ask-password: Add --echo to enable echoing the user input

Programs such as OpenVPN may use ask-password for not only retrieving
passwords, but also usernames.  Masking usernames with * seems just silly.

 v2 - Don't mess with termios flags, instead print the input
      instead of an asterix.  Resolves issues with backspace
      and TAB input.

 v3 - Renamed 'do_echo' variables and argument to 'echo'.  Also
      modified the ask_password_{tty,agent,auto} API instead of
      additional wrapper functions.

[zj: undo changes to ask_password_auto, since no callers were using
     the new argument.]

1 files changed, 3 insertions, 2 deletions

diff --git a/src/tty-ask-password-agent/tty-ask-password-agent.c b/src/tty-ask-password-agent/tty-ask-password-agent.c
index e7cbde285c..e6dc84b440 100644
--- a/src/tty-ask-password-agent/tty-ask-password-agent.c
+++ b/src/tty-ask-password-agent/tty-ask-password-agent.c
@@ -214,7 +214,7 @@ static int parse_password(const char *filename, char **wall) {
         _cleanup_free_ char *socket_name = NULL, *message = NULL, *packet = NULL;
         uint64_t not_after = 0;
         unsigned pid = 0;
-        bool accept_cached = false;
+        bool accept_cached = false, echo = false;
 
         const ConfigTableItem items[] = {
                 { "Ask", "Socket",       config_parse_string,   0, &socket_name   },
@@ -222,6 +222,7 @@ static int parse_password(const char *filename, char **wall) {
                 { "Ask", "Message",      config_parse_string,   0, &message       },
                 { "Ask", "PID",          config_parse_unsigned, 0, &pid           },
                 { "Ask", "AcceptCached", config_parse_bool,     0, &accept_cached },
+                { "Ask", "Echo",         config_parse_bool,     0, &echo          },
                 {}
         };
 
@@ -314,7 +315,7 @@ static int parse_password(const char *filename, char **wall) {
                                         return tty_fd;
                         }
 
-                        r = ask_password_tty(message, not_after, filename, &password);
+                        r = ask_password_tty(message, not_after, echo, filename, &password);
 
                         if (arg_console) {
                                 safe_close(tty_fd);