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