2009-03-21 20:43:56 +00:00
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.\" Copyright (c) 1994, 1996, 1997
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" modification, are permitted provided that: (1) source code distributions
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.\" retain the above copyright notice and this paragraph in its entirety, (2)
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.\" distributions including binary code include the above copyright notice and
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.\" this paragraph in its entirety in the documentation or other materials
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.\" provided with the distribution, and (3) all advertising materials mentioning
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.\" features or use of this software display the following acknowledgement:
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.\" ``This product includes software developed by the University of California,
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.\" Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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.\" the University nor the names of its contributors may be used to endorse
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.\" or promote products derived from this software without specific prior
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.\" written permission.
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.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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.\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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.\"
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2017-02-12 07:04:44 +00:00
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.TH PCAP_LOOKUPNET 3PCAP "3 January 2014"
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2009-03-21 20:43:56 +00:00
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.SH NAME
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pcap_lookupnet \- find the IPv4 network number and netmask for a device
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.SH SYNOPSIS
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.nf
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.ft B
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#include <pcap/pcap.h>
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.ft
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.LP
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.nf
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.ft B
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char errbuf[PCAP_ERRBUF_SIZE];
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.ft
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.LP
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.ft B
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int pcap_lookupnet(const char *device, bpf_u_int32 *netp,
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.ti +8
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bpf_u_int32 *maskp, char *errbuf);
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.ft
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.fi
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.SH DESCRIPTION
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.B pcap_lookupnet()
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is used to determine the IPv4 network number and mask
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associated with the network device
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.IR device .
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Both
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.I netp
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and
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.I maskp
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are
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.I bpf_u_int32
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pointers.
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.SH RETURN VALUE
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.B pcap_lookupnet()
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returns 0 on success and \-1 on failure.
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If \-1 is returned,
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.I errbuf
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is filled in with an appropriate error message.
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.I errbuf
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is assumed to be able to hold at least
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.B PCAP_ERRBUF_SIZE
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chars.
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.SH SEE ALSO
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pcap(3PCAP)
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