[bug-inetutils] Traceroute in inet6-preferred environments.

[Mats Erik Andersson]

Let me suggest a first straightforward change to `traceroute'
that will be useful also for an upcoming IPv6 migration, but
is already now important to protect against "RES_OPTIONS=inet6".

To understand this matter, you could try this invokation

    sudo    RES_OPTIONS=inet6  ./src/traceroute www.google.com

on the present executable.

The failure is due eto the use of gethostbyname(3), which gets
severely confused by AF_INET6 answers.

The submitted patch resolves this calamity by a standard migration
to getaddrinfo(3) and getnameinfo(3). There is no step undertaken
towards IPv6 yet, only a guard against unusual but legitimate system
setups.

Tested on GNU/Linux, OpenBSD, and FreeBSD. The service `traceroute'
is now immune against the above call.


Best regards,
Mats

0001-src-traceroute-Protect-against-resolver-option-inet6.patch
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