From bbb27ab97d1a0d56429701f32e1c720f3ec940ff Mon Sep 17 00:00:00 2001
From: Thomas Bernard <miniupnp@free.fr>
Date: Fri, 26 May 2017 12:08:03 +0200
Subject: [PATCH] miniupnpc-async: retrieve our ip address

---
 miniupnpc-async/miniupnpc-async.c |  7 +++++++
 miniupnpc-async/miniupnpc-async.h |  5 +++++
 miniupnpc-async/testasync.c       | 12 +++++++++++-
 3 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/miniupnpc-async/miniupnpc-async.c b/miniupnpc-async/miniupnpc-async.c
index 0ef3559..602ee18 100644
--- a/miniupnpc-async/miniupnpc-async.c
+++ b/miniupnpc-async/miniupnpc-async.c
@@ -402,6 +402,13 @@ static int upnpc_send_request(upnpc_device_t * p)
 		"Connection: Close\r\n"
 		"User-Agent: MiniUPnPc-async\r\n"
 		"\r\n";
+
+	/* retrieve "our" IP address used to connect to the UPnP device */
+	p->selfaddrlen = sizeof(struct sockaddr_storage);
+	if(getsockname(p->http_socket, (struct sockaddr *)&p->selfaddr, &p->selfaddrlen) < 0) {
+		PRINT_SOCKET_ERROR("getsockname()");
+	}
+
 	if(p->http_request == NULL) {
 		char hostname[MAXHOSTNAMELEN+1];
 		unsigned short port;
diff --git a/miniupnpc-async/miniupnpc-async.h b/miniupnpc-async/miniupnpc-async.h
index d4eff71..91f5378 100644
--- a/miniupnpc-async/miniupnpc-async.h
+++ b/miniupnpc-async/miniupnpc-async.h
@@ -17,6 +17,9 @@
 #ifndef MINIUPNPC_ASYNC_H_INCLUDED
 #define MINIUPNPC_ASYNC_H_INCLUDED
 
+/* for struct sockaddr_storage */
+#include <netinet/in.h>
+
 #include "declspec.h"
 #include "upnpreplyparse.h"
 
@@ -64,6 +67,8 @@ typedef struct upnpc_device {
 	int http_response_chunked;
 	int http_response_code;
 	struct NameValueParserData soap_response_data;
+	struct sockaddr_storage selfaddr;
+	socklen_t selfaddrlen;
 } upnpc_device_t;
 
 typedef struct {
diff --git a/miniupnpc-async/testasync.c b/miniupnpc-async/testasync.c
index 9a970e3..b940618 100644
--- a/miniupnpc-async/testasync.c
+++ b/miniupnpc-async/testasync.c
@@ -17,6 +17,10 @@
 #include <stdio.h>
 #include <string.h>
 #include <sys/select.h>
+/* for getnameinfo() : */
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netdb.h>
 /* compile with -DUPNPC_USE_SELECT to enable upnpc_select_fds() function */
 #include "miniupnpc-async.h"
 #include "upnpreplyparse.h"
@@ -30,6 +34,7 @@ enum methods {
 
 int main(int argc, char * * argv)
 {
+	char ip_address[64];
 	int r, n;
 	upnpc_t upnp;
 	const char * multicastif = NULL;
@@ -120,10 +125,15 @@ int main(int argc, char * * argv)
 				next_method_to_call = EAddPortMapping;
 				break;
 			case EAddPortMapping:
+				if(getnameinfo((struct sockaddr *)&upnp.device_list->selfaddr, upnp.device_list->selfaddrlen,
+				               ip_address, sizeof(ip_address), NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV) < 0) {
+					fprintf(stderr, "getnameinfo() failed\n");
+				}
+				printf("our IP address is %s\n", ip_address);
 				printf("AddPortMapping\n");
 				upnpc_add_port_mapping(upnp.device_list,	/* XXX */
                            NULL /* remote_host */, 40002 /* ext_port */,
-                           42042 /* int_port */, "192.168.1.202" /* int_client */,
+                           42042 /* int_port */, ip_address /* int_client */,
                            "TCP" /* proto */, "this is a test" /* description */,
                            0 /* lease duration */);
 				next_method_to_call = ENothing;