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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	sbin/dhclient/dispatch.c	Lines:	0	127	0.0 %
Date:	2016-12-06	Branches:	0	76	0.0 %


/*	$OpenBSD: dispatch.c,v 1.106 2016/07/21 09:58:55 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 <sys/queue.h>
#include <sys/socket.h>
#include <sys/types.h>

#include <net/if.h>
#include <net/if_arp.h>
#include <net/if_dl.h>
#include <net/if_media.h>
#include <net/if_types.h>

#include <netinet/in.h>
#include <netinet/if_ether.h>

#include <errno.h>
#include <ifaddrs.h>
#include <imsg.h>
#include <limits.h>
#include <poll.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "dhcp.h"
#include "dhcpd.h"
#include "privsep.h"


struct dhcp_timeout timeout;

void packethandler(void);

void
get_hw_address(void)
{
	struct ifaddrs *ifap, *ifa;
	struct sockaddr_dl *sdl;
	int found;

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

	found = 0;
	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) != 0)
			continue;
		found = 1;

		if (ifa->ifa_addr->sa_family != AF_LINK)
			continue;

		sdl = (struct sockaddr_dl *)ifa->ifa_addr;
		if (sdl->sdl_type != IFT_ETHER ||
		    sdl->sdl_alen != ETHER_ADDR_LEN)
			continue;

		memcpy(ifi->hw_address.ether_addr_octet, LLADDR(sdl),
		    ETHER_ADDR_LEN);
		ifi->flags |= IFI_VALID_LLADDR;
	}

	if (!found)
		error("%s: no such interface", ifi->name);

	freeifaddrs(ifap);
}

/*
 * Loop waiting for packets, timeouts or routing messages.
 */
void
dispatch(void)
{
	int count, to_msec;
	struct pollfd fds[3];
	time_t cur_time, howlong;
	void (*func)(void);

	while (quit == 0) {
		if (timeout.func) {
			time(&cur_time);
			if (timeout.when <= cur_time) {
				func = timeout.func;
				cancel_timeout();
				(*(func))();
				continue;
			}
			/*
			 * 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 = timeout.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.
		 *
		 *  fds[0] == bpf socket for incoming packets
		 *  fds[1] == routing socket for incoming RTM messages
		 *  fds[2] == imsg socket to privileged process
		*/
		fds[0].fd = ifi->bfdesc;
		fds[1].fd = routefd;
		fds[2].fd = unpriv_ibuf->fd;
		fds[0].events = fds[1].events = fds[2].events = POLLIN;

		if (unpriv_ibuf->w.queued)
			fds[2].events |= POLLOUT;

		count = poll(fds, 3, to_msec);
		if (count == -1) {
			if (errno == EAGAIN || errno == EINTR) {
				continue;
			} else {
				warning("poll: %s", strerror(errno));
				quit = INTERNALSIG;
				continue;
			}
		}

		if ((fds[0].revents & (POLLIN | POLLHUP)))
			packethandler();
		if ((fds[1].revents & (POLLIN | POLLHUP)))
			routehandler();
		if (fds[2].revents & POLLOUT)
			flush_unpriv_ibuf("dispatch");
		if ((fds[2].revents & (POLLIN | POLLHUP))) {
			/* Pipe to [priv] closed. Assume it emitted error. */
			quit = INTERNALSIG;
		}
	}

	if (quit == SIGHUP) {
		/* Tell [priv] process that HUP has occurred. */
		sendhup(client->active);
		warning("%s; restarting", strsignal(quit));
		exit (0);
	} else if (quit != INTERNALSIG) {
		warning("%s; exiting", strsignal(quit));
		exit(1);
	}
}

void
packethandler(void)
{
	struct sockaddr_in from;
	struct ether_addr hfrom;
	struct in_addr ifrom;
	ssize_t result;

	if ((result = receive_packet(&from, &hfrom)) == -1) {
		warning("%s receive_packet failed: %s", ifi->name,
		    strerror(errno));
		ifi->errors++;
		if (ifi->errors > 20) {
			error("%s too many receive_packet failures; exiting",
			    ifi->name);
		}
		return;
	}
	ifi->errors = 0;

	if (result == 0)
		return;

	ifrom.s_addr = from.sin_addr.s_addr;

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

void
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) {
		note("interface_link_forceup: SIOCGIFFLAGS failed (%s)",
		    strerror(errno));
		close(sock);
		return;
	}

	/* Force it down and up so others notice link state change. */
	ifr.ifr_flags &= ~IFF_UP;
	if (ioctl(sock, SIOCSIFFLAGS, (caddr_t)&ifr) == -1) {
		note("interface_link_forceup: SIOCSIFFLAGS DOWN failed (%s)",
		    strerror(errno));
		close(sock);
		return;
	}

	ifr.ifr_flags |= IFF_UP;
	if (ioctl(sock, SIOCSIFFLAGS, (caddr_t)&ifr) == -1) {
		note("interface_link_forceup: SIOCSIFFLAGS UP failed (%s)",
		    strerror(errno));
		close(sock);
		return;
	}

	close(sock);
}

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: %s", ifname,
		    strerror(errno));
	}

	if ((ifr.ifr_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
		goto inactive;

	/* Next, check carrier on the interface if possible. */
	if (ifi->flags & IFI_NOMEDIA)
		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: %s", ifname,
			    strerror(errno));
#endif

		ifi->flags |= IFI_NOMEDIA;
		goto active;
	}
	if (ifmr.ifm_status & IFM_AVALID) {
		if (ifmr.ifm_status & IFM_ACTIVE)
			goto active;
		else
			goto inactive;
	}

	/* Assume 'active' if IFM_AVALID is not set. */

active:
	close(sock);
	return (1);
inactive:
	close(sock);
	return (0);
}

void
set_timeout(time_t when, void (*where)(void))
{
	timeout.when = when;
	timeout.func = where;
}

void
set_timeout_interval(time_t secs, void (*where)(void))
{
	timeout.when = time(NULL) + secs;
	timeout.func = where;
}

void
cancel_timeout(void)
{
	timeout.when = 0;
	timeout.func = NULL;
}

int
get_rdomain(char *name)
{
	int rv = 0, s;
	struct ifreq ifr;

	if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
	    error("get_rdomain socket: %s", strerror(errno));

	memset(&ifr, 0, sizeof(ifr));
	strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
	if (ioctl(s, SIOCGIFRDOMAIN, (caddr_t)&ifr) != -1)
	    rv = ifr.ifr_rdomainid;

	close(s);
	return rv;
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: dispatch.c,v 1.106 2016/07/21 09:58:55 krw Exp $ */
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			#include <sys/queue.h>
44			#include <sys/socket.h>
45			#include <sys/types.h>
46
47			#include <net/if.h>
48			#include <net/if_arp.h>
49			#include <net/if_dl.h>
50			#include <net/if_media.h>
51			#include <net/if_types.h>
52
53			#include <netinet/in.h>
54			#include <netinet/if_ether.h>
55
56			#include <errno.h>
57			#include <ifaddrs.h>
58			#include <imsg.h>
59			#include <limits.h>
60			#include <poll.h>
61			#include <signal.h>
62			#include <stdio.h>
63			#include <stdlib.h>
64			#include <string.h>
65			#include <unistd.h>
66
67			#include "dhcp.h"
68			#include "dhcpd.h"
69			#include "privsep.h"
70
71
72			struct dhcp_timeout timeout;
73
74			void packethandler(void);
75
76			void
77			get_hw_address(void)
78			{
79			struct ifaddrs ifap, ifa;
80			struct sockaddr_dl *sdl;
81			int found;
82
83			if (getifaddrs(&ifap) != 0)
84			error("getifaddrs failed");
85
86			found = 0;
87			for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) {
88			if ((ifa->ifa_flags & IFF_LOOPBACK) \|\|
89			(ifa->ifa_flags & IFF_POINTOPOINT) \|\|
90			(!(ifa->ifa_flags & IFF_UP)))
91			continue;
92
93			if (strcmp(ifi->name, ifa->ifa_name) != 0)
94			continue;
95			found = 1;
96
97			if (ifa->ifa_addr->sa_family != AF_LINK)
98			continue;
99
100			sdl = (struct sockaddr_dl *)ifa->ifa_addr;
101			if (sdl->sdl_type != IFT_ETHER \|\|
102			sdl->sdl_alen != ETHER_ADDR_LEN)
103			continue;
104
105			memcpy(ifi->hw_address.ether_addr_octet, LLADDR(sdl),
106			ETHER_ADDR_LEN);
107			ifi->flags \|= IFI_VALID_LLADDR;
108			}
109
110			if (!found)
111			error("%s: no such interface", ifi->name);
112
113			freeifaddrs(ifap);
114			}
115
116			/*
117			* Loop waiting for packets, timeouts or routing messages.
118			*/
119			void
120			dispatch(void)
121			{
122			int count, to_msec;
123			struct pollfd fds[3];
124			time_t cur_time, howlong;
125			void (*func)(void);
126
127			while (quit == 0) {
128			if (timeout.func) {
129			time(&cur_time);
130			if (timeout.when <= cur_time) {
131			func = timeout.func;
132			cancel_timeout();
133			(*(func))();
134			continue;
135			}
136			/*
137			* Figure timeout in milliseconds, and check for
138			* potential overflow, so we can cram into an
139			* int for poll, while not polling with a
140			* negative timeout and blocking indefinitely.
141			*/
142			howlong = timeout.when - cur_time;
143			if (howlong > INT_MAX / 1000)
144			howlong = INT_MAX / 1000;
145			to_msec = howlong * 1000;
146			} else
147			to_msec = -1;
148
149			/*
150			* Set up the descriptors to be polled.
151			*
152			* fds[0] == bpf socket for incoming packets
153			* fds[1] == routing socket for incoming RTM messages
154			* fds[2] == imsg socket to privileged process
155			*/
156			fds[0].fd = ifi->bfdesc;
157			fds[1].fd = routefd;
158			fds[2].fd = unpriv_ibuf->fd;
159			fds[0].events = fds[1].events = fds[2].events = POLLIN;
160
161			if (unpriv_ibuf->w.queued)
162			fds[2].events \|= POLLOUT;
163
164			count = poll(fds, 3, to_msec);
165			if (count == -1) {
166			if (errno == EAGAIN \|\| errno == EINTR) {
167			continue;
168			} else {
169			warning("poll: %s", strerror(errno));
170			quit = INTERNALSIG;
171			continue;
172			}
173			}
174
175			if ((fds[0].revents & (POLLIN \| POLLHUP)))
176			packethandler();
177			if ((fds[1].revents & (POLLIN \| POLLHUP)))
178			routehandler();
179			if (fds[2].revents & POLLOUT)
180			flush_unpriv_ibuf("dispatch");
181			if ((fds[2].revents & (POLLIN \| POLLHUP))) {
182			/* Pipe to [priv] closed. Assume it emitted error. */
183			quit = INTERNALSIG;
184			}
185			}
186
187			if (quit == SIGHUP) {
188			/* Tell [priv] process that HUP has occurred. */
189			sendhup(client->active);
190			warning("%s; restarting", strsignal(quit));
191			exit (0);
192			} else if (quit != INTERNALSIG) {
193			warning("%s; exiting", strsignal(quit));
194			exit(1);
195			}
196			}
197
198			void
199			packethandler(void)
200			{
201			struct sockaddr_in from;
202			struct ether_addr hfrom;
203			struct in_addr ifrom;
204			ssize_t result;
205
206			if ((result = receive_packet(&from, &hfrom)) == -1) {
207			warning("%s receive_packet failed: %s", ifi->name,
208			strerror(errno));
209			ifi->errors++;
210			if (ifi->errors > 20) {
211			error("%s too many receive_packet failures; exiting",
212			ifi->name);
213			}
214			return;
215			}
216			ifi->errors = 0;
217
218			if (result == 0)
219			return;
220
221			ifrom.s_addr = from.sin_addr.s_addr;
222
223			do_packet(from.sin_port, ifrom, &hfrom);
224			}
225
226			void
227			interface_link_forceup(char *ifname)
228			{
229			struct ifreq ifr;
230			int sock;
231
232			if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
233			error("Can't create socket");
234
235			memset(&ifr, 0, sizeof(ifr));
236			strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
237			if (ioctl(sock, SIOCGIFFLAGS, (caddr_t)&ifr) == -1) {
238			note("interface_link_forceup: SIOCGIFFLAGS failed (%s)",
239			strerror(errno));
240			close(sock);
241			return;
242			}
243
244			/* Force it down and up so others notice link state change. */
245			ifr.ifr_flags &= ~IFF_UP;
246			if (ioctl(sock, SIOCSIFFLAGS, (caddr_t)&ifr) == -1) {
247			note("interface_link_forceup: SIOCSIFFLAGS DOWN failed (%s)",
248			strerror(errno));
249			close(sock);
250			return;
251			}
252
253			ifr.ifr_flags \|= IFF_UP;
254			if (ioctl(sock, SIOCSIFFLAGS, (caddr_t)&ifr) == -1) {
255			note("interface_link_forceup: SIOCSIFFLAGS UP failed (%s)",
256			strerror(errno));
257			close(sock);
258			return;
259			}
260
261			close(sock);
262			}
263
264			int
265			interface_status(char *ifname)
266			{
267			struct ifreq ifr;
268			struct ifmediareq ifmr;
269			int sock;
270
271			if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
272			error("Can't create socket");
273
274			/* Get interface flags. */
275			memset(&ifr, 0, sizeof(ifr));
276			strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
277			if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1) {
278			error("ioctl(SIOCGIFFLAGS) on %s: %s", ifname,
279			strerror(errno));
280			}
281
282			if ((ifr.ifr_flags & (IFF_UP\|IFF_RUNNING)) != (IFF_UP\|IFF_RUNNING))
283			goto inactive;
284
285			/* Next, check carrier on the interface if possible. */
286			if (ifi->flags & IFI_NOMEDIA)
287			goto active;
288			memset(&ifmr, 0, sizeof(ifmr));
289			strlcpy(ifmr.ifm_name, ifname, sizeof(ifmr.ifm_name));
290			if (ioctl(sock, SIOCGIFMEDIA, (caddr_t)&ifmr) == -1) {
291			/*
292			* EINVAL or ENOTTY simply means that the interface does not
293			* support the SIOCGIFMEDIA ioctl. We regard it alive.
294			*/
295			#ifdef DEBUG
296			if (errno != EINVAL && errno != ENOTTY)
297			debug("ioctl(SIOCGIFMEDIA) on %s: %s", ifname,
298			strerror(errno));
299			#endif
300
301			ifi->flags \|= IFI_NOMEDIA;
302			goto active;
303			}
304			if (ifmr.ifm_status & IFM_AVALID) {
305			if (ifmr.ifm_status & IFM_ACTIVE)
306			goto active;
307			else
308			goto inactive;
309			}
310
311			/* Assume 'active' if IFM_AVALID is not set. */
312
313			active:
314			close(sock);
315			return (1);
316			inactive:
317			close(sock);
318			return (0);
319			}
320
321			void
322			set_timeout(time_t when, void (*where)(void))
323			{
324			timeout.when = when;
325			timeout.func = where;
326			}
327
328			void
329			set_timeout_interval(time_t secs, void (*where)(void))
330			{
331			timeout.when = time(NULL) + secs;
332			timeout.func = where;
333			}
334
335			void
336			cancel_timeout(void)
337			{
338			timeout.when = 0;
339			timeout.func = NULL;
340			}
341
342			int
343			get_rdomain(char *name)
344			{
345			int rv = 0, s;
346			struct ifreq ifr;
347
348			if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
349			error("get_rdomain socket: %s", strerror(errno));
350
351			memset(&ifr, 0, sizeof(ifr));
352			strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
353			if (ioctl(s, SIOCGIFRDOMAIN, (caddr_t)&ifr) != -1)
354			rv = ifr.ifr_rdomainid;
355
356			close(s);
357			return rv;
358			}