adns

adns is a resolver library for C (and C++) programs, and a collection of useful DNS resolver utilities.
Features:
· It is reasonably easy to use for simple programs which just want to translate names to addresses, look up MX records, etc.
· It can be used in an asynchronous, non-blocking, manner. Many queries can be handled simultaneously.
· Responses are decoded automatically into a natural representation for a C program - there is no need to deal with DNS packet formats.
· Sanity checking (eg, name syntax checking, reverse/forward correspondence, CNAME pointing to CNAME) is performed automatically.
· Time-to-live, CNAME and other similar information is returned in an easy-to-use form, without getting in the way.
· There is no global state in the library; resolver state is an opaque data structure which the client creates explicitly. A program can have several instances of the resolver.
· Errors are reported to the application in a way that distinguishes the various causes of failure properly.
· Understands conventional resolv.conf, but this can overridden by environment variables.
· Flexibility. For example, the application can tell adns to: ignore environment variables (for setuid programs), disable hostname syntax sanity checks to return arbitrary data, override or ignore resolv.conf in favour of supplied configuration, etc.

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