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/* $OpenBSD: syslog_r.c,v 1.7 2015/01/21 19:34:24 deraadt Exp $ */
/*
* 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.
* 3. 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.
*/
#include <sys/types.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 <string.h>
#include <time.h>
#include <unistd.h>
#include <limits.h>
#include <stdarg.h>
extern char *__progname; /* Program name, from crt0. */
int sendsyslog(const char *, size_t);
void __vsyslog_r(int pri, struct syslog_data *, size_t (*)(char *, size_t),
const char *, va_list);
/* Reentrant version of syslog, i.e. syslog_r() */
/* PRINTFLIKE3 */
void
syslog_r(int pri, struct syslog_data *data, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vsyslog_r(pri, data, fmt, ap);
va_end(ap);
}
void
vsyslog_r(int pri, struct syslog_data *data, const char *fmt, va_list ap)
{
const char *ident;
__vsyslog_r(pri, data, NULL, fmt, ap);
/* close the socket without losing log_tag */
ident = data->log_tag;
closelog_r(data);
data->log_tag = ident;
}
/*
* This is used by both syslog_r and syslog. The latter supplies
* a non-NULL gettime callback for filling in the date, but we also
* use the presence of that callback to decide whether it's safe
* to call strerror and what the name of the caller is
*/
void
__vsyslog_r(int pri, struct syslog_data *data,
size_t (*gettime)(char *, size_t), const char *fmt, va_list ap)
{
int cnt;
char ch, *p, *t;
int fd, saved_errno, error;
#define TBUF_LEN 2048
#define FMT_LEN 1024
char *conp = NULL, *stdp = NULL, tbuf[TBUF_LEN], fmt_cpy[FMT_LEN];
int tbuf_left, fmt_left, prlen;
#define INTERNALLOG LOG_ERR|LOG_CONS|LOG_PERROR|LOG_PID
/* Check for invalid bits. */
if (pri & ~(LOG_PRIMASK|LOG_FACMASK)) {
syslog_r(INTERNALLOG, data,
"syslog%s: unknown facility/priority: %x",
gettime != NULL ? "" : "_r", pri);
pri &= LOG_PRIMASK|LOG_FACMASK;
}
/* Check priority against setlogmask values. */
if (!(LOG_MASK(LOG_PRI(pri)) & data->log_mask))
return;
saved_errno = errno;
/* Set default facility if none specified. */
if ((pri & LOG_FACMASK) == 0)
pri |= data->log_fac;
p = tbuf;
tbuf_left = TBUF_LEN;
#define DEC() \
do { \
if (prlen < 0) \
prlen = 0; \
if (prlen >= tbuf_left) \
prlen = tbuf_left - 1; \
p += prlen; \
tbuf_left -= prlen; \
} while (0)
prlen = snprintf(p, tbuf_left, "<%d>", pri);
DEC();
if (data->log_stat & LOG_CONS)
conp = p;
/*
* syslogd will expand time automagically for reentrant case, and
* for normal case, invoke the callback to do it just do like before
*/
if (gettime != NULL) {
prlen = gettime(p, tbuf_left);
DEC();
}
if (data->log_stat & LOG_PERROR)
stdp = p;
if (data->log_tag == NULL)
data->log_tag = __progname;
if (data->log_tag != NULL) {
prlen = snprintf(p, tbuf_left, "%.*s", NAME_MAX, data->log_tag);
DEC();
}
if (data->log_stat & LOG_PID) {
prlen = snprintf(p, tbuf_left, "[%ld]", (long)getpid());
DEC();
}
if (data->log_tag != NULL) {
if (tbuf_left > 1) {
*p++ = ':';
tbuf_left--;
}
if (tbuf_left > 1) {
*p++ = ' ';
tbuf_left--;
}
}
/* strerror() is not reentrant */
for (t = fmt_cpy, fmt_left = FMT_LEN; (ch = *fmt); ++fmt) {
if (ch == '%' && fmt[1] == 'm') {
++fmt;
if (gettime != NULL) {
prlen = snprintf(t, fmt_left, "%s",
strerror(saved_errno));
} else {
prlen = snprintf(t, fmt_left, "Error %d",
saved_errno);
}
if (prlen < 0)
prlen = 0;
if (prlen >= fmt_left)
prlen = fmt_left - 1;
t += prlen;
fmt_left -= prlen;
} else if (ch == '%' && fmt[1] == '%' && fmt_left > 2) {
*t++ = '%';
*t++ = '%';
fmt++;
fmt_left -= 2;
} else {
if (fmt_left > 1) {
*t++ = ch;
fmt_left--;
}
}
}
*t = '\0';
prlen = vsnprintf(p, tbuf_left, fmt_cpy, ap);
DEC();
cnt = p - tbuf;
while (cnt > 0 && p[-1] == '\n') {
*(--p) = '\0';
--cnt;
}
/* Output to stderr if requested. */
if (data->log_stat & LOG_PERROR) {
struct iovec iov[2];
iov[0].iov_base = stdp;
iov[0].iov_len = cnt > stdp - tbuf ? cnt - (stdp - tbuf) : 0;
iov[1].iov_base = "\n";
iov[1].iov_len = 1;
(void)writev(STDERR_FILENO, iov, 2);
}
/*
* If the sendsyslog() fails, it means that syslogd
* is not running.
*/
error = sendsyslog(tbuf, cnt);
/*
* Output the message to the console; try not to block
* as a blocking console should not stop other processes.
* Make sure the error reported is the one from the syslogd failure.
*/
if (error == -1 && (data->log_stat & LOG_CONS) &&
(fd = open(_PATH_CONSOLE, O_WRONLY|O_NONBLOCK, 0)) >= 0) {
struct iovec iov[2];
iov[0].iov_base = conp;
iov[0].iov_len = cnt > conp - tbuf ? cnt - (conp - tbuf) : 0;
iov[1].iov_base = "\r\n";
iov[1].iov_len = 2;
(void)writev(fd, iov, 2);
(void)close(fd);
}
}
void
openlog_r(const char *ident, int logstat, int logfac, struct syslog_data *data)
{
if (ident != NULL)
data->log_tag = ident;
data->log_stat = logstat;
if (logfac != 0 && (logfac &~ LOG_FACMASK) == 0)
data->log_fac = logfac;
}
void
closelog_r(struct syslog_data *data)
{
data->log_tag = NULL;
}
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