wpa_debug.c revision 7a53dbb56693ee9f55c0cab1a8297436511e8613 
1/*
2 * wpa_supplicant/hostapd / Debug prints
3 * Copyright (c) 2002-2013, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9#include "includes.h"
10
11#include "common.h"
12
13#ifdef CONFIG_DEBUG_SYSLOG
14#include <syslog.h>
15
16static int wpa_debug_syslog = 0;
17#endif /* CONFIG_DEBUG_SYSLOG */
18
19#ifdef CONFIG_DEBUG_LINUX_TRACING
20#include <sys/types.h>
21#include <sys/stat.h>
22#include <fcntl.h>
23#include <string.h>
24#include <stdio.h>
25
26static FILE *wpa_debug_tracing_file = NULL;
27
28#define WPAS_TRACE_PFX "wpas <%d>: "
29#endif /* CONFIG_DEBUG_LINUX_TRACING */
30
31
32int wpa_debug_level = MSG_INFO;
33int wpa_debug_show_keys = 0;
34int wpa_debug_timestamp = 0;
35
36
37#ifdef CONFIG_ANDROID_LOG
38
39#include <android/log.h>
40
41#ifndef ANDROID_LOG_NAME
42#define ANDROID_LOG_NAME	"wpa_supplicant"
43#endif /* ANDROID_LOG_NAME */
44
45static int wpa_to_android_level(int level)
46{
47	if (level == MSG_ERROR)
48		return ANDROID_LOG_ERROR;
49	if (level == MSG_WARNING)
50		return ANDROID_LOG_WARN;
51	if (level == MSG_INFO)
52		return ANDROID_LOG_INFO;
53	return ANDROID_LOG_DEBUG;
54}
55
56#endif /* CONFIG_ANDROID_LOG */
57
58#ifndef CONFIG_NO_STDOUT_DEBUG
59
60#ifdef CONFIG_DEBUG_FILE
61static FILE *out_file = NULL;
62#endif /* CONFIG_DEBUG_FILE */
63
64
65void wpa_debug_print_timestamp(void)
66{
67#ifndef CONFIG_ANDROID_LOG
68	struct os_time tv;
69
70	if (!wpa_debug_timestamp)
71		return;
72
73	os_get_time(&tv);
74#ifdef CONFIG_DEBUG_FILE
75	if (out_file) {
76		fprintf(out_file, "%ld.%06u: ", (long) tv.sec,
77			(unsigned int) tv.usec);
78	} else
79#endif /* CONFIG_DEBUG_FILE */
80	printf("%ld.%06u: ", (long) tv.sec, (unsigned int) tv.usec);
81#endif /* CONFIG_ANDROID_LOG */
82}
83
84
85#ifdef CONFIG_DEBUG_SYSLOG
86#ifndef LOG_HOSTAPD
87#define LOG_HOSTAPD LOG_DAEMON
88#endif /* LOG_HOSTAPD */
89
90void wpa_debug_open_syslog(void)
91{
92	openlog("wpa_supplicant", LOG_PID | LOG_NDELAY, LOG_HOSTAPD);
93	wpa_debug_syslog++;
94}
95
96
97void wpa_debug_close_syslog(void)
98{
99	if (wpa_debug_syslog)
100		closelog();
101}
102
103
104static int syslog_priority(int level)
105{
106	switch (level) {
107	case MSG_MSGDUMP:
108	case MSG_DEBUG:
109		return LOG_DEBUG;
110	case MSG_INFO:
111		return LOG_NOTICE;
112	case MSG_WARNING:
113		return LOG_WARNING;
114	case MSG_ERROR:
115		return LOG_ERR;
116	}
117	return LOG_INFO;
118}
119#endif /* CONFIG_DEBUG_SYSLOG */
120
121
122#ifdef CONFIG_DEBUG_LINUX_TRACING
123
124int wpa_debug_open_linux_tracing(void)
125{
126	int mounts, trace_fd;
127	char buf[4096] = {};
128	ssize_t buflen;
129	char *line, *tmp1, *path = NULL;
130
131	mounts = open("/proc/mounts", O_RDONLY);
132	if (mounts < 0) {
133		printf("no /proc/mounts\n");
134		return -1;
135	}
136
137	buflen = read(mounts, buf, sizeof(buf) - 1);
138	close(mounts);
139	if (buflen < 0) {
140		printf("failed to read /proc/mounts\n");
141		return -1;
142	}
143
144	line = strtok_r(buf, "\n", &tmp1);
145	while (line) {
146		char *tmp2, *tmp_path, *fstype;
147		/* "<dev> <mountpoint> <fs type> ..." */
148		strtok_r(line, " ", &tmp2);
149		tmp_path = strtok_r(NULL, " ", &tmp2);
150		fstype = strtok_r(NULL, " ", &tmp2);
151		if (strcmp(fstype, "debugfs") == 0) {
152			path = tmp_path;
153			break;
154		}
155
156		line = strtok_r(NULL, "\n", &tmp1);
157	}
158
159	if (path == NULL) {
160		printf("debugfs mountpoint not found\n");
161		return -1;
162	}
163
164	snprintf(buf, sizeof(buf) - 1, "%s/tracing/trace_marker", path);
165
166	trace_fd = open(buf, O_WRONLY);
167	if (trace_fd < 0) {
168		printf("failed to open trace_marker file\n");
169		return -1;
170	}
171	wpa_debug_tracing_file = fdopen(trace_fd, "w");
172	if (wpa_debug_tracing_file == NULL) {
173		close(trace_fd);
174		printf("failed to fdopen()\n");
175		return -1;
176	}
177
178	return 0;
179}
180
181
182void wpa_debug_close_linux_tracing(void)
183{
184	if (wpa_debug_tracing_file == NULL)
185		return;
186	fclose(wpa_debug_tracing_file);
187	wpa_debug_tracing_file = NULL;
188}
189
190#endif /* CONFIG_DEBUG_LINUX_TRACING */
191
192
193/**
194 * wpa_printf - conditional printf
195 * @level: priority level (MSG_*) of the message
196 * @fmt: printf format string, followed by optional arguments
197 *
198 * This function is used to print conditional debugging and error messages. The
199 * output may be directed to stdout, stderr, and/or syslog based on
200 * configuration.
201 *
202 * Note: New line '\n' is added to the end of the text when printing to stdout.
203 */
204void wpa_printf(int level, const char *fmt, ...)
205{
206	va_list ap;
207
208	va_start(ap, fmt);
209	if (level >= wpa_debug_level) {
210#ifdef CONFIG_ANDROID_LOG
211		__android_log_vprint(wpa_to_android_level(level),
212				     ANDROID_LOG_NAME, fmt, ap);
213#else /* CONFIG_ANDROID_LOG */
214#ifdef CONFIG_DEBUG_SYSLOG
215		if (wpa_debug_syslog) {
216			vsyslog(syslog_priority(level), fmt, ap);
217		} else {
218#endif /* CONFIG_DEBUG_SYSLOG */
219		wpa_debug_print_timestamp();
220#ifdef CONFIG_DEBUG_FILE
221		if (out_file) {
222			vfprintf(out_file, fmt, ap);
223			fprintf(out_file, "\n");
224		} else {
225#endif /* CONFIG_DEBUG_FILE */
226		vprintf(fmt, ap);
227		printf("\n");
228#ifdef CONFIG_DEBUG_FILE
229		}
230#endif /* CONFIG_DEBUG_FILE */
231#ifdef CONFIG_DEBUG_SYSLOG
232		}
233#endif /* CONFIG_DEBUG_SYSLOG */
234#endif /* CONFIG_ANDROID_LOG */
235	}
236	va_end(ap);
237
238#ifdef CONFIG_DEBUG_LINUX_TRACING
239	if (wpa_debug_tracing_file != NULL) {
240		va_start(ap, fmt);
241		fprintf(wpa_debug_tracing_file, WPAS_TRACE_PFX, level);
242		vfprintf(wpa_debug_tracing_file, fmt, ap);
243		fprintf(wpa_debug_tracing_file, "\n");
244		fflush(wpa_debug_tracing_file);
245		va_end(ap);
246	}
247#endif /* CONFIG_DEBUG_LINUX_TRACING */
248}
249
250
251static void _wpa_hexdump(int level, const char *title, const u8 *buf,
252			 size_t len, int show)
253{
254	size_t i;
255
256#ifdef CONFIG_DEBUG_LINUX_TRACING
257	if (wpa_debug_tracing_file != NULL) {
258		fprintf(wpa_debug_tracing_file,
259			WPAS_TRACE_PFX "%s - hexdump(len=%lu):",
260			level, title, (unsigned long) len);
261		if (buf == NULL) {
262			fprintf(wpa_debug_tracing_file, " [NULL]\n");
263		} else if (!show) {
264			fprintf(wpa_debug_tracing_file, " [REMOVED]\n");
265		} else {
266			for (i = 0; i < len; i++)
267				fprintf(wpa_debug_tracing_file,
268					" %02x", buf[i]);
269		}
270		fflush(wpa_debug_tracing_file);
271	}
272#endif /* CONFIG_DEBUG_LINUX_TRACING */
273
274	if (level < wpa_debug_level)
275		return;
276#ifdef CONFIG_ANDROID_LOG
277	{
278		const char *display;
279		char *strbuf = NULL;
280		size_t slen = len;
281		if (buf == NULL) {
282			display = " [NULL]";
283		} else if (len == 0) {
284			display = "";
285		} else if (show && len) {
286			/* Limit debug message length for Android log */
287			if (slen > 32)
288				slen = 32;
289			strbuf = os_malloc(1 + 3 * slen);
290			if (strbuf == NULL) {
291				wpa_printf(MSG_ERROR, "wpa_hexdump: Failed to "
292					   "allocate message buffer");
293				return;
294			}
295
296			for (i = 0; i < slen; i++)
297				os_snprintf(&strbuf[i * 3], 4, " %02x",
298					    buf[i]);
299
300			display = strbuf;
301		} else {
302			display = " [REMOVED]";
303		}
304
305		__android_log_print(wpa_to_android_level(level),
306				    ANDROID_LOG_NAME,
307				    "%s - hexdump(len=%lu):%s%s",
308				    title, (long unsigned int) len, display,
309				    len > slen ? " ..." : "");
310		os_free(strbuf);
311		return;
312	}
313#else /* CONFIG_ANDROID_LOG */
314#ifdef CONFIG_DEBUG_SYSLOG
315	if (wpa_debug_syslog) {
316		const char *display;
317		char *strbuf = NULL;
318
319		if (buf == NULL) {
320			display = " [NULL]";
321		} else if (len == 0) {
322			display = "";
323		} else if (show && len) {
324			strbuf = os_malloc(1 + 3 * len);
325			if (strbuf == NULL) {
326				wpa_printf(MSG_ERROR, "wpa_hexdump: Failed to "
327					   "allocate message buffer");
328				return;
329			}
330
331			for (i = 0; i < len; i++)
332				os_snprintf(&strbuf[i * 3], 4, " %02x",
333					    buf[i]);
334
335			display = strbuf;
336		} else {
337			display = " [REMOVED]";
338		}
339
340		syslog(syslog_priority(level), "%s - hexdump(len=%lu):%s",
341		       title, (unsigned long) len, display);
342		os_free(strbuf);
343		return;
344	}
345#endif /* CONFIG_DEBUG_SYSLOG */
346	wpa_debug_print_timestamp();
347#ifdef CONFIG_DEBUG_FILE
348	if (out_file) {
349		fprintf(out_file, "%s - hexdump(len=%lu):",
350			title, (unsigned long) len);
351		if (buf == NULL) {
352			fprintf(out_file, " [NULL]");
353		} else if (show) {
354			for (i = 0; i < len; i++)
355				fprintf(out_file, " %02x", buf[i]);
356		} else {
357			fprintf(out_file, " [REMOVED]");
358		}
359		fprintf(out_file, "\n");
360	} else {
361#endif /* CONFIG_DEBUG_FILE */
362	printf("%s - hexdump(len=%lu):", title, (unsigned long) len);
363	if (buf == NULL) {
364		printf(" [NULL]");
365	} else if (show) {
366		for (i = 0; i < len; i++)
367			printf(" %02x", buf[i]);
368	} else {
369		printf(" [REMOVED]");
370	}
371	printf("\n");
372#ifdef CONFIG_DEBUG_FILE
373	}
374#endif /* CONFIG_DEBUG_FILE */
375#endif /* CONFIG_ANDROID_LOG */
376}
377
378void wpa_hexdump(int level, const char *title, const void *buf, size_t len)
379{
380	_wpa_hexdump(level, title, buf, len, 1);
381}
382
383
384void wpa_hexdump_key(int level, const char *title, const void *buf, size_t len)
385{
386	_wpa_hexdump(level, title, buf, len, wpa_debug_show_keys);
387}
388
389
390static void _wpa_hexdump_ascii(int level, const char *title, const void *buf,
391			       size_t len, int show)
392{
393	size_t i, llen;
394	const u8 *pos = buf;
395	const size_t line_len = 16;
396
397#ifdef CONFIG_DEBUG_LINUX_TRACING
398	if (wpa_debug_tracing_file != NULL) {
399		fprintf(wpa_debug_tracing_file,
400			WPAS_TRACE_PFX "%s - hexdump_ascii(len=%lu):",
401			level, title, (unsigned long) len);
402		if (buf == NULL) {
403			fprintf(wpa_debug_tracing_file, " [NULL]\n");
404		} else if (!show) {
405			fprintf(wpa_debug_tracing_file, " [REMOVED]\n");
406		} else {
407			/* can do ascii processing in userspace */
408			for (i = 0; i < len; i++)
409				fprintf(wpa_debug_tracing_file,
410					" %02x", pos[i]);
411		}
412		fflush(wpa_debug_tracing_file);
413	}
414#endif /* CONFIG_DEBUG_LINUX_TRACING */
415
416	if (level < wpa_debug_level)
417		return;
418#ifdef CONFIG_ANDROID_LOG
419	_wpa_hexdump(level, title, buf, len, show);
420#else /* CONFIG_ANDROID_LOG */
421	wpa_debug_print_timestamp();
422#ifdef CONFIG_DEBUG_FILE
423	if (out_file) {
424		if (!show) {
425			fprintf(out_file,
426				"%s - hexdump_ascii(len=%lu): [REMOVED]\n",
427				title, (unsigned long) len);
428			return;
429		}
430		if (buf == NULL) {
431			fprintf(out_file,
432				"%s - hexdump_ascii(len=%lu): [NULL]\n",
433				title, (unsigned long) len);
434			return;
435		}
436		fprintf(out_file, "%s - hexdump_ascii(len=%lu):\n",
437			title, (unsigned long) len);
438		while (len) {
439			llen = len > line_len ? line_len : len;
440			fprintf(out_file, "    ");
441			for (i = 0; i < llen; i++)
442				fprintf(out_file, " %02x", pos[i]);
443			for (i = llen; i < line_len; i++)
444				fprintf(out_file, "   ");
445			fprintf(out_file, "   ");
446			for (i = 0; i < llen; i++) {
447				if (isprint(pos[i]))
448					fprintf(out_file, "%c", pos[i]);
449				else
450					fprintf(out_file, "_");
451			}
452			for (i = llen; i < line_len; i++)
453				fprintf(out_file, " ");
454			fprintf(out_file, "\n");
455			pos += llen;
456			len -= llen;
457		}
458	} else {
459#endif /* CONFIG_DEBUG_FILE */
460	if (!show) {
461		printf("%s - hexdump_ascii(len=%lu): [REMOVED]\n",
462		       title, (unsigned long) len);
463		return;
464	}
465	if (buf == NULL) {
466		printf("%s - hexdump_ascii(len=%lu): [NULL]\n",
467		       title, (unsigned long) len);
468		return;
469	}
470	printf("%s - hexdump_ascii(len=%lu):\n", title, (unsigned long) len);
471	while (len) {
472		llen = len > line_len ? line_len : len;
473		printf("    ");
474		for (i = 0; i < llen; i++)
475			printf(" %02x", pos[i]);
476		for (i = llen; i < line_len; i++)
477			printf("   ");
478		printf("   ");
479		for (i = 0; i < llen; i++) {
480			if (isprint(pos[i]))
481				printf("%c", pos[i]);
482			else
483				printf("_");
484		}
485		for (i = llen; i < line_len; i++)
486			printf(" ");
487		printf("\n");
488		pos += llen;
489		len -= llen;
490	}
491#ifdef CONFIG_DEBUG_FILE
492	}
493#endif /* CONFIG_DEBUG_FILE */
494#endif /* CONFIG_ANDROID_LOG */
495}
496
497
498void wpa_hexdump_ascii(int level, const char *title, const void *buf,
499		       size_t len)
500{
501	_wpa_hexdump_ascii(level, title, buf, len, 1);
502}
503
504
505void wpa_hexdump_ascii_key(int level, const char *title, const void *buf,
506			   size_t len)
507{
508	_wpa_hexdump_ascii(level, title, buf, len, wpa_debug_show_keys);
509}
510
511
512#ifdef CONFIG_DEBUG_FILE
513static char *last_path = NULL;
514#endif /* CONFIG_DEBUG_FILE */
515
516int wpa_debug_reopen_file(void)
517{
518#ifdef CONFIG_DEBUG_FILE
519	int rv;
520	if (last_path) {
521		char *tmp = os_strdup(last_path);
522		wpa_debug_close_file();
523		rv = wpa_debug_open_file(tmp);
524		os_free(tmp);
525	} else {
526		wpa_printf(MSG_ERROR, "Last-path was not set, cannot "
527			   "re-open log file.");
528		rv = -1;
529	}
530	return rv;
531#else /* CONFIG_DEBUG_FILE */
532	return 0;
533#endif /* CONFIG_DEBUG_FILE */
534}
535
536
537int wpa_debug_open_file(const char *path)
538{
539#ifdef CONFIG_DEBUG_FILE
540	if (!path)
541		return 0;
542
543	if (last_path == NULL || os_strcmp(last_path, path) != 0) {
544		/* Save our path to enable re-open */
545		os_free(last_path);
546		last_path = os_strdup(path);
547	}
548
549	out_file = fopen(path, "a");
550	if (out_file == NULL) {
551		wpa_printf(MSG_ERROR, "wpa_debug_open_file: Failed to open "
552			   "output file, using standard output");
553		return -1;
554	}
555#ifndef _WIN32
556	setvbuf(out_file, NULL, _IOLBF, 0);
557#endif /* _WIN32 */
558#else /* CONFIG_DEBUG_FILE */
559	(void)path;
560#endif /* CONFIG_DEBUG_FILE */
561	return 0;
562}
563
564
565void wpa_debug_close_file(void)
566{
567#ifdef CONFIG_DEBUG_FILE
568	if (!out_file)
569		return;
570	fclose(out_file);
571	out_file = NULL;
572	os_free(last_path);
573	last_path = NULL;
574#endif /* CONFIG_DEBUG_FILE */
575}
576
577
578void wpa_debug_setup_stdout(void)
579{
580#ifndef _WIN32
581	setvbuf(stdout, NULL, _IOLBF, 0);
582#endif /* _WIN32 */
583}
584
585#endif /* CONFIG_NO_STDOUT_DEBUG */
586
587
588#ifndef CONFIG_NO_WPA_MSG
589static wpa_msg_cb_func wpa_msg_cb = NULL;
590
591void wpa_msg_register_cb(wpa_msg_cb_func func)
592{
593	wpa_msg_cb = func;
594}
595
596
597static wpa_msg_get_ifname_func wpa_msg_ifname_cb = NULL;
598
599void wpa_msg_register_ifname_cb(wpa_msg_get_ifname_func func)
600{
601	wpa_msg_ifname_cb = func;
602}
603
604
605void wpa_msg(void *ctx, int level, const char *fmt, ...)
606{
607	va_list ap;
608	char *buf;
609	int buflen;
610	int len;
611	char prefix[130];
612
613	va_start(ap, fmt);
614	buflen = vsnprintf(NULL, 0, fmt, ap) + 1;
615	va_end(ap);
616
617	buf = os_malloc(buflen);
618	if (buf == NULL) {
619		wpa_printf(MSG_ERROR, "wpa_msg: Failed to allocate message "
620			   "buffer");
621		return;
622	}
623	va_start(ap, fmt);
624	prefix[0] = '\0';
625	if (wpa_msg_ifname_cb) {
626		const char *ifname = wpa_msg_ifname_cb(ctx);
627		if (ifname) {
628			int res = os_snprintf(prefix, sizeof(prefix), "%s: ",
629					      ifname);
630			if (os_snprintf_error(sizeof(prefix), res))
631				prefix[0] = '\0';
632		}
633	}
634	len = vsnprintf(buf, buflen, fmt, ap);
635	va_end(ap);
636	wpa_printf(level, "%s%s", prefix, buf);
637	if (wpa_msg_cb)
638		wpa_msg_cb(ctx, level, WPA_MSG_PER_INTERFACE, buf, len);
639	os_free(buf);
640}
641
642
643void wpa_msg_ctrl(void *ctx, int level, const char *fmt, ...)
644{
645	va_list ap;
646	char *buf;
647	int buflen;
648	int len;
649
650	if (!wpa_msg_cb)
651		return;
652
653	va_start(ap, fmt);
654	buflen = vsnprintf(NULL, 0, fmt, ap) + 1;
655	va_end(ap);
656
657	buf = os_malloc(buflen);
658	if (buf == NULL) {
659		wpa_printf(MSG_ERROR, "wpa_msg_ctrl: Failed to allocate "
660			   "message buffer");
661		return;
662	}
663	va_start(ap, fmt);
664	len = vsnprintf(buf, buflen, fmt, ap);
665	va_end(ap);
666	wpa_msg_cb(ctx, level, WPA_MSG_PER_INTERFACE, buf, len);
667	os_free(buf);
668}
669
670
671void wpa_msg_global(void *ctx, int level, const char *fmt, ...)
672{
673	va_list ap;
674	char *buf;
675	int buflen;
676	int len;
677
678	va_start(ap, fmt);
679	buflen = vsnprintf(NULL, 0, fmt, ap) + 1;
680	va_end(ap);
681
682	buf = os_malloc(buflen);
683	if (buf == NULL) {
684		wpa_printf(MSG_ERROR, "wpa_msg_global: Failed to allocate "
685			   "message buffer");
686		return;
687	}
688	va_start(ap, fmt);
689	len = vsnprintf(buf, buflen, fmt, ap);
690	va_end(ap);
691	wpa_printf(level, "%s", buf);
692	if (wpa_msg_cb)
693		wpa_msg_cb(ctx, level, WPA_MSG_GLOBAL, buf, len);
694	os_free(buf);
695}
696
697
698void wpa_msg_global_ctrl(void *ctx, int level, const char *fmt, ...)
699{
700	va_list ap;
701	char *buf;
702	int buflen;
703	int len;
704
705	if (!wpa_msg_cb)
706		return;
707
708	va_start(ap, fmt);
709	buflen = vsnprintf(NULL, 0, fmt, ap) + 1;
710	va_end(ap);
711
712	buf = os_malloc(buflen);
713	if (buf == NULL) {
714		wpa_printf(MSG_ERROR,
715			   "wpa_msg_global_ctrl: Failed to allocate message buffer");
716		return;
717	}
718	va_start(ap, fmt);
719	len = vsnprintf(buf, buflen, fmt, ap);
720	va_end(ap);
721	wpa_msg_cb(ctx, level, WPA_MSG_GLOBAL, buf, len);
722	os_free(buf);
723}
724
725
726void wpa_msg_no_global(void *ctx, int level, const char *fmt, ...)
727{
728	va_list ap;
729	char *buf;
730	int buflen;
731	int len;
732
733	va_start(ap, fmt);
734	buflen = vsnprintf(NULL, 0, fmt, ap) + 1;
735	va_end(ap);
736
737	buf = os_malloc(buflen);
738	if (buf == NULL) {
739		wpa_printf(MSG_ERROR, "wpa_msg_no_global: Failed to allocate "
740			   "message buffer");
741		return;
742	}
743	va_start(ap, fmt);
744	len = vsnprintf(buf, buflen, fmt, ap);
745	va_end(ap);
746	wpa_printf(level, "%s", buf);
747	if (wpa_msg_cb)
748		wpa_msg_cb(ctx, level, WPA_MSG_NO_GLOBAL, buf, len);
749	os_free(buf);
750}
751
752#endif /* CONFIG_NO_WPA_MSG */
753
754
755#ifndef CONFIG_NO_HOSTAPD_LOGGER
756static hostapd_logger_cb_func hostapd_logger_cb = NULL;
757
758void hostapd_logger_register_cb(hostapd_logger_cb_func func)
759{
760	hostapd_logger_cb = func;
761}
762
763
764void hostapd_logger(void *ctx, const u8 *addr, unsigned int module, int level,
765		    const char *fmt, ...)
766{
767	va_list ap;
768	char *buf;
769	int buflen;
770	int len;
771
772	va_start(ap, fmt);
773	buflen = vsnprintf(NULL, 0, fmt, ap) + 1;
774	va_end(ap);
775
776	buf = os_malloc(buflen);
777	if (buf == NULL) {
778		wpa_printf(MSG_ERROR, "hostapd_logger: Failed to allocate "
779			   "message buffer");
780		return;
781	}
782	va_start(ap, fmt);
783	len = vsnprintf(buf, buflen, fmt, ap);
784	va_end(ap);
785	if (hostapd_logger_cb)
786		hostapd_logger_cb(ctx, addr, module, level, buf, len);
787	else if (addr)
788		wpa_printf(MSG_DEBUG, "hostapd_logger: STA " MACSTR " - %s",
789			   MAC2STR(addr), buf);
790	else
791		wpa_printf(MSG_DEBUG, "hostapd_logger: %s", buf);
792	os_free(buf);
793}
794#endif /* CONFIG_NO_HOSTAPD_LOGGER */
795