new configfile.[ch] & logging.[ch]

configfile.c

@@ -28,59 +28,130 @@
 #include <arpa/inet.h>
 
 #include "configfile.h"
-#include "helper.h"
 #include "list.h"
 #include "logging.h"
 
+#define BUFSIZE 1024
+
+struct conf_section {
+	struct list_head list;
+	struct list_head tupel_list;
+	const char *name;
+};
+
+struct conf_tupel {
+	struct list_head list;
+	const char *option;
+	const char *parameter;
+};
+
 static LIST_HEAD(config_list);
 
-static struct conf_section * config_add_section(char *name)
+static struct conf_section * config_add_section(const char *name)
 {
 	struct conf_section *section;
-
+	section = malloc(sizeof(struct conf_section) + strlen(name));
-	if (!name)
+	if (section == NULL)
 		return NULL;
 
-	section = malloc(sizeof(struct conf_section));
-	if (section) {
 	INIT_LIST_HEAD(&section->list);
-		INIT_LIST_HEAD(&section->tupel);
+	INIT_LIST_HEAD(&section->tupel_list);
 
-		strncpy(section->name, name, sizeof(section->name));
+	section->name = strdup(name);
-		list_add_tail(&section->list, &config_list);
+	if (section->name == NULL) {
+		free(section);
+		return NULL;
 	}
+
+	list_add_tail(&section->list, &config_list);
 	return section;
 }
 
-static int config_add_tupel(struct conf_section *section, char *option, char *parameter)
+static int config_add_tupel(struct conf_section *section, const char *option, const char *parameter)
 {
-	struct conf_tupel *tupel;
+	struct conf_tupel *tupel = malloc(sizeof(struct conf_tupel));
-
+	if (tupel == NULL)
-	if (!section || !option || !parameter)
+		return -1;
-		return 0;
-
-	if (!(tupel = malloc(sizeof(struct conf_tupel))))
-		return 0;
 
 	INIT_LIST_HEAD(&tupel->list);
-
 	tupel->option = strdup(option);
 	tupel->parameter = strdup(parameter);
 
-	list_add_tail(&tupel->list, &section->tupel);
+	if (tupel->option == NULL || tupel->parameter == NULL) {
-	return 1;
+		free(tupel);
+		return -1;
+	}
+
+	list_add_tail(&tupel->list, &section->tupel_list);
+	return 0;
 }
 
-static void config_free(void)
+int config_parse(const char *config)
+{
+	FILE *fz = fopen(config, "r");
+	if (fz == NULL) {
+		log_print(LOG_ERROR, "config_parse(): %s", config);
+		return -1;
+	}
+
+	char *line = malloc(BUFSIZE);
+	if (line == NULL) {
+		log_print(LOG_ERROR, "config_parse(): out of memory");
+		fclose(fz);
+		return -1;
+	}
+
+	int linenum = 0;
+	struct conf_section *section = NULL;
+	while (fgets(line, BUFSIZE, fz) != NULL) {
+		linenum++;
+
+		if (line[0] == '#' || line[0] <= ' ') {
+			continue;
+
+		} else if (line[0] == '[') {
+			char *tok = strtok(line +1, " ]\n");
+
+			if (tok == NULL || (section = config_add_section(tok)) == NULL) {
+				log_print(LOG_WARN, "config_parse(): invalid section in row %d", linenum);
+				free(line);
+				fclose(fz);
+				return -1;
+			}
+			continue;
+
+		} else if (section == NULL) {
+			log_print(LOG_WARN, "config_parse(): missing section in row %d", linenum);
+			free(line);
+			fclose(fz);
+			return -1;
+		}
+
+		char *tok = strtok(line, " \n");
+		if (tok != NULL) {
+			char *tok2;
+			while ((tok2 = strtok(NULL, " \n"))) {
+				if (config_add_tupel(section, tok, tok2) != 0)
+					log_print(LOG_WARN, "config_parse(): invalid row %d", linenum);
+			}
+		}
+	}
+
+	fclose(fz);
+	free(line);
+	return 0;
+}
+
+void config_free(void)
 {
 	struct conf_section *section, *section_tmp;
 	struct conf_tupel *tupel, *tupel_tmp;
 
 	list_for_each_entry_safe(section, section_tmp, &config_list, list) {
-		list_for_each_entry_safe(tupel, tupel_tmp, &section->tupel, list) {
+		list_for_each_entry_safe(tupel, tupel_tmp, &section->tupel_list, list) {
 			list_del(&tupel->list);
-			free(tupel->option);
+			free((char *)tupel->option);
-			free(tupel->parameter);
+			free((char *)tupel->parameter);
 			free(tupel);
 		}
 		list_del(&section->list);
@@ -88,66 +159,7 @@ static void config_free(void)
 	}
 }
 
-int config_parse(char *config)
+static struct conf_section * config_get_section(const char *name)
-{
-	struct conf_section *section = NULL;
-	FILE *fz;
-	int i = 0, ret = 1;
-	char *row, *tok, *tok2;
-
-	if (!config)
-		return 0;
-
-	if (!(row = malloc(1024)))
-		return 0;
-
-	if (!(fz = fopen(config, "r"))) {
-		log_print(LOG_ERROR, "config_parse(): %s", config);
-		return 0;
-	}
-
-	while (fgets(row, 1024, fz)) {
-		i++;
-
-		if (row[0] == '#' || row[0] <= ' ') {
-			continue;
-
-		} else if (row[0] == '[') {
-			tok = strtok(row +1, " ]\n");
-			section = config_add_section(tok);
-			if (!section) {
-				log_print(LOG_WARN, "config_parse(): invalid section in row %d", i);
-				ret = 0;
-				break;
-			}
-			continue;
-
-		} else if (!section) {
-			log_print(LOG_WARN, "config_parse(): missing section in row %d", i);
-			ret = 0;
-			break;
-		}
-
-		if ((tok = strtok(row, " \n"))) {
-			while ((tok2 = strtok(NULL, " \n"))) {
-				if (!config_add_tupel(section, tok, tok2))
-					log_print(LOG_WARN, "config_parse(): invalid row %d", i);
-			}
-		}
-	}
-
-	fclose(fz);
-	free(row);
-
-	if (atexit(config_free) != 0) {
-		log_print(LOG_ERROR, "config_parse(): atexit()");
-		return 0;
-	}
-
-	return ret;
-}
-
-struct conf_section * config_get_section(char *name)
 {
 	struct conf_section *section;
 
@@ -158,51 +170,48 @@ struct conf_section * config_get_section(char *name)
 	return NULL;
 }
 
-char * config_get_parameter(struct conf_section *section, char *option)
+const char * config_get_string(const char *section_str, const char *option, const char *def)
 {
+	struct conf_section *section = config_get_section(section_str);
+	if (section != NULL) {
 		struct conf_tupel *tupel;
-
+		list_for_each_entry(tupel, &section->tupel_list, list) {
-	list_for_each_entry(tupel, &section->tupel, list) {
 			if (!strcmp(tupel->option, option))
 				return tupel->parameter;
 		}
-	return NULL;
+	}
-}
-
-char * config_get_string(char *section, char *option, char *def)
-{
-	struct conf_section *tmp;
-	char *ret;
-
-	tmp = config_get_section(section);
-	if (tmp && (ret = config_get_parameter(tmp, option)))
-		return ret;
 
+	if (def != NULL)
+		log_print(LOG_WARN, "config [%s:%s] not found, using default: '%s'",
+			section_str, option, def);
 	return def;
 }
 
-int config_get_int(char *section, char *option, int def)
+int config_get_int(const char *section, const char *option, int def)
 {
-	char *ret;
+	const char *ret = config_get_string(section, option, NULL);
-
+	if (ret == NULL) {
-	ret = config_get_string(section, option, NULL);
+		log_print(LOG_WARN, "config [%s:%s] not found, using default: '%d'",
-	return ret ? atoi(ret) : def;
+			section, option, def);
+		return def;
+	}
+	return atoi(ret);
 }
 
-int config_get_saddr(char *section, char *option, struct sockaddr_in *sa)
+int config_get_strings(const char *section_str, const char *option,
+			int (*callback)(const char *value, void *privdata),
+			void *privdata)
 {
-	char *ret, *part[2];
+	struct conf_section *section = config_get_section(section_str);
-
+	if (section == NULL)
-	ret = config_get_string(section, option, NULL);
-	if (ret == NULL)
 		return -1;
 
-	if (strsplit(ret, ":", part, 2) != 2)
+	int cnt = 0;
-		return -1;
+	struct conf_tupel *tupel;
-
+	list_for_each_entry(tupel, &section->tupel_list, list) {
-	sa->sin_family = AF_INET;
+		if (!strcmp(tupel->option, option))
-	sa->sin_port = htons(atoi(part[1]));
+			if (callback(tupel->parameter, privdata) == 0)
-	inet_aton(part[0], &sa->sin_addr);
+				cnt++;
-
+	}
-	return 0;
+	return cnt;
 }

configfile.h

@@ -1,27 +1,15 @@
 #ifndef _CONFIG_H_
 #define _CONFIG_H_
 
-#include <netinet/in.h>
+int config_parse(const char *config);
+void config_free(void);
 
-#include "list.h"
+const char * config_get_string(const char *section_str, const char *option, const char *def);
 
-struct conf_section {
+int config_get_int(const char *section, const char *option, int def);
-	struct list_head list;
-	char name[32];
-	struct list_head tupel;
-};
 
-struct conf_tupel {
+int config_get_strings(const char *section_str, const char *option,
-	struct list_head list;
+			int (*callback)(const char *value, void *privdata),
-	char *option;
+			void *privdata);
-	char *parameter;
-};
-
-int config_parse(char *config);
-struct conf_section * config_get_section(char *name);
-char * config_get_parameter(struct conf_section *section, char *option);
-char * config_get_string(char *section, char *option, char *def);
-int config_get_int(char *section, char *option, int def);
-int config_get_saddr(char *section, char *option, struct sockaddr_in *sa);
 
 #endif /* _CONFIG_H_ */

logging.c

@@ -29,75 +29,74 @@
 #define BUFSIZE 8192
 
 static FILE *log_fd = NULL;
+static int log_prio = LOG_EVERYTIME;
 static char *buffer = NULL;
 
-void log_print(int prio, const char *fmt, ...)
+int log_print(int prio, const char *fmt, ...)
 {
 	va_list az;
-	int len;
+	int len = 0, retval;
+
+	if (prio < log_prio)
+		return 0;
 
 	if (buffer == NULL) {
 		buffer = malloc(BUFSIZE);
 		if (buffer == NULL) {
-			fprintf(stderr, "log_print: out of memory\nBailing out!\n");
+			fprintf(stderr, "log_print(): out of memory\n");
-			exit(-1);
+			return -1;
 		}
 	}
 
+	if (log_fd != NULL) {
+		time_t  tzgr;
+		time(&tzgr);
+
+		len += strftime(buffer, BUFSIZE, "%b %d %H:%M:%S :", localtime(&tzgr));
+	}
+
 	va_start(az, fmt);
-	len = vsnprintf(buffer, BUFSIZE, fmt, az);
+	len += vsnprintf(buffer + len, BUFSIZE - len, fmt, az);
 	va_end(az);
 
 	if (len < 0 || len >= BUFSIZE) {
-		log_print(LOG_ERROR, "log_print: arguments too long");
 		errno = 0;
-		return;
+		return log_print(LOG_ERROR, "log_print: arguments too long");
 	}
 
 	if (errno) {
-		strncpy(buffer + len, ": ", BUFSIZE - len);
+		len += snprintf(buffer + len, BUFSIZE - len, ": %s", strerror(errno));
-		len += 2;
-		strncpy(buffer + len, strerror(errno), BUFSIZE - len);
-	}
-
-	if (log_fd) {
-		char    tbuf[64];
-		time_t  tzgr;
-
-		time(&tzgr);
-		strftime(tbuf, sizeof(tbuf), "%b %d %H:%M:%S :", localtime(&tzgr));
-
-		fprintf(log_fd, "%s %s\n", tbuf, buffer);
-		fflush(log_fd);
-
-	} else {
-		fprintf(stderr, "%s\n", buffer);
-	}
-
 		errno = 0;
+	}
+
+	retval = fprintf((log_fd ? log_fd : stderr), "%s\n", buffer);
+	fflush(log_fd);
+	return retval;
 }
 
-static void log_close(void)
+void log_close(void)
 {
 	if (buffer)
 		free(buffer);
 
+	if (log_fd)
 		fclose(log_fd);
 }
 
-int log_init(char *logfile)
+int log_init(const char *logfile)
 {
+	if (log_fd != NULL)
+		log_close();
+
 	log_fd = fopen(logfile, "a");
 	if (log_fd == NULL) {
-		log_print(LOG_ERROR, "log_open('%s'): %s", logfile);
+		fprintf(stderr, "log_init(): can not open logfile");
-		return 0;
+		return -1;
 	}
-
-	if (atexit(log_close) != 0) {
-		log_print(LOG_ERROR, "log_open(): atexit()");
 	return 0;
-	}
+}
-
+
-	log_print(LOG_EVERYTIME, "==========================");
+void log_setprio(int prio)
-	return 1;
+{
+	log_prio = prio;
 }

logging.h

@@ -10,7 +10,10 @@
 
 #define LOG_EVERYTIME 0
 
-int log_init(char *logfile);
+int log_init(const char *logfile);
-void log_print(int prio, const char *fmt, ... );
+void log_close(void);
+void log_setprio(int prio);
+
+int log_print(int prio, const char *fmt, ... );
 
 #endif /* _LOGGING_H_ */

network.c

@@ -24,7 +24,7 @@ static int fwd_sock;
 static char *tx_buf, *rx_buf;
 static int tx_pos;
 
-int net_submit(char *hostname, char *plugin, char *filename, int ds_id, char *data)
+int net_submit(const char *hostname, char *plugin, char *filename, int ds_id, char *data)
 {
 	int size = snprintf(tx_buf + tx_pos, BUFSIZE - tx_pos, "%s:%s:%s:%d %s\n",
 				hostname, plugin, filename, ds_id, data);
@@ -76,9 +76,27 @@ int net_receive(int socket)
 	return 0;
 }
 
+static int net_config_get_saddr(char *section, char *option, struct sockaddr_in *sa)
+{
+	char *part[2];
+
+	const char *ret = config_get_string(section, option, NULL);
+	if (ret == NULL)
+		return -1;
+
+	if (strsplit(ret, ":", part, 2) != 2)
+		return -1;
+
+	sa->sin_family = AF_INET;
+	sa->sin_port = htons(atoi(part[1]));
+	inet_aton(part[0], &sa->sin_addr);
+
+	return 0;
+}
+
 int net_init_cli()
 {
-	int ret = config_get_saddr("global", "forward", &fwd_sa);
+	int ret = net_config_get_saddr("global", "forward", &fwd_sa);
 	if (ret < 0)
 		return -1;
 
@@ -104,7 +122,7 @@ int net_init_srv()
 {
 	struct sockaddr_in sa_srv;
 
-	int ret = config_get_saddr("global", "listen", &sa_srv);
+	int ret = net_config_get_saddr("global", "listen", &sa_srv);
 	if (ret < 0)
 		return -1;
 

network.h

@@ -7,7 +7,7 @@ int net_init_srv();
 int net_init_cli();
 int net_receive(int sock);
 
-int net_submit(char *hostname, char *plugin, char *filename, int ds_id, char *data);
+int net_submit(const char *hostname, char *plugin, char *filename, int ds_id, char *data);
 int net_submit_flush();
 
 #endif /* _NETWORK_H_ */

p_apache.c

@@ -20,6 +20,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <stdint.h>
 
 #include <curl/curl.h>
 
@@ -118,38 +119,19 @@ static int probe(void)
 	return 0;
 }
 
-static int init(void)
+static int init_cb(const char *parameter, void *privdata)
 {
-	rx_buf = malloc(BUFSIZE);
-	if (rx_buf == NULL) {
-		log_print(LOG_ERROR, "p_apache: out of memory");
-		return -1;
-	}
-
-	struct conf_section *section;
-	section = config_get_section("p_apache");
-	if (section == NULL) {
-		log_print(LOG_ERROR, "p_apache: no config section found");
-		free(rx_buf);
-		return -1;
-	}
-
-	struct conf_tupel *tupel;
-	list_for_each_entry(tupel, &section->tupel, list) {
-		if (strcmp(tupel->option, "server"))
-			continue;
-
 	char *part[4];
-		int ret = strsplit(tupel->parameter, ",", part, 4);
+	int ret = strsplit(parameter, ",", part, 4);
 	if (ret < 2) {
 		log_print(LOG_ERROR, "p_apache: parse error (1)");
-			continue;
+		return -1;
 	}
 
 	struct server_entry *entry = malloc(sizeof(struct server_entry));
 	if (entry == NULL) {
 		log_print(LOG_ERROR, "p_apache: out of memory");
-			continue;
+		return -1;
 	}
 
 	// reference config mem
@@ -158,7 +140,7 @@ static int init(void)
 	entry->handle = curl_easy_init();
 	if (entry->handle == NULL) {
 		free(entry);
-			continue;
+		return -1;
 	}
 
 	ret = curl_easy_setopt(entry->handle, CURLOPT_URL, part[1]);
@@ -166,7 +148,7 @@ static int init(void)
 		log_print(LOG_ERROR, "p_apache: %s", curl_easy_strerror(ret));
 		curl_easy_cleanup(entry->handle);
 		free(entry);
-			continue;
+		return -1;
 	}
 
 	if (part[2] != NULL && part[3] != NULL) {
@@ -179,7 +161,7 @@ static int init(void)
 			log_print(LOG_ERROR, "p_apache: %s", curl_easy_strerror(ret));
 			curl_easy_cleanup(entry->handle);
 			free(entry);
-				continue;
+			return -1;
 		}
 	}
 
@@ -188,7 +170,7 @@ static int init(void)
 		log_print(LOG_ERROR, "p_apache: %s", curl_easy_strerror(ret));
 		curl_easy_cleanup(entry->handle);
 		free(entry);
-			continue;
+		return -1;
 	}
 
 	ret = curl_easy_setopt(entry->handle, CURLOPT_WRITEDATA, entry);
@@ -196,12 +178,24 @@ static int init(void)
 		log_print(LOG_ERROR, "p_apache: %s", curl_easy_strerror(ret));
 		curl_easy_cleanup(entry->handle);
 		free(entry);
-			continue;
+		return -1;
 	}
 
 	log_print(LOG_INFO, "p_apache: added server '%s'", entry->name);
 	list_add_tail(&entry->list, &server_list);
+	return 0;
+}
+
+
+static int init(void)
+{
+	rx_buf = malloc(BUFSIZE);
+	if (rx_buf == NULL) {
+		log_print(LOG_ERROR, "p_apache: out of memory");
+		return -1;
 	}
+
+	config_get_strings("p_apache", "server", init_cb, NULL);
 	return 0;
 }
 

p_mysql.c

@@ -148,36 +148,24 @@ static int probe(void)
 	return 0;
 }
 
-static int init(void)
+static int init_cb(const char *parameter, void *privdata)
 {
-	struct conf_section *section;
-	section = config_get_section("p_mysql");
-	if (section == NULL) {
-		log_print(LOG_ERROR, "p_mysql: no config section found");
-		return -1;
-	}
-
-	struct conf_tupel *tupel;
-	list_for_each_entry(tupel, &section->tupel, list) {
-		if (strcmp(tupel->option, "server"))
-			continue;
-
 	char *part[4];
-		int ret = strsplit(tupel->parameter, ",", part, 4);
+	int ret = strsplit(parameter, ",", part, 4);
 	if (ret != 4) {
 		log_print(LOG_ERROR, "p_mysql: parse error");
-			continue;
+		return -1;
 	}
 
 	void *mysql = init_connection(part[1], part[2], part[3]);
 	if (mysql == NULL)
-			continue;
+		return -1;
 
 	struct server_entry *entry = malloc(sizeof(struct server_entry));
 	if (entry == NULL) {
 		log_print(LOG_ERROR, "p_mysql: out of memory");
 		close_connection(mysql);
-			continue;
+		return -1;
 	}
 
 	entry->name = part[0];
@@ -185,7 +173,12 @@ static int init(void)
 
 	log_print(LOG_DEBUG, "p_mysql: added server '%s'", entry->name);
 	list_add_tail(&entry->list, &server_list);
-	}
+	return 0;
+}
+
+static int init(void)
+{
+	config_get_strings("p_mysql", "server", init_cb, NULL);
 	return 0;
 }
 

plugins.c

@@ -39,10 +39,10 @@ static LIST_HEAD(plugin_list);
 
 static int plugin_flags;
 
-static int plugin_load(char *filename)
+static int plugin_init_cb(const char *filename, void *privdata)
 {
 	struct sammler_plugin *plugin = NULL;
-	static char *plugin_dir;
+	static const char *plugin_dir;
 
 	char *buffer;
 	void *tmp;
@@ -95,16 +95,7 @@ static int plugin_load(char *filename)
 
 void plugin_init(int flags)
 {
-	struct conf_section *section;
+	config_get_strings("global", "plugin", plugin_init_cb, NULL);
-	section = config_get_section("global");
-	if (section == NULL)
-		return;
-
-	struct conf_tupel *tupel;
-	list_for_each_entry(tupel, &section->tupel, list)
-		if (!strcmp(tupel->option, "plugin"))
-			plugin_load(tupel->parameter);
-
 	plugin_flags = flags;
 }
 
@@ -139,7 +130,7 @@ struct sammler_plugin * plugin_lookup(char *name)
 
 int probe_submit(struct sammler_plugin *plugin, char *filename, int ds_id, const char *fmt, ... )
 {
-	static char *hostname = NULL;
+	static const char *hostname = NULL;
 
 	va_list az;
 	char *buffer;

rrdtool.c

@@ -42,33 +42,35 @@
 
 #define BUFSIZE		1024
 
+struct rra_cb_data {
+	char *buffer;
+	int size;
+	int *pos;
+};
+
+static int append_rra_config_cb(const char *parameter, void *privdata)
+{
+	struct rra_cb_data *data = (struct rra_cb_data *)privdata;
+
+	int len = snprintf(data->buffer + *(data->pos), data->size - *(data->pos), "%s ", parameter);
+	if (len < 0 || len >= data->size - *(data->pos)) {
+		log_print(LOG_ERROR, "append_rra_config_cb: arguments too long");
+		return -1;
+	}
+
+	*(data->pos) += len;
+	return 0;
+}
+
 static int append_rra_config(char *buffer, int size, int *pos)
 {
-	struct conf_section *section;
+	struct rra_cb_data data = {
-	struct conf_tupel *tupel;
+		.buffer = buffer,
+		.size = size,
+		.pos = pos,
+	};
 
-	int len, rra_cnt = 0;
+	return config_get_strings("global", "rra", append_rra_config_cb, &data);
-
-	section = config_get_section("global");
-	if (section == NULL) {
-		log_print(LOG_ERROR, "append_ds_config: conf-section 'global' not found");
-		return -1;
-	}
-
-	list_for_each_entry(tupel, &section->tupel, list) {
-		if (strcmp(tupel->option, "rra"))
-			continue;
-
-		len = snprintf(buffer + *pos, size - *pos, "%s ", tupel->parameter);
-		if (len < 0 || len >= size - *pos) {
-			log_print(LOG_ERROR, "append_ds_config: arguments too long");
-			return -1;
-		}
-
-		*pos += len;
-		rra_cnt++;
-	}
-	return rra_cnt;
 }
 
 static int do_rrd(int mode, char *cmd)
@@ -226,10 +228,10 @@ static int create_parent_dirs(char *filename)
 	return 0;
 }
 
-int rrd_submit(char *hostname, char *plugin, char *filename, int ds_id, char *data)
+int rrd_submit(const char *hostname, char *plugin, char *filename, int ds_id, char *data)
 {
 	struct stat statbuf;
-	static char *rrd_dir = NULL;
+	static const char *rrd_dir = NULL;
 
 	char *fullfile;
 	int len;

rrdtool.h

@@ -2,7 +2,7 @@
 #define _RRDTOOL_H_
 
 #ifdef WITH_RRD
-int rrd_submit(char *hostname, char *plugin, char *filename, int ds_id, char *data);
+int rrd_submit(const char *hostname, char *plugin, char *filename, int ds_id, char *data);
 #else
 #define rrd_submit(hostname, plugin, filename, ds_id, data)
 #endif

sammler.c

@@ -79,21 +79,21 @@ int main(int argc, char *argv[])
 	} while (code != -1);
 
 	/* parse config file */
-	if (!config_parse(config))
+	if (config_parse(config))
 		exit(-1);
 
 	/* check logfile */
-	char *logfile = config_get_string("global", "logfile", DEFAULT_LOGFILE);
+	const char *logfile = config_get_string("global", "logfile", DEFAULT_LOGFILE);
 	if (logfile != NULL && debug == 0) {
 		/* start logging */
-		if (!log_init(logfile))
+		if (log_init(logfile))
 			exit(-1);
 
 		/* zum daemon mutieren */
 		daemon(-1, 0);
 	}
 
-	char *hostname = config_get_string("global", "hostname", "localhost");
+	const char *hostname = config_get_string("global", "hostname", "localhost");
 	log_print(LOG_EVERYTIME, "sammler (pid:%d) started on host '%s'", getpid(), hostname);
 
 	fd_set fdsel, fdcpy;
@@ -107,7 +107,7 @@ int main(int argc, char *argv[])
 	if (net_init_cli() != -1)
 		probe_flags |= PLUGIN_NET;
 
-	char *fwd_only = config_get_string("global", "forward_only", NULL);
+	const char *fwd_only = config_get_string("global", "forward_only", NULL);
 	if (fwd_only == NULL || strncmp(fwd_only, "true", 4))
 		probe_flags |= PLUGIN_RRD;