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fix hostmask issue

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PTR records ending in . (e.g., `google-public-dns-b.google.com.`)
were considered invalid
This commit is contained in:
Shivaram Lingamneni 2017-09-05 11:43:50 -04:00
parent ffabd26653
commit 9a9a85cd55
1 changed files with 10 additions and 7 deletions
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11
irc/net.go
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@ -28,16 +28,19 @@ func AddrLookupHostname(addr net.Addr) string {
// LookupHostname returns the hostname for `addr` if it has one. Otherwise, just returns `addr`.
func LookupHostname(addr string) string {
names, err := net.LookupAddr(addr)
if err != nil || len(names) < 1 || !IsHostname(names[0]) {
if err == nil && len(names) > 0 {
candidate := strings.TrimSuffix(names[0], ".")
if IsHostname(candidate) {
return candidate
}
}
// return original address if no hostname found
if len(addr) > 0 && addr[0] == ':' {
// fix for IPv6 hostnames (so they don't start with a colon), same as all other IRCds
addr = "0" + addr
}
return addr
}
return names[0]
}
var allowedHostnameChars = "abcdefghijklmnopqrstuvwxyz1234567890-."