1: /*
2: * iperf, Copyright (c) 2014, 2016, 2017, The Regents of the University of
3: * California, through Lawrence Berkeley National Laboratory (subject
4: * to receipt of any required approvals from the U.S. Dept. of
5: * Energy). All rights reserved.
6: *
7: * If you have questions about your rights to use or distribute this
8: * software, please contact Berkeley Lab's Technology Transfer
9: * Department at TTD@lbl.gov.
10: *
11: * NOTICE. This software is owned by the U.S. Department of Energy.
12: * As such, the U.S. Government has been granted for itself and others
13: * acting on its behalf a paid-up, nonexclusive, irrevocable,
14: * worldwide license in the Software to reproduce, prepare derivative
15: * works, and perform publicly and display publicly. Beginning five
16: * (5) years after the date permission to assert copyright is obtained
17: * from the U.S. Department of Energy, and subject to any subsequent
18: * five (5) year renewals, the U.S. Government is granted for itself
19: * and others acting on its behalf a paid-up, nonexclusive,
20: * irrevocable, worldwide license in the Software to reproduce,
21: * prepare derivative works, distribute copies to the public, perform
22: * publicly and display publicly, and to permit others to do so.
23: *
24: * This code is distributed under a BSD style license, see the LICENSE
25: * file for complete information.
26: */
27: /* iperf_util.c
28: *
29: * Iperf utility functions
30: *
31: */
32: #include "iperf_config.h"
33:
34: #include <stdio.h>
35: #include <signal.h>
36: #include <stdlib.h>
37: #include <unistd.h>
38: #include <string.h>
39: #include <stdarg.h>
40: #include <sys/select.h>
41: #include <sys/types.h>
42: #include <sys/time.h>
43: #include <sys/resource.h>
44: #include <sys/utsname.h>
45: #include <time.h>
46: #include <errno.h>
47: #include <fcntl.h>
48:
49: #include "cjson.h"
50: #include "iperf.h"
51: #include "iperf_api.h"
52:
53: /*
54: * Read entropy from /dev/urandom
55: * Errors are fatal.
56: * Returns 0 on success.
57: */
58: int readentropy(void *out, size_t outsize)
59: {
60: static FILE *frandom;
61: static const char rndfile[] = "/dev/urandom";
62:
63: if (!outsize) return 0;
64:
65: if (frandom == NULL) {
66: frandom = fopen(rndfile, "rb");
67: if (frandom == NULL) {
68: iperf_errexit(NULL, "error - failed to open %s: %s\n",
69: rndfile, strerror(errno));
70: }
71: setbuf(frandom, NULL);
72: }
73: if (fread(out, 1, outsize, frandom) != outsize) {
74: iperf_errexit(NULL, "error - failed to read %s: %s\n",
75: rndfile,
76: feof(frandom) ? "EOF" : strerror(errno));
77: }
78: return 0;
79: }
80:
81:
82: /*
83: * Fills buffer with repeating pattern (similar to pattern that used in iperf2)
84: */
85: void fill_with_repeating_pattern(void *out, size_t outsize)
86: {
87: size_t i;
88: int counter = 0;
89: char *buf = (char *)out;
90:
91: if (!outsize) return;
92:
93: for (i = 0; i < outsize; i++) {
94: buf[i] = (char)('0' + counter);
95: if (counter >= 9)
96: counter = 0;
97: else
98: counter++;
99: }
100: }
101:
102:
103: /* make_cookie
104: *
105: * Generate and return a cookie string
106: *
107: * Iperf uses this function to create test "cookies" which
108: * server as unique test identifiers. These cookies are also
109: * used for the authentication of stream connections.
110: * Assumes cookie has size (COOKIE_SIZE + 1) char's.
111: */
112:
113: void
114: make_cookie(const char *cookie)
115: {
116: unsigned char *out = (unsigned char*)cookie;
117: size_t pos;
118: static const unsigned char rndchars[] = "abcdefghijklmnopqrstuvwxyz234567";
119:
120: readentropy(out, COOKIE_SIZE);
121: for (pos = 0; pos < (COOKIE_SIZE - 1); pos++) {
122: out[pos] = rndchars[out[pos] % (sizeof(rndchars) - 1)];
123: }
124: out[pos] = '\0';
125: }
126:
127:
128: /* is_closed
129: *
130: * Test if the file descriptor fd is closed.
131: *
132: * Iperf uses this function to test whether a TCP stream socket
133: * is closed, because accepting and denying an invalid connection
134: * in iperf_tcp_accept is not considered an error.
135: */
136:
137: int
138: is_closed(int fd)
139: {
140: struct timeval tv;
141: fd_set readset;
142:
143: FD_ZERO(&readset);
144: FD_SET(fd, &readset);
145: tv.tv_sec = 0;
146: tv.tv_usec = 0;
147:
148: if (select(fd+1, &readset, NULL, NULL, &tv) < 0) {
149: if (errno == EBADF)
150: return 1;
151: }
152: return 0;
153: }
154:
155:
156: double
157: timeval_to_double(struct timeval * tv)
158: {
159: double d;
160:
161: d = tv->tv_sec + tv->tv_usec / 1000000;
162:
163: return d;
164: }
165:
166: int
167: timeval_equals(struct timeval * tv0, struct timeval * tv1)
168: {
169: if ( tv0->tv_sec == tv1->tv_sec && tv0->tv_usec == tv1->tv_usec )
170: return 1;
171: else
172: return 0;
173: }
174:
175: double
176: timeval_diff(struct timeval * tv0, struct timeval * tv1)
177: {
178: double time1, time2;
179:
180: time1 = tv0->tv_sec + (tv0->tv_usec / 1000000.0);
181: time2 = tv1->tv_sec + (tv1->tv_usec / 1000000.0);
182:
183: time1 = time1 - time2;
184: if (time1 < 0)
185: time1 = -time1;
186: return time1;
187: }
188:
189: void
190: cpu_util(double pcpu[3])
191: {
192: static struct iperf_time last;
193: static clock_t clast;
194: static struct rusage rlast;
195: struct iperf_time now, temp_time;
196: clock_t ctemp;
197: struct rusage rtemp;
198: double timediff;
199: double userdiff;
200: double systemdiff;
201:
202: if (pcpu == NULL) {
203: iperf_time_now(&last);
204: clast = clock();
205: getrusage(RUSAGE_SELF, &rlast);
206: return;
207: }
208:
209: iperf_time_now(&now);
210: ctemp = clock();
211: getrusage(RUSAGE_SELF, &rtemp);
212:
213: iperf_time_diff(&now, &last, &temp_time);
214: timediff = iperf_time_in_usecs(&temp_time);
215:
216: userdiff = ((rtemp.ru_utime.tv_sec * 1000000.0 + rtemp.ru_utime.tv_usec) -
217: (rlast.ru_utime.tv_sec * 1000000.0 + rlast.ru_utime.tv_usec));
218: systemdiff = ((rtemp.ru_stime.tv_sec * 1000000.0 + rtemp.ru_stime.tv_usec) -
219: (rlast.ru_stime.tv_sec * 1000000.0 + rlast.ru_stime.tv_usec));
220:
221: pcpu[0] = (((ctemp - clast) * 1000000.0 / CLOCKS_PER_SEC) / timediff) * 100;
222: pcpu[1] = (userdiff / timediff) * 100;
223: pcpu[2] = (systemdiff / timediff) * 100;
224: }
225:
226: const char *
227: get_system_info(void)
228: {
229: static char buf[1024];
230: struct utsname uts;
231:
232: memset(buf, 0, 1024);
233: uname(&uts);
234:
235: snprintf(buf, sizeof(buf), "%s %s %s %s %s", uts.sysname, uts.nodename,
236: uts.release, uts.version, uts.machine);
237:
238: return buf;
239: }
240:
241:
242: const char *
243: get_optional_features(void)
244: {
245: static char features[1024];
246: unsigned int numfeatures = 0;
247:
248: snprintf(features, sizeof(features), "Optional features available: ");
249:
250: #if defined(HAVE_CPU_AFFINITY)
251: if (numfeatures > 0) {
252: strncat(features, ", ",
253: sizeof(features) - strlen(features) - 1);
254: }
255: strncat(features, "CPU affinity setting",
256: sizeof(features) - strlen(features) - 1);
257: numfeatures++;
258: #endif /* HAVE_CPU_AFFINITY */
259:
260: #if defined(HAVE_FLOWLABEL)
261: if (numfeatures > 0) {
262: strncat(features, ", ",
263: sizeof(features) - strlen(features) - 1);
264: }
265: strncat(features, "IPv6 flow label",
266: sizeof(features) - strlen(features) - 1);
267: numfeatures++;
268: #endif /* HAVE_FLOWLABEL */
269:
270: #if defined(HAVE_SCTP_H)
271: if (numfeatures > 0) {
272: strncat(features, ", ",
273: sizeof(features) - strlen(features) - 1);
274: }
275: strncat(features, "SCTP",
276: sizeof(features) - strlen(features) - 1);
277: numfeatures++;
278: #endif /* HAVE_SCTP_H */
279:
280: #if defined(HAVE_TCP_CONGESTION)
281: if (numfeatures > 0) {
282: strncat(features, ", ",
283: sizeof(features) - strlen(features) - 1);
284: }
285: strncat(features, "TCP congestion algorithm setting",
286: sizeof(features) - strlen(features) - 1);
287: numfeatures++;
288: #endif /* HAVE_TCP_CONGESTION */
289:
290: #if defined(HAVE_SENDFILE)
291: if (numfeatures > 0) {
292: strncat(features, ", ",
293: sizeof(features) - strlen(features) - 1);
294: }
295: strncat(features, "sendfile / zerocopy",
296: sizeof(features) - strlen(features) - 1);
297: numfeatures++;
298: #endif /* HAVE_SENDFILE */
299:
300: #if defined(HAVE_SO_MAX_PACING_RATE)
301: if (numfeatures > 0) {
302: strncat(features, ", ",
303: sizeof(features) - strlen(features) - 1);
304: }
305: strncat(features, "socket pacing",
306: sizeof(features) - strlen(features) - 1);
307: numfeatures++;
308: #endif /* HAVE_SO_MAX_PACING_RATE */
309:
310: #if defined(HAVE_SSL)
311: if (numfeatures > 0) {
312: strncat(features, ", ",
313: sizeof(features) - strlen(features) - 1);
314: }
315: strncat(features, "authentication",
316: sizeof(features) - strlen(features) - 1);
317: numfeatures++;
318: #endif /* HAVE_SSL */
319:
320: if (numfeatures == 0) {
321: strncat(features, "None",
322: sizeof(features) - strlen(features) - 1);
323: }
324:
325: return features;
326: }
327:
328: /* Helper routine for building cJSON objects in a printf-like manner.
329: **
330: ** Sample call:
331: ** j = iperf_json_printf("foo: %b bar: %d bletch: %f eep: %s", b, i, f, s);
332: **
333: ** The four formatting characters and the types they expect are:
334: ** %b boolean int
335: ** %d integer int64_t
336: ** %f floating point double
337: ** %s string char *
338: ** If the values you're passing in are not these exact types, you must
339: ** cast them, there is no automatic type coercion/widening here.
340: **
341: ** The colons mark the end of field names, and blanks are ignored.
342: **
343: ** This routine is not particularly robust, but it's not part of the API,
344: ** it's just for internal iperf3 use.
345: */
346: cJSON*
347: iperf_json_printf(const char *format, ...)
348: {
349: cJSON* o;
350: va_list argp;
351: const char *cp;
352: char name[100];
353: char* np;
354: cJSON* j;
355:
356: o = cJSON_CreateObject();
357: if (o == NULL)
358: return NULL;
359: va_start(argp, format);
360: np = name;
361: for (cp = format; *cp != '\0'; ++cp) {
362: switch (*cp) {
363: case ' ':
364: break;
365: case ':':
366: *np = '\0';
367: break;
368: case '%':
369: ++cp;
370: switch (*cp) {
371: case 'b':
372: j = cJSON_CreateBool(va_arg(argp, int));
373: break;
374: case 'd':
375: j = cJSON_CreateNumber(va_arg(argp, int64_t));
376: break;
377: case 'f':
378: j = cJSON_CreateNumber(va_arg(argp, double));
379: break;
380: case 's':
381: j = cJSON_CreateString(va_arg(argp, char *));
382: break;
383: default:
384: va_end(argp);
385: return NULL;
386: }
387: if (j == NULL) {
388: va_end(argp);
389: return NULL;
390: }
391: cJSON_AddItemToObject(o, name, j);
392: np = name;
393: break;
394: default:
395: *np++ = *cp;
396: break;
397: }
398: }
399: va_end(argp);
400: return o;
401: }
402:
403: /* Debugging routine to dump out an fd_set. */
404: void
405: iperf_dump_fdset(FILE *fp, const char *str, int nfds, fd_set *fds)
406: {
407: int fd;
408: int comma;
409:
410: fprintf(fp, "%s: [", str);
411: comma = 0;
412: for (fd = 0; fd < nfds; ++fd) {
413: if (FD_ISSET(fd, fds)) {
414: if (comma)
415: fprintf(fp, ", ");
416: fprintf(fp, "%d", fd);
417: comma = 1;
418: }
419: }
420: fprintf(fp, "]\n");
421: }
422:
423: /*
424: * daemon(3) implementation for systems lacking one.
425: * Cobbled together from various daemon(3) implementations,
426: * not intended to be general-purpose. */
427: #ifndef HAVE_DAEMON
428: int daemon(int nochdir, int noclose)
429: {
430: pid_t pid = 0;
431: pid_t sid = 0;
432: int fd;
433:
434: /*
435: * Ignore any possible SIGHUP when the parent process exits.
436: * Note that the iperf3 server process will eventually install
437: * its own signal handler for SIGHUP, so we can be a little
438: * sloppy about not restoring the prior value. This does not
439: * generalize.
440: */
441: signal(SIGHUP, SIG_IGN);
442:
443: pid = fork();
444: if (pid < 0) {
445: return -1;
446: }
447: if (pid > 0) {
448: /* Use _exit() to avoid doing atexit() stuff. */
449: _exit(0);
450: }
451:
452: sid = setsid();
453: if (sid < 0) {
454: return -1;
455: }
456:
457: /*
458: * Fork again to avoid becoming a session leader.
459: * This might only matter on old SVr4-derived OSs.
460: * Note in particular that glibc and FreeBSD libc
461: * only fork once.
462: */
463: pid = fork();
464: if (pid == -1) {
465: return -1;
466: } else if (pid != 0) {
467: _exit(0);
468: }
469:
470: if (!nochdir) {
471: chdir("/");
472: }
473:
474: if (!noclose && (fd = open("/dev/null", O_RDWR, 0)) != -1) {
475: dup2(fd, STDIN_FILENO);
476: dup2(fd, STDOUT_FILENO);
477: dup2(fd, STDERR_FILENO);
478: if (fd > 2) {
479: close(fd);
480: }
481: }
482: return (0);
483: }
484: #endif /* HAVE_DAEMON */
485:
486: /* Compatibility version of getline(3) for systems that don't have it.. */
487: #ifndef HAVE_GETLINE
488: /* The following code adopted from NetBSD's getline.c, which is: */
489:
490: /*-
491: * Copyright (c) 2011 The NetBSD Foundation, Inc.
492: * All rights reserved.
493: *
494: * This code is derived from software contributed to The NetBSD Foundation
495: * by Christos Zoulas.
496: *
497: * Redistribution and use in source and binary forms, with or without
498: * modification, are permitted provided that the following conditions
499: * are met:
500: * 1. Redistributions of source code must retain the above copyright
501: * notice, this list of conditions and the following disclaimer.
502: * 2. Redistributions in binary form must reproduce the above copyright
503: * notice, this list of conditions and the following disclaimer in the
504: * documentation and/or other materials provided with the distribution.
505: *
506: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
507: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
508: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
509: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
510: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
511: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
512: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
513: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
514: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
515: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
516: * POSSIBILITY OF SUCH DAMAGE.
517: */
518: ssize_t
519: getdelim(char **buf, size_t *bufsiz, int delimiter, FILE *fp)
520: {
521: char *ptr, *eptr;
522:
523:
524: if (*buf == NULL || *bufsiz == 0) {
525: *bufsiz = BUFSIZ;
526: if ((*buf = malloc(*bufsiz)) == NULL)
527: return -1;
528: }
529:
530: for (ptr = *buf, eptr = *buf + *bufsiz;;) {
531: int c = fgetc(fp);
532: if (c == -1) {
533: if (feof(fp)) {
534: ssize_t diff = (ssize_t)(ptr - *buf);
535: if (diff != 0) {
536: *ptr = '\0';
537: return diff;
538: }
539: }
540: return -1;
541: }
542: *ptr++ = c;
543: if (c == delimiter) {
544: *ptr = '\0';
545: return ptr - *buf;
546: }
547: if (ptr + 2 >= eptr) {
548: char *nbuf;
549: size_t nbufsiz = *bufsiz * 2;
550: ssize_t d = ptr - *buf;
551: if ((nbuf = realloc(*buf, nbufsiz)) == NULL)
552: return -1;
553: *buf = nbuf;
554: *bufsiz = nbufsiz;
555: eptr = nbuf + nbufsiz;
556: ptr = nbuf + d;
557: }
558: }
559: }
560:
561: ssize_t
562: getline(char **buf, size_t *bufsiz, FILE *fp)
563: {
564: return getdelim(buf, bufsiz, '\n', fp);
565: }
566:
567: #endif
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
![[BACK]](/icons/cvsweb/back.gif){kind=icon}
Return to iperf_util.c CVS log ![[TXT]](/icons/cvsweb/text.gif){kind=icon}
![[DIR]](/icons/cvsweb/dir.gif){kind=icon}
Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / iperf / src