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For majority of applications, supporting IPv6 boils down to using getaddrinfo()/getnameinfo() instead of gethostbyname()/gethostbyaddr(), which results in code

by dfox 10y ago

For majority of applications, supporting IPv6 boils down to using getaddrinfo()/getnameinfo() instead of gethostbyname()/gethostbyaddr(), which results in code that supports both IPv4 and IPv6 and is simpler than the IPv4-only original.

rwmj 10y ago
The catch is you also have to be prepared to listen on multiple sockets. There are lots of servers out there which get this wrong, including qemu-nbd. For reference here's my implementation of this which (I think) gets it right: https://github.com/libguestfs/nbdkit/blob/master/src/sockets.c#L105 https://github.com/libguestfs/nbdkit/blob/master/src/sockets...
mvkg 10y ago
A good dual-stack implementation should also support Happy Eyeballs which does not result in simpler code.