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
42 dispatch_fn *dispatch[DISPATCH_MAX];
43
44 void
dispatch_protocol_error(int type,u_int32_t seq,void * ctxt)45 dispatch_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 }
55 void
dispatch_protocol_ignore(int type,u_int32_t seq,void * ctxt)56 dispatch_protocol_ignore(int type, u_int32_t seq, void *ctxt)
57 {
58 logit("dispatch_protocol_ignore: type %d seq %u", type, seq);
59 }
60 void
dispatch_init(dispatch_fn * dflt)61 dispatch_init(dispatch_fn *dflt)
62 {
63 u_int i;
64 for (i = 0; i < DISPATCH_MAX; i++)
65 dispatch[i] = dflt;
66 }
67 void
dispatch_range(u_int from,u_int to,dispatch_fn * fn)68 dispatch_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 }
78 void
dispatch_set(int type,dispatch_fn * fn)79 dispatch_set(int type, dispatch_fn *fn)
80 {
81 dispatch[type] = fn;
82 }
83 void
dispatch_run(int mode,volatile sig_atomic_t * done,void * ctxt)84 dispatch_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