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 append_mode;
  37 extern int fuzzy_basis;
  38 extern int read_batch;
  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 protect_args;
  45 extern int preserve_uid;
  46 extern int preserve_gid;
  47 extern int preserve_acls;
  48 extern int preserve_xattrs;
  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 char *files_from;
  58 extern char *filesfrom_host;
  59 extern struct filter_list_struct filter_list;
  60 #ifdef ICONV_OPTION
  61 extern char *iconv_opt;
  62 extern iconv_t ic_send, ic_recv;
  63 #endif
  64
  65 /* These index values are for the file-list's extra-attribute array. */
  66 int uid_ndx, gid_ndx, acls_ndx, xattrs_ndx;
  67 #ifdef ICONV_OPTION
  68 int ic_ndx;
  69
  70 int filesfrom_convert = 0;
  71 #endif
  72
  73 /* The server makes sure that if either side only supports a pre-release
  74  * version of a protocol, that both sides must speak a compatible version
  75  * of that protocol for it to be advertised as available. */
  76 static void check_sub_protocol(void)
  77 {
  78         char *dot;
  79         int their_protocol, their_sub;
  80 #if SUBPROTOCOL_VERSION != 0
  81         int our_sub = protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION;
  82 #else
  83         int our_sub = 0;
  84 #endif
  85
  86         if (!shell_cmd || !(dot = strchr(shell_cmd, '.'))
  87          || !(their_protocol = atoi(shell_cmd))
  88          || !(their_sub = atoi(dot+1))) {
  89 #if SUBPROTOCOL_VERSION != 0
  90                 if (our_sub)
  91                         protocol_version--;
  92 #endif
  93                 return;
  94         }
  95
  96         if (their_protocol < protocol_version) {
  97                 if (their_sub)
  98                         protocol_version = their_protocol - 1;
  99                 return;
 100         }
 101
 102         if (their_protocol > protocol_version)
 103                 their_sub = 0; /* 0 == final version of older protocol */
 104         if (their_sub != our_sub)
 105                 protocol_version--;
 106 }
 107
 108 void setup_protocol(int f_out,int f_in)
 109 {
 110         if (am_sender)
 111                 file_extra_cnt += PTR_EXTRA_LEN;
 112         else
 113                 file_extra_cnt++;
 114         if (preserve_uid)
 115                 uid_ndx = ++file_extra_cnt;
 116         if (preserve_gid)
 117                 gid_ndx = ++file_extra_cnt;
 118         if (preserve_acls && !am_sender)
 119                 acls_ndx = ++file_extra_cnt;
 120         if (preserve_xattrs)
 121                 xattrs_ndx = ++file_extra_cnt;
 122
 123         if (remote_protocol == 0) {
 124                 if (am_server && !local_server)
 125                         check_sub_protocol();
 126                 if (!read_batch)
 127                         write_int(f_out, protocol_version);
 128                 remote_protocol = read_int(f_in);
 129                 if (protocol_version > remote_protocol)
 130                         protocol_version = remote_protocol;
 131         }
 132         if (read_batch && remote_protocol > protocol_version) {
 133                 rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n",
 134                         remote_protocol, protocol_version);
 135                 exit_cleanup(RERR_PROTOCOL);
 136         }
 137
 138         if (verbose > 3) {
 139                 rprintf(FINFO, "(%s) Protocol versions: remote=%d, negotiated=%d\n",
 140                         am_server? "Server" : "Client", remote_protocol, protocol_version);
 141         }
 142         if (remote_protocol < MIN_PROTOCOL_VERSION
 143          || remote_protocol > MAX_PROTOCOL_VERSION) {
 144                 rprintf(FERROR,"protocol version mismatch -- is your shell clean?\n");
 145                 rprintf(FERROR,"(see the rsync man page for an explanation)\n");
 146                 exit_cleanup(RERR_PROTOCOL);
 147         }
 148         if (remote_protocol < OLD_PROTOCOL_VERSION) {
 149                 rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n",
 150                         am_server? "Client" : "Server");
 151         }
 152         if (protocol_version < MIN_PROTOCOL_VERSION) {
 153                 rprintf(FERROR, "--protocol must be at least %d on the %s.\n",
 154                         MIN_PROTOCOL_VERSION, am_server? "Server" : "Client");
 155                 exit_cleanup(RERR_PROTOCOL);
 156         }
 157         if (protocol_version > PROTOCOL_VERSION) {
 158                 rprintf(FERROR, "--protocol must be no more than %d on the %s.\n",
 159                         PROTOCOL_VERSION, am_server? "Server" : "Client");
 160                 exit_cleanup(RERR_PROTOCOL);
 161         }
 162
 163         if (protocol_version < 30) {
 164                 if (append_mode == 1)
 165                         append_mode = 2;
 166                 if (preserve_acls && !local_server) {
 167                         rprintf(FERROR,
 168                             "--acls requires protocol 30 or higher"
 169                             " (negotiated %d).\n",
 170                             protocol_version);
 171                         exit_cleanup(RERR_PROTOCOL);
 172                 }
 173                 if (preserve_xattrs && !local_server) {
 174                         rprintf(FERROR,
 175                             "--xattrs requires protocol 30 or higher"
 176                             " (negotiated %d).\n",
 177                             protocol_version);
 178                         exit_cleanup(RERR_PROTOCOL);
 179                 }
 180         }
 181
 182         if (delete_mode && !(delete_before+delete_during+delete_after)) {
 183                 if (protocol_version < 30)
 184                         delete_before = 1;
 185                 else
 186                         delete_during = 1;
 187         }
 188
 189         if (protocol_version < 29) {
 190                 if (fuzzy_basis) {
 191                         rprintf(FERROR,
 192                             "--fuzzy requires protocol 29 or higher"
 193                             " (negotiated %d).\n",
 194                             protocol_version);
 195                         exit_cleanup(RERR_PROTOCOL);
 196                 }
 197
 198                 if (basis_dir_cnt && inplace) {
 199                         rprintf(FERROR,
 200                             "%s with --inplace requires protocol 29 or higher"
 201                             " (negotiated %d).\n",
 202                             dest_option, protocol_version);
 203                         exit_cleanup(RERR_PROTOCOL);
 204                 }
 205
 206                 if (basis_dir_cnt > 1) {
 207                         rprintf(FERROR,
 208                             "Using more than one %s option requires protocol"
 209                             " 29 or higher (negotiated %d).\n",
 210                             dest_option, protocol_version);
 211                         exit_cleanup(RERR_PROTOCOL);
 212                 }
 213
 214                 if (prune_empty_dirs) {
 215                         rprintf(FERROR,
 216                             "--prune-empty-dirs requires protocol 29 or higher"
 217                             " (negotiated %d).\n",
 218                             protocol_version);
 219                         exit_cleanup(RERR_PROTOCOL);
 220                 }
 221         } else if (protocol_version >= 30) {
 222                 if (recurse && allow_inc_recurse
 223                  && !delete_before && !delete_after && !delay_updates
 224                  && !use_qsort && !prune_empty_dirs)
 225                         inc_recurse = 1;
 226                 need_messages_from_generator = 1;
 227         }
 228
 229 #ifdef ICONV_OPTION
 230         if (iconv_opt && (!am_sender || inc_recurse))
 231                 ic_ndx = ++file_extra_cnt;
 232 #endif
 233
 234         if (partial_dir && *partial_dir != '/' && (!am_server || local_server)) {
 235                 int flags = MATCHFLG_NO_PREFIXES | MATCHFLG_DIRECTORY;
 236                 if (!am_sender || protocol_version >= 30)
 237                         flags |= MATCHFLG_PERISHABLE;
 238                 parse_rule(&filter_list, partial_dir, flags, 0);
 239         }
 240
 241
 242 #ifdef ICONV_OPTION
 243         if (protect_args && files_from) {
 244                 if (am_sender)
 245                         filesfrom_convert = filesfrom_host && ic_send != (iconv_t)-1;
 246                 else
 247                         filesfrom_convert = !filesfrom_host && ic_recv != (iconv_t)-1;
 248         }
 249 #endif
 250
 251         if (am_server) {
 252                 if (!checksum_seed)
 253                         checksum_seed = time(NULL);
 254                 write_int(f_out, checksum_seed);
 255         } else {
 256                 checksum_seed = read_int(f_in);
 257         }
 258 }