allow manual control port authenticate via netcat

changes/bug2893

@@ -0,0 +1,5 @@
+  o Minor bugfixes:
+    - Allow manual 'authenticate' commands to the controller interface
+      from nc as well as telnet. We were rejecting them because they
+      didn't come with the expected whitespace at the end of the command.
+      Bugfix on 0.1.1.1-alpha; fixes bug 2893.

src/or/control.c

@@ -1055,7 +1055,10 @@ handle_control_authenticate(control_connection_t *conn, uint32_t len,
   int bad_cookie=0, bad_password=0;
   smartlist_t *sl = NULL;
 
-  if (TOR_ISXDIGIT(body[0])) {
+  if (!len || TOR_ISSPACE(body[0])) {
+    password = tor_strdup("");
+    password_len = 0;
+  } else if (TOR_ISXDIGIT(body[0])) {
     cp = body;
     while (TOR_ISXDIGIT(*cp))
       ++cp;
@@ -1072,9 +1075,6 @@ handle_control_authenticate(control_connection_t *conn, uint32_t len,
       tor_free(password);
       return 0;
     }
-  } else if (TOR_ISSPACE(body[0])) {
-    password = tor_strdup("");
-    password_len = 0;
   } else {
     if (!decode_escaped_string(body, len, &password, &password_len)) {
       connection_write_str_to_buf("551 Invalid quoted string.  You need "