receiver.c

   1 /*
   2    Copyright (C) Andrew Tridgell 1996
   3    Copyright (C) Paul Mackerras 1996
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 2 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, write to the Free Software
  17    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18 */
  19
  20 #include "rsync.h"
  21
  22 extern int verbose;
  23 extern int recurse;
  24 extern int delete_mode;
  25 extern int remote_version;
  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 char *backup_suffix;
  38
  39 static struct delete_list {
  40         dev_t dev;
  41         INO_T inode;
  42 } *delete_list;
  43 static int dlist_len, dlist_alloc_len;
  44
  45 /* yuck! This function wouldn't have been necessary if I had the sorting
  46    algorithm right. Unfortunately fixing the sorting algorithm would introduce
  47    a backward incompatibility as file list indexes are sent over the link.
  48 */
  49 static int delete_already_done(struct file_list *flist,int j)
  50 {
  51         int i;
  52         STRUCT_STAT st;
  53
  54         if (link_stat(f_name(flist->files[j]), &st)) return 1;
  55
  56         for (i=0;i<dlist_len;i++) {
  57                 if (st.st_ino == delete_list[i].inode &&
  58                     st.st_dev == delete_list[i].dev)
  59                         return 1;
  60         }
  61
  62         return 0;
  63 }
  64
  65 static void add_delete_entry(struct file_struct *file)
  66 {
  67         if (dlist_len == dlist_alloc_len) {
  68                 dlist_alloc_len += 1024;
  69                 delete_list = (struct delete_list *)Realloc(delete_list, sizeof(delete_list[0])*dlist_alloc_len);
  70                 if (!delete_list) out_of_memory("add_delete_entry");
  71         }
  72
  73         delete_list[dlist_len].dev = file->dev;
  74         delete_list[dlist_len].inode = file->inode;
  75         dlist_len++;
  76
  77         if (verbose > 3)
  78                 rprintf(FINFO,"added %s to delete list\n", f_name(file));
  79 }
  80
  81 static void delete_one(struct file_struct *f)
  82 {
  83         if (!S_ISDIR(f->mode)) {
  84                 if (robust_unlink(f_name(f)) != 0) {
  85                         rprintf(FERROR,"unlink %s : %s\n",f_name(f),strerror(errno));
  86                 } else if (verbose) {
  87                         rprintf(FINFO,"deleting %s\n",f_name(f));
  88                 }
  89         } else {
  90                 if (do_rmdir(f_name(f)) != 0) {
  91                         if (errno != ENOTEMPTY && errno != EEXIST)
  92                                 rprintf(FERROR,"rmdir %s : %s\n",f_name(f),strerror(errno));
  93                 } else if (verbose) {
  94                         rprintf(FINFO,"deleting directory %s\n",f_name(f));
  95                 }
  96         }
  97 }
  98
  99
 100
 101
 102 /* this deletes any files on the receiving side that are not present
 103    on the sending side. For version 1.6.4 I have changed the behaviour
 104    to match more closely what most people seem to expect of this option */
 105 void delete_files(struct file_list *flist)
 106 {
 107         struct file_list *local_file_list;
 108         int i, j;
 109         char *name;
 110         extern int module_id;
 111         extern int ignore_errors;
 112         extern int max_delete;
 113         static int deletion_count;
 114
 115         if (cvs_exclude)
 116                 add_cvs_excludes();
 117
 118         if (io_error && !(lp_ignore_errors(module_id) || ignore_errors)) {
 119                 rprintf(FINFO,"IO error encountered - skipping file deletion\n");
 120                 return;
 121         }
 122
 123         for (j=0;j<flist->count;j++) {
 124                 if (!S_ISDIR(flist->files[j]->mode) ||
 125                     !(flist->files[j]->flags & FLAG_DELETE)) continue;
 126
 127                 if (remote_version < 19 &&
 128                     delete_already_done(flist, j)) continue;
 129
 130                 name = strdup(f_name(flist->files[j]));
 131
 132                 if (!(local_file_list = send_file_list(-1,1,&name))) {
 133                         free(name);
 134                         continue;
 135                 }
 136
 137                 if (verbose > 1)
 138                         rprintf(FINFO,"deleting in %s\n", name);
 139
 140                 for (i=local_file_list->count-1;i>=0;i--) {
 141                         if (max_delete && deletion_count > max_delete) break;
 142                         if (!local_file_list->files[i]->basename) continue;
 143                         if (remote_version < 19 &&
 144                             S_ISDIR(local_file_list->files[i]->mode))
 145                                 add_delete_entry(local_file_list->files[i]);
 146                         if (-1 == flist_find(flist,local_file_list->files[i])) {
 147                                 char *f = f_name(local_file_list->files[i]);
 148                                 int k = strlen(f) - strlen(backup_suffix);
 149 /* Hi Andrew, do we really need to play with backup_suffix here? */
 150                                 if (make_backups && ((k <= 0) ||
 151                                             (strcmp(f+k,backup_suffix) != 0))) {
 152                                         (void) make_backup(f);
 153                                 } else {
 154                                         deletion_count++;
 155                                         delete_one(local_file_list->files[i]);
 156                                 }
 157                         }
 158                 }
 159                 flist_free(local_file_list);
 160                 free(name);
 161         }
 162 }
 163
 164
 165 static int get_tmpname(char *fnametmp, char *fname)
 166 {
 167         char *f;
 168
 169         /* open tmp file */
 170         if (tmpdir) {
 171                 f = strrchr(fname,'/');
 172                 if (f == NULL)
 173                         f = fname;
 174                 else
 175                         f++;
 176                 if (strlen(tmpdir)+strlen(f)+10 > MAXPATHLEN) {
 177                         rprintf(FERROR,"filename too long\n");
 178                         return 0;
 179                 }
 180                 slprintf(fnametmp,MAXPATHLEN, "%s/.%s.XXXXXX",tmpdir,f);
 181                 return 1;
 182         }
 183
 184         f = strrchr(fname,'/');
 185
 186         if (strlen(fname)+9 > MAXPATHLEN) {
 187                 rprintf(FERROR,"filename too long\n");
 188                 return 0;
 189         }
 190
 191         if (f) {
 192                 *f = 0;
 193                 slprintf(fnametmp,MAXPATHLEN,"%s/.%s.XXXXXX",
 194                          fname,f+1);
 195                 *f = '/';
 196         } else {
 197                 slprintf(fnametmp,MAXPATHLEN,".%s.XXXXXX",fname);
 198         }
 199
 200         return 1;
 201 }
 202
 203
 204 static int receive_data(int f_in,struct map_struct *buf,int fd,char *fname,
 205                         OFF_T total_size)
 206 {
 207         int i,n,remainder,len,count;
 208         OFF_T offset = 0;
 209         OFF_T offset2;
 210         char *data;
 211         static char file_sum1[MD4_SUM_LENGTH];
 212         static char file_sum2[MD4_SUM_LENGTH];
 213         char *map=NULL;
 214
 215         count = read_int(f_in);
 216         n = read_int(f_in);
 217         remainder = read_int(f_in);
 218
 219         sum_init();
 220
 221         for (i=recv_token(f_in,&data); i != 0; i=recv_token(f_in,&data)) {
 222
 223                 show_progress(offset, total_size);
 224
 225                 if (i > 0) {
 226                         extern int cleanup_got_literal;
 227
 228                         if (verbose > 3) {
 229                                 rprintf(FINFO,"data recv %d at %.0f\n",
 230                                         i,(double)offset);
 231                         }
 232
 233                         stats.literal_data += i;
 234                         cleanup_got_literal = 1;
 235
 236                         sum_update(data,i);
 237
 238                         if (fd != -1 && write_file(fd,data,i) != i) {
 239                                 rprintf(FERROR,"write failed on %s : %s\n",fname,strerror(errno));
 240                                 exit_cleanup(RERR_FILEIO);
 241                         }
 242                         offset += i;
 243                         continue;
 244                 }
 245
 246                 i = -(i+1);
 247                 offset2 = i*(OFF_T)n;
 248                 len = n;
 249                 if (i == count-1 && remainder != 0)
 250                         len = remainder;
 251
 252                 stats.matched_data += len;
 253
 254                 if (verbose > 3)
 255                         rprintf(FINFO,"chunk[%d] of size %d at %.0f offset=%.0f\n",
 256                                 i,len,(double)offset2,(double)offset);
 257
 258                 if (buf) {
 259                         map = map_ptr(buf,offset2,len);
 260
 261                         see_token(map, len);
 262                         sum_update(map,len);
 263                 }
 264
 265                 if (fd != -1 && write_file(fd,map,len) != len) {
 266                         rprintf(FERROR,"write failed on %s : %s\n",
 267                                 fname,strerror(errno));
 268                         exit_cleanup(RERR_FILEIO);
 269                 }
 270                 offset += len;
 271         }
 272
 273         end_progress(total_size);
 274
 275         if (fd != -1 && offset > 0 && sparse_end(fd) != 0) {
 276                 rprintf(FERROR,"write failed on %s : %s\n",
 277                         fname,strerror(errno));
 278                 exit_cleanup(RERR_FILEIO);
 279         }
 280
 281         sum_end(file_sum1);
 282
 283         if (remote_version >= 14) {
 284                 read_buf(f_in,file_sum2,MD4_SUM_LENGTH);
 285                 if (verbose > 2) {
 286                         rprintf(FINFO,"got file_sum\n");
 287                 }
 288                 if (fd != -1 &&
 289                     memcmp(file_sum1,file_sum2,MD4_SUM_LENGTH) != 0) {
 290                         return 0;
 291                 }
 292         }
 293         return 1;
 294 }
 295
 296
 297 /* main routine for receiver process. Receiver process runs on the
 298         same host as the generator process. */
 299
 300 int recv_files(int f_in,struct file_list *flist,char *local_name,int f_gen)
 301 {
 302         int fd1,fd2;
 303         STRUCT_STAT st;
 304         char *fname;
 305         char fnametmp[MAXPATHLEN];
 306         char *fnamecmp;
 307         char fnamecmpbuf[MAXPATHLEN];
 308         struct map_struct *buf;
 309         int i;
 310         struct file_struct *file;
 311         int phase=0;
 312         int recv_ok;
 313         extern struct stats stats;
 314         extern int preserve_perms;
 315         extern int delete_after;
 316         struct stats initial_stats;
 317
 318         if (verbose > 2) {
 319                 rprintf(FINFO,"recv_files(%d) starting\n",flist->count);
 320         }
 321
 322         while (1) {
 323                 cleanup_disable();
 324
 325                 i = read_int(f_in);
 326                 if (i == -1) {
 327                         if (phase==0 && remote_version >= 13) {
 328                                 phase++;
 329                                 csum_length = SUM_LENGTH;
 330                                 if (verbose > 2)
 331                                         rprintf(FINFO,"recv_files phase=%d\n",phase);
 332                                 write_int(f_gen,-1);
 333                                 continue;
 334                         }
 335                         break;
 336                 }
 337
 338                 if (i < 0 || i >= flist->count) {
 339                         rprintf(FERROR,"Invalid file index %d in recv_files (count=%d)\n",
 340                                 i, flist->count);
 341                         exit_cleanup(RERR_PROTOCOL);
 342                 }
 343
 344                 file = flist->files[i];
 345                 fname = f_name(file);
 346
 347                 stats.num_transferred_files++;
 348                 stats.total_transferred_size += file->length;
 349
 350                 if (local_name)
 351                         fname = local_name;
 352
 353                 if (dry_run) {
 354                         if (!am_server) {
 355                                 log_transfer(file, fname);
 356                         }
 357                         continue;
 358                 }
 359
 360                 initial_stats = stats;
 361
 362                 if (verbose > 2)
 363                         rprintf(FINFO,"recv_files(%s)\n",fname);
 364
 365                 fnamecmp = fname;
 366
 367                 /* open the file */
 368                 fd1 = do_open(fnamecmp, O_RDONLY, 0);
 369
 370                 if ((fd1 == -1) && (compare_dest != NULL)) {
 371                         /* try the file at compare_dest instead */
 372                         slprintf(fnamecmpbuf,MAXPATHLEN,"%s/%s",
 373                                                 compare_dest,fname);
 374                         fnamecmp = fnamecmpbuf;
 375                         fd1 = do_open(fnamecmp, O_RDONLY, 0);
 376                 }
 377
 378                 if (fd1 != -1 && do_fstat(fd1,&st) != 0) {
 379                         rprintf(FERROR,"fstat %s : %s\n",fnamecmp,strerror(errno));
 380                         receive_data(f_in,NULL,-1,NULL,file->length);
 381                         close(fd1);
 382                         continue;
 383                 }
 384
 385                 if (fd1 != -1 && !S_ISREG(st.st_mode)) {
 386                         rprintf(FERROR,"%s : not a regular file (recv_files)\n",fnamecmp);
 387                         receive_data(f_in,NULL,-1,NULL,file->length);
 388                         close(fd1);
 389                         continue;
 390                 }
 391
 392                 if (fd1 != -1 && !preserve_perms) {
 393                         /* if the file exists already and we aren't perserving
 394                            presmissions 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                         buf = 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                         buf = NULL;
 405                 }
 406
 407                 if (!get_tmpname(fnametmp,fname)) {
 408                         if (buf) unmap_file(buf);
 409                         if (fd1 != -1) close(fd1);
 410                         continue;
 411                 }
 412
 413                 /* mktemp is deliberately used here instead of mkstemp.
 414                    because O_EXCL is used on the open, the race condition
 415                    is not a problem or a security hole, and we want to
 416                    control the access permissions on the created file. */
 417                 if (NULL == do_mktemp(fnametmp)) {
 418                         rprintf(FERROR,"mktemp %s failed\n",fnametmp);
 419                         receive_data(f_in,buf,-1,NULL,file->length);
 420                         if (buf) unmap_file(buf);
 421                         if (fd1 != -1) close(fd1);
 422                         continue;
 423                 }
 424
 425                 /* we initially set the perms without the
 426                    setuid/setgid bits to ensure that there is no race
 427                    condition. They are then correctly updated after
 428                    the lchown. Thanks to snabb@epipe.fi for pointing
 429                    this out.  We also set it initially without group
 430                    access because of a similar race condition. */
 431                 fd2 = do_open(fnametmp,O_WRONLY|O_CREAT|O_EXCL,
 432                               file->mode & INITACCESSPERMS);
 433
 434                 /* in most cases parent directories will already exist
 435                    because their information should have been previously
 436                    transferred, but that may not be the case with -R */
 437                 if (fd2 == -1 && relative_paths && errno == ENOENT &&
 438                     create_directory_path(fnametmp) == 0) {
 439                         fd2 = do_open(fnametmp,O_WRONLY|O_CREAT|O_EXCL,
 440                                       file->mode & INITACCESSPERMS);
 441                 }
 442                 if (fd2 == -1) {
 443                         rprintf(FERROR,"cannot create %s : %s\n",fnametmp,strerror(errno));
 444                         receive_data(f_in,buf,-1,NULL,file->length);
 445                         if (buf) unmap_file(buf);
 446                         if (fd1 != -1) close(fd1);
 447                         continue;
 448                 }
 449
 450                 cleanup_set(fnametmp, fname, file, buf, fd1, fd2);
 451
 452                 if (!am_server) {
 453                         log_transfer(file, fname);
 454                 }
 455
 456                 /* recv file data */
 457                 recv_ok = receive_data(f_in,buf,fd2,fname,file->length);
 458
 459                 log_recv(file, &initial_stats);
 460
 461                 if (buf) unmap_file(buf);
 462                 if (fd1 != -1) {
 463                         close(fd1);
 464                 }
 465                 close(fd2);
 466
 467                 if (verbose > 2)
 468                         rprintf(FINFO,"renaming %s to %s\n",fnametmp,fname);
 469
 470                 finish_transfer(fname, fnametmp, file);
 471
 472                 cleanup_disable();
 473
 474                 if (!recv_ok) {
 475                         if (csum_length == SUM_LENGTH) {
 476                                 rprintf(FERROR,"ERROR: file corruption in %s. File changed during transfer?\n",
 477                                         fname);
 478                         } else {
 479                                 if (verbose > 1)
 480                                         rprintf(FINFO,"redoing %s(%d)\n",fname,i);
 481                                 write_int(f_gen,i);
 482                         }
 483                 }
 484         }
 485
 486         if (delete_after) {
 487                 if (recurse && delete_mode && !local_name && flist->count>0) {
 488                         delete_files(flist);
 489                 }
 490         }
 491
 492         if (preserve_hard_links)
 493                 do_hard_links(flist);
 494
 495         /* now we need to fix any directory permissions that were
 496            modified during the transfer */
 497         for (i = 0; i < flist->count; i++) {
 498                 file = flist->files[i];
 499                 if (!file->basename || !S_ISDIR(file->mode)) continue;
 500                 recv_generator(local_name?local_name:f_name(file),flist,i,-1);
 501         }
 502
 503         if (verbose > 2)
 504                 rprintf(FINFO,"recv_files finished\n");
 505
 506         return 0;
 507 }
 508