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 = (struct delete_list *)Realloc(delete_list, sizeof(delete_list[0])*dlist_alloc_len);
  74                 if (!delete_list) out_of_memory("add_delete_entry");
  75         }
  76
  77         delete_list[dlist_len].dev = file->dev;
  78         delete_list[dlist_len].inode = file->inode;
  79         dlist_len++;
  80
  81         if (verbose > 3)
  82                 rprintf(FINFO,"added %s to delete list\n", f_name(file));
  83 }
  84
  85 static void delete_one(char *fn, int is_dir)
  86 {
  87         if (!is_dir) {
  88                 if (robust_unlink(fn) != 0) {
  89                         rprintf(FERROR, "delete_one: unlink %s failed: %s\n",
  90                                 full_fname(fn), strerror(errno));
  91                 } else if (verbose) {
  92                         rprintf(FINFO, "deleting %s\n", fn);
  93                 }
  94         } else {
  95                 if (do_rmdir(fn) != 0) {
  96                         if (errno != ENOTEMPTY && errno != EEXIST) {
  97                                 rprintf(FERROR, "delete_one: rmdir %s failed: %s\n",
  98                                         full_fname(fn), strerror(errno));
  99                         }
 100                 } else if (verbose) {
 101                         rprintf(FINFO, "deleting directory %s\n", fn);
 102                 }
 103         }
 104 }
 105
 106
 107 static int is_backup_file(char *fn)
 108 {
 109         int k = strlen(fn) - backup_suffix_len;
 110         return k > 0 && strcmp(fn+k, backup_suffix) == 0;
 111 }
 112
 113
 114 /* this deletes any files on the receiving side that are not present
 115    on the sending side. For version 1.6.4 I have changed the behaviour
 116    to match more closely what most people seem to expect of this option */
 117 void delete_files(struct file_list *flist)
 118 {
 119         struct file_list *local_file_list;
 120         int i, j;
 121         char *name;
 122         extern int module_id;
 123         extern int ignore_errors;
 124         extern int max_delete;
 125         static int deletion_count;
 126
 127         if (cvs_exclude)
 128                 add_cvs_excludes();
 129
 130         if (io_error && !(lp_ignore_errors(module_id) || ignore_errors)) {
 131                 rprintf(FINFO,"IO error encountered - skipping file deletion\n");
 132                 return;
 133         }
 134
 135         for (j=0;j<flist->count;j++) {
 136                 if (!S_ISDIR(flist->files[j]->mode) ||
 137                     !(flist->files[j]->flags & FLAG_DELETE)) continue;
 138
 139                 if (protocol_version < 19 &&
 140                     delete_already_done(flist, j)) continue;
 141
 142                 name = strdup(f_name(flist->files[j]));
 143
 144                 if (!(local_file_list = send_file_list(-1,1,&name))) {
 145                         free(name);
 146                         continue;
 147                 }
 148
 149                 if (verbose > 1)
 150                         rprintf(FINFO,"deleting in %s\n", name);
 151
 152                 for (i=local_file_list->count-1;i>=0;i--) {
 153                         if (max_delete && deletion_count > max_delete) break;
 154                         if (!local_file_list->files[i]->basename) continue;
 155                         if (protocol_version < 19 &&
 156                             S_ISDIR(local_file_list->files[i]->mode))
 157                                 add_delete_entry(local_file_list->files[i]);
 158                         if (-1 == flist_find(flist,local_file_list->files[i])) {
 159                                 char *f = f_name(local_file_list->files[i]);
 160                                 if (make_backups && (backup_dir || !is_backup_file(f))) {
 161                                         (void) make_backup(f);
 162                                         if (verbose)
 163                                                 rprintf(FINFO, "deleting %s\n", f);
 164                                 } else {
 165                                         int mode = local_file_list->files[i]->mode;
 166                                         delete_one(f, S_ISDIR(mode) != 0);
 167                                 }
 168                                 deletion_count++;
 169                         }
 170                 }
 171                 flist_free(local_file_list);
 172                 free(name);
 173         }
 174 }
 175
 176
 177 /*
 178  * get_tmpname() - create a tmp filename for a given filename
 179  *
 180  *   If a tmpdir is defined, use that as the directory to
 181  *   put it in.  Otherwise, the tmp filename is in the same
 182  *   directory as the given name.  Note that there may be no
 183  *   directory at all in the given name!
 184  *
 185  *   The tmp filename is basically the given filename with a
 186  *   dot prepended, and .XXXXXX appended (for mkstemp() to
 187  *   put its unique gunk in).  Take care to not exceed
 188  *   either the MAXPATHLEN or NAME_MAX, esp. the last, as
 189  *   the basename basically becomes 8 chars longer. In that
 190  *   case, the original name is shortened sufficiently to
 191  *   make it all fit.
 192  *
 193  *   Of course, there's no real reason for the tmp name to
 194  *   look like the original, except to satisfy us humans.
 195  *   As long as it's unique, rsync will work.
 196  */
 197
 198 static int get_tmpname(char *fnametmp, char *fname)
 199 {
 200         char *f;
 201         int     length = 0;
 202         int     maxname;
 203
 204         if (tmpdir) {
 205                 strlcpy(fnametmp, tmpdir, MAXPATHLEN - 2);
 206                 length = strlen(fnametmp);
 207                 fnametmp[length++] = '/';
 208                 fnametmp[length] = '\0';        /* always NULL terminated */
 209         }
 210
 211         if ((f = strrchr(fname, '/')) != NULL) {
 212                 ++f;
 213                 if (!tmpdir) {
 214                         length = f - fname;
 215                         /* copy up to and including the slash */
 216                         strlcpy(fnametmp, fname, length + 1);
 217                 }
 218         } else {
 219                 f = fname;
 220         }
 221         fnametmp[length++] = '.';
 222         fnametmp[length] = '\0';                /* always NULL terminated */
 223
 224         maxname = MIN(MAXPATHLEN - 7 - length, NAME_MAX - 8);
 225
 226         if (maxname < 1) {
 227                 rprintf(FERROR, "temporary filename too long: %s\n", fname);
 228                 fnametmp[0] = '\0';
 229                 return 0;
 230         }
 231
 232         strlcpy(fnametmp + length, f, maxname);
 233         strcat(fnametmp + length, ".XXXXXX");
 234
 235         return 1;
 236 }
 237
 238
 239 static int receive_data(int f_in,struct map_struct *buf,int fd,char *fname,
 240                         OFF_T total_size)
 241 {
 242         int i;
 243         struct sum_struct sum;
 244         unsigned int len;
 245         OFF_T offset = 0;
 246         OFF_T offset2;
 247         char *data;
 248         static char file_sum1[MD4_SUM_LENGTH];
 249         static char file_sum2[MD4_SUM_LENGTH];
 250         char *map=NULL;
 251
 252         read_sum_head(f_in, &sum);
 253
 254         sum_init();
 255
 256         for (i=recv_token(f_in,&data); i != 0; i=recv_token(f_in,&data)) {
 257                 if (do_progress)
 258                         show_progress(offset, total_size);
 259
 260                 if (i > 0) {
 261                         extern int cleanup_got_literal;
 262
 263                         if (verbose > 3) {
 264                                 rprintf(FINFO,"data recv %d at %.0f\n",
 265                                         i,(double)offset);
 266                         }
 267
 268                         stats.literal_data += i;
 269                         cleanup_got_literal = 1;
 270
 271                         sum_update(data,i);
 272
 273                         if (fd != -1 && write_file(fd,data,i) != i) {
 274                                 rprintf(FERROR, "write failed on %s: %s\n",
 275                                         full_fname(fname), strerror(errno));
 276                                 exit_cleanup(RERR_FILEIO);
 277                         }
 278                         offset += i;
 279                         continue;
 280                 }
 281
 282                 i = -(i+1);
 283                 offset2 = i*(OFF_T)sum.blength;
 284                 len = sum.blength;
 285                 if (i == (int) sum.count-1 && sum.remainder != 0)
 286                         len = sum.remainder;
 287
 288                 stats.matched_data += len;
 289
 290                 if (verbose > 3)
 291                         rprintf(FINFO,"chunk[%d] of size %d at %.0f offset=%.0f\n",
 292                                 i,len,(double)offset2,(double)offset);
 293
 294                 if (buf) {
 295                         map = map_ptr(buf,offset2,len);
 296
 297                         see_token(map, len);
 298                         sum_update(map,len);
 299                 }
 300
 301                 if (fd != -1 && write_file(fd,map,len) != (int) len) {
 302                         rprintf(FERROR, "write failed on %s: %s\n",
 303                                 full_fname(fname), strerror(errno));
 304                         exit_cleanup(RERR_FILEIO);
 305                 }
 306                 offset += len;
 307         }
 308
 309         if (do_progress)
 310                 end_progress(total_size);
 311
 312         if (fd != -1 && offset > 0 && sparse_end(fd) != 0) {
 313                 rprintf(FERROR, "write failed on %s: %s\n",
 314                         full_fname(fname), strerror(errno));
 315                 exit_cleanup(RERR_FILEIO);
 316         }
 317
 318         sum_end(file_sum1);
 319
 320         read_buf(f_in,file_sum2,MD4_SUM_LENGTH);
 321         if (verbose > 2) {
 322                 rprintf(FINFO,"got file_sum\n");
 323         }
 324         if (fd != -1
 325             && memcmp(file_sum1,file_sum2,MD4_SUM_LENGTH) != 0) {
 326                 return 0;
 327         }
 328         return 1;
 329 }
 330
 331
 332 /**
 333  * main routine for receiver process.
 334  *
 335  * Receiver process runs on the same host as the generator process. */
 336 int recv_files(int f_in,struct file_list *flist,char *local_name,int f_gen)
 337 {
 338         int fd1,fd2;
 339         STRUCT_STAT st;
 340         char *fname;
 341         char template[MAXPATHLEN];
 342         char fnametmp[MAXPATHLEN];
 343         char *fnamecmp;
 344         char fnamecmpbuf[MAXPATHLEN];
 345         struct map_struct *buf;
 346         int i;
 347         struct file_struct *file;
 348         int phase=0;
 349         int recv_ok;
 350         extern struct stats stats;
 351         extern int preserve_perms;
 352         extern int delete_after;
 353         extern int orig_umask;
 354         struct stats initial_stats;
 355
 356         if (verbose > 2) {
 357                 rprintf(FINFO,"recv_files(%d) starting\n",flist->count);
 358         }
 359
 360         while (1) {
 361                 cleanup_disable();
 362
 363                 i = read_int(f_in);
 364                 if (i == -1) {
 365                         if (phase==0) {
 366                                 phase++;
 367                                 csum_length = SUM_LENGTH;
 368                                 if (verbose > 2)
 369                                         rprintf(FINFO,"recv_files phase=%d\n",phase);
 370                                 write_int(f_gen,-1);
 371                                 continue;
 372                         }
 373                         break;
 374                 }
 375
 376                 if (i < 0 || i >= flist->count) {
 377                         rprintf(FERROR,"Invalid file index %d in recv_files (count=%d)\n",
 378                                 i, flist->count);
 379                         exit_cleanup(RERR_PROTOCOL);
 380                 }
 381
 382                 file = flist->files[i];
 383                 fname = f_name(file);
 384
 385                 stats.num_transferred_files++;
 386                 stats.total_transferred_size += file->length;
 387
 388                 if (local_name)
 389                         fname = local_name;
 390
 391                 if (dry_run) {
 392                         if (!am_server && verbose) {    /* log transfer */
 393                                 rprintf(FINFO, "%s\n", fname);
 394                         }
 395                         continue;
 396                 }
 397
 398                 initial_stats = stats;
 399
 400                 if (verbose > 2)
 401                         rprintf(FINFO,"recv_files(%s)\n",fname);
 402
 403                 fnamecmp = fname;
 404
 405                 /* open the file */
 406                 fd1 = do_open(fnamecmp, O_RDONLY, 0);
 407
 408                 if ((fd1 == -1) && (compare_dest != NULL)) {
 409                         /* try the file at compare_dest instead */
 410                         snprintf(fnamecmpbuf,MAXPATHLEN,"%s/%s",
 411                                                 compare_dest,fname);
 412                         fnamecmp = fnamecmpbuf;
 413                         fd1 = do_open(fnamecmp, O_RDONLY, 0);
 414                 }
 415
 416                 if (fd1 != -1 && do_fstat(fd1,&st) != 0) {
 417                         rprintf(FERROR, "fstat %s failed: %s\n",
 418                                 full_fname(fnamecmp), strerror(errno));
 419                         receive_data(f_in,NULL,-1,NULL,file->length);
 420                         close(fd1);
 421                         continue;
 422                 }
 423
 424                 if (fd1 != -1 && S_ISDIR(st.st_mode) && fnamecmp == fname) {
 425                         /* this special handling for directories
 426                          * wouldn't be necessary if robust_rename()
 427                          * and the underlying robust_unlink could cope
 428                          * with directories
 429                          */
 430                         rprintf(FERROR,"recv_files: %s is a directory\n",
 431                                 full_fname(fnamecmp));
 432                         receive_data(f_in, NULL, -1, NULL, file->length);
 433                         close(fd1);
 434                         continue;
 435                 }
 436
 437                 if (fd1 != -1 && !S_ISREG(st.st_mode)) {
 438                         close(fd1);
 439                         fd1 = -1;
 440                         buf = NULL;
 441                 }
 442
 443                 if (fd1 != -1 && !preserve_perms) {
 444                         /* if the file exists already and we aren't preserving
 445                            permissions then act as though the remote end sent
 446                            us the file permissions we already have */
 447                         file->mode = st.st_mode;
 448                 }
 449
 450                 if (fd1 != -1 && st.st_size > 0) {
 451                         buf = map_file(fd1,st.st_size);
 452                         if (verbose > 2)
 453                                 rprintf(FINFO,"recv mapped %s of size %.0f\n",fnamecmp,(double)st.st_size);
 454                 } else {
 455                         buf = NULL;
 456                 }
 457
 458                 if (!get_tmpname(fnametmp,fname)) {
 459                         if (buf) unmap_file(buf);
 460                         if (fd1 != -1) close(fd1);
 461                         continue;
 462                 }
 463
 464                 strlcpy(template, fnametmp, sizeof(template));
 465
 466                 /* we initially set the perms without the
 467                    setuid/setgid bits to ensure that there is no race
 468                    condition. They are then correctly updated after
 469                    the lchown. Thanks to snabb@epipe.fi for pointing
 470                    this out.  We also set it initially without group
 471                    access because of a similar race condition. */
 472                 fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 473
 474                 /* in most cases parent directories will already exist
 475                    because their information should have been previously
 476                    transferred, but that may not be the case with -R */
 477                 if (fd2 == -1 && relative_paths && errno == ENOENT &&
 478                     create_directory_path(fnametmp, orig_umask) == 0) {
 479                         strlcpy(fnametmp, template, sizeof(fnametmp));
 480                         fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 481                 }
 482                 if (fd2 == -1) {
 483                         rprintf(FERROR, "mkstemp %s failed: %s\n",
 484                                 full_fname(fnametmp), strerror(errno));
 485                         receive_data(f_in,buf,-1,NULL,file->length);
 486                         if (buf) unmap_file(buf);
 487                         if (fd1 != -1) close(fd1);
 488                         continue;
 489                 }
 490
 491                 cleanup_set(fnametmp, fname, file, buf, fd1, fd2);
 492
 493                 if (!am_server && verbose) {    /* log transfer */
 494                         rprintf(FINFO, "%s\n", fname);
 495                 }
 496
 497                 /* recv file data */
 498                 recv_ok = receive_data(f_in,buf,fd2,fname,file->length);
 499
 500                 log_recv(file, &initial_stats);
 501
 502                 if (buf) unmap_file(buf);
 503                 if (fd1 != -1) {
 504                         close(fd1);
 505                 }
 506                 close(fd2);
 507
 508                 if (verbose > 2)
 509                         rprintf(FINFO,"renaming %s to %s\n",fnametmp,fname);
 510
 511                 finish_transfer(fname, fnametmp, file);
 512
 513                 cleanup_disable();
 514
 515                 if (!recv_ok) {
 516                         if (csum_length == SUM_LENGTH) {
 517                                 rprintf(FERROR,"ERROR: file corruption in %s. File changed during transfer?\n",
 518                                         full_fname(fname));
 519                         } else {
 520                                 if (verbose > 1)
 521                                         rprintf(FINFO,"redoing %s(%d)\n",fname,i);
 522                                 write_int(f_gen,i);
 523                         }
 524                 }
 525         }
 526
 527         if (delete_after) {
 528                 if (recurse && delete_mode && !local_name && flist->count>0) {
 529                         delete_files(flist);
 530                 }
 531         }
 532
 533         if (preserve_hard_links)
 534                 do_hard_links();
 535
 536         /* now we need to fix any directory permissions that were
 537            modified during the transfer */
 538         for (i = 0; i < flist->count; i++) {
 539                 file = flist->files[i];
 540                 if (!file->basename || !S_ISDIR(file->mode)) continue;
 541                 recv_generator(local_name?local_name:f_name(file),flist,i,-1);
 542         }
 543
 544         if (verbose > 2)
 545                 rprintf(FINFO,"recv_files finished\n");
 546
 547         return 0;
 548 }
 549