68 lines
1.5 KiB
Go
68 lines
1.5 KiB
Go
// SPDX-License-Identifier: BSD-3-Clause
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package resolvers
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import (
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"net"
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"strconv"
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"strings"
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"git.froth.zone/sam/awl/pkg/util"
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"github.com/miekg/dns"
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)
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const (
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tcp = "tcp"
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udp = "udp"
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)
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// Resolver is the main resolver interface.
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type Resolver interface {
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LookUp(*dns.Msg) (util.Response, error)
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}
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// LoadResolver loads the respective resolver for performing a DNS query.
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func LoadResolver(opts *util.Options) (Resolver, error) {
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switch {
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case opts.HTTPS:
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opts.Logger.Info("loading DNS-over-HTTPS resolver")
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if !strings.HasPrefix(opts.Request.Server, "https://") {
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opts.Request.Server = "https://" + opts.Request.Server
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}
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return &HTTPSResolver{
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opts: opts,
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}, nil
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case opts.QUIC:
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opts.Logger.Info("loading DNS-over-QUIC resolver")
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if !strings.HasSuffix(opts.Request.Server, ":"+strconv.Itoa(opts.Request.Port)) {
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opts.Request.Server = net.JoinHostPort(opts.Request.Server, strconv.Itoa(opts.Request.Port))
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}
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return &QUICResolver{
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opts: opts,
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}, nil
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case opts.DNSCrypt:
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opts.Logger.Info("loading DNSCrypt resolver")
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if !strings.HasPrefix(opts.Request.Server, "sdns://") {
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opts.Request.Server = "sdns://" + opts.Request.Server
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}
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return &DNSCryptResolver{
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opts: opts,
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}, nil
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default:
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opts.Logger.Info("loading standard/DNS-over-TLS resolver")
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if !strings.HasSuffix(opts.Request.Server, ":"+strconv.Itoa(opts.Request.Port)) {
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opts.Request.Server = net.JoinHostPort(opts.Request.Server, strconv.Itoa(opts.Request.Port))
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}
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return &StandardResolver{
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opts: opts,
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}, nil
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}
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}
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