2 * Compatibility routines for older rsync protocol versions.
4 * Copyright (C) Andrew Tridgell 1996
5 * Copyright (C) Paul Mackerras 1996
6 * Copyright (C) 2004-2019 Wayne Davison
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.
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.
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.
24 int remote_protocol = 0;
25 int file_extra_cnt = 0; /* count of file-list extras that everyone gets */
28 int use_safe_inc_flist = 0;
29 int want_xattr_optim = 0;
30 int proper_seed_order = 0;
34 extern int local_server;
38 extern int allow_inc_recurse;
39 extern int preallocate_files;
40 extern int append_mode;
41 extern int fuzzy_basis;
42 extern int read_batch;
43 extern int delay_updates;
44 extern int checksum_seed;
45 extern int basis_dir_cnt;
46 extern int prune_empty_dirs;
47 extern int protocol_version;
48 extern int protect_args;
49 extern int preserve_uid;
50 extern int preserve_gid;
51 extern int preserve_acls;
52 extern int preserve_xattrs;
53 extern int need_messages_from_generator;
54 extern int delete_mode, delete_before, delete_during, delete_after;
55 extern char *shell_cmd;
56 extern char *partial_dir;
57 extern char *dest_option;
58 extern char *files_from;
59 extern char *filesfrom_host;
60 extern filter_rule_list filter_list;
61 extern int need_unsorted_flist;
63 extern iconv_t ic_send, ic_recv;
64 extern char *iconv_opt;
67 /* These index values are for the file-list's extra-attribute array. */
68 int uid_ndx, gid_ndx, acls_ndx, xattrs_ndx, unsort_ndx;
70 int receiver_symlink_times = 0; /* receiver can set the time on a symlink */
71 int sender_symlink_iconv = 0; /* sender should convert symlink content */
74 int filesfrom_convert = 0;
77 #define CF_INC_RECURSE (1<<0)
78 #define CF_SYMLINK_TIMES (1<<1)
79 #define CF_SYMLINK_ICONV (1<<2)
80 #define CF_SAFE_FLIST (1<<3)
81 #define CF_AVOID_XATTR_OPTIM (1<<4)
82 #define CF_CHKSUM_SEED_FIX (1<<5)
84 static const char *client_info;
86 /* The server makes sure that if either side only supports a pre-release
87 * version of a protocol, that both sides must speak a compatible version
88 * of that protocol for it to be advertised as available. */
89 static void check_sub_protocol(void)
92 int their_protocol, their_sub;
93 #if SUBPROTOCOL_VERSION != 0
94 int our_sub = protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION;
99 /* client_info starts with VER.SUB string if client is a pre-release. */
100 if (!(their_protocol = atoi(client_info))
101 || !(dot = strchr(client_info, '.'))
102 || !(their_sub = atoi(dot+1))) {
103 #if SUBPROTOCOL_VERSION != 0
110 if (their_protocol < protocol_version) {
112 protocol_version = their_protocol - 1;
116 if (their_protocol > protocol_version)
117 their_sub = 0; /* 0 == final version of older protocol */
118 if (their_sub != our_sub)
122 void set_allow_inc_recurse(void)
124 client_info = shell_cmd ? shell_cmd : "";
126 if (!recurse || use_qsort)
127 allow_inc_recurse = 0;
129 && (delete_before || delete_after
130 || delay_updates || prune_empty_dirs))
131 allow_inc_recurse = 0;
132 else if (am_server && !local_server
133 && (strchr(client_info, 'i') == NULL))
134 allow_inc_recurse = 0;
137 void setup_protocol(int f_out,int f_in)
140 file_extra_cnt += PTR_EXTRA_CNT;
144 uid_ndx = ++file_extra_cnt;
146 gid_ndx = ++file_extra_cnt;
147 if (preserve_acls && !am_sender)
148 acls_ndx = ++file_extra_cnt;
150 xattrs_ndx = ++file_extra_cnt;
153 set_allow_inc_recurse();
155 if (remote_protocol == 0) {
156 if (am_server && !local_server)
157 check_sub_protocol();
159 write_int(f_out, protocol_version);
160 remote_protocol = read_int(f_in);
161 if (protocol_version > remote_protocol)
162 protocol_version = remote_protocol;
164 if (read_batch && remote_protocol > protocol_version) {
165 rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n",
166 remote_protocol, protocol_version);
167 exit_cleanup(RERR_PROTOCOL);
170 if (DEBUG_GTE(PROTO, 1)) {
171 rprintf(FINFO, "(%s) Protocol versions: remote=%d, negotiated=%d\n",
172 am_server? "Server" : "Client", remote_protocol, protocol_version);
174 if (remote_protocol < MIN_PROTOCOL_VERSION
175 || remote_protocol > MAX_PROTOCOL_VERSION) {
176 rprintf(FERROR,"protocol version mismatch -- is your shell clean?\n");
177 rprintf(FERROR,"(see the rsync man page for an explanation)\n");
178 exit_cleanup(RERR_PROTOCOL);
180 if (remote_protocol < OLD_PROTOCOL_VERSION) {
181 rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n",
182 am_server? "Client" : "Server");
184 if (protocol_version < MIN_PROTOCOL_VERSION) {
185 rprintf(FERROR, "--protocol must be at least %d on the %s.\n",
186 MIN_PROTOCOL_VERSION, am_server? "Server" : "Client");
187 exit_cleanup(RERR_PROTOCOL);
189 if (protocol_version > PROTOCOL_VERSION) {
190 rprintf(FERROR, "--protocol must be no more than %d on the %s.\n",
191 PROTOCOL_VERSION, am_server? "Server" : "Client");
192 exit_cleanup(RERR_PROTOCOL);
197 #ifndef SUPPORT_PREALLOCATION
198 if (preallocate_files && !am_sender) {
199 rprintf(FERROR, "preallocation is not supported on this %s\n",
200 am_server ? "Server" : "Client");
201 exit_cleanup(RERR_SYNTAX);
205 if (protocol_version < 30) {
206 if (append_mode == 1)
208 if (preserve_acls && !local_server) {
210 "--acls requires protocol 30 or higher"
211 " (negotiated %d).\n",
213 exit_cleanup(RERR_PROTOCOL);
215 if (preserve_xattrs && !local_server) {
217 "--xattrs requires protocol 30 or higher"
218 " (negotiated %d).\n",
220 exit_cleanup(RERR_PROTOCOL);
224 if (delete_mode && !(delete_before+delete_during+delete_after)) {
225 if (protocol_version < 30)
231 if (protocol_version < 29) {
234 "--fuzzy requires protocol 29 or higher"
235 " (negotiated %d).\n",
237 exit_cleanup(RERR_PROTOCOL);
240 if (basis_dir_cnt && inplace) {
242 "%s with --inplace requires protocol 29 or higher"
243 " (negotiated %d).\n",
244 dest_option, protocol_version);
245 exit_cleanup(RERR_PROTOCOL);
248 if (basis_dir_cnt > 1) {
250 "Using more than one %s option requires protocol"
251 " 29 or higher (negotiated %d).\n",
252 dest_option, protocol_version);
253 exit_cleanup(RERR_PROTOCOL);
256 if (prune_empty_dirs) {
258 "--prune-empty-dirs requires protocol 29 or higher"
259 " (negotiated %d).\n",
261 exit_cleanup(RERR_PROTOCOL);
263 } else if (protocol_version >= 30) {
265 compat_flags = allow_inc_recurse ? CF_INC_RECURSE : 0;
266 #ifdef CAN_SET_SYMLINK_TIMES
267 compat_flags |= CF_SYMLINK_TIMES;
270 compat_flags |= CF_SYMLINK_ICONV;
272 if (local_server || strchr(client_info, 'f') != NULL)
273 compat_flags |= CF_SAFE_FLIST;
274 if (local_server || strchr(client_info, 'x') != NULL)
275 compat_flags |= CF_AVOID_XATTR_OPTIM;
276 if (local_server || strchr(client_info, 'C') != NULL)
277 compat_flags |= CF_CHKSUM_SEED_FIX;
278 write_byte(f_out, compat_flags);
280 compat_flags = read_byte(f_in);
281 /* The inc_recurse var MUST be set to 0 or 1. */
282 inc_recurse = compat_flags & CF_INC_RECURSE ? 1 : 0;
283 want_xattr_optim = protocol_version >= 31 && !(compat_flags & CF_AVOID_XATTR_OPTIM);
284 proper_seed_order = compat_flags & CF_CHKSUM_SEED_FIX ? 1 : 0;
286 receiver_symlink_times = am_server
287 ? strchr(client_info, 'L') != NULL
288 : !!(compat_flags & CF_SYMLINK_TIMES);
290 #ifdef CAN_SET_SYMLINK_TIMES
292 receiver_symlink_times = 1;
295 sender_symlink_iconv = iconv_opt && (am_server
296 ? local_server || strchr(client_info, 's') != NULL
297 : !!(compat_flags & CF_SYMLINK_ICONV));
299 if (inc_recurse && !allow_inc_recurse) {
300 /* This should only be able to happen in a batch. */
302 "Incompatible options specified for inc-recursive %s.\n",
303 read_batch ? "batch file" : "connection");
304 exit_cleanup(RERR_SYNTAX);
306 use_safe_inc_flist = (compat_flags & CF_SAFE_FLIST) || protocol_version >= 31;
307 need_messages_from_generator = 1;
308 #ifdef CAN_SET_SYMLINK_TIMES
309 } else if (!am_sender) {
310 receiver_symlink_times = 1;
314 if (need_unsorted_flist && (!am_sender || inc_recurse))
315 unsort_ndx = ++file_extra_cnt;
317 if (partial_dir && *partial_dir != '/' && (!am_server || local_server)) {
318 int rflags = FILTRULE_NO_PREFIXES | FILTRULE_DIRECTORY;
319 if (!am_sender || protocol_version >= 30)
320 rflags |= FILTRULE_PERISHABLE;
321 parse_filter_str(&filter_list, partial_dir, rule_template(rflags), 0);
326 if (protect_args && files_from) {
328 filesfrom_convert = filesfrom_host && ic_send != (iconv_t)-1;
330 filesfrom_convert = !filesfrom_host && ic_recv != (iconv_t)-1;
336 checksum_seed = time(NULL) ^ (getpid() << 6);
337 write_int(f_out, checksum_seed);
339 checksum_seed = read_int(f_in);