Xray-core/proxy/shadowsocks_2022/inbound.go

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package shadowsocks_2022
import (
"context"
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shadowsocks "github.com/sagernet/sing-shadowsocks"
"github.com/sagernet/sing-shadowsocks/shadowaead_2022"
C "github.com/sagernet/sing/common"
B "github.com/sagernet/sing/common/buf"
"github.com/sagernet/sing/common/bufio"
E "github.com/sagernet/sing/common/exceptions"
M "github.com/sagernet/sing/common/metadata"
N "github.com/sagernet/sing/common/network"
"github.com/xtls/xray-core/common"
"github.com/xtls/xray-core/common/buf"
"github.com/xtls/xray-core/common/log"
"github.com/xtls/xray-core/common/net"
"github.com/xtls/xray-core/common/protocol"
"github.com/xtls/xray-core/common/session"
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"github.com/xtls/xray-core/common/singbridge"
"github.com/xtls/xray-core/features/routing"
"github.com/xtls/xray-core/transport/internet/stat"
)
func init() {
common.Must(common.RegisterConfig((*ServerConfig)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
return NewServer(ctx, config.(*ServerConfig))
}))
}
type Inbound struct {
networks []net.Network
service shadowsocks.Service
email string
level int
}
func NewServer(ctx context.Context, config *ServerConfig) (*Inbound, error) {
networks := config.Network
if len(networks) == 0 {
networks = []net.Network{
net.Network_TCP,
net.Network_UDP,
}
}
inbound := &Inbound{
networks: networks,
email: config.Email,
level: int(config.Level),
}
if !C.Contains(shadowaead_2022.List, config.Method) {
return nil, newError("unsupported method ", config.Method)
}
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service, err := shadowaead_2022.NewServiceWithPassword(config.Method, config.Key, 500, inbound, nil)
if err != nil {
return nil, newError("create service").Base(err)
}
inbound.service = service
return inbound, nil
}
func (i *Inbound) Network() []net.Network {
return i.networks
}
func (i *Inbound) Process(ctx context.Context, network net.Network, connection stat.Connection, dispatcher routing.Dispatcher) error {
inbound := session.InboundFromContext(ctx)
inbound.Name = "shadowsocks-2022"
inbound.CanSpliceCopy = 3
var metadata M.Metadata
if inbound.Source.IsValid() {
metadata.Source = M.ParseSocksaddr(inbound.Source.NetAddr())
}
ctx = session.ContextWithDispatcher(ctx, dispatcher)
if network == net.Network_TCP {
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return singbridge.ReturnError(i.service.NewConnection(ctx, connection, metadata))
} else {
reader := buf.NewReader(connection)
pc := &natPacketConn{connection}
for {
mb, err := reader.ReadMultiBuffer()
if err != nil {
buf.ReleaseMulti(mb)
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return singbridge.ReturnError(err)
}
for _, buffer := range mb {
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packet := B.As(buffer.Bytes()).ToOwned()
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buffer.Release()
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err = i.service.NewPacket(ctx, pc, packet, metadata)
if err != nil {
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packet.Release()
buf.ReleaseMulti(mb)
return err
}
}
}
}
}
func (i *Inbound) NewConnection(ctx context.Context, conn net.Conn, metadata M.Metadata) error {
inbound := session.InboundFromContext(ctx)
inbound.User = &protocol.MemoryUser{
Email: i.email,
Level: uint32(i.level),
}
ctx = log.ContextWithAccessMessage(ctx, &log.AccessMessage{
From: metadata.Source,
To: metadata.Destination,
Status: log.AccessAccepted,
Email: i.email,
})
newError("tunnelling request to tcp:", metadata.Destination).WriteToLog(session.ExportIDToError(ctx))
dispatcher := session.DispatcherFromContext(ctx)
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link, err := dispatcher.Dispatch(ctx, singbridge.ToDestination(metadata.Destination, net.Network_TCP))
if err != nil {
return err
}
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return singbridge.CopyConn(ctx, nil, link, conn)
}
func (i *Inbound) NewPacketConnection(ctx context.Context, conn N.PacketConn, metadata M.Metadata) error {
inbound := session.InboundFromContext(ctx)
inbound.User = &protocol.MemoryUser{
Email: i.email,
Level: uint32(i.level),
}
ctx = log.ContextWithAccessMessage(ctx, &log.AccessMessage{
From: metadata.Source,
To: metadata.Destination,
Status: log.AccessAccepted,
Email: i.email,
})
newError("tunnelling request to udp:", metadata.Destination).WriteToLog(session.ExportIDToError(ctx))
dispatcher := session.DispatcherFromContext(ctx)
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destination := singbridge.ToDestination(metadata.Destination, net.Network_UDP)
link, err := dispatcher.Dispatch(ctx, destination)
if err != nil {
return err
}
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outConn := &singbridge.PacketConnWrapper{
Reader: link.Reader,
Writer: link.Writer,
Dest: destination,
}
return bufio.CopyPacketConn(ctx, conn, outConn)
}
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func (i *Inbound) NewError(ctx context.Context, err error) {
if E.IsClosed(err) {
return
}
newError(err).AtWarning().WriteToLog()
}
type natPacketConn struct {
net.Conn
}
func (c *natPacketConn) ReadPacket(buffer *B.Buffer) (addr M.Socksaddr, err error) {
_, err = buffer.ReadFrom(c)
return
}
func (c *natPacketConn) WritePacket(buffer *B.Buffer, addr M.Socksaddr) error {
_, err := buffer.WriteTo(c)
return err
}