1 |
|
|
/* $OpenBSD: dispatch.c,v 1.31 2017/05/31 07:00:13 markus 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 <sys/types.h> |
27 |
|
|
|
28 |
|
|
#include <signal.h> |
29 |
|
|
#include <stdarg.h> |
30 |
|
|
|
31 |
|
|
#include "ssh2.h" |
32 |
|
|
#include "log.h" |
33 |
|
|
#include "dispatch.h" |
34 |
|
|
#include "packet.h" |
35 |
|
|
#include "compat.h" |
36 |
|
|
#include "ssherr.h" |
37 |
|
|
|
38 |
|
|
int |
39 |
|
|
dispatch_protocol_error(int type, u_int32_t seq, struct ssh *ssh) |
40 |
|
|
{ |
41 |
|
|
int r; |
42 |
|
|
|
43 |
|
|
logit("dispatch_protocol_error: type %d seq %u", type, seq); |
44 |
|
|
if ((r = sshpkt_start(ssh, SSH2_MSG_UNIMPLEMENTED)) != 0 || |
45 |
|
|
(r = sshpkt_put_u32(ssh, seq)) != 0 || |
46 |
|
|
(r = sshpkt_send(ssh)) != 0 || |
47 |
|
|
(r = ssh_packet_write_wait(ssh)) != 0) |
48 |
|
|
sshpkt_fatal(ssh, __func__, r); |
49 |
|
|
return 0; |
50 |
|
|
} |
51 |
|
|
|
52 |
|
|
int |
53 |
|
|
dispatch_protocol_ignore(int type, u_int32_t seq, struct ssh *ssh) |
54 |
|
|
{ |
55 |
|
|
logit("dispatch_protocol_ignore: type %d seq %u", type, seq); |
56 |
|
|
return 0; |
57 |
|
|
} |
58 |
|
|
|
59 |
|
|
void |
60 |
|
|
ssh_dispatch_init(struct ssh *ssh, dispatch_fn *dflt) |
61 |
|
|
{ |
62 |
|
|
u_int i; |
63 |
|
|
for (i = 0; i < DISPATCH_MAX; i++) |
64 |
|
|
ssh->dispatch[i] = dflt; |
65 |
|
|
} |
66 |
|
|
|
67 |
|
|
void |
68 |
|
|
ssh_dispatch_range(struct ssh *ssh, 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 |
|
|
ssh->dispatch[i] = fn; |
76 |
|
|
} |
77 |
|
|
} |
78 |
|
|
|
79 |
|
|
void |
80 |
|
|
ssh_dispatch_set(struct ssh *ssh, int type, dispatch_fn *fn) |
81 |
|
|
{ |
82 |
|
|
ssh->dispatch[type] = fn; |
83 |
|
|
} |
84 |
|
|
|
85 |
|
|
int |
86 |
|
|
ssh_dispatch_run(struct ssh *ssh, int mode, volatile sig_atomic_t *done) |
87 |
|
|
{ |
88 |
|
|
int r; |
89 |
|
|
u_char type; |
90 |
|
|
u_int32_t seqnr; |
91 |
|
|
|
92 |
|
|
for (;;) { |
93 |
|
|
if (mode == DISPATCH_BLOCK) { |
94 |
|
|
r = ssh_packet_read_seqnr(ssh, &type, &seqnr); |
95 |
|
|
if (r != 0) |
96 |
|
|
return r; |
97 |
|
|
} else { |
98 |
|
|
r = ssh_packet_read_poll_seqnr(ssh, &type, &seqnr); |
99 |
|
|
if (r != 0) |
100 |
|
|
return r; |
101 |
|
|
if (type == SSH_MSG_NONE) |
102 |
|
|
return 0; |
103 |
|
|
} |
104 |
|
|
if (type > 0 && type < DISPATCH_MAX && |
105 |
|
|
ssh->dispatch[type] != NULL) { |
106 |
|
|
if (ssh->dispatch_skip_packets) { |
107 |
|
|
debug2("skipped packet (type %u)", type); |
108 |
|
|
ssh->dispatch_skip_packets--; |
109 |
|
|
continue; |
110 |
|
|
} |
111 |
|
|
r = (*ssh->dispatch[type])(type, seqnr, ssh); |
112 |
|
|
if (r != 0) |
113 |
|
|
return r; |
114 |
|
|
} else { |
115 |
|
|
r = sshpkt_disconnect(ssh, |
116 |
|
|
"protocol error: rcvd type %d", type); |
117 |
|
|
if (r != 0) |
118 |
|
|
return r; |
119 |
|
|
return SSH_ERR_DISCONNECTED; |
120 |
|
|
} |
121 |
|
|
if (done != NULL && *done) |
122 |
|
|
return 0; |
123 |
|
|
} |
124 |
|
|
} |
125 |
|
|
|
126 |
|
|
void |
127 |
|
|
ssh_dispatch_run_fatal(struct ssh *ssh, int mode, volatile sig_atomic_t *done) |
128 |
|
|
{ |
129 |
|
|
int r; |
130 |
|
|
|
131 |
|
|
if ((r = ssh_dispatch_run(ssh, mode, done)) != 0) |
132 |
|
|
sshpkt_fatal(ssh, __func__, r); |
133 |
|
|
} |