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 use_qsort;
  35 extern int allow_inc_recurse;
  36 extern int fuzzy_basis;
  37 extern int read_batch;
  38 extern int max_delete;
  39 extern int delay_updates;
  40 extern int checksum_seed;
  41 extern int basis_dir_cnt;
  42 extern int prune_empty_dirs;
  43 extern int protocol_version;
  44 extern int preserve_uid;
  45 extern int preserve_gid;
  46 extern int preserve_acls;
  47 extern int preserve_xattrs;
  48 extern int preserve_hard_links;
  49 extern int need_messages_from_generator;
  50 extern int delete_mode, delete_before, delete_during, delete_after;
  51 extern int delete_excluded;
  52 extern int make_backups;
  53 extern char *shell_cmd; /* contains VER.SUB string if client is a pre-release */
  54 extern char *backup_dir, *backup_suffix;
  55 extern char *partial_dir;
  56 extern char *dest_option;
  57 extern struct filter_list_struct filter_list;
  58
  59 /* The server makes sure that if either side only supports a pre-release
  60  * version of a protocol, that both sides must speak a compatible version
  61  * of that protocol for it to be advertised as available. */
  62 static void check_sub_protocol(void)
  63 {
  64         char *dot;
  65         int their_protocol, their_sub;
  66         int our_sub = protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION;
  67
  68         if (!shell_cmd || !(dot = strchr(shell_cmd, '.'))
  69          || !(their_protocol = atoi(shell_cmd))
  70          || !(their_sub = atoi(dot+1))) {
  71                 if (our_sub)
  72                         protocol_version--;
  73                 return;
  74         }
  75
  76         if (their_protocol < protocol_version) {
  77                 if (their_sub)
  78                         protocol_version = their_protocol - 1;
  79                 return;
  80         }
  81
  82         if (their_protocol > protocol_version)
  83                 their_sub = 0; /* 0 == final version */
  84         if (their_sub != our_sub)
  85                 protocol_version--;
  86 }
  87
  88 void setup_protocol(int f_out,int f_in)
  89 {
  90         if (am_sender)
  91                 file_extra_cnt += PTR_EXTRA_LEN;
  92         else
  93                 file_extra_cnt++;
  94         if (preserve_uid)
  95                 preserve_uid = ++file_extra_cnt;
  96         if (preserve_gid)
  97                 preserve_gid = ++file_extra_cnt;
  98         if (preserve_acls && !am_sender)
  99                 preserve_acls = ++file_extra_cnt;
 100         if (preserve_xattrs)
 101                 preserve_xattrs = ++file_extra_cnt;
 102
 103         if (remote_protocol == 0) {
 104                 if (am_server && !local_server)
 105                         check_sub_protocol();
 106                 if (!read_batch)
 107                         write_int(f_out, protocol_version);
 108                 remote_protocol = read_int(f_in);
 109                 if (protocol_version > remote_protocol)
 110                         protocol_version = remote_protocol;
 111         }
 112         if (read_batch && remote_protocol > protocol_version) {
 113                 rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n",
 114                         remote_protocol, protocol_version);
 115                 exit_cleanup(RERR_PROTOCOL);
 116         }
 117
 118         if (verbose > 3) {
 119                 rprintf(FINFO, "(%s) Protocol versions: remote=%d, negotiated=%d\n",
 120                         am_server? "Server" : "Client", remote_protocol, protocol_version);
 121         }
 122         if (remote_protocol < MIN_PROTOCOL_VERSION
 123          || remote_protocol > MAX_PROTOCOL_VERSION) {
 124                 rprintf(FERROR,"protocol version mismatch -- is your shell clean?\n");
 125                 rprintf(FERROR,"(see the rsync man page for an explanation)\n");
 126                 exit_cleanup(RERR_PROTOCOL);
 127         }
 128         if (remote_protocol < OLD_PROTOCOL_VERSION) {
 129                 rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n",
 130                         am_server? "Client" : "Server");
 131         }
 132         if (protocol_version < MIN_PROTOCOL_VERSION) {
 133                 rprintf(FERROR, "--protocol must be at least %d on the %s.\n",
 134                         MIN_PROTOCOL_VERSION, am_server? "Server" : "Client");
 135                 exit_cleanup(RERR_PROTOCOL);
 136         }
 137         if (protocol_version > PROTOCOL_VERSION) {
 138                 rprintf(FERROR, "--protocol must be no more than %d on the %s.\n",
 139                         PROTOCOL_VERSION, am_server? "Server" : "Client");
 140                 exit_cleanup(RERR_PROTOCOL);
 141         }
 142
 143         if (protocol_version < 30) {
 144                 if (max_delete == 0 && am_sender) {
 145                         rprintf(FERROR,
 146                             "--max-delete=0 requires protocol 30 or higher"
 147                             " (negotiated %d).\n",
 148                             protocol_version);
 149                         exit_cleanup(RERR_PROTOCOL);
 150                 }
 151                 if (preserve_acls && !local_server) {
 152                         rprintf(FERROR,
 153                             "--acls requires protocol 30 or higher"
 154                             " (negotiated %d).\n",
 155                             protocol_version);
 156                         exit_cleanup(RERR_PROTOCOL);
 157                 }
 158                 if (preserve_xattrs && !local_server) {
 159                         rprintf(FERROR,
 160                             "--xattrs requires protocol 30 or higher"
 161                             " (negotiated %d).\n",
 162                             protocol_version);
 163                         exit_cleanup(RERR_PROTOCOL);
 164                 }
 165         }
 166
 167         if (delete_mode && !(delete_before+delete_during+delete_after)) {
 168                 if (protocol_version < 30)
 169                         delete_before = 1;
 170                 else
 171                         delete_during = 1;
 172         }
 173
 174         if (protocol_version < 29) {
 175                 if (fuzzy_basis) {
 176                         rprintf(FERROR,
 177                             "--fuzzy requires protocol 29 or higher"
 178                             " (negotiated %d).\n",
 179                             protocol_version);
 180                         exit_cleanup(RERR_PROTOCOL);
 181                 }
 182
 183                 if (basis_dir_cnt && inplace) {
 184                         rprintf(FERROR,
 185                             "%s with --inplace requires protocol 29 or higher"
 186                             " (negotiated %d).\n",
 187                             dest_option, protocol_version);
 188                         exit_cleanup(RERR_PROTOCOL);
 189                 }
 190
 191                 if (basis_dir_cnt > 1) {
 192                         rprintf(FERROR,
 193                             "Using more than one %s option requires protocol"
 194                             " 29 or higher (negotiated %d).\n",
 195                             dest_option, protocol_version);
 196                         exit_cleanup(RERR_PROTOCOL);
 197                 }
 198
 199                 if (prune_empty_dirs) {
 200                         rprintf(FERROR,
 201                             "--prune-empty-dirs requires protocol 29 or higher"
 202                             " (negotiated %d).\n",
 203                             protocol_version);
 204                         exit_cleanup(RERR_PROTOCOL);
 205                 }
 206         } else if (protocol_version >= 30) {
 207                 if (recurse && allow_inc_recurse && !preserve_hard_links
 208                  && !delete_before && !delete_after && !delay_updates
 209                  && !prune_empty_dirs && !use_qsort)
 210                         inc_recurse = 1;
 211                 need_messages_from_generator = 1;
 212         }
 213
 214         if (partial_dir && *partial_dir != '/' && (!am_server || local_server)) {
 215                 int flags = MATCHFLG_NO_PREFIXES | MATCHFLG_DIRECTORY;
 216                 if (!am_sender || protocol_version >= 30)
 217                         flags |= MATCHFLG_PERISHABLE;
 218                 parse_rule(&filter_list, partial_dir, flags, 0);
 219         }
 220
 221         if (am_server) {
 222                 if (!checksum_seed)
 223                         checksum_seed = time(NULL);
 224                 write_int(f_out, checksum_seed);
 225         } else {
 226                 checksum_seed = read_int(f_in);
 227         }
 228 }