/*
**  L2 - OSSP Logging Library
**  Copyright (c) 2001 The OSSP Project (http://www.ossp.org/)
**  Copyright (c) 2001 Cable & Wireless Deutschland (http://www.cw.com/de/)
**
**  This file is part of OSSP L2, a flexible logging library which
**  can be found at http://www.ossp.org/pkg/l2/.
**
**  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.
**
**  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 THE AUTHORS AND COPYRIGHT HOLDERS AND THEIR
**  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.
**
**  l2_ch_syslog.c: syslog(3) channel implementation
*/

#include "l2.h"
#include "l2_p.h"

#include <syslog.h>

/* declare private channel configuration */
typedef struct {
    int iEtwas;
    char *pszNada;
} l2_ch_syslog_t;

/* create channel */
static int hook_create(l2_context_t *ctx)
{
    l2_ch_syslog_t *cfg;

    /* allocate private channel configuration */

    /* initialize configuration with reasonable defaults */

    /* link private channel configuration into channel context */

    return L2_OK;
}

/* configure channel */
static int hook_configure(l2_context_t *ctx, const char *fmt, va_list ap)
{
    l2_ch_syslog_t *cfg;
    l2_param_t pa[3]; 
    l2_result_t rv;

    /* parameter checks */
    if ((cfg = (l2_ch_syslog_t *)ctx->vp) == NULL)
        return L2_ERROR;

    /* feed and call generic parameter parsing engine */
    L2_PARAM_SET(pa[0], iEtwas,   CHARPTR, &cfg->iEtwas);
    L2_PARAM_SET(pa[1], pszNada, INT,     &cfg->pszNada);
    L2_PARAM_END(pa[2]);
    rv = l2_channel_setparams(pa, fmt, ap);

    return rv;
}

/* open channel */
static int hook_open(l2_context_t *ctx, l2_channel_t *downstream)
{
    l2_ch_syslog_t *cfg;

    /* parameter checks */
    if ((cfg = (l2_ch_syslog_t *)ctx->vp) == NULL)
        return L2_ERROR;
    if (cfg->pszNada == NULL) /* ATTENTION */
        return L2_ERROR;

    /* open channel syslog */

    /* optionally open downstream channel, too */
    if (downstream != NULL)
        if (l2_channel_open(downstream) == L2_ERROR)
            return L2_ERROR;

    return L2_OK;
}

/* write to channel */
static int hook_write(l2_context_t *ctx, l2_channel_t *downstream, 
                      const char *buf, size_t buf_size)
{
    l2_ch_syslog_t *cfg;

    /* parameter checks */
    if ((cfg = (l2_ch_syslog_t *)ctx->vp) == NULL)
        return L2_ERROR;

    /* write message to channel syslog */

    /* optionally write to downstream channel, too */
    if (downstream != NULL)
        if (l2_channel_write(downstream, buf, buf_size) == L2_ERROR)
            return L2_ERROR;

    return L2_OK;
}

/* flush channel */
static int hook_flush(l2_context_t *ctx, l2_channel_t *downstream)
{
    l2_ch_syslog_t *cfg;

    /* parameter checks */
    if ((cfg = (l2_ch_syslog_t *)ctx->vp) == NULL)
        return L2_ERROR;

    /* optionally flush downstream channel, too */
    if (downstream != NULL)
        if (l2_channel_flush(downstream) == L2_ERROR)
            return L2_ERROR;

    return L2_OK;
}

/* close channel */
static int hook_close(l2_context_t *ctx, l2_channel_t *downstream)
{
    l2_ch_syslog_t *cfg;

    /* optionally close downstream channel, too */
    if (downstream != NULL)
        if (l2_channel_close(downstream) == L2_ERROR)
            return L2_ERROR;

    /* parameter checks */
    if ((cfg = (l2_ch_syslog_t *)ctx->vp) == NULL)
        return L2_ERROR;

    /* close channel syslog */

    return L2_OK;
}

/* destroy channel */
static int hook_destroy(l2_context_t *ctx)
{
    /* parameter checks */
    if (ctx->vp == NULL) 
        return L2_ERROR;

    /* destroy channel configuration */
    free(ctx->vp);

    return L2_OK;
}

/* exported channel handler structure */
l2_handler_t l2_handler_syslog = {
    hook_create,
    hook_configure,
    hook_open,
    hook_write,
    hook_flush,
    hook_close,
    hook_destroy
};