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1 office 1 .\" Copyright (c) 1994, 1996, 1997
2 .\" The Regents of the University of California. All rights reserved.
3 .\"
4 .\" Redistribution and use in source and binary forms, with or without
5 .\" modification, are permitted provided that: (1) source code distributions
6 .\" retain the above copyright notice and this paragraph in its entirety, (2)
7 .\" distributions including binary code include the above copyright notice and
8 .\" this paragraph in its entirety in the documentation or other materials
9 .\" provided with the distribution, and (3) all advertising materials mentioning
10 .\" features or use of this software display the following acknowledgement:
11 .\" ``This product includes software developed by the University of California,
12 .\" Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
13 .\" the University nor the names of its contributors may be used to endorse
14 .\" or promote products derived from this software without specific prior
15 .\" written permission.
16 .\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
17 .\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
18 .\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
19 .\"
20 .TH PCAP_LOOKUPNET 3PCAP "5 April 2008"
21 .SH NAME
22 pcap_lookupnet \- find the IPv4 network number and netmask for a device
23 .SH SYNOPSIS
24 .nf
25 .ft B
26 #include <pcap/pcap.h>
27 .ft
28 .LP
29 .nf
30 .ft B
31 char errbuf[PCAP_ERRBUF_SIZE];
32 .ft
33 .LP
34 .ft B
35 int pcap_lookupnet(const char *device, bpf_u_int32 *netp,
36 .ti +8
37 bpf_u_int32 *maskp, char *errbuf);
38 .ft
39 .fi
40 .SH DESCRIPTION
41 .B pcap_lookupnet()
42 is used to determine the IPv4 network number and mask
43 associated with the network device
44 .IR device .
45 Both
46 .I netp
47 and
48 .I maskp
49 are
50 .I bpf_u_int32
51 pointers.
52 .SH RETURN VALUE
53 .B pcap_lookupnet()
54 returns 0 on success and \-1 on failure.
55 If \-1 is returned,
56 .I errbuf
57 is filled in with an appropriate error message.
58 .I errbuf
59 is assumed to be able to hold at least
60 .B PCAP_ERRBUF_SIZE
61 chars.
62 .SH SEE ALSO
63 pcap(3PCAP)