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net: LookupHost returns error when given an IP. #684

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gopherbot opened this issue Mar 20, 2010 · 6 comments
Closed

net: LookupHost returns error when given an IP. #684

gopherbot opened this issue Mar 20, 2010 · 6 comments
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@gopherbot
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by emilliken:

Perhaps rather than giving an error, it can act the same way as C's 
gethostbyname(name)?  From the gethostbyname() manpage:
 
If name is an IPv4 or IPv6 address, no lookup is performed and 
gethostbyname() simply copies name into the  h_name  field  and  its
struct  in_addr equivalent into the h_addr_list[0] field of the returned
hostent structure.

Which revision are you using?
changeset:   5092:c4e62b8f7f1c
@rsc
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rsc commented Mar 22, 2010

Comment 1:

Isn't that what ParseIP is for?
What's the bigger context here?

@gopherbot
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Comment 2 by emilliken:

I had written a program that needed to Dial() the same host over and over.  To avoid 
doing a dns lookup inside Dial() every time, I would call net.LookupHost() and pass the 
returned IP to Dial.  The program failed when I would call net.LookupHost with an IP, 
which was unexpected (I was used to the gethostbyname behavior).  Not a big deal, but 
perhaps the behavior should be documented.

@rsc
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rsc commented Mar 22, 2010

Comment 3:

You can avoid both the DNS lookup and even the parsing if instead you use
net.ResolveTCPAddr (or 
ResolveUDPAddr) and net.DialTCP (or net.DialUDP).

@gopherbot
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Comment 4 by emilliken:

ResolveTCPAddr is what I was looking for, thanks.

@rsc
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rsc commented Mar 25, 2010

Comment 5:

Status changed to WorkingAsIntended.

@mikioh mikioh changed the title net.LookupHost returns error when given an IP. net: LookupHost returns error when given an IP. Aug 5, 2015
@mikioh mikioh added this to the Go1.5 milestone Aug 5, 2015
@mikioh
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mikioh commented Aug 5, 2015

Merged into #11335.

@golang golang locked and limited conversation to collaborators Aug 5, 2016
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