1/*	$NetBSD: server.c,v 1.2 2009/01/24 17:29:28 plunky Exp $	*/
2
3/*-
4 * SPDX-License-Identifier: BSD-2-Clause
5 *
6 * Copyright (c) 2008 Iain Hibbert
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30
31#include <sys/cdefs.h>
32__RCSID("$NetBSD: server.c,v 1.2 2009/01/24 17:29:28 plunky Exp $");
33
34#include <sys/ioctl.h>
35
36#define L2CAP_SOCKET_CHECKED
37#include <bluetooth.h>
38#include <inttypes.h>
39#include <errno.h>
40#include <sdp.h>
41#include <unistd.h>
42
43#include "btpand.h"
44#include "bnep.h"
45
46static struct event	server_ev;
47static int		server_fd;
48static int		server_avail;
49
50static void *		server_ss;
51static uint32_t		server_handle;
52
53static void server_open(void);
54static void server_close(void);
55static void server_read(int, short, void *);
56static void server_register(void);
57
58void
59server_init(void)
60{
61
62	server_fd = -1;
63}
64
65/*
66 * The server_update() function is called whenever the channel count is
67 * changed. We maintain the SDP record and open or close the server socket
68 * as required.
69 */
70void
71server_update(int count)
72{
73
74	if (server_limit == 0)
75		return;
76
77	log_debug("count %d", count);
78
79	server_avail = UINT8_MAX - (count - 1) * UINT8_MAX / server_limit;
80	log_info("Service Availability: %d/%d", server_avail, UINT8_MAX);
81
82	if (server_avail == 0 && server_fd != -1)
83		server_close();
84
85	if (server_avail > 0 && server_fd == -1)
86		server_open();
87
88	if (service_name)
89		server_register();
90}
91
92static void
93server_open(void)
94{
95	struct sockaddr_l2cap sa;
96	uint16_t mru;
97
98	server_fd = socket(PF_BLUETOOTH, SOCK_SEQPACKET, BLUETOOTH_PROTO_L2CAP);
99	if (server_fd == -1) {
100		log_err("Could not open L2CAP socket: %m");
101		exit(EXIT_FAILURE);
102	}
103
104	memset(&sa, 0, sizeof(sa));
105	sa.l2cap_family = AF_BLUETOOTH;
106	sa.l2cap_len = sizeof(sa);
107	sa.l2cap_psm = htole16(l2cap_psm);
108	sa.l2cap_bdaddr_type = BDADDR_BREDR;
109	sa.l2cap_cid = 0;
110
111	bdaddr_copy(&sa.l2cap_bdaddr, &local_bdaddr);
112	if (bind(server_fd, (struct sockaddr *)&sa, sizeof(sa)) == -1) {
113		log_err("Could not bind server socket: %m");
114		exit(EXIT_FAILURE);
115	}
116
117	mru = BNEP_MTU_MIN;
118	if (setsockopt(server_fd, SOL_L2CAP,
119	    SO_L2CAP_IMTU, &mru, sizeof(mru)) == -1) {
120		log_err("Could not set L2CAP IMTU (%d): %m", mru);
121		exit(EXIT_FAILURE);
122	}
123
124	if (listen(server_fd, 0) == -1) {
125		log_err("Could not listen on server socket: %m");
126		exit(EXIT_FAILURE);
127	}
128
129	event_set(&server_ev, server_fd, EV_READ | EV_PERSIST, server_read, NULL);
130	if (event_add(&server_ev, NULL) == -1) {
131		log_err("Could not add server event: %m");
132		exit(EXIT_FAILURE);
133	}
134
135	log_info("server socket open");
136}
137
138static void
139server_close(void)
140{
141
142	event_del(&server_ev);
143	close(server_fd);
144	server_fd = -1;
145
146	log_info("server socket closed");
147}
148
149/*
150 * handle connection request
151 */
152static void
153server_read(int s, short ev, void *arg)
154{
155	struct sockaddr_l2cap ra, la;
156	channel_t *chan;
157	socklen_t len;
158	int fd, n;
159	uint16_t mru, mtu;
160
161	len = sizeof(ra);
162	fd = accept(s, (struct sockaddr *)&ra, &len);
163	if (fd == -1)
164		return;
165
166	n = 1;
167	if (ioctl(fd, FIONBIO, &n) == -1) {
168		log_err("Could not set NonBlocking IO: %m");
169		close(fd);
170		return;
171	}
172
173	len = sizeof(mru);
174	if (getsockopt(fd, SOL_L2CAP, SO_L2CAP_IMTU, &mru, &len) == -1) {
175		log_err("Could not get L2CAP IMTU: %m");
176		close(fd);
177		return;
178	}
179	if(mru < BNEP_MTU_MIN) {
180		log_err("L2CAP IMTU too small (%d)", mru);
181		close(fd);
182		return;
183	}
184
185	len = sizeof(n);
186	if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &n, &len) == -1) {
187		log_err("Could not read SO_RCVBUF");
188		close(fd);
189		return;
190	}
191	if (n < (mru * 10)) {
192		n = mru * 10;
193		if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &n, sizeof(n)) == -1)
194			log_info("Could not increase SO_RCVBUF (from %d)", n);
195	}
196
197	len = sizeof(mtu);
198	if (getsockopt(fd, SOL_L2CAP, SO_L2CAP_OMTU, &mtu, &len) == -1) {
199		log_err("Could not get L2CAP OMTU: %m");
200		close(fd);
201		return;
202	}
203	if (mtu < BNEP_MTU_MIN) {
204		log_err("L2CAP OMTU too small (%d)", mtu);
205		close(fd);
206		return;
207	}
208
209	len = sizeof(n);
210	if (getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &n, &len) == -1) {
211		log_err("Could not get socket send buffer size: %m");
212		close(fd);
213		return;
214	}
215
216	if (n < (mtu * 2)) {
217		n = mtu * 2;
218		if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &n, sizeof(n)) == -1) {
219			log_err("Could not set socket send buffer size (%d): %m", n);
220			close(fd);
221			return;
222		}
223	}
224
225	n = mtu;
226	if (setsockopt(fd, SOL_SOCKET, SO_SNDLOWAT, &n, sizeof(n)) == -1) {
227		log_err("Could not set socket low water mark (%d): %m", n);
228		close(fd);
229		return;
230	}
231
232	len = sizeof(la);
233	if (getsockname(fd, (struct sockaddr *)&la, &len) == -1) {
234		log_err("Could not get socket address: %m");
235		close(fd);
236		return;
237	}
238
239	log_info("Accepted connection from %s", bt_ntoa(&ra.l2cap_bdaddr, NULL));
240
241	chan = channel_alloc();
242	if (chan == NULL) {
243		close(fd);
244		return;
245	}
246
247	chan->send = bnep_send;
248	chan->recv = bnep_recv;
249	chan->mru = mru;
250	chan->mtu = mtu;
251	b2eaddr(chan->raddr, &ra.l2cap_bdaddr);
252	b2eaddr(chan->laddr, &la.l2cap_bdaddr);
253	chan->state = CHANNEL_WAIT_CONNECT_REQ;
254	channel_timeout(chan, 10);
255	if (!channel_open(chan, fd)) {
256		chan->state = CHANNEL_CLOSED;
257		channel_free(chan);
258		close(fd);
259		return;
260	}
261}
262
263static void
264server_register(void)
265{
266	sdp_nap_profile_t p;
267	int rv;
268
269	if (server_ss == NULL) {
270		server_ss = sdp_open_local(control_path);
271		if (server_ss == NULL || sdp_error(server_ss) != 0) {
272			log_err("failed to contact SDP server");
273			return;
274		}
275	}
276
277	memset(&p, 0, sizeof(p));
278	p.psm = l2cap_psm;
279	p.load_factor = server_avail;
280	p.security_description = (l2cap_mode == 0 ? 0x0000 : 0x0001);
281
282	if (server_handle)
283		rv = sdp_change_service(server_ss, server_handle,
284		    (uint8_t *)&p, sizeof(p));
285	else
286		rv = sdp_register_service(server_ss, service_class,
287		    &local_bdaddr, (uint8_t *)&p, sizeof(p), &server_handle);
288
289	if (rv != 0) {
290		errno = sdp_error(server_ss);
291		log_err("%s: %m", service_name);
292		exit(EXIT_FAILURE);
293	}
294}
295