/* packet-sbus.c
* Routines for Ether-S-Bus dissection
* Copyright 2006, Christian Durrer <christian.durrer@sensemail.ch>
*
* $Id: packet-sbus.c 23057 2007-10-02 22:04:07Z sahlberg $
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <glib.h>
#include <gmodule.h>
#include <epan/packet.h>
#include <epan/prefs.h>
#include <epan/conversation.h>
/* Number of entries in the memeory chunk array (for conversation)*/
#define SBUS_MEMCHUNKSIZE 20
/* Attribut values*/
#define SBUS_REQUEST 0x00
#define SBUS_RESPONSE 0x01
#define SBUS_ACKNAK 0x02
/*SBus command codes*/
#define SBUS_RD_COUNTER 0x00
#define SBUS_RD_DISPLAY_REGISTER 0x01
#define SBUS_RD_FLAG 0x02
#define SBUS_RD_INPUT 0x03
#define SBUS_RD_RTC 0x04
#define SBUS_RD_OUTPUT 0x05
#define SBUS_RD_REGISTER 0x06
#define SBUS_RD_TIMER 0x07
#define SBUS_WR_COUNTER 0x0A
#define SBUS_WR_FLAG 0x0B
#define SBUS_WR_RTC 0x0C
#define SBUS_WR_OUTPUT 0x0D
#define SBUS_WR_REGISTER 0x0E
#define SBUS_WR_TIMER 0x0F
#define SBUS_RDWR_MULTI_MEDIAS 0x13
#define SBUS_RD_PCD_STATUS_CPU0 0x14
#define SBUS_RD_PCD_STATUS_CPU1 0x15
#define SBUS_RD_PCD_STATUS_CPU2 0x16
#define SBUS_RD_PCD_STATUS_CPU3 0x17
#define SBUS_RD_PCD_STATUS_CPU4 0x18
#define SBUS_RD_PCD_STATUS_CPU5 0x19
#define SBUS_RD_PCD_STATUS_CPU6 0x1A
#define SBUS_RD_PCD_STATUS_OWN 0x1B
#define SBUS_RD_SBUS_STN_NBR 0x1D
#define SBUS_RD_USER_MEMORY 0x1E
#define SBUS_RD_PROGRAM_LINE 0x1F
#define SBUS_RD_PROGRAM_VERSION 0x20
#define SBUS_RD_TEXT 0x21
#define SBUS_RD_ACTIVE_TRANSITION 0x22
#define SBUS_WR_USER_MEMORY 0x23
#define SBUS_WR_PROGRAM_LINE 0x24
#define SBUS_WR_TEXT 0x25
#define SBUS_RUN_PROCEDURE_CPU0 0x28
#define SBUS_RUN_PROCEDURE_CPU1 0x29
#define SBUS_RUN_PROCEDURE_CPU2 0x2A
#define SBUS_RUN_PROCEDURE_CPU3 0x2B
#define SBUS_RUN_PROCEDURE_CPU4 0x2C
#define SBUS_RUN_PROCEDURE_CPU5 0x2D
#define SBUS_RUN_PROCEDURE_CPU6 0x2E
#define SBUS_RUN_PROCEDURE_OWN 0x2F
#define SBUS_RUN_PROCEDURE_ALL 0x30
#define SBUS_RESTART_COLD_CPU1 0x32
#define SBUS_RESTART_COLD_CPU2 0x33
#define SBUS_RESTART_COLD_CPU3 0x34
#define SBUS_RESTART_COLD_CPU4 0x35
#define SBUS_RESTART_COLD_CPU5 0x36
#define SBUS_RESTART_COLD_CPU6 0x37
#define SBUS_RESTART_COLD_OWN 0x38
#define SBUS_RESTART_COLD_ALL 0x39
#define SBUS_STOP_PROCEDURE_CPU0 0x3C
#define SBUS_STOP_PROCEDURE_CPU1 0x3D
#define SBUS_STOP_PROCEDURE_CPU2 0x3E
#define SBUS_STOP_PROCEDURE_CPU3 0x3F
#define SBUS_STOP_PROCEDURE_CPU4 0x40
#define SBUS_STOP_PROCEDURE_CPU5 0x41
#define SBUS_STOP_PROCEDURE_CPU6 0x42
#define SBUS_STOP_PROCEDURE_OWN 0x43
#define SBUS_STOP_PROCEDURE_ALL 0x44
#define SBUS_RD_STATUSFLAG_ACCU 0x46
#define SBUS_RD_BYTE 0x47
#define SBUS_RD_HALT_FAILURE_REG 0x48
#define SBUS_RD_INDEX_REGISTER 0x49
#define SBUS_RD_INSTRUCTION_POINTER 0x4A
#define SBUS_FIND_HISTORY 0x4B
#define SBUS_WR_STATUSFLAG_ACCU 0x50
#define SBUS_WR_BYTE 0x51
#define SBUS_WR_INDEX_REGISTER 0x52
#define SBUS_WR_INSTRUCTION_POINTER 0x53
#define SBUS_CLEAR_ALL 0x5A
#define SBUS_CLEAR_FLAGS 0x5B
#define SBUS_CLEAR_OUTPUTS 0x5C
#define SBUS_CLEAR_REGISTERS 0x5D
#define SBUS_CLEAR_TIMERS 0x5E
#define SBUS_RESTART_WARM_CPU1 0x64
#define SBUS_RESTART_WARM_CPU2 0x65
#define SBUS_RESTART_WARM_CPU3 0x66
#define SBUS_RESTART_WARM_CPU4 0x67
#define SBUS_RESTART_WARM_CPU5 0x68
#define SBUS_RESTART_WARM_CPU6 0x69
#define SBUS_RESTART_WARM_OWN 0x6A
#define SBUS_RESTART_WARM_ALL 0x6B
#define SBUS_CHANGE_BLOCK 0x6E
#define SBUS_CLEAR_HISTORY_FAILURE 0x6F
#define SBUS_DELETE_PROGRAM_LINE 0x70
#define SBUS_GO_CONDITIONAL 0x71
#define SBUS_INSERT_PROGRAM_LINE 0x72
#define SBUS_LOCAL_CYCLE 0x73
#define SBUS_ALL_CYCLES 0x74
#define SBUS_MAKE_TEXT 0x75
#define SBUS_EXECUTE_SINGLE_INSTR 0x76
#define SBUS_SINGLE_STEP 0x77
#define SBUS_XOB_17_INTERRUPT 0x82
#define SBUS_XOB_18_INTERRUPT 0x83
#define SBUS_XOB_19_INTERRUPT 0x84
#define SBUS_RD_HANGUP_TIMEOUT 0x91
#define SBUS_RD_DATA_BLOCK 0x96
#define SBUS_WR_DATA_BLOCK 0x97
#define SBUS_MAKE_DATA_BLOCK 0x98
#define SBUS_CLEAR_DATA_BLOCK 0x99
#define SBUS_CLEAR_TEXT 0x9A
#define SBUS_RD_BLOCK_ADDRESSES 0x9B
#define SBUS_RD_BLOCK_SIZES 0x9C
#define SBUS_RD_CURRENT_BLOCK 0x9D
#define SBUS_RD_CALL_STACK 0x9E
#define SBUS_RD_DBX 0x9F
#define SBUS_RD_USER_EEPROM_REGISTER 0xA1
#define SBUS_WR_USER_EEPROM_REGISTER 0xA3
#define SBUS_ERASE_FLASH 0xA5
#define SBUS_RESTART_COLD_FLAG 0xA6
#define SBUS_WR_SYSTEM_BUFFER 0xA7
#define SBUS_RD_SYSTEM_BUFFER 0xA8
#define SBUS_RD_WR_PCD_BLOCK 0xA9
#define SBUS_GET_DIAGNOSTIC 0xAA
#define SBUS_RD_SYSTEM_INFORMATION 0xAB
#define SBUS_CHANGE_BLOCKS_ON_RUN 0xAC
#define SBUS_FLASHCARD_TELEGRAM 0xAD
#define SBUS_DOWNLOAD_FIRMWARE 0xAE
#define SBUS_WEB_SERVER_SERIAL_COMM 0xAF
/* Bitfield in the arithmetic flags and accu*/
#define F_ACCU (1<<0) /* Accumulator of PCD */
#define F_ERROR (1<<1) /* Error flag of PCD */
#define F_NEGATIVE (1<<2) /* Negative arithmetic status flag*/
#define F_ZERO (1<<3) /* Zero arithmetic status flag */
/* Bitfield in the system information*/
/*#define F_EMPTY (1<<0) always 0 */
#define F_MEMSIZE (1<<1) /* Memory size information*/
#define F_TRACE (1<<2) /* Trace buffer feature */
#define F_INFO_B1 (1<<3) /* EEPROM information of slot B1*/
#define F_INFO_B2 (1<<4) /* EEPROM information of slot B2*/
#define F_PGU_BAUD (1<<5) /* PGU baudrate can be switched*/
/* Forward declaration we need below */
void proto_reg_handoff_sbus(void);
/* Initialize the protocol and registered fields */
static int proto_sbus = -1;
static int hf_sbus_length = -1;
static int hf_sbus_version = -1;
static int hf_sbus_protocol = -1;
static int hf_sbus_sequence = -1;
static int hf_sbus_attribut = -1;
static int hf_sbus_dest = -1;
static int hf_sbus_address = -1;
static int hf_sbus_command = -1;
static int hf_sbus_command_extension = -1;
static int hf_sbus_rcount = -1;
static int hf_sbus_wcount = -1;
static int hf_sbus_wcount_calculated = -1;
static int hf_sbus_fio_count = -1;
static int hf_sbus_addr_rtc = -1;
static int hf_sbus_addr_iof = -1;
static int hf_sbus_addr_eeprom = -1;
static int hf_sbus_addr_prog = -1;
static int hf_sbus_addr_68k = -1;
static int hf_sbus_block_type = -1;
static int hf_sbus_block_nr = -1;
static int hf_sbus_nbr_elements = -1;
static int hf_sbus_display_register = -1;
static int hf_sbus_data_rtc = -1;
static int hf_sbus_data_byte = -1;
static int hf_sbus_data_byte_hex = -1;
static int hf_sbus_data_iof = -1;
static int hf_sbus_cpu_type = -1;
static int hf_sbus_fw_version = -1;
static int hf_sbus_sysinfo_nr = -1;
static int hf_sbus_sysinfo0_1 = -1;
static int hf_sbus_sysinfo0_2 = -1;
static int hf_sbus_sysinfo0_3 = -1;
static int hf_sbus_sysinfo0_4 = -1;
static int hf_sbus_sysinfo0_5 = -1;
static int hf_sbus_sysinfo_length = -1;
static int hf_sbus_f_module_type = -1;
static int hf_sbus_harware_version = -1;
static int hf_sbus_hardware_modification = -1;
static int hf_sbus_various = -1;
static int hf_sbus_acknackcode = -1;
static int hf_sbus_cpu_status = -1;
static int hf_sbus_week_day = -1;
static int hf_sbus_date = -1;
static int hf_sbus_time = -1;
static int hf_sbus_crc = -1;
static int hf_sbus_crc_bad = -1;
static int hf_sbus_flags_accu = -1;
static int hf_sbus_flags_error = -1;
static int hf_sbus_flags_negative = -1;
static int hf_sbus_flags_zero = -1;
/* Web server telegram */
static int hf_sbus_web_size = -1;
static int hf_sbus_web_aid = -1;
static int hf_sbus_web_seq = -1;
/* Initialize the subtree pointers */
static gint ett_sbus = -1;
static gint ett_sbus_ether = -1;
static gint ett_sbus_data = -1;
/* True/False strings*/
static const true_false_string tfs_sbus_flags= {
"Is high",
"Is low"
};
static const true_false_string tfs_sbus_present= {
"Is present",
"Is not present"
};
/* value to string definitions*/
/* telegram types*/
static const value_string sbus_att_vals[] = {
{0, "Request"},
{1, "Response"},
{2, "ACK/NAK"},
{0, NULL}
};
/* Block types*/
static const value_string sbus_block_types[] = {
{0x00, "COB"},
{0x01, "XOB"},
{0x02, "PB"},
{0x03, "FB"},
{0x04, "ST"},
{0x05, "TR"},
{0x04, "TEXT"},
{0x05, "DB"},
{0x08, "SB"},
{0, NULL}
};
/* ACK NAK values*/
static const value_string sbus_CPU_status[] = {
{0x43, "C"},
{0x44, "D"},
{0x48, "Halt"},
{0x52, "Run"},
{0x53, "Stop"},
{0x58, "X, Exceptional Intermediate Status (MODEMS+)"},
{0, NULL}
};
/* CPU status*/
static const value_string sbus_ack_nak_vals[] = {
{0, "ACK (Acknowledged)"},
{1, "NAK, no reason specified"},
{2, "NAK, because of password"},
{3, "NAK, PGU port is in reduced protocol"},
{4, "NAK, PGU port is already used"},
{0, NULL}
};
/* S-Bus commands*/
static const value_string sbus_command_vals[] = {
{0x00, "Read counter(s)"},
{0x01, "Read display register"},
{0x02, "Read flag(s)"},
{0x03, "Read input(s)"},
{0x04, "Read real time clock"},
{0x05, "Read output(s)"},
{0x06, "Read register(s)"},
{0x07, "Read timer(s)"},
{0x0A, "Write counter(s)"},
{0x0B, "Write flag(s)"},
{0x0C, "Write real time clock"},
{0x0D, "Write output(s)"},
{0x0E, "Write register(s)"},
{0x0F, "Write timer(s)"},
{0x14, "Read PCD status, CPU 0"},
{0x15, "Read PCD status, CPU 1"},
{0x16, "Read PCD status, CPU 2"},
{0x17, "Read PCD status, CPU 3"},
{0x18, "Read PCD status, CPU 4"},
{0x19, "Read PCD status, CPU 5"},
{0x1A, "Read PCD status, CPU 6"},
{0x1B, "Read PCD status (own)"},
{0x1D, "Read S-Bus station number"},
{0x1E, "Read user memory*"},
{0x1F, "Read program line*"},
{0x20, "Read firmware version"},
{0x21, "Read text*"},
{0x22, "Read active transition*"},
{0x23, "Write user memeory*"},
{0x24, "Write program line*"},
{0x25, "Write text*"},
{0x28, "Run procedure*, CPU 0"},
{0x29, "Run procedure*, CPU 1"},
{0x2A, "Run procedure*, CPU 2"},
{0x2B, "Run procedure*, CPU 3"},
{0x2C, "Run procedure*, CPU 4"},
{0x2D, "Run procedure*, CPU 5"},
{0x2E, "Run procedure*, CPU 6"},
{0x2F, "Run procedure* (own CPU)"},
{0x30, "Run procedure* (All CPUs)"},
{0x32, "Restart cold CPU 1*"},
{0x33, "Restart cold CPU 2*"},
{0x34, "Restart cold CPU 3*"},
{0x35, "Restart cold CPU 4*"},
{0x36, "Restart cold CPU 5*"},
{0x37, "Restart cold CPU 6*"},
{0x38, "Restart cold own CPU*"},
{0x39, "Restart cold all CPUs*"},
{0x3C, "Stop procedure*, CPU 0"},
{0x3D, "Stop procedure*, CPU 1"},
{0x3E, "Stop procedure*, CPU 2"},
{0x3F, "Stop procedure*, CPU 3"},
{0x40, "Stop procedure*, CPU 4"},
{0x41, "Stop procedure*, CPU 5"},
{0x42, "Stop procedure*, CPU 6"},
{0x43, "Stop procedure*, (own CPU)"},
{0x44, "Stop procedure*, (All CPUs)"},
{0x46, "Read arithmetic status and ACCU*"},
{0x47, "Read byte"},
{0x48, "Read halt failure register*"},
{0x49, "Read index register*"},
{0x4A, "Read instruction pointer*"},
{0x4B, "Find history*"},
{0x50, "Write arithmetic staus and ACCU*"},
{0x51, "Write byte*"},
{0x52, "Write index register"},
{0x53, "Write instruction pointer*"},
{0x5A, "Clear all (F, O, R, T)*"},
{0x5B, "Clear flags*"},
{0x5C, "Clear outputs*"},
{0x5D, "Clear registers*"},
{0x5E, "Clear timers*"},
{0x64, "Restart warm CPU 1*"},
{0x65, "Restart warm CPU 2*"},
{0x66, "Restart warm CPU 3*"},
{0x67, "Restart warm CPU 4*"},
{0x68, "Restart warm CPU 5*"},
{0x69, "Restart warm CPU 6*"},
{0x6A, "Restart warm (own CPU)*"},
{0x6B, "Restart warm (All CPUs)*"},
{0x6E, "Change block*"},
{0x6F, "Clear history failure*"},
{0x70, "Delete program line*"},
{0x71, "Go conditional*"},
{0x72, "Insert program line*"},
{0x73, "Local cycles*"},
{0x74, "All cycles*"},
{0x75, "Make text*"},
{0x76, "Execute single instruction*"},
{0x77, "Single step*"},
{0x82, "XOB 17 interrupt"},
{0x83, "XOB 18 interrupt"},
{0x84, "XOB 19 interrupt"},
{0x91, "Read hangup timeout"},
{0x96, "Read data block"},
{0x97, "Write data block"},
{0x98, "Make data block*"},
{0x99, "Clear data block*"},
{0x9A, "Clear text*"},
{0x9B, "Read block address"},
{0x9C, "Read block sizes"},
{0x9D, "Read current block*"},
{0x9E, "Read call stack*"},
{0x9F, "Read DBX"},
{0xA1, "Read user EEPROM register"},
{0xA3, "Write user EEPROM register"},
{0xA5, "Erase flash*"},
{0xA6, "Restart cold flag*"},
{0xA7, "Write system buffer"},
{0xA8, "Read system buffer"},
{0xAA, "Get diagnostic*"},
{0xAB, "Read system information*"},
{0xAC, "Changes blocks on run*"},
{0xAD, "Flashcard telegram*"},
{0xAE, "Download FW*"},
{0xAF, "Web server serial communication*"},
{0, NULL}
};
static const value_string webserver_aid_vals[] = {
{0x01, "Partitial request"},
{0x02, "Request end"},
{0x07, "Get Data"},
{0x10, "Transfer OK"},
{0x11, "Partial answer"},
{0x12, "Last part of answer"},
{0x13, "Server not ready"},
{0, NULL}
};
static const guint crc_table[] = {
0x0000,0x1021,0x2042,0x3063,0x4084,0x50a5,0x60c6,0x70e7,0x8108,0x9129,0xa14a,0xb16b,0xc18c,0xd1ad,0xe1ce,0xf1ef,
0x1231,0x0210,0x3273,0x2252,0x52b5,0x4294,0x72f7,0x62d6,0x9339,0x8318,0xb37b,0xa35a,0xd3bd,0xc39c,0xf3ff,0xe3de,
0x2462,0x3443,0x0420,0x1401,0x64e6,0x74c7,0x44a4,0x5485,0xa56a,0xb54b,0x8528,0x9509,0xe5ee,0xf5cf,0xc5ac,0xd58d,
0x3653,0x2672,0x1611,0x0630,0x76d7,0x66f6,0x5695,0x46b4,0xb75b,0xa77a,0x9719,0x8738,0xf7df,0xe7fe,0xd79d,0xc7bc,
0x48c4,0x58e5,0x6886,0x78a7,0x0840,0x1861,0x2802,0x3823,0xc9cc,0xd9ed,0xe98e,0xf9af,0x8948,0x9969,0xa90a,0xb92b,
0x5af5,0x4ad4,0x7ab7,0x6a96,0x1a71,0x0a50,0x3a33,0x2a12,0xdbfd,0xcbdc,0xfbbf,0xeb9e,0x9b79,0x8b58,0xbb3b,0xab1a,
0x6ca6,0x7c87,0x4ce4,0x5cc5,0x2c22,0x3c03,0x0c60,0x1c41,0xedae,0xfd8f,0xcdec,0xddcd,0xad2a,0xbd0b,0x8d68,0x9d49,
0x7e97,0x6eb6,0x5ed5,0x4ef4,0x3e13,0x2e32,0x1e51,0x0e70,0xff9f,0xefbe,0xdfdd,0xcffc,0xbf1b,0xaf3a,0x9f59,0x8f78,
0x9188,0x81a9,0xb1ca,0xa1eb,0xd10c,0xc12d,0xf14e,0xe16f,0x1080,0x00a1,0x30c2,0x20e3,0x5004,0x4025,0x7046,0x6067,
0x83b9,0x9398,0xa3fb,0xb3da,0xc33d,0xd31c,0xe37f,0xf35e,0x02b1,0x1290,0x22f3,0x32d2,0x4235,0x5214,0x6277,0x7256,
0xb5ea,0xa5cb,0x95a8,0x8589,0xf56e,0xe54f,0xd52c,0xc50d,0x34e2,0x24c3,0x14a0,0x0481,0x7466,0x6447,0x5424,0x4405,
0xa7db,0xb7fa,0x8799,0x97b8,0xe75f,0xf77e,0xc71d,0xd73c,0x26d3,0x36f2,0x0691,0x16b0,0x6657,0x7676,0x4615,0x5634,
0xd94c,0xc96d,0xf90e,0xe92f,0x99c8,0x89e9,0xb98a,0xa9ab,0x5844,0x4865,0x7806,0x6827,0x18c0,0x08e1,0x3882,0x28a3,
0xcb7d,0xdb5c,0xeb3f,0xfb1e,0x8bf9,0x9bd8,0xabbb,0xbb9a,0x4a75,0x5a54,0x6a37,0x7a16,0x0af1,0x1ad0,0x2ab3,0x3a92,
0xfd2e,0xed0f,0xdd6c,0xcd4d,0xbdaa,0xad8b,0x9de8,0x8dc9,0x7c26,0x6c07,0x5c64,0x4c45,0x3ca2,0x2c83,0x1ce0,0x0cc1,
0xef1f,0xff3e,0xcf5d,0xdf7c,0xaf9b,0xbfba,0x8fd9,0x9ff8,0x6e17,0x7e36,0x4e55,0x5e74,0x2e93,0x3eb2,0x0ed1,0x1ef0
};
/* Conversion values passing structure*/
typedef struct {
guint32 conversation; /*Conversation ID*/
guint16 sequence; /*Sequence number of request telegram*/
} sbus_request_key;
typedef struct {
guint8 cmd_code; /*command code from request*/
guint8 count; /*rcount value*/
guint8 sysinfo; /*system information number (or command in other telegrams)*/
} sbus_request_val;
/* The GMemChunk base structure (for conversations)*/
static GHashTable *sbus_request_hash = NULL;
static GMemChunk *sbus_request_keys = NULL;
static GMemChunk *sbus_request_vals = NULL;
static guint crc_calc (guint crc, guint val)
{
int index;
guint ncrc;
index = (((crc >> 8) ^ val) & 0xff);
ncrc = crc_table[index] ^ ((crc << 8) & 0xffff);
return ncrc;
}
/* Hash functions*/
static gint sbus_equal(gconstpointer v, gconstpointer w)
{
sbus_request_key *v1 = (sbus_request_key *)v;
sbus_request_key *v2 = (sbus_request_key *)w;
if (v1->conversation == v2->conversation &&
v1->sequence == v2->sequence) {
return 1;
}
return 0;
}
static guint sbus_hash(gconstpointer v)
{
sbus_request_key *key = (sbus_request_key *)v;
guint val;
val = key->conversation + key->sequence;
return val;
}
/*Protocol initialisation*/
static void sbus_init_protocol(void){
if (sbus_request_hash){
g_hash_table_destroy(sbus_request_hash);
}
if (sbus_request_keys){
g_mem_chunk_destroy(sbus_request_keys);
}
if (sbus_request_vals){
g_mem_chunk_destroy(sbus_request_vals);
}
sbus_request_hash = g_hash_table_new(sbus_hash, sbus_equal);
sbus_request_keys = g_mem_chunk_new("sbus_request_keys",
sizeof(sbus_request_key),
SBUS_MEMCHUNKSIZE * sizeof(sbus_request_key),
G_ALLOC_AND_FREE);
sbus_request_vals = g_mem_chunk_new("sbus_request_vals",
sizeof(sbus_request_val),
SBUS_MEMCHUNKSIZE * sizeof(sbus_request_val),
G_ALLOC_AND_FREE);
}
/* check whether the packet looks like SBUS or not */
static gboolean
is_sbus_pdu(tvbuff_t *tvb)
{
guint32 length;
/* we need at least 8 bytes to determine whether this is sbus or
not
*/
if(tvb_length(tvb)<8){
return FALSE;
}
/* the length must be >= 8 bytes to accomodate the header,
it also must be <65536 to fit inside a udp packet
*/
length=tvb_get_ntohl(tvb, 0);
if ( (length<8) || (length>65535) ) {
return FALSE;
}
if (tvb_reported_length(tvb) != length) {
return FALSE;
}
/* XXX */
/* We should also test version and protocol but that requires
someone to look at the specification for SBUS
*/
return TRUE;
}
/*Dissect the telegram*/
static int
dissect_sbus(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
/* Set up structures needed to add the protocol subtree and manage it */
proto_item *ti, *et, *dt;
proto_tree *sbus_tree, *ethsbus_tree, *sbusdata_tree;
gint i; /*for CRC calculation*/
gint j; /*for CRC calculation*/
gint offset;
gint sbus_eth_len;
guint sbus_crc_calc;
guint8 sbus_version;
guint8 sbus_attribut;
guint8 sbus_media_cnt;
guint8 sbus_fio_cnt;
guint8 sbus_cmd_code;
guint8 sbus_web_size;
guint8 sbus_web_aid;
guint8 sbus_web_seq;
guint8 sbus_sysinfo_number;
guint32 sbus_binarymasked;
guint32 sbus_binaries;
guint16 sbus_ack_code;
guint32 sbus_show_bin;
guint32 sbus_helper;
guint32 sbus_helper1;
guint32 sbus_helper2;
char *tmp_string;
/* Set up conversations*/
conversation_t *conversation = NULL;
sbus_request_key request_key, *new_request_key;
sbus_request_val *request_val = NULL;
/* does this look like an sbus pdu? */
if(!is_sbus_pdu(tvb)){
return 0;
}
conversation = find_conversation(pinfo->fd->num, &pinfo->src, &pinfo->dst,
pinfo->ptype, pinfo->srcport, pinfo->destport, 0);
if (!conversation) {
/* create new conversation*/
conversation = conversation_new(pinfo->fd->num, &pinfo->src, &pinfo->dst,
pinfo->ptype, pinfo->srcport, pinfo->destport, 0);
}
request_key.conversation = conversation->index;
request_key.sequence = tvb_get_ntohs(tvb,6);
request_val = (sbus_request_val *) g_hash_table_lookup(sbus_request_hash,
&request_key);
/* Only allocate a new hash element when it's a request*/
sbus_attribut = tvb_get_guint8(tvb,8);
if ( !request_val && sbus_attribut == 0 ) {/* request telegram */
new_request_key = g_mem_chunk_alloc(sbus_request_keys);
*new_request_key = request_key;
request_val = g_mem_chunk_alloc(sbus_request_vals);
request_val->cmd_code=tvb_get_guint8(tvb,10);
if (((request_val->cmd_code) == SBUS_RD_USER_EEPROM_REGISTER) ||
((request_val->cmd_code) == SBUS_WR_USER_EEPROM_REGISTER)) {
request_val->count=((tvb_get_guint8(tvb,12))+1);
} else {
request_val->count=((tvb_get_guint8(tvb,11))+1);
}
/*Enter system info*/
if ((request_val->cmd_code) == SBUS_RD_SYSTEM_INFORMATION) {
request_val->sysinfo=(tvb_get_guint8(tvb,12));
} else {
request_val->sysinfo=0x0;
}
g_hash_table_insert(sbus_request_hash, new_request_key, request_val);
}
/* End of attaching data to hash table*/
/* Make entries in Protocol column and Info column on summary display */
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "S-Bus");
if (check_col(pinfo->cinfo, COL_INFO))
col_clear(pinfo->cinfo, COL_INFO);
offset = 0;
if (check_col(pinfo->cinfo, COL_INFO)) {
switch (sbus_attribut){
case SBUS_REQUEST:
sbus_cmd_code = tvb_get_guint8(tvb,10);
/* Special treatment of web server request
* as is is very helpful to see more information in the packetlist */
if (sbus_cmd_code == SBUS_WEB_SERVER_SERIAL_COMM) {
sbus_web_aid = tvb_get_guint8(tvb,12);
sbus_web_seq = tvb_get_guint8(tvb,13);
col_add_fstr(pinfo->cinfo, COL_INFO,
"Web Server Request: %s (Seq No: %d)",
val_to_str(sbus_web_aid,
webserver_aid_vals, "Unknown Request!"),
sbus_web_seq);
} else {
/* All other requests */
col_add_fstr(pinfo->cinfo, COL_INFO,
"Request: %s", val_to_str(sbus_cmd_code,
sbus_command_vals, "Unknown Command!"));
}
break;
case SBUS_RESPONSE:
/* Special treatment of web server request
* as is is very helpful to see more information in the packetlist */
if (request_val && ((request_val->cmd_code) == SBUS_WEB_SERVER_SERIAL_COMM)) {
sbus_web_size = tvb_get_guint8(tvb,9);
sbus_web_aid = tvb_get_guint8(tvb,10);
col_add_fstr(pinfo->cinfo, COL_INFO,
"Response: %s",
val_to_str(sbus_web_aid,
webserver_aid_vals, "Unknown Request!"));
if (sbus_web_size > 1) {
sbus_web_seq = tvb_get_guint8(tvb,11);
col_append_fstr(pinfo->cinfo, COL_INFO,
" (Seq No: %d)",
sbus_web_seq);
}
} else {
col_set_str(pinfo->cinfo, COL_INFO, "Response");
}
break;
case SBUS_ACKNAK:
sbus_ack_code = tvb_get_ntohs(tvb,9);
col_add_fstr(pinfo->cinfo, COL_INFO,
"%s", val_to_str(sbus_ack_code,
sbus_ack_nak_vals,
"Unknown NAK response code!"));
break;
default:
col_set_str(pinfo->cinfo, COL_INFO, "Unknown attribute");
break;
}
}
/* create display subtree for the protocol */
if (tree) {
ti = proto_tree_add_item(tree, proto_sbus, tvb, offset, -1, FALSE);
sbus_tree = proto_item_add_subtree(ti, ett_sbus);
/*Add subtree for Ether-S-Bus header*/
et = proto_tree_add_text(sbus_tree, tvb, offset, 8, "Ether-S-Bus header");
ethsbus_tree = proto_item_add_subtree(et, ett_sbus_ether);
/* add an item to the subtree*/
sbus_eth_len = tvb_get_ntohl(tvb,offset);
proto_tree_add_item(ethsbus_tree,
hf_sbus_length, tvb, offset, 4, FALSE);
offset += 4;
sbus_version = tvb_get_guint8(tvb,offset);
proto_tree_add_item(ethsbus_tree,
hf_sbus_version, tvb, offset, 1, FALSE);
offset += 1;
proto_tree_add_item(ethsbus_tree,
hf_sbus_protocol, tvb, offset, 1, FALSE);
offset += 1;
proto_tree_add_item(ethsbus_tree,
hf_sbus_sequence, tvb, offset, 2, FALSE);
offset += 2;
/* Continue adding stuff to the main tree*/
sbus_attribut = tvb_get_guint8(tvb,offset);
proto_tree_add_item(sbus_tree,
hf_sbus_attribut, tvb, offset, 1, FALSE);
offset += 1;
if (sbus_attribut == SBUS_REQUEST) {
proto_tree_add_item(sbus_tree,
hf_sbus_dest, tvb, offset, 1, FALSE);
offset += 1;
sbus_cmd_code = tvb_get_guint8(tvb,offset);
proto_tree_add_item(sbus_tree,
hf_sbus_command, tvb, offset, 1, FALSE);
offset += 1;
switch (sbus_cmd_code) {
/*Read Counter, Register or Timer*/
case SBUS_RD_COUNTER:
case SBUS_RD_REGISTER:
case SBUS_RD_TIMER:
sbus_media_cnt = (tvb_get_guint8(tvb,offset))+1;
proto_tree_add_uint(sbus_tree,
hf_sbus_rcount, tvb, offset, 1, sbus_media_cnt);
offset += 1;
proto_tree_add_item(sbus_tree,
hf_sbus_addr_rtc, tvb, offset, 2, FALSE);
offset += 2;
break;
/*Read Flag, Input or Output*/
case SBUS_RD_FLAG:
case SBUS_RD_INPUT:
case SBUS_RD_OUTPUT:
sbus_media_cnt = (tvb_get_guint8(tvb,offset))+1;
proto_tree_add_uint(sbus_tree,
hf_sbus_rcount, tvb, offset, 1, sbus_media_cnt);
offset += 1;
proto_tree_add_item(sbus_tree,
hf_sbus_addr_iof, tvb, offset, 2, FALSE);
offset += 2;
break;
/*Write Register Timer Counter*/
case SBUS_WR_COUNTER:
case SBUS_WR_REGISTER:
case SBUS_WR_TIMER:
sbus_media_cnt = (tvb_get_guint8(tvb,offset));
sbus_media_cnt = ((sbus_media_cnt - 1)/4);
proto_tree_add_uint(sbus_tree,
hf_sbus_wcount_calculated, tvb, offset,
1, sbus_media_cnt);
proto_tree_add_item(sbus_tree,
hf_sbus_wcount, tvb, offset, 1, FALSE);
offset += 1;
proto_tree_add_item(sbus_tree,
hf_sbus_addr_rtc, tvb, offset, 2, FALSE);
offset += 2;
/*Add subtree for Data*/
dt = proto_tree_add_text(sbus_tree, tvb, offset,
((sbus_media_cnt) * 4),"Data");
sbusdata_tree = proto_item_add_subtree(dt, ett_sbus_data);
for (i=((sbus_media_cnt)); i>0; i--) {
proto_tree_add_item(sbusdata_tree,
hf_sbus_data_rtc, tvb, offset,
4, FALSE);
offset += 4;
}
break;
/* Write flags and outputs*/
case SBUS_WR_FLAG:
case SBUS_WR_OUTPUT:
sbus_media_cnt = (tvb_get_guint8(tvb,offset));
sbus_media_cnt = (sbus_media_cnt - 2);
proto_tree_add_uint(sbus_tree,
hf_sbus_wcount_calculated, tvb, offset,
1, sbus_media_cnt);
proto_tree_add_item(sbus_tree,
hf_sbus_wcount, tvb, offset, 1, FALSE);
offset += 1;
proto_tree_add_item(sbus_tree,
hf_sbus_addr_iof, tvb, offset, 2, FALSE);
offset += 2;
sbus_fio_cnt = (tvb_get_guint8(tvb,offset));
sbus_fio_cnt = ((sbus_fio_cnt + 1));
proto_tree_add_uint(sbus_tree,
hf_sbus_fio_count, tvb, offset, 1, sbus_fio_cnt);
offset += 1;
/*Add subtree for Data*/
dt = proto_tree_add_text(sbus_tree, tvb, offset,
sbus_media_cnt,"Data");
sbusdata_tree = proto_item_add_subtree(dt, ett_sbus_data);
for (i=sbus_media_cnt; i>0; i--) {
sbus_helper = 1;
sbus_show_bin = 0;
sbus_binarymasked = 0x01;
sbus_binaries = tvb_get_guint8(tvb, offset);
for (j=0; j<8; j++) {
if ((sbus_binarymasked & sbus_binaries) != 0) {
sbus_show_bin = (sbus_show_bin + sbus_helper);
}
sbus_binarymasked = sbus_binarymasked<<1;
sbus_helper = 10 * sbus_helper;
}
proto_tree_add_uint_format(sbusdata_tree,
hf_sbus_data_iof, tvb, offset, 1, sbus_show_bin,
"Binary data: %08u", sbus_show_bin);
offset += 1;
}
break;
/* Request: Write Real time clock*/
case SBUS_WR_RTC:
sbus_helper = tvb_get_guint8(tvb, (offset +5)); /*hours*/
sbus_helper1 = tvb_get_guint8(tvb, (offset +6)); /*minutes*/
sbus_helper2 = tvb_get_guint8(tvb, (offset +7)); /*seconds*/
proto_tree_add_text(sbus_tree, tvb, (offset +5), 3,
"Time (HH:MM:SS): %02x:%02x:%02x", sbus_helper, sbus_helper1, sbus_helper2);
sbus_helper = tvb_get_guint8(tvb, (offset +2)); /*year*/
sbus_helper1 = tvb_get_guint8(tvb, (offset +3)); /*month*/
sbus_helper2 = tvb_get_guint8(tvb, (offset +4)); /*day*/
proto_tree_add_text(sbus_tree, tvb, (offset +2), 3,
"Date (YY/MM/DD): %02x/%02x/%02x", sbus_helper, sbus_helper1, sbus_helper2);
sbus_helper = tvb_get_guint8(tvb, (offset)); /*year-week*/
sbus_helper1 = tvb_get_guint8(tvb, (offset +1)); /*week-day*/
proto_tree_add_text(sbus_tree, tvb, offset, 2,
"Calendar week: %x, Week day: %x", sbus_helper, sbus_helper1);
/*Add subtree for Data*/
dt = proto_tree_add_text(sbus_tree, tvb, offset,
8, "Clock data");
sbusdata_tree = proto_item_add_subtree(dt, ett_sbus_data);
proto_tree_add_item(sbusdata_tree,
hf_sbus_week_day, tvb, offset, 2, FALSE);
offset += 2;
proto_tree_add_item(sbusdata_tree,
hf_sbus_date, tvb, offset, 3, FALSE);
offset += 3;
proto_tree_add_item(sbusdata_tree,
hf_sbus_time, tvb, offset, 3, FALSE);
offset += 3;
break;
/* Read user memory or program line*/
case SBUS_RD_USER_MEMORY:
case SBUS_RD_PROGRAM_LINE:
sbus_media_cnt = (tvb_get_guint8(tvb,offset))+1;
proto_tree_add_uint(sbus_tree,
hf_sbus_rcount, tvb, offset, 1, sbus_media_cnt);
offset += 1;
proto_tree_add_item(sbus_tree,
hf_sbus_addr_prog, tvb, offset, 3, FALSE);
offset += 3;
break;
/*Write user memory*/
case SBUS_WR_USER_MEMORY:
sbus_media_cnt = (tvb_get_guint8(tvb,offset));
sbus_media_cnt = ((sbus_media_cnt - 2)/4);
proto_tree_add_uint(sbus_tree,
hf_sbus_wcount_calculated, tvb, offset,
1, sbus_media_cnt);
proto_tree_add_item(sbus_tree,
hf_sbus_wcount, tvb, offset, 1, FALSE);
offset += 1;
proto_tree_add_item(sbus_tree,
hf_sbus_addr_68k, tvb, offset, 3, FALSE);
offset += 3;
/*Add subtree for Data*/
dt = proto_tree_add_text(sbus_tree, tvb, offset,
((sbus_media_cnt) * 4),"Program lines");
sbusdata_tree = proto_item_add_subtree(dt, ett_sbus_data);
for (i=((sbus_media_cnt)); i>0; i--) {
proto_tree_add_item(sbusdata_tree,
hf_sbus_data_rtc, tvb, offset,
4, FALSE);
offset += 4;
}
break;
/* Read byte*/
case SBUS_RD_BYTE:
sbus_media_cnt = (tvb_get_guint8(tvb,offset))+1;
proto_tree_add_uint(sbus_tree,
hf_sbus_rcount, tvb, offset, 1, sbus_media_cnt);
offset += 1;
proto_tree_add_item(sbus_tree,
hf_sbus_addr_68k, tvb, offset, 3, FALSE);
offset += 3;
break;
/* Write byte */
case SBUS_WR_BYTE:
sbus_media_cnt = (tvb_get_guint8(tvb,offset));
sbus_media_cnt = (sbus_media_cnt - 2);
proto_tree_add_uint(sbus_tree,
hf_sbus_wcount_calculated, tvb, offset,
1, sbus_media_cnt);
proto_tree_add_item(sbus_tree,
hf_sbus_wcount, tvb, offset, 1, FALSE);
offset += 1;
proto_tree_add_item(sbus_tree,
hf_sbus_addr_68k, tvb, offset, 3, FALSE);
offset += 3;
/*Add subtree for Data*/
dt = proto_tree_add_text(sbus_tree, tvb, offset,
((sbus_media_cnt) * 4),"Data (bytes)");
sbusdata_tree = proto_item_add_subtree(dt, ett_sbus_data);
for (i=sbus_media_cnt; i>0; i--) {
proto_tree_add_item(sbusdata_tree,
hf_sbus_data_byte, tvb, offset,
1, FALSE);
offset += 1;
}
break;
/*Read EEPROM register*/
case SBUS_RD_USER_EEPROM_REGISTER:
proto_tree_add_item(sbus_tree,
hf_sbus_command_extension, tvb, offset, 1, FALSE);
offset += 1;
sbus_media_cnt = (tvb_get_guint8(tvb,offset))+1;
proto_tree_add_uint(sbus_tree,
hf_sbus_rcount, tvb, offset, 1, sbus_media_cnt);
offset += 1;
proto_tree_add_item(sbus_tree,
hf_sbus_addr_eeprom, tvb, offset, 2, FALSE);
offset += 2;
break;
/*Request for reading system info*/
/*Syinfo 05 is not implemented as no serial baud is possible*/
case SBUS_RD_SYSTEM_INFORMATION:
sbus_sysinfo_number = (tvb_get_guint8(tvb,13));
proto_tree_add_item(sbus_tree,
hf_sbus_sysinfo_nr, tvb, offset, 1, FALSE);
offset += 1;
sbus_sysinfo_number = (tvb_get_guint8(tvb,14));
proto_tree_add_item(sbus_tree,
hf_sbus_sysinfo_nr, tvb, offset, 1, FALSE);
offset += 1;
break;
/* WebServer Request */
case SBUS_WEB_SERVER_SERIAL_COMM:
sbus_web_size = tvb_get_guint8(tvb,offset);
proto_tree_add_item(sbus_tree,
hf_sbus_web_size, tvb, offset,
1, sbus_web_size);
offset += 1;
sbus_web_aid = tvb_get_guint8(tvb,offset);
proto_tree_add_item(sbus_tree,
hf_sbus_web_aid, tvb, offset,
1, sbus_web_aid);
offset += 1;
sbus_web_seq = tvb_get_guint8(tvb,offset);
proto_tree_add_item(sbus_tree,
hf_sbus_web_seq, tvb, offset,
1, sbus_web_seq);
offset += 1;
if (sbus_web_size > 1) {
dt = proto_tree_add_text(sbus_tree, tvb, offset,
(sbus_web_size - 1),"Data (bytes)");
sbusdata_tree = proto_item_add_subtree(dt, ett_sbus_data);
for (i=sbus_web_size -1 ; i>0; i--) {
proto_tree_add_item(sbusdata_tree,
hf_sbus_data_byte, tvb, offset,
1, FALSE);
offset += 1;
}
}
break;
/*Inform that command was not dissected and add remaining length*/
default:
if (sbus_eth_len > 13) { /*13 bytes is the minimal length of a request telegram...*/
sbus_helper = sbus_eth_len - (offset + 2);
proto_tree_add_text(sbus_tree, tvb, offset, sbus_helper,
"This telegram isn't implemented in the dissector.");
offset = offset + sbus_helper;
}
}
}
/* Response dissection*/
if (sbus_attribut == SBUS_RESPONSE && request_val) {
switch (request_val->cmd_code) {
/* Response: 32 bit values*/
case SBUS_RD_COUNTER:
case SBUS_RD_REGISTER:
case SBUS_RD_TIMER:
case SBUS_RD_USER_MEMORY:
case SBUS_RD_PROGRAM_LINE:
case SBUS_RD_USER_EEPROM_REGISTER:
/*Add subtree for Data*/
dt = proto_tree_add_text(sbus_tree, tvb, offset,
((request_val->count) * 4),"Data");
sbusdata_tree = proto_item_add_subtree(dt, ett_sbus_data);
for (i=(request_val->count); i>0; i--) {
proto_tree_add_item(sbusdata_tree,
hf_sbus_data_rtc, tvb, offset,
4, FALSE);
offset += 4;
}
break;
/* Response: PCD Display register*/
case SBUS_RD_DISPLAY_REGISTER:
proto_tree_add_item(sbus_tree,
hf_sbus_display_register, tvb, offset, 4, FALSE);
offset += 4;
break;
/* Add binary data I, O, F*/
case SBUS_RD_FLAG:
case SBUS_RD_INPUT:
case SBUS_RD_OUTPUT:
/*Add subtree for Data*/
dt = proto_tree_add_text(sbus_tree, tvb, offset,
(((request_val->count) + 7) / 8), "Data");
sbusdata_tree = proto_item_add_subtree(dt, ett_sbus_data);
for (i=(((request_val->count) + 7) / 8); i>0; i--) {
sbus_helper = 1;
sbus_show_bin = 0;
sbus_binarymasked = 0x01;
sbus_binaries = tvb_get_guint8(tvb, offset);
for (j=0; j<8; j++){
if ((sbus_binarymasked & sbus_binaries) != 0) {
sbus_show_bin = (sbus_show_bin + sbus_helper);
}
sbus_binarymasked = sbus_binarymasked<<1;
sbus_helper = 10 * sbus_helper;
}
proto_tree_add_uint_format(sbusdata_tree,
hf_sbus_data_iof, tvb, offset, 1, sbus_show_bin,
"Binary data: %08u", sbus_show_bin);
offset += 1;
}
break;
/* Response: Real time clock value*/
case SBUS_RD_RTC:
sbus_helper = tvb_get_guint8(tvb, (offset +5)); /*hours*/
sbus_helper1 = tvb_get_guint8(tvb, (offset +6)); /*minutes*/
sbus_helper2 = tvb_get_guint8(tvb, (offset +7)); /*seconds*/
proto_tree_add_text(sbus_tree, tvb, (offset +5), 3,
"Time (HH:MM:SS): %02x:%02x:%02x", sbus_helper, sbus_helper1, sbus_helper2);
sbus_helper = tvb_get_guint8(tvb, (offset +2)); /*year*/
sbus_helper1 = tvb_get_guint8(tvb, (offset +3)); /*month*/
sbus_helper2 = tvb_get_guint8(tvb, (offset +4)); /*day*/
proto_tree_add_text(sbus_tree, tvb, (offset +2), 3,
"Date (YY/MM/DD): %02x/%02x/%02x", sbus_helper, sbus_helper1, sbus_helper2);
sbus_helper = tvb_get_guint8(tvb, (offset)); /*year-week*/
sbus_helper1 = tvb_get_guint8(tvb, (offset +1)); /*week-day*/
proto_tree_add_text(sbus_tree, tvb, offset, 2,
"Calendar week: %x, Week day: %x", sbus_helper, sbus_helper1);
/*Add subtree for Data*/
dt = proto_tree_add_text(sbus_tree, tvb, offset,
8, "Clock data");
sbusdata_tree = proto_item_add_subtree(dt, ett_sbus_data);
proto_tree_add_item(sbusdata_tree,
hf_sbus_week_day, tvb, offset, 2, FALSE);
offset += 2;
proto_tree_add_item(sbusdata_tree,
hf_sbus_date, tvb, offset, 3, FALSE);
offset += 3;
proto_tree_add_item(sbusdata_tree,
hf_sbus_time, tvb, offset, 3, FALSE);
offset += 3;
break;
/* Response: CPU status, the command codes 14..1B are concerned*/
case SBUS_RD_PCD_STATUS_CPU0:
case SBUS_RD_PCD_STATUS_CPU1:
case SBUS_RD_PCD_STATUS_CPU2:
case SBUS_RD_PCD_STATUS_CPU3:
case SBUS_RD_PCD_STATUS_CPU4:
case SBUS_RD_PCD_STATUS_CPU5:
case SBUS_RD_PCD_STATUS_CPU6:
case SBUS_RD_PCD_STATUS_OWN:
proto_tree_add_item(sbus_tree,
hf_sbus_cpu_status, tvb, offset, 1, FALSE);
offset += 1;
break;
/* Response: Station address*/
case SBUS_RD_SBUS_STN_NBR:
proto_tree_add_item(sbus_tree,
hf_sbus_address, tvb, offset, 1, FALSE);
offset += 1;
break;
/* Response: Firmware version */
case SBUS_RD_PROGRAM_VERSION:
/*PCD type*/
tmp_string = tvb_get_string(tvb, offset, 5);
proto_tree_add_string(sbus_tree,
hf_sbus_cpu_type, tvb, offset, 5, tmp_string);
offset += 5;
g_free(tmp_string);
/*FW version*/
tmp_string = tvb_get_string(tvb , offset, 3);
proto_tree_add_string(sbus_tree,
hf_sbus_fw_version, tvb, offset, 3, tmp_string);
offset += 4;
g_free(tmp_string);
break;
/* Response for Status Flags*/
case SBUS_RD_STATUSFLAG_ACCU:
/*Add subtree for Data*/
dt = proto_tree_add_text(sbus_tree, tvb, offset,
1,"ACCU and arithmetic status");
sbusdata_tree = proto_item_add_subtree(dt, ett_sbus_data);
proto_tree_add_item(sbusdata_tree, hf_sbus_flags_accu,
tvb, offset, 1, FALSE);
proto_tree_add_item(sbusdata_tree, hf_sbus_flags_error,
tvb, offset, 1, FALSE);
proto_tree_add_item(sbusdata_tree, hf_sbus_flags_negative,
tvb, offset, 1, FALSE);
proto_tree_add_item(sbusdata_tree, hf_sbus_flags_zero,
tvb, offset, 1, FALSE);
offset +=1;
break;
/* Response for Read byte */
case SBUS_RD_BYTE:
/*Add subtree for Data*/
dt = proto_tree_add_text(sbus_tree, tvb, offset,
(request_val->count),"Data (bytes)");
sbusdata_tree = proto_item_add_subtree(dt, ett_sbus_data);
for (i=(request_val->count); i>0; i--) {
proto_tree_add_item(sbusdata_tree,
hf_sbus_data_byte, tvb, offset,
1, FALSE);
offset += 1;
}
break;
/* Response for Read Index register */
case SBUS_RD_INDEX_REGISTER:
/*Add subtree for Data*/
dt = proto_tree_add_text(sbus_tree, tvb, offset,
2,"Data (hex bytes)");
sbusdata_tree = proto_item_add_subtree(dt, ett_sbus_data);
for (i=0; i<2; i++) { /*2 bytes*/
proto_tree_add_item(sbusdata_tree,
hf_sbus_data_byte_hex, tvb, offset,
1, FALSE);
offset += 1;
}
break;
/* Response: Instruction pointer*/
case SBUS_RD_INSTRUCTION_POINTER:
proto_tree_add_item(sbus_tree,
hf_sbus_addr_prog, tvb, offset, 3, FALSE);
offset += 3;
break;
/*Response for Find History*/
case SBUS_FIND_HISTORY:
proto_tree_add_item(sbus_tree,
hf_sbus_addr_68k, tvb, offset, 3, FALSE);
offset += 3;
proto_tree_add_item(sbus_tree,
hf_sbus_nbr_elements, tvb, offset, 2, FALSE);
offset += 2;
break;
/* Response: Read current block*/
case SBUS_RD_CURRENT_BLOCK:
proto_tree_add_item(sbus_tree,
hf_sbus_block_type, tvb, offset, 1, FALSE);
offset += 1;
proto_tree_add_item(sbus_tree,
hf_sbus_block_nr, tvb, offset, 2, FALSE);
offset += 2;
break;
/* Response: Read system infomation (without interpretation of module info)*/
case SBUS_RD_SYSTEM_INFORMATION:
if (((request_val->sysinfo) == 0x00)){ /*sysinfo 0*/
offset += 1; /* this byte is always 0x01*/
/*Add subtree for Data*/
dt = proto_tree_add_text(sbus_tree, tvb, offset,
1,"System info");
sbusdata_tree = proto_item_add_subtree(dt, ett_sbus_data);
proto_tree_add_item(sbusdata_tree, hf_sbus_sysinfo0_1,
tvb, offset, 1, FALSE);
proto_tree_add_item(sbusdata_tree, hf_sbus_sysinfo0_2,
tvb, offset, 1, FALSE);
proto_tree_add_item(sbusdata_tree, hf_sbus_sysinfo0_3,
tvb, offset, 1, FALSE);
proto_tree_add_item(sbusdata_tree, hf_sbus_sysinfo0_4,
tvb, offset, 1, FALSE);
proto_tree_add_item(sbusdata_tree, hf_sbus_sysinfo0_5,
tvb, offset, 1, FALSE);
offset += 1;
}
break;
/* Response: Webserver request */
case SBUS_WEB_SERVER_SERIAL_COMM:
sbus_web_size = tvb_get_guint8(tvb,offset);
proto_tree_add_item(sbus_tree,
hf_sbus_web_size, tvb, offset,
1, sbus_web_size);
offset += 1;
sbus_web_aid = tvb_get_guint8(tvb,offset);
proto_tree_add_item(sbus_tree,
hf_sbus_web_aid, tvb, offset,
1, sbus_web_aid);
offset += 1;
if (sbus_web_size > 1) {
sbus_web_seq = tvb_get_guint8(tvb,offset);
proto_tree_add_item(sbus_tree,
hf_sbus_web_seq, tvb, offset,
1, sbus_web_seq);
offset += 1;
dt = proto_tree_add_text(sbus_tree, tvb, offset,
(sbus_web_size - 2),"Data (bytes)");
sbusdata_tree = proto_item_add_subtree(dt, ett_sbus_data);
for (i=sbus_web_size - 2; i>0; i--) {
proto_tree_add_item(sbusdata_tree,
hf_sbus_data_byte, tvb, offset,
1, FALSE);
offset += 1;
}
}
break;
/*Inform that response was not dissected and add remaining length*/
default:
sbus_helper = sbus_eth_len - (offset + 2);
proto_tree_add_text(sbus_tree, tvb, offset, sbus_helper,
"This telegram isn't implemented in the dissector.");
offset = offset + sbus_helper;
break;
}
}
if (sbus_attribut == SBUS_ACKNAK) {
proto_tree_add_item(sbus_tree,
hf_sbus_acknackcode, tvb, offset, 2, FALSE);
offset += 2;
}
/* Calclulate CRC */
sbus_crc_calc = 0;
for (i = 0; i < sbus_eth_len - 2; i++)
sbus_crc_calc = crc_calc (sbus_crc_calc, tvb_get_guint8(tvb, i));
/*Show CRC and add hidden item for wrong CRC*/
sbus_helper = tvb_get_ntohs(tvb, offset);
if (sbus_helper == sbus_crc_calc) {
proto_tree_add_uint_format(sbus_tree,
hf_sbus_crc, tvb, offset, 2, sbus_helper,
"Checksum: 0x%04x (correct)", sbus_helper);
} else {
proto_tree_add_uint_format(sbus_tree,
hf_sbus_crc, tvb, offset, 2, sbus_helper,
"Checksum: 0x%04x (NOT correct)", sbus_helper);
proto_tree_add_boolean_hidden(sbus_tree,
hf_sbus_crc_bad, tvb, offset + 2, 2, TRUE);
}
offset += 2; /*now at the end of the telegram*/
}
return tvb_length(tvb);
/*End of dissect_sbus*/
}
/* Register the protocol with Wireshark */
void
proto_register_sbus(void)
{
/* Setup list of header fields See Section 1.6.1 for details*/
static hf_register_info hf[] = {
{ &hf_sbus_length,
{ "Length (bytes)", "sbus.len",
FT_UINT32, BASE_DEC, NULL, 0,
"SAIA Ether-S-Bus telegram length", HFILL }
},
{ &hf_sbus_version,
{ "Version", "sbus.vers",
FT_UINT8, BASE_DEC, NULL, 0,
"SAIA Ether-S-Bus version", HFILL }
},
{ &hf_sbus_protocol,
{ "Protocol type", "sbus.proto",
FT_UINT8, BASE_DEC, NULL, 0,
"SAIA Ether-S-Bus protocol type", HFILL }
},
{ &hf_sbus_sequence,
{ "Sequence", "sbus.seq",
FT_UINT16, BASE_DEC, NULL, 0,
"SAIA Ether-S-Bus sequence number", HFILL }
},
{ &hf_sbus_attribut,
{ "Telegram attribute", "sbus.att",
FT_UINT8, BASE_HEX, VALS(sbus_att_vals), 0,
"SAIA Ether-S-Bus telegram attribute, indicating type of telegram", HFILL }
},
{ &hf_sbus_dest,
{ "Destination", "sbus.destination",
FT_UINT8, BASE_DEC, NULL, 0,
"SAIA S-Bus destination address", HFILL }
},
{ &hf_sbus_address,
{ "S-Bus address", "sbus.address",
FT_UINT8, BASE_DEC, NULL, 0,
"SAIA S-Bus station address", HFILL }
},
{ &hf_sbus_command,
{ "Command", "sbus.cmd",
FT_UINT8, BASE_HEX, VALS(sbus_command_vals), 0,
"SAIA S-Bus command", HFILL }
},
{ &hf_sbus_command_extension,
{ "Command extension", "sbus.cmd_extn",
FT_UINT8, BASE_HEX, NULL, 0,
"SAIA S-Bus command extension", HFILL }
},
{ &hf_sbus_rcount,
{ "R-count", "sbus.rcount",
FT_UINT8, BASE_DEC, NULL, 0,
"Number of elements expected in response", HFILL }
},
{ &hf_sbus_wcount,
{ "W-count (raw)", "sbus.wcount",
FT_UINT8, BASE_DEC, NULL, 0,
"Number of bytes to be written", HFILL }
},
{ &hf_sbus_wcount_calculated,
{ "W-count (32 bit values)", "sbus.wcount_calc",
FT_UINT8, BASE_DEC, NULL, 0,
"Number of elements to be written", HFILL }
},
{ &hf_sbus_fio_count,
{ "FIO Count (amount of bits)", "sbus.fio_count",
FT_UINT8, BASE_DEC, NULL, 0,
"Number of binary elements to be written", HFILL }
},
{ &hf_sbus_addr_rtc,
{ "Base address RTC", "sbus.addr_RTC",
FT_UINT16, BASE_DEC, NULL, 0,
"Base address of 32 bit elements to read", HFILL }
},
{ &hf_sbus_addr_iof,
{ "Base address IOF", "sbus.addr_IOF",
FT_UINT16, BASE_DEC, NULL, 0,
"Base address of binary elements to read", HFILL }
},
{ &hf_sbus_addr_eeprom,
{ "Base address of EEPROM register", "sbus.addr_EEPROM",
FT_UINT16, BASE_DEC, NULL, 0,
"Base address of 32 bit EEPROM register to read or write", HFILL }
},
{ &hf_sbus_addr_prog,
{ "Base address of user memory or program lines", "sbus.addr_prog",
FT_UINT24, BASE_DEC, NULL, 0,
"Base address of the user memory or program lines (read or write)", HFILL }
},
{ &hf_sbus_addr_68k,
{ "Base address of bytes", "sbus.addr_prog",
FT_UINT24, BASE_HEX, NULL, 0,
"Base address of bytes to read or write (68k address)", HFILL }
},
{ &hf_sbus_block_type,
{ "Block type", "sbus.block_type",
FT_UINT8, BASE_HEX, VALS(sbus_block_types), 0,
"Program block type read", HFILL }
},
{ &hf_sbus_block_nr,
{ "Block/Element nr", "sbus.block_nr",
FT_UINT16, BASE_DEC, NULL, 0,
"Program block / DatatBlock number", HFILL }
},
{ &hf_sbus_nbr_elements,
{ "Number of elements", "sbus.nbr_elements",
FT_UINT16, BASE_DEC, NULL, 0,
"Number of elements or characters", HFILL }
},
{ &hf_sbus_display_register,
{ "PCD Display register", "sbus.data_display_register",
FT_UINT32, BASE_DEC, NULL, 0,
"The PCD display register (32 bit value)", HFILL }
},
{ &hf_sbus_data_rtc,
{ "S-Bus 32-bit data", "sbus.data_rtc",
FT_UINT32, BASE_DEC, NULL, 0,
"One regiser/timer of counter (32 bit value)", HFILL }
},
{ &hf_sbus_data_byte,
{ "Data bytes", "sbus.data_byte",
FT_UINT8, BASE_DEC, NULL, 0,
"One byte from PCD", HFILL }
},
{ &hf_sbus_data_byte_hex,
{ "Data bytes (hex)", "sbus.data_byte_hex",
FT_UINT8, BASE_HEX, NULL, 0,
"One byte from PCD (hexadecimal)", HFILL }
},
{ &hf_sbus_data_iof,
{ "S-Bus binary data", "sbus.data_iof",
FT_UINT32, BASE_DEC, NULL, 0,
"8 binaries", HFILL }
},
{ &hf_sbus_cpu_type,
{ "PCD type", "sbus.pcd_type",
FT_STRING, BASE_NONE, NULL, 0,
"PCD type (short form)", HFILL }
},
{ &hf_sbus_fw_version,
{ "Firmware version", "sbus.fw_version",
FT_STRING, BASE_NONE, NULL, 0,
"Firmware version of the PCD or module", HFILL }
},
{ &hf_sbus_sysinfo_nr,
{ "System information number", "sbus.sysinfo",
FT_UINT8, BASE_HEX, NULL, 0,
"System information number (extension to command code)", HFILL }
},
{ &hf_sbus_sysinfo0_1,
{ "Mem size info", "sbus.sysinfo0.mem",
FT_BOOLEAN, 8, TFS(&tfs_sbus_present), F_MEMSIZE,
"Availability of memory size information", HFILL }
},
{ &hf_sbus_sysinfo0_2,
{ "Trace buffer", "sbus.sysinfo0.trace",
FT_BOOLEAN, 8, TFS(&tfs_sbus_present), F_TRACE,
"Availability of trace buffer feature", HFILL }
},
{ &hf_sbus_sysinfo0_3,
{ "Slot B1", "sbus.sysinfo0.b1",
FT_BOOLEAN, 8, TFS(&tfs_sbus_present), F_INFO_B1,
"Presence of EEPROM information on slot B1", HFILL }
},
{ &hf_sbus_sysinfo0_4,
{ "Slot B2", "sbus.sysinfo0.b2",
FT_BOOLEAN, 8, TFS(&tfs_sbus_present), F_INFO_B2,
"Presence of EEPROM information on slot B2", HFILL }
},
{ &hf_sbus_sysinfo0_5,
{ "PGU baud", "sbus.sysinfo0.pgubaud",
FT_BOOLEAN, 8, TFS(&tfs_sbus_present), F_PGU_BAUD,
"Availability of PGU baud switch feature", HFILL }
},
{ &hf_sbus_sysinfo_length,
{ "System information length", "sbus.sysinfo_length",
FT_UINT8, BASE_HEX, NULL, 0,
"System information length in response", HFILL }
},
{ &hf_sbus_f_module_type,
{ "F-module type", "sbus.fmodule_type",
FT_STRING, BASE_NONE, NULL, 0,
"Module type mounted on B1/2 slot", HFILL }
},
{ &hf_sbus_harware_version,
{ "Hardware version", "sbus.hw_version",
FT_STRING, BASE_NONE, NULL, 0,
"Hardware version of the PCD or the module", HFILL }
},
{ &hf_sbus_hardware_modification,
{ "Hardware modification", "sbus.hw_modification",
FT_UINT8, BASE_DEC, NULL, 0,
"Hardware modification of the PCD or module", HFILL }
},
{ &hf_sbus_various,
{ "Varous data", "sbus.various",
FT_NONE, BASE_NONE, NULL, 0,
"Various data contained in telegrams but nobody will search for it", HFILL }
},
{ &hf_sbus_acknackcode,
{ "ACK/NAK code", "sbus.nakcode",
FT_UINT16, BASE_HEX, VALS(sbus_ack_nak_vals), 0,
"SAIA S-Bus ACK/NAK response", HFILL }
},
{ &hf_sbus_cpu_status,
{ "CPU status", "sbus.CPU_status",
FT_UINT8, BASE_HEX, VALS(sbus_CPU_status), 0,
"SAIA PCD CPU status", HFILL }
},
{ &hf_sbus_week_day,
{ "RTC calendar week and week day", "sbus.rtc.week_day",
FT_UINT16, BASE_HEX, NULL, 0,
"Calendar week and week day number of the real time clock", HFILL }
},
{ &hf_sbus_date,
{ "RTC date (YYMMDD)", "sbus.rtc.date",
FT_UINT24, BASE_HEX, NULL, 0,
"Year, month and day of the real time clock", HFILL }
},
{ &hf_sbus_time,
{ "RTC time (HHMMSS)", "sbus.rtc.time",
FT_UINT24, BASE_HEX, NULL, 0,
"Time of the real time clock", HFILL }
},
{ &hf_sbus_web_size,
{ "Web server packet size", "sbus.web.size",
FT_UINT8, BASE_HEX, NULL, 0,
"Web server packet size", HFILL }
},
{ &hf_sbus_web_aid,
{ "AID", "sbus.web.aid",
FT_UINT8, BASE_HEX, NULL, 0,
"Web server command/status code (AID)", HFILL }
},
{ &hf_sbus_web_seq,
{ "Sequence", "sbus.web.seq",
FT_UINT8, BASE_HEX, NULL, 0,
"Web server sequence nr (PACK_N)", HFILL }
},
{ &hf_sbus_crc,
{ "Checksum", "sbus.crc",
FT_UINT16, BASE_HEX, NULL, 0,
"CRC 16", HFILL }
},
{ &hf_sbus_crc_bad,
{ "Bad Checksum", "sbus.crc_bad", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
"A bad checksum in the telegram", HFILL }},
{ &hf_sbus_flags_accu,
{ "ACCU", "sbus.flags.accu",
FT_BOOLEAN, 8, TFS(&tfs_sbus_flags), F_ACCU,
"PCD Accumulator", HFILL }
},
{ &hf_sbus_flags_error,
{ "Error flag", "sbus.flags.error",
FT_BOOLEAN, 8, TFS(&tfs_sbus_flags), F_ERROR,
"PCD error flag", HFILL }
},
{ &hf_sbus_flags_negative,
{ "N-flag", "sbus.flags.nflag",
FT_BOOLEAN, 8, TFS(&tfs_sbus_flags), F_NEGATIVE,
"Negative status flag", HFILL }
},
{ &hf_sbus_flags_zero,
{ "Z-flag", "sbus.flags.zflag",
FT_BOOLEAN, 8, TFS(&tfs_sbus_flags), F_ZERO,
"Zero status flag", HFILL }
}
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_sbus,
&ett_sbus_ether,
&ett_sbus_data
};
/* Register the protocol name and description */
proto_sbus = proto_register_protocol("SAIA S-Bus", "SBUS", "sbus");
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array(proto_sbus, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
register_init_routine(&sbus_init_protocol);
}
void
proto_reg_handoff_sbus(void)
{
dissector_handle_t sbus_handle;
sbus_handle = new_create_dissector_handle(dissect_sbus, proto_sbus);
dissector_add("udp.port", 5050, sbus_handle);
}
syntax highlighted by Code2HTML, v. 0.9.1