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Re: socket.gethostbyaddr( os.environ['REMOTE_ADDR'] error

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  Re: socket.gethostbyaddr( os.environ['REMOTE_ADDR'] error Νικόλαος Κούρας <nikos.kouras@gmail.com> - 2012-01-02 05:25 -0800
    Re: socket.gethostbyaddr( os.environ['REMOTE_ADDR'] error Heiko Wundram <modelnine@modelnine.org> - 2012-01-02 15:00 +0100
      Re: socket.gethostbyaddr( os.environ['REMOTE_ADDR'] error Νικόλαος Κούρας <nikos.kouras@gmail.com> - 2012-01-02 07:29 -0800
        Re: socket.gethostbyaddr( os.environ['REMOTE_ADDR'] error Roy Smith <roy@panix.com> - 2012-01-02 10:47 -0500
          Re: socket.gethostbyaddr( os.environ['REMOTE_ADDR'] error Νικόλαος Κούρας <nikos.kouras@gmail.com> - 2012-01-02 10:17 -0800

#18326 — Re: socket.gethostbyaddr( os.environ['REMOTE_ADDR'] error

On 23 Δεκ 2011, 19:14, Νικόλαος Κούρας <nikos.kou...@gmail.com> wrote:
> On 23 Äåê, 12:41, becky_lewis <bex.le...@gmail.com> wrote:
>
> > Is there any possibility that you can tell us what the script actually
> > is or provide a code listing (use pastebin if it's big)?
>
> The script is about retrieving and storing the visitros hostnames to
> mysql database creating a log file.
>
> I dont know why this line host =
> socket.gethostbyaddr( os.environ['REMOTE_ADDR'] )[0] fails sometimes
> and some other times works ok retrieving the hostnames correctly.
>
> What do you understand from the traceback?!

Please i need some help. My webpage doesn't work due to this error...

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#18327

Am 02.01.2012 14:25, schrieb Νικόλαος Κούρας:
> On 23 Δεκ 2011, 19:14, Νικόλαος Κούρας<nikos.kou...@gmail.com>  wrote:
>> I dont know why this line host =
>> socket.gethostbyaddr( os.environ['REMOTE_ADDR'] )[0] fails sometimes
>> and some other times works ok retrieving the hostnames correctly.
>
> Please i need some help. My webpage doesn't work due to this error...

The error "herror: (1, ...)" says it all: the DNS-name (i.e., the 
<something>.in-addr.arpa name) you're trying to resolve is unknown. Not 
all hosts (or rather, IPs) on the internet have reverse lookups: try the 
IP 81.14.209.35 from which I'm posting, and dig/nslookup will tell you 
that it has no reverse resolution, which would result in gethostbyaddr() 
throwing an herror-instance.

Basically: make the reverse lookup conditional by wrapping it in a 
try:/except herror: and assigning an appropriate default for host in 
case reverse lookup fails.

-- 
--- Heiko.

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#18329

On 2 Ιαν, 16:00, Heiko Wundram <modeln...@modelnine.org> wrote:
> Am 02.01.2012 14:25, schrieb Νικόλαος Κούρας:
>
> > On 23 Δεκ 2011, 19:14, Νικόλαος Κούρας<nikos.kou...@gmail.com>  wrote:
> >> I dont know why this line host =
> >> socket.gethostbyaddr( os.environ['REMOTE_ADDR'] )[0] fails sometimes
> >> and some other times works ok retrieving the hostnames correctly.
>
> > Please i need some help. My webpage doesn't work due to this error...
>
> The error "herror: (1, ...)" says it all: the DNS-name (i.e., the
> <something>.in-addr.arpa name) you're trying to resolve is unknown. Not
> all hosts (or rather, IPs) on the internet have reverse lookups: try the
> IP 81.14.209.35 from which I'm posting, and dig/nslookup will tell you
> that it has no reverse resolution, which would result in gethostbyaddr()
> throwing an herror-instance.

I see

> Basically: make the reverse lookup conditional by wrapping it in a
> try:/except herror: and assigning an appropriate default for host in
> case reverse lookup fails.

Can tou show me how to write this please?

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#18330

In article 
<6b787f23-5813-4831-a349-02883f564da4@q7g2000yqn.googlegroups.com>,
 ÉΪÉ«É»όλαος Κούρας <nikos.kouras@gmail.com> wrote:

> On 2 ÉßÉΩÉΥ, 16:00, Heiko Wundram <modeln...@modelnine.org> wrote:
> > Am 02.01.2012 14:25, schrieb ÉΪÉ«É»όλαος Κούρας:
> >
> > > On 23 Δεκ 2011, 19:14, Νικόλαος Κούρας<nikos.kou...@gmail.com>  wrote:
> > >> I dont know why this line host =
> > >> socket.gethostbyaddr( os.environ['REMOTE_ADDR'] )[0] fails sometimes
> > >> and some other times works ok retrieving the hostnames correctly.
> >
> > > Please i need some help. My webpage doesn't work due to this error...
> >
> > The error "herror: (1, ...)" says it all: the DNS-name (i.e., the
> > <something>.in-addr.arpa name) you're trying to resolve is unknown. Not
> > all hosts (or rather, IPs) on the internet have reverse lookups: try the
> > IP 81.14.209.35 from which I'm posting, and dig/nslookup will tell you
> > that it has no reverse resolution, which would result in gethostbyaddr()
> > throwing an herror-instance.
> 
> I see
> 
> > Basically: make the reverse lookup conditional by wrapping it in a
> > try:/except herror: and assigning an appropriate default for host in
> > case reverse lookup fails.
> 
> Can tou show me how to write this please?

try:
   host =  socket.gethostbyaddr( os.environ['REMOTE_ADDR'] )[0]
except socket.herror:
   host = "<unknown host>"

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#18338

On 2 Ιαν, 17:47, Roy Smith <r...@panix.com> wrote:
> In article
> <6b787f23-5813-4831-a349-02883f564...@q7g2000yqn.googlegroups.com>,
>  ÉΪÉ«É»όλαος Κούρας <nikos.kou...@gmail.com> wrote:
>
>
>
>
>
>
>
>
>
> > On 2 ÉßÉΩÉΥ, 16:00, Heiko Wundram <modeln...@modelnine.org> wrote:
> > > Am 02.01.2012 14:25, schrieb ÉΪÉ«É»όλαος Κούρας:
>
> > > > On 23 Δεκ 2011, 19:14, Νικόλαος Κούρας<nikos.kou...@gmail.com>  wrote:
> > > >> I dont know why this line host =
> > > >> socket.gethostbyaddr( os.environ['REMOTE_ADDR'] )[0] fails sometimes
> > > >> and some other times works ok retrieving the hostnames correctly.
>
> > > > Please i need some help. My webpage doesn't work due to this error...
>
> > > The error "herror: (1, ...)" says it all: the DNS-name (i.e., the
> > > <something>.in-addr.arpa name) you're trying to resolve is unknown. Not
> > > all hosts (or rather, IPs) on the internet have reverse lookups: try the
> > > IP 81.14.209.35 from which I'm posting, and dig/nslookup will tell you
> > > that it has no reverse resolution, which would result in gethostbyaddr()
> > > throwing an herror-instance.
>
> > I see
>
> > > Basically: make the reverse lookup conditional by wrapping it in a
> > > try:/except herror: and assigning an appropriate default for host in
> > > case reverse lookup fails.
>
> > Can tou show me how to write this please?
>
> try:
>    host =  socket.gethostbyaddr( os.environ['REMOTE_ADDR'] )[0]
> except socket.herror:
>    host = "<unknown host>"

Thank you very much.

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