1 /*
2 *
3 * BlueZ - Bluetooth protocol stack for Linux
4 *
5 * Copyright (C) 2004-2010 Marcel Holtmann <marcel@holtmann.org>
6 *
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21 *
22 */
23
24 #ifdef HAVE_CONFIG_H
25 #include <config.h>
26 #endif
27
28 #include <stdio.h>
29 #include <errno.h>
30 #include <unistd.h>
31 #include <stdlib.h>
32 #include <string.h>
33 #include <signal.h>
34 #include <sys/stat.h>
35 #include <syslog.h>
36
37 #include <glib.h>
38
39 #ifdef HAVE_CAPNG
40 #include <cap-ng.h>
41 #endif
42
43 static GMainLoop *event_loop;
44
sig_term(int sig)45 static void sig_term(int sig)
46 {
47 g_main_loop_quit(event_loop);
48 }
49
50 static gboolean option_detach = TRUE;
51 static gboolean option_debug = FALSE;
52
53 static GOptionEntry options[] = {
54 { "nodaemon", 'n', G_OPTION_FLAG_REVERSE,
55 G_OPTION_ARG_NONE, &option_detach,
56 "Don't run as daemon in background" },
57 { "debug", 'd', 0, G_OPTION_ARG_NONE, &option_debug,
58 "Enable debug information output" },
59 { NULL },
60 };
61
debug(const char * format,...)62 static void debug(const char *format, ...)
63 {
64 va_list ap;
65
66 if (!option_debug)
67 return;
68
69 va_start(ap, format);
70
71 vsyslog(LOG_DEBUG, format, ap);
72
73 va_end(ap);
74 }
75
sig_debug(int sig)76 static void sig_debug(int sig)
77 {
78 option_debug = !option_debug;
79 }
80
main(int argc,char * argv[])81 int main(int argc, char *argv[])
82 {
83 GOptionContext *context;
84 GError *err = NULL;
85 struct sigaction sa;
86
87 #ifdef HAVE_CAPNG
88 /* Drop capabilities */
89 capng_clear(CAPNG_SELECT_BOTH);
90 capng_updatev(CAPNG_ADD, CAPNG_EFFECTIVE | CAPNG_PERMITTED,
91 CAP_NET_BIND_SERVICE, CAP_NET_ADMIN,
92 CAP_NET_RAW, CAP_IPC_LOCK, -1);
93 capng_apply(CAPNG_SELECT_BOTH);
94 #endif
95
96 context = g_option_context_new(NULL);
97 g_option_context_add_main_entries(context, options, NULL);
98
99 if (g_option_context_parse(context, &argc, &argv, &err) == FALSE) {
100 if (err != NULL) {
101 g_printerr("%s\n", err->message);
102 g_error_free(err);
103 } else
104 g_printerr("An unknown error occurred\n");
105 exit(1);
106 }
107
108 g_option_context_free(context);
109
110 if (option_detach == TRUE) {
111 if (daemon(0, 0)) {
112 perror("Can't start daemon");
113 exit(1);
114 }
115 }
116
117 umask(0077);
118
119 openlog("hcitrace", LOG_PID | LOG_NDELAY | LOG_PERROR, LOG_DAEMON);
120
121 syslog(LOG_INFO, "HCI trace deamon %s", VERSION);
122
123 memset(&sa, 0, sizeof(sa));
124 sa.sa_flags = SA_NOCLDSTOP;
125 sa.sa_handler = sig_term;
126 sigaction(SIGTERM, &sa, NULL);
127 sigaction(SIGINT, &sa, NULL);
128
129 sa.sa_handler = sig_debug;
130 sigaction(SIGUSR2, &sa, NULL);
131
132 sa.sa_handler = SIG_IGN;
133 sigaction(SIGPIPE, &sa, NULL);
134
135 if (option_debug == TRUE) {
136 syslog(LOG_INFO, "Enabling debug information");
137 }
138
139 event_loop = g_main_loop_new(NULL, FALSE);
140
141 debug("Entering main loop");
142
143 g_main_loop_run(event_loop);
144
145 g_main_loop_unref(event_loop);
146
147 syslog(LOG_INFO, "Exit");
148
149 closelog();
150
151 return 0;
152 }
153