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3.4 KiB

/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (C) 1996
* David L. Nugent. 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.
*
* THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT 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 DAVID L. NUGENT 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.
*/
#ifndef lint
static const char rcsid[] =
"$FreeBSD$";
#endif /* not lint */
#include <ctype.h>
#include <err.h>
#include <fcntl.h>
#include <string.h>
#include <stdarg.h>
#include "pw.h"
static FILE *logfile = NULL;
void
pw_log(struct userconf * cnf, int mode, int which, char const * fmt,...)
{
va_list argp;
time_t now;
const char *cp, *name;
struct tm *t;
int fd, i, rlen;
char nfmt[256], sname[32];
if (cnf->logfile == NULL || cnf->logfile[0] == '\0') {
return;
}
if (logfile == NULL) {
/* With umask==0 we need to control file access modes on create */
fd = open(cnf->logfile, O_WRONLY | O_CREAT | O_APPEND, 0600);
if (fd == -1) {
return;
}
logfile = fdopen(fd, "a");
if (logfile == NULL) {
return;
}
}
if ((name = getenv("LOGNAME")) == NULL &&
(name = getenv("USER")) == NULL) {
strcpy(sname, "unknown");
} else {
/*
* Since "name" will be embedded in a printf-like format,
* we must sanitize it:
*
* Limit its length so other information in the message
* is not truncated
*
* Squeeze out embedded whitespace for the benefit of
* log file parsers
*
* Escape embedded % characters with another %
*/
for (i = 0, cp = name;
*cp != '\0' && i < (int)sizeof(sname) - 1; cp++) {
if (*cp == '%') {
if (i < (int)sizeof(sname) - 2) {
sname[i++] = '%';
sname[i++] = '%';
} else {
break;
}
} else if (!isspace(*cp)) {
sname[i++] = *cp;
} /* else do nothing */
}
if (i == 0) {
strcpy(sname, "unknown");
} else {
sname[i] = '\0';
}
}
now = time(NULL);
t = localtime(&now);
/* ISO 8601 International Standard Date format */
strftime(nfmt, sizeof nfmt, "%Y-%m-%d %T ", t);
rlen = sizeof(nfmt) - strlen(nfmt);
if (rlen <= 0 || snprintf(nfmt + strlen(nfmt), rlen,
"[%s:%s%s] %s\n", sname, Which[which], Modes[mode],
fmt) >= rlen) {
warnx("log format overflow, user name=%s", sname);
} else {
va_start(argp, fmt);
vfprintf(logfile, nfmt, argp);
va_end(argp);
fflush(logfile);
}
}