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/*
* Connection.h
*
* Copyright (C) 2008 Matthias Schiffer <matthias@gamezock.de>
*
* This program 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 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 MAD_NET_CONNECTION_H_
#define MAD_NET_CONNECTION_H_
#include <queue>
#include <gnutls/gnutls.h>
#include <sigc++/signal.h>
#include <poll.h>
#include "Packet.h"
namespace Mad {
namespace Net {
class IPAddress;
class Packet;
class Connection {
private:
struct Transmission {
unsigned long length;
unsigned long transmitted;
unsigned char *data;
sigc::slot<void,const void*,unsigned long> notify;
};
enum State {
DISCONNECTED, HANDSHAKE, CONNECTION_HEADER, PACKET_HEADER, PACKET_DATA, DISCONNECT, BYE
} state;
Transmission transR;
std::queue<Transmission> transS;
Packet::Data header;
sigc::signal<void,Connection*,const Packet&> signal;
bool authenticated;
void doHandshake();
void packetHeaderReceiveHandler(const void *data, unsigned long length);
void packetDataReceiveHandler(const void *data, unsigned long length);
void doReceive();
void doSend();
void doBye();
void doDisconnect();
bool receiveComplete() const {
return (transR.length == transR.transmitted);
}
void bye() {
if(state != DISCONNECT)
return;
state = BYE;
doBye();
}
// Prevent shallow copy
Connection(const Connection &o);
Connection& operator=(const Connection &o);
protected:
struct ConnectionHeader {
unsigned char m;
unsigned char a;
unsigned char d;
unsigned char type;
unsigned char versionMajor;
unsigned char versionMinor;
unsigned char protVerMin;
unsigned char protVerMax;
};
int sock;
gnutls_session_t session;
gnutls_certificate_credentials_t x509_cred;
IPAddress *peer;
void handshake() {
if(isConnected())
return;
state = HANDSHAKE;
doHandshake();
}
virtual void connectionHeader() = 0;
bool rawReceive(unsigned long length, const sigc::slot<void,const void*,unsigned long> ¬ify);
bool rawSend(const unsigned char *data, unsigned long length);
bool enterReceiveLoop() {
if(!isConnected() || isDisconnecting())
return false;
state = PACKET_HEADER;
return rawReceive(sizeof(Packet::Data), sigc::mem_fun(this, &Connection::packetHeaderReceiveHandler));
}
public:
Connection() : state(DISCONNECTED), authenticated(false), peer(0) {
transR.length = transR.transmitted = 0;
transR.data = 0;
gnutls_certificate_allocate_credentials(&x509_cred);
}
virtual ~Connection() {
if(isConnected())
doDisconnect();
if(transR.data)
delete [] transR.data;
while(!sendQueueEmpty()) {
delete [] transS.front().data;
transS.pop();
}
gnutls_certificate_free_credentials(x509_cred);
}
bool isConnected() const {return (state != DISCONNECTED);}
bool isConnecting() const {
return (state == HANDSHAKE || state == CONNECTION_HEADER);
}
bool isDisconnecting() const {
return (state == DISCONNECT || state == BYE);
}
bool isAuthenticated() const {return authenticated;}
void setAuthenticated() {authenticated = true;}
const gnutls_datum_t* getCertificate() {
return gnutls_certificate_get_ours(session);
}
const gnutls_datum_t* getPeerCertificate() {
unsigned int n;
return gnutls_certificate_get_peers(session, &n);
}
const IPAddress* getPeer() {return peer;}
int getSocket() const {return sock;}
void disconnect() {
if(isConnected() && !isDisconnecting()) {
state = DISCONNECT;
if(sendQueueEmpty())
bye();
}
}
struct pollfd getPollfd() const;
bool send(const Packet &packet) {
if(!isConnected() || isConnecting() || isDisconnecting())
return false;
return rawSend(reinterpret_cast<const unsigned char*>(packet.getRawData()), packet.getRawDataLength());
}
void sendReceive(short events = POLLIN|POLLOUT);
bool sendQueueEmpty() const {return transS.empty();}
sigc::signal<void,Connection*,const Packet&> signalReceive() const {return signal;}
static void init() {
gnutls_global_init();
}
static void deinit() {
gnutls_global_deinit();
}
};
}
}
#endif /*MAD_NET_CONNECTION_H_*/
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