aboutsummaryrefslogtreecommitdiff
path: root/networking/udhcp/common.c
blob: 5dad7d51c3755fd7dba2a886c055d0fbf7887d3f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
/* common.c
 *
 * Functions for debugging and logging as well as some other
 * simple helper functions.
 *
 * Russ Dill <Russ.Dill@asu.edu> 2001-2003
 * Rewrited by Vladimir Oleynik <dzo@simtreas.ru> (C) 2003
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <signal.h>
#include <paths.h>
#include <sys/socket.h>
#include <stdarg.h>

#include "common.h"
#include "pidfile.h"


static int daemonized;


/*
 * This function makes sure our first socket calls
 * aren't going to fd 1 (printf badness...) and are
 * not later closed by daemon()
 */
static inline void sanitize_fds(void)
{
	int zero;
	if ((zero = open(_PATH_DEVNULL, O_RDWR, 0)) < 0) return;
	while (zero < 3) zero = dup(zero);
	close(zero);
}


void background(const char *pidfile)
{
#ifdef __uClinux__
	LOG(LOG_ERR, "Cannot background in uclinux (yet)");
#else /* __uClinux__ */
	int pid_fd;

	/* hold lock during fork. */
	if (pidfile) pid_fd = pidfile_acquire(pidfile);
	if (daemon(0, 0) == -1) {
		perror("fork");
		exit(1);
	}
	daemonized++;
	if (pidfile) pidfile_write_release(pid_fd);
#endif /* __uClinux__ */
}


#ifdef UDHCP_SYSLOG
void udhcp_logging(int level, const char *fmt, ...)
{
	va_list p;
	va_list p2;

	va_start(p, fmt);
	__va_copy(p2, p);
	if(!daemonized) {
		vprintf(fmt, p);
		putchar('\n');
	}
	vsyslog(level, fmt, p2);
	va_end(p);
}


void start_log_and_pid(const char *client_server, const char *pidfile)
{
	int pid_fd;

	/* Make sure our syslog fd isn't overwritten */
	sanitize_fds();

	/* do some other misc startup stuff while we are here to save bytes */
	if (pidfile) {
		pid_fd = pidfile_acquire(pidfile);
		pidfile_write_release(pid_fd);
	}

	/* equivelent of doing a fflush after every \n */
	setlinebuf(stdout);

	openlog(client_server, LOG_PID | LOG_CONS, LOG_LOCAL0);
	udhcp_logging(LOG_INFO, "%s (v%s) started", client_server, VERSION);
}


#else


static char *syslog_level_msg[] = {
	[LOG_EMERG]   = "EMERGENCY!",
	[LOG_ALERT]   = "ALERT!",
	[LOG_CRIT]    = "critical!",
	[LOG_WARNING] = "warning",
	[LOG_ERR]     = "error",
	[LOG_INFO]    = "info",
	[LOG_DEBUG]   = "debug"
};


void udhcp_logging(int level, const char *fmt, ...)
{
	va_list p;

	va_start(p, fmt);
	if(!daemonized) {
		printf("%s, ", syslog_level_msg[level]);
		vprintf(fmt, p);
		putchar('\n');
	}
	va_end(p);
}


void start_log_and_pid(const char *client_server, const char *pidfile)
{
	int pid_fd;

	/* Make sure our syslog fd isn't overwritten */
	sanitize_fds();

	/* do some other misc startup stuff while we are here to save bytes */
	pid_fd = pidfile_acquire(pidfile);
	pidfile_write_release(pid_fd);

	/* equivelent of doing a fflush after every \n */
	setlinebuf(stdout);

	udhcp_logging(LOG_INFO, "%s (v%s) started", client_server, VERSION);
}
#endif