In your previous mail you wrote:
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 ?
=> RFC 2133 had it:
An application may use IPV6_ADDRFORM with getsockopt() to learn
whether an open socket is a PF_INET of PF_INET6 socket. For example:
int addrform;
size_t len = sizeof(addrform);
if (getsockopt(s, IPPROTO_IPV6, IPV6_ADDRFORM,
(char *) &addrform, &len) == -1)
perror("getsockopt IPV6_ADDRFORM");
else if (addrform == PF_INET)
printf("This is an IPv4 socket.\n");
else if (addrform == PF_INET6)
printf("This is an IPv6 socket.\n");
else
printf("This system is broken.\n");
But RFC 2553 (which obsoletes RFC 2133) has removed it:
Section 5.1: The IPV6_ADDRFORM socket option was removed.
I believe it is because of the setsockopt() (too hard to implement)
but the getsockopt() is still useful. You should ask for it in the
IPng IETF WG mailing-list because the successor of RFC 2553 is being
discussed these days.
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