1 /*
2 *
3 * BlueZ - Bluetooth protocol stack for Linux
4 *
5 * Copyright (C) 2001-2002 Nokia Corporation
6 * Copyright (C) 2002-2003 Maxim Krasnyansky <maxk@qualcomm.com>
7 * Copyright (C) 2002-2009 Marcel Holtmann <marcel@holtmann.org>
8 * Copyright (C) 2002-2003 Stephen Crane <steve.crane@rococosoft.com>
9 *
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
24 *
25 */
26
27 #ifdef HAVE_CONFIG_H
28 #include <config.h>
29 #endif
30
31 #include <stdio.h>
32 #include <errno.h>
33 #include <unistd.h>
34 #include <stdlib.h>
35 #include <sys/stat.h>
36 #include <sys/socket.h>
37 #include <cutils/sockets.h>
38
39 #include <bluetooth/bluetooth.h>
40 #include <bluetooth/l2cap.h>
41 #include <bluetooth/sdp.h>
42 #include <bluetooth/sdp_lib.h>
43
44 #include <sys/un.h>
45 #include <netinet/in.h>
46
47 #include <glib.h>
48
49 #include "logging.h"
50 #include "sdpd.h"
51
52 static GIOChannel *l2cap_io = NULL, *unix_io = NULL;
53
54 static int l2cap_sock, unix_sock;
55
56 /*
57 * SDP server initialization on startup includes creating the
58 * l2cap and unix sockets over which discovery and registration clients
59 * access us respectively
60 */
init_server(uint16_t mtu,int master,int compat)61 static int init_server(uint16_t mtu, int master, int compat)
62 {
63 struct l2cap_options opts;
64 struct sockaddr_l2 l2addr;
65 struct sockaddr_un unaddr;
66 socklen_t optlen;
67
68 /* Register the public browse group root */
69 register_public_browse_group();
70
71 /* Register the SDP server's service record */
72 register_server_service();
73
74 /* Create L2CAP socket */
75 l2cap_sock = socket(PF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP);
76 if (l2cap_sock < 0) {
77 error("opening L2CAP socket: %s", strerror(errno));
78 return -1;
79 }
80
81 memset(&l2addr, 0, sizeof(l2addr));
82 l2addr.l2_family = AF_BLUETOOTH;
83 bacpy(&l2addr.l2_bdaddr, BDADDR_ANY);
84 l2addr.l2_psm = htobs(SDP_PSM);
85
86 if (bind(l2cap_sock, (struct sockaddr *) &l2addr, sizeof(l2addr)) < 0) {
87 error("binding L2CAP socket: %s", strerror(errno));
88 return -1;
89 }
90
91 if (master) {
92 int opt = L2CAP_LM_MASTER;
93 if (setsockopt(l2cap_sock, SOL_L2CAP, L2CAP_LM, &opt, sizeof(opt)) < 0) {
94 error("setsockopt: %s", strerror(errno));
95 return -1;
96 }
97 }
98
99 if (mtu > 0) {
100 memset(&opts, 0, sizeof(opts));
101 optlen = sizeof(opts);
102
103 if (getsockopt(l2cap_sock, SOL_L2CAP, L2CAP_OPTIONS, &opts, &optlen) < 0) {
104 error("getsockopt: %s", strerror(errno));
105 return -1;
106 }
107
108 opts.omtu = mtu;
109 opts.imtu = mtu;
110
111 if (setsockopt(l2cap_sock, SOL_L2CAP, L2CAP_OPTIONS, &opts, sizeof(opts)) < 0) {
112 error("setsockopt: %s", strerror(errno));
113 return -1;
114 }
115 }
116
117 listen(l2cap_sock, 5);
118
119 if (!compat) {
120 unix_sock = -1;
121 return 0;
122 }
123 #if 0
124 /* Create local Unix socket */
125 unix_sock = socket(PF_UNIX, SOCK_STREAM, 0);
126 if (unix_sock < 0) {
127 error("opening UNIX socket: %s", strerror(errno));
128 return -1;
129 }
130
131 memset(&unaddr, 0, sizeof(unaddr));
132 unaddr.sun_family = AF_UNIX;
133 strcpy(unaddr.sun_path, SDP_UNIX_PATH);
134
135 unlink(unaddr.sun_path);
136
137 if (bind(unix_sock, (struct sockaddr *) &unaddr, sizeof(unaddr)) < 0) {
138 error("binding UNIX socket: %s", strerror(errno));
139 return -1;
140 }
141
142 listen(unix_sock, 5);
143
144 chmod(SDP_UNIX_PATH, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
145 #else
146 unix_sock = android_get_control_socket("bluetooth");
147 if (unix_sock < 0) {
148 error("Unable to get the control socket for 'bluetooth'");
149 return -1;
150 }
151
152 if (listen(unix_sock, 5)) {
153 error("Listening on local socket failed: %s", strerror(errno));
154 return -1;
155 }
156
157 info("Got Unix socket fd '%d' from environment", unix_sock);
158 #endif
159
160 return 0;
161 }
162
io_session_event(GIOChannel * chan,GIOCondition cond,gpointer data)163 static gboolean io_session_event(GIOChannel *chan, GIOCondition cond, gpointer data)
164 {
165 sdp_pdu_hdr_t hdr;
166 uint8_t *buf;
167 int sk, len, size;
168
169 if (cond & G_IO_NVAL)
170 return FALSE;
171
172 sk = g_io_channel_unix_get_fd(chan);
173
174 if (cond & (G_IO_HUP | G_IO_ERR)) {
175 sdp_svcdb_collect_all(sk);
176 return FALSE;
177 }
178
179 len = recv(sk, &hdr, sizeof(sdp_pdu_hdr_t), MSG_PEEK);
180 if (len <= 0) {
181 sdp_svcdb_collect_all(sk);
182 return FALSE;
183 }
184
185 size = sizeof(sdp_pdu_hdr_t) + ntohs(hdr.plen);
186 buf = malloc(size);
187 if (!buf)
188 return TRUE;
189
190 len = recv(sk, buf, size, 0);
191 if (len <= 0) {
192 sdp_svcdb_collect_all(sk);
193 free(buf);
194 return FALSE;
195 }
196
197 handle_request(sk, buf, len);
198
199 return TRUE;
200 }
201
io_accept_event(GIOChannel * chan,GIOCondition cond,gpointer data)202 static gboolean io_accept_event(GIOChannel *chan, GIOCondition cond, gpointer data)
203 {
204 GIOChannel *io;
205 int nsk;
206
207 if (cond & (G_IO_HUP | G_IO_ERR | G_IO_NVAL)) {
208 g_io_channel_unref(chan);
209 return FALSE;
210 }
211
212 if (data == &l2cap_sock) {
213 struct sockaddr_l2 addr;
214 socklen_t len = sizeof(addr);
215
216 nsk = accept(l2cap_sock, (struct sockaddr *) &addr, &len);
217 } else if (data == &unix_sock) {
218 struct sockaddr_un addr;
219 socklen_t len = sizeof(addr);
220
221 nsk = accept(unix_sock, (struct sockaddr *) &addr, &len);
222 } else
223 return FALSE;
224
225 if (nsk < 0) {
226 error("Can't accept connection: %s", strerror(errno));
227 return TRUE;
228 }
229
230 io = g_io_channel_unix_new(nsk);
231 g_io_channel_set_close_on_unref(io, TRUE);
232
233 g_io_add_watch(io, G_IO_IN | G_IO_ERR | G_IO_HUP | G_IO_NVAL,
234 io_session_event, data);
235
236 g_io_channel_unref(io);
237
238 return TRUE;
239 }
240
start_sdp_server(uint16_t mtu,const char * did,uint32_t flags)241 int start_sdp_server(uint16_t mtu, const char *did, uint32_t flags)
242 {
243 int compat = flags & SDP_SERVER_COMPAT;
244 int master = flags & SDP_SERVER_MASTER;
245
246 info("Starting SDP server");
247
248 if (init_server(mtu, master, compat) < 0) {
249 error("Server initialization failed");
250 return -1;
251 }
252
253 if (did && strlen(did) > 0) {
254 const char *ptr = did;
255 uint16_t vid = 0x0000, pid = 0x0000, ver = 0x0000;
256
257 vid = (uint16_t) strtol(ptr, NULL, 16);
258 ptr = strchr(ptr, ':');
259 if (ptr) {
260 pid = (uint16_t) strtol(ptr + 1, NULL, 16);
261 ptr = strchr(ptr + 1, ':');
262 if (ptr)
263 ver = (uint16_t) strtol(ptr + 1, NULL, 16);
264 register_device_id(vid, pid, ver);
265 }
266 }
267
268 l2cap_io = g_io_channel_unix_new(l2cap_sock);
269 g_io_channel_set_close_on_unref(l2cap_io, TRUE);
270
271 g_io_add_watch(l2cap_io, G_IO_IN | G_IO_ERR | G_IO_HUP | G_IO_NVAL,
272 io_accept_event, &l2cap_sock);
273
274 if (compat && unix_sock > fileno(stderr)) {
275 unix_io = g_io_channel_unix_new(unix_sock);
276 g_io_channel_set_close_on_unref(unix_io, TRUE);
277
278 g_io_add_watch(unix_io, G_IO_IN | G_IO_ERR | G_IO_HUP | G_IO_NVAL,
279 io_accept_event, &unix_sock);
280 }
281
282 return 0;
283 }
284
stop_sdp_server(void)285 void stop_sdp_server(void)
286 {
287 info("Stopping SDP server");
288
289 sdp_svcdb_reset();
290
291 if (unix_io)
292 g_io_channel_unref(unix_io);
293
294 if (l2cap_io)
295 g_io_channel_unref(l2cap_io);
296 }
297