[PATCH 0/4] dynamic DNS registration updates

[James Peach]

Hi all,

This patch series alters (hopefully for the better) the behaviour of  
"net ads dns register".

[1/4] dns: Log the DNS error on DNS update failure.

Map DNS error code to messages and print an error if the update is  
unsuccessful.

[2/4] dns updates: Register name.dnsdomain instead of  
gethostbyname(name).

I expect this patch to be somewhat controversial. It's not clear to me  
what the correct way to figure out the client's DNS domain is. On our  
systems, the AD join sets up a realm->DNS mapping in the MIT Kerberos  
config file. This might be different for others.

[3/4] dns: Use writev(2) to send DNS requests in a single TCP segment.

This should be straightforward. We just make Wireshark's life easier.

[4/4] dns updates: Dynamically register a PTR record.

We register a PTR record for out first IPv4 address. When DNS  
registrations get IPv6 support we should also register an IPv6  
address. I've taken basically the simplest approach possible to  
registering PTR records. There's significant room for this to become  
more sophisticated.