| 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) 2004-2009 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 am_server; |
| 29 | extern int am_sender; |
| 30 | extern int local_server; |
| 31 | extern int inplace; |
| 32 | extern int recurse; |
| 33 | extern int use_qsort; |
| 34 | extern int allow_inc_recurse; |
| 35 | extern int append_mode; |
| 36 | extern int fuzzy_basis; |
| 37 | extern int read_batch; |
| 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 protect_args; |
| 44 | extern int preserve_uid; |
| 45 | extern int preserve_gid; |
| 46 | extern int preserve_acls; |
| 47 | extern int preserve_xattrs; |
| 48 | extern int need_messages_from_generator; |
| 49 | extern int delete_mode, delete_before, delete_during, delete_after; |
| 50 | extern char *shell_cmd; |
| 51 | extern char *partial_dir; |
| 52 | extern char *dest_option; |
| 53 | extern char *files_from; |
| 54 | extern char *filesfrom_host; |
| 55 | extern filter_rule_list filter_list; |
| 56 | extern int need_unsorted_flist; |
| 57 | #ifdef ICONV_OPTION |
| 58 | extern iconv_t ic_send, ic_recv; |
| 59 | extern char *iconv_opt; |
| 60 | #endif |
| 61 | |
| 62 | /* These index values are for the file-list's extra-attribute array. */ |
| 63 | int uid_ndx, gid_ndx, acls_ndx, xattrs_ndx, unsort_ndx; |
| 64 | |
| 65 | int receiver_symlink_times = 0; /* receiver can set the time on a symlink */ |
| 66 | int sender_symlink_iconv = 0; /* sender should convert symlink content */ |
| 67 | |
| 68 | #ifdef ICONV_OPTION |
| 69 | int filesfrom_convert = 0; |
| 70 | #endif |
| 71 | |
| 72 | #define CF_INC_RECURSE (1<<0) |
| 73 | #define CF_SYMLINK_TIMES (1<<1) |
| 74 | #define CF_SYMLINK_ICONV (1<<2) |
| 75 | |
| 76 | static const char *client_info; |
| 77 | |
| 78 | /* The server makes sure that if either side only supports a pre-release |
| 79 | * version of a protocol, that both sides must speak a compatible version |
| 80 | * of that protocol for it to be advertised as available. */ |
| 81 | static void check_sub_protocol(void) |
| 82 | { |
| 83 | char *dot; |
| 84 | int their_protocol, their_sub; |
| 85 | #if SUBPROTOCOL_VERSION != 0 |
| 86 | int our_sub = protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION; |
| 87 | #else |
| 88 | int our_sub = 0; |
| 89 | #endif |
| 90 | |
| 91 | /* client_info starts with VER.SUB string if client is a pre-release. */ |
| 92 | if (!(their_protocol = atoi(client_info)) |
| 93 | || !(dot = strchr(client_info, '.')) |
| 94 | || !(their_sub = atoi(dot+1))) { |
| 95 | #if SUBPROTOCOL_VERSION != 0 |
| 96 | if (our_sub) |
| 97 | protocol_version--; |
| 98 | #endif |
| 99 | return; |
| 100 | } |
| 101 | |
| 102 | if (their_protocol < protocol_version) { |
| 103 | if (their_sub) |
| 104 | protocol_version = their_protocol - 1; |
| 105 | return; |
| 106 | } |
| 107 | |
| 108 | if (their_protocol > protocol_version) |
| 109 | their_sub = 0; /* 0 == final version of older protocol */ |
| 110 | if (their_sub != our_sub) |
| 111 | protocol_version--; |
| 112 | } |
| 113 | |
| 114 | void set_allow_inc_recurse(void) |
| 115 | { |
| 116 | client_info = shell_cmd ? shell_cmd : ""; |
| 117 | |
| 118 | if (!recurse || use_qsort) |
| 119 | allow_inc_recurse = 0; |
| 120 | else if (!am_sender |
| 121 | && (delete_before || delete_after |
| 122 | || delay_updates || prune_empty_dirs)) |
| 123 | allow_inc_recurse = 0; |
| 124 | else if (am_server && !local_server |
| 125 | && (strchr(client_info, 'i') == NULL)) |
| 126 | allow_inc_recurse = 0; |
| 127 | } |
| 128 | |
| 129 | void setup_protocol(int f_out,int f_in) |
| 130 | { |
| 131 | if (am_sender) |
| 132 | file_extra_cnt += PTR_EXTRA_CNT; |
| 133 | else |
| 134 | file_extra_cnt++; |
| 135 | if (preserve_uid) |
| 136 | uid_ndx = ++file_extra_cnt; |
| 137 | if (preserve_gid) |
| 138 | gid_ndx = ++file_extra_cnt; |
| 139 | if (preserve_acls && !am_sender) |
| 140 | acls_ndx = ++file_extra_cnt; |
| 141 | if (preserve_xattrs) |
| 142 | xattrs_ndx = ++file_extra_cnt; |
| 143 | |
| 144 | if (am_server) |
| 145 | set_allow_inc_recurse(); |
| 146 | |
| 147 | if (remote_protocol == 0) { |
| 148 | if (am_server && !local_server) |
| 149 | check_sub_protocol(); |
| 150 | if (!read_batch) |
| 151 | write_int(f_out, protocol_version); |
| 152 | remote_protocol = read_int(f_in); |
| 153 | if (protocol_version > remote_protocol) |
| 154 | protocol_version = remote_protocol; |
| 155 | } |
| 156 | if (read_batch && remote_protocol > protocol_version) { |
| 157 | rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n", |
| 158 | remote_protocol, protocol_version); |
| 159 | exit_cleanup(RERR_PROTOCOL); |
| 160 | } |
| 161 | |
| 162 | if (DEBUG_GTE(PROTO, 1)) { |
| 163 | rprintf(FINFO, "(%s) Protocol versions: remote=%d, negotiated=%d\n", |
| 164 | am_server? "Server" : "Client", remote_protocol, protocol_version); |
| 165 | } |
| 166 | if (remote_protocol < MIN_PROTOCOL_VERSION |
| 167 | || remote_protocol > MAX_PROTOCOL_VERSION) { |
| 168 | rprintf(FERROR,"protocol version mismatch -- is your shell clean?\n"); |
| 169 | rprintf(FERROR,"(see the rsync man page for an explanation)\n"); |
| 170 | exit_cleanup(RERR_PROTOCOL); |
| 171 | } |
| 172 | if (remote_protocol < OLD_PROTOCOL_VERSION) { |
| 173 | rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n", |
| 174 | am_server? "Client" : "Server"); |
| 175 | } |
| 176 | if (protocol_version < MIN_PROTOCOL_VERSION) { |
| 177 | rprintf(FERROR, "--protocol must be at least %d on the %s.\n", |
| 178 | MIN_PROTOCOL_VERSION, am_server? "Server" : "Client"); |
| 179 | exit_cleanup(RERR_PROTOCOL); |
| 180 | } |
| 181 | if (protocol_version > PROTOCOL_VERSION) { |
| 182 | rprintf(FERROR, "--protocol must be no more than %d on the %s.\n", |
| 183 | PROTOCOL_VERSION, am_server? "Server" : "Client"); |
| 184 | exit_cleanup(RERR_PROTOCOL); |
| 185 | } |
| 186 | if (read_batch) |
| 187 | check_batch_flags(); |
| 188 | |
| 189 | if (protocol_version < 30) { |
| 190 | if (append_mode == 1) |
| 191 | append_mode = 2; |
| 192 | if (preserve_acls && !local_server) { |
| 193 | rprintf(FERROR, |
| 194 | "--acls requires protocol 30 or higher" |
| 195 | " (negotiated %d).\n", |
| 196 | protocol_version); |
| 197 | exit_cleanup(RERR_PROTOCOL); |
| 198 | } |
| 199 | if (preserve_xattrs && !local_server) { |
| 200 | rprintf(FERROR, |
| 201 | "--xattrs requires protocol 30 or higher" |
| 202 | " (negotiated %d).\n", |
| 203 | protocol_version); |
| 204 | exit_cleanup(RERR_PROTOCOL); |
| 205 | } |
| 206 | } |
| 207 | |
| 208 | if (delete_mode && !(delete_before+delete_during+delete_after)) { |
| 209 | if (protocol_version < 30) |
| 210 | delete_before = 1; |
| 211 | else |
| 212 | delete_during = 1; |
| 213 | } |
| 214 | |
| 215 | if (protocol_version < 29) { |
| 216 | if (fuzzy_basis) { |
| 217 | rprintf(FERROR, |
| 218 | "--fuzzy requires protocol 29 or higher" |
| 219 | " (negotiated %d).\n", |
| 220 | protocol_version); |
| 221 | exit_cleanup(RERR_PROTOCOL); |
| 222 | } |
| 223 | |
| 224 | if (basis_dir_cnt && inplace) { |
| 225 | rprintf(FERROR, |
| 226 | "%s with --inplace requires protocol 29 or higher" |
| 227 | " (negotiated %d).\n", |
| 228 | dest_option, protocol_version); |
| 229 | exit_cleanup(RERR_PROTOCOL); |
| 230 | } |
| 231 | |
| 232 | if (basis_dir_cnt > 1) { |
| 233 | rprintf(FERROR, |
| 234 | "Using more than one %s option requires protocol" |
| 235 | " 29 or higher (negotiated %d).\n", |
| 236 | dest_option, protocol_version); |
| 237 | exit_cleanup(RERR_PROTOCOL); |
| 238 | } |
| 239 | |
| 240 | if (prune_empty_dirs) { |
| 241 | rprintf(FERROR, |
| 242 | "--prune-empty-dirs requires protocol 29 or higher" |
| 243 | " (negotiated %d).\n", |
| 244 | protocol_version); |
| 245 | exit_cleanup(RERR_PROTOCOL); |
| 246 | } |
| 247 | } else if (protocol_version >= 30) { |
| 248 | int compat_flags; |
| 249 | if (am_server) { |
| 250 | compat_flags = allow_inc_recurse ? CF_INC_RECURSE : 0; |
| 251 | #ifdef CAN_SET_SYMLINK_TIMES |
| 252 | compat_flags |= CF_SYMLINK_TIMES; |
| 253 | #endif |
| 254 | #ifdef ICONV_OPTION |
| 255 | compat_flags |= CF_SYMLINK_ICONV; |
| 256 | #endif |
| 257 | write_byte(f_out, compat_flags); |
| 258 | } else { |
| 259 | compat_flags = read_byte(f_in); |
| 260 | } |
| 261 | /* The inc_recurse var MUST be set to 0 or 1. */ |
| 262 | inc_recurse = compat_flags & CF_INC_RECURSE ? 1 : 0; |
| 263 | if (am_sender) { |
| 264 | receiver_symlink_times = am_server |
| 265 | ? strchr(client_info, 'L') != NULL |
| 266 | : !!(compat_flags & CF_SYMLINK_TIMES); |
| 267 | } |
| 268 | #ifdef CAN_SET_SYMLINK_TIMES |
| 269 | else |
| 270 | receiver_symlink_times = 1; |
| 271 | #endif |
| 272 | #ifdef ICONV_OPTION |
| 273 | sender_symlink_iconv = iconv_opt && (am_server |
| 274 | ? local_server || strchr(client_info, 's') != NULL |
| 275 | : !!(compat_flags & CF_SYMLINK_ICONV)); |
| 276 | #endif |
| 277 | if (inc_recurse && !allow_inc_recurse) { |
| 278 | /* This should only be able to happen in a batch. */ |
| 279 | fprintf(stderr, |
| 280 | "Incompatible options specified for inc-recursive %s.\n", |
| 281 | read_batch ? "batch file" : "connection"); |
| 282 | exit_cleanup(RERR_SYNTAX); |
| 283 | } |
| 284 | need_messages_from_generator = 1; |
| 285 | #ifdef CAN_SET_SYMLINK_TIMES |
| 286 | } else if (!am_sender) { |
| 287 | receiver_symlink_times = 1; |
| 288 | #endif |
| 289 | } |
| 290 | |
| 291 | if (need_unsorted_flist && (!am_sender || inc_recurse)) |
| 292 | unsort_ndx = ++file_extra_cnt; |
| 293 | |
| 294 | if (partial_dir && *partial_dir != '/' && (!am_server || local_server)) { |
| 295 | int rflags = FILTRULE_NO_PREFIXES | FILTRULE_DIRECTORY; |
| 296 | if (!am_sender || protocol_version >= 30) |
| 297 | rflags |= FILTRULE_PERISHABLE; |
| 298 | parse_filter_str(&filter_list, partial_dir, rule_template(rflags), 0); |
| 299 | } |
| 300 | |
| 301 | |
| 302 | #ifdef ICONV_OPTION |
| 303 | if (protect_args && files_from) { |
| 304 | if (am_sender) |
| 305 | filesfrom_convert = filesfrom_host && ic_send != (iconv_t)-1; |
| 306 | else |
| 307 | filesfrom_convert = !filesfrom_host && ic_recv != (iconv_t)-1; |
| 308 | } |
| 309 | #endif |
| 310 | |
| 311 | if (am_server) { |
| 312 | if (!checksum_seed) |
| 313 | checksum_seed = time(NULL); |
| 314 | write_int(f_out, checksum_seed); |
| 315 | } else { |
| 316 | checksum_seed = read_int(f_in); |
| 317 | } |
| 318 | } |