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) 2004-2007 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 version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
  20  */
  21
  22 #include "rsync.h"
  23
  24 int remote_protocol = 0;
  25 int file_extra_cnt = 0; /* count of file-list extras that everyone gets */
  26 int inc_recurse = 0;
  27
  28 extern int verbose;
  29 extern int am_server;
  30 extern int am_sender;
  31 extern int inplace;
  32 extern int recurse;
  33 extern int fuzzy_basis;
  34 extern int read_batch;
  35 extern int max_delete;
  36 extern int delay_updates;
  37 extern int checksum_seed;
  38 extern int basis_dir_cnt;
  39 extern int prune_empty_dirs;
  40 extern int protocol_version;
  41 extern int preserve_uid;
  42 extern int preserve_gid;
  43 extern int preserve_hard_links;
  44 extern int need_messages_from_generator;
  45 extern int delete_mode, delete_before, delete_during, delete_after;
  46 extern char *dest_option;
  47
  48 void setup_protocol(int f_out,int f_in)
  49 {
  50         if (am_sender)
  51                 file_extra_cnt += PTR_EXTRA_LEN;
  52         else
  53                 file_extra_cnt++;
  54         if (preserve_uid)
  55                 preserve_uid = ++file_extra_cnt;
  56         if (preserve_gid)
  57                 preserve_gid = ++file_extra_cnt;
  58
  59         if (remote_protocol == 0) {
  60                 if (!read_batch)
  61                         write_int(f_out, protocol_version);
  62                 remote_protocol = read_int(f_in);
  63                 if (protocol_version > remote_protocol)
  64                         protocol_version = remote_protocol;
  65         }
  66         if (read_batch && remote_protocol > protocol_version) {
  67                 rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n",
  68                         remote_protocol, protocol_version);
  69                 exit_cleanup(RERR_PROTOCOL);
  70         }
  71
  72         if (verbose > 3) {
  73                 rprintf(FINFO, "(%s) Protocol versions: remote=%d, negotiated=%d\n",
  74                         am_server? "Server" : "Client", remote_protocol, protocol_version);
  75         }
  76         if (remote_protocol < MIN_PROTOCOL_VERSION
  77          || remote_protocol > MAX_PROTOCOL_VERSION) {
  78                 rprintf(FERROR,"protocol version mismatch -- is your shell clean?\n");
  79                 rprintf(FERROR,"(see the rsync man page for an explanation)\n");
  80                 exit_cleanup(RERR_PROTOCOL);
  81         }
  82         if (remote_protocol < OLD_PROTOCOL_VERSION) {
  83                 rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n",
  84                         am_server? "Client" : "Server");
  85         }
  86         if (protocol_version < MIN_PROTOCOL_VERSION) {
  87                 rprintf(FERROR, "--protocol must be at least %d on the %s.\n",
  88                         MIN_PROTOCOL_VERSION, am_server? "Server" : "Client");
  89                 exit_cleanup(RERR_PROTOCOL);
  90         }
  91         if (protocol_version > PROTOCOL_VERSION) {
  92                 rprintf(FERROR, "--protocol must be no more than %d on the %s.\n",
  93                         PROTOCOL_VERSION, am_server? "Server" : "Client");
  94                 exit_cleanup(RERR_PROTOCOL);
  95         }
  96
  97         if (protocol_version < 30) {
  98                 if (max_delete == 0 && am_sender) {
  99                         rprintf(FERROR,
 100                             "--max-delete=0 requires protocol 30 or higher"
 101                             " (negotiated %d).\n",
 102                             protocol_version);
 103                         exit_cleanup(RERR_PROTOCOL);
 104                 }
 105         }
 106
 107         if (delete_mode && !(delete_before+delete_during+delete_after)) {
 108                 if (protocol_version < 30)
 109                         delete_before = 1;
 110                 else
 111                         delete_during = 1;
 112         }
 113
 114         if (protocol_version < 29) {
 115                 if (fuzzy_basis) {
 116                         rprintf(FERROR,
 117                             "--fuzzy requires protocol 29 or higher"
 118                             " (negotiated %d).\n",
 119                             protocol_version);
 120                         exit_cleanup(RERR_PROTOCOL);
 121                 }
 122
 123                 if (basis_dir_cnt && inplace) {
 124                         rprintf(FERROR,
 125                             "%s with --inplace requires protocol 29 or higher"
 126                             " (negotiated %d).\n",
 127                             dest_option, protocol_version);
 128                         exit_cleanup(RERR_PROTOCOL);
 129                 }
 130
 131                 if (basis_dir_cnt > 1) {
 132                         rprintf(FERROR,
 133                             "Using more than one %s option requires protocol"
 134                             " 29 or higher (negotiated %d).\n",
 135                             dest_option, protocol_version);
 136                         exit_cleanup(RERR_PROTOCOL);
 137                 }
 138
 139                 if (prune_empty_dirs) {
 140                         rprintf(FERROR,
 141                             "--prune-empty-dirs requires protocol 29 or higher"
 142                             " (negotiated %d).\n",
 143                             protocol_version);
 144                         exit_cleanup(RERR_PROTOCOL);
 145                 }
 146         } else if (protocol_version >= 30) {
 147                 if (recurse && !preserve_hard_links && !delete_before
 148                  && !delete_after && !delay_updates && !prune_empty_dirs)
 149                         inc_recurse = 1;
 150                 need_messages_from_generator = 1;
 151         }
 152
 153         if (am_server) {
 154                 if (!checksum_seed)
 155                         checksum_seed = time(NULL);
 156                 write_int(f_out, checksum_seed);
 157         } else {
 158                 checksum_seed = read_int(f_in);
 159         }
 160 }