>I am looking for a way to make code between ipv4 and ipv6 having less
>ifdef's. What I (think I) need is a way to find out the PF_xxx of a
>socket socket. Much like:
>if (do6)
> s = socket(PF_INET6, ...);
>else
> s = socket(PF_INET, ...);
>setsockopt(s, IPPROTO_IPvX(s), ...);
>I want to write the macro IPPROTO_IPvX(s), returning IPPROTO_IP if the
>socket's domain is PF_INET and IPPROTO_IPV6 if it's PF_INET6.
>I have been going trhough rfc2553 but couldn't find it. Does anybody
>have a clue ?
how's this?
itojun
int
IPPROTO_IPvX(s)
int s;
{
struct sockaddr_storage ss;
socklen_t sslen;
sslen = sizeof(ss);
getsockname(s, (struct sockaddr *)&ss, &sslen);
switch (ss.ss_family) {
case AF_INET:
return IPPROTO_IP;
case AF_INET6:
return IPPROTO_IPV6;
default:
return -1;
}
}
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