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; strcasecmp(optarg, services[ul].name); ul++) {
147				if (ul == __arraycount(services))
148					errx(EXIT_FAILURE, "%s: unknown service", optarg);
149			}
150
151			if (ch == 's')
152				service_name = services[ul].name;
153
154			service_class = services[ul].class;
155			break;
156
157		default:
158			usage();
159			/* NOTREACHED */
160		}
161	}
162
163	argc -= optind;
164	argv += optind;
165
166	/* validate options */
167	if (bdaddr_any(&local_bdaddr) || service_class == 0)
168		usage();
169
170	if (!bdaddr_any(&remote_bdaddr) && (server_limit != 0 ||
171	    control_path != NULL || (service_name != NULL && l2cap_psm != 0)))
172		usage();
173
174	/* default options */
175	if (interface_name == NULL)
176		interface_name = "/dev/tap";
177
178	if (l2cap_psm == 0)
179		l2cap_psm = L2CAP_PSM_BNEP;
180
181	if (bdaddr_any(&remote_bdaddr) && server_limit == 0) {
182		if (service_class == SDP_SERVICE_CLASS_PANU)
183			server_limit = 1;
184		else
185			server_limit = 7;
186	}
187
188#ifdef L2CAP_LM_MASTER
189	if (server_limit > 1 && service_class != SDP_SERVICE_CLASS_PANU)
190		l2cap_mode |= L2CAP_LM_MASTER;
191#endif
192
193	/*
194	 * fork() now so that the setup can be done in the child process
195	 * (as kqueue is not inherited) but block in the parent until the
196	 * setup is finished so we can return an error if necessary.
197	 */
198	switch(fork()) {
199	case -1: /* bad */
200		err(EXIT_FAILURE, "fork() failed");
201
202	case 0:	/* child */
203		signal(SIGPIPE, SIG_IGN);
204
205		openlog(getprogname(), LOG_NDELAY | LOG_PERROR | LOG_PID, LOG_DAEMON);
206
207		channel_init();
208		server_init();
209		event_init();
210		client_init();
211		tap_init();
212
213		main_detach();
214
215		event_dispatch();
216		break;
217
218	default: /* parent */
219		signal(SIGUSR1, main_exit);
220		wait(&status);
221
222		if (WIFEXITED(status))
223			exit(WEXITSTATUS(status));
224
225		break;
226	}
227
228	err(EXIT_FAILURE, "exiting");
229}
230
231static void
232main_exit(int s)
233{
234
235	/* child is all grown up */
236	_exit(EXIT_SUCCESS);
237}
238
239static void
240main_detach(void)
241{
242	int fd;
243
244	if (kill(getppid(), SIGUSR1) == -1)
245		log_err("Could not signal main process: %m");
246
247	if (setsid() == -1)
248		log_err("setsid() failed");
249
250	fd = open(_PATH_DEVNULL, O_RDWR, 0);
251	if (fd == -1) {
252		log_err("Could not open %s", _PATH_DEVNULL);
253	} else {
254		(void)dup2(fd, STDIN_FILENO);
255		(void)dup2(fd, STDOUT_FILENO);
256		(void)dup2(fd, STDERR_FILENO);
257		close(fd);
258	}
259}
260
261static void
262usage(void)
263{
264	const char *p = getprogname();
265	int n = strlen(p);
266
267	fprintf(stderr,
268	    "usage: %s [-i ifname] [-m mode] -a address -d device\n"
269	    "       %*s {-s service | -S service [-p psm]}\n"
270	    "       %s [-c path] [-i ifname] [-l limit] [-m mode] [-p psm] -d device\n"
271	    "       %*s {-s service | -S service}\n"
272	    "\n"
273	    "Where:\n"
274	    "\t-a address  remote bluetooth device\n"
275	    "\t-c path     SDP server socket\n"
276	    "\t-d device   local bluetooth device\n"
277	    "\t-i ifname   tap interface\n"
278	    "\t-l limit    limit server sessions\n"
279	    "\t-m mode     L2CAP link mode (NOT YET SUPPORTED)\n"
280	    "\t-p psm      L2CAP PSM\n"
281	    "\t-S service  service name (no SDP)\n"
282	    "\t-s service  service name\n"
283	    "\n"
284	    "Known services:\n"
285	    "", p, n, "", p, n, "");
286
287	for (n = 0; n < __arraycount(services); n++)
288		fprintf(stderr, "\t%s\t%s\n", services[n].name, services[n].desc);
289
290	exit(EXIT_FAILURE);
291}
292