/*
 * Copyright (c) 2003-2006 Niels Provos <provos@citi.umich.edu>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 */

#ifdef WIN32
#include <winsock2.h>
#include <windows.h>
#endif

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <sys/types.h>
#include <sys/stat.h>
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#include <sys/queue.h>
#ifndef WIN32
#include <sys/socket.h>
#include <sys/signal.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#endif
#ifdef HAVE_NETINET_IN6_H
#include <netinet/in6.h>
#endif
#include <netdb.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>

#include "event.h"
#include "evdns.h"
#include "log.h"

static int dns_ok = 0;

void
dns_gethostbyname_cb(int result, char type, int count, int ttl,
    void *addresses, void *arg)
{
	dns_ok = 0;

	if (result != DNS_ERR_NONE)
		goto out;

	fprintf(stderr, "type: %d, count: %d, ttl: %d: ", type, count, ttl);

	switch (type) {
	case DNS_IPv6_AAAA: {
#if defined(HAVE_STRUCT_IN6_ADDR) && defined(HAVE_INET_NTOP)
		struct in6_addr *in6_addrs = addresses;
		char buf[INET6_ADDRSTRLEN+1];
		int i;
		/* a resolution that's not valid does not help */
		if (ttl < 0)
			goto out;
		for (i = 0; i < count; ++i) {
			const char *b = inet_ntop(AF_INET6, &in6_addrs[i], buf,sizeof(buf));
			if (b)
				fprintf(stderr, "%s ", b);
			else
				fprintf(stderr, "%s ", strerror(errno));
		}
#endif
		break;
	}
	case DNS_IPv4_A: {
		struct in_addr *in_addrs = addresses;
		int i;
		/* a resolution that's not valid does not help */
		if (ttl < 0)
			goto out;
		for (i = 0; i < count; ++i)
			fprintf(stderr, "%s ", inet_ntoa(in_addrs[i]));
		break;
	}
	case DNS_PTR:
		/* may get at most one PTR */
		if (count != 1)
			goto out;

		fprintf(stderr, "%s ", *(char **)addresses);
		break;
	default:
		goto out;
	}

	dns_ok = type;

out:
	event_loopexit(NULL);
}

void
dns_gethostbyname()
{
	fprintf(stdout, "Simple DNS resolve: ");
	dns_ok = 0;
	evdns_resolve_ipv4("www.monkey.org", 0, dns_gethostbyname_cb, NULL);
	event_dispatch();

	if (dns_ok == DNS_IPv4_A) {
		fprintf(stdout, "OK\n");
	} else {
		fprintf(stdout, "FAILED\n");
		exit(1);
	}
}

void
dns_gethostbyname6()
{
	fprintf(stdout, "IPv6 DNS resolve: ");
	dns_ok = 0;
	evdns_resolve_ipv6("www.ietf.org", 0, dns_gethostbyname_cb, NULL);
	event_dispatch();

	if (dns_ok == DNS_IPv6_AAAA) {
		fprintf(stdout, "OK\n");
	} else {
		fprintf(stdout, "FAILED\n");
		exit(1);
	}
}

void
dns_gethostbyaddr()
{
	struct in_addr in;
	in.s_addr = htonl(0x7f000001ul); /* 127.0.0.1 */
	fprintf(stdout, "Simple reverse DNS resolve: ");
	dns_ok = 0;
	evdns_resolve_reverse(&in, 0, dns_gethostbyname_cb, NULL);
	event_dispatch();

	if (dns_ok == DNS_PTR) {
		fprintf(stdout, "OK\n");
	} else {
		fprintf(stdout, "FAILED\n");
		exit(1);
	}
}

void
dns_suite(void)
{
	evdns_init();
	dns_gethostbyname();
	dns_gethostbyname6();
	dns_gethostbyaddr();

	evdns_shutdown(0);
}