Unicode C

Multi-Hop SSH (SSH Through SSH)

See more SSH Examples

Demonstrates how to SSH through one SSH server to get to another SSH server. The scheme looks like this:

Application => ServerSSH1 => ServerSSH2

The ConnectThroughSsh method is added in Chilkat version 9.5.0.55 to accomplish this task. Technically, it should be possible to chain any number of servers using the ConnectThroughSsh multiple times:

Application => ServerSSH1 => ServerSSH2 ==> ServerSSH3 => ... => ServerSSHN

Unicode C

#include <C_CkSshW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkSshW ssh1;
    const wchar_t *hostname;
    const wchar_t *port;
    HCkSshW ssh2;
    int channelNum;

    success = FALSE;

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    ssh1 = CkSshW_Create();

    // Hostname may be an IP address or domain name:
    hostname = L"192.168.1.108";
    port = 22;

    // Connect directly to the 1st SSH server:
    success = CkSshW_Connect(ssh1,hostname,port);
    if (success != TRUE) {
        wprintf(L"%s\n",CkSshW_lastErrorText(ssh1));
        CkSshW_Dispose(ssh1);
        return;
    }

    // Wait a max of 15 seconds when reading responses..
    CkSshW_putIdleTimeoutMs(ssh1,15000);

    // Authenticate using login/password:
    success = CkSshW_AuthenticatePw(ssh1,L"myLogin",L"myPassword");
    if (success != TRUE) {
        wprintf(L"%s\n",CkSshW_lastErrorText(ssh1));
        CkSshW_Dispose(ssh1);
        return;
    }

    // Connect through the 1st SSH connection to reach a 2nd SSH server.
    // Note: Any number of SSH connections may be simultaneously tunneled through a single
    // existing SSH connection.
    ssh2 = CkSshW_Create();
    success = CkSshW_ConnectThroughSsh(ssh2,ssh1,L"someremoteserver.com",22);
    if (success != TRUE) {
        wprintf(L"%s\n",CkSshW_lastErrorText(ssh2));
        CkSshW_Dispose(ssh1);
        CkSshW_Dispose(ssh2);
        return;
    }

    CkSshW_putIdleTimeoutMs(ssh2,15000);

    // Authenticate with ssh2...
    success = CkSshW_AuthenticatePw(ssh2,L"myLogin2",L"myPassword2");
    if (success != TRUE) {
        wprintf(L"%s\n",CkSshW_lastErrorText(ssh2));
        CkSshW_Dispose(ssh1);
        CkSshW_Dispose(ssh2);
        return;
    }

    // The application may now is connected and authenticated with ssh2.
    // The application can do whatever it desires just as if it was directly
    // connected to ssh2.   For example, the application might open
    // a session channel to send commands or start a remote shell..
    channelNum = CkSshW_OpenSessionChannel(ssh2);
    if (channelNum < 0) {
        wprintf(L"%s\n",CkSshW_lastErrorText(ssh2));
        CkSshW_Dispose(ssh1);
        CkSshW_Dispose(ssh2);
        return;
    }

    // ...
    // ...
    // ...

    // Close the connection with ssh2.  (This closes the the tunnel through ssh1.)
    // The connection with ssh1 is still alive, and may be used for more connections.
    CkSshW_Disconnect(ssh2);

    // ...
    // ...
    // ...

    CkSshW_Disconnect(ssh1);


    CkSshW_Dispose(ssh1);
    CkSshW_Dispose(ssh2);

    }