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# Copyright 2017 Robert Gustafsson
# Copyright 2017 Robin Krahl
# Copyright 2017 Andreas Lindhé
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
## 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 Midbro;
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;
ip_orig: addr &log;
ip_resp: addr &log;
start_address: count &log;
quantity: count &log;
registers: ModbusRegisters &log &optional;
};
}
redef record connection += {
midbro: Info &optional;
};
event bro_init() &priority=5
{
Log::create_stream(Midbro::LOG, [$columns=Info, $path="midbro-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,
$ip_orig=c$id$orig_h,
$ip_resp=c$id$resp_h
];
c$midbro = rec;
}
event modbus_read_holding_registers_response(c: connection, headers: ModbusHeaders, registers: ModbusRegisters)
{
c$midbro$tid_response = headers$tid;
c$midbro$ts_response = network_time();
c$midbro$registers = registers;
Log::write(Midbro::LOG, c$midbro);
}
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