mirror of
https://github.com/XTLS/Xray-core.git
synced 2024-07-01 15:39:21 +03:00
325 lines
9.0 KiB
Go
325 lines
9.0 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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"context"
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"fmt"
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"net/netip"
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"strings"
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"sync"
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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/dice"
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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 Tunnel
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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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endpoints []netip.Addr
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hasIPv4, hasIPv6 bool
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wgLock sync.Mutex
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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, hasIPv4, hasIPv6, 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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d := v.GetFeature(dns.ClientType()).(dns.Client)
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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: d,
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endpoints: endpoints,
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hasIPv4: hasIPv4,
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hasIPv6: hasIPv6,
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}, nil
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}
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func (h *Handler) processWireGuard(dialer internet.Dialer) (err error) {
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h.wgLock.Lock()
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defer h.wgLock.Unlock()
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if h.bind != nil && h.bind.dialer == dialer && h.net != nil {
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return nil
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}
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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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if h.net != nil {
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_ = h.net.Close()
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h.net = nil
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}
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if h.bind != nil {
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_ = h.bind.Close()
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h.bind = nil
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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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netBind: netBind{
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dns: h.dns,
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dnsOption: dns.IPOption{
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IPv4Enable: h.hasIPv4,
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IPv6Enable: h.hasIPv6,
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},
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workers: int(h.conf.NumWorkers),
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},
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dialer: dialer,
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reserved: h.conf.Reserved,
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}
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defer func() {
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if err != nil {
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_ = bind.Close()
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}
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}()
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h.net, err = h.makeVirtualTun(bind)
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if err != nil {
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return newError("failed to create virtual tun interface").Base(err)
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}
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h.bind = bind
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return 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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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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outbound.Name = "wireguard"
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inbound := session.InboundFromContext(ctx)
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if inbound != nil {
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inbound.SetCanSpliceCopy(3)
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}
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if err := h.processWireGuard(dialer); err != nil {
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return err
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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.hasIPv4 && h.conf.preferIP4(),
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IPv6Enable: h.hasIPv6 && h.conf.preferIP6(),
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})
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{ // Resolve fallback
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if (len(ips) == 0 || err != nil) && h.conf.hasFallback() {
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ips, err = h.dns.LookupIP(addr.Domain(), dns.IPOption{
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IPv4Enable: h.hasIPv4 && h.conf.fallbackIP4(),
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IPv6Enable: h.hasIPv6 && h.conf.fallbackIP6(),
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})
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}
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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[dice.Roll(len(ips))])
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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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defer conn.Close()
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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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defer conn.Close()
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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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common.Interrupt(link.Reader)
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common.Interrupt(link.Writer)
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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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// creates a tun interface on netstack given a configuration
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func (h *Handler) makeVirtualTun(bind *netBindClient) (Tunnel, error) {
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t, err := h.conf.createTun()(h.endpoints, int(h.conf.Mtu), nil)
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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 = h.hasIPv4
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bind.dnsOption.IPv6Enable = h.hasIPv6
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if err = t.BuildDevice(h.createIPCRequest(bind, h.conf), bind); err != nil {
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_ = t.Close()
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return nil, err
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}
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return t, nil
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}
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// serialize the config into an IPC request
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func (h *Handler) createIPCRequest(bind *netBindClient, conf *DeviceConfig) string {
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var request strings.Builder
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request.WriteString(fmt.Sprintf("private_key=%s\n", conf.SecretKey))
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if !conf.IsClient {
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// placeholder, we'll handle actual port listening on Xray
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request.WriteString("listen_port=1337\n")
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}
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for _, peer := range conf.Peers {
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if peer.PublicKey != "" {
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request.WriteString(fmt.Sprintf("public_key=%s\n", peer.PublicKey))
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}
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if peer.PreSharedKey != "" {
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request.WriteString(fmt.Sprintf("preshared_key=%s\n", peer.PreSharedKey))
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}
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address, port, err := net.SplitHostPort(peer.Endpoint)
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if err != nil {
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newError("failed to split endpoint ", peer.Endpoint, " into address and port").AtError().WriteToLog()
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}
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addr := net.ParseAddress(address)
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if addr.Family().IsDomain() {
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dialerIp := bind.dialer.DestIpAddress()
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if dialerIp != nil {
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addr = net.ParseAddress(dialerIp.String())
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newError("createIPCRequest use dialer dest ip: ", addr).WriteToLog()
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} else {
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ips, err := h.dns.LookupIP(addr.Domain(), dns.IPOption{
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IPv4Enable: h.hasIPv4 && h.conf.preferIP4(),
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IPv6Enable: h.hasIPv6 && h.conf.preferIP6(),
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})
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{ // Resolve fallback
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if (len(ips) == 0 || err != nil) && h.conf.hasFallback() {
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ips, err = h.dns.LookupIP(addr.Domain(), dns.IPOption{
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IPv4Enable: h.hasIPv4 && h.conf.fallbackIP4(),
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IPv6Enable: h.hasIPv6 && h.conf.fallbackIP6(),
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})
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}
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}
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if err != nil {
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newError("createIPCRequest failed to lookup DNS").Base(err).WriteToLog()
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} else if len(ips) == 0 {
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newError("createIPCRequest empty lookup DNS").WriteToLog()
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} else {
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addr = net.IPAddress(ips[dice.Roll(len(ips))])
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}
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}
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}
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if peer.Endpoint != "" {
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request.WriteString(fmt.Sprintf("endpoint=%s:%s\n", addr, port))
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}
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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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if peer.KeepAlive != 0 {
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request.WriteString(fmt.Sprintf("persistent_keepalive_interval=%d\n", peer.KeepAlive))
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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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