A lot of Cisco stuff added

FossilOrigin-Name: ea4edc78cae6fe99d7b4b29d95a8c30a4672d1d1448c0597f5e65e2a74138b9b

src/cw/cw_detect_nat.c

@@ -0,0 +1,39 @@
+
+#include <sys/socket.h>
+
+#include "dbg.h"
+#include "cw.h"
+
+/**
+ * @brief Detect NAT after a join/discovery request
+ * @param conn Connection object
+ * @retval 1 NAT detected
+ * @retval 0 no NAT was detected
+ */
+int cw_detect_nat(struct conn *conn)
+{
+	cw_KTV_t * result;
+	
+	char local_str[128];
+	char remote_str[128];
+
+	result = cw_ktv_get(conn->remote_cfg,"capwap-local-ip-address",CW_TYPE_IPADDRESS);
+	if (result == NULL){
+		cw_dbg(DBG_WARN,"Can't detect NAT. No local IP from peer received.");
+		return 0;
+	}
+
+	/* convert remote connected and sent ip addresse to 
+	 * strings */
+	 
+	sock_addrtostr((struct sockaddr*)&conn->addr,local_str,128,0);
+	result->type->to_str(result,remote_str,128);
+	
+	
+	/* if connected and sent address is the same, there is 
+	 * no NAT */
+	if (strcmp(remote_str,local_str)==0)
+		return 0;
+	/* otherwise ther must be something between AC and WTP */
+	return 1;
+}