From 0bd83922cc17a79de74067b29fa83a1c306015a4 Mon Sep 17 00:00:00 2001
From: Yves Mettier <ymettier@free.fr>
Date: Mon, 4 Aug 2014 14:01:01 +0200
Subject: [PATCH] Fix for 'linux/inet_diag.h: No such file or directory'

---
 configure.in   | 19 +++++++++++++++++++
 src/tcpconns.c | 13 +++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/configure.in b/configure.in
index ce59b71d..84d017a4 100644
--- a/configure.in
+++ b/configure.in
@@ -399,6 +399,18 @@ AC_CHECK_HEADERS(linux/if.h, [], [],
 #  include <sys/socket.h>
 #endif
 ])
+AC_CHECK_HEADERS(linux/inet_diag.h, [], [],
+[
+#if HAVE_SYS_TYPES_H
+#  include <sys/types.h>
+#endif
+#if HAVE_SYS_SOCKET_H
+#  include <sys/socket.h>
+#endif
+#if HAVE_LINUX_INET_DIAG_H
+# include <linux/inet_diag.h>
+#endif
+])
 AC_CHECK_HEADERS(linux/netdevice.h, [], [],
 [
 #if HAVE_SYS_TYPES_H
@@ -1242,6 +1254,13 @@ AC_CHECK_MEMBERS([struct net_device_stats.rx_bytes, struct net_device_stats.tx_p
 	#include <linux/if.h>
 	#include <linux/netdevice.h>
 	])
+AC_CHECK_MEMBERS([struct inet_diag_req.id, struct inet_diag_req.idiag_states],
+	[AC_DEFINE(HAVE_STRUCT_LINUX_INET_DIAG_REQ, 1, [Define if struct inet_diag_req exists and is usable.])],
+	[],
+	[
+	#include <linux/inet_diag.h>
+	])
+
 
 AC_CHECK_MEMBERS([struct ip_mreqn.imr_ifindex], [],
 	[],
diff --git a/src/tcpconns.c b/src/tcpconns.c
index 765b892e..6351c7b6 100644
--- a/src/tcpconns.c
+++ b/src/tcpconns.c
@@ -74,7 +74,9 @@
 /* sys/socket.h is necessary to compile when using netlink on older systems. */
 # include <sys/socket.h>
 # include <linux/netlink.h>
+#if HAVE_LINUX_INET_DIAG_H
 # include <linux/inet_diag.h>
+#endif
 # include <sys/socket.h>
 # include <arpa/inet.h>
 /* #endif KERNEL_LINUX */
@@ -137,10 +139,12 @@
 #endif /* KERNEL_AIX */
 
 #if KERNEL_LINUX
+#if HAVE_STRUCT_LINUX_INET_DIAG_REQ
 struct nlreq {
   struct nlmsghdr nlh;
   struct inet_diag_req r;
 };
+#endif
 
 static const char *tcp_state[] =
 {
@@ -276,7 +280,12 @@ static int port_collect_listening = 0;
 static port_entry_t *port_list_head = NULL;
 
 #if KERNEL_LINUX
+#if HAVE_STRUCT_LINUX_INET_DIAG_REQ
+/* This depends on linux inet_diag_req because if this structure is missing,
+ * sequence_number is useless and we get a compilation warning.
+ */
 static uint32_t sequence_number = 0;
+#endif
 
 enum
 {
@@ -446,6 +455,7 @@ static int conn_handle_ports (uint16_t port_local, uint16_t port_remote, uint8_t
  * zero on other errors. */
 static int conn_read_netlink (void)
 {
+#if HAVE_STRUCT_LINUX_INET_DIAG_REQ
   int fd;
   struct sockaddr_nl nladdr;
   struct nlreq req;
@@ -574,6 +584,9 @@ static int conn_read_netlink (void)
 
   /* Not reached because the while() loop above handles the exit condition. */
   return (0);
+#else
+  return (1);
+#endif /* HAVE_STRUCT_LINUX_INET_DIAG_REQ */
 } /* int conn_read_netlink */
 
 static int conn_handle_line (char *buffer)
-- 
2.30.2