Add support for the IP_SENDSRCADDR control message #1776
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asomers
requested changes
Aug 4, 2022
This control message (actually just an alias for IP_RECVDSTADDR) sets the IPv4 source address when used with sendmsg. It is available on FreeBSD, NetBSD, OpenBSD, and DragonFlyBSD.
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This control message is available on FreeBSD, NetBSD, and OpenBSD. When used with
sendmsg, it sets the IPv4 source address. This adds support through a newControlMessage::Ipv4SendSrcAddrvariant that complementsControlMessageOwned::Ipv4RecvDstAddr.A few notes:
IP_SENDSRCADDRis actually just an alias forIP_RECVDSTADDR(though the code doesn't depend on this).IP_PKTINFOcan be used to accomplish the same thing and is already supported by nix. On FreeBSD and OpenBSD, though,IP_SENDSRCADDRis the only method I'm aware of.IP_SENDSRCADDR.I'll add a change-log entry once I see the PR number.
Thanks!