1 files changed, 141 insertions, 0 deletions
diff --git a/src/alarm.c b/src/alarm.c
new file mode 100644
index 0000000..1a465c2
--- /dev/null
+++ b/src/alarm.c
@@ -0,0 +1,141 @@
+/*
+ * (C) 2006 by Pablo Neira Ayuso <pablo@netfilter.org>
+ * 
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <unistd.h>
+#include <stdlib.h>
+#include "linux_list.h"
+#include "conntrackd.h"
+#include "alarm.h"
+#include "jhash.h"
+#include <pthread.h>
+#include <time.h>
+#include <errno.h>
+
+/* alarm cascade */
+#define ALARM_CASCADE_SIZE     10
+static struct list_head *alarm_cascade;
+
+/* thread stuff */
+static pthread_t alarm_thread;
+
+struct alarm_list *create_alarm()
+{	
+	return (struct alarm_list *) malloc(sizeof(struct alarm_list));
+}
+
+void destroy_alarm(struct alarm_list *t)
+{
+	free(t);
+}
+
+void set_alarm_expiration(struct alarm_list *t, unsigned long expires)
+{
+	t->expires = expires;
+}
+
+void set_alarm_function(struct alarm_list *t,
+			void (*fcn)(struct alarm_list *a, void *data))
+{
+	t->function = fcn;
+}
+
+void set_alarm_data(struct alarm_list *t, void *data)
+{
+	t->data = data;
+}
+
+void init_alarm(struct alarm_list *t)
+{
+	INIT_LIST_HEAD(&t->head);
+
+	t->expires 	= 0;
+	t->data 	= 0;
+	t->function 	= NULL;
+}
+
+void add_alarm(struct alarm_list *alarm)
+{
+	unsigned int pos = jhash(alarm, sizeof(alarm), 0) % ALARM_CASCADE_SIZE;
+
+	list_add(&alarm->head, &alarm_cascade[pos]);
+}
+
+void del_alarm(struct alarm_list *alarm)
+{
+	list_del(&alarm->head);
+}
+
+int mod_alarm(struct alarm_list *alarm, unsigned long expires)
+{
+	alarm->expires = expires;
+	return 0;
+}
+
+void __run_alarms()
+{
+	struct list_head *i, *tmp;
+	struct alarm_list *t;
+	struct timespec req = {0, 1000000000 / ALARM_CASCADE_SIZE};
+	struct timespec rem;
+	static int step = 0;
+
+retry:
+	if (nanosleep(&req, &rem) == -1) {
+		/* interrupted syscall: retry with remaining time */
+		if (errno == EINTR) {
+			memcpy(&req, &rem, sizeof(struct timespec));
+			goto retry;
+		}
+	}
+
+	lock();
+	list_for_each_safe(i, tmp, &alarm_cascade[step]) {
+		t = (struct alarm_list *) i;
+
+		t->expires--;
+		if (t->expires == 0)
+			t->function(t, t->data);
+	}
+	step = (step + 1) < ALARM_CASCADE_SIZE ? step + 1 : 0;
+	unlock();
+}
+
+void *run_alarms(void *foo)
+{
+	while(1)
+		__run_alarms();
+}
+
+int create_alarm_thread()
+{
+	int i;
+
+	alarm_cascade = malloc(sizeof(struct list_head) * ALARM_CASCADE_SIZE);
+	if (alarm_cascade == NULL)
+		return -1;
+
+	for (i=0; i<ALARM_CASCADE_SIZE; i++)
+		INIT_LIST_HEAD(&alarm_cascade[i]);
+
+	return pthread_create(&alarm_thread, NULL, run_alarms, NULL);
+}
+
+int destroy_alarm_thread()
+{
+	return pthread_cancel(alarm_thread);
+}