From 9d5bd561419e1145aea81ee820bc3e8405c4fd57 Mon Sep 17 00:00:00 2001
From: Tom Smeding <tom.smeding@gmail.com>
Date: Tue, 13 Oct 2020 21:46:42 +0200
Subject: rust: Server and account command-line arguments

---
 rust/src/getpass.rs | 65 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 rust/src/getpass.rs

(limited to 'rust/src/getpass.rs')

diff --git a/rust/src/getpass.rs b/rust/src/getpass.rs
new file mode 100644
index 0000000..f40da0e
--- /dev/null
+++ b/rust/src/getpass.rs
@@ -0,0 +1,65 @@
+extern crate libc;
+
+use std::io::{self, Write};
+use std::mem;
+use std::str;
+
+fn error_checker(ret: i32) -> io::Result<()> {
+    if ret == 0 {
+        Ok(())
+    } else {
+        Err(io::Error::last_os_error())
+    }
+}
+
+fn tcgetattr(fd: i32) -> io::Result<libc::termios> {
+    unsafe {
+        let mut tios: libc::termios = mem::zeroed();
+        error_checker(libc::tcgetattr(fd, &mut tios))?;
+        Ok(tios)
+    }
+}
+
+fn tcsetattr(fd: i32, other_options: i32, tios: &libc::termios) -> io::Result<()> {
+    unsafe {
+        error_checker(libc::tcsetattr(fd, other_options, tios))?;
+        Ok(())
+    }
+}
+
+fn without_echo<T, F: FnOnce() -> io::Result<T>>(f: F) -> io::Result<T> {
+    let tios_old = tcgetattr(0)?;
+
+    let mut tios_new = tios_old;
+    tios_new.c_lflag &= !libc::ECHO;
+    tios_new.c_lflag |= libc::ECHONL;
+
+    match tcsetattr(0, libc::TCSANOW, &tios_new) {
+        Ok(()) => {},
+        Err(e) => {
+            // Just blindly try to reset the terminal, in case something changed
+            let _ = tcsetattr(0, libc::TCSANOW, &tios_old);
+            return Err(e);
+        }
+    }
+
+    let ret = f()?;
+
+    tcsetattr(0, libc::TCSANOW, &tios_old)?;
+
+    Ok(ret)
+}
+
+pub fn get_pass(prompt: &str) -> io::Result<String> {
+    print!("{}", prompt);
+    io::stdout().flush()?;
+
+    without_echo(|| {
+        let mut line = String::new();
+        io::stdin().read_line(&mut line)?;
+        if line.ends_with('\n') {
+            line.pop();
+        }
+        Ok(line)
+    })
+}
-- 
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