Warning: This module is still testing, please use it carefully in the real environment.
This is a NSS module which can map a single hostname to multiple IPs.
I have a laptop and a NAS in my dormitory, and I need to switch my Wireguard VPN on my laptop frequently when I go out/get back, so I have to define three different host names mapping for public/private/wireguard ip for NAS, and use it depending on where I am or whether VPN is enabled. That is so tired!
Therefore, I come up with the idea that I can map a hostname to a fallback ip list, it can search through every fallback ip and check if the conditions are met, e.g, network interface.
Now I can happily use a single hostname to connect to my machine without worrying about which hostname I should use!
make
sudo make installThe configuration file default is /etc/host2ips
And you have to modify /etc/nsswitch.conf to insert the module.
e.g. /etc/nsswitch.conf
hosts: host2ips files dns
Sample of the config file:
# my host host foo.bar 192.168.0.66 eth0 192.168.0.77 10.0.0.66 wg0 10.0.0.77 # my host2 host foo2.bar 192.168.1.22 eth1 192.168.1.23 10.0.1.22 wg1 - 123.123.123.1 - -
- Comment begins with
#, currently does not support mixing comment and config - To define new host, begins with ‘host’ and the hostname
- A host can have multiple fallback ips, the ip is used when all the conditions are satified
- inteface name: specify the interface name
- interface ip: specify the interface ip
-denotes don’t-care value
warning: don’t put any trailing spaces in each line
- write test scripts
- support host aliases
- support IPv6
- support more NSS lookup functions, e.g,
gethostbyaddr() - support putting comments after line