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