smbsrv/smbd/smbd_syslog.c

	smbd_syslog.c revision b819cea2f73f98c5662230cc9affc8cc84f77fcf
/*
 * This file and its contents are supplied under the terms of the
 * Common Development and Distribution License ("CDDL"), version 1.0.
 * You may only use this file in accordance with the terms of version
 * 1.0 of the CDDL.
 *
 * A full copy of the text of the CDDL should have accompanied this
 * source.  A copy of the CDDL is also available via the Internet at
 * http://www.illumos.org/license/CDDL.
 */

/*
 * Copyright 2014 Nexenta Systems, Inc.  All rights reserved.
 */

#include <stdio.h>
#include <stdarg.h>
#include <errno.h>
#include <string.h>
#include <syslog.h>

#include <smbsrv/smbinfo.h>
#include <smbsrv/smb_ioctl.h>
#include "smbd.h"

#define CBUFSIZ 26  /* ctime(3c) */

static const char *pri_name[LOG_DEBUG+1] = {
    "emerg", "alert", "crit", "err", "warning", "notice", "info", "debug"
};

static void
smb_svc_log(int pri, const char *fmt, va_list ap)
{
    static time_t prev_ts;
    char fbuf[SMBD_LOG_MSGSIZE];
    char cbuf[CBUFSIZ];
    char *newfmt;
    time_t ts;
    int save_errno = errno;

    pri &= LOG_PRIMASK;
    if (smbd.s_debug == 0 && pri == LOG_DEBUG)
        return;

    ts = time(NULL);
    if (prev_ts != ts) {
        prev_ts = ts;
        /* NB: cbuf has \n */
        (void) fprintf(stdout, "@ %s",
            ctime_r(&ts, cbuf, sizeof (cbuf)));
    }

    newfmt = smb_syslog_fmt_m(fbuf, sizeof (fbuf), fmt, save_errno);

    flockfile(stdout);
    (void) fprintf(stdout, "smbd.%s: ", pri_name[pri]);
    /* LINTED E_SEC_PRINTF_VAR_FMT */
    (void) vfprintf(stdout, newfmt, ap);
    (void) fprintf(stdout, "\n");
    funlockfile(stdout);

    (void) fflush(stdout);
}

/*
 * Provide a replacement for libsmb:smb_vsyslog() that prints messages
 * both to the normal sysloc(3c), and to stdout, which ends up in:
 *  /var/svc/log/network-smb-server:default.log
 * It's much easier to follow debug messages in the service log.
 */
void
smb_vsyslog(int pri, const char *fmt, va_list ap)
{
    va_list tap;

    va_copy(tap, ap);
    smb_svc_log(pri, fmt, tap);
    va_end(tap);

    vsyslog(pri, fmt, ap);
}

/*
 * An override for libsmb:smb_trace().  As the comment there says:
 *
 * This function is designed to be used with dtrace, i.e. see:
 * usr/src/cmd/smbsrv/dtrace/smbd-all.d
 *
 * Outside of dtrace, the messages passed to this function usually
 * lack sufficient context to be useful, so don't log them.
 * However, if you insist, set debug >= 3 and this will log them.
 */
void
smb_trace(const char *s)
{
    if (smbd.s_debug >= 3)
        (void) fprintf(stdout, "smbd.trace: %s\n", s);
}