1/*
2 * main.c
3 *
4 * Copyright (c) 2004 Maksim Yevmenkin <m_evmenkin@yahoo.com>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $Id: main.c,v 1.8 2004/01/13 19:31:54 max Exp $
29 * $FreeBSD$
30 */
31
32#include <sys/select.h>
33#include <bluetooth.h>
34#include <errno.h>
35#include <grp.h>
36#include <pwd.h>
37#include <signal.h>
38#include <sdp.h>
39#include <stdio.h>
40#include <stdlib.h>
41#include <string.h>
42#include <unistd.h>
43#include "log.h"
44#include "server.h"
45
46#include <netinet/in.h>
47#include <arpa/inet.h>
48#include <sys/queue.h>
49#include "profile.h"
50#include "provider.h"
51
52#define	SDPD			"sdpd"
53
54static int32_t 	drop_root	(char const *user, char const *group);
55static void	sighandler	(int32_t s);
56static void	usage		(void);
57
58static int32_t	done;
59
60/*
61 * Bluetooth Service Discovery Procotol (SDP) daemon
62 */
63
64int
65main(int argc, char *argv[])
66{
67	server_t		 server;
68	char const		*control = SDP_LOCAL_PATH;
69	char const		*user = "nobody", *group = "nobody";
70	int32_t			 detach = 1, opt;
71	struct sigaction	 sa;
72
73	while ((opt = getopt(argc, argv, "c:dg:hu:")) != -1) {
74		switch (opt) {
75		case 'c': /* control */
76			control = optarg;
77			break;
78
79		case 'd': /* do not detach */
80			detach = 0;
81			break;
82
83		case 'g': /* group */
84			group = optarg;
85			break;
86
87		case 'u': /* user */
88			user = optarg;
89			break;
90
91		case 'h':
92		default:
93			usage();
94			/* NOT REACHED */
95		}
96	}
97
98	log_open(SDPD, !detach);
99
100	/* Become daemon if required */
101	if (detach && daemon(0, 0) < 0) {
102		log_crit("Could not become daemon. %s (%d)",
103			strerror(errno), errno);
104		exit(1);
105	}
106
107	/* Set signal handlers */
108	memset(&sa, 0, sizeof(sa));
109	sa.sa_handler = sighandler;
110
111	if (sigaction(SIGTERM, &sa, NULL) < 0 ||
112	    sigaction(SIGHUP,  &sa, NULL) < 0 ||
113	    sigaction(SIGINT,  &sa, NULL) < 0) {
114		log_crit("Could not install signal handlers. %s (%d)",
115			strerror(errno), errno);
116		exit(1);
117	}
118
119	sa.sa_handler = SIG_IGN;
120	if (sigaction(SIGPIPE, &sa, NULL) < 0) {
121		log_crit("Could not install signal handlers. %s (%d)",
122			strerror(errno), errno);
123		exit(1);
124	}
125
126	/* Initialize server */
127	if (server_init(&server, control) < 0)
128		exit(1);
129
130	if ((user != NULL || group != NULL) && drop_root(user, group) < 0)
131		exit(1);
132
133	for (done = 0; !done; ) {
134		if (server_do(&server) != 0)
135			done ++;
136	}
137
138	server_shutdown(&server);
139	log_close();
140
141	return (0);
142}
143
144/*
145 * Drop root
146 */
147
148static int32_t
149drop_root(char const *user, char const *group)
150{
151	int	 uid, gid;
152	char	*ep;
153
154	if ((uid = getuid()) != 0) {
155		log_notice("Cannot set uid/gid. Not a superuser");
156		return (0); /* dont do anything unless root */
157	}
158
159	gid = getgid();
160
161	if (user != NULL) {
162		uid = strtol(user, &ep, 10);
163		if (*ep != '\0') {
164			struct passwd	*pwd = getpwnam(user);
165
166			if (pwd == NULL) {
167				log_err("Could not find passwd entry for " \
168					"user %s", user);
169				return (-1);
170			}
171
172			uid = pwd->pw_uid;
173		}
174	}
175
176	if (group != NULL) {
177		gid = strtol(group, &ep, 10);
178		if (*ep != '\0') {
179			struct group	*grp = getgrnam(group);
180
181			if (grp == NULL) {
182				log_err("Could not find group entry for " \
183					"group %s", group);
184				return (-1);
185			}
186
187			gid = grp->gr_gid;
188		}
189	}
190
191	if (setgid(gid) < 0) {
192		log_err("Could not setgid(%s). %s (%d)",
193			group, strerror(errno), errno);
194		return (-1);
195	}
196
197	if (setuid(uid) < 0) {
198		log_err("Could not setuid(%s). %s (%d)",
199			user, strerror(errno), errno);
200		return (-1);
201	}
202
203	return (0);
204}
205
206/*
207 * Signal handler
208 */
209
210static void
211sighandler(int32_t s)
212{
213	log_notice("Got signal %d. Total number of signals received %d",
214		s, ++ done);
215}
216
217/*
218 * Display usage information and quit
219 */
220
221static void
222usage(void)
223{
224	fprintf(stderr,
225"Usage: %s [options]\n" \
226"Where options are:\n" \
227"	-c	specify control socket name (default %s)\n" \
228"	-d	do not detach (run in foreground)\n" \
229"	-g grp	specify group\n" \
230"	-h	display usage and exit\n" \
231"	-u usr	specify user\n",
232		SDPD, SDP_LOCAL_PATH);
233	exit(255);
234}
235
236