1 /* -*- Mode: c; tab-width: 8; indent-tabs-mode: 1; c-basic-offset: 8; -*- */ 2 /* 3 * Copyright (c) 1993, 1994, 1995, 1996, 1997 4 * The Regents of the University of California. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 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. 21 * 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 32 * SUCH DAMAGE. 33 * 34 * @(#) $Header: /tcpdump/master/libpcap/pcap.h,v 1.34 2001/12/09 05:10:03 guy Exp $ (LBL) 35 * 36 * $FreeBSD$ 37 */ 38 39 #ifndef lib_pcap_h 40 #define lib_pcap_h 41 42 #include <sys/types.h> 43 #include <sys/time.h> 44 45 #include <net/bpf.h> 46 47 #include <stdio.h> 48 49 #ifdef __cplusplus 50 extern "C" { 51 #endif 52 53 #define PCAP_VERSION_MAJOR 2 54 #define PCAP_VERSION_MINOR 4 55 56 #define PCAP_ERRBUF_SIZE 256 57 58 /* 59 * Compatibility for systems that have a bpf.h that 60 * predates the bpf typedefs for 64-bit support. 61 */ 62 #if BPF_RELEASE - 0 < 199406 63 typedef int bpf_int32; 64 typedef u_int bpf_u_int32; 65 #endif 66 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; 71 72 /* 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. 77 * 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). 80 * 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" 84 * field). 85 * 86 * Instead: 87 * 88 * introduce a new structure for the new format, if the layout 89 * of the structure changed; 90 * 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"; 94 * 95 * use that magic number for save files with the changed file 96 * header; 97 * 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). 101 * 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. 105 */ 106 struct pcap_file_header { 107 bpf_u_int32 magic; 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_*) */ 114 }; 115 116 /* 117 * Each packet in the dump file is prepended with this generic header. 118 * This gets around the problem of different headers for different 119 * packet interfaces. 120 */ 121 struct pcap_pkthdr { 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) */ 125 }; 126 127 /* 128 * As returned by the pcap_stats() 129 */ 130 struct pcap_stat { 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 */ 134 }; 135 136 /* 137 * Item in a list of interfaces. 138 */ 139 struct pcap_if { 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 */ 145 }; 146 147 #define PCAP_IF_LOOPBACK 0x00000001 /* interface is loopback */ 148 149 /* 150 * Representation of an interface address. 151 */ 152 struct pcap_addr { 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 */ 158 }; 159 160 typedef void (*pcap_handler)(u_char *, const struct pcap_pkthdr *, 161 const u_char *); 162 163 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 *); 171 const 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, 181 bpf_u_int32); 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 *); 190 191 /* XXX */ 192 FILE *pcap_file(pcap_t *); 193 int pcap_fileno(pcap_t *); 194 195 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 *); 198 199 int pcap_findalldevs(pcap_if_t **, char *); 200 void pcap_freealldevs(pcap_if_t *); 201 202 /* 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); 207 208 #ifdef __cplusplus 209 } 210 #endif 211 212 #endif 213