 cleanup_got_literal = 0;
 342
 343                 if (local_name)
 344                         fname = local_name;
 345                 else
 346                         fname = f_name_to(file, fbuf);
 347
 348                 if (dry_run) {
 349                         if (!am_server && verbose) {    /* log transfer */
 350                                 rprintf(FINFO, "%s\n", fname);
 351                         }
 352                         continue;
 353                 }
 354
 355                 initial_stats = stats;
 356
 357                 if (verbose > 2)
 358                         rprintf(FINFO,"recv_files(%s)\n",fname);
 359
 360                 fnamecmp = fname;
 361
 362                 /* open the file */
 363                 fd1 = do_open(fnamecmp, O_RDONLY, 0);
 364
 365                 if (fd1 == -1 && compare_dest != NULL) {
 366                         /* try the file at compare_dest instead */
 367                         pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 368                                  compare_dest, fname);
 369                         fnamecmp = fnamecmpbuf;
 370                         fd1 = do_open(fnamecmp, O_RDONLY, 0);
 371                 }
 372
 373                 if (fd1 != -1 && do_fstat(fd1,&st) != 0) {
 374                         rprintf(FERROR, "fstat %s failed: %s\n",
 375                                 full_fname(fnamecmp), strerror(errno));
 376                         receive_data(f_in,NULL,-1,NULL,file->length);
 377                         close(fd1);
 378                         continue;
 379                 }
 380
 381                 if (fd1 != -1 && S_ISDIR(st.st_mode) && fnamecmp == fname) {
 382                         /* this special handling for directories
 383                          * wouldn't be necessary if robust_rename()
 384                          * and the underlying robust_unlink could cope
 385                          * with directories
 386                          */
 387                         rprintf(FERROR,"recv_files: %s is a directory\n",
 388                                 full_fname(fnamecmp));
 389                         receive_data(f_in, NULL, -1, NULL, file->length);
 390                         close(fd1);
 391                         continue;
 392                 }
 393
 394                 if (fd1 != -1 && !S_ISREG(st.st_mode)) {
 395                         close(fd1);
 396                         fd1 = -1;
 397                         mapbuf = NULL;
 398                 }
 399
 400                 if (fd1 != -1 && !preserve_perms) {
 401                         /* if the file exists already and we aren't preserving
 402                          * permissions then act as though the remote end sent
 403                          * us the file permissions we already have */
 404                         file->mode = st.st_mode;
 405                 }
 406
 407                 if (fd1 != -1 && st.st_size > 0) {
 408                         mapbuf = map_file(fd1,st.st_size);
 409                         if (verbose > 2)
 410                                 rprintf(FINFO,"recv mapped %s of size %.0f\n",fnamecmp,(double)st.st_size);
 411                 } else
 412                         mapbuf = NULL;
 413
 414                 if (!get_tmpname(fnametmp,fname)) {
 415                         if (mapbuf) unmap_file(mapbuf);
 416                         if (fd1 != -1) close(fd1);
 417                         continue;
 418                 }
 419
 420                 strlcpy(template, fnametmp, sizeof template);
 421
 422                 /* we initially set the perms without the
 423                  * setuid/setgid bits to ensure that there is no race
 424                  * condition. They are then correctly updated after
 425                  * the lchown. Thanks to snabb@epipe.fi for pointing
 426                  * this out.  We also set it initially without group
 427                  * access because of a similar race condition. */
 428                 fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 429
 430                 /* in most cases parent directories will already exist
 431                  * because their information should have been previously
 432                  * transferred, but that may not be the case with -R */
 433                 if (fd2 == -1 && relative_paths && errno == ENOENT &&
 434                     create_directory_path(fnametmp, orig_umask) == 0) {
 435                         strlcpy(fnametmp, template, sizeof fnametmp);
 436                         fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 437                 }
 438                 if (fd2 == -1) {
 439                         rprintf(FERROR, "mkstemp %s failed: %s\n",
 440                                 full_fname(fnametmp), strerror(errno));
 441                         receive_data(f_in,mapbuf,-1,NULL,file->length);
 442                         if (mapbuf) unmap_file(mapbuf);
 443                         if (fd1 != -1) close(fd1);
 444                         continue;
 445                 }
 446
 447                 cleanup_set(fnametmp, fname, file, mapbuf, fd1, fd2);
 448
 449                 if (!am_server && verbose) {    /* log transfer */
 450                         rprintf(FINFO, "%s\n", fname);
 451                 }
 452
 453                 /* recv file data */
 454                 recv_ok = receive_data(f_in,mapbuf,fd2,fname,file->length);
 455
 456                 log_recv(file, &initial_stats);
 457
 458                 if (mapbuf) unmap_file(mapbuf);
 459                 if (fd1 != -1) {
 460                         close(fd1);
 461                 }
 462                 if (close(fd2) < 0) {
 463                         rprintf(FERROR, "close failed on %s: %s\n",
 464                                 full_fname(fnametmp), strerror(errno));
 465                         exit_cleanup(RERR_FILEIO);
 466                 }
 467
 468                 if (verbose > 2)
 469                         rprintf(FINFO,"renaming %s to %s\n",fnametmp,fname);
 470
 471                 if (recv_ok || keep_partial)
 472                         finish_transfer(fname, fnametmp, file, recv_ok);
 473                 else
 474                         do_unlink(fnametmp);
 475
 476                 cleanup_disable();
 477
 478                 if (!recv_ok) {
 479                         if (csum_length == SUM_LENGTH) {
 480                                 rprintf(FERROR,"ERROR: file corruption in %s. File changed during transfer?\n",
 481                                         full_fname(fname));
 482                         } else {
 483                                 char buf[4];
 484                                 if (verbose > 1)
 485                                         rprintf(FINFO,"redoing %s(%d)\n",fname,i);
 486                                 SIVAL(buf, 0, i);
 487                                 send_msg(MSG_REDO, buf, 4);
 488                         }
 489                 }
 490         }
 491
 492         if (delete_after && recurse && delete_mode && !local_name
 493             && flist->count > 0)
 494                 delete_files(flist);
 495
 496         if (verbose > 2)
 497                 rprintf(FINFO,"recv_files finished\n");
 498
 499         return 0;
 500 }