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b1a6692ebf
Added a few missing packages to the install instructions. Combined the two different sets of GeoIP install instructions into one location and updated it. Fixed a couple minor typos.
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2.8 KiB
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119 lines
2.8 KiB
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.. _geolocation:
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===========
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GeoLocation
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===========
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.. rst-class:: opening
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During the process of creating policy scripts the need may arise
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to find the geographic location for an IP address. Bro has support
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for the `GeoIP library <http://www.maxmind.com/app/c>`__ at the
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policy script level beginning with release 1.3 to account for this
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need. To use this functionality, you need to first install the libGeoIP
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software, and then install the GeoLite city database before building
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Bro.
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.. contents::
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Install libGeoIP
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----------------
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* FreeBSD:
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.. console::
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sudo pkg_add -r GeoIP
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* RPM/RedHat-based Linux:
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.. console::
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sudo yum install GeoIP-devel
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* DEB/Debian-based Linux:
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.. console::
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sudo apt-get install libgeoip-dev
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* Mac OS X:
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Vanilla OS X installations don't ship with libGeoIP, but if
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installed from your preferred package management system (e.g.
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MacPorts, Fink, or Homebrew), they should be automatically detected
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and Bro will compile against them.
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GeoIPLite Database Installation
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------------------------------------
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A country database for GeoIPLite is included when you do the C API
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install, but for Bro, we are using the city database which includes
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cities and regions in addition to countries.
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`Download <http://www.maxmind.com/app/geolitecity>`__ the GeoLite city
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binary database.
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.. console::
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wget http://geolite.maxmind.com/download/geoip/database/GeoLiteCity.dat.gz
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gunzip GeoLiteCity.dat.gz
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Next, the file needs to be put in the database directory. This directory
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should already exist and will vary depending on which platform and package
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you are using. For FreeBSD, use ``/usr/local/share/GeoIP``. For Linux,
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use ``/usr/share/GeoIP`` or ``/var/lib/GeoIP`` (choose whichever one
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already exists).
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.. console::
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mv GeoLiteCity.dat <path_to_database_dir>/GeoIPCity.dat
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Usage
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-----
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There is a single built in function that provides the GeoIP
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functionality:
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.. code:: bro
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function lookup_location(a:addr): geo_location
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There is also the :bro:see:`geo_location` data structure that is returned
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from the :bro:see:`lookup_location` function:
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.. code:: bro
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type geo_location: record {
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country_code: string;
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region: string;
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city: string;
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latitude: double;
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longitude: double;
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};
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Example
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-------
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To write a line in a log file for every ftp connection from hosts in
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Ohio, this is now very easy:
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.. code:: bro
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global ftp_location_log: file = open_log_file("ftp-location");
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event ftp_reply(c: connection, code: count, msg: string, cont_resp: bool)
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{
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local client = c$id$orig_h;
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local loc = lookup_location(client);
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if (loc$region == "OH" && loc$country_code == "US")
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{
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print ftp_location_log, fmt("FTP Connection from:%s (%s,%s,%s)", client, loc$city, loc$region, loc$country_code);
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}
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}
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