Allow to compile pcap filters to BPF #21
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This allows to compile filters to BPF instructions like libpcap allows. See the added test for an example.
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libpcap has a filter language (
pcap-filter(7)) that it can compile into BPF instructions. With this PR,pcap_compile(3)gets exposed. Additionally,pcap_open_dead(3)gets exposed, which allows to open a fakePcapthat can be used to compile the filters without having to open a real interface of the system.This allows to compile pcap filters to BPF instructions. See the added test for an usage example.