/
entrypoint.go
378 lines (321 loc) · 8.3 KB
/
entrypoint.go
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package tunnel
import (
"bufio"
"context"
"fmt"
"io"
"net"
"net/http"
"net/http/httputil"
"strconv"
"strings"
"time"
"github.com/dolfly/core/handler"
"github.com/dolfly/core/ingress"
"github.com/dolfly/core/listener"
"github.com/dolfly/core/logger"
md "github.com/dolfly/core/metadata"
"github.com/dolfly/core/sd"
admission "github.com/dolfly/x/admission/wrapper"
xio "github.com/dolfly/x/internal/io"
xnet "github.com/dolfly/x/internal/net"
"github.com/dolfly/x/internal/net/proxyproto"
climiter "github.com/dolfly/x/limiter/conn/wrapper"
limiter "github.com/dolfly/x/limiter/traffic/wrapper"
metrics "github.com/dolfly/x/metrics/wrapper"
"github.com/go-gost/relay"
)
type entrypoint struct {
node string
pool *ConnectorPool
ingress ingress.Ingress
sd sd.SD
log logger.Logger
}
func (ep *entrypoint) handle(ctx context.Context, conn net.Conn) error {
defer conn.Close()
start := time.Now()
log := ep.log.WithFields(map[string]any{
"remote": conn.RemoteAddr().String(),
"local": conn.LocalAddr().String(),
})
log.Infof("%s <> %s", conn.RemoteAddr(), conn.LocalAddr())
defer func() {
log.WithFields(map[string]any{
"duration": time.Since(start),
}).Infof("%s >< %s", conn.RemoteAddr(), conn.LocalAddr())
}()
br := bufio.NewReader(conn)
v, err := br.Peek(1)
if err != nil {
return err
}
if v[0] == relay.Version1 {
return ep.handleConnect(ctx, xnet.NewBufferReaderConn(conn, br), log)
}
var cc net.Conn
for {
resp := &http.Response{
ProtoMajor: 1,
ProtoMinor: 1,
Header: http.Header{},
StatusCode: http.StatusServiceUnavailable,
}
err := func() error {
req, err := http.ReadRequest(br)
if err != nil {
// log.Errorf("read http request: %v", err)
return err
}
if log.IsLevelEnabled(logger.TraceLevel) {
dump, _ := httputil.DumpRequest(req, false)
log.Trace(string(dump))
}
var tunnelID relay.TunnelID
if ep.ingress != nil {
if rule := ep.ingress.GetRule(ctx, req.Host); rule != nil {
tunnelID = parseTunnelID(rule.Endpoint)
}
}
if tunnelID.IsZero() {
err := fmt.Errorf("no route to host %s", req.Host)
log.Error(err)
resp.StatusCode = http.StatusBadGateway
return resp.Write(conn)
}
if tunnelID.IsPrivate() {
err := fmt.Errorf("access denied: tunnel %s is private for host %s", tunnelID, req.Host)
log.Error(err)
resp.StatusCode = http.StatusBadGateway
return resp.Write(conn)
}
log = log.WithFields(map[string]any{
"host": req.Host,
"tunnel": tunnelID.String(),
})
remoteAddr := conn.RemoteAddr()
if addr := ep.getRealClientAddr(req, remoteAddr); addr != remoteAddr {
log = log.WithFields(map[string]any{
"src": addr.String(),
})
remoteAddr = addr
}
d := &Dialer{
node: ep.node,
pool: ep.pool,
sd: ep.sd,
retry: 3,
timeout: 15 * time.Second,
log: log,
}
cc, node, cid, err := d.Dial(ctx, "tcp", tunnelID.String())
if err != nil {
log.Error(err)
return resp.Write(conn)
}
log.Debugf("new connection to tunnel: %s, connector: %s", tunnelID, cid)
host := req.Host
if h, _, _ := net.SplitHostPort(host); h == "" {
host = net.JoinHostPort(host, "80")
}
if node == ep.node {
var features []relay.Feature
af := &relay.AddrFeature{}
af.ParseFrom(remoteAddr.String())
features = append(features, af) // src address
af = &relay.AddrFeature{}
af.ParseFrom(host)
features = append(features, af) // dst address
(&relay.Response{
Version: relay.Version1,
Status: relay.StatusOK,
Features: features,
}).WriteTo(cc)
}
if err := req.Write(cc); err != nil {
cc.Close()
log.Errorf("send request: %v", err)
return resp.Write(conn)
}
if req.Header.Get("Upgrade") == "websocket" {
err := xnet.Transport(cc, xio.NewReadWriter(br, conn))
if err == nil {
err = io.EOF
}
return err
}
go func() {
defer cc.Close()
t := time.Now()
log.Debugf("%s <-> %s", remoteAddr, host)
defer func() {
log.WithFields(map[string]any{
"duration": time.Since(t),
}).Debugf("%s >-< %s", remoteAddr, host)
}()
res, err := http.ReadResponse(bufio.NewReader(cc), req)
if err != nil {
log.Errorf("read response: %v", err)
resp.Write(conn)
return
}
if log.IsLevelEnabled(logger.TraceLevel) {
dump, _ := httputil.DumpResponse(res, false)
log.Trace(string(dump))
}
if err = res.Write(conn); err != nil {
log.Errorf("write response: %v", err)
}
}()
return nil
}()
if err != nil {
if cc != nil {
cc.Close()
}
break
}
}
return nil
}
func (ep *entrypoint) handleConnect(ctx context.Context, conn net.Conn, log logger.Logger) error {
req := relay.Request{}
if _, err := req.ReadFrom(conn); err != nil {
return err
}
resp := relay.Response{
Version: relay.Version1,
Status: relay.StatusOK,
}
var srcAddr, dstAddr string
network := "tcp"
var tunnelID relay.TunnelID
for _, f := range req.Features {
switch f.Type() {
case relay.FeatureAddr:
if feature, _ := f.(*relay.AddrFeature); feature != nil {
v := net.JoinHostPort(feature.Host, strconv.Itoa(int(feature.Port)))
if srcAddr != "" {
dstAddr = v
} else {
srcAddr = v
}
}
case relay.FeatureTunnel:
if feature, _ := f.(*relay.TunnelFeature); feature != nil {
tunnelID = relay.NewTunnelID(feature.ID[:])
}
case relay.FeatureNetwork:
if feature, _ := f.(*relay.NetworkFeature); feature != nil {
network = feature.Network.String()
}
}
}
if tunnelID.IsZero() {
resp.Status = relay.StatusBadRequest
resp.WriteTo(conn)
return ErrTunnelID
}
d := Dialer{
pool: ep.pool,
retry: 3,
timeout: 15 * time.Second,
log: log,
}
cc, _, cid, err := d.Dial(ctx, network, tunnelID.String())
if err != nil {
log.Error(err)
resp.Status = relay.StatusServiceUnavailable
resp.WriteTo(conn)
return err
}
defer cc.Close()
log.Debugf("new connection to tunnel: %s, connector: %s", tunnelID, cid)
if _, err := resp.WriteTo(conn); err != nil {
log.Error(err)
return err
}
af := &relay.AddrFeature{}
af.ParseFrom(srcAddr)
resp.Features = append(resp.Features, af) // src address
af = &relay.AddrFeature{}
af.ParseFrom(dstAddr)
resp.Features = append(resp.Features, af) // dst address
resp.WriteTo(cc)
t := time.Now()
log.Debugf("%s <-> %s", conn.RemoteAddr(), cc.RemoteAddr())
xnet.Transport(conn, cc)
log.WithFields(map[string]any{
"duration": time.Since(t),
}).Debugf("%s >-< %s", conn.RemoteAddr(), cc.RemoteAddr())
return nil
}
func (ep *entrypoint) getRealClientAddr(req *http.Request, raddr net.Addr) net.Addr {
if req == nil {
return nil
}
// cloudflare CDN
sip := req.Header.Get("CF-Connecting-IP")
if sip == "" {
ss := strings.Split(req.Header.Get("X-Forwarded-For"), ",")
if len(ss) > 0 && ss[0] != "" {
sip = ss[0]
}
}
if sip == "" {
sip = req.Header.Get("X-Real-Ip")
}
ip := net.ParseIP(sip)
if ip == nil {
return raddr
}
_, sp, _ := net.SplitHostPort(raddr.String())
port, _ := strconv.Atoi(sp)
return &net.TCPAddr{
IP: ip,
Port: port,
}
}
type tcpListener struct {
ln net.Listener
options listener.Options
}
func newTCPListener(ln net.Listener, opts ...listener.Option) listener.Listener {
options := listener.Options{}
for _, opt := range opts {
opt(&options)
}
return &tcpListener{
ln: ln,
options: options,
}
}
func (l *tcpListener) Init(md md.Metadata) (err error) {
// l.logger.Debugf("pp: %d", l.options.ProxyProtocol)
ln := l.ln
ln = proxyproto.WrapListener(l.options.ProxyProtocol, ln, 10*time.Second)
ln = metrics.WrapListener(l.options.Service, ln)
ln = admission.WrapListener(l.options.Admission, ln)
ln = limiter.WrapListener(l.options.TrafficLimiter, ln)
ln = climiter.WrapListener(l.options.ConnLimiter, ln)
l.ln = ln
return
}
func (l *tcpListener) Accept() (conn net.Conn, err error) {
return l.ln.Accept()
}
func (l *tcpListener) Addr() net.Addr {
return l.ln.Addr()
}
func (l *tcpListener) Close() error {
return l.ln.Close()
}
type entrypointHandler struct {
ep *entrypoint
}
func (h *entrypointHandler) Init(md md.Metadata) (err error) {
return
}
func (h *entrypointHandler) Handle(ctx context.Context, conn net.Conn, opts ...handler.HandleOption) error {
return h.ep.handle(ctx, conn)
}