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 * $FreeBSD$ 34 * @(#) $Header: /tcpdump/master/libpcap/pcap-int.h,v 1.55.2.4 2003/12/15 01:42:24 guy Exp $ (LBL) 35 */ 36 37 #ifndef pcap_int_h 38 #define pcap_int_h 39 40 #ifdef __cplusplus 41 extern "C" { 42 #endif 43 44 #include <pcap.h> 45 46 #ifdef WIN32 47 #include <packet32.h> 48 #endif /* WIN32 */ 49 50 /* 51 * Savefile 52 */ 53 typedef enum { 54 NOT_SWAPPED, 55 SWAPPED, 56 MAYBE_SWAPPED 57 } swapped_type_t; 58 59 struct pcap_sf { 60 FILE *rfile; 61 int swapped; 62 int hdrsize; 63 swapped_type_t lengths_swapped; 64 int version_major; 65 int version_minor; 66 u_char *base; 67 }; 68 69 struct pcap_md { 70 struct pcap_stat stat; 71 /*XXX*/ 72 int use_bpf; /* using kernel filter */ 73 u_long TotPkts; /* can't oflow for 79 hrs on ether */ 74 u_long TotAccepted; /* count accepted by filter */ 75 u_long TotDrops; /* count of dropped packets */ 76 long TotMissed; /* missed by i/f during this run */ 77 long OrigMissed; /* missed by i/f before this run */ 78 #ifdef linux 79 int sock_packet; /* using Linux 2.0 compatible interface */ 80 int timeout; /* timeout specified to pcap_open_live */ 81 int clear_promisc; /* must clear promiscuous mode when we close */ 82 int cooked; /* using SOCK_DGRAM rather than SOCK_RAW */ 83 int lo_ifindex; /* interface index of the loopback device */ 84 char *device; /* device name */ 85 struct pcap *next; /* list of open promiscuous sock_packet pcaps */ 86 #endif 87 88 #ifdef HAVE_DAG_API 89 void *dag_mem_base; /* DAG card memory base address */ 90 u_int dag_mem_bottom; /* DAG card current memory bottom pointer */ 91 u_int dag_mem_top; /* DAG card current memory top pointer */ 92 int dag_fcs_bits; /* Number of checksum bits from link layer */ 93 int dag_offset_flags; /* Flags to pass to dag_offset(). */ 94 #endif 95 }; 96 97 struct pcap { 98 #ifdef WIN32 99 ADAPTER *adapter; 100 LPPACKET Packet; 101 int timeout; 102 int nonblock; 103 #else 104 int fd; 105 int selectable_fd; 106 #endif /* WIN32 */ 107 int snapshot; 108 int linktype; 109 int tzoff; /* timezone offset */ 110 int offset; /* offset for proper alignment */ 111 112 int break_loop; /* flag set to force break from packet-reading loop */ 113 114 struct pcap_sf sf; 115 struct pcap_md md; 116 117 /* 118 * Read buffer. 119 */ 120 int bufsize; 121 u_char *buffer; 122 u_char *bp; 123 int cc; 124 125 /* 126 * Place holder for pcap_next(). 127 */ 128 u_char *pkt; 129 130 /* 131 * Methods. 132 */ 133 int (*read_op)(pcap_t *, int cnt, pcap_handler, u_char *); 134 int (*setfilter_op)(pcap_t *, struct bpf_program *); 135 int (*set_datalink_op)(pcap_t *, int); 136 int (*getnonblock_op)(pcap_t *, char *); 137 int (*setnonblock_op)(pcap_t *, int, char *); 138 int (*stats_op)(pcap_t *, struct pcap_stat *); 139 void (*close_op)(pcap_t *); 140 141 /* 142 * Placeholder for filter code if bpf not in kernel. 143 */ 144 struct bpf_program fcode; 145 146 char errbuf[PCAP_ERRBUF_SIZE + 1]; 147 int dlt_count; 148 int *dlt_list; 149 150 struct pcap_pkthdr pcap_header; /* This is needed for the pcap_next_ex() to work */ 151 }; 152 153 /* 154 * This is a timeval as stored in disk in a dumpfile. 155 * It has to use the same types everywhere, independent of the actual 156 * `struct timeval' 157 */ 158 159 struct pcap_timeval { 160 bpf_int32 tv_sec; /* seconds */ 161 bpf_int32 tv_usec; /* microseconds */ 162 }; 163 164 /* 165 * How a `pcap_pkthdr' is actually stored in the dumpfile. 166 * 167 * Do not change the format of this structure, in any way (this includes 168 * changes that only affect the length of fields in this structure), 169 * and do not make the time stamp anything other than seconds and 170 * microseconds (e.g., seconds and nanoseconds). Instead: 171 * 172 * introduce a new structure for the new format; 173 * 174 * send mail to "tcpdump-workers@tcpdump.org", requesting a new 175 * magic number for your new capture file format, and, when 176 * you get the new magic number, put it in "savefile.c"; 177 * 178 * use that magic number for save files with the changed record 179 * header; 180 * 181 * make the code in "savefile.c" capable of reading files with 182 * the old record header as well as files with the new record header 183 * (using the magic number to determine the header format). 184 * 185 * Then supply the changes to "patches@tcpdump.org", so that future 186 * versions of libpcap and programs that use it (such as tcpdump) will 187 * be able to read your new capture file format. 188 */ 189 190 struct pcap_sf_pkthdr { 191 struct pcap_timeval ts; /* time stamp */ 192 bpf_u_int32 caplen; /* length of portion present */ 193 bpf_u_int32 len; /* length this packet (off wire) */ 194 }; 195 196 /* 197 * How a `pcap_pkthdr' is actually stored in dumpfiles written 198 * by some patched versions of libpcap (e.g. the ones in Red 199 * Hat Linux 6.1 and 6.2). 200 * 201 * Do not change the format of this structure, in any way (this includes 202 * changes that only affect the length of fields in this structure). 203 * Instead, introduce a new structure, as per the above. 204 */ 205 206 struct pcap_sf_patched_pkthdr { 207 struct pcap_timeval ts; /* time stamp */ 208 bpf_u_int32 caplen; /* length of portion present */ 209 bpf_u_int32 len; /* length this packet (off wire) */ 210 int index; 211 unsigned short protocol; 212 unsigned char pkt_type; 213 }; 214 215 int yylex(void); 216 217 #ifndef min 218 #define min(a, b) ((a) > (b) ? (b) : (a)) 219 #endif 220 221 /* XXX should these be in pcap.h? */ 222 int pcap_offline_read(pcap_t *, int, pcap_handler, u_char *); 223 int pcap_read(pcap_t *, int cnt, pcap_handler, u_char *); 224 225 226 /* 227 * 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 228 * Tru64 UNIX, and NetBSD pad to make everything line up on a nice boundary. 229 */ 230 #if defined(ultrix) || defined(__osf__) || defined(__NetBSD__) 231 #define PCAP_FDDIPAD 3 232 #endif 233 234 #include <stdarg.h> 235 236 /* 237 * Routines that most pcap implementations can use for non-blocking mode. 238 */ 239 #ifndef WIN32 240 int pcap_getnonblock_fd(pcap_t *, char *); 241 int pcap_setnonblock_fd(pcap_t *p, int, char *); 242 #endif 243 244 /* 245 * Internal interfaces for "pcap_findalldevs()". 246 * 247 * "pcap_platform_finddevs()" is a platform-dependent routine to 248 * add devices not found by the "standard" mechanisms (SIOCGIFCONF, 249 * "getifaddrs()", etc.. 250 * 251 * "pcap_add_if()" adds an interface to the list of interfaces. 252 */ 253 int pcap_platform_finddevs(pcap_if_t **, char *); 254 int add_addr_to_iflist(pcap_if_t **, char *, u_int, struct sockaddr *, 255 size_t, struct sockaddr *, size_t, struct sockaddr *, size_t, 256 struct sockaddr *, size_t, char *); 257 int pcap_add_if(pcap_if_t **, char *, u_int, const char *, char *); 258 struct sockaddr *dup_sockaddr(struct sockaddr *, size_t); 259 int add_or_find_if(pcap_if_t **, pcap_if_t **, const char *, u_int, 260 const char *, char *); 261 262 #ifdef WIN32 263 char *pcap_win32strerror(void); 264 #endif 265 266 /* XXX */ 267 extern int pcap_fddipad; 268 269 int install_bpf_program(pcap_t *, struct bpf_program *); 270 271 int pcap_strcasecmp(const char *, const char *); 272 273 #ifdef __cplusplus 274 } 275 #endif 276 277 #endif 278