packet-sebek.c

   1 /* packet-sebek.c
   2  * Routines for Sebek - Kernel based data capture - packet dissection
   3  * Copyright 1999, Nathan Neulinger <nneul@umr.edu>
   4  *
   5  * See: http://project.honeynet.org/tools/sebek/ for more details
   6  *
   7  * $Id: packet-sebek.c,v 1.1 2003/11/19 22:13:29 nneul Exp $
   8  *
   9  * Ethereal - Network traffic analyzer
  10  * By Gerald Combs <gerald@ethereal.com>
  11  * Copyright 1998 Gerald Combs
  12  *
  13  * This program is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License
  15  * as published by the Free Software Foundation; either version 2
  16  * of the License, or (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  26  */
  27
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <stdio.h>
  33
  34 #include <string.h>
  35 #include <time.h>
  36 #include <math.h>
  37 #include <glib.h>
  38
  39 #ifdef NEED_SNPRINTF_H
  40 # include "snprintf.h"
  41 #endif
  42
  43 #include <epan/packet.h>
  44 #include <epan/resolv.h>
  45
  46 /*
  47         IP address:     32bit unsigned
  48         MAGIC Val:      32bit unsigned
  49         Sebek Ver:      16bit unsigned
  50         Type            16bit unsigned
  51         Counter:        32bit unsigned
  52         Time_sec:       32bit unsigned
  53         Time_usec:      32bit unsigned
  54         Proc ID:        32bit unsigned
  55         User ID:        32bit unsigned
  56         File Desc:      32bit unsigned
  57         Command:        12char array
  58         Length:         Data Length
  59
  60         Data:           Variable Length data
  61
  62  *
  63  */
  64
  65 /* By default, but can be completely different */
  66 #define UDP_PORT_SEBEK  1101
  67
  68 static int proto_sebek = -1;
  69
  70 static int hf_sebek_magic = -1;
  71 static int hf_sebek_version = -1;
  72 static int hf_sebek_type = -1;
  73 static int hf_sebek_counter = -1;
  74 static int hf_sebek_time = -1;
  75 static int hf_sebek_pid = -1;
  76 static int hf_sebek_uid = -1;
  77 static int hf_sebek_fd = -1;
  78 static int hf_sebek_cmd = -1;
  79 static int hf_sebek_len = -1;
  80 static int hf_sebek_data = -1;
  81
  82 static gint ett_sebek = -1;
  83
  84 /* dissect_sebek - dissects sebek packet data
  85  * tvb - tvbuff for packet data (IN)
  86  * pinfo - packet info
  87  * proto_tree - resolved protocol tree
  88  */
  89 static void
  90 dissect_sebek(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
  91 {
  92         proto_tree      *sebek_tree;
  93         proto_item      *ti;
  94         int offset = 0;
  95         int datalen = 0;
  96         nstime_t ts;
  97
  98         if (check_col(pinfo->cinfo, COL_PROTOCOL))
  99                 col_set_str(pinfo->cinfo, COL_PROTOCOL, "SEBEK");
 100
 101         if (check_col(pinfo->cinfo, COL_INFO))
 102         {
 103                 col_clear(pinfo->cinfo, COL_INFO);
 104                 col_set_str(pinfo->cinfo, COL_INFO, "SEBEK - ");
 105                 col_append_fstr(pinfo->cinfo, COL_INFO, " pid(%d)", tvb_get_ntohl(tvb, 20));
 106                 col_append_fstr(pinfo->cinfo, COL_INFO, " uid(%d)", tvb_get_ntohl(tvb, 24));
 107                 col_append_fstr(pinfo->cinfo, COL_INFO, " fd(%d)", tvb_get_ntohl(tvb, 28));
 108                 col_append_fstr(pinfo->cinfo, COL_INFO, " cmd: %s", tvb_get_string(tvb, 32, 12));
 109         }
 110
 111
 112         if (tree) {
 113                 /* Adding NTP item and subtree */
 114                 ti = proto_tree_add_item(tree, proto_sebek, tvb, 0, -1, FALSE);
 115                 sebek_tree = proto_item_add_subtree(ti, ett_sebek);
 116
 117                 proto_tree_add_item(sebek_tree, hf_sebek_magic, tvb, offset, 4, FALSE);
 118                 offset += 4;
 119
 120                 proto_tree_add_item(sebek_tree, hf_sebek_version, tvb, offset, 2, FALSE);
 121                 offset += 2;
 122
 123                 proto_tree_add_item(sebek_tree, hf_sebek_type, tvb, offset, 2, FALSE);
 124                 offset += 2;
 125
 126                 proto_tree_add_item(sebek_tree, hf_sebek_counter, tvb, offset, 4, FALSE);
 127                 offset += 4;
 128
 129         ts.secs = tvb_get_ntohl(tvb, offset);
 130         ts.nsecs = tvb_get_ntohl(tvb, offset+4);
 131         proto_tree_add_time(sebek_tree, hf_sebek_time, tvb, offset, 8, &ts);
 132         offset += 8;
 133
 134                 proto_tree_add_item(sebek_tree, hf_sebek_pid, tvb, offset, 4, FALSE);
 135                 offset += 4;
 136
 137                 proto_tree_add_item(sebek_tree, hf_sebek_uid, tvb, offset, 4, FALSE);
 138                 offset += 4;
 139
 140                 proto_tree_add_item(sebek_tree, hf_sebek_fd, tvb, offset, 4, FALSE);
 141                 offset += 4;
 142
 143                 proto_tree_add_item(sebek_tree, hf_sebek_cmd, tvb, offset, 12, FALSE);
 144                 offset += 12;
 145
 146                 datalen = tvb_get_letohl(tvb, offset);
 147                 proto_tree_add_item(sebek_tree, hf_sebek_len, tvb, offset, 4, FALSE);
 148                 offset += 4;
 149
 150                 proto_tree_add_item(sebek_tree, hf_sebek_data, tvb, offset, -1, FALSE);
 151
 152         }
 153 }
 154
 155 void
 156 proto_register_sebek(void)
 157 {
 158         static hf_register_info hf[] = {
 159                 { &hf_sebek_magic, {
 160                         "Magic", "sebek.magic", FT_UINT32, BASE_HEX,
 161                         NULL, 0, "Magic Number", HFILL }},
 162                 { &hf_sebek_version, {
 163                         "Version", "sebek.version", FT_UINT16, BASE_DEC,
 164                         NULL, 0, "Version Number", HFILL }},
 165                 { &hf_sebek_type, {
 166                         "Type", "sebek.type", FT_UINT16, BASE_DEC,
 167                         NULL, 0, "Type", HFILL }},
 168                 { &hf_sebek_counter, {
 169                         "Counter", "sebek.counter", FT_UINT32, BASE_DEC,
 170                         NULL, 0, "Counter", HFILL }},
 171                 { &hf_sebek_time, {
 172                         "Time", "sebek.time.sec", FT_ABSOLUTE_TIME, BASE_NONE,
 173                         NULL, 0, "Time", HFILL }},
 174                 { &hf_sebek_pid, {
 175                         "Process ID", "sebek.pid", FT_UINT32, BASE_DEC,
 176                         NULL, 0, "Process ID", HFILL }},
 177                 { &hf_sebek_uid, {
 178                         "User ID", "sebek.uid", FT_UINT32, BASE_DEC,
 179                         NULL, 0, "User ID", HFILL }},
 180                 { &hf_sebek_fd, {
 181                         "File Descriptor", "sebek.fd", FT_UINT32, BASE_DEC,
 182                         NULL, 0, "File Descriptor Number", HFILL }},
 183                 { &hf_sebek_cmd, {
 184                         "Command Name", "sebek.cmd", FT_STRING, 0,
 185                         NULL, 0, "Command Name", HFILL }},
 186                 { &hf_sebek_len, {
 187                         "Data Length", "sebek.len", FT_UINT32, BASE_DEC,
 188                         NULL, 0, "Data Length", HFILL }},
 189                 { &hf_sebek_data, {
 190                         "Data", "sebek.data", FT_STRING, 0,
 191                         NULL, 0, "Data", HFILL }},
 192         };
 193         static gint *ett[] = {
 194                 &ett_sebek,
 195         };
 196
 197         proto_sebek = proto_register_protocol("SEBEK - Kernel Data Capture", "SEBEK",
 198             "sebek");
 199         proto_register_field_array(proto_sebek, hf, array_length(hf));
 200         proto_register_subtree_array(ett, array_length(ett));
 201 }
 202
 203 void
 204 proto_reg_handoff_sebek(void)
 205 {
 206         dissector_handle_t sebek_handle;
 207
 208         sebek_handle = create_dissector_handle(dissect_sebek, proto_sebek);
 209         dissector_add("udp.port", UDP_PORT_SEBEK, sebek_handle);
 210 }