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https://github.com/sheumann/hush.git
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163 lines
3.4 KiB
C
163 lines
3.4 KiB
C
/* common.c
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*
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* Functions for debugging and logging as well as some other
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* simple helper functions.
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*
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* Russ Dill <Russ.Dill@asu.edu> 2001-2003
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* Rewritten by Vladimir Oleynik <dzo@simtreas.ru> (C) 2003
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <paths.h>
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#include <sys/socket.h>
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#include <stdarg.h>
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#include "common.h"
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#include "pidfile.h"
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static int daemonized;
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long uptime(void)
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{
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struct sysinfo info;
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sysinfo(&info);
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return info.uptime;
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}
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/*
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* This function makes sure our first socket calls
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* aren't going to fd 1 (printf badness...) and are
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* not later closed by daemon()
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*/
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static inline void sanitize_fds(void)
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{
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int zero;
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if ((zero = open(_PATH_DEVNULL, O_RDWR, 0)) < 0) return;
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while (zero < 3) zero = dup(zero);
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close(zero);
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}
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void background(const char *pidfile)
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{
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#ifdef __uClinux__
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LOG(LOG_ERR, "Cannot background in uclinux (yet)");
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#else /* __uClinux__ */
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int pid_fd;
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/* hold lock during fork. */
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pid_fd = pidfile_acquire(pidfile);
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if (daemon(0, 0) == -1) {
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perror("fork");
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exit(1);
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}
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daemonized++;
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pidfile_write_release(pid_fd);
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#endif /* __uClinux__ */
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}
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#ifdef UDHCP_SYSLOG
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void udhcp_logging(int level, const char *fmt, ...)
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{
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va_list p;
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va_list p2;
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va_start(p, fmt);
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__va_copy(p2, p);
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if(!daemonized) {
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vprintf(fmt, p);
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putchar('\n');
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}
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vsyslog(level, fmt, p2);
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va_end(p);
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}
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void start_log_and_pid(const char *client_server, const char *pidfile)
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{
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int pid_fd;
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/* Make sure our syslog fd isn't overwritten */
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sanitize_fds();
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/* do some other misc startup stuff while we are here to save bytes */
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pid_fd = pidfile_acquire(pidfile);
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pidfile_write_release(pid_fd);
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/* equivelent of doing a fflush after every \n */
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setlinebuf(stdout);
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openlog(client_server, LOG_PID | LOG_CONS, LOG_LOCAL0);
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udhcp_logging(LOG_INFO, "%s (v%s) started", client_server, VERSION);
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}
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#else
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static char *syslog_level_msg[] = {
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[LOG_EMERG] = "EMERGENCY!",
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[LOG_ALERT] = "ALERT!",
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[LOG_CRIT] = "critical!",
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[LOG_WARNING] = "warning",
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[LOG_ERR] = "error",
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[LOG_INFO] = "info",
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[LOG_DEBUG] = "debug"
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};
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void udhcp_logging(int level, const char *fmt, ...)
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{
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va_list p;
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va_start(p, fmt);
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if(!daemonized) {
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printf("%s, ", syslog_level_msg[level]);
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vprintf(fmt, p);
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putchar('\n');
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}
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va_end(p);
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}
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void start_log_and_pid(const char *client_server, const char *pidfile)
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{
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int pid_fd;
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/* Make sure our syslog fd isn't overwritten */
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sanitize_fds();
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/* do some other misc startup stuff while we are here to save bytes */
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pid_fd = pidfile_acquire(pidfile);
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pidfile_write_release(pid_fd);
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/* equivelent of doing a fflush after every \n */
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setlinebuf(stdout);
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udhcp_logging(LOG_INFO, "%s (v%s) started", client_server, VERSION);
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}
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#endif
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