A simple client to update DNS record from a remote client to a DNS server using nsupdate protocol, like No-IP or DynDNS for your own domain names.
Tested on Linux and OSX.
- A DNS Server configured to accept updates (see below)
- Firewall with port 53/UDP open on the server
- dnsutils package on your server & clients
Generate a public/private key pair:
dnssec-keygen -a HMAC-MD5 -b 512 -n HOST www.domain.com.
Configure your DNS zone like this:
zone "domain.com" {
type master;
file "/etc/bind/domain.com.hosts";
allow-update { key "www.domain.com."; };
};
key "www.domain.com" {
algorithm hmac-md5;
secret "the-value-of-the-generated-key-that-you-can-see-in-public-and-private-keys ==";
};
Restart your DNS Server
/etc/init.d/bind9 restart
Clone the project
git clone git@github.com:tomav/nsupdate-client.git
Copy the generated public/private keys on your machine. They must not be separated.
And then choose the command that fit your needs:
With static IP
./nsupdate-client -k Kdomain.com+xxxxxx.private -r sub.domain.com -l 600 -t A -d 192.168.1.100
With internal dynamic IP (where ethX is your interface name, like eth0, en1, ppp2...)
./nsupdate-client -k Kdomain.com+xxxxxx.private -r sub.domain.com -l 600 -t A -d if_ethX
With external dynamic IP
./nsupdate-client -k Kdomain.com+xxxxxx.private -r sub.domain.com -l 600 -t A -d external
With CNAME
./nsupdate-client -k Kdomain.com+xxxxxx.private -r sub.domain.com -l 600 -t CNAME domain.com