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by Kimmo Suominen.
Based on man-cgi by Panagiotis Christias.
pcap_lookupnet - find the IPv4 network number and netmask for a device
int pcap_lookupnet(const char *device, bpf_u_int32 *netp,
bpf_u_int32 *maskp, char *errbuf);
pcap_lookupnet() is used to determine the IPv4 network number and mask
associated with the network device device. Both netp and maskp are
pcap_lookupnet() returns 0 on success and PCAP_ERROR on failure. If
PCAP_ERROR is returned, errbuf is filled in with an appropriate error
message. errbuf is assumed to be able to hold at least
25 July 2018 PCAP_LOOKUPNET(3)