imported KAME-DHCPv6 snapshot at 20051201KAME_20051201

1 files changed, 212 insertions, 0 deletions

diff --git a/timer.c b/timer.c
new file mode 100644
index 0000000..c74aa1f
--- /dev/null
+++ b/timer.c
@@ -0,0 +1,212 @@
+/*	$KAME: timer.c,v 1.6 2003/07/31 23:25:59 jinmei Exp $	*/
+
+/*
+ * Copyright (C) 2002 WIDE Project.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the project nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/socket.h>
+#include <sys/queue.h>
+
+#include <netinet/in.h>
+
+#include <unistd.h>
+#include <syslog.h>
+#include <stdlib.h>
+#include <string.h>
+#if defined(__NetBSD__) || defined(__OpenBSD__)
+#include <search.h>
+#endif
+#include "dhcp6.h"
+#include "config.h"
+#include "common.h"
+#include "timer.h"
+
+#define MILLION 1000000
+
+LIST_HEAD(, dhcp6_timer) timer_head;
+static struct timeval tm_sentinel;
+static struct timeval tm_max = {0x7fffffff, 0x7fffffff};
+
+static void timeval_add __P((struct timeval *, struct timeval *,
+			     struct timeval *));
+
+void
+dhcp6_timer_init()
+{
+	LIST_INIT(&timer_head);
+	tm_sentinel = tm_max;
+}
+
+struct dhcp6_timer *
+dhcp6_add_timer(timeout, timeodata)
+	struct dhcp6_timer *(*timeout) __P((void *));
+	void *timeodata;
+{
+	struct dhcp6_timer *newtimer;
+
+	if ((newtimer = malloc(sizeof(*newtimer))) == NULL) {
+		dprintf(LOG_ERR, FNAME, "can't allocate memory");
+		return (NULL);
+	}
+
+	memset(newtimer, 0, sizeof(*newtimer));
+
+	if (timeout == NULL) {
+		dprintf(LOG_ERR, FNAME, "timeout function unspecified");
+		exit(1);
+	}
+	newtimer->expire = timeout;
+	newtimer->expire_data = timeodata;
+	newtimer->tm = tm_max;
+
+	LIST_INSERT_HEAD(&timer_head, newtimer, link);
+
+	return (newtimer);
+}
+
+void
+dhcp6_remove_timer(timer)
+	struct dhcp6_timer **timer;
+{
+	LIST_REMOVE(*timer, link);
+	free(*timer);
+	*timer = NULL;
+}
+
+void
+dhcp6_set_timer(tm, timer)
+	struct timeval *tm;
+	struct dhcp6_timer *timer;
+{
+	struct timeval now;
+
+	/* reset the timer */
+	gettimeofday(&now, NULL);
+
+	timeval_add(&now, tm, &timer->tm);
+
+	/* update the next expiration time */
+	if (TIMEVAL_LT(timer->tm, tm_sentinel))
+		tm_sentinel = timer->tm;
+
+	return;
+}
+
+/*
+ * Check expiration for each timer. If a timer is expired,
+ * call the expire function for the timer and update the timer.
+ * Return the next interval for select() call.
+ */
+struct timeval *
+dhcp6_check_timer()
+{
+	static struct timeval returnval;
+	struct timeval now;
+	struct dhcp6_timer *tm, *tm_next;
+
+	gettimeofday(&now, NULL);
+
+	tm_sentinel = tm_max;
+	for (tm = LIST_FIRST(&timer_head); tm; tm = tm_next) {
+		tm_next = LIST_NEXT(tm, link);
+		
+		if (TIMEVAL_LEQ(tm->tm, now)) {
+			if ((*tm->expire)(tm->expire_data) == NULL)
+				continue; /* timer has been freed */
+		}
+
+		if (TIMEVAL_LT(tm->tm, tm_sentinel))
+			tm_sentinel = tm->tm;
+	}
+
+	if (TIMEVAL_EQUAL(tm_max, tm_sentinel)) {
+		/* no need to timeout */
+		return (NULL);
+	} else if (TIMEVAL_LT(tm_sentinel, now)) {
+		/* this may occur when the interval is too small */
+		returnval.tv_sec = returnval.tv_usec = 0;
+	} else
+		timeval_sub(&tm_sentinel, &now, &returnval);
+	return (&returnval);
+}
+
+struct timeval *
+dhcp6_timer_rest(timer)
+	struct dhcp6_timer *timer;
+{
+	struct timeval now;
+	static struct timeval returnval; /* XXX */
+
+	gettimeofday(&now, NULL);
+	if (TIMEVAL_LEQ(timer->tm, now)) {
+		dprintf(LOG_DEBUG, FNAME,
+		    "a timer must be expired, but not yet");
+		returnval.tv_sec = returnval.tv_usec = 0;
+	} else
+		timeval_sub(&timer->tm, &now, &returnval);
+
+	return (&returnval);
+}
+
+/* result = a + b */
+static void
+timeval_add(a, b, result)
+	struct timeval *a, *b, *result;
+{
+	long l;
+
+	if ((l = a->tv_usec + b->tv_usec) < MILLION) {
+		result->tv_usec = l;
+		result->tv_sec = a->tv_sec + b->tv_sec;
+	}
+	else {
+		result->tv_usec = l - MILLION;
+		result->tv_sec = a->tv_sec + b->tv_sec + 1;
+	}
+}
+
+/*
+ * result = a - b
+ * XXX: this function assumes that a >= b.
+ */
+void
+timeval_sub(a, b, result)
+	struct timeval *a, *b, *result;
+{
+	long l;
+
+	if ((l = a->tv_usec - b->tv_usec) >= 0) {
+		result->tv_usec = l;
+		result->tv_sec = a->tv_sec - b->tv_sec;
+	}
+	else {
+		result->tv_usec = MILLION + l;
+		result->tv_sec = a->tv_sec - b->tv_sec - 1;
+	}
+}