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Experimental option to force DNS queries to use TCP (#1843)

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Co-authored-by: Fernandez Ludovic <ldez@users.noreply.github.com>
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Reinis 2023-07-20 05:37:48 +03:00 committed by GitHub
parent d4200c6d4c
commit bbc5e6118f
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9
challenge/dns01/nameserver.go
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@ -4,6 +4,8 @@ import (
"errors"
"fmt"
"net"
"os"
"strconv"
"strings"
"sync"
"time"
@ -250,6 +252,13 @@ func createDNSMsg(fqdn string, rtype uint16, recursive bool) *dns.Msg {
}
func sendDNSQuery(m *dns.Msg, ns string) (*dns.Msg, error) {
if ok, _ := strconv.ParseBool(os.Getenv("LEGO_EXPERIMENTAL_DNS_TCP_ONLY")); ok {
tcp := &dns.Client{Net: "tcp", Timeout: dnsTimeout}
in, _, err := tcp.Exchange(m, ns)
return in, err
}
udp := &dns.Client{Net: "udp", Timeout: dnsTimeout}
in, _, err := udp.Exchange(m, ns)