Resolving bonjour name (MyMac.local.)
Resolving bonjour name (MyMac.local.)
- Subject: Resolving bonjour name (MyMac.local.)
- From: Alexander Hartner <email@hidden>
- Date: Sun, 3 May 2009 12:29:46 +0100
When trying to connect to my website using NSURLConnection as shown
below the application fails rather frequently, as it's not able to
resolve the server name (MyMac.local.). This url address was
discovered previously using bonjour. Usually this issue is resolved by
opening up Safari Bonjour Bookmarks, but this is not really a
solution. What I am looking for is to resolve the host address and
then connect to it consistently.
To reproduce this issue I :
1.) Start the http service on MyMac.local.
2.) Connect to it from another client (Success)
3.) Put MyMac.local. to sleep
4.) Connect to it from another client (Fails - Server asleep - No
problem)
5.) Wake MyMac.local. up
6.) Connect to it from another client (Fails - PROBLEM)
7.) Open up Safari Book Marks to find my service running on
MyMal.local. listed or run "dscacheutil -flushcache"
8.) Connect to it from another client (Success - Problem resolved)
When it's working dumping the dscacheutil (dscacheutil -cachedump -
entries host) shows the following
Working :
Host 05/03/09 12:21:51 05/03/09 12:19:51 0
7 120
Key: h_aliases:polaris.local. ipv4:1 ipv6:1
Key: h_aliases:polaris.local. ipv6:1
Key: h_aliases:polaris.local. ipv4:1
Key: h_name:Polaris.local ipv4:1 ipv6:1
Key: h_name:Polaris.local ipv6:1
Key: h_name:Polaris.local ipv4:1
However once the server has been put to sleep it appears as.
Problem :
Host 05/03/09 13:19:57 05/03/09 12:23:25 2 2
3600 YES
Key: h_name:polaris.local ipv4:1 ipv6:1
Even after waking it back up does not change this. However flushing
the cache also resolve the problem.
I read up on NSNetService's resolve method, but that requires a
service name which I don't have. Once I discover the server I
construct a URL and store this in my configuration. Is there a way to
resolve the name from a URL ?
This is an example client I use to debug this issue.
int main (int argc, const char * argv[])
{
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
NSString * hostAddressString;
if (argc == 2)
{
hostAddressString = [NSString stringWithUTF8String:argv[1]];
}
else
{
hostAddressString = @"http://MyMac.local.:8080";;
}
NSLog(@"Connect to : %@",hostAddressString);
NSURLRequest * request=[NSURLRequest requestWithURL:[NSURL
URLWithString:hostAddressString]
cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0];
NSURLResponse * response;
NSError * error;
NSData * data;
data = [NSURLConnection sendSynchronousRequest:request
returningResponse:&response error:&error];
//NSURLConnection *theConnection=[[NSURLConnection alloc]
initWithRequest:request delegate:self startImmediately:YES];
if (!data)
{
NSLog(@"Pre-connect failed");
}
else
{
NSString * output = [[NSString alloc] initWithData:data
encoding:NSUTF8StringEncoding];
NSLog(output);
}
if (error)
{
NSLog(@"Pre-connect failed : %i %@ %@",[error code],[error
domain],[error localizedDescription]);
}
[pool drain];
return 0;
}
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