mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-11-10 14:26:26 -05:00
242 lines
7.2 KiB
Go
242 lines
7.2 KiB
Go
package socks
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import (
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"context"
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"time"
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core "github.com/v2fly/v2ray-core/v5"
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"github.com/v2fly/v2ray-core/v5/common"
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"github.com/v2fly/v2ray-core/v5/common/buf"
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"github.com/v2fly/v2ray-core/v5/common/net"
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"github.com/v2fly/v2ray-core/v5/common/net/packetaddr"
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"github.com/v2fly/v2ray-core/v5/common/protocol"
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"github.com/v2fly/v2ray-core/v5/common/retry"
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"github.com/v2fly/v2ray-core/v5/common/session"
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"github.com/v2fly/v2ray-core/v5/common/signal"
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"github.com/v2fly/v2ray-core/v5/common/task"
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"github.com/v2fly/v2ray-core/v5/features/dns"
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"github.com/v2fly/v2ray-core/v5/features/policy"
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"github.com/v2fly/v2ray-core/v5/transport"
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"github.com/v2fly/v2ray-core/v5/transport/internet"
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"github.com/v2fly/v2ray-core/v5/transport/internet/udp"
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)
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// Client is a Socks5 client.
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type Client struct {
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serverPicker protocol.ServerPicker
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policyManager policy.Manager
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version Version
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dns dns.Client
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}
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// NewClient create a new Socks5 client based on the given config.
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func NewClient(ctx context.Context, config *ClientConfig) (*Client, error) {
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serverList := protocol.NewServerList()
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for _, rec := range config.Server {
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s, err := protocol.NewServerSpecFromPB(rec)
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if err != nil {
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return nil, newError("failed to get server spec").Base(err)
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}
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serverList.AddServer(s)
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}
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if serverList.Size() == 0 {
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return nil, newError("0 target server")
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}
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v := core.MustFromContext(ctx)
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c := &Client{
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serverPicker: protocol.NewRoundRobinServerPicker(serverList),
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policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
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version: config.Version,
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}
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if config.Version == Version_SOCKS4 {
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c.dns = v.GetFeature(dns.ClientType()).(dns.Client)
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}
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return c, nil
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}
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// Process implements proxy.Outbound.Process.
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func (c *Client) 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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// Destination of the inner request.
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destination := outbound.Target
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// Outbound server.
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var server *protocol.ServerSpec
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// Outbound server's destination.
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var dest net.Destination
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// Connection to the outbound server.
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var conn internet.Connection
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if err := retry.ExponentialBackoff(5, 100).On(func() error {
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server = c.serverPicker.PickServer()
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dest = server.Destination()
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rawConn, err := dialer.Dial(ctx, dest)
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if err != nil {
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return err
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}
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conn = rawConn
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return nil
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}); err != nil {
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return newError("failed to find an available destination").Base(err)
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}
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defer func() {
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if err := conn.Close(); err != nil {
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newError("failed to closed connection").Base(err).WriteToLog(session.ExportIDToError(ctx))
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}
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}()
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p := c.policyManager.ForLevel(0)
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request := &protocol.RequestHeader{
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Version: socks5Version,
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Command: protocol.RequestCommandTCP,
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Address: destination.Address,
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Port: destination.Port,
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}
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switch c.version {
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case Version_SOCKS4:
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if request.Address.Family().IsDomain() {
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if d, ok := c.dns.(dns.ClientWithIPOption); ok {
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d.SetFakeDNSOption(false) // Skip FakeDNS
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} else {
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newError("DNS client doesn't implement ClientWithIPOption")
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}
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lookupFunc := c.dns.LookupIP
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if lookupIPv4, ok := c.dns.(dns.IPv4Lookup); ok {
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lookupFunc = lookupIPv4.LookupIPv4
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}
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ips, err := lookupFunc(request.Address.Domain())
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if err != nil {
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return 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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request.Address = net.IPAddress(ips[0])
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}
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fallthrough
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case Version_SOCKS4A:
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request.Version = socks4Version
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if destination.Network == net.Network_UDP {
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return newError("udp is not supported in socks4")
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} else if destination.Address.Family().IsIPv6() {
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return newError("ipv6 is not supported in socks4")
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}
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}
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if destination.Network == net.Network_UDP {
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request.Command = protocol.RequestCommandUDP
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}
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user := server.PickUser()
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if user != nil {
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request.User = user
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p = c.policyManager.ForLevel(user.Level)
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}
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if err := conn.SetDeadline(time.Now().Add(p.Timeouts.Handshake)); err != nil {
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newError("failed to set deadline for handshake").Base(err).WriteToLog(session.ExportIDToError(ctx))
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}
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var udpRequest *protocol.RequestHeader
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var err error
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if request.Version == socks4Version {
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err = ClientHandshake4(request, conn, conn)
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if err != nil {
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return newError("failed to establish connection to server").AtWarning().Base(err)
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}
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} else {
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udpRequest, err = ClientHandshake(request, conn, conn)
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if err != nil {
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return newError("failed to establish connection to server").AtWarning().Base(err)
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}
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}
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if udpRequest != nil {
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if udpRequest.Address == net.AnyIP || udpRequest.Address == net.AnyIPv6 {
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udpRequest.Address = dest.Address
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}
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}
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if err := conn.SetDeadline(time.Time{}); err != nil {
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newError("failed to clear deadline after handshake").Base(err).WriteToLog(session.ExportIDToError(ctx))
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}
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ctx, cancel := context.WithCancel(ctx)
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timer := signal.CancelAfterInactivity(ctx, cancel, p.Timeouts.ConnectionIdle)
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if packetConn, err := packetaddr.ToPacketAddrConn(link, destination); err == nil {
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udpConn, err := dialer.Dial(ctx, udpRequest.Destination())
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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 udpConn.Close()
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requestDone := func() error {
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protocolWriter := NewUDPWriter(request, udpConn)
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return udp.CopyPacketConn(protocolWriter, packetConn, udp.UpdateActivity(timer))
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}
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responseDone := func() error {
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protocolReader := &UDPReader{
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reader: udpConn,
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}
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return udp.CopyPacketConn(packetConn, protocolReader, udp.UpdateActivity(timer))
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}
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responseDoneAndCloseWriter := task.OnSuccess(responseDone, task.Close(link.Writer))
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if err := task.Run(ctx, requestDone, responseDoneAndCloseWriter); 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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var requestFunc func() error
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var responseFunc func() error
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if request.Command == protocol.RequestCommandTCP {
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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 request.Command == protocol.RequestCommandUDP {
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udpConn, err := dialer.Dial(ctx, udpRequest.Destination())
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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 udpConn.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.SequentialWriter{Writer: NewUDPWriter(request, udpConn)}, 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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reader := &UDPReader{reader: udpConn}
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return buf.Copy(reader, link.Writer, buf.UpdateActivity(timer))
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}
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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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func init() {
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common.Must(common.RegisterConfig((*ClientConfig)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
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return NewClient(ctx, config.(*ClientConfig))
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}))
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}
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