mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-12-22 18:17:52 -05:00
156 lines
4.0 KiB
Go
156 lines
4.0 KiB
Go
package freedom
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//go:generate go run $GOPATH/src/v2ray.com/core/tools/generrorgen/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/app"
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"v2ray.com/core/app/dns"
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"v2ray.com/core/app/log"
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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/signal"
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"v2ray.com/core/proxy"
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"v2ray.com/core/transport/internet"
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"v2ray.com/core/transport/ray"
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)
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// Handler handles Freedom connections.
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type Handler struct {
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domainStrategy Config_DomainStrategy
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timeout uint32
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dns dns.Server
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destOverride *DestinationOverride
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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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space := app.SpaceFromContext(ctx)
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if space == nil {
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return nil, newError("no space in context")
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}
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f := &Handler{
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domainStrategy: config.DomainStrategy,
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timeout: config.Timeout,
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destOverride: config.DestinationOverride,
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}
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space.OnInitialize(func() error {
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if config.DomainStrategy == Config_USE_IP {
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f.dns = dns.FromSpace(space)
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if f.dns == nil {
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return newError("DNS server is not found in the space")
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}
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}
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return nil
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})
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return f, nil
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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 := h.dns.Get(domain)
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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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// Process implements proxy.Outbound.
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func (h *Handler) Process(ctx context.Context, outboundRay ray.OutboundRay, dialer proxy.Dialer) error {
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destination, _ := proxy.TargetFromContext(ctx)
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if h.destOverride != nil {
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server := h.destOverride.Server
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destination = net.Destination{
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Network: destination.Network,
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Address: server.Address.AsAddress(),
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Port: net.Port(server.Port),
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}
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}
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log.Trace(newError("opening connection to ", destination))
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input := outboundRay.OutboundInput()
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output := outboundRay.OutboundOutput()
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if h.domainStrategy == Config_USE_IP && destination.Address.Family().IsDomain() {
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ip := h.resolveIP(ctx, destination.Address.Domain())
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if ip != nil {
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destination = net.Destination{
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Network: destination.Network,
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Address: ip,
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Port: destination.Port,
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}
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log.Trace(newError("changing destination to ", destination))
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}
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}
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var conn internet.Connection
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err := retry.ExponentialBackoff(5, 100).On(func() error {
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rawConn, err := dialer.Dial(ctx, destination)
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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()
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timeout := time.Second * time.Duration(h.timeout)
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if timeout == 0 {
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timeout = time.Minute * 5
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}
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ctx, cancel := context.WithCancel(ctx)
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timer := signal.CancelAfterInactivity(ctx, cancel, timeout)
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requestDone := signal.ExecuteAsync(func() error {
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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.NewSequentialWriter(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 := signal.ExecuteAsync(func() error {
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defer output.Close()
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v2reader := buf.NewReader(conn)
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if err := buf.Copy(v2reader, 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 := signal.ErrorOrFinish2(ctx, requestDone, responseDone); err != nil {
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input.CloseError()
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output.CloseError()
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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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