From fef77d93b7c38b5f0fe89e7c01e3e92a616f2606 Mon Sep 17 00:00:00 2001
From: David Shaw <dshaw@jabberwocky.com>
Date: Thu, 13 Nov 2003 01:06:40 +0000
Subject: [PATCH] * configure.ac: Make sure that the resolver API actually
 compiles, and not just that the right functions exist.

---
 ChangeLog    |  5 +++++
 configure.ac | 15 ++++++++++++++-
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index 1c6b15ea7..47839675a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2003-11-12  David Shaw  <dshaw@jabberwocky.com>
+
+	* configure.ac: Make sure that the resolver API actually compiles,
+	and not just that the right functions exist.
+
 2003-10-30  David Shaw  <dshaw@jabberwocky.com>
 
 	* configure.ac: Locate libbz2 for bzip2 compression support.
diff --git a/configure.ac b/configure.ac
index 88cb3501d..cc63901b1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -460,11 +460,24 @@ if test x"$try_hkp" = xyes && test x"$use_dns_srv" = xyes ; then
   AC_SEARCH_LIBS(dn_skipname,resolv bind,,
                  AC_SEARCH_LIBS(__dn_skipname,resolv bind,,use_dns_srv=no))
 
+  if test x"$use_dns_srv" = xyes ; then
+
+    # Make sure that the BIND 4 resolver interface is workable before
+    # enabling SRVs.  At some point I'll rewrite the code to use the
+    # BIND 8 resolver API.
+
+    AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <sys/types.h>
+#include <netinet/in.h>
+#include <arpa/nameser.h>
+#include <resolv.h>],
+[[unsigned char answer[PACKETSZ]; res_query("foo.bar",C_IN,T_A,answer,PACKETSZ);]])],,use_dns_srv=no)
+  fi
+
   if test x"$use_dns_srv" = xyes ; then
      AC_DEFINE(USE_DNS_SRV,1,[define to use DNS SRV])
      SRVLIBS=$LIBS
   else
-     AC_MSG_WARN([Resolver functions not found.  Disabling DNS SRV.])
+     AC_MSG_WARN([Resolver functions not found or not usable.  Disabling DNS SRV.])
   fi
   LIBS=$_srv_save_libs
 fi