go-gost/gost
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

add bind for relay

Browse Source
This commit is contained in:
ginuerzh
2021-11-23 23:23:16 +08:00
parent 7beb5bf6d7
commit 98ef6c7492
18 changed files with 391 additions and 201 deletions
Download Patch File Download Diff File Expand all files Collapse all files

259
pkg/handler/relay/bind.go Normal file
View File

@ -0,0 +1,259 @@
package relay
import (
"context"
"fmt"
"net"
"time"
"github.com/go-gost/gost/pkg/common/bufpool"
"github.com/go-gost/gost/pkg/common/util/mux"
"github.com/go-gost/gost/pkg/common/util/socks"
"github.com/go-gost/gost/pkg/handler"
"github.com/go-gost/relay"
)
func (h *relayHandler) handleBind(ctx context.Context, conn net.Conn, network, address string) {
h.logger = h.logger.WithFields(map[string]interface{}{
"dst": fmt.Sprintf("%s/%s", address, network),
"cmd": "bind",
})
h.logger.Infof("%s >> %s", conn.RemoteAddr(), address)
resp := relay.Response{
Version: relay.Version1,
Status: relay.StatusOK,
}
if !h.md.enableBind {
resp.Status = relay.StatusForbidden
resp.WriteTo(conn)
h.logger.Error("BIND is diabled")
return
}
if network == "tcp" {
h.bindTCP(ctx, conn, network, address)
} else {
h.bindUDP(ctx, conn, network, address)
}
}
func (h *relayHandler) bindTCP(ctx context.Context, conn net.Conn, network, address string) {
resp := relay.Response{
Version: relay.Version1,
Status: relay.StatusOK,
}
ln, err := net.Listen(network, address) // strict mode: if the port already in use, it will return error
if err != nil {
h.logger.Error(err)
resp.Status = relay.StatusServiceUnavailable
resp.WriteTo(conn)
return
}
af := &relay.AddrFeature{}
err = af.ParseFrom(ln.Addr().String())
if err != nil {
h.logger.Warn(err)
}
// Issue: may not reachable when host has multi-interface
af.Host, _, _ = net.SplitHostPort(conn.LocalAddr().String())
af.AType = relay.AddrIPv4
resp.Features = append(resp.Features, af)
if _, err := resp.WriteTo(conn); err != nil {
h.logger.Error(err)
ln.Close()
return
}
h.logger = h.logger.WithFields(map[string]interface{}{
"bind": fmt.Sprintf("%s/%s", ln.Addr(), ln.Addr().Network()),
})
h.logger.Debugf("bind on %s OK", ln.Addr())
h.serveTCPBind(ctx, conn, ln)
}
func (h *relayHandler) bindUDP(ctx context.Context, conn net.Conn, network, address string) {
resp := relay.Response{
Version: relay.Version1,
Status: relay.StatusOK,
}
bindAddr, _ := net.ResolveUDPAddr(network, address)
pc, err := net.ListenUDP(network, bindAddr)
if err != nil {
h.logger.Error(err)
return
}
defer pc.Close()
af := &relay.AddrFeature{}
err = af.ParseFrom(pc.LocalAddr().String())
if err != nil {
h.logger.Warn(err)
}
// Issue: may not reachable when host has multi-interface
af.Host, _, _ = net.SplitHostPort(conn.LocalAddr().String())
af.AType = relay.AddrIPv4
resp.Features = append(resp.Features, af)
if _, err := resp.WriteTo(conn); err != nil {
h.logger.Error(err)
return
}
h.logger = h.logger.WithFields(map[string]interface{}{
"bind": pc.LocalAddr().String(),
})
h.logger.Debugf("bind on %s OK", pc.LocalAddr())
t := time.Now()
h.logger.Infof("%s <-> %s", conn.RemoteAddr(), pc.LocalAddr())
h.tunnelServerUDP(
socks.UDPTunServerConn(conn),
pc,
)
h.logger.
WithFields(map[string]interface{}{
"duration": time.Since(t),
}).
Infof("%s >-< %s", conn.RemoteAddr(), pc.LocalAddr())
}
func (h *relayHandler) serveTCPBind(ctx context.Context, conn net.Conn, ln net.Listener) {
// Upgrade connection to multiplex stream.
session, err := mux.ClientSession(conn)
if err != nil {
h.logger.Error(err)
return
}
defer session.Close()
go func() {
defer ln.Close()
for {
conn, err := session.Accept()
if err != nil {
h.logger.Error(err)
return
}
conn.Close() // we do not handle incoming connections.
}
}()
for {
rc, err := ln.Accept()
if err != nil {
h.logger.Error(err)
return
}
h.logger.Debugf("peer %s accepted", rc.RemoteAddr())
go func(c net.Conn) {
defer c.Close()
sc, err := session.GetConn()
if err != nil {
h.logger.Error(err)
return
}
defer sc.Close()
af := &relay.AddrFeature{}
af.ParseFrom(c.RemoteAddr().String())
resp := relay.Response{
Version: relay.Version1,
Status: relay.StatusOK,
Features: []relay.Feature{af},
}
if _, err := resp.WriteTo(sc); err != nil {
h.logger.Error(err)
return
}
t := time.Now()
h.logger.Infof("%s <-> %s", conn.RemoteAddr(), c.RemoteAddr().String())
handler.Transport(sc, c)
h.logger.
WithFields(map[string]interface{}{"duration": time.Since(t)}).
Infof("%s >-< %s", conn.RemoteAddr(), c.RemoteAddr().String())
}(rc)
}
}
func (h *relayHandler) tunnelServerUDP(tunnel, c net.PacketConn) (err error) {
bufSize := h.md.udpBufferSize
errc := make(chan error, 2)
go func() {
for {
err := func() error {
b := bufpool.Get(bufSize)
defer bufpool.Put(b)
n, raddr, err := tunnel.ReadFrom(b)
if err != nil {
return err
}
if h.bypass != nil && h.bypass.Contains(raddr.String()) {
h.logger.Warn("bypass: ", raddr)
return nil
}
if _, err := c.WriteTo(b[:n], raddr); err != nil {
return err
}
h.logger.Debugf("%s >>> %s data: %d",
c.LocalAddr(), raddr, n)
return nil
}()
if err != nil {
errc <- err
return
}
}
}()
go func() {
for {
err := func() error {
b := bufpool.Get(bufSize)
defer bufpool.Put(b)
n, raddr, err := c.ReadFrom(b)
if err != nil {
return err
}
if h.bypass != nil && h.bypass.Contains(raddr.String()) {
h.logger.Warn("bypass: ", raddr)
return nil
}
if _, err := tunnel.WriteTo(b[:n], raddr); err != nil {
return err
}
h.logger.Debugf("%s <<< %s data: %d",
c.LocalAddr(), raddr, n)
return nil
}()
if err != nil {
errc <- err
return
}
}
}()
return <-errc
}

15
pkg/handler/relay/proxy.go → pkg/handler/relay/connect.go
View File

@ -2,6 +2,7 @@ package relay
import (
"context"
"fmt"
"net"
"time"
@ -11,7 +12,12 @@ import (
"github.com/go-gost/relay"
)
func (h *relayHandler) handleProxy(ctx context.Context, conn net.Conn, network, address string) {
func (h *relayHandler) handleConnect(ctx context.Context, conn net.Conn, network, address string) {
h.logger = h.logger.WithFields(map[string]interface{}{
"dst": fmt.Sprintf("%s/%s", address, network),
"cmd": "connect",
})
h.logger.Infof("%s >> %s", conn.RemoteAddr(), address)
resp := relay.Response{
@ -19,6 +25,13 @@ func (h *relayHandler) handleProxy(ctx context.Context, conn net.Conn, network,
Status: relay.StatusOK,
}
if address == "" {
resp.Status = relay.StatusBadRequest
resp.WriteTo(conn)
h.logger.Error("target not specified")
return
}
if h.bypass != nil && h.bypass.Contains(address) {
h.logger.Info("bypass: ", address)
resp.Status = relay.StatusForbidden

3
pkg/handler/relay/forward.go
View File

@ -2,6 +2,7 @@ package relay
import (
"context"
"fmt"
"net"
"time"
@ -17,7 +18,7 @@ func (h *relayHandler) handleForward(ctx context.Context, conn net.Conn, network
}
h.logger = h.logger.WithFields(map[string]interface{}{
"dst": target.Addr(),
"dst": fmt.Sprintf("%s/%s", target.Addr(), network),
})
h.logger.Infof("%s >> %s", conn.RemoteAddr(), target.Addr())

25
pkg/handler/relay/handler.go
View File

@ -43,7 +43,7 @@ func (h *relayHandler) Init(md md.Metadata) (err error) {
return h.parseMetadata(md)
}
// implements chain.Chainable interface
// WithChain implements chain.Chainable interface
func (h *relayHandler) WithChain(chain *chain.Chain) {
h.chain = chain
}
@ -87,7 +87,7 @@ func (h *relayHandler) Handle(ctx context.Context, conn net.Conn) {
}
var user, pass string
var target string
var address string
for _, f := range req.Features {
if f.Type() == relay.FeatureUserAuth {
feature := f.(*relay.UserAuthFeature)
@ -95,16 +95,13 @@ func (h *relayHandler) Handle(ctx context.Context, conn net.Conn) {
}
if f.Type() == relay.FeatureAddr {
feature := f.(*relay.AddrFeature)
target = net.JoinHostPort(feature.Host, strconv.Itoa(int(feature.Port)))
address = net.JoinHostPort(feature.Host, strconv.Itoa(int(feature.Port)))
}
}
if user != "" {
h.logger = h.logger.WithFields(map[string]interface{}{"user": user})
}
if target != "" {
h.logger = h.logger.WithFields(map[string]interface{}{"dst": target})
}
resp := relay.Response{
Version: relay.Version1,
@ -123,7 +120,7 @@ func (h *relayHandler) Handle(ctx context.Context, conn net.Conn) {
}
if h.group != nil {
if target != "" {
if address != "" {
resp.Status = relay.StatusForbidden
resp.WriteTo(conn)
h.logger.Error("forbidden")
@ -134,13 +131,11 @@ func (h *relayHandler) Handle(ctx context.Context, conn net.Conn) {
return
}
if target == "" {
resp.Status = relay.StatusBadRequest
resp.WriteTo(conn)
h.logger.Error("target not specified")
return
switch req.Flags & relay.CmdMask {
case relay.CONNECT:
h.handleConnect(ctx, conn, network, address)
case relay.BIND:
h.handleBind(ctx, conn, network, address)
case relay.ASSOCIATE:
}
// proxy mode
h.handleProxy(ctx, conn, network, target)
}

22
pkg/handler/relay/metadata.go
View File

@ -12,13 +12,17 @@ type metadata struct {
authenticator auth.Authenticator
readTimeout time.Duration
retryCount int
enableBind bool
udpBufferSize int
}
func (h *relayHandler) parseMetadata(md md.Metadata) (err error) {
const (
users = "users"
readTimeout = "readTimeout"
retryCount = "retry"
users = "users"
readTimeout = "readTimeout"
retryCount = "retry"
enableBind = "bind"
udpBufferSize = "udpBufferSize"
)
if v, _ := md.Get(users).([]interface{}); len(v) > 0 {
@ -37,5 +41,17 @@ func (h *relayHandler) parseMetadata(md md.Metadata) (err error) {
}
h.md.readTimeout = md.GetDuration(readTimeout)
h.md.retryCount = md.GetInt(retryCount)
h.md.enableBind = md.GetBool(enableBind)
h.md.udpBufferSize = md.GetInt(udpBufferSize)
if h.md.udpBufferSize > 0 {
if h.md.udpBufferSize < 512 {
h.md.udpBufferSize = 512 // min buffer size
}
if h.md.udpBufferSize > 65*1024 {
h.md.udpBufferSize = 65 * 1024 // max buffer size
}
} else {
h.md.udpBufferSize = 1024 // default buffer size
}
return
}