Re: terminal emulators' processing of escape sequences

[Robert Święcki <robert () swiecki net>]

Hi again,

> 2017-05-17 15:56 GMT+02:00 Daniel Kahn Gillmor <dkg () fifthhorseman 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