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, 2005, 2006 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 2 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, write to the Free Software Foundation, Inc.,
20 * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
21 */
22
23#include "rsync.h"
24
25int remote_protocol = 0;
26
27extern int verbose;
28extern int am_server;
29extern int inplace;
30extern int fuzzy_basis;
31extern int read_batch;
32extern int checksum_seed;
33extern int basis_dir_cnt;
34extern int prune_empty_dirs;
35extern int protocol_version;
36extern char *dest_option;
37
38void setup_protocol(int f_out,int f_in)
39{
40	if (remote_protocol == 0) {
41		if (!read_batch)
42			write_int(f_out, protocol_version);
43		remote_protocol = read_int(f_in);
44		if (protocol_version > remote_protocol)
45			protocol_version = remote_protocol;
46	}
47	if (read_batch && remote_protocol > protocol_version) {
48	        rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n",
49			remote_protocol, protocol_version);
50		exit_cleanup(RERR_PROTOCOL);
51	}
52
53	if (verbose > 3) {
54		rprintf(FINFO, "(%s) Protocol versions: remote=%d, negotiated=%d\n",
55			am_server? "Server" : "Client", remote_protocol, protocol_version);
56	}
57	if (remote_protocol < MIN_PROTOCOL_VERSION
58	 || remote_protocol > MAX_PROTOCOL_VERSION) {
59		rprintf(FERROR,"protocol version mismatch -- is your shell clean?\n");
60		rprintf(FERROR,"(see the rsync man page for an explanation)\n");
61		exit_cleanup(RERR_PROTOCOL);
62	}
63	if (remote_protocol < OLD_PROTOCOL_VERSION) {
64		rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n",
65			am_server? "Client" : "Server");
66	}
67	if (protocol_version < MIN_PROTOCOL_VERSION) {
68		rprintf(FERROR, "--protocol must be at least %d on the %s.\n",
69			MIN_PROTOCOL_VERSION, am_server? "Server" : "Client");
70		exit_cleanup(RERR_PROTOCOL);
71	}
72	if (protocol_version > PROTOCOL_VERSION) {
73		rprintf(FERROR, "--protocol must be no more than %d on the %s.\n",
74			PROTOCOL_VERSION, am_server? "Server" : "Client");
75		exit_cleanup(RERR_PROTOCOL);
76	}
77
78	if (protocol_version < 29) {
79		if (fuzzy_basis) {
80			rprintf(FERROR,
81			    "--fuzzy requires protocol 29 or higher"
82			    " (negotiated %d).\n",
83			    protocol_version);
84			exit_cleanup(RERR_PROTOCOL);
85		}
86
87		if (basis_dir_cnt && inplace) {
88			rprintf(FERROR,
89			    "%s with --inplace requires protocol 29 or higher"
90			    " (negotiated %d).\n",
91			    dest_option, protocol_version);
92			exit_cleanup(RERR_PROTOCOL);
93		}
94
95		if (basis_dir_cnt > 1) {
96			rprintf(FERROR,
97			    "Using more than one %s option requires protocol"
98			    " 29 or higher (negotiated %d).\n",
99			    dest_option, protocol_version);
100			exit_cleanup(RERR_PROTOCOL);
101		}
102
103		if (prune_empty_dirs) {
104			rprintf(FERROR,
105			    "--prune-empty-dirs requires protocol 29 or higher"
106			    " (negotiated %d).\n",
107			    protocol_version);
108			exit_cleanup(RERR_PROTOCOL);
109		}
110	}
111
112	if (am_server) {
113		if (!checksum_seed)
114			checksum_seed = time(NULL);
115		write_int(f_out, checksum_seed);
116	} else {
117		checksum_seed = read_int(f_in);
118	}
119}
120