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wireshark/epan/dissectors/packet-simulcrypt.c

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/* packet-simulcrypt.c
* Simulcrypt protocol across SCS - ECMG interface as defined in ETSI TS 103.197 v 1.5.1
*
* David Castleford, Orange Labs / France Telecom R&D
* Oct 2008
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <glib.h>
#include <epan/packet.h>
#include <epan/dissectors/packet-tcp.h>
#include <epan/prefs.h>
#define PROTO_TAG_SIMULCRYPT "SIMULCRYPT"
#define CA_SYSTEM_ID_MIKEY 0x9999 /* CA_system_ID corresponding to MIKEY ECM */
#define CA_SYSTEM_ID_MIKEY_PROTO "mikey" /* Protocol name to be used to "decode as" ECMs with CA_SYSTEM_ID_MIKEY */
/* Tecm_interpretation links ca_system_id to ecmg port and protocol name for dissection of ecm_datagram in ECM_Response message
* Currently size is 1 as only have MIKEY protocol but could add extra protocols
* could add option in preferences for new ca_system_id for new protocol for example
*/
typedef struct Tecm_interpretation
{
int ca_system_id;
char *protocol_name;
dissector_handle_t protocol_handle;
guint ecmg_port;
} ecm_interpretation;
#define ECM_MIKEY_INDEX 0 /* must agree with tab_ecm_inter initialization */
static ecm_interpretation tab_ecm_inter[]={
{CA_SYSTEM_ID_MIKEY, CA_SYSTEM_ID_MIKEY_PROTO, NULL, -1}
};
#define ECM_INTERPRETATION_SIZE (sizeof(tab_ecm_inter)/sizeof(ecm_interpretation))
static void dissect_simulcrypt_message(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
static guint get_simulcrypt_message_len(packet_info *pinfo, tvbuff_t *tvb, int offset);
/* Wireshark ID of the SIMULCRYPT protocol */
static guint proto_simulcrypt = -1;
/* Preferences (with default values) */
static guint global_simulcrypt_tcp_port = 0; /* Simulcrypt registered only if pref set to non-zero value */
static int ca_system_id_mikey = CA_SYSTEM_ID_MIKEY; /* MIKEY ECM CA_system_ID */
/* MIKEY payload start bytes */
/*unsigned char mikey_start[3]={0x01,0x00,0x15};
* mikey_start[0]=0x01; first byte mikey payload (version)
* mikey_start[1]=0x00; second byte mikey payload (data type)
* mikey_start[2]=0x15; third byte (next payload)
*/
/* Simulcrypt ECMG - SCS */
#define SIMULCRYPT_CHANNEL_SETUP 0x0001
#define SIMULCRYPT_CHANNEL_TEST 0x0002
#define SIMULCRYPT_CHANNEL_STATUS 0x0003
#define SIMULCRYPT_CHANNEL_CLOSE 0x0004
#define SIMULCRYPT_CHANNEL_ERROR 0x0005
#define SIMULCRYPT_STREAM_SETUP 0x0101
#define SIMULCRYPT_STREAM_TEST 0x0102
#define SIMULCRYPT_STREAM_STATUS 0x0103
#define SIMULCRYPT_STREAM_CLOSE_REQUEST 0x0104
#define SIMULCRYPT_STREAM_CLOSE_RESPONSE 0x0105
#define SIMULCRYPT_STREAM_ERROR 0x0106
#define SIMULCRYPT_CW_PROVISION 0x0201
#define SIMULCRYPT_ECM_RESPONSE 0x0202
static const value_string messagetypenames[] = {
{ SIMULCRYPT_CHANNEL_SETUP, "CHANNEL_SETUP" },
{ SIMULCRYPT_CHANNEL_TEST, "CHANNEL_TEST" },
{ SIMULCRYPT_CHANNEL_STATUS, "CHANNEL_STATUS" },
{ SIMULCRYPT_CHANNEL_CLOSE, "CHANNEL_CLOSE" },
{ SIMULCRYPT_CHANNEL_ERROR, "CHANNEL_ERROR" },
{ SIMULCRYPT_STREAM_SETUP, "STREAM_SETUP" },
{ SIMULCRYPT_STREAM_TEST, "STREAM_TEST" },
{ SIMULCRYPT_STREAM_STATUS, "STREAM_STATUS" },
{ SIMULCRYPT_STREAM_CLOSE_REQUEST, "STREAM_CLOSE_REQUEST" },
{ SIMULCRYPT_STREAM_CLOSE_RESPONSE, "STREAM_CLOSE_RESPONSE" },
{ SIMULCRYPT_STREAM_ERROR, "STREAM_ERROR" },
{ SIMULCRYPT_CW_PROVISION, "CW_PROVISION" },
{ SIMULCRYPT_ECM_RESPONSE, "ECM_RESPONSE" },
{ 0, NULL}
};
/* Simulcrypt Parameter Types */
#define SIMULCRYPT_DVB_RESERVED 0x0000
#define SIMULCRYPT_SUPER_CAS_ID 0x0001
#define SIMULCRYPT_SECTION_TSPKT_FLAG 0x0002
#define SIMULCRYPT_DELAY_START 0x0003
#define SIMULCRYPT_DELAY_STOP 0x0004
#define SIMULCRYPT_TRANSITION_DELAY_START 0x0005
#define SIMULCRYPT_TRANSITION_DELAY_STOP 0x0006
#define SIMULCRYPT_ECM_REP_PERIOD 0x0007
#define SIMULCRYPT_MAX_STREAMS 0x0008
#define SIMULCRYPT_MIN_CP_DURATION 0x0009
#define SIMULCRYPT_LEAD_CW 0x000A
#define SIMULCRYPT_CW_PER_MESSAGE 0x000B
#define SIMULCRYPT_MAX_COMP_TIME 0x000C
#define SIMULCRYPT_ACCESS_CRITERIA 0x000D
#define SIMULCRYPT_ECM_CHANNEL_ID 0x000E
#define SIMULCRYPT_ECM_STREAM_ID 0x000F
#define SIMULCRYPT_NOMINAL_CP_DURATION 0x0010
#define SIMULCRYPT_ACCESS_CRITERIA_TRANSFER_MODE 0x0011
#define SIMULCRYPT_CP_NUMBER 0x0012
#define SIMULCRYPT_CP_DURATION 0x0013
#define SIMULCRYPT_CP_CW_COMBINATION 0x0014
#define SIMULCRYPT_ECM_DATAGRAM 0x0015
#define SIMULCRYPT_AC_DELAY_START 0x0016
#define SIMULCRYPT_AC_DELAY_STOP 0x0017
#define SIMULCRYPT_CW_ENCRYPTION 0x0018
#define SIMULCRYPT_ECM_ID 0x0019
#define SIMULCRYPT_ERROR_STATUS 0x7000
#define SIMULCRYPT_ERROR_INFORMATION 0x7001
static const value_string parametertypenames[] = {
{ SIMULCRYPT_DVB_RESERVED, "DVB_RESERVED" },
{ SIMULCRYPT_SUPER_CAS_ID, "SUPER_CAS_ID" },
{ SIMULCRYPT_SECTION_TSPKT_FLAG, "SECTION_TSPKT_FLAG" },
{ SIMULCRYPT_DELAY_START, "DELAY_START" },
{ SIMULCRYPT_DELAY_STOP, "DELAY_STOP" },
{ SIMULCRYPT_TRANSITION_DELAY_START, "TRANSITION_DELAY_START" },
{ SIMULCRYPT_TRANSITION_DELAY_STOP, "TRANSITION_DELAY_STOP" },
{ SIMULCRYPT_ECM_REP_PERIOD, "ECM_REP_PERIOD" },
{ SIMULCRYPT_MAX_STREAMS, "MAX_STREAMS" },
{ SIMULCRYPT_MIN_CP_DURATION, "MIN_CP_DURATION" },
{ SIMULCRYPT_LEAD_CW, "LEAD_CW" },
{ SIMULCRYPT_CW_PER_MESSAGE, "CW_PER_MESSAGE" },
{ SIMULCRYPT_MAX_COMP_TIME, "MAX_COMP_TIME" },
{ SIMULCRYPT_ACCESS_CRITERIA, "ACCESS_CRITERIA" },
{ SIMULCRYPT_ECM_CHANNEL_ID, "ECM_CHANNEL_ID" },
{ SIMULCRYPT_ECM_STREAM_ID, "ECM_STREAM_ID" },
{ SIMULCRYPT_NOMINAL_CP_DURATION, "NOMINAL_CP_DURATION" },
{ SIMULCRYPT_ACCESS_CRITERIA_TRANSFER_MODE, "ACCESS_CRITERIA_TRANSFER_MODE" },
{ SIMULCRYPT_CP_NUMBER, "CP_NUMBER" },
{ SIMULCRYPT_CP_DURATION, "CP_DURATION" },
{ SIMULCRYPT_CP_CW_COMBINATION, "CP_CW_COMBINATION" },
{ SIMULCRYPT_ECM_DATAGRAM, "ECM_DATAGRAM" },
{ SIMULCRYPT_AC_DELAY_START, "AC_DELAY_START" },
{ SIMULCRYPT_AC_DELAY_STOP, "AC_DELAY_STOP" },
{ SIMULCRYPT_CW_ENCRYPTION, "CW_ENCRYPTION" },
{ SIMULCRYPT_ECM_ID, "ECM_ID" },
{ SIMULCRYPT_ERROR_STATUS, "ERROR_STATUS" },
{ SIMULCRYPT_ERROR_INFORMATION, "ERROR_INFORMATION" },
{ 0, NULL}
};
/* The following hf_* variables are used to hold the Wireshark IDs of
* our header fields; they are filled out when we call
* proto_register_field_array() in proto_register_simulcrypt()
*/
static gint hf_simulcrypt_header = -1;
static gint hf_simulcrypt_version = -1;
static gint hf_simulcrypt_message_type = -1;
static gint hf_simulcrypt_message_length = -1;
static gint hf_simulcrypt_message = -1;
static gint hf_simulcrypt_parameter = -1;
static gint hf_simulcrypt_parameter_type = -1;
static gint hf_simulcrypt_parameter_length = -1;
static gint hf_simulcrypt_ca_system_id = -1;
static gint hf_simulcrypt_ca_subsystem_id = -1;
static gint hf_simulcrypt_super_cas_id = -1;
static gint hf_simulcrypt_section_tspkt_flag = -1;
static gint hf_simulcrypt_ecm_channel_id = -1;
static gint hf_simulcrypt_delay_start = -1;
static gint hf_simulcrypt_delay_stop = -1;
static gint hf_simulcrypt_ac_delay_start = -1;
static gint hf_simulcrypt_ac_delay_stop = -1;
static gint hf_simulcrypt_transition_delay_start = -1;
static gint hf_simulcrypt_transition_delay_stop = -1;
static gint hf_simulcrypt_ecm_rep_period = -1;
static gint hf_simulcrypt_max_streams = -1;
static gint hf_simulcrypt_min_cp_duration = -1;
static gint hf_simulcrypt_lead_cw = -1;
static gint hf_simulcrypt_cw_per_msg = -1;
static gint hf_simulcrypt_max_comp_time = -1;
static gint hf_simulcrypt_access_criteria = -1;
static gint hf_simulcrypt_ecm_stream_id = -1;
static gint hf_simulcrypt_nominal_cp_duration = -1;
static gint hf_simulcrypt_access_criteria_transfer_mode = -1;
static gint hf_simulcrypt_cp_number = -1;
static gint hf_simulcrypt_cp_duration = -1;
static gint hf_simulcrypt_cp_cw_combination = -1;
static gint hf_simulcrypt_ecm_datagram = -1;
static gint hf_simulcrypt_cw_encryption = -1;
static gint hf_simulcrypt_ecm_id = -1;
static gint hf_simulcrypt_error_status = -1;
static gint hf_simulcrypt_error_information = -1;
/* These are the ids of the subtrees that we may be creating */
static gint ett_simulcrypt = -1;
static gint ett_simulcrypt_header = -1;
static gint ett_simulcrypt_message = -1;
static gint ett_simulcrypt_parameter = -1;
static gint ett_simulcrypt_super_cas_id = -1;
static gint ett_simulcrypt_ecm_datagram = -1;
#define FRAME_HEADER_LEN 8
/* The main dissecting routine */
static void dissect_simulcrypt(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
tcp_dissect_pdus(tvb, pinfo, tree, TRUE, FRAME_HEADER_LEN,
get_simulcrypt_message_len, dissect_simulcrypt_message);
}
/* Informative tree structure is shown here:
* TREE -
* - HEADER
* version
* message type
* message length
* - MESSAGE
* - TYPE of parameter
* length of parameter
value of parameter
- PARAMETER (optional branch for certain parameters only)
* parameter value sub items here
* End informative tree structure
*/
/* This method dissects fully reassembled messages */
static void dissect_simulcrypt_message(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_item *simulcrypt_item;
proto_tree *simulcrypt_tree;
proto_tree *simulcrypt_header_tree;
proto_tree *simulcrypt_message_tree;
proto_tree *simulcrypt_parameter_tree;
proto_tree *simulcrypt_super_cas_id_tree;
proto_tree *simulcrypt_ecm_datagram_tree;
guint16 type;
tvbuff_t *next_tvb;
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, PROTO_TAG_SIMULCRYPT);
/* Clear out stuff in the info column */
if(check_col(pinfo->cinfo,COL_INFO))
{
col_clear(pinfo->cinfo,COL_INFO);
}
/* get 2 byte type value */
type = tvb_get_ntohs(tvb, 1); /* 2 bytes starting at offset 1 are the message type */
if (check_col(pinfo->cinfo, COL_INFO))
{
col_add_fstr(pinfo->cinfo, COL_INFO, "%d > %d Info Type:[%s]",
pinfo->srcport, pinfo->destport,
val_to_str(type, messagetypenames, "Unknown Type:0x%02x"));
}
if (tree)
{
/* we are being asked for details */
guint32 offset = 0;
guint32 msg_length;
simulcrypt_item = proto_tree_add_item(tree, proto_simulcrypt, tvb, 0, -1, FALSE);
simulcrypt_tree = proto_item_add_subtree(simulcrypt_item, ett_simulcrypt);
/* Simulcrypt_tree analysis */
/* we are being asked for details */
/* ADD HEADER BRANCH */
simulcrypt_item = proto_tree_add_item(simulcrypt_tree, hf_simulcrypt_header, tvb, offset, 5, FALSE );
simulcrypt_header_tree = proto_item_add_subtree(simulcrypt_item, ett_simulcrypt_header);
proto_item_append_text(simulcrypt_header_tree, ", Length: %s", "5 bytes"); /* add text to Header tree indicating Length 5 bytes */
/* Simulcrypt_header_tree analysis */
/* Message Version 1 Byte */
proto_tree_add_item(simulcrypt_header_tree, hf_simulcrypt_version, tvb, offset, 1, FALSE);
offset+=1;
/* Message Type 2 Bytes */
proto_tree_add_item(simulcrypt_header_tree, hf_simulcrypt_message_type, tvb, offset, 2, FALSE);
offset+=2;
/* Message Length 2 Bytes */
simulcrypt_item=proto_tree_add_item(simulcrypt_header_tree, hf_simulcrypt_message_length, tvb, offset, 2, FALSE);
proto_item_append_text(simulcrypt_item, " (bytes)");
msg_length = tvb_get_ntohs(tvb, offset); /* read 2 byte message length value */
offset+=2;
/* ADD MESSAGE BRANCH */
simulcrypt_item = proto_tree_add_item( simulcrypt_tree, hf_simulcrypt_message, tvb, offset, -1, FALSE );
simulcrypt_message_tree = proto_item_add_subtree(simulcrypt_item, ett_simulcrypt_message);
proto_item_append_text(simulcrypt_message_tree, " containing TLV parameters"); /* add text to Message tree */
proto_item_append_text(simulcrypt_message_tree, ", Length: %d (bytes)", msg_length); /* add length info to message_tree */
/* end header details */
/* Simulcrypt_message_tree analysis */
/* we are being asked for details */
/* Navigate through message after header to find one or more parameters */
while (offset < (msg_length+5)) /* offset is from beginning of the 5 byte header */
{
guint16 plen; /* parameter length */
guint16 ptype; /* parameter type */
guint32 pvaluedec; /* parameter decimal value */
gchar *pvalue_char; /* parameter value string */
int ca_system_id;
guint i;
/* Parameter Type 2 Bytes */
ptype= tvb_get_ntohs(tvb, offset); /* read 2 byte type value */
/* Parameter Length 2 Bytes */
plen=tvb_get_ntohs(tvb, offset+2); /* read 2 byte length value */
/* Parameter Value plen Bytes */
pvalue_char = tvb_bytes_to_str(tvb, offset+4, plen);
simulcrypt_item = proto_tree_add_item( simulcrypt_message_tree, hf_simulcrypt_parameter, tvb, offset, plen+2+2, FALSE );
/* add length and value info to type */
proto_item_append_text(simulcrypt_item, ": Type=%s", val_to_str(ptype, parametertypenames, "Unknown Type:0x%02x"));
proto_item_append_text(simulcrypt_item, ", Value Length=%d (bytes)", plen); /* add length info to parameter */
proto_item_append_text(simulcrypt_item, ", Value=0x%s", pvalue_char); /* add value info to parameter */
/* add subtree for parameter type, length and value items */
simulcrypt_parameter_tree = proto_item_add_subtree(simulcrypt_item, ett_simulcrypt_parameter); /* add subtree for Length and Value */
simulcrypt_item=proto_tree_add_item( simulcrypt_parameter_tree, hf_simulcrypt_parameter_type, tvb, offset, 2, FALSE); /* parameter type */
simulcrypt_item=proto_tree_add_item( simulcrypt_parameter_tree, hf_simulcrypt_parameter_length, tvb, offset+2, 2, FALSE); /* length item */
offset += 2+2; /* offset --> parameter value */
proto_item_append_text(simulcrypt_item, " (bytes)");
switch(ptype)
{
case SIMULCRYPT_SUPER_CAS_ID:
/* add super_cas_id item */
simulcrypt_item = proto_tree_add_item( simulcrypt_parameter_tree, hf_simulcrypt_super_cas_id, tvb, offset, plen, FALSE); /* value item */
simulcrypt_super_cas_id_tree = proto_item_add_subtree(simulcrypt_item, ett_simulcrypt_super_cas_id);
/* Simulcrypt_super_cas_id_tree */
simulcrypt_item = proto_tree_add_item(simulcrypt_super_cas_id_tree, hf_simulcrypt_ca_system_id, tvb, offset, 2, FALSE );
/* Test for known CA_System_ID */
ca_system_id = tvb_get_ntohs(tvb,offset);
for(i=0;i<ECM_INTERPRETATION_SIZE;i++)
{
if(tab_ecm_inter[i].ca_system_id==ca_system_id)
{
tab_ecm_inter[i].ecmg_port=pinfo->destport;
proto_item_append_text(simulcrypt_item, ", Port %d, Protocol %s",tab_ecm_inter[i].ecmg_port, tab_ecm_inter[i].protocol_name);
break;
}
}
simulcrypt_item = proto_tree_add_item(simulcrypt_super_cas_id_tree, hf_simulcrypt_ca_subsystem_id, tvb, offset+2, 2, FALSE );
break;
case SIMULCRYPT_SECTION_TSPKT_FLAG:
simulcrypt_item = proto_tree_add_item( simulcrypt_parameter_tree, hf_simulcrypt_section_tspkt_flag, tvb, offset, plen, FALSE); /* value item */
break;
case SIMULCRYPT_ECM_CHANNEL_ID:
simulcrypt_item = proto_tree_add_item( simulcrypt_parameter_tree, hf_simulcrypt_ecm_channel_id, tvb, offset, plen, FALSE);
break;
case SIMULCRYPT_DELAY_START:
simulcrypt_item = proto_tree_add_item( simulcrypt_parameter_tree, hf_simulcrypt_delay_start, tvb, offset, plen, FALSE);
proto_item_append_text(simulcrypt_item, " ms");
break;
case SIMULCRYPT_DELAY_STOP:
simulcrypt_item = proto_tree_add_item( simulcrypt_parameter_tree, hf_simulcrypt_delay_stop, tvb, offset, plen, FALSE);
proto_item_append_text(simulcrypt_item, " ms");
break;
case SIMULCRYPT_TRANSITION_DELAY_START:
simulcrypt_item = proto_tree_add_item( simulcrypt_parameter_tree, hf_simulcrypt_transition_delay_start, tvb, offset, plen, FALSE);
proto_item_append_text(simulcrypt_item, " ms");
break;
case SIMULCRYPT_TRANSITION_DELAY_STOP:
simulcrypt_item = proto_tree_add_item( simulcrypt_parameter_tree, hf_simulcrypt_transition_delay_stop, tvb, offset, plen, FALSE);
proto_item_append_text(simulcrypt_item, " ms");
break;
case SIMULCRYPT_AC_DELAY_START:
simulcrypt_item = proto_tree_add_item( simulcrypt_parameter_tree, hf_simulcrypt_ac_delay_start, tvb, offset, plen, FALSE);
proto_item_append_text(simulcrypt_item, " ms");
break;
case SIMULCRYPT_AC_DELAY_STOP:
simulcrypt_item = proto_tree_add_item( simulcrypt_parameter_tree, hf_simulcrypt_ac_delay_stop, tvb, offset, plen, FALSE);
proto_item_append_text(simulcrypt_item, " ms");
break;
case SIMULCRYPT_ECM_REP_PERIOD:
simulcrypt_item = proto_tree_add_item( simulcrypt_parameter_tree, hf_simulcrypt_ecm_rep_period, tvb, offset, plen, FALSE);
proto_item_append_text(simulcrypt_item, " ms");
break;
case SIMULCRYPT_MAX_STREAMS:
simulcrypt_item = proto_tree_add_item( simulcrypt_parameter_tree, hf_simulcrypt_max_streams, tvb, offset, plen, FALSE);
break;
case SIMULCRYPT_MIN_CP_DURATION:
/* convert value to ms (in units 100 ms) */
pvaluedec = tvb_get_ntohs(tvb, offset); /* read 2 byte min CP duration value */
pvaluedec = pvaluedec*100; /* in ms now */
simulcrypt_item = proto_tree_add_item( simulcrypt_parameter_tree, hf_simulcrypt_min_cp_duration, tvb, offset, plen, FALSE);
proto_item_append_text(simulcrypt_item, " (%d ms)",pvaluedec);
break;
case SIMULCRYPT_LEAD_CW:
simulcrypt_item = proto_tree_add_item( simulcrypt_parameter_tree, hf_simulcrypt_lead_cw, tvb, offset, plen, FALSE);
break;
case SIMULCRYPT_CW_PER_MESSAGE:
simulcrypt_item = proto_tree_add_item( simulcrypt_parameter_tree, hf_simulcrypt_cw_per_msg, tvb, offset, plen, FALSE);
break;
case SIMULCRYPT_MAX_COMP_TIME:
simulcrypt_item = proto_tree_add_item( simulcrypt_parameter_tree, hf_simulcrypt_max_comp_time, tvb, offset, plen, FALSE);
proto_item_append_text(simulcrypt_item, " ms");
break;
case SIMULCRYPT_ACCESS_CRITERIA:
simulcrypt_item = proto_tree_add_item( simulcrypt_parameter_tree, hf_simulcrypt_access_criteria, tvb, offset, plen, FALSE);
break;
case SIMULCRYPT_ECM_STREAM_ID:
simulcrypt_item = proto_tree_add_item( simulcrypt_parameter_tree, hf_simulcrypt_ecm_stream_id, tvb, offset, plen, FALSE);
break;
case SIMULCRYPT_NOMINAL_CP_DURATION:
/* convert value to ms (in units 100 ms) */
pvaluedec = tvb_get_ntohs(tvb, offset); /* read 2 byte nominal CP duration value */
pvaluedec = pvaluedec*100; /* in ms now */
simulcrypt_item = proto_tree_add_item( simulcrypt_parameter_tree, hf_simulcrypt_nominal_cp_duration, tvb, offset, plen, FALSE);
proto_item_append_text(simulcrypt_item, " (%d ms)", pvaluedec);
break;
case SIMULCRYPT_ACCESS_CRITERIA_TRANSFER_MODE:
simulcrypt_item = proto_tree_add_item( simulcrypt_parameter_tree, hf_simulcrypt_access_criteria_transfer_mode, tvb, offset, plen, FALSE);
break;
case SIMULCRYPT_CP_NUMBER:
simulcrypt_item = proto_tree_add_item( simulcrypt_parameter_tree, hf_simulcrypt_cp_number, tvb, offset, plen, FALSE);
break;
case SIMULCRYPT_CP_DURATION:
/* convert value to ms (in units 100 ms) */
pvaluedec = tvb_get_ntohs(tvb, offset); /* read 2 byte CP duration value */
pvaluedec = pvaluedec*100; /* in ms now */
simulcrypt_item = proto_tree_add_item( simulcrypt_parameter_tree, hf_simulcrypt_cp_duration, tvb, offset, plen, FALSE);
proto_item_append_text(simulcrypt_item, " (%d ms)", pvaluedec);
break;
case SIMULCRYPT_CP_CW_COMBINATION:
simulcrypt_item = proto_tree_add_item( simulcrypt_parameter_tree, hf_simulcrypt_cp_cw_combination, tvb, offset, plen, FALSE);
break;
case SIMULCRYPT_ECM_DATAGRAM:
simulcrypt_item = proto_tree_add_item( simulcrypt_parameter_tree, hf_simulcrypt_ecm_datagram, tvb, offset, plen, FALSE);
/* Test srcport against table of ECMG ports & CA_System_ID for known protocol types */
for(i=0;i<ECM_INTERPRETATION_SIZE;i++)
{
if(tab_ecm_inter[i].ecmg_port==pinfo->srcport) /* ECMG source port */
{ /* recognise port & ca_system_id and hence protocol name for ECM datagram */
next_tvb = tvb_new_subset(tvb, offset, -1, -1);
simulcrypt_ecm_datagram_tree = proto_item_add_subtree(simulcrypt_item, ett_simulcrypt_ecm_datagram);
if(tab_ecm_inter[i].protocol_handle != NULL)
{
call_dissector(tab_ecm_inter[i].protocol_handle, next_tvb,pinfo, simulcrypt_ecm_datagram_tree);
}
break;
}
}
break;
case SIMULCRYPT_CW_ENCRYPTION:
simulcrypt_item = proto_tree_add_item( simulcrypt_parameter_tree, hf_simulcrypt_cw_encryption, tvb, offset, plen, FALSE);
break;
case SIMULCRYPT_ECM_ID:
simulcrypt_item=proto_tree_add_item( simulcrypt_parameter_tree, hf_simulcrypt_ecm_id, tvb, offset, plen, FALSE);
break;
case SIMULCRYPT_ERROR_STATUS:
simulcrypt_item=proto_tree_add_item( simulcrypt_parameter_tree, hf_simulcrypt_error_status, tvb, offset, plen, FALSE);
break;
case SIMULCRYPT_ERROR_INFORMATION:
simulcrypt_item=proto_tree_add_item( simulcrypt_parameter_tree, hf_simulcrypt_error_information, tvb, offset, plen, FALSE);
break;
default: /* Unknown parameter type */
simulcrypt_item = proto_tree_add_text( simulcrypt_parameter_tree, tvb, offset, plen,
"Parameter Value: %s", pvalue_char);
break;
} /* end parameter type switch */
offset += plen;
} /* end parameter tree details */
} /* end tree */
}
/* determine PDU length of protocol foo */
static guint get_simulcrypt_message_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset)
{
guint iLg;
iLg = tvb_get_ntohs(tvb,offset+3); /*length is at offset 3 */
iLg += 5; /* add 1 byte version + 2 byte type + 2 byte length (simulcrypt "header" */
return iLg;
}
/* Clean out the ecm_interpretation port association whenever */
/* making a pass through a capture file to dissect all its packets */
/* (e.g., reading in a new capture file, changing a simulcrypt pref, */
/* or running a "filter packets" or "colorize packets" pass over the */
/* current capture file. */
static void
simulcrypt_init(void)
{
guint i;
for(i=0;i<ECM_INTERPRETATION_SIZE;i++)
{
tab_ecm_inter[i].ecmg_port = -1;
}
}
void proto_reg_handoff_simulcrypt(void);
void proto_register_simulcrypt (void)
{
/* A header field is something you can search/filter on.
*
* We create a structure to register our fields. It consists of an
* array of hf_register_info structures, each of which are of the format
* {&(field id), {name, abbrev, type, display, strings, bitmask, blurb, HFILL}}.
*/
static hf_register_info hf[] =
{
{ &hf_simulcrypt_header,
{ "Header", "simulcrypt.header", FT_NONE, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_simulcrypt_version,
{ "Version", "simulcrypt.version", FT_UINT8, BASE_HEX, NULL, 0x0, /* version 1 byte */
NULL, HFILL }},
{ &hf_simulcrypt_message_type,
{ "Message Type", "simulcrypt.message.type", FT_UINT16, BASE_HEX, VALS(messagetypenames), 0x0, /* type 2 bytes */
NULL, HFILL }},
{ &hf_simulcrypt_message_length,
{ "Message Length", "simulcrypt.message.len", FT_UINT16, BASE_DEC, NULL, 0x0, /* length 2 bytes, print as decimal value */
NULL, HFILL }},
{ &hf_simulcrypt_message,
{ "Message", "simulcrypt.message", FT_NONE, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_simulcrypt_parameter,
{ "Parameter", "simulcrypt.parameter", FT_NONE, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_simulcrypt_parameter_type,
{ "Parameter Type", "simulcrypt.parameter.type", FT_UINT16, BASE_HEX, VALS(parametertypenames), 0x0, /* type 2 bytes */
NULL, HFILL }},
{ &hf_simulcrypt_parameter_length,
{ "Parameter Length", "simulcrypt.parameter.len", FT_UINT16, BASE_DEC, NULL, 0x0, /* length 2 bytes, print as decimal value */
NULL, HFILL }},
{ &hf_simulcrypt_ca_system_id,
{ "CA System ID", "simulcrypt.parameter.ca_system_id", FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_simulcrypt_ca_subsystem_id,
{ "CA Subsystem ID", "simulcrypt.parameter.ca_subsystem_id", FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_simulcrypt_super_cas_id,
{ "SuperCAS ID", "simulcrypt.super_cas_id", FT_UINT32, BASE_HEX, NULL, 0x0,
NULL, HFILL }},
{ &hf_simulcrypt_section_tspkt_flag,
{ "Section TS pkt flag", "simulcrypt.section_tspkt_flag", FT_UINT8, BASE_HEX, NULL, 0x0,
NULL, HFILL }},
{ &hf_simulcrypt_ecm_channel_id,
{ "ECM channel ID", "simulcrypt.ecm_channel_id", FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_simulcrypt_delay_start,
{ "Delay start", "simulcrypt.delay_start", FT_INT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_simulcrypt_delay_stop,
{ "Delay stop", "simulcrypt.delay_stop", FT_INT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_simulcrypt_ac_delay_start,
{ "AC delay start", "simulcrypt.ac_delay_start", FT_INT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_simulcrypt_ac_delay_stop,
{ "AC delay stop", "simulcrypt.ac_delay_stop", FT_INT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_simulcrypt_transition_delay_start,
{ "Transition delay start", "simulcrypt.transition_delay_start", FT_INT16, BASE_DEC, NULL, 0x0,
"Transition delay start", HFILL }},
{ &hf_simulcrypt_transition_delay_stop,
{ "Transition delay stop", "simulcrypt.transition_delay_stop", FT_INT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_simulcrypt_ecm_rep_period,
{ "ECM repetition period", "simulcrypt.ecm_rep_period", FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_simulcrypt_max_streams,
{ "Max streams", "simulcrypt.max_streams", FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_simulcrypt_min_cp_duration,
{ "Min CP duration", "simulcrypt.min_cp_duration", FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_simulcrypt_lead_cw,
{ "Lead CW", "simulcrypt.lead_cw", FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_simulcrypt_cw_per_msg,
{ "CW per msg", "simulcrypt.cw_per_msg", FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_simulcrypt_max_comp_time,
{ "Max comp time", "simulcrypt.max_comp_time", FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_simulcrypt_access_criteria,
{ "Access criteria", "simulcrypt.access_criteria", FT_BYTES, BASE_HEX, NULL, 0x0,
NULL, HFILL }},
{ &hf_simulcrypt_ecm_stream_id,
{ "ECM stream ID", "simulcrypt.ecm_stream_id", FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_simulcrypt_nominal_cp_duration,
{ "Nominal CP duration", "simulcrypt.nominal_cp_duration", FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_simulcrypt_access_criteria_transfer_mode,
{ "AC transfer mode", "simulcrypt.access_criteria_transfer_mode", FT_BOOLEAN, 8, NULL, 0x0,
NULL, HFILL }},
{ &hf_simulcrypt_cp_number,
{ "CP number", "simulcrypt.cp_number", FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_simulcrypt_cp_duration,
{ "CP duration", "simulcrypt.cp_duration", FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_simulcrypt_cp_cw_combination,
{ "CP CW combination", "simulcrypt.cp_cw_combination", FT_BYTES, BASE_HEX, NULL, 0x0,
NULL, HFILL }},
{ &hf_simulcrypt_ecm_datagram,
{ "ECM datagram", "simulcrypt.ecm_datagram", FT_BYTES, BASE_HEX, NULL, 0x0,
NULL, HFILL }},
{ &hf_simulcrypt_cw_encryption,
{ "CW encryption", "simulcrypt.cw_encryption", FT_NONE, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_simulcrypt_ecm_id,
{ "ECM ID", "simulcrypt.ecm_id", FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_simulcrypt_error_status,
{ "Error status", "simulcrypt.error_status", FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_simulcrypt_error_information,
{ "Error information", "simulcrypt.error_information", FT_NONE, BASE_NONE, NULL, 0x0,
NULL, HFILL }}
};
static gint *ett[] =
{
&ett_simulcrypt,
&ett_simulcrypt_header,
&ett_simulcrypt_message,
&ett_simulcrypt_parameter,
&ett_simulcrypt_super_cas_id,
&ett_simulcrypt_ecm_datagram
};
module_t *simulcrypt_module;
/* execute protocol initialization only once */
proto_simulcrypt = proto_register_protocol ("SIMULCRYPT Protocol", "SIMULCRYPT", "simulcrypt");
proto_register_field_array (proto_simulcrypt, hf, array_length (hf));
proto_register_subtree_array (ett, array_length (ett));
register_init_routine(simulcrypt_init);
/* Register our configuration options for Simulcrypt, particularly our port. */
/* This registers our preferences; function proto_reg_handoff_simulcrypt is */
/* called when preferences are applied. */
simulcrypt_module = prefs_register_protocol(proto_simulcrypt, proto_reg_handoff_simulcrypt);
prefs_register_uint_preference(simulcrypt_module, "tcp.port", "Simulcrypt TCP Port",
"Set the port for Simulcrypt messages ('0' means no port is assigned)",
10, &global_simulcrypt_tcp_port);
prefs_register_uint_preference(simulcrypt_module, "ca_system_id_mikey","MIKEY ECM CA_system_ID 0x (hex value)",
"Set the CA_system_ID used to decode ECM datagram as MIKEY", 16, &ca_system_id_mikey);
}
/* this is run every time preferences are changed and also during Wireshark initialization */
void proto_reg_handoff_simulcrypt(void)
{
static gboolean initialized=FALSE;
static dissector_handle_t simulcrypt_handle;
static guint tcp_port;
guint i;
if (!initialized) {
simulcrypt_handle = create_dissector_handle( dissect_simulcrypt, proto_simulcrypt);
for(i=0;i<ECM_INTERPRETATION_SIZE;i++)
{
tab_ecm_inter[i].protocol_handle = find_dissector(tab_ecm_inter[i].protocol_name);
}
initialized = TRUE;
}
else {
if (tcp_port != 0) {
dissector_delete("tcp.port", tcp_port, simulcrypt_handle);
}
}
if (global_simulcrypt_tcp_port != 0) {
dissector_add("tcp.port", global_simulcrypt_tcp_port, simulcrypt_handle);
}
tcp_port = global_simulcrypt_tcp_port;
/* update tab_ecm_inter table (always do this) */
tab_ecm_inter[ECM_MIKEY_INDEX].ca_system_id=ca_system_id_mikey;
}
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