Add tcpdump and libpcap.

- Update the file builder generator to handle generator specific cflags and
  includes. The tcpdump and libpcap have localised headers and need specific
  headers paths to see them. There are also module specific flags and these
  need to be passed to the lex and yacc generators.

- Add the tcpdump support.

1 files changed, 1812 insertions, 0 deletions

diff --git a/freebsd/contrib/libpcap/pcap.c b/freebsd/contrib/libpcap/pcap.c
new file mode 100644
index 00000000..11334563
--- /dev/null
+++ b/freebsd/contrib/libpcap/pcap.c
@@ -0,0 +1,1812 @@
+#include <machine/rtems-bsd-user-space.h>
+
+/*
+ * Copyright (c) 1993, 1994, 1995, 1996, 1997, 1998
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the Computer Systems
+ *	Engineering Group at Lawrence Berkeley Laboratory.
+ * 4. Neither the name of the University nor of the Laboratory may be used
+ *    to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if 0
+#ifndef lint
+static const char rcsid[] _U_ =
+    "@(#) $Header: /tcpdump/master/libpcap/pcap.c,v 1.128 2008-12-23 20:13:29 guy Exp $ (LBL)";
+#endif
+#endif
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#ifdef WIN32
+#include <pcap-stdinc.h>
+#else /* WIN32 */
+#if HAVE_INTTYPES_H
+#include <inttypes.h>
+#elif HAVE_STDINT_H
+#include <stdint.h>
+#endif
+#ifdef HAVE_SYS_BITYPES_H
+#include <sys/bitypes.h>
+#endif
+#include <rtems/bsd/sys/types.h>
+#include <sys/mman.h>
+#endif /* WIN32 */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#if !defined(_MSC_VER) && !defined(__BORLANDC__) && !defined(__MINGW32__)
+#include <unistd.h>
+#endif
+#include <fcntl.h>
+#include <errno.h>
+
+#ifdef HAVE_OS_PROTO_H
+#include "os-proto.h"
+#endif
+
+#ifdef MSDOS
+#include "pcap-dos.h"
+#endif
+
+#include "pcap-int.h"
+
+#ifdef HAVE_DAG_API
+#include "pcap-dag.h"
+#endif /* HAVE_DAG_API */
+
+#ifdef HAVE_SEPTEL_API
+#include "pcap-septel.h"
+#endif /* HAVE_SEPTEL_API */
+
+#ifdef HAVE_SNF_API
+#include "pcap-snf.h"
+#endif /* HAVE_SNF_API */
+
+#ifdef PCAP_SUPPORT_USB
+#include "pcap-usb-linux.h"
+#endif
+
+#ifdef PCAP_SUPPORT_BT
+#include "pcap-bt-linux.h"
+#endif
+
+#ifdef PCAP_SUPPORT_CAN
+#include "pcap-can-linux.h"
+#endif
+
+#ifdef PCAP_SUPPORT_CANUSB
+#include "pcap-canusb-linux.h"
+#endif
+
+#ifdef PCAP_SUPPORT_NETFILTER
+#include "pcap-netfilter-linux.h"
+#endif
+
+int
+pcap_not_initialized(pcap_t *pcap)
+{
+	/* this means 'not initialized' */
+	return (PCAP_ERROR_NOT_ACTIVATED);
+}
+
+/*
+ * Returns 1 if rfmon mode can be set on the pcap_t, 0 if it can't,
+ * a PCAP_ERROR value on an error.
+ */
+int
+pcap_can_set_rfmon(pcap_t *p)
+{
+	return (p->can_set_rfmon_op(p));
+}
+
+/*
+ * For systems where rfmon mode is never supported.
+ */
+static int
+pcap_cant_set_rfmon(pcap_t *p _U_)
+{
+	return (0);
+}
+
+/*
+ * Sets *tstamp_typesp to point to an array 1 or more supported time stamp
+ * types; the return value is the number of supported time stamp types.
+ * The list should be freed by a call to pcap_free_tstamp_types() when
+ * you're done with it.
+ *
+ * A return value of 0 means "you don't get a choice of time stamp type",
+ * in which case *tstamp_typesp is set to null.
+ *
+ * PCAP_ERROR is returned on error.
+ */
+int
+pcap_list_tstamp_types(pcap_t *p, int **tstamp_typesp)
+{
+	if (p->tstamp_type_count == 0) {
+		/*
+		 * We don't support multiple time stamp types.
+		 */
+		*tstamp_typesp = NULL;
+	} else {
+		*tstamp_typesp = (int*)calloc(sizeof(**tstamp_typesp),
+		    p->tstamp_type_count);
+		if (*tstamp_typesp == NULL) {
+			(void)snprintf(p->errbuf, sizeof(p->errbuf),
+			    "malloc: %s", pcap_strerror(errno));
+			return (PCAP_ERROR);
+		}
+		(void)memcpy(*tstamp_typesp, p->tstamp_type_list,
+		    sizeof(**tstamp_typesp) * p->tstamp_type_count);
+	}
+	return (p->tstamp_type_count);
+}
+
+/*
+ * In Windows, you might have a library built with one version of the
+ * C runtime library and an application built with another version of
+ * the C runtime library, which means that the library might use one
+ * version of malloc() and free() and the application might use another
+ * version of malloc() and free().  If so, that means something
+ * allocated by the library cannot be freed by the application, so we
+ * need to have a pcap_free_tstamp_types() routine to free up the list
+ * allocated by pcap_list_tstamp_types(), even though it's just a wrapper
+ * around free().
+ */
+void
+pcap_free_tstamp_types(int *tstamp_type_list)
+{
+	free(tstamp_type_list);
+}
+
+/*
+ * Default one-shot callback; overridden for capture types where the
+ * packet data cannot be guaranteed to be available after the callback
+ * returns, so that a copy must be made.
+ */
+static void
+pcap_oneshot(u_char *user, const struct pcap_pkthdr *h, const u_char *pkt)
+{
+	struct oneshot_userdata *sp = (struct oneshot_userdata *)user;
+
+	*sp->hdr = *h;
+	*sp->pkt = pkt;
+}
+
+const u_char *
+pcap_next(pcap_t *p, struct pcap_pkthdr *h)
+{
+	struct oneshot_userdata s;
+	const u_char *pkt;
+
+	s.hdr = h;
+	s.pkt = &pkt;
+	s.pd = p;
+	if (pcap_dispatch(p, 1, p->oneshot_callback, (u_char *)&s) <= 0)
+		return (0);
+	return (pkt);
+}
+
+int
+pcap_next_ex(pcap_t *p, struct pcap_pkthdr **pkt_header,
+    const u_char **pkt_data)
+{
+	struct oneshot_userdata s;
+
+	s.hdr = &p->pcap_header;
+	s.pkt = pkt_data;
+	s.pd = p;
+
+	/* Saves a pointer to the packet headers */
+	*pkt_header= &p->pcap_header;
+
+	if (p->sf.rfile != NULL) {
+		int status;
+
+		/* We are on an offline capture */
+		status = pcap_offline_read(p, 1, p->oneshot_callback,
+		    (u_char *)&s);
+
+		/*
+		 * Return codes for pcap_offline_read() are:
+		 *   -  0: EOF
+		 *   - -1: error
+		 *   - >1: OK
+		 * The first one ('0') conflicts with the return code of
+		 * 0 from pcap_read() meaning "no packets arrived before
+		 * the timeout expired", so we map it to -2 so you can
+		 * distinguish between an EOF from a savefile and a
+		 * "no packets arrived before the timeout expired, try
+		 * again" from a live capture.
+		 */
+		if (status == 0)
+			return (-2);
+		else
+			return (status);
+	}
+
+	/*
+	 * Return codes for pcap_read() are:
+	 *   -  0: timeout
+	 *   - -1: error
+	 *   - -2: loop was broken out of with pcap_breakloop()
+	 *   - >1: OK
+	 * The first one ('0') conflicts with the return code of 0 from
+	 * pcap_offline_read() meaning "end of file".
+	*/
+	return (p->read_op(p, 1, p->oneshot_callback, (u_char *)&s));
+}
+
+#if defined(DAG_ONLY)
+int
+pcap_findalldevs(pcap_if_t **alldevsp, char *errbuf)
+{
+	return (dag_findalldevs(alldevsp, errbuf));
+}
+
+pcap_t *
+pcap_create(const char *source, char *errbuf)
+{
+	return (dag_create(source, errbuf));
+}
+#elif defined(SEPTEL_ONLY)
+int
+pcap_findalldevs(pcap_if_t **alldevsp, char *errbuf)
+{
+	return (septel_findalldevs(alldevsp, errbuf));
+}
+
+pcap_t *
+pcap_create(const char *source, char *errbuf)
+{
+	return (septel_create(source, errbuf));
+}
+#elif defined(SNF_ONLY)
+int
+pcap_findalldevs(pcap_if_t **alldevsp, char *errbuf)
+{
+	return (snf_findalldevs(alldevsp, errbuf));
+}
+
+pcap_t *
+pcap_create(const char *source, char *errbuf)
+{
+	return (snf_create(source, errbuf));
+}
+#else /* regular pcap */
+struct capture_source_type {
+	int (*findalldevs_op)(pcap_if_t **, char *);
+	pcap_t *(*create_op)(const char *, char *, int *);
+} capture_source_types[] = {
+#ifdef HAVE_DAG_API
+	{ dag_findalldevs, dag_create },
+#endif
+#ifdef HAVE_SEPTEL_API
+	{ septel_findalldevs, septel_create },
+#endif
+#ifdef HAVE_SNF_API
+	{ snf_findalldevs, snf_create },
+#endif
+#ifdef PCAP_SUPPORT_BT
+	{ bt_findalldevs, bt_create },
+#endif
+#if PCAP_SUPPORT_CANUSB
+	{ canusb_findalldevs, canusb_create },
+#endif
+#ifdef PCAP_SUPPORT_CAN
+	{ can_findalldevs, can_create },
+#endif
+#ifdef PCAP_SUPPORT_USB
+	{ usb_findalldevs, usb_create },
+#endif
+#ifdef PCAP_SUPPORT_NETFILTER
+	{ netfilter_findalldevs, netfilter_create },
+#endif
+	{ NULL, NULL }
+};
+
+/*
+ * Get a list of all capture sources that are up and that we can open.
+ * Returns -1 on error, 0 otherwise.
+ * The list, as returned through "alldevsp", may be null if no interfaces
+ * were up and could be opened.
+ */
+int
+pcap_findalldevs(pcap_if_t **alldevsp, char *errbuf)
+{
+	size_t i;
+
+	/*
+	 * Get the list of regular interfaces first.
+	 */
+	if (pcap_findalldevs_interfaces(alldevsp, errbuf) == -1)
+		return (-1);	/* failure */
+
+	/*
+	 * Add any interfaces that need a platform-specific mechanism
+	 * to find.
+	 */
+	if (pcap_platform_finddevs(alldevsp, errbuf) == -1) {
+		/*
+		 * We had an error; free the list we've been
+		 * constructing.
+		 */
+		if (*alldevsp != NULL) {
+			pcap_freealldevs(*alldevsp);
+			*alldevsp = NULL;
+		}
+		return (-1);
+	}
+
+	/*
+	 * Ask each of the non-local-network-interface capture
+	 * source types what interfaces they have.
+	 */
+	for (i = 0; capture_source_types[i].findalldevs_op != NULL; i++) {
+		if (capture_source_types[i].findalldevs_op(alldevsp, errbuf) == -1) {
+			/*
+			 * We had an error; free the list we've been
+			 * constructing.
+			 */
+			if (*alldevsp != NULL) {
+				pcap_freealldevs(*alldevsp);
+				*alldevsp = NULL;
+			}
+			return (-1);
+		}
+	}
+	return (0);
+}
+
+pcap_t *
+pcap_create(const char *source, char *errbuf)
+{
+	size_t i;
+	int is_theirs;
+	pcap_t *p;
+
+	/*
+	 * A null source name is equivalent to the "any" device -
+	 * which might not be supported on this platform, but
+	 * this means that you'll get a "not supported" error
+	 * rather than, say, a crash when we try to dereference
+	 * the null pointer.
+	 */
+	if (source == NULL)
+		source = "any";
+
+	/*
+	 * Try each of the non-local-network-interface capture
+	 * source types until we find one that works for this
+	 * device or run out of types.
+	 */
+	for (i = 0; capture_source_types[i].create_op != NULL; i++) {
+		is_theirs = 0;
+		p = capture_source_types[i].create_op(source, errbuf, &is_theirs);
+		if (is_theirs) {
+			/*
+			 * The device name refers to a device of the
+			 * type in question; either it succeeded,
+			 * in which case p refers to a pcap_t to
+			 * later activate for the device, or it
+			 * failed, in which case p is null and we
+			 * should return that to report the failure
+			 * to create.
+			 */
+			return (p);
+		}
+	}
+
+	/*
+	 * OK, try it as a regular network interface.
+	 */
+	return (pcap_create_interface(source, errbuf));
+}
+#endif
+
+static void
+initialize_ops(pcap_t *p)
+{
+	/*
+	 * Set operation pointers for operations that only work on
+	 * an activated pcap_t to point to a routine that returns
+	 * a "this isn't activated" error.
+	 */
+	p->read_op = (read_op_t)pcap_not_initialized;
+	p->inject_op = (inject_op_t)pcap_not_initialized;
+	p->setfilter_op = (setfilter_op_t)pcap_not_initialized;
+	p->setdirection_op = (setdirection_op_t)pcap_not_initialized;
+	p->set_datalink_op = (set_datalink_op_t)pcap_not_initialized;
+	p->getnonblock_op = (getnonblock_op_t)pcap_not_initialized;
+	p->setnonblock_op = (setnonblock_op_t)pcap_not_initialized;
+	p->stats_op = (stats_op_t)pcap_not_initialized;
+#ifdef WIN32
+	p->setbuff_op = (setbuff_op_t)pcap_not_initialized;
+	p->setmode_op = (setmode_op_t)pcap_not_initialized;
+	p->setmintocopy_op = (setmintocopy_op_t)pcap_not_initialized;
+#endif
+
+	/*
+	 * Default cleanup operation - implementations can override
+	 * this, but should call pcap_cleanup_live_common() after
+	 * doing their own additional cleanup.
+	 */
+	p->cleanup_op = pcap_cleanup_live_common;
+
+	/*
+	 * In most cases, the standard one-short callback can
+	 * be used for pcap_next()/pcap_next_ex().
+	 */
+	p->oneshot_callback = pcap_oneshot;
+}
+
+pcap_t *
+pcap_create_common(const char *source, char *ebuf)
+{
+	pcap_t *p;
+
+	p = malloc(sizeof(*p));
+	if (p == NULL) {
+		snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s",
+		    pcap_strerror(errno));
+		return (NULL);
+	}
+	memset(p, 0, sizeof(*p));
+#ifndef WIN32
+	p->fd = -1;	/* not opened yet */
+	p->selectable_fd = -1;
+	p->send_fd = -1;
+#endif
+
+	p->opt.source = strdup(source);
+	if (p->opt.source == NULL) {
+		snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s",
+		    pcap_strerror(errno));
+		free(p);
+		return (NULL);
+	}
+
+	/*
+	 * Default to "can't set rfmon mode"; if it's supported by
+	 * a platform, the create routine that called us can set
+	 * the op to its routine to check whether a particular
+	 * device supports it.
+	 */
+	p->can_set_rfmon_op = pcap_cant_set_rfmon;
+
+	initialize_ops(p);
+
+	/* put in some defaults*/
+	pcap_set_timeout(p, 0);
+	pcap_set_snaplen(p, 65535);	/* max packet size */
+	p->opt.promisc = 0;
+	p->opt.buffer_size = 0;
+	p->opt.tstamp_type = -1;	/* default to not setting time stamp type */
+	return (p);
+}
+
+int
+pcap_check_activated(pcap_t *p)
+{
+	if (p->activated) {
+		snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "can't perform "
+			" operation on activated capture");
+		return (-1);
+	}
+	return (0);
+}
+
+int
+pcap_set_snaplen(pcap_t *p, int snaplen)
+{
+	if (pcap_check_activated(p))
+		return (PCAP_ERROR_ACTIVATED);
+	p->snapshot = snaplen;
+	return (0);
+}
+
+int
+pcap_set_promisc(pcap_t *p, int promisc)
+{
+	if (pcap_check_activated(p))
+		return (PCAP_ERROR_ACTIVATED);
+	p->opt.promisc = promisc;
+	return (0);
+}
+
+int
+pcap_set_rfmon(pcap_t *p, int rfmon)
+{
+	if (pcap_check_activated(p))
+		return (PCAP_ERROR_ACTIVATED);
+	p->opt.rfmon = rfmon;
+	return (0);
+}
+
+int
+pcap_set_timeout(pcap_t *p, int timeout_ms)
+{
+	if (pcap_check_activated(p))
+		return (PCAP_ERROR_ACTIVATED);
+	p->md.timeout = timeout_ms;
+	return (0);
+}
+
+int
+pcap_set_tstamp_type(pcap_t *p, int tstamp_type)
+{
+	int i;
+
+	if (pcap_check_activated(p))
+		return (PCAP_ERROR_ACTIVATED);
+
+	/*
+	 * If p->tstamp_type_count is 0, we don't support setting
+	 * the time stamp type at all.
+	 */
+	if (p->tstamp_type_count == 0)
+		return (PCAP_ERROR_CANTSET_TSTAMP_TYPE);
+
+	/*
+	 * Check whether we claim to support this type of time stamp.
+	 */
+	for (i = 0; i < p->tstamp_type_count; i++) {
+		if (p->tstamp_type_list[i] == tstamp_type) {
+			/*
+			 * Yes.
+			 */
+			p->opt.tstamp_type = tstamp_type;
+			return (0);
+		}
+	}
+
+	/*
+	 * No.  We support setting the time stamp type, but not to this
+	 * particular value.
+	 */
+	return (PCAP_WARNING_TSTAMP_TYPE_NOTSUP);
+}
+
+int
+pcap_set_buffer_size(pcap_t *p, int buffer_size)
+{
+	if (pcap_check_activated(p))
+		return (PCAP_ERROR_ACTIVATED);
+	p->opt.buffer_size = buffer_size;
+	return (0);
+}
+
+int
+pcap_activate(pcap_t *p)
+{
+	int status;
+
+	/*
+	 * Catch attempts to re-activate an already-activated
+	 * pcap_t; this should, for example, catch code that
+	 * calls pcap_open_live() followed by pcap_activate(),
+	 * as some code that showed up in a Stack Exchange
+	 * question did.
+	 */
+	if (pcap_check_activated(p))
+		return (PCAP_ERROR_ACTIVATED);
+	status = p->activate_op(p);
+	if (status >= 0)
+		p->activated = 1;
+	else {
+		if (p->errbuf[0] == '\0') {
+			/*
+			 * No error message supplied by the activate routine;
+			 * for the benefit of programs that don't specially
+			 * handle errors other than PCAP_ERROR, return the
+			 * error message corresponding to the status.
+			 */
+			snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "%s",
+			    pcap_statustostr(status));
+		}
+
+		/*
+		 * Undo any operation pointer setting, etc. done by
+		 * the activate operation.
+		 */
+		initialize_ops(p);
+	}
+	return (status);
+}
+
+pcap_t *
+pcap_open_live(const char *source, int snaplen, int promisc, int to_ms, char *errbuf)
+{
+	pcap_t *p;
+	int status;
+
+	p = pcap_create(source, errbuf);
+	if (p == NULL)
+		return (NULL);
+	status = pcap_set_snaplen(p, snaplen);
+	if (status < 0)
+		goto fail;
+	status = pcap_set_promisc(p, promisc);
+	if (status < 0)
+		goto fail;
+	status = pcap_set_timeout(p, to_ms);
+	if (status < 0)
+		goto fail;
+	/*
+	 * Mark this as opened with pcap_open_live(), so that, for
+	 * example, we show the full list of DLT_ values, rather
+	 * than just the ones that are compatible with capturing
+	 * when not in monitor mode.  That allows existing applications
+	 * to work the way they used to work, but allows new applications
+	 * that know about the new open API to, for example, find out the
+	 * DLT_ values that they can select without changing whether
+	 * the adapter is in monitor mode or not.
+	 */
+	p->oldstyle = 1;
+	status = pcap_activate(p);
+	if (status < 0)
+		goto fail;
+	return (p);
+fail:
+	if (status == PCAP_ERROR)
+		snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s", source,
+		    p->errbuf);
+	else if (status == PCAP_ERROR_NO_SUCH_DEVICE ||
+	    status == PCAP_ERROR_PERM_DENIED ||
+	    status == PCAP_ERROR_PROMISC_PERM_DENIED)
+		snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s (%s)", source,
+		    pcap_statustostr(status), p->errbuf);
+	else
+		snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s", source,
+		    pcap_statustostr(status));
+	pcap_close(p);
+	return (NULL);
+}
+
+int
+pcap_dispatch(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
+{
+	return (p->read_op(p, cnt, callback, user));
+}
+
+/*
+ * XXX - is this necessary?
+ */
+int
+pcap_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
+{
+
+	return (p->read_op(p, cnt, callback, user));
+}
+
+int
+pcap_loop(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
+{
+	register int n;
+
+	for (;;) {
+		if (p->sf.rfile != NULL) {
+			/*
+			 * 0 means EOF, so don't loop if we get 0.
+			 */
+			n = pcap_offline_read(p, cnt, callback, user);
+		} else {
+			/*
+			 * XXX keep reading until we get something
+			 * (or an error occurs)
+			 */
+			do {
+				n = p->read_op(p, cnt, callback, user);
+			} while (n == 0);
+		}
+		if (n <= 0)
+			return (n);
+		if (cnt > 0) {
+			cnt -= n;
+			if (cnt <= 0)
+				return (0);
+		}
+	}
+}
+
+/*
+ * Force the loop in "pcap_read()" or "pcap_read_offline()" to terminate.
+ */
+void
+pcap_breakloop(pcap_t *p)
+{
+	p->break_loop = 1;
+}
+
+int
+pcap_datalink(pcap_t *p)
+{
+	return (p->linktype);
+}
+
+int
+pcap_datalink_ext(pcap_t *p)
+{
+	return (p->linktype_ext);
+}
+
+int
+pcap_list_datalinks(pcap_t *p, int **dlt_buffer)
+{
+	if (p->dlt_count == 0) {
+		/*
+		 * We couldn't fetch the list of DLTs, which means
+		 * this platform doesn't support changing the
+		 * DLT for an interface.  Return a list of DLTs
+		 * containing only the DLT this device supports.
+		 */
+		*dlt_buffer = (int*)malloc(sizeof(**dlt_buffer));
+		if (*dlt_buffer == NULL) {
+			(void)snprintf(p->errbuf, sizeof(p->errbuf),
+			    "malloc: %s", pcap_strerror(errno));
+			return (-1);
+		}
+		**dlt_buffer = p->linktype;
+		return (1);
+	} else {
+		*dlt_buffer = (int*)calloc(sizeof(**dlt_buffer), p->dlt_count);
+		if (*dlt_buffer == NULL) {
+			(void)snprintf(p->errbuf, sizeof(p->errbuf),
+			    "malloc: %s", pcap_strerror(errno));
+			return (-1);
+		}
+		(void)memcpy(*dlt_buffer, p->dlt_list,
+		    sizeof(**dlt_buffer) * p->dlt_count);
+		return (p->dlt_count);
+	}
+}
+
+/*
+ * In Windows, you might have a library built with one version of the
+ * C runtime library and an application built with another version of
+ * the C runtime library, which means that the library might use one
+ * version of malloc() and free() and the application might use another
+ * version of malloc() and free().  If so, that means something
+ * allocated by the library cannot be freed by the application, so we
+ * need to have a pcap_free_datalinks() routine to free up the list
+ * allocated by pcap_list_datalinks(), even though it's just a wrapper
+ * around free().
+ */
+void
+pcap_free_datalinks(int *dlt_list)
+{
+	free(dlt_list);
+}
+
+int
+pcap_set_datalink(pcap_t *p, int dlt)
+{
+	int i;
+	const char *dlt_name;
+
+	if (p->dlt_count == 0 || p->set_datalink_op == NULL) {
+		/*
+		 * We couldn't fetch the list of DLTs, or we don't
+		 * have a "set datalink" operation, which means
+		 * this platform doesn't support changing the
+		 * DLT for an interface.  Check whether the new
+		 * DLT is the one this interface supports.
+		 */
+		if (p->linktype != dlt)
+			goto unsupported;
+
+		/*
+		 * It is, so there's nothing we need to do here.
+		 */
+		return (0);
+	}
+	for (i = 0; i < p->dlt_count; i++)
+		if (p->dlt_list[i] == dlt)
+			break;
+	if (i >= p->dlt_count)
+		goto unsupported;
+	if (p->dlt_count == 2 && p->dlt_list[0] == DLT_EN10MB &&
+	    dlt == DLT_DOCSIS) {
+		/*
+		 * This is presumably an Ethernet device, as the first
+		 * link-layer type it offers is DLT_EN10MB, and the only
+		 * other type it offers is DLT_DOCSIS.  That means that
+		 * we can't tell the driver to supply DOCSIS link-layer
+		 * headers - we're just pretending that's what we're
+		 * getting, as, presumably, we're capturing on a dedicated
+		 * link to a Cisco Cable Modem Termination System, and
+		 * it's putting raw DOCSIS frames on the wire inside low-level
+		 * Ethernet framing.
+		 */
+		p->linktype = dlt;
+		return (0);
+	}
+	if (p->set_datalink_op(p, dlt) == -1)
+		return (-1);
+	p->linktype = dlt;
+	return (0);
+
+unsupported:
+	dlt_name = pcap_datalink_val_to_name(dlt);
+	if (dlt_name != NULL) {
+		(void) snprintf(p->errbuf, sizeof(p->errbuf),
+		    "%s is not one of the DLTs supported by this device",
+		    dlt_name);
+	} else {
+		(void) snprintf(p->errbuf, sizeof(p->errbuf),
+		    "DLT %d is not one of the DLTs supported by this device",
+		    dlt);
+	}
+	return (-1);
+}
+
+/*
+ * This array is designed for mapping upper and lower case letter
+ * together for a case independent comparison.  The mappings are
+ * based upon ascii character sequences.
+ */
+static const u_char charmap[] = {
+	(u_char)'\000', (u_char)'\001', (u_char)'\002', (u_char)'\003',
+	(u_char)'\004', (u_char)'\005', (u_char)'\006', (u_char)'\007',
+	(u_char)'\010', (u_char)'\011', (u_char)'\012', (u_char)'\013',
+	(u_char)'\014', (u_char)'\015', (u_char)'\016', (u_char)'\017',
+	(u_char)'\020', (u_char)'\021', (u_char)'\022', (u_char)'\023',
+	(u_char)'\024', (u_char)'\025', (u_char)'\026', (u_char)'\027',
+	(u_char)'\030', (u_char)'\031', (u_char)'\032', (u_char)'\033',
+	(u_char)'\034', (u_char)'\035', (u_char)'\036', (u_char)'\037',
+	(u_char)'\040', (u_char)'\041', (u_char)'\042', (u_char)'\043',
+	(u_char)'\044', (u_char)'\045', (u_char)'\046', (u_char)'\047',
+	(u_char)'\050', (u_char)'\051', (u_char)'\052', (u_char)'\053',
+	(u_char)'\054', (u_char)'\055', (u_char)'\056', (u_char)'\057',
+	(u_char)'\060', (u_char)'\061', (u_char)'\062', (u_char)'\063',
+	(u_char)'\064', (u_char)'\065', (u_char)'\066', (u_char)'\067',
+	(u_char)'\070', (u_char)'\071', (u_char)'\072', (u_char)'\073',
+	(u_char)'\074', (u_char)'\075', (u_char)'\076', (u_char)'\077',
+	(u_char)'\100', (u_char)'\141', (u_char)'\142', (u_char)'\143',
+	(u_char)'\144', (u_char)'\145', (u_char)'\146', (u_char)'\147',
+	(u_char)'\150', (u_char)'\151', (u_char)'\152', (u_char)'\153',
+	(u_char)'\154', (u_char)'\155', (u_char)'\156', (u_char)'\157',
+	(u_char)'\160', (u_char)'\161', (u_char)'\162', (u_char)'\163',
+	(u_char)'\164', (u_char)'\165', (u_char)'\166', (u_char)'\167',
+	(u_char)'\170', (u_char)'\171', (u_char)'\172', (u_char)'\133',
+	(u_char)'\134', (u_char)'\135', (u_char)'\136', (u_char)'\137',
+	(u_char)'\140', (u_char)'\141', (u_char)'\142', (u_char)'\143',
+	(u_char)'\144', (u_char)'\145', (u_char)'\146', (u_char)'\147',
+	(u_char)'\150', (u_char)'\151', (u_char)'\152', (u_char)'\153',
+	(u_char)'\154', (u_char)'\155', (u_char)'\156', (u_char)'\157',
+	(u_char)'\160', (u_char)'\161', (u_char)'\162', (u_char)'\163',
+	(u_char)'\164', (u_char)'\165', (u_char)'\166', (u_char)'\167',
+	(u_char)'\170', (u_char)'\171', (u_char)'\172', (u_char)'\173',
+	(u_char)'\174', (u_char)'\175', (u_char)'\176', (u_char)'\177',
+	(u_char)'\200', (u_char)'\201', (u_char)'\202', (u_char)'\203',
+	(u_char)'\204', (u_char)'\205', (u_char)'\206', (u_char)'\207',
+	(u_char)'\210', (u_char)'\211', (u_char)'\212', (u_char)'\213',
+	(u_char)'\214', (u_char)'\215', (u_char)'\216', (u_char)'\217',
+	(u_char)'\220', (u_char)'\221', (u_char)'\222', (u_char)'\223',
+	(u_char)'\224', (u_char)'\225', (u_char)'\226', (u_char)'\227',
+	(u_char)'\230', (u_char)'\231', (u_char)'\232', (u_char)'\233',
+	(u_char)'\234', (u_char)'\235', (u_char)'\236', (u_char)'\237',
+	(u_char)'\240', (u_char)'\241', (u_char)'\242', (u_char)'\243',
+	(u_char)'\244', (u_char)'\245', (u_char)'\246', (u_char)'\247',
+	(u_char)'\250', (u_char)'\251', (u_char)'\252', (u_char)'\253',
+	(u_char)'\254', (u_char)'\255', (u_char)'\256', (u_char)'\257',
+	(u_char)'\260', (u_char)'\261', (u_char)'\262', (u_char)'\263',
+	(u_char)'\264', (u_char)'\265', (u_char)'\266', (u_char)'\267',
+	(u_char)'\270', (u_char)'\271', (u_char)'\272', (u_char)'\273',
+	(u_char)'\274', (u_char)'\275', (u_char)'\276', (u_char)'\277',
+	(u_char)'\300', (u_char)'\341', (u_char)'\342', (u_char)'\343',
+	(u_char)'\344', (u_char)'\345', (u_char)'\346', (u_char)'\347',
+	(u_char)'\350', (u_char)'\351', (u_char)'\352', (u_char)'\353',
+	(u_char)'\354', (u_char)'\355', (u_char)'\356', (u_char)'\357',
+	(u_char)'\360', (u_char)'\361', (u_char)'\362', (u_char)'\363',
+	(u_char)'\364', (u_char)'\365', (u_char)'\366', (u_char)'\367',
+	(u_char)'\370', (u_char)'\371', (u_char)'\372', (u_char)'\333',
+	(u_char)'\334', (u_char)'\335', (u_char)'\336', (u_char)'\337',
+	(u_char)'\340', (u_char)'\341', (u_char)'\342', (u_char)'\343',
+	(u_char)'\344', (u_char)'\345', (u_char)'\346', (u_char)'\347',
+	(u_char)'\350', (u_char)'\351', (u_char)'\352', (u_char)'\353',
+	(u_char)'\354', (u_char)'\355', (u_char)'\356', (u_char)'\357',
+	(u_char)'\360', (u_char)'\361', (u_char)'\362', (u_char)'\363',
+	(u_char)'\364', (u_char)'\365', (u_char)'\366', (u_char)'\367',
+	(u_char)'\370', (u_char)'\371', (u_char)'\372', (u_char)'\373',
+	(u_char)'\374', (u_char)'\375', (u_char)'\376', (u_char)'\377',
+};
+
+int
+pcap_strcasecmp(const char *s1, const char *s2)
+{
+	register const u_char	*cm = charmap,
+				*us1 = (const u_char *)s1,
+				*us2 = (const u_char *)s2;
+
+	while (cm[*us1] == cm[*us2++])
+		if (*us1++ == '\0')
+			return(0);
+	return (cm[*us1] - cm[*--us2]);
+}
+
+struct dlt_choice {
+	const char *name;
+	const char *description;
+	int	dlt;
+};
+
+#define DLT_CHOICE(code, description) { #code, description, code }
+#define DLT_CHOICE_SENTINEL { NULL, NULL, 0 }
+
+static struct dlt_choice dlt_choices[] = {
+	DLT_CHOICE(DLT_NULL, "BSD loopback"),
+	DLT_CHOICE(DLT_EN10MB, "Ethernet"),
+	DLT_CHOICE(DLT_IEEE802, "Token ring"),
+	DLT_CHOICE(DLT_ARCNET, "BSD ARCNET"),
+	DLT_CHOICE(DLT_SLIP, "SLIP"),
+	DLT_CHOICE(DLT_PPP, "PPP"),
+	DLT_CHOICE(DLT_FDDI, "FDDI"),
+	DLT_CHOICE(DLT_ATM_RFC1483, "RFC 1483 LLC-encapsulated ATM"),
+	DLT_CHOICE(DLT_RAW, "Raw IP"),
+	DLT_CHOICE(DLT_SLIP_BSDOS, "BSD/OS SLIP"),
+	DLT_CHOICE(DLT_PPP_BSDOS, "BSD/OS PPP"),
+	DLT_CHOICE(DLT_ATM_CLIP, "Linux Classical IP-over-ATM"),
+	DLT_CHOICE(DLT_PPP_SERIAL, "PPP over serial"),
+	DLT_CHOICE(DLT_PPP_ETHER, "PPPoE"),
+        DLT_CHOICE(DLT_SYMANTEC_FIREWALL, "Symantec Firewall"),
+	DLT_CHOICE(DLT_C_HDLC, "Cisco HDLC"),
+	DLT_CHOICE(DLT_IEEE802_11, "802.11"),
+	DLT_CHOICE(DLT_FRELAY, "Frame Relay"),
+	DLT_CHOICE(DLT_LOOP, "OpenBSD loopback"),
+	DLT_CHOICE(DLT_ENC, "OpenBSD encapsulated IP"),
+	DLT_CHOICE(DLT_LINUX_SLL, "Linux cooked"),
+	DLT_CHOICE(DLT_LTALK, "Localtalk"),
+	DLT_CHOICE(DLT_PFLOG, "OpenBSD pflog file"),
+	DLT_CHOICE(DLT_PFSYNC, "Packet filter state syncing"),
+	DLT_CHOICE(DLT_PRISM_HEADER, "802.11 plus Prism header"),
+	DLT_CHOICE(DLT_IP_OVER_FC, "RFC 2625 IP-over-Fibre Channel"),
+	DLT_CHOICE(DLT_SUNATM, "Sun raw ATM"),
+	DLT_CHOICE(DLT_IEEE802_11_RADIO, "802.11 plus radiotap header"),
+	DLT_CHOICE(DLT_ARCNET_LINUX, "Linux ARCNET"),
+        DLT_CHOICE(DLT_JUNIPER_MLPPP, "Juniper Multi-Link PPP"),
+	DLT_CHOICE(DLT_JUNIPER_MLFR, "Juniper Multi-Link Frame Relay"),
+        DLT_CHOICE(DLT_JUNIPER_ES, "Juniper Encryption Services PIC"),
+        DLT_CHOICE(DLT_JUNIPER_GGSN, "Juniper GGSN PIC"),
+	DLT_CHOICE(DLT_JUNIPER_MFR, "Juniper FRF.16 Frame Relay"),
+        DLT_CHOICE(DLT_JUNIPER_ATM2, "Juniper ATM2 PIC"),
+        DLT_CHOICE(DLT_JUNIPER_SERVICES, "Juniper Advanced Services PIC"),
+        DLT_CHOICE(DLT_JUNIPER_ATM1, "Juniper ATM1 PIC"),
+	DLT_CHOICE(DLT_APPLE_IP_OVER_IEEE1394, "Apple IP-over-IEEE 1394"),
+	DLT_CHOICE(DLT_MTP2_WITH_PHDR, "SS7 MTP2 with Pseudo-header"),
+	DLT_CHOICE(DLT_MTP2, "SS7 MTP2"),
+	DLT_CHOICE(DLT_MTP3, "SS7 MTP3"),
+	DLT_CHOICE(DLT_SCCP, "SS7 SCCP"),
+	DLT_CHOICE(DLT_DOCSIS, "DOCSIS"),
+	DLT_CHOICE(DLT_LINUX_IRDA, "Linux IrDA"),
+	DLT_CHOICE(DLT_IEEE802_11_RADIO_AVS, "802.11 plus AVS radio information header"),
+        DLT_CHOICE(DLT_JUNIPER_MONITOR, "Juniper Passive Monitor PIC"),
+	DLT_CHOICE(DLT_PPP_PPPD, "PPP for pppd, with direction flag"),
+	DLT_CHOICE(DLT_JUNIPER_PPPOE, "Juniper PPPoE"),
+	DLT_CHOICE(DLT_JUNIPER_PPPOE_ATM, "Juniper PPPoE/ATM"),
+	DLT_CHOICE(DLT_GPRS_LLC, "GPRS LLC"),
+	DLT_CHOICE(DLT_GPF_T, "GPF-T"),
+	DLT_CHOICE(DLT_GPF_F, "GPF-F"),
+	DLT_CHOICE(DLT_JUNIPER_PIC_PEER, "Juniper PIC Peer"),
+	DLT_CHOICE(DLT_ERF_ETH,	"Ethernet with Endace ERF header"),
+	DLT_CHOICE(DLT_ERF_POS, "Packet-over-SONET with Endace ERF header"),
+	DLT_CHOICE(DLT_LINUX_LAPD, "Linux vISDN LAPD"),
+	DLT_CHOICE(DLT_JUNIPER_ETHER, "Juniper Ethernet"),
+	DLT_CHOICE(DLT_JUNIPER_PPP, "Juniper PPP"),
+	DLT_CHOICE(DLT_JUNIPER_FRELAY, "Juniper Frame Relay"),
+	DLT_CHOICE(DLT_JUNIPER_CHDLC, "Juniper C-HDLC"),
+	DLT_CHOICE(DLT_MFR, "FRF.16 Frame Relay"),
+	DLT_CHOICE(DLT_JUNIPER_VP, "Juniper Voice PIC"),
+	DLT_CHOICE(DLT_A429, "Arinc 429"),
+	DLT_CHOICE(DLT_A653_ICM, "Arinc 653 Interpartition Communication"),
+	DLT_CHOICE(DLT_USB, "USB"),
+	DLT_CHOICE(DLT_BLUETOOTH_HCI_H4, "Bluetooth HCI UART transport layer"),
+	DLT_CHOICE(DLT_IEEE802_16_MAC_CPS, "IEEE 802.16 MAC Common Part Sublayer"),
+	DLT_CHOICE(DLT_USB_LINUX, "USB with Linux header"),
+	DLT_CHOICE(DLT_CAN20B, "Controller Area Network (CAN) v. 2.0B"),
+	DLT_CHOICE(DLT_IEEE802_15_4_LINUX, "IEEE 802.15.4 with Linux padding"),
+	DLT_CHOICE(DLT_PPI, "Per-Packet Information"),
+	DLT_CHOICE(DLT_IEEE802_16_MAC_CPS_RADIO, "IEEE 802.16 MAC Common Part Sublayer plus radiotap header"),
+	DLT_CHOICE(DLT_JUNIPER_ISM, "Juniper Integrated Service Module"),
+	DLT_CHOICE(DLT_IEEE802_15_4, "IEEE 802.15.4 with FCS"),
+	DLT_CHOICE(DLT_SITA, "SITA pseudo-header"),
+	DLT_CHOICE(DLT_ERF, "Endace ERF header"),
+	DLT_CHOICE(DLT_RAIF1, "Ethernet with u10 Networks pseudo-header"),
+	DLT_CHOICE(DLT_IPMB, "IPMB"),
+	DLT_CHOICE(DLT_JUNIPER_ST, "Juniper Secure Tunnel"),
+	DLT_CHOICE(DLT_BLUETOOTH_HCI_H4_WITH_PHDR, "Bluetooth HCI UART transport layer plus pseudo-header"),
+	DLT_CHOICE(DLT_AX25_KISS, "AX.25 with KISS header"),
+	DLT_CHOICE(DLT_IEEE802_15_4_NONASK_PHY, "IEEE 802.15.4 with non-ASK PHY data"),
+	DLT_CHOICE(DLT_MPLS, "MPLS with label as link-layer header"),
+	DLT_CHOICE(DLT_USB_LINUX_MMAPPED, "USB with padded Linux header"),
+	DLT_CHOICE(DLT_DECT, "DECT"),
+	DLT_CHOICE(DLT_AOS, "AOS Space Data Link protocol"),
+	DLT_CHOICE(DLT_WIHART, "Wireless HART"),
+	DLT_CHOICE(DLT_FC_2, "Fibre Channel FC-2"),
+	DLT_CHOICE(DLT_FC_2_WITH_FRAME_DELIMS, "Fibre Channel FC-2 with frame delimiters"),
+	DLT_CHOICE(DLT_IPNET, "Solaris ipnet"),
+	DLT_CHOICE(DLT_CAN_SOCKETCAN, "CAN-bus with SocketCAN headers"),
+	DLT_CHOICE(DLT_IPV4, "Raw IPv4"),
+	DLT_CHOICE(DLT_IPV6, "Raw IPv6"),
+	DLT_CHOICE(DLT_IEEE802_15_4_NOFCS, "IEEE 802.15.4 without FCS"),
+	DLT_CHOICE(DLT_JUNIPER_VS, "Juniper Virtual Server"),
+	DLT_CHOICE(DLT_JUNIPER_SRX_E2E, "Juniper SRX E2E"),
+	DLT_CHOICE(DLT_JUNIPER_FIBRECHANNEL, "Juniper Fibre Channel"),
+	DLT_CHOICE(DLT_DVB_CI, "DVB-CI"),
+	DLT_CHOICE(DLT_JUNIPER_ATM_CEMIC, "Juniper ATM CEMIC"),
+	DLT_CHOICE(DLT_NFLOG, "Linux netfilter log messages"),
+	DLT_CHOICE(DLT_NETANALYZER, "Ethernet with Hilscher netANALYZER pseudo-header"),
+	DLT_CHOICE(DLT_NETANALYZER_TRANSPARENT, "Ethernet with Hilscher netANALYZER pseudo-header and with preamble and SFD"),
+	DLT_CHOICE(DLT_IPOIB, "RFC 4391 IP-over-Infiniband"),
+	DLT_CHOICE_SENTINEL
+};
+
+int
+pcap_datalink_name_to_val(const char *name)
+{
+	int i;
+
+	for (i = 0; dlt_choices[i].name != NULL; i++) {
+		if (pcap_strcasecmp(dlt_choices[i].name + sizeof("DLT_") - 1,
+		    name) == 0)
+			return (dlt_choices[i].dlt);
+	}
+	return (-1);
+}
+
+const char *
+pcap_datalink_val_to_name(int dlt)
+{
+	int i;
+
+	for (i = 0; dlt_choices[i].name != NULL; i++) {
+		if (dlt_choices[i].dlt == dlt)
+			return (dlt_choices[i].name + sizeof("DLT_") - 1);
+	}
+	return (NULL);
+}
+
+const char *
+pcap_datalink_val_to_description(int dlt)
+{
+	int i;
+
+	for (i = 0; dlt_choices[i].name != NULL; i++) {
+		if (dlt_choices[i].dlt == dlt)
+			return (dlt_choices[i].description);
+	}
+	return (NULL);
+}
+
+struct tstamp_type_choice {
+	const char *name;
+	const char *description;
+	int	type;
+};
+
+static struct tstamp_type_choice tstamp_type_choices[] = {
+	{ "host", "Host", PCAP_TSTAMP_HOST },
+	{ "host_lowprec", "Host, low precision", PCAP_TSTAMP_HOST_LOWPREC },
+	{ "host_hiprec", "Host, high precision", PCAP_TSTAMP_HOST_HIPREC },
+	{ "adapter", "Adapter", PCAP_TSTAMP_ADAPTER },
+	{ "adapter_unsynced", "Adapter, not synced with system time", PCAP_TSTAMP_ADAPTER_UNSYNCED },
+	{ NULL, NULL, 0 }
+};
+
+int
+pcap_tstamp_type_name_to_val(const char *name)
+{
+	int i;
+
+	for (i = 0; tstamp_type_choices[i].name != NULL; i++) {
+		if (pcap_strcasecmp(tstamp_type_choices[i].name, name) == 0)
+			return (tstamp_type_choices[i].type);
+	}
+	return (PCAP_ERROR);
+}
+
+const char *
+pcap_tstamp_type_val_to_name(int tstamp_type)
+{
+	int i;
+
+	for (i = 0; tstamp_type_choices[i].name != NULL; i++) {
+		if (tstamp_type_choices[i].type == tstamp_type)
+			return (tstamp_type_choices[i].name);
+	}
+	return (NULL);
+}
+
+const char *
+pcap_tstamp_type_val_to_description(int tstamp_type)
+{
+	int i;
+
+	for (i = 0; tstamp_type_choices[i].name != NULL; i++) {
+		if (tstamp_type_choices[i].type == tstamp_type)
+			return (tstamp_type_choices[i].description);
+	}
+	return (NULL);
+}
+
+int
+pcap_snapshot(pcap_t *p)
+{
+	return (p->snapshot);
+}
+
+int
+pcap_is_swapped(pcap_t *p)
+{
+	return (p->sf.swapped);
+}
+
+int
+pcap_major_version(pcap_t *p)
+{
+	return (p->sf.version_major);
+}
+
+int
+pcap_minor_version(pcap_t *p)
+{
+	return (p->sf.version_minor);
+}
+
+FILE *
+pcap_file(pcap_t *p)
+{
+	return (p->sf.rfile);
+}
+
+int
+pcap_fileno(pcap_t *p)
+{
+#ifndef WIN32
+	return (p->fd);
+#else
+	if (p->adapter != NULL)
+		return ((int)(DWORD)p->adapter->hFile);
+	else
+		return (-1);
+#endif
+}
+
+#if !defined(WIN32) && !defined(MSDOS)
+int
+pcap_get_selectable_fd(pcap_t *p)
+{
+	return (p->selectable_fd);
+}
+#endif
+
+void
+pcap_perror(pcap_t *p, char *prefix)
+{
+	fprintf(stderr, "%s: %s\n", prefix, p->errbuf);
+}
+
+char *
+pcap_geterr(pcap_t *p)
+{
+	return (p->errbuf);
+}
+
+int
+pcap_getnonblock(pcap_t *p, char *errbuf)
+{
+	int ret;
+
+	ret = p->getnonblock_op(p, errbuf);
+	if (ret == -1) {
+		/*
+		 * In case somebody depended on the bug wherein
+		 * the error message was put into p->errbuf
+		 * by pcap_getnonblock_fd().
+		 */
+		strlcpy(p->errbuf, errbuf, PCAP_ERRBUF_SIZE);
+	}
+	return (ret);
+}
+
+/*
+ * Get the current non-blocking mode setting, under the assumption that
+ * it's just the standard POSIX non-blocking flag.
+ *
+ * We don't look at "p->nonblock", in case somebody tweaked the FD
+ * directly.
+ */
+#if !defined(WIN32) && !defined(MSDOS)
+int
+pcap_getnonblock_fd(pcap_t *p, char *errbuf)
+{
+	int fdflags;
+
+	fdflags = fcntl(p->fd, F_GETFL, 0);
+	if (fdflags == -1) {
+		snprintf(errbuf, PCAP_ERRBUF_SIZE, "F_GETFL: %s",
+		    pcap_strerror(errno));
+		return (-1);
+	}
+	if (fdflags & O_NONBLOCK)
+		return (1);
+	else
+		return (0);
+}
+#endif
+
+int
+pcap_setnonblock(pcap_t *p, int nonblock, char *errbuf)
+{
+	int ret;
+
+	ret = p->setnonblock_op(p, nonblock, errbuf);
+	if (ret == -1) {
+		/*
+		 * In case somebody depended on the bug wherein
+		 * the error message was put into p->errbuf
+		 * by pcap_setnonblock_fd().
+		 */
+		strlcpy(p->errbuf, errbuf, PCAP_ERRBUF_SIZE);
+	}
+	return (ret);
+}
+
+#if !defined(WIN32) && !defined(MSDOS)
+/*
+ * Set non-blocking mode, under the assumption that it's just the
+ * standard POSIX non-blocking flag.  (This can be called by the
+ * per-platform non-blocking-mode routine if that routine also
+ * needs to do some additional work.)
+ */
+int
+pcap_setnonblock_fd(pcap_t *p, int nonblock, char *errbuf)
+{
+	int fdflags;
+
+	fdflags = fcntl(p->fd, F_GETFL, 0);
+	if (fdflags == -1) {
+		snprintf(errbuf, PCAP_ERRBUF_SIZE, "F_GETFL: %s",
+		    pcap_strerror(errno));
+		return (-1);
+	}
+	if (nonblock)
+		fdflags |= O_NONBLOCK;
+	else
+		fdflags &= ~O_NONBLOCK;
+	if (fcntl(p->fd, F_SETFL, fdflags) == -1) {
+		snprintf(errbuf, PCAP_ERRBUF_SIZE, "F_SETFL: %s",
+		    pcap_strerror(errno));
+		return (-1);
+	}
+	return (0);
+}
+#endif
+
+#ifdef WIN32
+/*
+ * Generate a string for the last Win32-specific error (i.e. an error generated when
+ * calling a Win32 API).
+ * For errors occurred during standard C calls, we still use pcap_strerror()
+ */
+char *
+pcap_win32strerror(void)
+{
+	DWORD error;
+	static char errbuf[PCAP_ERRBUF_SIZE+1];
+	int errlen;
+	char *p;
+
+	error = GetLastError();
+	FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, error, 0, errbuf,
+	    PCAP_ERRBUF_SIZE, NULL);
+
+	/*
+	 * "FormatMessage()" "helpfully" sticks CR/LF at the end of the
+	 * message.  Get rid of it.
+	 */
+	errlen = strlen(errbuf);
+	if (errlen >= 2) {
+		errbuf[errlen - 1] = '\0';
+		errbuf[errlen - 2] = '\0';
+	}
+	p = strchr(errbuf, '\0');
+	snprintf (p, sizeof(errbuf)-(p-errbuf), " (%lu)", error);
+	return (errbuf);
+}
+#endif
+
+/*
+ * Generate error strings for PCAP_ERROR_ and PCAP_WARNING_ values.
+ */
+const char *
+pcap_statustostr(int errnum)
+{
+	static char ebuf[15+10+1];
+
+	switch (errnum) {
+
+	case PCAP_WARNING:
+		return("Generic warning");
+
+	case PCAP_WARNING_TSTAMP_TYPE_NOTSUP:
+		return ("That type of time stamp is not supported by that device");
+
+	case PCAP_WARNING_PROMISC_NOTSUP:
+		return ("That device doesn't support promiscuous mode");
+
+	case PCAP_ERROR:
+		return("Generic error");
+
+	case PCAP_ERROR_BREAK:
+		return("Loop terminated by pcap_breakloop");
+
+	case PCAP_ERROR_NOT_ACTIVATED:
+		return("The pcap_t has not been activated");
+
+	case PCAP_ERROR_ACTIVATED:
+		return ("The setting can't be changed after the pcap_t is activated");
+
+	case PCAP_ERROR_NO_SUCH_DEVICE:
+		return ("No such device exists");
+
+	case PCAP_ERROR_RFMON_NOTSUP:
+		return ("That device doesn't support monitor mode");
+
+	case PCAP_ERROR_NOT_RFMON:
+		return ("That operation is supported only in monitor mode");
+
+	case PCAP_ERROR_PERM_DENIED:
+		return ("You don't have permission to capture on that device");
+
+	case PCAP_ERROR_IFACE_NOT_UP:
+		return ("That device is not up");
+
+	case PCAP_ERROR_CANTSET_TSTAMP_TYPE:
+		return ("That device doesn't support setting the time stamp type");
+
+	case PCAP_ERROR_PROMISC_PERM_DENIED:
+		return ("You don't have permission to capture in promiscuous mode on that device");
+	}
+	(void)snprintf(ebuf, sizeof ebuf, "Unknown error: %d", errnum);
+	return(ebuf);
+}
+
+/*
+ * Not all systems have strerror().
+ */
+const char *
+pcap_strerror(int errnum)
+{
+#ifdef HAVE_STRERROR
+	return (strerror(errnum));
+#else
+	extern int sys_nerr;
+	extern const char *const sys_errlist[];
+	static char ebuf[15+10+1];
+
+	if ((unsigned int)errnum < sys_nerr)
+		return ((char *)sys_errlist[errnum]);
+	(void)snprintf(ebuf, sizeof ebuf, "Unknown error: %d", errnum);
+	return(ebuf);
+#endif
+}
+
+int
+pcap_setfilter(pcap_t *p, struct bpf_program *fp)
+{
+	return (p->setfilter_op(p, fp));
+}
+
+/*
+ * Set direction flag, which controls whether we accept only incoming
+ * packets, only outgoing packets, or both.
+ * Note that, depending on the platform, some or all direction arguments
+ * might not be supported.
+ */
+int
+pcap_setdirection(pcap_t *p, pcap_direction_t d)
+{
+	if (p->setdirection_op == NULL) {
+		snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+		    "Setting direction is not implemented on this platform");
+		return (-1);
+	} else
+		return (p->setdirection_op(p, d));
+}
+
+int
+pcap_stats(pcap_t *p, struct pcap_stat *ps)
+{
+	return (p->stats_op(p, ps));
+}
+
+static int
+pcap_stats_dead(pcap_t *p, struct pcap_stat *ps _U_)
+{
+	snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+	    "Statistics aren't available from a pcap_open_dead pcap_t");
+	return (-1);
+}
+
+#ifdef WIN32
+int
+pcap_setbuff(pcap_t *p, int dim)
+{
+	return (p->setbuff_op(p, dim));
+}
+
+static int
+pcap_setbuff_dead(pcap_t *p, int dim)
+{
+	snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+	    "The kernel buffer size cannot be set on a pcap_open_dead pcap_t");
+	return (-1);
+}
+
+int
+pcap_setmode(pcap_t *p, int mode)
+{
+	return (p->setmode_op(p, mode));
+}
+
+static int
+pcap_setmode_dead(pcap_t *p, int mode)
+{
+	snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+	    "impossible to set mode on a pcap_open_dead pcap_t");
+	return (-1);
+}
+
+int
+pcap_setmintocopy(pcap_t *p, int size)
+{
+	return (p->setmintocopy_op(p, size));
+}
+
+static int
+pcap_setmintocopy_dead(pcap_t *p, int size)
+{
+	snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+	    "The mintocopy parameter cannot be set on a pcap_open_dead pcap_t");
+	return (-1);
+}
+#endif
+
+/*
+ * On some platforms, we need to clean up promiscuous or monitor mode
+ * when we close a device - and we want that to happen even if the
+ * application just exits without explicitl closing devices.
+ * On those platforms, we need to register a "close all the pcaps"
+ * routine to be called when we exit, and need to maintain a list of
+ * pcaps that need to be closed to clean up modes.
+ *
+ * XXX - not thread-safe.
+ */
+
+/*
+ * List of pcaps on which we've done something that needs to be
+ * cleaned up.
+ * If there are any such pcaps, we arrange to call "pcap_close_all()"
+ * when we exit, and have it close all of them.
+ */
+static struct pcap *pcaps_to_close;
+
+/*
+ * TRUE if we've already called "atexit()" to cause "pcap_close_all()" to
+ * be called on exit.
+ */
+static int did_atexit;
+
+static void
+pcap_close_all(void)
+{
+	struct pcap *handle;
+
+	while ((handle = pcaps_to_close) != NULL)
+		pcap_close(handle);
+}
+
+int
+pcap_do_addexit(pcap_t *p)
+{
+	/*
+	 * If we haven't already done so, arrange to have
+	 * "pcap_close_all()" called when we exit.
+	 */
+	if (!did_atexit) {
+		if (atexit(pcap_close_all) == -1) {
+			/*
+			 * "atexit()" failed; let our caller know.
+			 */
+			strncpy(p->errbuf, "atexit failed",
+			    PCAP_ERRBUF_SIZE);
+			return (0);
+		}
+		did_atexit = 1;
+	}
+	return (1);
+}
+
+void
+pcap_add_to_pcaps_to_close(pcap_t *p)
+{
+	p->md.next = pcaps_to_close;
+	pcaps_to_close = p;
+}
+
+void
+pcap_remove_from_pcaps_to_close(pcap_t *p)
+{
+	pcap_t *pc, *prevpc;
+
+	for (pc = pcaps_to_close, prevpc = NULL; pc != NULL;
+	    prevpc = pc, pc = pc->md.next) {
+		if (pc == p) {
+			/*
+			 * Found it.  Remove it from the list.
+			 */
+			if (prevpc == NULL) {
+				/*
+				 * It was at the head of the list.
+				 */
+				pcaps_to_close = pc->md.next;
+			} else {
+				/*
+				 * It was in the middle of the list.
+				 */
+				prevpc->md.next = pc->md.next;
+			}
+			break;
+		}
+	}
+}
+
+void
+pcap_cleanup_live_common(pcap_t *p)
+{
+	if (p->buffer != NULL) {
+		free(p->buffer);
+		p->buffer = NULL;
+	}
+	if (p->dlt_list != NULL) {
+		free(p->dlt_list);
+		p->dlt_list = NULL;
+		p->dlt_count = 0;
+	}
+	if (p->tstamp_type_list != NULL) {
+		free(p->tstamp_type_list);
+		p->tstamp_type_list = NULL;
+		p->tstamp_type_count = 0;
+	}
+	pcap_freecode(&p->fcode);
+#if !defined(WIN32) && !defined(MSDOS)
+	if (p->fd >= 0) {
+		close(p->fd);
+		p->fd = -1;
+	}
+	p->selectable_fd = -1;
+	p->send_fd = -1;
+#endif
+}
+
+static void
+pcap_cleanup_dead(pcap_t *p _U_)
+{
+	/* Nothing to do. */
+}
+
+pcap_t *
+pcap_open_dead(int linktype, int snaplen)
+{
+	pcap_t *p;
+
+	p = malloc(sizeof(*p));
+	if (p == NULL)
+		return NULL;
+	memset (p, 0, sizeof(*p));
+	p->snapshot = snaplen;
+	p->linktype = linktype;
+	p->stats_op = pcap_stats_dead;
+#ifdef WIN32
+	p->setbuff_op = pcap_setbuff_dead;
+	p->setmode_op = pcap_setmode_dead;
+	p->setmintocopy_op = pcap_setmintocopy_dead;
+#endif
+	p->cleanup_op = pcap_cleanup_dead;
+	p->activated = 1;
+	return (p);
+}
+
+/*
+ * API compatible with WinPcap's "send a packet" routine - returns -1
+ * on error, 0 otherwise.
+ *
+ * XXX - what if we get a short write?
+ */
+int
+pcap_sendpacket(pcap_t *p, const u_char *buf, int size)
+{
+	if (p->inject_op(p, buf, size) == -1)
+		return (-1);
+	return (0);
+}
+
+/*
+ * API compatible with OpenBSD's "send a packet" routine - returns -1 on
+ * error, number of bytes written otherwise.
+ */
+int
+pcap_inject(pcap_t *p, const void *buf, size_t size)
+{
+	return (p->inject_op(p, buf, size));
+}
+
+void
+pcap_close(pcap_t *p)
+{
+	if (p->opt.source != NULL)
+		free(p->opt.source);
+	p->cleanup_op(p);
+	free(p);
+}
+
+/*
+ * Given a BPF program, a pcap_pkthdr structure for a packet, and the raw
+ * data for the packet, check whether the packet passes the filter.
+ * Returns the return value of the filter program, which will be zero if
+ * the packet doesn't pass and non-zero if the packet does pass.
+ */
+int
+pcap_offline_filter(const struct bpf_program *fp, const struct pcap_pkthdr *h,
+    const u_char *pkt)
+{
+	const struct bpf_insn *fcode = fp->bf_insns;
+
+	if (fcode != NULL)
+		return (bpf_filter(fcode, pkt, h->len, h->caplen));
+	else
+		return (0);
+}
+
+/*
+ * We make the version string static, and return a pointer to it, rather
+ * than exporting the version string directly.  On at least some UNIXes,
+ * if you import data from a shared library into an program, the data is
+ * bound into the program binary, so if the string in the version of the
+ * library with which the program was linked isn't the same as the
+ * string in the version of the library with which the program is being
+ * run, various undesirable things may happen (warnings, the string
+ * being the one from the version of the library with which the program
+ * was linked, or even weirder things, such as the string being the one
+ * from the library but being truncated).
+ */
+#ifdef HAVE_VERSION_H
+#include "version.h"
+#else
+static const char pcap_version_string[] = "libpcap version 1.x.y";
+#endif
+
+#ifdef WIN32
+/*
+ * XXX - it'd be nice if we could somehow generate the WinPcap and libpcap
+ * version numbers when building WinPcap.  (It'd be nice to do so for
+ * the packet.dll version number as well.)
+ */
+static const char wpcap_version_string[] = "4.0";
+static const char pcap_version_string_fmt[] =
+    "WinPcap version %s, based on %s";
+static const char pcap_version_string_packet_dll_fmt[] =
+    "WinPcap version %s (packet.dll version %s), based on %s";
+static char *full_pcap_version_string;
+
+const char *
+pcap_lib_version(void)
+{
+	char *packet_version_string;
+	size_t full_pcap_version_string_len;
+
+	if (full_pcap_version_string == NULL) {
+		/*
+		 * Generate the version string.
+		 */
+		packet_version_string = PacketGetVersion();
+		if (strcmp(wpcap_version_string, packet_version_string) == 0) {
+			/*
+			 * WinPcap version string and packet.dll version
+			 * string are the same; just report the WinPcap
+			 * version.
+			 */
+			full_pcap_version_string_len =
+			    (sizeof pcap_version_string_fmt - 4) +
+			    strlen(wpcap_version_string) +
+			    strlen(pcap_version_string);
+			full_pcap_version_string =
+			    malloc(full_pcap_version_string_len);
+			sprintf(full_pcap_version_string,
+			    pcap_version_string_fmt, wpcap_version_string,
+			    pcap_version_string);
+		} else {
+			/*
+			 * WinPcap version string and packet.dll version
+			 * string are different; that shouldn't be the
+			 * case (the two libraries should come from the
+			 * same version of WinPcap), so we report both
+			 * versions.
+			 */
+			full_pcap_version_string_len =
+			    (sizeof pcap_version_string_packet_dll_fmt - 6) +
+			    strlen(wpcap_version_string) +
+			    strlen(packet_version_string) +
+			    strlen(pcap_version_string);
+			full_pcap_version_string = malloc(full_pcap_version_string_len);
+
+			sprintf(full_pcap_version_string,
+			    pcap_version_string_packet_dll_fmt,
+			    wpcap_version_string, packet_version_string,
+			    pcap_version_string);
+		}
+	}
+	return (full_pcap_version_string);
+}
+
+#elif defined(MSDOS)
+
+static char *full_pcap_version_string;
+
+const char *
+pcap_lib_version (void)
+{
+	char *packet_version_string;
+	size_t full_pcap_version_string_len;
+	static char dospfx[] = "DOS-";
+
+	if (full_pcap_version_string == NULL) {
+		/*
+		 * Generate the version string.
+		 */
+		full_pcap_version_string_len =
+		    sizeof dospfx + strlen(pcap_version_string);
+		full_pcap_version_string =
+		    malloc(full_pcap_version_string_len);
+		strcpy(full_pcap_version_string, dospfx);
+		strcat(full_pcap_version_string, pcap_version_string);
+	}
+	return (full_pcap_version_string);
+}
+
+#else /* UN*X */
+
+const char *
+pcap_lib_version(void)
+{
+	return (pcap_version_string);
+}
+#endif