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/*
This file is part of GNUnet.
(C) 2012 Christian Grothoff
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 3, 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
/**
* @file vpn/vpn_api.c
* @brief library to access the VPN service and tell it how to redirect traffic
* @author Christian Grothoff
*/
#include "platform.h"
#include "gnunet_vpn_service.h"
#include "vpn.h"
/**
* Opaque VPN handle
*/
struct GNUNET_VPN_Handle
{
/**
* Configuration we use.
*/
const struct GNUNET_CONFIGURATION_Handle *cfg;
/**
* Connection to VPN service.
*/
struct GNUNET_CLIENT_Connection *client;
/**
* Head of list of active redirection requests.
*/
struct GNUNET_VPN_RedirectionRequest *rr_head;
/**
* Tail of list of active redirection requests.
*/
struct GNUNET_VPN_RedirectionRequest *rr_tail;
};
/**
* Opaque redirection request handle.
*/
struct GNUNET_VPN_RedirectionRequest
{
/**
* Element in DLL.
*/
struct GNUNET_VPN_RedirectionRequest *next;
/**
* Element in DLL.
*/
struct GNUNET_VPN_RedirectionRequest *prev;
/**
* Pointer to the VPN struct.
*/
struct GNUNET_VPN_Handle *vh;
/**
* Target IP address for the redirection, or NULL for
* redirection to service. Allocated after this struct.
*/
const void *addr;
/**
* Function to call with the designated IP address.
*/
GNUNET_VPN_AllocationCallback cb;
/**
* Closure for 'cb'.
*/
void *cb_cls;
/**
* For service redirection, identity of the peer offering the service.
*/
struct GNUNET_PeerIdentity peer;
/**
* For service redirection, service descriptor.
*/
GNUNET_HashCode serv;
/**
* At what time should the created service mapping expire?
*/
struct GNUNET_TIME_Absolute expiration_time;
/**
* Desired address family for the result.
*/
int result_af;
/**
* Address family of 'addr'. AF_INET or AF_INET6.
*/
int addr_af;
/**
* GNUNET_YES if we are to call the callback only after successful
* mesh tunnel creation.
*/
int nac;
/**
* For service redirection, IPPROT_UDP or IPPROTO_TCP.
*/
uint8_t protocol;
};
/**
* Cancel redirection request with the service.
*
* @param rr request to cancel
*/
void
GNUNET_VPN_cancel_request (struct GNUNET_VPN_RedirectionRequest *rr)
{
struct GNUNET_VPN_Handle *vh;
vh = rr->vh;
GNUNET_CONTAINER_DLL_remove (vh->rr_head,
vh->rr_tail,
rr);
GNUNET_free (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 af address family, AF_INET or AF_INET6
* @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 nac GNUNET_YES to notify via callback only after completion of
* the MESH-level connection,
* GNUNET_NO to notify as soon as the IP has been reserved
* @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 *rh,
int af,
uint8_t protocol,
const struct GNUNET_PeerIdentity *peer,
const GNUNET_HashCode *serv,
int nac,
struct GNUNET_TIME_Absolute expiration_time,
GNUNET_VPN_AllocationCallback cb,
void *cb_cls)
{
return NULL; // FIXME
}
/**
* 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
* @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 nac GNUNET_YES to notify via callback only after completion of
* the MESH-level connection,
* GNUNET_NO to notify as soon as the IP has been reserved
* @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 *rh,
int result_af,
int addr_af,
const void *addr,
int nac,
struct GNUNET_TIME_Absolute expiration_time,
GNUNET_VPN_AllocationCallback cb,
void *cb_cls)
{
return NULL; // FIXME
}
/**
* 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)
{
struct GNUNET_VPN_Handle *vh;
vh = GNUNET_malloc (sizeof (struct GNUNET_VPN_Handle));
vh->cfg = cfg;
vh->client = GNUNET_CLIENT_connect ("vpn", cfg);
return vh;
}
/**
* Disconnect from the VPN service.
*
* @param vh VPN handle
*/
void
GNUNET_VPN_disconnect (struct GNUNET_VPN_Handle *vh)
{
GNUNET_assert (NULL == vh->rr_head);
GNUNET_CLIENT_disconnect (vh->client, GNUNET_NO);
GNUNET_free (vh);
}
/* end of vpn_api.c */
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