kadm5/clnt/logger.c

/*
 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
 * lib/kadm/logger.c
 *
 * Copyright 1995 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.
 *
 */

/* KADM5 wants non-syslog log files to contain syslog-like entries */
#define VERBOSE_LOGS

/*
 * logger.c - Handle logging functions for those who want it.
 */
#include "k5-int.h"
#include "adm_proto.h"
#include "com_err.h"
#include <stdio.h>
#include <ctype.h>
#include <ctype.h>
#ifdef  HAVE_SYSLOG_H
#include <syslog.h>
#endif  /* HAVE_SYSLOG_H */
#ifdef  HAVE_STDARG_H
#include <stdarg.h>
#else   /* HAVE_STDARG_H */
#include <varargs.h>
#endif  /* HAVE_STDARG_H */
#include <libintl.h>
#include <sys/types.h>
#include <sys/stat.h>

#define KRB5_KLOG_MAX_ERRMSG_SIZE   2048
#ifndef MAXHOSTNAMELEN
#define MAXHOSTNAMELEN  256
#endif  /* MAXHOSTNAMELEN */

#define LSPEC_PARSE_ERR_1   1
#define LSPEC_PARSE_ERR_2   2
#define LOG_FILE_ERR        3
#define LOG_DEVICE_ERR      4
#define LOG_UFO_STRING      5
#define LOG_EMERG_STRING    6
#define LOG_ALERT_STRING    7
#define LOG_CRIT_STRING     8
#define LOG_ERR_STRING      9
#define LOG_WARNING_STRING  10
#define LOG_NOTICE_STRING   11
#define LOG_INFO_STRING 12
#define LOG_DEBUG_STRING    13
/* This is to assure that we have at least one match in the syslog stuff */
/*
static const char LSPEC_PARSE_ERR_1[] = "%s: cannot parse <%s>\n";
static const char LSPEC_PARSE_ERR_2[] = "%s: warning - logging entry syntax error\n";
static const char LOG_FILE_ERR[] =  "%s: error writing to %s\n";
static const char LOG_DEVICE_ERR[] =    "%s: error writing to %s device\n";
static const char LOG_UFO_STRING[] =    "???";
static const char LOG_EMERG_STRING[] =  "EMERGENCY";
static const char LOG_ALERT_STRING[] =  "ALERT";
static const char LOG_CRIT_STRING[] =   "CRITICAL";
static const char LOG_ERR_STRING[] =    "Error";
static const char LOG_WARNING_STRING[] =    "Warning";
static const char LOG_NOTICE_STRING[] = "Notice";
static const char LOG_INFO_STRING[] =   "info";
static const char LOG_DEBUG_STRING[] =  "debug";
*/


const char *
krb5_log_error_table(long errorno) {
switch (errorno) {
    case LSPEC_PARSE_ERR_1:
        return(gettext("%s: cannot parse <%s>\n"));
    case LSPEC_PARSE_ERR_2:
        return(gettext("%s: warning - logging entry syntax error\n"));
    case LOG_FILE_ERR:
        return(gettext("%s: error writing to %s\n"));
    case LOG_DEVICE_ERR:
        return(gettext("%s: error writing to %s device\n"));
    case LOG_UFO_STRING:
        return(gettext("???"));
    case LOG_EMERG_STRING:
        return(gettext("EMERGENCY"));
    case LOG_ALERT_STRING:
        return(gettext("ALERT"));
    case LOG_CRIT_STRING:
        return(gettext("CRITICAL"));
    case LOG_ERR_STRING:
        return(gettext("Error"));
    case LOG_WARNING_STRING:
        return(gettext("Warning"));
    case LOG_NOTICE_STRING:
        return(gettext("Notice"));
    case LOG_INFO_STRING:
    case LOG_DEBUG_STRING:
    default:
        return(gettext("info"));
    }
}

/*
 * Output logging.
 *
 * Output logging is now controlled by the configuration file.  We can specify
 * the following syntaxes under the [logging]->entity specification.
 *  FILE<opentype><pathname>
 *  SYSLOG[=<severity>[:<facility>]]
 *  STDERR
 *  CONSOLE
 *  DEVICE=<device-spec>
 *
 * Where:
 *  <opentype> is ":" for open/append, "=" for open/create.
 *  <pathname> is a valid path name.
 *  <severity> is one of: (default = ERR)
 *      EMERG
 *      ALERT
 *      CRIT
 *      ERR
 *      WARNING
 *      NOTICE
 *      INFO
 *      DEBUG
 *  <facility> is one of: (default = AUTH)
 *      KERN
 *      USER
 *      MAIL
 *      DAEMON
 *      AUTH
 *      LPR
 *      NEWS
 *      UUCP
 *      AUDIT
 *      CRON
 *      LOCAL0..LOCAL7
 *  <device-spec> is a valid device specification.
 */
struct log_entry {
    enum log_type { K_LOG_FILE,
            K_LOG_SYSLOG,
            K_LOG_STDERR,
            K_LOG_CONSOLE,
            K_LOG_DEVICE,
            K_LOG_NONE } log_type;
    krb5_pointer log_2free;
    union log_union {
    struct log_file {
        FILE    *lf_filep;
        char    *lf_fname;
        char    *lf_fopen_mode; /* "a+" or "w" */
#define K_LOG_DEF_FILE_ROTATE_PERIOD    -1  /* never */
#define K_LOG_DEF_FILE_ROTATE_VERSIONS  0   /* no versions */
        time_t  lf_rotate_period;
        time_t  lf_last_rotated;
        int     lf_rotate_versions;
    } log_file;
    struct log_syslog {
        int     ls_facility;
        int     ls_severity;
    } log_syslog;
    struct log_device {
        FILE    *ld_filep;
        char    *ld_devname;
    } log_device;
    } log_union;
};
#define lfu_filep   log_union.log_file.lf_filep
#define lfu_fname   log_union.log_file.lf_fname
#define lfu_fopen_mode  log_union.log_file.lf_fopen_mode
#define lfu_rotate_period   log_union.log_file.lf_rotate_period
#define lfu_last_rotated    log_union.log_file.lf_last_rotated
#define lfu_rotate_versions log_union.log_file.lf_rotate_versions
#define lsu_facility    log_union.log_syslog.ls_facility
#define lsu_severity    log_union.log_syslog.ls_severity
#define ldu_filep   log_union.log_device.ld_filep
#define ldu_devname log_union.log_device.ld_devname

struct log_control {
    struct log_entry    *log_entries;
    int         log_nentries;
    char        *log_whoami;
    char        *log_hostname;
    krb5_boolean    log_opened;
};

static struct log_control log_control = {
    (struct log_entry *) NULL,
    0,
    (char *) NULL,
    (char *) NULL,
    0
};
static struct log_entry def_log_entry;

/*
 * These macros define any special processing that needs to happen for
 * devices.  For unix, of course, this is hardly anything.
 */
#define DEVICE_OPEN(d, m)   fopen(d, m)
#define CONSOLE_OPEN(m)     fopen("/dev/console", m)
#define DEVICE_PRINT(f, m)  ((fprintf(f, "%s\r\n", m) >= 0) ?   \
                 (fflush(f), 0) :           \
                 -1)
#define DEVICE_CLOSE(d)     fclose(d)


/*
 * klog_rotate() - roate a log file if we have specified rotation
 * parameters in krb5.conf.
 */
static void
klog_rotate(struct log_entry *le)
{
    time_t t;
    int i;
    char *name_buf1;
    char *name_buf2;
    char *old_name;
    char *new_name;
    char *tmp;
    FILE *fp;
    int num_vers;
    mode_t old_umask;


    /*
     * By default we don't rotate.
     */
    if (le->lfu_rotate_period == K_LOG_DEF_FILE_ROTATE_PERIOD)
        return;

    t = time(0);

    if (t >= le->lfu_last_rotated + le->lfu_rotate_period) {
        /*
         * The N log file versions will be renamed X.N-1 X.N-2, ... X.0.
         * So the allocate file name buffers that can the version
         * number extensions.
         * 32 extra bytes is plenty.
         */
        name_buf1 = malloc(strlen(le->lfu_fname) + 32);

        if (name_buf1 == NULL)
            return;

        name_buf2 = malloc(strlen(le->lfu_fname) + 32);

        if (name_buf2 == NULL) {
            free(name_buf1);
            return;
        }

        old_name = name_buf1;
        new_name = name_buf2;

        /*
         * If there N versions, then the first one has file extension
         * of N-1.
         */
        (void) sprintf(new_name, "%s.%d", le->lfu_fname,
            le->lfu_rotate_versions - 1);

        /*
         * Rename file.N-2 to file.N-1, file.N-3 to file.N-2, ...
         * file.0 to file.1
         */
        for (i = le->lfu_rotate_versions - 1; i > 0; i--) {
            (void) sprintf(old_name, "%s.%d", le->lfu_fname, i - 1);
            (void) rename(old_name, new_name);

            /*
             * swap old name and new name. This way,
             * on the next iteration, new_name.X
             * becomes new_name.X-1.
             */
            tmp = old_name;
            old_name = new_name;
            new_name = tmp;
        }
        old_name = le->lfu_fname;

        (void) rename(old_name, new_name);

        /*
         * Even though we don't know yet if the fopen()
         * of the log file will succeed, we mark the log
         * as rotated. This is so we don't repeatably
         * rotate file.N-2 to file.N-1 ... etc without
         * waiting for the rotate period to elapse.
         */
        le->lfu_last_rotated = t;

        /*
         * Default log file creation mode should be read-only
         * by owner(root), but the admin can override with
         * chmod(1) if desired.
         */

        old_umask = umask(077);
        fp = fopen(old_name, le->lfu_fopen_mode);

        umask(old_umask);

        if (fp != NULL) {

            (void) fclose(le->lfu_filep);
            le->lfu_filep = fp;

            /*
             * If the version parameter in krb5.conf was
             * 0, then we take this to mean that rotating the
             * log file will cause us to dispose of the
             * old one, and created a new one. We have just
             * renamed the old one to file.-1, so remove it.
             */
            if (le->lfu_rotate_versions <= 0)
                (void) unlink(new_name);

        } else {
            fprintf(stderr,
        gettext("During rotate, couldn't open log file %s: %s\n"),
                old_name, error_message(errno));
            /*
             * Put it back.
             */
            (void) rename(new_name, old_name);
        }
        free(name_buf1);
        free(name_buf2);
    }
}

/*
 * klog_com_err_proc()  - Handle com_err(3) messages as specified by the
 *            profile.
 */
static krb5_context err_context;
static void
klog_com_err_proc(const char *whoami, long code, const char *format, va_list ap)
{
    char    outbuf[KRB5_KLOG_MAX_ERRMSG_SIZE];
    int     lindex;
    const char  *actual_format;
#ifdef  HAVE_SYSLOG
    int     log_pri = -1;
#endif  /* HAVE_SYSLOG */
    char    *cp;
    char    *syslogp;

    /* Make the header */
    sprintf(outbuf, "%s: ", whoami);
    /*
     * Squirrel away address after header for syslog since syslog makes
     * a header
     */
    syslogp = &outbuf[strlen(outbuf)];

    /* If reporting an error message, separate it. */
    if (code) {
        const char *emsg;
        outbuf[sizeof(outbuf) - 1] = '\0';

    emsg = krb5_get_error_message (err_context, code);
    strncat(outbuf, emsg, sizeof(outbuf) - 1 - strlen(outbuf));
    strncat(outbuf, " - ", sizeof(outbuf) - 1 - strlen(outbuf));
    krb5_free_error_message(err_context, emsg);
    }
    cp = &outbuf[strlen(outbuf)];

    actual_format = format;
#ifdef  HAVE_SYSLOG
    /*
     * This is an unpleasant hack.  If the first character is less than
     * 8, then we assume that it is a priority.
     *
     * Since it is not guaranteed that there is a direct mapping between
     * syslog priorities (e.g. Ultrix and old BSD), we resort to this
     * intermediate representation.
     */
    if ((((unsigned char) *format) > 0) && (((unsigned char) *format) <= 8)) {
    actual_format = (format + 1);
    switch ((unsigned char) *format) {
#ifdef  LOG_EMERG
    case 1:
        log_pri = LOG_EMERG;
        break;
#endif /* LOG_EMERG */
#ifdef  LOG_ALERT
    case 2:
        log_pri = LOG_ALERT;
        break;
#endif /* LOG_ALERT */
#ifdef  LOG_CRIT
    case 3:
        log_pri = LOG_CRIT;
        break;
#endif /* LOG_CRIT */
    default:
    case 4:
        log_pri = LOG_ERR;
        break;
#ifdef  LOG_WARNING
    case 5:
        log_pri = LOG_WARNING;
        break;
#endif /* LOG_WARNING */
#ifdef  LOG_NOTICE
    case 6:
        log_pri = LOG_NOTICE;
        break;
#endif /* LOG_NOTICE */
#ifdef  LOG_INFO
    case 7:
        log_pri = LOG_INFO;
        break;
#endif /* LOG_INFO */
#ifdef  LOG_DEBUG
    case 8:
        log_pri = LOG_DEBUG;
        break;
#endif /* LOG_DEBUG */
    }
    }
#endif  /* HAVE_SYSLOG */

    /* Now format the actual message */
#if HAVE_VSNPRINTF
    vsnprintf(cp, sizeof(outbuf) - (cp - outbuf), actual_format, ap);
#elif   HAVE_VSPRINTF
    vsprintf(cp, actual_format, ap);
#else   /* HAVE_VSPRINTF */
    sprintf(cp, actual_format, ((int *) ap)[0], ((int *) ap)[1],
        ((int *) ap)[2], ((int *) ap)[3],
        ((int *) ap)[4], ((int *) ap)[5]);
#endif  /* HAVE_VSPRINTF */

    /*
     * Now that we have the message formatted, perform the output to each
     * logging specification.
     */
    for (lindex = 0; lindex < log_control.log_nentries; lindex++) {
    switch (log_control.log_entries[lindex].log_type) {
    case K_LOG_FILE:

        klog_rotate(&log_control.log_entries[lindex]);
        /*FALLTHRU*/
    case K_LOG_STDERR:
        /*
         * Files/standard error.
         */
        if (fprintf(log_control.log_entries[lindex].lfu_filep, "%s\n",
            outbuf) < 0) {
        /* Attempt to report error */
        fprintf(stderr, krb5_log_error_table(LOG_FILE_ERR), whoami,
            log_control.log_entries[lindex].lfu_fname);
        }
        else {
        fflush(log_control.log_entries[lindex].lfu_filep);
        }
        break;
    case K_LOG_CONSOLE:
    case K_LOG_DEVICE:
        /*
         * Devices (may need special handling)
         */
        if (DEVICE_PRINT(log_control.log_entries[lindex].ldu_filep,
                 outbuf) < 0) {
        /* Attempt to report error */
        fprintf(stderr, krb5_log_error_table(LOG_DEVICE_ERR), whoami,
            log_control.log_entries[lindex].ldu_devname);
        }
        break;
#ifdef  HAVE_SYSLOG
    case K_LOG_SYSLOG:
        /*
         * System log.
         */
        /*
         * If we have specified a priority through our hackery, then
         * use it, otherwise use the default.
         */
        if (log_pri >= 0)
        log_pri |= log_control.log_entries[lindex].lsu_facility;
        else
        log_pri = log_control.log_entries[lindex].lsu_facility |
            log_control.log_entries[lindex].lsu_severity;

        /* Log the message with our header trimmed off */
        syslog(log_pri, syslogp);
        break;
#endif /* HAVE_SYSLOG */
    default:
        break;
    }
    }
}

/*
 * krb5_klog_init() - Initialize logging.
 *
 * This routine parses the syntax described above to specify destinations for
 * com_err(3) or krb5_klog_syslog() messages generated by the caller.
 *
 * Parameters:
 *  kcontext    - Kerberos context.
 *  ename       - Entity name as it is to appear in the profile.
 *  whoami      - Entity name as it is to appear in error output.
 *  do_com_err  - Take over com_err(3) processing.
 *
 * Implicit inputs:
 *  stderr      - This is where STDERR output goes.
 *
 * Implicit outputs:
 *  log_nentries    - Number of log entries, both valid and invalid.
 *  log_control - List of entries (log_nentries long) which contains
 *            data for klog_com_err_proc() to use to determine
 *            where/how to send output.
 */
krb5_error_code
krb5_klog_init(krb5_context kcontext, char *ename, char *whoami, krb5_boolean do_com_err)
{
    const char  *logging_profent[3];
    const char  *logging_defent[3];
    char    **logging_specs;
    int     i, ngood;
    char    *cp, *cp2;
    char    savec = '\0';
    int     error;
    int     do_openlog, log_facility;
    FILE    *f;
    mode_t      old_umask;

    /* Initialize */
    do_openlog = 0;
    log_facility = 0;

    err_context = kcontext;

    /*
     * Look up [logging]-><ename> in the profile.  If that doesn't
     * succeed, then look for [logging]->default.
     */
    logging_profent[0] = "logging";
    logging_profent[1] = ename;
    logging_profent[2] = (char *) NULL;
    logging_defent[0] = "logging";
    logging_defent[1] = "default";
    logging_defent[2] = (char *) NULL;
    logging_specs = (char **) NULL;
    ngood = 0;
    log_control.log_nentries = 0;
    if (!profile_get_values(kcontext->profile,
                logging_profent,
                &logging_specs) ||
    !profile_get_values(kcontext->profile,
                logging_defent,
                &logging_specs)) {
    /*
     * We have a match, so we first count the number of elements
     */
    for (log_control.log_nentries = 0;
         logging_specs[log_control.log_nentries];
         log_control.log_nentries++);

    /*
     * Now allocate our structure.
     */
    log_control.log_entries = (struct log_entry *)
        malloc(log_control.log_nentries * sizeof(struct log_entry));
    if (log_control.log_entries) {
        /*
         * Scan through the list.
         */
        for (i=0; i<log_control.log_nentries; i++) {
        log_control.log_entries[i].log_type = K_LOG_NONE;
        log_control.log_entries[i].log_2free = logging_specs[i];
        /*
         * The format is:
         *  <whitespace><data><whitespace>
         * so, trim off the leading and trailing whitespace here.
         */
        for (cp = logging_specs[i]; isspace((int) *cp); cp++);
        for (cp2 = &logging_specs[i][strlen(logging_specs[i])-1];
             isspace((int) *cp2); cp2--);
        cp2++;
        *cp2 = '\0';
        /*
         * Is this a file?
         */
        if (!strncasecmp(cp, "FILE", 4)) {
            /*
             * Check for append/overwrite, then open the file.
             */
            if (cp[4] == ':' || cp[4] == '=') {
            log_control.log_entries[i].lfu_fopen_mode =
                (cp[4] == ':') ? "a+F" : "wF";
            old_umask = umask(077);
            f = fopen(&cp[5],
                log_control.log_entries[i].lfu_fopen_mode);
            umask(old_umask);
            if (f) {
                            char rotate_kw[128];

                log_control.log_entries[i].lfu_filep = f;
                log_control.log_entries[i].log_type = K_LOG_FILE;
                log_control.log_entries[i].lfu_fname = &cp[5];
                log_control.log_entries[i].lfu_rotate_period =
                K_LOG_DEF_FILE_ROTATE_PERIOD;
                log_control.log_entries[i].lfu_rotate_versions =
                K_LOG_DEF_FILE_ROTATE_VERSIONS;
                log_control.log_entries[i].lfu_last_rotated =
                time(0);

            /*
             * Now parse for ename_"rotate" = {
             *  period = XXX
             *  versions = 10
             * }
             */
                if (strlen(ename) + strlen("_rotate") <
                sizeof (rotate_kw)) {

                    char *time;
                    krb5_deltat dt;
                    int vers;

                    strcpy(rotate_kw, ename);
                    strcat(rotate_kw, "_rotate");

                    if (!profile_get_string(kcontext->profile,
                        "logging", rotate_kw, "period",
                    NULL, &time)) {

                    if (time != NULL) {
                        if (!krb5_string_to_deltat(time,
                        &dt)) {
            log_control.log_entries[i].lfu_rotate_period =
                            (time_t) dt;
                        }
                        free(time);
                    }
                    }

                    if (!profile_get_integer(
                    kcontext->profile, "logging",
                    rotate_kw, "versions",
                    K_LOG_DEF_FILE_ROTATE_VERSIONS,
                    &vers)) {
            log_control.log_entries[i].lfu_rotate_versions = vers;
                    }

               }
            } else {
                fprintf(stderr, gettext("Couldn't open log file %s: %s\n"),
                    &cp[5], error_message(errno));
                continue;
            }
            }
        }
#ifdef  HAVE_SYSLOG
        /*
         * Is this a syslog?
         */
        else if (!strncasecmp(cp, "SYSLOG", 6)) {
            error = 0;
            log_control.log_entries[i].lsu_facility = LOG_AUTH;
            log_control.log_entries[i].lsu_severity = LOG_ERR;
            /*
             * Is there a severify specified?
             */
            if (cp[6] == ':') {
            /*
             * Find the end of the severity.
             */
            cp2 = strchr(&cp[7], ':');
            if (cp2) {
                savec = *cp2;
                *cp2 = '\0';
                cp2++;
            }

            /*
             * Match a severity.
             */
            if (!strcasecmp(&cp[7], "ERR")) {
                log_control.log_entries[i].lsu_severity = LOG_ERR;
            }
#ifdef  LOG_EMERG
            else if (!strcasecmp(&cp[7], "EMERG")) {
                log_control.log_entries[i].lsu_severity =
                LOG_EMERG;
            }
#endif  /* LOG_EMERG */
#ifdef  LOG_ALERT
            else if (!strcasecmp(&cp[7], "ALERT")) {
                log_control.log_entries[i].lsu_severity =
                LOG_ALERT;
            }
#endif  /* LOG_ALERT */
#ifdef  LOG_CRIT
            else if (!strcasecmp(&cp[7], "CRIT")) {
                log_control.log_entries[i].lsu_severity = LOG_CRIT;
            }
#endif  /* LOG_CRIT */
#ifdef  LOG_WARNING
            else if (!strcasecmp(&cp[7], "WARNING")) {
                log_control.log_entries[i].lsu_severity =
                LOG_WARNING;
            }
#endif  /* LOG_WARNING */
#ifdef  LOG_NOTICE
            else if (!strcasecmp(&cp[7], "NOTICE")) {
                log_control.log_entries[i].lsu_severity =
                LOG_NOTICE;
            }
#endif  /* LOG_NOTICE */
#ifdef  LOG_INFO
            else if (!strcasecmp(&cp[7], "INFO")) {
                log_control.log_entries[i].lsu_severity = LOG_INFO;
            }
#endif  /* LOG_INFO */
#ifdef  LOG_DEBUG
            else if (!strcasecmp(&cp[7], "DEBUG")) {
                log_control.log_entries[i].lsu_severity =
                LOG_DEBUG;
            }
#endif  /* LOG_DEBUG */
            else
                error = 1;

            /*
             * If there is a facility present, then parse that.
             */
            if (cp2) {
                if (!strcasecmp(cp2, "AUTH")) {
                log_control.log_entries[i].lsu_facility = LOG_AUTH;
                }
                else if (!strcasecmp(cp2, "KERN")) {
                log_control.log_entries[i].lsu_facility = LOG_KERN;
                }
                else if (!strcasecmp(cp2, "USER")) {
                log_control.log_entries[i].lsu_facility = LOG_USER;
                }
                else if (!strcasecmp(cp2, "MAIL")) {
                log_control.log_entries[i].lsu_facility = LOG_MAIL;
                }
                else if (!strcasecmp(cp2, "DAEMON")) {
                log_control.log_entries[i].lsu_facility = LOG_DAEMON;
                }
                else if (!strcasecmp(cp2, "LPR")) {
                log_control.log_entries[i].lsu_facility = LOG_LPR;
                }
                else if (!strcasecmp(cp2, "NEWS")) {
                log_control.log_entries[i].lsu_facility = LOG_NEWS;
                }
                else if (!strcasecmp(cp2, "UUCP")) {
                log_control.log_entries[i].lsu_facility = LOG_UUCP;
                }
                else if (!strcasecmp(cp2, "CRON")) {
                log_control.log_entries[i].lsu_facility = LOG_CRON;
                }
                else if (!strcasecmp(cp2, "AUDIT")) {
                log_control.log_entries[i].lsu_facility = LOG_AUDIT;
                }
                else if (!strcasecmp(cp2, "LOCAL0")) {
                log_control.log_entries[i].lsu_facility = LOG_LOCAL0;
                }
                else if (!strcasecmp(cp2, "LOCAL1")) {
                log_control.log_entries[i].lsu_facility = LOG_LOCAL1;
                }
                else if (!strcasecmp(cp2, "LOCAL2")) {
                log_control.log_entries[i].lsu_facility = LOG_LOCAL2;
                }
                else if (!strcasecmp(cp2, "LOCAL3")) {
                log_control.log_entries[i].lsu_facility = LOG_LOCAL3;
                }
                else if (!strcasecmp(cp2, "LOCAL4")) {
                log_control.log_entries[i].lsu_facility = LOG_LOCAL4;
                }
                else if (!strcasecmp(cp2, "LOCAL5")) {
                log_control.log_entries[i].lsu_facility = LOG_LOCAL5;
                }
                else if (!strcasecmp(cp2, "LOCAL6")) {
                log_control.log_entries[i].lsu_facility = LOG_LOCAL6;
                }
                else if (!strcasecmp(cp2, "LOCAL7")) {
                log_control.log_entries[i].lsu_facility = LOG_LOCAL7;
                }
                cp2--;
                *cp2 = savec;
            }
            }
            if (!error) {
            log_control.log_entries[i].log_type = K_LOG_SYSLOG;
            do_openlog = 1;
            log_facility = log_control.log_entries[i].lsu_facility;
            }
        }
#endif  /* HAVE_SYSLOG */
        /*
         * Is this a standard error specification?
         */
        else if (!strcasecmp(cp, "STDERR")) {
            log_control.log_entries[i].lfu_filep =
            fdopen(fileno(stderr), "a+F");
            if (log_control.log_entries[i].lfu_filep) {
            log_control.log_entries[i].log_type = K_LOG_STDERR;
            log_control.log_entries[i].lfu_fname =
                "standard error";
            }
        }
        /*
         * Is this a specification of the console?
         */
        else if (!strcasecmp(cp, "CONSOLE")) {
            log_control.log_entries[i].ldu_filep =
            CONSOLE_OPEN("a+F");
            if (log_control.log_entries[i].ldu_filep) {
            log_control.log_entries[i].log_type = K_LOG_CONSOLE;
            log_control.log_entries[i].ldu_devname = "console";
            }
        }
        /*
         * Is this a specification of a device?
         */
        else if (!strncasecmp(cp, "DEVICE", 6)) {
            /*
             * We handle devices very similarly to files.
             */
            if (cp[6] == '=') {
            log_control.log_entries[i].ldu_filep =
                DEVICE_OPEN(&cp[7], "wF");
            if (log_control.log_entries[i].ldu_filep) {
                log_control.log_entries[i].log_type = K_LOG_DEVICE;
                log_control.log_entries[i].ldu_devname = &cp[7];
            }
            }
        }
        /*
         * See if we successfully parsed this specification.
         */
        if (log_control.log_entries[i].log_type == K_LOG_NONE) {
            fprintf(stderr, krb5_log_error_table(LSPEC_PARSE_ERR_1), whoami, cp);
            fprintf(stderr, krb5_log_error_table(LSPEC_PARSE_ERR_2), whoami);
        }
        else
            ngood++;
        }
    }
    /*
     * If we didn't find anything, then free our lists.
     */
    if (ngood == 0) {
        for (i=0; i<log_control.log_nentries; i++)
        free(logging_specs[i]);
    }
    free(logging_specs);
    }
    /*
     * If we didn't find anything, go for the default which is to log to
     * the system log.
     */
    if (ngood == 0) {
    if (log_control.log_entries)
        free(log_control.log_entries);
    log_control.log_entries = &def_log_entry;
    log_control.log_entries->log_type = K_LOG_SYSLOG;
    log_control.log_entries->log_2free = (krb5_pointer) NULL;
    log_facility = log_control.log_entries->lsu_facility = LOG_AUTH;
    log_control.log_entries->lsu_severity = LOG_ERR;
    do_openlog = 1;
    log_control.log_nentries = 1;
    }
    if (log_control.log_nentries) {
    log_control.log_whoami = (char *) malloc(strlen(whoami)+1);
    if (log_control.log_whoami)
        strcpy(log_control.log_whoami, whoami);

    log_control.log_hostname = (char *) malloc(MAXHOSTNAMELEN + 1);
    if (log_control.log_hostname) {
        gethostname(log_control.log_hostname, MAXHOSTNAMELEN);
        log_control.log_hostname[MAXHOSTNAMELEN] = '\0';
    }
#ifdef  HAVE_OPENLOG
    if (do_openlog) {
        openlog(whoami, LOG_NDELAY|LOG_PID, log_facility);
        log_control.log_opened = 1;
    }
#endif /* HAVE_OPENLOG */
    if (do_com_err)
        (void) set_com_err_hook(klog_com_err_proc);
    }
    return((log_control.log_nentries) ? 0 : ENOENT);
}

/*
 * krb5_klog_close()    - Close the logging context and free all data.
 */
void
krb5_klog_close(krb5_context kcontext)
{
    int lindex;
    (void) reset_com_err_hook();
    for (lindex = 0; lindex < log_control.log_nentries; lindex++) {
    switch (log_control.log_entries[lindex].log_type) {
    case K_LOG_FILE:
    case K_LOG_STDERR:
        /*
         * Files/standard error.
         */
        fclose(log_control.log_entries[lindex].lfu_filep);
        break;
    case K_LOG_CONSOLE:
    case K_LOG_DEVICE:
        /*
         * Devices (may need special handling)
         */
        DEVICE_CLOSE(log_control.log_entries[lindex].ldu_filep);
        break;
#ifdef  HAVE_SYSLOG
    case K_LOG_SYSLOG:
        /*
         * System log.
         */
        break;
#endif  /* HAVE_SYSLOG */
    default:
        break;
    }
    if (log_control.log_entries[lindex].log_2free)
        free(log_control.log_entries[lindex].log_2free);
    }
    if (log_control.log_entries != &def_log_entry)
    free(log_control.log_entries);
    log_control.log_entries = (struct log_entry *) NULL;
    log_control.log_nentries = 0;
    if (log_control.log_whoami)
    free(log_control.log_whoami);
    log_control.log_whoami = (char *) NULL;
    if (log_control.log_hostname)
    free(log_control.log_hostname);
    log_control.log_hostname = (char *) NULL;
#ifdef  HAVE_CLOSELOG
    if (log_control.log_opened)
    closelog();
#endif  /* HAVE_CLOSELOG */
}

/*
 * severity2string()    - Convert a severity to a string.
 */
static const char *
severity2string(int severity)
{
    int s;
    const char *ss;

    s = severity & LOG_PRIMASK;
    ss = krb5_log_error_table(LOG_UFO_STRING);
    switch (s) {
#ifdef  LOG_EMERG
    case LOG_EMERG:
    ss = krb5_log_error_table(LOG_EMERG_STRING);
    break;
#endif  /* LOG_EMERG */
#ifdef  LOG_ALERT
    case LOG_ALERT:
    ss = krb5_log_error_table(LOG_ALERT_STRING);
    break;
#endif  /* LOG_ALERT */
#ifdef  LOG_CRIT
    case LOG_CRIT:
    ss = krb5_log_error_table(LOG_CRIT_STRING);
    break;
#endif  /* LOG_CRIT */
    case LOG_ERR:
    ss = krb5_log_error_table(LOG_ERR_STRING);
    break;
#ifdef  LOG_WARNING
    case LOG_WARNING:
    ss = krb5_log_error_table(LOG_WARNING_STRING);
    break;
#endif  /* LOG_WARNING */
#ifdef  LOG_NOTICE
    case LOG_NOTICE:
    ss = krb5_log_error_table(LOG_NOTICE_STRING);
    break;
#endif  /* LOG_NOTICE */
#ifdef  LOG_INFO
    case LOG_INFO:
    ss = krb5_log_error_table(LOG_INFO_STRING);
    break;
#endif  /* LOG_INFO */
#ifdef  LOG_DEBUG
    case LOG_DEBUG:
    ss = krb5_log_error_table(LOG_DEBUG_STRING);
    break;
#endif  /* LOG_DEBUG */
    }
    return((char *) ss);
}

/*
 * krb5_klog_syslog()   - Simulate the calling sequence of syslog(3), while
 *            also performing the logging redirection as specified
 *            by krb5_klog_init().
 */
static int
klog_vsyslog(int priority, const char *format, va_list arglist)
{
    char    outbuf[KRB5_KLOG_MAX_ERRMSG_SIZE];
    int     lindex;
    char    *syslogp;
    char    *cp;
    time_t  now;
#ifdef  HAVE_STRFTIME
    size_t  soff;
#endif  /* HAVE_STRFTIME */

    /*
     * Format a syslog-esque message of the format:
     *
     * (verbose form)
     *      <date> <hostname> <id>[<pid>](<priority>): <message>
     *
     * (short form)
     *      <date> <message>
     */
    cp = outbuf;
    (void) time(&now);
#ifdef  HAVE_STRFTIME
    /*
     * Format the date: mon dd hh:mm:ss
     */
    soff = strftime(outbuf, sizeof(outbuf), "%b %d %H:%M:%S", localtime(&now));
    if (soff > 0)
    cp += soff;
    else
    return(-1);
#else   /* HAVE_STRFTIME */
    /*
     * Format the date:
     * We ASSUME here that the output of ctime is of the format:
     *  dow mon dd hh:mm:ss tzs yyyy\n
     *  012345678901234567890123456789
     */
    strncpy(outbuf, ctime(&now) + 4, 15);
    cp += 15;
#endif  /* HAVE_STRFTIME */
#ifdef VERBOSE_LOGS
    sprintf(cp, " %s %s[%ld](%s): ",
        log_control.log_hostname, log_control.log_whoami, (long) getpid(),
        severity2string(priority));
#else
    sprintf(cp, " ");
#endif
    syslogp = &outbuf[strlen(outbuf)];

    /* Now format the actual message */
#ifdef  HAVE_VSNPRINTF
    vsnprintf(syslogp, sizeof(outbuf) - (syslogp - outbuf), format, arglist);
#elif   HAVE_VSPRINTF
    vsprintf(syslogp, format, arglist);
#else   /* HAVE_VSPRINTF */
    sprintf(syslogp, format, ((int *) arglist)[0], ((int *) arglist)[1],
        ((int *) arglist)[2], ((int *) arglist)[3],
        ((int *) arglist)[4], ((int *) arglist)[5]);
#endif  /* HAVE_VSPRINTF */

    /*
     * If the user did not use krb5_klog_init() instead of dropping
     * the request on the floor, syslog it - if it exists
     */
#ifdef HAVE_SYSLOG
    if (log_control.log_nentries == 0) {
    /* Log the message with our header trimmed off */
    syslog(priority, "%s", syslogp);
    }
#endif

    /*
     * Now that we have the message formatted, perform the output to each
     * logging specification.
     */
    for (lindex = 0; lindex < log_control.log_nentries; lindex++) {
    switch (log_control.log_entries[lindex].log_type) {
    case K_LOG_FILE:

        klog_rotate(&log_control.log_entries[lindex]);
        /*FALLTHRU*/
    case K_LOG_STDERR:
        /*
         * Files/standard error.
         */
        if (fprintf(log_control.log_entries[lindex].lfu_filep, "%s\n",
            outbuf) < 0) {
        /* Attempt to report error */
        fprintf(stderr, krb5_log_error_table(LOG_FILE_ERR),
            log_control.log_whoami,
            log_control.log_entries[lindex].lfu_fname);
        }
        else {
        fflush(log_control.log_entries[lindex].lfu_filep);
        }
        break;
    case K_LOG_CONSOLE:
    case K_LOG_DEVICE:
        /*
         * Devices (may need special handling)
         */
        if (DEVICE_PRINT(log_control.log_entries[lindex].ldu_filep,
                 outbuf) < 0) {
        /* Attempt to report error */
        fprintf(stderr, krb5_log_error_table(LOG_DEVICE_ERR),
            log_control.log_whoami,
            log_control.log_entries[lindex].ldu_devname);
        }
        break;
#ifdef  HAVE_SYSLOG
    case K_LOG_SYSLOG:
        /*
         * System log.
         */

        /* Log the message with our header trimmed off */
        syslog(priority, "%s", syslogp);
        break;
#endif /* HAVE_SYSLOG */
    default:
        break;
    }
    }
    return(0);
}

int
krb5_klog_syslog(int priority, const char *format, ...)
{
    int     retval;
    va_list pvar;

    va_start(pvar, format);
    retval = klog_vsyslog(priority, format, pvar);
    va_end(pvar);
    return(retval);
}