tree 3009ac24eebfa656d3ec539c12912d26c5999ff2
parent d771bbc56428dde44d98a5deb1696061924854e6
author David Crawshaw <crawshaw@google.com> 1489596914 -0400
committer David Crawshaw <crawshaw@google.com> 1489677648 -0400

dhcp: small client fixes and more debugging

Accept hops values from servers not equal to zero. (The spec allows
this, and I found a corp DHCP server that sends these.)

Clear siaddr and giaddr when sending DHCPREQUEST. Servers are good
about ignoring these values, but technically they should be zero.

Lots of string printing for DHCP headers, which is useful in debugging.
I will probably export the header type in some future CL for use
in the netdbg tool.

Change-Id: I8cb3f9b92d9ddd9d2fb2ce8eb25348195396cffe