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.
15 You should have received a copy of the GNU Affero General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
19 * This code provides some support for doing STUN transactions. We
20 * receive the simplest possible packet as the STUN server and try
21 * to respond properly.
23 * All STUN packets start with a simple header made of a type,
24 * length (excluding the header) and a 16-byte random transaction id.
25 * Following the header we may have zero or more attributes, each
26 * structured as a type, length and a value (whose format depends
27 * on the type, but often contains addresses).
28 * Of course all fields are in network format.
30 * This code was based on ministun.c.
32 * @file nat/gnunet-service-nat_stun.h
33 * @brief Functions for STUN functionality
34 * @author Bruno Souza Cabral
36 #ifndef GNUNET_SERVICE_NAT_STUN_H
37 #define GNUNET_SERVICE_NAT_STUN_H
42 * Handle an incoming STUN response. Do some basic sanity checks on
43 * packet size and content, try to extract information.
44 * At the moment this only processes BIND requests,
45 * and returns the externally visible address of the original
48 * @param data the packet
49 * @param len the length of the packet in @a data
50 * @param[out] arg sockaddr_in where we will set our discovered address
51 * @return #GNUNET_OK on success,
52 * #GNUNET_NO if the packet is invalid (not a stun packet)
55 GNUNET_NAT_stun_handle_packet_ (const void *data,
57 struct sockaddr_in *arg);