net_ws: allow to set custom IP address, use Q_strncpy instead of Q_strcpy

engine/common/net_ws.c

@@ -1615,15 +1615,15 @@ void NET_GetLocalAddress( void )
 		// If we have changed the ip var from the command line, use that instead.
 		if( Q_strcmp( net_ipname->string, "localhost" ))
 		{
-			Q_strcpy( buff, net_ipname->string );
+			Q_strncpy( buff, net_ipname->string, sizeof( buff ) );
 		}
 		else
 		{
 			pGetHostName( buff, 512 );
-		}
 
 			// ensure that it doesn't overrun the buffer
 			buff[511] = 0;
+		}
 
 		if( NET_StringToAdr( buff, &net_local ))
 		{
@@ -1825,6 +1825,10 @@ void NET_Init( void )
 	if( Sys_GetParmFromCmdLine( "-port", cmd ) && Q_isdigit( cmd ))
 		Cvar_FullSet( "hostport", cmd, FCVAR_READ_ONLY );
 
+	// specify custom ip
+	if( Sys_GetParmFromCmdLine( "-ip", cmd ))
+		Cvar_FullSet( "ip", cmd, FCVAR_READ_ONLY );
+
 	// adjust clockwindow
 	if( Sys_GetParmFromCmdLine( "-clockwindow", cmd ))
 		Cvar_SetValue( "clockwindow", Q_atof( cmd ));