mod_s2s/s2sout.lib: Only attempt to create an IPv6 socket if LuaSocket supports IPv6

diff --git a/plugins/mod_s2s/s2sout.lib.lua b/plugins/mod_s2s/s2sout.lib.lua
index cb2f8be4f8e791cc7c10ba3dbcd0ce04c885dc22..9e26dbee33ebd556f69f778391dcec67bddd38f9 100644 (file)
--- a/plugins/mod_s2s/s2sout.lib.lua
+++ b/plugins/mod_s2s/s2sout.lib.lua
@@ -276,10 +276,13 @@ function s2sout.make_connect(host_session, connect_host, connect_port)
        host_session.secure = nil;
 
        local conn, handler;
-       if connect_host.proto == "IPv4" then
+       local proto = connect_host.proto;
+       if proto == "IPv4" then
                conn, handler = socket.tcp();
-       else
+       elseif proto == "IPv6" and socket.tcp6 then
                conn, handler = socket.tcp6();
+       else
+               handler = "Unsupported protocol: "..tostring(proto);
        end
        
        if not conn then