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 1.68.2.11 2007/06/22 06:43:58 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 * Swap byte ordering of unsigned long long timestamp on a big endian 57 * machine. 58 */ 59 #define SWAPLL(ull) ((ull & 0xff00000000000000LL) >> 56) | \ 60 ((ull & 0x00ff000000000000LL) >> 40) | \ 61 ((ull & 0x0000ff0000000000LL) >> 24) | \ 62 ((ull & 0x000000ff00000000LL) >> 8) | \ 63 ((ull & 0x00000000ff000000LL) << 8) | \ 64 ((ull & 0x0000000000ff0000LL) << 24) | \ 65 ((ull & 0x000000000000ff00LL) << 40) | \ 66 ((ull & 0x00000000000000ffLL) << 56) 67 68 /* 69 * Savefile 70 */ 71 typedef enum { 72 NOT_SWAPPED, 73 SWAPPED, 74 MAYBE_SWAPPED 75 } swapped_type_t; 76 77 struct pcap_sf { 78 FILE *rfile; 79 int swapped; 80 int hdrsize; 81 swapped_type_t lengths_swapped; 82 int version_major; 83 int version_minor; 84 u_char *base; 85 }; 86 87 struct pcap_md { 88 struct pcap_stat stat; 89 /*XXX*/ 90 int use_bpf; /* using kernel filter */ 91 u_long TotPkts; /* can't oflow for 79 hrs on ether */ 92 u_long TotAccepted; /* count accepted by filter */ 93 u_long TotDrops; /* count of dropped packets */ 94 long TotMissed; /* missed by i/f during this run */ 95 long OrigMissed; /* missed by i/f before this run */ 96 char *device; /* device name */ 97 #ifdef linux 98 int sock_packet; /* using Linux 2.0 compatible interface */ 99 int timeout; /* timeout specified to pcap_open_live */ 100 int clear_promisc; /* must clear promiscuous mode when we close */ 101 int cooked; /* using SOCK_DGRAM rather than SOCK_RAW */ 102 int ifindex; /* interface index of device we're bound to */ 103 int lo_ifindex; /* interface index of the loopback device */ 104 struct pcap *next; /* list of open promiscuous sock_packet pcaps */ 105 u_int packets_read; /* count of packets read with recvfrom() */ 106 #endif 107 108 #ifdef HAVE_DAG_API 109 #ifdef HAVE_DAG_STREAMS_API 110 u_char *dag_mem_bottom; /* DAG card current memory bottom pointer */ 111 u_char *dag_mem_top; /* DAG card current memory top pointer */ 112 #else 113 void *dag_mem_base; /* DAG card memory base address */ 114 u_int dag_mem_bottom; /* DAG card current memory bottom offset */ 115 u_int dag_mem_top; /* DAG card current memory top offset */ 116 #endif /* HAVE_DAG_STREAMS_API */ 117 int dag_fcs_bits; /* Number of checksum bits from link layer */ 118 int dag_offset_flags; /* Flags to pass to dag_offset(). */ 119 int dag_stream; /* DAG stream number */ 120 int dag_timeout; /* timeout specified to pcap_open_live. 121 * Same as in linux above, introduce 122 * generally? */ 123 #endif /* HAVE_DAG_API */ 124 }; 125 126 /* 127 * 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 128 * Tru64 UNIX, and some versions of NetBSD pad FDDI packets to make everything 129 * line up on a nice boundary. 130 */ 131 #ifdef __NetBSD__ 132 #include <sys/param.h> /* needed to declare __NetBSD_Version__ */ 133 #endif 134 135 #if defined(ultrix) || defined(__osf__) || (defined(__NetBSD__) && __NetBSD_Version__ > 106000000) 136 #define PCAP_FDDIPAD 3 137 #endif 138 139 struct pcap { 140 #ifdef WIN32 141 ADAPTER *adapter; 142 LPPACKET Packet; 143 int timeout; 144 int nonblock; 145 #else 146 int fd; 147 int selectable_fd; 148 int send_fd; 149 #endif /* WIN32 */ 150 int snapshot; 151 int linktype; 152 int tzoff; /* timezone offset */ 153 int offset; /* offset for proper alignment */ 154 155 int break_loop; /* flag set to force break from packet-reading loop */ 156 157 #ifdef PCAP_FDDIPAD 158 int fddipad; 159 #endif 160 161 #ifdef MSDOS 162 int inter_packet_wait; /* offline: wait between packets */ 163 void (*wait_proc)(void); /* call proc while waiting */ 164 #endif 165 166 struct pcap_sf sf; 167 struct pcap_md md; 168 169 /* 170 * Read buffer -- for file descriptor read buffer model. 171 */ 172 int bufsize; 173 u_char *buffer; 174 u_char *bp; 175 int cc; 176 int to_ms; 177 178 /* 179 * Zero-copy read buffer -- for zero-copy BPF. 'buffer' above will 180 * alternative between these two actual mmap'd buffers as required. 181 * As there is a header on the front size of the mmap'd buffer, only 182 * some of the buffer is exposed to libpcap as a whole via bufsize; 183 * zbufsize is the true size. zbuffer tracks the current zbuf 184 * assocated with buffer so that it can be used to decide which the 185 * next buffer to read will be. 186 */ 187 u_char *zbuf1, *zbuf2, *zbuffer; 188 u_int zbufsize; 189 u_int timeout; 190 u_int zerocopy; 191 u_int interrupted; 192 struct timespec firstsel; 193 194 /* 195 * If there's currently a buffer being actively processed, then it is 196 * referenced here; 'buffer' is also pointed at it, but offset by the 197 * size of the header. 198 */ 199 struct bpf_zbuf_header *bzh; 200 201 /* 202 * Place holder for pcap_next(). 203 */ 204 u_char *pkt; 205 206 /* We're accepting only packets in this direction/these directions. */ 207 pcap_direction_t direction; 208 209 /* 210 * Methods. 211 */ 212 int (*read_op)(pcap_t *, int cnt, pcap_handler, u_char *); 213 int (*inject_op)(pcap_t *, const void *, size_t); 214 int (*setfilter_op)(pcap_t *, struct bpf_program *); 215 int (*setdirection_op)(pcap_t *, pcap_direction_t); 216 int (*set_datalink_op)(pcap_t *, int); 217 int (*getnonblock_op)(pcap_t *, char *); 218 int (*setnonblock_op)(pcap_t *, int, char *); 219 int (*stats_op)(pcap_t *, struct pcap_stat *); 220 void (*close_op)(pcap_t *); 221 222 /* 223 * Placeholder for filter code if bpf not in kernel. 224 */ 225 struct bpf_program fcode; 226 227 char errbuf[PCAP_ERRBUF_SIZE + 1]; 228 int dlt_count; 229 u_int *dlt_list; 230 231 struct pcap_pkthdr pcap_header; /* This is needed for the pcap_next_ex() to work */ 232 }; 233 234 /* 235 * This is a timeval as stored in a savefile. 236 * It has to use the same types everywhere, independent of the actual 237 * `struct timeval'; `struct timeval' has 32-bit tv_sec values on some 238 * platforms and 64-bit tv_sec values on other platforms, and writing 239 * out native `struct timeval' values would mean files could only be 240 * read on systems with the same tv_sec size as the system on which 241 * the file was written. 242 */ 243 244 struct pcap_timeval { 245 bpf_int32 tv_sec; /* seconds */ 246 bpf_int32 tv_usec; /* microseconds */ 247 }; 248 249 /* 250 * This is a `pcap_pkthdr' as actually stored in a savefile. 251 * 252 * Do not change the format of this structure, in any way (this includes 253 * changes that only affect the length of fields in this structure), 254 * and do not make the time stamp anything other than seconds and 255 * microseconds (e.g., seconds and nanoseconds). Instead: 256 * 257 * introduce a new structure for the new format; 258 * 259 * send mail to "tcpdump-workers@tcpdump.org", requesting a new 260 * magic number for your new capture file format, and, when 261 * you get the new magic number, put it in "savefile.c"; 262 * 263 * use that magic number for save files with the changed record 264 * header; 265 * 266 * make the code in "savefile.c" capable of reading files with 267 * the old record header as well as files with the new record header 268 * (using the magic number to determine the header format). 269 * 270 * Then supply the changes to "patches@tcpdump.org", so that future 271 * versions of libpcap and programs that use it (such as tcpdump) will 272 * be able to read your new capture file format. 273 */ 274 275 struct pcap_sf_pkthdr { 276 struct pcap_timeval ts; /* time stamp */ 277 bpf_u_int32 caplen; /* length of portion present */ 278 bpf_u_int32 len; /* length this packet (off wire) */ 279 }; 280 281 /* 282 * How a `pcap_pkthdr' is actually stored in savefiles written 283 * by some patched versions of libpcap (e.g. the ones in Red 284 * Hat Linux 6.1 and 6.2). 285 * 286 * Do not change the format of this structure, in any way (this includes 287 * changes that only affect the length of fields in this structure). 288 * Instead, introduce a new structure, as per the above. 289 */ 290 291 struct pcap_sf_patched_pkthdr { 292 struct pcap_timeval ts; /* time stamp */ 293 bpf_u_int32 caplen; /* length of portion present */ 294 bpf_u_int32 len; /* length this packet (off wire) */ 295 int index; 296 unsigned short protocol; 297 unsigned char pkt_type; 298 }; 299 300 int yylex(void); 301 302 #ifndef min 303 #define min(a, b) ((a) > (b) ? (b) : (a)) 304 #endif 305 306 /* XXX should these be in pcap.h? */ 307 int pcap_offline_read(pcap_t *, int, pcap_handler, u_char *); 308 int pcap_read(pcap_t *, int cnt, pcap_handler, u_char *); 309 310 #ifndef HAVE_STRLCPY 311 #define strlcpy(x, y, z) \ 312 (strncpy((x), (y), (z)), \ 313 ((z) <= 0 ? 0 : ((x)[(z) - 1] = '\0')), \ 314 strlen((y))) 315 #endif 316 317 #include <stdarg.h> 318 319 /* 320 * Routines that most pcap implementations can use for non-blocking mode. 321 */ 322 #if !defined(WIN32) && !defined(MSDOS) 323 int pcap_getnonblock_fd(pcap_t *, char *); 324 int pcap_setnonblock_fd(pcap_t *p, int, char *); 325 #endif 326 327 void pcap_close_common(pcap_t *); 328 329 /* 330 * Internal interfaces for "pcap_findalldevs()". 331 * 332 * "pcap_platform_finddevs()" is a platform-dependent routine to 333 * add devices not found by the "standard" mechanisms (SIOCGIFCONF, 334 * "getifaddrs()", etc.. 335 * 336 * "pcap_add_if()" adds an interface to the list of interfaces. 337 */ 338 int pcap_platform_finddevs(pcap_if_t **, char *); 339 int add_addr_to_iflist(pcap_if_t **, const char *, u_int, struct sockaddr *, 340 size_t, struct sockaddr *, size_t, struct sockaddr *, size_t, 341 struct sockaddr *, size_t, char *); 342 int pcap_add_if(pcap_if_t **, const char *, u_int, const char *, char *); 343 struct sockaddr *dup_sockaddr(struct sockaddr *, size_t); 344 int add_or_find_if(pcap_if_t **, pcap_if_t **, const char *, u_int, 345 const char *, char *); 346 347 #ifdef WIN32 348 char *pcap_win32strerror(void); 349 #endif 350 351 int install_bpf_program(pcap_t *, struct bpf_program *); 352 353 int pcap_strcasecmp(const char *, const char *); 354 355 #ifdef __cplusplus 356 } 357 #endif 358 359 #endif 360