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- /*
- This file is part of GNUnet
- Copyright (C) 2012 GNUnet e.V.
- GNUnet is free software: you can redistribute it and/or modify it
- under the terms of the GNU Affero General Public License as published
- by the Free Software Foundation, either version 3 of the License,
- or (at your option) any later version.
- GNUnet is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Affero General Public License for more details.
- You should have received a copy of the GNU Affero General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
- SPDX-License-Identifier: AGPL3.0-or-later
- */
- /**
- * @author Christian Grothoff
- *
- * @file
- * API to access the VPN service.
- *
- * @defgroup vpn VPN service
- *
- * @{
- */
- #ifndef GNUNET_VPN_SERVICE_H
- #define GNUNET_VPN_SERVICE_H
- #include "gnunet_util_lib.h"
- /**
- * Opaque VPN handle
- */
- struct GNUNET_VPN_Handle;
- /**
- * Opaque redirection request handle.
- */
- struct GNUNET_VPN_RedirectionRequest;
- /**
- * Callback invoked from the VPN service once a redirection is
- * available. Provides the IP address that can now be used to
- * reach the requested destination.
- *
- * @param cls closure
- * @param af address family, AF_INET or AF_INET6; AF_UNSPEC on error;
- * will match 'result_af' from the request
- * @param address IP address (struct in_addr or struct in_addr6, depending on 'af')
- * that the VPN allocated for the redirection;
- * traffic to this IP will now be redirected to the
- * specified target peer; NULL on error
- */
- typedef void (*GNUNET_VPN_AllocationCallback)(void *cls,
- int af,
- const void *address);
- /**
- * Cancel redirection request with the service.
- *
- * @param rr request to cancel
- */
- void
- GNUNET_VPN_cancel_request (struct GNUNET_VPN_RedirectionRequest *rr);
- /**
- * Tell the VPN that a forwarding to a particular peer offering a
- * particular service is requested. The VPN is to reserve a
- * particular IP for the redirection and return it. The VPN will
- * begin the redirection as soon as possible and maintain it as long
- * as it is actively used and keeping it is feasible. Given resource
- * limitations, the longest inactive mappings will be destroyed.
- *
- * @param vh VPN handle
- * @param result_af desired address family for the returned allocation
- * can also be AF_UNSPEC
- * @param protocol protocol, IPPROTO_UDP or IPPROTO_TCP
- * @param peer target peer for the redirection
- * @param serv service descriptor to give to the peer
- * @param expiration_time at what time should the redirection expire?
- * (this should not impact connections that are active at that time)
- * @param cb function to call with the IP
- * @param cb_cls closure for cb
- * @return handle to cancel the request (means the callback won't be
- * invoked anymore; the mapping may or may not be established
- * anyway)
- */
- struct GNUNET_VPN_RedirectionRequest *
- GNUNET_VPN_redirect_to_peer (struct GNUNET_VPN_Handle *vh,
- int result_af,
- uint8_t protocol,
- const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_HashCode *serv,
- struct GNUNET_TIME_Absolute expiration_time,
- GNUNET_VPN_AllocationCallback cb,
- void *cb_cls);
- /**
- * Tell the VPN that forwarding to the Internet via some exit node is
- * requested. Note that both UDP and TCP traffic will be forwarded,
- * but possibly to different exit nodes. The VPN is to reserve a
- * particular IP for the redirection and return it. The VPN will
- * begin the redirection as soon as possible and maintain it as long
- * as it is actively used and keeping it is feasible. Given resource
- * limitations, the longest inactive mappings will be destroyed.
- *
- * @param vh VPN handle
- * @param result_af desired address family for the returned allocation,
- * can also be AF_UNSPEC
- * @param addr_af address family for 'addr', AF_INET or AF_INET6
- * @param addr destination IP address on the Internet; destination
- * port is to be taken from the VPN packet itself
- * @param expiration_time at what time should the redirection expire?
- * (this should not impact connections that are active at that time)
- * @param cb function to call with the IP
- * @param cb_cls closure for cb
- * @return handle to cancel the request (means the callback won't be
- * invoked anymore; the mapping may or may not be established
- * anyway)
- */
- struct GNUNET_VPN_RedirectionRequest *
- GNUNET_VPN_redirect_to_ip (struct GNUNET_VPN_Handle *vh,
- int result_af,
- int addr_af,
- const void *addr,
- struct GNUNET_TIME_Absolute expiration_time,
- GNUNET_VPN_AllocationCallback cb,
- void *cb_cls);
- /**
- * Connect to the VPN service
- *
- * @param cfg configuration to use
- * @return VPN handle
- */
- struct GNUNET_VPN_Handle *
- GNUNET_VPN_connect (const struct GNUNET_CONFIGURATION_Handle *cfg);
- /**
- * Disconnect from the VPN service.
- *
- * @param vh VPN handle
- */
- void
- GNUNET_VPN_disconnect (struct GNUNET_VPN_Handle *vh);
- #endif
- /** @} */ /* end of group */
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