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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.sbin/npppd/npppd/control.c	Lines:	0	157	0.0 %
Date:	2017-11-13	Branches:	0	94	0.0 %


/*	$OpenBSD: control.c,v 1.7 2017/01/09 14:04:31 krw 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/queue.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <netinet/in.h>

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

#include <imsg.h>

#include "log.h"

#define	CONTROL_BACKLOG	5

#include "npppd_local.h"
#include "npppd_ctl.h"

struct ctl_conn_list ctl_conns;

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

int
control_init(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("control_init: socket");
		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("control_init: %s name too long", cs->cs_name);
		close(fd);
		return (-1);
	}

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

	if (chmod(cs->cs_name, mode) == -1) {
		log_warn("control_init: chmod");
		close(fd);
		(void)unlink(cs->cs_name);
		return (-1);
	}
	TAILQ_INIT(&ctl_conns);

	cs->cs_fd = fd;

	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("control_listen: listen");
		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)
{
	struct ctl_conn *c, *nc;

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

	TAILQ_FOREACH_SAFE(c, &ctl_conns, entry, nc)
		control_close(c->iev.ibuf.fd, cs);

	event_del(&cs->cs_ev);
	event_del(&cs->cs_evt);
	(void)unlink(cs->cs_name);
}

#include <stdio.h>
/* ARGSUSED */
void
control_accept(int listenfd, short event, void *arg)
{
	struct control_sock	*cs = (struct control_sock *)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)
			log_warn("control_accept: accept");
		return;
	}

	if ((c = calloc(1, sizeof(struct ctl_conn))) == NULL) {
		log_warn("control_accept");
		close(connfd);
		return;
	}
	if ((c->ctx = npppd_ctl_create(cs->cs_ctx)) == NULL) {
		free(c);
		log_warn("control_accept");
		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, cs);
	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("control_close: fd %d: not found", 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);
	}
	npppd_ctl_destroy(c->ctx);

	free(c);
}

/* ARGSUSED */
void
control_dispatch_imsg(int fd, short event, void *arg)
{
	struct control_sock	*cs = (struct control_sock *)arg;
	struct ctl_conn		*c;
	struct imsg		 imsg;
	int			 n, retval;

	if ((c = control_connbyfd(fd)) == NULL) {
		log_warn("control_dispatch_imsg: fd %d: not found", fd);
		return;
	}


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

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

		if (n == 0)
			break;

		if (cs->cs_restricted || (c->flags & CTL_CONN_LOCKED)) {
			switch (imsg.hdr.type) {
			default:
				log_debug("control_dispatch_imsg: "
				    "client requested restricted command");
				imsg_free(&imsg);
				control_close(fd, cs);
				return;
			}
		}

		switch (imsg.hdr.type) {
		case IMSG_CTL_NOP:
			imsg_compose(&c->iev.ibuf, IMSG_CTL_OK, 0, 0, -1,
			    NULL, 0);
			break;

		case IMSG_CTL_WHO:
		case IMSG_CTL_MONITOR:
		case IMSG_CTL_WHO_AND_MONITOR:
			if (imsg.hdr.type == IMSG_CTL_WHO)
				retval = npppd_ctl_who(c->ctx);
			else if (imsg.hdr.type == IMSG_CTL_MONITOR)
				retval = npppd_ctl_monitor(c->ctx);
			else
				retval = npppd_ctl_who_and_monitor(c->ctx);
			imsg_compose(&c->iev.ibuf,
			    (retval == 0)? IMSG_CTL_OK : IMSG_CTL_FAIL, 0, 0,
			    -1, NULL, 0);
			break;

		case IMSG_CTL_DISCONNECT:
		    {
			struct npppd_disconnect_request  *req;
			struct npppd_disconnect_response  res;

			req = (struct npppd_disconnect_request *)imsg.data;
			retval = npppd_ctl_disconnect(c->ctx,
			    req->ppp_id, req->count);
			res.count = retval;
			imsg_compose(&c->iev.ibuf, IMSG_CTL_OK, 0, 0,
			    -1, &res, sizeof(res));
			break;
		    }
		default:
			imsg_compose(&c->iev.ibuf, IMSG_CTL_FAIL, 0, 0, -1,
			    NULL, 0);
			break;
		}
		imsg_free(&imsg);
	}
	if (!c->iev.ibuf.w.queued)
		npppd_ctl_imsg_compose(c->ctx, &c->iev.ibuf);
	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(&c->iev.ibuf, 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 1.7 2017/01/09 14:04:31 krw 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
19			#include <sys/queue.h>
20			#include <sys/stat.h>
21			#include <sys/socket.h>
22			#include <sys/un.h>
23			#include <net/if.h>
24			#include <net/if_dl.h>
25			#include <netinet/in.h>
26
27			#include <errno.h>
28			#include <event.h>
29			#include <fcntl.h>
30			#include <stdlib.h>
31			#include <string.h>
32			#include <time.h>
33			#include <unistd.h>
34
35			#include <imsg.h>
36
37			#include "log.h"
38
39			#define CONTROL_BACKLOG 5
40
41			#include "npppd_local.h"
42			#include "npppd_ctl.h"
43
44			struct ctl_conn_list ctl_conns;
45
46			struct ctl_conn *control_connbyfd(int);
47			void control_close(int, struct control_sock *);
48			void control_accept (int, short, void *);
49			void control_close (int, struct control_sock *);
50			void control_dispatch_imsg (int, short, void *);
51			void control_imsg_forward (struct imsg *);
52
53			int
54			control_init(struct control_sock *cs)
55			{
56			struct sockaddr_un sun;
57			int fd;
58			mode_t old_umask, mode;
59
60			if (cs->cs_name == NULL)
61			return (0);
62
63			if ((fd = socket(AF_UNIX, SOCK_STREAM \| SOCK_NONBLOCK, 0)) == -1) {
64			log_warn("control_init: socket");
65			return (-1);
66			}
67
68			sun.sun_family = AF_UNIX;
69			if (strlcpy(sun.sun_path, cs->cs_name,
70			sizeof(sun.sun_path)) >= sizeof(sun.sun_path)) {
71			log_warn("control_init: %s name too long", cs->cs_name);
72			close(fd);
73			return (-1);
74			}
75
76			if (unlink(cs->cs_name) == -1)
77			if (errno != ENOENT) {
78			log_warn("control_init: unlink %s", cs->cs_name);
79			close(fd);
80			return (-1);
81			}
82
83			if (cs->cs_restricted) {
84			old_umask = umask(S_IXUSR\|S_IXGRP\|S_IXOTH);
85			mode = S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP\|S_IROTH\|S_IWOTH;
86			} else {
87			old_umask = umask(S_IXUSR\|S_IXGRP\|S_IWOTH\|S_IROTH\|S_IXOTH);
88			mode = S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP;
89			}
90
91			if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
92			log_warn("control_init: bind: %s", cs->cs_name);
93			close(fd);
94			(void)umask(old_umask);
95			return (-1);
96			}
97			(void)umask(old_umask);
98
99			if (chmod(cs->cs_name, mode) == -1) {
100			log_warn("control_init: chmod");
101			close(fd);
102			(void)unlink(cs->cs_name);
103			return (-1);
104			}
105			TAILQ_INIT(&ctl_conns);
106
107			cs->cs_fd = fd;
108
109			return (0);
110			}
111
112			int
113			control_listen(struct control_sock *cs)
114			{
115			if (cs->cs_name == NULL)
116			return (0);
117
118			if (listen(cs->cs_fd, CONTROL_BACKLOG) == -1) {
119			log_warn("control_listen: listen");
120			return (-1);
121			}
122
123			event_set(&cs->cs_ev, cs->cs_fd, EV_READ,
124			control_accept, cs);
125			event_add(&cs->cs_ev, NULL);
126			evtimer_set(&cs->cs_evt, control_accept, cs);
127
128			return (0);
129			}
130
131			void
132			control_cleanup(struct control_sock *cs)
133			{
134			struct ctl_conn c, nc;
135
136			if (cs->cs_name == NULL)
137			return;
138
139			TAILQ_FOREACH_SAFE(c, &ctl_conns, entry, nc)
140			control_close(c->iev.ibuf.fd, cs);
141
142			event_del(&cs->cs_ev);
143			event_del(&cs->cs_evt);
144			(void)unlink(cs->cs_name);
145			}
146
147			#include <stdio.h>
148			/* ARGSUSED */
149			void
150			control_accept(int listenfd, short event, void *arg)
151			{
152			struct control_sock cs = (struct control_sock )arg;
153			int connfd;
154			socklen_t len;
155			struct sockaddr_un sun;
156			struct ctl_conn *c;
157
158			event_add(&cs->cs_ev, NULL);
159			if ((event & EV_TIMEOUT))
160			return;
161
162			len = sizeof(sun);
163			if ((connfd = accept4(listenfd,
164			(struct sockaddr *)&sun, &len, SOCK_NONBLOCK)) == -1) {
165			/*
166			* Pause accept if we are out of file descriptors, or
167			* libevent will haunt us here too.
168			*/
169			if (errno == ENFILE \|\| errno == EMFILE) {
170			struct timeval evtpause = { 1, 0 };
171
172			event_del(&cs->cs_ev);
173			evtimer_add(&cs->cs_evt, &evtpause);
174			} else if (errno != EWOULDBLOCK && errno != EINTR)
175			log_warn("control_accept: accept");
176			return;
177			}
178
179			if ((c = calloc(1, sizeof(struct ctl_conn))) == NULL) {
180			log_warn("control_accept");
181			close(connfd);
182			return;
183			}
184			if ((c->ctx = npppd_ctl_create(cs->cs_ctx)) == NULL) {
185			free(c);
186			log_warn("control_accept");
187			close(connfd);
188			return;
189			}
190
191			imsg_init(&c->iev.ibuf, connfd);
192			c->iev.handler = control_dispatch_imsg;
193			c->iev.events = EV_READ;
194			c->iev.data = cs;
195			event_set(&c->iev.ev, c->iev.ibuf.fd, c->iev.events,
196			c->iev.handler, cs);
197			event_add(&c->iev.ev, NULL);
198
199			TAILQ_INSERT_TAIL(&ctl_conns, c, entry);
200			}
201
202			struct ctl_conn *
203			control_connbyfd(int fd)
204			{
205			struct ctl_conn *c;
206
207			TAILQ_FOREACH(c, &ctl_conns, entry) {
208			if (c->iev.ibuf.fd == fd)
209			break;
210			}
211
212			return (c);
213			}
214
215			void
216			control_close(int fd, struct control_sock *cs)
217			{
218			struct ctl_conn *c;
219
220			if ((c = control_connbyfd(fd)) == NULL) {
221			log_warn("control_close: fd %d: not found", fd);
222			return;
223			}
224
225			msgbuf_clear(&c->iev.ibuf.w);
226			TAILQ_REMOVE(&ctl_conns, c, entry);
227
228			event_del(&c->iev.ev);
229			close(c->iev.ibuf.fd);
230
231			/* Some file descriptors are available again. */
232			if (evtimer_pending(&cs->cs_evt, NULL)) {
233			evtimer_del(&cs->cs_evt);
234			event_add(&cs->cs_ev, NULL);
235			}
236			npppd_ctl_destroy(c->ctx);
237
238			free(c);
239			}
240
241			/* ARGSUSED */
242			void
243			control_dispatch_imsg(int fd, short event, void *arg)
244			{
245			struct control_sock cs = (struct control_sock )arg;
246			struct ctl_conn *c;
247			struct imsg imsg;
248			int n, retval;
249
250			if ((c = control_connbyfd(fd)) == NULL) {
251			log_warn("control_dispatch_imsg: fd %d: not found", fd);
252			return;
253			}
254
255
256			if (event & EV_WRITE) {
257			if (msgbuf_write(&c->iev.ibuf.w) <= 0 && errno != EAGAIN) {
258			control_close(fd, cs);
259			return;
260			}
261			if (!c->iev.ibuf.w.queued)
262			npppd_ctl_imsg_compose(c->ctx, &c->iev.ibuf);
263			imsg_event_add(&c->iev);
264			if (!(event & EV_READ))
265			return;
266			}
267			if (event & EV_READ) {
268			if (((n = imsg_read(&c->iev.ibuf)) == -1 && errno != EAGAIN) \|\|
269			n == 0) {
270			control_close(fd, cs);
271			return;
272			}
273			}
274
275			for (;;) {
276			if ((n = imsg_get(&c->iev.ibuf, &imsg)) == -1) {
277			control_close(fd, cs);
278			return;
279			}
280
281			if (n == 0)
282			break;
283
284			if (cs->cs_restricted \|\| (c->flags & CTL_CONN_LOCKED)) {
285			switch (imsg.hdr.type) {
286			default:
287			log_debug("control_dispatch_imsg: "
288			"client requested restricted command");
289			imsg_free(&imsg);
290			control_close(fd, cs);
291			return;
292			}
293			}
294
295			switch (imsg.hdr.type) {
296			case IMSG_CTL_NOP:
297			imsg_compose(&c->iev.ibuf, IMSG_CTL_OK, 0, 0, -1,
298			NULL, 0);
299			break;
300
301			case IMSG_CTL_WHO:
302			case IMSG_CTL_MONITOR:
303			case IMSG_CTL_WHO_AND_MONITOR:
304			if (imsg.hdr.type == IMSG_CTL_WHO)
305			retval = npppd_ctl_who(c->ctx);
306			else if (imsg.hdr.type == IMSG_CTL_MONITOR)
307			retval = npppd_ctl_monitor(c->ctx);
308			else
309			retval = npppd_ctl_who_and_monitor(c->ctx);
310			imsg_compose(&c->iev.ibuf,
311			(retval == 0)? IMSG_CTL_OK : IMSG_CTL_FAIL, 0, 0,
312			-1, NULL, 0);
313			break;
314
315			case IMSG_CTL_DISCONNECT:
316			{
317			struct npppd_disconnect_request *req;
318			struct npppd_disconnect_response res;
319
320			req = (struct npppd_disconnect_request *)imsg.data;
321			retval = npppd_ctl_disconnect(c->ctx,
322			req->ppp_id, req->count);
323			res.count = retval;
324			imsg_compose(&c->iev.ibuf, IMSG_CTL_OK, 0, 0,
325			-1, &res, sizeof(res));
326			break;
327			}
328			default:
329			imsg_compose(&c->iev.ibuf, IMSG_CTL_FAIL, 0, 0, -1,
330			NULL, 0);
331			break;
332			}
333			imsg_free(&imsg);
334			}
335			if (!c->iev.ibuf.w.queued)
336			npppd_ctl_imsg_compose(c->ctx, &c->iev.ibuf);
337			imsg_event_add(&c->iev);
338			}
339
340			void
341			control_imsg_forward(struct imsg *imsg)
342			{
343			struct ctl_conn *c;
344
345			TAILQ_FOREACH(c, &ctl_conns, entry)
346			if (c->flags & CTL_CONN_NOTIFY)
347			imsg_compose(&c->iev.ibuf, imsg->hdr.type, 0,
348			imsg->hdr.pid, -1, imsg->data,
349			imsg->hdr.len - IMSG_HEADER_SIZE);
350			}