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 #include <config.h> 25 26 #include "netdissect-stdinc.h" 27 28 #define ND_LONGJMP_FROM_TCHECK 29 #include "netdissect.h" 30 31 #include "extract.h" 32 33 /* From wireshark packet-zep.c: 34 * 35 *********************************************************************** 36 * 37 * ZEP Packets must be received in the following format: 38 * 39 * |UDP Header| ZEP Header |IEEE 802.15.4 Packet| 40 * | 8 bytes | 16/32 bytes | <= 127 bytes | 41 * 42 *********************************************************************** 43 * 44 * ZEP v1 Header will have the following format: 45 * |Preamble|Version|Channel ID|Device ID|CRC/LQI Mode|LQI Val|Reserved|Length| 46 * |2 bytes |1 byte | 1 byte | 2 bytes | 1 byte |1 byte |7 bytes |1 byte| 47 * 48 * ZEP v2 Header will have the following format (if type=1/Data): 49 * |Prmbl|Ver |Type |ChnlID|DevID|C/L Mode|LQI|NTP TS|Seq#|Res |Len| 50 * | 2 | 1 | 1 | 1 | 2 | 1 | 1 | 8 | 4 | 10 | 1 | 51 * 52 * ZEP v2 Header will have the following format (if type=2/Ack): 53 * |Preamble|Version| Type |Sequence#| 54 * |2 bytes |1 byte |1 byte| 4 bytes | 55 *------------------------------------------------------------ 56 */ 57 58 #define JAN_1970 2208988800U 59 60 /* Print timestamp */ 61 static void zep_print_ts(netdissect_options *ndo, const u_char *p) 62 { 63 int32_t i; 64 uint32_t uf; 65 uint32_t f; 66 float ff; 67 68 i = GET_BE_U_4(p); 69 uf = GET_BE_U_4(p + 4); 70 ff = (float) uf; 71 if (ff < 0.0) /* some compilers are buggy */ 72 ff += FMAXINT; 73 ff = (float) (ff / FMAXINT); /* shift radix point by 32 bits */ 74 f = (uint32_t) (ff * 1000000000.0); /* treat fraction as parts per 75 billion */ 76 ND_PRINT("%u.%09d", i, f); 77 78 /* 79 * print the time in human-readable format. 80 */ 81 if (i) { 82 time_t seconds = i - JAN_1970; 83 char time_buf[128]; 84 85 ND_PRINT(" (%s)", 86 nd_format_time(time_buf, sizeof (time_buf), "%Y-%m-%d %H:%M:%S", 87 localtime(&seconds))); 88 } 89 } 90 91 /* 92 * Main function to print packets. 93 */ 94 95 void 96 zep_print(netdissect_options *ndo, 97 const u_char *bp, u_int len) 98 { 99 uint8_t version, inner_len; 100 uint32_t seq_no; 101 102 ndo->ndo_protocol = "zep"; 103 104 nd_print_protocol_caps(ndo); 105 106 /* Preamble Code (must be "EX") */ 107 if (GET_U_1(bp) != 'E' || GET_U_1(bp + 1) != 'X') { 108 ND_PRINT(" [Preamble Code: "); 109 fn_print_char(ndo, GET_U_1(bp)); 110 fn_print_char(ndo, GET_U_1(bp + 1)); 111 ND_PRINT("]"); 112 nd_print_invalid(ndo); 113 return; 114 } 115 116 version = GET_U_1(bp + 2); 117 ND_PRINT("v%u ", version); 118 119 if (version == 1) { 120 /* ZEP v1 packet. */ 121 ND_ICHECK_U(len, <, 16); 122 ND_PRINT("Channel ID %u, Device ID 0x%04x, ", 123 GET_U_1(bp + 3), GET_BE_U_2(bp + 4)); 124 if (GET_U_1(bp + 6)) 125 ND_PRINT("CRC, "); 126 else 127 ND_PRINT("LQI %u, ", GET_U_1(bp + 7)); 128 inner_len = GET_U_1(bp + 15); 129 ND_PRINT("inner len = %u", inner_len); 130 131 bp += 16; 132 len -= 16; 133 } else { 134 /* ZEP v2 packet. */ 135 if (GET_U_1(bp + 3) == 2) { 136 /* ZEP v2 ack. */ 137 ND_ICHECK_U(len, <, 8); 138 seq_no = GET_BE_U_4(bp + 4); 139 ND_PRINT("ACK, seq# = %u", seq_no); 140 inner_len = 0; 141 bp += 8; 142 len -= 8; 143 } else { 144 /* ZEP v2 data, or some other. */ 145 ND_ICHECK_U(len, <, 32); 146 ND_PRINT("Type %u, Channel ID %u, Device ID 0x%04x, ", 147 GET_U_1(bp + 3), GET_U_1(bp + 4), 148 GET_BE_U_2(bp + 5)); 149 if (GET_U_1(bp + 7)) 150 ND_PRINT("CRC, "); 151 else 152 ND_PRINT("LQI %u, ", GET_U_1(bp + 8)); 153 154 zep_print_ts(ndo, bp + 9); 155 seq_no = GET_BE_U_4(bp + 17); 156 inner_len = GET_U_1(bp + 31); 157 ND_PRINT(", seq# = %u, inner len = %u", 158 seq_no, inner_len); 159 bp += 32; 160 len -= 32; 161 } 162 } 163 164 if (inner_len != 0) { 165 /* Call 802.15.4 dissector. */ 166 ND_PRINT("\n\t"); 167 if (ieee802_15_4_print(ndo, bp, inner_len)) { 168 ND_TCHECK_LEN(bp, len); 169 bp += len; 170 len = 0; 171 } 172 } 173 174 if (!ndo->ndo_suppress_default_print) 175 ND_DEFAULTPRINT(bp, len); 176 return; 177 invalid: 178 nd_print_invalid(ndo); 179 } 180