tests/capturetest.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.
  */

 #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

 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <stdarg.h>
 #include <limits.h>
 #ifdef _WIN32
 #include "getopt.h"
 #else
 #include <unistd.h>
 #endif
 #include <errno.h>
 #include <sys/types.h>

 #include <pcap.h>

 static char *program_name;

 /*
  * This was introduced by Clang:
  *
  *     http://clang.llvm.org/docs/LanguageExtensions.html#has-attribute
  *
  * in some version (which version?); it has been picked up by GCC 5.0.
  */
 #ifndef __has_attribute
   /*
    * It's a macro, so you can check whether it's defined to check
    * whether it's supported.
    *
    * If it's not, define it to always return 0, so that we move on to
    * the fallback checks.
    */
   #define __has_attribute(x) 0
 #endif

 #if __has_attribute(noreturn) \
     || (defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 205)) \
     || (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590)) \
     || (defined(__xlC__) && __xlC__ >= 0x0A01) \
     || (defined(__HP_aCC) && __HP_aCC >= 61000)
   /*
    * Compiler with support for it, or GCC 2.5 and later, or Solaris Studio 12
    * (Sun C 5.9) and later, or IBM XL C 10.1 and later (do any earlier
    * versions of XL C support this?), or HP aCC A.06.10 and later.
    */
   #define PCAP_NORETURN __attribute((noreturn))
 #elif defined( _MSC_VER )
   #define PCAP_NORETURN __declspec(noreturn)
 #else
   #define PCAP_NORETURN
 #endif

 #if __has_attribute(__format__) \
     || (defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 203)) \
     || (defined(__xlC__) && __xlC__ >= 0x0A01) \
     || (defined(__HP_aCC) && __HP_aCC >= 61000)
   /*
    * Compiler with support for it, or GCC 2.3 and later, or IBM XL C 10.1
    * and later (do any earlier versions of XL C support this?),
    * or HP aCC A.06.10 and later.
    */
   #define PCAP_PRINTFLIKE(x,y) __attribute__((__format__(__printf__,x,y)))
 #else
   #define PCAP_PRINTFLIKE(x,y)
 #endif

 /* Forwards */
 static void countme(u_char *, const struct pcap_pkthdr *, const u_char *);
 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);
 static char *copy_argv(char **);

 static pcap_t *pd;

 int
 main(int argc, char **argv)
 {
 	register int op;
 	register char *cp, *cmdbuf, *device;
 	long longarg;
 	char *p;
 	int timeout = 1000;
 	int immediate = 0;
 	int nonblock = 0;
 	bpf_u_int32 localnet, netmask;
 	struct bpf_program fcode;
 	char ebuf[PCAP_ERRBUF_SIZE];
 	int status;
 	int packet_count;

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

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

 		case 'i':
 			device = optarg;
 			break;

 		case 'm':
 			immediate = 1;
 			break;

 		case 'n':
 			nonblock = 1;
 			break;

 		case 't':
 			longarg = strtol(optarg, &p, 10);
 			if (p == optarg || *p != '\0') {
 				error("Timeout value \"%s\" is not a number",
 				    optarg);
 				/* NOTREACHED */
 			}
 			if (longarg < 0) {
 				error("Timeout value %ld is negative", longarg);
 				/* NOTREACHED */
 			}
 			if (longarg > INT_MAX) {
 				error("Timeout value %ld is too large (> %d)",
 				    longarg, INT_MAX);
 				/* NOTREACHED */
 			}
 			timeout = (int)longarg;
 			break;

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

 	if (device == NULL) {
 		device = pcap_lookupdev(ebuf);
 		if (device == NULL)
 			error("%s", ebuf);
 	}
 	*ebuf = '\0';
 	pd = pcap_create(device, ebuf);
 	if (pd == NULL)
 		error("%s", ebuf);
 	status = pcap_set_snaplen(pd, 65535);
 	if (status != 0)
 		error("%s: pcap_set_snaplen failed: %s",
 			    device, pcap_statustostr(status));
 	if (immediate) {
 		status = pcap_set_immediate_mode(pd, 1);
 		if (status != 0)
 			error("%s: pcap_set_immediate_mode failed: %s",
 			    device, pcap_statustostr(status));
 	}
 	status = pcap_set_timeout(pd, timeout);
 	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));
 	}
 	if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
 		localnet = 0;
 		netmask = 0;
 		warning("%s", ebuf);
 	}
 	cmdbuf = copy_argv(&argv[optind]);

 	if (pcap_compile(pd, &fcode, cmdbuf, 1, netmask) < 0)
 		error("%s", pcap_geterr(pd));

 	if (pcap_setfilter(pd, &fcode) < 0)
 		error("%s", pcap_geterr(pd));
 	if (pcap_setnonblock(pd, nonblock, ebuf) == -1)
 		error("pcap_setnonblock failed: %s", ebuf);
 	printf("Listening on %s\n", device);
 	for (;;) {
 		packet_count = 0;
 		status = pcap_dispatch(pd, -1, countme,
 		    (u_char *)&packet_count);
 		if (status < 0)
 			break;
 		if (status != 0) {
 			printf("%d packets seen, %d packets counted after pcap_dispatch returns\n",
 			    status, packet_count);
 		}
 	}
 	if (status == -2) {
 		/*
 		 * We got interrupted, so perhaps we didn't
 		 * manage to finish a line we were printing.
 		 * Print an extra newline, just in case.
 		 */
 		putchar('\n');
 	}
 	(void)fflush(stdout);
 	if (status == -1) {
 		/*
 		 * Error.  Report it.
 		 */
 		(void)fprintf(stderr, "%s: pcap_loop: %s\n",
 		    program_name, pcap_geterr(pd));
 	}
 	pcap_close(pd);
 	exit(status == -1 ? 1 : 0);
 }

 static void
 countme(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
 {
 	int *counterp = (int *)user;

 	(*counterp)++;
 }

 static void
 usage(void)
 {
 	(void)fprintf(stderr, "Usage: %s [ -mn ] [ -i interface ] [ -t timeout] [expression]\n",
 	    program_name);
 	exit(1);
 }

 /* 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;
 }
	/*
	* 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.
	*/

	#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

	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <stdarg.h>
	#include <limits.h>
	#ifdef _WIN32
	#include "getopt.h"
	#else
	#include <unistd.h>
	#endif
	#include <errno.h>
	#include <sys/types.h>

	#include <pcap.h>

	static char *program_name;

	/*
	* This was introduced by Clang:
	*
	* http://clang.llvm.org/docs/LanguageExtensions.html#has-attribute
	*
	* in some version (which version?); it has been picked up by GCC 5.0.
	*/
	#ifndef __has_attribute
	/*
	* It's a macro, so you can check whether it's defined to check
	* whether it's supported.
	*
	* If it's not, define it to always return 0, so that we move on to
	* the fallback checks.
	*/
	#define __has_attribute(x) 0
	#endif

	#if __has_attribute(noreturn) \
	\|\| (defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 205)) \
	\|\| (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590)) \
	\|\| (defined(__xlC__) && __xlC__ >= 0x0A01) \
	\|\| (defined(__HP_aCC) && __HP_aCC >= 61000)
	/*
	* Compiler with support for it, or GCC 2.5 and later, or Solaris Studio 12
	* (Sun C 5.9) and later, or IBM XL C 10.1 and later (do any earlier
	* versions of XL C support this?), or HP aCC A.06.10 and later.
	*/
	#define PCAP_NORETURN __attribute((noreturn))
	#elif defined( _MSC_VER )
	#define PCAP_NORETURN __declspec(noreturn)
	#else
	#define PCAP_NORETURN
	#endif

	#if __has_attribute(__format__) \
	\|\| (defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 203)) \
	\|\| (defined(__xlC__) && __xlC__ >= 0x0A01) \
	\|\| (defined(__HP_aCC) && __HP_aCC >= 61000)
	/*
	* Compiler with support for it, or GCC 2.3 and later, or IBM XL C 10.1
	* and later (do any earlier versions of XL C support this?),
	* or HP aCC A.06.10 and later.
	*/
	#define PCAP_PRINTFLIKE(x,y) __attribute__((__format__(__printf__,x,y)))
	#else
	#define PCAP_PRINTFLIKE(x,y)
	#endif

	/* Forwards */
	static void countme(u_char , const struct pcap_pkthdr , const u_char *);
	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);
	static char copy_argv(char *);

	static pcap_t *pd;

	int
	main(int argc, char **argv)
	{
	register int op;
	register char cp, cmdbuf, *device;
	long longarg;
	char *p;
	int timeout = 1000;
	int immediate = 0;
	int nonblock = 0;
	bpf_u_int32 localnet, netmask;
	struct bpf_program fcode;
	char ebuf[PCAP_ERRBUF_SIZE];
	int status;
	int packet_count;

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

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

	case 'i':
	device = optarg;
	break;

	case 'm':
	immediate = 1;
	break;

	case 'n':
	nonblock = 1;
	break;

	case 't':
	longarg = strtol(optarg, &p, 10);
	if (p == optarg \|\| *p != '\0') {
	error("Timeout value \"%s\" is not a number",
	optarg);
	/* NOTREACHED */
	}
	if (longarg < 0) {
	error("Timeout value %ld is negative", longarg);
	/* NOTREACHED */
	}
	if (longarg > INT_MAX) {
	error("Timeout value %ld is too large (> %d)",
	longarg, INT_MAX);
	/* NOTREACHED */
	}
	timeout = (int)longarg;
	break;

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

	if (device == NULL) {
	device = pcap_lookupdev(ebuf);
	if (device == NULL)
	error("%s", ebuf);
	}
	*ebuf = '\0';
	pd = pcap_create(device, ebuf);
	if (pd == NULL)
	error("%s", ebuf);
	status = pcap_set_snaplen(pd, 65535);
	if (status != 0)
	error("%s: pcap_set_snaplen failed: %s",
	device, pcap_statustostr(status));
	if (immediate) {
	status = pcap_set_immediate_mode(pd, 1);
	if (status != 0)
	error("%s: pcap_set_immediate_mode failed: %s",
	device, pcap_statustostr(status));
	}
	status = pcap_set_timeout(pd, timeout);
	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));
	}
	if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
	localnet = 0;
	netmask = 0;
	warning("%s", ebuf);
	}
	cmdbuf = copy_argv(&argv[optind]);

	if (pcap_compile(pd, &fcode, cmdbuf, 1, netmask) < 0)
	error("%s", pcap_geterr(pd));

	if (pcap_setfilter(pd, &fcode) < 0)
	error("%s", pcap_geterr(pd));
	if (pcap_setnonblock(pd, nonblock, ebuf) == -1)
	error("pcap_setnonblock failed: %s", ebuf);
	printf("Listening on %s\n", device);
	for (;;) {
	packet_count = 0;
	status = pcap_dispatch(pd, -1, countme,
	(u_char *)&packet_count);
	if (status < 0)
	break;
	if (status != 0) {
	printf("%d packets seen, %d packets counted after pcap_dispatch returns\n",
	status, packet_count);
	}
	}
	if (status == -2) {
	/*
	* We got interrupted, so perhaps we didn't
	* manage to finish a line we were printing.
	* Print an extra newline, just in case.
	*/
	putchar('\n');
	}
	(void)fflush(stdout);
	if (status == -1) {
	/*
	* Error. Report it.
	*/
	(void)fprintf(stderr, "%s: pcap_loop: %s\n",
	program_name, pcap_geterr(pd));
	}
	pcap_close(pd);
	exit(status == -1 ? 1 : 0);
	}

	static void
	countme(u_char user, const struct pcap_pkthdr h, const u_char *sp)
	{
	int counterp = (int )user;

	(*counterp)++;
	}

	static void
	usage(void)
	{
	(void)fprintf(stderr, "Usage: %s [ -mn ] [ -i interface ] [ -t timeout] [expression]\n",
	program_name);
	exit(1);
	}

	/* 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;
	}