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 */ 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 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_PRINT("Channel ID %u, Device ID 0x%04x, ", 127 GET_U_1(bp + 3), GET_BE_U_2(bp + 4)); 128 if (GET_U_1(bp + 6)) 129 ND_PRINT("CRC, "); 130 else 131 ND_PRINT("LQI %u, ", GET_U_1(bp + 7)); 132 inner_len = GET_U_1(bp + 15); 133 ND_PRINT("inner len = %u", inner_len); 134 135 bp += 16; 136 len -= 16; 137 } else { 138 /* ZEP v2 packet. */ 139 if (GET_U_1(bp + 3) == 2) { 140 /* ZEP v2 ack. */ 141 seq_no = GET_BE_U_4(bp + 4); 142 ND_PRINT("ACK, seq# = %u", seq_no); 143 inner_len = 0; 144 bp += 8; 145 len -= 8; 146 } else { 147 /* ZEP v2 data, or some other. */ 148 ND_PRINT("Type %u, Channel ID %u, Device ID 0x%04x, ", 149 GET_U_1(bp + 3), GET_U_1(bp + 4), 150 GET_BE_U_2(bp + 5)); 151 if (GET_U_1(bp + 7)) 152 ND_PRINT("CRC, "); 153 else 154 ND_PRINT("LQI %u, ", GET_U_1(bp + 8)); 155 156 zep_print_ts(ndo, bp + 9); 157 seq_no = GET_BE_U_4(bp + 17); 158 inner_len = GET_U_1(bp + 31); 159 ND_PRINT(", seq# = %u, inner len = %u", 160 seq_no, inner_len); 161 bp += 32; 162 len -= 32; 163 } 164 } 165 166 if (inner_len != 0) { 167 /* Call 802.15.4 dissector. */ 168 ND_PRINT("\n\t"); 169 if (ieee802_15_4_print(ndo, bp, inner_len)) { 170 ND_TCHECK_LEN(bp, len); 171 bp += len; 172 len = 0; 173 } 174 } 175 176 if (!ndo->ndo_suppress_default_print) 177 ND_DEFAULTPRINT(bp, len); 178 } 179