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 1.68.2.11 2007/06/22 06:43:58 guy Exp $ (LBL) 34 */ 35 36 #ifndef pcap_int_h 37 #define pcap_int_h 38 39 #ifdef __cplusplus 40 extern "C" { 41 #endif 42 43 #include <pcap.h> 44 45 #ifdef WIN32 46 #include <Packet32.h> 47 #endif /* WIN32 */ 48 49 #ifdef MSDOS 50 #include <fcntl.h> 51 #include <io.h> 52 #endif 53 54 /* 55 * Swap byte ordering of unsigned long long timestamp on a big endian 56 * machine. 57 */ 58 #define SWAPLL(ull) ((ull & 0xff00000000000000LL) >> 56) | \ 59 ((ull & 0x00ff000000000000LL) >> 40) | \ 60 ((ull & 0x0000ff0000000000LL) >> 24) | \ 61 ((ull & 0x000000ff00000000LL) >> 8) | \ 62 ((ull & 0x00000000ff000000LL) << 8) | \ 63 ((ull & 0x0000000000ff0000LL) << 24) | \ 64 ((ull & 0x000000000000ff00LL) << 40) | \ 65 ((ull & 0x00000000000000ffLL) << 56) 66 67 /* 68 * Savefile 69 */ 70 typedef enum { 71 NOT_SWAPPED, 72 SWAPPED, 73 MAYBE_SWAPPED 74 } swapped_type_t; 75 76 struct pcap_sf { 77 FILE *rfile; 78 int swapped; 79 int hdrsize; 80 swapped_type_t lengths_swapped; 81 int version_major; 82 int version_minor; 83 u_char *base; 84 }; 85 86 struct pcap_md { 87 struct pcap_stat stat; 88 /*XXX*/ 89 int use_bpf; /* using kernel filter */ 90 u_long TotPkts; /* can't oflow for 79 hrs on ether */ 91 u_long TotAccepted; /* count accepted by filter */ 92 u_long TotDrops; /* count of dropped packets */ 93 long TotMissed; /* missed by i/f during this run */ 94 long OrigMissed; /* missed by i/f before this run */ 95 char *device; /* device name */ 96 #ifdef linux 97 int sock_packet; /* using Linux 2.0 compatible interface */ 98 int timeout; /* timeout specified to pcap_open_live */ 99 int clear_promisc; /* must clear promiscuous mode when we close */ 100 int cooked; /* using SOCK_DGRAM rather than SOCK_RAW */ 101 int ifindex; /* interface index of device we're bound to */ 102 int lo_ifindex; /* interface index of the loopback device */ 103 struct pcap *next; /* list of open promiscuous sock_packet pcaps */ 104 u_int packets_read; /* count of packets read with recvfrom() */ 105 #endif 106 107 #ifdef HAVE_DAG_API 108 #ifdef HAVE_DAG_STREAMS_API 109 u_char *dag_mem_bottom; /* DAG card current memory bottom pointer */ 110 u_char *dag_mem_top; /* DAG card current memory top pointer */ 111 #else 112 void *dag_mem_base; /* DAG card memory base address */ 113 u_int dag_mem_bottom; /* DAG card current memory bottom offset */ 114 u_int dag_mem_top; /* DAG card current memory top offset */ 115 #endif /* HAVE_DAG_STREAMS_API */ 116 int dag_fcs_bits; /* Number of checksum bits from link layer */ 117 int dag_offset_flags; /* Flags to pass to dag_offset(). */ 118 int dag_stream; /* DAG stream number */ 119 int dag_timeout; /* timeout specified to pcap_open_live. 120 * Same as in linux above, introduce 121 * generally? */ 122 #endif /* HAVE_DAG_API */ 123 }; 124 125 /* 126 * 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 127 * Tru64 UNIX, and some versions of NetBSD pad FDDI packets to make everything 128 * line up on a nice boundary. 129 */ 130 #ifdef __NetBSD__ 131 #include <sys/param.h> /* needed to declare __NetBSD_Version__ */ 132 #endif 133 134 #if defined(ultrix) || defined(__osf__) || (defined(__NetBSD__) && __NetBSD_Version__ > 106000000) 135 #define PCAP_FDDIPAD 3 136 #endif 137 138 struct pcap { 139 #ifdef WIN32 140 ADAPTER *adapter; 141 LPPACKET Packet; 142 int timeout; 143 int nonblock; 144 #else 145 int fd; 146 int selectable_fd; 147 int send_fd; 148 #endif /* WIN32 */ 149 int snapshot; 150 int linktype; 151 int tzoff; /* timezone offset */ 152 int offset; /* offset for proper alignment */ 153 154 int break_loop; /* flag set to force break from packet-reading loop */ 155 156 #ifdef PCAP_FDDIPAD 157 int fddipad; 158 #endif 159 160 #ifdef MSDOS 161 int inter_packet_wait; /* offline: wait between packets */ 162 void (*wait_proc)(void); /* call proc while waiting */ 163 #endif 164 165 struct pcap_sf sf; 166 struct pcap_md md; 167 168 /* 169 * Read buffer. 170 */ 171 int bufsize; 172 u_char *buffer; 173 u_char *bp; 174 int cc; 175 176 /* 177 * Place holder for pcap_next(). 178 */ 179 u_char *pkt; 180 181 /* We're accepting only packets in this direction/these directions. */ 182 pcap_direction_t direction; 183 184 /* 185 * Methods. 186 */ 187 int (*read_op)(pcap_t *, int cnt, pcap_handler, u_char *); 188 int (*inject_op)(pcap_t *, const void *, size_t); 189 int (*setfilter_op)(pcap_t *, struct bpf_program *); 190 int (*setdirection_op)(pcap_t *, pcap_direction_t); 191 int (*set_datalink_op)(pcap_t *, int); 192 int (*getnonblock_op)(pcap_t *, char *); 193 int (*setnonblock_op)(pcap_t *, int, char *); 194 int (*stats_op)(pcap_t *, struct pcap_stat *); 195 void (*close_op)(pcap_t *); 196 197 /* 198 * Placeholder for filter code if bpf not in kernel. 199 */ 200 struct bpf_program fcode; 201 202 char errbuf[PCAP_ERRBUF_SIZE + 1]; 203 int dlt_count; 204 u_int *dlt_list; 205 206 struct pcap_pkthdr pcap_header; /* This is needed for the pcap_next_ex() to work */ 207 }; 208 209 /* 210 * This is a timeval as stored in a savefile. 211 * It has to use the same types everywhere, independent of the actual 212 * `struct timeval'; `struct timeval' has 32-bit tv_sec values on some 213 * platforms and 64-bit tv_sec values on other platforms, and writing 214 * out native `struct timeval' values would mean files could only be 215 * read on systems with the same tv_sec size as the system on which 216 * the file was written. 217 */ 218 219 struct pcap_timeval { 220 bpf_int32 tv_sec; /* seconds */ 221 bpf_int32 tv_usec; /* microseconds */ 222 }; 223 224 /* 225 * This is a `pcap_pkthdr' as actually stored in a savefile. 226 * 227 * Do not change the format of this structure, in any way (this includes 228 * changes that only affect the length of fields in this structure), 229 * and do not make the time stamp anything other than seconds and 230 * microseconds (e.g., seconds and nanoseconds). Instead: 231 * 232 * introduce a new structure for the new format; 233 * 234 * send mail to "tcpdump-workers (at) tcpdump.org", requesting a new 235 * magic number for your new capture file format, and, when 236 * you get the new magic number, put it in "savefile.c"; 237 * 238 * use that magic number for save files with the changed record 239 * header; 240 * 241 * make the code in "savefile.c" capable of reading files with 242 * the old record header as well as files with the new record header 243 * (using the magic number to determine the header format). 244 * 245 * Then supply the changes to "patches (at) tcpdump.org", so that future 246 * versions of libpcap and programs that use it (such as tcpdump) will 247 * be able to read your new capture file format. 248 */ 249 250 struct pcap_sf_pkthdr { 251 struct pcap_timeval ts; /* time stamp */ 252 bpf_u_int32 caplen; /* length of portion present */ 253 bpf_u_int32 len; /* length this packet (off wire) */ 254 }; 255 256 /* 257 * How a `pcap_pkthdr' is actually stored in savefiles written 258 * by some patched versions of libpcap (e.g. the ones in Red 259 * Hat Linux 6.1 and 6.2). 260 * 261 * Do not change the format of this structure, in any way (this includes 262 * changes that only affect the length of fields in this structure). 263 * Instead, introduce a new structure, as per the above. 264 */ 265 266 struct pcap_sf_patched_pkthdr { 267 struct pcap_timeval ts; /* time stamp */ 268 bpf_u_int32 caplen; /* length of portion present */ 269 bpf_u_int32 len; /* length this packet (off wire) */ 270 int index; 271 unsigned short protocol; 272 unsigned char pkt_type; 273 }; 274 275 int yylex(void); 276 277 #ifndef min 278 #define min(a, b) ((a) > (b) ? (b) : (a)) 279 #endif 280 281 /* XXX should these be in pcap.h? */ 282 int pcap_offline_read(pcap_t *, int, pcap_handler, u_char *); 283 int pcap_read(pcap_t *, int cnt, pcap_handler, u_char *); 284 285 #ifndef HAVE_STRLCPY 286 #define strlcpy(x, y, z) \ 287 (strncpy((x), (y), (z)), \ 288 ((z) <= 0 ? 0 : ((x)[(z) - 1] = '\0')), \ 289 strlen((y))) 290 #endif 291 292 #include <stdarg.h> 293 294 #if !defined(HAVE_SNPRINTF) 295 #define snprintf pcap_snprintf 296 extern int snprintf (char *, size_t, const char *, ...); 297 #endif 298 299 #if !defined(HAVE_VSNPRINTF) 300 #define vsnprintf pcap_vsnprintf 301 extern int vsnprintf (char *, size_t, const char *, va_list ap); 302 #endif 303 304 /* 305 * Routines that most pcap implementations can use for non-blocking mode. 306 */ 307 #if !defined(WIN32) && !defined(MSDOS) 308 int pcap_getnonblock_fd(pcap_t *, char *); 309 int pcap_setnonblock_fd(pcap_t *p, int, char *); 310 #endif 311 312 void pcap_close_common(pcap_t *); 313 314 /* 315 * Internal interfaces for "pcap_findalldevs()". 316 * 317 * "pcap_platform_finddevs()" is a platform-dependent routine to 318 * add devices not found by the "standard" mechanisms (SIOCGIFCONF, 319 * "getifaddrs()", etc.. 320 * 321 * "pcap_add_if()" adds an interface to the list of interfaces. 322 */ 323 int pcap_platform_finddevs(pcap_if_t **, char *); 324 int add_addr_to_iflist(pcap_if_t **, const char *, u_int, struct sockaddr *, 325 size_t, struct sockaddr *, size_t, struct sockaddr *, size_t, 326 struct sockaddr *, size_t, char *); 327 int pcap_add_if(pcap_if_t **, const char *, u_int, const char *, char *); 328 struct sockaddr *dup_sockaddr(struct sockaddr *, size_t); 329 int add_or_find_if(pcap_if_t **, pcap_if_t **, const char *, u_int, 330 const char *, char *); 331 332 #ifdef WIN32 333 char *pcap_win32strerror(void); 334 #endif 335 336 int install_bpf_program(pcap_t *, struct bpf_program *); 337 338 int pcap_strcasecmp(const char *, const char *); 339 340 #ifdef __cplusplus 341 } 342 #endif 343 344 #endif 345
