1 /* $OpenBSD: pcap.h,v 1.14 2006/03/26 20:58:51 djm Exp $ */ 2 3 /* 4 * Copyright (c) 1993, 1994, 1995, 1996, 1997 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the Computer Systems 18 * Engineering Group at Lawrence Berkeley Laboratory. 19 * 4. Neither the name of the University nor of the Laboratory may be used 20 * to endorse or promote products derived from this software without 21 * specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#) $Header: /home/cvs/src/lib/libpcap/pcap.h,v 1.14 2006/03/26 20:58:51 djm 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 #define PCAP_VERSION_MAJOR 2 49 #define PCAP_VERSION_MINOR 4 50 51 #define PCAP_ERRBUF_SIZE 256 52 53 /* 54 * Compatibility for systems that have a bpf.h that 55 * predates the bpf typedefs for 64-bit support. 56 */ 57 #if BPF_RELEASE - 0 < 199406 58 typedef int bpf_int32; 59 typedef u_int bpf_u_int32; 60 #endif 61 62 typedef struct pcap pcap_t; 63 typedef struct pcap_if pcap_if_t; 64 typedef struct pcap_addr pcap_addr_t; 65 typedef struct pcap_dumper pcap_dumper_t; 66 67 /* 68 * The first record in the file contains saved values for some 69 * of the flags used in the printout phases of tcpdump. 70 * Many fields here are 32 bit ints so compilers won't insert unwanted 71 * padding; these files need to be interchangeable across architectures. 72 */ 73 struct pcap_file_header { 74 bpf_u_int32 magic; 75 u_short version_major; 76 u_short version_minor; 77 bpf_int32 thiszone; /* gmt to local correction */ 78 bpf_u_int32 sigfigs; /* accuracy of timestamps */ 79 bpf_u_int32 snaplen; /* max length saved portion of each pkt */ 80 bpf_u_int32 linktype; /* data link type (DLT_*) */ 81 }; 82 83 typedef enum { 84 PCAP_D_INOUT = 0, 85 PCAP_D_IN, 86 PCAP_D_OUT 87 } pcap_direction_t; 88 89 /* 90 * Each packet in the dump file is prepended with this generic header. 91 * This gets around the problem of different headers for different 92 * packet interfaces. 93 */ 94 struct pcap_pkthdr { 95 struct bpf_timeval ts; /* time stamp */ 96 bpf_u_int32 caplen; /* length of portion present */ 97 bpf_u_int32 len; /* length this packet (off wire) */ 98 }; 99 100 /* 101 * As returned by the pcap_stats() 102 */ 103 struct pcap_stat { 104 u_int ps_recv; /* number of packets received */ 105 u_int ps_drop; /* number of packets dropped */ 106 u_int ps_ifdrop; /* drops by interface XXX not yet supported */ 107 }; 108 109 /* 110 * Item in a list of interfaces. 111 */ 112 struct pcap_if { 113 struct pcap_if *next; 114 char *name; /* name to hand to "pcap_open_live()" */ 115 char *description; /* textual description of interface, or NULL */ 116 struct pcap_addr *addresses; 117 bpf_u_int32 flags; /* PCAP_IF_ interface flags */ 118 }; 119 120 #define PCAP_IF_LOOPBACK 0x00000001 /* interface is loopback */ 121 122 /* 123 * Representation of an interface address. 124 */ 125 struct pcap_addr { 126 struct pcap_addr *next; 127 struct sockaddr *addr; /* address */ 128 struct sockaddr *netmask; /* netmask for that address */ 129 struct sockaddr *broadaddr; /* broadcast address for that address */ 130 struct sockaddr *dstaddr; /* P2P destination address for that address */ 131 }; 132 133 typedef void (*pcap_handler)(u_char *, const struct pcap_pkthdr *, 134 const u_char *); 135 136 __BEGIN_DECLS 137 char *pcap_lookupdev(char *); 138 int pcap_lookupnet(const char *, bpf_u_int32 *, bpf_u_int32 *, char *); 139 pcap_t *pcap_open_live(const char *, int, int, int, char *); 140 pcap_t *pcap_open_dead(int, int); 141 pcap_t *pcap_open_offline(const char *, char *); 142 pcap_t *pcap_fopen_offline(FILE *, char *); 143 void pcap_close(pcap_t *); 144 int pcap_loop(pcap_t *, int, pcap_handler, u_char *); 145 int pcap_dispatch(pcap_t *, int, pcap_handler, u_char *); 146 const u_char* 147 pcap_next(pcap_t *, struct pcap_pkthdr *); 148 int pcap_next_ex(pcap_t *, struct pcap_pkthdr **, const u_char **); 149 void pcap_breakloop(pcap_t *); 150 int pcap_stats(pcap_t *, struct pcap_stat *); 151 int pcap_setfilter(pcap_t *, struct bpf_program *); 152 int pcap_setdirection(pcap_t *, pcap_direction_t); 153 int pcap_getnonblock(pcap_t *, char *); 154 int pcap_setnonblock(pcap_t *, int, char *); 155 void pcap_perror(pcap_t *, char *); 156 int pcap_inject(pcap_t *, const void *, size_t); 157 int pcap_sendpacket(pcap_t *, const u_char *, int); 158 char *pcap_strerror(int); 159 char *pcap_geterr(pcap_t *); 160 int pcap_compile(pcap_t *, struct bpf_program *, char *, int, 161 bpf_u_int32); 162 int pcap_compile_nopcap(int, int, struct bpf_program *, 163 char *, int, bpf_u_int32); 164 void pcap_freecode(struct bpf_program *); 165 int pcap_datalink(pcap_t *); 166 int pcap_list_datalinks(pcap_t *, int **); 167 int pcap_set_datalink(pcap_t *, int); 168 int pcap_datalink_name_to_val(const char *); 169 const char *pcap_datalink_val_to_name(int); 170 const char *pcap_datalink_val_to_description(int); 171 int pcap_snapshot(pcap_t *); 172 int pcap_is_swapped(pcap_t *); 173 int pcap_major_version(pcap_t *); 174 int pcap_minor_version(pcap_t *); 175 176 /* XXX */ 177 FILE *pcap_file(pcap_t *); 178 int pcap_fileno(pcap_t *); 179 180 pcap_dumper_t *pcap_dump_open(pcap_t *, const char *); 181 pcap_dumper_t *pcap_dump_fopen(pcap_t *, FILE *fp); 182 FILE *pcap_dump_file(pcap_dumper_t *); 183 long pcap_dump_ftell(pcap_dumper_t *); 184 int pcap_dump_flush(pcap_dumper_t *); 185 void pcap_dump_close(pcap_dumper_t *); 186 void pcap_dump(u_char *, const struct pcap_pkthdr *, const u_char *); 187 188 int pcap_findalldevs(pcap_if_t **, char *); 189 void pcap_freealldevs(pcap_if_t *); 190 191 const char *pcap_lib_version(void); 192 193 /* XXX this guy lives in the bpf tree */ 194 u_int bpf_filter(struct bpf_insn *, u_char *, u_int, u_int); 195 char *bpf_image(struct bpf_insn *, int); 196 197 int pcap_get_selectable_fd(pcap_t *); 198 199 __END_DECLS 200 #endif 201