xref: /titanic_44/usr/src/cmd/ssh/libssh/common/dispatch.c (revision 40e5e17b3361b3eea56a9723071c406894a20b78)
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
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
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
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
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
76 dispatch_set(int type, dispatch_fn *fn)
77 {
78 	dispatch[type] = fn;
79 }
80 void
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