1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
/* packet-enc.c
*
* Copyright (c) 2003 Markus Friedl. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/capture_dissectors.h>
#include <epan/aftypes.h>
#include <wsutil/pint.h>
void proto_register_enc(void);
void proto_reg_handoff_enc(void);
/* The header in OpenBSD Encapsulating Interface files. */
struct enchdr {
guint32 af;
guint32 spi;
guint32 flags;
};
#define BSD_ENC_HDRLEN 12
#define BSD_ENC_M_CONF 0x0400 /* payload encrypted */
#define BSD_ENC_M_AUTH 0x0800 /* payload authenticated */
#define BSD_ENC_M_COMP 0x1000 /* payload compressed */
#define BSD_ENC_M_AUTH_AH 0x2000 /* header authenticated */
static dissector_table_t enc_dissector_table;
static dissector_handle_t data_handle;
/* header fields */
static int proto_enc = -1;
static int hf_enc_af = -1;
static int hf_enc_spi = -1;
static int hf_enc_flags = -1;
static int hf_enc_flags_payload_enc = -1;
static int hf_enc_flags_payload_auth = -1;
static int hf_enc_flags_payload_compress = -1;
static int hf_enc_flags_header_auth = -1;
static gint ett_enc = -1;
static gint ett_enc_flag = -1;
static gboolean
capture_enc(const guchar *pd, int offset _U_, int len, capture_packet_info_t *cpinfo, const union wtap_pseudo_header *pseudo_header _U_)
{
guint32 af;
if (!BYTES_ARE_IN_FRAME(0, len, BSD_ENC_HDRLEN))
return FALSE;
af = pntoh32(pd);
return try_capture_dissector("enc", af, pd, BSD_ENC_HDRLEN, len, cpinfo, pseudo_header);
}
static const value_string af_vals[] = {
{ BSD_AF_INET, "IPv4" },
{ BSD_AF_INET6_BSD, "IPv6" },
{ 0, NULL }
};
static int
dissect_enc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
struct enchdr ench;
tvbuff_t *next_tvb;
proto_tree *enc_tree;
proto_item *ti;
static const int *flags[] = {
&hf_enc_flags_payload_enc,
&hf_enc_flags_payload_auth,
&hf_enc_flags_payload_compress,
&hf_enc_flags_header_auth,
NULL
};
col_set_str(pinfo->cinfo, COL_PROTOCOL, "ENC");
ench.af = tvb_get_ntohl(tvb, 0);
ench.spi = tvb_get_ntohl(tvb, 4);
if (tree) {
ti = proto_tree_add_protocol_format(tree, proto_enc, tvb, 0,
BSD_ENC_HDRLEN,
"Enc %s, SPI 0x%8.8x",
val_to_str(ench.af, af_vals, "unknown (%u)"),
ench.spi);
enc_tree = proto_item_add_subtree(ti, ett_enc);
proto_tree_add_item(enc_tree, hf_enc_af, tvb, 0, 4, ENC_BIG_ENDIAN);
proto_tree_add_item(enc_tree, hf_enc_spi, tvb, 4, 4, ENC_BIG_ENDIAN);
proto_tree_add_bitmask(enc_tree, tvb, 8, hf_enc_flags, ett_enc_flag, flags, ENC_BIG_ENDIAN);
}
/* Set the tvbuff for the payload after the header */
next_tvb = tvb_new_subset_remaining(tvb, BSD_ENC_HDRLEN);
if (!dissector_try_uint(enc_dissector_table, ench.af, next_tvb, pinfo, tree))
call_dissector(data_handle, next_tvb, pinfo, tree);
return tvb_captured_length(tvb);
}
void
proto_register_enc(void)
{
static hf_register_info hf[] = {
{ &hf_enc_af,
{ "Address Family", "enc.af", FT_UINT32, BASE_DEC, VALS(af_vals), 0x0,
"Protocol (IPv4 vs IPv6)", HFILL }},
{ &hf_enc_spi,
{ "SPI", "enc.spi", FT_UINT32, BASE_HEX, NULL, 0x0,
"Security Parameter Index", HFILL }},
{ &hf_enc_flags,
{ "Flags", "enc.flags", FT_UINT32, BASE_HEX, NULL, 0x0,
"ENC flags", HFILL }},
{ &hf_enc_flags_payload_enc,
{ "Payload encrypted", "enc.flags.payload_enc", FT_BOOLEAN, 32, NULL, BSD_ENC_M_CONF,
NULL, HFILL }},
{ &hf_enc_flags_payload_auth,
{ "Payload encrypted", "enc.flags.payload_auth", FT_BOOLEAN, 32, NULL, BSD_ENC_M_AUTH,
NULL, HFILL }},
{ &hf_enc_flags_payload_compress,
{ "Payload encrypted", "enc.flags.payload_compress", FT_BOOLEAN, 32, NULL, BSD_ENC_M_COMP,
NULL, HFILL }},
{ &hf_enc_flags_header_auth,
{ "Payload encrypted", "enc.flags.header_auth", FT_BOOLEAN, 32, NULL, BSD_ENC_M_AUTH_AH,
NULL, HFILL }},
};
static gint *ett[] =
{
&ett_enc,
&ett_enc_flag
};
proto_enc = proto_register_protocol("OpenBSD Encapsulating device",
"ENC", "enc");
proto_register_field_array(proto_enc, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
enc_dissector_table = register_dissector_table("enc", "OpenBSD Encapsulating device", FT_UINT32, BASE_DEC, DISSECTOR_TABLE_NOT_ALLOW_DUPLICATE);
register_capture_dissector_table("enc", "ENC");
}
void
proto_reg_handoff_enc(void)
{
dissector_handle_t enc_handle;
data_handle = find_dissector("data");
enc_handle = create_dissector_handle(dissect_enc, proto_enc);
dissector_add_uint("wtap_encap", WTAP_ENCAP_ENC, enc_handle);
register_capture_dissector("wtap_encap", WTAP_ENCAP_ENC, capture_enc, proto_enc);
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local Variables:
* c-basic-offset: 2
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* ex: set shiftwidth=2 tabstop=8 expandtab:
* :indentSize=2:tabSize=8:noTabs=true:
*/
|
