The Tcpdump Group git mirrors - tcpdump/blob - print-zep.c

   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 #include "netdissect.h"
  31
  32 #include "extract.h"
  33
  34 /* From wireshark packet-zep.c:
  35  *
  36  ***********************************************************************
  37  *
  38  * ZEP Packets must be received in the following format:
  39  *
  40  * |UDP Header|  ZEP Header |IEEE 802.15.4 Packet|
  41  * | 8 bytes  | 16/32 bytes |    <= 127 bytes    |
  42  *
  43  ***********************************************************************
  44  *
  45  * ZEP v1 Header will have the following format:
  46  *
  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     FMAXINT (4294967296.0)  /* floating point rep. of MAXINT */
  61 #define     JAN_1970        2208988800U
  62
  63 /* Print timestamp */
  64 static void zep_print_ts(netdissect_options *ndo, const u_char *p)
  65 {
  66         int32_t i;
  67         uint32_t uf;
  68         uint32_t f;
  69         float ff;
  70
  71         i = GET_BE_U_4(p);
  72         uf = GET_BE_U_4(p + 4);
  73         ff = (float) uf;
  74         if (ff < 0.0)           /* some compilers are buggy */
  75                 ff += FMAXINT;
  76         ff = (float) (ff / FMAXINT); /* shift radix point by 32 bits */
  77         f = (uint32_t) (ff * 1000000000.0);  /* treat fraction as parts per
  78                                                 billion */
  79         ND_PRINT("%u.%09d", i, f);
  80
  81 #ifdef HAVE_STRFTIME
  82         /*
  83          * print the time in human-readable format.
  84          */
  85         if (i) {
  86                 time_t seconds = i - JAN_1970;
  87                 struct tm *tm;
  88                 char time_buf[128];
  89
  90                 tm = localtime(&seconds);
  91                 strftime(time_buf, sizeof (time_buf), "%Y/%m/%d %H:%M:%S", tm);
  92                 ND_PRINT(" (%s)", time_buf);
  93         }
  94 #endif
  95 }
  96
  97 /*
  98  * Main function to print packets.
  99  */
 100
 101 void
 102 zep_print(netdissect_options *ndo,
 103           const u_char *bp, u_int len)
 104 {
 105         uint8_t version, inner_len;
 106         uint32_t seq_no;
 107
 108         ndo->ndo_protocol = "zep";
 109
 110         nd_print_protocol_caps(ndo);
 111
 112         ND_TCHECK_LEN(bp, 8);
 113
 114         if (GET_U_1(bp) != 'E' || GET_U_1(bp + 1) != 'X')
 115                 goto trunc;
 116
 117         version = GET_U_1(bp + 2);
 118         ND_PRINT("v%d ", version);
 119
 120         if (version == 1) {
 121                 /* ZEP v1 packet. */
 122                 ND_TCHECK_LEN(bp, 16);
 123                 ND_PRINT("Channel ID %d, Device ID 0x%04x, ",
 124                          GET_U_1(bp + 3), GET_BE_U_2(bp + 4));
 125                 if (GET_U_1(bp + 6))
 126                         ND_PRINT("CRC, ");
 127                 else
 128                         ND_PRINT("LQI %d, ", GET_U_1(bp + 7));
 129                 inner_len = GET_U_1(bp + 15);
 130                 ND_PRINT("inner len = %d", inner_len);
 131
 132                 bp += 16;
 133                 len -= 16;
 134         } else {
 135                 /* ZEP v2 packet. */
 136                 if (GET_U_1(bp + 3) == 2) {
 137                         /* ZEP v2 ack. */
 138                         seq_no = GET_BE_U_4(bp + 4);
 139                         ND_PRINT("ACK, seq# = %d", seq_no);
 140                         inner_len = 0;
 141                         bp += 8;
 142                         len -= 8;
 143                 } else {
 144                         /* ZEP v2 data, or some other. */
 145                         ND_TCHECK_LEN(bp, 32);
 146
 147                         ND_PRINT("Type %d, Channel ID %d, Device ID 0x%04x, ",
 148                                  GET_U_1(bp + 3), GET_U_1(bp + 4),
 149                                  GET_BE_U_2(bp + 5));
 150                         if (GET_U_1(bp + 7))
 151                                 ND_PRINT("CRC, ");
 152                         else
 153                                 ND_PRINT("LQI %d, ", GET_U_1(bp + 8));
 154
 155                         zep_print_ts(ndo, bp + 9);
 156                         seq_no = GET_BE_U_4(bp + 17);
 157                         inner_len = GET_U_1(bp + 31);
 158                         ND_PRINT(", seq# = %d, inner len = %d",
 159                                  seq_no, inner_len);
 160                         bp += 32;
 161                         len -= 32;
 162                 }
 163         }
 164
 165         if (inner_len != 0) {
 166                 /* Call 802.15.4 dissector. */
 167                 ND_PRINT("\n\t");
 168                 if (ieee802_15_4_print(ndo, bp, inner_len)) {
 169                         bp += len;
 170                         len = 0;
 171                 }
 172         }
 173
 174         if (!ndo->ndo_suppress_default_print)
 175                 ND_DEFAULTPRINT(bp, len);
 176
 177         return;
 178  trunc:
 179         nd_print_trunc(ndo);
 180 }