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conn.go
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conn.go
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// protocol spec:
// https://trojan-gfw.github.io/trojan/protocol
package trojanc
import (
"bytes"
"encoding/binary"
"fmt"
"io"
"net"
"net/netip"
"strconv"
"sync"
"time"
"github.com/daeuniverse/softwind/netproxy"
"github.com/daeuniverse/softwind/pool"
"github.com/daeuniverse/softwind/protocol/vmess"
)
var (
FailAuthErr = fmt.Errorf("incorrect UUID")
)
type Conn struct {
netproxy.Conn
metadata vmess.Metadata
cmdKey []byte
cachedProxyAddrIpIP netip.AddrPort
writeMutex sync.Mutex
onceWrite bool
onceRead sync.Once
}
func NewConn(conn netproxy.Conn, metadata vmess.Metadata, cmdKey []byte) (c *Conn, err error) {
// DO NOT use pool here because Close() cannot interrupt the reading or writing, which will modify the value of the pool buffer.
key := make([]byte, len(cmdKey))
copy(key, cmdKey)
c = &Conn{
Conn: conn,
metadata: metadata,
cmdKey: key,
}
if metadata.Network == "udp" {
proxyAddrIp, err := net.ResolveUDPAddr("udp", net.JoinHostPort(c.metadata.Hostname, strconv.Itoa(int(c.metadata.Port))))
if err != nil {
return nil, err
}
c.cachedProxyAddrIpIP = proxyAddrIp.AddrPort()
}
if metadata.Network == "tcp" && metadata.IsClient {
time.AfterFunc(100*time.Millisecond, func() {
// avoid the situation where the server sends messages first
if _, err = c.Write(nil); err != nil {
return
}
})
}
return c, nil
}
func (c *Conn) reqHeaderFromPool(payload []byte) (buf []byte) {
addrLen := c.metadata.AddrLen()
buf = pool.Get(1 + 16 + 1 + 1 + 2 + 1 + addrLen + len(payload))
buf[0] = 0 // version
copy(buf[1:], c.cmdKey)
buf[17] = 0 // length of addons
buf[18] = vmess.NetworkToByte(c.metadata.Network) // inst
binary.BigEndian.PutUint16(buf[19:], c.metadata.Port) // port
buf[21] = vmess.MetadataTypeToByte(c.metadata.Type) // addr type
c.metadata.PutAddr(buf[22:])
copy(buf[22+addrLen:], payload)
return buf
}
func (c *Conn) Write(b []byte) (n int, err error) {
c.writeMutex.Lock()
defer c.writeMutex.Unlock()
if !c.onceWrite {
if c.metadata.IsClient {
buf := c.reqHeaderFromPool(b)
defer pool.Put(buf)
if _, err = c.Conn.Write(buf); err != nil {
return 0, fmt.Errorf("write header: %w", err)
}
c.onceWrite = true
return len(b), nil
}
}
return c.Conn.Write(b)
}
func (c *Conn) Read(b []byte) (n int, err error) {
c.onceRead.Do(func() {
if c.metadata.IsClient {
if err = c.ReadRespHeader(); err != nil {
return
}
} else {
if err = c.ReadReqHeader(); err != nil {
return
}
}
})
if err != nil {
return 0, err
}
return c.Conn.Read(b)
}
func (c *Conn) ReadReqHeader() (err error) {
buf := pool.Get(18)
defer pool.Put(buf)
if _, err = io.ReadFull(c.Conn, buf); err != nil {
return err
}
if buf[0] != 0 {
return fmt.Errorf("version %v is not supprted", buf[0])
}
if !bytes.Equal(c.cmdKey[:], buf[1:17]) {
return FailAuthErr
}
if _, err = io.CopyN(io.Discard, c.Conn, int64(buf[17])); err != nil { // ignore addons
return err
}
buf = pool.Get(4)
defer pool.Put(buf)
if _, err = io.ReadFull(c.Conn, buf); err != nil {
return err
}
if err = CompleteMetadataFromReader(&c.metadata, buf, c.Conn); err != nil {
return err
}
return nil
}
func (c *Conn) ReadRespHeader() (err error) {
buf := pool.Get(2)
defer pool.Put(buf)
if _, err = io.ReadFull(c.Conn, buf); err != nil {
return err
}
if buf[0] != 0 {
return fmt.Errorf("version %v is not supprted", buf[0])
}
if _, err = io.CopyN(io.Discard, c.Conn, int64(buf[1])); err != nil {
return err
}
return nil
}