>Which means that the IPv4 address _is_ on RBL, but Exim got it in
>IPv4-in-IPv6 notation, probably looked up a wrong reverse and let the spam
>flow in.
>
>You should simply look up IPv4 reverse for such addresses. I thought you
>did, but seems the other way.
Sigh, I think you are right. This patch is untested but I think it's along
roughly the right lines. Let me know if it helps any.
p.
--- exim-3.02/src/host.c Wed Jun 2 09:31:53 1999
+++ exim-3.02-1/src/host.c Fri Jul 23 14:16:44 1999
@@ -975,7 +975,13 @@
struct in6_addr addr6;
if (inet_pton(AF_INET6, address, &addr6) != 1)
log_write(0, LOG_PANIC_DIE, "unable to parse \"%s\"", address);
- hosts = gethostbyaddr((char *)(&addr6), sizeof(addr6), AF_INET6);
+ if (IN6_IS_ADDR_V4MAPPED(&addr6))
+ /* Ho ho! Turns out this is really an IPv4 address. Such mapped
+ addresses aren't included in the ip6.int domain so we must spot
+ them and use an IPv4 lookup. */
+ hosts = gethostbyaddr((char *)(&addr6)+12, sizeof(addr6), AF_INET);
+ else
+ hosts = gethostbyaddr((char *)(&addr6), sizeof(addr6), AF_INET6);
}
else
{
