From 21ba59f8197dba0a72dbf5186bc0a5d7e5074496 Mon Sep 17 00:00:00 2001
From: Florian Forster <octo@collectd.org>
Date: Thu, 11 Jun 2015 07:46:54 +0100
Subject: [PATCH] dns plugin: Check for "struct ip6_ext".

Solaris appears to declare the struct, but only when The Right defines
are specified at compile time. As a quick and dirty fix, only build with
IPv6 support when the struct is usable.

Fixes: #348
---
 configure.ac    | 18 ++++++++++++++++++
 src/utils_dns.c | 12 ++++++++----
 2 files changed, 26 insertions(+), 4 deletions(-)

diff --git a/configure.ac b/configure.ac
index 554a58bf..8572749f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -276,6 +276,24 @@ AC_CHECK_HEADERS(netinet/udp.h, [], [],
 #endif
 ])
 
+AC_CHECK_TYPES([struct ip6_ext], [], [],
+[#if HAVE_STDINT_H
+# include <stdint.h>
+#endif
+#if HAVE_SYS_TYPES_H
+# include <sys/types.h>
+#endif
+#if HAVE_NETINET_IN_SYSTM_H
+# include <netinet/in_systm.h>
+#endif
+#if HAVE_NETINET_IN_H
+# include <netinet/in.h>
+#endif
+#if HAVE_NETINET_IP6_H
+# include <netinet/ip6.h>
+#endif
+])
+
 # For cpu modules
 AC_CHECK_HEADERS(sys/dkstat.h)
 if test "x$ac_system" = "xDarwin"
diff --git a/src/utils_dns.c b/src/utils_dns.c
index 655c61ed..fcc65a56 100644
--- a/src/utils_dns.c
+++ b/src/utils_dns.c
@@ -129,6 +129,10 @@
 # error "`struct udphdr' is unusable."
 #endif
 
+#if HAVE_NETINET_IP6_H && HAVE_STRUCT_IP6_EXT
+# define HAVE_IPV6 1
+#endif
+
 #include "utils_dns.h"
 
 /*
@@ -444,7 +448,7 @@ handle_udp(const struct udphdr *udp, int len)
     return 1;
 }
 
-#if HAVE_NETINET_IP6_H
+#if HAVE_IPV6
 static int
 handle_ipv6 (struct ip6_hdr *ipv6, int len)
 {
@@ -513,16 +517,16 @@ handle_ipv6 (struct ip6_hdr *ipv6, int len)
 
     return (1); /* Success */
 } /* int handle_ipv6 */
-/* #endif HAVE_NETINET_IP6_H */
+/* #endif HAVE_IPV6 */
 
-#else /* if !HAVE_NETINET_IP6_H */
+#else /* if !HAVE_IPV6 */
 static int
 handle_ipv6 (__attribute__((unused)) void *pkg,
 	__attribute__((unused)) int len)
 {
     return (0);
 }
-#endif /* !HAVE_NETINET_IP6_H */
+#endif /* !HAVE_IPV6 */
 
 static int
 handle_ip(const struct ip *ip, int len)
-- 
2.11.0