epan/dissectors/packet-pcli.c

   1 /* packet-pcli.c
   2  * Routines for Packet Cable Lawful Intercept packet disassembly
   3  * Packet Cable Lawful Intercept is detailed at
   4  * http://www.cablelabs.com/specifications/archives/PKT-SP-ESP-I01-991229.pdf
   5  * Chapter 4 ( Call Content Connection Interface )
   6  *
   7  * $Id$
   8  *
   9  * Copyright (c) 2000 by Ed Warnicke <hagbard@physics.rutgers.edu>
  10  *
  11  * Wireshark - Network traffic analyzer
  12  * By Gerald Combs <gerald@wireshark.org>
  13  * Copyright 1999 Gerald Combs
  14  *
  15  * This program is free software; you can redistribute it and/or
  16  * modify it under the terms of the GNU General Public License
  17  * as published by the Free Software Foundation; either version 2
  18  * of the License, or (at your option) any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  * GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program; if not, write to the Free Software
  27  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  28  */
  29
  30 /* Include files */
  31
  32 #include "config.h"
  33
  34 #include <glib.h>
  35
  36 #include <epan/packet.h>
  37 #include <epan/addr_resolv.h>
  38 #include <epan/prefs.h>
  39 #include <epan/strutil.h>
  40
  41 /* Define udp_port for lawful intercept */
  42
  43 #define UDP_PORT_PCLI 9000
  44
  45 void proto_reg_handoff_pcli(void);
  46
  47 /* Define the pcli proto */
  48
  49 static int proto_pcli = -1;
  50
  51 /* Define headers for pcli */
  52
  53 static int hf_pcli_cccid = -1;
  54
  55 /* Define the tree for pcli */
  56
  57 static int ett_pcli = -1;
  58
  59 /*
  60  * Here are the global variables associated with the preferences
  61  * for pcli
  62  */
  63
  64 static guint global_udp_port_pcli = UDP_PORT_PCLI;
  65
  66 /* A static handle for the ip dissector */
  67 static dissector_handle_t ip_handle;
  68
  69 static void
  70 dissect_pcli(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) {
  71
  72     guint32 cccid;
  73     proto_tree *ti,*pcli_tree;
  74     tvbuff_t * next_tvb;
  75
  76     /* Set the protocol column */
  77     col_set_str(pinfo->cinfo, COL_PROTOCOL, "PCLI");
  78
  79     /* Get the CCCID */
  80     cccid = tvb_get_ntohl(tvb,0);
  81
  82     /* Set the info column */
  83     col_add_fstr(pinfo->cinfo, COL_INFO, "CCCID: %u",cccid);
  84
  85     /*
  86      *If we have a non-null tree (ie we are building the proto_tree
  87      * instead of just filling out the columns ), then add a PLCI
  88      * tree node and put a CCCID header element under it.
  89      */
  90     if(tree) {
  91         ti = proto_tree_add_item(tree, proto_pcli, tvb, 0, 0, ENC_NA);
  92         pcli_tree = proto_item_add_subtree(ti,ett_pcli);
  93         proto_tree_add_uint(pcli_tree, hf_pcli_cccid, tvb, 0, 4, cccid);
  94     }
  95
  96     /*
  97      * Hand off to the IP dissector.
  98      */
  99     next_tvb = tvb_new_subset_remaining(tvb,4);
 100     call_dissector(ip_handle,next_tvb,pinfo,tree);
 101 }
 102
 103 void
 104 proto_register_pcli(void) {
 105     static hf_register_info hf[] = {
 106         { &hf_pcli_cccid,
 107             { "CCCID", "pcli.cccid", FT_UINT32, BASE_DEC, NULL, 0x0,
 108               "Call Content Connection Identifier", HFILL }},
 109     };
 110
 111     static gint *ett[] = {
 112         &ett_pcli,
 113     };
 114
 115     module_t *pcli_module;
 116
 117     proto_pcli = proto_register_protocol("Packet Cable Lawful Intercept",
 118                                          "PCLI","pcli");
 119     proto_register_field_array(proto_pcli,hf,array_length(hf));
 120     proto_register_subtree_array(ett,array_length(ett));
 121
 122     pcli_module = prefs_register_protocol(proto_pcli, proto_reg_handoff_pcli);
 123     prefs_register_uint_preference(pcli_module, "udp_port",
 124                                    "PCLI UDP Port",
 125                                    "The UDP port on which "
 126                                    "Packet Cable Lawful Intercept "
 127                                    "packets will be sent",
 128                                    10,&global_udp_port_pcli);
 129
 130 }
 131
 132 /* The registration hand-off routing */
 133
 134 void
 135 proto_reg_handoff_pcli(void) {
 136     static gboolean pcli_initialized = FALSE;
 137     static dissector_handle_t pcli_handle;
 138     static guint udp_port_pcli;
 139
 140     if(!pcli_initialized) {
 141         pcli_handle = create_dissector_handle(dissect_pcli,proto_pcli);
 142         ip_handle = find_dissector("ip");
 143         pcli_initialized = TRUE;
 144     } else {
 145         dissector_delete_uint("udp.port",udp_port_pcli,pcli_handle);
 146     }
 147
 148     udp_port_pcli = global_udp_port_pcli;
 149
 150     dissector_add_uint("udp.port",global_udp_port_pcli,pcli_handle);
 151 }
 152
 153 /*
 154  * Editor modelines  -  http://www.wireshark.org/tools/modelines.html
 155  *
 156  * Local variables:
 157  * c-basic-offset: 4
 158  * tab-width: 8
 159  * indent-tabs-mode: nil
 160  * End:
 161  *
 162  * vi: set shiftwidth=4 tabstop=8 expandtab:
 163  * :indentSize=4:tabSize=8:noTabs=true:
 164  */