A bind with a port of zero will bind you to a free port. Is this portable?

It's universal as far as I know, but I can't find any text in the standards that says it is. An alternative that might be more portable is using getaddrinfo with null service name pointers and the AI_PASSIVE flag. This is guaranteed to give you an sockaddr you can bind to.

It's also the correct way to let the administrator choose which local ip (v4 or v6) address to bind to.

It's certainly "standard" in the 4.2BSD socket API from which most every other implementation is derived, but I'm not aware of any formal specification that actually says so.

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