Feature #6394: Support SO_ORIGINAL_DST socket option

[Min-Cheng Chan]

In Linux, SOORIGINALDST provides the original packet destination, which is very useful when packet is translated by NAT.
In C, this information can be obtained by getsockopt(fd, SOLIP, SOORIGINALDST, &remote, &remotelen);
However, current Ruby Socket class does not provide this option.
Please consider adding this option into Ruby.

By the way, I am still working on the patch file.
This option is named with SO_ prefix. However it is an IP layer option (SOL_IP).
ext/socket/mkconstants.rb seems to generate options according to the option prefix, which goes wrong in this case.

[Yusuke Endoh]

• Status changed from Open to Assigned
• Assignee set to Akira Tanaka

[Yusuke Endoh]

• Target version set to next minor