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/* vim: set expandtab ts=4 sw=4: */
/*
* You may redistribute this program and/or modify it under the terms of
* the GNU General Public License as published by the Free Software Foundation,
* either version 3 of the License, or (at your option) any later version.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef IpTunnel_H
#define IpTunnel_H
#include "admin/Admin.h"
#include "crypto/Random.h"
#include "interface/Interface.h"
#include "memory/Allocator.h"
#include "util/log/Log.h"
#include "util/events/EventBase.h"
#include <stdint.h>
/** This header shall be on all messages sent in and out of the nodeInterface. */
struct IpTunnel_PacketInfoHeader
{
/**
* When the IpTunnel sends a message out the nodeInterface, this is the Ip6 of the node
* which the message should be sent to. When the IpTunnel receives a message from the
* nodeInterface this is the address of the node from which it came.
*/
uint8_t nodeIp6Addr[16];
/** The full 32 byte key which corrisponds to the above Ip6 address. */
uint8_t nodeKey[32];
};
#define IpTunnel_PacketInfoHeader_SIZE 48
Assert_compileTime(sizeof(struct IpTunnel_PacketInfoHeader) == IpTunnel_PacketInfoHeader_SIZE);
struct IpTunnel_Connection
{
/** The header which is used for this connection. */
struct IpTunnel_PacketInfoHeader header;
/** The IPv6 address used for this connection or all zeros if none was assigned. */
uint8_t connectionIp6[16];
/** The IPv4 address used for this connection or all zeros if none was assigned. */
uint8_t connectionIp4[4];
/** non-zero if the connection was made using IpTunnel_connectTo(). */
int isOutgoing : 1;
/** The number of the connection so it can be identified when removing. */
int number : 31;
};
struct IpTunnel
{
/** The interface used to send and receive messages to the TUN device. */
struct Interface tunInterface;
/**
* The interface used to send and receive messages to other nodes.
* All messages sent on this interface shall be preceeded with the IpTunnel_PacketInfoHeader.
*/
struct Interface nodeInterface;
/**
* The list of registered connections, do not modify manually.
* Will be reorganized from time to time so pointers are ephimeral.
*/
struct {
uint32_t count;
struct IpTunnel_Connection* connections;
} connectionList;
};
/**
* Create a new IpTunnel structure.
*
* @param logger a logger or NULL.
* @param eventBase the event base.
* @param alloc an allocator.
*/
struct IpTunnel* IpTunnel_new(struct Log* logger,
struct EventBase* eventBase,
struct Allocator* alloc,
struct Random* rand,
struct Admin* admin);
/**
* Allow another node to tunnel IPv4 and/or ICANN IPv6 through this node.
*
* @param publicKeyOfAuthorizedNode the key for the node which will be allowed to connect.
* @param ip6Address the IPv6 address which the node will be issued or NULL.
* @param ip4Address the IPv4 address which the node will be issued or NULL.
* @param tunnel the IpTunnel.
* @return an connection number which is usable with IpTunnel_remove().
*/
int IpTunnel_allowConnection(uint8_t publicKeyOfAuthorizedNode[32],
uint8_t ip6Address[16],
uint8_t ip4Address[4],
struct IpTunnel* tunnel);
/**
* Connect to another node and get IPv4 and/or IPv6 addresses from it.
*
* @param publicKeyOfNodeToConnectTo the key for the node to connect to.
* @param tunnel the IpTunnel.
* @return an connection number which is usable with IpTunnel_remove().
*/
int IpTunnel_connectTo(uint8_t publicKeyOfNodeToConnectTo[32], struct IpTunnel* tunnel);
/**
* Disconnect from a node or remove authorization to connect.
*
* @param connectionNumber the number of the connection to remove.
* @param tunnel the IpTunnel.
* @return 0 if the connection was successfully removed
* IpTunnel_remove_NOT_FOUND if the connection was not found.
*/
#define IpTunnel_removeConnection_NOT_FOUND -1
int IpTunnel_removeConnection(int connectionNumber, struct IpTunnel* tunnel);
#endif
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