xdasd_event.c

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/*----------------------------------------------------------------------------
 * Copyright (c) 2006, Novell, Inc.
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are 
 * met:
 * 
 *     * Redistributions of source code must retain the above copyright 
 *       notice, this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of the Novell nor the names of its contributors 
 *       may be used to endorse or promote products derived from this 
 *       software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 THE COPYRIGHT OWNER 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.
 *--------------------------------------------------------------------------*/

#include <xdasd.h>

#include "xdasd_log.h"
#include "xdasd_event.h"
#include "xdasd_parse.h"
#include "xdasd_logger.h"
#include "xdasd_trigger.h"
#include "xdasd_filter.h"

#include <stdlib.h>
#include <stddef.h>

static int ev_check(int * minorp, Parsed * parsed, int onlycheck)
{
   switch(xdasd_filter_check(parsed, onlycheck))
   {
      case 1:  return XDAS_S_COMPLETE;
      case 0:  return XDAS_S_NO_AUDIT;
      case -1: return (*minorp = OXDAS_MS_OUT_OF_MEMORY), XDAS_S_FAILURE;
      case -2: return XDAS_S_NO_DECISION_YET;
   }
   return (*minorp = OXDAS_MS_UNKNOWN_ERROR), XDAS_S_FAILURE;
}

static int ev_parse(int * minorp, int impflag, 
      size_t msgsz, const char * msg, Parsed ** parsedp)
{
   xdasd_log(10, "ev_parse: [%.*s]\n", msgsz, msg);
   switch(xdasd_parse_message(impflag? PMF_IMPORTED: 0, msgsz, msg, parsedp))
   {
      case 0:  return XDAS_S_COMPLETE;
      case -1: return (*minorp = OXDAS_MS_OUT_OF_MEMORY), XDAS_S_FAILURE;
      case -2: return XDAS_S_INCOMPLETE_RECORD;
   }
   return (*minorp = OXDAS_MS_UNKNOWN_ERROR), XDAS_S_FAILURE;
}

static int ev_logger_append(Parsed * parsed)
{
   if (xdasd_logger_append(parsed) != 0)
      return XDAS_S_STORAGE_FAILURE;
   return XDAS_S_COMPLETE;
}

static int xdasd_event_check(int * minorp, int impflag, 
      size_t msgsz, const char * msg)
{
   int err;
   Parsed * parsed;

   /* parse an message */
   if ((err = ev_parse(minorp, impflag, msgsz, msg, &parsed)) != 0)
      return err;

   /* check and free parsed message */
   err = ev_check(minorp, parsed, 1);
   xdasd_parse_free(parsed);
   return err;
}

static int xdasd_event_check_and_submit(int * minorp, int impflag, 
      size_t msgsz, const char * msg)
{
   int err;
   Parsed * parsed;

   if ((err = ev_parse(minorp, impflag, msgsz, msg, &parsed)) != 0)
      return err;

   /* check & submit a parsed message, then free it */
   if ((err = ev_check(minorp, parsed, 0)) == XDAS_S_COMPLETE
         || err == XDAS_S_NO_DECISION_YET)
   {
/*    if (parsed->severity)
         if (xdasd_alarm_append(parsed) != 0)
            xdasd_log(0, "event: Unable to execute alarm for message:\n[ %s ]\n", 
                  parsed->parsed[0]);
*/
      if (parsed->triggers.head != 0)
         if (xdasd_trigger_append(parsed) != 0)
            xdasd_log(0, "event: Unable to execute script for message:\n[ %s ].\n", 
                  parsed->parsed[0]);

      if (parsed->flags & PMF_LOG)
         err = ev_logger_append(parsed);
   }
   xdasd_parse_free(parsed);

   /* Since (from the client perspective) we've already either discarded, 
      or committed the record, we never return NO_AUDIT, or NO_DECISION 
      codes from this routine. */
   if (err == XDAS_S_NO_AUDIT || err == XDAS_S_NO_DECISION_YET)
      err = XDAS_S_COMPLETE;

   return err;
}

/*--------------------------------------------------------------------------*/

int xdasd_event_process(int * minorp, xdas_buffer req, xdas_buffer * rspp)
{
   static int(*handler_table[])(int *, int, size_t, const char *) = 
   { 
      xdasd_event_check,               /* sub-function 0 */
      xdasd_event_check_and_submit,    /* sub-function 1 */
      xdasd_event_check_and_submit     /* sub-function 2 */
   };

   unsigned reqsfn;
   int impflag;
   size_t msgsz, reqsz = req->end - req->curpos;

   (void)rspp; /* extended response data not provided by this function */

   if (reqsz < 12 || (reqsfn = xdas_buffer_get_uint32(req)) 
         >= xdas_elemcount(handler_table))
   {
      const char * errmsg = reqsz < 12? 
            "request buffer too small": "unknown function requested";
      xdasd_log(1, "xdasd_event_process: Protocol error - %s.\n", errmsg);
      return (*minorp = OXDAS_MS_PROTOCOL), XDAS_S_FAILURE;
   }

   impflag = (int)xdas_buffer_get_uint32(req);
   msgsz = xdas_buffer_get_uint32(req);

   return handler_table[reqsfn](minorp, impflag, msgsz, req->curpos);
}