ObjFW  Check-in [355da9743c]

		    responseWithDomainName: context->_query.domainName
			     answerRecords: answerRecords
			  authorityRecords: authorityRecords
			 additionalRecords: additionalRecords];
	} @catch (id e) {
		exception = e;
	}

	if (exception != nil)
		response = nil;

	if ([context->_delegate respondsToSelector:
	    @selector(resolver:didPerformQuery:response:exception:)])
		[context->_delegate resolver: self
			     didPerformQuery: context->_query
				    response: response
				   exception: exception];

{
	OFString *_host;
	of_socket_address_family_t _addressFamily;
	OFDNSResolver *_resolver;
	OFDNSResolverSettings *_settings;
	of_run_loop_mode_t _Nullable _runLoopMode;
	id <OFDNSResolverHostDelegate> _Nullable _delegate;
	bool _isFQDN;
	size_t _searchDomainIndex;
	unsigned int _numExpectedResponses;
	OFMutableData *_addresses;
}

- (instancetype)initWithHost: (OFString *)host
	       addressFamily: (of_socket_address_family_t)addressFamily
		    resolver: (OFDNSResolver *)resolver

 * LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
 * file.
 */

#include "config.h"

#import "OFHostAddressResolver.h"
#import "OFArray.h"
#import "OFDNSResolver.h"
#import "OFDNSResolverSettings.h"
#import "OFData.h"
#import "OFDate.h"
#import "OFDictionary.h"
#import "OFRunLoop.h"
#import "OFString.h"
#import "OFTimer.h"

#import "OFDNSQueryFailedException.h"
#import "OFInvalidArgumentException.h"
#import "OFInvalidFormatException.h"
#import "OFResolveHostFailedException.h"

@interface OFHostAddressResolverDelegate: OFObject <OFDNSResolverHostDelegate>
{
@public
	bool _done;
	OFData *_addresses;
	id _exception;
}
@end

static const of_run_loop_mode_t resolveRunLoopMode =
    @"of_host_address_resolver_resolve_mode";

static bool
isFQDN(OFString *host, unsigned int minNumberOfDotsInAbsoluteName)
{
	const char *UTF8String;
	size_t length;
	unsigned int dots;

	if ([host hasSuffix: @"."])
		return true;

	UTF8String = host.UTF8String;
	length = host.UTF8StringLength;
	dots = 0;

	for (size_t i = 0; i < length; i++)
		if (UTF8String[i] == '.')
			dots++;

	return (dots >= minNumberOfDotsInAbsoluteName);
}

static bool
addressForRecord(OF_KINDOF(OFDNSResourceRecord *) record,
    const of_socket_address_t **address,
    of_socket_address_family_t addressFamily)
{
	switch ([record recordType]) {

	[_settings release];
	[_runLoopMode release];
	[_delegate release];
	[_addresses release];

	[super dealloc];
}

- (void)sendQueries
{
	OFString *domainName;

	if (!_isFQDN) {
		OFString *searchDomain = [_settings->_searchDomains
		    objectAtIndex: _searchDomainIndex];

		domainName = [OFString stringWithFormat: @"%@.%@",
							 _host, searchDomain];
	} else
		domainName = _host;

#ifdef OF_HAVE_IPV6
	if (_addressFamily == OF_SOCKET_ADDRESS_FAMILY_IPV6 ||
	    _addressFamily == OF_SOCKET_ADDRESS_FAMILY_ANY) {
		OFDNSQuery *query = [OFDNSQuery
		    queryWithDomainName: domainName
			       DNSClass: OF_DNS_CLASS_IN
			     recordType: OF_DNS_RESOURCE_RECORD_TYPE_AAAA];
		_numExpectedResponses++;
		[_resolver asyncPerformQuery: query
				 runLoopMode: _runLoopMode
				    delegate: self];
	}
#endif

	if (_addressFamily == OF_SOCKET_ADDRESS_FAMILY_IPV4 ||
	    _addressFamily == OF_SOCKET_ADDRESS_FAMILY_ANY) {
		OFDNSQuery *query = [OFDNSQuery
		    queryWithDomainName: domainName
			       DNSClass: OF_DNS_CLASS_IN
			     recordType: OF_DNS_RESOURCE_RECORD_TYPE_A];
		_numExpectedResponses++;
		[_resolver asyncPerformQuery: query
				 runLoopMode: _runLoopMode
				    delegate: self];
	}
}

-  (void)resolver: (OFDNSResolver *)resolver
  didPerformQuery: (OFDNSQuery *)query
	 response: (OFDNSResponse *)response
	exception: (id)exception
{
	_numExpectedResponses--;

	if ([exception isKindOfClass: [OFDNSQueryFailedException class]] &&
	    [exception error] == OF_DNS_RESOLVER_ERROR_SERVER_NAME_ERROR &&
	    !_isFQDN && _numExpectedResponses == 0 && _addresses.count == 0 &&


	    _searchDomainIndex + 1 < _settings->_searchDomains.count) {
		_searchDomainIndex++;
		[self sendQueries];

		return;
	}

	for (OF_KINDOF(OFDNSResourceRecord *) record in
	    [response.answerRecords objectForKey: query.domainName]) {
		const of_socket_address_t *address;
		OFDNSQuery *CNAMEQuery;

	[_addresses makeImmutable];

	if ([_delegate respondsToSelector:
	    @selector(resolver:didResolveHost:addresses:exception:)])
		[_delegate resolver: _resolver
		     didResolveHost: _host
			  addresses: (_addresses.count > 0 ? _addresses : nil)


			  exception: (_addresses.count == 0 ? exception : nil)];































}

- (void)asyncResolve
{
	void *pool = objc_autoreleasePoolPush();
	OFArray OF_GENERIC(OFString *) *aliases;

		callDelegateInMode(_runLoopMode, _delegate, _resolver, _host,
		    addresses, exception);

		objc_autoreleasePoolPop(pool);
		return;
	}

	_isFQDN = isFQDN(_host, _settings->_minNumberOfDotsInAbsoluteName);
	_addresses = [[OFMutableData alloc]
	    initWithItemSize: sizeof(of_socket_address_t)];

	[self sendQueries];

	objc_autoreleasePoolPop(pool);
}