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tls.go
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tls.go
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package tls
import (
stdtls "crypto/tls"
"errors"
"net"
"net/url"
"strings"
"github.com/nadoo/glider/common/log"
"github.com/nadoo/glider/proxy"
)
// TLS struct
type TLS struct {
dialer proxy.Dialer
addr string
tlsConfig *stdtls.Config
serverName string
skipVerify bool
certFile string
keyFile string
cert stdtls.Certificate
server proxy.Server
}
func init() {
proxy.RegisterDialer("tls", NewTLSDialer)
proxy.RegisterServer("tls", NewTLSServer)
}
// NewTLS returns a tls proxy struct
func NewTLS(s string, dialer proxy.Dialer) (*TLS, error) {
u, err := url.Parse(s)
if err != nil {
log.F("parse url err: %s", err)
return nil, err
}
addr := u.Host
colonPos := strings.LastIndex(addr, ":")
if colonPos == -1 {
colonPos = len(addr)
}
serverName := addr[:colonPos]
query := u.Query()
skipVerify := query.Get("skipVerify")
certFile := query.Get("cert")
keyFile := query.Get("key")
p := &TLS{
dialer: dialer,
addr: addr,
serverName: serverName,
skipVerify: false,
certFile: certFile,
keyFile: keyFile,
}
if skipVerify == "true" {
p.skipVerify = true
}
return p, nil
}
// NewTLSDialer returns a tls proxy dialer
func NewTLSDialer(s string, dialer proxy.Dialer) (proxy.Dialer, error) {
p, err := NewTLS(s, dialer)
if err != nil {
return nil, err
}
p.tlsConfig = &stdtls.Config{
ServerName: p.serverName,
InsecureSkipVerify: p.skipVerify,
ClientSessionCache: stdtls.NewLRUClientSessionCache(64),
MinVersion: stdtls.VersionTLS10,
}
return p, err
}
// NewTLSServer returns a tls transport layer before the real server
func NewTLSServer(s string, dialer proxy.Dialer) (proxy.Server, error) {
transport := strings.Split(s, ",")
// prepare transport listener
// TODO: check here
if len(transport) < 2 {
return nil, errors.New("[tls] malformd listener:" + s)
}
p, err := NewTLS(transport[0], dialer)
if err != nil {
return nil, err
}
cert, err := stdtls.LoadX509KeyPair(p.certFile, p.keyFile)
if err != nil {
log.F("[tls] unable to load cert: %s, key %s", p.certFile, p.keyFile)
return nil, err
}
p.tlsConfig = &stdtls.Config{
Certificates: []stdtls.Certificate{cert},
MinVersion: stdtls.VersionTLS10,
}
p.server, err = proxy.ServerFromURL(transport[1], dialer)
if err != nil {
return nil, err
}
return p, nil
}
// ListenAndServe .
func (s *TLS) ListenAndServe() {
l, err := net.Listen("tcp", s.addr)
if err != nil {
log.F("[tls] failed to listen on %s: %v", s.addr, err)
return
}
defer l.Close()
log.F("[tls] listening TCP on %s with TLS", s.addr)
for {
c, err := l.Accept()
if err != nil {
log.F("[tls] failed to accept: %v", err)
continue
}
go s.Serve(c)
}
}
// Serve serves requests
func (s *TLS) Serve(c net.Conn) {
// we know the internal server will close the connection after serve
// defer c.Close()
if s.server != nil {
cc := stdtls.Server(c, s.tlsConfig)
s.server.Serve(cc)
}
}
// Addr returns forwarder's address
func (s *TLS) Addr() string { return s.addr }
// NextDialer returns the next dialer
func (s *TLS) NextDialer(dstAddr string) proxy.Dialer { return s.dialer.NextDialer(dstAddr) }
// Dial connects to the address addr on the network net via the proxy
func (s *TLS) Dial(network, addr string) (net.Conn, error) {
cc, err := s.dialer.Dial("tcp", s.addr)
if err != nil {
log.F("[tls] dial to %s error: %s", s.addr, err)
return nil, err
}
c := stdtls.Client(cc, s.tlsConfig)
err = c.Handshake()
return c, err
}
// DialUDP connects to the given address via the proxy
func (s *TLS) DialUDP(network, addr string) (net.PacketConn, net.Addr, error) {
return nil, nil, errors.New("tls client does not support udp now")
}