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 * $FreeBSD$ 35 * @(#) $Header: /tcpdump/master/libpcap/pcap.h,v 1.45.2.4 2004/01/27 22:56:20 guy Exp $ (LBL) 36 */ 37 38 #ifndef lib_pcap_h 39 #define lib_pcap_h 40 41 #include <sys/types.h> 42 #include <sys/time.h> 43 44 #include <net/bpf.h> 45 46 #include <stdio.h> 47 48 #ifdef __cplusplus 49 extern "C" { 50 #endif 51 52 #define PCAP_VERSION_MAJOR 2 53 #define PCAP_VERSION_MINOR 4 54 55 #define PCAP_ERRBUF_SIZE 256 56 57 /* 58 * Compatibility for systems that have a bpf.h that 59 * predates the bpf typedefs for 64-bit support. 60 */ 61 #if BPF_RELEASE - 0 < 199406 62 typedef int bpf_int32; 63 typedef u_int bpf_u_int32; 64 #endif 65 66 typedef struct pcap pcap_t; 67 typedef struct pcap_dumper pcap_dumper_t; 68 typedef struct pcap_if pcap_if_t; 69 typedef struct pcap_addr pcap_addr_t; 70 71 /* 72 * The first record in the file contains saved values for some 73 * of the flags used in the printout phases of tcpdump. 74 * Many fields here are 32 bit ints so compilers won't insert unwanted 75 * padding; these files need to be interchangeable across architectures. 76 * 77 * Do not change the layout of this structure, in any way (this includes 78 * changes that only affect the length of fields in this structure). 79 * 80 * Also, do not change the interpretation of any of the members of this 81 * structure, in any way (this includes using values other than 82 * LINKTYPE_ values, as defined in "savefile.c", in the "linktype" 83 * field). 84 * 85 * Instead: 86 * 87 * introduce a new structure for the new format, if the layout 88 * of the structure changed; 89 * 90 * send mail to "tcpdump-workers@tcpdump.org", requesting a new 91 * magic number for your new capture file format, and, when 92 * you get the new magic number, put it in "savefile.c"; 93 * 94 * use that magic number for save files with the changed file 95 * header; 96 * 97 * make the code in "savefile.c" capable of reading files with 98 * the old file header as well as files with the new file header 99 * (using the magic number to determine the header format). 100 * 101 * Then supply the changes to "patches@tcpdump.org", so that future 102 * versions of libpcap and programs that use it (such as tcpdump) will 103 * be able to read your new capture file format. 104 */ 105 struct pcap_file_header { 106 bpf_u_int32 magic; 107 u_short version_major; 108 u_short version_minor; 109 bpf_int32 thiszone; /* gmt to local correction */ 110 bpf_u_int32 sigfigs; /* accuracy of timestamps */ 111 bpf_u_int32 snaplen; /* max length saved portion of each pkt */ 112 bpf_u_int32 linktype; /* data link type (LINKTYPE_*) */ 113 }; 114 115 /* 116 * Each packet in the dump file is prepended with this generic header. 117 * This gets around the problem of different headers for different 118 * packet interfaces. 119 */ 120 struct pcap_pkthdr { 121 struct timeval ts; /* time stamp */ 122 bpf_u_int32 caplen; /* length of portion present */ 123 bpf_u_int32 len; /* length this packet (off wire) */ 124 }; 125 126 /* 127 * As returned by the pcap_stats() 128 */ 129 struct pcap_stat { 130 u_int ps_recv; /* number of packets received */ 131 u_int ps_drop; /* number of packets dropped */ 132 u_int ps_ifdrop; /* drops by interface XXX not yet supported */ 133 #ifdef WIN32 134 u_int bs_capt; /* number of packets that reach the application */ 135 #endif /* WIN32 */ 136 }; 137 138 /* 139 * Item in a list of interfaces. 140 */ 141 struct pcap_if { 142 struct pcap_if *next; 143 char *name; /* name to hand to "pcap_open_live()" */ 144 char *description; /* textual description of interface, or NULL */ 145 struct pcap_addr *addresses; 146 bpf_u_int32 flags; /* PCAP_IF_ interface flags */ 147 }; 148 149 #define PCAP_IF_LOOPBACK 0x00000001 /* interface is loopback */ 150 151 /* 152 * Representation of an interface address. 153 */ 154 struct pcap_addr { 155 struct pcap_addr *next; 156 struct sockaddr *addr; /* address */ 157 struct sockaddr *netmask; /* netmask for that address */ 158 struct sockaddr *broadaddr; /* broadcast address for that address */ 159 struct sockaddr *dstaddr; /* P2P destination address for that address */ 160 }; 161 162 typedef void (*pcap_handler)(u_char *, const struct pcap_pkthdr *, 163 const u_char *); 164 165 char *pcap_lookupdev(char *); 166 int pcap_lookupnet(const char *, bpf_u_int32 *, bpf_u_int32 *, char *); 167 pcap_t *pcap_open_live(const char *, int, int, int, char *); 168 pcap_t *pcap_open_dead(int, int); 169 pcap_t *pcap_open_offline(const char *, char *); 170 void pcap_close(pcap_t *); 171 int pcap_loop(pcap_t *, int, pcap_handler, u_char *); 172 int pcap_dispatch(pcap_t *, int, pcap_handler, u_char *); 173 const u_char* 174 pcap_next(pcap_t *, struct pcap_pkthdr *); 175 int pcap_next_ex(pcap_t *, struct pcap_pkthdr **, const u_char **); 176 void pcap_breakloop(pcap_t *); 177 int pcap_stats(pcap_t *, struct pcap_stat *); 178 int pcap_setfilter(pcap_t *, struct bpf_program *); 179 int pcap_getnonblock(pcap_t *, char *); 180 int pcap_setnonblock(pcap_t *, int, char *); 181 void pcap_perror(pcap_t *, char *); 182 char *pcap_strerror(int); 183 char *pcap_geterr(pcap_t *); 184 int pcap_compile(pcap_t *, struct bpf_program *, char *, int, 185 bpf_u_int32); 186 int pcap_compile_nopcap(int, int, struct bpf_program *, 187 char *, int, bpf_u_int32); 188 void pcap_freecode(struct bpf_program *); 189 int pcap_datalink(pcap_t *); 190 int pcap_list_datalinks(pcap_t *, int **); 191 int pcap_set_datalink(pcap_t *, int); 192 int pcap_datalink_name_to_val(const char *); 193 const char *pcap_datalink_val_to_name(int); 194 const char *pcap_datalink_val_to_description(int); 195 int pcap_snapshot(pcap_t *); 196 int pcap_is_swapped(pcap_t *); 197 int pcap_major_version(pcap_t *); 198 int pcap_minor_version(pcap_t *); 199 200 /* XXX */ 201 FILE *pcap_file(pcap_t *); 202 int pcap_fileno(pcap_t *); 203 204 pcap_dumper_t *pcap_dump_open(pcap_t *, const char *); 205 int pcap_dump_flush(pcap_dumper_t *); 206 void pcap_dump_close(pcap_dumper_t *); 207 void pcap_dump(u_char *, const struct pcap_pkthdr *, const u_char *); 208 FILE *pcap_dump_file(pcap_dumper_t *); 209 210 int pcap_findalldevs(pcap_if_t **, char *); 211 void pcap_freealldevs(pcap_if_t *); 212 213 const char *pcap_lib_version(void); 214 215 /* XXX this guy lives in the bpf tree */ 216 u_int bpf_filter(struct bpf_insn *, u_char *, u_int, u_int); 217 int bpf_validate(struct bpf_insn *f, int len); 218 char *bpf_image(struct bpf_insn *, int); 219 void bpf_dump(struct bpf_program *, int); 220 221 #ifdef WIN32 222 /* 223 * Win32 definitions 224 */ 225 226 int pcap_setbuff(pcap_t *p, int dim); 227 int pcap_setmode(pcap_t *p, int mode); 228 int pcap_sendpacket(pcap_t *p, u_char *buf, int size); 229 int pcap_setmintocopy(pcap_t *p, int size); 230 231 #ifdef WPCAP 232 /* Include file with the wpcap-specific extensions */ 233 #include <Win32-Extensions.h> 234 #endif 235 236 #define MODE_CAPT 0 237 #define MODE_STAT 1 238 #define MODE_MON 2 239 240 #else 241 /* 242 * UN*X definitions 243 */ 244 245 int pcap_get_selectable_fd(pcap_t *); 246 247 #endif /* WIN32 */ 248 249 #ifdef __cplusplus 250 } 251 #endif 252 253 #endif 254