xref: /netbsd-src/usr.sbin/btpand/server.c (revision c61317e3bf5092d043ad515e3631c97eeba79180)
1 /*	$NetBSD: server.c,v 1.8 2012/10/14 08:31:35 plunky Exp $	*/
2 
3 /*-
4  * Copyright (c) 2008-2009 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 #include <sys/cdefs.h>
29 __RCSID("$NetBSD: server.c,v 1.8 2012/10/14 08:31:35 plunky Exp $");
30 
31 #include <sys/ioctl.h>
32 
33 #include <net/ethertypes.h>
34 
35 #include <bluetooth.h>
36 #include <errno.h>
37 #include <sdp.h>
38 #include <unistd.h>
39 
40 #include "btpand.h"
41 #include "bnep.h"
42 
43 static struct event	server_ev;
44 static int		server_count;
45 
46 static sdp_session_t	server_ss;
47 static uint32_t		server_handle;
48 static sdp_data_t	server_record;
49 
50 static char *		server_ipv4_subnet;
51 static char *		server_ipv6_subnet;
52 static uint16_t		server_proto[] = { ETHERTYPE_IP, ETHERTYPE_ARP, ETHERTYPE_IPV6 };
53 static size_t		server_nproto = __arraycount(server_proto);
54 
55 static void server_open(void);
56 static void server_read(int, short, void *);
57 static void server_down(channel_t *);
58 static void server_update(void);
59 static void server_mkrecord(void);
60 
61 void
server_init(void)62 server_init(void)
63 {
64 
65 	if (server_limit == 0)
66 		return;
67 
68 	server_open();
69 	server_update();
70 }
71 
72 /*
73  * Start listening on server socket
74  */
75 static void
server_open(void)76 server_open(void)
77 {
78 	struct sockaddr_bt sa;
79 	socklen_t len;
80 	uint16_t mru;
81 	int fd;
82 
83 	fd = socket(PF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP);
84 	if (fd == -1) {
85 		log_err("Could not open L2CAP socket: %m");
86 		exit(EXIT_FAILURE);
87 	}
88 
89 	memset(&sa, 0, sizeof(sa));
90 	sa.bt_family = AF_BLUETOOTH;
91 	sa.bt_len = sizeof(sa);
92 	sa.bt_psm = l2cap_psm;
93 	bdaddr_copy(&sa.bt_bdaddr, &local_bdaddr);
94 	if (bind(fd, (struct sockaddr *)&sa, sizeof(sa)) == -1) {
95 		log_err("Could not bind server socket: %m");
96 		exit(EXIT_FAILURE);
97 	}
98 
99 	if (setsockopt(fd, BTPROTO_L2CAP,
100 	    SO_L2CAP_LM, &l2cap_mode, sizeof(l2cap_mode)) == -1) {
101 		log_err("Could not set link mode (0x%4.4x): %m", l2cap_mode);
102 		exit(EXIT_FAILURE);
103 	}
104 	len = sizeof(l2cap_mode);
105 	getsockopt(fd, BTPROTO_L2CAP, SO_L2CAP_LM, &l2cap_mode, &len);
106 
107 	mru = BNEP_MTU_MIN;
108 	if (setsockopt(fd, BTPROTO_L2CAP,
109 	    SO_L2CAP_IMTU, &mru, sizeof(mru)) == -1) {
110 		log_err("Could not set L2CAP IMTU (%d): %m", mru);
111 		exit(EXIT_FAILURE);
112 	}
113 
114 	if (listen(fd, 0) == -1) {
115 		log_err("Could not listen on server socket: %m");
116 		exit(EXIT_FAILURE);
117 	}
118 
119 	event_set(&server_ev, fd, EV_READ | EV_PERSIST, server_read, NULL);
120 	if (event_add(&server_ev, NULL) == -1) {
121 		log_err("Could not add server event: %m");
122 		exit(EXIT_FAILURE);
123 	}
124 
125 	log_info("server socket open");
126 }
127 
128 /*
129  * handle connection request
130  */
131 static void
server_read(int s,short ev,void * arg)132 server_read(int s, short ev, void *arg)
133 {
134 	struct sockaddr_bt ra, la;
135 	channel_t *chan;
136 	socklen_t len;
137 	int fd, n;
138 	uint16_t mru, mtu;
139 
140 	assert(server_count < server_limit);
141 
142 	len = sizeof(ra);
143 	fd = accept(s, (struct sockaddr *)&ra, &len);
144 	if (fd == -1)
145 		return;
146 
147 	n = 1;
148 	if (ioctl(fd, FIONBIO, &n) == -1) {
149 		log_err("Could not set NonBlocking IO: %m");
150 		close(fd);
151 		return;
152 	}
153 
154 	len = sizeof(mru);
155 	if (getsockopt(fd, BTPROTO_L2CAP, SO_L2CAP_IMTU, &mru, &len) == -1) {
156 		log_err("Could not get L2CAP IMTU: %m");
157 		close(fd);
158 		return;
159 	}
160 	if(mru < BNEP_MTU_MIN) {
161 		log_err("L2CAP IMTU too small (%d)", mru);
162 		close(fd);
163 		return;
164 	}
165 
166 	len = sizeof(n);
167 	if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &n, &len) == -1) {
168 		log_err("Could not read SO_RCVBUF");
169 		close(fd);
170 		return;
171 	}
172 	if (n < 10 * mru) {
173 		n = 10 * mru;
174 		if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &n, sizeof(n)) == -1)
175 			log_info("Could not increase SO_RCVBUF (to %d)", n);
176 	}
177 
178 	len = sizeof(mtu);
179 	if (getsockopt(fd, BTPROTO_L2CAP, SO_L2CAP_OMTU, &mtu, &len) == -1) {
180 		log_err("Could not get L2CAP OMTU: %m");
181 		close(fd);
182 		return;
183 	}
184 	if (mtu < BNEP_MTU_MIN) {
185 		log_err("L2CAP OMTU too small (%d)", mtu);
186 		close(fd);
187 		return;
188 	}
189 
190 	len = sizeof(n);
191 	if (getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &n, &len) == -1) {
192 		log_err("Could not get socket send buffer size: %m");
193 		close(fd);
194 		return;
195 	}
196 	if (n < (mtu * 2)) {
197 		n = mtu * 2;
198 		if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &n, sizeof(n)) == -1) {
199 			log_err("Could not set socket send buffer size (%d): %m", n);
200 			close(fd);
201 			return;
202 		}
203 	}
204 	n = mtu;
205 	if (setsockopt(fd, SOL_SOCKET, SO_SNDLOWAT, &n, sizeof(n)) == -1) {
206 		log_err("Could not set socket low water mark (%d): %m", n);
207 		close(fd);
208 		return;
209 	}
210 
211 	len = sizeof(la);
212 	if (getsockname(fd, (struct sockaddr *)&la, &len) == -1) {
213 		log_err("Could not get socket address: %m");
214 		close(fd);
215 		return;
216 	}
217 
218 	log_info("Accepted connection from %s", bt_ntoa(&ra.bt_bdaddr, NULL));
219 
220 	chan = channel_alloc();
221 	if (chan == NULL) {
222 		close(fd);
223 		return;
224 	}
225 
226 	chan->send = bnep_send;
227 	chan->recv = bnep_recv;
228 	chan->down = server_down;
229 	chan->mru = mru;
230 	chan->mtu = mtu;
231 	b2eaddr(chan->raddr, &ra.bt_bdaddr);
232 	b2eaddr(chan->laddr, &la.bt_bdaddr);
233 	chan->state = CHANNEL_WAIT_CONNECT_REQ;
234 	channel_timeout(chan, 10);
235 	if (!channel_open(chan, fd)) {
236 		chan->state = CHANNEL_CLOSED;
237 		channel_free(chan);
238 		close(fd);
239 		return;
240 	}
241 
242 	if (++server_count == server_limit) {
243 		log_info("Server limit reached, closing server socket");
244 		event_del(&server_ev);
245 		close(s);
246 	}
247 
248 	server_update();
249 }
250 
251 /*
252  * Shut down a server channel, we need to update the service record and
253  * may want to restart accepting connections on the server socket
254  */
255 static void
server_down(channel_t * chan)256 server_down(channel_t *chan)
257 {
258 
259 	assert(server_count > 0);
260 
261 	channel_close(chan);
262 
263 	if (server_count-- == server_limit)
264 		server_open();
265 
266 	server_update();
267 }
268 
269 static void
server_update(void)270 server_update(void)
271 {
272 	bool rv;
273 
274 	if (service_type == NULL)
275 		return;
276 
277 	if (server_ss == NULL) {
278 		server_ss = sdp_open_local(control_path);
279 		if (server_ss == NULL) {
280 			log_err("failed to contact SDP server");
281 			return;
282 		}
283 	}
284 
285 	server_mkrecord();
286 
287 	if (server_handle == 0)
288 		rv = sdp_record_insert(server_ss, &local_bdaddr,
289 		    &server_handle, &server_record);
290 	else
291 		rv = sdp_record_update(server_ss, server_handle,
292 		    &server_record);
293 
294 	if (!rv) {
295 		log_err("%s: %m", service_type);
296 		exit(EXIT_FAILURE);
297 	}
298 }
299 
300 static void
server_mkrecord(void)301 server_mkrecord(void)
302 {
303 	static uint8_t data[256];	/* tis enough */
304 	sdp_data_t buf;
305 	size_t i;
306 
307 	buf.next = data;
308 	buf.end = data + sizeof(data);
309 
310 	sdp_put_uint16(&buf, SDP_ATTR_SERVICE_RECORD_HANDLE);
311 	sdp_put_uint32(&buf, 0x00000000);
312 
313 	sdp_put_uint16(&buf, SDP_ATTR_SERVICE_CLASS_ID_LIST);
314 	sdp_put_seq(&buf, 3);
315 	sdp_put_uuid16(&buf, service_class);
316 
317 	sdp_put_uint16(&buf, SDP_ATTR_PROTOCOL_DESCRIPTOR_LIST);
318 	sdp_put_seq(&buf, 8 + 10 + 3 * server_nproto);
319 	sdp_put_seq(&buf, 6);
320 	sdp_put_uuid16(&buf, SDP_UUID_PROTOCOL_L2CAP);
321 	sdp_put_uint16(&buf, l2cap_psm);
322 	sdp_put_seq(&buf, 8 + 3 * server_nproto);
323 	sdp_put_uuid16(&buf, SDP_UUID_PROTOCOL_BNEP);
324 	sdp_put_uint16(&buf, 0x0100);	/* v1.0 */
325 	sdp_put_seq(&buf, 3 * server_nproto);
326 	for (i = 0; i < server_nproto; i++)
327 		sdp_put_uint16(&buf, server_proto[i]);
328 
329 	sdp_put_uint16(&buf, SDP_ATTR_BROWSE_GROUP_LIST);
330 	sdp_put_seq(&buf, 3);
331 	sdp_put_uuid16(&buf, SDP_SERVICE_CLASS_PUBLIC_BROWSE_GROUP);
332 
333 	sdp_put_uint16(&buf, SDP_ATTR_LANGUAGE_BASE_ATTRIBUTE_ID_LIST);
334 	sdp_put_seq(&buf, 9);
335 	sdp_put_uint16(&buf, 0x656e);	/* "en" */
336 	sdp_put_uint16(&buf, 106);	/* UTF-8 */
337 	sdp_put_uint16(&buf, SDP_ATTR_PRIMARY_LANGUAGE_BASE_ID);
338 
339 	sdp_put_uint16(&buf, SDP_ATTR_SERVICE_AVAILABILITY);
340 	sdp_put_uint8(&buf, (UINT8_MAX - server_count * UINT8_MAX / server_limit));
341 
342 	sdp_put_uint16(&buf, SDP_ATTR_BLUETOOTH_PROFILE_DESCRIPTOR_LIST);
343 	sdp_put_seq(&buf, 8);
344 	sdp_put_seq(&buf, 6);
345 	sdp_put_uuid16(&buf, service_class);
346 	sdp_put_uint16(&buf, 0x0100);	/* v1.0 */
347 
348 	sdp_put_uint16(&buf, SDP_ATTR_PRIMARY_LANGUAGE_BASE_ID
349 	    + SDP_ATTR_SERVICE_NAME_OFFSET);
350 	sdp_put_str(&buf, service_name, -1);
351 
352 	sdp_put_uint16(&buf, SDP_ATTR_PRIMARY_LANGUAGE_BASE_ID
353 	    + SDP_ATTR_SERVICE_DESCRIPTION_OFFSET);
354 	sdp_put_str(&buf, service_desc, -1);
355 
356 	sdp_put_uint16(&buf, SDP_ATTR_SECURITY_DESCRIPTION);
357 	sdp_put_uint16(&buf, (l2cap_mode & L2CAP_LM_AUTH) ?  0x0001 : 0x0000);
358 
359 	if (service_class == SDP_SERVICE_CLASS_NAP) {
360 		sdp_put_uint16(&buf, SDP_ATTR_NET_ACCESS_TYPE);
361 		sdp_put_uint16(&buf, 0x0004);	/* 10Mb Ethernet */
362 
363 		sdp_put_uint16(&buf, SDP_ATTR_MAX_NET_ACCESS_RATE);
364 		sdp_put_uint32(&buf, IF_Mbps(10) / 8);	/* octets/second */
365 	}
366 
367 	if (service_class == SDP_SERVICE_CLASS_NAP
368 	    || service_class == SDP_SERVICE_CLASS_GN) {
369 		if (server_ipv4_subnet) {
370 			sdp_put_uint16(&buf, SDP_ATTR_IPV4_SUBNET);
371 			sdp_put_str(&buf, server_ipv4_subnet, -1);
372 		}
373 
374 		if (server_ipv6_subnet) {
375 			sdp_put_uint16(&buf, SDP_ATTR_IPV6_SUBNET);
376 			sdp_put_str(&buf, server_ipv6_subnet, -1);
377 		}
378 	}
379 
380 	server_record.next = data;
381 	server_record.end = buf.next;
382 }
383