94998878b7
to the console in a final attempt to log something. Make this final attempt non-blocking so that a blocking console doesn't end up blocking process which attempt to syslog something. In particular, this means you should be able to su and fix the problem if the console becomes blocking. MFC after: 3 weeks
366 lines
8.9 KiB
C
366 lines
8.9 KiB
C
/*
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* Copyright (c) 1983, 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)syslog.c 8.5 (Berkeley) 4/29/95";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "namespace.h"
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/syslog.h>
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#include <sys/uio.h>
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#include <sys/un.h>
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#include <netdb.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <paths.h>
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#include <stdio.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#if __STDC__
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#include <stdarg.h>
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#else
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#include <varargs.h>
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#endif
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#include "un-namespace.h"
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static int LogFile = -1; /* fd for log */
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static int connected; /* have done connect */
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static int opened; /* have done openlog() */
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static int LogStat = 0; /* status bits, set by openlog() */
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static const char *LogTag = NULL; /* string to tag the entry with */
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static int LogFacility = LOG_USER; /* default facility code */
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static int LogMask = 0xff; /* mask of priorities to be logged */
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extern char *__progname; /* Program name, from crt0. */
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static void disconnectlog(void); /* disconnect from syslogd */
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static void connectlog(void); /* (re)connect to syslogd */
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/*
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* Format of the magic cookie passed through the stdio hook
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*/
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struct bufcookie {
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char *base; /* start of buffer */
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int left;
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};
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/*
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* stdio write hook for writing to a static string buffer
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* XXX: Maybe one day, dynamically allocate it so that the line length
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* is `unlimited'.
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*/
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static
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int writehook(cookie, buf, len)
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void *cookie; /* really [struct bufcookie *] */
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char *buf; /* characters to copy */
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int len; /* length to copy */
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{
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struct bufcookie *h; /* private `handle' */
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h = (struct bufcookie *)cookie;
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if (len > h->left) {
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/* clip in case of wraparound */
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len = h->left;
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}
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if (len > 0) {
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(void)memcpy(h->base, buf, len); /* `write' it. */
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h->base += len;
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h->left -= len;
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}
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return 0;
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}
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/*
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* syslog, vsyslog --
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* print message on log file; output is intended for syslogd(8).
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*/
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void
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#if __STDC__
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syslog(int pri, const char *fmt, ...)
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#else
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syslog(pri, fmt, va_alist)
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int pri;
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char *fmt;
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va_dcl
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#endif
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{
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va_list ap;
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#if __STDC__
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va_start(ap, fmt);
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#else
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va_start(ap);
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#endif
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vsyslog(pri, fmt, ap);
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va_end(ap);
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}
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void
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vsyslog(pri, fmt, ap)
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int pri;
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const char *fmt;
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va_list ap;
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{
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int cnt;
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char ch, *p;
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time_t now;
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int fd, saved_errno;
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char *stdp, tbuf[2048], fmt_cpy[1024], timbuf[26];
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FILE *fp, *fmt_fp;
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struct bufcookie tbuf_cookie;
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struct bufcookie fmt_cookie;
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#define INTERNALLOG LOG_ERR|LOG_CONS|LOG_PERROR|LOG_PID
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/* Check for invalid bits. */
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if (pri & ~(LOG_PRIMASK|LOG_FACMASK)) {
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syslog(INTERNALLOG,
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"syslog: unknown facility/priority: %x", pri);
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pri &= LOG_PRIMASK|LOG_FACMASK;
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}
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/* Check priority against setlogmask values. */
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if (!(LOG_MASK(LOG_PRI(pri)) & LogMask))
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return;
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saved_errno = errno;
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/* Set default facility if none specified. */
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if ((pri & LOG_FACMASK) == 0)
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pri |= LogFacility;
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/* Create the primary stdio hook */
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tbuf_cookie.base = tbuf;
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tbuf_cookie.left = sizeof(tbuf);
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fp = fwopen(&tbuf_cookie, writehook);
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if (fp == NULL)
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return;
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/* Build the message. */
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(void)time(&now);
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(void)fprintf(fp, "<%d>", pri);
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(void)fprintf(fp, "%.15s ", ctime_r(&now, timbuf) + 4);
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if (LogStat & LOG_PERROR) {
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/* Transfer to string buffer */
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(void)fflush(fp);
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stdp = tbuf + (sizeof(tbuf) - tbuf_cookie.left);
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}
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if (LogTag == NULL)
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LogTag = __progname;
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if (LogTag != NULL)
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(void)fprintf(fp, "%s", LogTag);
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if (LogStat & LOG_PID)
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(void)fprintf(fp, "[%d]", getpid());
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if (LogTag != NULL) {
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(void)fprintf(fp, ": ");
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}
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/* Check to see if we can skip expanding the %m */
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if (strstr(fmt, "%m")) {
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/* Create the second stdio hook */
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fmt_cookie.base = fmt_cpy;
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fmt_cookie.left = sizeof(fmt_cpy) - 1;
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fmt_fp = fwopen(&fmt_cookie, writehook);
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if (fmt_fp == NULL) {
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fclose(fp);
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return;
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}
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/* Substitute error message for %m. */
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for ( ; (ch = *fmt); ++fmt)
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if (ch == '%' && fmt[1] == 'm') {
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++fmt;
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fputs(strerror(saved_errno), fmt_fp);
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} else
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fputc(ch, fmt_fp);
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/* Null terminate if room */
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fputc(0, fmt_fp);
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fclose(fmt_fp);
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/* Guarantee null termination */
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fmt_cpy[sizeof(fmt_cpy) - 1] = '\0';
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fmt = fmt_cpy;
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}
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(void)vfprintf(fp, fmt, ap);
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(void)fclose(fp);
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cnt = sizeof(tbuf) - tbuf_cookie.left;
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/* Output to stderr if requested. */
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if (LogStat & LOG_PERROR) {
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struct iovec iov[2];
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struct iovec *v = iov;
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v->iov_base = stdp;
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v->iov_len = cnt - (stdp - tbuf);
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++v;
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v->iov_base = "\n";
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v->iov_len = 1;
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(void)_writev(STDERR_FILENO, iov, 2);
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}
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/* Get connected, output the message to the local logger. */
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if (!opened)
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openlog(LogTag, LogStat | LOG_NDELAY, 0);
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connectlog();
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if (send(LogFile, tbuf, cnt, 0) >= 0)
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return;
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/*
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* If the send() failed, the odds are syslogd was restarted.
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* Make one (only) attempt to reconnect to /dev/log.
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*/
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disconnectlog();
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connectlog();
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if (send(LogFile, tbuf, cnt, 0) >= 0)
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return;
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/*
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* Output the message to the console; try not to block
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* as a blocking console should not stop other processes.
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* Make sure the error reported is the one from the syslogd failure.
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*/
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if (LogStat & LOG_CONS &&
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(fd = _open(_PATH_CONSOLE, O_WRONLY|O_NONBLOCK, 0)) >= 0) {
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struct iovec iov[2];
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struct iovec *v = iov;
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p = strchr(tbuf, '>') + 1;
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v->iov_base = p;
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v->iov_len = cnt - (p - tbuf);
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++v;
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v->iov_base = "\r\n";
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v->iov_len = 2;
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(void)_writev(fd, iov, 2);
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(void)_close(fd);
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}
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}
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static void
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disconnectlog()
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{
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/*
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* If the user closed the FD and opened another in the same slot,
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* that's their problem. They should close it before calling on
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* system services.
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*/
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if (LogFile != -1) {
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_close(LogFile);
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LogFile = -1;
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}
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connected = 0; /* retry connect */
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}
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static void
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connectlog()
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{
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struct sockaddr_un SyslogAddr; /* AF_UNIX address of local logger */
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if (LogFile == -1) {
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if ((LogFile = _socket(AF_UNIX, SOCK_DGRAM, 0)) == -1)
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return;
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(void)_fcntl(LogFile, F_SETFD, 1);
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}
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if (LogFile != -1 && !connected) {
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SyslogAddr.sun_len = sizeof(SyslogAddr);
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SyslogAddr.sun_family = AF_UNIX;
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(void)strncpy(SyslogAddr.sun_path, _PATH_LOG,
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sizeof SyslogAddr.sun_path);
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connected = _connect(LogFile, (struct sockaddr *)&SyslogAddr,
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sizeof(SyslogAddr)) != -1;
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if (!connected) {
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/*
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* Try the old "/dev/log" path, for backward
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* compatibility.
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*/
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(void)strncpy(SyslogAddr.sun_path, _PATH_OLDLOG,
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sizeof SyslogAddr.sun_path);
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connected = _connect(LogFile,
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(struct sockaddr *)&SyslogAddr,
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sizeof(SyslogAddr)) != -1;
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}
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if (!connected) {
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(void)_close(LogFile);
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LogFile = -1;
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}
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}
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}
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void
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openlog(ident, logstat, logfac)
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const char *ident;
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int logstat, logfac;
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{
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if (ident != NULL)
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LogTag = ident;
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LogStat = logstat;
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if (logfac != 0 && (logfac &~ LOG_FACMASK) == 0)
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LogFacility = logfac;
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if (LogStat & LOG_NDELAY) /* open immediately */
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connectlog();
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opened = 1; /* ident and facility has been set */
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}
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void
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closelog()
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{
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(void)_close(LogFile);
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LogFile = -1;
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connected = 0;
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}
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/* setlogmask -- set the log mask level */
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int
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setlogmask(pmask)
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int pmask;
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{
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int omask;
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omask = LogMask;
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if (pmask != 0)
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LogMask = pmask;
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return (omask);
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}
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