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NSStream sockets with bad reverse DNS

Subject: NSStream sockets with bad reverse DNS
From: Samuel Tesla <email@hidden>
Date: Wed, 8 Jun 2005 00:09:44 -0500
Delivered-to: email@hidden
Delivered-to: email@hidden

Hey all,

I ran across a very interesting problem with NSStream.

When I create an NSHost object, it appears to do its best to fill both the address and the names out. If I create it using and IP, it will do reverse DNS lookups. The interesting problem comes up when I create an NSHost from an IP address, but the hostname that reverse DNS finds is not a good one. In that case it gets errors when it tries to get the streams.

I've attached the program I used to generate the following output.

Here's a perfectly good host:

$ host 155.53.1.242
242.1.53.155.in-addr.arpa domain name pointer veal.babymeat.com.
$ host veal.babymeat.com
veal.babymeat.com has address 155.53.1.242
$ ./testnshost 155.53.1.242 7777
2005-06-07 23:51:48.215 testnshost[21836] Testing: 155.53.1.242 7777
2005-06-07 23:51:48.422 testnshost[21836] NSStreamEventOpenCompleted
2005-06-07 23:51:48.423 testnshost[21836] NSStreamEventOpenCompleted
2005-06-07 23:51:48.423 testnshost[21836] NSStreamEventHasSpaceAvailable
2005-06-07 23:51:48.543 testnshost[21836] NSStreamEventHasBytesAvailable

Here's a bad host:

$ host 212.13.197.5 5.197.13.212.in-addr.arpa domain name pointer sneaky.geekstuff.co.uk. $ host sneaky.geekstuff.co.uk. Host sneaky.geekstuff.co.uk not found: 3(NXDOMAIN) $ ./testnshost 212.13.197.5 7773 2005-06-07 23:52:06.032 testnshost[21838] Testing: 212.13.197.5 7773 2005-06-07 23:52:06.051 testnshost[21838] NSStreamEventErrorOccurred: Error NSUnknownErrorDomain 7 2005-06-07 23:52:06.053 testnshost[21838] NSStreamEventErrorOccurred: Error NSUnknownErrorDomain 7

Anybody have an idea about this? It seems that NSStream is using [host name] instead of [host address]...but that seems odd.

Thanks,
Samuel

Attachment: testnshost.m
Description: Binary data

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