(Unicode C++) SSH Parallel Remote Commands on Multiple Servers

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Shows how to execute a command in parallel on multiple servers.

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#include <CkSshW.h>

void ChilkatSample(void)
    {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // Executing a command on multiple servers simultaneously is straightforward.
    // It's just a matter of using one SSH object per server..
    CkSshW ssh1;
    CkSshW ssh2;
    CkSshW ssh3;

    int port = 22;
    bool success = ssh1.Connect(L"ssh-server1.com",port);
    if (success != true) {
        wprintf(L"%s\n",ssh1.lastErrorText());
        return;
    }

    // Authenticate using login/password:
    success = ssh1.AuthenticatePw(L"sshLogin1",L"sshPassword1");
    if (success != true) {
        wprintf(L"%s\n",ssh1.lastErrorText());
        return;
    }

    // Connect and authenticate with 2 more servers.
    // For brevity, the success/failure won't be checked...
    success = ssh2.Connect(L"ssh-server2.com",port);
    success = ssh2.AuthenticatePw(L"sshLogin2",L"sshPassword2");
    success = ssh3.Connect(L"ssh-server3.com",port);
    success = ssh3.AuthenticatePw(L"sshLogin3",L"sshPassword3");

    // Note: If we wanted, we could've used ConnectAsync and AuthenticatePwAsync
    // to do the connecting and authenticating in parallel...

    // The command to be run on each SSH server will sleep for 5 seconds,
    // and then show the current system date/time.
    const wchar_t *cmd = L"sleep 5; date";

    // Start each command
    int ssh1Channel = ssh1.QuickCmdSend(cmd);
    if (ssh1Channel < 0) {
        wprintf(L"%s\n",ssh1.lastErrorText());
        return;
    }

    // For brevity, we're not checking the return values here:
    int ssh2Channel = ssh2.QuickCmdSend(cmd);
    int ssh3Channel = ssh3.QuickCmdSend(cmd);

    // OK, at this point the command is running simultaneously on each server.

    // Now collect the results of each command.
    int pollTimeoutMs = 50;
    int numFinished = 0;
    int channel;
    // Note: You would rewrite this code to use arrays.
    bool ssh1Finished = false;
    bool ssh2Finished = false;
    bool ssh3Finished = false;
    while (numFinished < 3) {
        // Check to see if anything has finished.
        // QuickCmdCheck returns -1 if there are no errors and nothing else finished
        // QuickCmdCheck returns -2 if there was an error (such as a lost connection)
        // QuickCmdCheck returns a channel number if a channel finished.
        if (ssh1Finished != true) {
            channel = ssh1.QuickCmdCheck(pollTimeoutMs);
            if (channel == -2) {
                wprintf(L"%s\n",ssh1.lastErrorText());
                return;
            }

            if (channel == ssh1Channel) {
                wprintf(L"---- ssh1 channel %d finished ----\n",channel);
                wprintf(L"%s\n",ssh1.getReceivedText(channel,L"ansi"));
                numFinished = numFinished + 1;
                ssh1Finished = true;
            }

        }

        if (ssh2Finished != true) {
            channel = ssh2.QuickCmdCheck(pollTimeoutMs);
            if (channel == -2) {
                wprintf(L"%s\n",ssh2.lastErrorText());
                return;
            }

            if (channel == ssh2Channel) {
                wprintf(L"---- ssh2 channel %d finished ----\n",channel);
                wprintf(L"%s\n",ssh2.getReceivedText(channel,L"ansi"));
                numFinished = numFinished + 1;
                ssh2Finished = true;
            }

        }

        if (ssh3Finished != true) {
            channel = ssh3.QuickCmdCheck(pollTimeoutMs);
            if (channel == -2) {
                wprintf(L"%s\n",ssh3.lastErrorText());
                return;
            }

            if (channel == ssh3Channel) {
                wprintf(L"---- ssh3 channel %d finished ----\n",channel);
                wprintf(L"%s\n",ssh3.getReceivedText(channel,L"ansi"));
                numFinished = numFinished + 1;
                ssh3Finished = true;
            }

        }

    }

    // --------------
    // Sample output:

    // 	---- ssh2 channel 101 finished ----
    // 	Fri Dec 23 00:25:48 UTC 2016
    // 
    // 	---- ssh3 channel 102 finished ----
    // 	Thu Dec 22 18:25:12 CST 2016
    // 
    // 	---- ssh1 channel 100 finished ----
    // 	Thu Dec 22 18:25:48 CST 2016
    }