Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

net: nonexistentdomain.golang.org returns a CNAME to golang.org #25370

Closed
0intro opened this issue May 13, 2018 · 7 comments
Closed

net: nonexistentdomain.golang.org returns a CNAME to golang.org #25370

0intro opened this issue May 13, 2018 · 7 comments
Labels
FrozenDueToAge help wanted NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one.
Milestone
Go1.12

Comments

@0intro
Copy link
Member

0intro commented May 13, 2018

CL 111718 added TestLookupHostCancel.

This test sends a DNS request to nonexistentdomain.golang.org. However, this
DNS request succeeds and return a CNAME record to golang.org.

nonexistentdomain.golang.org. 86400 IN  CNAME   golang.org.
golang.org.             1800    IN      A       216.58.215.49

@alexbrainman @bradfitz
@0intro 0intro mentioned this issue May 13, 2018
Closed
@bradfitz bradfitz self-assigned this May 13, 2018
@bcmills bcmills added this to the Unreleased milestone May 23, 2018
@bcmills
Copy link
Contributor

bcmills commented Oct 29, 2018

I've been seeing this from time to time in the TryBots, too:
https://storage.googleapis.com/go-build-log/2ef40d4f/windows-amd64-2016_5206ec72.log

@bradfitz bradfitz removed their assignment Oct 29, 2018
@bradfitz bradfitz added help wanted NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. labels Oct 29, 2018
@bradfitz bradfitz modified the milestones: Unreleased, Go1.12 Oct 29, 2018
@bradfitz
Copy link
Contributor

Ian, could you check the golang.org DNS definitions in google3?

/cc @iangudger @mdempsky @dmitshur

@iangudger
Copy link
Contributor

It looks like we have a wildcard *.golang.org to golang.org CNAME.

@bradfitz
Copy link
Contributor

Does *.golang.org in our DNS config file also match two levels, like not.exist.golang.org?

@iangudger
Copy link
Contributor

Yes, it seems to.

@bradfitz
Copy link
Contributor

Per discussion elsewhere, this seems to be because golang.org has an HSTS policy and Google's servers add a *.golang.org CNAME record related to that.

So I guess we could move that test to use a different domain... notexist.example.com seems to work?

@ianlancetaylor ianlancetaylor changed the title nonexistentdomain.golang.org returns a CNAME to golang.org net: nonexistentdomain.golang.org returns a CNAME to golang.org Nov 28, 2018
@gopherbot
Copy link
Contributor

Change https://golang.org/cl/151359 mentions this issue: net: use .invalid for an invalid domain name

@golang golang locked and limited conversation to collaborators Nov 28, 2019
Sign up for free to subscribe to this conversation on GitHub. Already have an account? Sign in.
Assignees
No one assigned
Labels
FrozenDueToAge help wanted NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one.
Projects
None yet
Milestone
Go1.12
Development

No branches or pull requests
5 participants
@bradfitz @bcmills @0intro @iangudger @gopherbot