compat.c revision 60573 
1/*
2 * Copyright (c) 1999 Markus Friedl.  All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 * 3. All advertising materials mentioning features or use of this software
13 *    must display the following acknowledgement:
14 *      This product includes software developed by Markus Friedl.
15 * 4. The name of the author may not be used to endorse or promote products
16 *    derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30#include "includes.h"
31RCSID("$Id: compat.c,v 1.13 2000/05/08 17:42:24 markus Exp $");
32
33#include "ssh.h"
34#include "packet.h"
35#include "xmalloc.h"
36#include "compat.h"
37
38int compat13 = 0;
39int compat20 = 0;
40int datafellows = 0;
41
42void
43enable_compat20(void)
44{
45	verbose("Enabling compatibility mode for protocol 2.0");
46	compat20 = 1;
47}
48void
49enable_compat13(void)
50{
51	verbose("Enabling compatibility mode for protocol 1.3");
52	compat13 = 1;
53}
54/* datafellows bug compatibility */
55void
56compat_datafellows(const char *version)
57{
58	int i;
59	size_t len;
60	struct {
61		char	*version;
62		int	bugs;
63	} check[] = {
64		{"2.1.0",	SSH_BUG_SIGBLOB|SSH_BUG_HMAC},
65		{"2.0.1",	SSH_BUG_SIGBLOB|SSH_BUG_HMAC|SSH_BUG_PUBKEYAUTH|SSH_BUG_X11FWD},
66		{NULL,		0}
67	};
68	for (i = 0; check[i].version; i++) {
69		len = strlen(check[i].version);
70		if (strlen(version) >= len &&
71		   (strncmp(version, check[i].version, len) == 0)) {
72			verbose("datafellows: %.200s", version);
73			datafellows = check[i].bugs;
74			return;
75		}
76	}
77}
78
79#define	SEP	","
80int
81proto_spec(const char *spec)
82{
83	char *s = xstrdup(spec);
84	char *p;
85	int ret = SSH_PROTO_UNKNOWN;
86
87	for ((p = strtok(s, SEP)); p; (p = strtok(NULL, SEP))) {
88		switch(atoi(p)) {
89		case 1:
90			if (ret == SSH_PROTO_UNKNOWN)
91				ret |= SSH_PROTO_1_PREFERRED;
92			ret |= SSH_PROTO_1;
93			break;
94		case 2:
95			ret |= SSH_PROTO_2;
96			break;
97		default:
98			log("ignoring bad proto spec: '%s'.", p);
99			break;
100		}
101	}
102	xfree(s);
103	return ret;
104}
105