This vmod used the Hello World vmod (https://github.com/varnish/libvmod-example/tree/master) as a base for a vmod, and draws heavily on simonvik's MaxMind DB VMOD (https://github.com/simonvik/libvmod_maxminddb). You will need to purchase the IP2Location database and install the C class from their developer library to your sever.

1. pkg-config
2. build-essential
3. autoconf
4. libtool
5. python-docutils
6. varnish
7. libvarnishapi-dev

1. Varnish needs to be installed, and the Varnish source available. (e.g., if installed from the Debian repo, after following the installation instructions on http://varnish-cache.org, Make sure there is a deb-rc line similar to: deb-src https://repo.varnish-cache.org/debian/ wheezy varnish-4.0 in your /etc/apt/sources.list.d/varnish-cache.list. This allows you to get the source for your installed package using sudo apt-get source varnish)
2. IP2Location needs to be built and installed on the system. The source can be gotten from the Ip2Location website
3. IP2Location database needs to be placed in the VMOD directory. You will be able to specify the exact location and binfile in your VCL.

./autogen.sh
./configure VARNISHSRC=DIR [VMODDIR=DIR]

VARNISHSRC is the directory of the Varnish source tree for which to compile your vmod. Both the VARNISHSRC and VARNISHSRC/include will be added to the include search paths for your module.

Optionally you can also set the vmod install directory by adding VMODDIR=DIR (defaults to the pkg-config discovered directory from your Varnish installation).

Make targets:

• make - builds the vmod
• make install - installs your vmod in VMODDIR

import ip2location;

sub vcl_init{
  ip2location.init_db("/path/to/ip2location_db.bin");
}

sub vcl_recv {
  set req.http.X-Time-Zone = ip2location.lookup_tz(client.ip);
  set req.http.X-Country = ip2location.lookup_country(client.ip);
  set req.http.X-Country-Long = ip2location.lookup_country_long(client.ip);
  set req.http.X-Region = ip2location.lookup_region(client.ip);
  set req.http.X-City = ip2location.lookup_city(client.ip);
  set req.http.X-ISP = ip2location.lookup_isp(client.ip);
  set req.http.X-Domain = ip2location.lookup_domain(client.ip);
  set req.http.X-Zipcode = ip2location.lookup_zipcode(client.ip);
  set req.http.X-Netspeed = ip2location.lookup_netspeed(client.ip);
  set req.http.X-IDDCode = ip2location.lookup_iddcode(client.ip);
  set req.http.X-Area-Code = ip2location.lookup_areacode(client.ip);
  set req.http.X-Weatherstation-Code = ip2location.lookup_weatherstationcode(client.ip);
  set req.http.X-Weatherstation-Name = ip2location.lookup_weatherstationname(client.ip);
  set req.http.X-MCC = ip2location.lookup_mcc(client.ip);
  set req.http.X-MNC = ip2location.lookup_mnc(client.ip);
  set req.http.X-Mobile-Brand = ip2location.lookup_mobilebrand(client.ip);
  set req.http.X-Usage-Type = ip2location.lookup_usagetype(client.ip);
}