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 protocol_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 int do_progress;
  39 extern char *backup_dir;
  40 extern char *backup_suffix;
  41 extern int backup_suffix_len;
  42
  43 static struct delete_list {
  44         DEV64_T dev;
  45         INO64_T inode;
  46 } *delete_list;
  47 static int dlist_len, dlist_alloc_len;
  48
  49 /* yuck! This function wouldn't have been necessary if I had the sorting
  50  * algorithm right. Unfortunately fixing the sorting algorithm would introduce
  51  * a backward incompatibility as file list indexes are sent over the link.
  52  */
  53 static int delete_already_done(struct file_list *flist,int j)
  54 {
  55         int i;
  56         STRUCT_STAT st;
  57
  58         if (link_stat(f_name(flist->files[j]), &st)) return 1;
  59
  60         for (i = 0; i < dlist_len; i++) {
  61                 if (st.st_ino == delete_list[i].inode &&
  62                     (DEV64_T)st.st_dev == delete_list[i].dev)
  63                         return 1;
  64         }
  65
  66         return 0;
  67 }
  68
  69 static void add_delete_entry(struct file_struct *file)
  70 {
  71         if (dlist_len == dlist_alloc_len) {
  72                 dlist_alloc_len += 1024;
  73                 delete_list = realloc_array(delete_list, struct delete_list,
  74                                             dlist_alloc_len);
  75                 if (!delete_list) out_of_memory("add_delete_entry");
  76         }
  77
  78         delete_list[dlist_len].dev = file->dev;
  79         delete_list[dlist_len].inode = file->inode;
  80         dlist_len++;
  81
  82         if (verbose > 3)
  83                 rprintf(FINFO,"added %s to delete list\n", f_name(file));
  84 }
  85
  86 static void delete_one(char *fn, int is_dir)
  87 {
  88         if (!is_dir) {
  89                 if (robust_unlink(fn) != 0) {
  90                         rprintf(FERROR, "delete_one: unlink %s failed: %s\n",
  91                                 full_fname(fn), strerror(errno));
  92                 } else if (verbose) {
  93                         rprintf(FINFO, "deleting %s\n", fn);
  94                 }
  95         } else {
  96                 if (do_rmdir(fn) != 0) {
  97                         if (errno != ENOTEMPTY && errno != EEXIST) {
  98                                 rprintf(FERROR, "delete_one: rmdir %s failed: %s\n",
  99                                         full_fname(fn), strerror(errno));
 100                         }
 101                 } else if (verbose) {
 102                         rprintf(FINFO, "deleting directory %s\n", fn);
 103                 }
 104         }
 105 }
 106
 107
 108 static int is_backup_file(char *fn)
 109 {
 110         int k = strlen(fn) - backup_suffix_len;
 111         return k > 0 && strcmp(fn+k, backup_suffix) == 0;
 112 }
 113
 114
 115 /* this deletes any files on the receiving side that are not present
 116  * on the sending side. For version 1.6.4 I have changed the behaviour
 117  * to match more closely what most people seem to expect of this option */
 118 void delete_files(struct file_list *flist)
 119 {
 120         struct file_list *local_file_list;
 121         int i, j;
 122         char *name, fbuf[MAXPATHLEN];
 123         extern int module_id;
 124         extern int ignore_errors;
 125         extern int max_delete;
 126         static int deletion_count;
 127
 128         if (cvs_exclude)
 129                 add_cvs_excludes();
 130
 131         if (io_error && !(lp_ignore_errors(module_id) || ignore_errors)) {
 132                 rprintf(FINFO,"IO error encountered - skipping file deletion\n");
 133                 return;
 134         }
 135
 136         for (j = 0;j < flist->count; j++) {
 137                 if (!S_ISDIR(flist->files[j]->mode) ||
 138                     !(flist->files[j]->flags & FLAG_DELETE)) continue;
 139
 140                 if (protocol_version < 19 &&
 141                     delete_already_done(flist, j)) continue;
 142
 143                 name = f_name_to(flist->files[j], fbuf, sizeof fbuf);
 144
 145                 if (!(local_file_list = send_file_list(-1,1,&name)))
 146                         continue;
 147
 148                 if (verbose > 1)
 149                         rprintf(FINFO,"deleting in %s\n", name);
 150
 151                 for (i = local_file_list->count-1; i >= 0; i--) {
 152                         if (max_delete && deletion_count > max_delete) break;
 153                         if (!local_file_list->files[i]->basename) continue;
 154                         if (protocol_version < 19 &&
 155                             S_ISDIR(local_file_list->files[i]->mode))
 156                                 add_delete_entry(local_file_list->files[i]);
 157                         if (-1 == flist_find(flist,local_file_list->files[i])) {
 158                                 char *f = f_name(local_file_list->files[i]);
 159                                 if (make_backups && (backup_dir || !is_backup_file(f))) {
 160                                         (void) make_backup(f);
 161                                         if (verbose)
 162                                                 rprintf(FINFO, "deleting %s\n", f);
 163                                 } else {
 164                                         int mode = local_file_list->files[i]->mode;
 165                                         delete_one(f, S_ISDIR(mode) != 0);
 166                                 }
 167                                 deletion_count++;
 168                         }
 169                 }
 170                 flist_free(local_file_list);
 171         }
 172 }
 173
 174
 175 /*
 176  * get_tmpname() - create a tmp filename for a given filename
 177  *
 178  *   If a tmpdir is defined, use that as the directory to
 179  *   put it in.  Otherwise, the tmp filename is in the same
 180  *   directory as the given name.  Note that there may be no
 181  *   directory at all in the given name!
 182  *
 183  *   The tmp filename is basically the given filename with a
 184  *   dot prepended, and .XXXXXX appended (for mkstemp() to
 185  *   put its unique gunk in).  Take care to not exceed
 186  *   either the MAXPATHLEN or NAME_MAX, esp. the last, as
 187  *   the basename basically becomes 8 chars longer. In that
 188  *   case, the original name is shortened sufficiently to
 189  *   make it all fit.
 190  *
 191  *   Of course, there's no real reason for the tmp name to
 192  *   look like the original, except to satisfy us humans.
 193  *   As long as it's unique, rsync will work.
 194  */
 195
 196 static int get_tmpname(char *fnametmp, char *fname)
 197 {
 198         char *f;
 199         int     length = 0;
 200         int     maxname;
 201
 202         if (tmpdir) {
 203                 strlcpy(fnametmp, tmpdir, MAXPATHLEN - 2);
 204                 length = strlen(fnametmp);
 205                 fnametmp[length++] = '/';
 206                 fnametmp[length] = '\0';        /* always NULL terminated */
 207         }
 208
 209         if ((f = strrchr(fname, '/')) != NULL) {
 210                 ++f;
 211                 if (!tmpdir) {
 212                         length = f - fname;
 213                         /* copy up to and including the slash */
 214                         strlcpy(fnametmp, fname, length + 1);
 215                 }
 216         } else
 217                 f = fname;
 218         fnametmp[length++] = '.';
 219         fnametmp[length] = '\0';                /* always NULL terminated */
 220
 221         maxname = MIN(MAXPATHLEN - 7 - length, NAME_MAX - 8);
 222
 223         if (maxname < 1) {
 224                 rprintf(FERROR, "temporary filename too long: %s\n", fname);
 225                 fnametmp[0] = '\0';
 226                 return 0;
 227         }
 228
 229         strlcpy(fnametmp + length, f, maxname);
 230         strcat(fnametmp + length, ".XXXXXX");
 231
 232         return 1;
 233 }
 234
 235
 236 static int receive_data(int f_in,struct map_struct *mapbuf,int fd,char *fname,
 237                         OFF_T total_size)
 238 {
 239         int i;
 240         struct sum_struct sum;
 241         unsigned int len;
 242         OFF_T offset = 0;
 243         OFF_T offset2;
 244         char *data;
 245         static char file_sum1[MD4_SUM_LENGTH];
 246         static char file_sum2[MD4_SUM_LENGTH];
 247         char *map=NULL;
 248
 249         read_sum_head(f_in, &sum);
 250
 251         sum_init();
 252
 253         for (i=recv_token(f_in,&data); i != 0; i=recv_token(f_in,&data)) {
 254                 if (do_progress)
 255                         show_progress(offset, total_size);
 256
 257                 if (i > 0) {
 258                         extern int cleanup_got_literal;
 259
 260                         if (verbose > 3) {
 261                                 rprintf(FINFO,"data recv %d at %.0f\n",
 262                                         i,(double)offset);
 263                         }
 264
 265                         stats.literal_data += i;
 266                         cleanup_got_literal = 1;
 267
 268                         sum_update(data,i);
 269
 270                         if (fd != -1 && write_file(fd,data,i) != i) {
 271                                 rprintf(FERROR, "write failed on %s: %s\n",
 272                                         full_fname(fname), strerror(errno));
 273                                 exit_cleanup(RERR_FILEIO);
 274                         }
 275                         offset += i;
 276                         continue;
 277                 }
 278
 279                 i = -(i+1);
 280                 offset2 = i*(OFF_T)sum.blength;
 281                 len = sum.blength;
 282                 if (i == (int) sum.count-1 && sum.remainder != 0)
 283                         len = sum.remainder;
 284
 285                 stats.matched_data += len;
 286
 287                 if (verbose > 3)
 288                         rprintf(FINFO,"chunk[%d] of size %d at %.0f offset=%.0f\n",
 289                                 i,len,(double)offset2,(double)offset);
 290
 291                 if (mapbuf) {
 292                         map = map_ptr(mapbuf,offset2,len);
 293
 294                         see_token(map, len);
 295                         sum_update(map,len);
 296                 }
 297
 298                 if (fd != -1 && write_file(fd,map,len) != (int) len) {
 299                         rprintf(FERROR, "write failed on %s: %s\n",
 300                                 full_fname(fname), strerror(errno));
 301                         exit_cleanup(RERR_FILEIO);
 302                 }
 303                 offset += len;
 304         }
 305
 306         if (do_progress)
 307                 end_progress(total_size);
 308
 309         if (fd != -1 && offset > 0 && sparse_end(fd) != 0) {
 310                 rprintf(FERROR, "write failed on %s: %s\n",
 311                         full_fname(fname), strerror(errno));
 312                 exit_cleanup(RERR_FILEIO);
 313         }
 314
 315         sum_end(file_sum1);
 316
 317         read_buf(f_in,file_sum2,MD4_SUM_LENGTH);
 318         if (verbose > 2) {
 319                 rprintf(FINFO,"got file_sum\n");
 320         }
 321         if (fd != -1 && memcmp(file_sum1,file_sum2,MD4_SUM_LENGTH) != 0) {
 322                 return 0;
 323         }
 324         return 1;
 325 }
 326
 327
 328 /**
 329  * main routine for receiver process.
 330  *
 331  * Receiver process runs on the same host as the generator process. */
 332 int recv_files(int f_in,struct file_list *flist,char *local_name,int f_gen)
 333 {
 334         int fd1,fd2;
 335         STRUCT_STAT st;
 336         char *fname, fbuf[MAXPATHLEN];
 337         char template[MAXPATHLEN];
 338         char fnametmp[MAXPATHLEN];
 339         char *fnamecmp;
 340         char fnamecmpbuf[MAXPATHLEN];
 341         struct map_struct *mapbuf;
 342         int i;
 343         struct file_struct *file;
 344         int phase=0;
 345         int recv_ok;
 346         extern struct stats stats;
 347         extern int preserve_perms;
 348         extern int delete_after;
 349         extern int orig_umask;
 350         struct stats initial_stats;
 351
 352         if (verbose > 2) {
 353                 rprintf(FINFO,"recv_files(%d) starting\n",flist->count);
 354         }
 355
 356         while (1) {
 357                 cleanup_disable();
 358
 359                 i = read_int(f_in);
 360                 if (i == -1) {
 361                         if (phase==0) {
 362                                 phase++;
 363                                 csum_length = SUM_LENGTH;
 364                                 if (verbose > 2)
 365                                         rprintf(FINFO,"recv_files phase=%d\n",phase);
 366                                 write_int(f_gen,-1);
 367                                 continue;
 368                         }
 369                         break;
 370                 }
 371
 372                 if (i < 0 || i >= flist->count) {
 373                         rprintf(FERROR,"Invalid file index %d in recv_files (count=%d)\n",
 374                                 i, flist->count);
 375                         exit_cleanup(RERR_PROTOCOL);
 376                 }
 377
 378                 file = flist->files[i];
 379
 380                 stats.num_transferred_files++;
 381                 stats.total_transferred_size += file->length;
 382
 383                 if (local_name)
 384                         fname = local_name;
 385                 else
 386                         fname = f_name_to(file, fbuf, sizeof fbuf);
 387
 388                 if (dry_run) {
 389                         if (!am_server && verbose) {    /* log transfer */
 390                                 rprintf(FINFO, "%s\n", fname);
 391                         }
 392                         continue;
 393                 }
 394
 395                 initial_stats = stats;
 396
 397                 if (verbose > 2)
 398                         rprintf(FINFO,"recv_files(%s)\n",fname);
 399
 400                 fnamecmp = fname;
 401
 402                 /* open the file */
 403                 fd1 = do_open(fnamecmp, O_RDONLY, 0);
 404
 405                 if ((fd1 == -1) && (compare_dest != NULL)) {
 406                         /* try the file at compare_dest instead */
 407                         snprintf(fnamecmpbuf,MAXPATHLEN,"%s/%s",
 408                                                 compare_dest,fname);
 409                         fnamecmp = fnamecmpbuf;
 410                         fd1 = do_open(fnamecmp, O_RDONLY, 0);
 411                 }
 412
 413                 if (fd1 != -1 && do_fstat(fd1,&st) != 0) {
 414                         rprintf(FERROR, "fstat %s failed: %s\n",
 415                                 full_fname(fnamecmp), strerror(errno));
 416                         receive_data(f_in,NULL,-1,NULL,file->length);
 417                         close(fd1);
 418                         continue;
 419                 }
 420
 421                 if (fd1 != -1 && S_ISDIR(st.st_mode) && fnamecmp == fname) {
 422                         /* this special handling for directories
 423                          * wouldn't be necessary if robust_rename()
 424                          * and the underlying robust_unlink could cope
 425                          * with directories
 426                          */
 427                         rprintf(FERROR,"recv_files: %s is a directory\n",
 428                                 full_fname(fnamecmp));
 429                         receive_data(f_in, NULL, -1, NULL, file->length);
 430                         close(fd1);
 431                         continue;
 432                 }
 433
 434                 if (fd1 != -1 && !S_ISREG(st.st_mode)) {
 435                         close(fd1);
 436                         fd1 = -1;
 437                         mapbuf = NULL;
 438                 }
 439
 440                 if (fd1 != -1 && !preserve_perms) {
 441                         /* if the file exists already and we aren't preserving
 442                          * permissions then act as though the remote end sent
 443                          * us the file permissions we already have */
 444                         file->mode = st.st_mode;
 445                 }
 446
 447                 if (fd1 != -1 && st.st_size > 0) {
 448                         mapbuf = map_file(fd1,st.st_size);
 449                         if (verbose > 2)
 450                                 rprintf(FINFO,"recv mapped %s of size %.0f\n",fnamecmp,(double)st.st_size);
 451                 } else
 452                         mapbuf = NULL;
 453
 454                 if (!get_tmpname(fnametmp,fname)) {
 455                         if (mapbuf) unmap_file(mapbuf);
 456                         if (fd1 != -1) close(fd1);
 457                         continue;
 458                 }
 459
 460                 strlcpy(template, fnametmp, sizeof(template));
 461
 462                 /* we initially set the perms without the
 463                  * setuid/setgid bits to ensure that there is no race
 464                  * condition. They are then correctly updated after
 465                  * the lchown. Thanks to snabb@epipe.fi for pointing
 466                  * this out.  We also set it initially without group
 467                  * access because of a similar race condition. */
 468                 fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 469
 470                 /* in most cases parent directories will already exist
 471                  * because their information should have been previously
 472                  * transferred, but that may not be the case with -R */
 473                 if (fd2 == -1 && relative_paths && errno == ENOENT &&
 474                     create_directory_path(fnametmp, orig_umask) == 0) {
 475                         strlcpy(fnametmp, template, sizeof(fnametmp));
 476                         fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 477                 }
 478                 if (fd2 == -1) {
 479                         rprintf(FERROR, "mkstemp %s failed: %s\n",
 480                                 full_fname(fnametmp), strerror(errno));
 481                         receive_data(f_in,mapbuf,-1,NULL,file->length);
 482                         if (mapbuf) unmap_file(mapbuf);
 483                         if (fd1 != -1) close(fd1);
 484                         continue;
 485                 }
 486
 487                 cleanup_set(fnametmp, fname, file, mapbuf, fd1, fd2);
 488
 489                 if (!am_server && verbose) {    /* log transfer */
 490                         rprintf(FINFO, "%s\n", fname);
 491                 }
 492
 493                 /* recv file data */
 494                 recv_ok = receive_data(f_in,mapbuf,fd2,fname,file->length);
 495
 496                 log_recv(file, &initial_stats);
 497
 498                 if (mapbuf) unmap_file(mapbuf);
 499                 if (fd1 != -1) {
 500                         close(fd1);
 501                 }
 502                 close(fd2);
 503
 504                 if (verbose > 2)
 505                         rprintf(FINFO,"renaming %s to %s\n",fnametmp,fname);
 506
 507                 finish_transfer(fname, fnametmp, file);
 508
 509                 cleanup_disable();
 510
 511                 if (!recv_ok) {
 512                         if (csum_length == SUM_LENGTH) {
 513                                 rprintf(FERROR,"ERROR: file corruption in %s. File changed during transfer?\n",
 514                                         full_fname(fname));
 515                         } else {
 516                                 if (verbose > 1)
 517                                         rprintf(FINFO,"redoing %s(%d)\n",fname,i);
 518                                 write_int(f_gen,i);
 519                         }
 520                 }
 521         }
 522
 523         if (delete_after) {
 524                 if (recurse && delete_mode && !local_name && flist->count>0) {
 525                         delete_files(flist);
 526                 }
 527         }
 528
 529         if (preserve_hard_links)
 530                 do_hard_links();
 531
 532         /* now we need to fix any directory permissions that were
 533          * modified during the transfer */
 534         for (i = 0; i < flist->count; i++) {
 535                 file = flist->files[i];
 536                 if (!file->basename || !S_ISDIR(file->mode)) continue;
 537                 recv_generator(local_name? local_name
 538                              : f_name_to(file,fbuf,sizeof fbuf), flist, i, -1);
 539         }
 540
 541         if (verbose > 2)
 542                 rprintf(FINFO,"recv_files finished\n");
 543
 544         return 0;
 545 }