Manpages - pcap_lookupnet.3pcap

pcap_lookupnet - find the IPv4 network number and netmask for a device

  #include <pcap/pcap.h>
  char errbuf[PCAP_ERRBUF_SIZE];
  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 bpf_u_int32 pointers.

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 PCAP_ERRBUF_SIZE chars.

*pcap*(3PCAP)