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freedom.go
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freedom.go
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package freedom
//go:generate go run $GOPATH/src/v2ray.com/core/common/errors/errorgen/main.go -pkg freedom -path Proxy,Freedom
import (
"context"
"time"
"v2ray.com/core"
"v2ray.com/core/common"
"v2ray.com/core/common/buf"
"v2ray.com/core/common/dice"
"v2ray.com/core/common/net"
"v2ray.com/core/common/retry"
"v2ray.com/core/common/signal"
"v2ray.com/core/proxy"
"v2ray.com/core/transport/internet"
"v2ray.com/core/transport/ray"
)
// Handler handles Freedom connections.
type Handler struct {
policyManager core.PolicyManager
dns core.DNSClient
config Config
}
// New creates a new Freedom handler.
func New(ctx context.Context, config *Config) (*Handler, error) {
v := core.FromContext(ctx)
if v == nil {
return nil, newError("V is not found in context.")
}
f := &Handler{
config: *config,
policyManager: v.PolicyManager(),
dns: v.DNSClient(),
}
return f, nil
}
func (h *Handler) policy() core.Policy {
p := h.policyManager.ForLevel(h.config.UserLevel)
if h.config.Timeout > 0 && h.config.UserLevel == 0 {
p.Timeouts.ConnectionIdle = time.Duration(h.config.Timeout) * time.Second
}
return p
}
func (h *Handler) resolveIP(ctx context.Context, domain string) net.Address {
if resolver, ok := proxy.ResolvedIPsFromContext(ctx); ok {
ips := resolver.Resolve()
if len(ips) == 0 {
return nil
}
return ips[dice.Roll(len(ips))]
}
ips, err := h.dns.LookupIP(domain)
if err != nil {
newError("failed to get IP address for domain ", domain).Base(err).WriteToLog()
}
if len(ips) == 0 {
return nil
}
return net.IPAddress(ips[dice.Roll(len(ips))])
}
// Process implements proxy.Outbound.
func (h *Handler) Process(ctx context.Context, outboundRay ray.OutboundRay, dialer proxy.Dialer) error {
destination, _ := proxy.TargetFromContext(ctx)
if h.config.DestinationOverride != nil {
server := h.config.DestinationOverride.Server
destination = net.Destination{
Network: destination.Network,
Address: server.Address.AsAddress(),
Port: net.Port(server.Port),
}
}
newError("opening connection to ", destination).WriteToLog()
input := outboundRay.OutboundInput()
output := outboundRay.OutboundOutput()
if h.config.DomainStrategy == Config_USE_IP && destination.Address.Family().IsDomain() {
ip := h.resolveIP(ctx, destination.Address.Domain())
if ip != nil {
destination = net.Destination{
Network: destination.Network,
Address: ip,
Port: destination.Port,
}
newError("changing destination to ", destination).WriteToLog()
}
}
var conn internet.Connection
err := retry.ExponentialBackoff(5, 100).On(func() error {
rawConn, err := dialer.Dial(ctx, destination)
if err != nil {
return err
}
conn = rawConn
return nil
})
if err != nil {
return newError("failed to open connection to ", destination).Base(err)
}
defer conn.Close()
ctx, cancel := context.WithCancel(ctx)
timer := signal.CancelAfterInactivity(ctx, cancel, h.policy().Timeouts.ConnectionIdle)
requestDone := signal.ExecuteAsync(func() error {
var writer buf.Writer
if destination.Network == net.Network_TCP {
writer = buf.NewWriter(conn)
} else {
writer = buf.NewSequentialWriter(conn)
}
if err := buf.Copy(input, writer, buf.UpdateActivity(timer)); err != nil {
return newError("failed to process request").Base(err)
}
timer.SetTimeout(h.policy().Timeouts.DownlinkOnly)
return nil
})
responseDone := signal.ExecuteAsync(func() error {
defer output.Close()
v2reader := buf.NewReader(conn)
if err := buf.Copy(v2reader, output, buf.UpdateActivity(timer)); err != nil {
return newError("failed to process response").Base(err)
}
timer.SetTimeout(h.policy().Timeouts.UplinkOnly)
return nil
})
if err := signal.ErrorOrFinish2(ctx, requestDone, responseDone); err != nil {
input.CloseError()
output.CloseError()
return newError("connection ends").Base(err)
}
return nil
}
func init() {
common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
return New(ctx, config.(*Config))
}))
}