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
  36
  37 static struct delete_list {
  38         dev_t dev;
  39         INO_T inode;
  40 } *delete_list;
  41 static int dlist_len, dlist_alloc_len;
  42
  43
  44 /* yuck! This function wouldn't have been necessary if I had the sorting
  45    algorithm right. Unfortunately fixing the sorting algorithm would introduce
  46    a backward incompatibility as file list indexes are sent over the link.
  47 */
  48 static int delete_already_done(struct file_list *flist,int j)
  49 {
  50         int i;
  51         STRUCT_STAT st;
  52
  53         if (link_stat(f_name(flist->files[j]), &st)) return 1;
  54
  55         for (i=0;i<dlist_len;i++) {
  56                 if (st.st_ino == delete_list[i].inode &&
  57                     st.st_dev == delete_list[i].dev)
  58                         return 1;
  59         }
  60
  61         return 0;
  62 }
  63
  64 static void add_delete_entry(struct file_struct *file)
  65 {
  66         if (dlist_len == dlist_alloc_len) {
  67                 dlist_alloc_len += 1024;
  68                 delete_list = (struct delete_list *)Realloc(delete_list, sizeof(delete_list[0])*dlist_alloc_len);
  69                 if (!delete_list) out_of_memory("add_delete_entry");
  70         }
  71
  72         delete_list[dlist_len].dev = file->dev;
  73         delete_list[dlist_len].inode = file->inode;
  74         dlist_len++;
  75
  76         if (verbose > 3)
  77                 rprintf(FINFO,"added %s to delete list\n", f_name(file));
  78 }
  79
  80 static void delete_one(struct file_struct *f)
  81 {
  82         if (!S_ISDIR(f->mode)) {
  83                 if (do_unlink(f_name(f)) != 0) {
  84                         rprintf(FERROR,"unlink %s : %s\n",f_name(f),strerror(errno));
  85                 } else if (verbose) {
  86                         rprintf(FINFO,"deleting %s\n",f_name(f));
  87                 }
  88         } else {
  89                 if (do_rmdir(f_name(f)) != 0) {
  90                         if (errno != ENOTEMPTY && errno != EEXIST)
  91                                 rprintf(FERROR,"rmdir %s : %s\n",f_name(f),strerror(errno));
  92                 } else if (verbose) {
  93                         rprintf(FINFO,"deleting directory %s\n",f_name(f));
  94                 }
  95         }
  96 }
  97
  98
  99
 100
 101 /* this deletes any files on the receiving side that are not present
 102    on the sending side. For version 1.6.4 I have changed the behaviour
 103    to match more closely what most people seem to expect of this option */
 104 static void delete_files(struct file_list *flist)
 105 {
 106         struct file_list *local_file_list;
 107         int i, j;
 108         char *name;
 109
 110         if (cvs_exclude)
 111                 add_cvs_excludes();
 112
 113         if (io_error) {
 114                 rprintf(FINFO,"IO error encountered - skipping file deletion\n");
 115                 return;
 116         }
 117
 118         for (j=0;j<flist->count;j++) {
 119                 if (!S_ISDIR(flist->files[j]->mode) ||
 120                     !(flist->files[j]->flags & FLAG_DELETE)) continue;
 121
 122                 if (remote_version < 19 &&
 123                     delete_already_done(flist, j)) continue;
 124
 125                 name = strdup(f_name(flist->files[j]));
 126
 127                 if (!(local_file_list = send_file_list(-1,1,&name))) {
 128                         free(name);
 129                         continue;
 130                 }
 131
 132                 if (verbose > 1)
 133                         rprintf(FINFO,"deleting in %s\n", name);
 134
 135                 for (i=local_file_list->count-1;i>=0;i--) {
 136                         if (!local_file_list->files[i]->basename) continue;
 137                         if (remote_version < 19 &&
 138                             S_ISDIR(local_file_list->files[i]->mode))
 139                                 add_delete_entry(local_file_list->files[i]);
 140                         if (-1 == flist_find(flist,local_file_list->files[i])) {
 141                                 delete_one(local_file_list->files[i]);
 142                         }
 143                 }
 144                 flist_free(local_file_list);
 145                 free(name);
 146         }
 147 }
 148
 149
 150 static int get_tmpname(char *fnametmp, char *fname)
 151 {
 152         char *f;
 153
 154         /* open tmp file */
 155         if (tmpdir) {
 156                 f = strrchr(fname,'/');
 157                 if (f == NULL)
 158                         f = fname;
 159                 else
 160                         f++;
 161                 if (strlen(tmpdir)+strlen(f)+10 > MAXPATHLEN) {
 162                         rprintf(FERROR,"filename too long\n");
 163                         return 0;
 164                 }
 165                 slprintf(fnametmp,MAXPATHLEN-1, "%s/.%s.XXXXXX",tmpdir,f);
 166                 return 1;
 167         }
 168
 169         f = strrchr(fname,'/');
 170
 171         if (strlen(fname)+9 > MAXPATHLEN) {
 172                 rprintf(FERROR,"filename too long\n");
 173                 return 0;
 174         }
 175
 176         if (f) {
 177                 *f = 0;
 178                 slprintf(fnametmp,MAXPATHLEN-1,"%s/.%s.XXXXXX",
 179                          fname,f+1);
 180                 *f = '/';
 181         } else {
 182                 slprintf(fnametmp,MAXPATHLEN-1,".%s.XXXXXX",fname);
 183         }
 184
 185         return 1;
 186 }
 187
 188
 189 static int receive_data(int f_in,struct map_struct *buf,int fd,char *fname,
 190                         OFF_T total_size)
 191 {
 192         int i,n,remainder,len,count;
 193         OFF_T offset = 0;
 194         OFF_T offset2;
 195         char *data;
 196         static char file_sum1[MD4_SUM_LENGTH];
 197         static char file_sum2[MD4_SUM_LENGTH];
 198         char *map=NULL;
 199
 200         count = read_int(f_in);
 201         n = read_int(f_in);
 202         remainder = read_int(f_in);
 203
 204         sum_init();
 205
 206         for (i=recv_token(f_in,&data); i != 0; i=recv_token(f_in,&data)) {
 207
 208                 show_progress(offset, total_size);
 209
 210                 if (i > 0) {
 211                         extern int cleanup_got_literal;
 212
 213                         if (verbose > 3) {
 214                                 rprintf(FINFO,"data recv %d at %d\n",
 215                                         i,(int)offset);
 216                         }
 217
 218                         stats.literal_data += i;
 219                         cleanup_got_literal = 1;
 220
 221                         sum_update(data,i);
 222
 223                         if (fd != -1 && write_file(fd,data,i) != i) {
 224                                 rprintf(FERROR,"write failed on %s : %s\n",fname,strerror(errno));
 225                                 exit_cleanup(1);
 226                         }
 227                         offset += i;
 228                         continue;
 229                 }
 230
 231                 i = -(i+1);
 232                 offset2 = i*n;
 233                 len = n;
 234                 if (i == count-1 && remainder != 0)
 235                         len = remainder;
 236
 237                 stats.matched_data += len;
 238
 239                 if (verbose > 3)
 240                         rprintf(FINFO,"chunk[%d] of size %d at %d offset=%d\n",
 241                                 i,len,(int)offset2,(int)offset);
 242
 243                 map = map_ptr(buf,offset2,len);
 244
 245                 see_token(map, len);
 246                 sum_update(map,len);
 247
 248                 if (fd != -1 && write_file(fd,map,len) != len) {
 249                         rprintf(FERROR,"write failed on %s : %s\n",
 250                                 fname,strerror(errno));
 251                         exit_cleanup(1);
 252                 }
 253                 offset += len;
 254         }
 255
 256         end_progress();
 257
 258         if (fd != -1 && offset > 0 && sparse_end(fd) != 0) {
 259                 rprintf(FERROR,"write failed on %s : %s\n",
 260                         fname,strerror(errno));
 261                 exit_cleanup(1);
 262         }
 263
 264         sum_end(file_sum1);
 265
 266         if (remote_version >= 14) {
 267                 read_buf(f_in,file_sum2,MD4_SUM_LENGTH);
 268                 if (verbose > 2) {
 269                         rprintf(FINFO,"got file_sum\n");
 270                 }
 271                 if (fd != -1 &&
 272                     memcmp(file_sum1,file_sum2,MD4_SUM_LENGTH) != 0) {
 273                         return 0;
 274                 }
 275         }
 276         return 1;
 277 }
 278
 279
 280
 281 int recv_files(int f_in,struct file_list *flist,char *local_name,int f_gen)
 282 {
 283         int fd1,fd2;
 284         STRUCT_STAT st;
 285         char *fname;
 286         char fnametmp[MAXPATHLEN];
 287         struct map_struct *buf;
 288         int i;
 289         struct file_struct *file;
 290         int phase=0;
 291         int recv_ok;
 292
 293         if (verbose > 2) {
 294                 rprintf(FINFO,"recv_files(%d) starting\n",flist->count);
 295         }
 296
 297         if (recurse && delete_mode && !local_name && flist->count>0) {
 298                 delete_files(flist);
 299         }
 300
 301         while (1) {
 302                 cleanup_disable();
 303
 304                 i = read_int(f_in);
 305                 if (i == -1) {
 306                         if (phase==0 && remote_version >= 13) {
 307                                 phase++;
 308                                 csum_length = SUM_LENGTH;
 309                                 if (verbose > 2)
 310                                         rprintf(FINFO,"recv_files phase=%d\n",phase);
 311                                 write_int(f_gen,-1);
 312                                 continue;
 313                         }
 314                         break;
 315                 }
 316
 317                 if (i < 0 || i >= flist->count) {
 318                         rprintf(FERROR,"Invalid file index %d in recv_files (count=%d)\n",
 319                                 i, flist->count);
 320                         exit_cleanup(1);
 321                 }
 322
 323                 file = flist->files[i];
 324                 fname = f_name(file);
 325
 326                 stats.num_transferred_files++;
 327                 stats.total_transferred_size += file->length;
 328
 329                 if (local_name)
 330                         fname = local_name;
 331
 332                 if (dry_run) {
 333                         if (!am_server && verbose)
 334                                 rprintf(FINFO,"%s\n",fname);
 335                         continue;
 336                 }
 337
 338                 if (verbose > 2)
 339                         rprintf(FINFO,"recv_files(%s)\n",fname);
 340
 341                 /* open the file */
 342                 fd1 = open(fname,O_RDONLY);
 343
 344                 if (fd1 != -1 && do_fstat(fd1,&st) != 0) {
 345                         rprintf(FERROR,"fstat %s : %s\n",fname,strerror(errno));
 346                         receive_data(f_in,NULL,-1,NULL,file->length);
 347                         close(fd1);
 348                         continue;
 349                 }
 350
 351                 if (fd1 != -1 && !S_ISREG(st.st_mode)) {
 352                         rprintf(FERROR,"%s : not a regular file (recv_files)\n",fname);
 353                         receive_data(f_in,NULL,-1,NULL,file->length);
 354                         close(fd1);
 355                         continue;
 356                 }
 357
 358                 if (fd1 != -1 && st.st_size > 0) {
 359                         buf = map_file(fd1,st.st_size);
 360                         if (verbose > 2)
 361                                 rprintf(FINFO,"recv mapped %s of size %d\n",fname,(int)st.st_size);
 362                 } else {
 363                         buf = NULL;
 364                 }
 365
 366                 if (!get_tmpname(fnametmp,fname)) {
 367                         if (buf) unmap_file(buf);
 368                         if (fd1 != -1) close(fd1);
 369                         continue;
 370                 }
 371
 372                 if (NULL == do_mktemp(fnametmp)) {
 373                         rprintf(FERROR,"mktemp %s failed\n",fnametmp);
 374                         receive_data(f_in,buf,-1,NULL,file->length);
 375                         if (buf) unmap_file(buf);
 376                         if (fd1 != -1) close(fd1);
 377                         continue;
 378                 }
 379
 380                 /* we initially set the perms without the
 381                    setuid/setgid bits to ensure that there is no race
 382                    condition. They are then correctly updated after
 383                    the lchown. Thanks to snabb@epipe.fi for pointing
 384                    this out */
 385                 fd2 = do_open(fnametmp,O_WRONLY|O_CREAT|O_EXCL,
 386                               file->mode & ACCESSPERMS);
 387
 388                 if (fd2 == -1 && relative_paths && errno == ENOENT &&
 389                     create_directory_path(fnametmp) == 0) {
 390                         fd2 = do_open(fnametmp,O_WRONLY|O_CREAT|O_EXCL,
 391                                       file->mode & ACCESSPERMS);
 392                 }
 393                 if (fd2 == -1) {
 394                         rprintf(FERROR,"open %s : %s\n",fnametmp,strerror(errno));
 395                         receive_data(f_in,buf,-1,NULL,file->length);
 396                         if (buf) unmap_file(buf);
 397                         if (fd1 != -1) close(fd1);
 398                         continue;
 399                 }
 400
 401                 cleanup_set(fnametmp, fname, file);
 402
 403                 if (!am_server && verbose)
 404                         rprintf(FINFO,"%s\n",fname);
 405
 406                 /* recv file data */
 407                 recv_ok = receive_data(f_in,buf,fd2,fname,file->length);
 408
 409                 if (buf) unmap_file(buf);
 410                 if (fd1 != -1) {
 411                         close(fd1);
 412                 }
 413                 close(fd2);
 414
 415                 if (verbose > 2)
 416                         rprintf(FINFO,"renaming %s to %s\n",fnametmp,fname);
 417
 418                 finish_transfer(fname, fnametmp, file);
 419
 420                 cleanup_disable();
 421
 422                 if (!recv_ok) {
 423                         if (csum_length == SUM_LENGTH) {
 424                                 rprintf(FERROR,"ERROR: file corruption in %s. File changed during transfer?\n",
 425                                         fname);
 426                         } else {
 427                                 if (verbose > 1)
 428                                         rprintf(FINFO,"redoing %s(%d)\n",fname,i);
 429                                 write_int(f_gen,i);
 430                         }
 431                 }
 432         }
 433
 434         if (preserve_hard_links)
 435                 do_hard_links(flist);
 436
 437         /* now we need to fix any directory permissions that were
 438            modified during the transfer */
 439         for (i = 0; i < flist->count; i++) {
 440                 file = flist->files[i];
 441                 if (!file->basename || !S_ISDIR(file->mode)) continue;
 442                 recv_generator(f_name(file),flist,i,-1);
 443         }
 444
 445         if (verbose > 2)
 446                 rprintf(FINFO,"recv_files finished\n");
 447
 448         return 0;
 449 }
 450