+/*
+ * Copyright (c) 1983, 1988 Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)syslog.c 5.34 (Berkeley) 6/26/91";
+#endif /* LIBC_SCCS and not lint */
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/file.h>
+#include <sys/syslog.h>
+#include <sys/uio.h>
+#include <sys/errno.h>
+#include <netdb.h>
+#include <string.h>
+#if __STDC__
+#include <stdarg.h>
+#else
+#include <varargs.h>
+#endif
+#include <time.h>
+#include <unistd.h>
+#include <paths.h>
+#include <stdio.h>
+
+static int LogFile = -1; /* fd for log */
+static int connected; /* have done connect */
+static int LogStat = 0; /* status bits, set by openlog() */
+static const char *LogTag = "syslog"; /* string to tag the entry with */
+static int LogFacility = LOG_USER; /* default facility code */
+static int LogMask = 0xff; /* mask of priorities to be logged */
+
+/*
+ * syslog, vsyslog --
+ * print message on log file; output is intended for syslogd(8).
+ */
+void
+#if __STDC__
+syslog(int pri, const char *fmt, ...)
+#else
+syslog(pri, fmt, va_alist)
+ int pri;
+ char *fmt;
+ va_dcl
+#endif
+{
+ va_list ap;
+
+#if __STDC__
+ va_start(ap, fmt);
+#else
+ va_start(ap);
+#endif
+ vsyslog(pri, fmt, ap);
+ va_end(ap);
+}
+
+void
+vsyslog(pri, fmt, ap)
+ int pri;
+ register const char *fmt;
+ va_list ap;
+{
+ register int cnt;
+ register char *p;
+ time_t now, time();
+ int fd, saved_errno;
+ char tbuf[2048], fmt_cpy[1024], *stdp, *ctime();
+
+ /* check for invalid bits or no priority set */
+ if (!LOG_PRI(pri) || (pri &~ (LOG_PRIMASK|LOG_FACMASK)) ||
+ !(LOG_MASK(pri) & LogMask))
+ return;
+
+ saved_errno = errno;
+
+ /* set default facility if none specified */
+ if ((pri & LOG_FACMASK) == 0)
+ pri |= LogFacility;
+
+ /* build the message */
+ (void)time(&now);
+ (void)sprintf(tbuf, "<%d>%.15s ", pri, ctime(&now) + 4);
+ for (p = tbuf; *p; ++p);
+ if (LogStat & LOG_PERROR)
+ stdp = p;
+ if (LogTag) {
+ (void)strcpy(p, LogTag);
+ for (; *p; ++p);
+ }
+ if (LogStat & LOG_PID) {
+ (void)sprintf(p, "[%d]", getpid());
+ for (; *p; ++p);
+ }
+ if (LogTag) {
+ *p++ = ':';
+ *p++ = ' ';
+ }
+
+ /* substitute error message for %m */
+ {
+ register char ch, *t1, *t2;
+ char *strerror();
+
+ for (t1 = fmt_cpy; ch = *fmt; ++fmt)
+ if (ch == '%' && fmt[1] == 'm') {
+ ++fmt;
+ for (t2 = strerror(saved_errno);
+ *t1 = *t2++; ++t1);
+ }
+ else
+ *t1++ = ch;
+ *t1 = '\0';
+ }
+
+ (void)vsprintf(p, fmt_cpy, ap);
+
+ cnt = strlen(tbuf);
+
+ /* output to stderr if requested */
+ if (LogStat & LOG_PERROR) {
+ struct iovec iov[2];
+ register struct iovec *v = iov;
+
+ v->iov_base = stdp;
+ v->iov_len = cnt - (stdp - tbuf);
+ ++v;
+ v->iov_base = "\n";
+ v->iov_len = 1;
+ (void)writev(STDERR_FILENO, iov, 2);
+ }
+
+ /* get connected, output the message to the local logger */
+ if (!connected)
+ openlog(LogTag, LogStat | LOG_NDELAY, 0);
+ if (send(LogFile, tbuf, cnt, 0) >= 0)
+ return;
+
+ /* see if should attempt the console */
+ if (!(LogStat&LOG_CONS))
+ return;
+
+ /*
+ * Output the message to the console; don't worry about blocking,
+ * if console blocks everything will. Make sure the error reported
+ * is the one from the syslogd failure.
+ */
+ if ((fd = open(_PATH_CONSOLE, O_WRONLY, 0)) >= 0) {
+ (void)strcat(tbuf, "\r\n");
+ cnt += 2;
+ p = index(tbuf, '>') + 1;
+ (void)write(fd, p, cnt - (p - tbuf));
+ (void)close(fd);
+ }
+}
+
+static struct sockaddr SyslogAddr; /* AF_UNIX address of local logger */
+
+void
+openlog(ident, logstat, logfac)
+ const char *ident;
+ int logstat, logfac;
+{
+ if (ident != NULL)
+ LogTag = ident;
+ LogStat = logstat;
+ if (logfac != 0 && (logfac &~ LOG_FACMASK) == 0)
+ LogFacility = logfac;
+
+ if (LogFile == -1) {
+ SyslogAddr.sa_family = AF_UNIX;
+ (void)strncpy(SyslogAddr.sa_data, _PATH_LOG,
+ sizeof(SyslogAddr.sa_data));
+ if (LogStat & LOG_NDELAY) {
+ if ((LogFile = socket(AF_UNIX, SOCK_DGRAM, 0)) == -1)
+ return;
+ (void)fcntl(LogFile, F_SETFD, 1);
+ }
+ }
+ if (LogFile != -1 && !connected)
+ if (connect(LogFile, &SyslogAddr, sizeof(SyslogAddr)) == -1) {
+ (void)close(LogFile);
+ LogFile = -1;
+ } else
+ connected = 1;
+}
+
+void
+closelog()
+{
+ (void)close(LogFile);
+ LogFile = -1;
+ connected = 0;
+}
+
+/* setlogmask -- set the log mask level */
+setlogmask(pmask)
+ int pmask;
+{
+ int omask;
+
+ omask = LogMask;
+ if (pmask != 0)
+ LogMask = pmask;
+ return (omask);
+}
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