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 /**
  21  * @file compat.c
  22  *
  23  * Compatibility routines for older rsync protocol versions.
  24  **/
  25
  26 #include "rsync.h"
  27
  28 extern int am_server;
  29
  30 extern int preserve_links;
  31 extern int preserve_perms;
  32 extern int preserve_devices;
  33 extern int preserve_uid;
  34 extern int preserve_gid;
  35 extern int preserve_times;
  36 extern int always_checksum;
  37 extern int checksum_seed;
  38
  39
  40 extern int remote_version;
  41 extern int verbose;
  42
  43 extern int read_batch;  /* dw */
  44 extern int write_batch;  /* dw */
  45
  46 void setup_protocol(int f_out,int f_in)
  47 {
  48         if (remote_version == 0) {
  49                 if (am_server) {
  50                         remote_version = read_int(f_in);
  51                         write_int(f_out,PROTOCOL_VERSION);
  52                 } else {
  53                         write_int(f_out,PROTOCOL_VERSION);
  54                         remote_version = read_int(f_in);
  55                 }
  56         }
  57
  58         if (remote_version < MIN_PROTOCOL_VERSION ||
  59             remote_version > MAX_PROTOCOL_VERSION) {
  60                 rprintf(FERROR,"protocol version mismatch - is your shell clean?\n");
  61                 rprintf(FERROR,"(see the rsync man page for an explanation)\n");
  62                 exit_cleanup(RERR_PROTOCOL);
  63         }
  64         if (remote_version < OLD_PROTOCOL_VERSION)
  65                 rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n",
  66                         am_server ? "Server" : "Client");
  67
  68         if (remote_version >= 12) {
  69                 if (am_server) {
  70                     if (read_batch || write_batch) /* dw */
  71                         checksum_seed = 32761;
  72                     else
  73                         checksum_seed = time(NULL);
  74                         write_int(f_out,checksum_seed);
  75                 } else {
  76                         checksum_seed = read_int(f_in);
  77                 }
  78         }
  79
  80         checksum_init();
  81 }
  82