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server.go
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server.go
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package trojan
import (
"context"
"fmt"
"io"
"net"
"sync/atomic"
"github.com/faireal/trojan-go/api"
"github.com/faireal/trojan-go/common"
"github.com/faireal/trojan-go/config"
"github.com/faireal/trojan-go/log"
"github.com/faireal/trojan-go/redirector"
"github.com/faireal/trojan-go/statistic"
"github.com/faireal/trojan-go/statistic/memory"
"github.com/faireal/trojan-go/statistic/mysql"
"github.com/faireal/trojan-go/tunnel"
"github.com/faireal/trojan-go/tunnel/mux"
)
// InboundConn is a trojan inbound connection
type InboundConn struct {
// WARNING: do not change the order of these fields.
// 64-bit fields that use `sync/atomic` package functions
// must be 64-bit aligned on 32-bit systems.
// Reference: https://github.com/golang/go/issues/599
// Solution: https://github.com/golang/go/issues/11891#issuecomment-433623786
sent uint64
recv uint64
net.Conn
auth statistic.Authenticator
user statistic.User
hash string
metadata *tunnel.Metadata
ip string
}
func (c *InboundConn) Metadata() *tunnel.Metadata {
return c.metadata
}
func (c *InboundConn) Write(p []byte) (int, error) {
n, err := c.Conn.Write(p)
atomic.AddUint64(&c.sent, uint64(n))
c.user.AddTraffic(n, 0)
return n, err
}
func (c *InboundConn) Read(p []byte) (int, error) {
n, err := c.Conn.Read(p)
atomic.AddUint64(&c.recv, uint64(n))
c.user.AddTraffic(0, n)
return n, err
}
func (c *InboundConn) Close() error {
log.Info("user", c.hash, "from", c.Conn.RemoteAddr(), "tunneling to", c.metadata.Address, "closed",
"sent:", common.HumanFriendlyTraffic(atomic.LoadUint64(&c.sent)), "recv:", common.HumanFriendlyTraffic(atomic.LoadUint64(&c.recv)))
c.user.DelIP(c.ip)
return c.Conn.Close()
}
func (c *InboundConn) Auth() error {
userHash := [56]byte{}
n, err := c.Conn.Read(userHash[:])
if err != nil || n != 56 {
return common.NewError("failed to read hash").Base(err)
}
valid, user := c.auth.AuthUser(string(userHash[:]))
if !valid {
return common.NewError("invalid hash:" + string(userHash[:]))
}
c.hash = string(userHash[:])
c.user = user
ip, _, err := net.SplitHostPort(c.Conn.RemoteAddr().String())
if err != nil {
return common.NewError("failed to parse host:" + c.Conn.RemoteAddr().String()).Base(err)
}
c.ip = ip
ok := user.AddIP(ip)
if !ok {
return common.NewError("ip limit reached")
}
crlf := [2]byte{}
_, err = io.ReadFull(c.Conn, crlf[:])
if err != nil {
return err
}
c.metadata = &tunnel.Metadata{}
if err := c.metadata.ReadFrom(c.Conn); err != nil {
return err
}
_, err = io.ReadFull(c.Conn, crlf[:])
if err != nil {
return err
}
return nil
}
// Server is a trojan tunnel server
type Server struct {
auth statistic.Authenticator
redir *redirector.Redirector
redirAddr *tunnel.Address
underlay tunnel.Server
connChan chan tunnel.Conn
muxChan chan tunnel.Conn
packetChan chan tunnel.PacketConn
ctx context.Context
cancel context.CancelFunc
}
func (s *Server) Close() error {
s.cancel()
return s.underlay.Close()
}
func (s *Server) acceptLoop() {
for {
conn, err := s.underlay.AcceptConn(&Tunnel{})
if err != nil { // Closing
log.Error(common.NewError("trojan failed to accept conn").Base(err))
select {
case <-s.ctx.Done():
return
default:
}
continue
}
go func(conn tunnel.Conn) {
rewindConn := common.NewRewindConn(conn)
rewindConn.SetBufferSize(128)
defer rewindConn.StopBuffering()
inboundConn := &InboundConn{
Conn: rewindConn,
auth: s.auth,
}
if err := inboundConn.Auth(); err != nil {
rewindConn.Rewind()
rewindConn.StopBuffering()
log.Warn(common.NewError("connection with invalid trojan header from " + rewindConn.RemoteAddr().String()).Base(err))
s.redir.Redirect(&redirector.Redirection{
RedirectTo: s.redirAddr,
InboundConn: rewindConn,
})
return
}
rewindConn.StopBuffering()
switch inboundConn.metadata.Command {
case Connect:
if inboundConn.metadata.DomainName == "MUX_CONN" {
s.muxChan <- inboundConn
log.Debug("mux(r) connection")
} else {
s.connChan <- inboundConn
log.Debug("normal trojan connection")
}
case Associate:
s.packetChan <- &PacketConn{
Conn: inboundConn,
}
log.Debug("trojan udp connection")
case Mux:
s.muxChan <- inboundConn
log.Debug("mux connection")
default:
log.Error(common.NewError(fmt.Sprintf("unknown trojan command %d", inboundConn.metadata.Command)))
}
}(conn)
}
}
func (s *Server) AcceptConn(nextTunnel tunnel.Tunnel) (tunnel.Conn, error) {
switch nextTunnel.(type) {
case *mux.Tunnel:
select {
case t := <-s.muxChan:
return t, nil
case <-s.ctx.Done():
return nil, common.NewError("trojan client closed")
}
default:
select {
case t := <-s.connChan:
return t, nil
case <-s.ctx.Done():
return nil, common.NewError("trojan client closed")
}
}
}
func (s *Server) AcceptPacket(tunnel.Tunnel) (tunnel.PacketConn, error) {
select {
case t := <-s.packetChan:
return t, nil
case <-s.ctx.Done():
return nil, common.NewError("trojan client closed")
}
}
func NewServer(ctx context.Context, underlay tunnel.Server) (*Server, error) {
cfg := config.FromContext(ctx, Name).(*Config)
ctx, cancel := context.WithCancel(ctx)
// TODO replace this dirty code
var auth statistic.Authenticator
var err error
if cfg.MySQL.Enabled {
log.Debug("mysql enabled")
auth, err = statistic.NewAuthenticator(ctx, mysql.Name)
} else {
log.Debug("auth by config file")
auth, err = statistic.NewAuthenticator(ctx, memory.Name)
}
if err != nil {
cancel()
return nil, common.NewError("trojan failed to create authenticator")
}
if cfg.API.Enabled {
go api.RunService(ctx, Name+"_SERVER", auth)
}
redirAddr := tunnel.NewAddressFromHostPort("tcp", cfg.RemoteHost, cfg.RemotePort)
s := &Server{
underlay: underlay,
auth: auth,
redirAddr: redirAddr,
connChan: make(chan tunnel.Conn, 32),
muxChan: make(chan tunnel.Conn, 32),
packetChan: make(chan tunnel.PacketConn, 32),
ctx: ctx,
cancel: cancel,
redir: redirector.NewRedirector(ctx),
}
if !cfg.DisableHTTPCheck {
redirConn, err := net.Dial("tcp", redirAddr.String())
if err != nil {
cancel()
return nil, common.NewError("invalid redirect address. check your http server: " + redirAddr.String()).Base(err)
}
redirConn.Close()
}
go s.acceptLoop()
log.Debug("trojan server created")
return s, nil
}