/*
 * Copyright (c) 2006 Bjorn Andersson <flex@kryo.se>, Erik Ekman <yarrick@kryo.se>
 *
 * 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.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/stat.h>
#include <arpa/nameser.h>
#ifdef DARWIN
#include <arpa/nameser8_compat.h>
#endif
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <check.h>

#include "common.h"
#include "encoding.h"
#include "dns.h"
#include "read.h"
#include "test.h"
	
START_TEST(test_read_putshort)
{
	unsigned short k;
	unsigned short l;
	char* p;
	int i;

	for (i = 0; i < 65536; i++) {
		p = (char*)&k;
		putshort(&p, i);
		fail_unless(ntohs(k) == i, 
				va_str("Bad value on putshort for %d: %d != %d", 
					i, ntohs(k), i));

		p = (char*)&k;
		readshort(NULL, &p, (short *) &l);
		fail_unless(l == i,
				va_str("Bad value on readshort for %d: %d != %d", 
					i, l, i));
	}
}
END_TEST

START_TEST(test_read_putlong)
{
	uint32_t k;
	uint32_t l;
	char* p;
	int i;
	int j;

	for (i = 0; i < 32; i++) {
		p = (char*)&k;
		j = 0xf << i;

		putlong(&p, j);

		fail_unless(ntohl(k) == j, 
				va_str("Bad value on putlong for %d: %d != %d", i, ntohl(j), j));
		
		p = (char*)&k;
		readlong(NULL, &p, &l);

		fail_unless(l == j,
				va_str("Bad value on readlong for %d: %d != %d", i, l, j));
	}
}
END_TEST

START_TEST(test_read_name)
{
	char emptyloop[] = {
		'A', 'A', 0x81, 0x80, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
		0xc0, 0x0c, 0x00, 0x01, 0x00, 0x01 }; 
	char infloop[] = {
		'A', 'A', 0x81, 0x80, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
		0x01, 'A', 0xc0, 0x0c, 0x00, 0x01, 0x00, 0x01 }; 
	char longname[] = 
		"AA\x81\x80\x00\x01\x00\x00\x00\x00\x00\x00"
		"\x3FzBCDEFGHIJKLMNOPQURSTUVXYZ0123456789abcdefghijklmnopqrstuvxyzAA"
		"\x3FzBCDEFGHIJKLMNOPQURSTUVXYZ0123456789abcdefghijklmnopqrstuvxyzAA"
		"\x3FzBCDEFGHIJKLMNOPQURSTUVXYZ0123456789abcdefghijklmnopqrstuvxyzAA"
		"\x3FzBCDEFGHIJKLMNOPQURSTUVXYZ0123456789abcdefghijklmnopqrstuvxyzAA"
		"\x3FzBCDEFGHIJKLMNOPQURSTUVXYZ0123456789abcdefghijklmnopqrstuvxyzAA"
		"\x3FzBCDEFGHIJKLMNOPQURSTUVXYZ0123456789abcdefghijklmnopqrstuvxyzAA"
		"\x00\x00\x01\x00\x01";
	char onejump[] = 
		"AA\x81\x80\x00\x01\x00\x00\x00\x00\x00\x00"
		"\x02hh\xc0\x15\x00\x01\x00\x01\x05zBCDE\x00";
	char badjump[] = {
		'A', 'A', 0x81, 0x80, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
		0xfe, 0xcc, 0x00, 0x01, 0x00, 0x01 }; 
	char badjump2[] = {
		'A', 'A', 0x81, 0x80, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
		0x02, 'B', 'A', 0xfe, 0xcc, 0x00, 0x01, 0x00, 0x01 }; 
	char *jumper;
	char buf[1024];
	char *data;
	int rv;

	memset(buf, 0, sizeof(buf));
	data = emptyloop + sizeof(HEADER);
	buf[1023] = 'A';
	rv = readname(emptyloop, sizeof(emptyloop), &data, buf, 1023);
	fail_unless(buf[1023] == 'A', NULL);
	
	memset(buf, 0, sizeof(buf));
	data = infloop + sizeof(HEADER);
	buf[4] = '\a';
	rv = readname(infloop, sizeof(infloop), &data, buf, 4);
	fail_unless(buf[4] == '\a', NULL);
	
	memset(buf, 0, sizeof(buf));
	data = longname + sizeof(HEADER);
	buf[256] = '\a';
	rv = readname(longname, sizeof(longname), &data, buf, 256);
	fail_unless(buf[256] == '\a', NULL);

	memset(buf, 0, sizeof(buf));
	data = onejump + sizeof(HEADER);
	rv = readname(onejump, sizeof(onejump), &data, buf, 256);
	fail_unless(rv == 9, NULL);
	
	// These two tests use malloc to cause segfault if jump is executed
	memset(buf, 0, sizeof(buf));
	jumper = malloc(sizeof(badjump));
	if (jumper) {
		memcpy(jumper, badjump, sizeof(badjump));
		data = jumper + sizeof(HEADER);
		rv = readname(jumper, sizeof(badjump), &data, buf, 256);

		fail_unless(rv == 0, NULL);
		fail_unless(buf[0] == 0, NULL);
	}
	free(jumper);
	
	memset(buf, 0, sizeof(buf));
	jumper = malloc(sizeof(badjump2));
	if (jumper) {
		memcpy(jumper, badjump2, sizeof(badjump2));
		data = jumper + sizeof(HEADER);
		rv = readname(jumper, sizeof(badjump2), &data, buf, 256);

		fail_unless(rv == 4, NULL);
		fail_unless(strcmp("BA.", buf) == 0, 
				va_str("buf is not BA: %s", buf));
	}
	free(jumper);
}
END_TEST

TCase *
test_read_create_tests()
{
	TCase *tc;

	tc = tcase_create("Read");
	tcase_set_timeout(tc, 60);
	tcase_add_test(tc, test_read_putshort);
	tcase_add_test(tc, test_read_putlong);
	tcase_add_test(tc, test_read_name);

	return tc;
}