path: root/src/Sockets/TcpSocket.cpp

/** \file TcpSocket.cpp
 **	\date  2004-02-13
 **	\author grymse@alhem.net
**/
/*
Copyright (C) 2004-2007  Anders Hedstrom

This library is made available under the terms of the GNU GPL.

If you would like to use this library in a closed-source application,
a separate license agreement is available. For information about 
the closed-source license agreement for the C++ sockets library,
please visit http://www.alhem.net/Sockets/license.html and/or
email license@alhem.net.

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.
*/
#ifdef _WIN32
#ifdef _MSC_VER
#pragma warning(disable:4786)
#endif
#include <stdlib.h>
#else
#include <errno.h>
#endif
#include "ISocketHandler.h"
#include <fcntl.h>
#include <assert.h>
#include <stdarg.h>
#ifdef HAVE_OPENSSL
#include <openssl/rand.h>
#include <openssl/err.h>
#endif

#include "TcpSocket.h"
#include "Utility.h"
#include "Ipv4Address.h"
#include "Ipv6Address.h"
#include "Mutex.h"
#include "IFile.h"

#ifdef SOCKETS_NAMESPACE
namespace SOCKETS_NAMESPACE {
#endif


#ifdef _DEBUG
#define DEB(x) x
#else
#define DEB(x) 
#endif


// statics
#ifdef HAVE_OPENSSL
SSLInitializer TcpSocket::m_ssl_init;
#endif


// thanks, q
#ifdef _MSC_VER
#pragma warning(disable:4355)
#endif
TcpSocket::TcpSocket(ISocketHandler& h) : StreamSocket(h)
,ibuf(TCP_BUFSIZE_READ)
,m_b_input_buffer_disabled(false)
,m_bytes_sent(0)
,m_bytes_received(0)
,m_skip_c(false)
#ifdef SOCKETS_DYNAMIC_TEMP
,m_buf(new char[TCP_BUFSIZE_READ + 1])
#endif
,m_obuf_top(NULL)
,m_transfer_limit(0)
,m_output_length(0)
#ifdef HAVE_OPENSSL
,m_ssl_ctx(NULL)
,m_ssl(NULL)
,m_sbio(NULL)
#endif
#ifdef ENABLE_SOCKS4
,m_socks4_state(0)
#endif
#ifdef ENABLE_RESOLVER
,m_resolver_id(0)
#endif
#ifdef ENABLE_RECONNECT
,m_b_reconnect(false)
,m_b_is_reconnect(false)
#endif
{
}
#ifdef _MSC_VER
#pragma warning(default:4355)
#endif


#ifdef _MSC_VER
#pragma warning(disable:4355)
#endif
TcpSocket::TcpSocket(ISocketHandler& h,size_t isize,size_t osize) : StreamSocket(h)
,ibuf(isize)
,m_b_input_buffer_disabled(false)
,m_bytes_sent(0)
,m_bytes_received(0)
,m_skip_c(false)
#ifdef SOCKETS_DYNAMIC_TEMP
,m_buf(new char[TCP_BUFSIZE_READ + 1])
#endif
,m_obuf_top(NULL)
,m_transfer_limit(0)
,m_output_length(0)
#ifdef HAVE_OPENSSL
,m_ssl_ctx(NULL)
,m_ssl(NULL)
,m_sbio(NULL)
#endif
#ifdef ENABLE_SOCKS4
,m_socks4_state(0)
#endif
#ifdef ENABLE_RESOLVER
,m_resolver_id(0)
#endif
#ifdef ENABLE_RECONNECT
,m_b_reconnect(false)
,m_b_is_reconnect(false)
#endif
{
}
#ifdef _MSC_VER
#pragma warning(default:4355)
#endif


TcpSocket::~TcpSocket()
{
#ifdef SOCKETS_DYNAMIC_TEMP
	delete[] m_buf;
#endif
	// %! empty m_obuf
#ifdef HAVE_OPENSSL
	if (m_ssl)
	{
		SSL_free(m_ssl);
	}
#endif
}


bool TcpSocket::Open(ipaddr_t ip,port_t port,bool skip_socks)
{
	Ipv4Address ad(ip, port);
	Ipv4Address local;
	return Open(ad, local, skip_socks);
}


#ifdef ENABLE_IPV6
#ifdef IPPROTO_IPV6
bool TcpSocket::Open(in6_addr ip,port_t port,bool skip_socks)
{
	Ipv6Address ad(ip, port);
	return Open(ad, skip_socks);
}
#endif
#endif


bool TcpSocket::Open(SocketAddress& ad,bool skip_socks)
{
	Ipv4Address bind_ad("0.0.0.0", 0);
	return Open(ad, bind_ad, skip_socks);
}


bool TcpSocket::Open(SocketAddress& ad,SocketAddress& bind_ad,bool skip_socks)
{
	if (!ad.IsValid())
	{
		Handler().LogError(this, "Open", 0, "Invalid SocketAddress", LOG_LEVEL_FATAL);
		SetCloseAndDelete();
		return false;
	}
	if (Handler().GetCount() >= FD_SETSIZE)
	{
		Handler().LogError(this, "Open", 0, "no space left in fd_set", LOG_LEVEL_FATAL);
		SetCloseAndDelete();
		return false;
	}
	SetConnecting(false);
#ifdef ENABLE_SOCKS4
	SetSocks4(false);
#endif
	// check for pooling
#ifdef ENABLE_POOL
	if (Handler().PoolEnabled())
	{
		ISocketHandler::PoolSocket *pools = Handler().FindConnection(SOCK_STREAM, "tcp", ad);
		if (pools)
		{
			CopyConnection( pools );
			delete pools;

			SetIsClient();
			SetCallOnConnect(); // ISocketHandler must call OnConnect
			Handler().LogError(this, "SetCallOnConnect", 0, "Found pooled connection", LOG_LEVEL_INFO);
			return true;
		}
	}
#endif
	// if not, create new connection
	SOCKET s = CreateSocket(ad.GetFamily(), SOCK_STREAM, "tcp");
	if (s == INVALID_SOCKET)
	{
		return false;
	}
	// socket must be nonblocking for async connect
	if (!SetNonblocking(true, s))
	{
		SetCloseAndDelete();
		closesocket(s);
		return false;
	}
#ifdef ENABLE_POOL
	SetIsClient(); // client because we connect
#endif
	SetClientRemoteAddress(ad);
	int n = 0;
	if (bind_ad.GetPort() != 0)
	{
		bind(s, bind_ad, bind_ad);
	}
#ifdef ENABLE_SOCKS4
	if (!skip_socks && GetSocks4Host() && GetSocks4Port())
	{
		Ipv4Address sa(GetSocks4Host(), GetSocks4Port());
		{
			std::string sockshost;
			Utility::l2ip(GetSocks4Host(), sockshost);
			Handler().LogError(this, "Open", 0, "Connecting to socks4 server @ " + sockshost + ":" +
				Utility::l2string(GetSocks4Port()), LOG_LEVEL_INFO);
		}
		SetSocks4();
		n = connect(s, sa, sa);
		SetRemoteAddress(sa);
	}
	else
#endif
	{
		n = connect(s, ad, ad);
		SetRemoteAddress(ad);
	}
	if (n == -1)
	{
		// check error code that means a connect is in progress
#ifdef _WIN32
		if (Errno == WSAEWOULDBLOCK)
#else
		if (Errno == EINPROGRESS)
#endif
		{
			Attach(s);
			SetConnecting( true ); // this flag will control fd_set's
		}
		else
#ifdef ENABLE_SOCKS4
		if (Socks4() && Handler().Socks4TryDirect() ) // retry
		{
			closesocket(s);
			return Open(ad, true);
		}
		else
#endif
#ifdef ENABLE_RECONNECT
		if (Reconnect())
		{
			Handler().LogError(this, "connect: failed, reconnect pending", Errno, StrError(Errno), LOG_LEVEL_INFO);
			Attach(s);
			SetConnecting( true ); // this flag will control fd_set's
		}
		else
#endif
		{
			Handler().LogError(this, "connect: failed", Errno, StrError(Errno), LOG_LEVEL_FATAL);
			SetCloseAndDelete();
			closesocket(s);
			return false;
		}
	}
	else
	{
		Attach(s);
		SetCallOnConnect(); // ISocketHandler must call OnConnect
	}

	// 'true' means connected or connecting(not yet connected)
	// 'false' means something failed
	return true; //!Connecting();
}


bool TcpSocket::Open(const std::string &host,port_t port)
{
#ifdef ENABLE_IPV6
#ifdef IPPROTO_IPV6
	if (IsIpv6())
	{
#ifdef ENABLE_RESOLVER
		if (!Handler().ResolverEnabled() || Utility::isipv6(host) )
		{
#endif
			in6_addr a;
			if (!Utility::u2ip(host, a))
			{
				SetCloseAndDelete();
				return false;
			}
			Ipv6Address ad(a, port);
			Ipv6Address local;
			return Open(ad, local);
#ifdef ENABLE_RESOLVER
		}
		m_resolver_id = Resolve6(host, port);
		return true;
#endif
	}
#endif
#endif
#ifdef ENABLE_RESOLVER
	if (!Handler().ResolverEnabled() || Utility::isipv4(host) )
	{
#endif
		ipaddr_t l;
		if (!Utility::u2ip(host,l))
		{
			SetCloseAndDelete();
			return false;
		}
		Ipv4Address ad(l, port);
		Ipv4Address local;
		return Open(ad, local);
#ifdef ENABLE_RESOLVER
	}
	// resolve using async resolver thread
	m_resolver_id = Resolve(host, port);
	return true;
#endif
}


#ifdef ENABLE_RESOLVER
void TcpSocket::OnResolved(int id,ipaddr_t a,port_t port)
{
DEB(	fprintf(stderr, "TcpSocket::OnResolved id %d addr %x port %d\n", id, a, port);)
	if (id == m_resolver_id)
	{
		if (a && port)
		{
			Ipv4Address ad(a, port);
			Ipv4Address local;
			if (Open(ad, local))
			{
				if (!Handler().Valid(this))
				{
					Handler().Add(this);
				}
			}
		}
		else
		{
			Handler().LogError(this, "OnResolved", 0, "Resolver failed", LOG_LEVEL_FATAL);
			SetCloseAndDelete();
		}
	}
	else
	{
		Handler().LogError(this, "OnResolved", id, "Resolver returned wrong job id", LOG_LEVEL_FATAL);
		SetCloseAndDelete();
	}
}


#ifdef ENABLE_IPV6
void TcpSocket::OnResolved(int id,in6_addr& a,port_t port)
{
	if (id == m_resolver_id)
	{
		Ipv6Address ad(a, port);
		if (ad.IsValid())
		{
			Ipv6Address local;
			if (Open(ad, local))
			{
				if (!Handler().Valid(this))
				{
					Handler().Add(this);
				}
			}
		}
	}
	else
	{
		Handler().LogError(this, "OnResolved", id, "Resolver returned wrong job id", LOG_LEVEL_FATAL);
		SetCloseAndDelete();
	}
}
#endif
#endif


void TcpSocket::OnRead()
{
	int n = 0;
#ifdef SOCKETS_DYNAMIC_TEMP
	char *buf = m_buf;
#else
	char buf[TCP_BUFSIZE_READ];
#endif
#ifdef HAVE_OPENSSL
	if (IsSSL())
	{
		if (!Ready())
			return;
		n = SSL_read(m_ssl, buf, TCP_BUFSIZE_READ);
		if (n == -1)
		{
			n = SSL_get_error(m_ssl, n);
			switch (n)
			{
			case SSL_ERROR_NONE:
			case SSL_ERROR_WANT_READ:
			case SSL_ERROR_WANT_WRITE:
				break;
			case SSL_ERROR_ZERO_RETURN:
DEB(				fprintf(stderr, "SSL_read() returns zero - closing socket\n");)
				OnDisconnect();
				SetCloseAndDelete(true);
				SetFlushBeforeClose(false);
#ifdef ENABLE_POOL
				SetLost();
#endif
				break;
			default:
DEB(				fprintf(stderr, "SSL read problem, errcode = %d\n",n);)
				OnDisconnect();
				SetCloseAndDelete(true);
				SetFlushBeforeClose(false);
#ifdef ENABLE_POOL
				SetLost();
#endif
			}
			return;
		}
		else
		if (!n)
		{
			OnDisconnect();
			SetCloseAndDelete(true);
			SetFlushBeforeClose(false);
#ifdef ENABLE_POOL
			SetLost();
#endif
			SetShutdown(SHUT_WR);
			return;
		}
		else
		if (n > 0 && n <= TCP_BUFSIZE_READ)
		{
			m_bytes_received += n;
			if (GetTrafficMonitor())
			{
				GetTrafficMonitor() -> fwrite(buf, 1, n);
			}
			if (!m_b_input_buffer_disabled && !ibuf.Write(buf,n))
			{
				Handler().LogError(this, "OnRead(ssl)", 0, "ibuf overflow", LOG_LEVEL_WARNING);
			}
		}
		else
		{
			Handler().LogError(this, "OnRead(ssl)", n, "abnormal value from SSL_read", LOG_LEVEL_ERROR);
		}
	}
	else
#endif // HAVE_OPENSSL
	{
		n = recv(GetSocket(), buf, TCP_BUFSIZE_READ, MSG_NOSIGNAL);
		if (n == -1)
		{
			Handler().LogError(this, "read", Errno, StrError(Errno), LOG_LEVEL_FATAL);
			OnDisconnect();
			SetCloseAndDelete(true);
			SetFlushBeforeClose(false);
#ifdef ENABLE_POOL
			SetLost();
#endif
			return;
		}
		else
		if (!n)
		{
			OnDisconnect();
			SetCloseAndDelete(true);
			SetFlushBeforeClose(false);
#ifdef ENABLE_POOL
			SetLost();
#endif
			SetShutdown(SHUT_WR);
			return;
		}
		else
		if (n > 0 && n <= TCP_BUFSIZE_READ)
		{
			m_bytes_received += n;
			if (GetTrafficMonitor())
			{
				GetTrafficMonitor() -> fwrite(buf, 1, n);
			}
			if (!m_b_input_buffer_disabled && !ibuf.Write(buf,n))
			{
				Handler().LogError(this, "OnRead", 0, "ibuf overflow", LOG_LEVEL_WARNING);
			}
		}
		else
		{
			Handler().LogError(this, "OnRead", n, "abnormal value from recv", LOG_LEVEL_ERROR);
		}
	}
	//
	OnRead( buf, n );
}


void TcpSocket::OnRead( char *buf, size_t n )
{
	// unbuffered
	if (n > 0 && n <= TCP_BUFSIZE_READ)
	{
		if (LineProtocol())
		{
			buf[n] = 0;
			size_t i = 0;
			if (m_skip_c && (buf[i] == 13 || buf[i] == 10) && buf[i] != m_c)
			{
				m_skip_c = false;
				i++;
			}
			size_t x = i;
			for (; i < n && LineProtocol(); i++)
			{
				while ((buf[i] == 13 || buf[i] == 10) && LineProtocol())
				{
					char c = buf[i];
					buf[i] = 0;
					if (buf[x])
					{
						m_line += (buf + x);
					}
					OnLine( m_line );
					i++;
					m_skip_c = true;
					m_c = c;
					if (i < n && (buf[i] == 13 || buf[i] == 10) && buf[i] != c)
					{
						m_skip_c = false;
						i++;
					}
					x = i;
					m_line = "";
				}
				if (!LineProtocol())
				{
					break;
				}
			}
			if (!LineProtocol())
			{
				if (i < n)
				{
					OnRawData(buf + i, n - i);
				}
			}
			else
			if (buf[x])
			{
				m_line += (buf + x);
			}
		}
		else
		{
			OnRawData(buf, n);
		}
	}
	if (m_b_input_buffer_disabled)
	{
		return;
	}
	// further processing: socks4
#ifdef ENABLE_SOCKS4
	if (Socks4())
	{
		bool need_more = false;
		while (GetInputLength() && !need_more && !CloseAndDelete())
		{
			need_more = OnSocks4Read();
		}
	}
#endif
}


void TcpSocket::OnWriteComplete()
{
}


void TcpSocket::OnWrite()
{
	if (Connecting())
	{
		int err = SoError();

		// don't reset connecting flag on error here, we want the OnConnectFailed timeout later on
		if (!err) // ok
		{
			Set(!IsDisableRead(), false);
			SetConnecting(false);
			SetCallOnConnect();
			return;
		}
		Handler().LogError(this, "tcp: connect failed", err, StrError(err), LOG_LEVEL_FATAL);
		Set(false, false); // no more monitoring because connection failed

		// failed
#ifdef ENABLE_SOCKS4
		if (Socks4())
		{
			// %! leave 'Connecting' flag set?
			OnSocks4ConnectFailed();
			return;
		}
#endif
		if (GetConnectionRetry() == -1 ||
			(GetConnectionRetry() && GetConnectionRetries() < GetConnectionRetry()) )
		{
			// even though the connection failed at once, only retry after
			// the connection timeout.
			// should we even try to connect again, when CheckConnect returns
			// false it's because of a connection error - not a timeout...
			return;
		}
		SetConnecting(false);
		SetCloseAndDelete( true );
		/// \todo state reason why connect failed
		OnConnectFailed();
		return;
	}
	// try send next block in buffer
	// if full block is sent, repeat
	// if all blocks are sent, reset m_wfds

	bool repeat = false;
	size_t sz = m_transfer_limit ? GetOutputLength() : 0;
	do
	{
		output_l::iterator it = m_obuf.begin();
		OUTPUT *p = *it;
		repeat = false;
		int n = TryWrite(p -> Buf(), p -> Len());
		if (n > 0)
		{
			size_t left = p -> Remove(n);
			m_output_length -= n;
			if (!left)
			{
				delete p;
				m_obuf.erase(it);
				if (!m_obuf.size())
				{
					m_obuf_top = NULL;
					OnWriteComplete();
				}
				else
				{
					repeat = true;
				}
			}
		}
	} while (repeat);

	if (m_transfer_limit && sz > m_transfer_limit && GetOutputLength() < m_transfer_limit)
	{
		OnTransferLimit();
	}

	// check output buffer set, set/reset m_wfds accordingly
	{
		bool br;
		bool bw;
		bool bx;
		Handler().Get(GetSocket(), br, bw, bx);
		if (m_obuf.size())
			Set(br, true);
		else
			Set(br, false);
	}
}


int TcpSocket::TryWrite(const char *buf, size_t len)
{
	int n = 0;
#ifdef HAVE_OPENSSL
	if (IsSSL())
	{
		n = SSL_write(m_ssl, buf, (int)len);
		if (n == -1)
		{
			int errnr = SSL_get_error(m_ssl, n);
			if ( errnr != SSL_ERROR_WANT_READ && errnr != SSL_ERROR_WANT_WRITE )
			{
				OnDisconnect();
				SetCloseAndDelete(true);
				SetFlushBeforeClose(false);
#ifdef ENABLE_POOL
				SetLost();
#endif
				const char *errbuf = ERR_error_string(errnr, NULL);
				Handler().LogError(this, "OnWrite/SSL_write", errnr, errbuf, LOG_LEVEL_FATAL);
			}
			return 0;
		}
		else
		if (!n)
		{
			OnDisconnect();
			SetCloseAndDelete(true);
			SetFlushBeforeClose(false);
#ifdef ENABLE_POOL
			SetLost();
#endif
DEB(			int errnr = SSL_get_error(m_ssl, n);
			const char *errbuf = ERR_error_string(errnr, NULL);
			fprintf(stderr, "SSL_write() returns 0: %d : %s\n",errnr, errbuf);)
		}
	}
	else
#endif // HAVE_OPENSSL
	{
		n = send(GetSocket(), buf, (int)len, MSG_NOSIGNAL);
		if (n == -1)
		{
		// normal error codes:
		// WSAEWOULDBLOCK
		//       EAGAIN or EWOULDBLOCK
#ifdef _WIN32
			if (Errno != WSAEWOULDBLOCK)
#else
			if (Errno != EWOULDBLOCK)
#endif
			{	
				Handler().LogError(this, "send", Errno, StrError(Errno), LOG_LEVEL_FATAL);
				OnDisconnect();
				SetCloseAndDelete(true);
				SetFlushBeforeClose(false);
#ifdef ENABLE_POOL
				SetLost();
#endif
			}
			return 0;
		}
	}
	if (n > 0)
	{
		m_bytes_sent += n;
		if (GetTrafficMonitor())
		{
			GetTrafficMonitor() -> fwrite(buf, 1, n);
		}
	}
	return n;
}


void TcpSocket::Buffer(const char *buf, size_t len)
{
	size_t ptr = 0;
	m_output_length += len;
	while (ptr < len)
	{
		// buf/len => pbuf/sz
		size_t space = 0;
		if (m_obuf_top && (space = m_obuf_top -> Space()) > 0)
		{
			const char *pbuf = buf + ptr;
			size_t sz = len - ptr;
			if (space >= sz)
			{
				m_obuf_top -> Add(pbuf, sz);
				ptr += sz;
			}
			else
			{
				m_obuf_top -> Add(pbuf, space);
				ptr += space;
			}
		}
		else
		{
			m_obuf_top = new OUTPUT;
			m_obuf.push_back( m_obuf_top );
		}
	}
}


void TcpSocket::Send(const std::string &str,int i)
{
	SendBuf(str.c_str(),str.size(),i);
}


void TcpSocket::SendBuf(const char *buf,size_t len,int)
{
	if (!Ready() && !Connecting())
	{
		Handler().LogError(this, "SendBuf", -1, "Attempt to write to a non-ready socket" ); // warning
		if (GetSocket() == INVALID_SOCKET)
			Handler().LogError(this, "SendBuf", 0, " * GetSocket() == INVALID_SOCKET", LOG_LEVEL_INFO);
		if (Connecting())
			Handler().LogError(this, "SendBuf", 0, " * Connecting()", LOG_LEVEL_INFO);
		if (CloseAndDelete())
			Handler().LogError(this, "SendBuf", 0, " * CloseAndDelete()", LOG_LEVEL_INFO);
		return;
	}
	if (!IsConnected())
	{
		Handler().LogError(this, "SendBuf", -1, "Attempt to write to a non-connected socket, will be sent on connect" ); // warning
		Buffer(buf, len);
		return;
	}
	if (m_obuf_top)
	{
		Buffer(buf, len);
		return;
	}
	int n = TryWrite(buf, len);
	if (n >= 0 && n < (int)len)
	{
		Buffer(buf + n, len - n);
	}
	// if ( data in buffer || !IsConnected )
	// {
	//   add to buffer
	// }
	// else
	// try_send
	// if any data is unsent, buffer it and set m_wfds

	// check output buffer set, set/reset m_wfds accordingly
	{
		bool br;
		bool bw;
		bool bx;
		Handler().Get(GetSocket(), br, bw, bx);
		if (m_obuf.size())
			Set(br, true);
		else
			Set(br, false);
	}
}


void TcpSocket::OnLine(const std::string& )
{
}


#ifdef _MSC_VER
#pragma warning(disable:4355)
#endif
TcpSocket::TcpSocket(const TcpSocket& s)
:StreamSocket(s)
,ibuf(0)
{
}
#ifdef _MSC_VER
#pragma warning(default:4355)
#endif


#ifdef ENABLE_SOCKS4
void TcpSocket::OnSocks4Connect()
{
	char request[1000];
	memset(request, 0, sizeof(request));
	request[0] = 4; // socks v4
	request[1] = 1; // command code: CONNECT
	{
		std::auto_ptr<SocketAddress> ad = GetClientRemoteAddress();
		if (ad.get())
		{
			struct sockaddr *p0 = (struct sockaddr *)*ad;
			struct sockaddr_in *p = (struct sockaddr_in *)p0;
			if (p -> sin_family == AF_INET)
			{
				memcpy(request + 2, &p -> sin_port, 2); // nwbo is ok here
				memcpy(request + 4, &p -> sin_addr, sizeof(struct in_addr));
			}
			else
			{
				/// \todo warn
			}
		}
		else
		{
			/// \todo warn
		}
	}
	strcpy(request + 8, GetSocks4Userid().c_str());
	size_t length = GetSocks4Userid().size() + 8 + 1;
	SendBuf(request, length);
	m_socks4_state = 0;
}


void TcpSocket::OnSocks4ConnectFailed()
{
	Handler().LogError(this,"OnSocks4ConnectFailed",0,"connection to socks4 server failed, trying direct connection",LOG_LEVEL_WARNING);
	if (!Handler().Socks4TryDirect())
	{
		SetConnecting(false);
		SetCloseAndDelete();
		OnConnectFailed(); // just in case
	}
	else
	{
		SetRetryClientConnect();
	}
}


bool TcpSocket::OnSocks4Read()
{
	switch (m_socks4_state)
	{
	case 0:
		ibuf.Read(&m_socks4_vn, 1);
		m_socks4_state = 1;
		break;
	case 1:
		ibuf.Read(&m_socks4_cd, 1);
		m_socks4_state = 2;
		break;
	case 2:
		if (GetInputLength() > 1)
		{
			ibuf.Read( (char *)&m_socks4_dstport, 2);
			m_socks4_state = 3;
		}
		else
		{
			return true;
		}
		break;
	case 3:
		if (GetInputLength() > 3)
		{
			ibuf.Read( (char *)&m_socks4_dstip, 4);
			SetSocks4(false);
			
			switch (m_socks4_cd)
			{
			case 90:
				OnConnect();
				Handler().LogError(this, "OnSocks4Read", 0, "Connection established", LOG_LEVEL_INFO);
				break;
			case 91:
			case 92:
			case 93:
				Handler().LogError(this,"OnSocks4Read",m_socks4_cd,"socks4 server reports connect failed",LOG_LEVEL_FATAL);
				SetConnecting(false);
				SetCloseAndDelete();
				OnConnectFailed();
				break;
			default:
				Handler().LogError(this,"OnSocks4Read",m_socks4_cd,"socks4 server unrecognized response",LOG_LEVEL_FATAL);
				SetCloseAndDelete();
				break;
			}
		}
		else
		{
			return true;
		}
		break;
	}
	return false;
}
#endif


void TcpSocket::Sendf(const char *format, ...)
{
	va_list ap;
	va_start(ap, format);
	char slask[5000]; // vsprintf / vsnprintf temporary
#ifdef _WIN32
	vsprintf(slask, format, ap);
#else
	vsnprintf(slask, 5000, format, ap);
#endif
	va_end(ap);
	Send( slask );
}


#ifdef HAVE_OPENSSL
void TcpSocket::OnSSLConnect()
{
	SetNonblocking(true);
	{
		if (m_ssl_ctx)
		{
DEB(			fprintf(stderr, "SSL Context already initialized - closing socket\n");)
			SetCloseAndDelete(true);
			return;
		}
		InitSSLClient();
	}
	if (m_ssl_ctx)
	{
		/* Connect the SSL socket */
		m_ssl = SSL_new(m_ssl_ctx);
		if (!m_ssl)
		{
DEB(			fprintf(stderr, " m_ssl is NULL\n");)
			SetCloseAndDelete(true);
			return;
		}
		SSL_set_mode(m_ssl, SSL_MODE_AUTO_RETRY);
		m_sbio = BIO_new_socket((int)GetSocket(), BIO_NOCLOSE);
		if (!m_sbio)
		{
DEB(			fprintf(stderr, " m_sbio is NULL\n");)
			SetCloseAndDelete(true);
			return;
		}
		SSL_set_bio(m_ssl, m_sbio, m_sbio);
		if (!SSLNegotiate())
		{
			SetSSLNegotiate();
		}
	}
	else
	{
		SetCloseAndDelete();
	}
}


void TcpSocket::OnSSLAccept()
{
	SetNonblocking(true);
	{
		if (m_ssl_ctx)
		{
DEB(			fprintf(stderr, "SSL Context already initialized - closing socket\n");)
			SetCloseAndDelete(true);
			return;
		}
		InitSSLServer();
		SetSSLServer();
	}
	if (m_ssl_ctx)
	{
		m_ssl = SSL_new(m_ssl_ctx);
		if (!m_ssl)
		{
DEB(			fprintf(stderr, " m_ssl is NULL\n");)
			SetCloseAndDelete(true);
			return;
		}
		SSL_set_mode(m_ssl, SSL_MODE_AUTO_RETRY);
		m_sbio = BIO_new_socket((int)GetSocket(), BIO_NOCLOSE);
		if (!m_sbio)
		{
DEB(			fprintf(stderr, " m_sbio is NULL\n");)
			SetCloseAndDelete(true);
			return;
		}
		SSL_set_bio(m_ssl, m_sbio, m_sbio);
//		if (!SSLNegotiate())
		{
			SetSSLNegotiate();
		}
	}
}


bool TcpSocket::SSLNegotiate()
{
	if (!IsSSLServer()) // client
	{
		int r = SSL_connect(m_ssl);
		if (r > 0)
		{
			SetSSLNegotiate(false);
			/// \todo: resurrect certificate check... client
//			CheckCertificateChain( "");//ServerHOST);
			SetNonblocking(false);
			//
			{
				SetConnected();
				if (GetOutputLength())
				{
					OnWrite();
				}
			}
#ifdef ENABLE_RECONNECT
			if (IsReconnect())
				OnReconnect();
			else
#endif
			{
				OnConnect();
			}
			Handler().LogError(this, "SSLNegotiate/SSL_connect", 0, "Connection established", LOG_LEVEL_INFO);
			return true;
		}
		else
		if (!r)
		{
			Handler().LogError(this, "SSLNegotiate/SSL_connect", 0, "Connection failed", LOG_LEVEL_INFO);
			SetSSLNegotiate(false);
			SetCloseAndDelete();
			OnSSLConnectFailed();
		}
		else
		{
			r = SSL_get_error(m_ssl, r);
			if (r != SSL_ERROR_WANT_READ && r != SSL_ERROR_WANT_WRITE)
			{
				Handler().LogError(this, "SSLNegotiate/SSL_connect", -1, "Connection failed", LOG_LEVEL_INFO);
DEB(				fprintf(stderr, "SSL_connect() failed - closing socket, return code: %d\n",r);)
				SetSSLNegotiate(false);
				SetCloseAndDelete(true);
				OnSSLConnectFailed();
			}
		}
	}
	else // server
	{
		int r = SSL_accept(m_ssl);
		if (r > 0)
		{
			SetSSLNegotiate(false);
			/// \todo: resurrect certificate check... server
//			CheckCertificateChain( "");//ClientHOST);
			SetNonblocking(false);
			//
			{
				SetConnected();
				if (GetOutputLength())
				{
					OnWrite();
				}
			}
			OnAccept();
			Handler().LogError(this, "SSLNegotiate/SSL_accept", 0, "Connection established", LOG_LEVEL_INFO);
			return true;
		}
		else
		if (!r)
		{
			Handler().LogError(this, "SSLNegotiate/SSL_accept", 0, "Connection failed", LOG_LEVEL_INFO);
			SetSSLNegotiate(false);
			SetCloseAndDelete();
			OnSSLAcceptFailed();
		}
		else
		{
			r = SSL_get_error(m_ssl, r);
			if (r != SSL_ERROR_WANT_READ && r != SSL_ERROR_WANT_WRITE)
			{
				Handler().LogError(this, "SSLNegotiate/SSL_accept", -1, "Connection failed", LOG_LEVEL_INFO);
DEB(				fprintf(stderr, "SSL_accept() failed - closing socket, return code: %d\n",r);)
				SetSSLNegotiate(false);
				SetCloseAndDelete(true);
				OnSSLAcceptFailed();
			}
		}
	}
	return false;
}


void TcpSocket::InitSSLClient()
{
	InitializeContext("", SSLv23_method());
}


void TcpSocket::InitSSLServer()
{
	Handler().LogError(this, "InitSSLServer", 0, "You MUST implement your own InitSSLServer method", LOG_LEVEL_FATAL);
	SetCloseAndDelete();
}


void TcpSocket::InitializeContext(const std::string& context, SSL_METHOD *meth_in)
{
	/* Create our context*/
	static std::map<std::string, SSL_CTX *> client_contexts;
	if (client_contexts.find(context) == client_contexts.end())
	{
		SSL_METHOD *meth = meth_in ? meth_in : SSLv3_method();
		m_ssl_ctx = client_contexts[context] = SSL_CTX_new(meth);
		SSL_CTX_set_mode(m_ssl_ctx, SSL_MODE_AUTO_RETRY);
	}
	else
	{
		m_ssl_ctx = client_contexts[context];
	}
}


void TcpSocket::InitializeContext(const std::string& context,const std::string& keyfile,const std::string& password,SSL_METHOD *meth_in)
{
	/* Create our context*/
	static std::map<std::string, SSL_CTX *> server_contexts;
	if (server_contexts.find(context) == server_contexts.end())
	{
		SSL_METHOD *meth = meth_in ? meth_in : SSLv3_method();
		m_ssl_ctx = server_contexts[context] = SSL_CTX_new(meth);
		SSL_CTX_set_mode(m_ssl_ctx, SSL_MODE_AUTO_RETRY);
		// session id
		if (context.size())
			SSL_CTX_set_session_id_context(m_ssl_ctx, (const unsigned char *)context.c_str(), (unsigned int)context.size());
		else
			SSL_CTX_set_session_id_context(m_ssl_ctx, (const unsigned char *)"--empty--", 9);
	}
	else
	{
		m_ssl_ctx = server_contexts[context];
	}

	/* Load our keys and certificates*/
	if (!(SSL_CTX_use_certificate_file(m_ssl_ctx, keyfile.c_str(), SSL_FILETYPE_PEM)))
	{
		Handler().LogError(this, "TcpSocket InitializeContext", 0, "Couldn't read certificate file " + keyfile, LOG_LEVEL_FATAL);
	}

	m_password = password;
	SSL_CTX_set_default_passwd_cb(m_ssl_ctx, SSL_password_cb);
	SSL_CTX_set_default_passwd_cb_userdata(m_ssl_ctx, this);
	if (!(SSL_CTX_use_PrivateKey_file(m_ssl_ctx, keyfile.c_str(), SSL_FILETYPE_PEM)))
	{
		Handler().LogError(this, "TcpSocket InitializeContext", 0, "Couldn't read private key file " + keyfile, LOG_LEVEL_FATAL);
	}
}


void TcpSocket::InitializeContext(const std::string& context,const std::string& certfile,const std::string& keyfile,const std::string& password,SSL_METHOD *meth_in)
{
	/* Create our context*/
	static std::map<std::string, SSL_CTX *> server_contexts;
	if (server_contexts.find(context) == server_contexts.end())
	{
		SSL_METHOD *meth = meth_in ? meth_in : SSLv3_method();
		m_ssl_ctx = server_contexts[context] = SSL_CTX_new(meth);
		SSL_CTX_set_mode(m_ssl_ctx, SSL_MODE_AUTO_RETRY);
		// session id
		if (context.size())
			SSL_CTX_set_session_id_context(m_ssl_ctx, (const unsigned char *)context.c_str(), (unsigned int)context.size());
		else
			SSL_CTX_set_session_id_context(m_ssl_ctx, (const unsigned char *)"--empty--", 9);
	}
	else
	{
		m_ssl_ctx = server_contexts[context];
	}

	/* Load our keys and certificates*/
	if (!(SSL_CTX_use_certificate_file(m_ssl_ctx, certfile.c_str(), SSL_FILETYPE_PEM)))
	{
		Handler().LogError(this, "TcpSocket InitializeContext", 0, "Couldn't read certificate file " + keyfile, LOG_LEVEL_FATAL);
	}

	m_password = password;
	SSL_CTX_set_default_passwd_cb(m_ssl_ctx, SSL_password_cb);
	SSL_CTX_set_default_passwd_cb_userdata(m_ssl_ctx, this);
	if (!(SSL_CTX_use_PrivateKey_file(m_ssl_ctx, keyfile.c_str(), SSL_FILETYPE_PEM)))
	{
		Handler().LogError(this, "TcpSocket InitializeContext", 0, "Couldn't read private key file " + keyfile, LOG_LEVEL_FATAL);
	}
}


int TcpSocket::SSL_password_cb(char *buf,int num,int rwflag,void *userdata)
{
	Socket *p0 = static_cast<Socket *>(userdata);
	TcpSocket *p = dynamic_cast<TcpSocket *>(p0);
	std::string pw = p ? p -> GetPassword() : "";
	if ( (size_t)num < pw.size() + 1)
	{
		return 0;
	}
	strcpy(buf,pw.c_str());
	return (int)pw.size();
}
#endif // HAVE_OPENSSL


int TcpSocket::Close()
{
	if (GetSocket() == INVALID_SOCKET) // this could happen
	{
		Handler().LogError(this, "Socket::Close", 0, "file descriptor invalid", LOG_LEVEL_WARNING);
		return 0;
	}
	int n;
	SetNonblocking(true);
	if (IsConnected() && !(GetShutdown() & SHUT_WR))
	{
		if (shutdown(GetSocket(), SHUT_WR) == -1)
		{
			// failed...
			Handler().LogError(this, "shutdown", Errno, StrError(Errno), LOG_LEVEL_ERROR);
		}
	}
	//
	char tmp[1000];
	if ((n = recv(GetSocket(),tmp,1000,0)) >= 0)
	{
		if (n)
		{
			Handler().LogError(this, "read() after shutdown", n, "bytes read", LOG_LEVEL_WARNING);
		}
	}
#ifdef HAVE_OPENSSL
	if (IsSSL() && m_ssl)
		SSL_shutdown(m_ssl);
	if (m_ssl)
	{
		SSL_free(m_ssl);
		m_ssl = NULL;
	}
#endif
	return Socket::Close();
}


#ifdef HAVE_OPENSSL
SSL_CTX *TcpSocket::GetSslContext()
{
	if (!m_ssl_ctx)
		Handler().LogError(this, "GetSslContext", 0, "SSL Context is NULL; check InitSSLServer/InitSSLClient", LOG_LEVEL_WARNING);
	return m_ssl_ctx;
}

SSL *TcpSocket::GetSsl()
{
	if (!m_ssl)
		Handler().LogError(this, "GetSsl", 0, "SSL is NULL; check InitSSLServer/InitSSLClient", LOG_LEVEL_WARNING);
	return m_ssl;
}
#endif


#ifdef ENABLE_RECONNECT
void TcpSocket::SetReconnect(bool x)
{
	m_b_reconnect = x;
}
#endif


void TcpSocket::OnRawData(const char *buf_in,size_t len)
{
}


size_t TcpSocket::GetInputLength()
{
	return ibuf.GetLength();
}


size_t TcpSocket::GetOutputLength()
{
	return m_output_length;
}


uint64_t TcpSocket::GetBytesReceived(bool clear)
{
	uint64_t z = m_bytes_received;
	if (clear)
		m_bytes_received = 0;
	return z;
}


uint64_t TcpSocket::GetBytesSent(bool clear)
{
	uint64_t z = m_bytes_sent;
	if (clear)
		m_bytes_sent = 0;
	return z;
}


#ifdef ENABLE_RECONNECT
bool TcpSocket::Reconnect()
{
	return m_b_reconnect;
}


void TcpSocket::SetIsReconnect(bool x)
{
	m_b_is_reconnect = x;
}


bool TcpSocket::IsReconnect()
{
	return m_b_is_reconnect;
}
#endif


#ifdef HAVE_OPENSSL
const std::string& TcpSocket::GetPassword()
{
	return m_password;
}
#endif


void TcpSocket::DisableInputBuffer(bool x)
{
	m_b_input_buffer_disabled = x;
}


void TcpSocket::OnOptions(int family,int type,int protocol,SOCKET s)
{
DEB(	fprintf(stderr, "Socket::OnOptions()\n");)
#ifdef SO_NOSIGPIPE
	SetSoNosigpipe(true);
#endif
	SetSoReuseaddr(true);
	SetSoKeepalive(true);
}


void TcpSocket::SetLineProtocol(bool x)
{
	StreamSocket::SetLineProtocol(x);
	DisableInputBuffer(x);
}


bool TcpSocket::SetTcpNodelay(bool x)
{
#ifdef TCP_NODELAY
	int optval = x ? 1 : 0;
	if (setsockopt(GetSocket(), IPPROTO_TCP, TCP_NODELAY, (char *)&optval, sizeof(optval)) == -1)
	{
		Handler().LogError(this, "setsockopt(IPPROTO_TCP, TCP_NODELAY)", Errno, StrError(Errno), LOG_LEVEL_FATAL);
		return false;
	}
	return true;
#else
	Handler().LogError(this, "socket option not available", 0, "TCP_NODELAY", LOG_LEVEL_INFO);
	return false;
#endif
}


TcpSocket::CircularBuffer::CircularBuffer(size_t size)
:buf(new char[2 * size])
,m_max(size)
,m_q(0)
,m_b(0)
,m_t(0)
,m_count(0)
{
}


TcpSocket::CircularBuffer::~CircularBuffer()
{
	delete[] buf;
}


bool TcpSocket::CircularBuffer::Write(const char *s,size_t l)
{
	if (m_q + l > m_max)
	{
		return false; // overflow
	}
	m_count += (unsigned long)l;
	if (m_t + l > m_max) // block crosses circular border
	{
		size_t l1 = m_max - m_t; // size left until circular border crossing
		// always copy full block to buffer(buf) + top pointer(m_t)
		// because we have doubled the buffer size for performance reasons
		memcpy(buf + m_t, s, l);
		memcpy(buf, s + l1, l - l1);
		m_t = l - l1;
		m_q += l;
	}
	else
	{
		memcpy(buf + m_t, s, l);
		memcpy(buf + m_max + m_t, s, l);
		m_t += l;
		if (m_t >= m_max)
			m_t -= m_max;
		m_q += l;
	}
	return true;
}


bool TcpSocket::CircularBuffer::Read(char *s,size_t l)
{
	if (l > m_q)
	{
		return false; // not enough chars
	}
	if (m_b + l > m_max) // block crosses circular border
	{
		size_t l1 = m_max - m_b;
		if (s)
		{
			memcpy(s, buf + m_b, l1);
			memcpy(s + l1, buf, l - l1);
		}
		m_b = l - l1;
		m_q -= l;
	}
	else
	{
		if (s)
		{
			memcpy(s, buf + m_b, l);
		}
		m_b += l;
		if (m_b >= m_max)
			m_b -= m_max;
		m_q -= l;
	}
	if (!m_q)
	{
		m_b = m_t = 0;
	}
	return true;
}


bool TcpSocket::CircularBuffer::Remove(size_t l)
{
	return Read(NULL, l);
}


size_t TcpSocket::CircularBuffer::GetLength()
{
	return m_q;
}


const char *TcpSocket::CircularBuffer::GetStart()
{
	return buf + m_b;
}


size_t TcpSocket::CircularBuffer::GetL()
{
	return (m_b + m_q > m_max) ? m_max - m_b : m_q;
}


size_t TcpSocket::CircularBuffer::Space()
{
	return m_max - m_q;
}


unsigned long TcpSocket::CircularBuffer::ByteCounter(bool clear)
{
	if (clear)
	{
		unsigned long x = m_count;
		m_count = 0;
		return x;
	}
	return m_count;
}


std::string TcpSocket::CircularBuffer::ReadString(size_t l)
{
	char *sz = new char[l + 1];
	if (!Read(sz, l)) // failed, debug printout in Read() method
	{
		delete[] sz;
		return "";
	}
	sz[l] = 0;
	std::string tmp = sz;
	delete[] sz;
	return tmp;
}


void TcpSocket::OnConnectTimeout()
{
	Handler().LogError(this, "connect", -1, "connect timeout", LOG_LEVEL_FATAL);
#ifdef ENABLE_SOCKS4
	if (Socks4())
	{
		OnSocks4ConnectFailed();
		// retry direct connection
	}
	else
#endif
	if (GetConnectionRetry() == -1 ||
		(GetConnectionRetry() && GetConnectionRetries() < GetConnectionRetry()) )
	{
		IncreaseConnectionRetries();
		// ask socket via OnConnectRetry callback if we should continue trying
		if (OnConnectRetry())
		{
			SetRetryClientConnect();
		}
		else
		{
			SetCloseAndDelete( true );
			/// \todo state reason why connect failed
			OnConnectFailed();
		}
	}
	else
	{
		SetCloseAndDelete(true);
		/// \todo state reason why connect failed
		OnConnectFailed();
	}
	//
	SetConnecting(false);
}


#ifdef _WIN32
void TcpSocket::OnException()
{
	if (Connecting())
	{
#ifdef ENABLE_SOCKS4
		if (Socks4())
			OnSocks4ConnectFailed();
		else
#endif
		if (GetConnectionRetry() == -1 ||
			(GetConnectionRetry() &&
			 GetConnectionRetries() < GetConnectionRetry() ))
		{
			// even though the connection failed at once, only retry after
			// the connection timeout
			// should we even try to connect again, when CheckConnect returns
			// false it's because of a connection error - not a timeout...
		}
		else
		{
			SetConnecting(false); // tnx snibbe
			SetCloseAndDelete();
			OnConnectFailed();
		}
		return;
	}
	// %! exception doesn't always mean something bad happened, this code should be reworked
	// errno valid here?
	int err = SoError();
	Handler().LogError(this, "exception on select", err, StrError(err), LOG_LEVEL_FATAL);
	SetCloseAndDelete();
}
#endif // _WIN32


int TcpSocket::Protocol()
{
	return IPPROTO_TCP;
}


void TcpSocket::SetTransferLimit(size_t sz)
{
	m_transfer_limit = sz;
}


void TcpSocket::OnTransferLimit()
{
}


#ifdef SOCKETS_NAMESPACE
}
#endif