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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	sbin/iked/control.c	Lines:	0	140	0.0 %
Date:	2017-11-07	Branches:	0	87	0.0 %


/*	$OpenBSD: control.c,v 1.25 2017/01/17 22:10:55 krw Exp $	*/

/*
 * Copyright (c) 2010-2013 Reyk Floeter <reyk@openbsd.org>
 * 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/queue.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/tree.h>

#include <net/if.h>

#include <errno.h>
#include <event.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>

#include "iked.h"

#define	CONTROL_BACKLOG	5

struct ctl_connlist ctl_conns;

void
	 control_accept(int, short, void *);
struct ctl_conn
	*control_connbyfd(int);
void	 control_close(int, struct control_sock *);
void	 control_dispatch_imsg(int, short, void *);
void	 control_dispatch_parent(int, short, void *);
void	 control_imsg_forward(struct imsg *);
void	 control_run(struct privsep *, struct privsep_proc *, void *);

static struct privsep_proc procs[] = {
	{ "parent",	PROC_PARENT, NULL }
};

pid_t
control(struct privsep *ps, struct privsep_proc *p)
{
	return (proc_run(ps, p, procs, nitems(procs), control_run, NULL));
}

void
control_run(struct privsep *ps, struct privsep_proc *p, void *arg)
{
	/*
	 * pledge in the control process:
	 * stdio - for malloc and basic I/O including events.
	 * cpath - for unlinking the control socket.
	 * unix - for the control socket.
	 */
	if (pledge("stdio cpath unix flock rpath wpath", NULL) == -1)
		fatal("pledge");
}

int
control_init(struct privsep *ps, struct control_sock *cs)
{
	struct iked		*env = ps->ps_env;
	struct sockaddr_un	 sun;
	int			 fd;
	mode_t			 old_umask, mode;

	if (cs->cs_name == NULL)
		return (0);

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

	sun.sun_family = AF_UNIX;
	if (strlcpy(sun.sun_path, cs->cs_name,
	    sizeof(sun.sun_path)) >= sizeof(sun.sun_path)) {
		log_warn("%s: %s name too long", __func__, cs->cs_name);
		close(fd);
		return (-1);
	}

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

	if (cs->cs_restricted) {
		old_umask = umask(S_IXUSR|S_IXGRP|S_IXOTH);
		mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH;
	} else {
		old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
		mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP;
	}

	if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
		log_warn("%s: bind: %s", __func__, cs->cs_name);
		close(fd);
		(void)umask(old_umask);
		return (-1);
	}
	(void)umask(old_umask);

	if (chmod(cs->cs_name, mode) == -1) {
		log_warn("%s: chmod", __func__);
		close(fd);
		(void)unlink(cs->cs_name);
		return (-1);
	}

	cs->cs_fd = fd;
	cs->cs_env = env;

	return (0);
}

int
control_listen(struct control_sock *cs)
{
	if (cs->cs_name == NULL)
		return (0);

	if (listen(cs->cs_fd, CONTROL_BACKLOG) == -1) {
		log_warn("%s: listen", __func__);
		return (-1);
	}

	event_set(&cs->cs_ev, cs->cs_fd, EV_READ,
	    control_accept, cs);
	event_add(&cs->cs_ev, NULL);
	evtimer_set(&cs->cs_evt, control_accept, cs);

	return (0);
}

void
control_cleanup(struct control_sock *cs)
{
	if (cs->cs_name == NULL)
		return;
	event_del(&cs->cs_ev);
	event_del(&cs->cs_evt);
	(void)unlink(cs->cs_name);
}

/* ARGSUSED */
void
control_accept(int listenfd, short event, void *arg)
{
	struct control_sock	*cs = arg;
	int			 connfd;
	socklen_t		 len;
	struct sockaddr_un	 sun;
	struct ctl_conn		*c;

	event_add(&cs->cs_ev, NULL);
	if ((event & EV_TIMEOUT))
		return;

	len = sizeof(sun);
	if ((connfd = accept4(listenfd,
	    (struct sockaddr *)&sun, &len, 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(&cs->cs_ev);
			evtimer_add(&cs->cs_evt, &evtpause);
		} else if (errno != EWOULDBLOCK && errno != EINTR &&
		    errno != ECONNABORTED)
			log_warn("%s: accept", __func__);
		return;
	}

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

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

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

	if ((c = control_connbyfd(fd)) == NULL) {
		log_warn("%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(&cs->cs_evt, NULL)) {
		evtimer_del(&cs->cs_evt);
		event_add(&cs->cs_ev, NULL);
	}

	free(c);
}

/* ARGSUSED */
void
control_dispatch_imsg(int fd, short event, void *arg)
{
	struct control_sock	*cs = arg;
	struct iked		*env = cs->cs_env;
	struct ctl_conn		*c;
	struct imsg		 imsg;
	int			 n, v;

	if ((c = control_connbyfd(fd)) == NULL) {
		log_warn("%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, cs);
			return;
		}
	}
	if (event & EV_WRITE) {
		if (msgbuf_write(&c->iev.ibuf.w) <= 0 && errno != EAGAIN) {
			control_close(fd, cs);
			return;
		}
	}

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

		if (n == 0)
			break;

		control_imsg_forward(&imsg);

		switch (imsg.hdr.type) {
		case IMSG_CTL_NOTIFY:
			if (c->flags & CTL_CONN_NOTIFY) {
				log_debug("%s: "
				    "client requested notify more than once",
				    __func__);
				imsg_compose_event(&c->iev, IMSG_CTL_FAIL,
				    0, 0, -1, NULL, 0);
				break;
			}
			c->flags |= CTL_CONN_NOTIFY;
			break;
		case IMSG_CTL_VERBOSE:
			IMSG_SIZE_CHECK(&imsg, &v);

			memcpy(&v, imsg.data, sizeof(v));
			log_setverbose(v);

			proc_forward_imsg(&env->sc_ps, &imsg, PROC_PARENT, -1);
			break;
		case IMSG_CTL_RELOAD:
		case IMSG_CTL_RESET:
		case IMSG_CTL_COUPLE:
		case IMSG_CTL_DECOUPLE:
		case IMSG_CTL_ACTIVE:
		case IMSG_CTL_PASSIVE:
			proc_forward_imsg(&env->sc_ps, &imsg, PROC_PARENT, -1);
			break;
		default:
			log_debug("%s: error handling imsg %d",
			    __func__, imsg.hdr.type);
			break;
		}
		imsg_free(&imsg);
	}

	imsg_event_add(&c->iev);
}

void
control_imsg_forward(struct imsg *imsg)
{
	struct ctl_conn *c;

	TAILQ_FOREACH(c, &ctl_conns, entry)
		if (c->flags & CTL_CONN_NOTIFY)
			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 1.25 2017/01/17 22:10:55 krw Exp $ */
2
3			/*
4			* Copyright (c) 2010-2013 Reyk Floeter <reyk@openbsd.org>
5			* Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
6			*
7			* Permission to use, copy, modify, and distribute this software for any
8			* purpose with or without fee is hereby granted, provided that the above
9			* copyright notice and this permission notice appear in all copies.
10			*
11			* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12			* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13			* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14			* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15			* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16			* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17			* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18			*/
19
20			#include <sys/queue.h>
21			#include <sys/stat.h>
22			#include <sys/socket.h>
23			#include <sys/un.h>
24			#include <sys/tree.h>
25
26			#include <net/if.h>
27
28			#include <errno.h>
29			#include <event.h>
30			#include <fcntl.h>
31			#include <stdlib.h>
32			#include <string.h>
33			#include <unistd.h>
34			#include <signal.h>
35
36			#include "iked.h"
37
38			#define CONTROL_BACKLOG 5
39
40			struct ctl_connlist ctl_conns;
41
42			void
43			control_accept(int, short, void *);
44			struct ctl_conn
45			*control_connbyfd(int);
46			void control_close(int, struct control_sock *);
47			void control_dispatch_imsg(int, short, void *);
48			void control_dispatch_parent(int, short, void *);
49			void control_imsg_forward(struct imsg *);
50			void control_run(struct privsep , struct privsep_proc , void *);
51
52			static struct privsep_proc procs[] = {
53			{ "parent", PROC_PARENT, NULL }
54			};
55
56			pid_t
57			control(struct privsep ps, struct privsep_proc p)
58			{
59			return (proc_run(ps, p, procs, nitems(procs), control_run, NULL));
60			}
61
62			void
63			control_run(struct privsep ps, struct privsep_proc p, void *arg)
64			{
65			/*
66			* pledge in the control process:
67			* stdio - for malloc and basic I/O including events.
68			* cpath - for unlinking the control socket.
69			* unix - for the control socket.
70			*/
71			if (pledge("stdio cpath unix flock rpath wpath", NULL) == -1)
72			fatal("pledge");
73			}
74
75			int
76			control_init(struct privsep ps, struct control_sock cs)
77			{
78			struct iked *env = ps->ps_env;
79			struct sockaddr_un sun;
80			int fd;
81			mode_t old_umask, mode;
82
83			if (cs->cs_name == NULL)
84			return (0);
85
86			if ((fd = socket(AF_UNIX, SOCK_STREAM \| SOCK_NONBLOCK, 0)) == -1) {
87			log_warn("%s: socket", __func__);
88			return (-1);
89			}
90
91			sun.sun_family = AF_UNIX;
92			if (strlcpy(sun.sun_path, cs->cs_name,
93			sizeof(sun.sun_path)) >= sizeof(sun.sun_path)) {
94			log_warn("%s: %s name too long", __func__, cs->cs_name);
95			close(fd);
96			return (-1);
97			}
98
99			if (unlink(cs->cs_name) == -1)
100			if (errno != ENOENT) {
101			log_warn("%s: unlink %s", __func__, cs->cs_name);
102			close(fd);
103			return (-1);
104			}
105
106			if (cs->cs_restricted) {
107			old_umask = umask(S_IXUSR\|S_IXGRP\|S_IXOTH);
108			mode = S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP\|S_IROTH\|S_IWOTH;
109			} else {
110			old_umask = umask(S_IXUSR\|S_IXGRP\|S_IWOTH\|S_IROTH\|S_IXOTH);
111			mode = S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP;
112			}
113
114			if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
115			log_warn("%s: bind: %s", __func__, cs->cs_name);
116			close(fd);
117			(void)umask(old_umask);
118			return (-1);
119			}
120			(void)umask(old_umask);
121
122			if (chmod(cs->cs_name, mode) == -1) {
123			log_warn("%s: chmod", __func__);
124			close(fd);
125			(void)unlink(cs->cs_name);
126			return (-1);
127			}
128
129			cs->cs_fd = fd;
130			cs->cs_env = env;
131
132			return (0);
133			}
134
135			int
136			control_listen(struct control_sock *cs)
137			{
138			if (cs->cs_name == NULL)
139			return (0);
140
141			if (listen(cs->cs_fd, CONTROL_BACKLOG) == -1) {
142			log_warn("%s: listen", __func__);
143			return (-1);
144			}
145
146			event_set(&cs->cs_ev, cs->cs_fd, EV_READ,
147			control_accept, cs);
148			event_add(&cs->cs_ev, NULL);
149			evtimer_set(&cs->cs_evt, control_accept, cs);
150
151			return (0);
152			}
153
154			void
155			control_cleanup(struct control_sock *cs)
156			{
157			if (cs->cs_name == NULL)
158			return;
159			event_del(&cs->cs_ev);
160			event_del(&cs->cs_evt);
161			(void)unlink(cs->cs_name);
162			}
163
164			/* ARGSUSED */
165			void
166			control_accept(int listenfd, short event, void *arg)
167			{
168			struct control_sock *cs = arg;
169			int connfd;
170			socklen_t len;
171			struct sockaddr_un sun;
172			struct ctl_conn *c;
173
174			event_add(&cs->cs_ev, NULL);
175			if ((event & EV_TIMEOUT))
176			return;
177
178			len = sizeof(sun);
179			if ((connfd = accept4(listenfd,
180			(struct sockaddr *)&sun, &len, SOCK_NONBLOCK)) == -1) {
181			/*
182			* Pause accept if we are out of file descriptors, or
183			* libevent will haunt us here too.
184			*/
185			if (errno == ENFILE \|\| errno == EMFILE) {
186			struct timeval evtpause = { 1, 0 };
187
188			event_del(&cs->cs_ev);
189			evtimer_add(&cs->cs_evt, &evtpause);
190			} else if (errno != EWOULDBLOCK && errno != EINTR &&
191			errno != ECONNABORTED)
192			log_warn("%s: accept", __func__);
193			return;
194			}
195
196			if ((c = calloc(1, sizeof(struct ctl_conn))) == NULL) {
197			log_warn("%s", __func__);
198			close(connfd);
199			return;
200			}
201
202			imsg_init(&c->iev.ibuf, connfd);
203			c->iev.handler = control_dispatch_imsg;
204			c->iev.events = EV_READ;
205			c->iev.data = cs;
206			event_set(&c->iev.ev, c->iev.ibuf.fd, c->iev.events,
207			c->iev.handler, c->iev.data);
208			event_add(&c->iev.ev, NULL);
209
210			TAILQ_INSERT_TAIL(&ctl_conns, c, entry);
211			}
212
213			struct ctl_conn *
214			control_connbyfd(int fd)
215			{
216			struct ctl_conn *c;
217
218			TAILQ_FOREACH(c, &ctl_conns, entry) {
219			if (c->iev.ibuf.fd == fd)
220			break;
221			}
222
223			return (c);
224			}
225
226			void
227			control_close(int fd, struct control_sock *cs)
228			{
229			struct ctl_conn *c;
230
231			if ((c = control_connbyfd(fd)) == NULL) {
232			log_warn("%s: fd %d: not found", __func__, fd);
233			return;
234			}
235
236			msgbuf_clear(&c->iev.ibuf.w);
237			TAILQ_REMOVE(&ctl_conns, c, entry);
238
239			event_del(&c->iev.ev);
240			close(c->iev.ibuf.fd);
241
242			/* Some file descriptors are available again. */
243			if (evtimer_pending(&cs->cs_evt, NULL)) {
244			evtimer_del(&cs->cs_evt);
245			event_add(&cs->cs_ev, NULL);
246			}
247
248			free(c);
249			}
250
251			/* ARGSUSED */
252			void
253			control_dispatch_imsg(int fd, short event, void *arg)
254			{
255			struct control_sock *cs = arg;
256			struct iked *env = cs->cs_env;
257			struct ctl_conn *c;
258			struct imsg imsg;
259			int n, v;
260
261			if ((c = control_connbyfd(fd)) == NULL) {
262			log_warn("%s: fd %d: not found", __func__, fd);
263			return;
264			}
265
266			if (event & EV_READ) {
267			if (((n = imsg_read(&c->iev.ibuf)) == -1 && errno != EAGAIN) \|\|
268			n == 0) {
269			control_close(fd, cs);
270			return;
271			}
272			}
273			if (event & EV_WRITE) {
274			if (msgbuf_write(&c->iev.ibuf.w) <= 0 && errno != EAGAIN) {
275			control_close(fd, cs);
276			return;
277			}
278			}
279
280			for (;;) {
281			if ((n = imsg_get(&c->iev.ibuf, &imsg)) == -1) {
282			control_close(fd, cs);
283			return;
284			}
285
286			if (n == 0)
287			break;
288
289			control_imsg_forward(&imsg);
290
291			switch (imsg.hdr.type) {
292			case IMSG_CTL_NOTIFY:
293			if (c->flags & CTL_CONN_NOTIFY) {
294			log_debug("%s: "
295			"client requested notify more than once",
296			__func__);
297			imsg_compose_event(&c->iev, IMSG_CTL_FAIL,
298			0, 0, -1, NULL, 0);
299			break;
300			}
301			c->flags \|= CTL_CONN_NOTIFY;
302			break;
303			case IMSG_CTL_VERBOSE:
304			IMSG_SIZE_CHECK(&imsg, &v);
305
306			memcpy(&v, imsg.data, sizeof(v));
307			log_setverbose(v);
308
309			proc_forward_imsg(&env->sc_ps, &imsg, PROC_PARENT, -1);
310			break;
311			case IMSG_CTL_RELOAD:
312			case IMSG_CTL_RESET:
313			case IMSG_CTL_COUPLE:
314			case IMSG_CTL_DECOUPLE:
315			case IMSG_CTL_ACTIVE:
316			case IMSG_CTL_PASSIVE:
317			proc_forward_imsg(&env->sc_ps, &imsg, PROC_PARENT, -1);
318			break;
319			default:
320			log_debug("%s: error handling imsg %d",
321			__func__, imsg.hdr.type);
322			break;
323			}
324			imsg_free(&imsg);
325			}
326
327			imsg_event_add(&c->iev);
328			}
329
330			void
331			control_imsg_forward(struct imsg *imsg)
332			{
333			struct ctl_conn *c;
334
335			TAILQ_FOREACH(c, &ctl_conns, entry)
336			if (c->flags & CTL_CONN_NOTIFY)
337			imsg_compose_event(&c->iev, imsg->hdr.type,
338			0, imsg->hdr.pid, -1, imsg->data,
339			imsg->hdr.len - IMSG_HEADER_SIZE);
340			}