diff options
Diffstat (limited to 'print-zep.c')
| -rw-r--r-- | print-zep.c | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/print-zep.c b/print-zep.c new file mode 100644 index 0000000..52901e7 --- /dev/null +++ b/print-zep.c @@ -0,0 +1,181 @@ +/* + * 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 */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#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_LCHECK_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_LCHECK_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_LCHECK_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); +} |