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