1 /* $NetBSD: client.c,v 1.2 2008/12/06 20:01:14 plunky Exp $ */
2
3 /*-
4 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
5 *
6 * Copyright (c) 2008 Iain Hibbert
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 /* $FreeBSD$ */
31
32 #include <sys/cdefs.h>
33 __RCSID("$NetBSD: client.c,v 1.2 2008/12/06 20:01:14 plunky Exp $");
34
35 #define L2CAP_SOCKET_CHECKED
36 #include <bluetooth.h>
37 #include <errno.h>
38 #include <sdp.h>
39 #include <unistd.h>
40
41 #include "btpand.h"
42 #include "bnep.h"
43 #include "sdp.h"
44
45 static void client_query(void);
46
47 void
client_init(void)48 client_init(void)
49 {
50 struct sockaddr_l2cap sa;
51 channel_t *chan;
52 socklen_t len;
53 int fd, n;
54 uint16_t mru, mtu;
55
56 if (bdaddr_any(&remote_bdaddr))
57 return;
58
59 if (service_name)
60 client_query();
61
62 fd = socket(PF_BLUETOOTH, SOCK_SEQPACKET, BLUETOOTH_PROTO_L2CAP);
63 if (fd == -1) {
64 log_err("Could not open L2CAP socket: %m");
65 exit(EXIT_FAILURE);
66 }
67
68 memset(&sa, 0, sizeof(sa));
69 sa.l2cap_family = AF_BLUETOOTH;
70 sa.l2cap_len = sizeof(sa);
71 sa.l2cap_bdaddr_type = BDADDR_BREDR;
72 sa.l2cap_cid = 0;
73
74 bdaddr_copy(&sa.l2cap_bdaddr, &local_bdaddr);
75 if (bind(fd, (struct sockaddr *)&sa, sizeof(sa)) == -1) {
76 log_err("Could not bind client socket: %m");
77 exit(EXIT_FAILURE);
78 }
79
80 mru = BNEP_MTU_MIN;
81 if (setsockopt(fd, SOL_L2CAP, SO_L2CAP_IMTU, &mru, sizeof(mru)) == -1) {
82 log_err("Could not set L2CAP IMTU (%d): %m", mru);
83 exit(EXIT_FAILURE);
84 }
85
86 log_info("Opening connection to service 0x%4.4x at %s",
87 service_class, bt_ntoa(&remote_bdaddr, NULL));
88
89 sa.l2cap_psm = htole16(l2cap_psm);
90 bdaddr_copy(&sa.l2cap_bdaddr, &remote_bdaddr);
91 if (connect(fd, (struct sockaddr *)&sa, sizeof(sa)) == -1) {
92 log_err("Could not connect: %m");
93 exit(EXIT_FAILURE);
94 }
95
96 len = sizeof(mru);
97 if (getsockopt(fd, SOL_L2CAP, SO_L2CAP_IMTU, &mru, &len) == -1) {
98 log_err("Could not get IMTU: %m");
99 exit(EXIT_FAILURE);
100 }
101 if (mru < BNEP_MTU_MIN) {
102 log_err("L2CAP IMTU too small (%d)", mru);
103 exit(EXIT_FAILURE);
104 }
105
106 len = sizeof(n);
107 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &n, &len) == -1) {
108 log_err("Could not read SO_RCVBUF");
109 exit(EXIT_FAILURE);
110 }
111 if (n < (mru * 10)) {
112 n = mru * 10;
113 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &n, sizeof(n)) == -1)
114 log_info("Could not increase SO_RCVBUF (from %d)", n);
115 }
116
117 len = sizeof(mtu);
118 if (getsockopt(fd, SOL_L2CAP, SO_L2CAP_OMTU, &mtu, &len) == -1) {
119 log_err("Could not get L2CAP OMTU: %m");
120 exit(EXIT_FAILURE);
121 }
122 if (mtu < BNEP_MTU_MIN) {
123 log_err("L2CAP OMTU too small (%d)", mtu);
124 exit(EXIT_FAILURE);
125 }
126
127 len = sizeof(n);
128 if (getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &n, &len) == -1) {
129 log_err("Could not get socket send buffer size: %m");
130 close(fd);
131 return;
132 }
133 if (n < (mtu * 2)) {
134 n = mtu * 2;
135 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &n, sizeof(n)) == -1) {
136 log_err("Could not set socket send buffer size (%d): %m", n);
137 close(fd);
138 return;
139 }
140 }
141 n = mtu;
142 if (setsockopt(fd, SOL_SOCKET, SO_SNDLOWAT, &n, sizeof(n)) == -1) {
143 log_err("Could not set socket low water mark (%d): %m", n);
144 close(fd);
145 return;
146 }
147
148 chan = channel_alloc();
149 if (chan == NULL)
150 exit(EXIT_FAILURE);
151
152 chan->send = bnep_send;
153 chan->recv = bnep_recv;
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_query(void)168 client_query(void)
169 {
170 uint8_t buffer[512];
171 sdp_attr_t attr;
172 uint32_t range;
173 void *ss;
174 int rv;
175 uint8_t *seq0, *seq1;
176
177 attr.flags = SDP_ATTR_INVALID;
178 attr.attr = 0;
179 attr.vlen = sizeof(buffer);
180 attr.value = buffer;
181
182 range = SDP_ATTR_RANGE(SDP_ATTR_PROTOCOL_DESCRIPTOR_LIST,
183 SDP_ATTR_PROTOCOL_DESCRIPTOR_LIST);
184
185 ss = sdp_open(&local_bdaddr, &remote_bdaddr);
186 if (ss == NULL || (errno = sdp_error(ss)) != 0) {
187 log_err("%s: %m", service_name);
188 exit(EXIT_FAILURE);
189 }
190
191 log_info("Searching for %s service at %s",
192 service_name, bt_ntoa(&remote_bdaddr, NULL));
193
194 rv = sdp_search(ss, 1, &service_class, 1, &range, 1, &attr);
195 if (rv != 0) {
196 log_err("%s: %s", service_name, strerror(sdp_error(ss)));
197 exit(EXIT_FAILURE);
198 }
199
200 sdp_close(ss);
201
202 if (attr.flags != SDP_ATTR_OK
203 || attr.attr != SDP_ATTR_PROTOCOL_DESCRIPTOR_LIST) {
204 log_err("%s service not found", service_name);
205 exit(EXIT_FAILURE);
206 }
207
208 /*
209 * we expect the following protocol descriptor list
210 *
211 * seq len
212 * seq len
213 * uuid value == L2CAP
214 * uint16 value16 => PSM
215 * seq len
216 * uuid value == BNEP
217 */
218 if (_sdp_get_seq(&attr.value, attr.value + attr.vlen, &seq0)
219 && _sdp_get_seq(&seq0, attr.value, &seq1)
220 && _sdp_match_uuid16(&seq1, seq0, SDP_UUID_PROTOCOL_L2CAP)
221 && _sdp_get_uint16(&seq1, seq0, &l2cap_psm)
222 && _sdp_get_seq(&seq0, attr.value, &seq1)
223 && _sdp_match_uuid16(&seq1, seq0, SDP_UUID_PROTOCOL_BNEP)) {
224 log_info("Found PSM %d for service %s", l2cap_psm, service_name);
225 return;
226 }
227
228 log_err("%s query failed", service_name);
229 exit(EXIT_FAILURE);
230 }
231