mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-12-22 18:17:52 -05:00
163 lines
4.2 KiB
Go
163 lines
4.2 KiB
Go
package freedom
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//go:generate go run $GOPATH/src/v2ray.com/core/common/errors/errorgen/main.go -pkg freedom -path Proxy,Freedom
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import (
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"context"
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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/dice"
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"v2ray.com/core/common/net"
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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/proxy"
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"v2ray.com/core/transport/internet"
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)
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// Handler handles Freedom connections.
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type Handler struct {
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policyManager core.PolicyManager
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dns core.DNSClient
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config Config
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}
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// New creates a new Freedom handler.
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func New(ctx context.Context, config *Config) (*Handler, error) {
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v := core.MustFromContext(ctx)
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f := &Handler{
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config: *config,
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policyManager: v.PolicyManager(),
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dns: v.DNSClient(),
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}
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return f, nil
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}
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func (h *Handler) policy() core.Policy {
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p := h.policyManager.ForLevel(h.config.UserLevel)
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if h.config.Timeout > 0 && h.config.UserLevel == 0 {
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p.Timeouts.ConnectionIdle = time.Duration(h.config.Timeout) * time.Second
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}
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return p
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}
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func (h *Handler) resolveIP(ctx context.Context, domain string) net.Address {
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if resolver, ok := proxy.ResolvedIPsFromContext(ctx); ok {
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ips := resolver.Resolve()
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if len(ips) == 0 {
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return nil
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}
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return ips[dice.Roll(len(ips))]
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}
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ips, err := h.dns.LookupIP(domain)
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if err != nil {
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newError("failed to get IP address for domain ", domain).Base(err).WriteToLog(session.ExportIDToError(ctx))
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}
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if len(ips) == 0 {
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return nil
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}
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return net.IPAddress(ips[dice.Roll(len(ips))])
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}
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func isValidAddress(addr *net.IPOrDomain) bool {
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if addr == nil {
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return false
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}
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a := addr.AsAddress()
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return a != net.AnyIP
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}
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// Process implements proxy.Outbound.
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func (h *Handler) Process(ctx context.Context, link *core.Link, dialer proxy.Dialer) error {
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destination, _ := proxy.TargetFromContext(ctx)
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if h.config.DestinationOverride != nil {
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server := h.config.DestinationOverride.Server
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if isValidAddress(server.Address) {
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destination.Address = server.Address.AsAddress()
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}
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if server.Port != 0 {
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destination.Port = net.Port(server.Port)
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}
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}
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newError("opening connection to ", destination).WriteToLog(session.ExportIDToError(ctx))
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input := link.Reader
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output := link.Writer
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var conn internet.Connection
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err := retry.ExponentialBackoff(5, 100).On(func() error {
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dialDest := destination
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if h.config.DomainStrategy == Config_USE_IP && dialDest.Address.Family().IsDomain() {
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ip := h.resolveIP(ctx, dialDest.Address.Domain())
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if ip != nil {
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dialDest = net.Destination{
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Network: dialDest.Network,
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Address: ip,
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Port: dialDest.Port,
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}
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newError("dialing to to ", dialDest).WriteToLog(session.ExportIDToError(ctx))
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}
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}
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rawConn, err := dialer.Dial(ctx, dialDest)
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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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})
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if err != nil {
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return newError("failed to open connection to ", destination).Base(err)
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}
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defer conn.Close() // nolint: errcheck
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plcy := h.policy()
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ctx, cancel := context.WithCancel(ctx)
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timer := signal.CancelAfterInactivity(ctx, cancel, plcy.Timeouts.ConnectionIdle)
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requestDone := func() error {
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defer timer.SetTimeout(plcy.Timeouts.DownlinkOnly)
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var writer buf.Writer
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if destination.Network == net.Network_TCP {
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writer = buf.NewWriter(conn)
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} else {
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writer = &buf.SequentialWriter{Writer: conn}
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}
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if err := buf.Copy(input, writer, buf.UpdateActivity(timer)); err != nil {
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return newError("failed to process request").Base(err)
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}
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return nil
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}
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responseDone := func() error {
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defer timer.SetTimeout(plcy.Timeouts.UplinkOnly)
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if err := buf.Copy(buf.NewReader(conn), output, buf.UpdateActivity(timer)); err != nil {
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return newError("failed to process response").Base(err)
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}
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return nil
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}
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if err := task.Run(task.WithContext(ctx), task.Parallel(requestDone, task.Single(responseDone, task.OnSuccess(task.Close(output)))))(); 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((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
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return New(ctx, config.(*Config))
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}))
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}
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