776 lines
26 KiB
C
776 lines
26 KiB
C
/* packet-iec104.c
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* Routines for IEC-60870-5-104 (iec104) Protocol disassembly
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*
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*
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* $Id$
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*
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* Copyright (c) 2008 by Joan Ramio <joan@ramio.cat>
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* Joan is a masculine catalan name. Search the Internet for Joan Pujol (alias Garbo).
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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 1999 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (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
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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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 <stdio.h>
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#include <string.h>
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/dissectors/packet-tcp.h>
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#include <epan/prefs.h>
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#include <epan/emem.h>
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/* IEC-104 comment: Fields are little endian. */
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#define MAXS 256
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static dissector_handle_t iec104asdu_handle;
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/******* Utility to add to 'value_string.c' *******/
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/* Tries to match val against each element in the value_string array vs.
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Returns the associated string length on a match.
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Returns 100, on failure. */
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guint8 val_to_strlen(guint32 val, const value_string *vs);
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guint8 val_to_strlen(guint32 val, const value_string *vs) {
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const gchar *ret;
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ret = match_strval(val, vs);
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if (ret != NULL)
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return strlen(ret);
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return 100;
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}
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/* the asdu header structure */
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struct asduheader {
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guint8 AddrLow;
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guint8 AddrHigh;
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guint8 OA;
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guint8 TypeId;
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guint8 TNCause;
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guint32 IOA;
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guint8 NumIx;
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guint8 SQ;
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};
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/* the apci header structure */
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struct apciheader {
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guint8 ApduLen;
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guint8 Type;
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guint8 UType;
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guint16 Tx;
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guint16 Rx;
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};
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static guint iec104port = 2404;
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void proto_reg_handoff_iec104(void);
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/* Define the iec104 proto */
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static int proto_iec104apci = -1;
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static int proto_iec104asdu = -1;
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/* Protocol constants */
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#define APCI_START 0x68
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#define APCI_LEN 6
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#define APDU_MIN_LEN 4
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#define APDU_MAX_LEN 253
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/* ASDU_HEAD_LEN: Includes Asdu head and first IOA */
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#define ASDU_HEAD_LEN 9
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#define F_TEST 0x80
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#define F_NEGA 0x40
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#define F_CAUSE 0x3F
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#define F_SQ 0x80
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/* APCI types */
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#define I_TYPE 0
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#define S_TYPE 1
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#define U_TYPE 3
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#define APCI_TYPE_UNKNOWN 4
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static const value_string apci_types [] = {
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{ I_TYPE, "I" },
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{ S_TYPE, "S" },
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{ U_TYPE, "U" },
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{ 0, NULL }
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};
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/* Constants relative to the filed, independent of the field position in the byte */
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/* U (Unnombered) constants */
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#define U_STARTDT_ACT 0x01
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#define U_STARTDT_CON 0x02
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#define U_STOPDT_ACT 0x04
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#define U_STOPDT_CON 0x08
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#define U_TESTFR_ACT 0x10
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#define U_TESTFR_CON 0x20
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static const value_string u_types[] = {
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{ U_STARTDT_ACT, "STARTDT act" },
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{ U_STARTDT_CON, "STARTDT con" },
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{ U_STOPDT_ACT, "STOPDT act" },
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{ U_STOPDT_CON, "STOPDT con" },
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{ U_TESTFR_ACT, "TESTFR act" },
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{ U_TESTFR_CON, "TESTFR con" },
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{ 0, NULL }
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};
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/* ASDU types (TypeId) */
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#define M_SP_NA_1 1 /* single-point information */
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#define M_DP_NA_1 3 /* double-point information */
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#define M_ST_NA_1 5 /* step position information */
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#define M_BO_NA_1 7 /* bitstring of 32 bits */
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#define M_ME_NA_1 9 /* measured value, normalized value */
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#define M_ME_NB_1 11 /* measured value, scaled value */
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#define M_ME_NC_1 13 /* measured value, short floating point number */
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#define M_IT_NA_1 15 /* integrated totals */
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#define M_PS_NA_1 20 /* packed single-point information with status change detection */
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#define M_ME_ND_1 21 /* measured value, normalized value without quality descriptor */
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#define M_SP_TB_1 30 /* single-point information with time tag CP56Time2a */
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#define M_DP_TB_1 31 /* double-point information with time tag CP56Time2a */
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#define M_ST_TB_1 32 /* step position information with time tag CP56Time2a */
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#define M_BO_TB_1 33 /* bitstring of 32 bit with time tag CP56Time2a */
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#define M_ME_TD_1 34 /* measured value, normalized value with time tag CP56Time2a */
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#define M_ME_TE_1 35 /* measured value, scaled value with time tag CP56Time2a */
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#define M_ME_TF_1 36 /* measured value, short floating point number with time tag CP56Time2a */
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#define M_IT_TB_1 37 /* integrated totals with time tag CP56Time2a */
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#define M_EP_TD_1 38 /* event of protection equipment with time tag CP56Time2a */
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#define M_EP_TE_1 39 /* packed start events of protection equipment with time tag CP56Time2a */
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#define M_EP_TF_1 40 /* packed output circuit information of protection equipment with time tag CP56Time2a */
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#define C_SC_NA_1 45 /* single command */
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#define C_DC_NA_1 46 /* double command */
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#define C_RC_NA_1 47 /* regulating step command */
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#define C_SE_NA_1 48 /* set point command, normalized value */
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#define C_SE_NB_1 49 /* set point command, scaled value */
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#define C_SE_NC_1 50 /* set point command, short floating point number */
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#define C_BO_NA_1 51 /* bitstring of 32 bits */
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#define C_SC_TA_1 58 /* single command with time tag CP56Time2a */
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#define C_DC_TA_1 59 /* double command with time tag CP56Time2a */
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#define C_RC_TA_1 60 /* regulating step command with time tag CP56Time2a */
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#define C_SE_TA_1 61 /* set point command, normalized value with time tag CP56Time2a */
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#define C_SE_TB_1 62 /* set point command, scaled value with time tag CP56Time2a */
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#define C_SE_TC_1 63 /* set point command, short floating-point number with time tag CP56Time2a */
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#define C_BO_TA_1 64 /* bitstring of 32 bits with time tag CP56Time2a */
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#define M_EI_NA_1 70 /* end of initialization */
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#define C_IC_NA_1 100 /* interrogation command */
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#define C_CI_NA_1 101 /* counter interrogation command */
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#define C_RD_NA_1 102 /* read command */
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#define C_CS_NA_1 103 /* clock synchronization command */
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#define C_RP_NA_1 105 /* reset process command */
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#define C_TS_TA_1 107 /* test command with time tag CP56Time2a */
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#define P_ME_NA_1 110 /* parameter of measured value, normalized value */
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#define P_ME_NB_1 111 /* parameter of measured value, scaled value */
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#define P_ME_NC_1 112 /* parameter of measured value, short floating-point number */
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#define P_AC_NA_1 113 /* parameter activation */
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#define F_FR_NA_1 120 /* file ready */
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#define F_SR_NA_1 121 /* section ready */
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#define F_SC_NA_1 122 /* call directory, select file, call file, call section */
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#define F_LS_NA_1 123 /* last section, last segment */
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#define F_AF_NA_1 124 /* ack file, ack section */
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#define F_SG_NA_1 125 /* segment */
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#define F_DR_TA_1 126 /* directory */
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#define F_SC_NB_1 127 /* Query Log - Request archive file */
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static const value_string asdu_types [] = {
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{ M_SP_NA_1, "M_SP_NA_1" },
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{ M_DP_NA_1, "M_DP_NA_1" },
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{ M_ST_NA_1, "M_ST_NA_1" },
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{ M_BO_NA_1, "M_BO_NA_1" },
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{ M_ME_NA_1, "M_ME_NA_1" },
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{ M_ME_NB_1, "M_ME_NB_1" },
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{ M_ME_NC_1, "M_ME_NC_1" },
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{ M_IT_NA_1, "M_IT_NA_1" },
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{ M_PS_NA_1, "M_PS_NA_1" },
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{ M_ME_ND_1, "M_ME_ND_1" },
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{ M_SP_TB_1, "M_SP_TB_1" },
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{ M_DP_TB_1, "M_DP_TB_1" },
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{ M_ST_TB_1, "M_ST_TB_1" },
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{ M_BO_TB_1, "M_BO_TB_1" },
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{ M_ME_TD_1, "M_ME_TD_1" },
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{ M_ME_TE_1, "M_ME_TE_1" },
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{ M_ME_TF_1, "M_ME_TF_1" },
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{ M_IT_TB_1, "M_IT_TB_1" },
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{ M_EP_TD_1, "M_EP_TD_1" },
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{ M_EP_TE_1, "M_EP_TE_1" },
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{ M_EP_TF_1, "M_EP_TF_1" },
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{ C_SC_NA_1, "C_SC_NA_1" },
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{ C_DC_NA_1, "C_DC_NA_1" },
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{ C_RC_NA_1, "C_RC_NA_1" },
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{ C_SE_NA_1, "C_SE_NA_1" },
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{ C_SE_NB_1, "C_SE_NB_1" },
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{ C_SE_NC_1, "C_SE_NC_1" },
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{ C_BO_NA_1, "C_BO_NA_1" },
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{ C_SC_TA_1, "C_SC_TA_1" },
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{ C_DC_TA_1, "C_DC_TA_1" },
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{ C_RC_TA_1, "C_RC_TA_1" },
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{ C_SE_TA_1, "C_SE_TA_1" },
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{ C_SE_TB_1, "C_SE_TB_1" },
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{ C_SE_TC_1, "C_SE_TC_1" },
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{ C_BO_TA_1, "C_BO_TA_1" },
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{ M_EI_NA_1, "M_EI_NA_1" },
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{ C_IC_NA_1, "C_IC_NA_1" },
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{ C_CI_NA_1, "C_CI_NA_1" },
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{ C_RD_NA_1, "C_RD_NA_1" },
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{ C_CS_NA_1, "C_CS_NA_1" },
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{ C_RP_NA_1, "C_RP_NA_1" },
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{ C_TS_TA_1, "C_TS_TA_1" },
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{ P_ME_NA_1, "P_ME_NA_1" },
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{ P_ME_NB_1, "P_ME_NB_1" },
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{ P_ME_NC_1, "P_ME_NC_1" },
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{ P_AC_NA_1, "P_AC_NA_1" },
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{ F_FR_NA_1, "F_FR_NA_1" },
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{ F_SR_NA_1, "F_SR_NA_1" },
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{ F_SC_NA_1, "F_SC_NA_1" },
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{ F_LS_NA_1, "F_LS_NA_1" },
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{ F_AF_NA_1, "F_AF_NA_1" },
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{ F_SG_NA_1, "F_SG_NA_1" },
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{ F_DR_TA_1, "F_DR_TA_1" },
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{ F_SC_NB_1, "F_SC_NB_1" },
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{ 0, NULL }
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};
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static const value_string asdu_lngtypes [] = {
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{ M_SP_NA_1, "single-point information" },
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{ M_DP_NA_1, "double-point information" },
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{ M_ST_NA_1, "step position information" },
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{ M_BO_NA_1, "bitstring of 32 bits" },
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{ M_ME_NA_1, "measured value, normalized value" },
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{ M_ME_NB_1, "measured value, scaled value" },
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{ M_ME_NC_1, "measured value, short floating point number" },
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{ M_IT_NA_1, "integrated totals" },
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{ M_PS_NA_1, "packed single-point information with status change detection" },
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{ M_ME_ND_1, "measured value, normalized value without quality descriptor" },
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{ M_SP_TB_1, "single-point information with time tag CP56Time2a" },
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{ M_DP_TB_1, "double-point information with time tag CP56Time2a" },
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{ M_ST_TB_1, "step position information with time tag CP56Time2a" },
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{ M_BO_TB_1, "bitstring of 32 bit with time tag CP56Time2a" },
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{ M_ME_TD_1, "measured value, normalized value with time tag CP56Time2a" },
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{ M_ME_TE_1, "measured value, scaled value with time tag CP56Time2a" },
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{ M_ME_TF_1, "measured value, short floating point number with time tag CP56Time2a" },
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{ M_IT_TB_1, "integrated totals with time tag CP56Time2a" },
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{ M_EP_TD_1, "event of protection equipment with time tag CP56Time2a" },
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{ M_EP_TE_1, "packed start events of protection equipment with time tag CP56Time2a" },
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{ M_EP_TF_1, "packed output circuit information of protection equipment with time tag CP56Time2a" },
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{ C_SC_NA_1, "single command" },
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{ C_DC_NA_1, "double command" },
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{ C_RC_NA_1, "regulating step command" },
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{ C_SE_NA_1, "set point command, normalized value" },
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{ C_SE_NB_1, "set point command, scaled value" },
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{ C_SE_NC_1, "set point command, short floating point number" },
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{ C_BO_NA_1, "bitstring of 32 bits" },
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{ C_SC_TA_1, "single command with time tag CP56Time2a" },
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{ C_DC_TA_1, "double command with time tag CP56Time2a" },
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{ C_RC_TA_1, "regulating step command with time tag CP56Time2a" },
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{ C_SE_TA_1, "set point command, normalized value with time tag CP56Time2a" },
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{ C_SE_TB_1, "set point command, scaled value with time tag CP56Time2a" },
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{ C_SE_TC_1, "set point command, short floating-point number with time tag CP56Time2a" },
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{ C_BO_TA_1, "bitstring of 32 bits with time tag CP56Time2a" },
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{ M_EI_NA_1, "end of initialization" },
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{ C_IC_NA_1, "interrogation command" },
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{ C_CI_NA_1, "counter interrogation command" },
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{ C_RD_NA_1, "read command" },
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{ C_CS_NA_1, "clock synchronization command" },
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{ C_RP_NA_1, "reset process command" },
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{ C_TS_TA_1, "test command with time tag CP56Time2a" },
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{ P_ME_NA_1, "parameter of measured value, normalized value" },
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{ P_ME_NB_1, "parameter of measured value, scaled value" },
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{ P_ME_NC_1, "parameter of measured value, short floating-point number" },
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{ P_AC_NA_1, "parameter activation" },
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{ F_FR_NA_1, "file ready" },
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{ F_SR_NA_1, "section ready" },
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{ F_SC_NA_1, "call directory, select file, call file, call section" },
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{ F_LS_NA_1, "last section, last segment" },
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{ F_AF_NA_1, "ack file, ack section" },
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{ F_SG_NA_1, "segment" },
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{ F_DR_TA_1, "directory" },
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{ F_SC_NB_1, "Query Log - Request archive file" },
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{ 0, NULL }
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};
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/* Cause of Transmision (CauseTx) */
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#define Per_Cyc 1
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#define Back 2
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#define Spont 3
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#define Init 4
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#define Req 5
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#define Act 6
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#define ActCon 7
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#define Deact 8
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#define DeactCon 9
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#define ActTerm 10
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#define Retrem 11
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#define Retloc 12
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#define File 13
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#define Inrogen 20
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#define Inro1 21
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#define Inro2 22
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#define Inro3 23
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#define Inro4 24
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#define Inro5 25
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#define Inro6 26
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#define Inro7 27
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#define Inro8 28
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#define Inro9 29
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#define Inro10 30
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#define Inro11 31
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#define Inro12 32
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#define Inro13 33
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#define Inro14 34
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#define Inro15 35
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#define Inro16 36
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#define Reqcogen 37
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#define Reqco1 38
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#define Reqco2 39
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#define Reqco3 40
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#define Reqco4 41
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#define UkTypeId 44
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#define UkCauseTx 45
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#define UkComAdrASDU 46
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#define UkIOA 47
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static const value_string causetx_types [] = {
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{ Per_Cyc ,"Per/Cyc" },
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{ Back ,"Back" },
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{ Spont ,"Spont" },
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{ Init ,"Init" },
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{ Req ,"Req" },
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{ Act ,"Act" },
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{ ActCon ,"ActCon" },
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{ Deact ,"Deact" },
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{ DeactCon ,"DeactCon" },
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{ ActTerm ,"ActTerm" },
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{ Retrem ,"Retrem" },
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{ Retloc ,"Retloc" },
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{ File ,"File" },
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{ Inrogen ,"Inrogen" },
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{ Inro1 ,"Inro1" },
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{ Inro2 ,"Inro2" },
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{ Inro3 ,"Inro3" },
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{ Inro4 ,"Inro4" },
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{ Inro5 ,"Inro5" },
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{ Inro6 ,"Inro6" },
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{ Inro7 ,"Inro7" },
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{ Inro8 ,"Inro8" },
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{ Inro9 ,"Inro9" },
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{ Inro10 ,"Inro10" },
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{ Inro11 ,"Inro11" },
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{ Inro12 ,"Inro12" },
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{ Inro13 ,"Inro13" },
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{ Inro14 ,"Inro14" },
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{ Inro15 ,"Inro15" },
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{ Inro16 ,"Inro16" },
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{ Reqcogen ,"Reqcogen" },
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{ Reqco1 ,"Reqco1" },
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{ Reqco2 ,"Reqco2" },
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{ Reqco3 ,"Reqco3" },
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{ Reqco4 ,"Reqco4" },
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{ UkTypeId ,"UkTypeId" },
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{ UkCauseTx ,"UkCauseTx" },
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{ UkComAdrASDU ,"UkComAdrASDU" },
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{ UkIOA ,"UkIOA" },
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{ 0, NULL }
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};
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/* Protocol fields to be filtered */
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static int hf_apdulen = -1;
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static int hf_apcitype = -1;
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static int hf_apciutype = -1;
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static int hf_addr = -1;
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static int hf_oa = -1;
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static int hf_typeid = -1;
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static int hf_causetx = -1;
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static int hf_nega = -1;
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static int hf_test = -1;
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static int hf_ioa = -1;
|
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static int hf_numix = -1;
|
||
static int hf_sq = -1;
|
||
|
||
|
||
static gint ett_apci = -1;
|
||
static gint ett_asdu = -1;
|
||
|
||
|
||
/* Find the APDU 104 (APDU=APCI+ASDU) length.
|
||
Includes possible tvb_length-1 bytes that don't form an APDU */
|
||
static guint get_iec104apdu_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset)
|
||
{
|
||
guint8 Val;
|
||
guint32 Off;
|
||
|
||
for (Off= 0; Off <= tvb_length(tvb)- 2; Off++) {
|
||
Val = tvb_get_guint8(tvb, offset+ Off);
|
||
if (Val == APCI_START) {
|
||
return (guint)(Off+ tvb_get_guint8(tvb, offset+ Off+ 1)+ 2);
|
||
}
|
||
}
|
||
|
||
return (guint)(tvb_length(tvb));
|
||
}
|
||
|
||
|
||
/* Is is called twice: For 'Packet List' and for 'Packet Details' */
|
||
static void dissect_iec104asdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
||
{
|
||
guint8 Len = tvb_length(tvb); /* Investigate also: 'reported Length' */
|
||
guint8 Bytex = 0;
|
||
guint8 Ind = 0;
|
||
struct asduheader * asduh;
|
||
char * res = NULL;
|
||
proto_item * it104 = NULL;
|
||
proto_tree * trHead;
|
||
|
||
if (!(check_col(pinfo->cinfo, COL_INFO) || tree)) return; /* Be sure that the function is only called twice */
|
||
|
||
asduh = ep_alloc(sizeof(struct asduheader));
|
||
res = ep_alloc(MAXS);
|
||
res[0] = '\0';
|
||
|
||
if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
|
||
col_set_str(pinfo->cinfo, COL_PROTOCOL, "104asdu");
|
||
}
|
||
if (check_col(pinfo->cinfo, COL_INFO)) {
|
||
col_clear(pinfo->cinfo, COL_INFO);
|
||
}
|
||
|
||
/*** *** START: Common to 'Packet List' and 'Packet Details' *** ***/
|
||
if (Len >= ASDU_HEAD_LEN) {
|
||
/* Get fields */
|
||
asduh->AddrLow = tvb_get_guint8(tvb, 4);
|
||
asduh->AddrHigh = tvb_get_guint8(tvb, 5);
|
||
asduh->OA = tvb_get_guint8(tvb, 3);
|
||
asduh->TypeId = tvb_get_guint8(tvb, 0);
|
||
asduh->TNCause = tvb_get_guint8(tvb, 2);
|
||
asduh->IOA = tvb_get_letoh24(tvb, 6);
|
||
Bytex = tvb_get_guint8(tvb, 1);
|
||
asduh->NumIx = Bytex & 0x7F;
|
||
asduh->SQ = Bytex & F_SQ;
|
||
/* Build common string for 'Packet List' and 'Packet Details' */
|
||
g_snprintf(res, MAXS, "%u,%u%s%u ", asduh->AddrLow, asduh->AddrHigh, pinfo->srcport == iec104port ? "–>" : "<–", asduh->OA);
|
||
g_strlcat(res, val_to_str(asduh->TypeId, asdu_types, "<TypeId=%u>"), MAXS);
|
||
g_strlcat(res, " ", MAXS);
|
||
g_strlcat(res, val_to_str(asduh->TNCause & F_CAUSE, causetx_types, " <CauseTx=%u>"), MAXS);
|
||
if (asduh->TNCause & F_NEGA) g_strlcat(res, "_NEGA", MAXS);
|
||
if (asduh->TNCause & F_TEST) g_strlcat(res, "_TEST", MAXS);
|
||
if (asduh->TNCause & (F_TEST | F_NEGA)) {
|
||
Bytex = val_to_strlen(asduh->TNCause & F_CAUSE, causetx_types);
|
||
for (Ind=Bytex; Ind< 7; Ind++) g_strlcat(res, " ", MAXS);
|
||
}
|
||
g_snprintf(res+strlen(res), MAXS-strlen(res), " IOA=%d", asduh->IOA);
|
||
if (asduh->NumIx > 1) {
|
||
if (asduh->SQ == F_SQ) g_snprintf(res+strlen(res), MAXS-strlen(res), "-%d", asduh->IOA+ asduh->NumIx- 1);
|
||
else g_strlcat(res, ",...", MAXS);
|
||
g_snprintf(res+strlen(res), MAXS-strlen(res), " (%u)", asduh->NumIx);
|
||
}
|
||
}
|
||
else {
|
||
g_snprintf(res, MAXS, "<ERR Short Asdu, Len=%u>", Len);
|
||
}
|
||
g_strlcat(res, " ", MAXS); /* We add an space to separate possible APCIs/ASDUs in the same packet */
|
||
/*** *** END: Common to 'Packet List' and 'Packet Details' *** ***/
|
||
|
||
/*** *** DISSECT 'Packet List' *** ***/
|
||
if (check_col(pinfo->cinfo, COL_INFO)) {
|
||
col_add_str(pinfo->cinfo, COL_INFO, res);
|
||
col_set_fence(pinfo->cinfo, COL_INFO);
|
||
}
|
||
|
||
if(!tree) return;
|
||
|
||
/*** *** DISSECT 'Packet Details' *** ***/
|
||
|
||
it104 = proto_tree_add_item(tree, proto_iec104asdu, tvb, 0, -1, FALSE);
|
||
|
||
/* 'Packet Details': ROOT ITEM */
|
||
proto_item_append_text(it104, ": %s'%s'", res, Len >= ASDU_HEAD_LEN ? val_to_str(asduh->TypeId, asdu_lngtypes, "<Unknown TypeId>") : "");
|
||
|
||
/* 'Packet Details': TREE */
|
||
if (Len < ASDU_HEAD_LEN) return;
|
||
trHead = proto_item_add_subtree(it104, ett_asdu);
|
||
|
||
/* Remember: add_uint, add_boolean, _add_text: value from last parameter.
|
||
add_item: value from tvb. */
|
||
proto_tree_add_uint(trHead, hf_typeid, tvb, 0, 1, asduh->TypeId);
|
||
proto_tree_add_uint(trHead, hf_numix, tvb, 1, 1, asduh->NumIx);
|
||
proto_tree_add_uint(trHead, hf_causetx, tvb, 2, 1, asduh->TNCause & F_CAUSE);
|
||
proto_tree_add_boolean(trHead, hf_nega, tvb, 2, 1, asduh->TNCause);
|
||
proto_tree_add_boolean(trHead, hf_test, tvb, 2, 1, asduh->TNCause);
|
||
proto_tree_add_uint(trHead, hf_oa, tvb, 3, 1, asduh->OA);
|
||
proto_tree_add_uint(trHead, hf_addr, tvb, 4, 2, asduh->AddrLow+ 256* asduh->AddrHigh);
|
||
proto_tree_add_uint(trHead, hf_ioa, tvb, 6, 3, asduh->IOA);
|
||
if (asduh->NumIx > 1) proto_tree_add_boolean(trHead, hf_sq, tvb, 1, 1, asduh->SQ);
|
||
}
|
||
|
||
|
||
|
||
/* Is is called twice: For 'Packet List' and for 'Packet Details' */
|
||
static void dissect_iec104apci(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
||
{
|
||
guint8 TcpLen = tvb_length(tvb);
|
||
guint16 Brossa = 0;
|
||
guint8 Start;
|
||
guint8 Off;
|
||
guint8 Byte1 = 0;
|
||
struct apciheader * apcih;
|
||
char * res = NULL;
|
||
proto_item * it104 = NULL;
|
||
proto_tree * trHead;
|
||
|
||
if (!(check_col(pinfo->cinfo, COL_INFO) || tree)) return; /* Be sure that the function is only called twice */
|
||
|
||
apcih = ep_alloc(sizeof(struct apciheader));
|
||
res = ep_alloc(MAXS);
|
||
res[0] = '\0';
|
||
|
||
if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
|
||
col_set_str(pinfo->cinfo, COL_PROTOCOL, "104apci");
|
||
}
|
||
if (check_col(pinfo->cinfo, COL_INFO)) {
|
||
col_clear(pinfo->cinfo, COL_INFO);
|
||
}
|
||
|
||
/*** *** START: Common to 'Packet List' and 'Packet Details' *** ***/
|
||
Start = 0;
|
||
for (Off= 0; Off <= TcpLen- 2; Off++) {
|
||
Start = tvb_get_guint8(tvb, Off);
|
||
if (Start == APCI_START) {
|
||
Brossa = Off;
|
||
apcih->ApduLen = tvb_get_guint8(tvb, Off+ 1);
|
||
if (apcih->ApduLen >= APDU_MIN_LEN) {
|
||
Byte1 = tvb_get_guint8(tvb, Off+ 2);
|
||
apcih->Type = Byte1 & 0x03;
|
||
/* Type I is only lowest bit set to 0 */
|
||
if (apcih->Type == 2) apcih->Type = 0;
|
||
switch(apcih->Type) {
|
||
case I_TYPE:
|
||
apcih->Tx = tvb_get_letohs(tvb, Off+ 2) >> 1;
|
||
case S_TYPE:
|
||
apcih->Rx = tvb_get_letohs(tvb, Off+ 4) >> 1;
|
||
break;
|
||
case U_TYPE:
|
||
apcih->UType = (Byte1 & 0xFC); /* Don't shift */
|
||
break;
|
||
}
|
||
}
|
||
else {
|
||
/* WireShark can crash if we process packets with length less than expected (6). We consider that everything is bad */
|
||
Brossa = TcpLen;
|
||
}
|
||
/* Don't search more the APCI_START */
|
||
break;
|
||
}
|
||
}
|
||
if (Start != APCI_START) {
|
||
/* Everything is bad (no APCI found) */
|
||
Brossa = TcpLen;
|
||
}
|
||
/* Construir string comu a List i Details */
|
||
if (Brossa > 0) g_snprintf(res, MAXS, "<ERR %u bytes> ", Brossa);
|
||
if (Brossa != TcpLen) {
|
||
if (apcih->ApduLen <= APDU_MAX_LEN) {
|
||
/* APCI in 'Paquet List' */
|
||
g_snprintf(res+strlen(res), MAXS-strlen(res), "%s%s(", pinfo->srcport == iec104port ? "–>" : "<–", val_to_str(apcih->Type, apci_types, "<ERR>"));
|
||
switch(apcih->Type) { /* APCI in 'Packet List' */
|
||
case I_TYPE:
|
||
g_snprintf(res+strlen(res), MAXS-strlen(res), "%d,", apcih->Tx);
|
||
case S_TYPE:
|
||
g_snprintf(res+strlen(res), MAXS-strlen(res), "%d)", apcih->Rx);
|
||
/* Align first packets */
|
||
if (apcih->Tx < 10) g_strlcat(res, " ", MAXS);
|
||
if (apcih->Rx < 10) g_strlcat(res, " ", MAXS);
|
||
break;
|
||
case U_TYPE:
|
||
g_snprintf(res+strlen(res), MAXS-strlen(res), "%s)", val_to_str(apcih->UType >> 2, u_types, "<ERR>"));
|
||
break;
|
||
}
|
||
if (apcih->Type != I_TYPE && apcih->ApduLen > APDU_MIN_LEN) g_snprintf(res+strlen(res), MAXS-strlen(res), "<ERR %u bytes> ", apcih->ApduLen- APDU_MIN_LEN);
|
||
}
|
||
else {
|
||
g_snprintf(res+strlen(res), MAXS-strlen(res), "<ERR ApduLen=%u bytes> ", apcih->ApduLen);
|
||
}
|
||
}
|
||
g_strlcat(res, " ", MAXS); /* We add an space to separate possible APCIs/ASDUs in the same packet */
|
||
/*** *** END: Common to 'Packet List' and 'Packet Details' *** ***/
|
||
|
||
/*** *** Dissect 'Packet List' *** ***/
|
||
if (check_col(pinfo->cinfo, COL_INFO)) {
|
||
col_add_str(pinfo->cinfo, COL_INFO, res);
|
||
if(apcih->Type == I_TYPE && Brossa != TcpLen) {
|
||
call_dissector(iec104asdu_handle, tvb_new_subset(tvb, Off+ APCI_LEN, -1, apcih->ApduLen- APCI_LEN), pinfo, tree);
|
||
} else {
|
||
col_set_fence(pinfo->cinfo, COL_INFO);
|
||
}
|
||
}
|
||
|
||
if(!tree) return;
|
||
|
||
/*** *** DISSECT 'Packet Details' *** ***/
|
||
|
||
it104 = proto_tree_add_item(tree, proto_iec104apci, tvb, 0, Off+ APCI_LEN, FALSE);
|
||
|
||
/* 'Packet Details': ROOT ITEM */
|
||
proto_item_append_text(it104, ": %s", res);
|
||
|
||
if(Brossa == TcpLen) return;
|
||
|
||
/* Don't call ASDU dissector if it was called before */
|
||
if(apcih->Type == I_TYPE && (!check_col(pinfo->cinfo, COL_INFO))) call_dissector(iec104asdu_handle, tvb_new_subset(tvb, Off+ APCI_LEN, -1, apcih->ApduLen- APCI_LEN), pinfo, tree);
|
||
|
||
/* 'Packet Details': TREE */
|
||
trHead = proto_item_add_subtree(it104, ett_apci);
|
||
/* Remember: add_uint, add_boolean, _add_text: value from last parameter.
|
||
add_item: value from tvb. */
|
||
proto_tree_add_uint(trHead, hf_apdulen, tvb, Off+ 1, 1, apcih->ApduLen);
|
||
proto_tree_add_uint(trHead, hf_apcitype, tvb, Off+ 2, 1, apcih->Type);
|
||
switch(apcih->Type){
|
||
case U_TYPE:
|
||
proto_tree_add_uint(trHead, hf_apciutype, tvb, Off+ 2, 1, apcih->UType); /* Don't shift the value */
|
||
break;
|
||
}
|
||
|
||
}
|
||
|
||
|
||
|
||
|
||
static void dissect_iec104reas(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
||
{
|
||
/* 5th parameter = 6 = minimum bytes received to calculate the length. (Not 2 in order to find more APCIs in case of 'noisy' bytes between the APCIs) */
|
||
tcp_dissect_pdus(tvb, pinfo, tree, TRUE, APCI_LEN,
|
||
get_iec104apdu_len, dissect_iec104apci);
|
||
}
|
||
|
||
|
||
/* The protocol has two subprotocols: Register APCI */
|
||
void
|
||
proto_register_iec104apci(void)
|
||
{
|
||
|
||
static hf_register_info hf_ap[] = {
|
||
|
||
{ &hf_apdulen,
|
||
{ "ApduLen", "104apci.apdulen", FT_UINT8, BASE_DEC, NULL, 0x0,
|
||
"APDU Len", HFILL }},
|
||
|
||
{ &hf_apcitype,
|
||
{ "ApciType", "104apci.type", FT_UINT8, BASE_HEX, VALS(apci_types), 0x03,
|
||
"APCI type", HFILL }},
|
||
|
||
{ &hf_apciutype,
|
||
{ "ApciUType", "104apci.utype", FT_UINT8, BASE_HEX, VALS(u_types), 0xFC,
|
||
"Apci U type", HFILL }},
|
||
|
||
};
|
||
|
||
static gint *ett_ap[] = {
|
||
&ett_apci,
|
||
};
|
||
|
||
proto_iec104apci = proto_register_protocol(
|
||
"IEC 60870-5-104,Apci",
|
||
"104apci",
|
||
"104apci"
|
||
);
|
||
proto_register_field_array(proto_iec104apci, hf_ap, array_length(hf_ap));
|
||
proto_register_subtree_array(ett_ap, array_length(ett_ap));
|
||
|
||
}
|
||
|
||
|
||
/* The protocol has two subprotocols: Register ASDU */
|
||
void
|
||
proto_register_iec104asdu(void)
|
||
{
|
||
|
||
static hf_register_info hf_as[] = {
|
||
|
||
{ &hf_addr,
|
||
{ "Addr", "104asdu.addr", FT_UINT16, BASE_DEC, NULL, 0x0,
|
||
"Common Address of Asdu", HFILL }},
|
||
|
||
{ &hf_oa,
|
||
{ "OA ", "104asdu.oa", FT_UINT8, BASE_DEC, NULL, 0x0,
|
||
"Originator Address", HFILL }},
|
||
|
||
{ &hf_typeid,
|
||
{ "TypeId ", "104asdu.typeid", FT_UINT8, BASE_DEC, VALS(asdu_types), 0x0,
|
||
"Asdu Type Id", HFILL }},
|
||
|
||
{ &hf_causetx,
|
||
{ "CauseTx", "104asdu.causetx", FT_UINT8, BASE_DEC, VALS(causetx_types), 0x3F,
|
||
"Cause of Transmision", HFILL }},
|
||
|
||
{ &hf_nega,
|
||
{ "Negative", "104asdu.nega", FT_BOOLEAN, 8, NULL, F_NEGA,
|
||
"Negative", HFILL }},
|
||
|
||
{ &hf_test,
|
||
{ "Test", "104asdu.test", FT_BOOLEAN, 8, NULL, F_TEST,
|
||
"Test", HFILL }},
|
||
|
||
|
||
{ &hf_ioa,
|
||
{ "IOA ", "104asdu.ioa", FT_UINT24, BASE_DEC, NULL, 0x0,
|
||
"Information Object Address", HFILL }},
|
||
|
||
{ &hf_numix,
|
||
{ "NumIx", "104asdu.numix", FT_UINT8, BASE_DEC, NULL, 0x7F,
|
||
"Number of Information Objects/Elements", HFILL }},
|
||
|
||
{ &hf_sq,
|
||
{ "SQ", "104asdu.sq", FT_BOOLEAN, 8, NULL, F_SQ,
|
||
"Sequence", HFILL }},
|
||
|
||
};
|
||
|
||
static gint *ett_as[] = {
|
||
&ett_asdu,
|
||
};
|
||
|
||
proto_iec104asdu = proto_register_protocol(
|
||
"IEC 60870-5-104,Asdu",
|
||
"104asdu",
|
||
"104asdu"
|
||
);
|
||
proto_register_field_array(proto_iec104asdu, hf_as, array_length(hf_as));
|
||
proto_register_subtree_array(ett_as, array_length(ett_as));
|
||
|
||
}
|
||
|
||
|
||
|
||
/* The registration hand-off routine */
|
||
void
|
||
proto_reg_handoff_iec104(void)
|
||
{
|
||
static dissector_handle_t iec104apci_handle;
|
||
|
||
iec104apci_handle = create_dissector_handle(dissect_iec104reas, proto_iec104apci);
|
||
iec104asdu_handle = create_dissector_handle(dissect_iec104asdu, proto_iec104asdu);
|
||
|
||
dissector_add("tcp.port", iec104port, iec104apci_handle);
|
||
}
|
||
|