(Swift 3,4,5...) SSH Tunnel (Port Forwarding via direct-tcpip channel)

Demonstrates how to create an SSH tunnel to a remote hostname:port via a direct-tcpip channel.

Chilkat Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

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

    let ssh = CkoSsh()!

    // Connect to an SSH server:
    var hostname: String?
    var port: Int

    // Hostname may be an IP address or hostname:
    hostname = "192.168.1.117"
    port = 22

    var success: Bool = ssh.connect(hostname, port: port)
    if success != true {
        print("\(ssh.lastErrorText!)")
        return
    }

    // Wait a max of 5 seconds when reading responses..
    ssh.idleTimeoutMs = 5000

    // Authenticate using login/password:
    success = ssh.authenticatePw("chilkat", password: "myPassword")
    if success != true {
        print("\(ssh.lastErrorText!)")
        return
    }

    // Open a direct-tcpip channel.  We want the SSH server to connect
    // to www.chilkatsoft.com, port 80 (i.e. the web server).
    // Data sent through the SSH tunnel is forwarded to the remote
    // host:port.  (Note: The remote host:port does not need to be 
    // a web server.  It can be anything.  It can be your own
    // customer application server that listens on a port, or any
    // other type of server.)
    // When we read from the SSH channel, we'll be reading data
    // sent from the remote host:port (i.e. the web server in this
    // example).
    var channelNum: Int
    channelNum = ssh.openDirectTcpIpChannel("www.chilkatsoft.com", port: 80).intValue
    if channelNum < 0 {
        print("\(ssh.lastErrorText!)")
        return
    }

    // Build a simple HTTP GET request for http://www.chilkatsoft.com/xyz.html
    var httpReq: String? = "GET /xyz123.html HTTP/1.1\r\nHost: www.chilkatsoft.com\r\n\r\n"

    // Send the HTTP request:
    success = ssh.channelSendString(channelNum, strData: httpReq, charset: "ansi")
    if success != true {
        print("\(ssh.lastErrorText!)")
        return
    }

    // Get the HTTP response.
    // First read the HTTP response header which ends with a double CRLF.
    // Calling ChannelReceiveUntilMatch will receive until match string is seen,
    // or until a timeout occurs (IdleTimeoutMs property).  ChannelReceiveUntilMatch
    // may read beyond the match string, but it will stop reading as soon as the match
    // string is seen.
    var caseSensitive: Bool = false
    var matchStr: String? = "\r\n\r\n"
    success = ssh.channelReceive(untilMatch: channelNum, matchPattern: matchStr, charset: "ansi", caseSensitive: caseSensitive)
    if success != true {
        print("\(ssh.lastErrorText!)")
        return
    }

    // Extract the HTTP header from the receive buffer.
    // (GetReceiveTextS extracts up to and including the match string from the receive buffer)
    var responseHeader: String?
    responseHeader = ssh.getReceivedTextS(channelNum, substr: matchStr, charset: "ansi")
    print("---- HTTP Response Header ----")
    print("\(responseHeader!)")

    // Now get the body of the HTTP response (this is the HTML content
    // of http://www.chilkatsoft.com/xyz.html
    // It's possible we've already received the entire HTTP response in the
    // call to ChannelReceiveUntilMatch.  Therefore, we'll poll for any remaining data
    // and wait a max of .2 seconds.
    var numBytesRead: Int
    var pollTimeoutMs: Int = 200
    numBytesRead = ssh.channelPoll(channelNum, pollTimeoutMs: pollTimeoutMs).intValue
    // We're not checking for an error here.
    // A return value of -2 means that no data was available and the poll simply timed out (not an error)
    // A return value of -1 indicates an error.
    // A return value greater than 0 indicates that additional data was received.

    print("---- HTML BODY ----")

    // Extract the remainder of the accumulated data in the internal receive buffer.
    // This should be our HTML body:
    var htmlBody: String?
    htmlBody = ssh.getReceivedText(channelNum, charset: "ansi")
    print("\(htmlBody!)")

    // Close the channel:
    success = ssh.channelSendClose(channelNum)
    if success != true {
        print("\(ssh.lastErrorText!)")
        return
    }

    // Disconnect
    ssh.disconnect()

}