1/*-
2 * main.c
3 *
4 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
5 *
6 * Copyright (c) 2004 Maksim Yevmenkin <m_evmenkin@yahoo.com>
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 AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 *
30 * $Id: main.c,v 1.8 2004/01/13 19:31:54 max Exp $
31 * $FreeBSD: stable/11/usr.sbin/bluetooth/sdpd/main.c 330449 2018-03-05 07:26:05Z eadler $
32 */
33
34#include <sys/select.h>
35#define L2CAP_SOCKET_CHECKED
36#include <bluetooth.h>
37#include <errno.h>
38#include <grp.h>
39#include <pwd.h>
40#include <signal.h>
41#include <sdp.h>
42#include <stdio.h>
43#include <stdlib.h>
44#include <string.h>
45#include <unistd.h>
46#include "log.h"
47#include "server.h"
48
49#include <netinet/in.h>
50#include <arpa/inet.h>
51#include <sys/queue.h>
52#include "profile.h"
53#include "provider.h"
54
55#define	SDPD			"sdpd"
56
57static int32_t 	drop_root	(char const *user, char const *group);
58static void	sighandler	(int32_t s);
59static void	usage		(void);
60
61static int32_t	done;
62
63/*
64 * Bluetooth Service Discovery Procotol (SDP) daemon
65 */
66
67int
68main(int argc, char *argv[])
69{
70	server_t		 server;
71	char const		*control = SDP_LOCAL_PATH;
72	char const		*user = "nobody", *group = "nobody";
73	int32_t			 detach = 1, opt;
74	struct sigaction	 sa;
75
76	while ((opt = getopt(argc, argv, "c:dg:hu:")) != -1) {
77		switch (opt) {
78		case 'c': /* control */
79			control = optarg;
80			break;
81
82		case 'd': /* do not detach */
83			detach = 0;
84			break;
85
86		case 'g': /* group */
87			group = optarg;
88			break;
89
90		case 'u': /* user */
91			user = optarg;
92			break;
93
94		case 'h':
95		default:
96			usage();
97			/* NOT REACHED */
98		}
99	}
100
101	log_open(SDPD, !detach);
102
103	/* Become daemon if required */
104	if (detach && daemon(0, 0) < 0) {
105		log_crit("Could not become daemon. %s (%d)",
106			strerror(errno), errno);
107		exit(1);
108	}
109
110	/* Set signal handlers */
111	memset(&sa, 0, sizeof(sa));
112	sa.sa_handler = sighandler;
113
114	if (sigaction(SIGTERM, &sa, NULL) < 0 ||
115	    sigaction(SIGHUP,  &sa, NULL) < 0 ||
116	    sigaction(SIGINT,  &sa, NULL) < 0) {
117		log_crit("Could not install signal handlers. %s (%d)",
118			strerror(errno), errno);
119		exit(1);
120	}
121
122	sa.sa_handler = SIG_IGN;
123	if (sigaction(SIGPIPE, &sa, NULL) < 0) {
124		log_crit("Could not install signal handlers. %s (%d)",
125			strerror(errno), errno);
126		exit(1);
127	}
128
129	/* Initialize server */
130	if (server_init(&server, control) < 0)
131		exit(1);
132
133	if ((user != NULL || group != NULL) && drop_root(user, group) < 0)
134		exit(1);
135
136	for (done = 0; !done; ) {
137		if (server_do(&server) != 0)
138			done ++;
139	}
140
141	server_shutdown(&server);
142	log_close();
143
144	return (0);
145}
146
147/*
148 * Drop root
149 */
150
151static int32_t
152drop_root(char const *user, char const *group)
153{
154	int	 uid, gid;
155	char	*ep;
156
157	if ((uid = getuid()) != 0) {
158		log_notice("Cannot set uid/gid. Not a superuser");
159		return (0); /* dont do anything unless root */
160	}
161
162	gid = getgid();
163
164	if (user != NULL) {
165		uid = strtol(user, &ep, 10);
166		if (*ep != '\0') {
167			struct passwd	*pwd = getpwnam(user);
168
169			if (pwd == NULL) {
170				log_err("Could not find passwd entry for " \
171					"user %s", user);
172				return (-1);
173			}
174
175			uid = pwd->pw_uid;
176		}
177	}
178
179	if (group != NULL) {
180		gid = strtol(group, &ep, 10);
181		if (*ep != '\0') {
182			struct group	*grp = getgrnam(group);
183
184			if (grp == NULL) {
185				log_err("Could not find group entry for " \
186					"group %s", group);
187				return (-1);
188			}
189
190			gid = grp->gr_gid;
191		}
192	}
193
194	if (setgid(gid) < 0) {
195		log_err("Could not setgid(%s). %s (%d)",
196			group, strerror(errno), errno);
197		return (-1);
198	}
199
200	if (setuid(uid) < 0) {
201		log_err("Could not setuid(%s). %s (%d)",
202			user, strerror(errno), errno);
203		return (-1);
204	}
205
206	return (0);
207}
208
209/*
210 * Signal handler
211 */
212
213static void
214sighandler(int32_t s)
215{
216	log_notice("Got signal %d. Total number of signals received %d",
217		s, ++ done);
218}
219
220/*
221 * Display usage information and quit
222 */
223
224static void
225usage(void)
226{
227	fprintf(stderr,
228"Usage: %s [options]\n" \
229"Where options are:\n" \
230"	-c	specify control socket name (default %s)\n" \
231"	-d	do not detach (run in foreground)\n" \
232"	-g grp	specify group\n" \
233"	-h	display usage and exit\n" \
234"	-u usr	specify user\n",
235		SDPD, SDP_LOCAL_PATH);
236	exit(255);
237}
238
239