ObjFW  Check-in [d3fb3e902d]

 * @brief Asynchronously resolves the specified host to socket addresses.
 *
 * @param host The host to resolve
 * @param addressFamily The desired socket address family
 * @param delegate The delegate to use for callbacks
 */
- (void)asyncResolveAddressesForHost: (OFString *)host
		       addressFamily: (of_socket_address_family_t)addressFamily
			    delegate: (id <OFDNSResolverHostDelegate>)delegate;

/**
 * @brief Asynchronously resolves the specified host to socket addresses.
 *
 * @param host The host to resolve
 * @param addressFamily The desired socket address family
 * @param runLoopMode The run loop mode in which to resolve
 * @param delegate The delegate to use for callbacks
 */
- (void)asyncResolveAddressesForHost: (OFString *)host
		       addressFamily: (of_socket_address_family_t)addressFamily
			 runLoopMode: (OFRunLoopMode)runLoopMode
			    delegate: (id <OFDNSResolverHostDelegate>)delegate;

/**
 * @brief Synchronously resolves the specified host to socket addresses.
 *
 * @param host The host to resolve
 * @param addressFamily The desired socket address family
 * @return OFData containing several of_socket_address_t
 */
- (OFData *)resolveAddressesForHost: (OFString *)host
		      addressFamily: (of_socket_address_family_t)addressFamily;

/**
 * @brief Closes all sockets and cancels all ongoing queries.
 */
- (void)close;
@end

OF_ASSUME_NONNULL_END

	[self asyncResolveAddressesForHost: host
			     addressFamily: OF_SOCKET_ADDRESS_FAMILY_ANY
			       runLoopMode: OFDefaultRunLoopMode
				  delegate: delegate];
}

- (void)asyncResolveAddressesForHost: (OFString *)host
		       addressFamily: (of_socket_address_family_t)addressFamily
			    delegate: (id <OFDNSResolverHostDelegate>)delegate
{
	[self asyncResolveAddressesForHost: host
			     addressFamily: addressFamily
			       runLoopMode: OFDefaultRunLoopMode
				  delegate: delegate];
}

- (void)asyncResolveAddressesForHost: (OFString *)host
		       addressFamily: (of_socket_address_family_t)addressFamily
			 runLoopMode: (OFRunLoopMode)runLoopMode
			    delegate: (id <OFDNSResolverHostDelegate>)delegate
{
	void *pool = objc_autoreleasePoolPush();
	OFHostAddressResolver *resolver = [[[OFHostAddressResolver alloc]
	    initWithHost: host
	   addressFamily: addressFamily
		resolver: self
		settings: _settings
	     runLoopMode: runLoopMode
		delegate: delegate] autorelease];

	[resolver asyncResolve];

	objc_autoreleasePoolPop(pool);
}

- (OFData *)resolveAddressesForHost: (OFString *)host
		      addressFamily: (of_socket_address_family_t)addressFamily
{
	void *pool = objc_autoreleasePoolPush();
	OFHostAddressResolver *resolver = [[[OFHostAddressResolver alloc]
	    initWithHost: host
	   addressFamily: addressFamily
		resolver: self
		settings: _settings

@class OFMutableArray OF_GENERIC(ObjectType);
@class OFMutableData;
@class OFString;

@interface OFHostAddressResolver: OFObject <OFDNSResolverQueryDelegate>
{
	OFString *_host;
	of_socket_address_family_t _addressFamily;
	OFDNSResolver *_resolver;
	OFDNSResolverSettings *_settings;
	OFRunLoopMode _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
		    settings: (OFDNSResolverSettings *)settings
		 runLoopMode: (nullable OFRunLoopMode)runLoopMode
		    delegate: (nullable id <OFDNSResolverHostDelegate>)delegate;
- (void)asyncResolve;
- (OFData *)resolve;
@end

OF_ASSUME_NONNULL_END

			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]) {
#ifdef OF_HAVE_IPV6
	case OF_DNS_RECORD_TYPE_AAAA:
		if (addressFamily != OF_SOCKET_ADDRESS_FAMILY_IPV6 &&
		    addressFamily != OF_SOCKET_ADDRESS_FAMILY_ANY)
			return false;

		[[OFRunLoop currentRunLoop] addTimer: timer
					     forMode: runLoopMode];
	}
}

@implementation OFHostAddressResolver: OFObject
- (instancetype)initWithHost: (OFString *)host
	       addressFamily: (of_socket_address_family_t)addressFamily
		    resolver: (OFDNSResolver *)resolver
		    settings: (OFDNSResolverSettings *)settings
		 runLoopMode: (OFRunLoopMode)runLoopMode
		    delegate: (id <OFDNSResolverHostDelegate>)delegate
{
	self = [super init];

 *	  OFResolveHostFailedException.h ObjFW/OFResolveHostFailedException.h
 *
 * @brief An exception indicating that resolving a host failed.
 */
@interface OFResolveHostFailedException: OFException
{
	OFString *_host;
	of_socket_address_family_t _addressFamily;
	of_dns_resolver_error_t _error;
}

/**
 * @brief The host which could not be resolved.
 */
@property (readonly, nonatomic) OFString *host;

/**
 * @brief The address family for which the host could not be resolved.
 */
@property (readonly, nonatomic) of_socket_address_family_t addressFamily;

/**
 * @brief The error from the resolver.
 */
@property (readonly, nonatomic) of_dns_resolver_error_t error;

/**
 * @brief Creates a new, autoreleased resolve host failed exception.
 *
 * @param host The host which could not be resolved
 * @param addressFamily The address family for which the host could not be
 *			resolved
 * @param error The error from the resolver
 * @return A new, autoreleased address translation failed exception
 */
+ (instancetype)exceptionWithHost: (OFString *)host
		    addressFamily: (of_socket_address_family_t)addressFamily
			    error: (of_dns_resolver_error_t)error;

/**
 * @brief Initializes an already allocated resolve host failed exception.
 *
 * @param host The host which could not be resolved
 * @param addressFamily The address family for which the host could not be
 *			resolved
 * @param error The error from the resolver
 * @return An initialized address translation failed exception
 */
- (instancetype)initWithHost: (OFString *)host
	       addressFamily: (of_socket_address_family_t)addressFamily
		       error: (of_dns_resolver_error_t)error;
@end

OF_ASSUME_NONNULL_END

#import "OFDNSQueryFailedException.h"
#import "OFString.h"

@implementation OFResolveHostFailedException
@synthesize host = _host, addressFamily = _addressFamily, error = _error;

+ (instancetype)exceptionWithHost: (OFString *)host
		    addressFamily: (of_socket_address_family_t)addressFamily
			    error: (of_dns_resolver_error_t)error
{
	return [[[self alloc] initWithHost: host
			     addressFamily: addressFamily
				     error: error] autorelease];
}

- (instancetype)initWithHost: (OFString *)host
	       addressFamily: (of_socket_address_family_t)addressFamily
		       error: (of_dns_resolver_error_t)error
{
	self = [super init];

	@try {
		_host = [host copy];
		_addressFamily = addressFamily;

	OF_SOCKET_ADDRESS_FAMILY_IPV4,
	/** IPv6 */
	OF_SOCKET_ADDRESS_FAMILY_IPV6,
	/** IPX */
	OF_SOCKET_ADDRESS_FAMILY_IPX,
	/** Any address family */
	OF_SOCKET_ADDRESS_FAMILY_ANY = 255
} of_socket_address_family_t;

#ifndef OF_HAVE_IPV6
struct sockaddr_in6 {
	sa_family_t sin6_family;
	in_port_t sin6_port;
	uint32_t sin6_flowinfo;
	struct in6_addr {

	/*
	 * Even though struct sockaddr contains the family, we need to use our
	 * own family, as we need to support storing an IPv6 address on systems
	 * that don't support IPv6. These may not have AF_INET6 defined and we
	 * can't just define it, as the value is system-dependent and might
	 * clash with an existing value.
	 */
	of_socket_address_family_t family;
	union {
		struct sockaddr sockaddr;
		struct sockaddr_in in;
		struct sockaddr_in6 in6;
		struct sockaddr_ipx ipx;
	} sockaddr;
	socklen_t length;