mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-12-21 17:46:58 -05:00
486 lines
15 KiB
Go
486 lines
15 KiB
Go
// +build !confonly
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package inbound
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//go:generate go run v2ray.com/core/common/errors/errorgen
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import (
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"context"
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"io"
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"strconv"
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"time"
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"v2ray.com/core"
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"v2ray.com/core/common"
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"v2ray.com/core/common/buf"
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"v2ray.com/core/common/errors"
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"v2ray.com/core/common/log"
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"v2ray.com/core/common/net"
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"v2ray.com/core/common/platform"
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"v2ray.com/core/common/protocol"
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"v2ray.com/core/common/retry"
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"v2ray.com/core/common/session"
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"v2ray.com/core/common/signal"
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"v2ray.com/core/common/task"
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"v2ray.com/core/features/dns"
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feature_inbound "v2ray.com/core/features/inbound"
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"v2ray.com/core/features/policy"
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"v2ray.com/core/features/routing"
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"v2ray.com/core/proxy/vless"
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"v2ray.com/core/proxy/vless/encoding"
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"v2ray.com/core/transport/internet"
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"v2ray.com/core/transport/internet/tls"
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"v2ray.com/core/transport/internet/xtls"
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)
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var (
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xtls_show = false
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)
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func init() {
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common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
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var dc dns.Client
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if err := core.RequireFeatures(ctx, func(d dns.Client) error {
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dc = d
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return nil
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}); err != nil {
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return nil, err
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}
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return New(ctx, config.(*Config), dc)
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}))
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const defaultFlagValue = "NOT_DEFINED_AT_ALL"
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xtlsShow := platform.NewEnvFlag("v2ray.vless.xtls.show").GetValue(func() string { return defaultFlagValue })
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if xtlsShow == "true" {
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xtls_show = true
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}
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}
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// Handler is an inbound connection handler that handles messages in VLess protocol.
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type Handler struct {
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inboundHandlerManager feature_inbound.Manager
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policyManager policy.Manager
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validator *vless.Validator
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dns dns.Client
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fallbacks map[string]map[string]*Fallback // or nil
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// regexps map[string]*regexp.Regexp // or nil
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}
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// New creates a new VLess inbound handler.
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func New(ctx context.Context, config *Config, dc dns.Client) (*Handler, error) {
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v := core.MustFromContext(ctx)
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handler := &Handler{
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inboundHandlerManager: v.GetFeature(feature_inbound.ManagerType()).(feature_inbound.Manager),
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policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
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validator: new(vless.Validator),
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dns: dc,
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}
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for _, user := range config.Clients {
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u, err := user.ToMemoryUser()
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if err != nil {
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return nil, newError("failed to get VLESS user").Base(err).AtError()
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}
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if err := handler.AddUser(ctx, u); err != nil {
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return nil, newError("failed to initiate user").Base(err).AtError()
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}
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}
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if config.Fallbacks != nil {
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handler.fallbacks = make(map[string]map[string]*Fallback)
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// handler.regexps = make(map[string]*regexp.Regexp)
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for _, fb := range config.Fallbacks {
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if handler.fallbacks[fb.Alpn] == nil {
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handler.fallbacks[fb.Alpn] = make(map[string]*Fallback)
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}
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handler.fallbacks[fb.Alpn][fb.Path] = fb
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/*
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if fb.Path != "" {
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if r, err := regexp.Compile(fb.Path); err != nil {
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return nil, newError("invalid path regexp").Base(err).AtError()
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} else {
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handler.regexps[fb.Path] = r
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}
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}
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*/
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}
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if handler.fallbacks[""] != nil {
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for alpn, pfb := range handler.fallbacks {
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if alpn != "" { // && alpn != "h2" {
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for path, fb := range handler.fallbacks[""] {
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if pfb[path] == nil {
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pfb[path] = fb
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}
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}
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}
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}
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}
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}
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return handler, nil
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}
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// Close implements common.Closable.Close().
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func (h *Handler) Close() error {
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return errors.Combine(common.Close(h.validator))
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}
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// AddUser implements proxy.UserManager.AddUser().
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func (h *Handler) AddUser(ctx context.Context, u *protocol.MemoryUser) error {
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return h.validator.Add(u)
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}
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// RemoveUser implements proxy.UserManager.RemoveUser().
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func (h *Handler) RemoveUser(ctx context.Context, e string) error {
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return h.validator.Del(e)
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}
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// Network implements proxy.Inbound.Network().
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func (*Handler) Network() []net.Network {
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return []net.Network{net.Network_TCP}
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}
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// Process implements proxy.Inbound.Process().
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func (h *Handler) Process(ctx context.Context, network net.Network, connection internet.Connection, dispatcher routing.Dispatcher) error {
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sid := session.ExportIDToError(ctx)
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iConn := connection
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if statConn, ok := iConn.(*internet.StatCouterConnection); ok {
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iConn = statConn.Connection
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}
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sessionPolicy := h.policyManager.ForLevel(0)
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if err := connection.SetReadDeadline(time.Now().Add(sessionPolicy.Timeouts.Handshake)); err != nil {
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return newError("unable to set read deadline").Base(err).AtWarning()
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}
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first := buf.New()
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defer first.Release()
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firstLen, _ := first.ReadFrom(connection)
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newError("firstLen = ", firstLen).AtInfo().WriteToLog(sid)
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reader := &buf.BufferedReader{
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Reader: buf.NewReader(connection),
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Buffer: buf.MultiBuffer{first},
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}
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var request *protocol.RequestHeader
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var requestAddons *encoding.Addons
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var err error
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apfb := h.fallbacks
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isfb := apfb != nil
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if isfb && firstLen < 18 {
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err = newError("fallback directly")
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} else {
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request, requestAddons, isfb, err = encoding.DecodeRequestHeader(isfb, first, reader, h.validator)
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}
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if err != nil {
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if isfb {
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if err := connection.SetReadDeadline(time.Time{}); err != nil {
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newError("unable to set back read deadline").Base(err).AtWarning().WriteToLog(sid)
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}
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newError("fallback starts").Base(err).AtInfo().WriteToLog(sid)
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alpn := ""
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if len(apfb) > 1 || apfb[""] == nil {
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if tlsConn, ok := iConn.(*tls.Conn); ok {
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alpn = tlsConn.ConnectionState().NegotiatedProtocol
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newError("realAlpn = " + alpn).AtInfo().WriteToLog(sid)
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} else if xtlsConn, ok := iConn.(*xtls.Conn); ok {
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alpn = xtlsConn.ConnectionState().NegotiatedProtocol
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newError("realAlpn = " + alpn).AtInfo().WriteToLog(sid)
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}
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if apfb[alpn] == nil {
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alpn = ""
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}
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}
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pfb := apfb[alpn]
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if pfb == nil {
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return newError(`failed to find the default "alpn" config`).AtWarning()
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}
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path := ""
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if len(pfb) > 1 || pfb[""] == nil {
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/*
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if lines := bytes.Split(firstBytes, []byte{'\r', '\n'}); len(lines) > 1 {
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if s := bytes.Split(lines[0], []byte{' '}); len(s) == 3 {
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if len(s[0]) < 8 && len(s[1]) > 0 && len(s[2]) == 8 {
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newError("realPath = " + string(s[1])).AtInfo().WriteToLog(sid)
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for _, fb := range pfb {
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if fb.Path != "" && h.regexps[fb.Path].Match(s[1]) {
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path = fb.Path
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break
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}
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}
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}
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}
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}
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*/
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if firstLen >= 18 && first.Byte(4) != '*' { // not h2c
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firstBytes := first.Bytes()
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for i := 4; i <= 8; i++ { // 5 -> 9
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if firstBytes[i] == '/' && firstBytes[i-1] == ' ' {
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search := len(firstBytes)
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if search > 64 {
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search = 64 // up to about 60
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}
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for j := i + 1; j < search; j++ {
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k := firstBytes[j]
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if k == '\r' || k == '\n' { // avoid logging \r or \n
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break
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}
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if k == ' ' {
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path = string(firstBytes[i:j])
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newError("realPath = " + path).AtInfo().WriteToLog(sid)
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if pfb[path] == nil {
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path = ""
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}
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break
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}
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}
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break
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}
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}
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}
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}
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fb := pfb[path]
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if fb == nil {
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return newError(`failed to find the default "path" config`).AtWarning()
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}
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ctx, cancel := context.WithCancel(ctx)
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timer := signal.CancelAfterInactivity(ctx, cancel, sessionPolicy.Timeouts.ConnectionIdle)
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ctx = policy.ContextWithBufferPolicy(ctx, sessionPolicy.Buffer)
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var conn net.Conn
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if err := retry.ExponentialBackoff(5, 100).On(func() error {
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var dialer net.Dialer
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conn, err = dialer.DialContext(ctx, fb.Type, fb.Dest)
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if err != nil {
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return err
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}
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return nil
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}); err != nil {
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return newError("failed to dial to " + fb.Dest).Base(err).AtWarning()
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}
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defer conn.Close()
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serverReader := buf.NewReader(conn)
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serverWriter := buf.NewWriter(conn)
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postRequest := func() error {
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defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly)
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if fb.Xver != 0 {
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remoteAddr, remotePort, err := net.SplitHostPort(connection.RemoteAddr().String())
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if err != nil {
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return err
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}
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localAddr, localPort, err := net.SplitHostPort(connection.LocalAddr().String())
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if err != nil {
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return err
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}
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ipv4 := true
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for i := 0; i < len(remoteAddr); i++ {
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if remoteAddr[i] == ':' {
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ipv4 = false
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break
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}
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}
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pro := buf.New()
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defer pro.Release()
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switch fb.Xver {
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case 1:
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if ipv4 {
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pro.Write([]byte("PROXY TCP4 " + remoteAddr + " " + localAddr + " " + remotePort + " " + localPort + "\r\n"))
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} else {
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pro.Write([]byte("PROXY TCP6 " + remoteAddr + " " + localAddr + " " + remotePort + " " + localPort + "\r\n"))
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}
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case 2:
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pro.Write([]byte("\x0D\x0A\x0D\x0A\x00\x0D\x0A\x51\x55\x49\x54\x0A\x21")) // signature + v2 + PROXY
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if ipv4 {
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pro.Write([]byte("\x11\x00\x0C")) // AF_INET + STREAM + 12 bytes
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pro.Write(net.ParseIP(remoteAddr).To4())
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pro.Write(net.ParseIP(localAddr).To4())
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} else {
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pro.Write([]byte("\x21\x00\x24")) // AF_INET6 + STREAM + 36 bytes
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pro.Write(net.ParseIP(remoteAddr).To16())
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pro.Write(net.ParseIP(localAddr).To16())
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}
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p1, _ := strconv.ParseUint(remotePort, 10, 16)
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p2, _ := strconv.ParseUint(localPort, 10, 16)
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pro.Write([]byte{byte(p1 >> 8), byte(p1), byte(p2 >> 8), byte(p2)})
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}
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if err := serverWriter.WriteMultiBuffer(buf.MultiBuffer{pro}); err != nil {
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return newError("failed to set PROXY protocol v", fb.Xver).Base(err).AtWarning()
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}
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}
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if err := buf.Copy(reader, serverWriter, buf.UpdateActivity(timer)); err != nil {
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return newError("failed to fallback request payload").Base(err).AtInfo()
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}
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return nil
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}
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writer := buf.NewWriter(connection)
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getResponse := func() error {
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defer timer.SetTimeout(sessionPolicy.Timeouts.UplinkOnly)
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if err := buf.Copy(serverReader, writer, buf.UpdateActivity(timer)); err != nil {
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return newError("failed to deliver response payload").Base(err).AtInfo()
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}
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return nil
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}
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if err := task.Run(ctx, task.OnSuccess(postRequest, task.Close(serverWriter)), task.OnSuccess(getResponse, task.Close(writer))); err != nil {
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common.Interrupt(serverReader)
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common.Interrupt(serverWriter)
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return newError("fallback ends").Base(err).AtInfo()
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}
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return nil
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}
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if errors.Cause(err) != io.EOF {
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log.Record(&log.AccessMessage{
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From: connection.RemoteAddr(),
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To: "",
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Status: log.AccessRejected,
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Reason: err,
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})
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err = newError("invalid request from ", connection.RemoteAddr()).Base(err).AtInfo()
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}
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return err
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}
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if err := connection.SetReadDeadline(time.Time{}); err != nil {
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newError("unable to set back read deadline").Base(err).AtWarning().WriteToLog(sid)
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}
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newError("received request for ", request.Destination()).AtInfo().WriteToLog(sid)
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inbound := session.InboundFromContext(ctx)
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if inbound == nil {
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panic("no inbound metadata")
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}
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inbound.User = request.User
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account := request.User.Account.(*vless.MemoryAccount)
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responseAddons := &encoding.Addons{
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// Flow: requestAddons.Flow,
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}
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switch requestAddons.Flow {
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case vless.XRO, vless.XRD:
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if account.Flow == requestAddons.Flow {
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switch request.Command {
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case protocol.RequestCommandMux:
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return newError(requestAddons.Flow + " doesn't support Mux").AtWarning()
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case protocol.RequestCommandUDP:
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return newError(requestAddons.Flow + " doesn't support UDP").AtWarning()
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case protocol.RequestCommandTCP:
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if xtlsConn, ok := iConn.(*xtls.Conn); ok {
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xtlsConn.RPRX = true
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xtlsConn.SHOW = xtls_show
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xtlsConn.MARK = "XTLS"
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if requestAddons.Flow == vless.XRD {
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xtlsConn.DirectMode = true
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}
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} else {
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return newError(`failed to use ` + requestAddons.Flow + `, maybe "security" is not "xtls"`).AtWarning()
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}
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}
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} else {
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return newError(account.ID.String() + " is not able to use " + requestAddons.Flow).AtWarning()
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}
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case "":
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default:
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return newError("unknown request flow " + requestAddons.Flow).AtWarning()
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}
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if request.Command != protocol.RequestCommandMux {
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ctx = log.ContextWithAccessMessage(ctx, &log.AccessMessage{
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From: connection.RemoteAddr(),
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To: request.Destination(),
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Status: log.AccessAccepted,
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Reason: "",
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Email: request.User.Email,
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})
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}
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sessionPolicy = h.policyManager.ForLevel(request.User.Level)
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ctx, cancel := context.WithCancel(ctx)
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timer := signal.CancelAfterInactivity(ctx, cancel, sessionPolicy.Timeouts.ConnectionIdle)
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ctx = policy.ContextWithBufferPolicy(ctx, sessionPolicy.Buffer)
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link, err := dispatcher.Dispatch(ctx, request.Destination())
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if err != nil {
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return newError("failed to dispatch request to ", request.Destination()).Base(err).AtWarning()
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}
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serverReader := link.Reader // .(*pipe.Reader)
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serverWriter := link.Writer // .(*pipe.Writer)
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postRequest := func() error {
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defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly)
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// default: clientReader := reader
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clientReader := encoding.DecodeBodyAddons(reader, request, requestAddons)
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// from clientReader.ReadMultiBuffer to serverWriter.WriteMultiBufer
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if err := buf.Copy(clientReader, serverWriter, buf.UpdateActivity(timer)); err != nil {
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return newError("failed to transfer request payload").Base(err).AtInfo()
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}
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return nil
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}
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getResponse := func() error {
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defer timer.SetTimeout(sessionPolicy.Timeouts.UplinkOnly)
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bufferWriter := buf.NewBufferedWriter(buf.NewWriter(connection))
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if err := encoding.EncodeResponseHeader(bufferWriter, request, responseAddons); err != nil {
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return newError("failed to encode response header").Base(err).AtWarning()
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}
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// default: clientWriter := bufferWriter
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clientWriter := encoding.EncodeBodyAddons(bufferWriter, request, responseAddons)
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{
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multiBuffer, err := serverReader.ReadMultiBuffer()
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if err != nil {
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return err // ...
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}
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if err := clientWriter.WriteMultiBuffer(multiBuffer); err != nil {
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return err // ...
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}
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}
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// Flush; bufferWriter.WriteMultiBufer now is bufferWriter.writer.WriteMultiBuffer
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if err := bufferWriter.SetBuffered(false); err != nil {
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return newError("failed to write A response payload").Base(err).AtWarning()
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}
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// from serverReader.ReadMultiBuffer to clientWriter.WriteMultiBufer
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if err := buf.Copy(serverReader, clientWriter, buf.UpdateActivity(timer)); err != nil {
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return newError("failed to transfer response payload").Base(err).AtInfo()
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}
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// Indicates the end of response payload.
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switch responseAddons.Flow {
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default:
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}
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return nil
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}
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if err := task.Run(ctx, task.OnSuccess(postRequest, task.Close(serverWriter)), getResponse); err != nil {
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common.Interrupt(serverReader)
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common.Interrupt(serverWriter)
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return newError("connection ends").Base(err).AtInfo()
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}
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return nil
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}
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