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;
 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 = strdup(f_name(flist->files[j]));
 144
 145                 if (!(local_file_list = send_file_list(-1,1,&name))) {
 146                         free(name);
 147                         continue;
 148                 }
 149
 150                 if (verbose > 1)
 151                         rprintf(FINFO,"deleting in %s\n", name);
 152
 153                 for (i=local_file_list->count-1;i>=0;i--) {
 154                         if (max_delete && deletion_count > max_delete) break;
 155                         if (!local_file_list->files[i]->basename) continue;
 156                         if (protocol_version < 19 &&
 157                             S_ISDIR(local_file_list->files[i]->mode))
 158                                 add_delete_entry(local_file_list->files[i]);
 159                         if (-1 == flist_find(flist,local_file_list->files[i])) {
 160                                 char *f = f_name(local_file_list->files[i]);
 161                                 if (make_backups && (backup_dir || !is_backup_file(f))) {
 162                                         (void) make_backup(f);
 163                                         if (verbose)
 164                                                 rprintf(FINFO, "deleting %s\n", f);
 165                                 } else {
 166                                         int mode = local_file_list->files[i]->mode;
 167                                         delete_one(f, S_ISDIR(mode) != 0);
 168                                 }
 169                                 deletion_count++;
 170                         }
 171                 }
 172                 flist_free(local_file_list);
 173                 free(name);
 174         }
 175 }
 176
 177
 178 /*
 179  * get_tmpname() - create a tmp filename for a given filename
 180  *
 181  *   If a tmpdir is defined, use that as the directory to
 182  *   put it in.  Otherwise, the tmp filename is in the same
 183  *   directory as the given name.  Note that there may be no
 184  *   directory at all in the given name!
 185  *
 186  *   The tmp filename is basically the given filename with a
 187  *   dot prepended, and .XXXXXX appended (for mkstemp() to
 188  *   put its unique gunk in).  Take care to not exceed
 189  *   either the MAXPATHLEN or NAME_MAX, esp. the last, as
 190  *   the basename basically becomes 8 chars longer. In that
 191  *   case, the original name is shortened sufficiently to
 192  *   make it all fit.
 193  *
 194  *   Of course, there's no real reason for the tmp name to
 195  *   look like the original, except to satisfy us humans.
 196  *   As long as it's unique, rsync will work.
 197  */
 198
 199 static int get_tmpname(char *fnametmp, char *fname)
 200 {
 201         char *f;
 202         int     length = 0;
 203         int     maxname;
 204
 205         if (tmpdir) {
 206                 strlcpy(fnametmp, tmpdir, MAXPATHLEN - 2);
 207                 length = strlen(fnametmp);
 208                 fnametmp[length++] = '/';
 209                 fnametmp[length] = '\0';        /* always NULL terminated */
 210         }
 211
 212         if ((f = strrchr(fname, '/')) != NULL) {
 213                 ++f;
 214                 if (!tmpdir) {
 215                         length = f - fname;
 216                         /* copy up to and including the slash */
 217                         strlcpy(fnametmp, fname, length + 1);
 218                 }
 219         } else {
 220                 f = fname;
 221         }
 222         fnametmp[length++] = '.';
 223         fnametmp[length] = '\0';                /* always NULL terminated */
 224
 225         maxname = MIN(MAXPATHLEN - 7 - length, NAME_MAX - 8);
 226
 227         if (maxname < 1) {
 228                 rprintf(FERROR, "temporary filename too long: %s\n", fname);
 229                 fnametmp[0] = '\0';
 230                 return 0;
 231         }
 232
 233         strlcpy(fnametmp + length, f, maxname);
 234         strcat(fnametmp + length, ".XXXXXX");
 235
 236         return 1;
 237 }
 238
 239
 240 static int receive_data(int f_in,struct map_struct *buf,int fd,char *fname,
 241                         OFF_T total_size)
 242 {
 243         int i;
 244         struct sum_struct sum;
 245         unsigned int len;
 246         OFF_T offset = 0;
 247         OFF_T offset2;
 248         char *data;
 249         static char file_sum1[MD4_SUM_LENGTH];
 250         static char file_sum2[MD4_SUM_LENGTH];
 251         char *map=NULL;
 252
 253         read_sum_head(f_in, &sum);
 254
 255         sum_init();
 256
 257         for (i=recv_token(f_in,&data); i != 0; i=recv_token(f_in,&data)) {
 258                 if (do_progress)
 259                         show_progress(offset, total_size);
 260
 261                 if (i > 0) {
 262                         extern int cleanup_got_literal;
 263
 264                         if (verbose > 3) {
 265                                 rprintf(FINFO,"data recv %d at %.0f\n",
 266                                         i,(double)offset);
 267                         }
 268
 269                         stats.literal_data += i;
 270                         cleanup_got_literal = 1;
 271
 272                         sum_update(data,i);
 273
 274                         if (fd != -1 && write_file(fd,data,i) != i) {
 275                                 rprintf(FERROR, "write failed on %s: %s\n",
 276                                         full_fname(fname), strerror(errno));
 277                                 exit_cleanup(RERR_FILEIO);
 278                         }
 279                         offset += i;
 280                         continue;
 281                 }
 282
 283                 i = -(i+1);
 284                 offset2 = i*(OFF_T)sum.blength;
 285                 len = sum.blength;
 286                 if (i == (int) sum.count-1 && sum.remainder != 0)
 287                         len = sum.remainder;
 288
 289                 stats.matched_data += len;
 290
 291                 if (verbose > 3)
 292                         rprintf(FINFO,"chunk[%d] of size %d at %.0f offset=%.0f\n",
 293                                 i,len,(double)offset2,(double)offset);
 294
 295                 if (buf) {
 296                         map = map_ptr(buf,offset2,len);
 297
 298                         see_token(map, len);
 299                         sum_update(map,len);
 300                 }
 301
 302                 if (fd != -1 && write_file(fd,map,len) != (int) len) {
 303                         rprintf(FERROR, "write failed on %s: %s\n",
 304                                 full_fname(fname), strerror(errno));
 305                         exit_cleanup(RERR_FILEIO);
 306                 }
 307                 offset += len;
 308         }
 309
 310         if (do_progress)
 311                 end_progress(total_size);
 312
 313         if (fd != -1 && offset > 0 && sparse_end(fd) != 0) {
 314                 rprintf(FERROR, "write failed on %s: %s\n",
 315                         full_fname(fname), strerror(errno));
 316                 exit_cleanup(RERR_FILEIO);
 317         }
 318
 319         sum_end(file_sum1);
 320
 321         read_buf(f_in,file_sum2,MD4_SUM_LENGTH);
 322         if (verbose > 2) {
 323                 rprintf(FINFO,"got file_sum\n");
 324         }
 325         if (fd != -1
 326             && memcmp(file_sum1,file_sum2,MD4_SUM_LENGTH) != 0) {
 327                 return 0;
 328         }
 329         return 1;
 330 }
 331
 332
 333 /**
 334  * main routine for receiver process.
 335  *
 336  * Receiver process runs on the same host as the generator process. */
 337 int recv_files(int f_in,struct file_list *flist,char *local_name,int f_gen)
 338 {
 339         int fd1,fd2;
 340         STRUCT_STAT st;
 341         char *fname;
 342         char template[MAXPATHLEN];
 343         char fnametmp[MAXPATHLEN];
 344         char *fnamecmp;
 345         char fnamecmpbuf[MAXPATHLEN];
 346         struct map_struct *buf;
 347         int i;
 348         struct file_struct *file;
 349         int phase=0;
 350         int recv_ok;
 351         extern struct stats stats;
 352         extern int preserve_perms;
 353         extern int delete_after;
 354         extern int orig_umask;
 355         struct stats initial_stats;
 356
 357         if (verbose > 2) {
 358                 rprintf(FINFO,"recv_files(%d) starting\n",flist->count);
 359         }
 360
 361         while (1) {
 362                 cleanup_disable();
 363
 364                 i = read_int(f_in);
 365                 if (i == -1) {
 366                         if (phase==0) {
 367                                 phase++;
 368                                 csum_length = SUM_LENGTH;
 369                                 if (verbose > 2)
 370                                         rprintf(FINFO,"recv_files phase=%d\n",phase);
 371                                 write_int(f_gen,-1);
 372                                 continue;
 373                         }
 374                         break;
 375                 }
 376
 377                 if (i < 0 || i >= flist->count) {
 378                         rprintf(FERROR,"Invalid file index %d in recv_files (count=%d)\n",
 379                                 i, flist->count);
 380                         exit_cleanup(RERR_PROTOCOL);
 381                 }
 382
 383                 file = flist->files[i];
 384                 fname = f_name(file);
 385
 386                 stats.num_transferred_files++;
 387                 stats.total_transferred_size += file->length;
 388
 389                 if (local_name)
 390                         fname = local_name;
 391
 392                 if (dry_run) {
 393                         if (!am_server && verbose) {    /* log transfer */
 394                                 rprintf(FINFO, "%s\n", fname);
 395                         }
 396                         continue;
 397                 }
 398
 399                 initial_stats = stats;
 400
 401                 if (verbose > 2)
 402                         rprintf(FINFO,"recv_files(%s)\n",fname);
 403
 404                 fnamecmp = fname;
 405
 406                 /* open the file */
 407                 fd1 = do_open(fnamecmp, O_RDONLY, 0);
 408
 409                 if ((fd1 == -1) && (compare_dest != NULL)) {
 410                         /* try the file at compare_dest instead */
 411                         snprintf(fnamecmpbuf,MAXPATHLEN,"%s/%s",
 412                                                 compare_dest,fname);
 413                         fnamecmp = fnamecmpbuf;
 414                         fd1 = do_open(fnamecmp, O_RDONLY, 0);
 415                 }
 416
 417                 if (fd1 != -1 && do_fstat(fd1,&st) != 0) {
 418                         rprintf(FERROR, "fstat %s failed: %s\n",
 419                                 full_fname(fnamecmp), strerror(errno));
 420                         receive_data(f_in,NULL,-1,NULL,file->length);
 421                         close(fd1);
 422                         continue;
 423                 }
 424
 425                 if (fd1 != -1 && S_ISDIR(st.st_mode) && fnamecmp == fname) {
 426                         /* this special handling for directories
 427                          * wouldn't be necessary if robust_rename()
 428                          * and the underlying robust_unlink could cope
 429                          * with directories
 430                          */
 431                         rprintf(FERROR,"recv_files: %s is a directory\n",
 432                                 full_fname(fnamecmp));
 433                         receive_data(f_in, NULL, -1, NULL, file->length);
 434                         close(fd1);
 435                         continue;
 436                 }
 437
 438                 if (fd1 != -1 && !S_ISREG(st.st_mode)) {
 439                         close(fd1);
 440                         fd1 = -1;
 441                         buf = NULL;
 442                 }
 443
 444                 if (fd1 != -1 && !preserve_perms) {
 445                         /* if the file exists already and we aren't preserving
 446                            permissions then act as though the remote end sent
 447                            us the file permissions we already have */
 448                         file->mode = st.st_mode;
 449                 }
 450
 451                 if (fd1 != -1 && st.st_size > 0) {
 452                         buf = map_file(fd1,st.st_size);
 453                         if (verbose > 2)
 454                                 rprintf(FINFO,"recv mapped %s of size %.0f\n",fnamecmp,(double)st.st_size);
 455                 } else {
 456                         buf = NULL;
 457                 }
 458
 459                 if (!get_tmpname(fnametmp,fname)) {
 460                         if (buf) unmap_file(buf);
 461                         if (fd1 != -1) close(fd1);
 462                         continue;
 463                 }
 464
 465                 strlcpy(template, fnametmp, sizeof(template));
 466
 467                 /* we initially set the perms without the
 468                    setuid/setgid bits to ensure that there is no race
 469                    condition. They are then correctly updated after
 470                    the lchown. Thanks to snabb@epipe.fi for pointing
 471                    this out.  We also set it initially without group
 472                    access because of a similar race condition. */
 473                 fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 474
 475                 /* in most cases parent directories will already exist
 476                    because their information should have been previously
 477                    transferred, but that may not be the case with -R */
 478                 if (fd2 == -1 && relative_paths && errno == ENOENT &&
 479                     create_directory_path(fnametmp, orig_umask) == 0) {
 480                         strlcpy(fnametmp, template, sizeof(fnametmp));
 481                         fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 482                 }
 483                 if (fd2 == -1) {
 484                         rprintf(FERROR, "mkstemp %s failed: %s\n",
 485                                 full_fname(fnametmp), strerror(errno));
 486                         receive_data(f_in,buf,-1,NULL,file->length);
 487                         if (buf) unmap_file(buf);
 488                         if (fd1 != -1) close(fd1);
 489                         continue;
 490                 }
 491
 492                 cleanup_set(fnametmp, fname, file, buf, fd1, fd2);
 493
 494                 if (!am_server && verbose) {    /* log transfer */
 495                         rprintf(FINFO, "%s\n", fname);
 496                 }
 497
 498                 /* recv file data */
 499                 recv_ok = receive_data(f_in,buf,fd2,fname,file->length);
 500
 501                 log_recv(file, &initial_stats);
 502
 503                 if (buf) unmap_file(buf);
 504                 if (fd1 != -1) {
 505                         close(fd1);
 506                 }
 507                 close(fd2);
 508
 509                 if (verbose > 2)
 510                         rprintf(FINFO,"renaming %s to %s\n",fnametmp,fname);
 511
 512                 finish_transfer(fname, fnametmp, file);
 513
 514                 cleanup_disable();
 515
 516                 if (!recv_ok) {
 517                         if (csum_length == SUM_LENGTH) {
 518                                 rprintf(FERROR,"ERROR: file corruption in %s. File changed during transfer?\n",
 519                                         full_fname(fname));
 520                         } else {
 521                                 if (verbose > 1)
 522                                         rprintf(FINFO,"redoing %s(%d)\n",fname,i);
 523                                 write_int(f_gen,i);
 524                         }
 525                 }
 526         }
 527
 528         if (delete_after) {
 529                 if (recurse && delete_mode && !local_name && flist->count>0) {
 530                         delete_files(flist);
 531                 }
 532         }
 533
 534         if (preserve_hard_links)
 535                 do_hard_links();
 536
 537         /* now we need to fix any directory permissions that were
 538            modified during the transfer */
 539         for (i = 0; i < flist->count; i++) {
 540                 file = flist->files[i];
 541                 if (!file->basename || !S_ISDIR(file->mode)) continue;
 542                 recv_generator(local_name?local_name:f_name(file),flist,i,-1);
 543         }
 544
 545         if (verbose > 2)
 546                 rprintf(FINFO,"recv_files finished\n");
 547
 548         return 0;
 549 }
 550