log: allow setting loglevel

Signed-off-by: David Bauer <mail@david-bauer.net>

openwrt/node-whisperer/files/node-whisperer.init

@@ -50,10 +50,12 @@ start_service()
 {
 	ENABLED="$(uci -q get node-whisperer.settings.enabled)"
 	ENABLED="${ENABLED:-1}"
+	LOG_LEVEL="$(uci -q get node-whisperer.settings.log_level)"
+	LOG_LEVEL="${LOG_LEVEL:-3}"
 
 	[ "$ENABLED" -gt 0 ] || return
 
 	procd_open_instance
-	procd_set_param command "$PROG"
+	procd_set_param command "$PROG -s -l $LOG_LEVEL"
 	procd_close_instance
 }

openwrt/node-whisperer/files/node-whisperer.uci

@@ -1,6 +1,7 @@
 
 config node-whisperer 'core'
 	option enabled '1'
+	option loglevel '3'
 	list information 'node_id'
 	list information 'hostname'
 	list information 'uptime'

src/daemon.c

@@ -160,6 +160,22 @@ static int start_daemon() {
 }
 
 int main(int argc, char *argv[]) {
+	int opt;
+
+	while ((opt = getopt(argc, argv, "l:s")) != -1) {
+		switch (opt) {
+		case 'l':
+			log_set_level(atoi(optarg));
+			break;
+		case 's':
+			log_use_syslog(1);
+			break;
+		default:
+			fprintf(stderr, "Usage: %s [-l loglevel] [-s]\n", argv[0]);
+			exit(EXIT_FAILURE);
+		}
+	}
+
 	start_daemon();
 	return 0;
 }

src/log.c

@@ -1,13 +1,15 @@
 #include <stdarg.h>
 #include <stdio.h>
+#include <syslog.h>
 #include "log.h"
 
-static enum log_level log_level = LOG_INFO;
+static enum log_level log_level = LL_INFO;
+static int use_syslog = 0;
 
 static void log_vprintf(enum log_level level, const char *fmt, va_list args) {
 	const char *level_str;
 
-	if (level < log_level) {
+	if (level > log_level) {
 		return;
 	}
 
@@ -28,12 +30,20 @@ static void log_vprintf(enum log_level level, const char *fmt, va_list args) {
 	fprintf(stderr, "[%s] ", level_str);
 	vfprintf(stderr, fmt, args);
 	fprintf(stderr, "\n");
+
+	if (use_syslog) {
+		vsyslog(LOG_INFO, fmt, args);
+	}
 }
 
 void log_set_level(enum log_level level) {
 	log_level = level;
 }
 
+void log_use_syslog(int use) {
+	use_syslog = use;
+}
+
 void log_error(const char *fmt, ...) {
 	va_list args;
 	va_start(args, fmt);

src/log.h

@@ -1,14 +1,15 @@
 #pragma once
 
 enum log_level {
-    LOG_DEBUG,
-    LOG_INFO,
-    LOG_WARNING,
-    LOG_ERROR,
-    LOG_FATAL
+    LL_DEBUG = 5,
+    LL_INFO = 4,
+    LL_WARNING = 3,
+    LOG_ERROR = 2,
+    LOG_FATAL = 1,
 };
 
 void log_set_level(enum log_level level);
+void log_use_syslog(int use);
 
 void log_error(const char *fmt, ...);
 void log_info(const char *fmt, ...);