2 This file is part of GNUnet.
3 Copyright (C) 2009, 2015, 2016 GNUnet e.V.
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Affero General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
8 or (at your option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Affero General Public License for more details.
16 * This code provides some support for doing STUN transactions. We
17 * receive the simplest possible packet as the STUN server and try
18 * to respond properly.
20 * All STUN packets start with a simple header made of a type,
21 * length (excluding the header) and a 16-byte random transaction id.
22 * Following the header we may have zero or more attributes, each
23 * structured as a type, length and a value (whose format depends
24 * on the type, but often contains addresses).
25 * Of course all fields are in network format.
27 * This code was based on ministun.c.
29 * @file nat/gnunet-service-nat_stun.h
30 * @brief Functions for STUN functionality
31 * @author Bruno Souza Cabral
33 #ifndef GNUNET_SERVICE_NAT_STUN_H
34 #define GNUNET_SERVICE_NAT_STUN_H
39 * Handle an incoming STUN response. Do some basic sanity checks on
40 * packet size and content, try to extract information.
41 * At the moment this only processes BIND requests,
42 * and returns the externally visible address of the original
45 * @param data the packet
46 * @param len the length of the packet in @a data
47 * @param[out] arg sockaddr_in where we will set our discovered address
48 * @return #GNUNET_OK on success,
49 * #GNUNET_NO if the packet is invalid (not a stun packet)
52 GNUNET_NAT_stun_handle_packet_ (const void *data,
54 struct sockaddr_in *arg);