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Fix BPF filter when listen on all interfaces
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It was caching bpf filter of first interface
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buger committed Jul 6, 2021
1 parent 92c63de commit a727ade
Showing 1 changed file with 7 additions and 5 deletions.
12 changes: 7 additions & 5 deletions capture/capture.go
Original file line number Diff line number Diff line change
Expand Up @@ -284,14 +284,16 @@ func (l *Listener) PcapHandle(ifi pcap.Interface) (handle *pcap.Handle, err erro
if err != nil {
return nil, fmt.Errorf("PCAP Activate device error: %q, interface: %q", err, ifi.Name)
}
if l.BPFFilter == "" {
l.BPFFilter = l.Filter(ifi)

bpfFilter := l.BPFFilter
if bpfFilter == "" {
bpfFilter = l.Filter(ifi)
}
fmt.Println("Interface:", ifi.Name, ". BPF Filter:", l.BPFFilter)
err = handle.SetBPFFilter(l.BPFFilter)
fmt.Println("Interface:", ifi.Name, ". BPF Filter:", bpfFilter)
err = handle.SetBPFFilter(bpfFilter)
if err != nil {
handle.Close()
return nil, fmt.Errorf("BPF filter error: %q%s, interface: %q", err, l.BPFFilter, ifi.Name)
return nil, fmt.Errorf("BPF filter error: %q%s, interface: %q", err, bpfFilter, ifi.Name)
}
return
}
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