Socket_Bind() To More Than One Ip:port ?

[AliceWonder32]

Working on php socket server. New to sockets.

Would love to support IPv6 in addition to IPv4.

Sure, I could proxy IPv6 requests to IPv4 but I'd rather not.

 

Can I bind the same socket to more than one IP:port ??

[requinix]

Nope. You could bind to a port only though.

[kicken]

If you bind to 0.0.0.0 then it will bind to all available IPv4 addresses. There is probably something similar for IPv6 but I do not know it off the top of my head.

 

To sort of address the question in a general sense though, I'm pretty sure you'd need one socket for each protocol. If you wanted to bind specific addresses rather than "all addresses" I'm pretty sure you'd need a socket for each address/port combo.

 

[requinix]

To sort of address the question in a general sense though, I'm pretty sure you'd need one socket for each protocol. If you wanted to bind specific addresses rather than "all addresses" I'm pretty sure you'd need a socket for each address/port combo.

That's spot-on. I was thinking of 0.0.0.0 but that's only IPv4. The underlying constants for binding (on Linux) AF_INET and AF_INET6 so that requires two calls to bind(). So actually no, it's definitely not possible to listen to both IPv4 and IPv6 - unless there's something which hides that kind of detail from you.

Edited October 22, 2012 by requinix

[AliceWonder32]

Thanks. I wonder if a pecl wrapper could be written to solve this issue, e.g. the wrapper provides something that looks and behaves like a socket but proxies multiple sockets, so you create and bind multiple sockets, and then the wrapper socket listens on them much like binding to 0.0.0.0:port would do.