Tunnel implementation, allow using ssh on connection screen

pkg/client/tunnel.go

@@ -6,12 +6,15 @@ import (
 	"io/ioutil"
 	"log"
 	"net"
+	"net/url"
 	"os"
+	"strings"
 	"sync"
 
 	"golang.org/x/crypto/ssh"
 
 	"github.com/sosedoff/pgweb/pkg/connection"
+	"github.com/sosedoff/pgweb/pkg/shared"
 )
 
 const (
@@ -22,21 +25,22 @@ const (
 type Tunnel struct {
 	TargetHost string
 	TargetPort string
-
-	SshHost     string
-	SshPort     string
-	SshUser     string
-	SshPassword string
-	SshKey      string
-
-	Config *ssh.ClientConfig
-	Client *ssh.Client
+	Port       int
+	SSHInfo    *shared.SSHInfo
+	Config     *ssh.ClientConfig
+	Client     *ssh.Client
+	Listener   *net.TCPListener
 }
 
 func privateKeyPath() string {
 	return os.Getenv("HOME") + "/.ssh/id_rsa"
 }
 
+func fileExists(path string) bool {
+	_, err := os.Stat(path)
+	return err == nil
+}
+
 func parsePrivateKey(keyPath string) (ssh.Signer, error) {
 	buff, err := ioutil.ReadFile(keyPath)
 	if err != nil {
@@ -46,10 +50,11 @@ func parsePrivateKey(keyPath string) (ssh.Signer, error) {
 	return ssh.ParsePrivateKey(buff)
 }
 
-func makeConfig(user, password, keyPath string) (*ssh.ClientConfig, error) {
+func makeConfig(info *shared.SSHInfo) (*ssh.ClientConfig, error) {
 	methods := []ssh.AuthMethod{}
 
-	if keyPath != "" {
+	keyPath := privateKeyPath()
+	if fileExists(keyPath) {
 		key, err := parsePrivateKey(keyPath)
 		if err != nil {
 			return nil, err
@@ -58,52 +63,19 @@ func makeConfig(user, password, keyPath string) (*ssh.ClientConfig, error) {
 		methods = append(methods, ssh.PublicKeys(key))
 	}
 
-	methods = append(methods, ssh.Password(password))
+	methods = append(methods, ssh.Password(info.Password))
 
-	return &ssh.ClientConfig{User: user, Auth: methods}, nil
+	return &ssh.ClientConfig{User: info.User, Auth: methods}, nil
 }
 
 func (tunnel *Tunnel) sshEndpoint() string {
-	return fmt.Sprintf("%s:%v", tunnel.SshHost, tunnel.SshPort)
+	return fmt.Sprintf("%s:%v", tunnel.SSHInfo.Host, tunnel.SSHInfo.Port)
 }
 
 func (tunnel *Tunnel) targetEndpoint() string {
 	return fmt.Sprintf("%v:%v", tunnel.TargetHost, tunnel.TargetPort)
 }
 
-func (tunnel *Tunnel) Start() error {
-	config, err := makeConfig(tunnel.SshUser, tunnel.SshPassword, tunnel.SshKey)
-	if err != nil {
-		return err
-	}
-
-	client, err := ssh.Dial("tcp", tunnel.sshEndpoint(), config)
-	if err != nil {
-		return err
-	}
-	defer client.Close()
-
-	port, err := connection.AvailablePort(PORT_START, PORT_LIMIT)
-	if err != nil {
-		return err
-	}
-
-	listener, err := net.Listen("tcp", fmt.Sprintf("127.0.0.1:%v", port))
-	if err != nil {
-		return err
-	}
-	defer listener.Close()
-
-	for {
-		conn, err := listener.Accept()
-		if err != nil {
-			return err
-		}
-
-		go tunnel.handleConnection(conn, client)
-	}
-}
-
 func (tunnel *Tunnel) copy(wg *sync.WaitGroup, writer, reader net.Conn) {
 	defer wg.Done()
 	if _, err := io.Copy(writer, reader); err != nil {
@@ -111,8 +83,8 @@ func (tunnel *Tunnel) copy(wg *sync.WaitGroup, writer, reader net.Conn) {
 	}
 }
 
-func (tunnel *Tunnel) handleConnection(local net.Conn, sshClient *ssh.Client) {
-	remote, err := sshClient.Dial("tcp", tunnel.targetEndpoint())
+func (tunnel *Tunnel) handleConnection(local net.Conn) {
+	remote, err := tunnel.Client.Dial("tcp", tunnel.targetEndpoint())
 	if err != nil {
 		return
 	}
@@ -124,4 +96,79 @@ func (tunnel *Tunnel) handleConnection(local net.Conn, sshClient *ssh.Client) {
 	go tunnel.copy(&wg, remote, local)
 
 	wg.Wait()
+	local.Close()
+}
+
+func (tunnel *Tunnel) Close() {
+	if tunnel.Client != nil {
+		tunnel.Client.Close()
+	}
+
+	if tunnel.Listener != nil {
+		tunnel.Listener.Close()
+	}
+}
+
+func (tunnel *Tunnel) Configure() error {
+	config, err := makeConfig(tunnel.SSHInfo)
+	if err != nil {
+		return err
+	}
+	tunnel.Config = config
+
+	client, err := ssh.Dial("tcp", tunnel.sshEndpoint(), config)
+	if err != nil {
+		return err
+	}
+	tunnel.Client = client
+
+	listener, err := net.Listen("tcp", fmt.Sprintf("127.0.0.1:%v", tunnel.Port))
+	if err != nil {
+		return err
+	}
+	tunnel.Listener = listener.(*net.TCPListener)
+
+	return nil
+}
+
+func (tunnel *Tunnel) Start() {
+	for {
+		conn, err := tunnel.Listener.Accept()
+		if err != nil {
+			return
+		}
+
+		go tunnel.handleConnection(conn)
+	}
+
+	tunnel.Close()
+}
+
+func NewTunnel(sshInfo *shared.SSHInfo, dbUrl string) (*Tunnel, error) {
+	uri, err := url.Parse(dbUrl)
+	if err != nil {
+		return nil, err
+	}
+
+	listenPort, err := connection.AvailablePort(PORT_START, PORT_LIMIT)
+	if err != nil {
+		return nil, err
+	}
+
+	chunks := strings.Split(uri.Host, ":")
+	host := chunks[0]
+	port := "5432"
+
+	if len(chunks) == 2 {
+		port = chunks[1]
+	}
+
+	tunnel := &Tunnel{
+		Port:       listenPort,
+		SSHInfo:    sshInfo,
+		TargetHost: host,
+		TargetPort: port,
+	}
+
+	return tunnel, nil
 }