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 append_mode;
  38 extern int fuzzy_basis;
  39 extern int read_batch;
  40 extern int implied_dirs;
  41 extern int delay_updates;
  42 extern int checksum_seed;
  43 extern int basis_dir_cnt;
  44 extern int prune_empty_dirs;
  45 extern int protocol_version;
  46 extern int preserve_uid;
  47 extern int preserve_gid;
  48 extern int preserve_acls;
  49 extern int preserve_xattrs;
  50 extern int preserve_hard_links;
  51 extern int need_messages_from_generator;
  52 extern int delete_mode, delete_before, delete_during, delete_after;
  53 extern int delete_excluded;
  54 extern int make_backups;
  55 extern char *shell_cmd; /* contains VER.SUB string if client is a pre-release */
  56 extern char *backup_dir, *backup_suffix;
  57 extern char *partial_dir;
  58 extern char *dest_option;
  59 extern struct filter_list_struct filter_list;
  60
  61 /* These index values are for the file-list's extra-attribute array. */
  62 int uid_ndx, gid_ndx, acls_ndx, xattrs_ndx;
  63
  64 /* The server makes sure that if either side only supports a pre-release
  65  * version of a protocol, that both sides must speak a compatible version
  66  * of that protocol for it to be advertised as available. */
  67 static void check_sub_protocol(void)
  68 {
  69         char *dot;
  70         int their_protocol, their_sub;
  71         int our_sub = protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION;
  72
  73         if (!shell_cmd || !(dot = strchr(shell_cmd, '.'))
  74          || !(their_protocol = atoi(shell_cmd))
  75          || !(their_sub = atoi(dot+1))) {
  76                 if (our_sub)
  77                         protocol_version--;
  78                 return;
  79         }
  80
  81         if (their_protocol < protocol_version) {
  82                 if (their_sub)
  83                         protocol_version = their_protocol - 1;
  84                 return;
  85         }
  86
  87         if (their_protocol > protocol_version)
  88                 their_sub = 0; /* 0 == final version */
  89         if (their_sub != our_sub)
  90                 protocol_version--;
  91 }
  92
  93 void setup_protocol(int f_out,int f_in)
  94 {
  95         if (am_sender)
  96                 file_extra_cnt += PTR_EXTRA_LEN;
  97         else
  98                 file_extra_cnt++;
  99         if (preserve_uid)
 100                 uid_ndx = ++file_extra_cnt;
 101         if (preserve_gid)
 102                 gid_ndx = ++file_extra_cnt;
 103         if (preserve_acls && !am_sender)
 104                 acls_ndx = ++file_extra_cnt;
 105         if (preserve_xattrs)
 106                 xattrs_ndx = ++file_extra_cnt;
 107
 108         if (remote_protocol == 0) {
 109                 if (am_server && !local_server)
 110                         check_sub_protocol();
 111                 if (!read_batch)
 112                         write_int(f_out, protocol_version);
 113                 remote_protocol = read_int(f_in);
 114                 if (protocol_version > remote_protocol)
 115                         protocol_version = remote_protocol;
 116         }
 117         if (read_batch && remote_protocol > protocol_version) {
 118                 rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n",
 119                         remote_protocol, protocol_version);
 120                 exit_cleanup(RERR_PROTOCOL);
 121         }
 122
 123         if (verbose > 3) {
 124                 rprintf(FINFO, "(%s) Protocol versions: remote=%d, negotiated=%d\n",
 125                         am_server? "Server" : "Client", remote_protocol, protocol_version);
 126         }
 127         if (remote_protocol < MIN_PROTOCOL_VERSION
 128          || remote_protocol > MAX_PROTOCOL_VERSION) {
 129                 rprintf(FERROR,"protocol version mismatch -- is your shell clean?\n");
 130                 rprintf(FERROR,"(see the rsync man page for an explanation)\n");
 131                 exit_cleanup(RERR_PROTOCOL);
 132         }
 133         if (remote_protocol < OLD_PROTOCOL_VERSION) {
 134                 rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n",
 135                         am_server? "Client" : "Server");
 136         }
 137         if (protocol_version < MIN_PROTOCOL_VERSION) {
 138                 rprintf(FERROR, "--protocol must be at least %d on the %s.\n",
 139                         MIN_PROTOCOL_VERSION, am_server? "Server" : "Client");
 140                 exit_cleanup(RERR_PROTOCOL);
 141         }
 142         if (protocol_version > PROTOCOL_VERSION) {
 143                 rprintf(FERROR, "--protocol must be no more than %d on the %s.\n",
 144                         PROTOCOL_VERSION, am_server? "Server" : "Client");
 145                 exit_cleanup(RERR_PROTOCOL);
 146         }
 147
 148         if (protocol_version < 30) {
 149                 if (append_mode == 1)
 150                         append_mode = 2;
 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                  && (!relative_paths || implied_dirs) && !use_qsort
 210                  && !prune_empty_dirs)
 211                         inc_recurse = 1;
 212                 need_messages_from_generator = 1;
 213         }
 214
 215         if (partial_dir && *partial_dir != '/' && (!am_server || local_server)) {
 216                 int flags = MATCHFLG_NO_PREFIXES | MATCHFLG_DIRECTORY;
 217                 if (!am_sender || protocol_version >= 30)
 218                         flags |= MATCHFLG_PERISHABLE;
 219                 parse_rule(&filter_list, partial_dir, flags, 0);
 220         }
 221
 222         if (am_server) {
 223                 if (!checksum_seed)
 224                         checksum_seed = time(NULL);
 225                 write_int(f_out, checksum_seed);
 226         } else {
 227                 checksum_seed = read_int(f_in);
 228         }
 229 }