klog.c   [plain text]

/*
 * lib/krb4/klog.c
 *
 * Copyright 1985, 1986, 1987, 1988, 2007 by the Massachusetts Institute of
 * Technology.  All Rights Reserved.
 *
 * Export of this software from the United States of America may
 *   require a specific license from the United States Government.
 *   It is the responsibility of any person or organization contemplating
 *   export to obtain such a license before exporting.
 *
 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
 * distribute this software and its documentation for any purpose and
 * without fee is hereby granted, provided that the above copyright
 * notice appear in all copies and that both that copyright notice and
 * this permission notice appear in supporting documentation, and that
 * the name of M.I.T. not be used in advertising or publicity pertaining
 * to distribution of the software without specific, written prior
 * permission.  Furthermore if you modify this software you must label
 * your software as modified software and not distribute it in such a
 * fashion that it might be confused with the original M.I.T. software.
 * M.I.T. makes no representations about the suitability of
 * this software for any purpose.  It is provided "as is" without express
 * or implied warranty.
 */

#include "krb.h"
#include "autoconf.h"
#ifdef HAVE_TIME_H
#include <time.h>
#endif
#if !defined(VMS) && !defined(_WIN32)
#include <sys/time.h>
#endif
#include <stdio.h>

#include "krb4int.h"
#include <klog.h>
#include "k5-platform.h"

static char *log_name = KRBLOG;
static char logtxt[1000];

/*
 * This file contains two logging routines: kset_logfile()
 * to determine the file to which log entries should be written;
 * and klog() to write log entries to the file.
 */

/*
 * klog() is used to add entries to the logfile (see kset_logfile()
 * below).  Note that it is probably not portable since it makes
 * assumptions about what the compiler will do when it is called
 * with less than the correct number of arguments which is the
 * way it is usually called.
 *
 * The log entry consists of a timestamp and the given arguments
 * printed according to the given "format" string.
 *
 * The log file is opened and closed for each log entry.
 *
 * If the given log type "type" is unknown, or if the log file
 * cannot be opened, no entry is made to the log file.
 *
 * The return value is always a pointer to the formatted log
 * text string "logtxt".
 */

char * klog(type,format,a1,a2,a3,a4,a5,a6,a7,a8,a9,a0)
    int type;
    char *format;
    char *a1,*a2,*a3,*a4,*a5,*a6,*a7,*a8,*a9,*a0;
{
    FILE *logfile;
    time_t now;
    struct tm *tm;
    static int logtype_array[NLOGTYPE];
    static int array_initialized;

    if (!(array_initialized++)) {
        logtype_array[L_NET_ERR] = 1;
        logtype_array[L_KRB_PERR] = 1;
        logtype_array[L_KRB_PWARN] = 1;
        logtype_array[L_APPL_REQ] = 1;
        logtype_array[L_INI_REQ] = 1;
        logtype_array[L_DEATH_REQ] = 1;
        logtype_array[L_NTGT_INTK] = 1;
        logtype_array[L_ERR_SEXP] = 1;
        logtype_array[L_ERR_MKV] = 1;
        logtype_array[L_ERR_NKY] = 1;
        logtype_array[L_ERR_NUN] = 1;
        logtype_array[L_ERR_UNK] = 1;
    }

    (void) snprintf(logtxt,sizeof(logtxt),format,a1,a2,a3,a4,a5,a6,a7,a8,a9,a0);

    if (!logtype_array[type])
	return(logtxt);

    if ((logfile = fopen(log_name,"a")) == NULL)
        return(logtxt);
    set_cloexec_file(logfile);

    (void) time(&now);
    tm = localtime(&now);

    fprintf(logfile,"%2d-%s-%d %02d:%02d:%02d ",tm->tm_mday,
            month_sname(tm->tm_mon + 1),1900+tm->tm_year,
            tm->tm_hour, tm->tm_min, tm->tm_sec);
    fprintf(logfile,"%s\n",logtxt);
    (void) fclose(logfile);
    return(logtxt);
}

/*
 * kset_logfile() changes the name of the file to which
 * messages are logged.  If kset_logfile() is not called,
 * the logfile defaults to KRBLOG, defined in "krb.h".
 */

void
kset_logfile(filename)
    char *filename;
{
    log_name = filename;
}