136 lines
2.5 KiB
C
136 lines
2.5 KiB
C
|
/* vi: set sw=4 ts=4: */
|
||
|
|
/* common.c
|
||
|
|
*
|
||
|
|
* Functions for debugging and logging as well as some other
|
||
|
|
* simple helper functions.
|
||
|
|
*
|
||
|
|
* Russ Dill <Russ.Dill@asu.edu> 2001-2003
|
||
|
|
* Rewritten by Vladimir Oleynik <dzo@simtreas.ru> (C) 2003
|
||
|
|
*
|
||
|
|
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#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;
|
||
|
|
|
||
|
|
long uptime(void)
|
||
|
|
{
|
||
|
|
struct sysinfo info;
|
||
|
|
sysinfo(&info);
|
||
|
|
return info.uptime;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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. */
|
||
|
|
pid_fd = pidfile_acquire(pidfile);
|
||
|
|
if (daemon(0, 0) == -1) { /* bb_xdaemon? */
|
||
|
|
perror("fork");
|
||
|
|
exit(1);
|
||
|
|
}
|
||
|
|
daemonized++;
|
||
|
|
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);
|
||
|
|
}
|
||
|
|
|
||
|
|
#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);
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
|
||
|
|
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);
|
||
|
|
|
||
|
|
#ifdef UDHCP_SYSLOG
|
||
|
|
openlog(client_server, LOG_PID | LOG_CONS, LOG_LOCAL0);
|
||
|
|
#endif
|
||
|
|
|
||
|
|
udhcp_logging(LOG_INFO, "%s (v%s) started", client_server, VERSION);
|
||
|
|
}
|