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| author | Roland Shoemaker <roland@golang.org> | 2021-06-30 14:28:18 -0700 |
|---|---|---|
| committer | Roland Shoemaker <roland@golang.org> | 2021-07-08 16:45:40 +0000 |
| commit | 0579cf14060179a51300c157f3952528a6d25997 (patch) | |
| tree | f1d3701924b5a7894b5d1ae191548dd01770d7f1 /src/net/lookup.go | |
| parent | b51bf4febc32dfa6bb3c1cf467f1513a1d6d8b75 (diff) | |
| download | go-0579cf14060179a51300c157f3952528a6d25997.tar.gz go-0579cf14060179a51300c157f3952528a6d25997.zip | |
[release-branch.go1.15] net: don't reject null mx records
Bypass hostname validity checking when a null mx record is returned as,
defined in RFC 7505.
Updates #46979
Updates #47012
Change-Id: Ibe683bd6b47333a8ff30909fb2680ec8e10696ef
Reviewed-on: https://go-review.googlesource.com/c/go/+/332094
Trust: Roland Shoemaker <roland@golang.org>
Trust: Katie Hockman <katie@golang.org>
Run-TryBot: Roland Shoemaker <roland@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Katie Hockman <katie@golang.org>
(cherry picked from commit 03761ede028d811dd7d7cf8a2690d4bfa2771d85)
Reviewed-on: https://go-review.googlesource.com/c/go/+/332372
Run-TryBot: Katie Hockman <katie@golang.org>
Diffstat (limited to 'src/net/lookup.go')
| -rw-r--r-- | src/net/lookup.go | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/src/net/lookup.go b/src/net/lookup.go index 0660268249..01c81dbaaf 100644 --- a/src/net/lookup.go +++ b/src/net/lookup.go @@ -488,7 +488,9 @@ func (r *Resolver) LookupMX(ctx context.Context, name string) ([]*MX, error) { if mx == nil { continue } - if !isDomainName(mx.Host) { + // Bypass the hostname validity check for targets which contain only a dot, + // as this is used to represent a 'Null' MX record. + if mx.Host != "." && !isDomainName(mx.Host) { return nil, &DNSError{Err: "MX target is invalid", Name: name} } } |