12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758 |
- // Copyright (c) 2012-2014 Jeremy Latt
- // Copyright (c) 2016- Daniel Oaks <daniel@danieloaks.net>
- // released under the MIT license
-
- package irc
-
- import (
- "net"
- "strings"
- )
-
- func IPString(addr net.Addr) Name {
- addrStr := addr.String()
- ipaddr, _, err := net.SplitHostPort(addrStr)
- if err != nil {
- return Name(addrStr)
- }
- return Name(ipaddr)
- }
-
- func AddrLookupHostname(addr net.Addr) Name {
- return LookupHostname(IPString(addr))
- }
-
- func LookupHostname(addr Name) Name {
- names, err := net.LookupAddr(addr.String())
- if err != nil {
- return Name(addr)
- }
-
- hostname := strings.TrimSuffix(names[0], ".")
- return Name(hostname)
- }
-
- var allowedHostnameChars = "abcdefghijklmnopqrstuvwxyz1234567890-."
-
- func IsHostname(name string) bool {
- // IRC hostnames specifically require a period
- if !strings.Contains(name, ".") || len(name) < 1 || len(name) > 253 {
- return false
- }
-
- // ensure each part of hostname is valid
- for _, part := range strings.Split(name, ".") {
- if len(part) < 1 || len(part) > 63 || strings.HasPrefix(part, "-") || strings.HasSuffix(part, "-") {
- return false
- }
- }
-
- // ensure all chars of hostname are valid
- for _, char := range strings.Split(strings.ToLower(name), "") {
- if !strings.Contains(allowedHostnameChars, char) {
- return false
- }
- }
-
- return true
- }
|