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