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-rw-r--r--misc/syslog.c438
1 files changed, 438 insertions, 0 deletions
diff --git a/misc/syslog.c b/misc/syslog.c
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+++ b/misc/syslog.c
@@ -0,0 +1,438 @@
+/*
+ * Copyright (c) 1983, 1988, 1993
+ * The 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.
+ * 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 8.4 (Berkeley) 3/18/94";
+#endif /* LIBC_SCCS and not lint */
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/syslog.h>
+#include <sys/uio.h>
+#include <netdb.h>
+
+#include <errno.h>
+#include <fcntl.h>
+#include <paths.h>
+#include <stdio.h>
+#include <stdio_ext.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <bits/libc-lock.h>
+#include <signal.h>
+#include <locale.h>
+
+#if __STDC__
+#include <stdarg.h>
+#else
+#include <varargs.h>
+#endif
+
+#include <libio/iolibio.h>
+#define ftell(s) INTUSE(_IO_ftell) (s)
+
+static int LogType = SOCK_DGRAM; /* type of socket connection */
+static int LogFile = -1; /* fd for log */
+static int connected; /* have done connect */
+static int LogStat; /* status bits, set by openlog() */
+static const char *LogTag; /* string to tag the entry with */
+static int LogFacility = LOG_USER; /* default facility code */
+static int LogMask = 0xff; /* mask of priorities to be logged */
+extern char *__progname; /* Program name, from crt0. */
+
+/* Define the lock. */
+__libc_lock_define_initialized (static, syslog_lock)
+
+static void openlog_internal(const char *, int, int) internal_function;
+static void closelog_internal(void);
+#ifndef NO_SIGPIPE
+static void sigpipe_handler (int);
+#endif
+
+#ifndef send_flags
+# define send_flags 0
+#endif
+
+struct cleanup_arg
+{
+ void *buf;
+ struct sigaction *oldaction;
+};
+
+static void
+cancel_handler (void *ptr)
+{
+#ifndef NO_SIGPIPE
+ /* Restore the old signal handler. */
+ struct cleanup_arg *clarg = (struct cleanup_arg *) ptr;
+
+ if (clarg != NULL && clarg->oldaction != NULL)
+ __sigaction (SIGPIPE, clarg->oldaction, NULL);
+#endif
+
+ /* Free the lock. */
+ __libc_lock_unlock (syslog_lock);
+}
+
+
+/*
+ * syslog, vsyslog --
+ * print message on log file; output is intended for syslogd(8).
+ */
+void
+syslog(int pri, const char *fmt, ...)
+{
+ va_list ap;
+
+ va_start(ap, fmt);
+ __vsyslog_chk(pri, -1, fmt, ap);
+ va_end(ap);
+}
+libc_hidden_def (syslog)
+
+void
+__syslog_chk(int pri, int flag, const char *fmt, ...)
+{
+ va_list ap;
+
+ va_start(ap, fmt);
+ __vsyslog_chk(pri, flag, fmt, ap);
+ va_end(ap);
+}
+
+void
+__vsyslog_chk(int pri, int flag, const char *fmt, va_list ap)
+{
+ struct tm now_tm;
+ time_t now;
+ int fd;
+ FILE *f;
+ char *buf = 0;
+ size_t bufsize = 0;
+ size_t prioff, msgoff;
+#ifndef NO_SIGPIPE
+ struct sigaction action, oldaction;
+ int sigpipe;
+#endif
+ int saved_errno = errno;
+ char failbuf[3 * sizeof (pid_t) + sizeof "out of memory []"];
+
+#define INTERNALLOG LOG_ERR|LOG_CONS|LOG_PERROR|LOG_PID
+ /* Check for invalid bits. */
+ if (pri & ~(LOG_PRIMASK|LOG_FACMASK)) {
+ syslog(INTERNALLOG,
+ "syslog: unknown facility/priority: %x", pri);
+ pri &= LOG_PRIMASK|LOG_FACMASK;
+ }
+
+ /* Check priority against setlogmask values. */
+ if ((LOG_MASK (LOG_PRI (pri)) & LogMask) == 0)
+ return;
+
+ /* Set default facility if none specified. */
+ if ((pri & LOG_FACMASK) == 0)
+ pri |= LogFacility;
+
+ /* Build the message in a memory-buffer stream. */
+ f = open_memstream (&buf, &bufsize);
+ if (f == NULL)
+ {
+ /* We cannot get a stream. There is not much we can do but
+ emitting an error messages. */
+ char numbuf[3 * sizeof (pid_t)];
+ char *nump;
+ char *endp = __stpcpy (failbuf, "out of memory [");
+ pid_t pid = __getpid ();
+
+ nump = numbuf + sizeof (numbuf);
+ /* The PID can never be zero. */
+ do
+ *--nump = '0' + pid % 10;
+ while ((pid /= 10) != 0);
+
+ endp = __mempcpy (endp, nump, (numbuf + sizeof (numbuf)) - nump);
+ *endp++ = ']';
+ *endp = '\0';
+ buf = failbuf;
+ bufsize = endp - failbuf;
+ msgoff = 0;
+ }
+ else
+ {
+ __fsetlocking (f, FSETLOCKING_BYCALLER);
+ prioff = fprintf (f, "<%d>", pri);
+ (void) time (&now);
+ f->_IO_write_ptr += __strftime_l (f->_IO_write_ptr,
+ f->_IO_write_end
+ - f->_IO_write_ptr,
+ "%h %e %T ",
+ __localtime_r (&now, &now_tm),
+ &_nl_C_locobj);
+ msgoff = ftell (f);
+ if (LogTag == NULL)
+ LogTag = __progname;
+ if (LogTag != NULL)
+ fputs_unlocked (LogTag, f);
+ if (LogStat & LOG_PID)
+ fprintf (f, "[%d]", (int) __getpid ());
+ if (LogTag != NULL)
+ {
+ putc_unlocked (':', f);
+ putc_unlocked (' ', f);
+ }
+
+ /* Restore errno for %m format. */
+ __set_errno (saved_errno);
+
+ /* We have the header. Print the user's format into the
+ buffer. */
+ if (flag == -1)
+ vfprintf (f, fmt, ap);
+ else
+ __vfprintf_chk (f, flag, fmt, ap);
+
+ /* Close the memory stream; this will finalize the data
+ into a malloc'd buffer in BUF. */
+ fclose (f);
+ }
+
+ /* Output to stderr if requested. */
+ if (LogStat & LOG_PERROR) {
+ struct iovec iov[2];
+ register struct iovec *v = iov;
+
+ v->iov_base = buf + msgoff;
+ v->iov_len = bufsize - msgoff;
+ /* Append a newline if necessary. */
+ if (buf[bufsize - 1] != '\n')
+ {
+ ++v;
+ v->iov_base = (char *) "\n";
+ v->iov_len = 1;
+ }
+
+ __libc_cleanup_push (free, buf == failbuf ? NULL : buf);
+
+ /* writev is a cancellation point. */
+ (void)__writev(STDERR_FILENO, iov, v - iov + 1);
+
+ __libc_cleanup_pop (0);
+ }
+
+ /* Prepare for multiple users. We have to take care: open and
+ write are cancellation points. */
+ struct cleanup_arg clarg;
+ clarg.buf = buf;
+ clarg.oldaction = NULL;
+ __libc_cleanup_push (cancel_handler, &clarg);
+ __libc_lock_lock (syslog_lock);
+
+#ifndef NO_SIGPIPE
+ /* Prepare for a broken connection. */
+ memset (&action, 0, sizeof (action));
+ action.sa_handler = sigpipe_handler;
+ sigemptyset (&action.sa_mask);
+ sigpipe = __sigaction (SIGPIPE, &action, &oldaction);
+ if (sigpipe == 0)
+ clarg.oldaction = &oldaction;
+#endif
+
+ /* Get connected, output the message to the local logger. */
+ if (!connected)
+ openlog_internal(LogTag, LogStat | LOG_NDELAY, 0);
+
+ /* If we have a SOCK_STREAM connection, also send ASCII NUL as
+ a record terminator. */
+ if (LogType == SOCK_STREAM)
+ ++bufsize;
+
+ if (!connected || __send(LogFile, buf, bufsize, send_flags) < 0)
+ {
+ if (connected)
+ {
+ /* Try to reopen the syslog connection. Maybe it went
+ down. */
+ closelog_internal ();
+ openlog_internal(LogTag, LogStat | LOG_NDELAY, 0);
+ }
+
+ if (!connected || __send(LogFile, buf, bufsize, send_flags) < 0)
+ {
+ closelog_internal (); /* attempt re-open next time */
+ /*
+ * 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 (LogStat & LOG_CONS &&
+ (fd = __open(_PATH_CONSOLE, O_WRONLY|O_NOCTTY, 0)) >= 0)
+ {
+ dprintf (fd, "%s\r\n", buf + msgoff);
+ (void)__close(fd);
+ }
+ }
+ }
+
+#ifndef NO_SIGPIPE
+ if (sigpipe == 0)
+ __sigaction (SIGPIPE, &oldaction, (struct sigaction *) NULL);
+#endif
+
+ /* End of critical section. */
+ __libc_cleanup_pop (0);
+ __libc_lock_unlock (syslog_lock);
+
+ if (buf != failbuf)
+ free (buf);
+}
+libc_hidden_def (__vsyslog_chk)
+
+void
+vsyslog(pri, fmt, ap)
+ int pri;
+ register const char *fmt;
+ va_list ap;
+{
+ __vsyslog_chk (pri, -1, fmt, ap);
+}
+libc_hidden_def (vsyslog)
+
+static struct sockaddr SyslogAddr; /* AF_UNIX address of local logger */
+
+
+static void
+internal_function
+openlog_internal(const char *ident, int logstat, int logfac)
+{
+ if (ident != NULL)
+ LogTag = ident;
+ LogStat = logstat;
+ if (logfac != 0 && (logfac &~ LOG_FACMASK) == 0)
+ LogFacility = logfac;
+
+ int retry = 0;
+ while (retry < 2) {
+ 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, LogType, 0))
+ == -1)
+ return;
+ (void)__fcntl(LogFile, F_SETFD, 1);
+ }
+ }
+ if (LogFile != -1 && !connected)
+ {
+ int old_errno = errno;
+ if (__connect(LogFile, &SyslogAddr, sizeof(SyslogAddr))
+ == -1)
+ {
+ int saved_errno = errno;
+ int fd = LogFile;
+ LogFile = -1;
+ (void)__close(fd);
+ __set_errno (old_errno);
+ if (saved_errno == EPROTOTYPE)
+ {
+ /* retry with the other type: */
+ LogType = (LogType == SOCK_DGRAM
+ ? SOCK_STREAM : SOCK_DGRAM);
+ ++retry;
+ continue;
+ }
+ } else
+ connected = 1;
+ }
+ break;
+ }
+}
+
+void
+openlog (const char *ident, int logstat, int logfac)
+{
+ /* Protect against multiple users and cancellation. */
+ __libc_cleanup_push (cancel_handler, NULL);
+ __libc_lock_lock (syslog_lock);
+
+ openlog_internal (ident, logstat, logfac);
+
+ __libc_cleanup_pop (1);
+}
+
+#ifndef NO_SIGPIPE
+static void
+sigpipe_handler (int signo)
+{
+ closelog_internal ();
+}
+#endif
+
+static void
+closelog_internal()
+{
+ if (!connected)
+ return;
+
+ __close (LogFile);
+ LogFile = -1;
+ connected = 0;
+}
+
+void
+closelog ()
+{
+ /* Protect against multiple users and cancellation. */
+ __libc_cleanup_push (cancel_handler, NULL);
+ __libc_lock_lock (syslog_lock);
+
+ closelog_internal ();
+ LogTag = NULL;
+ LogType = SOCK_DGRAM; /* this is the default */
+
+ /* Free the lock. */
+ __libc_cleanup_pop (1);
+}
+
+/* setlogmask -- set the log mask level */
+int
+setlogmask(pmask)
+ int pmask;
+{
+ int omask;
+
+ omask = LogMask;
+ if (pmask != 0)
+ LogMask = pmask;
+ return (omask);
+}
generated by cgit v1.1 at 2024-11-24 13:41:04 +0000