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
  23 #ifdef HAVE_CONFIG_H
  24 #include <config.h>
  25 #endif
  26
  27 #include <netdissect-stdinc.h>
  28
  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  *
  46  * |Preamble|Version|Channel ID|Device ID|CRC/LQI Mode|LQI Val|Reserved|Length|
  47  * |2 bytes |1 byte |  1 byte  | 2 bytes |   1 byte   |1 byte |7 bytes |1 byte|
  48  *
  49  * ZEP v2 Header will have the following format (if type=1/Data):
  50  * |Prmbl|Ver  |Type |ChnlID|DevID|C/L Mode|LQI|NTP TS|Seq#|Res |Len|
  51  * | 2   | 1   | 1   | 1    | 2   | 1      | 1 | 8    | 4  | 10 | 1 |
  52  *
  53  * ZEP v2 Header will have the following format (if type=2/Ack):
  54  * |Preamble|Version| Type |Sequence#|
  55  * |2 bytes |1 byte |1 byte| 4 bytes |
  56  *------------------------------------------------------------
  57  */
  58
  59 #define     FMAXINT (4294967296.0)  /* floating point rep. of MAXINT */
  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 = EXTRACT_BE_U_4(p);
  71         uf = EXTRACT_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("ZEP");
 110
 111         ND_TCHECK_LEN(bp, 8);
 112
 113         if (EXTRACT_U_1(bp) != 'E' || EXTRACT_U_1(bp + 1) != 'X')
 114                 goto trunc;
 115
 116         version = EXTRACT_U_1(bp + 2);
 117         ND_PRINT("v%d ", version);
 118
 119         if (version == 1) {
 120                 /* ZEP v1 packet. */
 121                 ND_TCHECK_LEN(bp, 16);
 122                 ND_PRINT("Channel ID %d, Device ID 0x%04x, ",
 123                          EXTRACT_U_1(bp + 3), EXTRACT_BE_U_2(bp + 4));
 124                 if (EXTRACT_U_1(bp + 6))
 125                         ND_PRINT("CRC, ");
 126                 else
 127                         ND_PRINT("LQI %d, ", EXTRACT_U_1(bp + 7));
 128                 inner_len = EXTRACT_U_1(bp + 15);
 129                 ND_PRINT("inner len = %d", inner_len);
 130
 131                 bp += 16;
 132                 len -= 16;
 133         } else {
 134                 /* ZEP v2 packet. */
 135                 if (EXTRACT_U_1(bp + 3) == 2) {
 136                         /* ZEP v2 ack. */
 137                         seq_no = EXTRACT_BE_U_4(bp + 4);
 138                         ND_PRINT("ACK, seq# = %d", seq_no);
 139                         inner_len = 0;
 140                         bp += 8;
 141                         len -= 8;
 142                 } else {
 143                         /* ZEP v2 data, or some other. */
 144                         ND_TCHECK_LEN(bp, 32);
 145
 146                         ND_PRINT("Type %d, Channel ID %d, Device ID 0x%04x, ",
 147                                  EXTRACT_U_1(bp + 3), EXTRACT_U_1(bp + 4),
 148                                  EXTRACT_BE_U_2(bp + 5));
 149                         if (EXTRACT_U_1(bp + 7))
 150                                 ND_PRINT("CRC, ");
 151                         else
 152                                 ND_PRINT("LQI %d, ", EXTRACT_U_1(bp + 8));
 153
 154                         zep_print_ts(ndo, bp + 9);
 155                         seq_no = EXTRACT_BE_U_4(bp + 17);
 156                         inner_len = EXTRACT_U_1(bp + 31);
 157                         ND_PRINT(", seq# = %d, inner len = %d",
 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                         bp += len;
 169                         len = 0;
 170                 }
 171         }
 172
 173         if (!ndo->ndo_suppress_default_print)
 174                 ND_DEFAULTPRINT(bp, len);
 175
 176         return;
 177  trunc:
 178         ND_PRINT(" [|ZEP]");
 179 }
 180
 181 /*
 182  * Local Variables:
 183  * c-style: whitesmith
 184  * c-basic-offset: 8
 185  * End:
 186  */