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/* <!-- copyright */
/*
* aria2 - a simple utility for downloading files faster
*
* Copyright (C) 2006 Tatsuhiro Tsujikawa
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* copyright --> */
#ifndef _D_SOCKET_CORE_H_
#define _D_SOCKET_CORE_H_
#include <string>
#include <utility>
#include "common.h"
#ifdef HAVE_LIBSSL
// for SSL
# include <openssl/ssl.h>
#endif // HAVE_LIBSSL
#ifdef HAVE_LIBGNUTLS
# include <gnutls/gnutls.h>
#endif // HAVE_LIBGNUTLS
using namespace std;
class SocketCore {
friend class Socket;
private:
// socket endpoint descriptor
int sockfd;
// reference counter for this object.
int use;
bool secure;
#ifdef HAVE_LIBSSL
// for SSL
SSL_CTX* sslCtx;
SSL* ssl;
#endif // HAVE_LIBSSL
#ifdef HAVE_LIBGNUTLS
gnutls_session_t sslSession;
gnutls_certificate_credentials_t sslXcred;
char* peekBuf;
int peekBufLength;
int peekBufMax;
int shiftPeekData(char* data, int len);
void addPeekData(char* data, int len);
int gnutlsRecv(char* data, int len);
int gnutlsPeek(char* data, int len);
#endif // HAVE_LIBGNUTLS
void init();
SocketCore(int sockfd);
public:
SocketCore();
~SocketCore();
/**
* Creates a socket and listens form connection on it.
* @param port port to listen. If 0 is specified, os automaticaly
* choose avaiable port.
*/
void beginListen(int port = 0);
/**
* Stores host address and port of this socket to addrinfo.
* @param addrinfo placeholder to store host address and port.
*/
void getAddrInfo(pair<string, int>& addrinfo) const;
/**
* Stores peer's address and port to peerinfo.
* @param peerinfo placeholder to store peer's address and port.
*/
void getPeerInfo(pair<string, int>& peerinfo) const;
/**
* Accepts incoming connection on this socket.
* You must call beginListen() before calling this method.
* @return accepted socket. The caller must delete it after using it.
*/
SocketCore* acceptConnection() const;
/**
* Connects to the server named host and the destination port is port.
* This method makes socket non-blocking mode.
* To make the socket blocking mode again, call setBlockingMode() after
* the connection is established.
* @param host hostname or ip address to connect to
* @param port service port number to connect to
*/
void establishConnection(string host, int port);
/**
* Makes this socket blocking mode.
*/
void setBlockingMode() const;
/**
* Closes the connection of this socket.
*/
void closeConnection();
/**
* Checks whether this socket is available for writing.
* @param timeout the amount of time elapsed before the checking are timed
* out.
* @return true if the socket is available for writing,
* otherwise returns false.
*/
bool isWritable(int timeout) const;
/**
* Checks whether this socket is available for reading.
* @param timeout the amount of time elapsed before the checking are timed
* out.
* @return true if the socket is available for reading,
* otherwise returns false.
*/
bool isReadable(int timeout) const;
/**
* Writes characters into this socket. data is a pointer pointing the first
* byte of the data and len is the length of data.
* This method internally calls isWritable(). The parmeter timeout is used
* for this method call.
* @param data data to write
* @param len length of data
* @param timeout the amount of time elapsed before isWritable()
* are timed out.
*/
void writeData(const char* data, int len, int timeout = 0);
/**
* Reads up to len bytes from this socket.
* data is a pointer pointing the first
* byte of the data, which must be allocated before this method is called.
* len is the size of the allocated memory. When this method returns
* successfully, len is replaced by the size of the read data.
* This method internally calls isReadable(). The parameter timeout is used
* for this method call.
* @param data holder to store data.
* @param len the maximum size data can store. This method assigns
* the number of bytes read to len.
* @param timeout the amount of time elapsed before isReadable() are timed
* out.
*/
void readData(char* data, int& len, int timeout = 0);
/**
* Reads up to len bytes from this socket, but bytes are not removed from
* this socket.
* This method internally calls isReadable(). The parameter timeout is used
* for this method call.
* @param data holder to store data.
* @param len the maximum size data can store. This method assigns
* the number of bytes read to len.
* @param timeout the amount of time elapsed before isReadable() are timed
* out.
*/
void peekData(char* data, int& len, int timeout = 0);
/**
* Makes this socket secure.
* If the system has not OpenSSL, then this method do nothing.
* connection must be established before calling this method.
*/
void initiateSecureConnection() ;
};
#endif // _D_SOCKET_CORE_H_
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