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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.sbin/vmd/control.c	Lines:	0	196	0.0 %
Date:	2017-11-13	Branches:	0	130	0.0 %


/*	$OpenBSD: control.c,v 1.22 2017/09/08 06:24:31 mlarkin Exp $	*/

/*
 * Copyright (c) 2010-2015 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/param.h>	/* nitems */
#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 "proc.h"
#include "vmd.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 *);
int	 control_dispatch_vmd(int, struct privsep_proc *, struct imsg *);
void	 control_imsg_forward(struct imsg *);
void	 control_run(struct privsep *, struct privsep_proc *, void *);

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

void
control(struct privsep *ps, struct privsep_proc *p)
{
	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 managing the control socket.
	 * unix - for the control socket.
	 * recvfd - for the proc fd exchange.
	 * sendfd - for send and receive.
	 */
	if (pledge("stdio cpath unix recvfd sendfd flock rpath wpath", NULL) == -1)
		fatal("pledge");
}

int
control_dispatch_vmd(int fd, struct privsep_proc *p, struct imsg *imsg)
{
	struct ctl_conn		*c;
	struct privsep		*ps = p->p_ps;

	switch (imsg->hdr.type) {
	case IMSG_VMDOP_START_VM_RESPONSE:
	case IMSG_VMDOP_PAUSE_VM_RESPONSE:
	case IMSG_VMDOP_SEND_VM_RESPONSE:
	case IMSG_VMDOP_RECEIVE_VM_RESPONSE:
	case IMSG_VMDOP_UNPAUSE_VM_RESPONSE:
	case IMSG_VMDOP_TERMINATE_VM_RESPONSE:
	case IMSG_VMDOP_GET_INFO_VM_DATA:
	case IMSG_VMDOP_GET_INFO_VM_END_DATA:
	case IMSG_CTL_FAIL:
	case IMSG_CTL_OK:
		if ((c = control_connbyfd(imsg->hdr.peerid)) == NULL) {
			log_warnx("%s: lost control connection: fd %d",
			    __func__, imsg->hdr.peerid);
			return (0);
		}
		imsg_compose_event(&c->iev, imsg->hdr.type,
		    0, 0, imsg->fd, imsg->data, IMSG_DATA_SIZE(imsg));
		break;
	case IMSG_VMDOP_CONFIG:
		config_getconfig(ps->ps_env, imsg);
		break;
	case IMSG_CTL_RESET:
		config_getreset(ps->ps_env, imsg);
		break;
	default:
		return (-1);
	}

	return (0);
}

int
control_init(struct privsep *ps, struct control_sock *cs)
{
	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 = ps;

	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);
}

/* 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;
	}

	if (getsockopt(connfd, SOL_SOCKET, SO_PEERCRED,
	    &c->peercred, &len) != 0) {
		log_warn("%s: failed to get peer credentials", __func__);
		close(connfd);
		free(c);
		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 privsep			*ps = cs->cs_env;
	struct ctl_conn			*c;
	struct imsg			 imsg;
	struct vmop_create_params	 vmc;
	struct vmop_id			 vid;
	int				 n, v, ret = 0;

	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;

		switch (imsg.hdr.type) {
		case IMSG_VMDOP_GET_INFO_VM_REQUEST:
		case IMSG_VMDOP_TERMINATE_VM_REQUEST:
		case IMSG_VMDOP_START_VM_REQUEST:
			break;
		default:
			if (c->peercred.uid != 0) {
				log_warnx("denied request %d from uid %d",
				    imsg.hdr.type, c->peercred.uid);
				ret = EPERM;
				goto fail;
			}
			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__);
				ret = EINVAL;
				goto fail;
			}
			c->flags |= CTL_CONN_NOTIFY;
			break;
		case IMSG_CTL_VERBOSE:
			if (IMSG_DATA_SIZE(&imsg) < sizeof(v))
				goto fail;
			memcpy(&v, imsg.data, sizeof(v));
			log_setverbose(v);

			/* FALLTHROUGH */
		case IMSG_VMDOP_RECEIVE_VM_REQUEST:
		case IMSG_VMDOP_SEND_VM_REQUEST:
		case IMSG_VMDOP_PAUSE_VM:
		case IMSG_VMDOP_UNPAUSE_VM:
		case IMSG_VMDOP_LOAD:
		case IMSG_VMDOP_RELOAD:
		case IMSG_CTL_RESET:
			if (proc_compose_imsg(ps, PROC_PARENT, -1,
			    imsg.hdr.type, fd, imsg.fd,
			    imsg.data, IMSG_DATA_SIZE(&imsg)) == -1)
				goto fail;
			break;
		case IMSG_VMDOP_START_VM_REQUEST:
			if (IMSG_DATA_SIZE(&imsg) < sizeof(vmc))
				goto fail;
			memcpy(&vmc, imsg.data, sizeof(vmc));
			vmc.vmc_uid = c->peercred.uid;
			vmc.vmc_gid = -1;

			if (proc_compose_imsg(ps, PROC_PARENT, -1,
			    imsg.hdr.type, fd, -1, &vmc, sizeof(vmc)) == -1) {
				control_close(fd, cs);
				return;
			}
			break;
		case IMSG_VMDOP_TERMINATE_VM_REQUEST:
			if (IMSG_DATA_SIZE(&imsg) < sizeof(vid))
				goto fail;
			memcpy(&vid, imsg.data, sizeof(vid));
			vid.vid_uid = c->peercred.uid;
			log_debug("%s id: %d, name: %s, uid: %d",
			    __func__, vid.vid_id, vid.vid_name,
			    vid.vid_uid);

			if (proc_compose_imsg(ps, PROC_PARENT, -1,
			    imsg.hdr.type, fd, -1, &vid, sizeof(vid)) == -1) {
				log_debug("%s: proc_compose_imsg failed",
				    __func__);
				control_close(fd, cs);
				return;
			}
			break;
		case IMSG_VMDOP_GET_INFO_VM_REQUEST:
			if (IMSG_DATA_SIZE(&imsg) != 0)
				goto fail;
			if (proc_compose_imsg(ps, PROC_PARENT, -1,
			    imsg.hdr.type, fd, -1, NULL, 0) == -1) {
				control_close(fd, cs);
				return;
			}
			break;
		default:
			log_debug("%s: error handling imsg %d",
			    __func__, imsg.hdr.type);
			control_close(fd, cs);
			break;
		}
		imsg_free(&imsg);
	}

	imsg_event_add(&c->iev);
	return;

 fail:
	if (ret == 0)
		ret = EINVAL;
	imsg_compose_event(&c->iev, IMSG_CTL_FAIL,
	    0, 0, -1, &ret, sizeof(ret));
	imsg_flush(&c->iev.ibuf);
	control_close(fd, cs);
}

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,
			    imsg->hdr.peerid, 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 1.22 2017/09/08 06:24:31 mlarkin Exp $ */
2
3			/*
4			* Copyright (c) 2010-2015 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/param.h> /* nitems */
21			#include <sys/queue.h>
22			#include <sys/stat.h>
23			#include <sys/socket.h>
24			#include <sys/un.h>
25			#include <sys/tree.h>
26
27			#include <net/if.h>
28
29			#include <errno.h>
30			#include <event.h>
31			#include <fcntl.h>
32			#include <stdlib.h>
33			#include <string.h>
34			#include <unistd.h>
35			#include <signal.h>
36
37			#include "proc.h"
38			#include "vmd.h"
39
40			#define CONTROL_BACKLOG 5
41
42			struct ctl_connlist ctl_conns;
43
44			void
45			control_accept(int, short, void *);
46			struct ctl_conn
47			*control_connbyfd(int);
48			void control_close(int, struct control_sock *);
49			void control_dispatch_imsg(int, short, void *);
50			int control_dispatch_vmd(int, struct privsep_proc , struct imsg );
51			void control_imsg_forward(struct imsg *);
52			void control_run(struct privsep , struct privsep_proc , void *);
53
54			static struct privsep_proc procs[] = {
55			{ "parent", PROC_PARENT, control_dispatch_vmd }
56			};
57
58			void
59			control(struct privsep ps, struct privsep_proc p)
60			{
61			proc_run(ps, p, procs, nitems(procs), control_run, NULL);
62			}
63
64			void
65			control_run(struct privsep ps, struct privsep_proc p, void *arg)
66			{
67			/*
68			* pledge in the control process:
69			* stdio - for malloc and basic I/O including events.
70			* cpath - for managing the control socket.
71			* unix - for the control socket.
72			* recvfd - for the proc fd exchange.
73			* sendfd - for send and receive.
74			*/
75			if (pledge("stdio cpath unix recvfd sendfd flock rpath wpath", NULL) == -1)
76			fatal("pledge");
77			}
78
79			int
80			control_dispatch_vmd(int fd, struct privsep_proc p, struct imsg imsg)
81			{
82			struct ctl_conn *c;
83			struct privsep *ps = p->p_ps;
84
85			switch (imsg->hdr.type) {
86			case IMSG_VMDOP_START_VM_RESPONSE:
87			case IMSG_VMDOP_PAUSE_VM_RESPONSE:
88			case IMSG_VMDOP_SEND_VM_RESPONSE:
89			case IMSG_VMDOP_RECEIVE_VM_RESPONSE:
90			case IMSG_VMDOP_UNPAUSE_VM_RESPONSE:
91			case IMSG_VMDOP_TERMINATE_VM_RESPONSE:
92			case IMSG_VMDOP_GET_INFO_VM_DATA:
93			case IMSG_VMDOP_GET_INFO_VM_END_DATA:
94			case IMSG_CTL_FAIL:
95			case IMSG_CTL_OK:
96			if ((c = control_connbyfd(imsg->hdr.peerid)) == NULL) {
97			log_warnx("%s: lost control connection: fd %d",
98			__func__, imsg->hdr.peerid);
99			return (0);
100			}
101			imsg_compose_event(&c->iev, imsg->hdr.type,
102			0, 0, imsg->fd, imsg->data, IMSG_DATA_SIZE(imsg));
103			break;
104			case IMSG_VMDOP_CONFIG:
105			config_getconfig(ps->ps_env, imsg);
106			break;
107			case IMSG_CTL_RESET:
108			config_getreset(ps->ps_env, imsg);
109			break;
110			default:
111			return (-1);
112			}
113
114			return (0);
115			}
116
117			int
118			control_init(struct privsep ps, struct control_sock cs)
119			{
120			struct sockaddr_un sun;
121			int fd;
122			mode_t old_umask, mode;
123
124			if (cs->cs_name == NULL)
125			return (0);
126
127			if ((fd = socket(AF_UNIX, SOCK_STREAM \| SOCK_NONBLOCK, 0)) == -1) {
128			log_warn("%s: socket", __func__);
129			return (-1);
130			}
131
132			sun.sun_family = AF_UNIX;
133			if (strlcpy(sun.sun_path, cs->cs_name,
134			sizeof(sun.sun_path)) >= sizeof(sun.sun_path)) {
135			log_warn("%s: %s name too long", __func__, cs->cs_name);
136			close(fd);
137			return (-1);
138			}
139
140			if (unlink(cs->cs_name) == -1)
141			if (errno != ENOENT) {
142			log_warn("%s: unlink %s", __func__, cs->cs_name);
143			close(fd);
144			return (-1);
145			}
146
147			if (cs->cs_restricted) {
148			old_umask = umask(S_IXUSR\|S_IXGRP\|S_IXOTH);
149			mode = S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP\|S_IROTH\|S_IWOTH;
150			} else {
151			old_umask = umask(S_IXUSR\|S_IXGRP\|S_IWOTH\|S_IROTH\|S_IXOTH);
152			mode = S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP;
153			}
154
155			if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
156			log_warn("%s: bind: %s", __func__, cs->cs_name);
157			close(fd);
158			(void)umask(old_umask);
159			return (-1);
160			}
161			(void)umask(old_umask);
162
163			if (chmod(cs->cs_name, mode) == -1) {
164			log_warn("%s: chmod", __func__);
165			close(fd);
166			(void)unlink(cs->cs_name);
167			return (-1);
168			}
169
170			cs->cs_fd = fd;
171			cs->cs_env = ps;
172
173			return (0);
174			}
175
176			int
177			control_listen(struct control_sock *cs)
178			{
179			if (cs->cs_name == NULL)
180			return (0);
181
182			if (listen(cs->cs_fd, CONTROL_BACKLOG) == -1) {
183			log_warn("%s: listen", __func__);
184			return (-1);
185			}
186
187			event_set(&cs->cs_ev, cs->cs_fd, EV_READ,
188			control_accept, cs);
189			event_add(&cs->cs_ev, NULL);
190			evtimer_set(&cs->cs_evt, control_accept, cs);
191
192			return (0);
193			}
194
195			void
196			control_cleanup(struct control_sock *cs)
197			{
198			if (cs->cs_name == NULL)
199			return;
200			event_del(&cs->cs_ev);
201			event_del(&cs->cs_evt);
202			}
203
204			/* ARGSUSED */
205			void
206			control_accept(int listenfd, short event, void *arg)
207			{
208			struct control_sock *cs = arg;
209			int connfd;
210			socklen_t len;
211			struct sockaddr_un sun;
212			struct ctl_conn *c;
213
214			event_add(&cs->cs_ev, NULL);
215			if ((event & EV_TIMEOUT))
216			return;
217
218			len = sizeof(sun);
219			if ((connfd = accept4(listenfd,
220			(struct sockaddr *)&sun, &len, SOCK_NONBLOCK)) == -1) {
221			/*
222			* Pause accept if we are out of file descriptors, or
223			* libevent will haunt us here too.
224			*/
225			if (errno == ENFILE \|\| errno == EMFILE) {
226			struct timeval evtpause = { 1, 0 };
227
228			event_del(&cs->cs_ev);
229			evtimer_add(&cs->cs_evt, &evtpause);
230			} else if (errno != EWOULDBLOCK && errno != EINTR &&
231			errno != ECONNABORTED)
232			log_warn("%s: accept", __func__);
233			return;
234			}
235
236			if ((c = calloc(1, sizeof(struct ctl_conn))) == NULL) {
237			log_warn("%s", __func__);
238			close(connfd);
239			return;
240			}
241
242			if (getsockopt(connfd, SOL_SOCKET, SO_PEERCRED,
243			&c->peercred, &len) != 0) {
244			log_warn("%s: failed to get peer credentials", __func__);
245			close(connfd);
246			free(c);
247			return;
248			}
249
250			imsg_init(&c->iev.ibuf, connfd);
251			c->iev.handler = control_dispatch_imsg;
252			c->iev.events = EV_READ;
253			c->iev.data = cs;
254			event_set(&c->iev.ev, c->iev.ibuf.fd, c->iev.events,
255			c->iev.handler, c->iev.data);
256			event_add(&c->iev.ev, NULL);
257
258			TAILQ_INSERT_TAIL(&ctl_conns, c, entry);
259			}
260
261			struct ctl_conn *
262			control_connbyfd(int fd)
263			{
264			struct ctl_conn *c;
265
266			TAILQ_FOREACH(c, &ctl_conns, entry) {
267			if (c->iev.ibuf.fd == fd)
268			break;
269			}
270
271			return (c);
272			}
273
274			void
275			control_close(int fd, struct control_sock *cs)
276			{
277			struct ctl_conn *c;
278
279			if ((c = control_connbyfd(fd)) == NULL) {
280			log_warn("%s: fd %d: not found", __func__, fd);
281			return;
282			}
283
284			msgbuf_clear(&c->iev.ibuf.w);
285			TAILQ_REMOVE(&ctl_conns, c, entry);
286
287			event_del(&c->iev.ev);
288			close(c->iev.ibuf.fd);
289
290			/* Some file descriptors are available again. */
291			if (evtimer_pending(&cs->cs_evt, NULL)) {
292			evtimer_del(&cs->cs_evt);
293			event_add(&cs->cs_ev, NULL);
294			}
295
296			free(c);
297			}
298
299			/* ARGSUSED */
300			void
301			control_dispatch_imsg(int fd, short event, void *arg)
302			{
303			struct control_sock *cs = arg;
304			struct privsep *ps = cs->cs_env;
305			struct ctl_conn *c;
306			struct imsg imsg;
307			struct vmop_create_params vmc;
308			struct vmop_id vid;
309			int n, v, ret = 0;
310
311			if ((c = control_connbyfd(fd)) == NULL) {
312			log_warn("%s: fd %d: not found", __func__, fd);
313			return;
314			}
315
316			if (event & EV_READ) {
317			if (((n = imsg_read(&c->iev.ibuf)) == -1 && errno != EAGAIN) \|\|
318			n == 0) {
319			control_close(fd, cs);
320			return;
321			}
322			}
323			if (event & EV_WRITE) {
324			if (msgbuf_write(&c->iev.ibuf.w) <= 0 && errno != EAGAIN) {
325			control_close(fd, cs);
326			return;
327			}
328			}
329
330			for (;;) {
331			if ((n = imsg_get(&c->iev.ibuf, &imsg)) == -1) {
332			control_close(fd, cs);
333			return;
334			}
335
336			if (n == 0)
337			break;
338
339			switch (imsg.hdr.type) {
340			case IMSG_VMDOP_GET_INFO_VM_REQUEST:
341			case IMSG_VMDOP_TERMINATE_VM_REQUEST:
342			case IMSG_VMDOP_START_VM_REQUEST:
343			break;
344			default:
345			if (c->peercred.uid != 0) {
346			log_warnx("denied request %d from uid %d",
347			imsg.hdr.type, c->peercred.uid);
348			ret = EPERM;
349			goto fail;
350			}
351			break;
352			}
353
354			control_imsg_forward(&imsg);
355
356			switch (imsg.hdr.type) {
357			case IMSG_CTL_NOTIFY:
358			if (c->flags & CTL_CONN_NOTIFY) {
359			log_debug("%s: "
360			"client requested notify more than once",
361			__func__);
362			ret = EINVAL;
363			goto fail;
364			}
365			c->flags \|= CTL_CONN_NOTIFY;
366			break;
367			case IMSG_CTL_VERBOSE:
368			if (IMSG_DATA_SIZE(&imsg) < sizeof(v))
369			goto fail;
370			memcpy(&v, imsg.data, sizeof(v));
371			log_setverbose(v);
372
373			/* FALLTHROUGH */
374			case IMSG_VMDOP_RECEIVE_VM_REQUEST:
375			case IMSG_VMDOP_SEND_VM_REQUEST:
376			case IMSG_VMDOP_PAUSE_VM:
377			case IMSG_VMDOP_UNPAUSE_VM:
378			case IMSG_VMDOP_LOAD:
379			case IMSG_VMDOP_RELOAD:
380			case IMSG_CTL_RESET:
381			if (proc_compose_imsg(ps, PROC_PARENT, -1,
382			imsg.hdr.type, fd, imsg.fd,
383			imsg.data, IMSG_DATA_SIZE(&imsg)) == -1)
384			goto fail;
385			break;
386			case IMSG_VMDOP_START_VM_REQUEST:
387			if (IMSG_DATA_SIZE(&imsg) < sizeof(vmc))
388			goto fail;
389			memcpy(&vmc, imsg.data, sizeof(vmc));
390			vmc.vmc_uid = c->peercred.uid;
391			vmc.vmc_gid = -1;
392
393			if (proc_compose_imsg(ps, PROC_PARENT, -1,
394			imsg.hdr.type, fd, -1, &vmc, sizeof(vmc)) == -1) {
395			control_close(fd, cs);
396			return;
397			}
398			break;
399			case IMSG_VMDOP_TERMINATE_VM_REQUEST:
400			if (IMSG_DATA_SIZE(&imsg) < sizeof(vid))
401			goto fail;
402			memcpy(&vid, imsg.data, sizeof(vid));
403			vid.vid_uid = c->peercred.uid;
404			log_debug("%s id: %d, name: %s, uid: %d",
405			__func__, vid.vid_id, vid.vid_name,
406			vid.vid_uid);
407
408			if (proc_compose_imsg(ps, PROC_PARENT, -1,
409			imsg.hdr.type, fd, -1, &vid, sizeof(vid)) == -1) {
410			log_debug("%s: proc_compose_imsg failed",
411			__func__);
412			control_close(fd, cs);
413			return;
414			}
415			break;
416			case IMSG_VMDOP_GET_INFO_VM_REQUEST:
417			if (IMSG_DATA_SIZE(&imsg) != 0)
418			goto fail;
419			if (proc_compose_imsg(ps, PROC_PARENT, -1,
420			imsg.hdr.type, fd, -1, NULL, 0) == -1) {
421			control_close(fd, cs);
422			return;
423			}
424			break;
425			default:
426			log_debug("%s: error handling imsg %d",
427			__func__, imsg.hdr.type);
428			control_close(fd, cs);
429			break;
430			}
431			imsg_free(&imsg);
432			}
433
434			imsg_event_add(&c->iev);
435			return;
436
437			fail:
438			if (ret == 0)
439			ret = EINVAL;
440			imsg_compose_event(&c->iev, IMSG_CTL_FAIL,
441			0, 0, -1, &ret, sizeof(ret));
442			imsg_flush(&c->iev.ibuf);
443			control_close(fd, cs);
444			}
445
446			void
447			control_imsg_forward(struct imsg *imsg)
448			{
449			struct ctl_conn *c;
450
451			TAILQ_FOREACH(c, &ctl_conns, entry)
452			if (c->flags & CTL_CONN_NOTIFY)
453			imsg_compose_event(&c->iev, imsg->hdr.type,
454			imsg->hdr.peerid, imsg->hdr.pid, -1, imsg->data,
455			imsg->hdr.len - IMSG_HEADER_SIZE);
456			}