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devel / comp.unix.programmer / ping and hex/octal in ip-address

ping and hex/octal in ip-address

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From: richard....@gmail.com (Richard Harnden)
Newsgroups: comp.unix.programmer
Subject: ping and hex/octal in ip-address
Date: Wed, 2 Aug 2023 15:15:22 +0100
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by: Richard Harnden - Wed, 2 Aug 2023 14:15 UTC

Hi,

Is this a bug ... ?

$ ping 0xa.0xb.0xc.0xd
PING 0xa.0xb.0xc.0xd (10.11.12.13) 56(84) bytes of data.
^C
--- 0xa.0xb.0xc.0xd ping statistics ---
8 packets transmitted, 0 received, 100% packet loss, time 7171ms

$ ping 6.7.010.0x9
PING 6.7.010.0x9 (6.7.8.9) 56(84) bytes of data.
^C
--- 6.7.010.0x9 ping statistics ---
5 packets transmitted, 0 received, 100% packet loss, time 4108ms

.... non decimal in the dot-quad is new to me, anyway.

Re: ping and hex/octal in ip-address

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Subject: Re: ping and hex/octal in ip-address
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by: Scott Lurndal - Wed, 2 Aug 2023 14:49 UTC

Richard Harnden <richard.nospam@gmail.com> writes:
>Hi,
>
>Is this a bug ... ?
>
>$ ping 0xa.0xb.0xc.0xd
>PING 0xa.0xb.0xc.0xd (10.11.12.13) 56(84) bytes of data.
>^C
>--- 0xa.0xb.0xc.0xd ping statistics ---
>8 packets transmitted, 0 received, 100% packet loss, time 7171ms
>
> $ ping 6.7.010.0x9
>PING 6.7.010.0x9 (6.7.8.9) 56(84) bytes of data.
>^C
>--- 6.7.010.0x9 ping statistics ---
>5 packets transmitted, 0 received, 100% packet loss, time 4108ms
>
>... non decimal in the dot-quad is new to me, anyway.

Why would you consider it a bug rather than a feature?

If the ping command uses 'strtoui/strtoul/strtoull' to parse
the argument, it can simply specify '0' as the desired base
and strtoul will detect and accept any supported base (at least
8, 10 and 16).

Re: ping and hex/octal in ip-address

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From: richard....@gmail.com (Richard Harnden)
Newsgroups: comp.unix.programmer
Subject: Re: ping and hex/octal in ip-address
Date: Wed, 2 Aug 2023 16:05:56 +0100
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by: Richard Harnden - Wed, 2 Aug 2023 15:05 UTC

On 02/08/2023 15:49, Scott Lurndal wrote:
> Richard Harnden <richard.nospam@gmail.com> writes:
>> Hi,
>>
>> Is this a bug ... ?
>>
>> $ ping 0xa.0xb.0xc.0xd
>> PING 0xa.0xb.0xc.0xd (10.11.12.13) 56(84) bytes of data.
>> ^C
>> --- 0xa.0xb.0xc.0xd ping statistics ---
>> 8 packets transmitted, 0 received, 100% packet loss, time 7171ms
>>
>> $ ping 6.7.010.0x9
>> PING 6.7.010.0x9 (6.7.8.9) 56(84) bytes of data.
>> ^C
>> --- 6.7.010.0x9 ping statistics ---
>> 5 packets transmitted, 0 received, 100% packet loss, time 4108ms
>>
>> ... non decimal in the dot-quad is new to me, anyway.
>
> Why would you consider it a bug rather than a feature?
>
> If the ping command uses 'strtoui/strtoul/strtoull' to parse
> the argument, it can simply specify '0' as the desired base
> and strtoul will detect and accept any supported base (at least
> 8, 10 and 16).

That seems to be exactly what it's doing, yes.

Not exactly a bug - just something I'd never noticed before.

Re: ping and hex/octal in ip-address

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From: Mutt...@dastardlyhq.com
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Subject: Re: ping and hex/octal in ip-address
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by: Mutt...@dastardlyhq.com - Wed, 2 Aug 2023 15:49 UTC

On Wed, 2 Aug 2023 16:05:56 +0100
Richard Harnden <richard.nospam@gmail.com> wrote:
>On 02/08/2023 15:49, Scott Lurndal wrote:
>> Richard Harnden <richard.nospam@gmail.com> writes:
>>> Hi,
>>>
>>> Is this a bug ... ?
>>>
>>> $ ping 0xa.0xb.0xc.0xd
>>> PING 0xa.0xb.0xc.0xd (10.11.12.13) 56(84) bytes of data.
>>> ^C
>>> --- 0xa.0xb.0xc.0xd ping statistics ---
>>> 8 packets transmitted, 0 received, 100% packet loss, time 7171ms
>>>
>>> $ ping 6.7.010.0x9
>>> PING 6.7.010.0x9 (6.7.8.9) 56(84) bytes of data.
>>> ^C
>>> --- 6.7.010.0x9 ping statistics ---
>>> 5 packets transmitted, 0 received, 100% packet loss, time 4108ms
>>>
>>> ... non decimal in the dot-quad is new to me, anyway.
>>
>> Why would you consider it a bug rather than a feature?
>>
>> If the ping command uses 'strtoui/strtoul/strtoull' to parse
>> the argument, it can simply specify '0' as the desired base
>> and strtoul will detect and accept any supported base (at least
>> 8, 10 and 16).
>
>That seems to be exactly what it's doing, yes.
>
>Not exactly a bug - just something I'd never noticed before.

Didn't know it could do that!

Re: ping and hex/octal in ip-address

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From: lew.pitc...@digitalfreehold.ca (Lew Pitcher)
Newsgroups: comp.unix.programmer
Subject: Re: ping and hex/octal in ip-address
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by: Lew Pitcher - Wed, 2 Aug 2023 16:21 UTC

On Wed, 02 Aug 2023 15:49:06 +0000, Muttley wrote:

> On Wed, 2 Aug 2023 16:05:56 +0100
> Richard Harnden <richard.nospam@gmail.com> wrote:
>>On 02/08/2023 15:49, Scott Lurndal wrote:
>>> Richard Harnden <richard.nospam@gmail.com> writes:
>>>> Hi,
>>>>
>>>> Is this a bug ... ?
>>>>
>>>> $ ping 0xa.0xb.0xc.0xd
>>>> PING 0xa.0xb.0xc.0xd (10.11.12.13) 56(84) bytes of data.
>>>> ^C
>>>> --- 0xa.0xb.0xc.0xd ping statistics ---
>>>> 8 packets transmitted, 0 received, 100% packet loss, time 7171ms
>>>>
>>>> $ ping 6.7.010.0x9
>>>> PING 6.7.010.0x9 (6.7.8.9) 56(84) bytes of data.
>>>> ^C
>>>> --- 6.7.010.0x9 ping statistics ---
>>>> 5 packets transmitted, 0 received, 100% packet loss, time 4108ms
>>>>
>>>> ... non decimal in the dot-quad is new to me, anyway.
>>>
>>> Why would you consider it a bug rather than a feature?
>>>
>>> If the ping command uses 'strtoui/strtoul/strtoull' to parse
>>> the argument, it can simply specify '0' as the desired base
>>> and strtoul will detect and accept any supported base (at least
>>> 8, 10 and 16).
>>
>>That seems to be exactly what it's doing, yes.
>>
>>Not exactly a bug - just something I'd never noticed before.
>
> Didn't know it could do that!

You don't even have to stick with dotted-quad format. Witness:

12:19 $ ping 2130706433
PING 2130706433 (127.0.0.1) 56(84) bytes of data.
64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.025 ms

:-)

--
Lew Pitcher
"In Skills We Trust"

Re: ping and hex/octal in ip-address

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Subject: Re: ping and hex/octal in ip-address
From: guent...@gmail.com (Philip Guenther)
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by: Philip Guenther - Wed, 2 Aug 2023 17:29 UTC

On Wednesday, August 2, 2023 at 9:21:11 AM UTC-7, Lew Pitcher wrote:
> On Wed, 02 Aug 2023 15:49:06 +0000, Muttley wrote:
>
> > On Wed, 2 Aug 2023 16:05:56 +0100
> > Richard Harnden <richard...@gmail.com> wrote:
> >>On 02/08/2023 15:49, Scott Lurndal wrote:
> >>> Richard Harnden <richard...@gmail.com> writes:
> >>>> Hi,
> >>>>
> >>>> Is this a bug ... ?
> >>>>
> >>>> $ ping 0xa.0xb.0xc.0xd
> >>>> PING 0xa.0xb.0xc.0xd (10.11.12.13) 56(84) bytes of data.
> >>>> ^C
> >>>> --- 0xa.0xb.0xc.0xd ping statistics ---
> >>>> 8 packets transmitted, 0 received, 100% packet loss, time 7171ms
> >>>>
> >>>> $ ping 6.7.010.0x9
> >>>> PING 6.7.010.0x9 (6.7.8.9) 56(84) bytes of data.
> >>>> ^C
> >>>> --- 6.7.010.0x9 ping statistics ---
> >>>> 5 packets transmitted, 0 received, 100% packet loss, time 4108ms
> >>>>
> >>>> ... non decimal in the dot-quad is new to me, anyway.
> >>>
> >>> Why would you consider it a bug rather than a feature?
> >>>
> >>> If the ping command uses 'strtoui/strtoul/strtoull' to parse
> >>> the argument, it can simply specify '0' as the desired base
> >>> and strtoul will detect and accept any supported base (at least
> >>> 8, 10 and 16).
> >>
> >>That seems to be exactly what it's doing, yes.
> >>
> >>Not exactly a bug - just something I'd never noticed before.
> >
> > Didn't know it could do that!
> You don't even have to stick with dotted-quad format. Witness:
>
> 12:19 $ ping 2130706433
> PING 2130706433 (127.0.0.1) 56(84) bytes of data.
> 64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.025 ms
>
> :-)

Right: the inet_aton(3) and inet_addr(3) routines for converting textual IPv4 addresses into the 'machine' format did that from the start and the behavior actually ended up being specified in the X/Open XNS and POSIX standards for them.

On the other hand, the newer inet_pton(3) routine which supports both IPv4 and IPv6 is specified to *not* support those formats so whether this wart works for a given program depends on how it was implemented. Indeed, some implementations of ping have switched over to use inet_pton(). <shrug>

Philip Guenther

Subject	Author
ping and hex/octal in ip-address	Richard Harnden
ping and hex/octal in ip-address	Scott Lurndal
ping and hex/octal in ip-address	Richard Harnden
ping and hex/octal in ip-address	Muttley
ping and hex/octal in ip-address	Lew Pitcher
ping and hex/octal in ip-address	Philip Guenther