| 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 *shell_cmd; /* contains VER.SUB string if client is a pre-release */ |
| 53 | extern char *backup_dir, *backup_suffix; |
| 54 | extern char *partial_dir; |
| 55 | extern char *dest_option; |
| 56 | extern struct filter_list_struct filter_list; |
| 57 | |
| 58 | /* The server makes sure that if either side only supports a pre-release |
| 59 | * version of a protocol, that both sides must speak a compatible version |
| 60 | * of that protocol for it to be advertised as available. */ |
| 61 | static void check_sub_protocol(void) |
| 62 | { |
| 63 | char *dot; |
| 64 | int their_protocol, their_sub; |
| 65 | int our_sub = protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION; |
| 66 | |
| 67 | if (!shell_cmd || !(dot = strchr(shell_cmd, '.')) |
| 68 | || !(their_protocol = atoi(shell_cmd)) |
| 69 | || !(their_sub = atoi(dot+1))) { |
| 70 | if (our_sub) |
| 71 | protocol_version--; |
| 72 | return; |
| 73 | } |
| 74 | |
| 75 | if (their_protocol < protocol_version) { |
| 76 | if (their_sub) |
| 77 | protocol_version = their_protocol - 1; |
| 78 | return; |
| 79 | } |
| 80 | |
| 81 | if (their_protocol > protocol_version) |
| 82 | their_sub = 0; /* 0 == final version */ |
| 83 | if (their_sub != our_sub) |
| 84 | protocol_version--; |
| 85 | } |
| 86 | |
| 87 | void setup_protocol(int f_out,int f_in) |
| 88 | { |
| 89 | if (am_sender) |
| 90 | file_extra_cnt += PTR_EXTRA_LEN; |
| 91 | else |
| 92 | file_extra_cnt++; |
| 93 | if (preserve_uid) |
| 94 | preserve_uid = ++file_extra_cnt; |
| 95 | if (preserve_gid) |
| 96 | preserve_gid = ++file_extra_cnt; |
| 97 | if (preserve_acls && !am_sender) |
| 98 | preserve_acls = ++file_extra_cnt; |
| 99 | if (preserve_xattrs) |
| 100 | preserve_xattrs = ++file_extra_cnt; |
| 101 | |
| 102 | if (remote_protocol == 0) { |
| 103 | if (am_server && !local_server) |
| 104 | check_sub_protocol(); |
| 105 | if (!read_batch) |
| 106 | write_int(f_out, protocol_version); |
| 107 | remote_protocol = read_int(f_in); |
| 108 | if (protocol_version > remote_protocol) |
| 109 | protocol_version = remote_protocol; |
| 110 | } |
| 111 | if (read_batch && remote_protocol > protocol_version) { |
| 112 | rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n", |
| 113 | remote_protocol, protocol_version); |
| 114 | exit_cleanup(RERR_PROTOCOL); |
| 115 | } |
| 116 | |
| 117 | if (verbose > 3) { |
| 118 | rprintf(FINFO, "(%s) Protocol versions: remote=%d, negotiated=%d\n", |
| 119 | am_server? "Server" : "Client", remote_protocol, protocol_version); |
| 120 | } |
| 121 | if (remote_protocol < MIN_PROTOCOL_VERSION |
| 122 | || remote_protocol > MAX_PROTOCOL_VERSION) { |
| 123 | rprintf(FERROR,"protocol version mismatch -- is your shell clean?\n"); |
| 124 | rprintf(FERROR,"(see the rsync man page for an explanation)\n"); |
| 125 | exit_cleanup(RERR_PROTOCOL); |
| 126 | } |
| 127 | if (remote_protocol < OLD_PROTOCOL_VERSION) { |
| 128 | rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n", |
| 129 | am_server? "Client" : "Server"); |
| 130 | } |
| 131 | if (protocol_version < MIN_PROTOCOL_VERSION) { |
| 132 | rprintf(FERROR, "--protocol must be at least %d on the %s.\n", |
| 133 | MIN_PROTOCOL_VERSION, am_server? "Server" : "Client"); |
| 134 | exit_cleanup(RERR_PROTOCOL); |
| 135 | } |
| 136 | if (protocol_version > PROTOCOL_VERSION) { |
| 137 | rprintf(FERROR, "--protocol must be no more than %d on the %s.\n", |
| 138 | PROTOCOL_VERSION, am_server? "Server" : "Client"); |
| 139 | exit_cleanup(RERR_PROTOCOL); |
| 140 | } |
| 141 | |
| 142 | if (protocol_version < 30) { |
| 143 | if (max_delete == 0 && am_sender) { |
| 144 | rprintf(FERROR, |
| 145 | "--max-delete=0 requires protocol 30 or higher" |
| 146 | " (negotiated %d).\n", |
| 147 | protocol_version); |
| 148 | exit_cleanup(RERR_PROTOCOL); |
| 149 | } |
| 150 | if (preserve_acls && !local_server) { |
| 151 | rprintf(FERROR, |
| 152 | "--acls requires protocol 30 or higher" |
| 153 | " (negotiated %d).\n", |
| 154 | protocol_version); |
| 155 | exit_cleanup(RERR_PROTOCOL); |
| 156 | } |
| 157 | if (preserve_xattrs && !local_server) { |
| 158 | rprintf(FERROR, |
| 159 | "--xattrs requires protocol 30 or higher" |
| 160 | " (negotiated %d).\n", |
| 161 | protocol_version); |
| 162 | exit_cleanup(RERR_PROTOCOL); |
| 163 | } |
| 164 | } |
| 165 | |
| 166 | if (delete_mode && !(delete_before+delete_during+delete_after)) { |
| 167 | if (protocol_version < 30) |
| 168 | delete_before = 1; |
| 169 | else |
| 170 | delete_during = 1; |
| 171 | } |
| 172 | |
| 173 | if (protocol_version < 29) { |
| 174 | if (fuzzy_basis) { |
| 175 | rprintf(FERROR, |
| 176 | "--fuzzy requires protocol 29 or higher" |
| 177 | " (negotiated %d).\n", |
| 178 | protocol_version); |
| 179 | exit_cleanup(RERR_PROTOCOL); |
| 180 | } |
| 181 | |
| 182 | if (basis_dir_cnt && inplace) { |
| 183 | rprintf(FERROR, |
| 184 | "%s with --inplace requires protocol 29 or higher" |
| 185 | " (negotiated %d).\n", |
| 186 | dest_option, protocol_version); |
| 187 | exit_cleanup(RERR_PROTOCOL); |
| 188 | } |
| 189 | |
| 190 | if (basis_dir_cnt > 1) { |
| 191 | rprintf(FERROR, |
| 192 | "Using more than one %s option requires protocol" |
| 193 | " 29 or higher (negotiated %d).\n", |
| 194 | dest_option, protocol_version); |
| 195 | exit_cleanup(RERR_PROTOCOL); |
| 196 | } |
| 197 | |
| 198 | if (prune_empty_dirs) { |
| 199 | rprintf(FERROR, |
| 200 | "--prune-empty-dirs requires protocol 29 or higher" |
| 201 | " (negotiated %d).\n", |
| 202 | protocol_version); |
| 203 | exit_cleanup(RERR_PROTOCOL); |
| 204 | } |
| 205 | } else if (protocol_version >= 30) { |
| 206 | if (recurse && allow_inc_recurse && !preserve_hard_links |
| 207 | && !delete_before && !delete_after && !delay_updates |
| 208 | && !prune_empty_dirs) |
| 209 | inc_recurse = 1; |
| 210 | need_messages_from_generator = 1; |
| 211 | } |
| 212 | |
| 213 | if (partial_dir && *partial_dir != '/' && (!am_server || local_server)) { |
| 214 | int flags = MATCHFLG_NO_PREFIXES | MATCHFLG_DIRECTORY; |
| 215 | if (!am_sender || protocol_version >= 30) |
| 216 | flags |= MATCHFLG_PERISHABLE; |
| 217 | parse_rule(&filter_list, partial_dir, flags, 0); |
| 218 | } |
| 219 | |
| 220 | if (am_server) { |
| 221 | if (!checksum_seed) |
| 222 | checksum_seed = time(NULL); |
| 223 | write_int(f_out, checksum_seed); |
| 224 | } else { |
| 225 | checksum_seed = read_int(f_in); |
| 226 | } |
| 227 | } |