(C) SSH Exec (Execute Command Line)

Shows how to execute a command on an SSH server and retrieve the command output.

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#include <C_CkSsh.h>

void ChilkatSample(void)
    {
    HCkSsh ssh;
    const char *hostname;
    int port;
    BOOL success;
    int channelNum;
    const char *cmd1;
    const char *cmd2;
    const char *cmd3;
    const char *cmd4;
    const char *cmd5;
    const char *cmd6;
    const char *cmdOutput;

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

    ssh = CkSsh_Create();

    // Connect to an SSH server:

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

    success = CkSsh_Connect(ssh,hostname,port);
    if (success != TRUE) {
        printf("%s\n",CkSsh_lastErrorText(ssh));
        CkSsh_Dispose(ssh);
        return;
    }

    // Wait a max of 5 seconds when reading responses..
    CkSsh_putIdleTimeoutMs(ssh,5000);

    // Authenticate using login/password:
    success = CkSsh_AuthenticatePw(ssh,"myLogin","myPassword");
    if (success != TRUE) {
        printf("%s\n",CkSsh_lastErrorText(ssh));
        CkSsh_Dispose(ssh);
        return;
    }

    // Open a session channel.  (It is possible to have multiple
    // session channels open simultaneously.)

    channelNum = CkSsh_OpenSessionChannel(ssh);
    if (channelNum < 0) {
        printf("%s\n",CkSsh_lastErrorText(ssh));
        CkSsh_Dispose(ssh);
        return;
    }

    // The SendReqExec method starts a command on the remote
    // server.   The syntax of the command string depends on the
    // default shell used on the remote server to run the command.
    // On Windows systems it is CMD.EXE.  On UNIX/Linux
    // systems the user's default shell is typically defined in /etc/password.

    // Here are some examples of command lines for <b>Windows SSH servers</b>:

    // Get a directory listing:
    cmd1 = "dir";

    // Do a nameserver lookup:
    cmd2 = "nslookup chilkatsoft.com";

    // List a specific directory.  Given that the shell is CMD.EXE, backslashes must
    // be used:
    cmd3 = "dir \\temp";

    // Execute a sequence of commands.  The syntax for CMD.EXE may be found
    // here: http://technet.microsoft.com/en-us/library/bb490880.aspx.  Notice how the commands
    // are separated by "&&" and the entire command must be enclosed in quotes:
    cmd4 = "\"cd \\temp&&dir\"";

    // Here are two examples of command lines for <b>Linux/UNIX SSH servers</b>:

    // Get a directory listing:
    cmd5 = "ls -l /tmp";

    // Run a series of commands (syntax may depend on your default shell):
    cmd6 = "cd /etc; ls -la";

    // Request a directory listing on the remote server:
    // If your server is Windows, change the string from "ls" to "dir"
    success = CkSsh_SendReqExec(ssh,channelNum,"ls");
    if (success != TRUE) {
        printf("%s\n",CkSsh_lastErrorText(ssh));
        CkSsh_Dispose(ssh);
        return;
    }

    // Call ChannelReceiveToClose to read 
    // output until the server's corresponding "channel close" is received.
    success = CkSsh_ChannelReceiveToClose(ssh,channelNum);
    if (success != TRUE) {
        printf("%s\n",CkSsh_lastErrorText(ssh));
        CkSsh_Dispose(ssh);
        return;
    }

    // Let's pickup the accumulated output of the command:
    cmdOutput = CkSsh_getReceivedText(ssh,channelNum,"ansi");
    if (CkSsh_getLastMethodSuccess(ssh) != TRUE) {
        printf("%s\n",CkSsh_lastErrorText(ssh));
        CkSsh_Dispose(ssh);
        return;
    }

    // Display the remote shell's command output:
    printf("%s\n",cmdOutput);

    // Disconnect
    CkSsh_Disconnect(ssh);


    CkSsh_Dispose(ssh);

    }