1 /* $NetBSD: client.c,v 1.2 2008/12/06 20:01:14 plunky Exp $ */
2
3 /*-
4 * SPDX-License-Identifier: BSD-2-Clause
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
31 #include <sys/cdefs.h>
32 __RCSID("$NetBSD: client.c,v 1.2 2008/12/06 20:01:14 plunky Exp $");
33
34 #define L2CAP_SOCKET_CHECKED
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 #include "sdp.h"
43
44 static void client_query(void);
45
46 void
client_init(void)47 client_init(void)
48 {
49 struct sockaddr_l2cap sa;
50 channel_t *chan;
51 socklen_t len;
52 int fd, n;
53 uint16_t mru, mtu;
54
55 if (bdaddr_any(&remote_bdaddr))
56 return;
57
58 if (service_name)
59 client_query();
60
61 fd = socket(PF_BLUETOOTH, SOCK_SEQPACKET, BLUETOOTH_PROTO_L2CAP);
62 if (fd == -1) {
63 log_err("Could not open L2CAP socket: %m");
64 exit(EXIT_FAILURE);
65 }
66
67 memset(&sa, 0, sizeof(sa));
68 sa.l2cap_family = AF_BLUETOOTH;
69 sa.l2cap_len = sizeof(sa);
70 sa.l2cap_bdaddr_type = BDADDR_BREDR;
71 sa.l2cap_cid = 0;
72
73 bdaddr_copy(&sa.l2cap_bdaddr, &local_bdaddr);
74 if (bind(fd, (struct sockaddr *)&sa, sizeof(sa)) == -1) {
75 log_err("Could not bind client socket: %m");
76 exit(EXIT_FAILURE);
77 }
78
79 mru = BNEP_MTU_MIN;
80 if (setsockopt(fd, SOL_L2CAP, SO_L2CAP_IMTU, &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.l2cap_psm = htole16(l2cap_psm);
89 bdaddr_copy(&sa.l2cap_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, SOL_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 < (mru * 10)) {
111 n = mru * 10;
112 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &n, sizeof(n)) == -1)
113 log_info("Could not increase SO_RCVBUF (from %d)", n);
114 }
115
116 len = sizeof(mtu);
117 if (getsockopt(fd, SOL_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->mru = mru;
154 chan->mtu = mtu;
155 b2eaddr(chan->raddr, &remote_bdaddr);
156 b2eaddr(chan->laddr, &local_bdaddr);
157 chan->state = CHANNEL_WAIT_CONNECT_RSP;
158 channel_timeout(chan, 10);
159 if (!channel_open(chan, fd))
160 exit(EXIT_FAILURE);
161
162 bnep_send_control(chan, BNEP_SETUP_CONNECTION_REQUEST,
163 2, service_class, SDP_SERVICE_CLASS_PANU);
164 }
165
166 static void
client_query(void)167 client_query(void)
168 {
169 uint8_t buffer[512];
170 sdp_attr_t attr;
171 uint32_t range;
172 void *ss;
173 int rv;
174 uint8_t *seq0, *seq1;
175
176 attr.flags = SDP_ATTR_INVALID;
177 attr.attr = 0;
178 attr.vlen = sizeof(buffer);
179 attr.value = buffer;
180
181 range = SDP_ATTR_RANGE(SDP_ATTR_PROTOCOL_DESCRIPTOR_LIST,
182 SDP_ATTR_PROTOCOL_DESCRIPTOR_LIST);
183
184 ss = sdp_open(&local_bdaddr, &remote_bdaddr);
185 if (ss == NULL || (errno = sdp_error(ss)) != 0) {
186 log_err("%s: %m", service_name);
187 exit(EXIT_FAILURE);
188 }
189
190 log_info("Searching for %s service at %s",
191 service_name, bt_ntoa(&remote_bdaddr, NULL));
192
193 rv = sdp_search(ss, 1, &service_class, 1, &range, 1, &attr);
194 if (rv != 0) {
195 log_err("%s: %s", service_name, strerror(sdp_error(ss)));
196 exit(EXIT_FAILURE);
197 }
198
199 sdp_close(ss);
200
201 if (attr.flags != SDP_ATTR_OK
202 || attr.attr != SDP_ATTR_PROTOCOL_DESCRIPTOR_LIST) {
203 log_err("%s service not found", service_name);
204 exit(EXIT_FAILURE);
205 }
206
207 /*
208 * we expect the following protocol descriptor list
209 *
210 * seq len
211 * seq len
212 * uuid value == L2CAP
213 * uint16 value16 => PSM
214 * seq len
215 * uuid value == BNEP
216 */
217 if (_sdp_get_seq(&attr.value, attr.value + attr.vlen, &seq0)
218 && _sdp_get_seq(&seq0, attr.value, &seq1)
219 && _sdp_match_uuid16(&seq1, seq0, SDP_UUID_PROTOCOL_L2CAP)
220 && _sdp_get_uint16(&seq1, seq0, &l2cap_psm)
221 && _sdp_get_seq(&seq0, attr.value, &seq1)
222 && _sdp_match_uuid16(&seq1, seq0, SDP_UUID_PROTOCOL_BNEP)) {
223 log_info("Found PSM %d for service %s", l2cap_psm, service_name);
224 return;
225 }
226
227 log_err("%s query failed", service_name);
228 exit(EXIT_FAILURE);
229 }
230