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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_COMPILE 3PCAP "1 December 2009"
21 .SH NAME
22 pcap_compile \- compile a filter expression
23 .SH SYNOPSIS
24 .nf
25 .ft B
26 #include <pcap/pcap.h>
27 .ft
28 .LP
29 .ft B
30 int pcap_compile(pcap_t *p, struct bpf_program *fp,
31 .ti +8
32 const char *str, int optimize, bpf_u_int32 netmask);
33 .ft
34 .fi
35 .SH DESCRIPTION
36 .B pcap_compile()
37 is used to compile the string
38 .I str
39 into a filter program. See
40 .BR pcap-filter (@MAN_MISC_INFO@)
41 for the syntax of that string.
42 .I program
43 is a pointer to a
44 .I bpf_program
45 struct and is filled in by
46 .BR pcap_compile() .
47 .I optimize
48 controls whether optimization on the resulting code is performed.
49 .I netmask
50 specifies the IPv4 netmask of the network on which packets are being
51 captured; it is used only when checking for IPv4 broadcast addresses in
52 the filter program. If the netmask of the network on which packets are
53 being captured isn't known to the program, or if packets are being
54 captured on the Linux "any" pseudo-interface that can capture on more
55 than one network, a value of PCAP_NETMASK_UNKNOWN can be supplied; tests
56 for IPv4 broadcast addresses will fail to compile, but all other tests in
57 the filter program will be OK.
58 .SH RETURN VALUE
59 .B pcap_compile()
60 returns 0 on success and \-1 on failure.
61 If \-1 is returned,
62 .B pcap_geterr()
63 or
64 .B pcap_perror()
65 may be called with
66 .I p
67 as an argument to fetch or display the error text.
68 .SH SEE ALSO
69 pcap(3PCAP), pcap_setfilter(3PCAP), pcap_freecode(3PCAP),
70 pcap_geterr(3PCAP), pcap-filter(@MAN_MISC_INFO@)