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Ignore DNS queries from port 0: http://www.ietf.org/mail-archive/web/dnsop/current/msg11441.html

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Simon Kelley
2014-03-22 19:18:06 +00:00
parent 3e21a1a6fa
commit 2a7a2b84ec
1 changed files with 16 additions and 3 deletions
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19
src/forward.c
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@@ -1076,11 +1076,24 @@ void receive_query(struct listener *listen, time_t now)
return; return;
source_addr.sa.sa_family = listen->family; source_addr.sa.sa_family = listen->family;
if (listen->family == AF_INET)
{
/* Source-port == 0 is an error, we can't send back to that.
http://www.ietf.org/mail-archive/web/dnsop/current/msg11441.html */
if (source_addr.in.sin_port == 0)
return;
}
#ifdef HAVE_IPV6 #ifdef HAVE_IPV6
if (listen->family == AF_INET6) else
source_addr.in6.sin6_flowinfo = 0; {
/* Source-port == 0 is an error, we can't send back to that. */
if (source_addr.in6.sin6_port == 0)
return;
source_addr.in6.sin6_flowinfo = 0;
}
#endif #endif
/* We can be configured to only accept queries from at-most-one-hop-away addresses. */ /* We can be configured to only accept queries from at-most-one-hop-away addresses. */
if (option_bool(OPT_LOCAL_SERVICE)) if (option_bool(OPT_LOCAL_SERVICE))
{ {