package freedom
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//go:generate go run github.com/v2fly/v2ray-core/v5/common/errors/errorgen
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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/dice"
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"github.com/v2fly/v2ray-core/v5/common/net"
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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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)
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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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h := new(Handler)
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if err := core.RequireFeatures(ctx, func(pm policy.Manager, d dns.Client) error {
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return h.Init(config.(*Config), pm, d)
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}); err != nil {
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return nil, err
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}
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return h, nil
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}))
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common.Must(common.RegisterConfig((*SimplifiedConfig)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
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simplifiedServer := config.(*SimplifiedConfig)
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_ = simplifiedServer
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fullConfig := &Config{}
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return common.CreateObject(ctx, fullConfig)
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}))
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}
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// Handler handles Freedom connections.
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type Handler struct {
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policyManager policy.Manager
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dns dns.Client
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config *Config
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}
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// Init initializes the Handler with necessary parameters.
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func (h *Handler) Init(config *Config, pm policy.Manager, d dns.Client) error {
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h.config = config
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h.policyManager = pm
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h.dns = d
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return nil
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}
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func (h *Handler) policy() policy.Session {
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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, localAddr net.Address) net.Address {
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if c, ok := h.dns.(dns.ClientWithIPOption); ok {
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c.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 := h.dns.LookupIP
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if h.config.DomainStrategy == Config_USE_IP4 || (localAddr != nil && localAddr.Family().IsIPv4()) {
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if lookupIPv4, ok := h.dns.(dns.IPv4Lookup); ok {
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lookupFunc = lookupIPv4.LookupIPv4
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}
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} else if h.config.DomainStrategy == Config_USE_IP6 || (localAddr != nil && localAddr.Family().IsIPv6()) {
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if lookupIPv6, ok := h.dns.(dns.IPv6Lookup); ok {
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lookupFunc = lookupIPv6.LookupIPv6
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}
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}
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ips, err := lookupFunc(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 *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 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.useIP() && dialDest.Address.Family().IsDomain() {
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ip := h.resolveIP(ctx, dialDest.Address.Domain(), dialer.Address())
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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 ", 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()
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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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var reader buf.Reader
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if destination.Network == net.Network_TCP {
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reader = buf.NewReader(conn)
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} else {
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reader = buf.NewPacketReader(conn)
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}
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if err := buf.Copy(reader, 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(ctx, requestDone, task.OnSuccess(responseDone, 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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