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