mirror of
https://github.com/XTLS/Xray-core.git
synced 2024-12-23 11:53:33 +02:00
279 lines
7.8 KiB
Go
279 lines
7.8 KiB
Go
/*
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Some of codes are copied from https://github.com/octeep/wireproxy, license below.
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Copyright (c) 2022 Wind T.F. Wong <octeep@pm.me>
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Permission to use, copy, modify, and distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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package wireguard
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import (
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"bytes"
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"context"
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"fmt"
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"net/netip"
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"strings"
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"github.com/sagernet/wireguard-go/device"
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"github.com/xtls/xray-core/common"
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"github.com/xtls/xray-core/common/buf"
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"github.com/xtls/xray-core/common/log"
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"github.com/xtls/xray-core/common/net"
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"github.com/xtls/xray-core/common/protocol"
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"github.com/xtls/xray-core/common/session"
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"github.com/xtls/xray-core/common/signal"
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"github.com/xtls/xray-core/common/task"
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"github.com/xtls/xray-core/core"
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"github.com/xtls/xray-core/features/dns"
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"github.com/xtls/xray-core/features/policy"
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"github.com/xtls/xray-core/transport"
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"github.com/xtls/xray-core/transport/internet"
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)
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// Handler is an outbound connection that silently swallow the entire payload.
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type Handler struct {
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conf *DeviceConfig
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net *Net
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bind *netBindClient
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policyManager policy.Manager
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dns dns.Client
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// cached configuration
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ipc string
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endpoints []netip.Addr
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}
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// New creates a new wireguard handler.
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func New(ctx context.Context, conf *DeviceConfig) (*Handler, error) {
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v := core.MustFromContext(ctx)
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endpoints, err := parseEndpoints(conf)
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if err != nil {
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return nil, err
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}
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return &Handler{
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conf: conf,
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policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
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dns: v.GetFeature(dns.ClientType()).(dns.Client),
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ipc: createIPCRequest(conf),
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endpoints: endpoints,
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}, nil
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}
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// Process implements OutboundHandler.Dispatch().
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func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer internet.Dialer) error {
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if h.bind == nil || h.bind.dialer != dialer || h.net == nil {
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log.Record(&log.GeneralMessage{
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Severity: log.Severity_Info,
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Content: "switching dialer",
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})
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// bind := conn.NewStdNetBind() // TODO: conn.Bind wrapper for dialer
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bind := &netBindClient{
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dialer: dialer,
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workers: int(h.conf.NumWorkers),
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dns: h.dns,
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reserved: h.conf.Reserved,
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}
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net, err := h.makeVirtualTun(bind)
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if err != nil {
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bind.Close()
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return newError("failed to create virtual tun interface").Base(err)
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}
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h.net = net
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if h.bind != nil {
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h.bind.Close()
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}
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h.bind = bind
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}
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outbound := session.OutboundFromContext(ctx)
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if outbound == nil || !outbound.Target.IsValid() {
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return newError("target not specified")
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}
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// Destination of the inner request.
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destination := outbound.Target
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command := protocol.RequestCommandTCP
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if destination.Network == net.Network_UDP {
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command = protocol.RequestCommandUDP
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}
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// resolve dns
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addr := destination.Address
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if addr.Family().IsDomain() {
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ips, err := h.dns.LookupIP(addr.Domain(), dns.IPOption{
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IPv4Enable: h.net.HasV4(),
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IPv6Enable: h.net.HasV6(),
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})
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if err != nil {
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return newError("failed to lookup DNS").Base(err)
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} else if len(ips) == 0 {
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return dns.ErrEmptyResponse
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}
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addr = net.IPAddress(ips[0])
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}
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var newCtx context.Context
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var newCancel context.CancelFunc
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if session.TimeoutOnlyFromContext(ctx) {
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newCtx, newCancel = context.WithCancel(context.Background())
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}
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p := h.policyManager.ForLevel(0)
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ctx, cancel := context.WithCancel(ctx)
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timer := signal.CancelAfterInactivity(ctx, func() {
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cancel()
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if newCancel != nil {
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newCancel()
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}
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}, p.Timeouts.ConnectionIdle)
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addrPort := netip.AddrPortFrom(toNetIpAddr(addr), destination.Port.Value())
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var requestFunc func() error
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var responseFunc func() error
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if command == protocol.RequestCommandTCP {
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conn, err := h.net.DialContextTCPAddrPort(ctx, addrPort)
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if err != nil {
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return newError("failed to create TCP connection").Base(err)
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}
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requestFunc = func() error {
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defer timer.SetTimeout(p.Timeouts.DownlinkOnly)
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return buf.Copy(link.Reader, buf.NewWriter(conn), buf.UpdateActivity(timer))
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}
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responseFunc = func() error {
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defer timer.SetTimeout(p.Timeouts.UplinkOnly)
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return buf.Copy(buf.NewReader(conn), link.Writer, buf.UpdateActivity(timer))
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}
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} else if command == protocol.RequestCommandUDP {
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conn, err := h.net.DialUDPAddrPort(netip.AddrPort{}, addrPort)
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if err != nil {
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return newError("failed to create UDP connection").Base(err)
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}
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requestFunc = func() error {
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defer timer.SetTimeout(p.Timeouts.DownlinkOnly)
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return buf.Copy(link.Reader, buf.NewWriter(conn), buf.UpdateActivity(timer))
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}
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responseFunc = func() error {
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defer timer.SetTimeout(p.Timeouts.UplinkOnly)
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return buf.Copy(buf.NewReader(conn), link.Writer, buf.UpdateActivity(timer))
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}
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}
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if newCtx != nil {
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ctx = newCtx
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}
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responseDonePost := task.OnSuccess(responseFunc, task.Close(link.Writer))
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if err := task.Run(ctx, requestFunc, responseDonePost); err != nil {
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return newError("connection ends").Base(err)
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}
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return nil
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}
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// serialize the config into an IPC request
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func createIPCRequest(conf *DeviceConfig) string {
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var request bytes.Buffer
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request.WriteString(fmt.Sprintf("private_key=%s\n", conf.SecretKey))
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for _, peer := range conf.Peers {
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request.WriteString(fmt.Sprintf("public_key=%s\nendpoint=%s\npersistent_keepalive_interval=%d\npreshared_key=%s\n",
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peer.PublicKey, peer.Endpoint, peer.KeepAlive, peer.PreSharedKey))
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for _, ip := range peer.AllowedIps {
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request.WriteString(fmt.Sprintf("allowed_ip=%s\n", ip))
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}
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}
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return request.String()[:request.Len()]
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}
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// convert endpoint string to netip.Addr
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func parseEndpoints(conf *DeviceConfig) ([]netip.Addr, error) {
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endpoints := make([]netip.Addr, len(conf.Endpoint))
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for i, str := range conf.Endpoint {
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var addr netip.Addr
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if strings.Contains(str, "/") {
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prefix, err := netip.ParsePrefix(str)
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if err != nil {
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return nil, err
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}
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addr = prefix.Addr()
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if prefix.Bits() != addr.BitLen() {
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return nil, newError("interface address subnet should be /32 for IPv4 and /128 for IPv6")
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}
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} else {
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var err error
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addr, err = netip.ParseAddr(str)
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if err != nil {
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return nil, err
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}
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}
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endpoints[i] = addr
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}
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return endpoints, nil
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}
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// creates a tun interface on netstack given a configuration
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func (h *Handler) makeVirtualTun(bind *netBindClient) (*Net, error) {
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tun, tnet, err := CreateNetTUN(h.endpoints, h.dns, int(h.conf.Mtu))
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if err != nil {
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return nil, err
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}
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bind.dnsOption.IPv4Enable = tnet.HasV4()
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bind.dnsOption.IPv6Enable = tnet.HasV6()
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// dev := device.NewDevice(tun, conn.NewDefaultBind(), nil /* device.NewLogger(device.LogLevelVerbose, "") */)
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dev := device.NewDevice(tun, bind, &device.Logger{
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Verbosef: func(format string, args ...any) {
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log.Record(&log.GeneralMessage{
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Severity: log.Severity_Debug,
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Content: fmt.Sprintf(format, args...),
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})
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},
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Errorf: func(format string, args ...any) {
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log.Record(&log.GeneralMessage{
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Severity: log.Severity_Error,
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Content: fmt.Sprintf(format, args...),
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})
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},
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}, int(h.conf.NumWorkers))
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err = dev.IpcSet(h.ipc)
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if err != nil {
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return nil, err
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}
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err = dev.Up()
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if err != nil {
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return nil, err
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}
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return tnet, nil
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}
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func init() {
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common.Must(common.RegisterConfig((*DeviceConfig)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
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return New(ctx, config.(*DeviceConfig))
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}))
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}
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