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         DEV64_T dev;
  42         INO64_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 = realloc_array(delete_list, struct delete_list,
  71                                             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,"delete_one: 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,"delete_one: rmdir %s: %s\n",
  95                                         f_name(f), strerror(errno));
  96                 } else if (verbose) {
  97                         rprintf(FINFO,"deleting directory %s\n",f_name(f));
  98                 }
  99         }
 100 }
 101
 102
 103
 104
 105 /* this deletes any files on the receiving side that are not present
 106    on the sending side. For version 1.6.4 I have changed the behaviour
 107    to match more closely what most people seem to expect of this option */
 108 void delete_files(struct file_list *flist)
 109 {
 110         struct file_list *local_file_list;
 111         int i, j;
 112         char *name;
 113         extern int module_id;
 114         extern int ignore_errors;
 115         extern int max_delete;
 116         static int deletion_count;
 117
 118         if (cvs_exclude)
 119                 add_cvs_excludes();
 120
 121         if (io_error && !(lp_ignore_errors(module_id) || ignore_errors)) {
 122                 rprintf(FINFO,"IO error encountered - skipping file deletion\n");
 123                 return;
 124         }
 125
 126         for (j=0;j<flist->count;j++) {
 127                 if (!S_ISDIR(flist->files[j]->mode) ||
 128                     !(flist->files[j]->flags & FLAG_DELETE)) continue;
 129
 130                 if (remote_version < 19 &&
 131                     delete_already_done(flist, j)) continue;
 132
 133                 name = strdup(f_name(flist->files[j]));
 134
 135                 if (!(local_file_list = send_file_list(-1,1,&name))) {
 136                         free(name);
 137                         continue;
 138                 }
 139
 140                 if (verbose > 1)
 141                         rprintf(FINFO,"deleting in %s\n", name);
 142
 143                 for (i=local_file_list->count-1;i>=0;i--) {
 144                         if (max_delete && deletion_count > max_delete) break;
 145                         if (!local_file_list->files[i]->basename) continue;
 146                         if (remote_version < 19 &&
 147                             S_ISDIR(local_file_list->files[i]->mode))
 148                                 add_delete_entry(local_file_list->files[i]);
 149                         if (-1 == flist_find(flist,local_file_list->files[i])) {
 150                                 char *f = f_name(local_file_list->files[i]);
 151                                 int k = strlen(f) - strlen(backup_suffix);
 152 /* Hi Andrew, do we really need to play with backup_suffix here? */
 153                                 if (make_backups && ((k <= 0) ||
 154                                             (strcmp(f+k,backup_suffix) != 0))) {
 155                                         (void) make_backup(f);
 156                                 } else {
 157                                         deletion_count++;
 158                                         delete_one(local_file_list->files[i]);
 159                                 }
 160                         }
 161                 }
 162                 flist_free(local_file_list);
 163                 free(name);
 164         }
 165 }
 166
 167
 168 static int get_tmpname(char *fnametmp, char *fname)
 169 {
 170         char *f;
 171
 172         /* open tmp file */
 173         if (tmpdir) {
 174                 f = strrchr(fname,'/');
 175                 if (f == NULL)
 176                         f = fname;
 177                 else
 178                         f++;
 179                 if (strlen(tmpdir)+strlen(f)+10 > MAXPATHLEN) {
 180                         rprintf(FERROR,"filename too long\n");
 181                         return 0;
 182                 }
 183                 snprintf(fnametmp,MAXPATHLEN, "%s/.%s.XXXXXX",tmpdir,f);
 184                 return 1;
 185         }
 186
 187         f = strrchr(fname,'/');
 188
 189         if (strlen(fname)+9 > MAXPATHLEN) {
 190                 rprintf(FERROR,"filename too long\n");
 191                 return 0;
 192         }
 193
 194         if (f) {
 195                 *f = 0;
 196                 snprintf(fnametmp,MAXPATHLEN,"%s/.%s.XXXXXX",
 197                          fname,f+1);
 198                 *f = '/';
 199         } else {
 200                 snprintf(fnametmp,MAXPATHLEN,".%s.XXXXXX",fname);
 201         }
 202
 203         return 1;
 204 }
 205
 206
 207 static int receive_data(int f_in,struct map_struct *buf,int fd,char *fname,
 208                         OFF_T total_size)
 209 {
 210         int i;
 211         unsigned int n,remainder,len,count;
 212         OFF_T offset = 0;
 213         OFF_T offset2;
 214         char *data;
 215         static char file_sum1[MD4_SUM_LENGTH];
 216         static char file_sum2[MD4_SUM_LENGTH];
 217         char *map=NULL;
 218
 219         count = read_int(f_in);
 220         n = read_int(f_in);
 221         remainder = read_int(f_in);
 222
 223         sum_init();
 224
 225         for (i=recv_token(f_in,&data); i != 0; i=recv_token(f_in,&data)) {
 226
 227                 show_progress(offset, total_size);
 228
 229                 if (i > 0) {
 230                         extern int cleanup_got_literal;
 231
 232                         if (verbose > 3) {
 233                                 rprintf(FINFO,"data recv %d at %.0f\n",
 234                                         i,(double)offset);
 235                         }
 236
 237                         stats.literal_data += i;
 238                         cleanup_got_literal = 1;
 239
 240                         sum_update(data,i);
 241
 242                         if (fd != -1 && write_file(fd,data,i) != i) {
 243                                 rprintf(FERROR,"write failed on %s : %s\n",fname,strerror(errno));
 244                                 exit_cleanup(RERR_FILEIO);
 245                         }
 246                         offset += i;
 247                         continue;
 248                 }
 249
 250                 i = -(i+1);
 251                 offset2 = i*(OFF_T)n;
 252                 len = n;
 253                 if (i == (int) count-1 && remainder != 0)
 254                         len = remainder;
 255
 256                 stats.matched_data += len;
 257
 258                 if (verbose > 3)
 259                         rprintf(FINFO,"chunk[%d] of size %d at %.0f offset=%.0f\n",
 260                                 i,len,(double)offset2,(double)offset);
 261
 262                 if (buf) {
 263                         map = map_ptr(buf,offset2,len);
 264
 265                         see_token(map, len);
 266                         sum_update(map,len);
 267                 }
 268
 269                 if (fd != -1 && write_file(fd,map,len) != (int) len) {
 270                         rprintf(FERROR,"write failed on %s : %s\n",
 271                                 fname,strerror(errno));
 272                         exit_cleanup(RERR_FILEIO);
 273                 }
 274                 offset += len;
 275         }
 276
 277         end_progress(total_size);
 278
 279         if (fd != -1 && offset > 0 && sparse_end(fd) != 0) {
 280                 rprintf(FERROR,"write failed on %s : %s\n",
 281                         fname,strerror(errno));
 282                 exit_cleanup(RERR_FILEIO);
 283         }
 284
 285         sum_end(file_sum1);
 286
 287         if (remote_version >= 14) {
 288                 read_buf(f_in,file_sum2,MD4_SUM_LENGTH);
 289                 if (verbose > 2) {
 290                         rprintf(FINFO,"got file_sum\n");
 291                 }
 292                 if (fd != -1 &&
 293                     memcmp(file_sum1,file_sum2,MD4_SUM_LENGTH) != 0) {
 294                         return 0;
 295                 }
 296         }
 297         return 1;
 298 }
 299
 300
 301 /**
 302  * main routine for receiver process.
 303  *
 304  * Receiver process runs on the same host as the generator process. */
 305 int recv_files(int f_in,struct file_list *flist,char *local_name,int f_gen)
 306 {
 307         int fd1,fd2;
 308         STRUCT_STAT st;
 309         char *fname;
 310         char template[MAXPATHLEN];
 311         char fnametmp[MAXPATHLEN];
 312         char *fnamecmp;
 313         char fnamecmpbuf[MAXPATHLEN];
 314         struct map_struct *buf;
 315         int i;
 316         struct file_struct *file;
 317         int phase=0;
 318         int recv_ok;
 319         extern struct stats stats;
 320         extern int preserve_perms;
 321         extern int delete_after;
 322         extern int orig_umask;
 323         struct stats initial_stats;
 324
 325         if (verbose > 2) {
 326                 rprintf(FINFO,"recv_files(%d) starting\n",flist->count);
 327         }
 328
 329         while (1) {
 330                 cleanup_disable();
 331
 332                 i = read_int(f_in);
 333                 if (i == -1) {
 334                         if (phase==0 && remote_version >= 13) {
 335                                 phase++;
 336                                 csum_length = SUM_LENGTH;
 337                                 if (verbose > 2)
 338                                         rprintf(FINFO,"recv_files phase=%d\n",phase);
 339                                 write_int(f_gen,-1);
 340                                 continue;
 341                         }
 342                         break;
 343                 }
 344
 345                 if (i < 0 || i >= flist->count) {
 346                         rprintf(FERROR,"Invalid file index %d in recv_files (count=%d)\n",
 347                                 i, flist->count);
 348                         exit_cleanup(RERR_PROTOCOL);
 349                 }
 350
 351                 file = flist->files[i];
 352                 fname = f_name(file);
 353
 354                 stats.num_transferred_files++;
 355                 stats.total_transferred_size += file->length;
 356
 357                 if (local_name)
 358                         fname = local_name;
 359
 360                 if (dry_run) {
 361                         if (!am_server) {
 362                                 log_transfer(file, fname);
 363                         }
 364                         continue;
 365                 }
 366
 367                 initial_stats = stats;
 368
 369                 if (verbose > 2)
 370                         rprintf(FINFO,"recv_files(%s)\n",fname);
 371
 372                 fnamecmp = fname;
 373
 374                 /* open the file */
 375                 fd1 = do_open(fnamecmp, O_RDONLY, 0);
 376
 377                 if ((fd1 == -1) && (compare_dest != NULL)) {
 378                         /* try the file at compare_dest instead */
 379                         snprintf(fnamecmpbuf,MAXPATHLEN,"%s/%s",
 380                                                 compare_dest,fname);
 381                         fnamecmp = fnamecmpbuf;
 382                         fd1 = do_open(fnamecmp, O_RDONLY, 0);
 383                 }
 384
 385                 if (fd1 != -1 && do_fstat(fd1,&st) != 0) {
 386                         rprintf(FERROR,"fstat %s : %s\n",fnamecmp,strerror(errno));
 387                         receive_data(f_in,NULL,-1,NULL,file->length);
 388                         close(fd1);
 389                         continue;
 390                 }
 391
 392                 if (fd1 != -1 && !S_ISREG(st.st_mode)) {
 393                         rprintf(FERROR,"%s : not a regular file (recv_files)\n",fnamecmp);
 394                         receive_data(f_in,NULL,-1,NULL,file->length);
 395                         close(fd1);
 396                         continue;
 397                 }
 398
 399                 if (fd1 != -1 && !preserve_perms) {
 400                         /* if the file exists already and we aren't perserving
 401                            presmissions then act as though the remote end sent
 402                            us the file permissions we already have */
 403                         file->mode = st.st_mode;
 404                 }
 405
 406                 if (fd1 != -1 && st.st_size > 0) {
 407                         buf = map_file(fd1,st.st_size);
 408                         if (verbose > 2)
 409                                 rprintf(FINFO,"recv mapped %s of size %.0f\n",fnamecmp,(double)st.st_size);
 410                 } else {
 411                         buf = NULL;
 412                 }
 413
 414                 if (!get_tmpname(fnametmp,fname)) {
 415                         if (buf) unmap_file(buf);
 416                         if (fd1 != -1) close(fd1);
 417                         continue;
 418                 }
 419
 420                 strlcpy(template, fnametmp, sizeof(template));
 421
 422                 /* we initially set the perms without the
 423                    setuid/setgid bits to ensure that there is no race
 424                    condition. They are then correctly updated after
 425                    the lchown. Thanks to snabb@epipe.fi for pointing
 426                    this out.  We also set it initially without group
 427                    access because of a similar race condition. */
 428                 fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 429
 430                 /* in most cases parent directories will already exist
 431                    because their information should have been previously
 432                    transferred, but that may not be the case with -R */
 433                 if (fd2 == -1 && relative_paths && errno == ENOENT &&
 434                     create_directory_path(fnametmp, orig_umask) == 0) {
 435                         strlcpy(fnametmp, template, sizeof(fnametmp));
 436                         fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 437                 }
 438                 if (fd2 == -1) {
 439                         rprintf(FERROR,"mkstemp %s failed: %s\n",fnametmp,strerror(errno));
 440                         receive_data(f_in,buf,-1,NULL,file->length);
 441                         if (buf) unmap_file(buf);
 442                         if (fd1 != -1) close(fd1);
 443                         continue;
 444                 }
 445
 446                 cleanup_set(fnametmp, fname, file, buf, fd1, fd2);
 447
 448                 if (!am_server) {
 449                         log_transfer(file, fname);
 450                 }
 451
 452                 /* recv file data */
 453                 recv_ok = receive_data(f_in,buf,fd2,fname,file->length);
 454
 455                 log_recv(file, &initial_stats);
 456
 457                 if (buf) unmap_file(buf);
 458                 if (fd1 != -1) {
 459                         close(fd1);
 460                 }
 461                 close(fd2);
 462
 463                 if (verbose > 2)
 464                         rprintf(FINFO,"renaming %s to %s\n",fnametmp,fname);
 465
 466                 finish_transfer(fname, fnametmp, file);
 467
 468                 cleanup_disable();
 469
 470                 if (!recv_ok) {
 471                         if (csum_length == SUM_LENGTH) {
 472                                 rprintf(FERROR,"ERROR: file corruption in %s. File changed during transfer?\n",
 473                                         fname);
 474                         } else {
 475                                 if (verbose > 1)
 476                                         rprintf(FINFO,"redoing %s(%d)\n",fname,i);
 477                                 write_int(f_gen,i);
 478                         }
 479                 }
 480         }
 481
 482         if (delete_after) {
 483                 if (recurse && delete_mode && !local_name && flist->count>0) {
 484                         delete_files(flist);
 485                 }
 486         }
 487
 488         if (preserve_hard_links)
 489                 do_hard_links();
 490
 491         /* now we need to fix any directory permissions that were
 492            modified during the transfer */
 493         for (i = 0; i < flist->count; i++) {
 494                 file = flist->files[i];
 495                 if (!file->basename || !S_ISDIR(file->mode)) continue;
 496                 recv_generator(local_name?local_name:f_name(file),flist,i,-1);
 497         }
 498
 499         if (verbose > 2)
 500                 rprintf(FINFO,"recv_files finished\n");
 501
 502         return 0;
 503 }
 504