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 file_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 int preserve_uid;
  40 extern int preserve_gid;
  41 extern char *dest_option;
  42
  43 void setup_protocol(int f_out,int f_in)
  44 {
  45         if (am_sender)
  46                 file_extra_cnt += PTR_EXTRA_LEN;
  47         else
  48                 file_extra_cnt++;
  49         if (preserve_uid)
  50                 preserve_uid = ++file_extra_cnt;
  51         if (preserve_gid)
  52                 preserve_gid = ++file_extra_cnt;
  53
  54         if (remote_protocol == 0) {
  55                 if (!read_batch)
  56                         write_int(f_out, protocol_version);
  57                 remote_protocol = read_int(f_in);
  58                 if (protocol_version > remote_protocol)
  59                         protocol_version = remote_protocol;
  60         }
  61         if (read_batch && remote_protocol > protocol_version) {
  62                 rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n",
  63                         remote_protocol, protocol_version);
  64                 exit_cleanup(RERR_PROTOCOL);
  65         }
  66
  67         if (verbose > 3) {
  68                 rprintf(FINFO, "(%s) Protocol versions: remote=%d, negotiated=%d\n",
  69                         am_server? "Server" : "Client", remote_protocol, protocol_version);
  70         }
  71         if (remote_protocol < MIN_PROTOCOL_VERSION
  72          || remote_protocol > MAX_PROTOCOL_VERSION) {
  73                 rprintf(FERROR,"protocol version mismatch -- is your shell clean?\n");
  74                 rprintf(FERROR,"(see the rsync man page for an explanation)\n");
  75                 exit_cleanup(RERR_PROTOCOL);
  76         }
  77         if (remote_protocol < OLD_PROTOCOL_VERSION) {
  78                 rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n",
  79                         am_server? "Client" : "Server");
  80         }
  81         if (protocol_version < MIN_PROTOCOL_VERSION) {
  82                 rprintf(FERROR, "--protocol must be at least %d on the %s.\n",
  83                         MIN_PROTOCOL_VERSION, am_server? "Server" : "Client");
  84                 exit_cleanup(RERR_PROTOCOL);
  85         }
  86         if (protocol_version > PROTOCOL_VERSION) {
  87                 rprintf(FERROR, "--protocol must be no more than %d on the %s.\n",
  88                         PROTOCOL_VERSION, am_server? "Server" : "Client");
  89                 exit_cleanup(RERR_PROTOCOL);
  90         }
  91
  92         if (protocol_version < 30) {
  93                 if (max_delete == 0 && am_sender) {
  94                         rprintf(FERROR,
  95                             "--max-delete=0 requires protocol 30 or higher"
  96                             " (negotiated %d).\n",
  97                             protocol_version);
  98                         exit_cleanup(RERR_PROTOCOL);
  99                 }
 100         }
 101
 102         if (protocol_version < 29) {
 103                 if (fuzzy_basis) {
 104                         rprintf(FERROR,
 105                             "--fuzzy requires protocol 29 or higher"
 106                             " (negotiated %d).\n",
 107                             protocol_version);
 108                         exit_cleanup(RERR_PROTOCOL);
 109                 }
 110
 111                 if (basis_dir_cnt && inplace) {
 112                         rprintf(FERROR,
 113                             "%s with --inplace requires protocol 29 or higher"
 114                             " (negotiated %d).\n",
 115                             dest_option, protocol_version);
 116                         exit_cleanup(RERR_PROTOCOL);
 117                 }
 118
 119                 if (basis_dir_cnt > 1) {
 120                         rprintf(FERROR,
 121                             "Using more than one %s option requires protocol"
 122                             " 29 or higher (negotiated %d).\n",
 123                             dest_option, protocol_version);
 124                         exit_cleanup(RERR_PROTOCOL);
 125                 }
 126
 127                 if (prune_empty_dirs) {
 128                         rprintf(FERROR,
 129                             "--prune-empty-dirs requires protocol 29 or higher"
 130                             " (negotiated %d).\n",
 131                             protocol_version);
 132                         exit_cleanup(RERR_PROTOCOL);
 133                 }
 134         }
 135
 136         if (am_server) {
 137                 if (!checksum_seed)
 138                         checksum_seed = time(NULL);
 139                 write_int(f_out, checksum_seed);
 140         } else {
 141                 checksum_seed = read_int(f_in);
 142         }
 143 }