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 int flist_extra_cnt = 0; /* count of file-list extras that everyone gets */
  27
  28 extern int verbose;
  29 extern int am_server;
  30 extern int am_sender;
  31 extern int inplace;
  32 extern int fuzzy_basis;
  33 extern int read_batch;
  34 extern int max_delete;
  35 extern int checksum_seed;
  36 extern int basis_dir_cnt;
  37 extern int prune_empty_dirs;
  38 extern int protocol_version;
  39 extern char *dest_option;
  40
  41 void setup_protocol(int f_out,int f_in)
  42 {
  43         if (am_sender)
  44                 flist_extra_cnt += PTR_EXTRA_LEN;
  45         else
  46                 flist_extra_cnt++;
  47         if (preserve_uid)
  48                 preserve_uid = ++flist_extra_cnt;
  49         if (preserve_gid)
  50                 preserve_gid = ++flist_extra_cnt;
  51
  52         if (remote_protocol == 0) {
  53                 if (!read_batch)
  54                         write_int(f_out, protocol_version);
  55                 remote_protocol = read_int(f_in);
  56                 if (protocol_version > remote_protocol)
  57                         protocol_version = remote_protocol;
  58         }
  59         if (read_batch && remote_protocol > protocol_version) {
  60                 rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n",
  61                         remote_protocol, protocol_version);
  62                 exit_cleanup(RERR_PROTOCOL);
  63         }
  64
  65         if (verbose > 3) {
  66                 rprintf(FINFO, "(%s) Protocol versions: remote=%d, negotiated=%d\n",
  67                         am_server? "Server" : "Client", remote_protocol, protocol_version);
  68         }
  69         if (remote_protocol < MIN_PROTOCOL_VERSION
  70          || remote_protocol > MAX_PROTOCOL_VERSION) {
  71                 rprintf(FERROR,"protocol version mismatch -- is your shell clean?\n");
  72                 rprintf(FERROR,"(see the rsync man page for an explanation)\n");
  73                 exit_cleanup(RERR_PROTOCOL);
  74         }
  75         if (remote_protocol < OLD_PROTOCOL_VERSION) {
  76                 rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n",
  77                         am_server? "Client" : "Server");
  78         }
  79         if (protocol_version < MIN_PROTOCOL_VERSION) {
  80                 rprintf(FERROR, "--protocol must be at least %d on the %s.\n",
  81                         MIN_PROTOCOL_VERSION, am_server? "Server" : "Client");
  82                 exit_cleanup(RERR_PROTOCOL);
  83         }
  84         if (protocol_version > PROTOCOL_VERSION) {
  85                 rprintf(FERROR, "--protocol must be no more than %d on the %s.\n",
  86                         PROTOCOL_VERSION, am_server? "Server" : "Client");
  87                 exit_cleanup(RERR_PROTOCOL);
  88         }
  89
  90         if (protocol_version < 30) {
  91                 if (max_delete == 0 && am_sender) {
  92                         rprintf(FERROR,
  93                             "--max-delete=0 requires protocol 30 or higher"
  94                             " (negotiated %d).\n",
  95                             protocol_version);
  96                         exit_cleanup(RERR_PROTOCOL);
  97                 }
  98         }
  99
 100         if (protocol_version < 29) {
 101                 if (fuzzy_basis) {
 102                         rprintf(FERROR,
 103                             "--fuzzy requires protocol 29 or higher"
 104                             " (negotiated %d).\n",
 105                             protocol_version);
 106                         exit_cleanup(RERR_PROTOCOL);
 107                 }
 108
 109                 if (basis_dir_cnt && inplace) {
 110                         rprintf(FERROR,
 111                             "%s with --inplace requires protocol 29 or higher"
 112                             " (negotiated %d).\n",
 113                             dest_option, protocol_version);
 114                         exit_cleanup(RERR_PROTOCOL);
 115                 }
 116
 117                 if (basis_dir_cnt > 1) {
 118                         rprintf(FERROR,
 119                             "Using more than one %s option requires protocol"
 120                             " 29 or higher (negotiated %d).\n",
 121                             dest_option, protocol_version);
 122                         exit_cleanup(RERR_PROTOCOL);
 123                 }
 124
 125                 if (prune_empty_dirs) {
 126                         rprintf(FERROR,
 127                             "--prune-empty-dirs requires protocol 29 or higher"
 128                             " (negotiated %d).\n",
 129                             protocol_version);
 130                         exit_cleanup(RERR_PROTOCOL);
 131                 }
 132         }
 133
 134         if (am_server) {
 135                 if (!checksum_seed)
 136                         checksum_seed = time(NULL);
 137                 write_int(f_out, checksum_seed);
 138         } else {
 139                 checksum_seed = read_int(f_in);
 140         }
 141 }