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 1.68.2.6 2005/07/07 06:56:04 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 #ifdef MSDOS 51 #include <fcntl.h> 52 #include <io.h> 53 #endif 54 55 /* 56 * Savefile 57 */ 58 typedef enum { 59 NOT_SWAPPED, 60 SWAPPED, 61 MAYBE_SWAPPED 62 } swapped_type_t; 63 64 struct pcap_sf { 65 FILE *rfile; 66 int swapped; 67 int hdrsize; 68 swapped_type_t lengths_swapped; 69 int version_major; 70 int version_minor; 71 u_char *base; 72 }; 73 74 struct pcap_md { 75 struct pcap_stat stat; 76 /*XXX*/ 77 int use_bpf; /* using kernel filter */ 78 u_long TotPkts; /* can't oflow for 79 hrs on ether */ 79 u_long TotAccepted; /* count accepted by filter */ 80 u_long TotDrops; /* count of dropped packets */ 81 long TotMissed; /* missed by i/f during this run */ 82 long OrigMissed; /* missed by i/f before this run */ 83 char *device; /* device name */ 84 #ifdef linux 85 int sock_packet; /* using Linux 2.0 compatible interface */ 86 int timeout; /* timeout specified to pcap_open_live */ 87 int clear_promisc; /* must clear promiscuous mode when we close */ 88 int cooked; /* using SOCK_DGRAM rather than SOCK_RAW */ 89 int ifindex; /* interface index of device we're bound to */ 90 int lo_ifindex; /* interface index of the loopback device */ 91 struct pcap *next; /* list of open promiscuous sock_packet pcaps */ 92 #endif 93 94 #ifdef HAVE_DAG_API 95 #ifdef HAVE_DAG_STREAMS_API 96 u_char *dag_mem_bottom; /* DAG card current memory bottom pointer */ 97 u_char *dag_mem_top; /* DAG card current memory top pointer */ 98 #else 99 void *dag_mem_base; /* DAG card memory base address */ 100 u_int dag_mem_bottom; /* DAG card current memory bottom offset */ 101 u_int dag_mem_top; /* DAG card current memory top offset */ 102 #endif /* HAVE_DAG_STREAMS_API */ 103 int dag_fcs_bits; /* Number of checksum bits from link layer */ 104 int dag_offset_flags; /* Flags to pass to dag_offset(). */ 105 int dag_stream; /* DAG stream number */ 106 int dag_timeout; /* timeout specified to pcap_open_live. 107 * Same as in linux above, introduce 108 * generally? */ 109 #endif /* HAVE_DAG_API */ 110 }; 111 112 /* 113 * 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 114 * Tru64 UNIX, and NetBSD pad to make everything line up on a nice boundary. 115 */ 116 #if defined(ultrix) || defined(__osf__) || (defined(__NetBSD__) && __NetBSD_Version__ > 106000000) 117 #define PCAP_FDDIPAD 3 118 #endif 119 120 struct pcap { 121 #ifdef WIN32 122 ADAPTER *adapter; 123 LPPACKET Packet; 124 int timeout; 125 int nonblock; 126 #else 127 int fd; 128 int selectable_fd; 129 int send_fd; 130 #endif /* WIN32 */ 131 int snapshot; 132 int linktype; 133 int tzoff; /* timezone offset */ 134 int offset; /* offset for proper alignment */ 135 136 int break_loop; /* flag set to force break from packet-reading loop */ 137 138 #ifdef PCAP_FDDIPAD 139 int fddipad; 140 #endif 141 142 #ifdef MSDOS 143 int inter_packet_wait; /* offline: wait between packets */ 144 void (*wait_proc)(void); /* call proc while waiting */ 145 #endif 146 147 struct pcap_sf sf; 148 struct pcap_md md; 149 150 /* 151 * Read buffer. 152 */ 153 int bufsize; 154 u_char *buffer; 155 u_char *bp; 156 int cc; 157 158 /* 159 * Place holder for pcap_next(). 160 */ 161 u_char *pkt; 162 163 /* We're accepting only packets in this direction/these directions. */ 164 pcap_direction_t direction; 165 166 /* 167 * Methods. 168 */ 169 int (*read_op)(pcap_t *, int cnt, pcap_handler, u_char *); 170 int (*inject_op)(pcap_t *, const void *, size_t); 171 int (*setfilter_op)(pcap_t *, struct bpf_program *); 172 int (*setdirection_op)(pcap_t *, pcap_direction_t); 173 int (*set_datalink_op)(pcap_t *, int); 174 int (*getnonblock_op)(pcap_t *, char *); 175 int (*setnonblock_op)(pcap_t *, int, char *); 176 int (*stats_op)(pcap_t *, struct pcap_stat *); 177 void (*close_op)(pcap_t *); 178 179 /* 180 * Placeholder for filter code if bpf not in kernel. 181 */ 182 struct bpf_program fcode; 183 184 char errbuf[PCAP_ERRBUF_SIZE + 1]; 185 int dlt_count; 186 u_int *dlt_list; 187 188 struct pcap_pkthdr pcap_header; /* This is needed for the pcap_next_ex() to work */ 189 }; 190 191 /* 192 * This is a timeval as stored in disk in a dumpfile. 193 * It has to use the same types everywhere, independent of the actual 194 * `struct timeval' 195 */ 196 197 struct pcap_timeval { 198 bpf_int32 tv_sec; /* seconds */ 199 bpf_int32 tv_usec; /* microseconds */ 200 }; 201 202 /* 203 * How a `pcap_pkthdr' is actually stored in the dumpfile. 204 * 205 * Do not change the format of this structure, in any way (this includes 206 * changes that only affect the length of fields in this structure), 207 * and do not make the time stamp anything other than seconds and 208 * microseconds (e.g., seconds and nanoseconds). Instead: 209 * 210 * introduce a new structure for the new format; 211 * 212 * send mail to "tcpdump-workers@tcpdump.org", requesting a new 213 * magic number for your new capture file format, and, when 214 * you get the new magic number, put it in "savefile.c"; 215 * 216 * use that magic number for save files with the changed record 217 * header; 218 * 219 * make the code in "savefile.c" capable of reading files with 220 * the old record header as well as files with the new record header 221 * (using the magic number to determine the header format). 222 * 223 * Then supply the changes to "patches@tcpdump.org", so that future 224 * versions of libpcap and programs that use it (such as tcpdump) will 225 * be able to read your new capture file format. 226 */ 227 228 struct pcap_sf_pkthdr { 229 struct pcap_timeval ts; /* time stamp */ 230 bpf_u_int32 caplen; /* length of portion present */ 231 bpf_u_int32 len; /* length this packet (off wire) */ 232 }; 233 234 /* 235 * How a `pcap_pkthdr' is actually stored in dumpfiles written 236 * by some patched versions of libpcap (e.g. the ones in Red 237 * Hat Linux 6.1 and 6.2). 238 * 239 * Do not change the format of this structure, in any way (this includes 240 * changes that only affect the length of fields in this structure). 241 * Instead, introduce a new structure, as per the above. 242 */ 243 244 struct pcap_sf_patched_pkthdr { 245 struct pcap_timeval ts; /* time stamp */ 246 bpf_u_int32 caplen; /* length of portion present */ 247 bpf_u_int32 len; /* length this packet (off wire) */ 248 int index; 249 unsigned short protocol; 250 unsigned char pkt_type; 251 }; 252 253 int yylex(void); 254 255 #ifndef min 256 #define min(a, b) ((a) > (b) ? (b) : (a)) 257 #endif 258 259 /* XXX should these be in pcap.h? */ 260 int pcap_offline_read(pcap_t *, int, pcap_handler, u_char *); 261 int pcap_read(pcap_t *, int cnt, pcap_handler, u_char *); 262 263 #ifndef HAVE_STRLCPY 264 #define strlcpy(x, y, z) \ 265 (strncpy((x), (y), (z)), \ 266 ((z) <= 0 ? 0 : ((x)[(z) - 1] = '\0')), \ 267 strlen((y))) 268 #endif 269 270 #include <stdarg.h> 271 272 /* 273 * Routines that most pcap implementations can use for non-blocking mode. 274 */ 275 #if !defined(WIN32) && !defined(MSDOS) 276 int pcap_getnonblock_fd(pcap_t *, char *); 277 int pcap_setnonblock_fd(pcap_t *p, int, char *); 278 #endif 279 280 void pcap_close_common(pcap_t *); 281 282 /* 283 * Internal interfaces for "pcap_findalldevs()". 284 * 285 * "pcap_platform_finddevs()" is a platform-dependent routine to 286 * add devices not found by the "standard" mechanisms (SIOCGIFCONF, 287 * "getifaddrs()", etc.. 288 * 289 * "pcap_add_if()" adds an interface to the list of interfaces. 290 */ 291 int pcap_platform_finddevs(pcap_if_t **, char *); 292 int add_addr_to_iflist(pcap_if_t **, const char *, u_int, struct sockaddr *, 293 size_t, struct sockaddr *, size_t, struct sockaddr *, size_t, 294 struct sockaddr *, size_t, char *); 295 int pcap_add_if(pcap_if_t **, const char *, u_int, const char *, char *); 296 struct sockaddr *dup_sockaddr(struct sockaddr *, size_t); 297 int add_or_find_if(pcap_if_t **, pcap_if_t **, const char *, u_int, 298 const char *, char *); 299 300 #ifdef WIN32 301 char *pcap_win32strerror(void); 302 #endif 303 304 int install_bpf_program(pcap_t *, struct bpf_program *); 305 306 int pcap_strcasecmp(const char *, const char *); 307 308 #ifdef __cplusplus 309 } 310 #endif 311 312 #endif 313