dhcpclient
A DHCP client for linux 2.6, using modern kernel features, (c) 2006 Stefan Rompf.
Motivation
Using a notebook, I'm often traveling between different networks. After replugging, I always needed to issue a ifdown/ifup sequence because the DHCP client did not realize the temporary disconnection. This is an unneeded limitation because since 2.6, the kernel notifies userspace of these disconnection/reconnection events. Actually is was me who implemented this feature.
Beginning with 2.6.17, the linux kernel will allow userspace to influence this signalling, so that for example a wpa supplicant can tell the dhcpclient that an association has finished and the client should try to get an IP address.
Of course, you need software that support this feature. Unfortunately, most existing DHCP clients implemented their statemachine using siglongjmp() or one huge function, so there was no easy way extending them. So I wrote a new one.
Features
- RFC2131 compatible DHCP client, tested with ISC dhcpd directly and via a Cisco IOS relay agent, Cisco IOS DHCP server and dnsmasq.
- uses netlink for interface configuration
- does act on link state messages
- calls a script on every state change to allow updating resolv.conf etc
- small, compiles with [1]uclibc
Status
Currently, this is alpha software. It shouldn't be used in production environment, but I'm looking forward for people who like to test it in different environments and for (reasonable ;-) feature suggestions!
Support
The webpage is at [2]http://www.flamewarmaster.de/software/dhcpclient/
There is a mailing list available on [3]http://www.flamewarmaster.de/mailman/listinfo/dhcpclient/
References
- http://www.uclibc.org/
- http://www.flamewarmaster.de/software/dhcpclient/
- http://www.flamewarmaster.de/mailman/listinfo/dhcpclient/