The API documentation says
QueryRecord wants a fullname where:
fullname
Pointer to the full name of the resource record. Call
DNSServiceConstructFullName to construct the full name
from a service name, a registration type, and a domain
name.
I thought the fullname returned by ResolveReply was
what I wanted, but it looks like I needed hostname.
And I thought DNSServiceContructFullName returned the
same string as the fullname I was using.
Is this a bug in the documentation, or am I
misinterpreting the terminology?
It's a bug in that the documentation should be improved. The
DNSServiceQueryRecord API can be used to query for any type of resource
record. Some of the records will be named after the service name, and
some of the records will be named after the local hostname. It really
depends on what you're querying.
And what is the implication for the other functions
that claim to use "fullname"? (i.e.
DNSServiceRegisterRecord
DNSServiceReconfirmRecord
Do these need the fullname or the hosttarget?
Again, it depends. Sometimes you'll want to register an address record
with a name like "foobar.local." and sometimes you'll want to register
a DNS-SD TXT record with a name like "foobar._http._tcp.local.".
Also, one other question that I've been wondering
about. Is there an elegent way for handling IPv4 and
IPv6 using the Query call? It seems that I have to
know before hand since I have to specify the rrtype.
If I look for the wrong type, my program seems to
block indefinitely. I could query for both, but I
presume most likely, one of them will hang. I could
force a timeout with select, but I'm not sure how long
it should be. If it's too long, the user will
experience a noticable delay, especially since it was
likely that I wouldn't try to resolve until the user
requested it and they are now waiting explicitly for
me to connect them.
You should never block when doing a query. You should always be
prepared for the possibility that the query could go unanswered. When
doing address record queries, you'll need to make to separate calls to
DNSServiceQueryRecord to get the IPv4 and IPv6 addresses of the target
host, and then you should try connecting to each returned IP address
until one of them succeeds.
Best Regards,
-Marc
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