/
kcp.go
268 lines (224 loc) · 5.56 KB
/
kcp.go
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package kcp
import (
"crypto/sha1"
"errors"
"fmt"
"net"
"net/url"
"strconv"
"strings"
kcp "github.com/xtaci/kcp-go/v5"
"golang.org/x/crypto/pbkdf2"
"github.com/nadoo/glider/log"
"github.com/nadoo/glider/proxy"
)
// KCP struct.
type KCP struct {
dialer proxy.Dialer
proxy proxy.Proxy
addr string
key string
crypt string
block kcp.BlockCrypt
mode string
dataShards int
parityShards int
server proxy.Server
}
func init() {
proxy.RegisterDialer("kcp", NewKCPDialer)
proxy.RegisterServer("kcp", NewKCPServer)
}
// NewKCP returns a kcp proxy struct.
func NewKCP(s string, d proxy.Dialer, p proxy.Proxy) (*KCP, error) {
u, err := url.Parse(s)
if err != nil {
log.F("[kcp] parse url err: %s", err)
return nil, err
}
addr := u.Host
crypt := u.User.Username()
key, _ := u.User.Password()
query := u.Query()
// dataShards
dShards := query.Get("dataShards")
if dShards == "" {
dShards = "10"
}
dataShards, err := strconv.ParseUint(dShards, 10, 32)
if err != nil {
log.F("[kcp] parse dataShards err: %s", err)
return nil, err
}
// parityShards
pShards := query.Get("parityShards")
if pShards == "" {
pShards = "3"
}
parityShards, err := strconv.ParseUint(pShards, 10, 32)
if err != nil {
log.F("[kcp] parse parityShards err: %s", err)
return nil, err
}
k := &KCP{
dialer: d,
proxy: p,
addr: addr,
key: key,
crypt: crypt,
mode: query.Get("mode"),
dataShards: int(dataShards),
parityShards: int(parityShards),
}
if k.crypt != "" {
k.block, err = block(k.crypt, k.key)
if err != nil {
return nil, fmt.Errorf("[kcp] error: %s", err)
}
}
if k.mode == "" {
k.mode = "fast"
}
return k, nil
}
func block(crypt, key string) (block kcp.BlockCrypt, err error) {
pass := pbkdf2.Key([]byte(key), []byte("kcp-go"), 4096, 32, sha1.New)
switch crypt {
case "sm4":
block, _ = kcp.NewSM4BlockCrypt(pass[:16])
case "tea":
block, _ = kcp.NewTEABlockCrypt(pass[:16])
case "xor":
block, _ = kcp.NewSimpleXORBlockCrypt(pass)
case "none":
block, _ = kcp.NewNoneBlockCrypt(pass)
case "aes":
block, _ = kcp.NewAESBlockCrypt(pass)
case "aes-128":
block, _ = kcp.NewAESBlockCrypt(pass[:16])
case "aes-192":
block, _ = kcp.NewAESBlockCrypt(pass[:24])
case "blowfish":
block, _ = kcp.NewBlowfishBlockCrypt(pass)
case "twofish":
block, _ = kcp.NewTwofishBlockCrypt(pass)
case "cast5":
block, _ = kcp.NewCast5BlockCrypt(pass[:16])
case "3des":
block, _ = kcp.NewTripleDESBlockCrypt(pass[:24])
case "xtea":
block, _ = kcp.NewXTEABlockCrypt(pass[:16])
case "salsa20":
block, _ = kcp.NewSalsa20BlockCrypt(pass)
default:
err = errors.New("unknown crypt type '" + crypt + "'")
}
return block, err
}
// NewKCPDialer returns a kcp proxy dialer.
func NewKCPDialer(s string, d proxy.Dialer) (proxy.Dialer, error) {
return NewKCP(s, d, nil)
}
// NewKCPServer returns a kcp proxy server.
func NewKCPServer(s string, p proxy.Proxy) (proxy.Server, error) {
schemes := strings.SplitN(s, ",", 2)
k, err := NewKCP(schemes[0], nil, p)
if err != nil {
return nil, err
}
if len(schemes) > 1 {
k.server, err = proxy.ServerFromURL(schemes[1], p)
if err != nil {
return nil, err
}
}
return k, nil
}
// ListenAndServe listens on server's addr and serves connections.
func (s *KCP) ListenAndServe() {
l, err := kcp.ListenWithOptions(s.addr, s.block, s.dataShards, s.parityShards)
if err != nil {
log.F("[kcp] failed to listen on %s: %v", s.addr, err)
return
}
defer l.Close()
log.F("[kcp] listening on %s", s.addr)
for {
c, err := l.AcceptKCP()
if err != nil {
log.F("[kcp] failed to accept: %v", err)
continue
}
s.setParams(c)
go s.Serve(c)
}
}
// Serve serves connections.
func (s *KCP) Serve(c net.Conn) {
if s.server != nil {
s.server.Serve(c)
return
}
defer c.Close()
rc, dialer, err := s.proxy.Dial("tcp", "")
if err != nil {
log.F("[kcp] %s <-> %s via %s, error in dial: %v", c.RemoteAddr(), s.addr, dialer.Addr(), err)
s.proxy.Record(dialer, false)
return
}
defer rc.Close()
log.F("[kcp] %s <-> %s", c.RemoteAddr(), dialer.Addr())
if err = proxy.Relay(c, rc); err != nil {
log.F("[kcp] %s <-> %s, relay error: %v", c.RemoteAddr(), dialer.Addr(), err)
// record remote conn failure only
if !strings.Contains(err.Error(), s.addr) {
s.proxy.Record(dialer, false)
}
}
}
// Addr returns forwarder's address.
func (s *KCP) Addr() string {
if s.addr == "" {
return s.dialer.Addr()
}
return s.addr
}
// Dial connects to the address addr on the network net via the proxy.
func (s *KCP) Dial(network, addr string) (net.Conn, error) {
// NOTE: kcp uses udp, we should dial remote server directly here
c, err := kcp.DialWithOptions(s.addr, s.block, s.dataShards, s.parityShards)
if err != nil {
log.F("[kcp] dial to %s error: %s", s.addr, err)
return nil, err
}
s.setParams(c)
c.SetDSCP(0)
c.SetReadBuffer(4194304)
c.SetWriteBuffer(4194304)
return c, err
}
// DialUDP connects to the given address via the proxy.
func (s *KCP) DialUDP(network, addr string) (net.PacketConn, net.Addr, error) {
return nil, nil, proxy.ErrNotSupported
}
func (s *KCP) setParams(c *kcp.UDPSession) {
// TODO: change them to customizable later?
c.SetStreamMode(true)
c.SetWriteDelay(false)
switch s.mode {
case "normal":
c.SetNoDelay(0, 40, 2, 1)
case "fast":
c.SetNoDelay(0, 30, 2, 1)
case "fast2":
c.SetNoDelay(1, 20, 2, 1)
case "fast3":
c.SetNoDelay(1, 10, 2, 1)
default:
log.F("[kcp] unkonw mode: %s, use fast mode instead", s.mode)
c.SetNoDelay(0, 30, 2, 1)
}
c.SetWindowSize(1024, 1024)
c.SetMtu(1350)
c.SetACKNoDelay(true)
}