1 /* $OpenBSD: dispatch.c,v 1.31 2017/05/31 07:00:13 markus Exp $ */
3 * Copyright (c) 2000 Markus Friedl. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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.
28 #include <sys/types.h>
41 dispatch_protocol_error(int type, u_int32_t seq, struct ssh *ssh)
45 logit("dispatch_protocol_error: type %d seq %u", type, seq);
46 if ((r = sshpkt_start(ssh, SSH2_MSG_UNIMPLEMENTED)) != 0 ||
47 (r = sshpkt_put_u32(ssh, seq)) != 0 ||
48 (r = sshpkt_send(ssh)) != 0 ||
49 (r = ssh_packet_write_wait(ssh)) != 0)
50 sshpkt_fatal(ssh, __func__, r);
55 dispatch_protocol_ignore(int type, u_int32_t seq, struct ssh *ssh)
57 logit("dispatch_protocol_ignore: type %d seq %u", type, seq);
62 ssh_dispatch_init(struct ssh *ssh, dispatch_fn *dflt)
65 for (i = 0; i < DISPATCH_MAX; i++)
66 ssh->dispatch[i] = dflt;
70 ssh_dispatch_range(struct ssh *ssh, u_int from, u_int to, dispatch_fn *fn)
74 for (i = from; i <= to; i++) {
75 if (i >= DISPATCH_MAX)
77 ssh->dispatch[i] = fn;
82 ssh_dispatch_set(struct ssh *ssh, int type, dispatch_fn *fn)
84 ssh->dispatch[type] = fn;
88 ssh_dispatch_run(struct ssh *ssh, int mode, volatile sig_atomic_t *done)
95 if (mode == DISPATCH_BLOCK) {
96 r = ssh_packet_read_seqnr(ssh, &type, &seqnr);
100 r = ssh_packet_read_poll_seqnr(ssh, &type, &seqnr);
103 if (type == SSH_MSG_NONE)
106 if (type > 0 && type < DISPATCH_MAX &&
107 ssh->dispatch[type] != NULL) {
108 if (ssh->dispatch_skip_packets) {
109 debug2("skipped packet (type %u)", type);
110 ssh->dispatch_skip_packets--;
113 r = (*ssh->dispatch[type])(type, seqnr, ssh);
117 r = sshpkt_disconnect(ssh,
118 "protocol error: rcvd type %d", type);
121 return SSH_ERR_DISCONNECTED;
123 if (done != NULL && *done)
129 ssh_dispatch_run_fatal(struct ssh *ssh, int mode, volatile sig_atomic_t *done)
133 if ((r = ssh_dispatch_run(ssh, mode, done)) != 0)
134 sshpkt_fatal(ssh, __func__, r);