Add third_party/pexpect

third_party/pexpect/tests/echo_wait.py

+#!/usr/bin/env python
+'''
+PEXPECT LICENSE
+
+    This license is approved by the OSI and FSF as GPL-compatible.
+        http://opensource.org/licenses/isc-license.txt
+
+    Copyright (c) 2012, Noah Spurrier <noah@noah.org>
+    PERMISSION TO USE, COPY, MODIFY, AND/OR DISTRIBUTE THIS SOFTWARE FOR ANY
+    PURPOSE WITH OR WITHOUT FEE IS HEREBY GRANTED, PROVIDED THAT THE ABOVE
+    COPYRIGHT NOTICE AND THIS PERMISSION NOTICE APPEAR IN ALL COPIES.
+    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+    MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+'''
+import time
+import termios
+import sys
+
+# a dumb PAM will print the password prompt first then set ECHO
+# False. What it should do it set ECHO False first then print the
+# prompt. Otherwise, if we see the password prompt and type out
+# password real fast before it turns off ECHO then some or all of
+# our password might be visibly echod back to us. Sounds unlikely?
+# It happens.
+
+print("fake password:")
+sys.stdout.flush()
+time.sleep(3)
+attr = termios.tcgetattr(sys.stdout)
+attr[3] = attr[3] & ~termios.ECHO
+termios.tcsetattr(sys.stdout, termios.TCSANOW, attr)
+time.sleep(12)
+attr[3] = attr[3] | termios.ECHO
+termios.tcsetattr(sys.stdout, termios.TCSANOW, attr)
+time.sleep(2)