Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	sbin/slaacd/control.c	Lines:	5	127	3.9 %
Date:	2017-11-13	Branches:	1	72	1.4 %


/*	$OpenBSD: control.c,v 1.1 2017/06/03 10:00:29 florian Exp $	*/

/*
 * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <sys/un.h>

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

#include <errno.h>
#include <event.h>
#include <imsg.h>
#include <md5.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "log.h"
#include "slaacd.h"
#include "control.h"
#include "frontend.h"

#define	CONTROL_BACKLOG	5

struct ctl_conn	*control_connbyfd(int);
struct ctl_conn	*control_connbypid(pid_t);
void		 control_close(int);

int
control_init(char *path)
{
	struct sockaddr_un	 sun;
	int			 fd;
	mode_t			 old_umask;

	if ((fd = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
	    0)) == -1) {
		log_warn("%s: socket", __func__);
		return (-1);
	}

	memset(&sun, 0, sizeof(sun));
	sun.sun_family = AF_UNIX;
	strlcpy(sun.sun_path, path, sizeof(sun.sun_path));

	if (unlink(path) == -1)
		if (errno != ENOENT) {
			log_warn("%s: unlink %s", __func__, path);
			close(fd);
			return (-1);
		}

	old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
	if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
		log_warn("%s: bind: %s", __func__, path);
		close(fd);
		umask(old_umask);
		return (-1);
	}
	umask(old_umask);

	if (chmod(path, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) == -1) {
		log_warn("%s: chmod", __func__);
		close(fd);
		(void)unlink(path);
		return (-1);
	}

	control_state.fd = fd;

	return (0);
}

int
control_listen(void)
{

	if (listen(control_state.fd, CONTROL_BACKLOG) == -1) {
		log_warn("%s: listen", __func__);
		return (-1);
	}

	event_set(&control_state.ev, control_state.fd, EV_READ,
	    control_accept, NULL);
	event_add(&control_state.ev, NULL);
	evtimer_set(&control_state.evt, control_accept, NULL);

	return (0);
}

void
control_cleanup(char *path)
{
	if (path == NULL)
		return;
	event_del(&control_state.ev);
	event_del(&control_state.evt);
	unlink(path);
}

void
control_accept(int listenfd, short event, void *bula)
{
	int			 connfd;
	socklen_t		 len;
	struct sockaddr_un	 sun;
	struct ctl_conn		*c;

	event_add(&control_state.ev, NULL);
	if ((event & EV_TIMEOUT))
		return;

	len = sizeof(sun);
	if ((connfd = accept4(listenfd, (struct sockaddr *)&sun, &len,
	    SOCK_CLOEXEC | SOCK_NONBLOCK)) == -1) {
		/*
		 * Pause accept if we are out of file descriptors, or
		 * libevent will haunt us here too.
		 */
		if (errno == ENFILE || errno == EMFILE) {
			struct timeval evtpause = { 1, 0 };

			event_del(&control_state.ev);
			evtimer_add(&control_state.evt, &evtpause);
		} else if (errno != EWOULDBLOCK && errno != EINTR &&
		    errno != ECONNABORTED)
			log_warn("%s: accept4", __func__);
		return;
	}

	if ((c = calloc(1, sizeof(struct ctl_conn))) == NULL) {
		log_warn("%s: calloc", __func__);
		close(connfd);
		return;
	}

	imsg_init(&c->iev.ibuf, connfd);
	c->iev.handler = control_dispatch_imsg;
	c->iev.events = EV_READ;
	event_set(&c->iev.ev, c->iev.ibuf.fd, c->iev.events,
	    c->iev.handler, &c->iev);
	event_add(&c->iev.ev, NULL);

	TAILQ_INSERT_TAIL(&ctl_conns, c, entry);
}

struct ctl_conn *
control_connbyfd(int fd)
{
	struct ctl_conn	*c;

	TAILQ_FOREACH(c, &ctl_conns, entry) {
		if (c->iev.ibuf.fd == fd)
			break;
	}

	return (c);
}

struct ctl_conn *
control_connbypid(pid_t pid)
{
	struct ctl_conn	*c;

	TAILQ_FOREACH(c, &ctl_conns, entry) {
		if (c->iev.ibuf.pid == pid)
			break;
	}

	return (c);
}

void
control_close(int fd)
{
	struct ctl_conn	*c;

	if ((c = control_connbyfd(fd)) == NULL) {
		log_warnx("%s: fd %d: not found", __func__, fd);
		return;
	}

	msgbuf_clear(&c->iev.ibuf.w);
	TAILQ_REMOVE(&ctl_conns, c, entry);

	event_del(&c->iev.ev);
	close(c->iev.ibuf.fd);

	/* Some file descriptors are available again. */
	if (evtimer_pending(&control_state.evt, NULL)) {
		evtimer_del(&control_state.evt);
		event_add(&control_state.ev, NULL);
	}

	free(c);
}

void
control_dispatch_imsg(int fd, short event, void *bula)
{
	struct ctl_conn	*c;
	struct imsg	 imsg;
	ssize_t		 n;
	int		 verbose;

	if ((c = control_connbyfd(fd)) == NULL) {
		log_warnx("%s: fd %d: not found", __func__, fd);
		return;
	}

	if (event & EV_READ) {
		if (((n = imsg_read(&c->iev.ibuf)) == -1 && errno != EAGAIN) ||
		    n == 0) {
			control_close(fd);
			return;
		}
	}
	if (event & EV_WRITE) {
		if (msgbuf_write(&c->iev.ibuf.w) <= 0 && errno != EAGAIN) {
			control_close(fd);
			return;
		}
	}

	for (;;) {
		if ((n = imsg_get(&c->iev.ibuf, &imsg)) == -1) {
			control_close(fd);
			return;
		}
		if (n == 0)
			break;

		switch (imsg.hdr.type) {
		case IMSG_CTL_LOG_VERBOSE:
			if (imsg.hdr.len != IMSG_HEADER_SIZE +
			    sizeof(verbose))
				break;

			/* Forward to all other processes. */
			frontend_imsg_compose_main(imsg.hdr.type, imsg.hdr.pid,
			    imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE);
			frontend_imsg_compose_engine(imsg.hdr.type, 0,
			    imsg.hdr.pid, imsg.data,
			    imsg.hdr.len - IMSG_HEADER_SIZE);

			memcpy(&verbose, imsg.data, sizeof(verbose));
			log_setverbose(verbose);
			break;
		case IMSG_CTL_SHOW_INTERFACE_INFO:
			c->iev.ibuf.pid = imsg.hdr.pid;
			frontend_imsg_compose_engine(imsg.hdr.type, 0,
			    imsg.hdr.pid, imsg.data, imsg.hdr.len -
			    IMSG_HEADER_SIZE);
			break;
		case IMSG_CTL_SEND_SOLICITATION:
			c->iev.ibuf.pid = imsg.hdr.pid;
			frontend_imsg_compose_engine(imsg.hdr.type, 0,
			    imsg.hdr.pid, imsg.data, imsg.hdr.len -
			    IMSG_HEADER_SIZE);
			break;
		default:
			log_debug("%s: error handling imsg %d", __func__,
			    imsg.hdr.type);
			break;
		}
		imsg_free(&imsg);
	}

	imsg_event_add(&c->iev);
}

int
control_imsg_relay(struct imsg *imsg)
{
	struct ctl_conn	*c;

	if ((c = control_connbypid(imsg->hdr.pid)) == NULL)
		return (0);

	return (imsg_compose_event(&c->iev, imsg->hdr.type, 0, imsg->hdr.pid,
	    -1, imsg->data, imsg->hdr.len - IMSG_HEADER_SIZE));
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: control.c,v 1.1 2017/06/03 10:00:29 florian Exp $ */
2
3			/*
4			* Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
5			*
6			* Permission to use, copy, modify, and distribute this software for any
7			* purpose with or without fee is hereby granted, provided that the above
8			* copyright notice and this permission notice appear in all copies.
9			*
10			* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11			* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12			* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13			* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14			* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15			* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16			* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17			*/
18			#include <sys/types.h>
19			#include <sys/queue.h>
20			#include <sys/stat.h>
21			#include <sys/socket.h>
22			#include <sys/uio.h>
23			#include <sys/un.h>
24
25			#include <net/if.h>
26			#include <netinet/in.h>
27			#include <netinet/if_ether.h>
28
29			#include <errno.h>
30			#include <event.h>
31			#include <imsg.h>
32			#include <md5.h>
33			#include <stdlib.h>
34			#include <string.h>
35			#include <unistd.h>
36
37			#include "log.h"
38			#include "slaacd.h"
39			#include "control.h"
40			#include "frontend.h"
41
42			#define CONTROL_BACKLOG 5
43
44			struct ctl_conn *control_connbyfd(int);
45			struct ctl_conn *control_connbypid(pid_t);
46			void control_close(int);
47
48			int
49			control_init(char *path)
50			{
51			struct sockaddr_un sun;
52			int fd;
53			mode_t old_umask;
54
55			if ((fd = socket(AF_UNIX, SOCK_STREAM \| SOCK_CLOEXEC \| SOCK_NONBLOCK,
56			0)) == -1) {
57			log_warn("%s: socket", __func__);
58			return (-1);
59			}
60
61			memset(&sun, 0, sizeof(sun));
62			sun.sun_family = AF_UNIX;
63			strlcpy(sun.sun_path, path, sizeof(sun.sun_path));
64
65			if (unlink(path) == -1)
66			if (errno != ENOENT) {
67			log_warn("%s: unlink %s", __func__, path);
68			close(fd);
69			return (-1);
70			}
71
72			old_umask = umask(S_IXUSR\|S_IXGRP\|S_IWOTH\|S_IROTH\|S_IXOTH);
73			if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
74			log_warn("%s: bind: %s", __func__, path);
75			close(fd);
76			umask(old_umask);
77			return (-1);
78			}
79			umask(old_umask);
80
81			if (chmod(path, S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP) == -1) {
82			log_warn("%s: chmod", __func__);
83			close(fd);
84			(void)unlink(path);
85			return (-1);
86			}
87
88			control_state.fd = fd;
89
90			return (0);
91			}
92
93			int
94			control_listen(void)
95			{
96
97			if (listen(control_state.fd, CONTROL_BACKLOG) == -1) {
98			log_warn("%s: listen", __func__);
99			return (-1);
100			}
101
102			event_set(&control_state.ev, control_state.fd, EV_READ,
103			control_accept, NULL);
104			event_add(&control_state.ev, NULL);
105			evtimer_set(&control_state.evt, control_accept, NULL);
106
107			return (0);
108			}
109
110			void
111			control_cleanup(char *path)
112			{
113	✓✗	24	if (path == NULL)
114			return;
115		12	event_del(&control_state.ev);
116		12	event_del(&control_state.evt);
117		12	unlink(path);
118		24	}
119
120			void
121			control_accept(int listenfd, short event, void *bula)
122			{
123			int connfd;
124			socklen_t len;
125			struct sockaddr_un sun;
126			struct ctl_conn *c;
127
128			event_add(&control_state.ev, NULL);
129			if ((event & EV_TIMEOUT))
130			return;
131
132			len = sizeof(sun);
133			if ((connfd = accept4(listenfd, (struct sockaddr *)&sun, &len,
134			SOCK_CLOEXEC \| SOCK_NONBLOCK)) == -1) {
135			/*
136			* Pause accept if we are out of file descriptors, or
137			* libevent will haunt us here too.
138			*/
139			if (errno == ENFILE \|\| errno == EMFILE) {
140			struct timeval evtpause = { 1, 0 };
141
142			event_del(&control_state.ev);
143			evtimer_add(&control_state.evt, &evtpause);
144			} else if (errno != EWOULDBLOCK && errno != EINTR &&
145			errno != ECONNABORTED)
146			log_warn("%s: accept4", __func__);
147			return;
148			}
149
150			if ((c = calloc(1, sizeof(struct ctl_conn))) == NULL) {
151			log_warn("%s: calloc", __func__);
152			close(connfd);
153			return;
154			}
155
156			imsg_init(&c->iev.ibuf, connfd);
157			c->iev.handler = control_dispatch_imsg;
158			c->iev.events = EV_READ;
159			event_set(&c->iev.ev, c->iev.ibuf.fd, c->iev.events,
160			c->iev.handler, &c->iev);
161			event_add(&c->iev.ev, NULL);
162
163			TAILQ_INSERT_TAIL(&ctl_conns, c, entry);
164			}
165
166			struct ctl_conn *
167			control_connbyfd(int fd)
168			{
169			struct ctl_conn *c;
170
171			TAILQ_FOREACH(c, &ctl_conns, entry) {
172			if (c->iev.ibuf.fd == fd)
173			break;
174			}
175
176			return (c);
177			}
178
179			struct ctl_conn *
180			control_connbypid(pid_t pid)
181			{
182			struct ctl_conn *c;
183
184			TAILQ_FOREACH(c, &ctl_conns, entry) {
185			if (c->iev.ibuf.pid == pid)
186			break;
187			}
188
189			return (c);
190			}
191
192			void
193			control_close(int fd)
194			{
195			struct ctl_conn *c;
196
197			if ((c = control_connbyfd(fd)) == NULL) {
198			log_warnx("%s: fd %d: not found", __func__, fd);
199			return;
200			}
201
202			msgbuf_clear(&c->iev.ibuf.w);
203			TAILQ_REMOVE(&ctl_conns, c, entry);
204
205			event_del(&c->iev.ev);
206			close(c->iev.ibuf.fd);
207
208			/* Some file descriptors are available again. */
209			if (evtimer_pending(&control_state.evt, NULL)) {
210			evtimer_del(&control_state.evt);
211			event_add(&control_state.ev, NULL);
212			}
213
214			free(c);
215			}
216
217			void
218			control_dispatch_imsg(int fd, short event, void *bula)
219			{
220			struct ctl_conn *c;
221			struct imsg imsg;
222			ssize_t n;
223			int verbose;
224
225			if ((c = control_connbyfd(fd)) == NULL) {
226			log_warnx("%s: fd %d: not found", __func__, fd);
227			return;
228			}
229
230			if (event & EV_READ) {
231			if (((n = imsg_read(&c->iev.ibuf)) == -1 && errno != EAGAIN) \|\|
232			n == 0) {
233			control_close(fd);
234			return;
235			}
236			}
237			if (event & EV_WRITE) {
238			if (msgbuf_write(&c->iev.ibuf.w) <= 0 && errno != EAGAIN) {
239			control_close(fd);
240			return;
241			}
242			}
243
244			for (;;) {
245			if ((n = imsg_get(&c->iev.ibuf, &imsg)) == -1) {
246			control_close(fd);
247			return;
248			}
249			if (n == 0)
250			break;
251
252			switch (imsg.hdr.type) {
253			case IMSG_CTL_LOG_VERBOSE:
254			if (imsg.hdr.len != IMSG_HEADER_SIZE +
255			sizeof(verbose))
256			break;
257
258			/* Forward to all other processes. */
259			frontend_imsg_compose_main(imsg.hdr.type, imsg.hdr.pid,
260			imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE);
261			frontend_imsg_compose_engine(imsg.hdr.type, 0,
262			imsg.hdr.pid, imsg.data,
263			imsg.hdr.len - IMSG_HEADER_SIZE);
264
265			memcpy(&verbose, imsg.data, sizeof(verbose));
266			log_setverbose(verbose);
267			break;
268			case IMSG_CTL_SHOW_INTERFACE_INFO:
269			c->iev.ibuf.pid = imsg.hdr.pid;
270			frontend_imsg_compose_engine(imsg.hdr.type, 0,
271			imsg.hdr.pid, imsg.data, imsg.hdr.len -
272			IMSG_HEADER_SIZE);
273			break;
274			case IMSG_CTL_SEND_SOLICITATION:
275			c->iev.ibuf.pid = imsg.hdr.pid;
276			frontend_imsg_compose_engine(imsg.hdr.type, 0,
277			imsg.hdr.pid, imsg.data, imsg.hdr.len -
278			IMSG_HEADER_SIZE);
279			break;
280			default:
281			log_debug("%s: error handling imsg %d", __func__,
282			imsg.hdr.type);
283			break;
284			}
285			imsg_free(&imsg);
286			}
287
288			imsg_event_add(&c->iev);
289			}
290
291			int
292			control_imsg_relay(struct imsg *imsg)
293			{
294			struct ctl_conn *c;
295
296			if ((c = control_connbypid(imsg->hdr.pid)) == NULL)
297			return (0);
298
299			return (imsg_compose_event(&c->iev, imsg->hdr.type, 0, imsg->hdr.pid,
300			-1, imsg->data, imsg->hdr.len - IMSG_HEADER_SIZE));
301			}