1/*	$NetBSD: btpand.c,v 1.1 2008/08/17 13:20:57 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/wait.h>
32
33#define L2CAP_SOCKET_CHECKED
34#include <bluetooth.h>
35#include <err.h>
36#include <fcntl.h>
37#include <paths.h>
38#include <sdp.h>
39#include <stdio.h>
40#include <signal.h>
41#include <stdlib.h>
42#include <string.h>
43#include <unistd.h>
44
45#include "btpand.h"
46
47/* global variables */
48const char *	control_path;		/* -c <path> */
49const char *	interface_name;		/* -i <ifname> */
50const char *	service_name;		/* -s <service> */
51uint16_t	service_class;
52
53bdaddr_t	local_bdaddr;		/* -d <addr> */
54bdaddr_t	remote_bdaddr;		/* -a <addr> */
55uint16_t	l2cap_psm;		/* -p <psm> */
56int		l2cap_mode;		/* -m <mode> */
57
58int		server_limit;		/* -n <limit> */
59
60static const struct {
61	const char *	name;
62	uint16_t	class;
63	const char *	desc;
64} services[] = {
65	{ "PANU", SDP_SERVICE_CLASS_PANU, "Personal Area Networking User" },
66	{ "NAP",  SDP_SERVICE_CLASS_NAP,  "Network Access Point"		  },
67	{ "GN",	  SDP_SERVICE_CLASS_GN,   "Group Network"		  },
68};
69
70static void main_exit(int) __dead2;
71static void main_detach(void);
72static void usage(void) __dead2;
73
74int
75main(int argc, char *argv[])
76{
77	unsigned long	ul;
78	char *		ep;
79	int		ch, status;
80
81	while ((ch = getopt(argc, argv, "a:c:d:i:l:m:p:S:s:")) != -1) {
82		switch (ch) {
83		case 'a': /* remote address */
84			if (!bt_aton(optarg, &remote_bdaddr)) {
85				struct hostent  *he;
86
87				if ((he = bt_gethostbyname(optarg)) == NULL)
88					errx(EXIT_FAILURE, "%s: %s",
89					    optarg, hstrerror(h_errno));
90
91				bdaddr_copy(&remote_bdaddr,
92					(bdaddr_t *)he->h_addr);
93			}
94
95			break;
96
97		case 'c': /* control socket path */
98			control_path = optarg;
99			break;
100
101		case 'd': /* local address */
102			if (!bt_devaddr(optarg, &local_bdaddr)) {
103				struct hostent  *he;
104
105				if ((he = bt_gethostbyname(optarg)) == NULL)
106					errx(EXIT_FAILURE, "%s: %s",
107					    optarg, hstrerror(h_errno));
108
109				bdaddr_copy(&local_bdaddr,
110					(bdaddr_t *)he->h_addr);
111			}
112			break;
113
114		case 'i': /* tap interface name */
115			if (strchr(optarg, '/') == NULL) {
116				asprintf(&ep, "/dev/%s", optarg);
117				interface_name = ep;
118			} else
119				interface_name = optarg;
120			break;
121
122		case 'l': /* limit server sessions */
123			ul = strtoul(optarg, &ep, 10);
124			if (*optarg == '\0' || *ep != '\0' || ul == 0)
125				errx(EXIT_FAILURE, "%s: invalid session limit",
126					optarg);
127
128			server_limit = ul;
129			break;
130
131		case 'm': /* link mode */
132			warnx("Setting link mode is not yet supported");
133			break;
134
135		case 'p': /* protocol/service multiplexer */
136			ul = strtoul(optarg, &ep, 0);
137			if (*optarg == '\0' || *ep != '\0'
138			    || ul > 0xffff || L2CAP_PSM_INVALID(ul))
139				errx(EXIT_FAILURE, "%s: invalid PSM", optarg);
140
141			l2cap_psm = ul;
142			break;
143
144		case 's': /* service */
145		case 'S': /* service (no SDP) */
146			for (ul = 0; ul < __arraycount(services); ul++) {
147				if (strcasecmp(optarg, services[ul].name) == 0)
148					break;
149			}
150
151			if (ul == __arraycount(services))
152				errx(EXIT_FAILURE, "%s: unknown service", optarg);
153
154			if (ch == 's')
155				service_name = services[ul].name;
156
157			service_class = services[ul].class;
158			break;
159
160		default:
161			usage();
162			/* NOTREACHED */
163		}
164	}
165
166	argc -= optind;
167	argv += optind;
168
169	/* validate options */
170	if (bdaddr_any(&local_bdaddr) || service_class == 0)
171		usage();
172
173	if (!bdaddr_any(&remote_bdaddr) && (server_limit != 0 ||
174	    control_path != NULL || (service_name != NULL && l2cap_psm != 0)))
175		usage();
176
177	/* default options */
178	if (interface_name == NULL)
179		interface_name = "/dev/tap";
180
181	if (l2cap_psm == 0)
182		l2cap_psm = L2CAP_PSM_BNEP;
183
184	if (bdaddr_any(&remote_bdaddr) && server_limit == 0) {
185		if (service_class == SDP_SERVICE_CLASS_PANU)
186			server_limit = 1;
187		else
188			server_limit = 7;
189	}
190
191#ifdef L2CAP_LM_MASTER
192	if (server_limit > 1 && service_class != SDP_SERVICE_CLASS_PANU)
193		l2cap_mode |= L2CAP_LM_MASTER;
194#endif
195
196	/*
197	 * fork() now so that the setup can be done in the child process
198	 * (as kqueue is not inherited) but block in the parent until the
199	 * setup is finished so we can return an error if necessary.
200	 */
201	switch(fork()) {
202	case -1: /* bad */
203		err(EXIT_FAILURE, "fork() failed");
204
205	case 0:	/* child */
206		signal(SIGPIPE, SIG_IGN);
207
208		openlog(getprogname(), LOG_NDELAY | LOG_PERROR | LOG_PID, LOG_DAEMON);
209
210		channel_init();
211		server_init();
212		event_init();
213		client_init();
214		tap_init();
215
216		main_detach();
217
218		event_dispatch();
219		break;
220
221	default: /* parent */
222		signal(SIGUSR1, main_exit);
223		wait(&status);
224
225		if (WIFEXITED(status))
226			exit(WEXITSTATUS(status));
227
228		break;
229	}
230
231	err(EXIT_FAILURE, "exiting");
232}
233
234static void
235main_exit(int s)
236{
237
238	/* child is all grown up */
239	_exit(EXIT_SUCCESS);
240}
241
242static void
243main_detach(void)
244{
245	int fd;
246
247	if (kill(getppid(), SIGUSR1) == -1)
248		log_err("Could not signal main process: %m");
249
250	if (setsid() == -1)
251		log_err("setsid() failed");
252
253	fd = open(_PATH_DEVNULL, O_RDWR, 0);
254	if (fd == -1) {
255		log_err("Could not open %s", _PATH_DEVNULL);
256	} else {
257		(void)dup2(fd, STDIN_FILENO);
258		(void)dup2(fd, STDOUT_FILENO);
259		(void)dup2(fd, STDERR_FILENO);
260		close(fd);
261	}
262}
263
264static void
265usage(void)
266{
267	const char *p = getprogname();
268	int n = strlen(p);
269
270	fprintf(stderr,
271	    "usage: %s [-i ifname] [-m mode] -a address -d device\n"
272	    "       %*s {-s service | -S service [-p psm]}\n"
273	    "       %s [-c path] [-i ifname] [-l limit] [-m mode] [-p psm] -d device\n"
274	    "       %*s {-s service | -S service}\n"
275	    "\n"
276	    "Where:\n"
277	    "\t-a address  remote bluetooth device\n"
278	    "\t-c path     SDP server socket\n"
279	    "\t-d device   local bluetooth device\n"
280	    "\t-i ifname   tap interface\n"
281	    "\t-l limit    limit server sessions\n"
282	    "\t-m mode     L2CAP link mode (NOT YET SUPPORTED)\n"
283	    "\t-p psm      L2CAP PSM\n"
284	    "\t-S service  service name (no SDP)\n"
285	    "\t-s service  service name\n"
286	    "\n"
287	    "Known services:\n"
288	    "", p, n, "", p, n, "");
289
290	for (n = 0; n < __arraycount(services); n++)
291		fprintf(stderr, "\t%s\t%s\n", services[n].name, services[n].desc);
292
293	exit(EXIT_FAILURE);
294}
295