Add support for wpa_supplicant syslog output

Enable for build: CFLAGS += -DCONFIG_DEBUG_SYSLOG in .config
Enable at runtime: -s on command line

src/utils/wpa_debug.c

@@ -16,6 +16,12 @@
 
 #include "common.h"
 
+#ifdef CONFIG_DEBUG_SYSLOG
+#include <syslog.h>
+
+static int wpa_debug_syslog = 0;
+#endif /* CONFIG_DEBUG_SYSLOG */
+
 
 #ifdef CONFIG_DEBUG_FILE
 static FILE *out_file = NULL;
@@ -45,6 +51,39 @@ void wpa_debug_print_timestamp(void)
 }
 
 
+#ifdef CONFIG_DEBUG_SYSLOG
+void wpa_debug_open_syslog(void)
+{
+	openlog("wpa_supplicant", LOG_PID | LOG_NDELAY, LOG_DAEMON);
+	wpa_debug_syslog++;
+}
+
+
+void wpa_debug_close_syslog(void)
+{
+	if (wpa_debug_syslog)
+		closelog();
+}
+
+
+static int syslog_priority(int level)
+{
+	switch (level) {
+	case MSG_MSGDUMP:
+	case MSG_DEBUG:
+		return LOG_DEBUG;
+	case MSG_INFO:
+		return LOG_NOTICE;
+	case MSG_WARNING:
+		return LOG_WARNING;
+	case MSG_ERROR:
+		return LOG_ERR;
+	}
+	return LOG_INFO;
+}
+#endif /* CONFIG_DEBUG_SYSLOG */
+
+
 /**
  * wpa_printf - conditional printf
  * @level: priority level (MSG_*) of the message
@@ -62,6 +101,11 @@ void wpa_printf(int level, char *fmt, ...)
 
 	va_start(ap, fmt);
 	if (level >= wpa_debug_level) {
+#ifdef CONFIG_DEBUG_SYSLOG
+		if (wpa_debug_syslog) {
+			vsyslog(syslog_priority(level), fmt, ap);
+		} else {
+#endif /* CONFIG_DEBUG_SYSLOG */
 		wpa_debug_print_timestamp();
 #ifdef CONFIG_DEBUG_FILE
 		if (out_file) {
@@ -74,6 +118,9 @@ void wpa_printf(int level, char *fmt, ...)
 #ifdef CONFIG_DEBUG_FILE
 		}
 #endif /* CONFIG_DEBUG_FILE */
+#ifdef CONFIG_DEBUG_SYSLOG
+		}
+#endif /* CONFIG_DEBUG_SYSLOG */
 	}
 	va_end(ap);
 }

src/utils/wpa_debug.h

@@ -205,6 +205,23 @@ enum hostapd_logger_level {
 };
 
 
+#ifdef CONFIG_DEBUG_SYSLOG
+
+void wpa_debug_open_syslog(void);
+void wpa_debug_close_syslog(void);
+
+#else /* CONFIG_DEBUG_SYSLOG */
+
+static inline void wpa_debug_open_syslog(void)
+{
+}
+
+static inline void wpa_debug_close_syslog(void)
+{
+}
+
+#endif /* CONFIG_DEBUG_SYSLOG */
+
 
 #ifdef EAPOL_TEST
 #define WPA_ASSERT(a)						       \

wpa_supplicant/main.c

@@ -26,7 +26,7 @@ static void usage(void)
 	int i;
 	printf("%s\n\n%s\n"
 	       "usage:\n"
-	       "  wpa_supplicant [-BddhKLqqtuvW] [-P<pid file>] "
+	       "  wpa_supplicant [-BddhKLqqstuvW] [-P<pid file>] "
 	       "[-g<global ctrl>] \\\n"
 	       "        -i<ifname> -c<config file> [-C<ctrl>] [-D<driver>] "
 	       "[-p<driver_param>] \\\n"
@@ -57,8 +57,11 @@ static void usage(void)
 	printf("  -f = log output to debug file instead of stdout\n");
 #endif /* CONFIG_DEBUG_FILE */
 	printf("  -g = global ctrl_interface\n"
-	       "  -K = include keys (passwords, etc.) in debug output\n"
-	       "  -t = include timestamp in debug messages\n"
+	       "  -K = include keys (passwords, etc.) in debug output\n");
+#ifdef CONFIG_DEBUG_SYSLOG
+	printf("  -s = log output to syslog instead of stdout\n");
+#endif /* CONFIG_DEBUG_SYSLOG */
+	printf("  -t = include timestamp in debug messages\n"
 	       "  -h = show this help text\n"
 	       "  -L = show license (GPL and BSD)\n"
 	       "  -p = driver parameters\n"
@@ -72,7 +75,9 @@ static void usage(void)
 	       "  -N = start describing new interface\n");
 
 	printf("example:\n"
-	       "  wpa_supplicant -Dwext -iwlan0 -c/etc/wpa_supplicant.conf\n");
+	       "  wpa_supplicant -D%s -iwlan0 -c/etc/wpa_supplicant.conf\n",
+	       wpa_supplicant_drivers[i] ?
+		   wpa_supplicant_drivers[i]->name : "wext");
 #endif /* CONFIG_NO_STDOUT_DEBUG */
 }
 
@@ -133,7 +138,7 @@ int main(int argc, char *argv[])
 	wpa_supplicant_fd_workaround();
 
 	for (;;) {
-		c = getopt(argc, argv, "b:Bc:C:D:df:g:hi:KLNp:P:qtuvW");
+		c = getopt(argc, argv, "b:Bc:C:D:df:g:hi:KLNp:P:qstuvW");
 		if (c < 0)
 			break;
 		switch (c) {
@@ -194,6 +199,11 @@ int main(int argc, char *argv[])
 		case 'q':
 			params.wpa_debug_level++;
 			break;
+#ifdef CONFIG_DEBUG_SYSLOG
+		case 's':
+			params.wpa_debug_syslog++;
+			break;
+#endif /* CONFIG_DEBUG_SYSLOG */
 		case 't':
 			params.wpa_debug_timestamp++;
 			break;

wpa_supplicant/wpa_supplicant.c

@@ -2074,6 +2074,8 @@ struct wpa_global * wpa_supplicant_init(struct wpa_params *params)
 		return NULL;
 
 	wpa_debug_open_file(params->wpa_debug_file_path);
+	if (params->wpa_debug_syslog)
+		wpa_debug_open_syslog();
 
 	ret = eap_peer_register_methods();
 	if (ret) {
@@ -2224,5 +2226,6 @@ void wpa_supplicant_deinit(struct wpa_global *global)
 	os_free(global->params.ctrl_interface);
 
 	os_free(global);
+	wpa_debug_close_syslog();
 	wpa_debug_close_file();
 }

wpa_supplicant/wpa_supplicant_i.h

@@ -157,6 +157,11 @@ struct wpa_params {
 	 * wpa_debug_file_path - Path of debug file or %NULL to use stdout
 	 */
 	const char *wpa_debug_file_path;
+
+	/**
+	 * wpa_debug_syslog - Enable log output through syslog
+	 */
+	int wpa_debug_syslog;
 };
 
 /**