![Bill Meier](/assets/img/avatar_default.png)
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=5654 svn path=/trunk/; revision=36163
1548 lines
52 KiB
C
1548 lines
52 KiB
C
/* packet-dvbci.c
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* Routines for DVB-CI (Common Inteface) dissection
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* Copyright 2011, Martin Kaiser <martin@kaiser.cx>
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/* the dissector supports DVB-CI as defined in EN50221
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* reassembly of fragmented data is not implemented yet
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* only resource manager, app info and ca resources are
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* supported at the moment
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*
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* further resources and CI+ (www.ci-plus.com) will be added in
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* future versions
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*
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* the pcap input format for this dissector is documented at
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* http://www.kaiser.cx/pcap-dvbci.html
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/prefs.h>
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#include <epan/expert.h>
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#include "packet-ber.h"
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/* event byte in the pseudo-header */
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#define DATA_CAM_TO_HOST 0xFF
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#define DATA_HOST_TO_CAM 0xFE
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#define CIS_READ 0xFD
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#define COR_WRITE 0xFC
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#define HW_EVT 0xFB
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#define IS_DATA_TRANSFER(e) (e==DATA_CAM_TO_HOST || e==DATA_HOST_TO_CAM)
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/* for [as]pdu_info_t when the message is allowed in either direction */
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#define DIRECTION_ANY 0x0
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/* source/destination address field */
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#define ADDR_HOST "Host"
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#define ADDR_CAM "CAM"
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/* hardware event */
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#define CAM_IN 0x01
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#define CAM_OUT 0x02
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#define POWER_ON 0x03
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#define POWER_OFF 0x04
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#define TS_ROUTE 0x05
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#define TS_BYPASS 0x06
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#define RESET_H 0x07
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#define RESET_L 0x08
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#define READY_H 0x09
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#define READY_L 0x0A
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/* link layer */
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#define ML_MORE 0x80
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#define ML_LAST 0x00
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/* transport layer */
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#define NO_TAG 0x00
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#define T_SB 0x80
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#define T_RCV 0x81
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#define T_CREATE_T_C 0x82
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#define T_C_T_C_REPLY 0x83
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#define T_DELETE_T_C 0x84
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#define T_D_T_C_REPLY 0x85
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#define T_REQUEST_T_C 0x86
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#define T_NEW_T_C 0x87
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#define T_T_C_ERROR 0x88
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#define T_DATA_LAST 0xA0
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#define T_DATA_MORE 0xA1
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#define SB_VAL_MSG_AVAILABLE 0x80
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#define SB_VAL_NO_MSG_AVAILABLE 0x00
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/* session layer */
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#define T_SESSION_NUMBER 0x90
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#define T_OPEN_SESSION_REQUEST 0x91
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#define T_OPEN_SESSION_RESPONSE 0x92
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#define T_CREATE_SESSION 0x93
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#define T_CREATE_SESSION_RESPONSE 0x94
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#define T_CLOSE_SESSION_REQUEST 0x95
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#define T_CLOSE_SESSION_RESPONSE 0x96
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/* status for open/create session */
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#define SESS_OPENED 0x00
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#define SESS_NOT_OPENED_RES_NON_EXIST 0xF0
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#define SESS_NOT_OPENED_RES_UNAVAIL 0xF1
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#define SESS_NOT_OPENED_RES_VER_LOWER 0xF2
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#define SESS_NOT_OPENED_RES_BUSY 0xF3
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/* status for close session */
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#define SESS_CLOSED 0x00
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#define SESS_NB_NOT_ALLOC 0xF0
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/* resource id */
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#define RES_ID_TYPE_MASK 0xC0000000
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#define RES_CLASS_MASK 0x3FFF0000
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#define RES_TYPE_MASK 0x0000FFC0
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#define RES_VER_MASK 0x0000003F
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/* resource class */
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#define RES_CLASS_RM 0x01
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#define RES_CLASS_AP 0x02
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#define RES_CLASS_CA 0x03
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#define RES_CLASS_HC 0x20
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#define RES_CLASS_DT 0x24
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#define RES_CLASS_MMI 0x40
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#define RES_CLASS_LSC 0x60
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#define RES_ID_LEN 4 /* bytes */
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#define RES_CLASS(_res_id) (_res_id & RES_CLASS_MASK) >> 16
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#define RES_VER(_res_id) (_res_id & RES_VER_MASK)
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/* appinfo resource */
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#define APP_TYPE_CA 0x1
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#define APP_TYPE_EPG 0x2
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/* ca resource */
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#define LIST_MGMT_MORE 0x0
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#define LIST_MGMT_FIRST 0x1
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#define LIST_MGMT_LAST 0x2
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#define LIST_MGMT_ONLY 0x3
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#define LIST_MGMT_ADD 0x4
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#define LIST_MGMT_UPDATE 0x5
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#define CMD_ID_OK_DESCR 0x1
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#define CMD_ID_OK_MMI 0x2
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#define CMD_ID_QUERY 0x3
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#define CMD_ID_NOT_SELECTED 0x4
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#define CA_DESC_TAG 0x9
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/* application layer */
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#define APDU_TAG_SIZE 3
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/* "don't care" value for min_len_field and len_field (this can't be 0) */
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#define LEN_FIELD_ANY G_MAXUINT32
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static GHashTable *apdu_table = NULL;
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typedef struct _apdu_info_t {
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guint32 tag;
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/* the minimum length required for this apdu */
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guint32 min_len_field;
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/* if the apdu has a well-known length, we enforce it here
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* (otherwise, we set this to LEN_FIELD_ANY) */
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guint32 len_field;
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guint8 direction;
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void (*dissect_payload)(guint32, gint,
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tvbuff_t *, gint, packet_info *, proto_tree *);
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} apdu_info_t;
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static void
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dissect_dvbci_payload_rm(guint32 tag, gint len_field,
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tvbuff_t *tvb, gint offset, packet_info *pinfo,
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proto_tree *tree);
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static void
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dissect_dvbci_payload_ap(guint32 tag, gint len_field,
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tvbuff_t *tvb, gint offset, packet_info *pinfo,
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proto_tree *tree);
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static void
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dissect_dvbci_payload_ca(guint32 tag, gint len_field,
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tvbuff_t *tvb, gint offset, packet_info *pinfo,
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proto_tree *tree);
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/* apdu defines */
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#define T_PROFILE_ENQ 0x9F8010
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#define T_PROFILE 0x9F8011
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#define T_PROFILE_CHANGE 0x9F8012
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#define T_APP_INFO_ENQ 0x9F8020
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#define T_APP_INFO 0x9F8021
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#define T_ENTER_MENU 0x9F8022
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#define T_CA_INFO_ENQ 0x9F8030
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#define T_CA_INFO 0x9F8031
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#define T_CA_PMT 0x9F8032
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/* the following apdus are recognized but not dissected in the 1st release */
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#define T_CA_PMT_REPLY 0x9F8033
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#define T_CLOSE_MMI 0x9F8800
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#define T_DISPLAY_CONTROL 0x9F8801
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#define T_DISPLAY_REPLY 0x9F8802
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#define T_TEXT_LAST 0x9F8803
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#define T_TEXT_MORE 0x9F8804
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#define T_ENQ 0x9F8807
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#define T_ANSW 0x9F8808
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#define T_MENU_LAST 0x9F8809
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#define T_MENU_MORE 0x9F880A
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#define T_MENU_ANSW 0x9F880B
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#define T_LIST_LAST 0x9F880C
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#define T_LIST_MORE 0x9F880D
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static const apdu_info_t apdu_info[] = {
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{T_PROFILE_ENQ, 0, 0, DIRECTION_ANY, NULL},
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{T_PROFILE, 0, LEN_FIELD_ANY, DIRECTION_ANY, dissect_dvbci_payload_rm},
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{T_PROFILE_CHANGE, 0, 0, DIRECTION_ANY, NULL},
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{T_APP_INFO_ENQ, 0, 0, DATA_HOST_TO_CAM, NULL},
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{T_APP_INFO, 6, LEN_FIELD_ANY, DATA_CAM_TO_HOST, dissect_dvbci_payload_ap},
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{T_ENTER_MENU, 0, 0, DATA_HOST_TO_CAM, NULL},
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{T_CA_INFO_ENQ, 0, 0, DATA_HOST_TO_CAM, NULL},
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{T_CA_INFO, 0, LEN_FIELD_ANY, DATA_CAM_TO_HOST, dissect_dvbci_payload_ca},
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{T_CA_PMT, 6, LEN_FIELD_ANY, DATA_HOST_TO_CAM, dissect_dvbci_payload_ca}
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};
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static const value_string dvbci_apdu_tag[] = {
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{ T_PROFILE_ENQ, "Profile enquiry" },
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{ T_PROFILE, "Profile information" },
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{ T_PROFILE_CHANGE, "Profile change notification" },
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{ T_APP_INFO_ENQ, "Application info enquiry" },
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{ T_APP_INFO, "Application info" },
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{ T_ENTER_MENU, "Enter menu" },
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{ T_CA_INFO_ENQ, "CA info enquiry" },
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{ T_CA_INFO, "CA info" },
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{ T_CA_PMT, "CA PMT" },
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{ T_CA_PMT_REPLY, "CA PMT reply" },
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{ T_CLOSE_MMI, "Close MMI" },
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{ T_DISPLAY_CONTROL, "Display control" },
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{ T_DISPLAY_REPLY, "Display reply" },
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{ T_TEXT_LAST, "Text last" },
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{ T_TEXT_MORE, "Text more" },
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{ T_ENQ, "Enquiry" },
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{ T_ANSW, "Answer" },
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{ T_MENU_LAST, "Menu last" },
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{ T_MENU_MORE, "Menu more" },
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{ T_MENU_ANSW, "Menu answer" },
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{ T_LIST_LAST, "List last" },
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{ T_LIST_MORE, "List more" },
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{ 0, NULL }
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};
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void proto_reg_handoff_dvbci(void);
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static int proto_dvbci = -1;
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static gint ett_dvbci = -1;
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static gint ett_dvbci_link = -1;
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static gint ett_dvbci_transport = -1;
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static gint ett_dvbci_session = -1;
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static gint ett_dvbci_res = -1;
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static gint ett_dvbci_application = -1;
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static gint ett_dvbci_es = -1;
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static gint ett_dvbci_ca_desc = -1;
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static int hf_dvbci_hw_event = -1;
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static int hf_dvbci_buf_size = -1;
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static int hf_dvbci_tcid = -1;
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static int hf_dvbci_ml = -1;
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static int hf_dvbci_c_tpdu_tag = -1;
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static int hf_dvbci_r_tpdu_tag = -1;
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static int hf_dvbci_t_c_id = -1;
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static int hf_dvbci_sb_value = -1;
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static int hf_dvbci_spdu_tag = -1;
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static int hf_dvbci_sess_status = -1;
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static int hf_dvbci_sess_nb = -1;
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static int hf_dvbci_close_sess_status = -1;
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static int hf_dvbci_apdu_tag = -1;
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static int hf_dvbci_app_type = -1;
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static int hf_dvbci_app_manf = -1;
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static int hf_dvbci_manf_code = -1;
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static int hf_dvbci_menu_str_len = -1;
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static int hf_dvbci_ca_sys_id = -1;
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static int hf_dvbci_ca_pmt_list_mgmt = -1;
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static int hf_dvbci_prog_num = -1;
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static int hf_dvbci_ver_cn_ind = -1;
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static int hf_dvbci_prog_info_len = -1;
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static int hf_dvbci_stream_type = -1;
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static int hf_dvbci_es_pid = -1;
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static int hf_dvbci_es_info_len = -1;
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static int hf_dvbci_ca_pmt_cmd_id = -1;
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static int hf_dvbci_descr_len = -1;
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static int hf_dvbci_ca_pid = -1;
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typedef struct _spdu_info_t {
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guint8 tag;
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guint8 direction;
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guint8 len_field;
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} spdu_info_t;
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static const value_string dvbci_event[] = {
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{ DATA_HOST_TO_CAM, "data transfer Host -> CAM" },
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{ DATA_CAM_TO_HOST, "data transfer CAM -> Host" },
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{ CIS_READ, "read the Card Information Structure (CIS)" },
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{ COR_WRITE, "write into the Configuration Option Register (COR)" },
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{ HW_EVT, "hardware event" },
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{ 0, NULL }
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};
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static const value_string dvbci_hw_event[] = {
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{ CAM_IN, "CI Module is inserted" },
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{ CAM_OUT, "CI Module is removed" },
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{ POWER_ON, "CI slot power on" },
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{ POWER_OFF, "CI slot power off" },
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{ TS_ROUTE, "Transport stream routed through the CI Module" },
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{ TS_BYPASS, "Transport stream bypasses the CI Module" },
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{ RESET_H, "Reset pin is high" },
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{ RESET_L, "Reset pin is low" },
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{ READY_H, "Ready pin is high" },
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{ READY_L, "Ready pin is low" },
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{ 0, NULL }
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};
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static const value_string dvbci_ml[] = {
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{ ML_MORE, "more TPDU fragments pending" },
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{ ML_LAST, "last TPDU fragment" },
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{ 0, NULL }
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};
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static const value_string dvbci_c_tpdu[] = {
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{ T_RCV, "T_RCV" },
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{ T_CREATE_T_C, "T_create_t_c" },
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{ T_DELETE_T_C, "T_delete_t_c" },
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{ T_D_T_C_REPLY, "T_d_t_c_reply" },
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{ T_NEW_T_C, "T_new_t_c" },
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{ T_T_C_ERROR, "T_t_c_error" },
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{ T_DATA_LAST, "T_data_last" },
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{ T_DATA_MORE, "T_data_more" },
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{ 0, NULL }
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};
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static const value_string dvbci_r_tpdu[] = {
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{ T_C_T_C_REPLY, "T_c_tc_reply" },
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{ T_DELETE_T_C, "T_delete_t_c" },
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{ T_D_T_C_REPLY, "T_d_t_c_reply" },
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{ T_REQUEST_T_C, "T_request_t_c" },
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{ T_DATA_LAST, "T_data_last" },
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{ T_DATA_MORE, "T_data_more" },
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{ 0, NULL }
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};
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static const value_string dvbci_sb_value[] = {
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{ SB_VAL_MSG_AVAILABLE, "message available" },
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{ SB_VAL_NO_MSG_AVAILABLE, "no message available" },
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{ 0, NULL }
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};
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static const value_string dvbci_spdu_tag[] = {
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{ T_SESSION_NUMBER, "Session Number (payload data)" },
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{ T_OPEN_SESSION_REQUEST, "Open Session Request" },
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{ T_OPEN_SESSION_RESPONSE, "Open Session Response" },
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{ T_CREATE_SESSION, "Create Session" },
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{ T_CREATE_SESSION_RESPONSE, "Create Session Response" },
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{ T_CLOSE_SESSION_REQUEST, "Close Session Request" },
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{ T_CLOSE_SESSION_RESPONSE, "Close Session Response" },
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{ 0, NULL }
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};
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static GHashTable *spdu_table = NULL;
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static const spdu_info_t spdu_info[] = {
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{ T_SESSION_NUMBER, DIRECTION_ANY, 2 },
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{ T_OPEN_SESSION_REQUEST, DATA_CAM_TO_HOST, 4 },
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{ T_OPEN_SESSION_RESPONSE, DATA_HOST_TO_CAM, 7 },
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{ T_CREATE_SESSION, DATA_HOST_TO_CAM, 6 },
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{ T_CREATE_SESSION_RESPONSE, DATA_CAM_TO_HOST, 7 },
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{ T_CLOSE_SESSION_REQUEST, DIRECTION_ANY, 2 },
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{ T_CLOSE_SESSION_RESPONSE, DIRECTION_ANY, 3 }
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};
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static const value_string dvbci_sess_status[] = {
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{ SESS_OPENED,
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"Session opened" },
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{ SESS_NOT_OPENED_RES_NON_EXIST,
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"Resource does not exist" },
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{ SESS_NOT_OPENED_RES_UNAVAIL,
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"Resource exists but it's unavailable" },
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{ SESS_NOT_OPENED_RES_VER_LOWER,
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"Existing resource's version is lower than requested version" },
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{ SESS_NOT_OPENED_RES_BUSY,
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"Resource is busy" },
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{ 0, NULL }
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};
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static const value_string dvbci_close_sess_status[] = {
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{ SESS_CLOSED, "Session closed" },
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{ SESS_NB_NOT_ALLOC, "Session number not allocated" },
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{ 0, NULL }
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};
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static const value_string dvbci_res_class[] = {
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{ RES_CLASS_RM, "Resource Manager" },
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{ RES_CLASS_AP, "Application Info" },
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{ RES_CLASS_CA, "Conditional Access" },
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{ RES_CLASS_HC, "Host Control" },
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{ RES_CLASS_DT, "Date-Time" },
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{ RES_CLASS_MMI, "Man-machine interface (MMI)" },
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{ RES_CLASS_LSC, "Low-Speed Communications" },
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{ 0, NULL }
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};
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static const value_string dvbci_app_type[] = {
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{ APP_TYPE_CA, "Conditional Access" },
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{ APP_TYPE_EPG, "Electronic Progam Guide" },
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{ 0, NULL }
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};
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static const value_string dvbci_ca_pmt_list_mgmt[] = {
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{ LIST_MGMT_MORE, "more" },
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{ LIST_MGMT_FIRST, "first" },
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{ LIST_MGMT_LAST, "last" },
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{ LIST_MGMT_ONLY, "only" },
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{ LIST_MGMT_ADD, "add" },
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{ LIST_MGMT_UPDATE, "update" },
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{ 0, NULL }
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};
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static const value_string dvbci_ca_pmt_cmd_id[] = {
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{ CMD_ID_OK_DESCR, "ok descrambling" },
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{ CMD_ID_OK_MMI, "ok mmi" },
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{ CMD_ID_QUERY, "query" },
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{ CMD_ID_NOT_SELECTED, "not selected" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
|
|
static guint16 buf_size_cam; /* buffer size proposal by the CAM */
|
|
/* buffer size proposal by the host == negotiated buffer size */
|
|
static guint16 buf_size_host;
|
|
|
|
|
|
|
|
/* initialize/reset per capture state data */
|
|
static void
|
|
dvbci_init(void)
|
|
{
|
|
buf_size_cam = 0;
|
|
buf_size_host = 0;
|
|
}
|
|
|
|
/* dissect a ca descriptor in the ca_pmt */
|
|
static gint
|
|
dissect_ca_desc(tvbuff_t *tvb, gint offset, packet_info *pinfo,
|
|
proto_tree *tree)
|
|
{
|
|
gint offset_start;
|
|
proto_item *pi;
|
|
guint8 tag, len_byte;
|
|
proto_item *ti = NULL;
|
|
proto_tree *ca_desc_tree = NULL;
|
|
|
|
offset_start = offset;
|
|
|
|
tag = tvb_get_guint8(tvb,offset);
|
|
if (tag != CA_DESC_TAG) {
|
|
/* we could skip unknown descriptors and make this a warning */
|
|
pi = proto_tree_add_text(tree, tvb, offset, 1, "Invalid descriptor");
|
|
expert_add_info_format(pinfo, pi, PI_MALFORMED, PI_ERROR,
|
|
"The ca_pmt shall only contain ca descriptors (tag 0x9)");
|
|
return 0;
|
|
}
|
|
if (tree) {
|
|
ti = proto_tree_add_text(
|
|
tree, tvb, offset_start, -1, "Conditional Access descriptor");
|
|
ca_desc_tree = proto_item_add_subtree(ti, ett_dvbci_ca_desc);
|
|
}
|
|
offset++;
|
|
|
|
len_byte = tvb_get_guint8(tvb,offset);
|
|
proto_tree_add_item(
|
|
ca_desc_tree, hf_dvbci_descr_len, tvb, offset, 1, ENC_NA);
|
|
offset++;
|
|
|
|
proto_tree_add_item(
|
|
ca_desc_tree, hf_dvbci_ca_sys_id, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
|
|
proto_tree_add_item(
|
|
ca_desc_tree, hf_dvbci_ca_pid, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
|
|
if ((len_byte-4) != 0) {
|
|
proto_tree_add_text(
|
|
ca_desc_tree, tvb, offset, len_byte-4, "private data");
|
|
offset += (len_byte-4);
|
|
}
|
|
|
|
if (ti)
|
|
proto_item_set_len(ti, offset-offset_start);
|
|
return offset-offset_start;
|
|
}
|
|
|
|
|
|
/* dissect an elementary stream entry in the ca_pmt */
|
|
static gint
|
|
dissect_es(tvbuff_t *tvb, gint offset, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
proto_item *ti = NULL;
|
|
proto_tree *es_tree = NULL;
|
|
gint offset_start, ca_desc_len;
|
|
gint es_info_len, all_len;
|
|
|
|
offset_start = offset;
|
|
|
|
if (tree) {
|
|
ti = proto_tree_add_text(
|
|
tree, tvb, offset_start, -1, "Elementary Stream");
|
|
es_tree = proto_item_add_subtree(ti, ett_dvbci_application);
|
|
}
|
|
|
|
proto_tree_add_item(
|
|
es_tree, hf_dvbci_stream_type, tvb, offset, 1, ENC_NA);
|
|
offset++;
|
|
proto_tree_add_item(
|
|
es_tree, hf_dvbci_es_pid, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
es_info_len = tvb_get_ntohs(tvb, offset) & 0x0FFF;
|
|
/* the definition of hf_dvbci_es_info_len also applies the mask */
|
|
proto_tree_add_item(
|
|
es_tree, hf_dvbci_es_info_len, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
if (es_info_len != 0) {
|
|
all_len = offset + es_info_len;
|
|
|
|
proto_tree_add_item(
|
|
es_tree, hf_dvbci_ca_pmt_cmd_id, tvb, offset, 1, ENC_NA);
|
|
offset++;
|
|
while (offset < all_len) {
|
|
ca_desc_len = dissect_ca_desc(tvb, offset, pinfo, es_tree);
|
|
if (ca_desc_len <= 0)
|
|
return -1;
|
|
offset += ca_desc_len;
|
|
}
|
|
}
|
|
else {
|
|
proto_tree_add_text(
|
|
es_tree, tvb, 0, 0,
|
|
"No CA descriptors for this elementary stream");
|
|
}
|
|
|
|
if (ti)
|
|
proto_item_set_len(ti, offset-offset_start);
|
|
return offset-offset_start;
|
|
}
|
|
|
|
|
|
static void
|
|
dissect_dvbci_res_id(tvbuff_t *tvb, gint offset,
|
|
packet_info *pinfo, proto_tree *tree, guint32 res_id,
|
|
gboolean show_col_info)
|
|
{
|
|
proto_item *ti = NULL;
|
|
proto_tree *res_tree = NULL;
|
|
|
|
if (show_col_info) {
|
|
col_append_sep_fstr(pinfo->cinfo, COL_INFO, NULL, "%s Version %d",
|
|
val_to_str_const(RES_CLASS(res_id), dvbci_res_class,
|
|
"Invalid Resource class"),
|
|
RES_VER(res_id));
|
|
}
|
|
|
|
if (tree) {
|
|
ti = proto_tree_add_text(
|
|
tree, tvb, offset, RES_ID_LEN, "Resource ID: 0x%04x", res_id);
|
|
|
|
res_tree = proto_item_add_subtree(ti, ett_dvbci_res);
|
|
|
|
proto_tree_add_text(res_tree, tvb, 0, 0, "%s",
|
|
decode_numeric_bitfield(res_id, RES_ID_TYPE_MASK, 32,
|
|
"Resource ID Type: 0x%x"));
|
|
proto_tree_add_text(res_tree, tvb, 0, 0, "%s",
|
|
decode_enumerated_bitfield_shifted(res_id, RES_CLASS_MASK, 32,
|
|
dvbci_res_class, "Resource Class: %s"));
|
|
proto_tree_add_text(res_tree, tvb, 0, 0, "%s",
|
|
decode_numeric_bitfield(res_id, RES_TYPE_MASK, 32,
|
|
"Resource Type: 0x%x"));
|
|
proto_tree_add_text(res_tree, tvb, 0, 0, "%s",
|
|
decode_numeric_bitfield(res_id, RES_VER_MASK, 32,
|
|
"Resource Version: 0x%x"));
|
|
}
|
|
}
|
|
|
|
/* dissect the body of a resource manager apdu */
|
|
static void
|
|
dissect_dvbci_payload_rm(guint32 tag, gint len_field,
|
|
tvbuff_t *tvb, gint offset, packet_info *pinfo,
|
|
proto_tree *tree)
|
|
{
|
|
const gchar *tag_str;
|
|
proto_item *pi;
|
|
guint32 res_id;
|
|
|
|
if (tag==T_PROFILE) {
|
|
if (len_field % RES_ID_LEN) {
|
|
tag_str = match_strval(tag, dvbci_apdu_tag);
|
|
pi = proto_tree_add_text(tree, tvb, 0, APDU_TAG_SIZE,
|
|
"Invalid APDU length field");
|
|
expert_add_info_format(pinfo, pi, PI_MALFORMED, PI_ERROR,
|
|
"Length field for %s must be a multiple of 4 bytes",
|
|
tag_str);
|
|
return;
|
|
}
|
|
|
|
while (tvb_reported_length_remaining(tvb, offset) != 0) {
|
|
res_id = tvb_get_ntohl(tvb, offset);
|
|
dissect_dvbci_res_id(tvb, offset, pinfo, tree, res_id, FALSE);
|
|
offset += RES_ID_LEN;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
dissect_dvbci_payload_ap(guint32 tag, gint len_field,
|
|
tvbuff_t *tvb, gint offset, packet_info *pinfo,
|
|
proto_tree *tree)
|
|
{
|
|
guint8 menu_str_len;
|
|
guint8 *menu_string;
|
|
|
|
/* this parameter is unused, silence the compiler */
|
|
if (len_field==0) return;
|
|
|
|
if (tag==T_APP_INFO) {
|
|
proto_tree_add_item(tree, hf_dvbci_app_type, tvb, offset, 1, ENC_NA);
|
|
offset++;
|
|
proto_tree_add_item(
|
|
tree, hf_dvbci_app_manf, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset+=2;
|
|
proto_tree_add_item(
|
|
tree, hf_dvbci_manf_code, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset+=2;
|
|
menu_str_len = tvb_get_guint8(tvb,offset);
|
|
proto_tree_add_item(
|
|
tree, hf_dvbci_menu_str_len, tvb, offset, 1, ENC_NA);
|
|
offset++;
|
|
/* ephemeral -> string is freed automatically when dissection
|
|
of this packet is finished
|
|
tvb_get_ephemeral_string() always returns a 0-terminated string */
|
|
menu_string = tvb_get_ephemeral_string(tvb, offset, menu_str_len);
|
|
if (menu_string) {
|
|
col_append_sep_fstr(pinfo->cinfo, COL_INFO, NULL,
|
|
"Module name %s", menu_string);
|
|
proto_tree_add_text(tree, tvb, offset, menu_str_len,
|
|
"Menu string: %s", menu_string);
|
|
}
|
|
offset += menu_str_len;
|
|
}
|
|
}
|
|
|
|
static void
|
|
dissect_dvbci_payload_ca(guint32 tag, gint len_field,
|
|
tvbuff_t *tvb, gint offset, packet_info *pinfo,
|
|
proto_tree *tree)
|
|
{
|
|
const gchar *tag_str;
|
|
proto_item *pi;
|
|
guint16 prog_num;
|
|
guint8 byte;
|
|
guint prog_info_len;
|
|
gint es_info_len, all_len;
|
|
gint ca_desc_len;
|
|
|
|
|
|
if (tag==T_CA_INFO) {
|
|
if (len_field % 2) {
|
|
tag_str = match_strval(tag, dvbci_apdu_tag);
|
|
pi = proto_tree_add_text(tree, tvb, 0, APDU_TAG_SIZE,
|
|
"Invalid APDU length field");
|
|
expert_add_info_format(pinfo, pi, PI_MALFORMED, PI_ERROR,
|
|
"Length field for %s must be a multiple of 2 bytes",
|
|
tag_str);
|
|
return;
|
|
}
|
|
|
|
while (tvb_reported_length_remaining(tvb, offset) != 0) {
|
|
proto_tree_add_item(
|
|
tree, hf_dvbci_ca_sys_id, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
}
|
|
}
|
|
else if (tag==T_CA_PMT) {
|
|
proto_tree_add_item(
|
|
tree, hf_dvbci_ca_pmt_list_mgmt, tvb, offset, 1, ENC_NA);
|
|
offset++;
|
|
prog_num = tvb_get_ntohs(tvb, offset);
|
|
col_append_sep_fstr(
|
|
pinfo->cinfo, COL_INFO, NULL, "Program number %x", prog_num);
|
|
proto_tree_add_item(
|
|
tree, hf_dvbci_prog_num, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
byte = tvb_get_guint8(tvb,offset);
|
|
proto_tree_add_uint_format(tree, hf_dvbci_ver_cn_ind, tvb,
|
|
offset, 1, byte,
|
|
"Version number: 0x%x, Current-next indicator: 0x%x",
|
|
(byte&0x3E) >> 1, byte&0x01);
|
|
offset++;
|
|
prog_info_len = tvb_get_ntohs(tvb, offset) & 0x0FFF;
|
|
/* the definition of hf_dvbci_prog_info_len also applies the mask */
|
|
proto_tree_add_item(
|
|
tree, hf_dvbci_prog_info_len, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
if (prog_info_len != 0) {
|
|
all_len = offset + prog_info_len;
|
|
|
|
proto_tree_add_item(
|
|
tree, hf_dvbci_ca_pmt_cmd_id, tvb, offset, 1, ENC_NA);
|
|
offset++;
|
|
while (offset < all_len) {
|
|
ca_desc_len = dissect_ca_desc(tvb, offset, pinfo, tree);
|
|
if (ca_desc_len <= 0)
|
|
return;
|
|
offset += ca_desc_len;
|
|
}
|
|
}
|
|
else {
|
|
proto_tree_add_text(
|
|
tree, tvb, 0, 0, "No CA descriptors at program level");
|
|
}
|
|
|
|
while (tvb_reported_length_remaining(tvb, offset) > 0) {
|
|
es_info_len = dissect_es(tvb, offset, pinfo, tree);
|
|
if (es_info_len <= 0)
|
|
return;
|
|
offset += es_info_len;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
static void
|
|
dissect_dvbci_apdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
|
|
guint8 direction)
|
|
{
|
|
proto_item *ti;
|
|
proto_tree *app_tree = NULL;
|
|
guint32 apdu_len, tag, len_field;
|
|
const gchar *tag_str;
|
|
gint offset;
|
|
proto_item *pi;
|
|
apdu_info_t *ai;
|
|
|
|
|
|
apdu_len = tvb_reported_length(tvb);
|
|
|
|
if (tree) {
|
|
ti = proto_tree_add_text(tree, tvb, 0, apdu_len, "Application Layer");
|
|
app_tree = proto_item_add_subtree(ti, ett_dvbci_application);
|
|
}
|
|
|
|
tag = tvb_get_ntoh24(tvb, 0);
|
|
tag_str = match_strval(tag, dvbci_apdu_tag);
|
|
offset = APDU_TAG_SIZE;
|
|
|
|
col_set_str(pinfo->cinfo, COL_INFO,
|
|
val_to_str_const(tag, dvbci_apdu_tag, "Unknown/invalid APDU"));
|
|
if (tag_str) {
|
|
proto_tree_add_item(
|
|
app_tree, hf_dvbci_apdu_tag, tvb, 0, APDU_TAG_SIZE, ENC_NA);
|
|
}
|
|
else {
|
|
pi = proto_tree_add_text(app_tree, tvb, 0, APDU_TAG_SIZE,
|
|
"Invalid or unsupported APDU tag");
|
|
expert_add_info_format(pinfo, pi, PI_MALFORMED, PI_ERROR,
|
|
"Invalid or unsupported APDU tag");
|
|
return;
|
|
}
|
|
|
|
offset = dissect_ber_length(pinfo, app_tree, tvb, offset, &len_field, NULL);
|
|
if ((offset+len_field) > apdu_len) {
|
|
pi = proto_tree_add_text(app_tree, tvb,
|
|
APDU_TAG_SIZE, offset-APDU_TAG_SIZE,
|
|
"Length field mismatch");
|
|
expert_add_info_format(pinfo, pi, PI_MALFORMED, PI_ERROR,
|
|
"Length field mismatch");
|
|
return;
|
|
}
|
|
|
|
ai = (apdu_info_t *)g_hash_table_lookup(apdu_table,
|
|
GUINT_TO_POINTER((guint)tag));
|
|
if (!ai) {
|
|
pi = proto_tree_add_text(
|
|
app_tree, tvb, 0, APDU_TAG_SIZE, "Unknown APDU");
|
|
expert_add_info_format(pinfo, pi, PI_PROTOCOL, PI_WARN,
|
|
"Dissection of this APDU is not supported");
|
|
return;
|
|
}
|
|
if (ai->direction!=DIRECTION_ANY && ai->direction!=direction) {
|
|
pi = proto_tree_add_text(app_tree, tvb, 0, APDU_TAG_SIZE,
|
|
"Invalid APDU direction");
|
|
if (ai->direction==DATA_HOST_TO_CAM) {
|
|
expert_add_info_format(pinfo, pi, PI_PROTOCOL, PI_WARN,
|
|
"This APDU must be sent from host to CAM");
|
|
}
|
|
else {
|
|
expert_add_info_format(pinfo, pi, PI_PROTOCOL, PI_WARN,
|
|
"This APDU must be sent from CAM to host");
|
|
}
|
|
/* don't return, we can continue dissecting the APDU */
|
|
}
|
|
if (ai->min_len_field!=LEN_FIELD_ANY && len_field<ai->min_len_field) {
|
|
pi = proto_tree_add_text(app_tree, tvb, 0, APDU_TAG_SIZE,
|
|
"Invalid APDU length field");
|
|
expert_add_info_format(pinfo, pi, PI_MALFORMED, PI_ERROR,
|
|
"Minimum length field for %s is %d",
|
|
tag_str, ai->min_len_field);
|
|
return;
|
|
}
|
|
if (ai->len_field!=LEN_FIELD_ANY && len_field!=ai->len_field) {
|
|
pi = proto_tree_add_text(app_tree, tvb, 0, APDU_TAG_SIZE,
|
|
"Invalid APDU length field");
|
|
expert_add_info_format(pinfo, pi, PI_MALFORMED, PI_ERROR,
|
|
"Length field for %s must be %d", tag_str, ai->len_field);
|
|
return;
|
|
}
|
|
if (ai->len_field!=0) {
|
|
if (!ai->dissect_payload) {
|
|
/* don't display an error, getting here means we have illegal
|
|
* data in apdu_info[] */
|
|
return;
|
|
}
|
|
ai->dissect_payload(tag, len_field, tvb, offset, pinfo, app_tree);
|
|
}
|
|
}
|
|
|
|
static void
|
|
dissect_dvbci_spdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
|
|
guint8 direction)
|
|
{
|
|
guint32 spdu_len;
|
|
proto_item *ti = NULL;
|
|
proto_tree *sess_tree = NULL;
|
|
guint8 tag;
|
|
const gchar *tag_str;
|
|
gint offset;
|
|
proto_item *pi;
|
|
guint32 len_field;
|
|
const spdu_info_t *si;
|
|
guint32 res_id;
|
|
guint8 sess_stat;
|
|
tvbuff_t *payload_tvb = NULL;
|
|
gint payload_len;
|
|
|
|
|
|
spdu_len = tvb_reported_length(tvb);
|
|
|
|
if (tree) {
|
|
ti = proto_tree_add_text(tree, tvb, 0, -1, "Session Layer");
|
|
sess_tree = proto_item_add_subtree(ti, ett_dvbci_session);
|
|
}
|
|
|
|
tag = tvb_get_guint8(tvb,0);
|
|
tag_str = match_strval(tag, dvbci_spdu_tag);
|
|
col_add_str(pinfo->cinfo, COL_INFO,
|
|
val_to_str_const(tag, dvbci_spdu_tag, "Invalid SPDU"));
|
|
if (tag_str) {
|
|
proto_tree_add_item(sess_tree, hf_dvbci_spdu_tag, tvb, 0, 1, ENC_NA);
|
|
}
|
|
else {
|
|
pi = proto_tree_add_text(sess_tree, tvb, 0, 1, "Invalid SPDU tag");
|
|
expert_add_info_format(pinfo, pi, PI_MALFORMED, PI_ERROR,
|
|
"See table 14 in the DVB-CI specification");
|
|
return;
|
|
}
|
|
|
|
offset = dissect_ber_length(pinfo, sess_tree, tvb, 1, &len_field, NULL);
|
|
|
|
si = (spdu_info_t *)g_hash_table_lookup(spdu_table,
|
|
GUINT_TO_POINTER((guint)tag));
|
|
if (!si)
|
|
return;
|
|
if (si->direction!=0 && si->direction!=direction) {
|
|
pi = proto_tree_add_text(sess_tree, tvb, 0, 1,
|
|
"Invalid SPDU direction");
|
|
if (si->direction==DATA_HOST_TO_CAM) {
|
|
expert_add_info_format(pinfo, pi, PI_PROTOCOL, PI_WARN,
|
|
"This SPDU must be sent from host to CAM");
|
|
}
|
|
else {
|
|
expert_add_info_format(pinfo, pi, PI_PROTOCOL, PI_WARN,
|
|
"This SPDU must be sent from CAM to host");
|
|
}
|
|
}
|
|
if (si->len_field != len_field) {
|
|
/* offset points to 1st byte after the length field */
|
|
pi = proto_tree_add_text(sess_tree, tvb, 1, offset-1,
|
|
"Invalid SPDU length field");
|
|
expert_add_info_format(pinfo, pi, PI_MALFORMED, PI_ERROR,
|
|
"Correct length field for %s is %d", tag_str, si->len_field);
|
|
return;
|
|
}
|
|
|
|
switch(tag)
|
|
{
|
|
case T_OPEN_SESSION_REQUEST:
|
|
res_id = tvb_get_ntohl(tvb, offset); /* get 32bit big-endian */
|
|
dissect_dvbci_res_id(tvb, offset, pinfo, sess_tree, res_id, TRUE);
|
|
break;
|
|
case T_CREATE_SESSION:
|
|
res_id = tvb_get_ntohl(tvb, offset);
|
|
dissect_dvbci_res_id(tvb, offset, pinfo, sess_tree, res_id, TRUE);
|
|
/* DVB-CI uses network byte order == big endian */
|
|
proto_tree_add_item(
|
|
sess_tree, hf_dvbci_sess_nb, tvb,
|
|
offset+4, 2, ENC_BIG_ENDIAN);
|
|
break;
|
|
case T_OPEN_SESSION_RESPONSE:
|
|
case T_CREATE_SESSION_RESPONSE:
|
|
sess_stat = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_item(
|
|
sess_tree, hf_dvbci_sess_status, tvb, offset, 1, ENC_NA);
|
|
res_id = tvb_get_ntohl(tvb, offset+1);
|
|
dissect_dvbci_res_id(tvb, offset+1, pinfo, sess_tree, res_id, TRUE);
|
|
proto_tree_add_item(sess_tree, hf_dvbci_sess_nb, tvb,
|
|
offset+1+RES_ID_LEN, 2, ENC_BIG_ENDIAN);
|
|
if (sess_stat == SESS_OPENED)
|
|
col_append_sep_str(pinfo->cinfo, COL_INFO, NULL,
|
|
"Session opened");
|
|
else
|
|
col_append_sep_str(pinfo->cinfo, COL_INFO, NULL, "Error");
|
|
break;
|
|
case T_CLOSE_SESSION_REQUEST:
|
|
proto_tree_add_item(
|
|
sess_tree, hf_dvbci_sess_nb, tvb,
|
|
offset+4, 2, ENC_BIG_ENDIAN);
|
|
break;
|
|
case T_CLOSE_SESSION_RESPONSE:
|
|
sess_stat = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_item(
|
|
sess_tree, hf_dvbci_close_sess_status, tvb,
|
|
offset, 1, ENC_NA);
|
|
proto_tree_add_item(
|
|
sess_tree, hf_dvbci_sess_nb, tvb,
|
|
offset+1, 2, ENC_BIG_ENDIAN);
|
|
if (sess_stat == SESS_CLOSED) {
|
|
col_append_sep_str(pinfo->cinfo, COL_INFO, NULL,
|
|
"Session closed");
|
|
}
|
|
else
|
|
col_append_sep_str(pinfo->cinfo, COL_INFO, NULL, "Error");
|
|
break;
|
|
case T_SESSION_NUMBER:
|
|
proto_tree_add_item(
|
|
sess_tree, hf_dvbci_sess_nb, tvb,
|
|
offset, 2, ENC_BIG_ENDIAN);
|
|
payload_len = tvb_reported_length_remaining(tvb, offset+2);
|
|
payload_tvb =
|
|
tvb_new_subset(tvb, offset+2, payload_len, payload_len);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
offset += len_field;
|
|
|
|
if (payload_tvb) {
|
|
proto_item_set_len(ti, spdu_len-tvb_reported_length(payload_tvb));
|
|
dissect_dvbci_apdu(payload_tvb, pinfo, tree, direction);
|
|
}
|
|
else {
|
|
proto_item_set_len(ti, spdu_len);
|
|
}
|
|
}
|
|
|
|
/* dissect the status of an r_tpdu, return its length or -1 for error */
|
|
static gint
|
|
dissect_dvbci_tpdu_status(tvbuff_t *tvb, gint offset,
|
|
packet_info *pinfo, proto_tree *tree,
|
|
guint8 lpdu_tcid, guint8 r_tpdu_tag)
|
|
{
|
|
gint offset_new, len_start_offset;
|
|
guint8 tag;
|
|
guint32 len_field;
|
|
guint8 t_c_id, sb_value;
|
|
const gchar *sb_str;
|
|
proto_item *pi;
|
|
|
|
offset_new = offset;
|
|
|
|
tag = tvb_get_guint8(tvb, offset_new);
|
|
if (tag!=T_SB) {
|
|
pi = proto_tree_add_text(
|
|
tree, tvb, offset_new, 1, "Invalid status tag");
|
|
expert_add_info_format(pinfo, pi, PI_MALFORMED, PI_ERROR,
|
|
"This must always be T_SB (0x80)");
|
|
return -1;
|
|
}
|
|
col_append_sep_str(pinfo->cinfo, COL_INFO, NULL, "T_SB");
|
|
proto_tree_add_text(tree, tvb, offset_new, 1, "Response TPDU status");
|
|
offset_new++;
|
|
|
|
len_start_offset = offset_new;
|
|
offset_new = dissect_ber_length(
|
|
pinfo, tree, tvb, offset_new, &len_field, NULL);
|
|
if (len_field != 2) {
|
|
pi = proto_tree_add_text(
|
|
tree, tvb, len_start_offset, offset_new-len_start_offset,
|
|
"Invalid status length field");
|
|
expert_add_info_format(pinfo, pi, PI_MALFORMED, PI_ERROR,
|
|
"This must always be 2");
|
|
|
|
return -1;
|
|
}
|
|
|
|
t_c_id = tvb_get_guint8(tvb, offset_new);
|
|
proto_tree_add_item(tree, hf_dvbci_t_c_id, tvb, offset_new, 1, ENC_NA);
|
|
/* tcid in transport header and link layer must only match for data
|
|
* transmission commands */
|
|
if (t_c_id!=lpdu_tcid) {
|
|
if (r_tpdu_tag==NO_TAG ||
|
|
r_tpdu_tag==T_DATA_MORE || r_tpdu_tag==T_DATA_LAST) {
|
|
|
|
pi = proto_tree_add_text(tree, tvb, offset_new, 1,
|
|
"Transport Connection ID mismatch");
|
|
expert_add_info_format(pinfo, pi, PI_PROTOCOL, PI_WARN,
|
|
"tcid is %d in the transport layer and %d in the link layer",
|
|
t_c_id, lpdu_tcid);
|
|
|
|
return -1;
|
|
}
|
|
}
|
|
offset_new++;
|
|
|
|
sb_value = tvb_get_guint8(tvb, offset_new);
|
|
sb_str = match_strval(sb_value, dvbci_sb_value);
|
|
if (sb_str) {
|
|
col_append_sep_fstr(pinfo->cinfo, COL_INFO, ": ", "%s", sb_str);
|
|
proto_tree_add_item(tree, hf_dvbci_sb_value, tvb,
|
|
offset_new, 1, ENC_NA);
|
|
}
|
|
else {
|
|
pi = proto_tree_add_text(tree, tvb, offset_new, 1,
|
|
"Invalid SB_value");
|
|
expert_add_info_format(pinfo, pi, PI_PROTOCOL, PI_WARN,
|
|
"Must be 0x00 or 0x80");
|
|
}
|
|
offset_new++;
|
|
|
|
return offset_new-offset;
|
|
}
|
|
|
|
|
|
/* dissect the header of a c_tpdu or r_tpdu
|
|
return the length of the header (tag, len_field, t_c_id) or -1 for error */
|
|
static gint
|
|
dissect_dvbci_tpdu_hdr(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
|
|
guint8 direction, guint8 lpdu_tcid, guint32 tpdu_len,
|
|
guint8 *hdr_tag, guint32 *body_len)
|
|
{
|
|
guint8 c_tpdu_tag, r_tpdu_tag, *tag=NULL;
|
|
const gchar *c_tpdu_str, *r_tpdu_str;
|
|
proto_item *pi;
|
|
gint offset;
|
|
guint32 len_field;
|
|
guint8 t_c_id;
|
|
|
|
if (direction==DATA_HOST_TO_CAM) {
|
|
c_tpdu_tag = tvb_get_guint8(tvb, 0);
|
|
tag = &c_tpdu_tag;
|
|
c_tpdu_str = match_strval(c_tpdu_tag, dvbci_c_tpdu);
|
|
if (c_tpdu_str) {
|
|
col_append_sep_fstr(pinfo->cinfo, COL_INFO, NULL, "%s", c_tpdu_str);
|
|
proto_tree_add_item(tree, hf_dvbci_c_tpdu_tag, tvb, 0, 1, ENC_NA);
|
|
}
|
|
else {
|
|
col_append_sep_fstr(pinfo->cinfo, COL_INFO, NULL,
|
|
"Invalid Command-TPDU tag");
|
|
pi = proto_tree_add_text(
|
|
tree, tvb, 0, 1, "Invalid Command-TPDU tag");
|
|
expert_add_info_format(pinfo, pi, PI_MALFORMED, PI_ERROR,
|
|
"see DVB-CI specification, table A.16 for valid values");
|
|
return -1;
|
|
}
|
|
}
|
|
else {
|
|
r_tpdu_tag = tvb_get_guint8(tvb, 0);
|
|
tag = &r_tpdu_tag;
|
|
r_tpdu_str = match_strval(r_tpdu_tag, dvbci_r_tpdu);
|
|
if (r_tpdu_str) {
|
|
col_append_sep_fstr(pinfo->cinfo, COL_INFO, NULL, "%s", r_tpdu_str);
|
|
proto_tree_add_item(tree, hf_dvbci_r_tpdu_tag, tvb, 0, 1, ENC_NA);
|
|
}
|
|
else {
|
|
if (r_tpdu_tag == T_SB) {
|
|
/* we have an r_tpdu without header and body,
|
|
it contains only the status part */
|
|
if (hdr_tag)
|
|
*hdr_tag = NO_TAG;
|
|
if (body_len)
|
|
*body_len = 0;
|
|
return 0;
|
|
}
|
|
else {
|
|
col_append_sep_fstr(pinfo->cinfo, COL_INFO, NULL,
|
|
"Invalid Response-TPDU tag");
|
|
pi = proto_tree_add_text(
|
|
tree, tvb, 0, 1, "Invalid Response-TPDU tag");
|
|
expert_add_info_format(pinfo, pi, PI_MALFORMED, PI_ERROR,
|
|
"see DVB-CI specification, table A.16 for valid values");
|
|
return -1;
|
|
}
|
|
}
|
|
}
|
|
|
|
offset = dissect_ber_length(pinfo, tree, tvb, 1, &len_field, NULL);
|
|
if (((direction==DATA_HOST_TO_CAM) && ((offset+len_field)!=tpdu_len)) ||
|
|
((direction==DATA_CAM_TO_HOST) && ((offset+len_field)>tpdu_len))) {
|
|
/* offset points to 1st byte after the length field */
|
|
pi = proto_tree_add_text(
|
|
tree, tvb, 1, offset-1, "Length field mismatch");
|
|
expert_add_info_format(pinfo, pi, PI_MALFORMED, PI_ERROR,
|
|
"Length field mismatch");
|
|
return -1;
|
|
}
|
|
|
|
t_c_id = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_item(tree, hf_dvbci_t_c_id, tvb, offset, 1, ENC_NA);
|
|
/* tcid in transport header and link layer must only match for
|
|
* data transmission commands */
|
|
if (t_c_id!=lpdu_tcid) {
|
|
if (tag && (*tag==T_RCV || *tag==T_DATA_MORE || *tag==T_DATA_LAST)) {
|
|
pi = proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Transport Connection ID mismatch");
|
|
expert_add_info_format(pinfo, pi, PI_PROTOCOL, PI_WARN,
|
|
"tcid is %d in the transport layer and %d in the link layer",
|
|
t_c_id, lpdu_tcid);
|
|
}
|
|
}
|
|
else {
|
|
col_append_sep_fstr(pinfo->cinfo, COL_INFO, ": ", "tcid %d", t_c_id);
|
|
}
|
|
offset++;
|
|
|
|
if (hdr_tag && tag)
|
|
*hdr_tag = *tag;
|
|
if (body_len)
|
|
*body_len = len_field-1; /* -1 for t_c_id */
|
|
return offset;
|
|
}
|
|
|
|
static void
|
|
dissect_dvbci_tpdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
|
|
guint8 direction, guint8 lpdu_tcid)
|
|
{
|
|
guint32 tpdu_len, body_len;
|
|
proto_item *ti = NULL;
|
|
proto_tree *trans_tree = NULL;
|
|
gint offset, status_len;
|
|
guint8 hdr_tag = NO_TAG;
|
|
tvbuff_t *payload_tvb = NULL;
|
|
proto_item *pi;
|
|
|
|
|
|
tpdu_len = tvb_reported_length(tvb);
|
|
|
|
col_clear(pinfo->cinfo, COL_INFO);
|
|
|
|
if (tree) {
|
|
ti = proto_tree_add_text(tree, tvb, 0, -1, "Transport Layer");
|
|
trans_tree = proto_item_add_subtree(ti, ett_dvbci_transport);
|
|
}
|
|
|
|
offset = dissect_dvbci_tpdu_hdr(tvb, pinfo, trans_tree, direction,
|
|
lpdu_tcid, tpdu_len, &hdr_tag, &body_len);
|
|
if (offset==-1)
|
|
return;
|
|
proto_item_set_len(ti, offset);
|
|
if ((offset>0) && (body_len!=0)) {
|
|
payload_tvb = tvb_new_subset(tvb, offset, body_len, body_len);
|
|
offset += body_len;
|
|
}
|
|
|
|
if (direction==DATA_CAM_TO_HOST) {
|
|
/* minimum length of an rtpdu status is 4 bytes */
|
|
if (tpdu_len-offset < 4) {
|
|
pi = proto_tree_add_text(trans_tree, tvb, 0, 0,
|
|
"Response TPDU's status part is missing");
|
|
expert_add_info_format(pinfo, pi, PI_MALFORMED, PI_ERROR,
|
|
"RTPDU status is mandatory");
|
|
return;
|
|
}
|
|
status_len = dissect_dvbci_tpdu_status(
|
|
tvb, offset, pinfo, trans_tree, lpdu_tcid, hdr_tag);
|
|
if (status_len<0)
|
|
return;
|
|
proto_tree_set_appendix(trans_tree, tvb, offset, status_len);
|
|
}
|
|
|
|
if (payload_tvb)
|
|
dissect_dvbci_spdu(payload_tvb, pinfo, tree, direction);
|
|
}
|
|
|
|
|
|
static void
|
|
dissect_dvbci_lpdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
|
|
guint8 direction)
|
|
{
|
|
proto_item *ti;
|
|
proto_tree *link_tree = NULL;
|
|
guint32 payload_len;
|
|
guint8 tcid, more_last;
|
|
proto_item *pi;
|
|
tvbuff_t *payload_tvb = NULL;
|
|
|
|
|
|
payload_len = tvb_reported_length(tvb);
|
|
|
|
col_add_str(pinfo->cinfo, COL_INFO, "LPDU");
|
|
|
|
if (tree) {
|
|
ti = proto_tree_add_text(tree, tvb, 0, 2, "Link Layer");
|
|
link_tree = proto_item_add_subtree(ti, ett_dvbci_link);
|
|
}
|
|
|
|
tcid = tvb_get_guint8(tvb, 0);
|
|
col_append_sep_fstr(pinfo->cinfo, COL_INFO, ": ", "tcid %d", tcid);
|
|
proto_tree_add_item(link_tree, hf_dvbci_tcid, tvb, 0, 1, ENC_NA);
|
|
|
|
more_last = tvb_get_guint8(tvb, 1);
|
|
if (more_last == ML_MORE) {
|
|
col_append_sep_fstr(
|
|
pinfo->cinfo, COL_INFO, NULL, "more fragments follow");
|
|
}
|
|
else if (more_last == ML_LAST)
|
|
col_append_sep_fstr(pinfo->cinfo, COL_INFO, NULL, "last fragment");
|
|
|
|
if (match_strval(more_last, dvbci_ml)) {
|
|
proto_tree_add_item(link_tree, hf_dvbci_ml, tvb, 1, 1, ENC_NA);
|
|
}
|
|
else {
|
|
pi = proto_tree_add_text(
|
|
link_tree, tvb, 1, 1, "Invalid More/Last indicator");
|
|
expert_add_info_format(pinfo, pi, PI_PROTOCOL, PI_WARN,
|
|
"Second byte of an LPDU must be 0x80 or 0x00");
|
|
}
|
|
/* keep this error case separate, it'll be removed soon */
|
|
if (more_last == ML_MORE) {
|
|
pi = proto_tree_add_text(link_tree, tvb, 1, 1, "Unsupported LPDU");
|
|
expert_add_info_format(pinfo, pi, PI_PROTOCOL, PI_WARN,
|
|
"Reassembly of fragmented packets is not implemented yet");
|
|
return;
|
|
}
|
|
|
|
if (payload_len > buf_size_host) {
|
|
pi = proto_tree_add_text(
|
|
link_tree, tvb, 2, payload_len, "Payload too large");
|
|
expert_add_info_format(pinfo, pi, PI_PROTOCOL, PI_WARN,
|
|
"Maximum payload length is the negotiated buffer size (%d bytes)",
|
|
buf_size_host);
|
|
}
|
|
|
|
payload_tvb = tvb_new_subset(tvb, 2, -1, -1);
|
|
dissect_dvbci_tpdu(payload_tvb, pinfo, tree, direction, tcid);
|
|
}
|
|
|
|
/* dissect DVB-CI buffer size negotiation */
|
|
static void
|
|
dissect_dvbci_buf_neg(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
|
|
guint8 direction)
|
|
{
|
|
guint16 buf_size;
|
|
proto_item *pi;
|
|
|
|
buf_size = tvb_get_ntohs(tvb, 0);
|
|
|
|
col_add_fstr(pinfo->cinfo, COL_INFO, "%s: %u bytes",
|
|
direction == DATA_HOST_TO_CAM ?
|
|
"negotiated buffer size" : "buffer size proposal",
|
|
buf_size);
|
|
|
|
if (direction == DATA_HOST_TO_CAM) {
|
|
buf_size_host = buf_size;
|
|
proto_tree_add_uint_format(tree, hf_dvbci_buf_size, tvb,
|
|
0, 2, buf_size,
|
|
"Negotiated buffer size: %u bytes", buf_size);
|
|
if (buf_size_host > buf_size_cam) {
|
|
/* ATTENTION:
|
|
wireshark may run through each packet multiple times
|
|
if we didn't check the direction, we'd get the error when
|
|
wireshark runs through the initial CAM packet for the 2nd time
|
|
*/
|
|
pi = proto_tree_add_text(tree, tvb, 0, 2,
|
|
"Illegal buffer size command");
|
|
expert_add_info_format(pinfo, pi, PI_PROTOCOL, PI_WARN,
|
|
"Host shall not request a buffer size larger than the CAM proposal");
|
|
}
|
|
}
|
|
else if (direction == DATA_CAM_TO_HOST) {
|
|
buf_size_cam = buf_size;
|
|
proto_tree_add_uint_format(tree, hf_dvbci_buf_size, tvb,
|
|
0, 2, buf_size,
|
|
"Buffer size proposal by the CAM: %u bytes", buf_size);
|
|
}
|
|
|
|
if (buf_size < 16) {
|
|
pi = proto_tree_add_text(tree, tvb, 0, 2, "Illegal buffer size");
|
|
expert_add_info_format(pinfo, pi, PI_PROTOCOL, PI_WARN,
|
|
"Minimum buffer size is 16 bytes");
|
|
}
|
|
}
|
|
|
|
static int
|
|
dissect_dvbci(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
gint packet_len, offset = 0;
|
|
guint8 version, event;
|
|
const gchar *event_str;
|
|
guint16 len_field;
|
|
proto_item *ti;
|
|
proto_tree *dvbci_tree = NULL;
|
|
tvbuff_t *payload_tvb;
|
|
guint16 cor_addr;
|
|
guint8 cor_value;
|
|
guint8 hw_event;
|
|
|
|
if (tvb_length(tvb) < 4)
|
|
return 0;
|
|
|
|
version = tvb_get_guint8(tvb, offset++);
|
|
if (version != 0)
|
|
return 0;
|
|
|
|
event = tvb_get_guint8(tvb, offset++);
|
|
event_str = match_strval(event, dvbci_event);
|
|
if (!event_str)
|
|
return 0;
|
|
|
|
packet_len = tvb_reported_length(tvb);
|
|
len_field = tvb_get_ntohs(tvb, offset);
|
|
|
|
if (len_field != (packet_len-4))
|
|
return 0;
|
|
|
|
offset += 2;
|
|
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "DVB-CI");
|
|
col_set_str(pinfo->cinfo, COL_INFO, event_str);
|
|
|
|
if (tree) {
|
|
ti = proto_tree_add_protocol_format(tree, proto_dvbci,
|
|
tvb, 0, packet_len, "DVB Common Interface: %s", event_str);
|
|
dvbci_tree = proto_item_add_subtree(ti, ett_dvbci);
|
|
proto_tree_add_text(dvbci_tree, tvb, 0, offset,
|
|
"version: %d, event: 0x%x (%s), length field: %d",
|
|
version, event, event_str, len_field);
|
|
}
|
|
|
|
if (IS_DATA_TRANSFER(event)) {
|
|
if (event == DATA_HOST_TO_CAM) {
|
|
SET_ADDRESS(&pinfo->src, AT_STRINGZ, (int)strlen(ADDR_HOST)+1, ADDR_HOST);
|
|
SET_ADDRESS(&pinfo->dst, AT_STRINGZ, (int)strlen(ADDR_CAM)+1 , ADDR_CAM);
|
|
}
|
|
else {
|
|
SET_ADDRESS(&pinfo->src, AT_STRINGZ, (int)strlen(ADDR_CAM)+1 , ADDR_CAM);
|
|
SET_ADDRESS(&pinfo->dst, AT_STRINGZ, (int)strlen(ADDR_HOST)+1, ADDR_HOST);
|
|
}
|
|
|
|
payload_tvb = tvb_new_subset( tvb, offset, -1, -1);
|
|
if (len_field == 2) {
|
|
dissect_dvbci_buf_neg(payload_tvb, pinfo, dvbci_tree, event);
|
|
}
|
|
else {
|
|
dissect_dvbci_lpdu(payload_tvb, pinfo, dvbci_tree, event);
|
|
}
|
|
}
|
|
else if (event==COR_WRITE) {
|
|
/* I did not assign hf_... values for cor_addr and cor_value
|
|
there's no need to filter against them */
|
|
cor_addr = tvb_get_ntohs(tvb, offset);
|
|
proto_tree_add_text(dvbci_tree, tvb, offset, 2,
|
|
"COR address: 0x%x", cor_addr);
|
|
offset += 2;
|
|
cor_value = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_text(dvbci_tree, tvb, offset, 1,
|
|
"COR value: 0x%x", cor_value);
|
|
offset++;
|
|
col_append_sep_fstr(pinfo->cinfo, COL_INFO, ": ",
|
|
"address 0x%x, value 0x%x", cor_addr, cor_value);
|
|
}
|
|
else if (event==HW_EVT) {
|
|
hw_event = tvb_get_guint8(tvb, offset);
|
|
col_set_str(pinfo->cinfo, COL_INFO,
|
|
val_to_str_const(hw_event, dvbci_hw_event, "Invalid hardware event"));
|
|
proto_tree_add_item(dvbci_tree, hf_dvbci_hw_event,
|
|
tvb, offset, 1, ENC_NA);
|
|
offset++;
|
|
}
|
|
|
|
return packet_len;
|
|
}
|
|
|
|
|
|
void
|
|
proto_register_dvbci(void)
|
|
{
|
|
guint i;
|
|
|
|
static gint *ett[] = {
|
|
&ett_dvbci,
|
|
&ett_dvbci_link,
|
|
&ett_dvbci_transport,
|
|
&ett_dvbci_session,
|
|
&ett_dvbci_res,
|
|
&ett_dvbci_application,
|
|
&ett_dvbci_es,
|
|
&ett_dvbci_ca_desc
|
|
};
|
|
|
|
static hf_register_info hf[] = {
|
|
{ &hf_dvbci_hw_event,
|
|
{ "Hardware event", "dvbci.hw_event", FT_UINT8, BASE_HEX,
|
|
VALS(dvbci_hw_event), 0, NULL, HFILL } },
|
|
{ &hf_dvbci_buf_size,
|
|
{ "Buffer Size", "dvbci.buf_size", FT_UINT16, BASE_HEX,
|
|
NULL, 0, NULL, HFILL } },
|
|
{ &hf_dvbci_tcid,
|
|
{ "Transport Connection ID", "dvbci.tcid", FT_UINT8, BASE_HEX,
|
|
NULL, 0, NULL, HFILL } },
|
|
{ &hf_dvbci_ml,
|
|
{ "More/Last indicator", "dvbci.more_last", FT_UINT8, BASE_HEX,
|
|
VALS(dvbci_ml), 0, NULL, HFILL } },
|
|
{ &hf_dvbci_c_tpdu_tag,
|
|
{ "Command TPDU Tag", "dvbci.c_tpdu_tag", FT_UINT8, BASE_HEX,
|
|
VALS(dvbci_c_tpdu), 0, NULL, HFILL } },
|
|
{ &hf_dvbci_r_tpdu_tag,
|
|
{ "Response TPDU Tag", "dvbci.r_tpdu_tag", FT_UINT8, BASE_HEX,
|
|
VALS(dvbci_r_tpdu), 0, NULL, HFILL } },
|
|
{ &hf_dvbci_t_c_id,
|
|
{ "Transport Connection ID", "dvbci.t_c_id", FT_UINT8, BASE_HEX,
|
|
NULL, 0, NULL, HFILL } },
|
|
{ &hf_dvbci_sb_value,
|
|
{ "SB Value", "dvbci.sb_value", FT_UINT8, BASE_HEX,
|
|
VALS(dvbci_sb_value), 0, NULL, HFILL } },
|
|
{ &hf_dvbci_spdu_tag,
|
|
{ "SPDU Tag", "dvbci.spdu_tag", FT_UINT8, BASE_HEX,
|
|
VALS(dvbci_spdu_tag), 0, NULL, HFILL } },
|
|
{ &hf_dvbci_sess_status,
|
|
{ "Session Status", "dvbci.session_status", FT_UINT8, BASE_HEX,
|
|
VALS(dvbci_sess_status), 0, NULL, HFILL } },
|
|
{ &hf_dvbci_sess_nb,
|
|
{ "Session Number", "dvbci.session_nb", FT_UINT16, BASE_DEC,
|
|
NULL , 0, NULL, HFILL } },
|
|
{ &hf_dvbci_close_sess_status,
|
|
{ "Session Status", "dvbci.close_session_status", FT_UINT8,
|
|
BASE_HEX, VALS(dvbci_close_sess_status), 0, NULL, HFILL } },
|
|
{ &hf_dvbci_apdu_tag,
|
|
{ "APDU Tag", "dvbci.apdu_tag", FT_UINT24, BASE_HEX,
|
|
VALS(dvbci_apdu_tag), 0, NULL, HFILL } },
|
|
{ &hf_dvbci_app_type,
|
|
{ "Application type", "dvbci.application_type", FT_UINT8,
|
|
BASE_HEX, VALS(dvbci_app_type), 0, NULL, HFILL } },
|
|
{ &hf_dvbci_app_manf,
|
|
{ "Application manufacturer", "dvbci.application_manufacturer",
|
|
FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL } },
|
|
{ &hf_dvbci_manf_code,
|
|
{ "Manufacturer code", "dvbci.manufacturer_code", FT_UINT16,
|
|
BASE_HEX, NULL, 0, NULL, HFILL } },
|
|
{ &hf_dvbci_menu_str_len,
|
|
{ "Menu string length", "dvbci.menu_string_length",
|
|
FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } },
|
|
{ &hf_dvbci_ca_sys_id,
|
|
{ "CA system ID", "dvbci.ca_system_id", FT_UINT16, BASE_HEX,
|
|
NULL, 0, NULL, HFILL } },
|
|
{ &hf_dvbci_ca_pmt_list_mgmt,
|
|
{ "CA PMT list management", "dvbci.ca_pmt_list_management",
|
|
FT_UINT8, BASE_HEX, VALS(dvbci_ca_pmt_list_mgmt), 0, NULL,
|
|
HFILL } },
|
|
{ &hf_dvbci_prog_num,
|
|
{ "Program number", "dvbci.program_number", FT_UINT16, BASE_HEX,
|
|
NULL, 0, NULL, HFILL } },
|
|
{ &hf_dvbci_ver_cn_ind,
|
|
{ "Version, current next indicator", "dvbci.ver_cn_ind", FT_UINT8,
|
|
BASE_HEX, NULL, 0, NULL, HFILL } },
|
|
{ &hf_dvbci_prog_info_len,
|
|
{ "Program info length", "dvbci.program_info_length", FT_UINT16,
|
|
BASE_HEX, NULL, 0x0FFF, NULL, HFILL } },
|
|
{ &hf_dvbci_stream_type,
|
|
{ "Stream type", "dvbci.stream_type", FT_UINT8, BASE_HEX,
|
|
NULL, 0, NULL, HFILL } },
|
|
{ &hf_dvbci_es_pid,
|
|
{ "Elementary stream PID", "dvbci.elementary_pid", FT_UINT16,
|
|
BASE_HEX, NULL, 0x1FFF, NULL, HFILL } },
|
|
{ &hf_dvbci_es_info_len,
|
|
{ "Elementary stream info length", "dvbci.es_info_length",
|
|
FT_UINT16, BASE_HEX, NULL, 0x0FFF, NULL, HFILL } },
|
|
{ &hf_dvbci_ca_pmt_cmd_id,
|
|
{ "CA PMT command ID", "dvbci.ca_pmt_cmd_id", FT_UINT8, BASE_HEX,
|
|
VALS(dvbci_ca_pmt_cmd_id), 0, NULL, HFILL } },
|
|
{ &hf_dvbci_descr_len,
|
|
{ "CA descriptor length", "dvbci.ca_desc_len", FT_UINT8, BASE_DEC,
|
|
NULL, 0, NULL, HFILL } },
|
|
{ &hf_dvbci_ca_pid,
|
|
{ "CA PID", "dvbci.ca_pid", FT_UINT16, BASE_HEX,
|
|
NULL, 0x1FFF, NULL, HFILL } }
|
|
};
|
|
|
|
spdu_table = g_hash_table_new(g_direct_hash, g_direct_equal);
|
|
if (!spdu_table)
|
|
return;
|
|
for(i=0; i<array_length(spdu_info); i++) {
|
|
g_hash_table_insert(spdu_table,
|
|
GUINT_TO_POINTER((guint)spdu_info[i].tag),
|
|
(gpointer)(&spdu_info[i]));
|
|
}
|
|
apdu_table = g_hash_table_new(g_direct_hash, g_direct_equal);
|
|
if (!apdu_table)
|
|
return;
|
|
for(i=0; i<array_length(apdu_info); i++) {
|
|
g_hash_table_insert(apdu_table,
|
|
GUINT_TO_POINTER((guint)apdu_info[i].tag),
|
|
(gpointer)(&apdu_info[i]));
|
|
}
|
|
|
|
proto_dvbci = proto_register_protocol(
|
|
"DVB Common Interface", "DVB-CI", "dvb-ci");
|
|
proto_register_field_array(proto_dvbci, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
register_init_routine(dvbci_init);
|
|
}
|
|
|
|
|
|
void
|
|
proto_reg_handoff_dvbci(void)
|
|
{
|
|
dissector_handle_t dvbci_handle;
|
|
|
|
dvbci_handle = new_create_dissector_handle(dissect_dvbci, proto_dvbci);
|
|
dissector_add_uint("wtap_encap", WTAP_ENCAP_DVBCI, dvbci_handle);
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 4
|
|
* tab-width: 8
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*
|
|
* vi: shiftwidth=4 tabstop=8 expandtab
|
|
* :indentSize=4:tabSize=8:noTabs=true:
|
|
*/
|