1 /* -*- Mode: c; tab-width: 8; indent-tabs-mode: 1; c-basic-offset: 8; -*- */
3 * Copyright (c) 1993, 1994, 1995, 1996, 1997
4 * The Regents of the University of California. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 * must display the following acknowledgement:
16 * This product includes software developed by the Computer Systems
17 * Engineering Group at Lawrence Berkeley Laboratory.
18 * 4. Neither the name of the University nor of the Laboratory may be used
19 * to endorse or promote products derived from this software without
20 * specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * @(#) $Header: /tcpdump/master/libpcap/pcap.h,v 1.34 2001/12/09 05:10:03 guy Exp $ (LBL)
42 #include <sys/types.h>
53 #define PCAP_VERSION_MAJOR 2
54 #define PCAP_VERSION_MINOR 4
56 #define PCAP_ERRBUF_SIZE 256
59 * Compatibility for systems that have a bpf.h that
60 * predates the bpf typedefs for 64-bit support.
62 #if BPF_RELEASE - 0 < 199406
63 typedef int bpf_int32;
64 typedef u_int bpf_u_int32;
67 typedef struct pcap pcap_t;
68 typedef struct pcap_dumper pcap_dumper_t;
69 typedef struct pcap_if pcap_if_t;
70 typedef struct pcap_addr pcap_addr_t;
73 * The first record in the file contains saved values for some
74 * of the flags used in the printout phases of tcpdump.
75 * Many fields here are 32 bit ints so compilers won't insert unwanted
76 * padding; these files need to be interchangeable across architectures.
78 * Do not change the layout of this structure, in any way (this includes
79 * changes that only affect the length of fields in this structure).
81 * Also, do not change the interpretation of any of the members of this
82 * structure, in any way (this includes using values other than
83 * LINKTYPE_ values, as defined in "savefile.c", in the "linktype"
88 * introduce a new structure for the new format, if the layout
89 * of the structure changed;
91 * send mail to "tcpdump-workers@tcpdump.org", requesting a new
92 * magic number for your new capture file format, and, when
93 * you get the new magic number, put it in "savefile.c";
95 * use that magic number for save files with the changed file
98 * make the code in "savefile.c" capable of reading files with
99 * the old file header as well as files with the new file header
100 * (using the magic number to determine the header format).
102 * Then supply the changes to "patches@tcpdump.org", so that future
103 * versions of libpcap and programs that use it (such as tcpdump) will
104 * be able to read your new capture file format.
106 struct pcap_file_header {
108 u_short version_major;
109 u_short version_minor;
110 bpf_int32 thiszone; /* gmt to local correction */
111 bpf_u_int32 sigfigs; /* accuracy of timestamps */
112 bpf_u_int32 snaplen; /* max length saved portion of each pkt */
113 bpf_u_int32 linktype; /* data link type (LINKTYPE_*) */
117 * Each packet in the dump file is prepended with this generic header.
118 * This gets around the problem of different headers for different
122 struct timeval ts; /* time stamp */
123 bpf_u_int32 caplen; /* length of portion present */
124 bpf_u_int32 len; /* length this packet (off wire) */
128 * As returned by the pcap_stats()
131 u_int ps_recv; /* number of packets received */
132 u_int ps_drop; /* number of packets dropped */
133 u_int ps_ifdrop; /* drops by interface XXX not yet supported */
137 * Item in a list of interfaces.
140 struct pcap_if *next;
141 char *name; /* name to hand to "pcap_open_live()" */
142 char *description; /* textual description of interface, or NULL */
143 struct pcap_addr *addresses;
144 u_int flags; /* PCAP_IF_ interface flags */
147 #define PCAP_IF_LOOPBACK 0x00000001 /* interface is loopback */
150 * Representation of an interface address.
153 struct pcap_addr *next;
154 struct sockaddr *addr; /* address */
155 struct sockaddr *netmask; /* netmask for that address */
156 struct sockaddr *broadaddr; /* broadcast address for that address */
157 struct sockaddr *dstaddr; /* P2P destination address for that address */
160 typedef void (*pcap_handler)(u_char *, const struct pcap_pkthdr *,
163 char *pcap_lookupdev(char *);
164 int pcap_lookupnet(char *, bpf_u_int32 *, bpf_u_int32 *, char *);
165 pcap_t *pcap_open_live(char *, int, int, int, char *);
166 pcap_t *pcap_open_dead(int, int);
167 pcap_t *pcap_open_offline(const char *, char *);
168 void pcap_close(pcap_t *);
169 int pcap_loop(pcap_t *, int, pcap_handler, u_char *);
170 int pcap_dispatch(pcap_t *, int, pcap_handler, u_char *);
172 pcap_next(pcap_t *, struct pcap_pkthdr *);
173 int pcap_stats(pcap_t *, struct pcap_stat *);
174 int pcap_setfilter(pcap_t *, struct bpf_program *);
175 int pcap_getnonblock(pcap_t *, char *);
176 int pcap_setnonblock(pcap_t *, int, char *);
177 void pcap_perror(pcap_t *, char *);
178 char *pcap_strerror(int);
179 char *pcap_geterr(pcap_t *);
180 int pcap_compile(pcap_t *, struct bpf_program *, char *, int,
182 int pcap_compile_nopcap(int, int, struct bpf_program *,
183 char *, int, bpf_u_int32);
184 void pcap_freecode(struct bpf_program *);
185 int pcap_datalink(pcap_t *);
186 int pcap_snapshot(pcap_t *);
187 int pcap_is_swapped(pcap_t *);
188 int pcap_major_version(pcap_t *);
189 int pcap_minor_version(pcap_t *);
192 FILE *pcap_file(pcap_t *);
193 int pcap_fileno(pcap_t *);
195 pcap_dumper_t *pcap_dump_open(pcap_t *, const char *);
196 void pcap_dump_close(pcap_dumper_t *);
197 void pcap_dump(u_char *, const struct pcap_pkthdr *, const u_char *);
199 int pcap_findalldevs(pcap_if_t **, char *);
200 void pcap_freealldevs(pcap_if_t *);
202 /* XXX this guy lives in the bpf tree */
203 u_int bpf_filter(struct bpf_insn *, u_char *, u_int, u_int);
204 int bpf_validate(struct bpf_insn *f, int len);
205 char *bpf_image(struct bpf_insn *, int);
206 void bpf_dump(struct bpf_program *, int);