net/adns 1.6.0 NetBSD

adns is a DNS resolver library and a collection of utilities that use the library. The adns library has the following 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. ...and more!