make outbound port configurable on runtime

llarp/router/router.cpp

@@ -734,7 +734,11 @@ namespace llarp
 
     if(StrEq(section, "bind"))
     {
-      if(!StrEq(key, "*"))
+      if(StrEq(key, "*"))
+      {
+        m_OutboundPort = proto;
+      }
+      else
       {
         auto server = llarp::utp::NewServerFromRouter(this);
         if(!server->EnsureKeys(transport_keyfile.string().c_str()))
@@ -1676,7 +1680,7 @@ namespace llarp
 
       for(auto af : afs)
       {
-        if(!link->Configure(netloop, "*", af, 0))
+        if(!link->Configure(netloop, "*", af, m_OutboundPort))
           continue;
         outboundLinks.insert(std::move(link));
         break;

llarp/router/router.hpp

@@ -209,6 +209,8 @@ namespace llarp
     // buffer for serializing link messages
     std::array< byte_t, MAX_LINK_MSG_SIZE > linkmsg_buffer;
 
+    uint16_t m_OutboundPort = 0;
+
     /// always maintain this many connections to other routers
     size_t minConnectedRouters = 1;
     /// hard upperbound limit on the number of router to router connections