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| author |  Francois Tur <ftur@infoblox.com>
| 2018-01-23 10:58:36 -0500 |
|---|---|---|
| committer |  Miek Gieben <miek@miek.nl>
| 2018-01-23 15:58:36 +0000 |
| commit | f9c03c2ead6ae655006b3b8264b9870028884d8f (patch) | |
| tree | 11c04997e8b01f6573b6d9aa5d707e149fdd516b /plugin/normalize.go | |
| parent | 9575789c363d9fc72eb96f3263e94d2037142335 (diff) | |
| download | coredns-f9c03c2ead6ae655006b3b8264b9870028884d8f.tar.gz coredns-f9c03c2ead6ae655006b3b8264b9870028884d8f.tar.zst coredns-f9c03c2ead6ae655006b3b8264b9870028884d8f.zip | |
fix computation of reverse zone based on Ipv6 CIDRs (#1415)
Diffstat (limited to 'plugin/normalize.go')
| -rw-r--r-- | plugin/normalize.go | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/plugin/normalize.go b/plugin/normalize.go index f8cbcf7a0..ef6f2eaa0 100644 --- a/plugin/normalize.go +++ b/plugin/normalize.go @@ -115,11 +115,16 @@ func SplitHostPort(s string) (host, port string, ipnet *net.IPNet, err error) { if err == nil { if rev, e := dns.ReverseAddr(ip.String()); e == nil { ones, bits = n.Mask.Size() + // get the size, in bits, of each portion of hostname defined in the reverse address. (8 for IPv4, 4 for IPv6) + sizeDigit := 8 + if len(n.IP) == net.IPv6len { + sizeDigit = 4 + } // Get the first lower octet boundary to see what encompassing zone we should be authoritative for. - mod := (bits - ones) % 8 + mod := (bits - ones) % sizeDigit nearest := (bits - ones) + mod offset, end := 0, false - for i := 0; i < nearest/8; i++ { + for i := 0; i < nearest/sizeDigit; i++ { offset, end = dns.NextLabel(rev, offset) if end { break |