src/iperf_util.c - platform/external/iperf3 - Git at Google

 /*
  * iperf, Copyright (c) 2014, 2016, The Regents of the University of
  * California, through Lawrence Berkeley National Laboratory (subject
  * to receipt of any required approvals from the U.S. Dept. of
  * Energy).  All rights reserved.
  *
  * If you have questions about your rights to use or distribute this
  * software, please contact Berkeley Lab's Technology Transfer
  * Department at [email protected].
  *
  * NOTICE.  This software is owned by the U.S. Department of Energy.
  * As such, the U.S. Government has been granted for itself and others
  * acting on its behalf a paid-up, nonexclusive, irrevocable,
  * worldwide license in the Software to reproduce, prepare derivative
  * works, and perform publicly and display publicly.  Beginning five
  * (5) years after the date permission to assert copyright is obtained
  * from the U.S. Department of Energy, and subject to any subsequent
  * five (5) year renewals, the U.S. Government is granted for itself
  * and others acting on its behalf a paid-up, nonexclusive,
  * irrevocable, worldwide license in the Software to reproduce,
  * prepare derivative works, distribute copies to the public, perform
  * publicly and display publicly, and to permit others to do so.
  *
  * This code is distributed under a BSD style license, see the LICENSE
  * file for complete information.
  */
 /* iperf_util.c
  *
  * Iperf utility functions
  *
  */
 #include "iperf_config.h"

 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include <string.h>
 #include <stdarg.h>
 #include <sys/select.h>
 #include <sys/types.h>
 #include <sys/time.h>
 #include <sys/resource.h>
 #include <sys/utsname.h>
 #include <time.h>
 #include <errno.h>

 #include "cjson.h"

 /* make_cookie
  *
  * Generate and return a cookie string
  *
  * Iperf uses this function to create test "cookies" which
  * server as unique test identifiers. These cookies are also
  * used for the authentication of stream connections.
  */

 void
 make_cookie(char *cookie)
 {
     static int randomized = 0;
     char hostname[500];
     struct timeval tv;
     char temp[1000];

     if ( ! randomized )
         srandom((int) time(0) ^ getpid());

     /* Generate a string based on hostname, time, randomness, and filler. */
     (void) gethostname(hostname, sizeof(hostname));
     (void) gettimeofday(&tv, 0);
     (void) snprintf(temp, sizeof(temp), "%s.%ld.%06ld.%08lx%08lx.%s", hostname, (unsigned long int) tv.tv_sec, (unsigned long int) tv.tv_usec, (unsigned long int) random(), (unsigned long int) random(), "1234567890123456789012345678901234567890");

     /* Now truncate it to 36 bytes and terminate. */
     memcpy(cookie, temp, 36);
     cookie[36] = '\0';
 }


 /* is_closed
  *
  * Test if the file descriptor fd is closed.
  *
  * Iperf uses this function to test whether a TCP stream socket
  * is closed, because accepting and denying an invalid connection
  * in iperf_tcp_accept is not considered an error.
  */

 int
 is_closed(int fd)
 {
     struct timeval tv;
     fd_set readset;

     FD_ZERO(&readset);
     FD_SET(fd, &readset);
     tv.tv_sec = 0;
     tv.tv_usec = 0;

     if (select(fd+1, &readset, NULL, NULL, &tv) < 0) {
         if (errno == EBADF)
             return 1;
     }
     return 0;
 }


 double
 timeval_to_double(struct timeval * tv)
 {
     double d;

     d = tv->tv_sec + tv->tv_usec / 1000000;

     return d;
 }

 int
 timeval_equals(struct timeval * tv0, struct timeval * tv1)
 {
     if ( tv0->tv_sec == tv1->tv_sec && tv0->tv_usec == tv1->tv_usec )
 	return 1;
     else
 	return 0;
 }

 double
 timeval_diff(struct timeval * tv0, struct timeval * tv1)
 {
     double time1, time2;

     time1 = tv0->tv_sec + (tv0->tv_usec / 1000000.0);
     time2 = tv1->tv_sec + (tv1->tv_usec / 1000000.0);

     time1 = time1 - time2;
     if (time1 < 0)
         time1 = -time1;
     return time1;
 }


 int
 delay(int64_t ns)
 {
     struct timespec req, rem;

     req.tv_sec = 0;

     while (ns >= 1000000000L) {
         ns -= 1000000000L;
         req.tv_sec += 1;
     }

     req.tv_nsec = ns;

     while (nanosleep(&req, &rem) == -1)
         if (EINTR == errno)
             memcpy(&req, &rem, sizeof(rem));
         else
             return -1;
     return 0;
 }

 # ifdef DELAY_SELECT_METHOD
 int
 delay(int us)
 {
     struct timeval tv;

     tv.tv_sec = 0;
     tv.tv_usec = us;
     (void) select(1, (fd_set *) 0, (fd_set *) 0, (fd_set *) 0, &tv);
     return 1;
 }
 #endif


 void
 cpu_util(double pcpu[3])
 {
     static struct timeval last;
     static clock_t clast;
     static struct rusage rlast;
     struct timeval temp;
     clock_t ctemp;
     struct rusage rtemp;
     double timediff;
     double userdiff;
     double systemdiff;

     if (pcpu == NULL) {
         gettimeofday(&last, NULL);
         clast = clock();
 	getrusage(RUSAGE_SELF, &rlast);
         return;
     }

     gettimeofday(&temp, NULL);
     ctemp = clock();
     getrusage(RUSAGE_SELF, &rtemp);

     timediff = ((temp.tv_sec * 1000000.0 + temp.tv_usec) -
                 (last.tv_sec * 1000000.0 + last.tv_usec));
     userdiff = ((rtemp.ru_utime.tv_sec * 1000000.0 + rtemp.ru_utime.tv_usec) -
                 (rlast.ru_utime.tv_sec * 1000000.0 + rlast.ru_utime.tv_usec));
     systemdiff = ((rtemp.ru_stime.tv_sec * 1000000.0 + rtemp.ru_stime.tv_usec) -
                   (rlast.ru_stime.tv_sec * 1000000.0 + rlast.ru_stime.tv_usec));

     pcpu[0] = (((ctemp - clast) * 1000000.0 / CLOCKS_PER_SEC) / timediff) * 100;
     pcpu[1] = (userdiff / timediff) * 100;
     pcpu[2] = (systemdiff / timediff) * 100;
 }

 const char *
 get_system_info(void)
 {
     static char buf[1024];
     struct utsname  uts;

     memset(buf, 0, 1024);
     uname(&uts);

     snprintf(buf, sizeof(buf), "%s %s %s %s %s", uts.sysname, uts.nodename,
 	     uts.release, uts.version, uts.machine);

     return buf;
 }


 const char *
 get_optional_features(void)
 {
     static char features[1024];
     unsigned int numfeatures = 0;

     snprintf(features, sizeof(features), "Optional features available: ");

 #if defined(HAVE_CPU_AFFINITY)
     if (numfeatures > 0) {
 	strncat(features, ", ",
 		sizeof(features) - strlen(features) - 1);
     }
     strncat(features, "CPU affinity setting",
 	sizeof(features) - strlen(features) - 1);
     numfeatures++;
 #endif /* HAVE_CPU_AFFINITY */

 #if defined(HAVE_FLOWLABEL)
     if (numfeatures > 0) {
 	strncat(features, ", ",
 		sizeof(features) - strlen(features) - 1);
     }
     strncat(features, "IPv6 flow label",
 	sizeof(features) - strlen(features) - 1);
     numfeatures++;
 #endif /* HAVE_FLOWLABEL */

 #if defined(HAVE_SCTP)
     if (numfeatures > 0) {
 	strncat(features, ", ",
 		sizeof(features) - strlen(features) - 1);
     }
     strncat(features, "SCTP",
 	sizeof(features) - strlen(features) - 1);
     numfeatures++;
 #endif /* HAVE_SCTP */

 #if defined(HAVE_TCP_CONGESTION)
     if (numfeatures > 0) {
 	strncat(features, ", ",
 		sizeof(features) - strlen(features) - 1);
     }
     strncat(features, "TCP congestion algorithm setting",
 	sizeof(features) - strlen(features) - 1);
     numfeatures++;
 #endif /* HAVE_TCP_CONGESTION */

 #if defined(HAVE_SENDFILE)
     if (numfeatures > 0) {
 	strncat(features, ", ",
 		sizeof(features) - strlen(features) - 1);
     }
     strncat(features, "sendfile / zerocopy",
 	sizeof(features) - strlen(features) - 1);
     numfeatures++;
 #endif /* HAVE_SENDFILE */

 #if defined(HAVE_SO_MAX_PACING_RATE)
     if (numfeatures > 0) {
 	strncat(features, ", ",
 		sizeof(features) - strlen(features) - 1);
     }
     strncat(features, "socket pacing",
 	sizeof(features) - strlen(features) - 1);
     numfeatures++;
 #endif /* HAVE_SO_MAX_PACING_RATE */

     if (numfeatures == 0) {
 	strncat(features, "None",
 		sizeof(features) - strlen(features) - 1);
     }

     return features;
 }

 /* Helper routine for building cJSON objects in a printf-like manner.
 **
 ** Sample call:
 **   j = iperf_json_printf("foo: %b  bar: %d  bletch: %f  eep: %s", b, i, f, s);
 **
 ** The four formatting characters and the types they expect are:
 **   %b  boolean           int
 **   %d  integer           int64_t
 **   %f  floating point    double
 **   %s  string            char *
 ** If the values you're passing in are not these exact types, you must
 ** cast them, there is no automatic type coercion/widening here.
 **
 ** The colons mark the end of field names, and blanks are ignored.
 **
 ** This routine is not particularly robust, but it's not part of the API,
 ** it's just for internal iperf3 use.
 */
 cJSON*
 iperf_json_printf(const char *format, ...)
 {
     cJSON* o;
     va_list argp;
     const char *cp;
     char name[100];
     char* np;
     cJSON* j;

     o = cJSON_CreateObject();
     if (o == NULL)
         return NULL;
     va_start(argp, format);
     np = name;
     for (cp = format; *cp != '\0'; ++cp) {
 	switch (*cp) {
 	    case ' ':
 	    break;
 	    case ':':
 	    *np = '\0';
 	    break;
 	    case '%':
 	    ++cp;
 	    switch (*cp) {
 		case 'b':
 		j = cJSON_CreateBool(va_arg(argp, int));
 		break;
 		case 'd':
 		j = cJSON_CreateNumber(va_arg(argp, int64_t));
 		break;
 		case 'f':
 		j = cJSON_CreateNumber(va_arg(argp, double));
 		break;
 		case 's':
 		j = cJSON_CreateString(va_arg(argp, char *));
 		break;
 		default:
 		va_end(argp);
 		return NULL;
 	    }
 	    if (j == NULL) {
 	    	va_end(argp);
 	    	return NULL;
 	    }
 	    cJSON_AddItemToObject(o, name, j);
 	    np = name;
 	    break;
 	    default:
 	    *np++ = *cp;
 	    break;
 	}
     }
     va_end(argp);
     return o;
 }

 /* Debugging routine to dump out an fd_set. */
 void
 iperf_dump_fdset(FILE *fp, char *str, int nfds, fd_set *fds)
 {
     int fd;
     int comma;

     fprintf(fp, "%s: [", str);
     comma = 0;
     for (fd = 0; fd < nfds; ++fd) {
         if (FD_ISSET(fd, fds)) {
 	    if (comma)
 		fprintf(fp, ", ");
 	    fprintf(fp, "%d", fd);
 	    comma = 1;
 	}
     }
     fprintf(fp, "]\n");
 }
	/*
	* iperf, Copyright (c) 2014, 2016, The Regents of the University of
	* California, through Lawrence Berkeley National Laboratory (subject
	* to receipt of any required approvals from the U.S. Dept. of
	* Energy). All rights reserved.
	*
	* If you have questions about your rights to use or distribute this
	* software, please contact Berkeley Lab's Technology Transfer
	* Department at [email protected].
	*
	* NOTICE. This software is owned by the U.S. Department of Energy.
	* As such, the U.S. Government has been granted for itself and others
	* acting on its behalf a paid-up, nonexclusive, irrevocable,
	* worldwide license in the Software to reproduce, prepare derivative
	* works, and perform publicly and display publicly. Beginning five
	* (5) years after the date permission to assert copyright is obtained
	* from the U.S. Department of Energy, and subject to any subsequent
	* five (5) year renewals, the U.S. Government is granted for itself
	* and others acting on its behalf a paid-up, nonexclusive,
	* irrevocable, worldwide license in the Software to reproduce,
	* prepare derivative works, distribute copies to the public, perform
	* publicly and display publicly, and to permit others to do so.
	*
	* This code is distributed under a BSD style license, see the LICENSE
	* file for complete information.
	*/
	/* iperf_util.c
	*
	* Iperf utility functions
	*
	*/
	#include "iperf_config.h"

	#include <stdio.h>
	#include <stdlib.h>
	#include <unistd.h>
	#include <string.h>
	#include <stdarg.h>
	#include <sys/select.h>
	#include <sys/types.h>
	#include <sys/time.h>
	#include <sys/resource.h>
	#include <sys/utsname.h>
	#include <time.h>
	#include <errno.h>

	#include "cjson.h"

	/* make_cookie
	*
	* Generate and return a cookie string
	*
	* Iperf uses this function to create test "cookies" which
	* server as unique test identifiers. These cookies are also
	* used for the authentication of stream connections.
	*/

	void
	make_cookie(char *cookie)
	{
	static int randomized = 0;
	char hostname[500];
	struct timeval tv;
	char temp[1000];

	if ( ! randomized )
	srandom((int) time(0) ^ getpid());

	/* Generate a string based on hostname, time, randomness, and filler. */
	(void) gethostname(hostname, sizeof(hostname));
	(void) gettimeofday(&tv, 0);
	(void) snprintf(temp, sizeof(temp), "%s.%ld.%06ld.%08lx%08lx.%s", hostname, (unsigned long int) tv.tv_sec, (unsigned long int) tv.tv_usec, (unsigned long int) random(), (unsigned long int) random(), "1234567890123456789012345678901234567890");

	/* Now truncate it to 36 bytes and terminate. */
	memcpy(cookie, temp, 36);
	cookie[36] = '\0';
	}


	/* is_closed
	*
	* Test if the file descriptor fd is closed.
	*
	* Iperf uses this function to test whether a TCP stream socket
	* is closed, because accepting and denying an invalid connection
	* in iperf_tcp_accept is not considered an error.
	*/

	int
	is_closed(int fd)
	{
	struct timeval tv;
	fd_set readset;

	FD_ZERO(&readset);
	FD_SET(fd, &readset);
	tv.tv_sec = 0;
	tv.tv_usec = 0;

	if (select(fd+1, &readset, NULL, NULL, &tv) < 0) {
	if (errno == EBADF)
	return 1;
	}
	return 0;
	}


	double
	timeval_to_double(struct timeval * tv)
	{
	double d;

	d = tv->tv_sec + tv->tv_usec / 1000000;

	return d;
	}

	int
	timeval_equals(struct timeval * tv0, struct timeval * tv1)
	{
	if ( tv0->tv_sec == tv1->tv_sec && tv0->tv_usec == tv1->tv_usec )
	return 1;
	else
	return 0;
	}

	double
	timeval_diff(struct timeval * tv0, struct timeval * tv1)
	{
	double time1, time2;

	time1 = tv0->tv_sec + (tv0->tv_usec / 1000000.0);
	time2 = tv1->tv_sec + (tv1->tv_usec / 1000000.0);

	time1 = time1 - time2;
	if (time1 < 0)
	time1 = -time1;
	return time1;
	}


	int
	delay(int64_t ns)
	{
	struct timespec req, rem;

	req.tv_sec = 0;

	while (ns >= 1000000000L) {
	ns -= 1000000000L;
	req.tv_sec += 1;
	}

	req.tv_nsec = ns;

	while (nanosleep(&req, &rem) == -1)
	if (EINTR == errno)
	memcpy(&req, &rem, sizeof(rem));
	else
	return -1;
	return 0;
	}

	# ifdef DELAY_SELECT_METHOD
	int
	delay(int us)
	{
	struct timeval tv;

	tv.tv_sec = 0;
	tv.tv_usec = us;
	(void) select(1, (fd_set ) 0, (fd_set ) 0, (fd_set *) 0, &tv);
	return 1;
	}
	#endif


	void
	cpu_util(double pcpu[3])
	{
	static struct timeval last;
	static clock_t clast;
	static struct rusage rlast;
	struct timeval temp;
	clock_t ctemp;
	struct rusage rtemp;
	double timediff;
	double userdiff;
	double systemdiff;

	if (pcpu == NULL) {
	gettimeofday(&last, NULL);
	clast = clock();
	getrusage(RUSAGE_SELF, &rlast);
	return;
	}

	gettimeofday(&temp, NULL);
	ctemp = clock();
	getrusage(RUSAGE_SELF, &rtemp);

	timediff = ((temp.tv_sec * 1000000.0 + temp.tv_usec) -
	(last.tv_sec * 1000000.0 + last.tv_usec));
	userdiff = ((rtemp.ru_utime.tv_sec * 1000000.0 + rtemp.ru_utime.tv_usec) -
	(rlast.ru_utime.tv_sec * 1000000.0 + rlast.ru_utime.tv_usec));
	systemdiff = ((rtemp.ru_stime.tv_sec * 1000000.0 + rtemp.ru_stime.tv_usec) -
	(rlast.ru_stime.tv_sec * 1000000.0 + rlast.ru_stime.tv_usec));

	pcpu[0] = (((ctemp - clast) * 1000000.0 / CLOCKS_PER_SEC) / timediff) * 100;
	pcpu[1] = (userdiff / timediff) * 100;
	pcpu[2] = (systemdiff / timediff) * 100;
	}

	const char *
	get_system_info(void)
	{
	static char buf[1024];
	struct utsname uts;

	memset(buf, 0, 1024);
	uname(&uts);

	snprintf(buf, sizeof(buf), "%s %s %s %s %s", uts.sysname, uts.nodename,
	uts.release, uts.version, uts.machine);

	return buf;
	}


	const char *
	get_optional_features(void)
	{
	static char features[1024];
	unsigned int numfeatures = 0;

	snprintf(features, sizeof(features), "Optional features available: ");

	#if defined(HAVE_CPU_AFFINITY)
	if (numfeatures > 0) {
	strncat(features, ", ",
	sizeof(features) - strlen(features) - 1);
	}
	strncat(features, "CPU affinity setting",
	sizeof(features) - strlen(features) - 1);
	numfeatures++;
	#endif /* HAVE_CPU_AFFINITY */

	#if defined(HAVE_FLOWLABEL)
	if (numfeatures > 0) {
	strncat(features, ", ",
	sizeof(features) - strlen(features) - 1);
	}
	strncat(features, "IPv6 flow label",
	sizeof(features) - strlen(features) - 1);
	numfeatures++;
	#endif /* HAVE_FLOWLABEL */

	#if defined(HAVE_SCTP)
	if (numfeatures > 0) {
	strncat(features, ", ",
	sizeof(features) - strlen(features) - 1);
	}
	strncat(features, "SCTP",
	sizeof(features) - strlen(features) - 1);
	numfeatures++;
	#endif /* HAVE_SCTP */

	#if defined(HAVE_TCP_CONGESTION)
	if (numfeatures > 0) {
	strncat(features, ", ",
	sizeof(features) - strlen(features) - 1);
	}
	strncat(features, "TCP congestion algorithm setting",
	sizeof(features) - strlen(features) - 1);
	numfeatures++;
	#endif /* HAVE_TCP_CONGESTION */

	#if defined(HAVE_SENDFILE)
	if (numfeatures > 0) {
	strncat(features, ", ",
	sizeof(features) - strlen(features) - 1);
	}
	strncat(features, "sendfile / zerocopy",
	sizeof(features) - strlen(features) - 1);
	numfeatures++;
	#endif /* HAVE_SENDFILE */

	#if defined(HAVE_SO_MAX_PACING_RATE)
	if (numfeatures > 0) {
	strncat(features, ", ",
	sizeof(features) - strlen(features) - 1);
	}
	strncat(features, "socket pacing",
	sizeof(features) - strlen(features) - 1);
	numfeatures++;
	#endif /* HAVE_SO_MAX_PACING_RATE */

	if (numfeatures == 0) {
	strncat(features, "None",
	sizeof(features) - strlen(features) - 1);
	}

	return features;
	}

	/* Helper routine for building cJSON objects in a printf-like manner.
	**
	** Sample call:
	** j = iperf_json_printf("foo: %b bar: %d bletch: %f eep: %s", b, i, f, s);
	**
	** The four formatting characters and the types they expect are:
	** %b boolean int
	** %d integer int64_t
	** %f floating point double
	** %s string char *
	** If the values you're passing in are not these exact types, you must
	** cast them, there is no automatic type coercion/widening here.
	**
	** The colons mark the end of field names, and blanks are ignored.
	**
	** This routine is not particularly robust, but it's not part of the API,
	** it's just for internal iperf3 use.
	*/
	cJSON*
	iperf_json_printf(const char *format, ...)
	{
	cJSON* o;
	va_list argp;
	const char *cp;
	char name[100];
	char* np;
	cJSON* j;

	o = cJSON_CreateObject();
	if (o == NULL)
	return NULL;
	va_start(argp, format);
	np = name;
	for (cp = format; *cp != '\0'; ++cp) {
	switch (*cp) {
	case ' ':
	break;
	case ':':
	*np = '\0';
	break;
	case '%':
	++cp;
	switch (*cp) {
	case 'b':
	j = cJSON_CreateBool(va_arg(argp, int));
	break;
	case 'd':
	j = cJSON_CreateNumber(va_arg(argp, int64_t));
	break;
	case 'f':
	j = cJSON_CreateNumber(va_arg(argp, double));
	break;
	case 's':
	j = cJSON_CreateString(va_arg(argp, char *));
	break;
	default:
	va_end(argp);
	return NULL;
	}
	if (j == NULL) {
	va_end(argp);
	return NULL;
	}
	cJSON_AddItemToObject(o, name, j);
	np = name;
	break;
	default:
	np++ = cp;
	break;
	}
	}
	va_end(argp);
	return o;
	}

	/* Debugging routine to dump out an fd_set. */
	void
	iperf_dump_fdset(FILE fp, char str, int nfds, fd_set *fds)
	{
	int fd;
	int comma;

	fprintf(fp, "%s: [", str);
	comma = 0;
	for (fd = 0; fd < nfds; ++fd) {
	if (FD_ISSET(fd, fds)) {
	if (comma)
	fprintf(fp, ", ");
	fprintf(fp, "%d", fd);
	comma = 1;
	}
	}
	fprintf(fp, "]\n");
	}