1 /*
2 * Copyright (c) 2000 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 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 */
24 #include "includes.h"
25 RCSID("$OpenBSD: dispatch.c,v 1.15 2002/01/11 13:39:36 markus Exp $");
26
27 #pragma ident "%Z%%M% %I% %E% SMI"
28
29 #include "ssh1.h"
30 #include "ssh2.h"
31 #include "log.h"
32 #include "dispatch.h"
33 #include "packet.h"
34 #include "compat.h"
35
36 #define DISPATCH_MIN 0
37 #define DISPATCH_MAX 255
38
39 dispatch_fn *dispatch[DISPATCH_MAX];
40
41 void
dispatch_protocol_error(int type,u_int32_t seq,void * ctxt)42 dispatch_protocol_error(int type, u_int32_t seq, void *ctxt)
43 {
44 log("dispatch_protocol_error: type %d seq %u", type, seq);
45 if (!compat20)
46 fatal("protocol error");
47 packet_start(SSH2_MSG_UNIMPLEMENTED);
48 packet_put_int(seq);
49 packet_send();
50 packet_write_wait();
51 }
52 void
dispatch_protocol_ignore(int type,u_int32_t seq,void * ctxt)53 dispatch_protocol_ignore(int type, u_int32_t seq, void *ctxt)
54 {
55 log("dispatch_protocol_ignore: type %d seq %u", type, seq);
56 }
57 void
dispatch_init(dispatch_fn * dflt)58 dispatch_init(dispatch_fn *dflt)
59 {
60 u_int i;
61 for (i = 0; i < DISPATCH_MAX; i++)
62 dispatch[i] = dflt;
63 }
64 void
dispatch_range(u_int from,u_int to,dispatch_fn * fn)65 dispatch_range(u_int from, u_int to, dispatch_fn *fn)
66 {
67 u_int i;
68
69 for (i = from; i <= to; i++) {
70 if (i >= DISPATCH_MAX)
71 break;
72 dispatch[i] = fn;
73 }
74 }
75 void
dispatch_set(int type,dispatch_fn * fn)76 dispatch_set(int type, dispatch_fn *fn)
77 {
78 dispatch[type] = fn;
79 }
80 void
dispatch_run(int mode,int * done,void * ctxt)81 dispatch_run(int mode, int *done, void *ctxt)
82 {
83 for (;;) {
84 int type;
85 u_int32_t seqnr;
86
87 if (mode == DISPATCH_BLOCK) {
88 type = packet_read_seqnr(&seqnr);
89 } else {
90 type = packet_read_poll_seqnr(&seqnr);
91 if (type == SSH_MSG_NONE)
92 return;
93 }
94 if (type > 0 && type < DISPATCH_MAX && dispatch[type] != NULL)
95 (*dispatch[type])(type, seqnr, ctxt);
96 else
97 packet_disconnect("protocol error: rcvd type %d", type);
98 if (done != NULL && *done)
99 return;
100 }
101 }
102