NAME

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

SYNOPSIS

       #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);

DESCRIPTION

       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.

RETURN VALUE

       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.

SEE ALSO

       pcap(3PCAP)

                                           25 July 2018                     PCAP_LOOKUPNET(3PCAP)