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 verbose;
  31 extern int am_server;
  32 extern int am_sender;
  33 extern int inplace;
  34 extern int fuzzy_basis;
  35 extern int read_batch;
  36 extern int checksum_seed;
  37 extern int basis_dir_cnt;
  38 extern int protocol_version;
  39 extern char *dest_option;
  40
  41 void setup_protocol(int f_out,int f_in)
  42 {
  43         if (remote_protocol == 0) {
  44                 if (!read_batch)
  45                         write_int(f_out, protocol_version);
  46                 remote_protocol = read_int(f_in);
  47                 if (protocol_version > remote_protocol)
  48                         protocol_version = remote_protocol;
  49         }
  50         if (read_batch && remote_protocol > protocol_version) {
  51                 rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n",
  52                         remote_protocol, protocol_version);
  53                 exit_cleanup(RERR_PROTOCOL);
  54         }
  55
  56         if (verbose > 3) {
  57                 rprintf(FINFO, "(%s) Protocol versions: remote=%d, negotiated=%d\n",
  58                         am_server? "Server" : "Client", remote_protocol, protocol_version);
  59         }
  60         if (remote_protocol < MIN_PROTOCOL_VERSION
  61          || remote_protocol > MAX_PROTOCOL_VERSION) {
  62                 rprintf(FERROR,"protocol version mismatch -- is your shell clean?\n");
  63                 rprintf(FERROR,"(see the rsync man page for an explanation)\n");
  64                 exit_cleanup(RERR_PROTOCOL);
  65         }
  66         if (remote_protocol < OLD_PROTOCOL_VERSION) {
  67                 rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n",
  68                         am_server? "Client" : "Server");
  69         }
  70         if (protocol_version < MIN_PROTOCOL_VERSION) {
  71                 rprintf(FERROR, "--protocol must be at least %d on the %s.\n",
  72                         MIN_PROTOCOL_VERSION, am_server? "Server" : "Client");
  73                 exit_cleanup(RERR_PROTOCOL);
  74         }
  75         if (protocol_version > PROTOCOL_VERSION) {
  76                 rprintf(FERROR, "--protocol must be no more than %d on the %s.\n",
  77                         PROTOCOL_VERSION, am_server? "Server" : "Client");
  78                 exit_cleanup(RERR_PROTOCOL);
  79         }
  80
  81         if (fuzzy_basis && protocol_version < 29) {
  82                 rprintf(FERROR,
  83                         "--fuzzy requires protocol 29 or higher (negotiated %d).\n",
  84                         protocol_version);
  85                 exit_cleanup(RERR_PROTOCOL);
  86         }
  87
  88         if (basis_dir_cnt && inplace && protocol_version < 29) {
  89                 rprintf(FERROR,
  90                         "%s with --inplace requires protocol 29 or higher (negotiated %d).\n",
  91                         dest_option, protocol_version);
  92                 exit_cleanup(RERR_PROTOCOL);
  93         }
  94
  95         if (basis_dir_cnt > 1 && protocol_version < 29) {
  96                 rprintf(FERROR,
  97                         "Multiple %s options requires protocol 29 or higher (negotiated %d).\n",
  98                         dest_option, protocol_version);
  99                 exit_cleanup(RERR_PROTOCOL);
 100         }
 101
 102         if (am_server) {
 103                 if (!checksum_seed)
 104                         checksum_seed = time(NULL);
 105                 write_int(f_out, checksum_seed);
 106         } else {
 107                 checksum_seed = read_int(f_in);
 108         }
 109 }