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
|
/*
* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior
* written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
/* \summary: ZigBee Encapsulation Protocol (ZEP) printer */
#include <config.h>
#include "netdissect-stdinc.h"
#define ND_LONGJMP_FROM_TCHECK
#include "netdissect.h"
#include "extract.h"
/* From wireshark packet-zep.c:
*
***********************************************************************
*
* ZEP Packets must be received in the following format:
*
* |UDP Header| ZEP Header |IEEE 802.15.4 Packet|
* | 8 bytes | 16/32 bytes | <= 127 bytes |
*
***********************************************************************
*
* ZEP v1 Header will have the following format:
* |Preamble|Version|Channel ID|Device ID|CRC/LQI Mode|LQI Val|Reserved|Length|
* |2 bytes |1 byte | 1 byte | 2 bytes | 1 byte |1 byte |7 bytes |1 byte|
*
* ZEP v2 Header will have the following format (if type=1/Data):
* |Prmbl|Ver |Type |ChnlID|DevID|C/L Mode|LQI|NTP TS|Seq#|Res |Len|
* | 2 | 1 | 1 | 1 | 2 | 1 | 1 | 8 | 4 | 10 | 1 |
*
* ZEP v2 Header will have the following format (if type=2/Ack):
* |Preamble|Version| Type |Sequence#|
* |2 bytes |1 byte |1 byte| 4 bytes |
*------------------------------------------------------------
*/
#define JAN_1970 2208988800U
/* Print timestamp */
static void zep_print_ts(netdissect_options *ndo, const u_char *p)
{
int32_t i;
uint32_t uf;
uint32_t f;
float ff;
i = GET_BE_U_4(p);
uf = GET_BE_U_4(p + 4);
ff = (float) uf;
if (ff < 0.0) /* some compilers are buggy */
ff += FMAXINT;
ff = (float) (ff / FMAXINT); /* shift radix point by 32 bits */
f = (uint32_t) (ff * 1000000000.0); /* treat fraction as parts per
billion */
ND_PRINT("%u.%09d", i, f);
/*
* print the time in human-readable format.
*/
if (i) {
time_t seconds = i - JAN_1970;
char time_buf[128];
ND_PRINT(" (%s)",
nd_format_time(time_buf, sizeof (time_buf), "%Y-%m-%d %H:%M:%S",
localtime(&seconds)));
}
}
/*
* Main function to print packets.
*/
void
zep_print(netdissect_options *ndo,
const u_char *bp, u_int len)
{
uint8_t version, inner_len;
uint32_t seq_no;
ndo->ndo_protocol = "zep";
nd_print_protocol_caps(ndo);
/* Preamble Code (must be "EX") */
if (GET_U_1(bp) != 'E' || GET_U_1(bp + 1) != 'X') {
ND_PRINT(" [Preamble Code: ");
fn_print_char(ndo, GET_U_1(bp));
fn_print_char(ndo, GET_U_1(bp + 1));
ND_PRINT("]");
nd_print_invalid(ndo);
return;
}
version = GET_U_1(bp + 2);
ND_PRINT("v%u ", version);
if (version == 1) {
/* ZEP v1 packet. */
ND_ICHECK_U(len, <, 16);
ND_PRINT("Channel ID %u, Device ID 0x%04x, ",
GET_U_1(bp + 3), GET_BE_U_2(bp + 4));
if (GET_U_1(bp + 6))
ND_PRINT("CRC, ");
else
ND_PRINT("LQI %u, ", GET_U_1(bp + 7));
inner_len = GET_U_1(bp + 15);
ND_PRINT("inner len = %u", inner_len);
bp += 16;
len -= 16;
} else {
/* ZEP v2 packet. */
if (GET_U_1(bp + 3) == 2) {
/* ZEP v2 ack. */
ND_ICHECK_U(len, <, 8);
seq_no = GET_BE_U_4(bp + 4);
ND_PRINT("ACK, seq# = %u", seq_no);
inner_len = 0;
bp += 8;
len -= 8;
} else {
/* ZEP v2 data, or some other. */
ND_ICHECK_U(len, <, 32);
ND_PRINT("Type %u, Channel ID %u, Device ID 0x%04x, ",
GET_U_1(bp + 3), GET_U_1(bp + 4),
GET_BE_U_2(bp + 5));
if (GET_U_1(bp + 7))
ND_PRINT("CRC, ");
else
ND_PRINT("LQI %u, ", GET_U_1(bp + 8));
zep_print_ts(ndo, bp + 9);
seq_no = GET_BE_U_4(bp + 17);
inner_len = GET_U_1(bp + 31);
ND_PRINT(", seq# = %u, inner len = %u",
seq_no, inner_len);
bp += 32;
len -= 32;
}
}
if (inner_len != 0) {
/* Call 802.15.4 dissector. */
ND_PRINT("\n\t");
if (ieee802_15_4_print(ndo, bp, inner_len)) {
ND_TCHECK_LEN(bp, len);
bp += len;
len = 0;
}
}
if (!ndo->ndo_suppress_default_print)
ND_DEFAULTPRINT(bp, len);
return;
invalid:
nd_print_invalid(ndo);
}
|
