mirror of
https://github.com/net-byte/vtun
synced 2024-03-14 10:50:03 +08:00
105 lines
2.4 KiB
Go
105 lines
2.4 KiB
Go
package utls
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import (
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utls "github.com/refraction-networking/utls"
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"log"
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"net"
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"time"
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"github.com/golang/snappy"
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"github.com/net-byte/vtun/common/cache"
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"github.com/net-byte/vtun/common/cipher"
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"github.com/net-byte/vtun/common/config"
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"github.com/net-byte/vtun/common/counter"
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"github.com/net-byte/vtun/common/netutil"
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"github.com/net-byte/water"
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)
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// StartClient starts the tls client
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func StartClient(iface *water.Interface, config config.Config) {
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log.Println("vtun utls client started")
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go tunToTLS(config, iface)
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tlsconfig := &utls.Config{
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InsecureSkipVerify: config.TLSInsecureSkipVerify,
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}
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if config.TLSSni != "" {
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tlsconfig.ServerName = config.TLSSni
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}
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for {
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tcpConn, err := net.Dial("tcp", config.ServerAddr)
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if err != nil {
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time.Sleep(3 * time.Second)
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netutil.PrintErr(err, config.Verbose)
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continue
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}
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conn := utls.UClient(tcpConn, tlsconfig, utls.HelloRandomized)
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err = conn.Handshake()
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if err != nil {
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time.Sleep(3 * time.Second)
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netutil.PrintErr(err, config.Verbose)
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continue
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}
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cache.GetCache().Set("utlsconn", conn, 24*time.Hour)
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tlsToTun(config, conn, iface)
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cache.GetCache().Delete("utlsconn")
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}
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}
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// tunToTLS sends packets from tun to tls
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func tunToTLS(config config.Config, iface *water.Interface) {
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packet := make([]byte, config.BufferSize)
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for {
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n, err := iface.Read(packet)
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if err != nil {
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netutil.PrintErr(err, config.Verbose)
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break
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}
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if v, ok := cache.GetCache().Get("utlsconn"); ok {
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b := packet[:n]
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if config.Obfs {
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b = cipher.XOR(b)
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}
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if config.Compress {
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b = snappy.Encode(nil, b)
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}
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utlsconn := v.(*utls.UConn)
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_, err = utlsconn.Write(b)
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if err != nil {
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netutil.PrintErr(err, config.Verbose)
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continue
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}
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counter.IncrWrittenBytes(n)
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}
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}
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}
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// tlsToTun sends packets from tls to tun
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func tlsToTun(config config.Config, utlsconn *utls.UConn, iface *water.Interface) {
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defer utlsconn.Close()
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packet := make([]byte, config.BufferSize)
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for {
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n, err := utlsconn.Read(packet)
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if err != nil {
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netutil.PrintErr(err, config.Verbose)
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break
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}
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b := packet[:n]
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if config.Compress {
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b, err = snappy.Decode(nil, b)
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if err != nil {
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netutil.PrintErr(err, config.Verbose)
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break
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}
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}
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if config.Obfs {
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b = cipher.XOR(b)
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}
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_, err = iface.Write(b)
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if err != nil {
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netutil.PrintErr(err, config.Verbose)
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break
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}
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counter.IncrReadBytes(n)
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}
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}
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