1/* $OpenBSD: dispatch.c,v 1.22 2008/10/31 15:05:34 stevesk Exp $ */
2/*
3 * Copyright (c) 2000 Markus Friedl.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "includes.h"
27
28#include <sys/types.h>
29
30#include <signal.h>
31#include <stdarg.h>
32
33#include "ssh1.h"
34#include "ssh2.h"
35#include "log.h"
36#include "dispatch.h"
37#include "packet.h"
38#include "compat.h"
39
40#define DISPATCH_MAX	255
41
42dispatch_fn *dispatch[DISPATCH_MAX];
43
44void
45dispatch_protocol_error(int type, u_int32_t seq, void *ctxt)
46{
47	logit("dispatch_protocol_error: type %d seq %u", type, seq);
48	if (!compat20)
49		fatal("protocol error");
50	packet_start(SSH2_MSG_UNIMPLEMENTED);
51	packet_put_int(seq);
52	packet_send();
53	packet_write_wait();
54}
55void
56dispatch_protocol_ignore(int type, u_int32_t seq, void *ctxt)
57{
58	logit("dispatch_protocol_ignore: type %d seq %u", type, seq);
59}
60void
61dispatch_init(dispatch_fn *dflt)
62{
63	u_int i;
64	for (i = 0; i < DISPATCH_MAX; i++)
65		dispatch[i] = dflt;
66}
67void
68dispatch_range(u_int from, u_int to, dispatch_fn *fn)
69{
70	u_int i;
71
72	for (i = from; i <= to; i++) {
73		if (i >= DISPATCH_MAX)
74			break;
75		dispatch[i] = fn;
76	}
77}
78void
79dispatch_set(int type, dispatch_fn *fn)
80{
81	dispatch[type] = fn;
82}
83void
84dispatch_run(int mode, volatile sig_atomic_t *done, void *ctxt)
85{
86	for (;;) {
87		int type;
88		u_int32_t seqnr;
89
90		if (mode == DISPATCH_BLOCK) {
91			type = packet_read_seqnr(&seqnr);
92		} else {
93			type = packet_read_poll_seqnr(&seqnr);
94			if (type == SSH_MSG_NONE)
95				return;
96		}
97		if (type > 0 && type < DISPATCH_MAX && dispatch[type] != NULL)
98			(*dispatch[type])(type, seqnr, ctxt);
99		else
100			packet_disconnect("protocol error: rcvd type %d", type);
101		if (done != NULL && *done)
102			return;
103	}
104}
105