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