Flatten vendor/libpcap and remove keyword expansion.

1 files changed, 0 insertions, 2221 deletions

diff --git a/contrib/libpcap/pcap-linux.c b/contrib/libpcap/pcap-linux.c
deleted file mode 100644
index e9db010..0000000
--- a/contrib/libpcap/pcap-linux.c
+++ /dev/null
@@ -1,2221 +0,0 @@
-/*
- *  pcap-linux.c: Packet capture interface to the Linux kernel
- *
- *  Copyright (c) 2000 Torsten Landschoff <torsten@debian.org>
- *  		       Sebastian Krahmer  <krahmer@cs.uni-potsdam.de>
- *
- *  License: BSD
- *
- *  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. The names of the authors may not be used to endorse or promote
- *     products derived from this software without specific prior
- *     written permission.
- *
- *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
- *  IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
- *  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
- */
-
-#ifndef lint
-static const char rcsid[] _U_ =
-    "@(#) $Header: /tcpdump/master/libpcap/pcap-linux.c,v 1.110.2.14 2006/10/12 17:26:58 guy Exp $ (LBL)";
-#endif
-
-/*
- * Known problems with 2.0[.x] kernels:
- *
- *   - The loopback device gives every packet twice; on 2.2[.x] kernels,
- *     if we use PF_PACKET, we can filter out the transmitted version
- *     of the packet by using data in the "sockaddr_ll" returned by
- *     "recvfrom()", but, on 2.0[.x] kernels, we have to use
- *     PF_INET/SOCK_PACKET, which means "recvfrom()" supplies a
- *     "sockaddr_pkt" which doesn't give us enough information to let
- *     us do that.
- *
- *   - We have to set the interface's IFF_PROMISC flag ourselves, if
- *     we're to run in promiscuous mode, which means we have to turn
- *     it off ourselves when we're done; the kernel doesn't keep track
- *     of how many sockets are listening promiscuously, which means
- *     it won't get turned off automatically when no sockets are
- *     listening promiscuously.  We catch "pcap_close()" and, for
- *     interfaces we put into promiscuous mode, take them out of
- *     promiscuous mode - which isn't necessarily the right thing to
- *     do, if another socket also requested promiscuous mode between
- *     the time when we opened the socket and the time when we close
- *     the socket.
- *
- *   - MSG_TRUNC isn't supported, so you can't specify that "recvfrom()"
- *     return the amount of data that you could have read, rather than
- *     the amount that was returned, so we can't just allocate a buffer
- *     whose size is the snapshot length and pass the snapshot length
- *     as the byte count, and also pass MSG_TRUNC, so that the return
- *     value tells us how long the packet was on the wire.
- *
- *     This means that, if we want to get the actual size of the packet,
- *     so we can return it in the "len" field of the packet header,
- *     we have to read the entire packet, not just the part that fits
- *     within the snapshot length, and thus waste CPU time copying data
- *     from the kernel that our caller won't see.
- *
- *     We have to get the actual size, and supply it in "len", because
- *     otherwise, the IP dissector in tcpdump, for example, will complain
- *     about "truncated-ip", as the packet will appear to have been
- *     shorter, on the wire, than the IP header said it should have been.
- */
-
-
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
-
-#include "pcap-int.h"
-#include "sll.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 */
-	  
-#include <errno.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <string.h>
-#include <sys/socket.h>
-#include <sys/ioctl.h>
-#include <sys/utsname.h>
-#include <net/if.h>
-#include <netinet/in.h>
-#include <linux/if_ether.h>
-#include <net/if_arp.h>
-
-/*
- * If PF_PACKET is defined, we can use {SOCK_RAW,SOCK_DGRAM}/PF_PACKET
- * sockets rather than SOCK_PACKET sockets.
- *
- * To use them, we include <linux/if_packet.h> rather than
- * <netpacket/packet.h>; we do so because
- *
- *	some Linux distributions (e.g., Slackware 4.0) have 2.2 or
- *	later kernels and libc5, and don't provide a <netpacket/packet.h>
- *	file;
- *
- *	not all versions of glibc2 have a <netpacket/packet.h> file
- *	that defines stuff needed for some of the 2.4-or-later-kernel
- *	features, so if the system has a 2.4 or later kernel, we
- *	still can't use those features.
- *
- * We're already including a number of other <linux/XXX.h> headers, and
- * this code is Linux-specific (no other OS has PF_PACKET sockets as
- * a raw packet capture mechanism), so it's not as if you gain any
- * useful portability by using <netpacket/packet.h>
- *
- * XXX - should we just include <linux/if_packet.h> even if PF_PACKET
- * isn't defined?  It only defines one data structure in 2.0.x, so
- * it shouldn't cause any problems.
- */
-#ifdef PF_PACKET
-# include <linux/if_packet.h>
-
- /*
-  * On at least some Linux distributions (for example, Red Hat 5.2),
-  * there's no <netpacket/packet.h> file, but PF_PACKET is defined if
-  * you include <sys/socket.h>, but <linux/if_packet.h> doesn't define
-  * any of the PF_PACKET stuff such as "struct sockaddr_ll" or any of
-  * the PACKET_xxx stuff.
-  *
-  * So we check whether PACKET_HOST is defined, and assume that we have
-  * PF_PACKET sockets only if it is defined.
-  */
-# ifdef PACKET_HOST
-#  define HAVE_PF_PACKET_SOCKETS
-# endif /* PACKET_HOST */
-#endif /* PF_PACKET */
-
-#ifdef SO_ATTACH_FILTER
-#include <linux/types.h>
-#include <linux/filter.h>
-#endif
-
-#ifndef __GLIBC__
-typedef int		socklen_t;
-#endif
-
-#ifndef MSG_TRUNC
-/*
- * This is being compiled on a system that lacks MSG_TRUNC; define it
- * with the value it has in the 2.2 and later kernels, so that, on
- * those kernels, when we pass it in the flags argument to "recvfrom()"
- * we're passing the right value and thus get the MSG_TRUNC behavior
- * we want.  (We don't get that behavior on 2.0[.x] kernels, because
- * they didn't support MSG_TRUNC.)
- */
-#define MSG_TRUNC	0x20
-#endif
-
-#ifndef SOL_PACKET
-/*
- * This is being compiled on a system that lacks SOL_PACKET; define it
- * with the value it has in the 2.2 and later kernels, so that we can
- * set promiscuous mode in the good modern way rather than the old
- * 2.0-kernel crappy way.
- */
-#define SOL_PACKET	263
-#endif
-
-#define MAX_LINKHEADER_SIZE	256
-
-/*
- * When capturing on all interfaces we use this as the buffer size.
- * Should be bigger then all MTUs that occur in real life.
- * 64kB should be enough for now.
- */
-#define BIGGER_THAN_ALL_MTUS	(64*1024)
-
-/*
- * Prototypes for internal functions
- */
-static void map_arphrd_to_dlt(pcap_t *, int, int);
-static int live_open_old(pcap_t *, const char *, int, int, char *);
-static int live_open_new(pcap_t *, const char *, int, int, char *);
-static int pcap_read_linux(pcap_t *, int, pcap_handler, u_char *);
-static int pcap_read_packet(pcap_t *, pcap_handler, u_char *);
-static int pcap_inject_linux(pcap_t *, const void *, size_t);
-static int pcap_stats_linux(pcap_t *, struct pcap_stat *);
-static int pcap_setfilter_linux(pcap_t *, struct bpf_program *);
-static int pcap_setdirection_linux(pcap_t *, pcap_direction_t);
-static void pcap_close_linux(pcap_t *);
-
-/*
- * Wrap some ioctl calls
- */
-#ifdef HAVE_PF_PACKET_SOCKETS
-static int	iface_get_id(int fd, const char *device, char *ebuf);
-#endif
-static int	iface_get_mtu(int fd, const char *device, char *ebuf);
-static int 	iface_get_arptype(int fd, const char *device, char *ebuf);
-#ifdef HAVE_PF_PACKET_SOCKETS
-static int 	iface_bind(int fd, int ifindex, char *ebuf);
-#endif
-static int 	iface_bind_old(int fd, const char *device, char *ebuf);
-
-#ifdef SO_ATTACH_FILTER
-static int	fix_program(pcap_t *handle, struct sock_fprog *fcode);
-static int	fix_offset(struct bpf_insn *p);
-static int	set_kernel_filter(pcap_t *handle, struct sock_fprog *fcode);
-static int	reset_kernel_filter(pcap_t *handle);
-
-static struct sock_filter	total_insn
-	= BPF_STMT(BPF_RET | BPF_K, 0);
-static struct sock_fprog	total_fcode
-	= { 1, &total_insn };
-#endif
-
-/*
- *  Get a handle for a live capture from the given device. You can
- *  pass NULL as device to get all packages (without link level
- *  information of course). If you pass 1 as promisc the interface
- *  will be set to promiscous mode (XXX: I think this usage should
- *  be deprecated and functions be added to select that later allow
- *  modification of that values -- Torsten).
- *
- *  See also pcap(3).
- */
-pcap_t *
-pcap_open_live(const char *device, int snaplen, int promisc, int to_ms,
-    char *ebuf)
-{
-	pcap_t		*handle;
-	int		mtu;
-	int		err;
-	int		live_open_ok = 0;
-	struct utsname	utsname;
-
-#ifdef HAVE_DAG_API
-	if (strstr(device, "dag")) {
-		return dag_open_live(device, snaplen, promisc, to_ms, ebuf);
-	}
-#endif /* HAVE_DAG_API */
-
-#ifdef HAVE_SEPTEL_API
-	if (strstr(device, "septel")) {
-		return septel_open_live(device, snaplen, promisc, to_ms, ebuf);
-	}
-#endif /* HAVE_SEPTEL_API */
-
-	/* Allocate a handle for this session. */
-
-	handle = malloc(sizeof(*handle));
-	if (handle == NULL) {
-		snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s",
-			 pcap_strerror(errno));
-		return NULL;
-	}
-
-	/* Initialize some components of the pcap structure. */
-
-	memset(handle, 0, sizeof(*handle));
-	handle->snapshot	= snaplen;
-	handle->md.timeout	= to_ms;
-
-	/*
-	 * NULL and "any" are special devices which give us the hint to
-	 * monitor all devices.
-	 */
-	if (!device || strcmp(device, "any") == 0) {
-		device			= NULL;
-		handle->md.device	= strdup("any");
-		if (promisc) {
-			promisc = 0;
-			/* Just a warning. */
-			snprintf(ebuf, PCAP_ERRBUF_SIZE,
-			    "Promiscuous mode not supported on the \"any\" device");
-		}
-
-	} else
-		handle->md.device	= strdup(device);
-
-	if (handle->md.device == NULL) {
-		snprintf(ebuf, PCAP_ERRBUF_SIZE, "strdup: %s",
-			 pcap_strerror(errno) );
-		free(handle);
-		return NULL;
-	}
-
-	/*
-	 * Current Linux kernels use the protocol family PF_PACKET to
-	 * allow direct access to all packets on the network while
-	 * older kernels had a special socket type SOCK_PACKET to
-	 * implement this feature.
-	 * While this old implementation is kind of obsolete we need
-	 * to be compatible with older kernels for a while so we are
-	 * trying both methods with the newer method preferred.
-	 */
-
-	if ((err = live_open_new(handle, device, promisc, to_ms, ebuf)) == 1)
-		live_open_ok = 1;
-	else if (err == 0) {
-		/* Non-fatal error; try old way */
-		if (live_open_old(handle, device, promisc, to_ms, ebuf))
-			live_open_ok = 1;
-	}
-	if (!live_open_ok) {
-		/*
-		 * Both methods to open the packet socket failed. Tidy
-		 * up and report our failure (ebuf is expected to be
-		 * set by the functions above).
-		 */
-
-		if (handle->md.device != NULL)
-			free(handle->md.device);
-		free(handle);
-		return NULL;
-	}
-
-	/*
-	 * Compute the buffer size.
-	 *
-	 * If we're using SOCK_PACKET, this might be a 2.0[.x] kernel,
-	 * and might require special handling - check.
-	 */
-	if (handle->md.sock_packet && (uname(&utsname) < 0 ||
-	    strncmp(utsname.release, "2.0", 3) == 0)) {
-		/*
-		 * We're using a SOCK_PACKET structure, and either
-		 * we couldn't find out what kernel release this is,
-		 * or it's a 2.0[.x] kernel.
-		 *
-		 * In the 2.0[.x] kernel, a "recvfrom()" on
-		 * a SOCK_PACKET socket, with MSG_TRUNC set, will
-		 * return the number of bytes read, so if we pass
-		 * a length based on the snapshot length, it'll
-		 * return the number of bytes from the packet
-		 * copied to userland, not the actual length
-		 * of the packet.
-		 *
-		 * This means that, for example, the IP dissector
-		 * in tcpdump will get handed a packet length less
-		 * than the length in the IP header, and will
-		 * complain about "truncated-ip".
-		 *
-		 * So we don't bother trying to copy from the
-		 * kernel only the bytes in which we're interested,
-		 * but instead copy them all, just as the older
-		 * versions of libpcap for Linux did.
-		 *
-		 * The buffer therefore needs to be big enough to
-		 * hold the largest packet we can get from this
-		 * device.  Unfortunately, we can't get the MRU
-		 * of the network; we can only get the MTU.  The
-		 * MTU may be too small, in which case a packet larger
-		 * than the buffer size will be truncated *and* we
-		 * won't get the actual packet size.
-		 *
-		 * However, if the snapshot length is larger than
-		 * the buffer size based on the MTU, we use the
-		 * snapshot length as the buffer size, instead;
-		 * this means that with a sufficiently large snapshot
-		 * length we won't artificially truncate packets
-		 * to the MTU-based size.
-		 *
-		 * This mess just one of many problems with packet
-		 * capture on 2.0[.x] kernels; you really want a
-		 * 2.2[.x] or later kernel if you want packet capture
-		 * to work well.
-		 */
-		mtu = iface_get_mtu(handle->fd, device, ebuf);
-		if (mtu == -1) {
-			pcap_close_linux(handle);
-			free(handle);
-			return NULL;
-		}
-		handle->bufsize = MAX_LINKHEADER_SIZE + mtu;
-		if (handle->bufsize < handle->snapshot)
-			handle->bufsize = handle->snapshot;
-	} else {
-		/*
-		 * This is a 2.2[.x] or later kernel (we know that
-		 * either because we're not using a SOCK_PACKET
-		 * socket - PF_PACKET is supported only in 2.2
-		 * and later kernels - or because we checked the
-		 * kernel version).
-		 *
-		 * We can safely pass "recvfrom()" a byte count
-		 * based on the snapshot length.
-		 *
-		 * If we're in cooked mode, make the snapshot length
-		 * large enough to hold a "cooked mode" header plus
-		 * 1 byte of packet data (so we don't pass a byte
-		 * count of 0 to "recvfrom()").
-		 */
-		if (handle->md.cooked) {
-			if (handle->snapshot < SLL_HDR_LEN + 1)
-				handle->snapshot = SLL_HDR_LEN + 1;
-		}
-		handle->bufsize = handle->snapshot;
-	}
-
-	/* Allocate the buffer */
-
-	handle->buffer	 = malloc(handle->bufsize + handle->offset);
-	if (!handle->buffer) {
-	        snprintf(ebuf, PCAP_ERRBUF_SIZE,
-			 "malloc: %s", pcap_strerror(errno));
-		pcap_close_linux(handle);
-		free(handle);
-		return NULL;
-	}
-
-	/*
-	 * "handle->fd" is a socket, so "select()" and "poll()"
-	 * should work on it.
-	 */
-	handle->selectable_fd = handle->fd;
-
-	handle->read_op = pcap_read_linux;
-	handle->inject_op = pcap_inject_linux;
-	handle->setfilter_op = pcap_setfilter_linux;
-	handle->setdirection_op = pcap_setdirection_linux;
-	handle->set_datalink_op = NULL;	/* can't change data link type */
-	handle->getnonblock_op = pcap_getnonblock_fd;
-	handle->setnonblock_op = pcap_setnonblock_fd;
-	handle->stats_op = pcap_stats_linux;
-	handle->close_op = pcap_close_linux;
-
-	return handle;
-}
-
-/*
- *  Read at most max_packets from the capture stream and call the callback
- *  for each of them. Returns the number of packets handled or -1 if an
- *  error occured.
- */
-static int
-pcap_read_linux(pcap_t *handle, int max_packets, pcap_handler callback, u_char *user)
-{
-	/*
-	 * Currently, on Linux only one packet is delivered per read,
-	 * so we don't loop.
-	 */
-	return pcap_read_packet(handle, callback, user);
-}
-
-/*
- *  Read a packet from the socket calling the handler provided by
- *  the user. Returns the number of packets received or -1 if an
- *  error occured.
- */
-static int
-pcap_read_packet(pcap_t *handle, pcap_handler callback, u_char *userdata)
-{
-	u_char			*bp;
-	int			offset;
-#ifdef HAVE_PF_PACKET_SOCKETS
-	struct sockaddr_ll	from;
-	struct sll_header	*hdrp;
-#else
-	struct sockaddr		from;
-#endif
-	socklen_t		fromlen;
-	int			packet_len, caplen;
-	struct pcap_pkthdr	pcap_header;
-
-#ifdef HAVE_PF_PACKET_SOCKETS
-	/*
-	 * If this is a cooked device, leave extra room for a
-	 * fake packet header.
-	 */
-	if (handle->md.cooked)
-		offset = SLL_HDR_LEN;
-	else
-		offset = 0;
-#else
-	/*
-	 * This system doesn't have PF_PACKET sockets, so it doesn't
-	 * support cooked devices.
-	 */
-	offset = 0;
-#endif
-
-	/* Receive a single packet from the kernel */
-
-	bp = handle->buffer + handle->offset;
-	do {
-		/*
-		 * Has "pcap_breakloop()" been called?
-		 */
-		if (handle->break_loop) {
-			/*
-			 * Yes - clear the flag that indicates that it
-			 * has, and return -2 as an indication that we
-			 * were told to break out of the loop.
-			 */
-			handle->break_loop = 0;
-			return -2;
-		}
-		fromlen = sizeof(from);
-		packet_len = recvfrom(
-			handle->fd, bp + offset,
-			handle->bufsize - offset, MSG_TRUNC,
-			(struct sockaddr *) &from, &fromlen);
-	} while (packet_len == -1 && errno == EINTR);
-
-	/* Check if an error occured */
-
-	if (packet_len == -1) {
-		if (errno == EAGAIN)
-			return 0;	/* no packet there */
-		else {
-			snprintf(handle->errbuf, sizeof(handle->errbuf),
-				 "recvfrom: %s", pcap_strerror(errno));
-			return -1;
-		}
-	}
-
-#ifdef HAVE_PF_PACKET_SOCKETS
-	if (!handle->md.sock_packet) {
-		/*
-		 * Unfortunately, there is a window between socket() and
-		 * bind() where the kernel may queue packets from any
-		 * interface.  If we're bound to a particular interface,
-		 * discard packets not from that interface.
-		 *
-		 * (If socket filters are supported, we could do the
-		 * same thing we do when changing the filter; however,
-		 * that won't handle packet sockets without socket
-		 * filter support, and it's a bit more complicated.
-		 * It would save some instructions per packet, however.)
-		 */
-		if (handle->md.ifindex != -1 &&
-		    from.sll_ifindex != handle->md.ifindex)
-			return 0;
-
-		/*
-		 * Do checks based on packet direction.
-		 * We can only do this if we're using PF_PACKET; the
-		 * address returned for SOCK_PACKET is a "sockaddr_pkt"
-		 * which lacks the relevant packet type information.
-		 */
-		if (from.sll_pkttype == PACKET_OUTGOING) {
-			/*
-			 * Outgoing packet.
-			 * If this is from the loopback device, reject it;
-			 * we'll see the packet as an incoming packet as well,
-			 * and we don't want to see it twice.
-			 */
-			if (from.sll_ifindex == handle->md.lo_ifindex)
-				return 0;
-
-			/*
-			 * If the user only wants incoming packets, reject it.
-			 */
-			if (handle->direction == PCAP_D_IN)
-				return 0;
-		} else {
-			/*
-			 * Incoming packet.
-			 * If the user only wants outgoing packets, reject it.
-			 */
-			if (handle->direction == PCAP_D_OUT)
-				return 0;
-		}
-	}
-#endif
-
-#ifdef HAVE_PF_PACKET_SOCKETS
-	/*
-	 * If this is a cooked device, fill in the fake packet header.
-	 */
-	if (handle->md.cooked) {
-		/*
-		 * Add the length of the fake header to the length
-		 * of packet data we read.
-		 */
-		packet_len += SLL_HDR_LEN;
-
-		hdrp = (struct sll_header *)bp;
-
-		/*
-		 * Map the PACKET_ value to a LINUX_SLL_ value; we
-		 * want the same numerical value to be used in
-		 * the link-layer header even if the numerical values
-		 * for the PACKET_ #defines change, so that programs
-		 * that look at the packet type field will always be
-		 * able to handle DLT_LINUX_SLL captures.
-		 */
-		switch (from.sll_pkttype) {
-
-		case PACKET_HOST:
-			hdrp->sll_pkttype = htons(LINUX_SLL_HOST);
-			break;
-
-		case PACKET_BROADCAST:
-			hdrp->sll_pkttype = htons(LINUX_SLL_BROADCAST);
-			break;
-
-		case PACKET_MULTICAST:
-			hdrp->sll_pkttype = htons(LINUX_SLL_MULTICAST);
-			break;
-
-		case PACKET_OTHERHOST:
-			hdrp->sll_pkttype = htons(LINUX_SLL_OTHERHOST);
-			break;
-
-		case PACKET_OUTGOING:
-			hdrp->sll_pkttype = htons(LINUX_SLL_OUTGOING);
-			break;
-
-		default:
-			hdrp->sll_pkttype = -1;
-			break;
-		}
-
-		hdrp->sll_hatype = htons(from.sll_hatype);
-		hdrp->sll_halen = htons(from.sll_halen);
-		memcpy(hdrp->sll_addr, from.sll_addr,
-		    (from.sll_halen > SLL_ADDRLEN) ?
-		      SLL_ADDRLEN :
-		      from.sll_halen);
-		hdrp->sll_protocol = from.sll_protocol;
-	}
-#endif
-
-	/*
-	 * XXX: According to the kernel source we should get the real
-	 * packet len if calling recvfrom with MSG_TRUNC set. It does
-	 * not seem to work here :(, but it is supported by this code
-	 * anyway.
-	 * To be honest the code RELIES on that feature so this is really
-	 * broken with 2.2.x kernels.
-	 * I spend a day to figure out what's going on and I found out
-	 * that the following is happening:
-	 *
-	 * The packet comes from a random interface and the packet_rcv
-	 * hook is called with a clone of the packet. That code inserts
-	 * the packet into the receive queue of the packet socket.
-	 * If a filter is attached to that socket that filter is run
-	 * first - and there lies the problem. The default filter always
-	 * cuts the packet at the snaplen:
-	 *
-	 * # tcpdump -d
-	 * (000) ret      #68
-	 *
-	 * So the packet filter cuts down the packet. The recvfrom call
-	 * says "hey, it's only 68 bytes, it fits into the buffer" with
-	 * the result that we don't get the real packet length. This
-	 * is valid at least until kernel 2.2.17pre6.
-	 *
-	 * We currently handle this by making a copy of the filter
-	 * program, fixing all "ret" instructions with non-zero
-	 * operands to have an operand of 65535 so that the filter
-	 * doesn't truncate the packet, and supplying that modified
-	 * filter to the kernel.
-	 */
-
-	caplen = packet_len;
-	if (caplen > handle->snapshot)
-		caplen = handle->snapshot;
-
-	/* Run the packet filter if not using kernel filter */
-	if (!handle->md.use_bpf && handle->fcode.bf_insns) {
-		if (bpf_filter(handle->fcode.bf_insns, bp,
-		                packet_len, caplen) == 0)
-		{
-			/* rejected by filter */
-			return 0;
-		}
-	}
-
-	/* Fill in our own header data */
-
-	if (ioctl(handle->fd, SIOCGSTAMP, &pcap_header.ts) == -1) {
-		snprintf(handle->errbuf, sizeof(handle->errbuf),
-			 "SIOCGSTAMP: %s", pcap_strerror(errno));
-		return -1;
-	}
-	pcap_header.caplen	= caplen;
-	pcap_header.len		= packet_len;
-
-	/*
-	 * Count the packet.
-	 *
-	 * Arguably, we should count them before we check the filter,
-	 * as on many other platforms "ps_recv" counts packets
-	 * handed to the filter rather than packets that passed
-	 * the filter, but if filtering is done in the kernel, we
-	 * can't get a count of packets that passed the filter,
-	 * and that would mean the meaning of "ps_recv" wouldn't
-	 * be the same on all Linux systems.
-	 *
-	 * XXX - it's not the same on all systems in any case;
-	 * ideally, we should have a "get the statistics" call
-	 * that supplies more counts and indicates which of them
-	 * it supplies, so that we supply a count of packets
-	 * handed to the filter only on platforms where that
-	 * information is available.
-	 *
-	 * We count them here even if we can get the packet count
-	 * from the kernel, as we can only determine at run time
-	 * whether we'll be able to get it from the kernel (if
-	 * HAVE_TPACKET_STATS isn't defined, we can't get it from
-	 * the kernel, but if it is defined, the library might
-	 * have been built with a 2.4 or later kernel, but we
-	 * might be running on a 2.2[.x] kernel without Alexey
-	 * Kuznetzov's turbopacket patches, and thus the kernel
-	 * might not be able to supply those statistics).  We
-	 * could, I guess, try, when opening the socket, to get
-	 * the statistics, and if we can not increment the count
-	 * here, but it's not clear that always incrementing
-	 * the count is more expensive than always testing a flag
-	 * in memory.
-	 *
-	 * We keep the count in "md.packets_read", and use that for
-	 * "ps_recv" if we can't get the statistics from the kernel.
-	 * We do that because, if we *can* get the statistics from
-	 * the kernel, we use "md.stat.ps_recv" and "md.stat.ps_drop"
-	 * as running counts, as reading the statistics from the
-	 * kernel resets the kernel statistics, and if we directly
-	 * increment "md.stat.ps_recv" here, that means it will
-	 * count packets *twice* on systems where we can get kernel
-	 * statistics - once here, and once in pcap_stats_linux().
-	 */
-	handle->md.packets_read++;
-
-	/* Call the user supplied callback function */
-	callback(userdata, &pcap_header, bp);
-
-	return 1;
-}
-
-static int
-pcap_inject_linux(pcap_t *handle, const void *buf, size_t size)
-{
-	int ret;
-
-#ifdef HAVE_PF_PACKET_SOCKETS
-	if (!handle->md.sock_packet) {
-		/* PF_PACKET socket */
-		if (handle->md.ifindex == -1) {
-			/*
-			 * We don't support sending on the "any" device.
-			 */
-			strlcpy(handle->errbuf,
-			    "Sending packets isn't supported on the \"any\" device",
-			    PCAP_ERRBUF_SIZE);
-			return (-1);
-		}
-
-		if (handle->md.cooked) {
-			/*
-			 * We don't support sending on the "any" device.
-			 *
-			 * XXX - how do you send on a bound cooked-mode
-			 * socket?
-			 * Is a "sendto()" required there?
-			 */
-			strlcpy(handle->errbuf,
-			    "Sending packets isn't supported in cooked mode",
-			    PCAP_ERRBUF_SIZE);
-			return (-1);
-		}
-	}
-#endif
-
-	ret = send(handle->fd, buf, size, 0);
-	if (ret == -1) {
-		snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "send: %s",
-		    pcap_strerror(errno));
-		return (-1);
-	}
-	return (ret);
-}                           
-
-/*
- *  Get the statistics for the given packet capture handle.
- *  Reports the number of dropped packets iff the kernel supports
- *  the PACKET_STATISTICS "getsockopt()" argument (2.4 and later
- *  kernels, and 2.2[.x] kernels with Alexey Kuznetzov's turbopacket
- *  patches); otherwise, that information isn't available, and we lie
- *  and report 0 as the count of dropped packets.
- */
-static int
-pcap_stats_linux(pcap_t *handle, struct pcap_stat *stats)
-{
-#ifdef HAVE_TPACKET_STATS
-	struct tpacket_stats kstats;
-	socklen_t len = sizeof (struct tpacket_stats);
-#endif
-
-#ifdef HAVE_TPACKET_STATS
-	/*
-	 * Try to get the packet counts from the kernel.
-	 */
-	if (getsockopt(handle->fd, SOL_PACKET, PACKET_STATISTICS,
-			&kstats, &len) > -1) {
-		/*
-		 * On systems where the PACKET_STATISTICS "getsockopt()"
-		 * argument is supported on PF_PACKET sockets:
-		 *
-		 *	"ps_recv" counts only packets that *passed* the
-		 *	filter, not packets that didn't pass the filter.
-		 *	This includes packets later dropped because we
-		 *	ran out of buffer space.
-		 *
-		 *	"ps_drop" counts packets dropped because we ran
-		 *	out of buffer space.  It doesn't count packets
-		 *	dropped by the interface driver.  It counts only
-		 *	packets that passed the filter.
-		 *
-		 *	Both statistics include packets not yet read from
-		 *	the kernel by libpcap, and thus not yet seen by
-		 *	the application.
-		 *
-		 * In "linux/net/packet/af_packet.c", at least in the
-		 * 2.4.9 kernel, "tp_packets" is incremented for every
-		 * packet that passes the packet filter *and* is
-		 * successfully queued on the socket; "tp_drops" is
-		 * incremented for every packet dropped because there's
-		 * not enough free space in the socket buffer.
-		 *
-		 * When the statistics are returned for a PACKET_STATISTICS
-		 * "getsockopt()" call, "tp_drops" is added to "tp_packets",
-		 * so that "tp_packets" counts all packets handed to
-		 * the PF_PACKET socket, including packets dropped because
-		 * there wasn't room on the socket buffer - but not
-		 * including packets that didn't pass the filter.
-		 *
-		 * In the BSD BPF, the count of received packets is
-		 * incremented for every packet handed to BPF, regardless
-		 * of whether it passed the filter.
-		 *
-		 * We can't make "pcap_stats()" work the same on both
-		 * platforms, but the best approximation is to return
-		 * "tp_packets" as the count of packets and "tp_drops"
-		 * as the count of drops.
-		 *
-		 * Keep a running total because each call to 
-		 *    getsockopt(handle->fd, SOL_PACKET, PACKET_STATISTICS, ....
-		 * resets the counters to zero.
-		 */
-		handle->md.stat.ps_recv += kstats.tp_packets;
-		handle->md.stat.ps_drop += kstats.tp_drops;
-		*stats = handle->md.stat;
-		return 0;
-	}
-	else
-	{
-		/*
-		 * If the error was EOPNOTSUPP, fall through, so that
-		 * if you build the library on a system with
-		 * "struct tpacket_stats" and run it on a system
-		 * that doesn't, it works as it does if the library
-		 * is built on a system without "struct tpacket_stats".
-		 */
-		if (errno != EOPNOTSUPP) {
-			snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
-			    "pcap_stats: %s", pcap_strerror(errno));
-			return -1;
-		}
-	}
-#endif
-	/*
-	 * On systems where the PACKET_STATISTICS "getsockopt()" argument
-	 * is not supported on PF_PACKET sockets:
-	 *
-	 *	"ps_recv" counts only packets that *passed* the filter,
-	 *	not packets that didn't pass the filter.  It does not
-	 *	count packets dropped because we ran out of buffer
-	 *	space.
-	 *
-	 *	"ps_drop" is not supported.
-	 *
-	 *	"ps_recv" doesn't include packets not yet read from
-	 *	the kernel by libpcap.
-	 *
-	 * We maintain the count of packets processed by libpcap in
-	 * "md.packets_read", for reasons described in the comment
-	 * at the end of pcap_read_packet().  We have no idea how many
-	 * packets were dropped.
-	 */
-	stats->ps_recv = handle->md.packets_read;
-	stats->ps_drop = 0;
-	return 0;
-}
-
-/*
- * Description string for the "any" device.
- */
-static const char any_descr[] = "Pseudo-device that captures on all interfaces";
-
-int
-pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf)
-{
-	if (pcap_add_if(alldevsp, "any", 0, any_descr, errbuf) < 0)
-		return (-1);
-
-#ifdef HAVE_DAG_API
-	if (dag_platform_finddevs(alldevsp, errbuf) < 0)
-		return (-1);
-#endif /* HAVE_DAG_API */
-
-#ifdef HAVE_SEPTEL_API
-	if (septel_platform_finddevs(alldevsp, errbuf) < 0)
-		return (-1);
-#endif /* HAVE_SEPTEL_API */
-
-	return (0);
-}
-
-/*
- *  Attach the given BPF code to the packet capture device.
- */
-static int
-pcap_setfilter_linux(pcap_t *handle, struct bpf_program *filter)
-{
-#ifdef SO_ATTACH_FILTER
-	struct sock_fprog	fcode;
-	int			can_filter_in_kernel;
-	int			err = 0;
-#endif
-
-	if (!handle)
-		return -1;
-	if (!filter) {
-	        strncpy(handle->errbuf, "setfilter: No filter specified",
-			sizeof(handle->errbuf));
-		return -1;
-	}
-
-	/* Make our private copy of the filter */
-
-	if (install_bpf_program(handle, filter) < 0)
-		/* install_bpf_program() filled in errbuf */
-		return -1;
-
-	/*
-	 * Run user level packet filter by default. Will be overriden if
-	 * installing a kernel filter succeeds.
-	 */
-	handle->md.use_bpf = 0;
-
-	/* Install kernel level filter if possible */
-
-#ifdef SO_ATTACH_FILTER
-#ifdef USHRT_MAX
-	if (handle->fcode.bf_len > USHRT_MAX) {
-		/*
-		 * fcode.len is an unsigned short for current kernel.
-		 * I have yet to see BPF-Code with that much
-		 * instructions but still it is possible. So for the
-		 * sake of correctness I added this check.
-		 */
-		fprintf(stderr, "Warning: Filter too complex for kernel\n");
-		fcode.len = 0;
-		fcode.filter = NULL;
-		can_filter_in_kernel = 0;
-	} else
-#endif /* USHRT_MAX */
-	{
-		/*
-		 * Oh joy, the Linux kernel uses struct sock_fprog instead
-		 * of struct bpf_program and of course the length field is
-		 * of different size. Pointed out by Sebastian
-		 *
-		 * Oh, and we also need to fix it up so that all "ret"
-		 * instructions with non-zero operands have 65535 as the
-		 * operand, and so that, if we're in cooked mode, all
-		 * memory-reference instructions use special magic offsets
-		 * in references to the link-layer header and assume that
-		 * the link-layer payload begins at 0; "fix_program()"
-		 * will do that.
-		 */
-		switch (fix_program(handle, &fcode)) {
-
-		case -1:
-		default:
-			/*
-			 * Fatal error; just quit.
-			 * (The "default" case shouldn't happen; we
-			 * return -1 for that reason.)
-			 */
-			return -1;
-
-		case 0:
-			/*
-			 * The program performed checks that we can't make
-			 * work in the kernel.
-			 */
-			can_filter_in_kernel = 0;
-			break;
-
-		case 1:
-			/*
-			 * We have a filter that'll work in the kernel.
-			 */
-			can_filter_in_kernel = 1;
-			break;
-		}
-	}
-
-	if (can_filter_in_kernel) {
-		if ((err = set_kernel_filter(handle, &fcode)) == 0)
-		{
-			/* Installation succeded - using kernel filter. */
-			handle->md.use_bpf = 1;
-		}
-		else if (err == -1)	/* Non-fatal error */
-		{
-			/*
-			 * Print a warning if we weren't able to install
-			 * the filter for a reason other than "this kernel
-			 * isn't configured to support socket filters.
-			 */
-			if (errno != ENOPROTOOPT && errno != EOPNOTSUPP) {
-				fprintf(stderr,
-				    "Warning: Kernel filter failed: %s\n",
-					pcap_strerror(errno));
-			}
-		}
-	}
-
-	/*
-	 * If we're not using the kernel filter, get rid of any kernel
-	 * filter that might've been there before, e.g. because the
-	 * previous filter could work in the kernel, or because some other
-	 * code attached a filter to the socket by some means other than
-	 * calling "pcap_setfilter()".  Otherwise, the kernel filter may
-	 * filter out packets that would pass the new userland filter.
-	 */
-	if (!handle->md.use_bpf)
-		reset_kernel_filter(handle);
-
-	/*
-	 * Free up the copy of the filter that was made by "fix_program()".
-	 */
-	if (fcode.filter != NULL)
-		free(fcode.filter);
-
-	if (err == -2)
-		/* Fatal error */
-		return -1;
-#endif /* SO_ATTACH_FILTER */
-
-	return 0;
-}
-
-/*
- * Set direction flag: Which packets do we accept on a forwarding
- * single device? IN, OUT or both?
- */
-static int
-pcap_setdirection_linux(pcap_t *handle, pcap_direction_t d)
-{
-#ifdef HAVE_PF_PACKET_SOCKETS
-	if (!handle->md.sock_packet) {
-		handle->direction = d;
-		return 0;
-	}
-#endif
-	/*
-	 * We're not using PF_PACKET sockets, so we can't determine
-	 * the direction of the packet.
-	 */
-	snprintf(handle->errbuf, sizeof(handle->errbuf),
-	    "Setting direction is not supported on SOCK_PACKET sockets");
-	return -1;
-}
-
-/*
- *  Linux uses the ARP hardware type to identify the type of an
- *  interface. pcap uses the DLT_xxx constants for this. This
- *  function takes a pointer to a "pcap_t", and an ARPHRD_xxx
- *  constant, as arguments, and sets "handle->linktype" to the
- *  appropriate DLT_XXX constant and sets "handle->offset" to
- *  the appropriate value (to make "handle->offset" plus link-layer
- *  header length be a multiple of 4, so that the link-layer payload
- *  will be aligned on a 4-byte boundary when capturing packets).
- *  (If the offset isn't set here, it'll be 0; add code as appropriate
- *  for cases where it shouldn't be 0.)
- *
- *  If "cooked_ok" is non-zero, we can use DLT_LINUX_SLL and capture
- *  in cooked mode; otherwise, we can't use cooked mode, so we have
- *  to pick some type that works in raw mode, or fail.
- *
- *  Sets the link type to -1 if unable to map the type.
- */
-static void map_arphrd_to_dlt(pcap_t *handle, int arptype, int cooked_ok)
-{
-	switch (arptype) {
-
-	case ARPHRD_ETHER:
-		/*
-		 * This is (presumably) a real Ethernet capture; give it a
-		 * link-layer-type list with DLT_EN10MB and DLT_DOCSIS, so
-		 * that an application can let you choose it, in case you're
-		 * capturing DOCSIS traffic that a Cisco Cable Modem
-		 * Termination System is putting out onto an Ethernet (it
-		 * doesn't put an Ethernet header onto the wire, it puts raw
-		 * DOCSIS frames out on the wire inside the low-level
-		 * Ethernet framing).
-		 *
-		 * XXX - are there any sorts of "fake Ethernet" that have
-		 * ARPHRD_ETHER but that *shouldn't offer DLT_DOCSIS as
-		 * a Cisco CMTS won't put traffic onto it or get traffic
-		 * bridged onto it?  ISDN is handled in "live_open_new()",
-		 * as we fall back on cooked mode there; are there any
-		 * others?
-		 */
-		handle->dlt_list = (u_int *) malloc(sizeof(u_int) * 2);
-		/*
-		 * If that fails, just leave the list empty.
-		 */
-		if (handle->dlt_list != NULL) {
-			handle->dlt_list[0] = DLT_EN10MB;
-			handle->dlt_list[1] = DLT_DOCSIS;
-			handle->dlt_count = 2;
-		}
-		/* FALLTHROUGH */
-
-	case ARPHRD_METRICOM:
-	case ARPHRD_LOOPBACK:
-		handle->linktype = DLT_EN10MB;
-		handle->offset = 2;
-		break;
-
-	case ARPHRD_EETHER:
-		handle->linktype = DLT_EN3MB;
-		break;
-
-	case ARPHRD_AX25:
-		handle->linktype = DLT_AX25;
-		break;
-
-	case ARPHRD_PRONET:
-		handle->linktype = DLT_PRONET;
-		break;
-
-	case ARPHRD_CHAOS:
-		handle->linktype = DLT_CHAOS;
-		break;
-
-#ifndef ARPHRD_IEEE802_TR
-#define ARPHRD_IEEE802_TR 800	/* From Linux 2.4 */
-#endif
-	case ARPHRD_IEEE802_TR:
-	case ARPHRD_IEEE802:
-		handle->linktype = DLT_IEEE802;
-		handle->offset = 2;
-		break;
-
-	case ARPHRD_ARCNET:
-		handle->linktype = DLT_ARCNET_LINUX;
-		break;
-
-#ifndef ARPHRD_FDDI	/* From Linux 2.2.13 */
-#define ARPHRD_FDDI	774
-#endif
-	case ARPHRD_FDDI:
-		handle->linktype = DLT_FDDI;
-		handle->offset = 3;
-		break;
-
-#ifndef ARPHRD_ATM  /* FIXME: How to #include this? */
-#define ARPHRD_ATM 19
-#endif
-	case ARPHRD_ATM:
-		/*
-		 * The Classical IP implementation in ATM for Linux
-		 * supports both what RFC 1483 calls "LLC Encapsulation",
-		 * in which each packet has an LLC header, possibly
-		 * with a SNAP header as well, prepended to it, and
-		 * what RFC 1483 calls "VC Based Multiplexing", in which
-		 * different virtual circuits carry different network
-		 * layer protocols, and no header is prepended to packets.
-		 *
-		 * They both have an ARPHRD_ type of ARPHRD_ATM, so
-		 * you can't use the ARPHRD_ type to find out whether
-		 * captured packets will have an LLC header, and,
-		 * while there's a socket ioctl to *set* the encapsulation
-		 * type, there's no ioctl to *get* the encapsulation type.
-		 *
-		 * This means that
-		 *
-		 *	programs that dissect Linux Classical IP frames
-		 *	would have to check for an LLC header and,
-		 *	depending on whether they see one or not, dissect
-		 *	the frame as LLC-encapsulated or as raw IP (I
-		 *	don't know whether there's any traffic other than
-		 *	IP that would show up on the socket, or whether
-		 *	there's any support for IPv6 in the Linux
-		 *	Classical IP code);
-		 *
-		 *	filter expressions would have to compile into
-		 *	code that checks for an LLC header and does
-		 *	the right thing.
-		 *
-		 * Both of those are a nuisance - and, at least on systems
-		 * that support PF_PACKET sockets, we don't have to put
-		 * up with those nuisances; instead, we can just capture
-		 * in cooked mode.  That's what we'll do, if we can.
-		 * Otherwise, we'll just fail.
-		 */
-		if (cooked_ok)
-			handle->linktype = DLT_LINUX_SLL;
-		else
-			handle->linktype = -1;
-		break;
-
-#ifndef ARPHRD_IEEE80211  /* From Linux 2.4.6 */
-#define ARPHRD_IEEE80211 801
-#endif
-	case ARPHRD_IEEE80211:
-		handle->linktype = DLT_IEEE802_11;
-		break;
-
-#ifndef ARPHRD_IEEE80211_PRISM  /* From Linux 2.4.18 */
-#define ARPHRD_IEEE80211_PRISM 802
-#endif
-	case ARPHRD_IEEE80211_PRISM:
-		handle->linktype = DLT_PRISM_HEADER;
-		break;
-
-#ifndef ARPHRD_IEEE80211_RADIOTAP /* new */
-#define ARPHRD_IEEE80211_RADIOTAP 803
-#endif
-	case ARPHRD_IEEE80211_RADIOTAP:
-		handle->linktype = DLT_IEEE802_11_RADIO;
-		break;
-
-	case ARPHRD_PPP:
-		/*
-		 * Some PPP code in the kernel supplies no link-layer
-		 * header whatsoever to PF_PACKET sockets; other PPP
-		 * code supplies PPP link-layer headers ("syncppp.c");
-		 * some PPP code might supply random link-layer
-		 * headers (PPP over ISDN - there's code in Ethereal,
-		 * for example, to cope with PPP-over-ISDN captures
-		 * with which the Ethereal developers have had to cope,
-		 * heuristically trying to determine which of the
-		 * oddball link-layer headers particular packets have).
-		 *
-		 * As such, we just punt, and run all PPP interfaces
-		 * in cooked mode, if we can; otherwise, we just treat
-		 * it as DLT_RAW, for now - if somebody needs to capture,
-		 * on a 2.0[.x] kernel, on PPP devices that supply a
-		 * link-layer header, they'll have to add code here to
-		 * map to the appropriate DLT_ type (possibly adding a
-		 * new DLT_ type, if necessary).
-		 */
-		if (cooked_ok)
-			handle->linktype = DLT_LINUX_SLL;
-		else {
-			/*
-			 * XXX - handle ISDN types here?  We can't fall
-			 * back on cooked sockets, so we'd have to
-			 * figure out from the device name what type of
-			 * link-layer encapsulation it's using, and map
-			 * that to an appropriate DLT_ value, meaning
-			 * we'd map "isdnN" devices to DLT_RAW (they
-			 * supply raw IP packets with no link-layer
-			 * header) and "isdY" devices to a new DLT_I4L_IP
-			 * type that has only an Ethernet packet type as
-			 * a link-layer header.
-			 *
-			 * But sometimes we seem to get random crap
-			 * in the link-layer header when capturing on
-			 * ISDN devices....
-			 */
-			handle->linktype = DLT_RAW;
-		}
-		break;
-
-#ifndef ARPHRD_CISCO
-#define ARPHRD_CISCO 513 /* previously ARPHRD_HDLC */
-#endif
-	case ARPHRD_CISCO:
-		handle->linktype = DLT_C_HDLC;
-		break;
-
-	/* Not sure if this is correct for all tunnels, but it
-	 * works for CIPE */
-	case ARPHRD_TUNNEL:
-#ifndef ARPHRD_SIT
-#define ARPHRD_SIT 776	/* From Linux 2.2.13 */
-#endif
-	case ARPHRD_SIT:
-	case ARPHRD_CSLIP:
-	case ARPHRD_SLIP6:
-	case ARPHRD_CSLIP6:
-	case ARPHRD_ADAPT:
-	case ARPHRD_SLIP:
-#ifndef ARPHRD_RAWHDLC
-#define ARPHRD_RAWHDLC 518
-#endif
-	case ARPHRD_RAWHDLC:
-#ifndef ARPHRD_DLCI
-#define ARPHRD_DLCI 15
-#endif
-	case ARPHRD_DLCI:
-		/*
-		 * XXX - should some of those be mapped to DLT_LINUX_SLL
-		 * instead?  Should we just map all of them to DLT_LINUX_SLL?
-		 */
-		handle->linktype = DLT_RAW;
-		break;
-
-#ifndef ARPHRD_FRAD
-#define ARPHRD_FRAD 770
-#endif
-	case ARPHRD_FRAD:
-		handle->linktype = DLT_FRELAY;
-		break;
-
-	case ARPHRD_LOCALTLK:
-		handle->linktype = DLT_LTALK;
-		break;
-
-#ifndef ARPHRD_FCPP
-#define ARPHRD_FCPP	784
-#endif
-	case ARPHRD_FCPP:
-#ifndef ARPHRD_FCAL
-#define ARPHRD_FCAL	785
-#endif
-	case ARPHRD_FCAL:
-#ifndef ARPHRD_FCPL
-#define ARPHRD_FCPL	786
-#endif
-	case ARPHRD_FCPL:
-#ifndef ARPHRD_FCFABRIC
-#define ARPHRD_FCFABRIC	787
-#endif
-	case ARPHRD_FCFABRIC:
-		/*
-		 * We assume that those all mean RFC 2625 IP-over-
-		 * Fibre Channel, with the RFC 2625 header at
-		 * the beginning of the packet.
-		 */
-		handle->linktype = DLT_IP_OVER_FC;
-		break;
-
-#ifndef ARPHRD_IRDA
-#define ARPHRD_IRDA	783
-#endif
-	case ARPHRD_IRDA:
-		/* Don't expect IP packet out of this interfaces... */
-		handle->linktype = DLT_LINUX_IRDA;
-		/* We need to save packet direction for IrDA decoding,
-		 * so let's use "Linux-cooked" mode. Jean II */
-		//handle->md.cooked = 1;
-		break;
-
-	/* ARPHRD_LAPD is unofficial and randomly allocated, if reallocation
-	 * is needed, please report it to <daniele@orlandi.com> */
-#ifndef ARPHRD_LAPD
-#define ARPHRD_LAPD	8445
-#endif
-	case ARPHRD_LAPD:
-		/* Don't expect IP packet out of this interfaces... */
-		handle->linktype = DLT_LINUX_LAPD;
-		break;
-
-	default:
-		handle->linktype = -1;
-		break;
-	}
-}
-
-/* ===== Functions to interface to the newer kernels ================== */
-
-/*
- *  Try to open a packet socket using the new kernel interface.
- *  Returns 0 on failure.
- *  FIXME: 0 uses to mean success (Sebastian)
- */
-static int
-live_open_new(pcap_t *handle, const char *device, int promisc,
-	      int to_ms, char *ebuf)
-{
-#ifdef HAVE_PF_PACKET_SOCKETS
-	int			sock_fd = -1, arptype;
-	int			err;
-	int			fatal_err = 0;
-	struct packet_mreq	mr;
-
-	/* One shot loop used for error handling - bail out with break */
-
-	do {
-		/*
-		 * Open a socket with protocol family packet. If a device is
-		 * given we try to open it in raw mode otherwise we use
-		 * the cooked interface.
-		 */
-		sock_fd = device ?
-			socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL))
-		      : socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_ALL));
-
-		if (sock_fd == -1) {
-			snprintf(ebuf, PCAP_ERRBUF_SIZE, "socket: %s",
-				 pcap_strerror(errno) );
-			break;
-		}
-
-		/* It seems the kernel supports the new interface. */
-		handle->md.sock_packet = 0;
-
-		/*
-		 * Get the interface index of the loopback device.
-		 * If the attempt fails, don't fail, just set the
-		 * "md.lo_ifindex" to -1.
-		 *
-		 * XXX - can there be more than one device that loops
-		 * packets back, i.e. devices other than "lo"?  If so,
-		 * we'd need to find them all, and have an array of
-		 * indices for them, and check all of them in
-		 * "pcap_read_packet()".
-		 */
-		handle->md.lo_ifindex = iface_get_id(sock_fd, "lo", ebuf);
-
-		/*
-		 * Default value for offset to align link-layer payload
-		 * on a 4-byte boundary.
-		 */
-		handle->offset	 = 0;
-
-		/*
-		 * What kind of frames do we have to deal with? Fall back
-		 * to cooked mode if we have an unknown interface type.
-		 */
-
-		if (device) {
-			/* Assume for now we don't need cooked mode. */
-			handle->md.cooked = 0;
-
-			arptype	= iface_get_arptype(sock_fd, device, ebuf);
-			if (arptype == -1) {
-				fatal_err = 1;
-				break;
-			}
-			map_arphrd_to_dlt(handle, arptype, 1);
-			if (handle->linktype == -1 ||
-			    handle->linktype == DLT_LINUX_SLL ||
-			    handle->linktype == DLT_LINUX_IRDA ||
-			    handle->linktype == DLT_LINUX_LAPD ||
-			    (handle->linktype == DLT_EN10MB &&
-			     (strncmp("isdn", device, 4) == 0 ||
-			      strncmp("isdY", device, 4) == 0))) {
-				/*
-				 * Unknown interface type (-1), or a
-				 * device we explicitly chose to run
-				 * in cooked mode (e.g., PPP devices),
-				 * or an ISDN device (whose link-layer
-				 * type we can only determine by using
-				 * APIs that may be different on different
-				 * kernels) - reopen in cooked mode.
-				 */
-				if (close(sock_fd) == -1) {
-					snprintf(ebuf, PCAP_ERRBUF_SIZE,
-						 "close: %s", pcap_strerror(errno));
-					break;
-				}
-				sock_fd = socket(PF_PACKET, SOCK_DGRAM,
-						 htons(ETH_P_ALL));
-				if (sock_fd == -1) {
-					snprintf(ebuf, PCAP_ERRBUF_SIZE,
-						 "socket: %s", pcap_strerror(errno));
-					break;
-				}
-				handle->md.cooked = 1;
-
-				/*
-				 * Get rid of any link-layer type list
-				 * we allocated - this only supports cooked
-				 * capture.
-				 */
-				if (handle->dlt_list != NULL) {
-					free(handle->dlt_list);
-					handle->dlt_list = NULL;
-					handle->dlt_count = 0;
-				}
-
-				if (handle->linktype == -1) {
-					/*
-					 * Warn that we're falling back on
-					 * cooked mode; we may want to
-					 * update "map_arphrd_to_dlt()"
-					 * to handle the new type.
-					 */
-					snprintf(ebuf, PCAP_ERRBUF_SIZE,
-						"arptype %d not "
-						"supported by libpcap - "
-						"falling back to cooked "
-						"socket",
-						arptype);
-				}
-				/* IrDA capture is not a real "cooked" capture,
-				 * it's IrLAP frames, not IP packets. */
-				if (handle->linktype != DLT_LINUX_IRDA &&
-			    		handle->linktype != DLT_LINUX_LAPD)
-					handle->linktype = DLT_LINUX_SLL;
-			}
-
-			handle->md.ifindex = iface_get_id(sock_fd, device, ebuf);
-			if (handle->md.ifindex == -1)
-				break;
-
-			if ((err = iface_bind(sock_fd, handle->md.ifindex,
-			    ebuf)) < 0) {
-				if (err == -2)
-					fatal_err = 1;
-				break;
-			}
-		} else {
-			/*
-			 * This is cooked mode.
-			 */
-			handle->md.cooked = 1;
-			handle->linktype = DLT_LINUX_SLL;
-
-			/*
-			 * We're not bound to a device.
-			 * XXX - true?  Or true only if we're using
-			 * the "any" device?
-			 * For now, we're using this as an indication
-			 * that we can't transmit; stop doing that only
-			 * if we figure out how to transmit in cooked
-			 * mode.
-			 */
-			handle->md.ifindex = -1;
-		}
-
-		/*
-		 * Select promiscuous mode on if "promisc" is set.
-		 *
-		 * Do not turn allmulti mode on if we don't select
-		 * promiscuous mode - on some devices (e.g., Orinoco
-		 * wireless interfaces), allmulti mode isn't supported
-		 * and the driver implements it by turning promiscuous
-		 * mode on, and that screws up the operation of the
-		 * card as a normal networking interface, and on no
-		 * other platform I know of does starting a non-
-		 * promiscuous capture affect which multicast packets
-		 * are received by the interface.
-		 */
-
-		/*
-		 * Hmm, how can we set promiscuous mode on all interfaces?
-		 * I am not sure if that is possible at all.
-		 */
-
-		if (device && promisc) {
-			memset(&mr, 0, sizeof(mr));
-			mr.mr_ifindex = handle->md.ifindex;
-			mr.mr_type    = PACKET_MR_PROMISC;
-			if (setsockopt(sock_fd, SOL_PACKET,
-				PACKET_ADD_MEMBERSHIP, &mr, sizeof(mr)) == -1)
-			{
-				snprintf(ebuf, PCAP_ERRBUF_SIZE,
-					"setsockopt: %s", pcap_strerror(errno));
-				break;
-			}
-		}
-
-		/* Save the socket FD in the pcap structure */
-
-		handle->fd 	 = sock_fd;
-
-		return 1;
-
-	} while(0);
-
-	if (sock_fd != -1)
-		close(sock_fd);
-
-	if (fatal_err) {
-		/*
-		 * Get rid of any link-layer type list we allocated.
-		 */
-		if (handle->dlt_list != NULL)
-			free(handle->dlt_list);
-		return -2;
-	} else
-		return 0;
-#else
-	strncpy(ebuf,
-		"New packet capturing interface not supported by build "
-		"environment", PCAP_ERRBUF_SIZE);
-	return 0;
-#endif
-}
-
-#ifdef HAVE_PF_PACKET_SOCKETS
-/*
- *  Return the index of the given device name. Fill ebuf and return
- *  -1 on failure.
- */
-static int
-iface_get_id(int fd, const char *device, char *ebuf)
-{
-	struct ifreq	ifr;
-
-	memset(&ifr, 0, sizeof(ifr));
-	strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
-
-	if (ioctl(fd, SIOCGIFINDEX, &ifr) == -1) {
-		snprintf(ebuf, PCAP_ERRBUF_SIZE,
-			 "SIOCGIFINDEX: %s", pcap_strerror(errno));
-		return -1;
-	}
-
-	return ifr.ifr_ifindex;
-}
-
-/*
- *  Bind the socket associated with FD to the given device.
- */
-static int
-iface_bind(int fd, int ifindex, char *ebuf)
-{
-	struct sockaddr_ll	sll;
-	int			err;
-	socklen_t		errlen = sizeof(err);
-
-	memset(&sll, 0, sizeof(sll));
-	sll.sll_family		= AF_PACKET;
-	sll.sll_ifindex		= ifindex;
-	sll.sll_protocol	= htons(ETH_P_ALL);
-
-	if (bind(fd, (struct sockaddr *) &sll, sizeof(sll)) == -1) {
-		snprintf(ebuf, PCAP_ERRBUF_SIZE,
-			 "bind: %s", pcap_strerror(errno));
-		return -1;
-	}
-
-	/* Any pending errors, e.g., network is down? */
-
-	if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &err, &errlen) == -1) {
-		snprintf(ebuf, PCAP_ERRBUF_SIZE,
-			"getsockopt: %s", pcap_strerror(errno));
-		return -2;
-	}
-
-	if (err > 0) {
-		snprintf(ebuf, PCAP_ERRBUF_SIZE,
-			"bind: %s", pcap_strerror(err));
-		return -2;
-	}
-
-	return 0;
-}
-
-#endif
-
-
-/* ===== Functions to interface to the older kernels ================== */
-
-/*
- * With older kernels promiscuous mode is kind of interesting because we
- * have to reset the interface before exiting. The problem can't really
- * be solved without some daemon taking care of managing usage counts.
- * If we put the interface into promiscuous mode, we set a flag indicating
- * that we must take it out of that mode when the interface is closed,
- * and, when closing the interface, if that flag is set we take it out
- * of promiscuous mode.
- */
-
-/*
- * List of pcaps for which we turned promiscuous mode on by hand.
- * If there are any such pcaps, we arrange to call "pcap_close_all()"
- * when we exit, and have it close all of them to turn promiscuous mode
- * off.
- */
-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);
-}
-
-static void	pcap_close_linux( pcap_t *handle )
-{
-	struct pcap	*p, *prevp;
-	struct ifreq	ifr;
-
-	if (handle->md.clear_promisc) {
-		/*
-		 * We put the interface into promiscuous mode; take
-		 * it out of promiscuous mode.
-		 *
-		 * XXX - if somebody else wants it in promiscuous mode,
-		 * this code cannot know that, so it'll take it out
-		 * of promiscuous mode.  That's not fixable in 2.0[.x]
-		 * kernels.
-		 */
-		memset(&ifr, 0, sizeof(ifr));
-		strncpy(ifr.ifr_name, handle->md.device, sizeof(ifr.ifr_name));
-		if (ioctl(handle->fd, SIOCGIFFLAGS, &ifr) == -1) {
-			fprintf(stderr,
-			    "Can't restore interface flags (SIOCGIFFLAGS failed: %s).\n"
-			    "Please adjust manually.\n"
-			    "Hint: This can't happen with Linux >= 2.2.0.\n",
-			    strerror(errno));
-		} else {
-			if (ifr.ifr_flags & IFF_PROMISC) {
-				/*
-				 * Promiscuous mode is currently on; turn it
-				 * off.
-				 */
-				ifr.ifr_flags &= ~IFF_PROMISC;
-				if (ioctl(handle->fd, SIOCSIFFLAGS, &ifr) == -1) {
-					fprintf(stderr,
-					    "Can't restore interface flags (SIOCSIFFLAGS failed: %s).\n"
-					    "Please adjust manually.\n"
-					    "Hint: This can't happen with Linux >= 2.2.0.\n",
-					    strerror(errno));
-				}
-			}
-		}
-
-		/*
-		 * Take this pcap out of the list of pcaps for which we
-		 * have to take the interface out of promiscuous mode.
-		 */
-		for (p = pcaps_to_close, prevp = NULL; p != NULL;
-		    prevp = p, p = p->md.next) {
-			if (p == handle) {
-				/*
-				 * Found it.  Remove it from the list.
-				 */
-				if (prevp == NULL) {
-					/*
-					 * It was at the head of the list.
-					 */
-					pcaps_to_close = p->md.next;
-				} else {
-					/*
-					 * It was in the middle of the list.
-					 */
-					prevp->md.next = p->md.next;
-				}
-				break;
-			}
-		}
-	}
-
-	if (handle->md.device != NULL)
-		free(handle->md.device);
-	handle->md.device = NULL;
-	pcap_close_common(handle);
-}
-
-/*
- *  Try to open a packet socket using the old kernel interface.
- *  Returns 0 on failure.
- *  FIXME: 0 uses to mean success (Sebastian)
- */
-static int
-live_open_old(pcap_t *handle, const char *device, int promisc,
-	      int to_ms, char *ebuf)
-{
-	int		arptype;
-	struct ifreq	ifr;
-
-	do {
-		/* Open the socket */
-
-		handle->fd = socket(PF_INET, SOCK_PACKET, htons(ETH_P_ALL));
-		if (handle->fd == -1) {
-			snprintf(ebuf, PCAP_ERRBUF_SIZE,
-				 "socket: %s", pcap_strerror(errno));
-			break;
-		}
-
-		/* It worked - we are using the old interface */
-		handle->md.sock_packet = 1;
-
-		/* ...which means we get the link-layer header. */
-		handle->md.cooked = 0;
-
-		/* Bind to the given device */
-
-		if (!device) {
-		        strncpy(ebuf, "pcap_open_live: The \"any\" device isn't supported on 2.0[.x]-kernel systems",
-				PCAP_ERRBUF_SIZE);
-			break;
-		}
-		if (iface_bind_old(handle->fd, device, ebuf) == -1)
-			break;
-
-		/*
-		 * Try to get the link-layer type.
-		 */
-		arptype = iface_get_arptype(handle->fd, device, ebuf);
-		if (arptype == -1)
-			break;
-
-		/*
-		 * Try to find the DLT_ type corresponding to that
-		 * link-layer type.
-		 */
-		map_arphrd_to_dlt(handle, arptype, 0);
-		if (handle->linktype == -1) {
-			snprintf(ebuf, PCAP_ERRBUF_SIZE,
-				 "unknown arptype %d", arptype);
-			break;
-		}
-
-		/* Go to promisc mode if requested */
-
-		if (promisc) {
-			memset(&ifr, 0, sizeof(ifr));
-			strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
-			if (ioctl(handle->fd, SIOCGIFFLAGS, &ifr) == -1) {
-				snprintf(ebuf, PCAP_ERRBUF_SIZE,
-					 "SIOCGIFFLAGS: %s", pcap_strerror(errno));
-				break;
-			}
-			if ((ifr.ifr_flags & IFF_PROMISC) == 0) {
-				/*
-				 * Promiscuous mode isn't currently on,
-				 * so turn it on, and remember that
-				 * we should turn it off when the
-				 * pcap_t is closed.
-				 */
-
-				/*
-				 * 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; don't
-						 * put the interface in
-						 * promiscuous mode, just
-						 * give up.
-						 */
-						strncpy(ebuf, "atexit failed",
-							PCAP_ERRBUF_SIZE);
-						break;
-					}
-					did_atexit = 1;
-				}
-
-				ifr.ifr_flags |= IFF_PROMISC;
-				if (ioctl(handle->fd, SIOCSIFFLAGS, &ifr) == -1) {
-				        snprintf(ebuf, PCAP_ERRBUF_SIZE,
-						 "SIOCSIFFLAGS: %s",
-						 pcap_strerror(errno));
-					break;
-				}
-				handle->md.clear_promisc = 1;
-
-				/*
-				 * Add this to the list of pcaps
-				 * to close when we exit.
-				 */
-				handle->md.next = pcaps_to_close;
-				pcaps_to_close = handle;
-			}
-		}
-
-		/*
-		 * Default value for offset to align link-layer payload
-		 * on a 4-byte boundary.
-		 */
-		handle->offset	 = 0;
-
-		return 1;
-
-	} while (0);
-
-	pcap_close_linux(handle);
-	return 0;
-}
-
-/*
- *  Bind the socket associated with FD to the given device using the
- *  interface of the old kernels.
- */
-static int
-iface_bind_old(int fd, const char *device, char *ebuf)
-{
-	struct sockaddr	saddr;
-	int		err;
-	socklen_t	errlen = sizeof(err);
-
-	memset(&saddr, 0, sizeof(saddr));
-	strncpy(saddr.sa_data, device, sizeof(saddr.sa_data));
-	if (bind(fd, &saddr, sizeof(saddr)) == -1) {
-		snprintf(ebuf, PCAP_ERRBUF_SIZE,
-			 "bind: %s", pcap_strerror(errno));
-		return -1;
-	}
-
-	/* Any pending errors, e.g., network is down? */
-
-	if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &err, &errlen) == -1) {
-		snprintf(ebuf, PCAP_ERRBUF_SIZE,
-			"getsockopt: %s", pcap_strerror(errno));
-		return -1;
-	}
-
-	if (err > 0) {
-		snprintf(ebuf, PCAP_ERRBUF_SIZE,
-			"bind: %s", pcap_strerror(err));
-		return -1;
-	}
-
-	return 0;
-}
-
-
-/* ===== System calls available on all supported kernels ============== */
-
-/*
- *  Query the kernel for the MTU of the given interface.
- */
-static int
-iface_get_mtu(int fd, const char *device, char *ebuf)
-{
-	struct ifreq	ifr;
-
-	if (!device)
-		return BIGGER_THAN_ALL_MTUS;
-
-	memset(&ifr, 0, sizeof(ifr));
-	strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
-
-	if (ioctl(fd, SIOCGIFMTU, &ifr) == -1) {
-		snprintf(ebuf, PCAP_ERRBUF_SIZE,
-			 "SIOCGIFMTU: %s", pcap_strerror(errno));
-		return -1;
-	}
-
-	return ifr.ifr_mtu;
-}
-
-/*
- *  Get the hardware type of the given interface as ARPHRD_xxx constant.
- */
-static int
-iface_get_arptype(int fd, const char *device, char *ebuf)
-{
-	struct ifreq	ifr;
-
-	memset(&ifr, 0, sizeof(ifr));
-	strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
-
-	if (ioctl(fd, SIOCGIFHWADDR, &ifr) == -1) {
-		snprintf(ebuf, PCAP_ERRBUF_SIZE,
-			 "SIOCGIFHWADDR: %s", pcap_strerror(errno));
-		return -1;
-	}
-
-	return ifr.ifr_hwaddr.sa_family;
-}
-
-#ifdef SO_ATTACH_FILTER
-static int
-fix_program(pcap_t *handle, struct sock_fprog *fcode)
-{
-	size_t prog_size;
-	register int i;
-	register struct bpf_insn *p;
-	struct bpf_insn *f;
-	int len;
-
-	/*
-	 * Make a copy of the filter, and modify that copy if
-	 * necessary.
-	 */
-	prog_size = sizeof(*handle->fcode.bf_insns) * handle->fcode.bf_len;
-	len = handle->fcode.bf_len;
-	f = (struct bpf_insn *)malloc(prog_size);
-	if (f == NULL) {
-		snprintf(handle->errbuf, sizeof(handle->errbuf),
-			 "malloc: %s", pcap_strerror(errno));
-		return -1;
-	}
-	memcpy(f, handle->fcode.bf_insns, prog_size);
-	fcode->len = len;
-	fcode->filter = (struct sock_filter *) f;
-
-	for (i = 0; i < len; ++i) {
-		p = &f[i];
-		/*
-		 * What type of instruction is this?
-		 */
-		switch (BPF_CLASS(p->code)) {
-
-		case BPF_RET:
-			/*
-			 * It's a return instruction; is the snapshot
-			 * length a constant, rather than the contents
-			 * of the accumulator?
-			 */
-			if (BPF_MODE(p->code) == BPF_K) {
-				/*
-				 * Yes - if the value to be returned,
-				 * i.e. the snapshot length, is anything
-				 * other than 0, make it 65535, so that
-				 * the packet is truncated by "recvfrom()",
-				 * not by the filter.
-				 *
-				 * XXX - there's nothing we can easily do
-				 * if it's getting the value from the
-				 * accumulator; we'd have to insert
-				 * code to force non-zero values to be
-				 * 65535.
-				 */
-				if (p->k != 0)
-					p->k = 65535;
-			}
-			break;
-
-		case BPF_LD:
-		case BPF_LDX:
-			/*
-			 * It's a load instruction; is it loading
-			 * from the packet?
-			 */
-			switch (BPF_MODE(p->code)) {
-
-			case BPF_ABS:
-			case BPF_IND:
-			case BPF_MSH:
-				/*
-				 * Yes; are we in cooked mode?
-				 */
-				if (handle->md.cooked) {
-					/*
-					 * Yes, so we need to fix this
-					 * instruction.
-					 */
-					if (fix_offset(p) < 0) {
-						/*
-						 * We failed to do so.
-						 * Return 0, so our caller
-						 * knows to punt to userland.
-						 */
-						return 0;
-					}
-				}
-				break;
-			}
-			break;
-		}
-	}
-	return 1;	/* we succeeded */
-}
-
-static int
-fix_offset(struct bpf_insn *p)
-{
-	/*
-	 * What's the offset?
-	 */
-	if (p->k >= SLL_HDR_LEN) {
-		/*
-		 * It's within the link-layer payload; that starts at an
-		 * offset of 0, as far as the kernel packet filter is
-		 * concerned, so subtract the length of the link-layer
-		 * header.
-		 */
-		p->k -= SLL_HDR_LEN;
-	} else if (p->k == 14) {
-		/*
-		 * It's the protocol field; map it to the special magic
-		 * kernel offset for that field.
-		 */
-		p->k = SKF_AD_OFF + SKF_AD_PROTOCOL;
-	} else {
-		/*
-		 * It's within the header, but it's not one of those
-		 * fields; we can't do that in the kernel, so punt
-		 * to userland.
-		 */
-		return -1;
-	}
-	return 0;
-}
-
-static int
-set_kernel_filter(pcap_t *handle, struct sock_fprog *fcode)
-{
-	int total_filter_on = 0;
-	int save_mode;
-	int ret;
-	int save_errno;
-
-	/*
-	 * The socket filter code doesn't discard all packets queued
-	 * up on the socket when the filter is changed; this means
-	 * that packets that don't match the new filter may show up
-	 * after the new filter is put onto the socket, if those
-	 * packets haven't yet been read.
-	 *
-	 * This means, for example, that if you do a tcpdump capture
-	 * with a filter, the first few packets in the capture might
-	 * be packets that wouldn't have passed the filter.
-	 *
-	 * We therefore discard all packets queued up on the socket
-	 * when setting a kernel filter.  (This isn't an issue for
-	 * userland filters, as the userland filtering is done after
-	 * packets are queued up.)
-	 *
-	 * To flush those packets, we put the socket in read-only mode,
-	 * and read packets from the socket until there are no more to
-	 * read.
-	 *
-	 * In order to keep that from being an infinite loop - i.e.,
-	 * to keep more packets from arriving while we're draining
-	 * the queue - we put the "total filter", which is a filter
-	 * that rejects all packets, onto the socket before draining
-	 * the queue.
-	 *
-	 * This code deliberately ignores any errors, so that you may
-	 * get bogus packets if an error occurs, rather than having
-	 * the filtering done in userland even if it could have been
-	 * done in the kernel.
-	 */
-	if (setsockopt(handle->fd, SOL_SOCKET, SO_ATTACH_FILTER,
-		       &total_fcode, sizeof(total_fcode)) == 0) {
-		char drain[1];
-
-		/*
-		 * Note that we've put the total filter onto the socket.
-		 */
-		total_filter_on = 1;
-
-		/*
-		 * Save the socket's current mode, and put it in
-		 * non-blocking mode; we drain it by reading packets
-		 * until we get an error (which is normally a
-		 * "nothing more to be read" error).
-		 */
-		save_mode = fcntl(handle->fd, F_GETFL, 0);
-		if (save_mode != -1 &&
-		    fcntl(handle->fd, F_SETFL, save_mode | O_NONBLOCK) >= 0) {
-			while (recv(handle->fd, &drain, sizeof drain,
-			       MSG_TRUNC) >= 0)
-				;
-			save_errno = errno;
-			fcntl(handle->fd, F_SETFL, save_mode);
-			if (save_errno != EAGAIN) {
-				/* Fatal error */
-				reset_kernel_filter(handle);
-				snprintf(handle->errbuf, sizeof(handle->errbuf),
-				 "recv: %s", pcap_strerror(save_errno));
-				return -2;
-			}
-		}
-	}
-
-	/*
-	 * Now attach the new filter.
-	 */
-	ret = setsockopt(handle->fd, SOL_SOCKET, SO_ATTACH_FILTER,
-			 fcode, sizeof(*fcode));
-	if (ret == -1 && total_filter_on) {
-		/*
-		 * Well, we couldn't set that filter on the socket,
-		 * but we could set the total filter on the socket.
-		 *
-		 * This could, for example, mean that the filter was
-		 * too big to put into the kernel, so we'll have to
-		 * filter in userland; in any case, we'll be doing
-		 * filtering in userland, so we need to remove the
-		 * total filter so we see packets.
-		 */
-		save_errno = errno;
-
-		/*
-		 * XXX - if this fails, we're really screwed;
-		 * we have the total filter on the socket,
-		 * and it won't come off.  What do we do then?
-		 */
-		reset_kernel_filter(handle);
-
-		errno = save_errno;
-	}
-	return ret;
-}
-
-static int
-reset_kernel_filter(pcap_t *handle)
-{
-	/*
-	 * setsockopt() barfs unless it get a dummy parameter.
-	 * valgrind whines unless the value is initialized,
-	 * as it has no idea that setsockopt() ignores its
-	 * parameter.
-	 */
-	int dummy = 0;
-
-	return setsockopt(handle->fd, SOL_SOCKET, SO_DETACH_FILTER,
-				   &dummy, sizeof(dummy));
-}
-#endif