server.c revision 285830 
1/*	$NetBSD: server.c,v 1.2 2009/01/24 17:29:28 plunky Exp $	*/
2
3/*-
4 * Copyright (c) 2008 Iain Hibbert
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 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28/* $FreeBSD: releng/10.2/usr.sbin/bluetooth/btpand/server.c 241699 2012-10-18 16:34:00Z emax $ */
29
30#include <sys/cdefs.h>
31__RCSID("$NetBSD: server.c,v 1.2 2009/01/24 17:29:28 plunky Exp $");
32
33#include <sys/ioctl.h>
34
35#include <bluetooth.h>
36#include <inttypes.h>
37#include <errno.h>
38#include <sdp.h>
39#include <unistd.h>
40
41#include "btpand.h"
42#include "bnep.h"
43
44static struct event	server_ev;
45static int		server_fd;
46static int		server_avail;
47
48static void *		server_ss;
49static uint32_t		server_handle;
50
51static void server_open(void);
52static void server_close(void);
53static void server_read(int, short, void *);
54static void server_register(void);
55
56void
57server_init(void)
58{
59
60	server_fd = -1;
61}
62
63/*
64 * The server_update() function is called whenever the channel count is
65 * changed. We maintain the SDP record and open or close the server socket
66 * as required.
67 */
68void
69server_update(int count)
70{
71
72	if (server_limit == 0)
73		return;
74
75	log_debug("count %d", count);
76
77	server_avail = UINT8_MAX - (count - 1) * UINT8_MAX / server_limit;
78	log_info("Service Availability: %d/%d", server_avail, UINT8_MAX);
79
80	if (server_avail == 0 && server_fd != -1)
81		server_close();
82
83	if (server_avail > 0 && server_fd == -1)
84		server_open();
85
86	if (service_name)
87		server_register();
88}
89
90static void
91server_open(void)
92{
93	struct sockaddr_l2cap sa;
94	uint16_t mru;
95
96	server_fd = socket(PF_BLUETOOTH, SOCK_SEQPACKET, BLUETOOTH_PROTO_L2CAP);
97	if (server_fd == -1) {
98		log_err("Could not open L2CAP socket: %m");
99		exit(EXIT_FAILURE);
100	}
101
102	memset(&sa, 0, sizeof(sa));
103	sa.l2cap_family = AF_BLUETOOTH;
104	sa.l2cap_len = sizeof(sa);
105	sa.l2cap_psm = htole16(l2cap_psm);
106	bdaddr_copy(&sa.l2cap_bdaddr, &local_bdaddr);
107	if (bind(server_fd, (struct sockaddr *)&sa, sizeof(sa)) == -1) {
108		log_err("Could not bind server socket: %m");
109		exit(EXIT_FAILURE);
110	}
111
112	mru = BNEP_MTU_MIN;
113	if (setsockopt(server_fd, SOL_L2CAP,
114	    SO_L2CAP_IMTU, &mru, sizeof(mru)) == -1) {
115		log_err("Could not set L2CAP IMTU (%d): %m", mru);
116		exit(EXIT_FAILURE);
117	}
118
119	if (listen(server_fd, 0) == -1) {
120		log_err("Could not listen on server socket: %m");
121		exit(EXIT_FAILURE);
122	}
123
124	event_set(&server_ev, server_fd, EV_READ | EV_PERSIST, server_read, NULL);
125	if (event_add(&server_ev, NULL) == -1) {
126		log_err("Could not add server event: %m");
127		exit(EXIT_FAILURE);
128	}
129
130	log_info("server socket open");
131}
132
133static void
134server_close(void)
135{
136
137	event_del(&server_ev);
138	close(server_fd);
139	server_fd = -1;
140
141	log_info("server socket closed");
142}
143
144/*
145 * handle connection request
146 */
147static void
148server_read(int s, short ev, void *arg)
149{
150	struct sockaddr_l2cap ra, la;
151	channel_t *chan;
152	socklen_t len;
153	int fd, n;
154	uint16_t mru, mtu;
155
156	len = sizeof(ra);
157	fd = accept(s, (struct sockaddr *)&ra, &len);
158	if (fd == -1)
159		return;
160
161	n = 1;
162	if (ioctl(fd, FIONBIO, &n) == -1) {
163		log_err("Could not set NonBlocking IO: %m");
164		close(fd);
165		return;
166	}
167
168	len = sizeof(mru);
169	if (getsockopt(fd, SOL_L2CAP, SO_L2CAP_IMTU, &mru, &len) == -1) {
170		log_err("Could not get L2CAP IMTU: %m");
171		close(fd);
172		return;
173	}
174	if(mru < BNEP_MTU_MIN) {
175		log_err("L2CAP IMTU too small (%d)", mru);
176		close(fd);
177		return;
178	}
179
180	len = sizeof(n);
181	if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &n, &len) == -1) {
182		log_err("Could not read SO_RCVBUF");
183		close(fd);
184		return;
185	}
186	if (n < (mru * 10)) {
187		n = mru * 10;
188		if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &n, sizeof(n)) == -1)
189			log_info("Could not increase SO_RCVBUF (from %d)", n);
190	}
191
192	len = sizeof(mtu);
193	if (getsockopt(fd, SOL_L2CAP, SO_L2CAP_OMTU, &mtu, &len) == -1) {
194		log_err("Could not get L2CAP OMTU: %m");
195		close(fd);
196		return;
197	}
198	if (mtu < BNEP_MTU_MIN) {
199		log_err("L2CAP OMTU too small (%d)", mtu);
200		close(fd);
201		return;
202	}
203
204	len = sizeof(n);
205	if (getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &n, &len) == -1) {
206		log_err("Could not get socket send buffer size: %m");
207		close(fd);
208		return;
209	}
210
211	if (n < (mtu * 2)) {
212		n = mtu * 2;
213		if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &n, sizeof(n)) == -1) {
214			log_err("Could not set socket send buffer size (%d): %m", n);
215			close(fd);
216			return;
217		}
218	}
219
220	n = mtu;
221	if (setsockopt(fd, SOL_SOCKET, SO_SNDLOWAT, &n, sizeof(n)) == -1) {
222		log_err("Could not set socket low water mark (%d): %m", n);
223		close(fd);
224		return;
225	}
226
227	len = sizeof(la);
228	if (getsockname(fd, (struct sockaddr *)&la, &len) == -1) {
229		log_err("Could not get socket address: %m");
230		close(fd);
231		return;
232	}
233
234	log_info("Accepted connection from %s", bt_ntoa(&ra.l2cap_bdaddr, NULL));
235
236	chan = channel_alloc();
237	if (chan == NULL) {
238		close(fd);
239		return;
240	}
241
242	chan->send = bnep_send;
243	chan->recv = bnep_recv;
244	chan->mru = mru;
245	chan->mtu = mtu;
246	b2eaddr(chan->raddr, &ra.l2cap_bdaddr);
247	b2eaddr(chan->laddr, &la.l2cap_bdaddr);
248	chan->state = CHANNEL_WAIT_CONNECT_REQ;
249	channel_timeout(chan, 10);
250	if (!channel_open(chan, fd)) {
251		chan->state = CHANNEL_CLOSED;
252		channel_free(chan);
253		close(fd);
254		return;
255	}
256}
257
258static void
259server_register(void)
260{
261	sdp_nap_profile_t p;
262	int rv;
263
264	if (server_ss == NULL) {
265		server_ss = sdp_open_local(control_path);
266		if (server_ss == NULL || sdp_error(server_ss) != 0) {
267			log_err("failed to contact SDP server");
268			return;
269		}
270	}
271
272	memset(&p, 0, sizeof(p));
273	p.psm = l2cap_psm;
274	p.load_factor = server_avail;
275	p.security_description = (l2cap_mode == 0 ? 0x0000 : 0x0001);
276
277	if (server_handle)
278		rv = sdp_change_service(server_ss, server_handle,
279		    (uint8_t *)&p, sizeof(p));
280	else
281		rv = sdp_register_service(server_ss, service_class,
282		    &local_bdaddr, (uint8_t *)&p, sizeof(p), &server_handle);
283
284	if (rv != 0) {
285		errno = sdp_error(server_ss);
286		log_err("%s: %m", service_name);
287		exit(EXIT_FAILURE);
288	}
289}
290