/* NeoStats - IRC Statistical Services 
** Copyright (c) 1999-2004 Adam Rutter, Justin Hammond
** http://www.neostats.net/
**
**  This program is free software; you can redistribute it and/or modify
**  it under the terms of the GNU General Public License as published by
**  the Free Software Foundation; either version 2 of the License, or
**  (at your option) any later version.
**
**  This program is distributed in the hope that it will be useful,
**  but WITHOUT ANY WARRANTY; without even the implied warranty of
**  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
**  GNU General Public License for more details.
**
**  You should have received a copy of the GNU General Public License
**  along with this program; if not, write to the Free Software
**  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
**  USA
**
** NeoStats CVS Identification
** $Id: check.c 1241 2004-01-14 11:36:37Z Fish $
*/
/*
 * check.c
 * - consistency checks
 */
/*
 *  This file is
 *    Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk>
 *
 *  It is part of adns, which is
 *    Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk>
 *    Copyright (C) 1999-2000 Tony Finch <dot@dotat.at>
 *  
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *  
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *  
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software Foundation,
 *  Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 
 */

#include "internal.h"
#include <stdlib.h>
void adns_checkconsistency(adns_state ads, adns_query qu)
{
	adns__consistency(ads, qu, cc_user);
}

#define DLIST_CHECK(list, nodevar, part, body)					\
  if ((list).head) {								\
    assert(! (list).head->part back);						\
    for ((nodevar)= (list).head; (nodevar); (nodevar)= (nodevar)->part next) {	\
      assert((nodevar)->part next						\
	     ? (nodevar) == (nodevar)->part next->part back			\
	     : (nodevar) == (list).tail);					\
      body									\
    }										\
  }

#define DLIST_ASSERTON(node, nodevar, list, part)				\
  do {										\
    for ((nodevar)= (list).head;						\
	 (nodevar) != (node);							\
	 (nodevar)= (nodevar)->part next) {					\
      assert((nodevar));							\
    }										\
  } while(0)

static void checkc_query_alloc(adns_state ads, adns_query qu)
{
	allocnode *an;

	DLIST_CHECK(qu->allocations, an,, {
		    });
}

static void checkc_query(adns_state ads, adns_query qu)
{
	adns_query child;

	assert(qu->udpnextserver < ads->nservers);
	assert(!(qu->udpsent & (~0UL << ads->nservers)));
	assert(qu->search_pos <= ads->nsearchlist);
	if (qu->parent)
		DLIST_ASSERTON(qu, child, qu->parent->children, siblings.);
}

static void checkc_notcpbuf(adns_state ads)
{
	assert(!ads->tcpsend.used);
	assert(!ads->tcprecv.used);
	assert(!ads->tcprecv_skip);
}

static void checkc_global(adns_state ads)
{
	int i;

	assert(ads->udpsocket >= 0);

	for (i = 0; i < ads->nsortlist; i++)
		assert(!
		       (ads->sortlist[i].base.s_addr & ~ads->sortlist[i].
			mask.s_addr));

	assert(ads->tcpserver >= 0 && ads->tcpserver < ads->nservers);

	switch (ads->tcpstate) {
	case server_connecting:
		assert(ads->tcpsocket >= 0);
		checkc_notcpbuf(ads);
		break;
	case server_disconnected:
	case server_broken:
		assert(ads->tcpsocket == -1);
		checkc_notcpbuf(ads);
		break;
	case server_ok:
		assert(ads->tcpsocket >= 0);
		assert(ads->tcprecv_skip <= ads->tcprecv.used);
		break;
	default:
		assert(!"ads->tcpstate value");
	}

	assert(ads->searchlist || !ads->nsearchlist);
}

static void checkc_queue_udpw(adns_state ads)
{
	adns_query qu;

	DLIST_CHECK(ads->udpw, qu,, {
		    assert(qu->state == query_tosend);
		    assert(qu->retries <= UDPMAXRETRIES);
		    assert(qu->udpsent);
		    assert(!qu->children.head && !qu->children.tail);
		    checkc_query(ads, qu); checkc_query_alloc(ads, qu);});
}

static void checkc_queue_tcpw(adns_state ads)
{
	adns_query qu;

	DLIST_CHECK(ads->tcpw, qu,, {
		    assert(qu->state == query_tcpw);
		    assert(!qu->children.head && !qu->children.tail);
		    assert(qu->retries <= ads->nservers + 1);
		    checkc_query(ads, qu); checkc_query_alloc(ads, qu);});
}

static void checkc_queue_childw(adns_state ads)
{
	adns_query parent, child;

	DLIST_CHECK(ads->childw, parent,, {
		    assert(parent->state == query_childw);
		    assert(parent->children.head);
		    DLIST_CHECK(parent->children, child, siblings., {
				assert(child->parent == parent);
				assert(child->state != query_done);});
		    checkc_query(ads, parent);
		    checkc_query_alloc(ads, parent);});
}

static void checkc_queue_output(adns_state ads)
{
	adns_query qu;

	DLIST_CHECK(ads->output, qu,, {
		    assert(qu->state == query_done);
		    assert(!qu->children.head && !qu->children.tail);
		    assert(!qu->parent);
		    assert(!qu->allocations.head && !qu->allocations.tail);
		    checkc_query(ads, qu);});
}

void adns__consistency(adns_state ads, adns_query qu,
		       consistency_checks cc)
{
	adns_query search;

	switch (cc) {
	case cc_user:
		break;
	case cc_entex:
		if (!(ads->iflags & adns_if_checkc_entex))
			return;
		break;
	case cc_freq:
		if ((ads->iflags & adns_if_checkc_freq) !=
		    adns_if_checkc_freq)
			return;
		break;
	default:
		abort();
	}

	checkc_global(ads);
	checkc_queue_udpw(ads);
	checkc_queue_tcpw(ads);
	checkc_queue_childw(ads);
	checkc_queue_output(ads);

	if (qu) {
		switch (qu->state) {
		case query_tosend:
			DLIST_ASSERTON(qu, search, ads->udpw,);
			break;
		case query_tcpw:
			DLIST_ASSERTON(qu, search, ads->tcpw,);
			break;
		case query_childw:
			DLIST_ASSERTON(qu, search, ads->childw,);
			break;
		case query_done:
			DLIST_ASSERTON(qu, search, ads->output,);
			break;
		default:
			assert(!"specific query state");
		}
	}
}
