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
  40 static struct delete_list {
  41         dev_t dev;
  42         INO_T inode;
  43 } *delete_list;
  44 static int dlist_len, dlist_alloc_len;
  45
  46
  47 /* yuck! This function wouldn't have been necessary if I had the sorting
  48    algorithm right. Unfortunately fixing the sorting algorithm would introduce
  49    a backward incompatibility as file list indexes are sent over the link.
  50 */
  51 static int delete_already_done(struct file_list *flist,int j)
  52 {
  53         int i;
  54         STRUCT_STAT st;
  55
  56         if (link_stat(f_name(flist->files[j]), &st)) return 1;
  57
  58         for (i=0;i<dlist_len;i++) {
  59                 if (st.st_ino == delete_list[i].inode &&
  60                     st.st_dev == delete_list[i].dev)
  61                         return 1;
  62         }
  63
  64         return 0;
  65 }
  66
  67 static void add_delete_entry(struct file_struct *file)
  68 {
  69         if (dlist_len == dlist_alloc_len) {
  70                 dlist_alloc_len += 1024;
  71                 delete_list = (struct delete_list *)Realloc(delete_list, sizeof(delete_list[0])*dlist_alloc_len);
  72                 if (!delete_list) out_of_memory("add_delete_entry");
  73         }
  74
  75         delete_list[dlist_len].dev = file->dev;
  76         delete_list[dlist_len].inode = file->inode;
  77         dlist_len++;
  78
  79         if (verbose > 3)
  80                 rprintf(FINFO,"added %s to delete list\n", f_name(file));
  81 }
  82
  83 static void delete_one(struct file_struct *f)
  84 {
  85         if (!S_ISDIR(f->mode)) {
  86                 if (robust_unlink(f_name(f)) != 0) {
  87                         rprintf(FERROR,"unlink %s : %s\n",f_name(f),strerror(errno));
  88                 } else if (verbose) {
  89                         rprintf(FINFO,"deleting %s\n",f_name(f));
  90                 }
  91         } else {
  92                 if (do_rmdir(f_name(f)) != 0) {
  93                         if (errno != ENOTEMPTY && errno != EEXIST)
  94                                 rprintf(FERROR,"rmdir %s : %s\n",f_name(f),strerror(errno));
  95                 } else if (verbose) {
  96                         rprintf(FINFO,"deleting directory %s\n",f_name(f));
  97                 }
  98         }
  99 }
 100
 101
 102
 103
 104 /* this deletes any files on the receiving side that are not present
 105    on the sending side. For version 1.6.4 I have changed the behaviour
 106    to match more closely what most people seem to expect of this option */
 107 static void delete_files(struct file_list *flist)
 108 {
 109         struct file_list *local_file_list;
 110         int i, j;
 111         char *name;
 112
 113         if (cvs_exclude)
 114                 add_cvs_excludes();
 115
 116         if (io_error) {
 117                 rprintf(FINFO,"IO error encountered - skipping file deletion\n");
 118                 return;
 119         }
 120
 121         for (j=0;j<flist->count;j++) {
 122                 if (!S_ISDIR(flist->files[j]->mode) ||
 123                     !(flist->files[j]->flags & FLAG_DELETE)) continue;
 124
 125                 if (remote_version < 19 &&
 126                     delete_already_done(flist, j)) continue;
 127
 128                 name = strdup(f_name(flist->files[j]));
 129
 130                 if (!(local_file_list = send_file_list(-1,1,&name))) {
 131                         free(name);
 132                         continue;
 133                 }
 134
 135                 if (verbose > 1)
 136                         rprintf(FINFO,"deleting in %s\n", name);
 137
 138                 for (i=local_file_list->count-1;i>=0;i--) {
 139                         if (!local_file_list->files[i]->basename) continue;
 140                         if (remote_version < 19 &&
 141                             S_ISDIR(local_file_list->files[i]->mode))
 142                                 add_delete_entry(local_file_list->files[i]);
 143                         if (-1 == flist_find(flist,local_file_list->files[i])) {
 144                                 char *f = f_name(local_file_list->files[i]);
 145                                 int k = strlen(f) - strlen(backup_suffix);
 146                                 if (make_backups && ((k <= 0) ||
 147                                             (strcmp(f+k,backup_suffix) != 0))) {
 148                                         (void) make_backup(f);
 149                                 } else {
 150                                         delete_one(local_file_list->files[i]);
 151                                 }
 152                         }
 153                 }
 154                 flist_free(local_file_list);
 155                 free(name);
 156         }
 157 }
 158
 159
 160 static int get_tmpname(char *fnametmp, char *fname)
 161 {
 162         char *f;
 163
 164         /* open tmp file */
 165         if (tmpdir) {
 166                 f = strrchr(fname,'/');
 167                 if (f == NULL)
 168                         f = fname;
 169                 else
 170                         f++;
 171                 if (strlen(tmpdir)+strlen(f)+10 > MAXPATHLEN) {
 172                         rprintf(FERROR,"filename too long\n");
 173                         return 0;
 174                 }
 175                 slprintf(fnametmp,MAXPATHLEN, "%s/.%s.XXXXXX",tmpdir,f);
 176                 return 1;
 177         }
 178
 179         f = strrchr(fname,'/');
 180
 181         if (strlen(fname)+9 > MAXPATHLEN) {
 182                 rprintf(FERROR,"filename too long\n");
 183                 return 0;
 184         }
 185
 186         if (f) {
 187                 *f = 0;
 188                 slprintf(fnametmp,MAXPATHLEN,"%s/.%s.XXXXXX",
 189                          fname,f+1);
 190                 *f = '/';
 191         } else {
 192                 slprintf(fnametmp,MAXPATHLEN,".%s.XXXXXX",fname);
 193         }
 194
 195         return 1;
 196 }
 197
 198
 199 static int receive_data(int f_in,struct map_struct *buf,int fd,char *fname,
 200                         OFF_T total_size)
 201 {
 202         int i,n,remainder,len,count;
 203         OFF_T offset = 0;
 204         OFF_T offset2;
 205         char *data;
 206         static char file_sum1[MD4_SUM_LENGTH];
 207         static char file_sum2[MD4_SUM_LENGTH];
 208         char *map=NULL;
 209
 210         count = read_int(f_in);
 211         n = read_int(f_in);
 212         remainder = read_int(f_in);
 213
 214         sum_init();
 215
 216         for (i=recv_token(f_in,&data); i != 0; i=recv_token(f_in,&data)) {
 217
 218                 show_progress(offset, total_size);
 219
 220                 if (i > 0) {
 221                         extern int cleanup_got_literal;
 222
 223                         if (verbose > 3) {
 224                                 rprintf(FINFO,"data recv %d at %d\n",
 225                                         i,(int)offset);
 226                         }
 227
 228                         stats.literal_data += i;
 229                         cleanup_got_literal = 1;
 230
 231                         sum_update(data,i);
 232
 233                         if (fd != -1 && write_file(fd,data,i) != i) {
 234                                 rprintf(FERROR,"write failed on %s : %s\n",fname,strerror(errno));
 235                                 exit_cleanup(RERR_FILEIO);
 236                         }
 237                         offset += i;
 238                         continue;
 239                 }
 240
 241                 i = -(i+1);
 242                 offset2 = i*n;
 243                 len = n;
 244                 if (i == count-1 && remainder != 0)
 245                         len = remainder;
 246
 247                 stats.matched_data += len;
 248
 249                 if (verbose > 3)
 250                         rprintf(FINFO,"chunk[%d] of size %d at %d offset=%d\n",
 251                                 i,len,(int)offset2,(int)offset);
 252
 253                 map = map_ptr(buf,offset2,len);
 254
 255                 see_token(map, len);
 256                 sum_update(map,len);
 257
 258                 if (fd != -1 && write_file(fd,map,len) != len) {
 259                         rprintf(FERROR,"write failed on %s : %s\n",
 260                                 fname,strerror(errno));
 261                         exit_cleanup(RERR_FILEIO);
 262                 }
 263                 offset += len;
 264         }
 265
 266         end_progress();
 267
 268         if (fd != -1 && offset > 0 && sparse_end(fd) != 0) {
 269                 rprintf(FERROR,"write failed on %s : %s\n",
 270                         fname,strerror(errno));
 271                 exit_cleanup(RERR_FILEIO);
 272         }
 273
 274         sum_end(file_sum1);
 275
 276         if (remote_version >= 14) {
 277                 read_buf(f_in,file_sum2,MD4_SUM_LENGTH);
 278                 if (verbose > 2) {
 279                         rprintf(FINFO,"got file_sum\n");
 280                 }
 281                 if (fd != -1 &&
 282                     memcmp(file_sum1,file_sum2,MD4_SUM_LENGTH) != 0) {
 283                         return 0;
 284                 }
 285         }
 286         return 1;
 287 }
 288
 289
 290
 291 int recv_files(int f_in,struct file_list *flist,char *local_name,int f_gen)
 292 {
 293         int fd1,fd2;
 294         STRUCT_STAT st;
 295         char *fname;
 296         char fnametmp[MAXPATHLEN];
 297         char *fnamecmp;
 298         char fnamecmpbuf[MAXPATHLEN];
 299         struct map_struct *buf;
 300         int i;
 301         struct file_struct *file;
 302         int phase=0;
 303         int recv_ok;
 304         extern struct stats stats;
 305         struct stats initial_stats;
 306
 307         if (verbose > 2) {
 308                 rprintf(FINFO,"recv_files(%d) starting\n",flist->count);
 309         }
 310
 311         if (recurse && delete_mode && !local_name && flist->count>0) {
 312                 delete_files(flist);
 313         }
 314
 315         while (1) {
 316                 cleanup_disable();
 317
 318                 i = read_int(f_in);
 319                 if (i == -1) {
 320                         if (phase==0 && remote_version >= 13) {
 321                                 phase++;
 322                                 csum_length = SUM_LENGTH;
 323                                 if (verbose > 2)
 324                                         rprintf(FINFO,"recv_files phase=%d\n",phase);
 325                                 write_int(f_gen,-1);
 326                                 continue;
 327                         }
 328                         break;
 329                 }
 330
 331                 if (i < 0 || i >= flist->count) {
 332                         rprintf(FERROR,"Invalid file index %d in recv_files (count=%d)\n",
 333                                 i, flist->count);
 334                         exit_cleanup(RERR_PROTOCOL);
 335                 }
 336
 337                 file = flist->files[i];
 338                 fname = f_name(file);
 339
 340                 stats.num_transferred_files++;
 341                 stats.total_transferred_size += file->length;
 342
 343                 if (local_name)
 344                         fname = local_name;
 345
 346                 if (dry_run) {
 347                         if (!am_server) {
 348                                 log_transfer(file, 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 = open(fnamecmp,O_RDONLY);
 362
 363                 if ((fd1 == -1) && (compare_dest != NULL)) {
 364                         /* try the file at compare_dest instead */
 365                         slprintf(fnamecmpbuf,MAXPATHLEN,"%s/%s",
 366                                                 compare_dest,fname);
 367                         fnamecmp = fnamecmpbuf;
 368                         fd1 = open(fnamecmp,O_RDONLY);
 369                 }
 370
 371                 if (fd1 != -1 && do_fstat(fd1,&st) != 0) {
 372                         rprintf(FERROR,"fstat %s : %s\n",fnamecmp,strerror(errno));
 373                         receive_data(f_in,NULL,-1,NULL,file->length);
 374                         close(fd1);
 375                         continue;
 376                 }
 377
 378                 if (fd1 != -1 && !S_ISREG(st.st_mode)) {
 379                         rprintf(FERROR,"%s : not a regular file (recv_files)\n",fnamecmp);
 380                         receive_data(f_in,NULL,-1,NULL,file->length);
 381                         close(fd1);
 382                         continue;
 383                 }
 384
 385                 if (fd1 != -1 && st.st_size > 0) {
 386                         buf = map_file(fd1,st.st_size);
 387                         if (verbose > 2)
 388                                 rprintf(FINFO,"recv mapped %s of size %d\n",fnamecmp,(int)st.st_size);
 389                 } else {
 390                         buf = NULL;
 391                 }
 392
 393                 if (!get_tmpname(fnametmp,fname)) {
 394                         if (buf) unmap_file(buf);
 395                         if (fd1 != -1) close(fd1);
 396                         continue;
 397                 }
 398
 399                 /* mktemp is deliberately used here instead of mkstemp.
 400                    because O_EXCL is used on the open, the race condition
 401                    is not a problem or a security hole, and we want to
 402                    control the access permissions on the created file. */
 403                 if (NULL == do_mktemp(fnametmp)) {
 404                         rprintf(FERROR,"mktemp %s failed\n",fnametmp);
 405                         receive_data(f_in,buf,-1,NULL,file->length);
 406                         if (buf) unmap_file(buf);
 407                         if (fd1 != -1) close(fd1);
 408                         continue;
 409                 }
 410
 411                 /* we initially set the perms without the
 412                    setuid/setgid bits to ensure that there is no race
 413                    condition. They are then correctly updated after
 414                    the lchown. Thanks to snabb@epipe.fi for pointing
 415                    this out.  We also set it initially without group
 416                    access because of a similar race condition. */
 417                 fd2 = do_open(fnametmp,O_WRONLY|O_CREAT|O_EXCL,
 418                               file->mode & INITACCESSPERMS);
 419
 420                 /* in most cases parent directories will already exist
 421                    because their information should have been previously
 422                    transferred, but that may not be the case with -R */
 423                 if (fd2 == -1 && relative_paths && errno == ENOENT &&
 424                     create_directory_path(fnametmp) == 0) {
 425                         fd2 = do_open(fnametmp,O_WRONLY|O_CREAT|O_EXCL,
 426                                       file->mode & INITACCESSPERMS);
 427                 }
 428                 if (fd2 == -1) {
 429                         rprintf(FERROR,"cannot create %s : %s\n",fnametmp,strerror(errno));
 430                         receive_data(f_in,buf,-1,NULL,file->length);
 431                         if (buf) unmap_file(buf);
 432                         if (fd1 != -1) close(fd1);
 433                         continue;
 434                 }
 435
 436                 cleanup_set(fnametmp, fname, file, buf, fd1, fd2);
 437
 438                 if (!am_server) {
 439                         log_transfer(file, fname);
 440                 }
 441
 442                 /* recv file data */
 443                 recv_ok = receive_data(f_in,buf,fd2,fname,file->length);
 444
 445                 log_recv(file, &initial_stats);
 446
 447                 if (buf) unmap_file(buf);
 448                 if (fd1 != -1) {
 449                         close(fd1);
 450                 }
 451                 close(fd2);
 452
 453                 if (verbose > 2)
 454                         rprintf(FINFO,"renaming %s to %s\n",fnametmp,fname);
 455
 456                 finish_transfer(fname, fnametmp, file);
 457
 458                 cleanup_disable();
 459
 460                 if (!recv_ok) {
 461                         if (csum_length == SUM_LENGTH) {
 462                                 rprintf(FERROR,"ERROR: file corruption in %s. File changed during transfer?\n",
 463                                         fname);
 464                         } else {
 465                                 if (verbose > 1)
 466                                         rprintf(FINFO,"redoing %s(%d)\n",fname,i);
 467                                 write_int(f_gen,i);
 468                         }
 469                 }
 470         }
 471
 472         if (preserve_hard_links)
 473                 do_hard_links(flist);
 474
 475         /* now we need to fix any directory permissions that were
 476            modified during the transfer */
 477         for (i = 0; i < flist->count; i++) {
 478                 file = flist->files[i];
 479                 if (!file->basename || !S_ISDIR(file->mode)) continue;
 480                 recv_generator(f_name(file),flist,i,-1);
 481         }
 482
 483         if (verbose > 2)
 484                 rprintf(FINFO,"recv_files finished\n");
 485
 486         return 0;
 487 }
 488