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 /* $FreeBSD$ */
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 #define L2CAP_SOCKET_CHECKED
36 #include <bluetooth.h>
37 #include <inttypes.h>
38 #include <errno.h>
39 #include <sdp.h>
40 #include <unistd.h>
41
42 #include "btpand.h"
43 #include "bnep.h"
44
45 static struct event server_ev;
46 static int server_fd;
47 static int server_avail;
48
49 static void * server_ss;
50 static uint32_t server_handle;
51
52 static void server_open(void);
53 static void server_close(void);
54 static void server_read(int, short, void *);
55 static void server_register(void);
56
57 void
server_init(void)58 server_init(void)
59 {
60
61 server_fd = -1;
62 }
63
64 /*
65 * The server_update() function is called whenever the channel count is
66 * changed. We maintain the SDP record and open or close the server socket
67 * as required.
68 */
69 void
server_update(int count)70 server_update(int count)
71 {
72
73 if (server_limit == 0)
74 return;
75
76 log_debug("count %d", count);
77
78 server_avail = UINT8_MAX - (count - 1) * UINT8_MAX / server_limit;
79 log_info("Service Availability: %d/%d", server_avail, UINT8_MAX);
80
81 if (server_avail == 0 && server_fd != -1)
82 server_close();
83
84 if (server_avail > 0 && server_fd == -1)
85 server_open();
86
87 if (service_name)
88 server_register();
89 }
90
91 static void
server_open(void)92 server_open(void)
93 {
94 struct sockaddr_l2cap sa;
95 uint16_t mru;
96
97 server_fd = socket(PF_BLUETOOTH, SOCK_SEQPACKET, BLUETOOTH_PROTO_L2CAP);
98 if (server_fd == -1) {
99 log_err("Could not open L2CAP socket: %m");
100 exit(EXIT_FAILURE);
101 }
102
103 memset(&sa, 0, sizeof(sa));
104 sa.l2cap_family = AF_BLUETOOTH;
105 sa.l2cap_len = sizeof(sa);
106 sa.l2cap_psm = htole16(l2cap_psm);
107 sa.l2cap_bdaddr_type = BDADDR_BREDR;
108 sa.l2cap_cid = 0;
109
110 bdaddr_copy(&sa.l2cap_bdaddr, &local_bdaddr);
111 if (bind(server_fd, (struct sockaddr *)&sa, sizeof(sa)) == -1) {
112 log_err("Could not bind server socket: %m");
113 exit(EXIT_FAILURE);
114 }
115
116 mru = BNEP_MTU_MIN;
117 if (setsockopt(server_fd, SOL_L2CAP,
118 SO_L2CAP_IMTU, &mru, sizeof(mru)) == -1) {
119 log_err("Could not set L2CAP IMTU (%d): %m", mru);
120 exit(EXIT_FAILURE);
121 }
122
123 if (listen(server_fd, 0) == -1) {
124 log_err("Could not listen on server socket: %m");
125 exit(EXIT_FAILURE);
126 }
127
128 event_set(&server_ev, server_fd, EV_READ | EV_PERSIST, server_read, NULL);
129 if (event_add(&server_ev, NULL) == -1) {
130 log_err("Could not add server event: %m");
131 exit(EXIT_FAILURE);
132 }
133
134 log_info("server socket open");
135 }
136
137 static void
server_close(void)138 server_close(void)
139 {
140
141 event_del(&server_ev);
142 close(server_fd);
143 server_fd = -1;
144
145 log_info("server socket closed");
146 }
147
148 /*
149 * handle connection request
150 */
151 static void
server_read(int s,short ev,void * arg)152 server_read(int s, short ev, void *arg)
153 {
154 struct sockaddr_l2cap ra, la;
155 channel_t *chan;
156 socklen_t len;
157 int fd, n;
158 uint16_t mru, mtu;
159
160 len = sizeof(ra);
161 fd = accept(s, (struct sockaddr *)&ra, &len);
162 if (fd == -1)
163 return;
164
165 n = 1;
166 if (ioctl(fd, FIONBIO, &n) == -1) {
167 log_err("Could not set NonBlocking IO: %m");
168 close(fd);
169 return;
170 }
171
172 len = sizeof(mru);
173 if (getsockopt(fd, SOL_L2CAP, SO_L2CAP_IMTU, &mru, &len) == -1) {
174 log_err("Could not get L2CAP IMTU: %m");
175 close(fd);
176 return;
177 }
178 if(mru < BNEP_MTU_MIN) {
179 log_err("L2CAP IMTU too small (%d)", mru);
180 close(fd);
181 return;
182 }
183
184 len = sizeof(n);
185 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &n, &len) == -1) {
186 log_err("Could not read SO_RCVBUF");
187 close(fd);
188 return;
189 }
190 if (n < (mru * 10)) {
191 n = mru * 10;
192 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &n, sizeof(n)) == -1)
193 log_info("Could not increase SO_RCVBUF (from %d)", n);
194 }
195
196 len = sizeof(mtu);
197 if (getsockopt(fd, SOL_L2CAP, SO_L2CAP_OMTU, &mtu, &len) == -1) {
198 log_err("Could not get L2CAP OMTU: %m");
199 close(fd);
200 return;
201 }
202 if (mtu < BNEP_MTU_MIN) {
203 log_err("L2CAP OMTU too small (%d)", mtu);
204 close(fd);
205 return;
206 }
207
208 len = sizeof(n);
209 if (getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &n, &len) == -1) {
210 log_err("Could not get socket send buffer size: %m");
211 close(fd);
212 return;
213 }
214
215 if (n < (mtu * 2)) {
216 n = mtu * 2;
217 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &n, sizeof(n)) == -1) {
218 log_err("Could not set socket send buffer size (%d): %m", n);
219 close(fd);
220 return;
221 }
222 }
223
224 n = mtu;
225 if (setsockopt(fd, SOL_SOCKET, SO_SNDLOWAT, &n, sizeof(n)) == -1) {
226 log_err("Could not set socket low water mark (%d): %m", n);
227 close(fd);
228 return;
229 }
230
231 len = sizeof(la);
232 if (getsockname(fd, (struct sockaddr *)&la, &len) == -1) {
233 log_err("Could not get socket address: %m");
234 close(fd);
235 return;
236 }
237
238 log_info("Accepted connection from %s", bt_ntoa(&ra.l2cap_bdaddr, NULL));
239
240 chan = channel_alloc();
241 if (chan == NULL) {
242 close(fd);
243 return;
244 }
245
246 chan->send = bnep_send;
247 chan->recv = bnep_recv;
248 chan->mru = mru;
249 chan->mtu = mtu;
250 b2eaddr(chan->raddr, &ra.l2cap_bdaddr);
251 b2eaddr(chan->laddr, &la.l2cap_bdaddr);
252 chan->state = CHANNEL_WAIT_CONNECT_REQ;
253 channel_timeout(chan, 10);
254 if (!channel_open(chan, fd)) {
255 chan->state = CHANNEL_CLOSED;
256 channel_free(chan);
257 close(fd);
258 return;
259 }
260 }
261
262 static void
server_register(void)263 server_register(void)
264 {
265 sdp_nap_profile_t p;
266 int rv;
267
268 if (server_ss == NULL) {
269 server_ss = sdp_open_local(control_path);
270 if (server_ss == NULL || sdp_error(server_ss) != 0) {
271 log_err("failed to contact SDP server");
272 return;
273 }
274 }
275
276 memset(&p, 0, sizeof(p));
277 p.psm = l2cap_psm;
278 p.load_factor = server_avail;
279 p.security_description = (l2cap_mode == 0 ? 0x0000 : 0x0001);
280
281 if (server_handle)
282 rv = sdp_change_service(server_ss, server_handle,
283 (uint8_t *)&p, sizeof(p));
284 else
285 rv = sdp_register_service(server_ss, service_class,
286 &local_bdaddr, (uint8_t *)&p, sizeof(p), &server_handle);
287
288 if (rv != 0) {
289 errno = sdp_error(server_ss);
290 log_err("%s: %m", service_name);
291 exit(EXIT_FAILURE);
292 }
293 }
294