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
  37
  38 static struct delete_list {
  39         dev_t dev;
  40         INO_T inode;
  41 } *delete_list;
  42 static int dlist_len, dlist_alloc_len;
  43
  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 (do_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 static void delete_files(struct file_list *flist)
 106 {
 107         struct file_list *local_file_list;
 108         int i, j;
 109         char *name;
 110
 111         if (cvs_exclude)
 112                 add_cvs_excludes();
 113
 114         if (io_error) {
 115                 rprintf(FINFO,"IO error encountered - skipping file deletion\n");
 116                 return;
 117         }
 118
 119         for (j=0;j<flist->count;j++) {
 120                 if (!S_ISDIR(flist->files[j]->mode) ||
 121                     !(flist->files[j]->flags & FLAG_DELETE)) continue;
 122
 123                 if (remote_version < 19 &&
 124                     delete_already_done(flist, j)) continue;
 125
 126                 name = strdup(f_name(flist->files[j]));
 127
 128                 if (!(local_file_list = send_file_list(-1,1,&name))) {
 129                         free(name);
 130                         continue;
 131                 }
 132
 133                 if (verbose > 1)
 134                         rprintf(FINFO,"deleting in %s\n", name);
 135
 136                 for (i=local_file_list->count-1;i>=0;i--) {
 137                         if (!local_file_list->files[i]->basename) continue;
 138                         if (remote_version < 19 &&
 139                             S_ISDIR(local_file_list->files[i]->mode))
 140                                 add_delete_entry(local_file_list->files[i]);
 141                         if (-1 == flist_find(flist,local_file_list->files[i])) {
 142                                 delete_one(local_file_list->files[i]);
 143                         }
 144                 }
 145                 flist_free(local_file_list);
 146                 free(name);
 147         }
 148 }
 149
 150
 151 static int get_tmpname(char *fnametmp, char *fname)
 152 {
 153         char *f;
 154
 155         /* open tmp file */
 156         if (tmpdir) {
 157                 f = strrchr(fname,'/');
 158                 if (f == NULL)
 159                         f = fname;
 160                 else
 161                         f++;
 162                 if (strlen(tmpdir)+strlen(f)+10 > MAXPATHLEN) {
 163                         rprintf(FERROR,"filename too long\n");
 164                         return 0;
 165                 }
 166                 slprintf(fnametmp,MAXPATHLEN-1, "%s/.%s.XXXXXX",tmpdir,f);
 167                 return 1;
 168         }
 169
 170         f = strrchr(fname,'/');
 171
 172         if (strlen(fname)+9 > MAXPATHLEN) {
 173                 rprintf(FERROR,"filename too long\n");
 174                 return 0;
 175         }
 176
 177         if (f) {
 178                 *f = 0;
 179                 slprintf(fnametmp,MAXPATHLEN-1,"%s/.%s.XXXXXX",
 180                          fname,f+1);
 181                 *f = '/';
 182         } else {
 183                 slprintf(fnametmp,MAXPATHLEN-1,".%s.XXXXXX",fname);
 184         }
 185
 186         return 1;
 187 }
 188
 189
 190 static int receive_data(int f_in,struct map_struct *buf,int fd,char *fname,
 191                         OFF_T total_size)
 192 {
 193         int i,n,remainder,len,count;
 194         OFF_T offset = 0;
 195         OFF_T offset2;
 196         char *data;
 197         static char file_sum1[MD4_SUM_LENGTH];
 198         static char file_sum2[MD4_SUM_LENGTH];
 199         char *map=NULL;
 200
 201         count = read_int(f_in);
 202         n = read_int(f_in);
 203         remainder = read_int(f_in);
 204
 205         sum_init();
 206
 207         for (i=recv_token(f_in,&data); i != 0; i=recv_token(f_in,&data)) {
 208
 209                 show_progress(offset, total_size);
 210
 211                 if (i > 0) {
 212                         extern int cleanup_got_literal;
 213
 214                         if (verbose > 3) {
 215                                 rprintf(FINFO,"data recv %d at %d\n",
 216                                         i,(int)offset);
 217                         }
 218
 219                         stats.literal_data += i;
 220                         cleanup_got_literal = 1;
 221
 222                         sum_update(data,i);
 223
 224                         if (fd != -1 && write_file(fd,data,i) != i) {
 225                                 rprintf(FERROR,"write failed on %s : %s\n",fname,strerror(errno));
 226                                 exit_cleanup(RERR_FILEIO);
 227                         }
 228                         offset += i;
 229                         continue;
 230                 }
 231
 232                 i = -(i+1);
 233                 offset2 = i*n;
 234                 len = n;
 235                 if (i == count-1 && remainder != 0)
 236                         len = remainder;
 237
 238                 stats.matched_data += len;
 239
 240                 if (verbose > 3)
 241                         rprintf(FINFO,"chunk[%d] of size %d at %d offset=%d\n",
 242                                 i,len,(int)offset2,(int)offset);
 243
 244                 map = map_ptr(buf,offset2,len);
 245
 246                 see_token(map, len);
 247                 sum_update(map,len);
 248
 249                 if (fd != -1 && write_file(fd,map,len) != len) {
 250                         rprintf(FERROR,"write failed on %s : %s\n",
 251                                 fname,strerror(errno));
 252                         exit_cleanup(RERR_FILEIO);
 253                 }
 254                 offset += len;
 255         }
 256
 257         end_progress();
 258
 259         if (fd != -1 && offset > 0 && sparse_end(fd) != 0) {
 260                 rprintf(FERROR,"write failed on %s : %s\n",
 261                         fname,strerror(errno));
 262                 exit_cleanup(RERR_FILEIO);
 263         }
 264
 265         sum_end(file_sum1);
 266
 267         if (remote_version >= 14) {
 268                 read_buf(f_in,file_sum2,MD4_SUM_LENGTH);
 269                 if (verbose > 2) {
 270                         rprintf(FINFO,"got file_sum\n");
 271                 }
 272                 if (fd != -1 &&
 273                     memcmp(file_sum1,file_sum2,MD4_SUM_LENGTH) != 0) {
 274                         return 0;
 275                 }
 276         }
 277         return 1;
 278 }
 279
 280
 281
 282 int recv_files(int f_in,struct file_list *flist,char *local_name,int f_gen)
 283 {
 284         int fd1,fd2;
 285         STRUCT_STAT st;
 286         char *fname;
 287         char fnametmp[MAXPATHLEN];
 288         char *fnamecmp;
 289         char fnamecmpbuf[MAXPATHLEN];
 290         struct map_struct *buf;
 291         int i;
 292         struct file_struct *file;
 293         int phase=0;
 294         int recv_ok;
 295         extern struct stats stats;
 296         struct stats initial_stats;
 297
 298         if (verbose > 2) {
 299                 rprintf(FINFO,"recv_files(%d) starting\n",flist->count);
 300         }
 301
 302         if (recurse && delete_mode && !local_name && flist->count>0) {
 303                 delete_files(flist);
 304         }
 305
 306         while (1) {
 307                 cleanup_disable();
 308
 309                 i = read_int(f_in);
 310                 if (i == -1) {
 311                         if (phase==0 && remote_version >= 13) {
 312                                 phase++;
 313                                 csum_length = SUM_LENGTH;
 314                                 if (verbose > 2)
 315                                         rprintf(FINFO,"recv_files phase=%d\n",phase);
 316                                 write_int(f_gen,-1);
 317                                 continue;
 318                         }
 319                         break;
 320                 }
 321
 322                 if (i < 0 || i >= flist->count) {
 323                         rprintf(FERROR,"Invalid file index %d in recv_files (count=%d)\n",
 324                                 i, flist->count);
 325                         exit_cleanup(RERR_PROTOCOL);
 326                 }
 327
 328                 file = flist->files[i];
 329                 fname = f_name(file);
 330
 331                 stats.num_transferred_files++;
 332                 stats.total_transferred_size += file->length;
 333
 334                 if (local_name)
 335                         fname = local_name;
 336
 337                 if (dry_run) {
 338                         if (!am_server) {
 339                                 log_transfer(file, fname);
 340                         }
 341                         continue;
 342                 }
 343
 344                 initial_stats = stats;
 345
 346                 if (verbose > 2)
 347                         rprintf(FINFO,"recv_files(%s)\n",fname);
 348
 349                 fnamecmp = fname;
 350
 351                 /* open the file */
 352                 fd1 = open(fnamecmp,O_RDONLY);
 353
 354                 if ((fd1 == -1) && (compare_dest != NULL)) {
 355                         /* try the file at compare_dest instead */
 356                         slprintf(fnamecmpbuf,MAXPATHLEN-1,"%s/%s",
 357                                                 compare_dest,fname);
 358                         fnamecmp = fnamecmpbuf;
 359                         fd1 = open(fnamecmp,O_RDONLY);
 360                 }
 361
 362                 if (fd1 != -1 && do_fstat(fd1,&st) != 0) {
 363                         rprintf(FERROR,"fstat %s : %s\n",fnamecmp,strerror(errno));
 364                         receive_data(f_in,NULL,-1,NULL,file->length);
 365                         close(fd1);
 366                         continue;
 367                 }
 368
 369                 if (fd1 != -1 && !S_ISREG(st.st_mode)) {
 370                         rprintf(FERROR,"%s : not a regular file (recv_files)\n",fnamecmp);
 371                         receive_data(f_in,NULL,-1,NULL,file->length);
 372                         close(fd1);
 373                         continue;
 374                 }
 375
 376                 if (fd1 != -1 && st.st_size > 0) {
 377                         buf = map_file(fd1,st.st_size);
 378                         if (verbose > 2)
 379                                 rprintf(FINFO,"recv mapped %s of size %d\n",fnamecmp,(int)st.st_size);
 380                 } else {
 381                         buf = NULL;
 382                 }
 383
 384                 if (!get_tmpname(fnametmp,fname)) {
 385                         if (buf) unmap_file(buf);
 386                         if (fd1 != -1) close(fd1);
 387                         continue;
 388                 }
 389
 390                 if (NULL == do_mktemp(fnametmp)) {
 391                         rprintf(FERROR,"mktemp %s failed\n",fnametmp);
 392                         receive_data(f_in,buf,-1,NULL,file->length);
 393                         if (buf) unmap_file(buf);
 394                         if (fd1 != -1) close(fd1);
 395                         continue;
 396                 }
 397
 398                 /* we initially set the perms without the
 399                    setuid/setgid bits to ensure that there is no race
 400                    condition. They are then correctly updated after
 401                    the lchown. Thanks to snabb@epipe.fi for pointing
 402                    this out */
 403                 fd2 = do_open(fnametmp,O_WRONLY|O_CREAT|O_EXCL,
 404                               file->mode & ACCESSPERMS);
 405
 406                 if (fd2 == -1 && relative_paths && errno == ENOENT &&
 407                     create_directory_path(fnametmp) == 0) {
 408                         fd2 = do_open(fnametmp,O_WRONLY|O_CREAT|O_EXCL,
 409                                       file->mode & ACCESSPERMS);
 410                 }
 411                 if (fd2 == -1) {
 412                         rprintf(FERROR,"open %s : %s\n",fnametmp,strerror(errno));
 413                         receive_data(f_in,buf,-1,NULL,file->length);
 414                         if (buf) unmap_file(buf);
 415                         if (fd1 != -1) close(fd1);
 416                         continue;
 417                 }
 418
 419                 cleanup_set(fnametmp, fname, file, buf, fd1, fd2);
 420
 421                 if (!am_server) {
 422                         log_transfer(file, fname);
 423                 }
 424
 425                 /* recv file data */
 426                 recv_ok = receive_data(f_in,buf,fd2,fname,file->length);
 427
 428                 log_recv(file, &initial_stats);
 429
 430                 if (buf) unmap_file(buf);
 431                 if (fd1 != -1) {
 432                         close(fd1);
 433                 }
 434                 close(fd2);
 435
 436                 if (verbose > 2)
 437                         rprintf(FINFO,"renaming %s to %s\n",fnametmp,fname);
 438
 439                 finish_transfer(fname, fnametmp, file);
 440
 441                 cleanup_disable();
 442
 443                 if (!recv_ok) {
 444                         if (csum_length == SUM_LENGTH) {
 445                                 rprintf(FERROR,"ERROR: file corruption in %s. File changed during transfer?\n",
 446                                         fname);
 447                         } else {
 448                                 if (verbose > 1)
 449                                         rprintf(FINFO,"redoing %s(%d)\n",fname,i);
 450                                 write_int(f_gen,i);
 451                         }
 452                 }
 453         }
 454
 455         if (preserve_hard_links)
 456                 do_hard_links(flist);
 457
 458         /* now we need to fix any directory permissions that were
 459            modified during the transfer */
 460         for (i = 0; i < flist->count; i++) {
 461                 file = flist->files[i];
 462                 if (!file->basename || !S_ISDIR(file->mode)) continue;
 463                 recv_generator(f_name(file),flist,i,-1);
 464         }
 465
 466         if (verbose > 2)
 467                 rprintf(FINFO,"recv_files finished\n");
 468
 469         return 0;
 470 }
 471