sdpd-server.c revision e0581b5e29c71c4a0b429ebad671e9bb5583f8e0 
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) 2002-2008  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
38#include <bluetooth/bluetooth.h>
39#include <bluetooth/l2cap.h>
40#include <bluetooth/sdp.h>
41#include <bluetooth/sdp_lib.h>
42
43#include <sys/un.h>
44#include <netinet/in.h>
45
46#include <glib.h>
47
48#include "logging.h"
49#include "sdpd.h"
50
51static GIOChannel *l2cap_io = NULL, *unix_io = NULL;
52
53static int l2cap_sock, unix_sock;
54
55/*
56 * SDP server initialization on startup includes creating the
57 * l2cap and unix sockets over which discovery and registration clients
58 * access us respectively
59 */
60static int init_server(uint16_t mtu, int master, int compat)
61{
62	struct l2cap_options opts;
63	struct sockaddr_l2 l2addr;
64	struct sockaddr_un unaddr;
65	socklen_t optlen;
66
67	/* Register the public browse group root */
68	register_public_browse_group();
69
70	/* Register the SDP server's service record */
71	register_server_service();
72
73	/* Create L2CAP socket */
74	l2cap_sock = socket(PF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP);
75	if (l2cap_sock < 0) {
76		error("opening L2CAP socket: %s", strerror(errno));
77		return -1;
78	}
79
80	memset(&l2addr, 0, sizeof(l2addr));
81	l2addr.l2_family = AF_BLUETOOTH;
82	bacpy(&l2addr.l2_bdaddr, BDADDR_ANY);
83	l2addr.l2_psm = htobs(SDP_PSM);
84
85	if (bind(l2cap_sock, (struct sockaddr *) &l2addr, sizeof(l2addr)) < 0) {
86		error("binding L2CAP socket: %s", strerror(errno));
87		return -1;
88	}
89
90	if (master) {
91		int opt = L2CAP_LM_MASTER;
92		if (setsockopt(l2cap_sock, SOL_L2CAP, L2CAP_LM, &opt, sizeof(opt)) < 0) {
93			error("setsockopt: %s", strerror(errno));
94			return -1;
95		}
96	}
97
98	if (mtu > 0) {
99		memset(&opts, 0, sizeof(opts));
100		optlen = sizeof(opts);
101
102		if (getsockopt(l2cap_sock, SOL_L2CAP, L2CAP_OPTIONS, &opts, &optlen) < 0) {
103			error("getsockopt: %s", strerror(errno));
104			return -1;
105		}
106
107		opts.omtu = mtu;
108		opts.imtu = mtu;
109
110		if (setsockopt(l2cap_sock, SOL_L2CAP, L2CAP_OPTIONS, &opts, sizeof(opts)) < 0) {
111			error("setsockopt: %s", strerror(errno));
112			return -1;
113		}
114	}
115
116	listen(l2cap_sock, 5);
117
118	if (!compat) {
119		unix_sock = -1;
120		return 0;
121	}
122
123	/* Create local Unix socket */
124	unix_sock = socket(PF_UNIX, SOCK_STREAM, 0);
125	if (unix_sock < 0) {
126		error("opening UNIX socket: %s", strerror(errno));
127		return -1;
128	}
129
130	memset(&unaddr, 0, sizeof(unaddr));
131	unaddr.sun_family = AF_UNIX;
132	strcpy(unaddr.sun_path, SDP_UNIX_PATH);
133
134	unlink(unaddr.sun_path);
135
136	if (bind(unix_sock, (struct sockaddr *) &unaddr, sizeof(unaddr)) < 0) {
137		error("binding UNIX socket: %s", strerror(errno));
138		return -1;
139	}
140
141	listen(unix_sock, 5);
142
143	chmod(SDP_UNIX_PATH, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
144
145	return 0;
146}
147
148static gboolean io_session_event(GIOChannel *chan, GIOCondition cond, gpointer data)
149{
150	sdp_pdu_hdr_t hdr;
151	uint8_t *buf;
152	int sk, len, size;
153
154	if (cond & G_IO_NVAL)
155		return FALSE;
156
157	sk = g_io_channel_unix_get_fd(chan);
158
159	if (cond & (G_IO_HUP | G_IO_ERR)) {
160		sdp_svcdb_collect_all(sk);
161		return FALSE;
162	}
163
164	len = recv(sk, &hdr, sizeof(sdp_pdu_hdr_t), MSG_PEEK);
165	if (len <= 0) {
166		sdp_svcdb_collect_all(sk);
167		return FALSE;
168	}
169
170	size = sizeof(sdp_pdu_hdr_t) + ntohs(hdr.plen);
171	buf = malloc(size);
172	if (!buf)
173		return TRUE;
174
175	len = recv(sk, buf, size, 0);
176	if (len <= 0) {
177		sdp_svcdb_collect_all(sk);
178		return FALSE;
179	}
180
181	handle_request(sk, buf, len);
182
183	return TRUE;
184}
185
186static gboolean io_accept_event(GIOChannel *chan, GIOCondition cond, gpointer data)
187{
188	GIOChannel *io;
189	int nsk;
190
191	if (cond & (G_IO_HUP | G_IO_ERR | G_IO_NVAL)) {
192		g_io_channel_unref(chan);
193		return FALSE;
194	}
195
196	if (data == &l2cap_sock) {
197		struct sockaddr_l2 addr;
198		socklen_t len = sizeof(addr);
199
200		nsk = accept(l2cap_sock, (struct sockaddr *) &addr, &len);
201	} else if (data == &unix_sock) {
202		struct sockaddr_un addr;
203		socklen_t len = sizeof(addr);
204
205		nsk = accept(unix_sock, (struct sockaddr *) &addr, &len);
206	} else
207		return FALSE;
208
209	if (nsk < 0) {
210		error("Can't accept connection: %s", strerror(errno));
211		return TRUE;
212	}
213
214	io = g_io_channel_unix_new(nsk);
215	g_io_channel_set_close_on_unref(io, TRUE);
216
217	g_io_add_watch(io, G_IO_IN | G_IO_ERR | G_IO_HUP | G_IO_NVAL,
218					io_session_event, data);
219
220	g_io_channel_unref(io);
221
222	return TRUE;
223}
224
225int start_sdp_server(uint16_t mtu, const char *did, uint32_t flags)
226{
227	int compat = flags & SDP_SERVER_COMPAT;
228	int master = flags & SDP_SERVER_MASTER;
229
230	info("Starting SDP server");
231
232	if (init_server(mtu, master, compat) < 0) {
233		error("Server initialization failed");
234		return -1;
235	}
236
237	if (did && strlen(did) > 0) {
238		const char *ptr = did;
239		uint16_t vid = 0x0000, pid = 0x0000, ver = 0x0000;
240
241		vid = (uint16_t) strtol(ptr, NULL, 16);
242		ptr = strchr(ptr, ':');
243		if (ptr) {
244			pid = (uint16_t) strtol(ptr + 1, NULL, 16);
245			ptr = strchr(ptr + 1, ':');
246			if (ptr)
247				ver = (uint16_t) strtol(ptr + 1, NULL, 16);
248			register_device_id(vid, pid, ver);
249		}
250	}
251
252	l2cap_io = g_io_channel_unix_new(l2cap_sock);
253	g_io_channel_set_close_on_unref(l2cap_io, TRUE);
254
255	g_io_add_watch(l2cap_io, G_IO_IN | G_IO_ERR | G_IO_HUP | G_IO_NVAL,
256					io_accept_event, &l2cap_sock);
257
258	if (compat && unix_sock > fileno(stderr)) {
259		unix_io = g_io_channel_unix_new(unix_sock);
260		g_io_channel_set_close_on_unref(unix_io, TRUE);
261
262		g_io_add_watch(unix_io, G_IO_IN | G_IO_ERR | G_IO_HUP | G_IO_NVAL,
263					io_accept_event, &unix_sock);
264	}
265
266	return 0;
267}
268
269void stop_sdp_server(void)
270{
271	info("Stopping SDP server");
272
273	sdp_svcdb_reset();
274
275	if (unix_io)
276		g_io_channel_unref(unix_io);
277
278	if (l2cap_io)
279		g_io_channel_unref(l2cap_io);
280}
281