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util/dnsname: normalize leading dots in ToFQDN.

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Fixes #1888.

Signed-off-by: David Anderson <dave@natulte.net>
This commit is contained in:
David Anderson 2021-05-10 13:04:32 -07:00
parent c0a70f3a06
commit dc32b4695c
2 changed files with 6 additions and 2 deletions
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5
util/dnsname/dnsname.go
View File

@ -24,13 +24,16 @@ func ToFQDN(s string) (FQDN, error) {
if isValidFQDN(s) {
return FQDN(s), nil
}
if len(s) == 0 {
if len(s) == 0 || s == "." {
return FQDN("."), nil
}
if s[len(s)-1] == '.' {
s = s[:len(s)-1]
}
if s[0] == '.' {
s = s[1:]
}
if len(s) > maxNameLength {
return "", fmt.Errorf("%q is too long to be a DNS name", s)
}

3
util/dnsname/dnsname_test.go
View File

@ -20,11 +20,12 @@ func TestFQDN(t *testing.T) {
{".", ".", false, 0},
{"foo.com", "foo.com.", false, 2},
{"foo.com.", "foo.com.", false, 2},
{".foo.com.", "foo.com.", false, 2},
{".foo.com", "foo.com.", false, 2},
{"com", "com.", false, 1},
{"www.tailscale.com", "www.tailscale.com.", false, 3},
{"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.com", "", true, 0},
{strings.Repeat("aaaaa.", 60) + "com", "", true, 0},
{".com", "", true, 0},
{"foo..com", "", true, 0},
}