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plugin/hosts: fix for ipv4-in-ipv6 (#2506)

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* fix for ipv4-in-ipv6

* update comment as requested
This commit is contained in:
Thomas Mangin 2019-01-28 16:36:34 +00:00 • committed by Miek Gieben
parent d571fbe046
commit e343556687
2 changed files with 18 additions and 2 deletions
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4
plugin/hosts/hostsfile.go
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@ -185,8 +185,10 @@ func (h *Hostsfile) parse(r io.Reader, override *hostsMap) *hostsMap {
}
// ipVersion returns what IP version was used textually
// For why the string is parsed end to start,
// see IPv4-Compatible IPv6 addresses - RFC 4291 section 2.5.5
func ipVersion(s string) int {
for i := 0; i < len(s); i++ {
for i := len(s) - 1; i >= 0; i-- {
switch s[i] {
case '.':
return 4