clash/adapter/outboundgroup/relay.go

191 lines
4.6 KiB
Go

package outboundgroup
import (
"context"
"encoding/json"
"fmt"
"github.com/Dreamacro/clash/adapter/outbound"
"github.com/Dreamacro/clash/component/dialer"
C "github.com/Dreamacro/clash/constant"
"github.com/Dreamacro/clash/constant/provider"
)
type Relay struct {
*GroupBase
}
// DialContext implements C.ProxyAdapter
func (r *Relay) DialContext(ctx context.Context, metadata *C.Metadata, opts ...dialer.Option) (C.Conn, error) {
proxies, chainProxies := r.proxies(metadata, true)
switch len(proxies) {
case 0:
return outbound.NewDirect().DialContext(ctx, metadata, r.Base.DialOptions(opts...)...)
case 1:
return proxies[0].DialContext(ctx, metadata, r.Base.DialOptions(opts...)...)
}
first := proxies[0]
last := proxies[len(proxies)-1]
c, err := dialer.DialContext(ctx, "tcp", first.Addr(), r.Base.DialOptions(opts...)...)
if err != nil {
return nil, fmt.Errorf("%s connect error: %w", first.Addr(), err)
}
tcpKeepAlive(c)
var currentMeta *C.Metadata
for _, proxy := range proxies[1:] {
currentMeta, err = addrToMetadata(proxy.Addr())
if err != nil {
return nil, err
}
c, err = first.StreamConn(c, currentMeta)
if err != nil {
return nil, fmt.Errorf("%s connect error: %w", first.Addr(), err)
}
first = proxy
}
c, err = last.StreamConn(c, metadata)
if err != nil {
return nil, fmt.Errorf("%s connect error: %w", last.Addr(), err)
}
conn := outbound.NewConn(c, last)
for i := len(chainProxies) - 2; i >= 0; i-- {
conn.AppendToChains(chainProxies[i])
}
conn.AppendToChains(r)
return conn, nil
}
// ListenPacketContext implements C.ProxyAdapter
func (r *Relay) ListenPacketContext(ctx context.Context, metadata *C.Metadata, opts ...dialer.Option) (_ C.PacketConn, err error) {
proxies, chainProxies := r.proxies(metadata, true)
switch len(proxies) {
case 0:
return outbound.NewDirect().ListenPacketContext(ctx, metadata, r.Base.DialOptions(opts...)...)
case 1:
return proxies[0].ListenPacketContext(ctx, metadata, r.Base.DialOptions(opts...)...)
}
first := proxies[0]
last := proxies[len(proxies)-1]
c, err := dialer.DialContext(ctx, "tcp", first.Addr(), r.Base.DialOptions(opts...)...)
if err != nil {
return nil, fmt.Errorf("%s connect error: %w", first.Addr(), err)
}
tcpKeepAlive(c)
var currentMeta *C.Metadata
for _, proxy := range proxies[1:] {
currentMeta, err = addrToMetadata(proxy.Addr())
if err != nil {
return nil, err
}
c, err = first.StreamConn(c, currentMeta)
if err != nil {
return nil, fmt.Errorf("%s connect error: %w", first.Addr(), err)
}
first = proxy
}
c, err = last.StreamConn(c, metadata)
if err != nil {
return nil, fmt.Errorf("%s connect error: %w", last.Addr(), err)
}
var pc C.PacketConn
pc, err = last.ListenPacketOnStreamConn(c, metadata)
if err != nil {
return nil, fmt.Errorf("%s connect error: %w", first.Addr(), err)
}
for i := len(chainProxies) - 2; i >= 0; i-- {
pc.AppendToChains(chainProxies[i])
}
pc.AppendToChains(r)
return pc, nil
}
// SupportUDP implements C.ProxyAdapter
func (r *Relay) SupportUDP() bool {
proxies, _ := r.proxies(nil, false)
if len(proxies) == 0 { // C.Direct
return true
}
last := proxies[len(proxies)-1]
return last.SupportUDP() && last.SupportUOT()
}
// MarshalJSON implements C.ProxyAdapter
func (r *Relay) MarshalJSON() ([]byte, error) {
all := []string{}
for _, proxy := range r.GetProxies(false) {
all = append(all, proxy.Name())
}
return json.Marshal(map[string]any{
"type": r.Type().String(),
"all": all,
})
}
func (r *Relay) proxies(metadata *C.Metadata, touch bool) ([]C.Proxy, []C.Proxy) {
rawProxies := r.GetProxies(touch)
var proxies []C.Proxy
var chainProxies []C.Proxy
var targetProxies []C.Proxy
for n, proxy := range rawProxies {
proxies = append(proxies, proxy)
chainProxies = append(chainProxies, proxy)
subproxy := proxy.Unwrap(metadata)
for subproxy != nil {
chainProxies = append(chainProxies, subproxy)
proxies[n] = subproxy
subproxy = subproxy.Unwrap(metadata)
}
}
for _, proxy := range proxies {
if proxy.Type() != C.Direct && proxy.Type() != C.Compatible {
targetProxies = append(targetProxies, proxy)
}
}
return targetProxies, chainProxies
}
func (r *Relay) Addr() string {
proxies, _ := r.proxies(nil, true)
return proxies[len(proxies)-1].Addr()
}
func NewRelay(option *GroupCommonOption, providers []provider.ProxyProvider) *Relay {
return &Relay{
GroupBase: NewGroupBase(GroupBaseOption{
outbound.BaseOption{
Name: option.Name,
Type: C.Relay,
Interface: option.Interface,
RoutingMark: option.RoutingMark,
},
"",
providers,
}),
}
}