Rust Requires Chilkat v11.0.0+

TCP Socket through SSH Tunnel (Port Forwarding)

See more Socket/SSL/TLS Examples

Demonstrates using Chilkat Socket to communicate to a TCP service through an SSH tunnel. This example will connect to an NIST time server and (using the old Time Protocol (RFC 868)), will read the current GMT time.

Note: This is not necessarily a recommended means for getting the current date/time. The most commonly used time protocol is the Network Time Protocol (RFC-1305). The intent of this example is to show how TCP communications can occur through an SSH tunnel.

Rust

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

let tunnel = chilkat::Socket::new();

let ssh_hostname = "sftp.example.com".to_string();
let ssh_port = 22;

// Connect to an SSH server and establish the SSH tunnel:
if tunnel.ssh_open_tunnel(&ssh_hostname, ssh_port).is_err() {
    println!("{}", tunnel.last_error_text());
    return;
}

// Authenticate with the SSH server via a login/password
// or with a public key.
// This example demonstrates SSH password authentication.
if tunnel.ssh_authenticate_pw("mySshLogin", "mySshPassword").is_err() {
    println!("{}", tunnel.last_error_text());
    return;
}

// OK, the SSH tunnel is setup.  Now open a channel within the tunnel.
// Once the channel is obtained, the Socket API may
// be used exactly the same as usual, except all communications
// are sent through the channel in the SSH tunnel.
// Any number of channels may be created from the same SSH tunnel.
// Multiple channels may coexist at the same time.

// Connect to an NIST time server and read the current date/time
let max_wait_ms = 4000;
let use_tls = false;
let channel = chilkat::Socket::new();
if tunnel.ssh_new_channel("time-c.nist.gov", 37, use_tls, max_wait_ms, &channel).is_err() {
    println!("{}", tunnel.last_error_text());
    return;
}

// The time server will send a big-endian 32-bit integer representing
// the number of seconds since since 00:00 (midnight) 1 January 1900 GMT.
// The ReceiveInt32 method will receive a 4-byte integer, but returns
// true or false to indicate success.  If successful, the integer
// is obtained via the ReceivedInt property.
let big_endian = true;
if channel.receive_int32(big_endian).is_err() {
    println!("{}", channel.last_error_text());
    return;
}

let dt = chilkat::DateTime::new();
let _ = dt.set_from_ntp_time(channel.received_int());

// Show the current local date/time
let b_local_time = true;
println!("Current local date/time: {}", dt.get_as_rfc822(b_local_time).unwrap_or_default());

// Close the SSH channel.
if channel.close(max_wait_ms).is_err() {
    println!("{}", channel.last_error_text());
    return;
}

// It is possible to create a new channel from the existing SSH tunnel for the next connection:
// Any number of channels may be created from the same SSH tunnel.
// Multiple channels may coexist at the same time.
if tunnel.ssh_new_channel("time-a.nist.gov", 37, use_tls, max_wait_ms, &channel).is_err() {
    println!("{}", tunnel.last_error_text());
    return;
}

// Review the LastErrorText to see that the connection was made via the SSH tunnel:
println!("{}", tunnel.last_error_text());

// Close the connection to time-a.nist.gov.  This is actually closing our channel
// within the SSH tunnel, but keeps the tunnel open for the next port-forwarded connection.
if channel.close(max_wait_ms).is_err() {
    println!("{}", channel.last_error_text());
    return;
}

// Finally, close the SSH tunnel.
if tunnel.ssh_close_tunnel().is_err() {
    println!("{}", tunnel.last_error_text());
    return;
}

println!("TCP SSH tunneling example completed.");