Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.sbin/ldpd/control.c	Lines:	0	129	0.0 %
Date:	2017-11-13	Branches:	0	81	0.0 %


/*	$OpenBSD: control.c,v 1.29 2017/03/03 23:30:57 renato 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/stat.h>
#include <sys/un.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "ldpd.h"
#include "ldpe.h"
#include "log.h"
#include "control.h"

#define	CONTROL_BACKLOG	5

static void		 control_accept(int, short, void *);
static struct ctl_conn	*control_connbyfd(int);
static struct ctl_conn	*control_connbypid(pid_t);
static void		 control_close(int);
static void		 control_dispatch_imsg(int, short, void *);

struct ctl_conns	 ctl_conns;

static int		 control_fd;

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_fd = fd;

	return (0);
}

int
control_listen(void)
{
	if (listen(control_fd, CONTROL_BACKLOG) == -1) {
		log_warn("%s: listen", __func__);
		return (-1);
	}

	return (accept_add(control_fd, control_accept, NULL));
}

void
control_cleanup(char *path)
{
	accept_del(control_fd);
	close(control_fd);
	unlink(path);
}

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

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

static 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);
}

static 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);
}

static 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);
	accept_unpause();
	free(c);
}

/* ARGSUSED */
static void
control_dispatch_imsg(int fd, short event, void *bula)
{
	struct ctl_conn	*c;
	struct imsg	 imsg;
	ssize_t		 n;
	unsigned int	 ifidx;
	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_FIB_COUPLE:
		case IMSG_CTL_FIB_DECOUPLE:
		case IMSG_CTL_RELOAD:
			c->iev.ibuf.pid = imsg.hdr.pid;
			ldpe_imsg_compose_parent(imsg.hdr.type, 0, NULL, 0);
			break;
		case IMSG_CTL_KROUTE:
		case IMSG_CTL_KROUTE_ADDR:
		case IMSG_CTL_IFINFO:
			c->iev.ibuf.pid = imsg.hdr.pid;
			ldpe_imsg_compose_parent(imsg.hdr.type,
			    imsg.hdr.pid, imsg.data,
			    imsg.hdr.len - IMSG_HEADER_SIZE);
			break;
		case IMSG_CTL_SHOW_INTERFACE:
			if (imsg.hdr.len == IMSG_HEADER_SIZE +
			    sizeof(ifidx)) {
				memcpy(&ifidx, imsg.data, sizeof(ifidx));
				ldpe_iface_ctl(c, ifidx);
				imsg_compose_event(&c->iev, IMSG_CTL_END, 0,
				    0, -1, NULL, 0);
			}
			break;
		case IMSG_CTL_SHOW_DISCOVERY:
			ldpe_adj_ctl(c);
			break;
		case IMSG_CTL_SHOW_LIB:
		case IMSG_CTL_SHOW_L2VPN_PW:
		case IMSG_CTL_SHOW_L2VPN_BINDING:
			c->iev.ibuf.pid = imsg.hdr.pid;
			ldpe_imsg_compose_lde(imsg.hdr.type, 0, imsg.hdr.pid,
			    imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE);
			break;
		case IMSG_CTL_SHOW_NBR:
			ldpe_nbr_ctl(c);
			break;
		case IMSG_CTL_CLEAR_NBR:
			if (imsg.hdr.len != IMSG_HEADER_SIZE +
			    sizeof(struct ctl_nbr))
				break;

			nbr_clear_ctl(imsg.data);
			break;
		case IMSG_CTL_LOG_VERBOSE:
			if (imsg.hdr.len != IMSG_HEADER_SIZE +
			    sizeof(verbose))
				break;

			/* forward to other processes */
			ldpe_imsg_compose_parent(imsg.hdr.type, imsg.hdr.pid,
			    imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE);
			ldpe_imsg_compose_lde(imsg.hdr.type, 0, imsg.hdr.pid,
			    imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE);

			memcpy(&verbose, imsg.data, sizeof(verbose));
			log_verbose(verbose);
			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 1.29 2017/03/03 23:30:57 renato 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/types.h>
20			#include <sys/stat.h>
21			#include <sys/un.h>
22			#include <errno.h>
23			#include <stdlib.h>
24			#include <string.h>
25			#include <unistd.h>
26
27			#include "ldpd.h"
28			#include "ldpe.h"
29			#include "log.h"
30			#include "control.h"
31
32			#define CONTROL_BACKLOG 5
33
34			static void control_accept(int, short, void *);
35			static struct ctl_conn *control_connbyfd(int);
36			static struct ctl_conn *control_connbypid(pid_t);
37			static void control_close(int);
38			static void control_dispatch_imsg(int, short, void *);
39
40			struct ctl_conns ctl_conns;
41
42			static int control_fd;
43
44			int
45			control_init(char *path)
46			{
47			struct sockaddr_un sun;
48			int fd;
49			mode_t old_umask;
50
51			if ((fd = socket(AF_UNIX, SOCK_STREAM \| SOCK_CLOEXEC \| SOCK_NONBLOCK,
52			0)) == -1) {
53			log_warn("%s: socket", __func__);
54			return (-1);
55			}
56
57			memset(&sun, 0, sizeof(sun));
58			sun.sun_family = AF_UNIX;
59			strlcpy(sun.sun_path, path, sizeof(sun.sun_path));
60
61			if (unlink(path) == -1)
62			if (errno != ENOENT) {
63			log_warn("%s: unlink %s", __func__, path);
64			close(fd);
65			return (-1);
66			}
67
68			old_umask = umask(S_IXUSR\|S_IXGRP\|S_IWOTH\|S_IROTH\|S_IXOTH);
69			if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
70			log_warn("%s: bind: %s", __func__, path);
71			close(fd);
72			umask(old_umask);
73			return (-1);
74			}
75			umask(old_umask);
76
77			if (chmod(path, S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP) == -1) {
78			log_warn("%s: chmod", __func__);
79			close(fd);
80			(void)unlink(path);
81			return (-1);
82			}
83
84			control_fd = fd;
85
86			return (0);
87			}
88
89			int
90			control_listen(void)
91			{
92			if (listen(control_fd, CONTROL_BACKLOG) == -1) {
93			log_warn("%s: listen", __func__);
94			return (-1);
95			}
96
97			return (accept_add(control_fd, control_accept, NULL));
98			}
99
100			void
101			control_cleanup(char *path)
102			{
103			accept_del(control_fd);
104			close(control_fd);
105			unlink(path);
106			}
107
108			/* ARGSUSED */
109			static void
110			control_accept(int listenfd, short event, void *bula)
111			{
112			int connfd;
113			socklen_t len;
114			struct sockaddr_un sun;
115			struct ctl_conn *c;
116
117			len = sizeof(sun);
118			if ((connfd = accept4(listenfd, (struct sockaddr *)&sun, &len,
119			SOCK_NONBLOCK \| SOCK_CLOEXEC)) == -1) {
120			/*
121			* Pause accept if we are out of file descriptors, or
122			* libevent will haunt us here too.
123			*/
124			if (errno == ENFILE \|\| errno == EMFILE)
125			accept_pause();
126			else if (errno != EWOULDBLOCK && errno != EINTR &&
127			errno != ECONNABORTED)
128			log_warn("%s: accept4", __func__);
129			return;
130			}
131
132			if ((c = calloc(1, sizeof(struct ctl_conn))) == NULL) {
133			log_warn(__func__);
134			close(connfd);
135			return;
136			}
137
138			imsg_init(&c->iev.ibuf, connfd);
139			c->iev.handler = control_dispatch_imsg;
140			c->iev.events = EV_READ;
141			event_set(&c->iev.ev, c->iev.ibuf.fd, c->iev.events,
142			c->iev.handler, &c->iev);
143			event_add(&c->iev.ev, NULL);
144
145			TAILQ_INSERT_TAIL(&ctl_conns, c, entry);
146			}
147
148			static struct ctl_conn *
149			control_connbyfd(int fd)
150			{
151			struct ctl_conn *c;
152
153			TAILQ_FOREACH(c, &ctl_conns, entry) {
154			if (c->iev.ibuf.fd == fd)
155			break;
156			}
157
158			return (c);
159			}
160
161			static struct ctl_conn *
162			control_connbypid(pid_t pid)
163			{
164			struct ctl_conn *c;
165
166			TAILQ_FOREACH(c, &ctl_conns, entry) {
167			if (c->iev.ibuf.pid == pid)
168			break;
169			}
170
171			return (c);
172			}
173
174			static void
175			control_close(int fd)
176			{
177			struct ctl_conn *c;
178
179			if ((c = control_connbyfd(fd)) == NULL) {
180			log_warnx("%s: fd %d: not found", __func__, fd);
181			return;
182			}
183
184			msgbuf_clear(&c->iev.ibuf.w);
185			TAILQ_REMOVE(&ctl_conns, c, entry);
186
187			event_del(&c->iev.ev);
188			close(c->iev.ibuf.fd);
189			accept_unpause();
190			free(c);
191			}
192
193			/* ARGSUSED */
194			static void
195			control_dispatch_imsg(int fd, short event, void *bula)
196			{
197			struct ctl_conn *c;
198			struct imsg imsg;
199			ssize_t n;
200			unsigned int ifidx;
201			int verbose;
202
203			if ((c = control_connbyfd(fd)) == NULL) {
204			log_warnx("%s: fd %d: not found", __func__, fd);
205			return;
206			}
207
208			if (event & EV_READ) {
209			if (((n = imsg_read(&c->iev.ibuf)) == -1 && errno != EAGAIN) \|\|
210			n == 0) {
211			control_close(fd);
212			return;
213			}
214			}
215			if (event & EV_WRITE) {
216			if (msgbuf_write(&c->iev.ibuf.w) <= 0 && errno != EAGAIN) {
217			control_close(fd);
218			return;
219			}
220			}
221
222			for (;;) {
223			if ((n = imsg_get(&c->iev.ibuf, &imsg)) == -1) {
224			control_close(fd);
225			return;
226			}
227
228			if (n == 0)
229			break;
230
231			switch (imsg.hdr.type) {
232			case IMSG_CTL_FIB_COUPLE:
233			case IMSG_CTL_FIB_DECOUPLE:
234			case IMSG_CTL_RELOAD:
235			c->iev.ibuf.pid = imsg.hdr.pid;
236			ldpe_imsg_compose_parent(imsg.hdr.type, 0, NULL, 0);
237			break;
238			case IMSG_CTL_KROUTE:
239			case IMSG_CTL_KROUTE_ADDR:
240			case IMSG_CTL_IFINFO:
241			c->iev.ibuf.pid = imsg.hdr.pid;
242			ldpe_imsg_compose_parent(imsg.hdr.type,
243			imsg.hdr.pid, imsg.data,
244			imsg.hdr.len - IMSG_HEADER_SIZE);
245			break;
246			case IMSG_CTL_SHOW_INTERFACE:
247			if (imsg.hdr.len == IMSG_HEADER_SIZE +
248			sizeof(ifidx)) {
249			memcpy(&ifidx, imsg.data, sizeof(ifidx));
250			ldpe_iface_ctl(c, ifidx);
251			imsg_compose_event(&c->iev, IMSG_CTL_END, 0,
252			0, -1, NULL, 0);
253			}
254			break;
255			case IMSG_CTL_SHOW_DISCOVERY:
256			ldpe_adj_ctl(c);
257			break;
258			case IMSG_CTL_SHOW_LIB:
259			case IMSG_CTL_SHOW_L2VPN_PW:
260			case IMSG_CTL_SHOW_L2VPN_BINDING:
261			c->iev.ibuf.pid = imsg.hdr.pid;
262			ldpe_imsg_compose_lde(imsg.hdr.type, 0, imsg.hdr.pid,
263			imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE);
264			break;
265			case IMSG_CTL_SHOW_NBR:
266			ldpe_nbr_ctl(c);
267			break;
268			case IMSG_CTL_CLEAR_NBR:
269			if (imsg.hdr.len != IMSG_HEADER_SIZE +
270			sizeof(struct ctl_nbr))
271			break;
272
273			nbr_clear_ctl(imsg.data);
274			break;
275			case IMSG_CTL_LOG_VERBOSE:
276			if (imsg.hdr.len != IMSG_HEADER_SIZE +
277			sizeof(verbose))
278			break;
279
280			/* forward to other processes */
281			ldpe_imsg_compose_parent(imsg.hdr.type, imsg.hdr.pid,
282			imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE);
283			ldpe_imsg_compose_lde(imsg.hdr.type, 0, imsg.hdr.pid,
284			imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE);
285
286			memcpy(&verbose, imsg.data, sizeof(verbose));
287			log_verbose(verbose);
288			break;
289			default:
290			log_debug("%s: error handling imsg %d", __func__,
291			imsg.hdr.type);
292			break;
293			}
294			imsg_free(&imsg);
295			}
296
297			imsg_event_add(&c->iev);
298			}
299
300			int
301			control_imsg_relay(struct imsg *imsg)
302			{
303			struct ctl_conn *c;
304
305			if ((c = control_connbypid(imsg->hdr.pid)) == NULL)
306			return (0);
307
308			return (imsg_compose_event(&c->iev, imsg->hdr.type, 0, imsg->hdr.pid,
309			-1, imsg->data, imsg->hdr.len - IMSG_HEADER_SIZE));
310			}