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.TH PCAP_LOOKUPNET 3PCAP "25 July 2018"

.SH NAME

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

.SH SYNOPSIS

.nf

.ft B

#include <pcap/pcap.h>

.ft

.LP

.nf

.ft B

char errbuf[PCAP_ERRBUF_SIZE];

.ft

.LP

.ft B

int pcap_lookupnet(const char *device, bpf_u_int32 *netp,

.ti +8

bpf_u_int32 *maskp, char *errbuf);

.ft

.fi

.SH DESCRIPTION

.B pcap_lookupnet()

is used to determine the IPv4 network number and mask

associated with the network device

.IR device .

Both

.I netp

and

.I maskp

are

.I bpf_u_int32

pointers.

.SH RETURN VALUE

.B pcap_lookupnet()

returns 0 on success and

.B PCAP_ERROR

on failure. If

.B PCAP_ERROR

is returned,

.I errbuf

is filled in with an appropriate error message.

.I errbuf

is assumed to be able to hold at least

.B PCAP_ERRBUF_SIZE

chars.

.SH SEE ALSO

pcap(3PCAP)