Keith Moore wrote:
Well, that is emphatically *NOT* what application developers
do. They do not just observe that it does not work, they try
to work around, e.g. routing messages to a different address,
at a different time, through a third party, or through a
Indeed, correctly coded applications will use a getaddrinfo()
and then a connect() in a loop until succesful.
it's perfectly reasonable to connect to an address without first
doing a DNS lookup.
I think nobody can't help you if you are using hardcoded IP's.
The only case you have an IP without DNS is when you get it
passed from another layer/entity (eg in a FTP from the server).
In any other way if you have multiple targets you can also
try all of those in a loop similar to getaddrinfo().
even when you need to do a DNS lookup,
getaddrinfo() doesn't always do what you need.
Can you identify those so that getaddrinfo() can be expanded
to fix these cases?