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: stable/9/usr.sbin/bluetooth/btpand/server.c 188013 2009-02-02 18:08:22Z 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
44 static struct event server_ev;
45 static int server_fd;
46 static int server_avail;
47
48 static void * server_ss;
49 static uint32_t server_handle;
50
51 static void server_open(void);
52 static void server_close(void);
53 static void server_read(int, short, void *);
54 static void server_register(void);
55
56 void
server_init(void)57 server_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 */
68 void
server_update(int count)69 server_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
90 static void
server_open(void)91 server_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
133 static void
server_close(void)134 server_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 */
147 static void
server_read(int s,short ev,void * arg)148 server_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(mtu);
181 if (getsockopt(fd, SOL_L2CAP, SO_L2CAP_OMTU, &mtu, &len) == -1) {
182 log_err("Could not get L2CAP OMTU: %m");
183 close(fd);
184 return;
185 }
186 if (mtu < BNEP_MTU_MIN) {
187 log_err("L2CAP OMTU too small (%d)", mtu);
188 close(fd);
189 return;
190 }
191
192 len = sizeof(n);
193 if (getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &n, &len) == -1) {
194 log_err("Could not get socket send buffer size: %m");
195 close(fd);
196 return;
197 }
198
199 if (n < (mtu * 2)) {
200 n = mtu * 2;
201 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &n, sizeof(n)) == -1) {
202 log_err("Could not set socket send buffer size (%d): %m", n);
203 close(fd);
204 return;
205 }
206 }
207
208 n = mtu;
209 if (setsockopt(fd, SOL_SOCKET, SO_SNDLOWAT, &n, sizeof(n)) == -1) {
210 log_err("Could not set socket low water mark (%d): %m", n);
211 close(fd);
212 return;
213 }
214
215 len = sizeof(la);
216 if (getsockname(fd, (struct sockaddr *)&la, &len) == -1) {
217 log_err("Could not get socket address: %m");
218 close(fd);
219 return;
220 }
221
222 log_info("Accepted connection from %s", bt_ntoa(&ra.l2cap_bdaddr, NULL));
223
224 chan = channel_alloc();
225 if (chan == NULL) {
226 close(fd);
227 return;
228 }
229
230 chan->send = bnep_send;
231 chan->recv = bnep_recv;
232 chan->mru = mru;
233 chan->mtu = mtu;
234 b2eaddr(chan->raddr, &ra.l2cap_bdaddr);
235 b2eaddr(chan->laddr, &la.l2cap_bdaddr);
236 chan->state = CHANNEL_WAIT_CONNECT_REQ;
237 channel_timeout(chan, 10);
238 if (!channel_open(chan, fd)) {
239 chan->state = CHANNEL_CLOSED;
240 channel_free(chan);
241 close(fd);
242 return;
243 }
244 }
245
246 static void
server_register(void)247 server_register(void)
248 {
249 sdp_nap_profile_t p;
250 int rv;
251
252 if (server_ss == NULL) {
253 server_ss = sdp_open_local(control_path);
254 if (server_ss == NULL || sdp_error(server_ss) != 0) {
255 log_err("failed to contact SDP server");
256 return;
257 }
258 }
259
260 memset(&p, 0, sizeof(p));
261 p.psm = l2cap_psm;
262 p.load_factor = server_avail;
263 p.security_description = (l2cap_mode == 0 ? 0x0000 : 0x0001);
264
265 if (server_handle)
266 rv = sdp_change_service(server_ss, server_handle,
267 (uint8_t *)&p, sizeof(p));
268 else
269 rv = sdp_register_service(server_ss, service_class,
270 &local_bdaddr, (uint8_t *)&p, sizeof(p), &server_handle);
271
272 if (rv != 0) {
273 errno = sdp_error(server_ss);
274 log_err("%s: %m", service_name);
275 exit(EXIT_FAILURE);
276 }
277 }
278