Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.sbin/httpd/control.c	Lines:	2	145	1.4 %
Date:	2017-11-13	Branches:	1	84	1.2 %


/*	$OpenBSD: control.c,v 1.13 2017/01/09 14:49:22 reyk 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/time.h>
#include <sys/un.h>

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

#include "httpd.h"

#define	CONTROL_BACKLOG	5

struct ctl_connlist ctl_conns;

void		 control_accept(int, short, void *);
void		 control_close(int, struct control_sock *);

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

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

	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) {
		close(connfd);
		log_warn("%s: calloc", __func__);
		return;
	}

	imsg_init(&c->iev.ibuf, connfd);
	c->iev.handler = control_dispatch_imsg;
	c->iev.events = EV_READ;
	c->iev.data = cs;	/* proc.c cheats (reuses the handler) */
	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("%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 ctl_conn		*c;
	struct imsg		 imsg;
	int			 n;
	int			 verbose;
	struct httpd		*env = cs->cs_env;

	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;

		if (c->waiting) {
			log_debug("%s: unexpected imsg %d",
			    __func__, imsg.hdr.type);
			imsg_free(&imsg);
			control_close(fd, cs);
			return;
		}

		switch (imsg.hdr.type) {
		case IMSG_CTL_SHUTDOWN:
		case IMSG_CTL_RELOAD:
		case IMSG_CTL_REOPEN:
			proc_forward_imsg(env->sc_ps, &imsg, PROC_PARENT, -1);
			break;
		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, env->sc_ps->ps_instance + 1, -1,
				    NULL, 0);
				break;
			}
			c->flags |= CTL_CONN_NOTIFY;
			break;
		case IMSG_CTL_VERBOSE:
			IMSG_SIZE_CHECK(&imsg, &verbose);

			memcpy(&verbose, imsg.data, sizeof(verbose));

			proc_forward_imsg(env->sc_ps, &imsg, PROC_PARENT, -1);
			proc_forward_imsg(env->sc_ps, &imsg, PROC_SERVER, -1);

			memcpy(imsg.data, &verbose, sizeof(verbose));
			control_imsg_forward(env->sc_ps, &imsg);
			log_setverbose(verbose);
			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 privsep *ps, 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, ps->ps_instance + 1, -1, imsg->data,
			    imsg->hdr.len - IMSG_HEADER_SIZE);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: control.c,v 1.13 2017/01/09 14:49:22 reyk 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/time.h>
23			#include <sys/un.h>
24
25			#include <errno.h>
26			#include <event.h>
27			#include <fcntl.h>
28			#include <stdlib.h>
29			#include <string.h>
30			#include <unistd.h>
31			#include <imsg.h>
32
33			#include "httpd.h"
34
35			#define CONTROL_BACKLOG 5
36
37			struct ctl_connlist ctl_conns;
38
39			void control_accept(int, short, void *);
40			void control_close(int, struct control_sock *);
41
42			int
43			control_init(struct privsep ps, struct control_sock cs)
44			{
45			struct httpd *env = ps->ps_env;
46			struct sockaddr_un sun;
47			int fd;
48			mode_t old_umask, mode;
49
50			if (cs->cs_name == NULL)
51			return (0);
52
53			if ((fd = socket(AF_UNIX, SOCK_STREAM \| SOCK_NONBLOCK, 0)) == -1) {
54			log_warn("%s: socket", __func__);
55			return (-1);
56			}
57
58			sun.sun_family = AF_UNIX;
59			if (strlcpy(sun.sun_path, cs->cs_name,
60			sizeof(sun.sun_path)) >= sizeof(sun.sun_path)) {
61			log_warn("%s: %s name too long", __func__, cs->cs_name);
62			close(fd);
63			return (-1);
64			}
65
66			if (unlink(cs->cs_name) == -1)
67			if (errno != ENOENT) {
68			log_warn("%s: unlink %s", __func__, cs->cs_name);
69			close(fd);
70			return (-1);
71			}
72
73			if (cs->cs_restricted) {
74			old_umask = umask(S_IXUSR\|S_IXGRP\|S_IXOTH);
75			mode = S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP\|S_IROTH\|S_IWOTH;
76			} else {
77			old_umask = umask(S_IXUSR\|S_IXGRP\|S_IWOTH\|S_IROTH\|S_IXOTH);
78			mode = S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IWGRP;
79			}
80
81			if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
82			log_warn("%s: bind: %s", __func__, cs->cs_name);
83			close(fd);
84			(void)umask(old_umask);
85			return (-1);
86			}
87			(void)umask(old_umask);
88
89			if (chmod(cs->cs_name, mode) == -1) {
90			log_warn("%s: chmod", __func__);
91			close(fd);
92			(void)unlink(cs->cs_name);
93			return (-1);
94			}
95
96			cs->cs_fd = fd;
97			cs->cs_env = env;
98
99			return (0);
100			}
101
102			int
103			control_listen(struct control_sock *cs)
104			{
105			if (cs->cs_name == NULL)
106			return (0);
107
108			if (listen(cs->cs_fd, CONTROL_BACKLOG) == -1) {
109			log_warn("%s: listen", __func__);
110			return (-1);
111			}
112
113			event_set(&cs->cs_ev, cs->cs_fd, EV_READ,
114			control_accept, cs);
115			event_add(&cs->cs_ev, NULL);
116			evtimer_set(&cs->cs_evt, control_accept, cs);
117
118			return (0);
119			}
120
121			void
122			control_cleanup(struct control_sock *cs)
123			{
124	✗✓	96	if (cs->cs_name == NULL)
125			return;
126			event_del(&cs->cs_ev);
127			event_del(&cs->cs_evt);
128		48	}
129
130			/* ARGSUSED */
131			void
132			control_accept(int listenfd, short event, void *arg)
133			{
134			int connfd;
135			socklen_t len;
136			struct sockaddr_un sun;
137			struct ctl_conn *c;
138			struct control_sock *cs = arg;
139
140			event_add(&cs->cs_ev, NULL);
141			if ((event & EV_TIMEOUT))
142			return;
143
144			len = sizeof(sun);
145			if ((connfd = accept4(listenfd,
146			(struct sockaddr *)&sun, &len, SOCK_NONBLOCK)) == -1) {
147			/*
148			* Pause accept if we are out of file descriptors, or
149			* libevent will haunt us here too.
150			*/
151			if (errno == ENFILE \|\| errno == EMFILE) {
152			struct timeval evtpause = { 1, 0 };
153
154			event_del(&cs->cs_ev);
155			evtimer_add(&cs->cs_evt, &evtpause);
156			} else if (errno != EWOULDBLOCK && errno != EINTR &&
157			errno != ECONNABORTED)
158			log_warn("%s: accept", __func__);
159			return;
160			}
161
162			if ((c = calloc(1, sizeof(struct ctl_conn))) == NULL) {
163			close(connfd);
164			log_warn("%s: calloc", __func__);
165			return;
166			}
167
168			imsg_init(&c->iev.ibuf, connfd);
169			c->iev.handler = control_dispatch_imsg;
170			c->iev.events = EV_READ;
171			c->iev.data = cs; /* proc.c cheats (reuses the handler) */
172			event_set(&c->iev.ev, c->iev.ibuf.fd, c->iev.events,
173			c->iev.handler, cs);
174			event_add(&c->iev.ev, NULL);
175
176			TAILQ_INSERT_TAIL(&ctl_conns, c, entry);
177			}
178
179			struct ctl_conn *
180			control_connbyfd(int fd)
181			{
182			struct ctl_conn *c;
183
184			TAILQ_FOREACH(c, &ctl_conns, entry) {
185			if (c->iev.ibuf.fd == fd)
186			break;
187			}
188
189			return (c);
190			}
191
192			void
193			control_close(int fd, struct control_sock *cs)
194			{
195			struct ctl_conn *c;
196
197			if ((c = control_connbyfd(fd)) == NULL) {
198			log_warn("%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(&cs->cs_evt, NULL)) {
210			evtimer_del(&cs->cs_evt);
211			event_add(&cs->cs_ev, NULL);
212			}
213
214			free(c);
215			}
216
217			/* ARGSUSED */
218			void
219			control_dispatch_imsg(int fd, short event, void *arg)
220			{
221			struct control_sock *cs = arg;
222			struct ctl_conn *c;
223			struct imsg imsg;
224			int n;
225			int verbose;
226			struct httpd *env = cs->cs_env;
227
228			if ((c = control_connbyfd(fd)) == NULL) {
229			log_warn("%s: fd %d not found", __func__, fd);
230			return;
231			}
232
233			if (event & EV_READ) {
234			if (((n = imsg_read(&c->iev.ibuf)) == -1 && errno != EAGAIN) \|\|
235			n == 0) {
236			control_close(fd, cs);
237			return;
238			}
239			}
240
241			if (event & EV_WRITE) {
242			if (msgbuf_write(&c->iev.ibuf.w) <= 0 && errno != EAGAIN) {
243			control_close(fd, cs);
244			return;
245			}
246			}
247
248			for (;;) {
249			if ((n = imsg_get(&c->iev.ibuf, &imsg)) == -1) {
250			control_close(fd, cs);
251			return;
252			}
253
254			if (n == 0)
255			break;
256
257			if (c->waiting) {
258			log_debug("%s: unexpected imsg %d",
259			__func__, imsg.hdr.type);
260			imsg_free(&imsg);
261			control_close(fd, cs);
262			return;
263			}
264
265			switch (imsg.hdr.type) {
266			case IMSG_CTL_SHUTDOWN:
267			case IMSG_CTL_RELOAD:
268			case IMSG_CTL_REOPEN:
269			proc_forward_imsg(env->sc_ps, &imsg, PROC_PARENT, -1);
270			break;
271			case IMSG_CTL_NOTIFY:
272			if (c->flags & CTL_CONN_NOTIFY) {
273			log_debug("%s: "
274			"client requested notify more than once",
275			__func__);
276			imsg_compose_event(&c->iev, IMSG_CTL_FAIL,
277			0, env->sc_ps->ps_instance + 1, -1,
278			NULL, 0);
279			break;
280			}
281			c->flags \|= CTL_CONN_NOTIFY;
282			break;
283			case IMSG_CTL_VERBOSE:
284			IMSG_SIZE_CHECK(&imsg, &verbose);
285
286			memcpy(&verbose, imsg.data, sizeof(verbose));
287
288			proc_forward_imsg(env->sc_ps, &imsg, PROC_PARENT, -1);
289			proc_forward_imsg(env->sc_ps, &imsg, PROC_SERVER, -1);
290
291			memcpy(imsg.data, &verbose, sizeof(verbose));
292			control_imsg_forward(env->sc_ps, &imsg);
293			log_setverbose(verbose);
294			break;
295			default:
296			log_debug("%s: error handling imsg %d",
297			__func__, imsg.hdr.type);
298			break;
299			}
300			imsg_free(&imsg);
301			}
302
303			imsg_event_add(&c->iev);
304			}
305
306			void
307			control_imsg_forward(struct privsep ps, struct imsg imsg)
308			{
309			struct ctl_conn *c;
310
311			TAILQ_FOREACH(c, &ctl_conns, entry)
312			if (c->flags & CTL_CONN_NOTIFY)
313			imsg_compose_event(&c->iev, imsg->hdr.type,
314			0, ps->ps_instance + 1, -1, imsg->data,
315			imsg->hdr.len - IMSG_HEADER_SIZE);
316			}