2 This file is part of GNUnet.
3 Copyright (C) 2009, 2010, 2011, 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/>.
18 SPDX-License-Identifier: AGPL3.0-or-later
22 * @file nat/gnunet-service-nat_helper.h
23 * @brief runs the gnunet-helper-nat-server
24 * @author Milan Bouchet-Valat
25 * @author Christian Grothoff
28 #include "gnunet_util_lib.h"
32 * Information we keep per NAT helper process.
38 * Function called whenever we get a connection reversal
39 * request from another peer.
42 * @param ra IP address of the peer who wants us to connect to it
45 (*GN_ReversalCallback) (void *cls,
46 const struct sockaddr_in *ra);
50 * Start the gnunet-helper-nat-server and process incoming
53 * @param internal_address
54 * @param cb function to call if we receive a request
55 * @param cb_cls closure for @a cb
56 * @param cfg handle to the GNUnet configuration
57 * @return NULL on error
59 struct HelperContext *
60 GN_start_gnunet_nat_server_ (const struct in_addr *internal_address,
61 GN_ReversalCallback cb,
63 const struct GNUNET_CONFIGURATION_Handle *cfg);
67 * Start the gnunet-helper-nat-server and process incoming
70 * @param h helper context to stop
73 GN_stop_gnunet_nat_server_ (struct HelperContext *h);
77 * We want to connect to a peer that is behind NAT. Run the
78 * gnunet-helper-nat-client to send dummy ICMP responses to cause
79 * that peer to connect to us (connection reversal).
81 * @param internal_address out internal address to use
82 * @param internal_port internal port to use
83 * @param remote_v4 the address of the peer (IPv4-only)
84 * @param cfg handle to the GNUnet configuration
85 * @return #GNUNET_SYSERR on error,
86 * #GNUNET_OK otherwise
89 GN_request_connection_reversal (const struct in_addr *internal_address,
90 uint16_t internal_port,
91 const struct in_addr *remote_v4,
92 const struct GNUNET_CONFIGURATION_Handle *cfg);
95 /* end of gnunet-service-nat_helper.h */