socket.gethostbyaddr( os.environ['REMOTE_ADDR'] error
Heiko Wundram
modelnine at modelnine.org
Mon Jan 2 09:00:26 EST 2012
Am 02.01.2012 14:25, schrieb Νικόλαος Κούρας:
> On 23 Δεκ 2011, 19:14, Νικόλαος Κούρας<nikos.kou... at 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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