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Copy pathgost.go
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216 lines (183 loc) · 5.28 KB
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package gost
import (
"crypto/rand"
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"errors"
"io"
"math/big"
"net"
"net/http"
"strings"
"sync"
"time"
"github.com/go-log/log"
)
// Version is the gost version.
const Version = "2.11.0"
// Debug is a flag that enables the debug log.
var Debug bool
var (
tinyBufferSize = 512
smallBufferSize = 2 * 1024 // 2KB small buffer
mediumBufferSize = 8 * 1024 // 8KB medium buffer
largeBufferSize = 32 * 1024 // 32KB large buffer
)
var (
sPool = sync.Pool{
New: func() interface{} {
return make([]byte, smallBufferSize)
},
}
mPool = sync.Pool{
New: func() interface{} {
return make([]byte, mediumBufferSize)
},
}
lPool = sync.Pool{
New: func() interface{} {
return make([]byte, largeBufferSize)
},
}
)
var (
// KeepAliveTime is the keep alive time period for TCP connection.
KeepAliveTime = 180 * time.Second
// DialTimeout is the timeout of dial.
DialTimeout = 5 * time.Second
// HandshakeTimeout is the timeout of handshake.
HandshakeTimeout = 5 * time.Second
// ConnectTimeout is the timeout for connect.
ConnectTimeout = 5 * time.Second
// ReadTimeout is the timeout for reading.
ReadTimeout = 10 * time.Second
// WriteTimeout is the timeout for writing.
WriteTimeout = 10 * time.Second
// PingTimeout is the timeout for pinging.
PingTimeout = 30 * time.Second
// PingRetries is the reties of ping.
PingRetries = 1
// default udp node TTL in second for udp port forwarding.
defaultTTL = 60 * time.Second
defaultBacklog = 128
defaultQueueSize = 128
)
var (
// DefaultTLSConfig is a default TLS config for internal use.
DefaultTLSConfig *tls.Config
// DefaultUserAgent is the default HTTP User-Agent header used by HTTP and websocket.
DefaultUserAgent = "Chrome/78.0.3904.106"
// DefaultMTU is the default mtu for tun/tap device
DefaultMTU = 1350
)
// SetLogger sets a new logger for internal log system.
func SetLogger(logger log.Logger) {
log.DefaultLogger = logger
}
// GenCertificate generates a random TLS certificate.
func GenCertificate() (cert tls.Certificate, err error) {
rawCert, rawKey, err := generateKeyPair()
if err != nil {
return
}
return tls.X509KeyPair(rawCert, rawKey)
}
func generateKeyPair() (rawCert, rawKey []byte, err error) {
// Create private key and self-signed certificate
// Adapted from https://golang.org/src/crypto/tls/generate_cert.go
priv, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
return
}
validFor := time.Hour * 24 * 365 * 10 // ten years
notBefore := time.Now()
notAfter := notBefore.Add(validFor)
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
template := x509.Certificate{
SerialNumber: serialNumber,
Subject: pkix.Name{
Organization: []string{"gost"},
},
NotBefore: notBefore,
NotAfter: notAfter,
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
BasicConstraintsValid: true,
}
derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, &priv.PublicKey, priv)
if err != nil {
return
}
rawCert = pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
rawKey = pem.EncodeToMemory(&pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(priv)})
return
}
type readWriter struct {
r io.Reader
w io.Writer
}
func (rw *readWriter) Read(p []byte) (n int, err error) {
return rw.r.Read(p)
}
func (rw *readWriter) Write(p []byte) (n int, err error) {
return rw.w.Write(p)
}
var (
nopClientConn = &nopConn{}
)
// a nop connection implements net.Conn,
// it does nothing.
type nopConn struct{}
func (c *nopConn) Read(b []byte) (n int, err error) {
return 0, &net.OpError{Op: "read", Net: "nop", Source: nil, Addr: nil, Err: errors.New("read not supported")}
}
func (c *nopConn) Write(b []byte) (n int, err error) {
return 0, &net.OpError{Op: "write", Net: "nop", Source: nil, Addr: nil, Err: errors.New("write not supported")}
}
func (c *nopConn) Close() error {
return nil
}
func (c *nopConn) LocalAddr() net.Addr {
return nil
}
func (c *nopConn) RemoteAddr() net.Addr {
return nil
}
func (c *nopConn) SetDeadline(t time.Time) error {
return &net.OpError{Op: "set", Net: "nop", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
}
func (c *nopConn) SetReadDeadline(t time.Time) error {
return &net.OpError{Op: "set", Net: "nop", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
}
func (c *nopConn) SetWriteDeadline(t time.Time) error {
return &net.OpError{Op: "set", Net: "nop", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
}
// splitLine splits a line text by white space, mainly used by config parser.
func splitLine(line string) []string {
if line == "" {
return nil
}
if n := strings.IndexByte(line, '#'); n >= 0 {
line = line[:n]
}
line = strings.Replace(line, "\t", " ", -1)
line = strings.TrimSpace(line)
var ss []string
for _, s := range strings.Split(line, " ") {
if s = strings.TrimSpace(s); s != "" {
ss = append(ss, s)
}
}
return ss
}
func connStateCallback(conn net.Conn, cs http.ConnState) {
switch cs {
case http.StateNew:
conn.SetReadDeadline(time.Now().Add(30 * time.Second))
default:
}
}