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 local_server;
  32 extern int inplace;
  33 extern int recurse;
  34 extern int allow_inc_recurse;
  35 extern int fuzzy_basis;
  36 extern int read_batch;
  37 extern int max_delete;
  38 extern int delay_updates;
  39 extern int checksum_seed;
  40 extern int basis_dir_cnt;
  41 extern int prune_empty_dirs;
  42 extern int protocol_version;
  43 extern int preserve_uid;
  44 extern int preserve_gid;
  45 extern int preserve_acls;
  46 extern int preserve_xattrs;
  47 extern int preserve_hard_links;
  48 extern int need_messages_from_generator;
  49 extern int delete_mode, delete_before, delete_during, delete_after;
  50 extern int delete_excluded;
  51 extern int make_backups;
  52 extern char *shell_cmd; /* contains VER.SUB string if client is a pre-release */
  53 extern char *backup_dir, *backup_suffix;
  54 extern char *partial_dir;
  55 extern char *dest_option;
  56 extern struct filter_list_struct filter_list;
  57
  58 /* The server makes sure that if either side only supports a pre-release
  59  * version of a protocol, that both sides must speak a compatible version
  60  * of that protocol for it to be advertised as available. */
  61 static void check_sub_protocol(void)
  62 {
  63         char *dot;
  64         int their_protocol, their_sub;
  65         int our_sub = protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION;
  66
  67         if (!shell_cmd || !(dot = strchr(shell_cmd, '.'))
  68          || !(their_protocol = atoi(shell_cmd))
  69          || !(their_sub = atoi(dot+1))) {
  70                 if (our_sub)
  71                         protocol_version--;
  72                 return;
  73         }
  74
  75         if (their_protocol < protocol_version) {
  76                 if (their_sub)
  77                         protocol_version = their_protocol - 1;
  78                 return;
  79         }
  80
  81         if (their_protocol > protocol_version)
  82                 their_sub = 0; /* 0 == final version */
  83         if (their_sub != our_sub)
  84                 protocol_version--;
  85 }
  86
  87 void setup_protocol(int f_out,int f_in)
  88 {
  89         if (am_sender)
  90                 file_extra_cnt += PTR_EXTRA_LEN;
  91         else
  92                 file_extra_cnt++;
  93         if (preserve_uid)
  94                 preserve_uid = ++file_extra_cnt;
  95         if (preserve_gid)
  96                 preserve_gid = ++file_extra_cnt;
  97         if (preserve_acls && !am_sender)
  98                 preserve_acls = ++file_extra_cnt;
  99         if (preserve_xattrs)
 100                 preserve_xattrs = ++file_extra_cnt;
 101
 102         if (remote_protocol == 0) {
 103                 if (am_server && !local_server)
 104                         check_sub_protocol();
 105                 if (!read_batch)
 106                         write_int(f_out, protocol_version);
 107                 remote_protocol = read_int(f_in);
 108                 if (protocol_version > remote_protocol)
 109                         protocol_version = remote_protocol;
 110         }
 111         if (read_batch && remote_protocol > protocol_version) {
 112                 rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n",
 113                         remote_protocol, protocol_version);
 114                 exit_cleanup(RERR_PROTOCOL);
 115         }
 116
 117         if (verbose > 3) {
 118                 rprintf(FINFO, "(%s) Protocol versions: remote=%d, negotiated=%d\n",
 119                         am_server? "Server" : "Client", remote_protocol, protocol_version);
 120         }
 121         if (remote_protocol < MIN_PROTOCOL_VERSION
 122          || remote_protocol > MAX_PROTOCOL_VERSION) {
 123                 rprintf(FERROR,"protocol version mismatch -- is your shell clean?\n");
 124                 rprintf(FERROR,"(see the rsync man page for an explanation)\n");
 125                 exit_cleanup(RERR_PROTOCOL);
 126         }
 127         if (remote_protocol < OLD_PROTOCOL_VERSION) {
 128                 rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n",
 129                         am_server? "Client" : "Server");
 130         }
 131         if (protocol_version < MIN_PROTOCOL_VERSION) {
 132                 rprintf(FERROR, "--protocol must be at least %d on the %s.\n",
 133                         MIN_PROTOCOL_VERSION, am_server? "Server" : "Client");
 134                 exit_cleanup(RERR_PROTOCOL);
 135         }
 136         if (protocol_version > PROTOCOL_VERSION) {
 137                 rprintf(FERROR, "--protocol must be no more than %d on the %s.\n",
 138                         PROTOCOL_VERSION, am_server? "Server" : "Client");
 139                 exit_cleanup(RERR_PROTOCOL);
 140         }
 141
 142         if (protocol_version < 30) {
 143                 if (max_delete == 0 && am_sender) {
 144                         rprintf(FERROR,
 145                             "--max-delete=0 requires protocol 30 or higher"
 146                             " (negotiated %d).\n",
 147                             protocol_version);
 148                         exit_cleanup(RERR_PROTOCOL);
 149                 }
 150                 if (preserve_acls && !local_server) {
 151                         rprintf(FERROR,
 152                             "--acls requires protocol 30 or higher"
 153                             " (negotiated %d).\n",
 154                             protocol_version);
 155                         exit_cleanup(RERR_PROTOCOL);
 156                 }
 157                 if (preserve_xattrs && !local_server) {
 158                         rprintf(FERROR,
 159                             "--xattrs requires protocol 30 or higher"
 160                             " (negotiated %d).\n",
 161                             protocol_version);
 162                         exit_cleanup(RERR_PROTOCOL);
 163                 }
 164         }
 165
 166         if (delete_mode && !(delete_before+delete_during+delete_after)) {
 167                 if (protocol_version < 30)
 168                         delete_before = 1;
 169                 else
 170                         delete_during = 1;
 171         }
 172
 173         if (protocol_version < 29) {
 174                 if (fuzzy_basis) {
 175                         rprintf(FERROR,
 176                             "--fuzzy requires protocol 29 or higher"
 177                             " (negotiated %d).\n",
 178                             protocol_version);
 179                         exit_cleanup(RERR_PROTOCOL);
 180                 }
 181
 182                 if (basis_dir_cnt && inplace) {
 183                         rprintf(FERROR,
 184                             "%s with --inplace requires protocol 29 or higher"
 185                             " (negotiated %d).\n",
 186                             dest_option, protocol_version);
 187                         exit_cleanup(RERR_PROTOCOL);
 188                 }
 189
 190                 if (basis_dir_cnt > 1) {
 191                         rprintf(FERROR,
 192                             "Using more than one %s option requires protocol"
 193                             " 29 or higher (negotiated %d).\n",
 194                             dest_option, protocol_version);
 195                         exit_cleanup(RERR_PROTOCOL);
 196                 }
 197
 198                 if (prune_empty_dirs) {
 199                         rprintf(FERROR,
 200                             "--prune-empty-dirs requires protocol 29 or higher"
 201                             " (negotiated %d).\n",
 202                             protocol_version);
 203                         exit_cleanup(RERR_PROTOCOL);
 204                 }
 205         } else if (protocol_version >= 30) {
 206                 if (recurse && allow_inc_recurse && !preserve_hard_links
 207                  && !delete_before && !delete_after && !delay_updates
 208                  && !prune_empty_dirs)
 209                         inc_recurse = 1;
 210                 need_messages_from_generator = 1;
 211         }
 212
 213         if (partial_dir && *partial_dir != '/' && (!am_server || local_server)) {
 214                 int flags = MATCHFLG_NO_PREFIXES | MATCHFLG_DIRECTORY;
 215                 if (!am_sender || protocol_version >= 30)
 216                         flags |= MATCHFLG_PERISHABLE;
 217                 parse_rule(&filter_list, partial_dir, flags, 0);
 218         }
 219
 220         if (am_server) {
 221                 if (!checksum_seed)
 222                         checksum_seed = time(NULL);
 223                 write_int(f_out, checksum_seed);
 224         } else {
 225                 checksum_seed = read_int(f_in);
 226         }
 227 }