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 am_sender;
  30 extern int inplace;
  31 extern int fuzzy_basis;
  32 extern int read_batch;
  33 extern int max_delete;
  34 extern int checksum_seed;
  35 extern int basis_dir_cnt;
  36 extern int prune_empty_dirs;
  37 extern int protocol_version;
  38 extern char *dest_option;
  39
  40 void setup_protocol(int f_out,int f_in)
  41 {
  42         if (remote_protocol == 0) {
  43                 if (!read_batch)
  44                         write_int(f_out, protocol_version);
  45                 remote_protocol = read_int(f_in);
  46                 if (protocol_version > remote_protocol)
  47                         protocol_version = remote_protocol;
  48         }
  49         if (read_batch && remote_protocol > protocol_version) {
  50                 rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n",
  51                         remote_protocol, protocol_version);
  52                 exit_cleanup(RERR_PROTOCOL);
  53         }
  54
  55         if (verbose > 3) {
  56                 rprintf(FINFO, "(%s) Protocol versions: remote=%d, negotiated=%d\n",
  57                         am_server? "Server" : "Client", remote_protocol, protocol_version);
  58         }
  59         if (remote_protocol < MIN_PROTOCOL_VERSION
  60          || remote_protocol > MAX_PROTOCOL_VERSION) {
  61                 rprintf(FERROR,"protocol version mismatch -- is your shell clean?\n");
  62                 rprintf(FERROR,"(see the rsync man page for an explanation)\n");
  63                 exit_cleanup(RERR_PROTOCOL);
  64         }
  65         if (remote_protocol < OLD_PROTOCOL_VERSION) {
  66                 rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n",
  67                         am_server? "Client" : "Server");
  68         }
  69         if (protocol_version < MIN_PROTOCOL_VERSION) {
  70                 rprintf(FERROR, "--protocol must be at least %d on the %s.\n",
  71                         MIN_PROTOCOL_VERSION, am_server? "Server" : "Client");
  72                 exit_cleanup(RERR_PROTOCOL);
  73         }
  74         if (protocol_version > PROTOCOL_VERSION) {
  75                 rprintf(FERROR, "--protocol must be no more than %d on the %s.\n",
  76                         PROTOCOL_VERSION, am_server? "Server" : "Client");
  77                 exit_cleanup(RERR_PROTOCOL);
  78         }
  79
  80         if (protocol_version < 30) {
  81                 if (max_delete == 0 && am_sender) {
  82                         rprintf(FERROR,
  83                             "--max-delete=0 requires protocol 30 or higher"
  84                             " (negotiated %d).\n",
  85                             protocol_version);
  86                         exit_cleanup(RERR_PROTOCOL);
  87                 }
  88         }
  89
  90         if (protocol_version < 29) {
  91                 if (fuzzy_basis) {
  92                         rprintf(FERROR,
  93                             "--fuzzy requires protocol 29 or higher"
  94                             " (negotiated %d).\n",
  95                             protocol_version);
  96                         exit_cleanup(RERR_PROTOCOL);
  97                 }
  98
  99                 if (basis_dir_cnt && inplace) {
 100                         rprintf(FERROR,
 101                             "%s with --inplace requires protocol 29 or higher"
 102                             " (negotiated %d).\n",
 103                             dest_option, protocol_version);
 104                         exit_cleanup(RERR_PROTOCOL);
 105                 }
 106
 107                 if (basis_dir_cnt > 1) {
 108                         rprintf(FERROR,
 109                             "Using more than one %s option requires protocol"
 110                             " 29 or higher (negotiated %d).\n",
 111                             dest_option, protocol_version);
 112                         exit_cleanup(RERR_PROTOCOL);
 113                 }
 114
 115                 if (prune_empty_dirs) {
 116                         rprintf(FERROR,
 117                             "--prune-empty-dirs requires protocol 29 or higher"
 118                             " (negotiated %d).\n",
 119                             protocol_version);
 120                         exit_cleanup(RERR_PROTOCOL);
 121                 }
 122         }
 123
 124         if (am_server) {
 125                 if (!checksum_seed)
 126                         checksum_seed = time(NULL);
 127                 write_int(f_out, checksum_seed);
 128         } else {
 129                 checksum_seed = read_int(f_in);
 130         }
 131 }