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
56 static int32_t drop_root (char const *user, char const *group);
57 static void sighandler (int32_t s);
58 static void usage (void);
59
60 static int32_t done;
61
62 /*
63 * Bluetooth Service Discovery Procotol (SDP) daemon
64 */
65
66 int
main(int argc,char * argv[])67 main(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
150 static int32_t
drop_root(char const * user,char const * group)151 drop_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
212 static void
sighandler(int32_t s)213 sighandler(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
223 static void
usage(void)224 usage(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