PHP

Check Whether SSH Channel EOF Was Received

Demonstrates the Chilkat Ssh.ChannelReceivedEof method, which reports whether an SSH EOF message has been received for a channel. The only argument is the channel number. EOF means the server will send no more ordinary channel data, but it does not close the channel.

Background: EOF and CLOSE are separate events, and the distinction matters when deciding whether a command has truly finished. A server commonly sends EOF first and CLOSE afterward; in that interval this method is true while ChannelReceivedClose is still false, and the channel remains open and counted. EOF is the signal that all output has been produced — useful when you want to stop reading without waiting for the full close handshake. It returns false for an invalid, released, or locally closed channel.

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<?php

use Chilkat2\Ssh;

// Demonstrates the Ssh.ChannelReceivedEof method, which reports whether an SSH EOF message has
// been received for a channel.  The only argument is the channel number.  EOF means the server
// will send no more ordinary channel data, but it does not close the channel.

$ssh = new Ssh();

$sshPort = 22;
try {
    $ssh->Connect('ssh.example.com', $sshPort);

    // 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.
    $password = 'mySshPassword';

    $ssh->AuthenticatePw('mySshLogin', $password);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

$channelNum = $ssh->OpenSessionChannel();
if ($channelNum < 0) {
    echo $ssh->LastErrorText, "\n";
    exit;
}

try {
    $ssh->SendReqExec($channelNum, 'ls -l /tmp');

    // IMPORTANT: Set a read timeout.  ReadTimeoutMs defaults to 0, which means no limit -- without
    // it, this call waits forever if the server never sends channel close.
    $ssh->ReadTimeoutMs = 15000;

    $ssh->ChannelReceiveToClose($channelNum);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

if ($ssh->ChannelReceivedEof($channelNum)) {
    echo "EOF was received -- no more ordinary channel data will arrive.\n";
} else {
    echo "No EOF has been received.\n";
}

$ssh->Disconnect();