summaryrefslogtreecommitdiffstats
path: root/dispatch.c
blob: afe618221a6ab27c9d66bd1ce12fb599704226f9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
/* $OpenBSD: dispatch.c,v 1.26 2015/02/12 20:34:19 dtucker Exp $ */
/*
 * Copyright (c) 2000 Markus Friedl.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "includes.h"

#include <sys/types.h>

#include <signal.h>
#include <stdarg.h>

#include "ssh1.h"
#include "ssh2.h"
#include "log.h"
#include "dispatch.h"
#include "packet.h"
#include "compat.h"
#include "ssherr.h"

int
dispatch_protocol_error(int type, u_int32_t seq, void *ctx)
{
	struct ssh *ssh = active_state; /* XXX */
	int r;

	logit("dispatch_protocol_error: type %d seq %u", type, seq);
	if (!compat20)
		fatal("protocol error");
	if ((r = sshpkt_start(ssh, SSH2_MSG_UNIMPLEMENTED)) != 0 ||
	    (r = sshpkt_put_u32(ssh, seq)) != 0 ||
	    (r = sshpkt_send(ssh)) != 0 ||
	    (r = ssh_packet_write_wait(ssh)) != 0)
		sshpkt_fatal(ssh, __func__, r);
	return 0;
}

int
dispatch_protocol_ignore(int type, u_int32_t seq, void *ssh)
{
	logit("dispatch_protocol_ignore: type %d seq %u", type, seq);
	return 0;
}

void
ssh_dispatch_init(struct ssh *ssh, dispatch_fn *dflt)
{
	u_int i;
	for (i = 0; i < DISPATCH_MAX; i++)
		ssh->dispatch[i] = dflt;
}

void
ssh_dispatch_range(struct ssh *ssh, u_int from, u_int to, dispatch_fn *fn)
{
	u_int i;

	for (i = from; i <= to; i++) {
		if (i >= DISPATCH_MAX)
			break;
		ssh->dispatch[i] = fn;
	}
}

void
ssh_dispatch_set(struct ssh *ssh, int type, dispatch_fn *fn)
{
	ssh->dispatch[type] = fn;
}

int
ssh_dispatch_run(struct ssh *ssh, int mode, volatile sig_atomic_t *done,
    void *ctxt)
{
	int r;
	u_char type;
	u_int32_t seqnr;

	for (;;) {
		if (mode == DISPATCH_BLOCK) {
			r = ssh_packet_read_seqnr(ssh, &type, &seqnr);
			if (r != 0)
				return r;
		} else {
			r = ssh_packet_read_poll_seqnr(ssh, &type, &seqnr);
			if (r != 0)
				return r;
			if (type == SSH_MSG_NONE)
				return 0;
		}
		if (type > 0 && type < DISPATCH_MAX &&
		    ssh->dispatch[type] != NULL) {
			if (ssh->dispatch_skip_packets) {
				debug2("skipped packet (type %u)", type);
				ssh->dispatch_skip_packets--;
				continue;
			}
			/* XXX 'ssh' will replace 'ctxt' later */
			r = (*ssh->dispatch[type])(type, seqnr, ctxt);
			if (r != 0)
				return r;
		} else {
			r = sshpkt_disconnect(ssh,
			    "protocol error: rcvd type %d", type);
			if (r != 0)
				return r;
			return SSH_ERR_DISCONNECTED;
		}
		if (done != NULL && *done)
			return 0;
	}
}

void
ssh_dispatch_run_fatal(struct ssh *ssh, int mode, volatile sig_atomic_t *done,
    void *ctxt)
{
	int r;

	if ((r = ssh_dispatch_run(ssh, mode, done, ctxt)) != 0) {
		switch (r) {
		case SSH_ERR_CONN_CLOSED:
			logit("Connection closed by %.200s",
			    ssh_remote_ipaddr(ssh));
			cleanup_exit(255);
		case SSH_ERR_CONN_TIMEOUT:
			logit("Connection to %.200s timed out while "
			    "waiting to read", ssh_remote_ipaddr(ssh));
			cleanup_exit(255);
		case SSH_ERR_DISCONNECTED:
			logit("Disconnected from %.200s",
			    ssh_remote_ipaddr(ssh));
			cleanup_exit(255);
		default:
			fatal("%s: %s", __func__, ssh_err(r));
		}
	}
}