initial

.gitignore

@@ -0,0 +1,5 @@
+libircclient
+*.o
+*.d
+irclogbot
+irclogbot.log

Makefile

@@ -0,0 +1,20 @@
+CFLAGS := -O2 -pipe -Wall
+
+OBJS := configfile.o logging.o
+
+all: irclogbot
+
+irclogbot: $(OBJS) irclogbot.o
+	$(CC) $(CFLAGS) -o $@ $^ libircclient/src/libircclient.a
+
+%.o: %.c
+	$(CC) $(CFLAGS) -c $< -o $@
+
+%.d: %.c
+	$(CC) $(CFLAGS) -MM -c $< -o $@
+
+clean:
+	rm -f irclogbot *.d *.o *.log
+
+DEPS := $(wildcard *.c)
+-include $(DEPS:.c=.d)

configfile.c

@@ -0,0 +1,217 @@
+/***************************************************************************
+ *   Copyright (C) 06/2006 by Olaf Rempel                                  *
+ *   razzor@kopf-tisch.de                                                  *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
+ ***************************************************************************/
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netinet/ip.h>
+#include <arpa/inet.h>
+
+#include "configfile.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(const char *name)
+{
+	struct conf_section *section;
+	section = malloc(sizeof(struct conf_section) + strlen(name));
+	if (section == NULL)
+		return NULL;
+
+	INIT_LIST_HEAD(&section->list);
+	INIT_LIST_HEAD(&section->tupel_list);
+
+	section->name = strdup(name);
+	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, const char *option, const char *parameter)
+{
+	struct conf_tupel *tupel = malloc(sizeof(struct conf_tupel));
+	if (tupel == NULL)
+		return -1;
+
+	INIT_LIST_HEAD(&tupel->list);
+	tupel->option = strdup(option);
+	tupel->parameter = strdup(parameter);
+
+	if (tupel->option == NULL || tupel->parameter == NULL) {
+		free(tupel);
+		return -1;
+	}
+
+	list_add_tail(&tupel->list, &section->tupel_list);
+	return 0;
+}
+
+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) {
+			list_del(&tupel->list);
+			free((char *)tupel->option);
+			free((char *)tupel->parameter);
+			free(tupel);
+		}
+		list_del(&section->list);
+		free(section);
+	}
+}
+
+static struct conf_section * config_get_section(const char *name)
+{
+	struct conf_section *section;
+
+	list_for_each_entry(section, &config_list, list) {
+		if (!strcmp(section->name, name))
+			return section;
+	}
+	return NULL;
+}
+
+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) {
+			if (!strcmp(tupel->option, option))
+				return tupel->parameter;
+		}
+	}
+
+	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(const char *section, const char *option, int def)
+{
+	const char *ret = config_get_string(section, option, NULL);
+	if (ret == NULL) {
+		log_print(LOG_WARN, "config [%s:%s] not found, using default: '%d'",
+			section, option, def);
+		return def;
+	}
+	return atoi(ret);
+}
+
+int config_get_strings(const char *section_str, const char *option,
+			int (*callback)(const char *value, void *privdata),
+			void *privdata)
+{
+	struct conf_section *section = config_get_section(section_str);
+	if (section == NULL)
+		return -1;
+
+	int cnt = 0;
+	struct conf_tupel *tupel;
+	list_for_each_entry(tupel, &section->tupel_list, list) {
+		if (!strcmp(tupel->option, option))
+			if (callback(tupel->parameter, privdata) == 0)
+				cnt++;
+	}
+	return cnt;
+}

configfile.h

@@ -0,0 +1,15 @@
+#ifndef _CONFIG_H_
+#define _CONFIG_H_
+
+int config_parse(const char *config);
+void config_free(void);
+
+const char * config_get_string(const char *section_str, const char *option, const char *def);
+
+int config_get_int(const char *section, const char *option, int def);
+
+int config_get_strings(const char *section_str, const char *option,
+			int (*callback)(const char *value, void *privdata),
+			void *privdata);
+
+#endif /* _CONFIG_H_ */

irclogbot.c

@@ -0,0 +1,244 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <getopt.h>
+
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <netinet/in.h>
+#include <errno.h>
+
+#include "libircclient/include/libircclient.h"
+
+#include "configfile.h"
+#include "list.h"
+#include "logging.h"
+
+#define DEFAULT_CONFIG "irclogbot.conf"
+#define DEFAULT_LOGFILE "irclogbot.log"
+
+static struct option opts[] = {
+	{"config",	1, 0, 'c'},
+	{"debug",	0, 0, 'd'},
+	{"help",	0, 0, 'h'},
+	{0, 0, 0, 0}
+};
+
+struct irc_client {
+	struct list_head list;
+
+	irc_session_t *session;
+	const char *server;
+	const char *nickname;
+	const char *channel;
+	const char *channelkey;
+
+	struct in_addr addr;
+};
+
+static LIST_HEAD(client_list);
+static irc_callbacks_t irc_cbs;
+
+static int add_client(const char *parameter, void *privdata)
+{
+	struct irc_client *entry = malloc(sizeof(struct irc_client));
+	if (entry == NULL) {
+		log_print(LOG_ERROR, "add_client(): out of memory");
+		return -1;
+	}
+
+	if (inet_pton(AF_INET, parameter, &entry->addr) <= 0) {
+		log_print(LOG_ERROR, "add_client(): inet_pton()");
+		free(entry);
+		return -1;
+	}
+
+	const char *defserver = config_get_string("global", "server", NULL);
+	entry->server = config_get_string(parameter, "server", defserver);
+	if (entry->server == NULL) {
+		log_print(LOG_ERROR, "add_client(): client %s: no server given", parameter);
+		free(entry);
+		return -1;
+	}
+
+	const char *defchannel = config_get_string("global", "channel", NULL);
+	entry->channel = config_get_string(parameter, "channel", defchannel);
+	if (entry->channel == NULL) {
+		log_print(LOG_ERROR, "add_client(): client %s: no channel given", parameter);
+		free(entry);
+		return -1;
+	}
+
+	const char *defchannelkey = config_get_string("global", "channelkey", NULL);
+	entry->channelkey = config_get_string(parameter, "channelkey", defchannelkey);
+
+	entry->nickname = config_get_string(parameter, "nickname", NULL);
+	if (entry->nickname == NULL) {
+		log_print(LOG_ERROR, "add_client(): client %s: no nickname given", parameter);
+		free(entry);
+		return -1;
+	}
+
+	entry->session = irc_create_session(&irc_cbs);
+	if (entry->session == NULL) {
+		log_print(LOG_ERROR, "add_client(): irc_create_session()");
+		free(entry);
+		return -1;
+	}
+
+	irc_set_ctx(entry->session, entry);
+	irc_option_set(entry->session, LIBIRC_OPTION_STRIPNICKS);
+
+	int ret = irc_connect(entry->session, entry->server, 6667, NULL, entry->nickname, NULL, NULL);
+	if (ret != 0) {
+		log_print(LOG_ERROR, "add_client(): irc_connect(): %s", irc_strerror(irc_errno(entry->session)));
+		irc_destroy_session(entry->session);
+		free(entry);
+		return -1;
+	}
+
+	/* HACK: irc_connect() sets errno */
+	errno = 0;
+
+	log_print(LOG_DEBUG, "added client %s (server: %s  chan: %s  nickname: %s)",
+		parameter, entry->server, entry->channel, entry->nickname);
+
+	list_add(&entry->list, &client_list);
+	return 0;
+}
+
+static void event_connect(irc_session_t *session, const char *event, const char *origin, const char **params, unsigned int count)
+{
+	struct irc_client *entry = (struct irc_client *) irc_get_ctx(session);
+	irc_cmd_join(session, entry->channel, entry->channelkey);
+}
+
+static void event_join(irc_session_t *session, const char *event, const char *origin, const char **params, unsigned int count)
+{
+	struct irc_client *entry = (struct irc_client *) irc_get_ctx(session);
+	irc_cmd_user_mode(session, "+i");
+
+	char buf[32] = { "forwarding from " };
+	inet_ntop(AF_INET, &entry->addr, buf +16, 16);
+
+	irc_cmd_msg(session, params[0], buf);
+}
+
+static void event_numeric(irc_session_t *session, unsigned int event, const char *origin, const char **params, unsigned int count)
+{
+	if (event < 400)
+		return;
+
+	log_print(LOG_INFO, "EVENT %d: %s: %s %s %s %s",
+			event, (origin ? origin : "unknown"), params[0],
+			count > 1 ? params[1] : "",
+			count > 2 ? params[2] : "",
+			count > 3 ? params[3] : "");
+}
+
+int main(int argc, char *argv[])
+{
+	char *config = DEFAULT_CONFIG;
+	int code, arg = 0, debug = 0;
+
+	do {
+		code = getopt_long(argc, argv, "c:dh", opts, &arg);
+
+		switch (code) {
+		case 'c':	/* config */
+				config = optarg;
+				break;
+
+		case 'd':	/* debug */
+				debug = 1;
+				break;
+
+		case 'h':	/* help */
+				printf("Usage: ctstat [options]\n"
+					"Options: \n"
+					"  --config       -c  configfile  use this configfile\n"
+					"  --debug        -d              do not fork and log to stderr\n"
+					"  --help         -h              this help\n"
+					"\n");
+				exit(0);
+				break;
+
+		case '?':	/* error */
+				exit(-1);
+				break;
+
+		default:	/* unknown / all options parsed */
+				break;
+		}
+	} while (code != -1);
+
+	/* parse config file */
+	if (config_parse(config))
+		exit(1);
+
+	int sock = socket(PF_INET, SOCK_DGRAM, 0);
+	if (sock < 0) {
+		log_print(LOG_ERROR, "socket()");
+		return -1;
+	}
+
+	struct sockaddr_in addr = {
+		.sin_family = AF_INET,
+		.sin_port = htons(514),
+		.sin_addr.s_addr = INADDR_ANY,
+	};
+
+	if (bind(sock, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
+		log_print(LOG_ERROR, "bind()");
+		return -1;
+	}
+
+	irc_cbs.event_connect = event_connect;
+	irc_cbs.event_join = event_join;
+	irc_cbs.event_numeric = event_numeric;
+
+	int cnt = config_get_strings("global", "client", add_client, NULL);
+	if (cnt == 0) {
+		log_print(LOG_ERROR, "no clients defined");
+		close(sock);
+		exit(1);
+	}
+
+	char buf[1500];
+	while (1) {
+		fd_set rd_fds, wr_fds;
+		FD_ZERO(&rd_fds);
+		FD_ZERO(&wr_fds);
+
+		FD_SET(sock, &rd_fds);
+
+		int maxfd = sock;
+		struct irc_client *entry;
+		list_for_each_entry(entry, &client_list, list) {
+			int ret = irc_add_select_descriptors(entry->session, &rd_fds, &wr_fds, &maxfd);
+			if (ret != 0)
+				log_print(LOG_WARN, "irc_add_select_descriptors(): %s", irc_strerror(irc_errno(entry->session)));
+		}
+
+		select(maxfd +1, &rd_fds, &wr_fds, NULL, NULL);
+
+		int len = 0;
+		if (FD_ISSET(sock, &rd_fds)) {
+			unsigned int i = sizeof(addr);
+			len = recvfrom(sock, buf, sizeof(buf), 0, (struct sockaddr *)&addr, &i);
+		}
+
+		list_for_each_entry(entry, &client_list, list) {
+			if (len > 0 && (entry->addr.s_addr == addr.sin_addr.s_addr))
+				irc_cmd_msg(entry->session, entry->channel, buf);
+
+			int ret = irc_process_select_descriptors(entry->session, &rd_fds, &wr_fds);
+			if (ret != 0)
+				log_print(LOG_WARN, "irc_process_select_descriptors(): %s", irc_strerror(irc_errno(entry->session)));
+		}
+	}
+	return 0;
+}

irclogbot.conf

@@ -0,0 +1,12 @@
+[global]
+server irc.quakenet.org
+channel #logtest
+
+client 127.0.0.1
+client 10.10.250.133
+
+[127.0.0.1]
+nickname logtest1
+
+[10.10.250.133]
+nickname logtest2

list.h

@@ -0,0 +1,268 @@
+#ifndef _LIST_H_
+#define _LIST_H_
+
+/*
+ * stolen from linux kernel 2.6.11 (http://kernel.org/)
+ * linux/include/linux/stddef.h (offsetoff)
+ * linux/include/linux/kernel.h (container_of)
+ * linux/include/linux/list.h (*list*)
+ * linux/include/linux/netfilter_ipv4/listhelp.h (LIST_FIND)
+ *
+ * modified by Olaf Rempel <razzor@kopf-tisch.de>
+ */
+#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
+
+#define container_of(ptr, type, member) ({ \
+		const typeof( ((type *)0)->member ) *__mptr = (ptr); \
+		(type *)( (char *)__mptr - offsetof(type,member) );})
+
+struct list_head {
+	struct list_head *next, *prev;
+};
+
+#define LIST_HEAD_INIT(name) { &(name), &(name) }
+
+#define LIST_HEAD(name) \
+	struct list_head name = LIST_HEAD_INIT(name)
+
+#define INIT_LIST_HEAD(ptr) do { \
+	(ptr)->next = (ptr); (ptr)->prev = (ptr); \
+} while (0)
+
+/*
+ * Insert a new entry between two known consecutive entries.
+ *
+ * This is only for internal list manipulation where we know
+ * the prev/next entries already!
+ */
+static inline void __list_add(struct list_head *new,
+			      struct list_head *prev,
+			      struct list_head *next)
+{
+	next->prev = new;
+	new->next = next;
+	new->prev = prev;
+	prev->next = new;
+}
+
+/*
+ * list_add - add a new entry
+ * @new: new entry to be added
+ * @head: list head to add it after
+ *
+ * Insert a new entry after the specified head.
+ * This is good for implementing stacks.
+ */
+static inline void list_add(struct list_head *new, struct list_head *head)
+{
+	__list_add(new, head, head->next);
+}
+
+/*
+ * list_add_tail - add a new entry
+ * @new: new entry to be added
+ * @head: list head to add it before
+ *
+ * Insert a new entry before the specified head.
+ * This is useful for implementing queues.
+ */
+static inline void list_add_tail(struct list_head *new, struct list_head *head)
+{
+	__list_add(new, head->prev, head);
+}
+
+/*
+ * Delete a list entry by making the prev/next entries
+ * point to each other.
+ *
+ * This is only for internal list manipulation where we know
+ * the prev/next entries already!
+ */
+static inline void __list_del(struct list_head * prev, struct list_head * next)
+{
+	next->prev = prev;
+	prev->next = next;
+}
+
+/*
+ * list_del - deletes entry from list.
+ * @entry: the element to delete from the list.
+ * Note: list_empty on entry does not return true after this, the entry is
+ * in an undefined state.
+ */
+static inline void list_del(struct list_head *entry)
+{
+	__list_del(entry->prev, entry->next);
+	entry->next = NULL;
+	entry->prev = NULL;
+}
+
+/*
+ * list_del_init - deletes entry from list and reinitialize it.
+ * entry: the element to delete from the list.
+ */
+static inline void list_del_init(struct list_head *entry)
+{
+	__list_del(entry->prev, entry->next);
+	INIT_LIST_HEAD(entry);
+}
+
+/*
+ * list_move - delete from one list and add as another's head
+ * @list: the entry to move
+ * @head: the head that will precede our entry
+ */
+static inline void list_move(struct list_head *list, struct list_head *head)
+{
+        __list_del(list->prev, list->next);
+        list_add(list, head);
+}
+
+/*
+ * list_move_tail - delete from one list and add as another's tail
+ * @list: the entry to move
+ * @head: the head that will follow our entry
+ */
+static inline void list_move_tail(struct list_head *list,
+				  struct list_head *head)
+{
+        __list_del(list->prev, list->next);
+        list_add_tail(list, head);
+}
+
+/*
+ * list_empty - tests whether a list is empty
+ * @head: the list to test.
+ */
+static inline int list_empty(const struct list_head *head)
+{
+	return head->next == head;
+}
+
+static inline void __list_splice(struct list_head *list,
+				 struct list_head *head)
+{
+	struct list_head *first = list->next;
+	struct list_head *last = list->prev;
+	struct list_head *at = head->next;
+
+	first->prev = head;
+	head->next = first;
+
+	last->next = at;
+	at->prev = last;
+}
+
+/*
+ * list_splice - join two lists
+ * @list: the new list to add.
+ * @head: the place to add it in the first list.
+ */
+static inline void list_splice(struct list_head *list, struct list_head *head)
+{
+	if (!list_empty(list))
+		__list_splice(list, head);
+}
+
+/*
+ * list_splice_init - join two lists and reinitialise the emptied list.
+ * @list: the new list to add.
+ * @head: the place to add it in the first list.
+ *
+ * The list at @list is reinitialised
+ */
+static inline void list_splice_init(struct list_head *list,
+				    struct list_head *head)
+{
+	if (!list_empty(list)) {
+		__list_splice(list, head);
+		INIT_LIST_HEAD(list);
+	}
+}
+
+/*
+ * list_entry - get the struct for this entry
+ * @ptr:	the &struct list_head pointer.
+ * @type:	the type of the struct this is embedded in.
+ * @member:	the name of the list_struct within the struct.
+ */
+#define list_entry(ptr, type, member) \
+	container_of(ptr, type, member)
+
+/*
+ * list_for_each	-	iterate over a list
+ * @pos:	the &struct list_head to use as a loop counter.
+ * @head:	the head for your list.
+ */
+#define list_for_each(pos, head) \
+	for (pos = (head)->next; pos != (head); pos = pos->next)
+
+/*
+ * list_for_each_prev	-	iterate over a list backwards
+ * @pos:	the &struct list_head to use as a loop counter.
+ * @head:	the head for your list.
+ */
+#define list_for_each_prev(pos, head) \
+	for (pos = (head)->prev; pos != (head); pos = pos->prev)
+
+/*
+ * list_for_each_safe	-	iterate over a list safe against removal of list entry
+ * @pos:	the &struct list_head to use as a loop counter.
+ * @n:		another &struct list_head to use as temporary storage
+ * @head:	the head for your list.
+ */
+#define list_for_each_safe(pos, n, head) \
+	for (pos = (head)->next, n = pos->next; pos != (head); \
+		pos = n, n = pos->next)
+
+/*
+ * list_for_each_entry	-	iterate over list of given type
+ * @pos:	the type * to use as a loop counter.
+ * @head:	the head for your list.
+ * @member:	the name of the list_struct within the struct.
+ */
+#define list_for_each_entry(pos, head, member)				\
+	for (pos = list_entry((head)->next, typeof(*pos), member);	\
+	     &pos->member != (head); 					\
+	     pos = list_entry(pos->member.next, typeof(*pos), member))
+
+/*
+ * list_for_each_entry_reverse - iterate backwards over list of given type.
+ * @pos:	the type * to use as a loop counter.
+ * @head:	the head for your list.
+ * @member:	the name of the list_struct within the struct.
+ */
+#define list_for_each_entry_reverse(pos, head, member)			\
+	for (pos = list_entry((head)->prev, typeof(*pos), member);	\
+	     &pos->member != (head); 					\
+	     pos = list_entry(pos->member.prev, typeof(*pos), member))
+
+/*
+ * list_for_each_entry_safe - iterate over list of given type safe against removal of list entry
+ * @pos:	the type * to use as a loop counter.
+ * @n:		another type * to use as temporary storage
+ * @head:	the head for your list.
+ * @member:	the name of the list_struct within the struct.
+ */
+#define list_for_each_entry_safe(pos, n, head, member)			\
+	for (pos = list_entry((head)->next, typeof(*pos), member),	\
+		n = list_entry(pos->member.next, typeof(*pos), member);	\
+	     &pos->member != (head); 					\
+	     pos = n, n = list_entry(n->member.next, typeof(*n), member))
+
+
+/* Return pointer to first true entry, if any, or NULL.  A macro
+   required to allow inlining of cmpfn. */
+#define LIST_FIND(head, cmpfn, type, args...)           \
+({                                                      \
+        const struct list_head *__i, *__j = NULL;       \
+                                                        \
+        list_for_each(__i, (head))                      \
+                if (cmpfn((const type)__i , ## args)) { \
+                        __j = __i;                      \
+                        break;                          \
+                }                                       \
+        (type)__j;                                      \
+})
+
+#endif /* _LIST_H_ */

logging.c

@@ -0,0 +1,102 @@
+/***************************************************************************
+ *   Copyright (C) 06/2006 by Olaf Rempel                                  *
+ *   razzor@kopf-tisch.de                                                  *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
+ ***************************************************************************/
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <stdarg.h>
+#include <errno.h>
+#include <string.h>
+
+#include "logging.h"
+
+#define BUFSIZE 8192
+
+static FILE *log_fd = NULL;
+static int log_prio = LOG_EVERYTIME;
+static char *buffer = NULL;
+
+int log_print(int prio, const char *fmt, ...)
+{
+	va_list az;
+	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\n");
+			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 + len, BUFSIZE - len, fmt, az);
+	va_end(az);
+
+	if (len < 0 || len >= BUFSIZE) {
+		errno = 0;
+		return log_print(LOG_ERROR, "log_print: arguments too long");
+	}
+
+	if (errno) {
+		len += snprintf(buffer + len, BUFSIZE - len, ": %s", strerror(errno));
+		errno = 0;
+	}
+
+	retval = fprintf((log_fd ? log_fd : stderr), "%s\n", buffer);
+	fflush(log_fd);
+	return retval;
+}
+
+void log_close(void)
+{
+	if (buffer)
+		free(buffer);
+
+	if (log_fd)
+		fclose(log_fd);
+}
+
+int log_init(const char *logfile)
+{
+	if (log_fd != NULL)
+		log_close();
+
+	log_fd = fopen(logfile, "a");
+	if (log_fd == NULL) {
+		fprintf(stderr, "log_init(): can not open logfile");
+		return -1;
+	}
+	return 0;
+}
+
+void log_setprio(int prio)
+{
+	log_prio = prio;
+}

logging.h

@@ -0,0 +1,19 @@
+#ifndef _LOGGING_H_
+#define _LOGGING_H_
+
+#define LOG_DEBUG 5
+#define LOG_INFO  4
+#define LOG_NOTICE 3
+#define LOG_WARN 2
+#define LOG_ERROR 1
+#define LOG_CRIT 0
+
+#define LOG_EVERYTIME 0
+
+int log_init(const char *logfile);
+void log_close(void);
+void log_setprio(int prio);
+
+int log_print(int prio, const char *fmt, ... );
+
+#endif /* _LOGGING_H_ */