diff options
| -rw-r--r-- | src/net/dnsclient_unix.go | 6 | ||||
| -rw-r--r-- | src/net/dnsclient_unix_test.go | 2 |
2 files changed, 6 insertions, 2 deletions
diff --git a/src/net/dnsclient_unix.go b/src/net/dnsclient_unix.go index d7db0c8133..0aa9ad7b93 100644 --- a/src/net/dnsclient_unix.go +++ b/src/net/dnsclient_unix.go @@ -29,6 +29,10 @@ const ( // to be used as a useTCP parameter to exchange useTCPOnly = true useUDPOrTCP = false + + // Maximum DNS packet size. + // Value taken from https://dnsflagday.net/2020/. + maxDNSPacketSize = 1232 ) var ( @@ -81,7 +85,7 @@ func dnsPacketRoundTrip(c Conn, id uint16, query dnsmessage.Question, b []byte) return dnsmessage.Parser{}, dnsmessage.Header{}, err } - b = make([]byte, 512) // see RFC 1035 + b = make([]byte, maxDNSPacketSize) for { n, err := c.Read(b) if err != nil { diff --git a/src/net/dnsclient_unix_test.go b/src/net/dnsclient_unix_test.go index e7f7621a09..e8afbbe29e 100644 --- a/src/net/dnsclient_unix_test.go +++ b/src/net/dnsclient_unix_test.go @@ -881,7 +881,7 @@ func (f *fakeDNSPacketConn) Close() error { func TestIgnoreDNSForgeries(t *testing.T) { c, s := Pipe() go func() { - b := make([]byte, 512) + b := make([]byte, maxDNSPacketSize) n, err := s.Read(b) if err != nil { t.Error(err) |