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djm@openbsd.orgad60b112019-01-19 21:33:13 +00001/* $OpenBSD: dispatch.c,v 1.32 2019/01/19 21:33:13 djm Exp $ */
Damien Miller4af51302000-04-16 11:18:38 +10002/*
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.
Damien Miller4af51302000-04-16 11:18:38 +100013 *
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 */
Damien Millerd7834352006-08-05 12:39:39 +100025
Damien Miller4af51302000-04-16 11:18:38 +100026#include "includes.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000027
Damien Millerd7834352006-08-05 12:39:39 +100028#include <sys/types.h>
29
Damien Millerd8337c52006-07-24 14:14:19 +100030#include <signal.h>
Damien Millerd7834352006-08-05 12:39:39 +100031#include <stdarg.h>
Damien Millerd8337c52006-07-24 14:14:19 +100032
Ben Lindstromef1cf5d2001-01-29 07:55:07 +000033#include "ssh2.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000034#include "log.h"
Damien Miller4af51302000-04-16 11:18:38 +100035#include "dispatch.h"
36#include "packet.h"
Ben Lindstromef1cf5d2001-01-29 07:55:07 +000037#include "compat.h"
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +000038#include "ssherr.h"
Damien Miller4af51302000-04-16 11:18:38 +100039
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +000040int
markus@openbsd.org2ae666a2017-05-30 14:23:52 +000041dispatch_protocol_error(int type, u_int32_t seq, struct ssh *ssh)
Damien Miller4af51302000-04-16 11:18:38 +100042{
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +000043 int r;
44
Damien Miller996acd22003-04-09 20:59:48 +100045 logit("dispatch_protocol_error: type %d seq %u", type, seq);
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +000046 if ((r = sshpkt_start(ssh, SSH2_MSG_UNIMPLEMENTED)) != 0 ||
47 (r = sshpkt_put_u32(ssh, seq)) != 0 ||
djm@openbsd.org4509b5d2015-01-30 01:13:33 +000048 (r = sshpkt_send(ssh)) != 0 ||
49 (r = ssh_packet_write_wait(ssh)) != 0)
djm@openbsd.orgad60b112019-01-19 21:33:13 +000050 sshpkt_fatal(ssh, r, "%s", __func__);
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +000051 return 0;
Damien Miller7d053392002-01-22 23:24:13 +110052}
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +000053
54int
markus@openbsd.org2ae666a2017-05-30 14:23:52 +000055dispatch_protocol_ignore(int type, u_int32_t seq, struct ssh *ssh)
Damien Miller7d053392002-01-22 23:24:13 +110056{
Damien Miller996acd22003-04-09 20:59:48 +100057 logit("dispatch_protocol_ignore: type %d seq %u", type, seq);
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +000058 return 0;
Damien Miller4af51302000-04-16 11:18:38 +100059}
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +000060
Damien Miller4af51302000-04-16 11:18:38 +100061void
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +000062ssh_dispatch_init(struct ssh *ssh, dispatch_fn *dflt)
Damien Miller4af51302000-04-16 11:18:38 +100063{
Damien Miller7d053392002-01-22 23:24:13 +110064 u_int i;
Damien Miller4af51302000-04-16 11:18:38 +100065 for (i = 0; i < DISPATCH_MAX; i++)
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +000066 ssh->dispatch[i] = dflt;
Damien Miller4af51302000-04-16 11:18:38 +100067}
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +000068
Damien Miller4af51302000-04-16 11:18:38 +100069void
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +000070ssh_dispatch_range(struct ssh *ssh, u_int from, u_int to, dispatch_fn *fn)
Damien Miller7d053392002-01-22 23:24:13 +110071{
72 u_int i;
73
74 for (i = from; i <= to; i++) {
75 if (i >= DISPATCH_MAX)
76 break;
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +000077 ssh->dispatch[i] = fn;
Damien Miller7d053392002-01-22 23:24:13 +110078 }
79}
Damien Miller4af51302000-04-16 11:18:38 +100080
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +000081void
82ssh_dispatch_set(struct ssh *ssh, int type, dispatch_fn *fn)
83{
84 ssh->dispatch[type] = fn;
85}
86
87int
markus@openbsd.org92e9fe62017-05-31 07:00:13 +000088ssh_dispatch_run(struct ssh *ssh, int mode, volatile sig_atomic_t *done)
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +000089{
90 int r;
91 u_char type;
92 u_int32_t seqnr;
93
94 for (;;) {
Damien Miller4af51302000-04-16 11:18:38 +100095 if (mode == DISPATCH_BLOCK) {
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +000096 r = ssh_packet_read_seqnr(ssh, &type, &seqnr);
97 if (r != 0)
98 return r;
Damien Miller4af51302000-04-16 11:18:38 +100099 } else {
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +0000100 r = ssh_packet_read_poll_seqnr(ssh, &type, &seqnr);
101 if (r != 0)
102 return r;
Damien Miller4af51302000-04-16 11:18:38 +1000103 if (type == SSH_MSG_NONE)
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +0000104 return 0;
Damien Miller4af51302000-04-16 11:18:38 +1000105 }
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +0000106 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--;
111 continue;
112 }
markus@openbsd.org92e9fe62017-05-31 07:00:13 +0000113 r = (*ssh->dispatch[type])(type, seqnr, ssh);
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +0000114 if (r != 0)
115 return r;
116 } else {
117 r = sshpkt_disconnect(ssh,
118 "protocol error: rcvd type %d", type);
119 if (r != 0)
120 return r;
121 return SSH_ERR_DISCONNECTED;
122 }
Damien Miller4af51302000-04-16 11:18:38 +1000123 if (done != NULL && *done)
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +0000124 return 0;
Damien Miller4af51302000-04-16 11:18:38 +1000125 }
126}
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +0000127
128void
markus@openbsd.org92e9fe62017-05-31 07:00:13 +0000129ssh_dispatch_run_fatal(struct ssh *ssh, int mode, volatile sig_atomic_t *done)
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +0000130{
131 int r;
132
markus@openbsd.org92e9fe62017-05-31 07:00:13 +0000133 if ((r = ssh_dispatch_run(ssh, mode, done)) != 0)
djm@openbsd.orgad60b112019-01-19 21:33:13 +0000134 sshpkt_fatal(ssh, r, "%s", __func__);
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +0000135}