mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-12-06 10:16:40 -05:00
149 lines
4.2 KiB
Go
149 lines
4.2 KiB
Go
// +build !confonly
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package http
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import (
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"context"
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"encoding/base64"
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"io"
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"strings"
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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/net"
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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/policy"
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"v2ray.com/core/transport"
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"v2ray.com/core/transport/internet"
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)
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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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}
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// NewClient create a new http 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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return &Client{
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serverPicker: protocol.NewRoundRobinServerPicker(serverList),
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policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
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}, nil
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}
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// Process implements proxy.Outbound.Process. We first create a socket tunnel via HTTP CONNECT method, then redirect all inbound traffic to that tunnel.
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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 := outbound.Target
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if destination.Network == net.Network_UDP {
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return newError("UDP is not supported by HTTP outbound")
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}
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var server *protocol.ServerSpec
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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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user := server.PickUser()
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if user != nil {
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p = c.policyManager.ForLevel(user.Level)
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}
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if err := setUpHttpTunnel(conn, conn, &destination, user); err != nil {
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return err
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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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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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var 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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// setUpHttpTunnel will create a socket tunnel via HTTP CONNECT method
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func setUpHttpTunnel(reader io.Reader, writer io.Writer, destination *net.Destination, user *protocol.MemoryUser) error {
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var headers []string
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destNetAddr := destination.NetAddr()
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headers = append(headers, "CONNECT "+destNetAddr+" HTTP/1.1")
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headers = append(headers, "Host: "+destNetAddr)
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if user != nil && user.Account != nil {
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account := user.Account.(*Account)
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auth := account.GetUsername() + ":" + account.GetPassword()
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headers = append(headers, "Proxy-Authorization: Basic "+base64.StdEncoding.EncodeToString([]byte(auth)))
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}
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headers = append(headers, "Proxy-Connection: Keep-Alive")
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b := buf.New()
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b.WriteString(strings.Join(headers, "\r\n") + "\r\n\r\n")
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if err := buf.WriteAllBytes(writer, b.Bytes()); err != nil {
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return err
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}
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b.Clear()
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if _, err := b.ReadFrom(reader); err != nil {
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return 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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