1/*-
2 * main.c
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
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 */
32
33#include <sys/select.h>
34#define L2CAP_SOCKET_CHECKED
35#include <bluetooth.h>
36#include <errno.h>
37#include <grp.h>
38#include <pwd.h>
39#include <signal.h>
40#include <sdp.h>
41#include <stdio.h>
42#include <stdlib.h>
43#include <string.h>
44#include <unistd.h>
45#include "log.h"
46#include "server.h"
47
48#include <netinet/in.h>
49#include <arpa/inet.h>
50#include <sys/queue.h>
51#include "profile.h"
52#include "provider.h"
53
54#define	SDPD			"sdpd"
55
56static int32_t 	drop_root	(char const *user, char const *group);
57static void	sighandler	(int32_t s);
58static void	usage		(void);
59
60static int32_t	done;
61
62/*
63 * Bluetooth Service Discovery Procotol (SDP) daemon
64 */
65
66int
67main(int argc, char *argv[])
68{
69	server_t		 server;
70	char const		*control = SDP_LOCAL_PATH;
71	char const		*user = "nobody", *group = "nobody";
72	int32_t			 detach = 1, opt;
73	struct sigaction	 sa;
74
75	while ((opt = getopt(argc, argv, "c:dg:hu:")) != -1) {
76		switch (opt) {
77		case 'c': /* control */
78			control = optarg;
79			break;
80
81		case 'd': /* do not detach */
82			detach = 0;
83			break;
84
85		case 'g': /* group */
86			group = optarg;
87			break;
88
89		case 'u': /* user */
90			user = optarg;
91			break;
92
93		case 'h':
94		default:
95			usage();
96			/* NOT REACHED */
97		}
98	}
99
100	log_open(SDPD, !detach);
101
102	/* Become daemon if required */
103	if (detach && daemon(0, 0) < 0) {
104		log_crit("Could not become daemon. %s (%d)",
105			strerror(errno), errno);
106		exit(1);
107	}
108
109	/* Set signal handlers */
110	memset(&sa, 0, sizeof(sa));
111	sa.sa_handler = sighandler;
112
113	if (sigaction(SIGTERM, &sa, NULL) < 0 ||
114	    sigaction(SIGHUP,  &sa, NULL) < 0 ||
115	    sigaction(SIGINT,  &sa, NULL) < 0) {
116		log_crit("Could not install signal handlers. %s (%d)",
117			strerror(errno), errno);
118		exit(1);
119	}
120
121	sa.sa_handler = SIG_IGN;
122	if (sigaction(SIGPIPE, &sa, NULL) < 0) {
123		log_crit("Could not install signal handlers. %s (%d)",
124			strerror(errno), errno);
125		exit(1);
126	}
127
128	/* Initialize server */
129	if (server_init(&server, control) < 0)
130		exit(1);
131
132	if ((user != NULL || group != NULL) && drop_root(user, group) < 0)
133		exit(1);
134
135	for (done = 0; !done; ) {
136		if (server_do(&server) != 0)
137			done ++;
138	}
139
140	server_shutdown(&server);
141	log_close();
142
143	return (0);
144}
145
146/*
147 * Drop root
148 */
149
150static int32_t
151drop_root(char const *user, char const *group)
152{
153	int	 uid, gid;
154	char	*ep;
155
156	if ((uid = getuid()) != 0) {
157		log_notice("Cannot set uid/gid. Not a superuser");
158		return (0); /* dont do anything unless root */
159	}
160
161	gid = getgid();
162
163	if (user != NULL) {
164		uid = strtol(user, &ep, 10);
165		if (*ep != '\0') {
166			struct passwd	*pwd = getpwnam(user);
167
168			if (pwd == NULL) {
169				log_err("Could not find passwd entry for " \
170					"user %s", user);
171				return (-1);
172			}
173
174			uid = pwd->pw_uid;
175		}
176	}
177
178	if (group != NULL) {
179		gid = strtol(group, &ep, 10);
180		if (*ep != '\0') {
181			struct group	*grp = getgrnam(group);
182
183			if (grp == NULL) {
184				log_err("Could not find group entry for " \
185					"group %s", group);
186				return (-1);
187			}
188
189			gid = grp->gr_gid;
190		}
191	}
192
193	if (setgid(gid) < 0) {
194		log_err("Could not setgid(%s). %s (%d)",
195			group, strerror(errno), errno);
196		return (-1);
197	}
198
199	if (setuid(uid) < 0) {
200		log_err("Could not setuid(%s). %s (%d)",
201			user, strerror(errno), errno);
202		return (-1);
203	}
204
205	return (0);
206}
207
208/*
209 * Signal handler
210 */
211
212static void
213sighandler(int32_t s)
214{
215	log_notice("Got signal %d. Total number of signals received %d",
216		s, ++ done);
217}
218
219/*
220 * Display usage information and quit
221 */
222
223static void
224usage(void)
225{
226	fprintf(stderr,
227"Usage: %s [options]\n" \
228"Where options are:\n" \
229"	-c	specify control socket name (default %s)\n" \
230"	-d	do not detach (run in foreground)\n" \
231"	-g grp	specify group\n" \
232"	-h	display usage and exit\n" \
233"	-u usr	specify user\n",
234		SDPD, SDP_LOCAL_PATH);
235	exit(255);
236}
237
238