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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