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 remote_version;
  27 extern int csum_length;
  28 extern struct stats stats;
  29 extern int dry_run;
  30 extern int am_server;
  31 extern int relative_paths;
  32 extern int preserve_hard_links;
  33 extern int cvs_exclude;
  34 extern int io_error;
  35 extern char *tmpdir;
  36 extern char *compare_dest;
  37 extern int make_backups;
  38 extern char *backup_suffix;
  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 /* yuck! This function wouldn't have been necessary if I had the sorting
  47    algorithm right. Unfortunately fixing the sorting algorithm would introduce
  48    a backward incompatibility as file list indexes are sent over the link.
  49 */
  50 static int delete_already_done(struct file_list *flist,int j)
  51 {
  52         int i;
  53         STRUCT_STAT st;
  54
  55         if (link_stat(f_name(flist->files[j]), &st)) return 1;
  56
  57         for (i=0;i<dlist_len;i++) {
  58                 if (st.st_ino == delete_list[i].inode &&
  59                     st.st_dev == delete_list[i].dev)
  60                         return 1;
  61         }
  62
  63         return 0;
  64 }
  65
  66 static void add_delete_entry(struct file_struct *file)
  67 {
  68         if (dlist_len == dlist_alloc_len) {
  69                 dlist_alloc_len += 1024;
  70                 delete_list = (struct delete_list *)Realloc(delete_list, sizeof(delete_list[0])*dlist_alloc_len);
  71                 if (!delete_list) out_of_memory("add_delete_entry");
  72         }
  73
  74         delete_list[dlist_len].dev = file->dev;
  75         delete_list[dlist_len].inode = file->inode;
  76         dlist_len++;
  77
  78         if (verbose > 3)
  79                 rprintf(FINFO,"added %s to delete list\n", f_name(file));
  80 }
  81
  82 static void delete_one(struct file_struct *f)
  83 {
  84         if (!S_ISDIR(f->mode)) {
  85                 if (robust_unlink(f_name(f)) != 0) {
  86                         rprintf(FERROR,"delete_one: unlink %s: %s\n",f_name(f),strerror(errno));
  87                 } else if (verbose) {
  88                         rprintf(FINFO,"deleting %s\n",f_name(f));
  89                 }
  90         } else {
  91                 if (do_rmdir(f_name(f)) != 0) {
  92                         if (errno != ENOTEMPTY && errno != EEXIST)
  93                                 rprintf(FERROR,"delete_one: rmdir %s: %s\n",
  94                                         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 void delete_files(struct file_list *flist)
 108 {
 109         struct file_list *local_file_list;
 110         int i, j;
 111         char *name;
 112         extern int module_id;
 113         extern int ignore_errors;
 114         extern int max_delete;
 115         static int deletion_count;
 116
 117         if (cvs_exclude)
 118                 add_cvs_excludes();
 119
 120         if (io_error && !(lp_ignore_errors(module_id) || ignore_errors)) {
 121                 rprintf(FINFO,"IO error encountered - skipping file deletion\n");
 122                 return;
 123         }
 124
 125         for (j=0;j<flist->count;j++) {
 126                 if (!S_ISDIR(flist->files[j]->mode) ||
 127                     !(flist->files[j]->flags & FLAG_DELETE)) continue;
 128
 129                 if (remote_version < 19 &&
 130                     delete_already_done(flist, j)) continue;
 131
 132                 name = strdup(f_name(flist->files[j]));
 133
 134                 if (!(local_file_list = send_file_list(-1,1,&name))) {
 135                         free(name);
 136                         continue;
 137                 }
 138
 139                 if (verbose > 1)
 140                         rprintf(FINFO,"deleting in %s\n", name);
 141
 142                 for (i=local_file_list->count-1;i>=0;i--) {
 143                         if (max_delete && deletion_count > max_delete) break;
 144                         if (!local_file_list->files[i]->basename) continue;
 145                         if (remote_version < 19 &&
 146                             S_ISDIR(local_file_list->files[i]->mode))
 147                                 add_delete_entry(local_file_list->files[i]);
 148                         if (-1 == flist_find(flist,local_file_list->files[i])) {
 149                                 char *f = f_name(local_file_list->files[i]);
 150                                 int k = strlen(f) - strlen(backup_suffix);
 151 /* Hi Andrew, do we really need to play with backup_suffix here? */
 152                                 if (make_backups && ((k <= 0) ||
 153                                             (strcmp(f+k,backup_suffix) != 0))) {
 154                                         (void) make_backup(f);
 155                                 } else {
 156                                         deletion_count++;
 157                                         delete_one(local_file_list->files[i]);
 158                                 }
 159                         }
 160                 }
 161                 flist_free(local_file_list);
 162                 free(name);
 163         }
 164 }
 165
 166
 167 static int get_tmpname(char *fnametmp, char *fname)
 168 {
 169         char *f;
 170
 171         /* open tmp file */
 172         if (tmpdir) {
 173                 f = strrchr(fname,'/');
 174                 if (f == NULL)
 175                         f = fname;
 176                 else
 177                         f++;
 178                 if (strlen(tmpdir)+strlen(f)+10 > MAXPATHLEN) {
 179                         rprintf(FERROR,"filename too long\n");
 180                         return 0;
 181                 }
 182                 slprintf(fnametmp,MAXPATHLEN, "%s/.%s.XXXXXX",tmpdir,f);
 183                 return 1;
 184         }
 185
 186         f = strrchr(fname,'/');
 187
 188         if (strlen(fname)+9 > MAXPATHLEN) {
 189                 rprintf(FERROR,"filename too long\n");
 190                 return 0;
 191         }
 192
 193         if (f) {
 194                 *f = 0;
 195                 slprintf(fnametmp,MAXPATHLEN,"%s/.%s.XXXXXX",
 196                          fname,f+1);
 197                 *f = '/';
 198         } else {
 199                 slprintf(fnametmp,MAXPATHLEN,".%s.XXXXXX",fname);
 200         }
 201
 202         return 1;
 203 }
 204
 205
 206 static int receive_data(int f_in,struct map_struct *buf,int fd,char *fname,
 207                         OFF_T total_size)
 208 {
 209         int i,n,remainder,len,count;
 210         OFF_T offset = 0;
 211         OFF_T offset2;
 212         char *data;
 213         static char file_sum1[MD4_SUM_LENGTH];
 214         static char file_sum2[MD4_SUM_LENGTH];
 215         char *map=NULL;
 216
 217         count = read_int(f_in);
 218         n = read_int(f_in);
 219         remainder = read_int(f_in);
 220
 221         sum_init();
 222
 223         for (i=recv_token(f_in,&data); i != 0; i=recv_token(f_in,&data)) {
 224
 225                 show_progress(offset, total_size);
 226
 227                 if (i > 0) {
 228                         extern int cleanup_got_literal;
 229
 230                         if (verbose > 3) {
 231                                 rprintf(FINFO,"data recv %d at %.0f\n",
 232                                         i,(double)offset);
 233                         }
 234
 235                         stats.literal_data += i;
 236                         cleanup_got_literal = 1;
 237
 238                         sum_update(data,i);
 239
 240                         if (fd != -1 && write_file(fd,data,i) != i) {
 241                                 rprintf(FERROR,"write failed on %s : %s\n",fname,strerror(errno));
 242                                 exit_cleanup(RERR_FILEIO);
 243                         }
 244                         offset += i;
 245                         continue;
 246                 }
 247
 248                 i = -(i+1);
 249                 offset2 = i*(OFF_T)n;
 250                 len = n;
 251                 if (i == count-1 && remainder != 0)
 252                         len = remainder;
 253
 254                 stats.matched_data += len;
 255
 256                 if (verbose > 3)
 257                         rprintf(FINFO,"chunk[%d] of size %d at %.0f offset=%.0f\n",
 258                                 i,len,(double)offset2,(double)offset);
 259
 260                 if (buf) {
 261                         map = map_ptr(buf,offset2,len);
 262
 263                         see_token(map, len);
 264                         sum_update(map,len);
 265                 }
 266
 267                 if (fd != -1 && write_file(fd,map,len) != len) {
 268                         rprintf(FERROR,"write failed on %s : %s\n",
 269                                 fname,strerror(errno));
 270                         exit_cleanup(RERR_FILEIO);
 271                 }
 272                 offset += len;
 273         }
 274
 275         end_progress(total_size);
 276
 277         if (fd != -1 && offset > 0 && sparse_end(fd) != 0) {
 278                 rprintf(FERROR,"write failed on %s : %s\n",
 279                         fname,strerror(errno));
 280                 exit_cleanup(RERR_FILEIO);
 281         }
 282
 283         sum_end(file_sum1);
 284
 285         if (remote_version >= 14) {
 286                 read_buf(f_in,file_sum2,MD4_SUM_LENGTH);
 287                 if (verbose > 2) {
 288                         rprintf(FINFO,"got file_sum\n");
 289                 }
 290                 if (fd != -1 &&
 291                     memcmp(file_sum1,file_sum2,MD4_SUM_LENGTH) != 0) {
 292                         return 0;
 293                 }
 294         }
 295         return 1;
 296 }
 297
 298
 299 /* main routine for receiver process. Receiver process runs on the
 300         same host as the generator process. */
 301
 302 int recv_files(int f_in,struct file_list *flist,char *local_name,int f_gen)
 303 {
 304         int fd1,fd2;
 305         STRUCT_STAT st;
 306         char *fname;
 307         char fnametmp[MAXPATHLEN];
 308         char *fnamecmp;
 309         char fnamecmpbuf[MAXPATHLEN];
 310         struct map_struct *buf;
 311         int i;
 312         struct file_struct *file;
 313         int phase=0;
 314         int recv_ok;
 315         extern struct stats stats;
 316         extern int preserve_perms;
 317         extern int delete_after;
 318         struct stats initial_stats;
 319
 320         if (verbose > 2) {
 321                 rprintf(FINFO,"recv_files(%d) starting\n",flist->count);
 322         }
 323
 324         while (1) {
 325                 cleanup_disable();
 326
 327                 i = read_int(f_in);
 328                 if (i == -1) {
 329                         if (phase==0 && remote_version >= 13) {
 330                                 phase++;
 331                                 csum_length = SUM_LENGTH;
 332                                 if (verbose > 2)
 333                                         rprintf(FINFO,"recv_files phase=%d\n",phase);
 334                                 write_int(f_gen,-1);
 335                                 continue;
 336                         }
 337                         break;
 338                 }
 339
 340                 if (i < 0 || i >= flist->count) {
 341                         rprintf(FERROR,"Invalid file index %d in recv_files (count=%d)\n",
 342                                 i, flist->count);
 343                         exit_cleanup(RERR_PROTOCOL);
 344                 }
 345
 346                 file = flist->files[i];
 347                 fname = f_name(file);
 348
 349                 stats.num_transferred_files++;
 350                 stats.total_transferred_size += file->length;
 351
 352                 if (local_name)
 353                         fname = local_name;
 354
 355                 if (dry_run) {
 356                         if (!am_server) {
 357                                 log_transfer(file, fname);
 358                         }
 359                         continue;
 360                 }
 361
 362                 initial_stats = stats;
 363
 364                 if (verbose > 2)
 365                         rprintf(FINFO,"recv_files(%s)\n",fname);
 366
 367                 fnamecmp = fname;
 368
 369                 /* open the file */
 370                 fd1 = do_open(fnamecmp, O_RDONLY, 0);
 371
 372                 if ((fd1 == -1) && (compare_dest != NULL)) {
 373                         /* try the file at compare_dest instead */
 374                         slprintf(fnamecmpbuf,MAXPATHLEN,"%s/%s",
 375                                                 compare_dest,fname);
 376                         fnamecmp = fnamecmpbuf;
 377                         fd1 = do_open(fnamecmp, O_RDONLY, 0);
 378                 }
 379
 380                 if (fd1 != -1 && do_fstat(fd1,&st) != 0) {
 381                         rprintf(FERROR,"fstat %s : %s\n",fnamecmp,strerror(errno));
 382                         receive_data(f_in,NULL,-1,NULL,file->length);
 383                         close(fd1);
 384                         continue;
 385                 }
 386
 387                 if (fd1 != -1 && !S_ISREG(st.st_mode)) {
 388                         rprintf(FERROR,"%s : not a regular file (recv_files)\n",fnamecmp);
 389                         receive_data(f_in,NULL,-1,NULL,file->length);
 390                         close(fd1);
 391                         continue;
 392                 }
 393
 394                 if (fd1 != -1 && !preserve_perms) {
 395                         /* if the file exists already and we aren't perserving
 396                            presmissions then act as though the remote end sent
 397                            us the file permissions we already have */
 398                         file->mode = st.st_mode;
 399                 }
 400
 401                 if (fd1 != -1 && st.st_size > 0) {
 402                         buf = map_file(fd1,st.st_size);
 403                         if (verbose > 2)
 404                                 rprintf(FINFO,"recv mapped %s of size %.0f\n",fnamecmp,(double)st.st_size);
 405                 } else {
 406                         buf = NULL;
 407                 }
 408
 409                 if (!get_tmpname(fnametmp,fname)) {
 410                         if (buf) unmap_file(buf);
 411                         if (fd1 != -1) close(fd1);
 412                         continue;
 413                 }
 414
 415                 /* mktemp is deliberately used here instead of mkstemp.
 416                    because O_EXCL is used on the open, the race condition
 417                    is not a problem or a security hole, and we want to
 418                    control the access permissions on the created file. */
 419                 if (NULL == do_mktemp(fnametmp)) {
 420                         rprintf(FERROR,"mktemp %s failed\n",fnametmp);
 421                         receive_data(f_in,buf,-1,NULL,file->length);
 422                         if (buf) unmap_file(buf);
 423                         if (fd1 != -1) close(fd1);
 424                         continue;
 425                 }
 426
 427                 /* we initially set the perms without the
 428                    setuid/setgid bits to ensure that there is no race
 429                    condition. They are then correctly updated after
 430                    the lchown. Thanks to snabb@epipe.fi for pointing
 431                    this out.  We also set it initially without group
 432                    access because of a similar race condition. */
 433                 fd2 = do_open(fnametmp,O_WRONLY|O_CREAT|O_EXCL,
 434                               file->mode & INITACCESSPERMS);
 435
 436                 /* in most cases parent directories will already exist
 437                    because their information should have been previously
 438                    transferred, but that may not be the case with -R */
 439                 if (fd2 == -1 && relative_paths && errno == ENOENT &&
 440                     create_directory_path(fnametmp) == 0) {
 441                         fd2 = do_open(fnametmp,O_WRONLY|O_CREAT|O_EXCL,
 442                                       file->mode & INITACCESSPERMS);
 443                 }
 444                 if (fd2 == -1) {
 445                         rprintf(FERROR,"cannot create %s : %s\n",fnametmp,strerror(errno));
 446                         receive_data(f_in,buf,-1,NULL,file->length);
 447                         if (buf) unmap_file(buf);
 448                         if (fd1 != -1) close(fd1);
 449                         continue;
 450                 }
 451
 452                 cleanup_set(fnametmp, fname, file, buf, fd1, fd2);
 453
 454                 if (!am_server) {
 455                         log_transfer(file, fname);
 456                 }
 457
 458                 /* recv file data */
 459                 recv_ok = receive_data(f_in,buf,fd2,fname,file->length);
 460
 461                 log_recv(file, &initial_stats);
 462
 463                 if (buf) unmap_file(buf);
 464                 if (fd1 != -1) {
 465                         close(fd1);
 466                 }
 467                 close(fd2);
 468
 469                 if (verbose > 2)
 470                         rprintf(FINFO,"renaming %s to %s\n",fnametmp,fname);
 471
 472                 finish_transfer(fname, fnametmp, file);
 473
 474                 cleanup_disable();
 475
 476                 if (!recv_ok) {
 477                         if (csum_length == SUM_LENGTH) {
 478                                 rprintf(FERROR,"ERROR: file corruption in %s. File changed during transfer?\n",
 479                                         fname);
 480                         } else {
 481                                 if (verbose > 1)
 482                                         rprintf(FINFO,"redoing %s(%d)\n",fname,i);
 483                                 write_int(f_gen,i);
 484                         }
 485                 }
 486         }
 487
 488         if (delete_after) {
 489                 if (recurse && delete_mode && !local_name && flist->count>0) {
 490                         delete_files(flist);
 491                 }
 492         }
 493
 494         if (preserve_hard_links)
 495                 do_hard_links(flist);
 496
 497         /* now we need to fix any directory permissions that were
 498            modified during the transfer */
 499         for (i = 0; i < flist->count; i++) {
 500                 file = flist->files[i];
 501                 if (!file->basename || !S_ISDIR(file->mode)) continue;
 502                 recv_generator(local_name?local_name:f_name(file),flist,i,-1);
 503         }
 504
 505         if (verbose > 2)
 506                 rprintf(FINFO,"recv_files finished\n");
 507
 508         return 0;
 509 }
 510