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(Unicode C) FTP through SSH Tunnel with Dynamic Port ForwardingDemonstrates how to start a background thread that runs a portable SSH tunnel w/ dynamic port forwarding that the foreground thread can be used for establishing FTP sessions through an SSH tunnel. Note: Some developers may be accustomed to starting an stunnel.exe proxy from https://www.stunnel.org. The stunnel.exe is not necessary here. Chilkat's background thread fulfills the task of what the external stunnel.exe does. Therefore, your application is self-contained, meaning that it can run anywhere because the SSH tunnel proxy is built-in.
#include <C_CkGlobalW.h> #include <C_CkSshTunnelW.h> #include <C_CkFtp2W.h> void ChilkatSample(void) { HCkGlobalW chilkatGlob; BOOL success; HCkSshTunnelW tunnel; const wchar_t *sshHostname; int sshPort; HCkFtp2W ftp; const wchar_t *localFilename; const wchar_t *remoteFilename; BOOL waitForThreadExit; // Starting in v9.5.0.49, all Chilkat classes can be unlocked at once at the beginning of a program // by calling UnlockBundle. It requires a Bundle unlock code. chilkatGlob = CkGlobalW_Create(); success = CkGlobalW_UnlockBundle(chilkatGlob,L"Anything for 30-day trial."); if (success != TRUE) { wprintf(L"%s\n",CkGlobalW_lastErrorText(chilkatGlob)); CkGlobalW_Dispose(chilkatGlob); return; } // This example requires Chilkat version 9.5.0.50 or greater. tunnel = CkSshTunnelW_Create(); sshHostname = L"sftp.example.com"; sshPort = 22; // Connect to an SSH server and establish the SSH tunnel: success = CkSshTunnelW_Connect(tunnel,sshHostname,sshPort); if (success != TRUE) { wprintf(L"%s\n",CkSshTunnelW_lastErrorText(tunnel)); CkGlobalW_Dispose(chilkatGlob); CkSshTunnelW_Dispose(tunnel); return; } // Authenticate with the SSH server via a login/password // or with a public key. // This example demonstrates SSH password authentication. success = CkSshTunnelW_AuthenticatePw(tunnel,L"mySshLogin",L"mySshPassword"); if (success != TRUE) { wprintf(L"%s\n",CkSshTunnelW_lastErrorText(tunnel)); CkGlobalW_Dispose(chilkatGlob); CkSshTunnelW_Dispose(tunnel); return; } // Indicate that the background SSH tunnel thread will behave as a SOCKS proxy server // with dynamic port forwarding: CkSshTunnelW_putDynamicPortForwarding(tunnel,TRUE); // We may optionally require that connecting clients authenticate with our SOCKS proxy server. // To do this, set an inbound username/password. Any connecting clients would be required to // use SOCKS5 with the correct username/password. // If no inbound username/password is set, then our SOCKS proxy server will accept both // SOCKS4 and SOCKS5 unauthenticated connections. CkSshTunnelW_putInboundSocksUsername(tunnel,L"chilkat123"); CkSshTunnelW_putInboundSocksPassword(tunnel,L"password123"); // Start the listen/accept thread to begin accepting SOCKS proxy client connections. // Listen on port 1080. success = CkSshTunnelW_BeginAccepting(tunnel,1080); if (success != TRUE) { wprintf(L"%s\n",CkSshTunnelW_lastErrorText(tunnel)); CkGlobalW_Dispose(chilkatGlob); CkSshTunnelW_Dispose(tunnel); return; } // Now that a background thread is running a SOCKS proxy server that forwards connections // through an SSH tunnel, it is possible to use any Chilkat implemented protocol that is SOCKS capable, // such as HTTP, POP3, SMTP, IMAP, FTP, etc. The protocol may use SSL/TLS because the SSL/TLS // will be passed through the SSH tunnel to the end-destination. Also, any number of simultaneous // connections may be routed through the SSH tunnel. ftp = CkFtp2W_Create(); // Indicate that the HTTP object is to use our portable SOCKS proxy/SSH tunnel running in our background thread. CkFtp2W_putSocksHostname(ftp,L"localhost"); // The SocksPort must equal the port passed to BeginAccepting above. CkFtp2W_putSocksPort(ftp,1080); CkFtp2W_putSocksVersion(ftp,5); // The SOCKS5 login/password set here must equal the InboundSocksUsername/Password set above. CkFtp2W_putSocksUsername(ftp,L"chilkat123"); CkFtp2W_putSocksPassword(ftp,L"password123"); // This is the actual FTP server domain or IP address, and the login/password for the user account on the destination FTP server. CkFtp2W_putHostname(ftp,L"ftp.someFtpServer.com"); CkFtp2W_putUsername(ftp,L"myLogin"); CkFtp2W_putPassword(ftp,L"myPassword"); CkFtp2W_putAuthTls(ftp,TRUE); // Connect and login (via the SSH tunnel) to the FTP server. success = CkFtp2W_Connect(ftp); if (success != TRUE) { wprintf(L"%s\n",CkFtp2W_lastErrorText(ftp)); CkGlobalW_Dispose(chilkatGlob); CkSshTunnelW_Dispose(tunnel); CkFtp2W_Dispose(ftp); return; } // Change to the remote directory where the file is located. // This step is only necessary if the file is not in the root directory // for the FTP account. success = CkFtp2W_ChangeRemoteDir(ftp,L"junk"); if (success != TRUE) { wprintf(L"%s\n",CkFtp2W_lastErrorText(ftp)); CkGlobalW_Dispose(chilkatGlob); CkSshTunnelW_Dispose(tunnel); CkFtp2W_Dispose(ftp); return; } localFilename = L"c:/temp/hamlet.xml"; remoteFilename = L"hamlet.xml"; // Download a file. (the data connection is also automatically established through the // SSH tunnel using dynamic port forwarding..) success = CkFtp2W_GetFile(ftp,remoteFilename,localFilename); if (success != TRUE) { wprintf(L"%s\n",CkFtp2W_lastErrorText(ftp)); CkGlobalW_Dispose(chilkatGlob); CkSshTunnelW_Dispose(tunnel); CkFtp2W_Dispose(ftp); return; } // The disconnect is disconnecting with the FTP server and closes the SSH tunnel. // The background tunnel thread is still running, and may be used for subsequent FTP connections, // or even connections for any other purpose, such as HTTP, IMAP, SMTP, POP3, etc. success = CkFtp2W_Disconnect(ftp); // When the app is finished with the tunnel, it can cleanup.. // Stop the background listen/accept thread: waitForThreadExit = TRUE; success = CkSshTunnelW_StopAccepting(tunnel,waitForThreadExit); if (success != TRUE) { wprintf(L"%s\n",CkSshTunnelW_lastErrorText(tunnel)); CkGlobalW_Dispose(chilkatGlob); CkSshTunnelW_Dispose(tunnel); CkFtp2W_Dispose(ftp); return; } // Close the SSH tunnel (would also kick any remaining connected clients). success = CkSshTunnelW_CloseTunnel(tunnel,waitForThreadExit); if (success != TRUE) { wprintf(L"%s\n",CkSshTunnelW_lastErrorText(tunnel)); CkGlobalW_Dispose(chilkatGlob); CkSshTunnelW_Dispose(tunnel); CkFtp2W_Dispose(ftp); return; } CkGlobalW_Dispose(chilkatGlob); CkSshTunnelW_Dispose(tunnel); CkFtp2W_Dispose(ftp); } |
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