102 lines
2.4 KiB
Go
102 lines
2.4 KiB
Go
// SPDX-License-Identifier: BSD-3-Clause
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package resolvers
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import (
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"crypto/tls"
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"fmt"
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"io"
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"time"
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"git.froth.zone/sam/awl/pkg/util"
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"github.com/lucas-clemente/quic-go"
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"github.com/miekg/dns"
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)
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// QUICResolver is for DNS-over-QUIC queries.
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type QUICResolver struct {
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opts util.Options
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}
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var _ Resolver = (*QUICResolver)(nil)
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// LookUp performs a DNS query.
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func (resolver *QUICResolver) LookUp(msg *dns.Msg) (util.Response, error) {
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var resp util.Response
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tls := &tls.Config{
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//nolint:gosec // This is intentional if the user requests it
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InsecureSkipVerify: resolver.opts.TLSNoVerify,
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ServerName: resolver.opts.TLSHost,
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MinVersion: tls.VersionTLS12,
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NextProtos: []string{"doq"},
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}
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conf := new(quic.Config)
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conf.HandshakeIdleTimeout = resolver.opts.Request.Timeout
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resolver.opts.Logger.Debug("quic: making query")
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connection, err := quic.DialAddr(resolver.opts.Request.Server, tls, conf)
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if err != nil {
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return util.Response{}, fmt.Errorf("doq: dial: %w", err)
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}
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resolver.opts.Logger.Debug("quic: packing query")
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// Compress request to over-the-wire
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buf, err := msg.Pack()
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if err != nil {
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return util.Response{}, fmt.Errorf("doq: pack: %w", err)
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}
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t := time.Now()
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resolver.opts.Logger.Debug("quic: creating stream")
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stream, err := connection.OpenStream()
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if err != nil {
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return util.Response{}, fmt.Errorf("doq: quic stream creation: %w", err)
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}
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resolver.opts.Logger.Debug("quic: writing to stream")
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_, err = stream.Write(buf)
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if err != nil {
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return util.Response{}, fmt.Errorf("doq: quic stream write: %w", err)
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}
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resolver.opts.Logger.Debug("quic: reading stream")
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fullRes, err := io.ReadAll(stream)
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if err != nil {
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return util.Response{}, fmt.Errorf("doq: quic stream read: %w", err)
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}
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resp.RTT = time.Since(t)
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resolver.opts.Logger.Debug("quic: closing connection")
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// Close with error: no error
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err = connection.CloseWithError(0, "")
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if err != nil {
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return util.Response{}, fmt.Errorf("doq: quic connection close: %w", err)
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}
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resolver.opts.Logger.Debug("quic: closing stream")
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err = stream.Close()
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if err != nil {
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return util.Response{}, fmt.Errorf("doq: quic stream close: %w", err)
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}
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resp.DNS = &dns.Msg{}
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resolver.opts.Logger.Debug("quic: unpacking response")
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err = resp.DNS.Unpack(fullRes)
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if err != nil {
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return util.Response{}, fmt.Errorf("doq: unpack: %w", err)
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}
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return resp, nil
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}
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