>> Isn't the returned address simply a IPv6-mapped IPv4 address (::ffff:1.2.3.4) ? You can test it with IN6_IS_ADDR_V4MAPPED.
> Yes, it is (I've verified with the provided macro) ! I'll use this macro to detect and update provided addresses, thanks !
Testing more carefully, no it actually seems NOT to be IPv4-mapped addresses !
I test it like this :
static struct sockaddr *fix_adr(struct sockaddr *addr)
{
if (addr->sa_family != AF_INET6) {
log_info("not an IPv6 address, nothing to do\n");
return addr;
}
struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *) &addr;
if (! IN6_IS_ADDR_V4MAPPED(&(addr6->sin6_addr))) {
log_warn("@IP v6 '%s' is NOT an IPv4-mapped address !",
addr_ntoa(addr));
}
// convert it to ipv4 addr...
...
}
I get messages like :
@IP v6 '10.7.11.132' is NOT an IPv4-mapped address!
(the addr_ntoa() function uses getnameinfo(..., NI_NUMERICHOST) to retrieve ascii notation from given sockaddr address).
I'm not fluent with IPv6 addressing, so I don't know what to check...
Fred.
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