From a4b50a6f511e60a57955dab7586aba08a5c54337 Mon Sep 17 00:00:00 2001
From: Jethro Grassie <jtg@xtrabass.com>
Date: Thu, 1 Feb 2018 15:32:30 -0500
Subject: [PATCH] handle ^D and ^C while password prompting

---
 src/common/password.cpp           | 15 ++++++++++-----
 src/common/password.h             |  2 ++
 src/common/util.h                 |  6 +++++-
 src/simplewallet/simplewallet.cpp |  7 +++++++
 4 files changed, 24 insertions(+), 6 deletions(-)

diff --git a/src/common/password.cpp b/src/common/password.cpp
index ef026c979..9336a14fc 100644
--- a/src/common/password.cpp
+++ b/src/common/password.cpp
@@ -42,12 +42,10 @@
 #include <unistd.h>
 #endif
 
-#ifdef HAVE_READLINE
-  #include "readline_buffer.h"
-#endif
-
 #include "memwipe.h"
 
+#define EOT 0x4
+
 namespace
 {
 #if defined(_WIN32)
@@ -134,7 +132,7 @@ namespace
     while (aPass.size() < tools::password_container::max_password_size)
     {
       int ch = getch();
-      if (EOF == ch)
+      if (EOF == ch || ch == EOT)
       {
         return false;
       }
@@ -229,13 +227,20 @@ namespace tools
     m_password.clear();
   }
 
+  std::atomic<bool> password_container::is_prompting(false);
+
   boost::optional<password_container> password_container::prompt(const bool verify, const char *message)
   {
+    is_prompting = true;
     password_container pass1{};
     password_container pass2{};
     if (is_cin_tty() ? read_from_tty(verify, message, pass1.m_password, pass2.m_password) : read_from_file(pass1.m_password))
+    {
+      is_prompting = false;
       return {std::move(pass1)};
+    }
 
+    is_prompting = false;
     return boost::none;
   }
 
diff --git a/src/common/password.h b/src/common/password.h
index 7c29effe4..61937b93a 100644
--- a/src/common/password.h
+++ b/src/common/password.h
@@ -31,6 +31,7 @@
 #pragma once
 
 #include <string>
+#include <atomic>
 #include <boost/optional/optional.hpp>
 #include "wipeable_string.h"
 
@@ -49,6 +50,7 @@ namespace tools
 
     //! \return A password from stdin TTY prompt or `std::cin` pipe.
     static boost::optional<password_container> prompt(bool verify, const char *mesage = "Password");
+    static std::atomic<bool> is_prompting;
 
     password_container(const password_container&) = delete;
     password_container(password_container&& rhs) = default;
diff --git a/src/common/util.h b/src/common/util.h
index 5afb42c97..d3ba47a4f 100644
--- a/src/common/util.h
+++ b/src/common/util.h
@@ -153,8 +153,12 @@ namespace tools
       }
       return r;
 #else
+      static struct sigaction sa;
+      memset(&sa, 0, sizeof(struct sigaction));
+      sa.sa_handler = posix_handler;
+      sa.sa_flags = 0;
       /* Only blocks SIGINT, SIGTERM and SIGPIPE */
-      signal(SIGINT, posix_handler);
+      sigaction(SIGINT, &sa, NULL);
       signal(SIGTERM, posix_handler);
       signal(SIGPIPE, SIG_IGN);
       m_handler = t;
diff --git a/src/simplewallet/simplewallet.cpp b/src/simplewallet/simplewallet.cpp
index a6cef1bb9..ea9212ff1 100644
--- a/src/simplewallet/simplewallet.cpp
+++ b/src/simplewallet/simplewallet.cpp
@@ -638,6 +638,8 @@ bool simple_wallet::change_password(const std::vector<std::string> &args)
 
   // prompts for a new password, pass true to verify the password
   const auto pwd_container = default_password_prompter(true);
+  if(!pwd_container)
+    return true;
 
   try
   {
@@ -6806,6 +6808,11 @@ int main(int argc, char* argv[])
   else
   {
     tools::signal_handler::install([&w](int type) {
+      if (tools::password_container::is_prompting.load())
+      {
+        // must be prompting for password so return and let the signal stop prompt
+        return;
+      }
 #ifdef WIN32
       if (type == CTRL_C_EVENT)
 #else