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Man Pages


Manual Reference Pages  -  GETADDRINFO (1)

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NAME

"getaddrinfo" - command-line tool to "getaddrinfo(3)" resolver

CONTENTS

SYNOPSIS

<B>getaddrinfoB> [options...] host service

DESCRIPTION

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.

OPTIONS

--host, -H HOST Hostname to resolve. If not supplied, will use the first positional argument
--service, -S SERVICE Service name or port number to resolve. If not supplied, will use the second positional argument.
-4 Restrict to just AF_INET (IPv4) results
-6 Restrict to just AF_INET6 (IPv6) results
--stream Restrict to just SOCK_STREAM results
--dgram Restrict to just SOCK_DGRAM results
--proto PROTO Restrict to just results of the given IP protocol
--passive Set the AI_PASSIVE hint; results will used to bind() and listen() rather than connect()
--canonical Retrive the canonical name for the requested host
--help Display a help summary and exit

OUTPUT FORMAT

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



AUTHOR

Paul Evans <leonerd@leonerd.org.uk>
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