1 /* $OpenBSD: src/sbin/dhclient/dispatch.c,v 1.53 2012/07/26 18:42:58 krw Exp $ */
4 * Copyright 2004 Henning Brauer <henning@openbsd.org>
5 * Copyright (c) 1995, 1996, 1997, 1998, 1999
6 * The Internet Software Consortium. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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
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''.
42 #include <sys/ioctl.h>
44 #include <net/if_media.h>
51 struct timeout timeout;
52 static int interfaces_invalidated;
55 * Use getifaddrs() to get a list of all the attached interfaces. For
56 * each interface that's of type INET and not the loopback interface,
57 * register that interface with the network I/O software, figure out
58 * what subnet it's on, and add it to the list of interfaces.
61 discover_interface(void)
63 struct ifaddrs *ifap, *ifa;
65 int len = IFNAMSIZ + sizeof(struct sockaddr_storage);
67 if (getifaddrs(&ifap) != 0)
68 error("getifaddrs failed");
70 for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) {
71 if ((ifa->ifa_flags & IFF_LOOPBACK) ||
72 (ifa->ifa_flags & IFF_POINTOPOINT) ||
73 (!(ifa->ifa_flags & IFF_UP)))
76 if (strcmp(ifi->name, ifa->ifa_name))
80 * If we have the capability, extract link information
81 * and record it in a linked list.
83 if (ifa->ifa_addr->sa_family == AF_LINK) {
84 struct sockaddr_dl *foo =
85 (struct sockaddr_dl *)ifa->ifa_addr;
87 ifi->index = foo->sdl_index;
88 ifi->hw_address.hlen = foo->sdl_alen;
89 ifi->hw_address.htype = HTYPE_ETHER; /* XXX */
90 memcpy(ifi->hw_address.haddr,
91 LLADDR(foo), foo->sdl_alen);
94 if ((tif = malloc(len)) == NULL)
95 error("no space to remember ifp");
96 strlcpy(tif->ifr_name, ifa->ifa_name, IFNAMSIZ);
102 error("%s: not found", ifi->name);
104 /* Register the interface... */
105 if_register_receive();
111 reinitialize_interface(void)
113 interfaces_invalidated = 1;
117 * Wait for packets to come in using poll(). When a packet comes in, call
118 * receive_packet to receive the packet and possibly strip hardware addressing
119 * information from it, and then call do_packet to try to do something with it.
125 struct pollfd fds[2];
131 * Call expired timeout, and then if there's still
132 * a timeout registered, time out the select call then.
136 error("No interfaces available");
139 interfaces_invalidated = 0;
143 if (timeout.when <= cur_time) {
150 * Figure timeout in milliseconds, and check for
151 * potential overflow, so we can cram into an
152 * int for poll, while not polling with a
153 * negative timeout and blocking indefinitely.
155 howlong = timeout.when - cur_time;
156 if (howlong > INT_MAX / 1000)
157 howlong = INT_MAX / 1000;
158 to_msec = howlong * 1000;
162 /* Set up the descriptors to be polled. */
163 if (!ifi || ifi->rfdesc == -1)
164 error("No live interface to poll on");
166 fds[0].fd = ifi->rfdesc;
167 fds[1].fd = routefd; /* Could be -1, which will be ignored. */
168 fds[0].events = fds[1].events = POLLIN;
170 /* Wait for a packet or a timeout... XXX */
171 count = poll(fds, 2, to_msec);
173 /* Not likely to be transitory... */
175 if (errno == EAGAIN || errno == EINTR) {
181 if ((fds[0].revents & (POLLIN | POLLHUP))) {
182 if (ifi && ifi->linkstat && ifi->rfdesc != -1)
185 if ((fds[1].revents & (POLLIN | POLLHUP))) {
186 if (ifi && !interfaces_invalidated)
190 interfaces_invalidated = 0;
197 struct sockaddr_in from;
198 struct hardware hfrom;
202 if ((result = receive_packet(&from, &hfrom)) == -1) {
203 warning("receive_packet failed on %s: %s", ifi->name,
206 if ((!interface_status(ifi->name)) ||
207 (ifi->noifmedia && ifi->errors > 20)) {
208 /* our interface has gone away. */
209 error("Interface %s no longer appears valid.",
218 memcpy(ifrom.iabuf, &from.sin_addr, ifrom.len);
220 do_packet(result, from.sin_port, ifrom, &hfrom);
224 interface_link_forceup(char *ifname)
229 if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
230 error("Can't create socket");
232 memset(&ifr, 0, sizeof(ifr));
233 strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
234 if (ioctl(sock, SIOCGIFFLAGS, (caddr_t)&ifr) == -1) {
239 if ((ifr.ifr_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
240 ifr.ifr_flags |= IFF_UP;
241 if (ioctl(sock, SIOCSIFFLAGS, (caddr_t)&ifr) == -1) {
253 interface_status(char *ifname)
256 struct ifmediareq ifmr;
259 if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
260 error("Can't create socket");
262 /* get interface flags */
263 memset(&ifr, 0, sizeof(ifr));
264 strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
265 if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1) {
266 error("ioctl(SIOCGIFFLAGS) on %s: %m", ifname);
270 * if one of UP and RUNNING flags is dropped,
271 * the interface is not active.
273 if ((ifr.ifr_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
276 /* Next, check carrier on the interface, if possible */
279 memset(&ifmr, 0, sizeof(ifmr));
280 strlcpy(ifmr.ifm_name, ifname, sizeof(ifmr.ifm_name));
281 if (ioctl(sock, SIOCGIFMEDIA, (caddr_t)&ifmr) == -1) {
283 * EINVAL or ENOTTY simply means that the interface
284 * does not support the SIOCGIFMEDIA ioctl. We regard it alive.
287 if (errno != EINVAL && errno != ENOTTY)
288 debug("ioctl(SIOCGIFMEDIA) on %s: %m", ifname);
293 if (ifmr.ifm_status & IFM_AVALID) {
294 if (ifmr.ifm_status & IFM_ACTIVE)
300 /* Assume 'active' if IFM_AVALID is not set. */
311 set_timeout(time_t when, void (*where)(void))
314 timeout.func = where;