mirror of
https://github.com/ergochat/ergo.git
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commit
b975c6f182
17
irc/net.go
17
irc/net.go
@ -28,16 +28,19 @@ func AddrLookupHostname(addr net.Addr) string {
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// LookupHostname returns the hostname for `addr` if it has one. Otherwise, just returns `addr`.
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func LookupHostname(addr string) string {
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names, err := net.LookupAddr(addr)
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if err != nil || len(names) < 1 || !IsHostname(names[0]) {
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// return original address if no hostname found
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if len(addr) > 0 && addr[0] == ':' {
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// fix for IPv6 hostnames (so they don't start with a colon), same as all other IRCds
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addr = "0" + addr
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if err == nil && len(names) > 0 {
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candidate := strings.TrimSuffix(names[0], ".")
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if IsHostname(candidate) {
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return candidate
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}
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return addr
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}
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return names[0]
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// return original address if no hostname found
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if len(addr) > 0 && addr[0] == ':' {
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// fix for IPv6 hostnames (so they don't start with a colon), same as all other IRCds
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addr = "0" + addr
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}
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return addr
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}
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var allowedHostnameChars = "abcdefghijklmnopqrstuvwxyz1234567890-."
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