pcap_lookupnet(3) - NetBSD Manual Pages

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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];

       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.  errbuf is a buffer large enough to hold at least
       PCAP_ERRBUF_SIZE chars.

       This function is not available on Windows.  It  supports  neither  IPv6
       nor multiple IPv4 addresses per interface, which obviously is not prac-
       tical in modern networks.  See pcap_findalldevs(3) for a more elaborate
       solution to the problem.


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.


SEE ALSO

       pcap(3)



                                 13 March 2024               PCAP_LOOKUPNET(3)