(C) Multi-Hop SSH (SSH Through SSH)

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

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#include <C_CkSsh.h>

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

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

    ssh1 = CkSsh_Create();

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

    // Connect directly to the 1st SSH server:
    success = CkSsh_Connect(ssh1,hostname,port);
    if (success != TRUE) {
        printf("%s\n",CkSsh_lastErrorText(ssh1));
        CkSsh_Dispose(ssh1);
        return;
    }

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

    // Authenticate using login/password:
    success = CkSsh_AuthenticatePw(ssh1,"myLogin","myPassword");
    if (success != TRUE) {
        printf("%s\n",CkSsh_lastErrorText(ssh1));
        CkSsh_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 = CkSsh_Create();
    success = CkSsh_ConnectThroughSsh(ssh2,ssh1,"someremoteserver.com",22);
    if (success != TRUE) {
        printf("%s\n",CkSsh_lastErrorText(ssh2));
        CkSsh_Dispose(ssh1);
        CkSsh_Dispose(ssh2);
        return;
    }

    CkSsh_putIdleTimeoutMs(ssh2,15000);

    // Authenticate with ssh2...
    success = CkSsh_AuthenticatePw(ssh2,"myLogin2","myPassword2");
    if (success != TRUE) {
        printf("%s\n",CkSsh_lastErrorText(ssh2));
        CkSsh_Dispose(ssh1);
        CkSsh_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 = CkSsh_OpenSessionChannel(ssh2);
    if (channelNum < 0) {
        printf("%s\n",CkSsh_lastErrorText(ssh2));
        CkSsh_Dispose(ssh1);
        CkSsh_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.
    CkSsh_Disconnect(ssh2);

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

    CkSsh_Disconnect(ssh1);


    CkSsh_Dispose(ssh1);
    CkSsh_Dispose(ssh2);

    }