/
endpoint.go
440 lines (344 loc) · 8.38 KB
/
endpoint.go
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package common
import (
"context"
"crypto/tls"
"fmt"
"go.bug.st/serial"
"golang.org/x/crypto/sha3"
"io"
"net"
"strconv"
"strings"
"sync"
"time"
)
type Endpoint interface {
Start() error
Stop() error
}
type EndpointConnector func() (io.ReadWriteCloser, error)
func IsTTYDevice(device string) bool {
return len(device) > 0 && (strings.Contains(device, ",") || !strings.Contains(device, ":"))
}
func NewEndpoint(device string, isClient bool, tlsConfig *tls.Config) (Endpoint, EndpointConnector, error) {
var ep Endpoint
var connector EndpointConnector
if IsTTYDevice(device) {
tty, err := NewTTY(device)
if Error(err) {
return nil, nil, err
}
ep = tty
connector = func() (io.ReadWriteCloser, error) {
return tty.Connect()
}
return ep, connector, nil
} else {
if isClient {
networkClient, err := NewNetworkClient(device, tlsConfig)
if Error(err) {
return nil, nil, err
}
connector = func() (io.ReadWriteCloser, error) {
return networkClient.Connect()
}
ep = networkClient
} else {
networkServer, err := NewNetworkServer(device, tlsConfig)
if Error(err) {
return nil, nil, err
}
connector = func() (io.ReadWriteCloser, error) {
return networkServer.Connect()
}
ep = networkServer
}
return ep, connector, nil
}
}
type NetworkConnection struct {
Socket net.Conn
}
func (networkConnection *NetworkConnection) Read(p []byte) (n int, err error) {
return networkConnection.Socket.Read(p)
}
func (networkConnection *NetworkConnection) Write(p []byte) (n int, err error) {
return networkConnection.Socket.Write(p)
}
func (networkConnection *NetworkConnection) Close() error {
defer func() {
networkConnection.Socket = nil
}()
if networkConnection.Socket != nil {
err := networkConnection.Socket.Close()
if Error(err) {
return err
}
}
return nil
}
type NetworkClient struct {
address string
tlsConfig *tls.Config
}
func NewNetworkClient(address string, tlsConfig *tls.Config) (*NetworkClient, error) {
networkClient := &NetworkClient{
address: address,
tlsConfig: tlsConfig,
}
return networkClient, nil
}
func (networkClient *NetworkClient) Start() error {
return nil
}
func (networkClient *NetworkClient) Stop() error {
return nil
}
func (networkClient *NetworkClient) Connect() (*NetworkConnection, error) {
if networkClient.tlsConfig != nil {
Debug("Dial TLS connection: %s...", networkClient.address)
socket, err := tls.DialWithDialer(&net.Dialer{Deadline: time.Now().Add(MillisecondToDuration(*FlagIoConnectTimeout))}, "tcp", networkClient.address, networkClient.tlsConfig)
if Error(err) {
return nil, err
}
return &NetworkConnection{
Socket: socket,
}, nil
} else {
Debug("Dial connection: %s...", networkClient.address)
socket, err := net.DialTimeout("tcp", networkClient.address, MillisecondToDuration(*FlagIoConnectTimeout))
if Error(err) {
return nil, err
}
return &NetworkConnection{
Socket: socket,
}, nil
}
}
type NetworkServer struct {
mu sync.Mutex
address string
tlsConfig *tls.Config
listener net.Listener
}
func NewNetworkServer(address string, tlsConfig *tls.Config) (*NetworkServer, error) {
networkServer := &NetworkServer{
mu: sync.Mutex{},
address: address,
tlsConfig: tlsConfig,
listener: nil,
}
return networkServer, nil
}
func (networkServer *NetworkServer) Start() error {
networkServer.mu.Lock()
defer networkServer.mu.Unlock()
ips, err := GetHostInfos(true, false, nil)
if Error(err) {
return err
}
Debug("Local IPs: %v", ips)
if networkServer.tlsConfig != nil {
Debug("Create TLS listener: %s...", networkServer.address)
networkServer.listener, err = tls.Listen("tcp", networkServer.address, networkServer.tlsConfig)
if Error(err) {
return err
}
} else {
tcpAddr, err := net.ResolveTCPAddr("tcp", networkServer.address)
if Error(err) {
return err
}
Debug("Create listener: %s ...", networkServer.address)
networkServer.listener, err = net.ListenTCP("tcp", tcpAddr)
if Error(err) {
return err
}
}
return nil
}
func (networkServer *NetworkServer) Stop() error {
networkServer.mu.Lock()
defer networkServer.mu.Unlock()
defer func() {
//networkServer.listener = nil
}()
if networkServer.listener != nil {
err := networkServer.listener.Close()
if Error(err) {
return err
}
}
return nil
}
func (networkServer *NetworkServer) Connect() (*NetworkConnection, error) {
Debug("Accept connection ...")
socket, err := networkServer.listener.Accept()
if IsErrNetClosing(err) || DebugError(err) {
return nil, err
}
Debug("Connected: %s", socket.RemoteAddr().String())
return &NetworkConnection{
Socket: socket,
}, nil
}
func (this *NetworkServer) Serve() ([]byte, error) {
err := this.Start()
if Error(err) {
return nil, err
}
defer func() {
Error(this.Stop())
}()
w, err := this.Connect()
if Error(err) {
return nil, err
}
defer func() {
Error(w.Close())
}()
hash := sha3.New512()
_, err = io.Copy(hash, w)
return hash.Sum(nil), err
}
type TTYConnection struct {
port serial.Port
}
func (ttyConnection *TTYConnection) Read(p []byte) (n int, err error) {
return ttyConnection.port.Read(p)
}
func (ttyConnection *TTYConnection) Write(p []byte) (n int, err error) {
return ttyConnection.port.Write(p)
}
func (ttyConnection *TTYConnection) Close() error {
defer func() {
ttyConnection.port = nil
}()
if ttyConnection.port != nil {
err := ttyConnection.port.Close()
if Error(err) {
return err
}
time.Sleep(time.Millisecond * 200)
}
return nil
}
type TTY struct {
device string
}
func NewTTY(device string) (*TTY, error) {
tty := &TTY{
device: device,
}
tty.device = device
return tty, nil
}
func (tty *TTY) Start() error {
return nil
}
func (tty *TTY) Stop() error {
return nil
}
func (tty *TTY) Connect() (io.ReadWriteCloser, error) {
Debug("Connected: %s", tty.device)
serialPort, mode, err := evaluateTTYOptions(tty.device)
if Error(err) {
return nil, err
}
port, err := serial.Open(serialPort, mode)
if Error(err) {
return nil, err
}
err = port.ResetInputBuffer()
if Error(err) {
return nil, err
}
err = port.ResetOutputBuffer()
if Error(err) {
return nil, err
}
return &TTYConnection{
port: port,
}, nil
}
func evaluateTTYOptions(device string) (string, *serial.Mode, error) {
ss := strings.Split(device, ",")
baudrate := 9600
databits := 8
stopbits := serial.OneStopBit
paritymode := serial.NoParity
pm := "N"
sb := "1"
var portname string
var err error
portname = ss[0]
if len(ss) > 1 {
baudrate, err = strconv.Atoi(ss[1])
if err != nil || IndexOf([]string{"50", "75", "110", "134", "150", "200", "300", "600", "1200", "1800", "2400", "4800", "7200", "9600", "14400", "19200", "28800", "38400", "57600", "76800", "115200"}, ss[1]) == -1 {
err = fmt.Errorf("invalid baud rate: %s", ss[1])
}
if Error(nil) {
return "", nil, err
}
}
if len(ss) > 2 {
databits, err = strconv.Atoi(ss[2])
if err != nil {
err = fmt.Errorf("invalid databits: %s", ss[2])
if Error(nil) {
return "", nil, err
}
}
}
if len(ss) > 3 {
pm = strings.ToUpper(ss[3][:1])
switch pm {
case "N":
paritymode = serial.NoParity
case "O":
paritymode = serial.OddParity
case "E":
paritymode = serial.EvenParity
default:
err = fmt.Errorf("invalid partitymode: %s", pm)
if Error(nil) {
return "", nil, err
}
}
}
if len(ss) > 4 {
sb = strings.ToUpper(ss[4][:1])
switch sb {
case "1":
stopbits = serial.OneStopBit
case "1.5":
stopbits = serial.OnePointFiveStopBits
case "2":
stopbits = serial.TwoStopBits
default:
return "", nil, fmt.Errorf("invalid stopbits: %s", sb)
}
}
Debug("Use serial port %s: %d %d %s %s", portname, baudrate, databits, pm, sb)
return portname, &serial.Mode{
BaudRate: baudrate,
DataBits: databits,
Parity: paritymode,
StopBits: stopbits,
}, nil
}
func DataTransfer(ctx context.Context, cancel context.CancelFunc, leftName string, left io.ReadWriter, rightName string, right io.ReadWriter) {
DebugFunc("start")
go func() {
defer UnregisterGoRoutine(RegisterGoRoutine(1))
_, err := CopyBuffer(ctx, cancel, fmt.Sprintf("%s <- %s", leftName, rightName), left, right, 0)
DebugError(err)
}()
go func() {
defer UnregisterGoRoutine(RegisterGoRoutine(1))
_, err := CopyBuffer(ctx, cancel, fmt.Sprintf("%s -> %s", leftName, rightName), right, left, 0)
DebugError(err)
}()
<-ctx.Done()
DebugFunc("stop")
}