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186e67ec1d
This allows the path for the default filter to be specified explicitly when creating a stream and reduces the need to rely on the default path function to magically supply the path. The default path function is now only used if, when a filter is added to a stream, it has neither a path nor a path function already. Adapted the existing Log::create_stream calls to explicitly specify a path value. Addresses BIT-1324
58 lines
1.6 KiB
Text
58 lines
1.6 KiB
Text
##! Script for tracking known Modbus masters and slaves.
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##!
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##! .. todo:: This script needs a lot of work. What might be more interesting
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##! is to track master/slave relationships based on commands sent and
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##! successful (non-exception) responses.
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@load base/protocols/modbus
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module Known;
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export {
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redef enum Log::ID += { MODBUS_LOG };
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type ModbusDeviceType: enum {
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MODBUS_MASTER,
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MODBUS_SLAVE,
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};
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type ModbusInfo: record {
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## The time the device was discovered.
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ts: time &log;
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## The IP address of the host.
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host: addr &log;
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## The type of device being tracked.
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device_type: ModbusDeviceType &log;
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};
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## The Modbus nodes being tracked.
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global modbus_nodes: set[addr, ModbusDeviceType] &create_expire=1day &redef;
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## Event that can be handled to access the loggable record as it is sent
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## on to the logging framework.
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global log_known_modbus: event(rec: ModbusInfo);
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}
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event bro_init() &priority=5
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{
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Log::create_stream(Known::MODBUS_LOG, [$columns=ModbusInfo, $ev=log_known_modbus, $path="known_modbus"]);
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}
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event modbus_message(c: connection, headers: ModbusHeaders, is_orig: bool)
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{
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local master = c$id$orig_h;
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local slave = c$id$resp_h;
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if ( [master, MODBUS_MASTER] !in modbus_nodes )
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{
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add modbus_nodes[master, MODBUS_MASTER];
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Log::write(MODBUS_LOG, [$ts=network_time(), $host=master, $device_type=MODBUS_MASTER]);
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}
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if ( [slave, MODBUS_SLAVE] !in modbus_nodes )
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{
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add modbus_nodes[slave, MODBUS_SLAVE];
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Log::write(MODBUS_LOG, [$ts=network_time(), $host=slave, $device_type=MODBUS_SLAVE]);
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}
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}
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