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, 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 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 int inc_recurse = 0;
  28
  29 extern int verbose;
  30 extern int am_server;
  31 extern int am_sender;
  32 extern int inplace;
  33 extern int recurse;
  34 extern int fuzzy_basis;
  35 extern int read_batch;
  36 extern int max_delete;
  37 extern int delay_updates;
  38 extern int checksum_seed;
  39 extern int basis_dir_cnt;
  40 extern int prune_empty_dirs;
  41 extern int protocol_version;
  42 extern int preserve_uid;
  43 extern int preserve_gid;
  44 extern int preserve_hard_links;
  45 extern int need_messages_from_generator;
  46 extern int delete_mode, delete_before, delete_during, delete_after;
  47 extern char *dest_option;
  48
  49 void setup_protocol(int f_out,int f_in)
  50 {
  51         if (am_sender)
  52                 file_extra_cnt += PTR_EXTRA_LEN;
  53         else
  54                 file_extra_cnt++;
  55         if (preserve_uid)
  56                 preserve_uid = ++file_extra_cnt;
  57         if (preserve_gid)
  58                 preserve_gid = ++file_extra_cnt;
  59
  60         if (remote_protocol == 0) {
  61                 if (!read_batch)
  62                         write_int(f_out, protocol_version);
  63                 remote_protocol = read_int(f_in);
  64                 if (protocol_version > remote_protocol)
  65                         protocol_version = remote_protocol;
  66         }
  67         if (read_batch && remote_protocol > protocol_version) {
  68                 rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n",
  69                         remote_protocol, protocol_version);
  70                 exit_cleanup(RERR_PROTOCOL);
  71         }
  72
  73         if (verbose > 3) {
  74                 rprintf(FINFO, "(%s) Protocol versions: remote=%d, negotiated=%d\n",
  75                         am_server? "Server" : "Client", remote_protocol, protocol_version);
  76         }
  77         if (remote_protocol < MIN_PROTOCOL_VERSION
  78          || remote_protocol > MAX_PROTOCOL_VERSION) {
  79                 rprintf(FERROR,"protocol version mismatch -- is your shell clean?\n");
  80                 rprintf(FERROR,"(see the rsync man page for an explanation)\n");
  81                 exit_cleanup(RERR_PROTOCOL);
  82         }
  83         if (remote_protocol < OLD_PROTOCOL_VERSION) {
  84                 rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n",
  85                         am_server? "Client" : "Server");
  86         }
  87         if (protocol_version < MIN_PROTOCOL_VERSION) {
  88                 rprintf(FERROR, "--protocol must be at least %d on the %s.\n",
  89                         MIN_PROTOCOL_VERSION, am_server? "Server" : "Client");
  90                 exit_cleanup(RERR_PROTOCOL);
  91         }
  92         if (protocol_version > PROTOCOL_VERSION) {
  93                 rprintf(FERROR, "--protocol must be no more than %d on the %s.\n",
  94                         PROTOCOL_VERSION, am_server? "Server" : "Client");
  95                 exit_cleanup(RERR_PROTOCOL);
  96         }
  97
  98         if (protocol_version < 30) {
  99                 if (max_delete == 0 && am_sender) {
 100                         rprintf(FERROR,
 101                             "--max-delete=0 requires protocol 30 or higher"
 102                             " (negotiated %d).\n",
 103                             protocol_version);
 104                         exit_cleanup(RERR_PROTOCOL);
 105                 }
 106         }
 107
 108         if (delete_mode && !(delete_before+delete_during+delete_after)) {
 109                 if (protocol_version < 30)
 110                         delete_before = 1;
 111                 else
 112                         delete_during = 1;
 113         }
 114
 115         if (protocol_version < 29) {
 116                 if (fuzzy_basis) {
 117                         rprintf(FERROR,
 118                             "--fuzzy requires protocol 29 or higher"
 119                             " (negotiated %d).\n",
 120                             protocol_version);
 121                         exit_cleanup(RERR_PROTOCOL);
 122                 }
 123
 124                 if (basis_dir_cnt && inplace) {
 125                         rprintf(FERROR,
 126                             "%s with --inplace requires protocol 29 or higher"
 127                             " (negotiated %d).\n",
 128                             dest_option, protocol_version);
 129                         exit_cleanup(RERR_PROTOCOL);
 130                 }
 131
 132                 if (basis_dir_cnt > 1) {
 133                         rprintf(FERROR,
 134                             "Using more than one %s option requires protocol"
 135                             " 29 or higher (negotiated %d).\n",
 136                             dest_option, protocol_version);
 137                         exit_cleanup(RERR_PROTOCOL);
 138                 }
 139
 140                 if (prune_empty_dirs) {
 141                         rprintf(FERROR,
 142                             "--prune-empty-dirs requires protocol 29 or higher"
 143                             " (negotiated %d).\n",
 144                             protocol_version);
 145                         exit_cleanup(RERR_PROTOCOL);
 146                 }
 147         } else if (protocol_version >= 30) {
 148                 if (recurse && !preserve_hard_links && !delete_before
 149                  && !delete_after && !delay_updates && !prune_empty_dirs)
 150                         inc_recurse = 1;
 151                 need_messages_from_generator = 1;
 152         }
 153
 154         if (am_server) {
 155                 if (!checksum_seed)
 156                         checksum_seed = time(NULL);
 157                 write_int(f_out, checksum_seed);
 158         } else {
 159                 checksum_seed = read_int(f_in);
 160         }
 161 }