Allow -utls random for HelloRandomizedALPN.

README

@@ -292,11 +292,13 @@ names, each optionally preceded by an integer weight and `*`.
 ```
 $ ./dnstt-client -utls '3*Firefox,2*Chrome,1*iOS' ...
 $ ./dnstt-client -utls Firefox ...
+$ ./dnstt-client -utls random ...
 ```
 Run `./dnstt-client -help` to see the available fingerprint names and
-the default distribution. The special value `none` disables uTLS and
-uses the native crypto/tls fingerprint, which is less covert but likely
-to be compatible with more servers.
+the default distribution. The `random` fingerprint is a randomized
+fingerprint. The special value `none` disables uTLS and uses the native
+crypto/tls fingerprint, which is less covert but likely to be compatible
+with more servers.
 
 
 ## Encryption and authentication

dnstt-client/utls.go

@@ -22,6 +22,7 @@ var utlsClientHelloIDMap = []struct {
 	Label string
 	ID    *utls.ClientHelloID
 }{
+	{"random", &utls.HelloRandomizedALPN},
 	{"Firefox", &utls.HelloFirefox_Auto},
 	{"Firefox_55", &utls.HelloFirefox_55},
 	{"Firefox_56", &utls.HelloFirefox_56},

man/dnstt-client.1

@@ -159,6 +159,8 @@ Examples:
 .It
 -utls Firefox
 .It
+-utls random
+.It
 -utls none
 .El
 
@@ -168,6 +170,9 @@ Use the
 option to see the default distribution
 and the set of available fingerprint labels.
 The special value
+.Cm random
+stands for a randomized fingerprint.
+The special value
 .Cm none
 disables uTLS and uses the native Go crypto/tls fingerprint.