1 /*-
2 * main.c
3 *
4 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
5 *
6 * Copyright (c) 2004 Maksim Yevmenkin <[email protected]>
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 * $FreeBSD$
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
57 static int32_t drop_root (char const *user, char const *group);
58 static void sighandler (int32_t s);
59 static void usage (void);
60
61 static int32_t done;
62
63 /*
64 * Bluetooth Service Discovery Procotol (SDP) daemon
65 */
66
67 int
main(int argc,char * argv[])68 main(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
151 static int32_t
drop_root(char const * user,char const * group)152 drop_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
213 static void
sighandler(int32_t s)214 sighandler(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
224 static void
usage(void)225 usage(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