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/*
* Copyright (c) 2016-2017 Todd C. Miller <Todd.Miller@sudo.ws>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* This is an open source non-commercial project. Dear PVS-Studio, please check it.
* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
*/
#include <config.h>
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_STRING_H
# include <string.h>
#endif /* HAVE_STRING_H */
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif /* HAVE_STRINGS_H */
#include <syslog.h>
#include "sudo_compat.h"
#ifndef HAVE_VSYSLOG
void
sudo_vsyslog(int pri, const char *fmt, va_list ap)
{
int saved_errno = errno;
char *cp, *ep, msgbuf[8192], new_fmt[2048];
va_list ap2;
size_t len;
/* Rewrite fmt, replacing %m with an errno string. */
for (cp = new_fmt, ep = new_fmt + sizeof(new_fmt); *fmt != '\0'; fmt++) {
if (fmt[0] == '%' && fmt[1] == 'm') {
fmt++;
len = strlcpy(cp, strerror(saved_errno), (ep - cp));
if (len >= (size_t)(ep - cp))
len = (size_t)(ep - cp) - 1;
cp += len;
} else {
if (fmt[0] == '%' && fmt[1] == '%') {
fmt++;
if (cp < ep - 1)
*cp++ = '%';
}
if (cp < ep - 1)
*cp++ = *fmt;
}
}
*cp = '\0';
/* Format message and log it, using a static buffer if possible. */
va_copy(ap2, ap);
len = (size_t)vsnprintf(msgbuf, sizeof(msgbuf), new_fmt, ap2);
va_end(ap2);
if (len < sizeof(msgbuf)) {
syslog(pri, "%s", msgbuf);
} else {
/* Too big for static buffer? */
char *buf;
if (vasprintf(&buf, new_fmt, ap) != -1) {
syslog(pri, "%s", buf);
free(buf);
}
}
}
#endif /* HAVE_VSYSLOG */
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