From 55dbbab5ebbf17bd6cf08d0dfd62ed1fec1e835e Mon Sep 17 00:00:00 2001
From: Miroslav Lichvar <mlichvar@redhat.com>
Date: Mon, 12 Oct 2015 11:44:21 +0200
Subject: [PATCH] configure: check for struct in_pktinfo with ipi_spec_dst

On NetBSD there is a struct in_pktinfo, but it doesn't have the
ipi_spec_dst field and it breaks compilation.
---
 configure | 7 +++++++
 ntp_io.c  | 6 +++---
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/configure b/configure
index 4498e0f..3142149 100755
--- a/configure
+++ b/configure
@@ -519,6 +519,13 @@ if test_code '<inttypes.h>' 'inttypes.h' '' '' ''; then
   add_def HAVE_INTTYPES_H
 fi
 
+if test_code 'struct in_pktinfo' 'sys/socket.h netinet/in.h' '' '' '
+  struct in_pktinfo ipi;
+  return sizeof (ipi.ipi_spec_dst.s_addr) + IP_PKTINFO;'
+then
+  add_def HAVE_IN_PKTINFO
+fi
+
 if [ $feat_ipv6 = "1" ] && \
   test_code 'IPv6 support' 'arpa/inet.h sys/socket.h netinet/in.h' '' "$EXTRA_LIBS" '
     struct sockaddr_in6 n;
diff --git a/ntp_io.c b/ntp_io.c
index 68741ec..24b1190 100644
--- a/ntp_io.c
+++ b/ntp_io.c
@@ -189,7 +189,7 @@ prepare_socket(int family, int port_number, int client_only)
 #endif
 
   if (family == AF_INET) {
-#ifdef IP_PKTINFO
+#ifdef HAVE_IN_PKTINFO
     /* We want the local IP info on server sockets */
     if (setsockopt(sock_fd, IPPROTO_IP, IP_PKTINFO, (char *)&on_off, sizeof(on_off)) < 0) {
       LOG(LOGS_ERR, LOGF_NtpIO, "Could not set packet info socket option");
@@ -533,7 +533,7 @@ read_from_socket(void *anything)
     local_addr.sock_fd = sock_fd;
 
     for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
-#ifdef IP_PKTINFO
+#ifdef HAVE_IN_PKTINFO
       if (cmsg->cmsg_level == IPPROTO_IP && cmsg->cmsg_type == IP_PKTINFO) {
         struct in_pktinfo ipi;
 
@@ -631,7 +631,7 @@ send_packet(void *packet, int packetlen, NTP_Remote_Address *remote_addr, NTP_Lo
   msg.msg_flags = 0;
   cmsglen = 0;
 
-#ifdef IP_PKTINFO
+#ifdef HAVE_IN_PKTINFO
   if (local_addr->ip_addr.family == IPADDR_INET4) {
     struct cmsghdr *cmsg;
     struct in_pktinfo *ipi;