1 /* $NetBSD: client.c,v 1.7 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: client.c,v 1.7 2012/10/14 08:31:35 plunky Exp $");
30
31 #include <bluetooth.h>
32 #include <errno.h>
33 #include <sdp.h>
34 #include <unistd.h>
35
36 #include "btpand.h"
37 #include "bnep.h"
38
39 __dead static void client_down(channel_t *);
40 static void client_query(void);
41
42 void
client_init(void)43 client_init(void)
44 {
45 struct sockaddr_bt sa;
46 channel_t *chan;
47 socklen_t len;
48 int fd, n;
49 uint16_t mru, mtu;
50
51 if (bdaddr_any(&remote_bdaddr))
52 return;
53
54 if (service_type)
55 client_query();
56
57 fd = socket(PF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP);
58 if (fd == -1) {
59 log_err("Could not open L2CAP socket: %m");
60 exit(EXIT_FAILURE);
61 }
62
63 memset(&sa, 0, sizeof(sa));
64 sa.bt_family = AF_BLUETOOTH;
65 sa.bt_len = sizeof(sa);
66 bdaddr_copy(&sa.bt_bdaddr, &local_bdaddr);
67 if (bind(fd, (struct sockaddr *)&sa, sizeof(sa)) == -1) {
68 log_err("Could not bind client socket: %m");
69 exit(EXIT_FAILURE);
70 }
71
72 if (setsockopt(fd, BTPROTO_L2CAP, SO_L2CAP_LM,
73 &l2cap_mode, sizeof(l2cap_mode)) == -1) {
74 log_err("Could not set link mode (0x%4.4x): %m", l2cap_mode);
75 exit(EXIT_FAILURE);
76 }
77
78 mru = BNEP_MTU_MIN;
79 if (setsockopt(fd, BTPROTO_L2CAP, SO_L2CAP_IMTU,
80 &mru, sizeof(mru)) == -1) {
81 log_err("Could not set L2CAP IMTU (%d): %m", mru);
82 exit(EXIT_FAILURE);
83 }
84
85 log_info("Opening connection to service 0x%4.4x at %s",
86 service_class, bt_ntoa(&remote_bdaddr, NULL));
87
88 sa.bt_psm = l2cap_psm;
89 bdaddr_copy(&sa.bt_bdaddr, &remote_bdaddr);
90 if (connect(fd, (struct sockaddr *)&sa, sizeof(sa)) == -1) {
91 log_err("Could not connect: %m");
92 exit(EXIT_FAILURE);
93 }
94
95 len = sizeof(mru);
96 if (getsockopt(fd, BTPROTO_L2CAP, SO_L2CAP_IMTU, &mru, &len) == -1) {
97 log_err("Could not get IMTU: %m");
98 exit(EXIT_FAILURE);
99 }
100 if (mru < BNEP_MTU_MIN) {
101 log_err("L2CAP IMTU too small (%d)", mru);
102 exit(EXIT_FAILURE);
103 }
104
105 len = sizeof(n);
106 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &n, &len) == -1) {
107 log_err("Could not read SO_RCVBUF");
108 exit(EXIT_FAILURE);
109 }
110 if (n < 10 * mru) {
111 n = 10 * mru;
112 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &n, sizeof(n)) == -1)
113 log_info("Could not increase SO_RCVBUF (to %d)", n);
114 }
115
116 len = sizeof(mtu);
117 if (getsockopt(fd, BTPROTO_L2CAP, SO_L2CAP_OMTU, &mtu, &len) == -1) {
118 log_err("Could not get L2CAP OMTU: %m");
119 exit(EXIT_FAILURE);
120 }
121 if (mtu < BNEP_MTU_MIN) {
122 log_err("L2CAP OMTU too small (%d)", mtu);
123 exit(EXIT_FAILURE);
124 }
125
126 len = sizeof(n);
127 if (getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &n, &len) == -1) {
128 log_err("Could not get socket send buffer size: %m");
129 close(fd);
130 return;
131 }
132 if (n < (mtu * 2)) {
133 n = mtu * 2;
134 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &n, sizeof(n)) == -1) {
135 log_err("Could not set socket send buffer size (%d): %m", n);
136 close(fd);
137 return;
138 }
139 }
140 n = mtu;
141 if (setsockopt(fd, SOL_SOCKET, SO_SNDLOWAT, &n, sizeof(n)) == -1) {
142 log_err("Could not set socket low water mark (%d): %m", n);
143 close(fd);
144 return;
145 }
146
147 chan = channel_alloc();
148 if (chan == NULL)
149 exit(EXIT_FAILURE);
150
151 chan->send = bnep_send;
152 chan->recv = bnep_recv;
153 chan->down = client_down;
154 chan->mru = mru;
155 chan->mtu = mtu;
156 b2eaddr(chan->raddr, &remote_bdaddr);
157 b2eaddr(chan->laddr, &local_bdaddr);
158 chan->state = CHANNEL_WAIT_CONNECT_RSP;
159 channel_timeout(chan, 10);
160 if (!channel_open(chan, fd))
161 exit(EXIT_FAILURE);
162
163 bnep_send_control(chan, BNEP_SETUP_CONNECTION_REQUEST,
164 2, service_class, SDP_SERVICE_CLASS_PANU);
165 }
166
167 static void
client_down(channel_t * chan)168 client_down(channel_t *chan)
169 {
170
171 log_err("Client connection shut down, exiting");
172 exit(EXIT_FAILURE);
173 }
174
175 static void
client_query(void)176 client_query(void)
177 {
178 uint8_t buf[12]; /* enough for SSP and AIL both */
179 sdp_session_t ss;
180 sdp_data_t ssp, ail, rsp, rec, value, pdl, seq;
181 uintmax_t psm;
182 uint16_t attr;
183 bool rv;
184
185 ss = sdp_open(&local_bdaddr, &remote_bdaddr);
186 if (ss == NULL) {
187 log_err("%s: %m", service_type);
188 exit(EXIT_FAILURE);
189 }
190
191 log_info("Searching for %s service at %s",
192 service_type, bt_ntoa(&remote_bdaddr, NULL));
193
194 seq.next = buf;
195 seq.end = buf + sizeof(buf);
196
197 /*
198 * build ServiceSearchPattern (9 bytes)
199 *
200 * uuid16 "service_class"
201 * uuid16 L2CAP
202 * uuid16 BNEP
203 */
204 ssp.next = seq.next;
205 sdp_put_uuid16(&seq, service_class);
206 sdp_put_uuid16(&seq, SDP_UUID_PROTOCOL_L2CAP);
207 sdp_put_uuid16(&seq, SDP_UUID_PROTOCOL_BNEP);
208 ssp.end = seq.next;
209
210 /*
211 * build AttributeIDList (3 bytes)
212 *
213 * uint16 ProtocolDescriptorList
214 */
215 ail.next = seq.next;
216 sdp_put_uint16(&seq, SDP_ATTR_PROTOCOL_DESCRIPTOR_LIST);
217 ail.end = seq.next;
218
219 rv = sdp_service_search_attribute(ss, &ssp, &ail, &rsp);
220 if (!rv) {
221 log_err("%s: %m", service_type);
222 exit(EXIT_FAILURE);
223 }
224
225 /*
226 * we expect the response to contain a list of records
227 * containing a ProtocolDescriptorList. Find the first
228 * one containing L2CAP and BNEP protocols and extract
229 * the PSM.
230 */
231 rv = false;
232 while (!rv && sdp_get_seq(&rsp, &rec)) {
233 if (!sdp_get_attr(&rec, &attr, &value)
234 || attr != SDP_ATTR_PROTOCOL_DESCRIPTOR_LIST)
235 continue;
236
237 sdp_get_alt(&value, &value); /* drop any alt header */
238 while (!rv && sdp_get_seq(&value, &pdl)) {
239 if (sdp_get_seq(&pdl, &seq)
240 && sdp_match_uuid16(&seq, SDP_UUID_PROTOCOL_L2CAP)
241 && sdp_get_uint(&seq, &psm)
242 && sdp_get_seq(&pdl, &seq)
243 && sdp_match_uuid16(&seq, SDP_UUID_PROTOCOL_BNEP))
244 rv = true;
245 }
246 }
247
248 sdp_close(ss);
249
250 if (!rv) {
251 log_err("%s query failed", service_type);
252 exit(EXIT_FAILURE);
253 }
254
255 l2cap_psm = (uint16_t)psm;
256 log_info("Found PSM %u for service %s", l2cap_psm, service_type);
257 }
258