compat.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 /* compatability routines for older rsync protocol versions */
  21
  22 #include "rsync.h"
  23
  24 extern int am_server;
  25
  26 extern int preserve_links;
  27 extern int preserve_perms;
  28 extern int preserve_devices;
  29 extern int preserve_uid;
  30 extern int preserve_gid;
  31 extern int preserve_times;
  32 extern int always_checksum;
  33 extern int checksum_seed;
  34
  35
  36 extern int remote_version;
  37 extern int verbose;
  38
  39 void setup_protocol(int f_out,int f_in)
  40 {
  41         if (remote_version == 0) {
  42                 if (am_server) {
  43                         remote_version = read_int(f_in);
  44                         write_int(f_out,PROTOCOL_VERSION);
  45                 } else {
  46                         write_int(f_out,PROTOCOL_VERSION);
  47                         remote_version = read_int(f_in);
  48                 }
  49         }
  50
  51         if (remote_version < MIN_PROTOCOL_VERSION ||
  52             remote_version > MAX_PROTOCOL_VERSION) {
  53                 rprintf(FERROR,"protocol version mismatch - is your shell clean?\n");
  54                 rprintf(FERROR,"(see the rsync man page for an explanation)\n");
  55                 exit_cleanup(RERR_PROTOCOL);
  56         }
  57
  58         if (verbose > 2)
  59                 rprintf(FINFO, "local_version=%d remote_version=%d\n",
  60                         PROTOCOL_VERSION, remote_version);
  61
  62         if (remote_version >= 12) {
  63                 if (am_server) {
  64                         checksum_seed = time(NULL);
  65                         write_int(f_out,checksum_seed);
  66                 } else {
  67                         checksum_seed = read_int(f_in);
  68                 }
  69         }
  70
  71         checksum_init();
  72 }
  73