client.c revision 1.1 
1/*	$NetBSD: client.c,v 1.1 2006/06/19 15:44:56 gdamore Exp $	*/
2
3/*-
4 * Copyright (c) 2006 Itronix Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. The name of Itronix Inc. may not be used to endorse
16 *    or promote products derived from this software without specific
17 *    prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY ITRONIX INC. ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL ITRONIX INC. BE LIABLE FOR ANY
23 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
24 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
26 * ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33__RCSID("$NetBSD: client.c,v 1.1 2006/06/19 15:44:56 gdamore Exp $");
34
35#include <sys/ioctl.h>
36#include <sys/queue.h>
37#include <sys/time.h>
38#include <sys/un.h>
39#include <bluetooth.h>
40#include <errno.h>
41#include <event.h>
42#include <fcntl.h>
43#include <stdlib.h>
44#include <string.h>
45#include <syslog.h>
46#include <unistd.h>
47
48#include "bthcid.h"
49
50/*
51 * A client is anybody who connects to our control socket to
52 * receive PIN requests.
53 */
54struct client {
55	struct event		ev;
56	int			fd;		/* client descriptor */
57	LIST_ENTRY(client)	next;
58};
59
60/*
61 * PIN cache items are made when we have sent a client pin
62 * request. The event is used to expire the item.
63 */
64struct item {
65	struct event	 ev;
66	bdaddr_t	 laddr;			/* local device BDADDR */
67	bdaddr_t	 raddr;			/* remote device BDADDR */
68	uint8_t		 pin[HCI_PIN_SIZE];	/* PIN */
69	int		 hci;			/* HCI socket */
70	LIST_ENTRY(item) next;
71};
72
73static struct event		control_ev;
74
75static LIST_HEAD(,client)	client_list;
76static LIST_HEAD(,item)		item_list;
77
78static void process_control	(int, short, void *);
79static void process_client	(int, short, void *);
80static void process_item	(int, short, void *);
81
82#define PIN_REQUEST_TIMEOUT	30	/* Request is valid */
83#define PIN_TIMEOUT		300	/* PIN is valid */
84
85int
86init_control(const char *name, mode_t mode)
87{
88	struct sockaddr_un	un;
89	int			ctl;
90
91	LIST_INIT(&client_list);
92	LIST_INIT(&item_list);
93
94	if (name == NULL)
95		return 0;
96
97	if (unlink(name) < 0 && errno != ENOENT)
98		return -1;
99
100	ctl = socket(PF_LOCAL, SOCK_STREAM, 0);
101	if (ctl < 0)
102		return -1;
103
104	memset(&un, 0, sizeof(un));
105	un.sun_len = sizeof(un);
106	un.sun_family = AF_LOCAL;
107	strlcpy(un.sun_path, name, sizeof(un.sun_path));
108	if (bind(ctl, (struct sockaddr *)&un, sizeof(un)) < 0) {
109		close(ctl);
110		return -1;
111	}
112
113	if (chmod(name, mode) < 0) {
114		close(ctl);
115		unlink(name);
116		return -1;
117	}
118
119	if (listen(ctl, 10) < 0) {
120		close(ctl);
121		unlink(name);
122		return -1;
123	}
124
125	event_set(&control_ev, ctl, EV_READ | EV_PERSIST, process_control, NULL);
126	if (event_add(&control_ev, NULL) < 0) {
127		close(ctl);
128		unlink(name);
129		return -1;
130	}
131
132	return 0;
133}
134
135/* Process control socket event */
136static void
137process_control(int sock, short ev, void *arg)
138{
139	struct sockaddr_un	un;
140	socklen_t		n;
141	int			fd;
142	struct client		*cl;
143
144	n = sizeof(un);
145	fd = accept(sock, (struct sockaddr *)&un, &n);
146	if (fd < 0) {
147		syslog(LOG_ERR, "Could not accept PIN client connection");
148		return;
149	}
150
151	n = 1;
152	if (ioctl(fd, FIONBIO, &n) < 0) {
153		syslog(LOG_ERR, "Could not set non blocking IO for client");
154		close(fd);
155		return;
156	}
157
158	cl = malloc(sizeof(struct client));
159	if (cl == NULL) {
160		syslog(LOG_ERR, "Could not malloc client");
161		close(fd);
162		return;
163	}
164
165	memset(cl, 0, sizeof(struct client));
166	cl->fd = fd;
167
168	event_set(&cl->ev, fd, EV_READ | EV_PERSIST, process_client, cl);
169	if (event_add(&cl->ev, NULL) < 0) {
170		syslog(LOG_ERR, "Could not add client event");
171		free(cl);
172		close(fd);
173		return;
174	}
175
176	syslog(LOG_DEBUG, "New Client");
177	LIST_INSERT_HEAD(&client_list, cl, next);
178}
179
180/* Process client response packet */
181static void
182process_client(int sock, short ev, void *arg)
183{
184	client_pin_response_t	 rp;
185	struct timeval		 tv;
186	struct sockaddr_bt	 sa;
187	struct client		*cl = arg;
188	struct item		*item;
189	int			 n;
190
191	n = recv(sock, &rp, sizeof(rp), 0);
192	if (n != sizeof(rp)) {
193		if (n != 0)
194			syslog(LOG_ERR, "Bad Client");
195
196		close(sock);
197		LIST_REMOVE(cl, next);
198		free(cl);
199
200		syslog(LOG_DEBUG, "Client Closed");
201		return;
202	}
203
204	syslog(LOG_DEBUG, "New PIN for %s", bt_ntoa(&rp.raddr, NULL));
205
206	LIST_FOREACH(item, &item_list, next) {
207		if (bdaddr_same(&rp.laddr, &item->laddr) == 0
208		    || bdaddr_same(&rp.raddr, &item->raddr) == 0)
209			continue;
210
211		evtimer_del(&item->ev);
212		if (item->hci != -1) {
213			memset(&sa, 0, sizeof(sa));
214			sa.bt_len = sizeof(sa);
215			sa.bt_family = AF_BLUETOOTH;
216			bdaddr_copy(&sa.bt_bdaddr, &item->laddr);
217
218			send_pin_code_reply(item->hci, &sa, &item->raddr, rp.pin);
219		}
220		goto newpin;
221	}
222
223	item = malloc(sizeof(struct item));
224	if (item == NULL) {
225		syslog(LOG_ERR, "Item allocation failed");
226		return;
227	}
228
229	memset(item, 0, sizeof(struct item));
230	bdaddr_copy(&item->laddr, &rp.laddr);
231	bdaddr_copy(&item->raddr, &rp.raddr);
232	evtimer_set(&item->ev, process_item, item);
233	LIST_INSERT_HEAD(&item_list, item, next);
234
235newpin:
236	memcpy(item->pin, rp.pin, HCI_PIN_SIZE);
237	item->hci = -1;
238
239	tv.tv_sec = PIN_TIMEOUT;
240	tv.tv_usec = 0;
241
242	if (evtimer_add(&item->ev, &tv) < 0) {
243		syslog(LOG_ERR, "Cannot add event timer for item");
244		LIST_REMOVE(item, next);
245		free(item);
246	}
247}
248
249/* Send PIN request to client */
250int
251send_client_request(bdaddr_t *laddr, bdaddr_t *raddr, int hci)
252{
253	client_pin_request_t	 cp;
254	struct client		*cl;
255	struct item		*item;
256	int			 n = 0;
257	struct timeval		 tv;
258
259	memset(&cp, 0, sizeof(cp));
260	bdaddr_copy(&cp.laddr, laddr);
261	bdaddr_copy(&cp.raddr, raddr);
262	cp.time = PIN_REQUEST_TIMEOUT;
263
264	LIST_FOREACH(cl, &client_list, next) {
265		if (send(cl->fd, &cp, sizeof(cp), 0) != sizeof(cp))
266			syslog(LOG_ERR, "send PIN request failed");
267		else
268			n++;
269	}
270
271	if (n == 0)
272		return 0;
273
274	syslog(LOG_DEBUG, "Sent PIN requests to %d client%s.",
275				n, (n == 1 ? "" : "s"));
276
277	item = malloc(sizeof(struct item));
278	if (item == NULL) {
279		syslog(LOG_ERR, "Cannot allocate PIN request item");
280		return 0;
281	}
282
283	memset(item, 0, sizeof(struct item));
284	bdaddr_copy(&item->laddr, laddr);
285	bdaddr_copy(&item->raddr, raddr);
286	item->hci = hci;
287	evtimer_set(&item->ev, process_item, item);
288
289	tv.tv_sec = cp.time;
290	tv.tv_usec = 0;
291
292	if (evtimer_add(&item->ev, &tv) < 0) {
293		syslog(LOG_ERR, "Cannot add request timer");
294		free(item);
295		return 0;
296	}
297
298	LIST_INSERT_HEAD(&item_list, item, next);
299	return 1;
300}
301
302/* Process item event (by expiring it) */
303static void
304process_item(int fd, short ev, void *arg)
305{
306	struct item *item = arg;
307
308	syslog(LOG_DEBUG, "PIN for %s expired", bt_ntoa(&item->raddr, NULL));
309
310	LIST_REMOVE(item, next);
311	free(item);
312}
313
314/* lookup PIN in item cache */
315uint8_t *
316lookup_item(bdaddr_t *laddr, bdaddr_t *raddr)
317{
318	struct item *item;
319
320	LIST_FOREACH(item, &item_list, next) {
321		if (bdaddr_same(raddr, &item->raddr) == 0)
322			continue;
323
324		if (bdaddr_same(laddr, &item->laddr) == 0
325		    && bdaddr_any(&item->laddr) == 0)
326			continue;
327
328		if (item->hci >= 0)
329			break;
330
331		syslog(LOG_DEBUG, "Matched PIN from cache");
332		return item->pin;
333	}
334
335	return NULL;
336}
337