pcap_lookupnet(3pcap) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | SEE ALSO | COLOPHON

PCAP_LOOKUPNET(3PCAP)                              PCAP_LOOKUPNET(3PCAP)

NAME         top

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

SYNOPSIS         top

       #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         top

       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         top

       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         top

       pcap(3PCAP)

COLOPHON         top

       This page is part of the libpcap (packet capture library)
       project.  Information about the project can be found at 
       ⟨http://www.tcpdump.org/⟩.  If you have a bug report for this
       manual page, see ⟨http://www.tcpdump.org/#patches⟩.  This page
       was obtained from the project's upstream Git repository
       ⟨https://github.com/the-tcpdump-group/libpcap.git⟩ on 2021-04-01.
       (At that time, the date of the most recent commit that was found
       in the repository was 2021-03-31.)  If you discover any rendering
       problems in this HTML version of the page, or you believe there
       is a better or more up-to-date source for the page, or you have
       corrections or improvements to the information in this COLOPHON
       (which is not part of the original manual page), send a mail to
       man-pages@man7.org

                              25 July 2018         PCAP_LOOKUPNET(3PCAP)