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 int remote_protocol = 0;
  29
  30 extern int am_server;
  31
  32 extern int preserve_links;
  33 extern int preserve_perms;
  34 extern int preserve_devices;
  35 extern int preserve_uid;
  36 extern int preserve_gid;
  37 extern int preserve_times;
  38 extern int always_checksum;
  39 extern int checksum_seed;
  40
  41
  42 extern int protocol_version;
  43 extern int verbose;
  44
  45 extern int read_batch;
  46 extern int write_batch;
  47
  48 void setup_protocol(int f_out,int f_in)
  49 {
  50         if (remote_protocol == 0) {
  51                 if (am_server) {
  52                         remote_protocol = read_int(f_in);
  53                         write_int(f_out, protocol_version);
  54                 } else {
  55                         write_int(f_out, protocol_version);
  56                         remote_protocol = read_int(f_in);
  57                 }
  58                 if (protocol_version > remote_protocol)
  59                         protocol_version = remote_protocol;
  60         }
  61
  62         if (verbose > 3) {
  63                 rprintf(FINFO, "(%s) Protocol versions: remote=%d, negotiated=%d\n",
  64                         am_server? "Server" : "Client", remote_protocol, protocol_version);
  65         }
  66         if (remote_protocol < MIN_PROTOCOL_VERSION
  67          || remote_protocol > MAX_PROTOCOL_VERSION) {
  68                 rprintf(FERROR,"protocol version mismatch - is your shell clean?\n");
  69                 rprintf(FERROR,"(see the rsync man page for an explanation)\n");
  70                 exit_cleanup(RERR_PROTOCOL);
  71         }
  72         if (remote_protocol < OLD_PROTOCOL_VERSION) {
  73                 rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n",
  74                         am_server? "Client" : "Server");
  75         }
  76         if (protocol_version < MIN_PROTOCOL_VERSION) {
  77                 rprintf(FERROR, "--protocol must be at least %d on the %s.\n",
  78                         MIN_PROTOCOL_VERSION, am_server? "Server" : "Client");
  79                 exit_cleanup(RERR_PROTOCOL);
  80         }
  81         if (protocol_version > PROTOCOL_VERSION) {
  82                 rprintf(FERROR, "--protocol must be no more than %d on the %s.\n",
  83                         PROTOCOL_VERSION, am_server? "Server" : "Client");
  84                 exit_cleanup(RERR_PROTOCOL);
  85         }
  86
  87         if (am_server) {
  88                 if (read_batch || write_batch)
  89                         checksum_seed = 32761;
  90                 else
  91                         checksum_seed = time(NULL);
  92                 write_int(f_out,checksum_seed);
  93         } else {
  94                 checksum_seed = read_int(f_in);
  95         }
  96 }