probelabs/goreplay · error

Not implemented

Error message

Not implemented

What it means

Non-Linux stub in internal/capture: newAfpacketHandle and afpacketComputeSize have no implementation off Linux and always return this placeholder error, so requesting afpacket capture there fails at handle creation.

Source

Thrown at internal/capture/af_packet.go:14

//go:build !linux

package capture

import (
	"fmt"
	"time"

	"github.com/google/gopacket"
)

func newAfpacketHandle(device string, snaplen int, block_size int, num_blocks int,
	useVLAN bool, timeout time.Duration) (*afpacketHandle, error) {
	return nil, fmt.Errorf("Not implemented")
}

func afpacketComputeSize(targetSizeMb int, snaplen int, pageSize int) (
	frameSize int, blockSize int, numBlocks int, err error) {
	return 0, 0, 0, fmt.Errorf("Not implemented")
}

type afpacketHandle struct{}

// ReadPacketData satisfies PacketDataSource interface
func (h *afpacketHandle) ReadPacketData() (data []byte, ci gopacket.CaptureInfo, err error) {
	return nil, gopacket.CaptureInfo{}, fmt.Errorf("Not implemented")
}

// SetBPFFilter translates a BPF filter string into BPF RawInstruction and applies them.
func (h *afpacketHandle) SetBPFFilter(filter string, snaplen int) (err error) {
	return fmt.Errorf("Not implemented")
}

View on GitHub (pinned to 251e45abd2)

Solutions

1. Run capture on Linux where AF_PACKET is implemented
2. Fall back to the pcap capture engine on macOS/BSD
3. Don't construct afpacket handles on unsupported GOOS

When it happens

Trigger: Thrown at internal/capture/af_packet.go:14 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of probelabs/goreplay@251e45abd2 (2026-09-02). Data as JSON: /api/errors/800684fd60823e3f. Report an issue: GitHub.