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## Simple implementation that outputs the raw request and response data
## to a log file.
## Currently, this only handles the read_holding_registers event. Other
## events can be handled similarily. This implementation assumes that
## requests and responses are exchanged within the same connection. I am not
## sure whether this really holds.
module Pasad;
export {
redef enum Log::ID += { LOG };
type Info: record {
ts_request: time &log;
ts_response: time &log &optional;
rtype: string &log;
tid_request: count &log;
tid_response: count &log &optional;
start_address: count &log;
quantity: count &log;
registers: ModbusRegisters &log &optional;
};
}
redef record connection += {
pasad: Info &optional;
};
event bro_init() &priority=5
{
Log::create_stream(Pasad::LOG, [$columns=Info, $path="pasad-simple"]);
}
event modbus_read_holding_registers_request(c: connection, headers: ModbusHeaders, start_address: count, quantity: count)
{
local rec: Info = [$ts_request=network_time(), $rtype="holding", $tid_request=headers$tid, $start_address=start_address, $quantity=quantity];
c$pasad = rec;
}
event modbus_read_holding_registers_response(c: connection, headers: ModbusHeaders, registers: ModbusRegisters)
{
c$pasad$tid_response = headers$tid;
c$pasad$ts_response = network_time();
c$pasad$registers = registers;
Log::write(Pasad::LOG, c$pasad);
}
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