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dialer.go
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dialer.go
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package kcp
import (
"context"
"crypto/cipher"
"crypto/tls"
"net"
"sync"
"sync/atomic"
"v2ray.com/core/app/log"
"v2ray.com/core/common"
"v2ray.com/core/common/buf"
"v2ray.com/core/common/dice"
v2net "v2ray.com/core/common/net"
"v2ray.com/core/transport/internet"
v2tls "v2ray.com/core/transport/internet/tls"
)
var (
globalConv = uint32(dice.RollUint16())
)
type ClientConnection struct {
sync.RWMutex
net.Conn
input func([]Segment)
reader PacketReader
writer PacketWriter
}
func (c *ClientConnection) Overhead() int {
c.RLock()
defer c.RUnlock()
if c.writer == nil {
return 0
}
return c.writer.Overhead()
}
// Write implements io.Writer.
func (c *ClientConnection) Write(b []byte) (int, error) {
c.RLock()
defer c.RUnlock()
if c.writer == nil {
return len(b), nil
}
return c.writer.Write(b)
}
func (*ClientConnection) Read([]byte) (int, error) {
panic("KCP|ClientConnection: Read should not be called.")
}
func (c *ClientConnection) Close() error {
return c.Conn.Close()
}
func (c *ClientConnection) Reset(inputCallback func([]Segment)) {
c.Lock()
c.input = inputCallback
c.Unlock()
}
func (c *ClientConnection) ResetSecurity(header internet.PacketHeader, security cipher.AEAD) {
c.Lock()
if c.reader == nil {
c.reader = new(KCPPacketReader)
}
c.reader.(*KCPPacketReader).Header = header
c.reader.(*KCPPacketReader).Security = security
if c.writer == nil {
c.writer = new(KCPPacketWriter)
}
c.writer.(*KCPPacketWriter).Header = header
c.writer.(*KCPPacketWriter).Security = security
c.writer.(*KCPPacketWriter).Writer = c.Conn
c.Unlock()
}
func (c *ClientConnection) Run() {
payload := buf.New()
defer payload.Release()
for {
err := payload.Reset(buf.ReadFrom(c.Conn))
if err != nil {
payload.Release()
return
}
c.RLock()
if c.input != nil {
segments := c.reader.Read(payload.Bytes())
if len(segments) > 0 {
c.input(segments)
}
}
c.RUnlock()
}
}
func DialKCP(ctx context.Context, dest v2net.Destination) (internet.Connection, error) {
dest.Network = v2net.Network_UDP
log.Trace(newError("dialing mKCP to ", dest))
src := internet.DialerSourceFromContext(ctx)
rawConn, err := internet.DialSystem(ctx, src, dest)
if err != nil {
return nil, newError("failed to dial to dest: ", err).AtWarning().Base(err)
}
conn := &ClientConnection{
Conn: rawConn,
}
go conn.Run()
kcpSettings := internet.TransportSettingsFromContext(ctx).(*Config)
header, err := kcpSettings.GetPackerHeader()
if err != nil {
return nil, newError("failed to create packet header").Base(err)
}
security, err := kcpSettings.GetSecurity()
if err != nil {
return nil, newError("failed to create security").Base(err)
}
conn.ResetSecurity(header, security)
conv := uint16(atomic.AddUint32(&globalConv, 1))
session := NewConnection(conv, conn, kcpSettings)
var iConn internet.Connection
iConn = session
if securitySettings := internet.SecuritySettingsFromContext(ctx); securitySettings != nil {
switch securitySettings := securitySettings.(type) {
case *v2tls.Config:
config := securitySettings.GetTLSConfig()
if dest.Address.Family().IsDomain() {
config.ServerName = dest.Address.Domain()
}
tlsConn := tls.Client(iConn, config)
iConn = tlsConn
}
}
return iConn, nil
}
func init() {
common.Must(internet.RegisterTransportDialer(internet.TransportProtocol_MKCP, DialKCP))
}