1 /*
2 * client.c
3 */
4
5 /*-
6 * SPDX-License-Identifier: BSD-2-Clause
7 *
8 * Copyright (c) 2006 Maksim Yevmenkin <m_evmenkin@yahoo.com>
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * $Id: client.c,v 1.7 2006/09/07 21:06:53 max Exp $
33 */
34
35 #include <sys/queue.h>
36 #include <assert.h>
37 #define L2CAP_SOCKET_CHECKED
38 #include <bluetooth.h>
39 #include <errno.h>
40 #include <fcntl.h>
41 #include <stdio.h>
42 #include <stdlib.h>
43 #include <string.h>
44 #include <syslog.h>
45 #include <unistd.h>
46 #include <usbhid.h>
47 #include "bthid_config.h"
48 #include "bthidd.h"
49
50 static int32_t client_socket(bdaddr_p bdaddr, uint16_t psm);
51
52 /*
53 * Get next config entry and create outbound connection (if required)
54 *
55 * XXX Do only one device at a time. At least one of my devices (3COM
56 * Bluetooth PCCARD) rejects Create_Connection command if another
57 * Create_Connection command is still pending. Weird...
58 */
59
60 static int32_t connect_in_progress = 0;
61
62 int32_t
client_rescan(bthid_server_p srv)63 client_rescan(bthid_server_p srv)
64 {
65 static hid_device_p d;
66 bthid_session_p s;
67
68 assert(srv != NULL);
69
70 if (connect_in_progress)
71 return (0); /* another connect is still pending */
72
73 d = get_next_hid_device(d);
74 if (d == NULL)
75 return (0); /* XXX should not happen? empty config? */
76
77 if ((s = session_by_bdaddr(srv, &d->bdaddr)) != NULL)
78 return (0); /* session already active */
79
80 if (!d->new_device) {
81 if (d->reconnect_initiate)
82 return (0); /* device will initiate reconnect */
83 }
84
85 syslog(LOG_NOTICE, "Opening outbound session for %s " \
86 "(new_device=%d, reconnect_initiate=%d)",
87 bt_ntoa(&d->bdaddr, NULL), d->new_device, d->reconnect_initiate);
88
89 if ((s = session_open(srv, d)) == NULL) {
90 syslog(LOG_CRIT, "Could not create outbound session for %s",
91 bt_ntoa(&d->bdaddr, NULL));
92 return (-1);
93 }
94
95 /* Open control channel */
96 s->ctrl = client_socket(&s->bdaddr, d->control_psm);
97 if (s->ctrl < 0) {
98 syslog(LOG_ERR, "Could not open control channel to %s. %s (%d)",
99 bt_ntoa(&s->bdaddr, NULL), strerror(errno), errno);
100 session_close(s);
101 return (-1);
102 }
103
104 s->state = W4CTRL;
105
106 FD_SET(s->ctrl, &srv->wfdset);
107 if (s->ctrl > srv->maxfd)
108 srv->maxfd = s->ctrl;
109
110 connect_in_progress = 1;
111
112 return (0);
113 }
114
115 /*
116 * Process connect on the socket
117 */
118
119 int32_t
client_connect(bthid_server_p srv,int32_t fd)120 client_connect(bthid_server_p srv, int32_t fd)
121 {
122 bthid_session_p s;
123 hid_device_p d;
124 int32_t error;
125 socklen_t len;
126
127 assert(srv != NULL);
128 assert(fd >= 0);
129
130 s = session_by_fd(srv, fd);
131 assert(s != NULL);
132
133 d = get_hid_device(&s->bdaddr);
134 assert(d != NULL);
135
136 error = 0;
137 len = sizeof(error);
138 if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &error, &len) < 0) {
139 syslog(LOG_ERR, "Could not get socket error for %s. %s (%d)",
140 bt_ntoa(&s->bdaddr, NULL), strerror(errno), errno);
141 session_close(s);
142 connect_in_progress = 0;
143
144 return (-1);
145 }
146
147 if (error != 0) {
148 syslog(LOG_ERR, "Could not connect to %s. %s (%d)",
149 bt_ntoa(&s->bdaddr, NULL), strerror(error), error);
150 session_close(s);
151 connect_in_progress = 0;
152
153 return (0);
154 }
155
156 switch (s->state) {
157 case W4CTRL: /* Control channel is open */
158 assert(s->ctrl == fd);
159 assert(s->intr == -1);
160
161 /* Open interrupt channel */
162 s->intr = client_socket(&s->bdaddr, d->interrupt_psm);
163 if (s->intr < 0) {
164 syslog(LOG_ERR, "Could not open interrupt channel " \
165 "to %s. %s (%d)", bt_ntoa(&s->bdaddr, NULL),
166 strerror(errno), errno);
167 session_close(s);
168 connect_in_progress = 0;
169
170 return (-1);
171 }
172
173 s->state = W4INTR;
174
175 FD_SET(s->intr, &srv->wfdset);
176 if (s->intr > srv->maxfd)
177 srv->maxfd = s->intr;
178
179 d->new_device = 0; /* reset new device flag */
180 write_hids_file();
181 break;
182
183 case W4INTR: /* Interrupt channel is open */
184 assert(s->ctrl != -1);
185 assert(s->intr == fd);
186
187 s->state = OPEN;
188 connect_in_progress = 0;
189
190 /* Create kbd/mouse after both channels are established */
191 if (session_run(s) < 0) {
192 session_close(s);
193 return (-1);
194 }
195 break;
196
197 default:
198 assert(0);
199 break;
200 }
201
202 /* Move fd to from the write fd set into read fd set */
203 FD_CLR(fd, &srv->wfdset);
204 FD_SET(fd, &srv->rfdset);
205
206 return (0);
207 }
208
209 /*
210 * Create bound non-blocking socket and initiate connect
211 */
212
213 static int
client_socket(bdaddr_p bdaddr,uint16_t psm)214 client_socket(bdaddr_p bdaddr, uint16_t psm)
215 {
216 struct sockaddr_l2cap l2addr;
217 int32_t s, m;
218
219 s = socket(PF_BLUETOOTH, SOCK_SEQPACKET, BLUETOOTH_PROTO_L2CAP);
220 if (s < 0)
221 return (-1);
222
223 m = fcntl(s, F_GETFL);
224 if (m < 0) {
225 close(s);
226 return (-1);
227 }
228
229 if (fcntl(s, F_SETFL, (m|O_NONBLOCK)) < 0) {
230 close(s);
231 return (-1);
232 }
233
234 l2addr.l2cap_len = sizeof(l2addr);
235 l2addr.l2cap_family = AF_BLUETOOTH;
236 memset(&l2addr.l2cap_bdaddr, 0, sizeof(l2addr.l2cap_bdaddr));
237 l2addr.l2cap_psm = 0;
238 l2addr.l2cap_bdaddr_type = BDADDR_BREDR;
239 l2addr.l2cap_cid = 0;
240
241 if (bind(s, (struct sockaddr *) &l2addr, sizeof(l2addr)) < 0) {
242 close(s);
243 return (-1);
244 }
245
246 memcpy(&l2addr.l2cap_bdaddr, bdaddr, sizeof(l2addr.l2cap_bdaddr));
247 l2addr.l2cap_psm = htole16(psm);
248
249 if (connect(s, (struct sockaddr *) &l2addr, sizeof(l2addr)) < 0 &&
250 errno != EINPROGRESS) {
251 close(s);
252 return (-1);
253 }
254
255 return (s);
256 }
257
258