1 /* 2 * Copyright (c) 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: /tcpdump/master/libpcap/pcap-int.h,v 1.33 2001/08/24 07:46:52 guy Exp $ (LBL) 34 * 35 * $FreeBSD$ 36 */ 37 38 #ifndef pcap_int_h 39 #define pcap_int_h 40 41 #ifdef __cplusplus 42 extern "C" { 43 #endif 44 45 #include <pcap.h> 46 47 /* 48 * Savefile 49 */ 50 struct pcap_sf { 51 FILE *rfile; 52 int swapped; 53 int hdrsize; 54 int version_major; 55 int version_minor; 56 u_char *base; 57 }; 58 59 struct pcap_md { 60 struct pcap_stat stat; 61 /*XXX*/ 62 int use_bpf; /* using kernel filter */ 63 u_long TotPkts; /* can't oflow for 79 hrs on ether */ 64 u_long TotAccepted; /* count accepted by filter */ 65 u_long TotDrops; /* count of dropped packets */ 66 long TotMissed; /* missed by i/f during this run */ 67 long OrigMissed; /* missed by i/f before this run */ 68 #ifdef linux 69 int sock_packet; /* using Linux 2.0 compatible interface */ 70 int timeout; /* timeout specified to pcap_open_live */ 71 int clear_promisc; /* must clear promiscuous mode when we close */ 72 int cooked; /* using SOCK_DGRAM rather than SOCK_RAW */ 73 int lo_ifindex; /* interface index of the loopback device */ 74 char *device; /* device name */ 75 struct pcap *next; /* list of open promiscuous sock_packet pcaps */ 76 #endif 77 }; 78 79 struct pcap { 80 int fd; 81 int snapshot; 82 int linktype; 83 int tzoff; /* timezone offset */ 84 int offset; /* offset for proper alignment */ 85 86 struct pcap_sf sf; 87 struct pcap_md md; 88 89 /* 90 * Read buffer. 91 */ 92 int bufsize; 93 u_char *buffer; 94 u_char *bp; 95 int cc; 96 97 /* 98 * Place holder for pcap_next(). 99 */ 100 u_char *pkt; 101 102 103 /* 104 * Placeholder for filter code if bpf not in kernel. 105 */ 106 struct bpf_program fcode; 107 108 char errbuf[PCAP_ERRBUF_SIZE]; 109 int dlt_count; 110 int *dlt_list; 111 }; 112 113 /* 114 * This is a timeval as stored in disk in a dumpfile. 115 * It has to use the same types everywhere, independent of the actual 116 * `struct timeval' 117 */ 118 119 struct pcap_timeval { 120 bpf_int32 tv_sec; /* seconds */ 121 bpf_int32 tv_usec; /* microseconds */ 122 }; 123 124 /* 125 * How a `pcap_pkthdr' is actually stored in the dumpfile. 126 * 127 * Do not change the format of this structure, in any way (this includes 128 * changes that only affect the length of fields in this structure), 129 * and do not make the time stamp anything other than seconds and 130 * microseconds (e.g., seconds and nanoseconds). Instead: 131 * 132 * introduce a new structure for the new format; 133 * 134 * send mail to "tcpdump-workers@tcpdump.org", requesting a new 135 * magic number for your new capture file format, and, when 136 * you get the new magic number, put it in "savefile.c"; 137 * 138 * use that magic number for save files with the changed record 139 * header; 140 * 141 * make the code in "savefile.c" capable of reading files with 142 * the old record header as well as files with the new record header 143 * (using the magic number to determine the header format). 144 * 145 * Then supply the changes to "patches@tcpdump.org", so that future 146 * versions of libpcap and programs that use it (such as tcpdump) will 147 * be able to read your new capture file format. 148 */ 149 150 struct pcap_sf_pkthdr { 151 struct pcap_timeval ts; /* time stamp */ 152 bpf_u_int32 caplen; /* length of portion present */ 153 bpf_u_int32 len; /* length this packet (off wire) */ 154 }; 155 156 /* 157 * How a `pcap_pkthdr' is actually stored in dumpfiles written 158 * by some patched versions of libpcap (e.g. the ones in Red 159 * Hat Linux 6.1 and 6.2). 160 * 161 * Do not change the format of this structure, in any way (this includes 162 * changes that only affect the length of fields in this structure). 163 * Instead, introduce a new structure, as per the above. 164 */ 165 166 struct pcap_sf_patched_pkthdr { 167 struct pcap_timeval ts; /* time stamp */ 168 bpf_u_int32 caplen; /* length of portion present */ 169 bpf_u_int32 len; /* length this packet (off wire) */ 170 int index; 171 unsigned short protocol; 172 unsigned char pkt_type; 173 }; 174 175 int yylex(void); 176 177 #ifndef min 178 #define min(a, b) ((a) > (b) ? (b) : (a)) 179 #endif 180 181 /* XXX should these be in pcap.h? */ 182 int pcap_offline_read(pcap_t *, int, pcap_handler, u_char *); 183 int pcap_read(pcap_t *, int cnt, pcap_handler, u_char *); 184 185 /* 186 * Ultrix, DEC OSF/1^H^H^H^H^H^H^H^H^HDigital UNIX^H^H^H^H^H^H^H^H^H^H^H^H 187 * Tru64 UNIX, and NetBSD pad to make everything line up on a nice boundary. 188 */ 189 #if defined(ultrix) || defined(__osf__) || defined(__NetBSD__) 190 #define PCAP_FDDIPAD 3 191 #endif 192 193 #ifndef HAVE_STRLCPY 194 #define strlcpy(x, y, z) \ 195 (strncpy((x), (y), (z)), \ 196 ((z) <= 0 ? 0 : ((x)[(z) - 1] = '\0')), \ 197 strlen((y))) 198 #endif 199 200 #ifdef linux 201 void pcap_close_linux(pcap_t *); 202 #endif 203 204 /* XXX */ 205 extern int pcap_fddipad; 206 207 int install_bpf_program(pcap_t *, struct bpf_program *); 208 209 #ifdef __cplusplus 210 } 211 #endif 212 213 #endif 214