From a4fd83e9689ca07929a8a3a6cb8b7bde2b872649 Mon Sep 17 00:00:00 2001
From: Thomas Bernard <miniupnp@free.fr>
Date: Mon, 19 Aug 2013 18:49:09 +0200
Subject: [PATCH] minissdpd: update upnputils.c/.h

---
 minissdpd/upnputils.c | 82 +++++++++++++++++++++++++++++++++++++++++--
 minissdpd/upnputils.h | 10 ++++--
 2 files changed, 88 insertions(+), 4 deletions(-)

diff --git a/minissdpd/upnputils.c b/minissdpd/upnputils.c
index ec32d29..23ad242 100644
--- a/minissdpd/upnputils.c
+++ b/minissdpd/upnputils.c
@@ -1,13 +1,15 @@
-/* $Id: upnputils.c,v 1.5 2012/05/24 16:51:09 nanard Exp $ */
+/* $Id: upnputils.c,v 1.7 2013/04/20 09:03:18 nanard Exp $ */
 /* MiniUPnP project
  * http://miniupnp.free.fr/ or http://miniupnp.tuxfamily.org/
- * (c) 2006-2012 Thomas Bernard
+ * (c) 2006-2013 Thomas Bernard
  * This software is subject to the conditions detailed
  * in the LICENCE file provided within the distribution */
 
 #include "config.h"
 
 #include <stdio.h>
+#include <string.h>
+#include <syslog.h>
 #include <unistd.h>
 #include <fcntl.h>
 #include <sys/types.h>
@@ -19,6 +21,10 @@
 #endif
 
 #include "upnputils.h"
+#include "upnpglobalvars.h"
+#ifdef ENABLE_IPV6
+#include "getroute.h"
+#endif
 
 int
 sockaddr_to_string(const struct sockaddr * addr, char * str, size_t size)
@@ -83,3 +89,75 @@ set_non_blocking(int fd)
 	return 1;
 }
 
+struct lan_addr_s *
+get_lan_for_peer(const struct sockaddr * peer)
+{
+	struct lan_addr_s * lan_addr = NULL;
+
+#ifdef ENABLE_IPV6
+	if(peer->sa_family == AF_INET6)
+	{
+		struct sockaddr_in6 * peer6 = (struct sockaddr_in6 *)peer;
+		if(IN6_IS_ADDR_V4MAPPED(&peer6->sin6_addr))
+		{
+			struct in_addr peer_addr;
+			memcpy(&peer_addr, &peer6->sin6_addr.s6_addr[12], 4);
+			for(lan_addr = lan_addrs.lh_first;
+			    lan_addr != NULL;
+			    lan_addr = lan_addr->list.le_next)
+			{
+				if( (peer_addr.s_addr & lan_addr->mask.s_addr)
+				   == (lan_addr->addr.s_addr & lan_addr->mask.s_addr))
+					break;
+			}
+		}
+		else
+		{
+			int index = -1;
+			if(peer6->sin6_scope_id > 0)
+				index = (int)peer6->sin6_scope_id;
+			else
+			{
+				if(get_src_for_route_to(peer, NULL, NULL, &index) < 0)
+					return NULL;
+			}
+			syslog(LOG_DEBUG, "%s looking for LAN interface index=%d",
+			       "get_lan_for_peer()", index);
+			for(lan_addr = lan_addrs.lh_first;
+			    lan_addr != NULL;
+			    lan_addr = lan_addr->list.le_next)
+			{
+				syslog(LOG_DEBUG,
+				       "ifname=%s index=%u str=%s addr=%08x mask=%08x",
+				       lan_addr->ifname, lan_addr->index,
+				       lan_addr->str,
+				       ntohl(lan_addr->addr.s_addr),
+				       ntohl(lan_addr->mask.s_addr));
+				if(index == (int)lan_addr->index)
+					break;
+			}
+		}
+	}
+	else if(peer->sa_family == AF_INET)
+	{
+#endif
+		for(lan_addr = lan_addrs.lh_first;
+		    lan_addr != NULL;
+		    lan_addr = lan_addr->list.le_next)
+		{
+			if( (((const struct sockaddr_in *)peer)->sin_addr.s_addr & lan_addr->mask.s_addr)
+			   == (lan_addr->addr.s_addr & lan_addr->mask.s_addr))
+				break;
+		}
+#ifdef ENABLE_IPV6
+	}
+#endif
+
+	if(lan_addr)
+		syslog(LOG_DEBUG, "%s: found in LAN %s %s",
+		       "get_lan_for_peer()", lan_addr->ifname, lan_addr->str);
+	else
+		syslog(LOG_DEBUG, "%s: not found !", "get_lan_for_peer()");
+	return lan_addr;
+}
+
diff --git a/minissdpd/upnputils.h b/minissdpd/upnputils.h
index 9652cc0..26e2c0b 100644
--- a/minissdpd/upnputils.h
+++ b/minissdpd/upnputils.h
@@ -1,7 +1,7 @@
-/* $Id: upnputils.h,v 1.2 2012/02/06 16:21:24 nanard Exp $ */
+/* $Id: upnputils.h,v 1.4 2013/02/06 10:50:04 nanard Exp $ */
 /* MiniUPnP project
  * http://miniupnp.free.fr/ or http://miniupnp.tuxfamily.org/
- * (c) 2011-2012 Thomas Bernard
+ * (c) 2011-2013 Thomas Bernard
  * This software is subject to the conditions detailed
  * in the LICENCE file provided within the distribution */
 
@@ -23,5 +23,11 @@ sockaddr_to_string(const struct sockaddr * addr, char * str, size_t size);
 int
 set_non_blocking(int fd);
 
+/**
+ * get the LAN which the peer belongs to
+ */
+struct lan_addr_s *
+get_lan_for_peer(const struct sockaddr * peer);
+
 #endif