116 lines
3.2 KiB
Go
116 lines
3.2 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 api
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import (
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"encoding/json"
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"errors"
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"io"
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"math/rand"
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"strings"
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"time"
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"github.com/julienschmidt/httprouter"
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"github.com/miekg/dns"
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"git.happydns.org/happydns/config"
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)
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func init() {
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router.POST("/api/resolver", ApiHandler(runResolver))
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}
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type resolverRequest struct {
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Resolver string `json:"resolver"`
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Custom string `json:"custom,omitempty"`
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DomainName string `json:"domain"`
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Type string `json:"type"`
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}
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func runResolver(_ *config.Options, ps httprouter.Params, body io.Reader) Response {
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var urr resolverRequest
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err := json.NewDecoder(body).Decode(&urr)
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if err != nil {
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return APIErrorResponse{
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err: err,
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}
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}
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urr.DomainName = dns.Fqdn(urr.DomainName)
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if urr.Resolver == "custom" {
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urr.Resolver = urr.Custom
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} else if urr.Resolver == "local" {
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cConf, err := dns.ClientConfigFromFile("/etc/resolv.conf")
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if err != nil {
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return APIErrorResponse{
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err: err,
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}
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}
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urr.Resolver = cConf.Servers[rand.Intn(len(cConf.Servers))]
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}
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if strings.Count(urr.Resolver, ":") > 0 && urr.Resolver[0] != '[' {
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urr.Resolver = "[" + urr.Resolver + "]"
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}
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client := dns.Client{Timeout: time.Second * 5}
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m := new(dns.Msg)
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m.SetQuestion(urr.DomainName, dns.StringToType[urr.Type])
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m.RecursionDesired = true
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m.SetEdns0(4096, true)
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r, _, err := client.Exchange(m, urr.Resolver+":53")
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if err != nil {
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return APIErrorResponse{
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err: err,
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}
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}
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if r == nil {
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return APIErrorResponse{
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err: errors.New("response is nil"),
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}
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}
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if r.Rcode != dns.RcodeSuccess {
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return APIErrorResponse{
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err: errors.New("failed to get a valid answer"),
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}
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}
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return APIResponse{
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response: r,
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}
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}
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