Manpages - pcap_offline_filter.3pcap

pcap_offline_filter - check whether a filter matches a packet

  #include <pcap/pcap.h>
  int pcap_offline_filter(const struct bpf_program *fp,
  const struct pcap_pkthdr *h, const u_char *pkt)

*pcap_offline_filter*() checks whether a filter matches a packet. fp is a pointer to a bpf_program struct, usually the result of a call to *pcap_compile*(3PCAP). h points to the pcap_pkthdr structure for the packet, and pkt points to the data in the packet.

*pcap_offline_filter*() returns the return value of the filter program. This will be zero if the packet doesn’t match the filter and non-zero if the packet matches the filter.

*pcap*(3PCAP)