sing-box/common/sniff/sniff.go
2023-08-24 21:53:06 +08:00

63 lines
1.6 KiB
Go

package sniff
import (
"bytes"
"context"
"io"
"net"
"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, timeout time.Duration, sniffers ...StreamSniffer) (*adapter.InboundContext, error) {
if timeout == 0 {
timeout = C.ReadPayloadTimeout
}
deadline := time.Now().Add(timeout)
var errors []error
for i := 0; i < 3; i++ {
err := conn.SetReadDeadline(deadline)
if err != nil {
return nil, E.Cause(err, "set read deadline")
}
_, err = buffer.ReadOnceFrom(conn)
err = E.Errors(err, conn.SetReadDeadline(time.Time{}))
if err != nil {
if i > 0 {
break
}
return nil, E.Cause(err, "read payload")
}
for _, sniffer := range sniffers {
metadata, err := sniffer(ctx, bytes.NewReader(buffer.Bytes()))
if metadata != nil {
return metadata, nil
}
errors = append(errors, err)
}
}
return nil, E.Errors(errors...)
}
func PeekPacket(ctx context.Context, packet []byte, sniffers ...PacketSniffer) (*adapter.InboundContext, error) {
var errors []error
for _, sniffer := range sniffers {
metadata, err := sniffer(ctx, packet)
if metadata != nil {
return metadata, nil
}
errors = append(errors, err)
}
return nil, E.Errors(errors...)
}