check if libpcap has PCAP_ERROR_IFACE_NOT_UP

This should prevent DNS plugin from being built on systems with libpcap
older than 1.0.0.

GitHub issue #373

diff --git a/configure.in b/configure.in
index a62d608bf21fe35ac40df7662f6c64ea67a24264..6b4372031a351ac07cd602b21fe5c3c6befd91be 100644 (file)
--- a/configure.in
+++ b/configure.in
@@ -3013,6 +3013,25 @@ then
        AC_CHECK_HEADERS(pcap-bpf.h,,
                         [with_libpcap="no (pcap-bpf.h not found)"])
 fi
+if test "x$with_libpcap" = "xyes"
+then
+       AC_CACHE_CHECK([whether libpcap has PCAP_ERROR_IFACE_NOT_UP],
+                      [c_cv_libpcap_have_pcap_error_iface_not_up],
+                      AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
+[[[
+#include <pcap.h>
+]]],
+[[[
+  int val = PCAP_ERROR_IFACE_NOT_UP;
+]]]
+                      )],
+                      [c_cv_libpcap_have_pcap_error_iface_not_up="yes"],
+                      [c_cv_libpcap_have_pcap_error_iface_not_up="no"]))
+fi
+if test "x$c_cv_libpcap_have_pcap_error_iface_not_up" != "xyes"
+then
+               with_libpcap="no (pcap.h misses PCAP_ERROR_IFACE_NOT_UP)"
+fi
 AM_CONDITIONAL(BUILD_WITH_LIBPCAP, test "x$with_libpcap" = "xyes")
 # }}}