63 lines
1.1 KiB
Go
63 lines
1.1 KiB
Go
// SPDX-License-Identifier: BSD-3-Clause
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package query
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import (
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"fmt"
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"time"
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"git.froth.zone/sam/awl/util"
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"github.com/ameshkov/dnscrypt/v2"
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"github.com/miekg/dns"
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)
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// DNSCryptResolver is for making DNSCrypt queries.
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type DNSCryptResolver struct {
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opts util.Options
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}
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var _ Resolver = (*DNSCryptResolver)(nil)
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// LookUp performs a DNS query.
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func (r *DNSCryptResolver) LookUp(msg *dns.Msg) (util.Response, error) {
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client := dnscrypt.Client{
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Timeout: r.opts.Request.Timeout,
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UDPSize: 1232,
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}
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if r.opts.TCP || r.opts.TLS {
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client.Net = tcp
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} else {
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client.Net = udp
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}
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switch {
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case r.opts.IPv4:
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client.Net += "4"
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case r.opts.IPv6:
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client.Net += "6"
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}
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r.opts.Logger.Debug("Using", client.Net, "for making the request")
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resolverInf, err := client.Dial(r.opts.Request.Server)
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if err != nil {
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return util.Response{}, fmt.Errorf("dnscrypt: dial: %w", err)
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}
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now := time.Now()
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res, err := client.Exchange(msg, resolverInf)
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rtt := time.Since(now)
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if err != nil {
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return util.Response{}, fmt.Errorf("dnscrypt: exchange: %w", err)
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}
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r.opts.Logger.Info("Request successful")
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return util.Response{
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DNS: res,
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RTT: rtt,
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}, nil
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}
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