pcap.h revision 38151
1/* 2 * Copyright (c) 1993, 1994, 1995, 1996 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the Computer Systems 16 * Engineering Group at Lawrence Berkeley Laboratory. 17 * 4. Neither the name of the University nor of the Laboratory may be used 18 * to endorse or promote products derived from this software without 19 * specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#) $Header: pcap.h,v 1.20 96/07/12 19:24:15 leres Exp $ (LBL) 34 */ 35 36#ifndef lib_pcap_h 37#define lib_pcap_h 38 39#include <sys/types.h> 40#include <sys/time.h> 41 42#include <net/bpf.h> 43 44#include <stdio.h> 45 46#ifdef __cplusplus 47extern "C" { 48#endif 49 50 51#define PCAP_VERSION_MAJOR 2 52#define PCAP_VERSION_MINOR 4 53 54#define PCAP_ERRBUF_SIZE 256 55 56/* 57 * Compatibility for systems that have a bpf.h that 58 * predates the bpf typedefs for 64-bit support. 59 */ 60#if BPF_RELEASE - 0 < 199406 61typedef int bpf_int32; 62typedef u_int bpf_u_int32; 63#endif 64 65typedef struct pcap pcap_t; 66typedef struct pcap_dumper pcap_dumper_t; 67 68/* 69 * The first record in the file contains saved values for some 70 * of the flags used in the printout phases of tcpdump. 71 * Many fields here are 32 bit ints so compilers won't insert unwanted 72 * padding; these files need to be interchangeable across architectures. 73 */ 74struct pcap_file_header { 75 bpf_u_int32 magic; 76 u_short version_major; 77 u_short version_minor; 78 bpf_int32 thiszone; /* gmt to local correction */ 79 bpf_u_int32 sigfigs; /* accuracy of timestamps */ 80 bpf_u_int32 snaplen; /* max length saved portion of each pkt */ 81 bpf_u_int32 linktype; /* data link type (DLT_*) */ 82}; 83 84/* 85 * Each packet in the dump file is prepended with this generic header. 86 * This gets around the problem of different headers for different 87 * packet interfaces. 88 */ 89struct pcap_pkthdr { 90 struct timeval ts; /* time stamp */ 91 bpf_u_int32 caplen; /* length of portion present */ 92 bpf_u_int32 len; /* length this packet (off wire) */ 93}; 94 95/* 96 * As returned by the pcap_stats() 97 */ 98struct pcap_stat { 99 u_int ps_recv; /* number of packets received */ 100 u_int ps_drop; /* number of packets dropped */ 101 u_int ps_ifdrop; /* drops by interface XXX not yet supported */ 102}; 103 104typedef void (*pcap_handler)(u_char *, const struct pcap_pkthdr *, 105 const u_char *); 106 107char *pcap_lookupdev(char *); 108int pcap_lookupnet(char *, bpf_u_int32 *, bpf_u_int32 *, char *); 109pcap_t *pcap_open_live(char *, int, int, int, char *); 110pcap_t *pcap_open_offline(char *, char *); 111void pcap_close(pcap_t *); 112int pcap_loop(pcap_t *, int, pcap_handler, u_char *); 113int pcap_dispatch(pcap_t *, int, pcap_handler, u_char *); 114const u_char* 115 pcap_next(pcap_t *, struct pcap_pkthdr *); 116int pcap_stats(pcap_t *, struct pcap_stat *); 117int pcap_setfilter(pcap_t *, struct bpf_program *); 118void pcap_perror(pcap_t *, char *); 119char *pcap_strerror(int); 120char *pcap_geterr(pcap_t *); 121int pcap_compile(pcap_t *, struct bpf_program *, char *, int, 122 bpf_u_int32); 123/* XXX */ 124int pcap_freecode(pcap_t *, struct bpf_program *); 125int pcap_datalink(pcap_t *); 126int pcap_snapshot(pcap_t *); 127int pcap_is_swapped(pcap_t *); 128int pcap_major_version(pcap_t *); 129int pcap_minor_version(pcap_t *); 130 131/* XXX */ 132FILE *pcap_file(pcap_t *); 133int pcap_fileno(pcap_t *); 134 135pcap_dumper_t *pcap_dump_open(pcap_t *, char *); 136void pcap_dump_close(pcap_dumper_t *); 137void pcap_dump(u_char *, const struct pcap_pkthdr *, const u_char *); 138 139/* XXX this guy lives in the bpf tree */ 140u_int bpf_filter(struct bpf_insn *, u_char *, u_int, u_int); 141char *bpf_image(struct bpf_insn *, int); 142 143#ifdef __cplusplus 144} 145#endif 146 147 148#endif 149