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