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(Unicode C) SSH Tunnel (Port Forwarding via direct-tcpip channel)Demonstrates how to create an SSH tunnel to a remote hostname:port via a direct-tcpip channel.
#include <C_CkSshW.h> void ChilkatSample(void) { HCkSshW ssh; const wchar_t *hostname; int port; BOOL success; int channelNum; const wchar_t *httpReq; BOOL caseSensitive; const wchar_t *matchStr; const wchar_t *responseHeader; int numBytesRead; int pollTimeoutMs; const wchar_t *htmlBody; // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. ssh = CkSshW_Create(); // Connect to an SSH server: // Hostname may be an IP address or hostname: hostname = L"192.168.1.117"; port = 22; success = CkSshW_Connect(ssh,hostname,port); if (success != TRUE) { wprintf(L"%s\n",CkSshW_lastErrorText(ssh)); CkSshW_Dispose(ssh); return; } // Wait a max of 5 seconds when reading responses.. CkSshW_putIdleTimeoutMs(ssh,5000); // Authenticate using login/password: success = CkSshW_AuthenticatePw(ssh,L"chilkat",L"myPassword"); if (success != TRUE) { wprintf(L"%s\n",CkSshW_lastErrorText(ssh)); CkSshW_Dispose(ssh); return; } // Open a direct-tcpip channel. We want the SSH server to connect // to www.chilkatsoft.com, port 80 (i.e. the web server). // Data sent through the SSH tunnel is forwarded to the remote // host:port. (Note: The remote host:port does not need to be // a web server. It can be anything. It can be your own // customer application server that listens on a port, or any // other type of server.) // When we read from the SSH channel, we'll be reading data // sent from the remote host:port (i.e. the web server in this // example). channelNum = CkSshW_OpenDirectTcpIpChannel(ssh,L"www.chilkatsoft.com",80); if (channelNum < 0) { wprintf(L"%s\n",CkSshW_lastErrorText(ssh)); CkSshW_Dispose(ssh); return; } // Build a simple HTTP GET request for http://www.chilkatsoft.com/xyz.html httpReq = L"GET /xyz123.html HTTP/1.1\r\nHost: www.chilkatsoft.com\r\n\r\n"; // Send the HTTP request: success = CkSshW_ChannelSendString(ssh,channelNum,httpReq,L"ansi"); if (success != TRUE) { wprintf(L"%s\n",CkSshW_lastErrorText(ssh)); CkSshW_Dispose(ssh); return; } // Get the HTTP response. // First read the HTTP response header which ends with a double CRLF. // Calling ChannelReceiveUntilMatch will receive until match string is seen, // or until a timeout occurs (IdleTimeoutMs property). ChannelReceiveUntilMatch // may read beyond the match string, but it will stop reading as soon as the match // string is seen. caseSensitive = FALSE; matchStr = L"\r\n\r\n"; success = CkSshW_ChannelReceiveUntilMatch(ssh,channelNum,matchStr,L"ansi",caseSensitive); if (success != TRUE) { wprintf(L"%s\n",CkSshW_lastErrorText(ssh)); CkSshW_Dispose(ssh); return; } // Extract the HTTP header from the receive buffer. // (GetReceiveTextS extracts up to and including the match string from the receive buffer) responseHeader = CkSshW_getReceivedTextS(ssh,channelNum,matchStr,L"ansi"); wprintf(L"---- HTTP Response Header ----\n"); wprintf(L"%s\n",responseHeader); // Now get the body of the HTTP response (this is the HTML content // of http://www.chilkatsoft.com/xyz.html // It's possible we've already received the entire HTTP response in the // call to ChannelReceiveUntilMatch. Therefore, we'll poll for any remaining data // and wait a max of .2 seconds. pollTimeoutMs = 200; numBytesRead = CkSshW_ChannelPoll(ssh,channelNum,pollTimeoutMs); // We're not checking for an error here. // A return value of -2 means that no data was available and the poll simply timed out (not an error) // A return value of -1 indicates an error. // A return value greater than 0 indicates that additional data was received. wprintf(L"---- HTML BODY ----\n"); // Extract the remainder of the accumulated data in the internal receive buffer. // This should be our HTML body: htmlBody = CkSshW_getReceivedText(ssh,channelNum,L"ansi"); wprintf(L"%s\n",htmlBody); // Close the channel: success = CkSshW_ChannelSendClose(ssh,channelNum); if (success != TRUE) { wprintf(L"%s\n",CkSshW_lastErrorText(ssh)); CkSshW_Dispose(ssh); return; } // Disconnect CkSshW_Disconnect(ssh); CkSshW_Dispose(ssh); } |
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