ObjFW  Diff

#import "OFDNSResourceRecord.h"
#import "OFDNSResponse.h"
#import "OFRunLoop.h"
#import "OFString.h"

OF_ASSUME_NONNULL_BEGIN

#define OF_DNS_RESOLVER_BUFFER_LENGTH 512

@class OFArray OF_GENERIC(ObjectType);
@class OFDNSResolver;
@class OFDNSResolverContext;
@class OFDNSResolverSettings;
@class OFDate;
@class OFDictionary OF_GENERIC(KeyType, ObjectType);
@class OFMutableDictionary OF_GENERIC(KeyType, ObjectType);
@class OFNumber;
@class OFTCPSocket;
@class OFUDPSocket;

/**
 * @enum of_dns_resolver_error_t OFDNSResolver.h ObjFW/OFDNSResolver.h
 *
 * @brief An enum describing why resolving a host failed.
 */
typedef enum of_dns_resolver_error_t {
	/** An unknown error */
	OF_DNS_RESOLVER_ERROR_UNKNOWN,
	/** The query timed out */
	OF_DNS_RESOLVER_ERROR_TIMEOUT,
	/** The query was canceled */
	OF_DNS_RESOLVER_ERROR_CANCELED,
	/**
	 * No result for the specified host with the specified type and class.
	 *
	 * This is only used in situations where this is an error, e.g. when
	 * trying to connect to a host.
	 */
	OF_DNS_RESOLVER_ERROR_NO_RESULT,
	/** The server considered the query to be malformed */
	OF_DNS_RESOLVER_ERROR_SERVER_INVALID_FORMAT,
	/** The server was unable to process due to an internal error */
	OF_DNS_RESOLVER_ERROR_SERVER_FAILURE,
	/** The server returned an error that the domain does not exist */
	OF_DNS_RESOLVER_ERROR_SERVER_NAME_ERROR,
	/** The server does not have support for the requested query */
	OF_DNS_RESOLVER_ERROR_SERVER_NOT_IMPLEMENTED,
	/** The server refused the query */
	OF_DNS_RESOLVER_ERROR_SERVER_REFUSED,
	/** There was no name server to query */
	OF_DNS_RESOLVER_ERROR_NO_NAME_SERVER
} of_dns_resolver_error_t;

/**
 * @protocol OFDNSResolverQueryDelegate OFDNSResolver.h ObjFW/OFDNSResolver.h
 *
 * @brief A delegate for performed DNS queries.
 */
@protocol OFDNSResolverQueryDelegate <OFObject>

@protocol OFDNSResolverHostDelegate <OFObject>
/**
 * @brief This method is called when a DNS resolver resolved a host to
 *	  addresses.
 *
 * @param resolver The acting resolver
 * @param host The host the resolver resolved
 * @param addresses OFData containing several of_socket_address_t
 * @param exception The exception that occurred during resolving, or nil on
 *		    success
 */
- (void)resolver: (OFDNSResolver *)resolver
  didResolveHost: (OFString *)host
       addresses: (nullable OFData *)addresses
       exception: (nullable id)exception;

@interface OFDNSResolver: OFObject
{
	OFDNSResolverSettings *_settings;
	OFUDPSocket *_IPv4Socket;
#ifdef OF_HAVE_IPV6
	OFUDPSocket *_IPv6Socket;
#endif
	char _buffer[OF_DNS_RESOLVER_BUFFER_LENGTH];
	OFMutableDictionary OF_GENERIC(OFNumber *, OFDNSResolverContext *)
	    *_queries;
	OFMutableDictionary OF_GENERIC(OFTCPSocket *, OFDNSResolverContext *)
	    *_TCPQueries;
}

/**

 */
@property (copy, nonatomic) OFArray OF_GENERIC(OFString *) *searchDomains;

/**
 * @brief The timeout, in seconds, after which the next name server should be
 *	  tried.
 */
@property (nonatomic) of_time_interval_t timeout;

/**
 * @brief The number of attempts before giving up to resolve a host.
 *
 * Trying all name servers once is considered a single attempt.
 */
@property (nonatomic) unsigned int maxAttempts;

@property (nonatomic) bool usesTCP;

/**
 * @brief The interval in seconds in which the config should be reloaded.
 *
 * Setting this to 0 disables config reloading.
 */
@property (nonatomic) of_time_interval_t configReloadInterval;

/**
 * @brief Creates a new, autoreleased OFDNSResolver.
 */
+ (instancetype)resolver;

/**

 * @brief Asynchronously performs the specified query.
 *
 * @param query The query to perform
 * @param runLoopMode The run loop mode in which to resolve
 * @param delegate The delegate to use for callbacks
 */
- (void)asyncPerformQuery: (OFDNSQuery *)query
	      runLoopMode: (of_run_loop_mode_t)runLoopMode
		 delegate: (id <OFDNSResolverQueryDelegate>)delegate;

/**
 * @brief Asynchronously resolves the specified host to socket addresses.
 *
 * @param host The host to resolve
 * @param delegate The delegate to use for callbacks
 */
- (void)asyncResolveAddressesForHost: (OFString *)host
			    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 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: (of_run_loop_mode_t)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