103 lines
3.0 KiB
Go
103 lines
3.0 KiB
Go
// Copyright or © or Copr. happyDNS (2020)
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//
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// contact@happydns.org
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//
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// This software is a computer program whose purpose is to provide a modern
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// interface to interact with DNS systems.
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//
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// This software is governed by the CeCILL license under French law and abiding
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// by the rules of distribution of free software. You can use, modify and/or
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// redistribute the software under the terms of the CeCILL license as
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// circulated by CEA, CNRS and INRIA at the following URL
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// "http://www.cecill.info".
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//
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// As a counterpart to the access to the source code and rights to copy, modify
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// and redistribute granted by the license, users are provided only with a
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// limited warranty and the software's author, the holder of the economic
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// rights, and the successive licensors have only limited liability.
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//
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// In this respect, the user's attention is drawn to the risks associated with
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// loading, using, modifying and/or developing or reproducing the software by
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// the user in light of its specific status of free software, that may mean
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// that it is complicated to manipulate, and that also therefore means that it
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// is reserved for developers and experienced professionals having in-depth
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// computer knowledge. Users are therefore encouraged to load and test the
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// software's suitability as regards their requirements in conditions enabling
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// the security of their systems and/or data to be ensured and, more generally,
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// to use and operate it in the same conditions as regards security.
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//
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// The fact that you are presently reading this means that you have had
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// knowledge of the CeCILL license and that you accept its terms.
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package utils
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import (
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"github.com/miekg/dns"
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)
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// SplitN splits a string into N sized string chunks.
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// This function is a copy of https://github.com/miekg/dns/blob/master/types.go#L1509
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// awaiting its exportation
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func SplitN(s string, n int) []string {
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if len(s) < n {
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return []string{s}
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}
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sx := []string{}
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p, i := 0, n
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for {
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if i <= len(s) {
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sx = append(sx, s[p:i])
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} else {
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sx = append(sx, s[p:])
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break
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}
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p, i = p+n, i+n
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}
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return sx
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}
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// IsDNSSECType returns true if the given rrtype is generally autogenerated by
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// NS server.
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func IsDNSSECType(rrtype uint16) bool {
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return rrtype == dns.TypeNSEC ||
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rrtype == dns.TypeNSEC3 ||
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rrtype == dns.TypeNSEC3PARAM ||
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rrtype == dns.TypeDNSKEY ||
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rrtype == dns.TypeRRSIG
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}
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// DomainFQDN normalizes the domain by adding the origin if it is relative (not
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// ended by .).
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func DomainFQDN(subdomain string, origin string) string {
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if subdomain == "" || subdomain[len(subdomain)-1] == '.' {
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return subdomain
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} else if subdomain == "@" {
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return origin
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} else {
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return subdomain + "." + origin
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}
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}
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// DomainJoin appends each relative domains passed as argument.
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func DomainJoin(domains ...string) (ret string) {
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for _, d := range domains {
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if d == "@" {
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break
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} else if d != "" {
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ret += "." + d
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}
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if len(ret) > 0 && ret[len(ret)-1] == '.' {
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break
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}
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}
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if len(ret) >= 1 {
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ret = ret[1:]
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}
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return
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}
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