1 /*
2 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 */
21
22 /* \summary: ZigBee Encapsulation Protocol (ZEP) printer */
23
24 #ifdef HAVE_CONFIG_H
25 #include <config.h>
26 #endif
27
28 #include "netdissect-stdinc.h"
29
30 #define ND_LONGJMP_FROM_TCHECK
31 #include "netdissect.h"
32
33 #include "extract.h"
34
35 /* From wireshark packet-zep.c:
36 *
37 ***********************************************************************
38 *
39 * ZEP Packets must be received in the following format:
40 *
41 * |UDP Header| ZEP Header |IEEE 802.15.4 Packet|
42 * | 8 bytes | 16/32 bytes | <= 127 bytes |
43 *
44 ***********************************************************************
45 *
46 * ZEP v1 Header will have the following format:
47 * |Preamble|Version|Channel ID|Device ID|CRC/LQI Mode|LQI Val|Reserved|Length|
48 * |2 bytes |1 byte | 1 byte | 2 bytes | 1 byte |1 byte |7 bytes |1 byte|
49 *
50 * ZEP v2 Header will have the following format (if type=1/Data):
51 * |Prmbl|Ver |Type |ChnlID|DevID|C/L Mode|LQI|NTP TS|Seq#|Res |Len|
52 * | 2 | 1 | 1 | 1 | 2 | 1 | 1 | 8 | 4 | 10 | 1 |
53 *
54 * ZEP v2 Header will have the following format (if type=2/Ack):
55 * |Preamble|Version| Type |Sequence#|
56 * |2 bytes |1 byte |1 byte| 4 bytes |
57 *------------------------------------------------------------
58 */
59
60 #define JAN_1970 2208988800U
61
62 /* Print timestamp */
zep_print_ts(netdissect_options * ndo,const u_char * p)63 static void zep_print_ts(netdissect_options *ndo, const u_char *p)
64 {
65 int32_t i;
66 uint32_t uf;
67 uint32_t f;
68 float ff;
69
70 i = GET_BE_U_4(p);
71 uf = GET_BE_U_4(p + 4);
72 ff = (float) uf;
73 if (ff < 0.0) /* some compilers are buggy */
74 ff += FMAXINT;
75 ff = (float) (ff / FMAXINT); /* shift radix point by 32 bits */
76 f = (uint32_t) (ff * 1000000000.0); /* treat fraction as parts per
77 billion */
78 ND_PRINT("%u.%09d", i, f);
79
80 #ifdef HAVE_STRFTIME
81 /*
82 * print the time in human-readable format.
83 */
84 if (i) {
85 time_t seconds = i - JAN_1970;
86 struct tm *tm;
87 char time_buf[128];
88
89 tm = localtime(&seconds);
90 strftime(time_buf, sizeof (time_buf), "%Y/%m/%d %H:%M:%S", tm);
91 ND_PRINT(" (%s)", time_buf);
92 }
93 #endif
94 }
95
96 /*
97 * Main function to print packets.
98 */
99
100 void
zep_print(netdissect_options * ndo,const u_char * bp,u_int len)101 zep_print(netdissect_options *ndo,
102 const u_char *bp, u_int len)
103 {
104 uint8_t version, inner_len;
105 uint32_t seq_no;
106
107 ndo->ndo_protocol = "zep";
108
109 nd_print_protocol_caps(ndo);
110
111 /* Preamble Code (must be "EX") */
112 if (GET_U_1(bp) != 'E' || GET_U_1(bp + 1) != 'X') {
113 ND_PRINT(" [Preamble Code: ");
114 fn_print_char(ndo, GET_U_1(bp));
115 fn_print_char(ndo, GET_U_1(bp + 1));
116 ND_PRINT("]");
117 nd_print_invalid(ndo);
118 return;
119 }
120
121 version = GET_U_1(bp + 2);
122 ND_PRINT("v%u ", version);
123
124 if (version == 1) {
125 /* ZEP v1 packet. */
126 ND_LCHECK_U(len, 16);
127 ND_PRINT("Channel ID %u, Device ID 0x%04x, ",
128 GET_U_1(bp + 3), GET_BE_U_2(bp + 4));
129 if (GET_U_1(bp + 6))
130 ND_PRINT("CRC, ");
131 else
132 ND_PRINT("LQI %u, ", GET_U_1(bp + 7));
133 inner_len = GET_U_1(bp + 15);
134 ND_PRINT("inner len = %u", inner_len);
135
136 bp += 16;
137 len -= 16;
138 } else {
139 /* ZEP v2 packet. */
140 if (GET_U_1(bp + 3) == 2) {
141 /* ZEP v2 ack. */
142 ND_LCHECK_U(len, 8);
143 seq_no = GET_BE_U_4(bp + 4);
144 ND_PRINT("ACK, seq# = %u", seq_no);
145 inner_len = 0;
146 bp += 8;
147 len -= 8;
148 } else {
149 /* ZEP v2 data, or some other. */
150 ND_LCHECK_U(len, 32);
151 ND_PRINT("Type %u, Channel ID %u, Device ID 0x%04x, ",
152 GET_U_1(bp + 3), GET_U_1(bp + 4),
153 GET_BE_U_2(bp + 5));
154 if (GET_U_1(bp + 7))
155 ND_PRINT("CRC, ");
156 else
157 ND_PRINT("LQI %u, ", GET_U_1(bp + 8));
158
159 zep_print_ts(ndo, bp + 9);
160 seq_no = GET_BE_U_4(bp + 17);
161 inner_len = GET_U_1(bp + 31);
162 ND_PRINT(", seq# = %u, inner len = %u",
163 seq_no, inner_len);
164 bp += 32;
165 len -= 32;
166 }
167 }
168
169 if (inner_len != 0) {
170 /* Call 802.15.4 dissector. */
171 ND_PRINT("\n\t");
172 if (ieee802_15_4_print(ndo, bp, inner_len)) {
173 ND_TCHECK_LEN(bp, len);
174 bp += len;
175 len = 0;
176 }
177 }
178
179 if (!ndo->ndo_suppress_default_print)
180 ND_DEFAULTPRINT(bp, len);
181 return;
182 invalid:
183 nd_print_invalid(ndo);
184 }
185