control.c revision 1.4 
1/*	$OpenBSD: control.c,v 1.4 2010/12/21 13:24:11 mikeb Exp $	*/
2/*	$vantronix: control.c,v 1.4 2010/05/14 07:35:52 reyk Exp $	*/
3
4/*
5 * Copyright (c) 2010 Reyk Floeter <reyk@vantronix.net>
6 * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
7 *
8 * Permission to use, copy, modify, and distribute this software for any
9 * purpose with or without fee is hereby granted, provided that the above
10 * copyright notice and this permission notice appear in all copies.
11 *
12 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
13 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
14 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
15 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
16 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19 */
20
21#include <sys/queue.h>
22#include <sys/param.h>
23#include <sys/types.h>
24#include <sys/stat.h>
25#include <sys/socket.h>
26#include <sys/un.h>
27#include <sys/tree.h>
28
29#include <net/if.h>
30
31#include <errno.h>
32#include <event.h>
33#include <fcntl.h>
34#include <stdlib.h>
35#include <string.h>
36#include <unistd.h>
37#include <signal.h>
38
39#include "iked.h"
40
41#define	CONTROL_BACKLOG	5
42
43struct ctl_connlist ctl_conns;
44
45void
46	 control_accept(int, short, void *);
47struct ctl_conn
48	*control_connbyfd(int);
49void	 control_close(int);
50void	 control_dispatch_imsg(int, short, void *);
51void	 control_imsg_forward(struct imsg *);
52
53int
54control_init(struct iked *env, 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, 0)) == -1) {
64		log_warn("%s: socket", __func__);
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("%s: %s name too long", __func__, 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("%s: unlink %s", __func__, 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("%s: bind: %s", __func__, 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("%s: chmod", __func__);
101		close(fd);
102		(void)unlink(cs->cs_name);
103		return (-1);
104	}
105
106	socket_set_blockmode(fd, BM_NONBLOCK);
107	cs->cs_fd = fd;
108	cs->cs_env = env;
109
110	return (0);
111}
112
113int
114control_listen(struct control_sock *cs)
115{
116	if (cs->cs_name == NULL)
117		return (0);
118
119	if (listen(cs->cs_fd, CONTROL_BACKLOG) == -1) {
120		log_warn("%s: listen", __func__);
121		return (-1);
122	}
123
124	event_set(&cs->cs_ev, cs->cs_fd, EV_READ | EV_PERSIST,
125	    control_accept, cs->cs_env);
126	event_add(&cs->cs_ev, NULL);
127
128	return (0);
129}
130
131void
132control_cleanup(struct control_sock *cs)
133{
134	if (cs->cs_name == NULL)
135		return;
136	(void)unlink(cs->cs_name);
137}
138
139/* ARGSUSED */
140void
141control_accept(int listenfd, short event, void *arg)
142{
143	struct iked		*env = arg;
144	int			 connfd;
145	socklen_t		 len;
146	struct sockaddr_un	 sun;
147	struct ctl_conn		*c;
148
149	len = sizeof(sun);
150	if ((connfd = accept(listenfd,
151	    (struct sockaddr *)&sun, &len)) == -1) {
152		if (errno != EWOULDBLOCK && errno != EINTR)
153			log_warn("%s: accept", __func__);
154		return;
155	}
156
157	socket_set_blockmode(connfd, BM_NONBLOCK);
158
159	if ((c = calloc(1, sizeof(struct ctl_conn))) == NULL) {
160		log_warn("%s", __func__);
161		close(connfd);
162		return;
163	}
164
165	imsg_init(&c->iev.ibuf, connfd);
166	c->iev.handler = control_dispatch_imsg;
167	c->iev.events = EV_READ;
168	event_set(&c->iev.ev, c->iev.ibuf.fd, c->iev.events,
169	    c->iev.handler, env);
170	event_add(&c->iev.ev, NULL);
171
172	TAILQ_INSERT_TAIL(&ctl_conns, c, entry);
173}
174
175struct ctl_conn *
176control_connbyfd(int fd)
177{
178	struct ctl_conn	*c;
179
180	for (c = TAILQ_FIRST(&ctl_conns); c != NULL && c->iev.ibuf.fd != fd;
181	    c = TAILQ_NEXT(c, entry))
182		;	/* nothing */
183
184	return (c);
185}
186
187void
188control_close(int fd)
189{
190	struct ctl_conn	*c;
191
192	if ((c = control_connbyfd(fd)) == NULL) {
193		log_warn("%s: fd %d: not found", __func__, fd);
194		return;
195	}
196
197	msgbuf_clear(&c->iev.ibuf.w);
198	TAILQ_REMOVE(&ctl_conns, c, entry);
199
200	event_del(&c->iev.ev);
201	close(c->iev.ibuf.fd);
202	free(c);
203}
204
205/* ARGSUSED */
206void
207control_dispatch_imsg(int fd, short event, void *arg)
208{
209	struct iked		*env = arg;
210	struct ctl_conn		*c;
211	struct imsg		 imsg;
212	int			 n, v;
213
214	if ((c = control_connbyfd(fd)) == NULL) {
215		log_warn("%s: fd %d: not found", __func__, fd);
216		return;
217	}
218
219	switch (event) {
220	case EV_READ:
221		if ((n = imsg_read(&c->iev.ibuf)) == -1 || n == 0) {
222			control_close(fd);
223			return;
224		}
225		break;
226	case EV_WRITE:
227		if (msgbuf_write(&c->iev.ibuf.w) < 0) {
228			control_close(fd);
229			return;
230		}
231		imsg_event_add(&c->iev);
232		return;
233	default:
234		fatalx("unknown event");
235	}
236
237	for (;;) {
238		if ((n = imsg_get(&c->iev.ibuf, &imsg)) == -1) {
239			control_close(fd);
240			return;
241		}
242
243		if (n == 0)
244			break;
245
246		control_imsg_forward(&imsg);
247
248		switch (imsg.hdr.type) {
249		case IMSG_CTL_NOTIFY:
250			if (c->flags & CTL_CONN_NOTIFY) {
251				log_debug("%s: "
252				    "client requested notify more than once",
253				    __func__);
254				imsg_compose_event(&c->iev, IMSG_CTL_FAIL,
255				    0, 0, -1, NULL, 0);
256				break;
257			}
258			c->flags |= CTL_CONN_NOTIFY;
259			break;
260		case IMSG_CTL_VERBOSE:
261			IMSG_SIZE_CHECK(&imsg, &v);
262
263			memcpy(&v, imsg.data, sizeof(v));
264			log_verbose(v);
265
266			imsg_forward_proc(env, &imsg, PROC_PARENT);
267			imsg_forward_proc(env, &imsg, PROC_IKEV2);
268			imsg_forward_proc(env, &imsg, PROC_IKEV1);
269			break;
270		case IMSG_CTL_RELOAD:
271		case IMSG_CTL_RESET:
272		case IMSG_CTL_COUPLE:
273		case IMSG_CTL_DECOUPLE:
274		case IMSG_CTL_ACTIVE:
275		case IMSG_CTL_PASSIVE:
276			imsg_forward_proc(env, &imsg, PROC_PARENT);
277			break;
278		default:
279			log_debug("%s: error handling imsg %d",
280			    __func__, imsg.hdr.type);
281			break;
282		}
283		imsg_free(&imsg);
284	}
285
286	imsg_event_add(&c->iev);
287}
288
289void
290control_imsg_forward(struct imsg *imsg)
291{
292	struct ctl_conn *c;
293
294	TAILQ_FOREACH(c, &ctl_conns, entry)
295		if (c->flags & CTL_CONN_NOTIFY)
296			imsg_compose(&c->iev.ibuf, imsg->hdr.type,
297			    0, imsg->hdr.pid, -1, imsg->data,
298			    imsg->hdr.len - IMSG_HEADER_SIZE);
299}
300