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AsyncProxySocketLayer.cpp
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AsyncProxySocketLayer.cpp
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/*CAsyncProxySocketLayer by Tim Kosse (Tim.Kosse@gmx.de)
Version 1.6 (2003-03-26)
--------------------------------------------------------
Introduction:
-------------
This class is layer class for CAsyncSocketEx. With this class you
can connect through SOCKS4/5 and HTTP 1.1 proxies. This class works
as semi-transparent layer between CAsyncSocketEx and the actual socket.
This class is used in FileZilla, a powerful open-source FTP client.
It can be found under http://sourceforge.net/projects/filezilla
For more information about SOCKS4/5 goto
http://www.socks.nec.com/socksprot.html
For more information about HTTP 1.1 goto http://www.rfc-editor.org
and search for RFC2616
How to use?
-----------
You don't have to change much in you already existing code to use
CAsyncProxySocketLayer.
To use it, create an instance of CAsyncProxySocketLayer, call SetProxy
and attach it to a CAsyncSocketEx instance.
You have to process OnLayerCallback in you CAsyncSocketEx instance as it will
receive all layer nofications.
The following notifications are sent:
//Error codes
PROXYERROR_NOERROR 0
PROXYERROR_NOCONN 1 //Can't connect to proxy server, use GetLastError for more information
PROXYERROR_REQUESTFAILED 2 //Request failed, can't send data
PROXYERROR_AUTHREQUIRED 3 //Authentication required
PROXYERROR_AUTHTYPEUNKNOWN 4 //Authtype unknown or not supported
PROXYERROR_AUTHFAILED 5 //Authentication failed
PROXYERROR_AUTHNOLOGON 6
PROXYERROR_CANTRESOLVEHOST 7
//Status messages
PROXYSTATUS_LISTENSOCKETCREATED 8 //Called when a listen socket was created successfully. Unlike the normal listen function,
//a socksified socket has to connect to the proxy to negotiate the details with the server
//on which the listen socket will be created
//The two parameters will contain the ip and port of the listen socket on the server.
If you want to use CAsyncProxySocketLayer to create a listen socket, you
have to use this overloaded function:
BOOL PrepareListen(unsigned long serverIp);
serverIP is the IP of the server you are already connected
through the SOCKS proxy. You can't use listen sockets over a
SOCKS proxy without a primary connection. Listen sockets are only
supported by SOCKS proxies, this won't work with HTTP proxies.
When the listen socket is created successfully, the PROXYSTATUS_LISTENSOCKETCREATED
notification is sent. The parameters will tell you the ip and the port of the listen socket.
After it you have to handle the OnAccept message and accept the
connection.
Be carful when calling Accept: rConnected socket will NOT be filled! Instead use the instance which created the
listen socket, it will handle the data connection.
If you want to accept more than one connection, you have to create a listing socket for each of them!
Description of important functions and their parameters:
--------------------------------------------------------
void SetProxy(int nProxyType);
void SetProxy(int nProxyType, const char * pProxyHost, int nProxyPort);
void SetProxy(int nProxyType, const char * pProxyHost, int nProxyPort, const char *pProxyUser, const char * pProxyPass);
Call one of this functions to set the proxy type.
Parametes:
- nProxyType specifies the Proxy Type.
- ProxyHost and nProxyPort specify the address of the proxy
- ProxyUser and ProxyPass are only available for SOCKS5 proxies.
supported proxy types:
PROXYTYPE_NOPROXY
PROXYTYPE_SOCKS4
PROXYTYPE_SOCKS4A
PROXYTYPE_SOCKS5
PROXYTYPE_HTTP11
There are also some other functions:
GetProxyPeerName
Like GetPeerName of CAsyncSocket, but returns the address of the
server connected through the proxy. If using proxies, GetPeerName
only returns the address of the proxy.
int GetProxyType();
Returns the used proxy
const int GetLastProxyError() const;
Returns the last proxy error
License
-------
Feel free to use this class, as long as you don't claim that you wrote it
and this copyright notice stays intact in the source files.
If you use this class in commercial applications, please send a short message
to tim.kosse@gmx.de
Version history
---------------
- 1.6 got rid of MFC
- 1.5 released CAsyncSocketExLayer version
- 1.4 added Unicode support
- 1.3 added basic HTTP1.1 authentication
fixed memory leak in SOCKS5 code
OnSocksOperationFailed will be called after Socket has been closed
fixed some minor bugs
- 1.2 renamed into CAsyncProxySocketLayer
added HTTP1.1 proxy support
- 1.1 fixes all known bugs, mostly with SOCKS5 authentication
- 1.0 initial release
*/
#include "stdafx.h"
#include "AsyncProxySocketLayer.h"
#include "CBase64coding.hpp"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
extern CStringA ipstrA(uint32 nIP);
//////////////////////////////////////////////////////////////////////
// Konstruktion/Destruktion
//////////////////////////////////////////////////////////////////////
CAsyncProxySocketLayer::CAsyncProxySocketLayer()
{
m_nProxyOpID = 0;
m_nProxyOpState = 0;
m_pRecvBuffer = 0;
m_nRecvBufferPos = 0;
m_nProxyPeerIP = 0;
m_nProxyPeerPort = 0;
m_pProxyPeerHost = NULL;
m_pStrBuffer = NULL;
m_iStrBuffSize = 0;
m_ProxyData.nProxyType = PROXYTYPE_NOPROXY;
}
CAsyncProxySocketLayer::~CAsyncProxySocketLayer()
{
delete[] m_pProxyPeerHost;
ClearBuffer();
}
/////////////////////////////////////////////////////////////////////////////
// Member-Funktion CAsyncProxySocketLayer
void CAsyncProxySocketLayer::SetProxy(int nProxyType)
{
//Validate the parameters
ASSERT( nProxyType == PROXYTYPE_NOPROXY );
m_ProxyData.nProxyType = nProxyType;
}
void CAsyncProxySocketLayer::SetProxy(int nProxyType, const CStringA& strProxyHost, int ProxyPort)
{
//Validate the parameters
ASSERT( nProxyType == PROXYTYPE_SOCKS4 ||
nProxyType == PROXYTYPE_SOCKS4A ||
nProxyType == PROXYTYPE_SOCKS5 ||
nProxyType == PROXYTYPE_HTTP10 ||
nProxyType == PROXYTYPE_HTTP11 );
ASSERT( !m_nProxyOpID );
ASSERT( !strProxyHost.IsEmpty() );
ASSERT( ProxyPort > 0);
ASSERT( ProxyPort <= 65535 );
m_ProxyData.nProxyType = nProxyType;
m_ProxyData.strProxyHost = strProxyHost;
m_ProxyData.nProxyPort = ProxyPort;
m_ProxyData.bUseLogon = FALSE;
}
void CAsyncProxySocketLayer::SetProxy(int nProxyType, const CStringA& strProxyHost, int ProxyPort,
const CStringA& strProxyUser, const CStringA& strProxyPass)
{
//Validate the parameters
ASSERT( nProxyType == PROXYTYPE_SOCKS5 || nProxyType == PROXYTYPE_HTTP10 || nProxyType == PROXYTYPE_HTTP11 );
ASSERT( !m_nProxyOpID );
ASSERT( !strProxyHost.IsEmpty() );
ASSERT( ProxyPort > 0 );
ASSERT( ProxyPort <= 65535 );
m_ProxyData.nProxyType = nProxyType;
m_ProxyData.strProxyHost = strProxyHost;
m_ProxyData.nProxyPort = ProxyPort;
m_ProxyData.bUseLogon = TRUE;
m_ProxyData.strProxyUser = strProxyUser;
m_ProxyData.strProxyPass = strProxyPass;
}
CStringA GetSocks4Error(UINT ver, UINT cd)
{
if (ver != 0) {
CStringA strError;
strError.Format("Unknown protocol version: %u", ver);
return strError;
}
switch (cd)
{
case 90: return "";
case 91: return "Request rejected or failed";
case 92: return "Failed to connect to 'identd'";
case 93: return "'identd' user-id error";
default:{
CStringA strError;
strError.Format("Unknown command: %u", cd);
return strError;
}
}
}
CStringA GetSocks5Error(UINT rep)
{
switch (rep)
{
case 0x00: return "";
case 0x01: return "General SOCKS server failure";
case 0x02: return "Connection not allowed by ruleset";
case 0x03: return "Network unreachable";
case 0x04: return "Host unreachable";
case 0x05: return "Connection refused";
case 0x06: return "TTL expired";
case 0x07: return "Command not supported";
case 0x08: return "Address type not supported";
default:{
CStringA strError;
strError.Format("Unknown reply: %u", rep);
return strError;
}
}
}
void CAsyncProxySocketLayer::OnClose(int nErrorCode)
{
// We must route that event with the same functionality (PostMessage) which is used by
// the 'OnReceive' and 'OnConnect' event handlers. Otherwise the socket event queue of
// the underlying 'CAsyncSocketEx' may get out of sync.
TriggerEvent(FD_CLOSE, nErrorCode, TRUE);
}
void CAsyncProxySocketLayer::OnAccept(int nErrorCode)
{
// We must route that event with the same functionality (PostMessage) which is used by
// the 'OnReceive' and 'OnConnect' event handlers. Otherwise the socket event queue of
// the underlying 'CAsyncSocketEx' may get out of sync.
TriggerEvent(FD_ACCEPT, nErrorCode, TRUE);
}
void CAsyncProxySocketLayer::OnSend(int nErrorCode)
{
// We must route that event with the same functionality (PostMessage) which is used by
// the 'OnReceive' and 'OnConnect' event handlers. Otherwise the socket event queue of
// the underlying 'CAsyncSocketEx' may get out of sync.
TriggerEvent(FD_WRITE, nErrorCode, TRUE);
}
void CAsyncProxySocketLayer::OnReceive(int nErrorCode)
{
if (m_nProxyOpID == 0) {
TriggerEvent(FD_READ, nErrorCode, TRUE);
return;
}
if (nErrorCode)
TriggerEvent(FD_READ, nErrorCode, TRUE);
if (m_nProxyOpState == 0) //We should not receive a response yet!
return;
if (m_ProxyData.nProxyType == PROXYTYPE_SOCKS4 || m_ProxyData.nProxyType == PROXYTYPE_SOCKS4A)
{
if ( m_nProxyOpState == 1 // Response to initial connect or bind request
|| m_nProxyOpState == 2)// Response (2nd) to bind request
{
if (!m_pRecvBuffer)
m_pRecvBuffer = new char[8];
int numread = ReceiveNext(m_pRecvBuffer + m_nRecvBufferPos, 8 - m_nRecvBufferPos);
if (numread == SOCKET_ERROR) {
int nErrorCode = WSAGetLastError();
if (nErrorCode != WSAEWOULDBLOCK) {
DoLayerCallback(LAYERCALLBACK_LAYERSPECIFIC, PROXYERROR_REQUESTFAILED, nErrorCode);
if (m_nProxyOpID == PROXYOP_CONNECT)
TriggerEvent(FD_CONNECT, nErrorCode, TRUE);
else
TriggerEvent(FD_ACCEPT, nErrorCode, TRUE);
Reset();
ClearBuffer();
}
return;
}
m_nRecvBufferPos += numread;
// +----+----+----+----+----+----+----+----+
// | VN | CD | DSTPORT | DSTIP |
// +----+----+----+----+----+----+----+----+
// # of bytes: 1 1 2 4
//
// VN is the version of the reply code and should be 0. CD is the result
// code with one of the following values:
//
// 90: request granted
// 91: request rejected or failed
// 92: request rejected becasue SOCKS server cannot connect to
// identd on the client
// 93: request rejected because the client program and identd
// report different user-ids
if (m_nRecvBufferPos == 8)
{
TRACE("SOCKS4 response: VN=%u CD=%u DSTPORT=%u DSTIP=%s\n", (BYTE)m_pRecvBuffer[0], (BYTE)m_pRecvBuffer[1], ntohs(*(u_short*)&m_pRecvBuffer[2]), ipstrA(*(u_long*)&m_pRecvBuffer[4]));
if (m_pRecvBuffer[0] != 0 || m_pRecvBuffer[1] != 90) {
DoLayerCallback(LAYERCALLBACK_LAYERSPECIFIC, PROXYERROR_REQUESTFAILED, 0, (LPARAM)(LPCSTR)GetSocks4Error(m_pRecvBuffer[0], m_pRecvBuffer[1]));
if (m_nProxyOpID == PROXYOP_CONNECT)
TriggerEvent(FD_CONNECT, WSAECONNABORTED, TRUE);
else
TriggerEvent(FD_ACCEPT, WSAECONNABORTED, TRUE);
Reset();
ClearBuffer();
return;
}
// Proxy SHOULD answer with DSTPORT and DSTIP. Most proxies do, but some answer with 0.0.0.0:0
//ASSERT( m_nProxyPeerPort == *(u_short*)&m_pRecvBuffer[2] );
//ASSERT( m_nProxyPeerIP == 0 || m_nProxyPeerIP == *(u_long*)&m_pRecvBuffer[4] );
if ( (m_nProxyOpID == PROXYOP_CONNECT && m_nProxyOpState == 1) ||
(m_nProxyOpID == PROXYOP_BIND && m_nProxyOpState == 2) )
{
int nOpIDEvent = m_nProxyOpID == PROXYOP_CONNECT ? FD_CONNECT : FD_ACCEPT;
ClearBuffer();
Reset();
TriggerEvent(nOpIDEvent, 0, TRUE);
TriggerEvent(FD_READ, 0, TRUE);
TriggerEvent(FD_WRITE, 0, TRUE);
return;
}
else if (m_nProxyOpID == PROXYOP_BIND && m_nProxyOpState == 1)
{
// Listen socket created
m_nProxyOpState = 2;
u_long ip = *(u_long*)&m_pRecvBuffer[4];
if (ip == 0)
{
// No IP returned, use the IP of the proxy server
SOCKADDR SockAddr = {0};
int SockAddrLen = sizeof(SockAddr);
if (GetPeerName(&SockAddr, &SockAddrLen)) {
ip = ((LPSOCKADDR_IN)&SockAddr)->sin_addr.S_un.S_addr;
}
else {
DoLayerCallback(LAYERCALLBACK_LAYERSPECIFIC, PROXYERROR_REQUESTFAILED, 0);
if (m_nProxyOpID == PROXYOP_CONNECT)
TriggerEvent(FD_CONNECT, WSAECONNABORTED, TRUE);
else
TriggerEvent(FD_ACCEPT, WSAECONNABORTED, TRUE);
Reset();
ClearBuffer();
return;
}
}
t_ListenSocketCreatedStruct data;
data.ip = ip;
data.nPort = *(u_short*)&m_pRecvBuffer[2];
DoLayerCallback(LAYERCALLBACK_LAYERSPECIFIC, PROXYSTATUS_LISTENSOCKETCREATED, 0, (LPARAM)&data);
// Wait for 2nd response to bind request
}
ClearBuffer();
}
}
}
else if (m_ProxyData.nProxyType == PROXYTYPE_SOCKS5)
{
if ( m_nProxyOpState == 1 // Response to initialization request
|| m_nProxyOpState == 2)// Response to authentication request
{
if (!m_pRecvBuffer)
m_pRecvBuffer = new char[2];
int numread = ReceiveNext(m_pRecvBuffer + m_nRecvBufferPos, 2 - m_nRecvBufferPos);
if (numread == SOCKET_ERROR) {
int nErrorCode = WSAGetLastError();
if (nErrorCode != WSAEWOULDBLOCK) {
DoLayerCallback(LAYERCALLBACK_LAYERSPECIFIC, PROXYERROR_REQUESTFAILED, nErrorCode);
if (m_nProxyOpID == PROXYOP_CONNECT)
TriggerEvent(FD_CONNECT, nErrorCode, TRUE);
else
TriggerEvent(FD_ACCEPT, nErrorCode, TRUE);
Reset();
}
return;
}
m_nRecvBufferPos += numread;
if (m_nRecvBufferPos == 2)
{
TRACE("SOCKS5 response: VER=%u METHOD=%u\n", (BYTE)m_pRecvBuffer[0], (BYTE)m_pRecvBuffer[1]);
bool bIniReqFailed = m_nProxyOpState == 1 && m_pRecvBuffer[0] != 5; // Response to initialization request
bool bAuthReqFailed = m_nProxyOpState == 2 && m_pRecvBuffer[1] != 0; // Response to authentication request
if (bIniReqFailed || bAuthReqFailed) {
DoLayerCallback(LAYERCALLBACK_LAYERSPECIFIC, bAuthReqFailed ? PROXYERROR_AUTHFAILED : PROXYERROR_REQUESTFAILED, 0);
if (m_nProxyOpID == PROXYOP_CONNECT)
TriggerEvent(FD_CONNECT, WSAECONNABORTED, TRUE);
else
TriggerEvent(FD_ACCEPT, WSAECONNABORTED, TRUE);
Reset();
ClearBuffer();
return;
}
if (m_nProxyOpState == 1 && m_pRecvBuffer[1] != 0) // Authentication needed
{
if (m_pRecvBuffer[1] != 2) { // Unknown authentication type
DoLayerCallback(LAYERCALLBACK_LAYERSPECIFIC, PROXYERROR_AUTHTYPEUNKNOWN, 0);
if (m_nProxyOpID == PROXYOP_CONNECT)
TriggerEvent(FD_CONNECT, WSAECONNABORTED, TRUE);
else
TriggerEvent(FD_ACCEPT, WSAECONNABORTED, TRUE);
Reset();
ClearBuffer();
return;
}
if (!m_ProxyData.bUseLogon) {
DoLayerCallback(LAYERCALLBACK_LAYERSPECIFIC, PROXYERROR_AUTHNOLOGON, 0);
if (m_nProxyOpID == PROXYOP_CONNECT)
TriggerEvent(FD_CONNECT, WSAECONNABORTED, TRUE);
else
TriggerEvent(FD_ACCEPT, WSAECONNABORTED, TRUE);
Reset();
ClearBuffer();
return;
}
// Send authentication
//
// RFC 1929 - Username/Password Authentication for SOCKS V5
//
// +----+------+----------+------+----------+
// |VER | ULEN | UNAME | PLEN | PASSWD |
// +----+------+----------+------+----------+
// | 1 | 1 | 1 to 255 | 1 | 1 to 255 |
// +----+------+----------+------+----------+
//
// The VER field contains the current version of the subnegotiation,
// which is X'01'. The ULEN field contains the length of the UNAME field
// that follows. The UNAME field contains the username as known to the
// source operating system. The PLEN field contains the length of the
// PASSWD field that follows. The PASSWD field contains the password
// association with the given UNAME.
char cBuff[1 + 1 + 255 + 1 + 255];
int iLen = _snprintf(cBuff, _countof(cBuff), "\x01%c%s%c%s",
m_ProxyData.strProxyUser.GetLength(), m_ProxyData.strProxyUser,
m_ProxyData.strProxyPass.GetLength(), m_ProxyData.strProxyPass);
int res = SendNext(cBuff, iLen);
if (res == SOCKET_ERROR || res < iLen)
{
int nErrorCode = WSAGetLastError();
if (nErrorCode != WSAEWOULDBLOCK || res < iLen) {
DoLayerCallback(LAYERCALLBACK_LAYERSPECIFIC, PROXYERROR_REQUESTFAILED, nErrorCode);
if (m_nProxyOpID == PROXYOP_CONNECT)
TriggerEvent(FD_CONNECT, nErrorCode, TRUE);
else
TriggerEvent(FD_ACCEPT, nErrorCode, TRUE);
Reset();
return;
}
}
ClearBuffer();
m_nProxyOpState = 2;
return;
}
// Send connection request
const char* pszAsciiProxyPeerHost;
int iLenAsciiProxyPeerHost;
if (m_nProxyPeerIP == 0) {
pszAsciiProxyPeerHost = m_pProxyPeerHost;
iLenAsciiProxyPeerHost = strlen(pszAsciiProxyPeerHost);
}
else {
pszAsciiProxyPeerHost = 0;
iLenAsciiProxyPeerHost = 0;
}
char* pcReq = (char*)_alloca(10 + 1 + iLenAsciiProxyPeerHost);
pcReq[0] = 5;
pcReq[1] = (m_nProxyOpID == PROXYOP_CONNECT) ? 1 : 2;
pcReq[2] = 0;
int iReqLen = 3;
if (m_nProxyPeerIP) {
pcReq[iReqLen++] = 1;
*(u_long*)&pcReq[iReqLen] = m_nProxyPeerIP;
iReqLen += 4;
}
else {
pcReq[iReqLen++] = 3;
pcReq[iReqLen++] = (char)iLenAsciiProxyPeerHost;
memcpy(&pcReq[iReqLen], pszAsciiProxyPeerHost, iLenAsciiProxyPeerHost);
iReqLen += iLenAsciiProxyPeerHost;
}
*(u_short*)&pcReq[iReqLen] = m_nProxyPeerPort;
iReqLen += 2;
int res = SendNext(pcReq, iReqLen);
if (res == SOCKET_ERROR || res < iReqLen)
{
int nErrorCode = WSAGetLastError();
if (nErrorCode != WSAEWOULDBLOCK || res < iReqLen) {
DoLayerCallback(LAYERCALLBACK_LAYERSPECIFIC, PROXYERROR_REQUESTFAILED, nErrorCode);
if (m_nProxyOpID == PROXYOP_CONNECT)
TriggerEvent(FD_CONNECT, nErrorCode, TRUE);
else
TriggerEvent(FD_ACCEPT, nErrorCode, TRUE);
Reset();
return;
}
}
m_nProxyOpState = 3;
ClearBuffer();
}
}
else if ( m_nProxyOpState == 3 // Response to connection or bind request
|| m_nProxyOpState == 4) // Response (2nd) to bind request
{
if (!m_pRecvBuffer)
m_pRecvBuffer = new char[10];
int numread = ReceiveNext(m_pRecvBuffer + m_nRecvBufferPos, 10 - m_nRecvBufferPos);
if (numread == SOCKET_ERROR) {
int nErrorCode = WSAGetLastError();
if (nErrorCode != WSAEWOULDBLOCK) {
DoLayerCallback(LAYERCALLBACK_LAYERSPECIFIC, PROXYERROR_REQUESTFAILED, nErrorCode);
if (m_nProxyOpID == PROXYOP_CONNECT)
TriggerEvent(FD_CONNECT, nErrorCode, TRUE);
else
TriggerEvent(FD_ACCEPT, nErrorCode, TRUE);
Reset();
}
return;
}
m_nRecvBufferPos += numread;
if (m_nRecvBufferPos == 10)
{
TRACE("SOCKS5 response: VER=%u REP=%u RSV=%u ATYP=%u BND.ADDR=%s BND.PORT=%u\n", (BYTE)m_pRecvBuffer[0], (BYTE)m_pRecvBuffer[1], (BYTE)m_pRecvBuffer[2], (BYTE)m_pRecvBuffer[3], ipstrA(*(u_long*)&m_pRecvBuffer[4]), ntohs(*(u_short*)&m_pRecvBuffer[8]));
if (m_pRecvBuffer[0] != 5 || m_pRecvBuffer[1] != 0) {
DoLayerCallback(LAYERCALLBACK_LAYERSPECIFIC, PROXYERROR_REQUESTFAILED, 0, (LPARAM)(LPCSTR)GetSocks5Error(m_pRecvBuffer[1]));
if (m_nProxyOpID == PROXYOP_CONNECT)
TriggerEvent(FD_CONNECT, WSAECONNABORTED, TRUE);
else
TriggerEvent(FD_ACCEPT, WSAECONNABORTED, TRUE);
Reset();
ClearBuffer();
return;
}
if ( (m_nProxyOpID == PROXYOP_CONNECT && m_nProxyOpState == 3) ||
(m_nProxyOpID == PROXYOP_BIND && m_nProxyOpState == 4) )
{
int nOpIDEvent = m_nProxyOpID == PROXYOP_CONNECT ? FD_CONNECT : FD_ACCEPT;
Reset();
ClearBuffer();
TriggerEvent(nOpIDEvent, 0, TRUE);
TriggerEvent(FD_READ, 0, TRUE);
TriggerEvent(FD_WRITE, 0, TRUE);
return;
}
else if (m_nProxyOpID == PROXYOP_BIND && m_nProxyOpState == 3)
{
// Listen socket created
if (m_pRecvBuffer[3] != 1) { // Check which kind of address the response contains
DoLayerCallback(LAYERCALLBACK_LAYERSPECIFIC, PROXYERROR_REQUESTFAILED, 0, (LPARAM)"Unexpected ATYP received");
if (m_nProxyOpID == PROXYOP_CONNECT)
TriggerEvent(FD_CONNECT, WSAECONNABORTED, TRUE);
else
TriggerEvent(FD_ACCEPT, WSAECONNABORTED, TRUE);
Reset();
ClearBuffer();
return;
}
m_nProxyOpState = 4;
t_ListenSocketCreatedStruct data;
data.ip = *(u_long*)&m_pRecvBuffer[4];
data.nPort = *(u_short*)&m_pRecvBuffer[8];
DoLayerCallback(LAYERCALLBACK_LAYERSPECIFIC, PROXYSTATUS_LISTENSOCKETCREATED, 0, (LPARAM)&data);
// Wait for 2nd response to bind request
}
ClearBuffer();
}
}
}
else if (m_ProxyData.nProxyType == PROXYTYPE_HTTP10 || m_ProxyData.nProxyType == PROXYTYPE_HTTP11)
{
ASSERT( m_nProxyOpID == PROXYOP_CONNECT );
// Read everything which is currently available at the socket
//
bool bFoundEOH = false;
while (!bFoundEOH)
{
char cBuff[4096];
int iRead = ReceiveNext(cBuff, sizeof cBuff);
if (iRead == SOCKET_ERROR) {
int nErrorCode = WSAGetLastError();
if (nErrorCode != WSAEWOULDBLOCK) {
DoLayerCallback(LAYERCALLBACK_LAYERSPECIFIC, PROXYERROR_REQUESTFAILED, nErrorCode);
Reset();
ClearBuffer();
TriggerEvent(FD_CONNECT, nErrorCode, TRUE);
}
return;
}
else if (iRead == 0)
return;
// Safety check: Don't allow buffer to grow too large
char *pNewStrBuffer;
if ( m_iStrBuffSize + iRead > 4096
|| (pNewStrBuffer = (char*)realloc(m_pStrBuffer, m_iStrBuffSize + iRead)) == NULL) {
DoLayerCallback(LAYERCALLBACK_LAYERSPECIFIC, PROXYERROR_REQUESTFAILED, 0, (LPARAM)"Invalid HTTP response - Header size exceeds limit");
Reset();
ClearBuffer();
TriggerEvent(FD_CONNECT, WSAECONNABORTED, TRUE);
return;
}
m_pStrBuffer = pNewStrBuffer;
// Append read chunk to buffer
memcpy(m_pStrBuffer + m_iStrBuffSize, cBuff, iRead);
m_iStrBuffSize += iRead;
// Search for EOH (CRLFCRLF)
const char* pc = m_pStrBuffer;
int iMaxOff = m_iStrBuffSize - sizeof(DWORD);
for (int i = 0; i <= iMaxOff; i++) {
if (*(DWORD*)(pc++) == 0x0A0D0A0D) { // VC-BUG?: '\r\n\r\n' results in 0x0A0D0A0D too, although it should not!
bFoundEOH = true;
break;
}
}
}
ASSERT( bFoundEOH );
// Evaluate HTTP status
//
// We already know that we have a (CR)NL-character which can be safely used
// as a NUL-character in the context of 'sscanf'.
//
UINT uHttpStatus;
if (sscanf(m_pStrBuffer, "HTTP/%*u.%*u %u", &uHttpStatus) != 1 || uHttpStatus != 200)
{
if (*(DWORD*)m_pStrBuffer == 'PTTH')
{
TRACE("%hs\n", CStringA(m_pStrBuffer, m_iStrBuffSize).TrimRight("\r\n"));
char* pcNl = (char*)memchr(m_pStrBuffer, '\n', m_iStrBuffSize);
if (pcNl) {
*pcNl = '\0';
if (pcNl[-1] == '\r')
pcNl[-1] = '\0';
}
if (uHttpStatus == 407)
DoLayerCallback(LAYERCALLBACK_LAYERSPECIFIC, PROXYERROR_AUTHREQUIRED, 0);
else
DoLayerCallback(LAYERCALLBACK_LAYERSPECIFIC, PROXYERROR_REQUESTFAILED, 0, (LPARAM)m_pStrBuffer);
}
else {
DoLayerCallback(LAYERCALLBACK_LAYERSPECIFIC, PROXYERROR_REQUESTFAILED, 0, (LPARAM)"Invalid HTTP response");
}
Reset();
ClearBuffer();
TriggerEvent(FD_CONNECT, WSAECONNABORTED, TRUE);
return;
}
TRACE("%hs\n", CStringA(m_pStrBuffer, m_iStrBuffSize).TrimRight("\r\n"));
Reset();
ClearBuffer();
TriggerEvent(FD_CONNECT, 0, TRUE);
TriggerEvent(FD_READ, 0, TRUE);
TriggerEvent(FD_WRITE, 0, TRUE);
}
}
BOOL CAsyncProxySocketLayer::Connect(LPCSTR lpszHostAddress, UINT nHostPort)
{
ASSERT( lpszHostAddress != NULL );
if (!m_ProxyData.nProxyType)
//Connect normally because there is no proxy
return ConnectNext(lpszHostAddress, nHostPort);
//Translate the host address
SOCKADDR_IN sockAddr = {0};
sockAddr.sin_addr.s_addr = inet_addr(lpszHostAddress);
if (sockAddr.sin_addr.s_addr == INADDR_NONE)
{
LPHOSTENT lphost = gethostbyname(lpszHostAddress);
if (lphost != NULL)
sockAddr.sin_addr.s_addr = ((LPIN_ADDR)lphost->h_addr)->s_addr;
else
{
// Can't resolve hostname
if (m_ProxyData.nProxyType == PROXYTYPE_SOCKS4A ||
m_ProxyData.nProxyType == PROXYTYPE_SOCKS5 ||
m_ProxyData.nProxyType == PROXYTYPE_HTTP10 ||
m_ProxyData.nProxyType == PROXYTYPE_HTTP11)
{ //Can send domain names to proxy
//Conect to proxy server
BOOL res = ConnectNext(m_ProxyData.strProxyHost, m_ProxyData.nProxyPort);
if (!res) {
int nErrorCode = WSAGetLastError();
if (nErrorCode != WSAEWOULDBLOCK) {
DoLayerCallback(LAYERCALLBACK_LAYERSPECIFIC, PROXYERROR_NOCONN, nErrorCode);
return FALSE;
}
}
m_nProxyPeerPort = htons((u_short)nHostPort);
m_nProxyPeerIP = 0;
delete[] m_pProxyPeerHost;
m_pProxyPeerHost = NULL; // 'new' may throw an exception
m_pProxyPeerHost = new CHAR[strlen(lpszHostAddress) + 1];
strcpy(m_pProxyPeerHost, lpszHostAddress);
m_nProxyOpID = PROXYOP_CONNECT;
return TRUE;
}
else {
DoLayerCallback(LAYERCALLBACK_LAYERSPECIFIC, PROXYERROR_CANTRESOLVEHOST, 0);
WSASetLastError(WSAEINVAL);
return FALSE;
}
}
}
sockAddr.sin_family = AF_INET;
sockAddr.sin_port = htons((u_short)nHostPort);
BOOL res = CAsyncProxySocketLayer::Connect((SOCKADDR*)&sockAddr, sizeof(sockAddr));
if (res || WSAGetLastError() == WSAEWOULDBLOCK)
{
delete[] m_pProxyPeerHost;
m_pProxyPeerHost = NULL; // 'new' may throw an exception
m_pProxyPeerHost = new CHAR[strlen(lpszHostAddress) + 1];
strcpy(m_pProxyPeerHost, lpszHostAddress);
}
return res;
}
BOOL CAsyncProxySocketLayer::Connect(const SOCKADDR* lpSockAddr, int nSockAddrLen)
{
if (!m_ProxyData.nProxyType)
//Connect normally because there is no proxy
return ConnectNext(lpSockAddr, nSockAddrLen);
LPSOCKADDR_IN sockAddr = (LPSOCKADDR_IN)lpSockAddr;
//Save server details
m_nProxyPeerIP = sockAddr->sin_addr.S_un.S_addr;
m_nProxyPeerPort = sockAddr->sin_port;
delete[] m_pProxyPeerHost;
m_pProxyPeerHost = NULL;
m_nProxyOpID = PROXYOP_CONNECT;
BOOL res = ConnectNext(m_ProxyData.strProxyHost, m_ProxyData.nProxyPort);
if (!res) {
int nErrorCode = WSAGetLastError();
if (nErrorCode != WSAEWOULDBLOCK) {
DoLayerCallback(LAYERCALLBACK_LAYERSPECIFIC, PROXYERROR_NOCONN, nErrorCode);
return FALSE;
}
}
return res;
}
void CAsyncProxySocketLayer::OnConnect(int nErrorCode)
{
if (m_ProxyData.nProxyType == PROXYTYPE_NOPROXY) {
TriggerEvent(FD_CONNECT, nErrorCode, TRUE);
return;
}
if (m_nProxyOpID == 0) {
ASSERT(0);
return;
}
if (nErrorCode) {
// Can't connect to proxy
DoLayerCallback(LAYERCALLBACK_LAYERSPECIFIC, PROXYERROR_NOCONN, nErrorCode);
if (m_nProxyOpID == PROXYOP_CONNECT)
TriggerEvent(FD_CONNECT, nErrorCode, TRUE);
else
TriggerEvent(FD_ACCEPT, nErrorCode, TRUE);
Reset();
ClearBuffer();
return;
}
if (m_nProxyOpID == PROXYOP_CONNECT || m_nProxyOpID == PROXYOP_BIND)
{
if (m_nProxyOpState)
return; // Somehow OnConnect has been called more than once
ASSERT( m_ProxyData.nProxyType != PROXYTYPE_NOPROXY );
ClearBuffer();
if (m_ProxyData.nProxyType == PROXYTYPE_SOCKS4 || m_ProxyData.nProxyType == PROXYTYPE_SOCKS4A)
{
const char* pszAsciiProxyPeerHost;
int iSizeAsciiProxyPeerHost;
if (m_nProxyPeerIP == 0) {
pszAsciiProxyPeerHost = m_pProxyPeerHost;
iSizeAsciiProxyPeerHost = strlen(pszAsciiProxyPeerHost) + 1;
}
else {
pszAsciiProxyPeerHost = 0;
iSizeAsciiProxyPeerHost = 0;
}
// SOCKS 4
// ---------------------------------------------------------------------------
// +----+----+----+----+----+----+----+----+----+----+....+----+
// | VN | CD | DSTPORT | DSTIP | USERID |NULL|
// +----+----+----+----+----+----+----+----+----+----+....+----+
//# of bytes: 1 1 2 4 variable 1
char* pcReq = (char*)_alloca(9 + iSizeAsciiProxyPeerHost);
pcReq[0] = 4; // VN: 4
pcReq[1] = (m_nProxyOpID == PROXYOP_CONNECT) ? 1 : 2; // CD: 1=CONNECT, 2=BIND
*(u_short*)&pcReq[2] = m_nProxyPeerPort; // DSTPORT
int iReqLen = 4 + 4 + 1;
if (m_nProxyPeerIP == 0)
{
ASSERT( m_ProxyData.nProxyType == PROXYTYPE_SOCKS4A );
ASSERT( strcmp(pszAsciiProxyPeerHost, "") != 0 );
ASSERT( iSizeAsciiProxyPeerHost > 0 );
// For version 4A, if the client cannot resolve the destination host's
// domain name to find its IP address, it should set the first three bytes
// of DSTIP to NULL and the last byte to a non-zero value. (This corresponds
// to IP address 0.0.0.x, with x nonzero.)
// DSTIP: Set the IP to 0.0.0.x (x is nonzero)
pcReq[4] = 0;
pcReq[5] = 0;
pcReq[6] = 0;
pcReq[7] = 1;
pcReq[8] = 0; // Terminating NUL-byte for USERID
// Following the NULL byte terminating USERID, the client must send the
// destination domain name and termiantes it with another NULL byte.
// Add hostname (including terminating NUL-byte)
memcpy(&pcReq[9], pszAsciiProxyPeerHost, iSizeAsciiProxyPeerHost);
iReqLen += iSizeAsciiProxyPeerHost;
}
else {
*(u_long*)&pcReq[4] = m_nProxyPeerIP; // DSTIP
pcReq[8] = 0; // Terminating NUL-byte for USERID
}
int res = SendNext(pcReq, iReqLen);
if (res == SOCKET_ERROR) {
int nErrorCode = WSAGetLastError();
DoLayerCallback(LAYERCALLBACK_LAYERSPECIFIC, PROXYERROR_REQUESTFAILED, nErrorCode);
if (m_nProxyOpID == PROXYOP_CONNECT)
TriggerEvent(FD_CONNECT, (nErrorCode == WSAEWOULDBLOCK) ? WSAECONNABORTED : nErrorCode, TRUE);
else
TriggerEvent(FD_ACCEPT, nErrorCode, TRUE);
Reset();
ClearBuffer();
return;
}
else if (res < iReqLen) {
DoLayerCallback(LAYERCALLBACK_LAYERSPECIFIC, PROXYERROR_REQUESTFAILED, 0);
if (m_nProxyOpID == PROXYOP_CONNECT)
TriggerEvent(FD_CONNECT, WSAECONNABORTED, TRUE);
else
TriggerEvent(FD_ACCEPT, WSAECONNABORTED, TRUE);
Reset();
ClearBuffer();
return;
}
}
else if (m_ProxyData.nProxyType == PROXYTYPE_SOCKS5)
{
// SOCKS 5
// -------------------------------------------------------------------------------------------
// The client connects to the server, and sends a version identifier/method selection message:
// +----+----------+----------+
// |VER | NMETHODS | METHODS |
// +----+----------+----------+
// | 1 | 1 | 1 to 255 |
// +----+----------+----------+
//
// The values currently defined for METHOD are:
//
// o X'00' NO AUTHENTICATION REQUIRED
// o X'01' GSSAPI
// o X'02' USERNAME/PASSWORD
// o X'03' to X'7F' IANA ASSIGNED
// o X'80' to X'FE' RESERVED FOR PRIVATE METHODS
// o X'FF' NO ACCEPTABLE METHODS
int iReqLen;
char acReq[4];
acReq[0] = 5; // VER: 5
if (m_ProxyData.bUseLogon) {
acReq[1] = 2; // NMETHODS: 2
acReq[2] = 2; // METHOD #1: 2 (USERNAME/PASSWORD)
acReq[3] = 0; // METHOD #2: 0 (NO AUTHENTICATION)
iReqLen = 4;
}
else {
acReq[1] = 1; // NMETHODS: 1
acReq[2] = 0; // METHOD #1: 0 (NO AUTHENTICATION)
iReqLen = 3;
}
int res = SendNext(acReq, iReqLen);
if (res == SOCKET_ERROR) {
int nErrorCode = WSAGetLastError();
DoLayerCallback(LAYERCALLBACK_LAYERSPECIFIC, PROXYERROR_REQUESTFAILED, nErrorCode);
if (m_nProxyOpID == PROXYOP_CONNECT)
TriggerEvent(FD_CONNECT, (nErrorCode == WSAEWOULDBLOCK) ? WSAECONNABORTED : nErrorCode, TRUE);
else
TriggerEvent(FD_ACCEPT, nErrorCode, TRUE);
Reset();
ClearBuffer();
return;
}
else if (res < iReqLen) {
DoLayerCallback(LAYERCALLBACK_LAYERSPECIFIC, PROXYERROR_REQUESTFAILED, 0);
if (m_nProxyOpID == PROXYOP_CONNECT)
TriggerEvent(FD_CONNECT, WSAECONNABORTED, TRUE);
else
TriggerEvent(FD_ACCEPT, WSAECONNABORTED, TRUE);
Reset();
ClearBuffer();
return;
}
}
else if (m_ProxyData.nProxyType == PROXYTYPE_HTTP10 || m_ProxyData.nProxyType == PROXYTYPE_HTTP11)
{
const char* pszHost;
if (m_pProxyPeerHost && m_pProxyPeerHost[0] != '\0')
pszHost = m_pProxyPeerHost;
else
pszHost = inet_ntoa(*(in_addr*)&m_nProxyPeerIP);
UINT nProxyPeerPort = ntohs((u_short)m_nProxyPeerPort);
char szHttpReq[4096];
int iHttpReqLen;
if (!m_ProxyData.bUseLogon)
{
if (m_ProxyData.nProxyType == PROXYTYPE_HTTP10) {
// The reason why we offer HTTP/1.0 support is just because it
// allows us to *not *send the "Host" field, thus saving overhead.
iHttpReqLen = _snprintf(szHttpReq, _countof(szHttpReq),
"CONNECT %s:%u HTTP/1.0\r\n"
"\r\n",
pszHost, nProxyPeerPort);
}
else {
// "Host" field is a MUST for HTTP/1.1 according RFC 2161
iHttpReqLen = _snprintf(szHttpReq, _countof(szHttpReq),
"CONNECT %s:%u HTTP/1.1\r\n"
"Host: %s:%u\r\n"
"\r\n",
pszHost, nProxyPeerPort, pszHost, nProxyPeerPort);
}
}
else
{
char szUserPass[512];
int iUserPassLen = _snprintf(szUserPass, _countof(szUserPass), "%s:%s", m_ProxyData.strProxyUser, m_ProxyData.strProxyPass);
char szUserPassBase64[2048];
CBase64Coding base64coding;
if (!base64coding.Encode(szUserPass, iUserPassLen, szUserPassBase64)) {
DoLayerCallback(LAYERCALLBACK_LAYERSPECIFIC, PROXYERROR_REQUESTFAILED, 0);
if (m_nProxyOpID == PROXYOP_CONNECT)
TriggerEvent(FD_CONNECT, WSAECONNABORTED, TRUE);
else
TriggerEvent(FD_ACCEPT, WSAECONNABORTED, TRUE);
Reset();
ClearBuffer();