Package dhcp4 is an IPv4 DHCP library as described in RFC 2131, 2132, and 3396.
It implements encoding and decoding of DHCP messages in dhcp4. Option parsing is in the dhcp4opts package; a simple client is included in dhcp4client. Some day, there may be a server.
If you are already using another IPv4 DHCP library like krolaw's, you can still use dhcp4opts to decode options not implemented in krolaw's DHCP library.