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pcap_lookupnet(3)                                    pcap_lookupnet(3)




NAME

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


SYNOPSIS

       #include <pcap/pcap.h>

       char errbuf[PCAP_ERRBUF_SIZE];

       pcap_lookupnet(3) 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(3)



                                 25 July 2018            pcap_lookupnet(3)

libpcap 1.10.0 - Generated Thu Dec 31 09:34:47 CST 2020
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