testprogs/valgrindtest.c - platform/external/libpcap - Git at Google

 /*
  * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
  *	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: (1) source code distributions
  * retain the above copyright notice and this paragraph in its entirety, (2)
  * distributions including binary code include the above copyright notice and
  * this paragraph in its entirety in the documentation or other materials
  * provided with the distribution, and (3) all advertising materials mentioning
  * features or use of this software display the following acknowledgement:
  * ``This product includes software developed by the University of California,
  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  * the University nor the names of its contributors may 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.
  */

 #include "varattrs.h"

 /*
  * This doesn't actually test libpcap itself; it tests whether
  * valgrind properly handles the APIs libpcap uses.  If it doesn't,
  * we end up getting patches submitted to "fix" references that
  * valgrind claims are being made to uninitialized data, when, in
  * fact, the OS isn't making any such references - or we get
  * valgrind *not* detecting *actual* incorrect references.
  *
  * Both BPF and Linux socket filters aren't handled correctly
  * by some versions of valgrind.  See valgrind bug 318203 for
  * Linux:
  *
  *	https://bugs.kde.org/show_bug.cgi?id=318203
  *
  * and valgrind bug 312989 for macOS:
  *
  *	https://bugs.kde.org/show_bug.cgi?id=312989
  *
  * The fixes for both of those are checked into the official valgrind
  * repository.
  *
  * The unofficial FreeBSD port has similar issues to the official macOS
  * port, for similar reasons.
  */
 #ifndef lint
 static const char copyright[] _U_ =
     "@(#) Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000\n\
 The Regents of the University of California.  All rights reserved.\n";
 #endif

 #ifdef HAVE_CONFIG_H
 #include <config.h>
 #endif

 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <stdarg.h>
 #include <unistd.h>
 #include <fcntl.h>
 #include <errno.h>
 #include <arpa/inet.h>
 #include <sys/types.h>
 #include <sys/stat.h>

 #include "pcap/funcattrs.h"

 #if defined(__APPLE__) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__) || defined(_AIX) || defined(sun)
 /* OS with BPF - use BPF */
 #define USE_BPF
 #elif defined(linux)
 /* Linux - use socket filters */
 #define USE_SOCKET_FILTERS
 #else
 #error "Unknown platform or platform that doesn't support Valgrind"
 #endif

 #if defined(USE_BPF)

 #include <sys/ioctl.h>
 #include <net/bpf.h>

 /*
  * Make "pcap.h" not include "pcap/bpf.h"; we are going to include the
  * native OS version, as we're going to be doing our own ioctls to
  * make sure that, in the uninitialized-data tests, the filters aren't
  * checked by libpcap before being handed to BPF.
  */
 #define PCAP_DONT_INCLUDE_PCAP_BPF_H

 #elif defined(USE_SOCKET_FILTERS)

 #include <sys/socket.h>
 #include <linux/types.h>
 #include <linux/filter.h>

 #endif

 #include <pcap.h>

 static char *program_name;

 /* Forwards */
 static void PCAP_NORETURN usage(void);
 static void PCAP_NORETURN error(const char *, ...) PCAP_PRINTFLIKE(1, 2);
 static void warning(const char *, ...) PCAP_PRINTFLIKE(1, 2);

 /*
  * On Windows, we need to open the file in binary mode, so that
  * we get all the bytes specified by the size we get from "fstat()".
  * On UNIX, that's not necessary.  O_BINARY is defined on Windows;
  * we define it as 0 if it's not defined, so it does nothing.
  */
 #ifndef O_BINARY
 #define O_BINARY	0
 #endif

 static char *
 read_infile(char *fname)
 {
 	register int i, fd, cc;
 	register char *cp;
 	struct stat buf;

 	fd = open(fname, O_RDONLY|O_BINARY);
 	if (fd < 0)
 		error("can't open %s: %s", fname, pcap_strerror(errno));

 	if (fstat(fd, &buf) < 0)
 		error("can't stat %s: %s", fname, pcap_strerror(errno));

 	cp = malloc((u_int)buf.st_size + 1);
 	if (cp == NULL)
 		error("malloc(%d) for %s: %s", (u_int)buf.st_size + 1,
 			fname, pcap_strerror(errno));
 	cc = read(fd, cp, (u_int)buf.st_size);
 	if (cc < 0)
 		error("read %s: %s", fname, pcap_strerror(errno));
 	if (cc != buf.st_size)
 		error("short read %s (%d != %d)", fname, cc, (int)buf.st_size);

 	close(fd);
 	/* replace "# comment" with spaces */
 	for (i = 0; i < cc; i++) {
 		if (cp[i] == '#')
 			while (i < cc && cp[i] != '\n')
 				cp[i++] = ' ';
 	}
 	cp[cc] = '\0';
 	return (cp);
 }

 /* VARARGS */
 static void
 error(const char *fmt, ...)
 {
 	va_list ap;

 	(void)fprintf(stderr, "%s: ", program_name);
 	va_start(ap, fmt);
 	(void)vfprintf(stderr, fmt, ap);
 	va_end(ap);
 	if (*fmt) {
 		fmt += strlen(fmt);
 		if (fmt[-1] != '\n')
 			(void)fputc('\n', stderr);
 	}
 	exit(1);
 	/* NOTREACHED */
 }

 /* VARARGS */
 static void
 warning(const char *fmt, ...)
 {
 	va_list ap;

 	(void)fprintf(stderr, "%s: WARNING: ", program_name);
 	va_start(ap, fmt);
 	(void)vfprintf(stderr, fmt, ap);
 	va_end(ap);
 	if (*fmt) {
 		fmt += strlen(fmt);
 		if (fmt[-1] != '\n')
 			(void)fputc('\n', stderr);
 	}
 }

 /*
  * Copy arg vector into a new buffer, concatenating arguments with spaces.
  */
 static char *
 copy_argv(register char **argv)
 {
 	register char **p;
 	register u_int len = 0;
 	char *buf;
 	char *src, *dst;

 	p = argv;
 	if (*p == 0)
 		return 0;

 	while (*p)
 		len += strlen(*p++) + 1;

 	buf = (char *)malloc(len);
 	if (buf == NULL)
 		error("copy_argv: malloc");

 	p = argv;
 	dst = buf;
 	while ((src = *p++) != NULL) {
 		while ((*dst++ = *src++) != '\0')
 			;
 		dst[-1] = ' ';
 	}
 	dst[-1] = '\0';

 	return buf;
 }

 #define INSN_COUNT	17

 int
 main(int argc, char **argv)
 {
 	char *cp, *device;
 	int op;
 	int dorfmon, useactivate;
 	char ebuf[PCAP_ERRBUF_SIZE];
 	char *infile;
 	const char *cmdbuf;
 	pcap_if_t *devlist;
 	pcap_t *pd;
 	int status = 0;
 	int pcap_fd;
 #if defined(USE_BPF)
 	struct bpf_program bad_fcode;
 	struct bpf_insn uninitialized[INSN_COUNT];
 #elif defined(USE_SOCKET_FILTERS)
 	struct sock_fprog bad_fcode;
 	struct sock_filter uninitialized[INSN_COUNT];
 #endif
 	struct bpf_program fcode;

 	device = NULL;
 	dorfmon = 0;
 	useactivate = 0;
 	infile = NULL;

 	if ((cp = strrchr(argv[0], '/')) != NULL)
 		program_name = cp + 1;
 	else
 		program_name = argv[0];

 	opterr = 0;
 	while ((op = getopt(argc, argv, "aF:i:I")) != -1) {
 		switch (op) {

 		case 'a':
 			useactivate = 1;
 			break;

 		case 'F':
 			infile = optarg;
 			break;

 		case 'i':
 			device = optarg;
 			break;

 		case 'I':
 			dorfmon = 1;
 			useactivate = 1;	/* required for rfmon */
 			break;

 		default:
 			usage();
 			/* NOTREACHED */
 		}
 	}

 	if (device == NULL) {
 		/*
 		 * No interface specified; get whatever pcap_lookupdev()
 		 * finds.
 		 */
 		if (pcap_findalldevs(&devlist, ebuf) == -1)
 			error("%s", ebuf);
 		if (devlist == NULL)
 			error("no interfaces available for capture");
 		device = strdup(devlist->name);
 		pcap_freealldevs(devlist);
 	}

 	if (infile != NULL) {
 		/*
 		 * Filter specified with "-F" and a file containing
 		 * a filter.
 		 */
 		cmdbuf = read_infile(infile);
 	} else {
 		if (optind < argc) {
 			/*
 			 * Filter specified with arguments on the
 			 * command line.
 			 */
 			cmdbuf = copy_argv(&argv[optind+1]);
 		} else {
 			/*
 			 * No filter specified; use an empty string, which
 			 * compiles to an "accept all" filter.
 			 */
 			cmdbuf = "";
 		}
 	}

 	if (useactivate) {
 		pd = pcap_create(device, ebuf);
 		if (pd == NULL)
 			error("%s: pcap_create() failed: %s", device, ebuf);
 		status = pcap_set_snaplen(pd, 65535);
 		if (status != 0)
 			error("%s: pcap_set_snaplen failed: %s",
 			    device, pcap_statustostr(status));
 		status = pcap_set_promisc(pd, 1);
 		if (status != 0)
 			error("%s: pcap_set_promisc failed: %s",
 			    device, pcap_statustostr(status));
 		if (dorfmon) {
 			status = pcap_set_rfmon(pd, 1);
 			if (status != 0)
 				error("%s: pcap_set_rfmon failed: %s",
 				    device, pcap_statustostr(status));
 		}
 		status = pcap_set_timeout(pd, 1000);
 		if (status != 0)
 			error("%s: pcap_set_timeout failed: %s",
 			    device, pcap_statustostr(status));
 		status = pcap_activate(pd);
 		if (status < 0) {
 			/*
 			 * pcap_activate() failed.
 			 */
 			error("%s: %s\n(%s)", device,
 			    pcap_statustostr(status), pcap_geterr(pd));
 		} else if (status > 0) {
 			/*
 			 * pcap_activate() succeeded, but it's warning us
 			 * of a problem it had.
 			 */
 			warning("%s: %s\n(%s)", device,
 			    pcap_statustostr(status), pcap_geterr(pd));
 		}
 	} else {
 		*ebuf = '\0';
 		pd = pcap_open_live(device, 65535, 1, 1000, ebuf);
 		if (pd == NULL)
 			error("%s", ebuf);
 		else if (*ebuf)
 			warning("%s", ebuf);
 	}

 	pcap_fd = pcap_fileno(pd);

 	/*
 	 * Try setting a filter with an uninitialized bpf_program
 	 * structure.  This should cause valgrind to report a
 	 * problem.
 	 *
 	 * We don't check for errors, because it could get an
 	 * error due to a bad pointer or count.
 	 */
 #if defined(USE_BPF)
 	ioctl(pcap_fd, BIOCSETF, &bad_fcode);
 #elif defined(USE_SOCKET_FILTERS)
 	setsockopt(pcap_fd, SOL_SOCKET, SO_ATTACH_FILTER, &bad_fcode,
 	    sizeof(bad_fcode));
 #endif

 	/*
 	 * Try setting a filter with an initialized bpf_program
 	 * structure that points to an uninitialized program.
 	 * That should also cause valgrind to report a problem.
 	 *
 	 * We don't check for errors, because it could get an
 	 * error due to a bad pointer or count.
 	 */
 #if defined(USE_BPF)
 	bad_fcode.bf_len = INSN_COUNT;
 	bad_fcode.bf_insns = uninitialized;
 	ioctl(pcap_fd, BIOCSETF, &bad_fcode);
 #elif defined(USE_SOCKET_FILTERS)
 	bad_fcode.len = INSN_COUNT;
 	bad_fcode.filter = uninitialized;
 	setsockopt(pcap_fd, SOL_SOCKET, SO_ATTACH_FILTER, &bad_fcode,
 	    sizeof(bad_fcode));
 #endif

 	/*
 	 * Now compile a filter and set the filter with that.
 	 * That should *not* cause valgrind to report a
 	 * problem.
 	 */
 	if (pcap_compile(pd, &fcode, cmdbuf, 1, 0) < 0)
 		error("can't compile filter: %s", pcap_geterr(pd));
 	if (pcap_setfilter(pd, &fcode) < 0)
 		error("can't set filter: %s", pcap_geterr(pd));

 	pcap_close(pd);
 	exit(status < 0 ? 1 : 0);
 }

 static void
 usage(void)
 {
 	(void)fprintf(stderr, "%s, with %s\n", program_name,
 	    pcap_lib_version());
 	(void)fprintf(stderr,
 	    "Usage: %s [-aI] [ -F file ] [ -I interface ] [ expression ]\n",
 	    program_name);
 	exit(1);
 }
	/*
	* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
	* 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: (1) source code distributions
	* retain the above copyright notice and this paragraph in its entirety, (2)
	* distributions including binary code include the above copyright notice and
	* this paragraph in its entirety in the documentation or other materials
	* provided with the distribution, and (3) all advertising materials mentioning
	* features or use of this software display the following acknowledgement:
	* ``This product includes software developed by the University of California,
	* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
	* the University nor the names of its contributors may 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.
	*/

	#include "varattrs.h"

	/*
	* This doesn't actually test libpcap itself; it tests whether
	* valgrind properly handles the APIs libpcap uses. If it doesn't,
	* we end up getting patches submitted to "fix" references that
	* valgrind claims are being made to uninitialized data, when, in
	* fact, the OS isn't making any such references - or we get
	* valgrind not detecting actual incorrect references.
	*
	* Both BPF and Linux socket filters aren't handled correctly
	* by some versions of valgrind. See valgrind bug 318203 for
	* Linux:
	*
	* https://bugs.kde.org/show_bug.cgi?id=318203
	*
	* and valgrind bug 312989 for macOS:
	*
	* https://bugs.kde.org/show_bug.cgi?id=312989
	*
	* The fixes for both of those are checked into the official valgrind
	* repository.
	*
	* The unofficial FreeBSD port has similar issues to the official macOS
	* port, for similar reasons.
	*/
	#ifndef lint
	static const char copyright[] _U_ =
	"@(#) Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000\n\
	The Regents of the University of California. All rights reserved.\n";
	#endif

	#ifdef HAVE_CONFIG_H
	#include <config.h>
	#endif

	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <stdarg.h>
	#include <unistd.h>
	#include <fcntl.h>
	#include <errno.h>
	#include <arpa/inet.h>
	#include <sys/types.h>
	#include <sys/stat.h>

	#include "pcap/funcattrs.h"

	#if defined(__APPLE__) \|\| defined(__FreeBSD__) \|\| defined(__NetBSD__) \|\| defined(__OpenBSD__) \|\| defined(__DragonFly__) \|\| defined(_AIX) \|\| defined(sun)
	/* OS with BPF - use BPF */
	#define USE_BPF
	#elif defined(linux)
	/* Linux - use socket filters */
	#define USE_SOCKET_FILTERS
	#else
	#error "Unknown platform or platform that doesn't support Valgrind"
	#endif

	#if defined(USE_BPF)

	#include <sys/ioctl.h>
	#include <net/bpf.h>

	/*
	* Make "pcap.h" not include "pcap/bpf.h"; we are going to include the
	* native OS version, as we're going to be doing our own ioctls to
	* make sure that, in the uninitialized-data tests, the filters aren't
	* checked by libpcap before being handed to BPF.
	*/
	#define PCAP_DONT_INCLUDE_PCAP_BPF_H

	#elif defined(USE_SOCKET_FILTERS)

	#include <sys/socket.h>
	#include <linux/types.h>
	#include <linux/filter.h>

	#endif

	#include <pcap.h>

	static char *program_name;

	/* Forwards */
	static void PCAP_NORETURN usage(void);
	static void PCAP_NORETURN error(const char *, ...) PCAP_PRINTFLIKE(1, 2);
	static void warning(const char *, ...) PCAP_PRINTFLIKE(1, 2);

	/*
	* On Windows, we need to open the file in binary mode, so that
	* we get all the bytes specified by the size we get from "fstat()".
	* On UNIX, that's not necessary. O_BINARY is defined on Windows;
	* we define it as 0 if it's not defined, so it does nothing.
	*/
	#ifndef O_BINARY
	#define O_BINARY 0
	#endif

	static char *
	read_infile(char *fname)
	{
	register int i, fd, cc;
	register char *cp;
	struct stat buf;

	fd = open(fname, O_RDONLY\|O_BINARY);
	if (fd < 0)
	error("can't open %s: %s", fname, pcap_strerror(errno));

	if (fstat(fd, &buf) < 0)
	error("can't stat %s: %s", fname, pcap_strerror(errno));

	cp = malloc((u_int)buf.st_size + 1);
	if (cp == NULL)
	error("malloc(%d) for %s: %s", (u_int)buf.st_size + 1,
	fname, pcap_strerror(errno));
	cc = read(fd, cp, (u_int)buf.st_size);
	if (cc < 0)
	error("read %s: %s", fname, pcap_strerror(errno));
	if (cc != buf.st_size)
	error("short read %s (%d != %d)", fname, cc, (int)buf.st_size);

	close(fd);
	/* replace "# comment" with spaces */
	for (i = 0; i < cc; i++) {
	if (cp[i] == '#')
	while (i < cc && cp[i] != '\n')
	cp[i++] = ' ';
	}
	cp[cc] = '\0';
	return (cp);
	}

	/* VARARGS */
	static void
	error(const char *fmt, ...)
	{
	va_list ap;

	(void)fprintf(stderr, "%s: ", program_name);
	va_start(ap, fmt);
	(void)vfprintf(stderr, fmt, ap);
	va_end(ap);
	if (*fmt) {
	fmt += strlen(fmt);
	if (fmt[-1] != '\n')
	(void)fputc('\n', stderr);
	}
	exit(1);
	/* NOTREACHED */
	}

	/* VARARGS */
	static void
	warning(const char *fmt, ...)
	{
	va_list ap;

	(void)fprintf(stderr, "%s: WARNING: ", program_name);
	va_start(ap, fmt);
	(void)vfprintf(stderr, fmt, ap);
	va_end(ap);
	if (*fmt) {
	fmt += strlen(fmt);
	if (fmt[-1] != '\n')
	(void)fputc('\n', stderr);
	}
	}

	/*
	* Copy arg vector into a new buffer, concatenating arguments with spaces.
	*/
	static char *
	copy_argv(register char **argv)
	{
	register char **p;
	register u_int len = 0;
	char *buf;
	char src, dst;

	p = argv;
	if (*p == 0)
	return 0;

	while (*p)
	len += strlen(*p++) + 1;

	buf = (char *)malloc(len);
	if (buf == NULL)
	error("copy_argv: malloc");

	p = argv;
	dst = buf;
	while ((src = *p++) != NULL) {
	while ((dst++ = src++) != '\0')
	;
	dst[-1] = ' ';
	}
	dst[-1] = '\0';

	return buf;
	}

	#define INSN_COUNT 17

	int
	main(int argc, char **argv)
	{
	char cp, device;
	int op;
	int dorfmon, useactivate;
	char ebuf[PCAP_ERRBUF_SIZE];
	char *infile;
	const char *cmdbuf;
	pcap_if_t *devlist;
	pcap_t *pd;
	int status = 0;
	int pcap_fd;
	#if defined(USE_BPF)
	struct bpf_program bad_fcode;
	struct bpf_insn uninitialized[INSN_COUNT];
	#elif defined(USE_SOCKET_FILTERS)
	struct sock_fprog bad_fcode;
	struct sock_filter uninitialized[INSN_COUNT];
	#endif
	struct bpf_program fcode;

	device = NULL;
	dorfmon = 0;
	useactivate = 0;
	infile = NULL;

	if ((cp = strrchr(argv[0], '/')) != NULL)
	program_name = cp + 1;
	else
	program_name = argv[0];

	opterr = 0;
	while ((op = getopt(argc, argv, "aF:i:I")) != -1) {
	switch (op) {

	case 'a':
	useactivate = 1;
	break;

	case 'F':
	infile = optarg;
	break;

	case 'i':
	device = optarg;
	break;

	case 'I':
	dorfmon = 1;
	useactivate = 1; /* required for rfmon */
	break;

	default:
	usage();
	/* NOTREACHED */
	}
	}

	if (device == NULL) {
	/*
	* No interface specified; get whatever pcap_lookupdev()
	* finds.
	*/
	if (pcap_findalldevs(&devlist, ebuf) == -1)
	error("%s", ebuf);
	if (devlist == NULL)
	error("no interfaces available for capture");
	device = strdup(devlist->name);
	pcap_freealldevs(devlist);
	}

	if (infile != NULL) {
	/*
	* Filter specified with "-F" and a file containing
	* a filter.
	*/
	cmdbuf = read_infile(infile);
	} else {
	if (optind < argc) {
	/*
	* Filter specified with arguments on the
	* command line.
	*/
	cmdbuf = copy_argv(&argv[optind+1]);
	} else {
	/*
	* No filter specified; use an empty string, which
	* compiles to an "accept all" filter.
	*/
	cmdbuf = "";
	}
	}

	if (useactivate) {
	pd = pcap_create(device, ebuf);
	if (pd == NULL)
	error("%s: pcap_create() failed: %s", device, ebuf);
	status = pcap_set_snaplen(pd, 65535);
	if (status != 0)
	error("%s: pcap_set_snaplen failed: %s",
	device, pcap_statustostr(status));
	status = pcap_set_promisc(pd, 1);
	if (status != 0)
	error("%s: pcap_set_promisc failed: %s",
	device, pcap_statustostr(status));
	if (dorfmon) {
	status = pcap_set_rfmon(pd, 1);
	if (status != 0)
	error("%s: pcap_set_rfmon failed: %s",
	device, pcap_statustostr(status));
	}
	status = pcap_set_timeout(pd, 1000);
	if (status != 0)
	error("%s: pcap_set_timeout failed: %s",
	device, pcap_statustostr(status));
	status = pcap_activate(pd);
	if (status < 0) {
	/*
	* pcap_activate() failed.
	*/
	error("%s: %s\n(%s)", device,
	pcap_statustostr(status), pcap_geterr(pd));
	} else if (status > 0) {
	/*
	* pcap_activate() succeeded, but it's warning us
	* of a problem it had.
	*/
	warning("%s: %s\n(%s)", device,
	pcap_statustostr(status), pcap_geterr(pd));
	}
	} else {
	*ebuf = '\0';
	pd = pcap_open_live(device, 65535, 1, 1000, ebuf);
	if (pd == NULL)
	error("%s", ebuf);
	else if (*ebuf)
	warning("%s", ebuf);
	}

	pcap_fd = pcap_fileno(pd);

	/*
	* Try setting a filter with an uninitialized bpf_program
	* structure. This should cause valgrind to report a
	* problem.
	*
	* We don't check for errors, because it could get an
	* error due to a bad pointer or count.
	*/
	#if defined(USE_BPF)
	ioctl(pcap_fd, BIOCSETF, &bad_fcode);
	#elif defined(USE_SOCKET_FILTERS)
	setsockopt(pcap_fd, SOL_SOCKET, SO_ATTACH_FILTER, &bad_fcode,
	sizeof(bad_fcode));
	#endif

	/*
	* Try setting a filter with an initialized bpf_program
	* structure that points to an uninitialized program.
	* That should also cause valgrind to report a problem.
	*
	* We don't check for errors, because it could get an
	* error due to a bad pointer or count.
	*/
	#if defined(USE_BPF)
	bad_fcode.bf_len = INSN_COUNT;
	bad_fcode.bf_insns = uninitialized;
	ioctl(pcap_fd, BIOCSETF, &bad_fcode);
	#elif defined(USE_SOCKET_FILTERS)
	bad_fcode.len = INSN_COUNT;
	bad_fcode.filter = uninitialized;
	setsockopt(pcap_fd, SOL_SOCKET, SO_ATTACH_FILTER, &bad_fcode,
	sizeof(bad_fcode));
	#endif

	/*
	* Now compile a filter and set the filter with that.
	* That should not cause valgrind to report a
	* problem.
	*/
	if (pcap_compile(pd, &fcode, cmdbuf, 1, 0) < 0)
	error("can't compile filter: %s", pcap_geterr(pd));
	if (pcap_setfilter(pd, &fcode) < 0)
	error("can't set filter: %s", pcap_geterr(pd));

	pcap_close(pd);
	exit(status < 0 ? 1 : 0);
	}

	static void
	usage(void)
	{
	(void)fprintf(stderr, "%s, with %s\n", program_name,
	pcap_lib_version());
	(void)fprintf(stderr,
	"Usage: %s [-aI] [ -F file ] [ -I interface ] [ expression ]\n",
	program_name);
	exit(1);
	}