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
40extern "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 */
70typedef enum {
71	NOT_SWAPPED,
72	SWAPPED,
73	MAYBE_SWAPPED
74} swapped_type_t;
75
76struct 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
86struct 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
138struct 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
219struct 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@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@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
250struct 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
266struct 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
275int	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? */
282int	pcap_offline_read(pcap_t *, int, pcap_handler, u_char *);
283int	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
296extern int snprintf (char *, size_t, const char *, ...);
297#endif
298
299#if !defined(HAVE_VSNPRINTF)
300#define vsnprintf pcap_vsnprintf
301extern 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)
308int	pcap_getnonblock_fd(pcap_t *, char *);
309int	pcap_setnonblock_fd(pcap_t *p, int, char *);
310#endif
311
312void	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 */
323int	pcap_platform_finddevs(pcap_if_t **, char *);
324int	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 *);
327int	pcap_add_if(pcap_if_t **, const char *, u_int, const char *, char *);
328struct sockaddr *dup_sockaddr(struct sockaddr *, size_t);
329int	add_or_find_if(pcap_if_t **, pcap_if_t **, const char *, u_int,
330	    const char *, char *);
331
332#ifdef WIN32
333char	*pcap_win32strerror(void);
334#endif
335
336int	install_bpf_program(pcap_t *, struct bpf_program *);
337
338int	pcap_strcasecmp(const char *, const char *);
339
340#ifdef __cplusplus
341}
342#endif
343
344#endif
345