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| Original file line number | Diff line number | Diff line change |
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@@ -4,7 +4,7 @@ import ( | |
| "context" | ||
| "net" | ||
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| "github.com/sagernet/tfo-go" | ||
| "github.com/metacubex/tfo-go" | ||
| ) | ||
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| var ( | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,159 @@ | ||
| package outbound | ||
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| import ( | ||
| "context" | ||
| "net" | ||
| "time" | ||
|
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| N "github.com/metacubex/mihomo/common/net" | ||
| "github.com/metacubex/mihomo/common/pool" | ||
| "github.com/metacubex/mihomo/component/dialer" | ||
| "github.com/metacubex/mihomo/component/resolver" | ||
| C "github.com/metacubex/mihomo/constant" | ||
| "github.com/metacubex/mihomo/log" | ||
| ) | ||
|
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| type Dns struct { | ||
| *Base | ||
| } | ||
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| type DnsOption struct { | ||
| BasicOption | ||
| Name string `proxy:"name"` | ||
| } | ||
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| // DialContext implements C.ProxyAdapter | ||
| func (d *Dns) DialContext(ctx context.Context, metadata *C.Metadata, opts ...dialer.Option) (C.Conn, error) { | ||
| left, right := N.Pipe() | ||
| go resolver.RelayDnsConn(context.Background(), right, 0) | ||
| return NewConn(left, d), nil | ||
| } | ||
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| // ListenPacketContext implements C.ProxyAdapter | ||
| func (d *Dns) ListenPacketContext(ctx context.Context, metadata *C.Metadata, opts ...dialer.Option) (C.PacketConn, error) { | ||
| log.Debugln("[DNS] hijack udp:%s from %s", metadata.RemoteAddress(), metadata.SourceAddrPort()) | ||
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| ctx, cancel := context.WithCancel(context.Background()) | ||
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| return newPacketConn(&dnsPacketConn{ | ||
| response: make(chan dnsPacket, 1), | ||
| ctx: ctx, | ||
| cancel: cancel, | ||
| }, d), nil | ||
| } | ||
|
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| type dnsPacket struct { | ||
| data []byte | ||
| put func() | ||
| addr net.Addr | ||
| } | ||
|
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| // dnsPacketConn implements net.PacketConn | ||
| type dnsPacketConn struct { | ||
| response chan dnsPacket | ||
| ctx context.Context | ||
| cancel context.CancelFunc | ||
| } | ||
|
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| func (d *dnsPacketConn) WaitReadFrom() (data []byte, put func(), addr net.Addr, err error) { | ||
| select { | ||
| case packet := <-d.response: | ||
| return packet.data, packet.put, packet.addr, nil | ||
| case <-d.ctx.Done(): | ||
| return nil, nil, nil, net.ErrClosed | ||
| } | ||
| } | ||
|
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| func (d *dnsPacketConn) ReadFrom(p []byte) (n int, addr net.Addr, err error) { | ||
| select { | ||
| case packet := <-d.response: | ||
| n = copy(p, packet.data) | ||
| if packet.put != nil { | ||
| packet.put() | ||
| } | ||
| return n, packet.addr, nil | ||
| case <-d.ctx.Done(): | ||
| return 0, nil, net.ErrClosed | ||
| } | ||
| } | ||
|
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| func (d *dnsPacketConn) WriteTo(p []byte, addr net.Addr) (n int, err error) { | ||
| select { | ||
| case <-d.ctx.Done(): | ||
| return 0, net.ErrClosed | ||
| default: | ||
| } | ||
|
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| if len(p) > resolver.SafeDnsPacketSize { | ||
| // wtf??? | ||
| return len(p), nil | ||
| } | ||
|
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| ctx, cancel := context.WithTimeout(d.ctx, resolver.DefaultDnsRelayTimeout) | ||
| defer cancel() | ||
|
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| buf := pool.Get(resolver.SafeDnsPacketSize) | ||
| put := func() { _ = pool.Put(buf) } | ||
| copy(buf, p) // avoid p be changed after WriteTo returned | ||
|
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| go func() { // don't block the WriteTo function | ||
| buf, err = resolver.RelayDnsPacket(ctx, buf[:len(p)], buf) | ||
| if err != nil { | ||
| put() | ||
| return | ||
| } | ||
|
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| packet := dnsPacket{ | ||
| data: buf, | ||
| put: put, | ||
| addr: addr, | ||
| } | ||
| select { | ||
| case d.response <- packet: | ||
| break | ||
| case <-d.ctx.Done(): | ||
| put() | ||
| } | ||
| }() | ||
| return len(p), nil | ||
| } | ||
|
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| func (d *dnsPacketConn) Close() error { | ||
| d.cancel() | ||
| return nil | ||
| } | ||
|
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| func (*dnsPacketConn) LocalAddr() net.Addr { | ||
| return &net.UDPAddr{ | ||
| IP: net.IPv4(127, 0, 0, 1), | ||
| Port: 53, | ||
| Zone: "", | ||
| } | ||
| } | ||
|
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| func (*dnsPacketConn) SetDeadline(t time.Time) error { | ||
| return nil | ||
| } | ||
|
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| func (*dnsPacketConn) SetReadDeadline(t time.Time) error { | ||
| return nil | ||
| } | ||
|
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| func (*dnsPacketConn) SetWriteDeadline(t time.Time) error { | ||
| return nil | ||
| } | ||
|
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| func NewDnsWithOption(option DnsOption) *Dns { | ||
| return &Dns{ | ||
| Base: &Base{ | ||
| name: option.Name, | ||
| tp: C.Dns, | ||
| udp: true, | ||
| tfo: option.TFO, | ||
| mpTcp: option.MPTCP, | ||
| iface: option.Interface, | ||
| rmark: option.RoutingMark, | ||
| prefer: C.NewDNSPrefer(option.IPVersion), | ||
| }, | ||
| } | ||
| } |
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