sing-box/common/sniff/sniff.go
2022-07-26 12:48:10 +08:00

53 lines
1.3 KiB
Go

package sniff
import (
"bytes"
"context"
"io"
"net"
"os"
"time"
"github.com/sagernet/sing-box/adapter"
C "github.com/sagernet/sing-box/constant"
"github.com/sagernet/sing/common/buf"
E "github.com/sagernet/sing/common/exceptions"
)
type (
StreamSniffer = func(ctx context.Context, reader io.Reader) (*adapter.InboundContext, error)
PacketSniffer = func(ctx context.Context, packet []byte) (*adapter.InboundContext, error)
)
func PeekStream(ctx context.Context, conn net.Conn, buffer *buf.Buffer, sniffers ...StreamSniffer) (*adapter.InboundContext, error) {
err := conn.SetReadDeadline(time.Now().Add(C.ReadPayloadTimeout))
if err != nil {
return nil, err
}
_, err = buffer.ReadOnceFrom(conn)
err = E.Errors(err, conn.SetReadDeadline(time.Time{}))
if err != nil {
return nil, err
}
var metadata *adapter.InboundContext
for _, sniffer := range sniffers {
metadata, err = sniffer(ctx, bytes.NewReader(buffer.Bytes()))
if err != nil {
continue
}
return metadata, nil
}
return nil, os.ErrInvalid
}
func PeekPacket(ctx context.Context, packet []byte, sniffers ...PacketSniffer) (*adapter.InboundContext, error) {
for _, sniffer := range sniffers {
sniffMetadata, err := sniffer(ctx, packet)
if err != nil {
continue
}
return sniffMetadata, nil
}
return nil, os.ErrInvalid
}