policy/protocols/conn/known-hosts.bro

Known

This script logs hosts that Bro determines have performed complete TCP handshakes and logs the address once per day (by default). The log that is output provides an easy way to determine a count of the IP addresses in use on a network per day.

Namespace:Known Imports:base/utils/directions-and-hosts.bro Source File:/scripts/policy/protocols/conn/known-hosts.bro

Summary

Options

Known::host_tracking: Host &redef

The hosts whose existence should be logged and tracked.

State Variables

Known::known_hosts: set &create_expire = 1.0 day &synchronized &redef

The set of all known addresses to store for preventing duplicate logging of addresses.

Types

Known::HostsInfo: record

The record type which contains the column fields of the known-hosts log.

Redefinitions

Log::ID: enum

The known-hosts logging stream identifier.

Events

Known::log_known_hosts: event

An event that can be handled to access the Known::HostsInfo record as it is sent on to the logging framework.

Detailed Interface

Options

Known::host_tracking

Type:Host Attributes:&redef Default:ALL_HOSTS

The hosts whose existence should be logged and tracked. See Host for possible choices.

State Variables

Known::known_hosts

Type:set [addr] Attributes:&create_expire = 1.0 day &synchronized &redef Default:{}

The set of all known addresses to store for preventing duplicate logging of addresses. It can also be used from other scripts to inspect if an address has been seen in use. Maintain the list of known hosts for 24 hours so that the existence of each individual address is logged each day.

Types

Known::HostsInfo

Type:

record

ts: time &log

The timestamp at which the host was detected.

host: addr &log

The address that was detected originating or responding to a TCP connection.

The record type which contains the column fields of the known-hosts log.

Events

Known::log_known_hosts

Type:event (rec: Known::HostsInfo)

An event that can be handled to access the Known::HostsInfo record as it is sent on to the logging framework.