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