Xray-core/proxy/shadowsocks_2022/shadowsocks_2022.go

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//go:build go1.18
package shadowsocks_2022
import (
"io"
B "github.com/sagernet/sing/common/buf"
E "github.com/sagernet/sing/common/exceptions"
M "github.com/sagernet/sing/common/metadata"
"github.com/xtls/xray-core/common/buf"
"github.com/xtls/xray-core/common/net"
)
//go:generate go run github.com/xtls/xray-core/common/errors/errorgen
func toDestination(socksaddr M.Socksaddr, network net.Network) net.Destination {
if socksaddr.IsFqdn() {
return net.Destination{
Network: network,
Address: net.DomainAddress(socksaddr.Fqdn),
Port: net.Port(socksaddr.Port),
}
} else {
return net.Destination{
Network: network,
Address: net.IPAddress(socksaddr.Addr.AsSlice()),
Port: net.Port(socksaddr.Port),
}
}
}
func toSocksaddr(destination net.Destination) M.Socksaddr {
var addr M.Socksaddr
switch destination.Address.Family() {
case net.AddressFamilyDomain:
addr.Fqdn = destination.Address.Domain()
default:
addr.Addr = M.AddrFromIP(destination.Address.IP())
}
addr.Port = uint16(destination.Port)
return addr
}
type pipeConnWrapper struct {
R io.Reader
W buf.Writer
net.Conn
}
func (w *pipeConnWrapper) Close() error {
return nil
}
func (w *pipeConnWrapper) Read(b []byte) (n int, err error) {
return w.R.Read(b)
}
func (w *pipeConnWrapper) Write(p []byte) (n int, err error) {
n = len(p)
var mb buf.MultiBuffer
pLen := len(p)
for pLen > 0 {
buffer := buf.New()
if pLen > buf.Size {
_, err = buffer.Write(p[:buf.Size])
p = p[buf.Size:]
} else {
buffer.Write(p)
}
pLen -= int(buffer.Len())
mb = append(mb, buffer)
}
err = w.W.WriteMultiBuffer(mb)
if err != nil {
n = 0
buf.ReleaseMulti(mb)
}
return
}
type packetConnWrapper struct {
buf.Reader
buf.Writer
net.Conn
Dest net.Destination
cached buf.MultiBuffer
}
func (w *packetConnWrapper) ReadPacket(buffer *B.Buffer) (M.Socksaddr, error) {
if w.cached != nil {
mb, bb := buf.SplitFirst(w.cached)
if bb == nil {
w.cached = nil
} else {
buffer.Write(bb.Bytes())
w.cached = mb
var destination net.Destination
if bb.UDP != nil {
destination = *bb.UDP
} else {
destination = w.Dest
}
bb.Release()
return toSocksaddr(destination), nil
}
}
mb, err := w.ReadMultiBuffer()
if err != nil {
return M.Socksaddr{}, err
}
nb, bb := buf.SplitFirst(mb)
if bb == nil {
return M.Socksaddr{}, nil
} else {
buffer.Write(bb.Bytes())
w.cached = nb
var destination net.Destination
if bb.UDP != nil {
destination = *bb.UDP
} else {
destination = w.Dest
}
bb.Release()
return toSocksaddr(destination), nil
}
}
func (w *packetConnWrapper) WritePacket(buffer *B.Buffer, destination M.Socksaddr) error {
vBuf := buf.New()
vBuf.Write(buffer.Bytes())
endpoint := toDestination(destination, net.Network_UDP)
vBuf.UDP = &endpoint
return w.Writer.WriteMultiBuffer(buf.MultiBuffer{vBuf})
}
func (w *packetConnWrapper) Close() error {
buf.ReleaseMulti(w.cached)
return nil
}
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func returnError(err error) error {
if E.IsClosed(err) {
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return nil
}
return err
}