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CAsyncProxySocket - CAsyncSocket derived class to connect through proxiesBy Tim KosseThis class allows you to establish connections through SOCKS4/5 and HTTP 1.1 proxies. |
VC6, VC7Win2K, WinXP, MFC, Dev
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This class is a CAsyncSocket derived class. With this class, you can connect through SOCKS4/5 and HTTP 1.1 proxies. This class works as semi-transparent layer between your own class and CAsyncSocket. This class is used in FileZilla, a powerful open-source FTP client. It can be found here. For more information about SOCKS4/5, go here. For more information about HTTP 1.1, go here and search for RFC2616 and RFC2617.
CAsyncSocket, you don't have to change much in your already existing code to use CAsyncProxySocket. To use it, you've to derive your own class from CAsyncProxySocket instead from CAsyncSocket, and you've to provide a definition for OnProxyOperationFailed(int nOpID) and OnListenFinished(unsigned long &retProxyIp,int &retProxyPort). When you create an instance of your derived class, you should call SetProxy. If you overload the OnReceive or OnConnect functions in your derived class, you have to call CAsyncProxySocket::OnReceive and CAsyncProxySocket::OnConnect as first instruction in your OnReceive and OnConnect functions.
Sample code:
CMyClass::OnReceive(int nErrorCode) { CAsyncProxySocket::OnReceive(nErrorCode); //Add you own implementation below: ... }
If an operation fails, OnProxyOperationFailed is called. There you can handle the error. int nOpID specifies the type of the operation that failed: PROXYOP_CONNECT when a connection attempt failed and PROXYOP_LISTEN when creating a listen socket failed.
If you want to use CAsyncProxySocket to create a listen socket, you have to use this overloaded function: virtual BOOL Listen(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, OnListenFinished is called. The parameters unsigned long &retProxyIp and int &retProxyPort will tell you the IP and the port of the listen socket. After that, you have to handle the OnAccept message and accept the connection.
void SetProxy(int nProxyType); void SetProxy(int nProxyType, CString ProxyHost, int nProxyPort); void SetProxy(int nProxyType, CString ProxyHost, int nProxyPort,CString ProxyUser, CString ProxyPass);
Call one of these functions to set the proxy type. Parameters:
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 GetProxyPeerName
GetProxyPeerName is 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 type.
const int GetLastProxyError() const;
Returns the last proxy error.
OnSocksOperationFailed will be called after Socket has been closed.
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Last Updated: 18 Dec 2001 Editor: Smitha Vijayan |
Copyright 2001 by Tim Kosse Everything else Copyright © CodeProject, 1999-2009 Web18 | Advertise on the Code Project |
