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/pcap1.h,v 1.5 2008-05-30 01:43:21 guy Exp $ (LBL) 35 */ 36 37 #ifndef lib_pcap_h 38 #define lib_pcap_h 39 40 #ifdef WIN32 41 #include <pcap-stdinc.h> 42 #else /* WIN32 */ 43 #include <sys/types.h> 44 #include <sys/time.h> 45 #endif /* WIN32 */ 46 47 #ifndef PCAP_DONT_INCLUDE_PCAP_BPF_H 48 #include <pcap/bpf.h> 49 #endif 50 51 #include <stdio.h> 52 53 #ifdef __cplusplus 54 extern "C" { 55 #endif 56 57 #define PCAP_VERSION_MAJOR 3 58 #define PCAP_VERSION_MINOR 0 59 60 #define PCAP_ERRBUF_SIZE 256 61 62 /* 63 * Compatibility for systems that have a bpf.h that 64 * predates the bpf typedefs for 64-bit support. 65 */ 66 #if BPF_RELEASE - 0 < 199406 67 typedef int bpf_int32; 68 typedef u_int bpf_u_int32; 69 #endif 70 71 typedef struct pcap pcap_t; 72 typedef struct pcap_dumper pcap_dumper_t; 73 typedef struct pcap_if pcap_if_t; 74 typedef struct pcap_addr pcap_addr_t; 75 76 /* 77 * The first record in the file contains saved values for some 78 * of the flags used in the printout phases of tcpdump. 79 * Many fields here are 32 bit ints so compilers won't insert unwanted 80 * padding; these files need to be interchangeable across architectures. 81 * 82 * Do not change the layout of this structure, in any way (this includes 83 * changes that only affect the length of fields in this structure). 84 * 85 * Also, do not change the interpretation of any of the members of this 86 * structure, in any way (this includes using values other than 87 * LINKTYPE_ values, as defined in "savefile.c", in the "linktype" 88 * field). 89 * 90 * Instead: 91 * 92 * introduce a new structure for the new format, if the layout 93 * of the structure changed; 94 * 95 * send mail to "tcpdump-workers@lists.tcpdump.org", requesting 96 * a new magic number for your new capture file format, and, when 97 * you get the new magic number, put it in "savefile.c"; 98 * 99 * use that magic number for save files with the changed file 100 * header; 101 * 102 * make the code in "savefile.c" capable of reading files with 103 * the old file header as well as files with the new file header 104 * (using the magic number to determine the header format). 105 * 106 * Then supply the changes by forking the branch at 107 * 108 * https://github.com/the-tcpdump-group/libpcap/issues 109 * 110 * and issuing a pull request, so that future versions of libpcap and 111 * programs that use it (such as tcpdump) will be able to read your new 112 * capture file format. 113 */ 114 115 enum pcap1_info_types { 116 PCAP_DATACAPTURE, 117 PCAP_TIMESTAMP, 118 PCAP_WALLTIME, 119 PCAP_TIMESKEW, 120 PCAP_PROBEPLACE, /* aka direction */ 121 PCAP_COMMENT, /* comment */ 122 }; 123 124 struct pcap1_info_container { 125 bpf_u_int32 info_len; /* in bytes */ 126 bpf_u_int32 info_type; /* enum pcap1_info_types */ 127 unsigned char info_data[0]; 128 }; 129 130 struct pcap1_info_timestamp { 131 struct pcap1_info_container pic; 132 bpf_u_int32 nanoseconds; /* 10^-9 of seconds */ 133 bpf_u_int32 seconds; /* seconds since Unix epoch - GMT */ 134 bpf_u_int16 macroseconds; /* 16 bits more of MSB of time */ 135 bpf_u_int16 sigfigs; /* accuracy of timestamps - LSB bits */ 136 }; 137 138 struct pcap1_info_packet { 139 struct pcap1_info_container pic; 140 bpf_u_int32 caplen; /* length of portion present */ 141 bpf_u_int32 len; /* length this packet (off wire) */ 142 bpf_u_int32 linktype; /* data link type (LINKTYPE_*) */ 143 bpf_u_int32 ifIndex; /* abstracted interface index */ 144 unsigned char packet_data[0]; 145 }; 146 147 enum pcap1_probe { 148 INBOUND =1, 149 OUTBOUND =2, 150 FORWARD =3, 151 PREENCAP =4, 152 POSTDECAP=5, 153 }; 154 155 struct pcap1_info_probe { 156 struct pcap1_info_container pic; 157 bpf_u_int32 probeloc; /* enum pcap1_probe */ 158 unsigned char probe_desc[0]; 159 }; 160 161 struct pcap1_info_comment { 162 struct pcap1_info_container pic; 163 unsigned char comment[0]; 164 }; 165 166 struct pcap1_packet_header { 167 bpf_u_int32 magic; 168 u_short version_major; 169 u_short version_minor; 170 bpf_u_int32 block_len; 171 struct pcap1_info_container pics[0]; 172 }; 173 174 /* 175 * Each packet in the dump file is prepended with this generic header. 176 * This gets around the problem of different headers for different 177 * packet interfaces. 178 */ 179 180 /* 181 * As returned by the pcap_stats() 182 */ 183 struct pcap_stat { 184 u_int ps_recv; /* number of packets received */ 185 u_int ps_drop; /* number of packets dropped */ 186 u_int ps_ifdrop; /* drops by interface XXX not yet supported */ 187 #ifdef WIN32 188 u_int bs_capt; /* number of packets that reach the application */ 189 #endif /* WIN32 */ 190 }; 191 192 /* 193 * Item in a list of interfaces. 194 */ 195 struct pcap_if { 196 struct pcap_if *next; 197 char *name; /* name to hand to "pcap_open_live()" */ 198 char *description; /* textual description of interface, or NULL */ 199 struct pcap_addr *addresses; 200 bpf_u_int32 flags; /* PCAP_IF_ interface flags */ 201 }; 202 203 #define PCAP_IF_LOOPBACK 0x00000001 /* interface is loopback */ 204 205 /* 206 * Representation of an interface address. 207 */ 208 struct pcap_addr { 209 struct pcap_addr *next; 210 struct sockaddr *addr; /* address */ 211 struct sockaddr *netmask; /* netmask for that address */ 212 struct sockaddr *broadaddr; /* broadcast address for that address */ 213 struct sockaddr *dstaddr; /* P2P destination address for that address */ 214 }; 215 216 typedef void (*pcap_handler)(u_char *, const struct pcap_pkthdr *, 217 const u_char *); 218 219 char *pcap_lookupdev(char *); 220 int pcap_lookupnet(const char *, bpf_u_int32 *, bpf_u_int32 *, char *); 221 pcap_t *pcap_open_live(const char *, int, int, int, char *); 222 pcap_t *pcap_open_dead(int, int); 223 pcap_t *pcap_open_offline(const char *, char *); 224 void pcap_close(pcap_t *); 225 int pcap_loop(pcap_t *, int, pcap_handler, u_char *); 226 int pcap_dispatch(pcap_t *, int, pcap_handler, u_char *); 227 const u_char* 228 pcap_next(pcap_t *, struct pcap_pkthdr *); 229 int pcap_next_ex(pcap_t *, struct pcap_pkthdr **, const u_char **); 230 void pcap_breakloop(pcap_t *); 231 int pcap_stats(pcap_t *, struct pcap_stat *); 232 int pcap_setfilter(pcap_t *, struct bpf_program *); 233 int pcap_getnonblock(pcap_t *, char *); 234 int pcap_setnonblock(pcap_t *, int, char *); 235 void pcap_perror(pcap_t *, char *); 236 char *pcap_strerror(int); 237 char *pcap_geterr(pcap_t *); 238 int pcap_compile(pcap_t *, struct bpf_program *, char *, int, 239 bpf_u_int32); 240 int pcap_compile_nopcap(int, int, struct bpf_program *, 241 char *, int, bpf_u_int32); 242 void pcap_freecode(struct bpf_program *); 243 int pcap_datalink(pcap_t *); 244 int pcap_list_datalinks(pcap_t *, int **); 245 int pcap_set_datalink(pcap_t *, int); 246 int pcap_datalink_name_to_val(const char *); 247 const char *pcap_datalink_val_to_name(int); 248 const char *pcap_datalink_val_to_description(int); 249 int pcap_snapshot(pcap_t *); 250 int pcap_is_swapped(pcap_t *); 251 int pcap_major_version(pcap_t *); 252 int pcap_minor_version(pcap_t *); 253 254 /* XXX */ 255 FILE *pcap_file(pcap_t *); 256 int pcap_fileno(pcap_t *); 257 258 pcap_dumper_t *pcap_dump_open(pcap_t *, const char *); 259 int pcap_dump_flush(pcap_dumper_t *); 260 void pcap_dump_close(pcap_dumper_t *); 261 void pcap_dump(u_char *, const struct pcap_pkthdr *, const u_char *); 262 FILE *pcap_dump_file(pcap_dumper_t *); 263 264 int pcap_findalldevs(pcap_if_t **, char *); 265 void pcap_freealldevs(pcap_if_t *); 266 267 const char *pcap_lib_version(void); 268 269 /* XXX this guy lives in the bpf tree */ 270 u_int bpf_filter(struct bpf_insn *, u_char *, u_int, u_int); 271 int bpf_validate(struct bpf_insn *f, int len); 272 char *bpf_image(struct bpf_insn *, int); 273 void bpf_dump(struct bpf_program *, int); 274 275 #ifdef WIN32 276 /* 277 * Win32 definitions 278 */ 279 280 int pcap_setbuff(pcap_t *p, int dim); 281 int pcap_setmode(pcap_t *p, int mode); 282 int pcap_sendpacket(pcap_t *p, u_char *buf, int size); 283 int pcap_setmintocopy(pcap_t *p, int size); 284 285 #ifdef WPCAP 286 /* Include file with the wpcap-specific extensions */ 287 #include <Win32-Extensions.h> 288 #endif 289 290 #define MODE_CAPT 0 291 #define MODE_STAT 1 292 293 #else 294 /* 295 * UN*X definitions 296 */ 297 298 int pcap_get_selectable_fd(pcap_t *); 299 300 #endif /* WIN32 */ 301 302 #ifdef __cplusplus 303 } 304 #endif 305 306 #endif 307