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http3_resolver.go
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/
http3_resolver.go
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package resolver
import (
"bytes"
"context"
"crypto/tls"
"io"
"net"
"net/http"
"github.com/miekg/dns"
"github.com/quic-go/quic-go"
"github.com/quic-go/quic-go/http3"
)
type HTTP3Resolver struct {
BaseResolver
client http.Client
}
func (r *HTTP3Resolver) Exchange(q *dns.Msg) (*dns.Msg, error) {
request, err := q.Pack()
resp, err := r.client.Post(r.dnsUpstream.Address, "application/dns-message",
bytes.NewBuffer(request))
if err != nil {
return nil, err
}
defer resp.Body.Close()
data, err := io.ReadAll(resp.Body)
if err != nil {
return nil, err
}
msg := new(dns.Msg)
err = msg.Unpack(data)
if err != nil {
return nil, err
}
return msg, nil
}
func (r *HTTP3Resolver) Init() error {
err := r.BaseResolver.Init()
if err != nil {
return err
}
r.client = http.Client{
Transport: &http3.RoundTripper{
Dial: func(ctx context.Context, addr string, tlsCfg *tls.Config, cfg *quic.Config) (quic.EarlyConnection, error) {
return quic.DialEarly(ctx, &net.IPConn{}, &net.UDPAddr{}, tlsCfg, cfg)
},
},
}
return nil
}