getaddrinfo - command-line tool to getaddrinfo(3) resolver
getaddrinfo [options...] host service
This tool provides a convenient command-line wrapper around the getaddrinfo(3) resolver function.
It will perform a single lookup and print the returned results in a human-readable form.
This is mainly useful when debugging address resolution problems,
because it allows inspection of the getaddrinfo(3) behaviour itself,
outside of any real program that is trying to use it.
Hostname to resolve. If not supplied, will use the first positional argument
Service name or port number to resolve. If not supplied, will use the second positional argument.
Restrict to just AF_INET (IPv4) results
Restrict to just AF_INET6 (IPv6) results
Restrict to just SOCK_STREAM results
Restrict to just SOCK_DGRAM results
Restrict to just results of the given IP protocol
Set the AI_PASSIVE hint; results will used to bind() and listen() rather than connect()
Retrive the canonical name for the requested host
Display a help summary and exit
Each line of output will be given in a form that indicates the four result fields of ai_family,
ai_socktype,
ai_protocol and ai_addr.
The first three are printed in the form of a socket(2) call,
either symbolically or numerically,
and the latter is printed as a plain string following it.
For example
socket(AF_INET , SOCK_STREAM, IPPROTO_TCP) + '127.0.0.1:80'
Paul Evans <leonerd@leonerd.org.uk>
