ssh -L 9000:localhost:9999 user@server.com

I have tried using this example as a starting point and this recent test to try to understand what to do, but now I have a pile of confusing jumbled code when it seems like this is actually a very simple thing to do.

Any help would be very much appreciated! :-)

I finally figured out how to do this, I got hints from schmichael in an IRC channel. Thanks to all!

net.Listenernet.Connnet.Conn
listener.Accept()io.Readerio.Writerio.Readerio.Writerio.Readerio.Writerio.Readerio.Writer

Here is the code:

package main

// Forward from local port 9000 to remote port 9999

import (
    "io"
    "log"
    "net"
    "golang.org/x/crypto/ssh"
)

var (
    username         = "root"
    password         = "password"
    serverAddrString = "192.168.1.100:22"
    localAddrString  = "localhost:9000"
    remoteAddrString = "localhost:9999"
)

func forward(localConn net.Conn, config *ssh.ClientConfig) {
    // Setup sshClientConn (type *ssh.ClientConn)
    sshClientConn, err := ssh.Dial("tcp", serverAddrString, config)
    if err != nil {
        log.Fatalf("ssh.Dial failed: %s", err)
    }

    // Setup sshConn (type net.Conn)
    sshConn, err := sshClientConn.Dial("tcp", remoteAddrString)

    // Copy localConn.Reader to sshConn.Writer
    go func() {
        _, err = io.Copy(sshConn, localConn)
        if err != nil {
            log.Fatalf("io.Copy failed: %v", err)
        }
    }()

    // Copy sshConn.Reader to localConn.Writer
    go func() {
        _, err = io.Copy(localConn, sshConn)
        if err != nil {
            log.Fatalf("io.Copy failed: %v", err)
        }
    }()
}

func main() {
    // Setup SSH config (type *ssh.ClientConfig)
    config := &ssh.ClientConfig{
        User: username,
        Auth: []ssh.AuthMethod{
            ssh.Password(password),
        },
    }

    // Setup localListener (type net.Listener)
    localListener, err := net.Listen("tcp", localAddrString)
    if err != nil {
        log.Fatalf("net.Listen failed: %v", err)
    }

    for {
        // Setup localConn (type net.Conn)
        localConn, err := localListener.Accept()
        if err != nil {
            log.Fatalf("listen.Accept failed: %v", err)
        }
        go forward(localConn, config)
    }
}

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