Unicode C++

Open a Custom SSH Channel Type

Demonstrates the Chilkat Ssh.OpenCustomChannel method, which requests a channel whose application-defined type is supplied as the only argument. It returns the channel number, or -1 if the server rejects the channel. The server must implement that channel type.

Background: The SSH protocol allows vendor- and application-specific channel types beyond the standard session and direct-tcpip kinds; by convention these carry an @domain suffix to avoid name collisions. This method is the escape hatch for talking to a server that implements such a type. On rejection, inspect ChannelOpenFailCode to learn why.

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#include <CkSshW.h>

void ChilkatSample(void)
    {
    bool success = false;

    //  Demonstrates the Ssh.OpenCustomChannel method, which requests a custom SSH channel whose
    //  application-defined type is supplied as the only argument.  It returns the channel number,
    //  or -1 if the server rejects the channel.  The server must implement that channel type.

    CkSshW ssh;

    int sshPort = 22;
    success = ssh.Connect(L"ssh.example.com",sshPort);
    if (success == false) {
        wprintf(L"%s\n",ssh.lastErrorText());
        return;
    }

    //  Normally you would not hard-code the password in source.  You should instead obtain it
    //  from an interactive prompt, environment variable, or a secrets vault.
    const wchar_t *password = L"mySshPassword";

    success = ssh.AuthenticatePw(L"mySshLogin",password);
    if (success == false) {
        wprintf(L"%s\n",ssh.lastErrorText());
        return;
    }

    //  Request an application-defined channel type.  The server must support it.
    const wchar_t *channelType = L"my-custom-channel@example.com";
    int channelNum = ssh.OpenCustomChannel(channelType);
    if (channelNum < 0) {
        wprintf(L"%s\n",ssh.lastErrorText());
        return;
    }

    wprintf(L"Opened custom channel: %d\n",channelNum);

    //  The channel is used with the normal channel send, receive, EOF, CLOSE, and release methods.

    ssh.Disconnect();
    }