[dragonfly.git] / sbin / dhclient / dispatch.c

/*	$OpenBSD: src/sbin/dhclient/dispatch.c,v 1.50 2012/06/22 01:01:59 krw Exp $	*/

/*
 * Copyright 2004 Henning Brauer <henning@openbsd.org>
 * Copyright (c) 1995, 1996, 1997, 1998, 1999
 * The Internet Software Consortium.   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 Internet Software Consortium 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 INTERNET SOFTWARE CONSORTIUM 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 INTERNET SOFTWARE CONSORTIUM 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.
 *
 * This software has been written for the Internet Software Consortium
 * by Ted Lemon <mellon@fugue.com> in cooperation with Vixie
 * Enterprises.  To learn more about the Internet Software Consortium,
 * see ``http://www.vix.com/isc''.  To learn more about Vixie
 * Enterprises, see ``http://www.vix.com''.
 */

#include <sys/ioctl.h>

#include <net/if_media.h>

#include <ifaddrs.h>
#include <poll.h>

#include "dhcpd.h"

struct timeout *timeouts;
static struct timeout *free_timeouts;
static int interfaces_invalidated;

/*
 * Use getifaddrs() to get a list of all the attached interfaces.  For
 * each interface that's of type INET and not the loopback interface,
 * register that interface with the network I/O software, figure out
 * what subnet it's on, and add it to the list of interfaces.
 */
void
discover_interface(void)
{
	struct ifaddrs *ifap, *ifa;
	struct ifreq *tif;
	int len = IFNAMSIZ + sizeof(struct sockaddr_storage);

	if (getifaddrs(&ifap) != 0)
		error("getifaddrs failed");

	for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) {
		if ((ifa->ifa_flags & IFF_LOOPBACK) ||
		    (ifa->ifa_flags & IFF_POINTOPOINT) ||
		    (!(ifa->ifa_flags & IFF_UP)))
			continue;

		if (strcmp(ifi->name, ifa->ifa_name))
			continue;

		/*
		 * If we have the capability, extract link information
		 * and record it in a linked list.
		 */
		if (ifa->ifa_addr->sa_family == AF_LINK) {
			struct sockaddr_dl *foo =
			    (struct sockaddr_dl *)ifa->ifa_addr;

			ifi->index = foo->sdl_index;
			ifi->hw_address.hlen = foo->sdl_alen;
			ifi->hw_address.htype = HTYPE_ETHER; /* XXX */
			memcpy(ifi->hw_address.haddr,
			    LLADDR(foo), foo->sdl_alen);
		}
		if (!ifi->ifp) {
			if ((tif = malloc(len)) == NULL)
				error("no space to remember ifp");
			strlcpy(tif->ifr_name, ifa->ifa_name, IFNAMSIZ);
			ifi->ifp = tif;
		}
	}

	if (!ifi->ifp)
		error("%s: not found", ifi->name);

	/* Register the interface... */
	if_register_receive();
	if_register_send();
	freeifaddrs(ifap);
}

void
reinitialize_interface(void)
{
	interfaces_invalidated = 1;
}

/*
 * Wait for packets to come in using poll().  When a packet comes in, call
 * receive_packet to receive the packet and possibly strip hardware addressing
 * information from it, and then call do_packet to try to do something with it.
 */
void
dispatch(void)
{
	int count, to_msec;
	struct pollfd fds[2];
	time_t howlong;

	do {
		/*
		 * Call any expired timeouts, and then if there's still
		 * a timeout registered, time out the select call then.
		 */
another:
		if (!ifi)
			error("No interfaces available");

		if (!ifi->linkstat)
			interfaces_invalidated = 0;

		if (timeouts) {
			struct timeout *t;

			if (timeouts->when <= cur_time) {
				t = timeouts;
				timeouts = timeouts->next;
				(*(t->func))();
				t->next = free_timeouts;
				free_timeouts = t;
				goto another;
			}

			/*
			 * Figure timeout in milliseconds, and check for
			 * potential overflow, so we can cram into an
			 * int for poll, while not polling with a
			 * negative timeout and blocking indefinitely.
			 */
			howlong = timeouts->when - cur_time;
			if (howlong > INT_MAX / 1000)
				howlong = INT_MAX / 1000;
			to_msec = howlong * 1000;
		} else
			to_msec = -1;

		/* Set up the descriptors to be polled. */
		if (!ifi || ifi->rfdesc == -1)
			error("No live interface to poll on");

		fds[0].fd = ifi->rfdesc;
		fds[1].fd = routefd; /* Could be -1, which will be ignored. */
		fds[0].events = fds[1].events = POLLIN;

		/* Wait for a packet or a timeout... XXX */
		count = poll(fds, 2, to_msec);

		/* Get the current time... */
		time(&cur_time);

		/* Not likely to be transitory... */
		if (count == -1) {
			if (errno == EAGAIN || errno == EINTR) {
				continue;
			} else
				error("poll: %m");
		}

		if ((fds[0].revents & (POLLIN | POLLHUP))) {
			if (ifi && ifi->linkstat && ifi->rfdesc != -1)
				got_one();
		}
		if ((fds[1].revents & (POLLIN | POLLHUP))) {
			if (ifi && !interfaces_invalidated)
				routehandler();
		}

		interfaces_invalidated = 0;
	} while (1);
}

void
got_one(void)
{
	struct sockaddr_in from;
	struct hardware hfrom;
	struct iaddr ifrom;
	ssize_t result;

	if ((result = receive_packet(&from, &hfrom)) == -1) {
		warning("receive_packet failed on %s: %s", ifi->name,
		    strerror(errno));
		ifi->errors++;
		if ((!interface_status(ifi->name)) ||
		    (ifi->noifmedia && ifi->errors > 20)) {
			/* our interface has gone away. */
			error("Interface %s no longer appears valid.",
			    ifi->name);
		}
		return;
	}
	if (result == 0)
		return;

	ifrom.len = 4;
	memcpy(ifrom.iabuf, &from.sin_addr, ifrom.len);

	do_packet(result, from.sin_port, ifrom, &hfrom);
}

int
interface_link_forceup(char *ifname)
{
	struct ifreq ifr;
	int sock;

	if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
		error("Can't create socket");

	memset(&ifr, 0, sizeof(ifr));
	strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
	if (ioctl(sock, SIOCGIFFLAGS, (caddr_t)&ifr) == -1) {
		close(sock);
		return (-1);
	}

	if ((ifr.ifr_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
		ifr.ifr_flags |= IFF_UP;
		if (ioctl(sock, SIOCSIFFLAGS, (caddr_t)&ifr) == -1) {
			close(sock);
			return (-1);
		}
		close(sock);
		return (0);
	}
	close(sock);
	return (1);
}

int
interface_status(char *ifname)
{
	struct ifreq ifr;
	struct ifmediareq ifmr;
	int sock;

	if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
		error("Can't create socket");

	/* get interface flags */
	memset(&ifr, 0, sizeof(ifr));
	strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
	if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1) {
		error("ioctl(SIOCGIFFLAGS) on %s: %m", ifname);
	}

	/*
	 * if one of UP and RUNNING flags is dropped,
	 * the interface is not active.
	 */
	if ((ifr.ifr_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
		goto inactive;

	/* Next, check carrier on the interface, if possible */
	if (ifi->noifmedia)
		goto active;
	memset(&ifmr, 0, sizeof(ifmr));
	strlcpy(ifmr.ifm_name, ifname, sizeof(ifmr.ifm_name));
	if (ioctl(sock, SIOCGIFMEDIA, (caddr_t)&ifmr) == -1) {
		/*
		 * EINVAL or ENOTTY simply means that the interface
		 * does not support the SIOCGIFMEDIA ioctl. We regard it alive.
		 */
#ifdef DEBUG
		if (errno != EINVAL && errno != ENOTTY)
			debug("ioctl(SIOCGIFMEDIA) on %s: %m", ifname);
#endif
		ifi->noifmedia = 1;
		goto active;
	}
	if (ifmr.ifm_status & IFM_AVALID) {
		if (ifmr.ifm_status & IFM_ACTIVE)
			goto active;
		else
			goto inactive;
	}
inactive:
	close(sock);
	return (0);
active:
	close(sock);
	return (1);
}

void
add_timeout(time_t when, void (*where)(void))
{
	struct timeout *t, *q;

	/* See if this timeout supersedes an existing timeout. */
	t = NULL;
	for (q = timeouts; q; q = q->next) {
		if (q->func == where) {
			if (t)
				t->next = q->next;
			else
				timeouts = q->next;
			break;
		}
		t = q;
	}

	/* If we didn't supersede a timeout, allocate a timeout
	   structure now. */
	if (!q) {
		if (free_timeouts) {
			q = free_timeouts;
			free_timeouts = q->next;
			q->func = where;
		} else {
			q = malloc(sizeof(struct timeout));
			if (!q)
				error("Can't allocate timeout structure!");
			q->func = where;
		}
	}

	q->when = when;

	/* Now sort this timeout into the timeout list. */

	/* Beginning of list? */
	if (!timeouts || timeouts->when > q->when) {
		q->next = timeouts;
		timeouts = q;
		return;
	}

	/* Middle of list? */
	for (t = timeouts; t->next; t = t->next) {
		if (t->next->when > q->when) {
			q->next = t->next;
			t->next = q;
			return;
		}
	}

	/* End of list. */
	t->next = q;
	q->next = NULL;
}

void
cancel_timeout(void (*where)(void))
{
	struct timeout *t, *q;

	/* Look for this timeout on the list, and unlink it if we find it. */
	t = NULL;
	for (q = timeouts; q; q = q->next) {
		if (q->func == where) {
			if (t)
				t->next = q->next;
			else
				timeouts = q->next;
			break;
		}
		t = q;
	}

	/* If we found the timeout, put it on the free list. */
	if (q) {
		q->next = free_timeouts;
		free_timeouts = q;
	}
}

int
interface_link_status(char *ifname)
{
	struct ifmediareq ifmr;
	int sock;

	if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
		error("Can't create socket");

	memset(&ifmr, 0, sizeof(ifmr));
	strlcpy(ifmr.ifm_name, ifname, sizeof(ifmr.ifm_name));
	if (ioctl(sock, SIOCGIFMEDIA, (caddr_t)&ifmr) == -1) {
		/* EINVAL/ENOTTY -> link state unknown. treat as active */
#ifdef DEBUG
		if (errno != EINVAL && errno != ENOTTY)
			debug("ioctl(SIOCGIFMEDIA) on %s: %m", ifname);
#endif
		close(sock);
		return (1);
	}
	close(sock);

	if (ifmr.ifm_status & IFM_AVALID) {
		if (ifmr.ifm_status & IFM_ACTIVE)
			return (1);
		else
			return (0);
	}
	return (1);
}
Commit	Line	Data
f6c633e7	1	/* $OpenBSD: src/sbin/dhclient/dispatch.c,v 1.50 2012/06/22 01:01:59 krw Exp $ */
846204b6 HT	2
	3	/*
	4	* Copyright 2004 Henning Brauer <henning@openbsd.org>
	5	* Copyright (c) 1995, 1996, 1997, 1998, 1999
	6	* The Internet Software Consortium. All rights reserved.
	7	*
	8	* Redistribution and use in source and binary forms, with or without
	9	* modification, are permitted provided that the following conditions
	10	* are met:
	11	*
	12	* 1. Redistributions of source code must retain the above copyright
	13	* notice, this list of conditions and the following disclaimer.
	14	* 2. Redistributions in binary form must reproduce the above copyright
	15	* notice, this list of conditions and the following disclaimer in the
	16	* documentation and/or other materials provided with the distribution.
	17	* 3. Neither the name of The Internet Software Consortium nor the names
	18	* of its contributors may be used to endorse or promote products derived
	19	* from this software without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND
	22	* CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
	23	* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
	24	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	25	* DISCLAIMED. IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR
	26	* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	27	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	28	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
	29	* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
	30	* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
	31	* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
	32	* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	33	* SUCH DAMAGE.
	34	*
	35	* This software has been written for the Internet Software Consortium
	36	* by Ted Lemon <mellon@fugue.com> in cooperation with Vixie
	37	* Enterprises. To learn more about the Internet Software Consortium,
	38	* see ``http://www.vix.com/isc''. To learn more about Vixie
	39	* Enterprises, see ``http://www.vix.com''.
	40	*/
	41
	42	#include <sys/ioctl.h>
	43
	44	#include <net/if_media.h>
	45
	46	#include <ifaddrs.h>
	47	#include <poll.h>
	48
	49	#include "dhcpd.h"
	50
	51	struct timeout *timeouts;
	52	static struct timeout *free_timeouts;
	53	static int interfaces_invalidated;
	54
	55	/*
	56	* Use getifaddrs() to get a list of all the attached interfaces. For
	57	* each interface that's of type INET and not the loopback interface,
	58	* register that interface with the network I/O software, figure out
	59	* what subnet it's on, and add it to the list of interfaces.
	60	*/
	61	void
	62	discover_interface(void)
	63	{
	64	struct ifaddrs ifap, ifa;
	65	struct ifreq *tif;
66	int len = IFNAMSIZ + sizeof(struct sockaddr_storage);
67
68	if (getifaddrs(&ifap) != 0)
69	error("getifaddrs failed");
70
71	for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) {
72	if ((ifa->ifa_flags & IFF_LOOPBACK) \|\|
73	(ifa->ifa_flags & IFF_POINTOPOINT) \|\|
74	(!(ifa->ifa_flags & IFF_UP)))
75	continue;
76
77	if (strcmp(ifi->name, ifa->ifa_name))
78	continue;
79
80	/*
81	* If we have the capability, extract link information
82	* and record it in a linked list.
83	*/
84	if (ifa->ifa_addr->sa_family == AF_LINK) {
85	struct sockaddr_dl *foo =
86	(struct sockaddr_dl *)ifa->ifa_addr;
87
88	ifi->index = foo->sdl_index;
89	ifi->hw_address.hlen = foo->sdl_alen;
90	ifi->hw_address.htype = HTYPE_ETHER; /* XXX */
91	memcpy(ifi->hw_address.haddr,
92	LLADDR(foo), foo->sdl_alen);
93	}
94	if (!ifi->ifp) {
95	if ((tif = malloc(len)) == NULL)
96	error("no space to remember ifp");
97	strlcpy(tif->ifr_name, ifa->ifa_name, IFNAMSIZ);
98	ifi->ifp = tif;
99	}
100	}
101
102	if (!ifi->ifp)
103	error("%s: not found", ifi->name);
104
105	/* Register the interface... */
106	if_register_receive();
107	if_register_send();
108	freeifaddrs(ifap);
109	}
110
111	void
112	reinitialize_interface(void)
113	{
114	interfaces_invalidated = 1;
115	}
116
117	/*
118	* Wait for packets to come in using poll(). When a packet comes in, call
119	* receive_packet to receive the packet and possibly strip hardware addressing
120	* information from it, and then call do_packet to try to do something with it.
121	*/
122	void
123	dispatch(void)
124	{
125	int count, to_msec;
126	struct pollfd fds[2];
127	time_t howlong;
128
129	do {
130	/*
131	* Call any expired timeouts, and then if there's still
132	* a timeout registered, time out the select call then.
133	*/
134	another:
d19bab2e AHJ	135	if (!ifi)
	136	error("No interfaces available");
	137
846204b6 HT	138	if (!ifi->linkstat)
	139	interfaces_invalidated = 0;
	140
	141	if (timeouts) {
	142	struct timeout *t;
	143
	144	if (timeouts->when <= cur_time) {
	145	t = timeouts;
	146	timeouts = timeouts->next;
	147	(*(t->func))();
	148	t->next = free_timeouts;
	149	free_timeouts = t;
	150	goto another;
	151	}
	152
	153	/*
	154	* Figure timeout in milliseconds, and check for
	155	* potential overflow, so we can cram into an
	156	* int for poll, while not polling with a
	157	* negative timeout and blocking indefinitely.
	158	*/
	159	howlong = timeouts->when - cur_time;
	160	if (howlong > INT_MAX / 1000)
	161	howlong = INT_MAX / 1000;
	162	to_msec = howlong * 1000;
	163	} else
	164	to_msec = -1;
	165
	166	/* Set up the descriptors to be polled. */
	167	if (!ifi \|\| ifi->rfdesc == -1)
	168	error("No live interface to poll on");
	169
	170	fds[0].fd = ifi->rfdesc;
	171	fds[1].fd = routefd; /* Could be -1, which will be ignored. */
	172	fds[0].events = fds[1].events = POLLIN;
	173
	174	/* Wait for a packet or a timeout... XXX */
	175	count = poll(fds, 2, to_msec);
	176
	177	/* Get the current time... */
	178	time(&cur_time);
	179
	180	/* Not likely to be transitory... */
	181	if (count == -1) {
	182	if (errno == EAGAIN \|\| errno == EINTR) {
	183	continue;
	184	} else
	185	error("poll: %m");
	186	}
	187
	188	if ((fds[0].revents & (POLLIN \| POLLHUP))) {
bdf60627	189	if (ifi && ifi->linkstat && ifi->rfdesc != -1)
846204b6 HT	190	got_one();
	191	}
	192	if ((fds[1].revents & (POLLIN \| POLLHUP))) {
	193	if (ifi && !interfaces_invalidated)
	194	routehandler();
	195	}
	196
	197	interfaces_invalidated = 0;
	198	} while (1);
	199	}
	200
	201	void
	202	got_one(void)
	203	{
	204	struct sockaddr_in from;
	205	struct hardware hfrom;
	206	struct iaddr ifrom;
	207	ssize_t result;
	208
	209	if ((result = receive_packet(&from, &hfrom)) == -1) {
	210	warning("receive_packet failed on %s: %s", ifi->name,
	211	strerror(errno));
	212	ifi->errors++;
	213	if ((!interface_status(ifi->name)) \|\|
	214	(ifi->noifmedia && ifi->errors > 20)) {
	215	/* our interface has gone away. */
9930e9a8	216	error("Interface %s no longer appears valid.",
846204b6	217	ifi->name);
846204b6 HT	218	}
	219	return;
	220	}
	221	if (result == 0)
	222	return;
	223
	224	ifrom.len = 4;
	225	memcpy(ifrom.iabuf, &from.sin_addr, ifrom.len);
	226
	227	do_packet(result, from.sin_port, ifrom, &hfrom);
	228	}
	229
	230	int
	231	interface_link_forceup(char *ifname)
	232	{
	233	struct ifreq ifr;
	234	int sock;
	235
	236	if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
	237	error("Can't create socket");
	238
	239	memset(&ifr, 0, sizeof(ifr));
	240	strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
	241	if (ioctl(sock, SIOCGIFFLAGS, (caddr_t)&ifr) == -1) {
	242	close(sock);
	243	return (-1);
	244	}
	245
	246	if ((ifr.ifr_flags & (IFF_UP\|IFF_RUNNING)) != (IFF_UP\|IFF_RUNNING)) {
	247	ifr.ifr_flags \|= IFF_UP;
	248	if (ioctl(sock, SIOCSIFFLAGS, (caddr_t)&ifr) == -1) {
	249	close(sock);
	250	return (-1);
	251	}
	252	close(sock);
	253	return (0);
	254	}
	255	close(sock);
	256	return (1);
	257	}
	258
846204b6 HT	259	int
	260	interface_status(char *ifname)
	261	{
	262	struct ifreq ifr;
	263	struct ifmediareq ifmr;
	264	int sock;
	265
	266	if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
	267	error("Can't create socket");
	268
	269	/* get interface flags */
	270	memset(&ifr, 0, sizeof(ifr));
	271	strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
f6c633e7	272	if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1) {
9930e9a8	273	error("ioctl(SIOCGIFFLAGS) on %s: %m", ifname);
846204b6 HT	274	}
	275
	276	/*
	277	* if one of UP and RUNNING flags is dropped,
	278	* the interface is not active.
	279	*/
	280	if ((ifr.ifr_flags & (IFF_UP\|IFF_RUNNING)) != (IFF_UP\|IFF_RUNNING))
	281	goto inactive;
	282
	283	/* Next, check carrier on the interface, if possible */
	284	if (ifi->noifmedia)
	285	goto active;
	286	memset(&ifmr, 0, sizeof(ifmr));
	287	strlcpy(ifmr.ifm_name, ifname, sizeof(ifmr.ifm_name));
f6c633e7	288	if (ioctl(sock, SIOCGIFMEDIA, (caddr_t)&ifmr) == -1) {
846204b6 HT	289	/*
	290	* EINVAL or ENOTTY simply means that the interface
	291	* does not support the SIOCGIFMEDIA ioctl. We regard it alive.
	292	*/
4cada237	293	#ifdef DEBUG
846204b6 HT	294	if (errno != EINVAL && errno != ENOTTY)
846204b6 HT	295	debug("ioctl(SIOCGIFMEDIA) on %s: %m", ifname);
4cada237	296	#endif
846204b6 HT	297	ifi->noifmedia = 1;
	298	goto active;
	299	}
	300	if (ifmr.ifm_status & IFM_AVALID) {
	301	if (ifmr.ifm_status & IFM_ACTIVE)
	302	goto active;
	303	else
	304	goto inactive;
	305	}
	306	inactive:
	307	close(sock);
	308	return (0);
	309	active:
	310	close(sock);
	311	return (1);
	312	}
	313
	314	void
	315	add_timeout(time_t when, void (*where)(void))
	316	{
	317	struct timeout t, q;
	318
	319	/* See if this timeout supersedes an existing timeout. */
	320	t = NULL;
	321	for (q = timeouts; q; q = q->next) {
	322	if (q->func == where) {
	323	if (t)
	324	t->next = q->next;
	325	else
	326	timeouts = q->next;
	327	break;
	328	}
	329	t = q;
	330	}
	331
	332	/* If we didn't supersede a timeout, allocate a timeout
	333	structure now. */
	334	if (!q) {
	335	if (free_timeouts) {
	336	q = free_timeouts;
	337	free_timeouts = q->next;
	338	q->func = where;
	339	} else {
	340	q = malloc(sizeof(struct timeout));
	341	if (!q)
	342	error("Can't allocate timeout structure!");
	343	q->func = where;
	344	}
	345	}
	346
	347	q->when = when;
	348
	349	/* Now sort this timeout into the timeout list. */
	350
	351	/* Beginning of list? */
	352	if (!timeouts \|\| timeouts->when > q->when) {
	353	q->next = timeouts;
	354	timeouts = q;
	355	return;
	356	}
	357
	358	/* Middle of list? */
	359	for (t = timeouts; t->next; t = t->next) {
	360	if (t->next->when > q->when) {
361	q->next = t->next;
362	t->next = q;
363	return;
364	}
365	}
366
367	/* End of list. */
368	t->next = q;
369	q->next = NULL;
370	}
371
372	void
373	cancel_timeout(void (*where)(void))
374	{
375	struct timeout t, q;
376
377	/* Look for this timeout on the list, and unlink it if we find it. */
378	t = NULL;
379	for (q = timeouts; q; q = q->next) {
380	if (q->func == where) {
381	if (t)
382	t->next = q->next;
383	else
384	timeouts = q->next;
385	break;
386	}
387	t = q;
388	}
389
390	/* If we found the timeout, put it on the free list. */
391	if (q) {
392	q->next = free_timeouts;
393	free_timeouts = q;
394	}
395	}
396
397	int
398	interface_link_status(char *ifname)
399	{
400	struct ifmediareq ifmr;
401	int sock;
402
403	if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
404	error("Can't create socket");
405
406	memset(&ifmr, 0, sizeof(ifmr));
407	strlcpy(ifmr.ifm_name, ifname, sizeof(ifmr.ifm_name));
408	if (ioctl(sock, SIOCGIFMEDIA, (caddr_t)&ifmr) == -1) {
409	/* EINVAL/ENOTTY -> link state unknown. treat as active */
4cada237	410	#ifdef DEBUG
846204b6 HT	411	if (errno != EINVAL && errno != ENOTTY)
846204b6 HT	412	debug("ioctl(SIOCGIFMEDIA) on %s: %m", ifname);
4cada237	413	#endif
846204b6 HT	414	close(sock);
	415	return (1);
	416	}
	417	close(sock);
	418
	419	if (ifmr.ifm_status & IFM_AVALID) {
	420	if (ifmr.ifm_status & IFM_ACTIVE)
	421	return (1);
	422	else
	423	return (0);
	424	}
	425	return (1);
	426	}