dhclient: Ignore SIP servers DHCP option defined in RFC 3361

[michaelo]

Summary

Ignore SIP servers dhcp option to shut up the warning message.
This option is defined in the RFC 3361 and sent from NSD-G1000T router.

PR: 280119

[michaelo]

Fix formatting

[michaelo]

Formatting again

[jrm]

RFC 3361 declares 120 to be the code for the option, and this is doing the same thing as what's done for other unimplemented options, so this seems fine to me too. I'll add @brooks, a src committer who just touched dhclient, to be sure we're not missing something. Please make sure you use git commit --author to attribute Yuichiro NAITO in the commit logs.

[michaelo]

Please also note the discussion in the PR: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280119

[michaelo]

In D45873#1045890, @jrm wrote:

RFC 3361 declares 120 to be the code for the option, and this is doing the same thing as what's done for other unimplemented options, so this seems fine to me too. I'll add @brooks, a src committer who just touched dhclient, to be sure we're not missing something. Please make sure you use git commit --author to attribute Yuichiro NAITO in the commit logs.

Did that already, gave the reporter full credits.

[brooks]

Seems reasonable to me.