65 lines
1.2 KiB
Go
65 lines
1.2 KiB
Go
// SPDX-License-Identifier: BSD-3-Clause
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package resolvers
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import (
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"fmt"
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"time"
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"dns.froth.zone/awl/pkg/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 (resolver *DNSCryptResolver) LookUp(msg *dns.Msg) (resp util.Response, err error) {
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client := dnscrypt.Client{
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Timeout: resolver.opts.Request.Timeout,
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UDPSize: 1232,
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}
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if resolver.opts.TCP || resolver.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 resolver.opts.IPv4:
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client.Net += "4"
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case resolver.opts.IPv6:
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client.Net += "6"
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}
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resolver.opts.Logger.Debug("Using", client.Net, "for making the request")
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resolverInf, err := client.Dial(resolver.opts.Request.Server)
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if err != nil {
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return resp, 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 resp, fmt.Errorf("dnscrypt: exchange: %w", err)
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}
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resp = util.Response{
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DNS: res,
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RTT: rtt,
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}
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resolver.opts.Logger.Info("Request successful")
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return
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}
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