//

 //  MYAddressLookup.m

 //  MYNetwork

 //

 //  Created by Jens Alfke on 4/24/09.

 //  Copyright 2009 Jens Alfke. All rights reserved.

 //

 #import "MYAddressLookup.h"

 #import "MYBonjourService.h"

 #import "IPAddress.h"

 #import "ExceptionUtils.h"

 #import "Test.h"

 #import "Logging.h"

 #import <dns_sd.h>

 @interface MYAddressLookup ()

 @property (copy) NSString *hostname;

 @end

 @implementation MYAddressLookup

 - (id) initWithHostname: (NSString*)hostname

 {

     self = [super init];

     if (self != nil) {

         if (!hostname) {

             [self release];

             return nil;

         }

         _hostname = [hostname copy];

         _addresses = [[NSMutableSet alloc] init];

     }

     return self;

 }

 - (id) _initWithBonjourService: (MYBonjourService*)service {

     self = [super init];

     if (self) {

         _service = [service retain];

         _addresses = [[NSMutableSet alloc] init];

     }

     return self;

 }

 - (void) dealloc

 {

     [_hostname release];

     [_addresses release];

     [_service release];

     [super dealloc];

 }

 - (NSString*) description

 {

     return $sprintf(@"%@[%@]", self.class,_hostname);

 }

 @synthesize hostname=_hostname, port=_port, interfaceIndex=_interfaceIndex, addresses=_addresses;

 - (NSTimeInterval) timeToLive {

     return MAX(0.0, _expires - CFAbsoluteTimeGetCurrent());

 }

 - (BOOL) start {

     if (_hostname) {

         return [super start];

     } else {

         // Service doesn't know its hostname yet; wait till it does:

         LogTo(DNS,@"MYAddressLookup requesting hostname of %@ ...", _service);

         Assert(_service);

         return [_service start];

     }

 }

 // Called by my _service's gotResponse method:

 - (void) _serviceGotResponse {

     Assert(_service);

     DNSServiceErrorType err = _service.error;

     if (err) {

         [self cancel];

         self.error = err;

     } else {

         NSString *hostname = _service.hostname;

         UInt16 port = _service.port;

         if (port!=_port || !$equal(hostname,_hostname)) {

             self.hostname = hostname;

             self.port = port;

             if (_hostname)

                 [self start];

         }

     }

 }

 - (void) priv_resolvedAddress: (const struct sockaddr*)sockaddr

                           ttl: (uint32_t)ttl

                         flags: (DNSServiceFlags)flags

 {

     HostAddress *address = [[HostAddress alloc] initWithHostname: _hostname 

                                                         sockaddr: sockaddr

                                                             port: _port];

     if (address) {

         if (flags & kDNSServiceFlagsAdd) {

             LogTo(DNS,@"%@ got %@ [TTL = %u]", self, address, ttl);

             kvAddToSet(self, @"addresses", _addresses, address);

         } else {

             LogTo(DNS,@"%@ lost %@ [TTL = %u]", self, address, ttl);

             kvRemoveFromSet(self, @"addresses", _addresses, address);

         }

         [address release];

     }

     _expires = CFAbsoluteTimeGetCurrent() + ttl;

 }

 static void lookupCallback(DNSServiceRef                    sdRef,

                            DNSServiceFlags                  flags,

                            uint32_t                         interfaceIndex,

                            DNSServiceErrorType              errorCode,

                            const char                       *hostname,

                            const struct sockaddr            *address,

                            uint32_t                         ttl,

                            void                             *context)

 {

     MYAddressLookup *lookup = context;

     @try{

         LogTo(DNS, @"lookupCallback for %s (err=%i)", hostname,errorCode);

         if (errorCode)

             [lookup setError: errorCode];

         else

             [lookup priv_resolvedAddress: address ttl: ttl flags: flags];

     }catchAndReport(@"MYDNSLookup query callback");

     [lookup gotResponse: errorCode];

 }

 - (DNSServiceErrorType) createServiceRef: (DNSServiceRef*)sdRefPtr {

     Assert(_hostname);

     kvSetSet(self, @"addresses", _addresses, nil);

     return DNSServiceGetAddrInfo(sdRefPtr,

                                  kDNSServiceFlagsShareConnection,

                                  _interfaceIndex, 

                                  kDNSServiceProtocol_IPv4,

                                  _hostname.UTF8String,

                                  &lookupCallback, self);

 }

 @end

 TestCase(MYDNSLookup) {

     EnableLogTo(Bonjour,YES);

     EnableLogTo(DNS,YES);

     [NSRunLoop currentRunLoop]; // create runloop

     MYAddressLookup *lookup = [[MYAddressLookup alloc] initWithHostname: @"www.apple.com" port: 80];

     [lookup start];

     [[NSRunLoop currentRunLoop] runUntilDate: [NSDate dateWithTimeIntervalSinceNow: 10]];

     [lookup release];

 }    

 /*

  Copyright (c) 2009, Jens Alfke <jens@mooseyard.com>. All rights reserved.

  Redistribution and use in source and binary forms, with or without modification, are permitted

  provided that the following conditions are met:

  * Redistributions of source code must retain the above copyright notice, this list of conditions

  and the following disclaimer.

  * 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.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR CONTRI-

  BUTORS 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.

  */