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Date: Thu, 18 May 2017 02:05:24 +0200
From: Robert Święcki <robert@...ecki.net>
To: Daniel Kahn Gillmor <dkg@...thhorseman.net>
Cc: oss-security@...ts.openwall.com, "Jason A. Donenfeld" <Jason@...c4.com>, 
	rxvt-unicode@...ts.schmorp.de, rxvt@...morp.de
Subject: Re: terminal emulators' processing of escape sequences

Hi again,

> 2017-05-17 15:56 GMT+02:00 Daniel Kahn Gillmor <dkg@...thhorseman.net>:
>>> Please consider the following example:
>>>
>>> $ tail -n1 /etc/hosts | xxd
>>> 00000000: 3132 372e 302e 302e 3309 1b47 513b 205a  127.0.0.3..GQ; Z
>>> 00000010: 5a5a 0a                                  ZZ.
>>> $ ping ZZZ
>>> PING ; (127.0.0.3) 56(84) bytes of data.
>>> ^[G0
>>> 64 bytes from ; (127.0.0.3): icmp_seq=1 ttl=64 time=0.039 ms
>>> ^[G0
>>> 64 bytes from ; (127.0.0.3): icmp_seq=2 ttl=64 time=0.032 ms
>>> ^[G0
>>> ^C
>>> --- ; ping statistics ---
>>> 2 packets transmitted, 2 received, 0% packet loss, time 1014ms
>>> rtt min/avg/max/mdev = 0.032/0.035/0.039/0.006 ms
>>> ^[G0
>>> $ 0
>>> bash: 0: command not found
>>
>> what version of ping are you using?  I was unable to replicate this with
>> either the debian iputils-ping package version 3:20161105-1, or with
>> debian inetutils-ping package version 2:1.9.4-2+b1.  neither of them seem to
>> do a getnameinfo() at all if it is initially supplied with an IP
>> address.
>
> Works for me with the following:
>
> Ubuntu 17.04's iputils-ping 3:20161105-1ubuntu2
> Fedora 25's iputils-20161105-1.fc25.x86_64

I believe you should try with

$ ping ZZZ

With

$ ping 127.0.0.3

it doesn't do reverse lookups at all (as you'd pointed out).

-- 
Robert Święcki

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