compat.c

   1 /*
   2  * Compatibility routines for older rsync protocol versions.
   3  *
   4  * Copyright (C) Andrew Tridgell 1996
   5  * Copyright (C) Paul Mackerras 1996
   6  * Copyright (C) 2004, 2005, 2006 Wayne Davison
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
  21  */
  22
  23 #include "rsync.h"
  24
  25 int remote_protocol = 0;
  26
  27 extern int verbose;
  28 extern int am_server;
  29 extern int inplace;
  30 extern int fuzzy_basis;
  31 extern int read_batch;
  32 extern int checksum_seed;
  33 extern int basis_dir_cnt;
  34 extern int prune_empty_dirs;
  35 extern int protocol_version;
  36 extern char *dest_option;
  37
  38 void setup_protocol(int f_out,int f_in)
  39 {
  40         if (remote_protocol == 0) {
  41                 if (!read_batch)
  42                         write_int(f_out, protocol_version);
  43                 remote_protocol = read_int(f_in);
  44                 if (protocol_version > remote_protocol)
  45                         protocol_version = remote_protocol;
  46         }
  47         if (read_batch && remote_protocol > protocol_version) {
  48                 rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n",
  49                         remote_protocol, protocol_version);
  50                 exit_cleanup(RERR_PROTOCOL);
  51         }
  52
  53         if (verbose > 3) {
  54                 rprintf(FINFO, "(%s) Protocol versions: remote=%d, negotiated=%d\n",
  55                         am_server? "Server" : "Client", remote_protocol, protocol_version);
  56         }
  57         if (remote_protocol < MIN_PROTOCOL_VERSION
  58          || remote_protocol > MAX_PROTOCOL_VERSION) {
  59                 rprintf(FERROR,"protocol version mismatch -- is your shell clean?\n");
  60                 rprintf(FERROR,"(see the rsync man page for an explanation)\n");
  61                 exit_cleanup(RERR_PROTOCOL);
  62         }
  63         if (remote_protocol < OLD_PROTOCOL_VERSION) {
  64                 rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n",
  65                         am_server? "Client" : "Server");
  66         }
  67         if (protocol_version < MIN_PROTOCOL_VERSION) {
  68                 rprintf(FERROR, "--protocol must be at least %d on the %s.\n",
  69                         MIN_PROTOCOL_VERSION, am_server? "Server" : "Client");
  70                 exit_cleanup(RERR_PROTOCOL);
  71         }
  72         if (protocol_version > PROTOCOL_VERSION) {
  73                 rprintf(FERROR, "--protocol must be no more than %d on the %s.\n",
  74                         PROTOCOL_VERSION, am_server? "Server" : "Client");
  75                 exit_cleanup(RERR_PROTOCOL);
  76         }
  77
  78         if (protocol_version < 29) {
  79                 if (fuzzy_basis) {
  80                         rprintf(FERROR,
  81                             "--fuzzy requires protocol 29 or higher"
  82                             " (negotiated %d).\n",
  83                             protocol_version);
  84                         exit_cleanup(RERR_PROTOCOL);
  85                 }
  86
  87                 if (basis_dir_cnt && inplace) {
  88                         rprintf(FERROR,
  89                             "%s with --inplace requires protocol 29 or higher"
  90                             " (negotiated %d).\n",
  91                             dest_option, protocol_version);
  92                         exit_cleanup(RERR_PROTOCOL);
  93                 }
  94
  95                 if (basis_dir_cnt > 1) {
  96                         rprintf(FERROR,
  97                             "Using more than one %s option requires protocol"
  98                             " 29 or higher (negotiated %d).\n",
  99                             dest_option, protocol_version);
 100                         exit_cleanup(RERR_PROTOCOL);
 101                 }
 102
 103                 if (prune_empty_dirs) {
 104                         rprintf(FERROR,
 105                             "--prune-empty-dirs requires protocol 29 or higher"
 106                             " (negotiated %d).\n",
 107                             protocol_version);
 108                         exit_cleanup(RERR_PROTOCOL);
 109                 }
 110         }
 111
 112         if (am_server) {
 113                 if (!checksum_seed)
 114                         checksum_seed = time(NULL);
 115                 write_int(f_out, checksum_seed);
 116         } else {
 117                 checksum_seed = read_int(f_in);
 118         }
 119 }