3 files changed, 153 insertions, 1 deletions
diff --git a/nitrocli/src/error.rs b/nitrocli/src/error.rs
new file mode 100644
index 0000000..65992f0
--- /dev/null
+++ b/nitrocli/src/error.rs
@@ -0,0 +1,45 @@
+// error.rs
+
+// *************************************************************************
+// * Copyright (C) 2017 Daniel Mueller (deso@posteo.net)                   *
+// *                                                                       *
+// * This program is free software: you can redistribute it and/or modify  *
+// * it under the terms of the GNU General Public License as published by  *
+// * the Free Software Foundation, either version 3 of the License, or     *
+// * (at your option) any later version.                                   *
+// *                                                                       *
+// * This program is distributed in the hope that it will be useful,       *
+// * but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+// * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+// * GNU General Public License for more details.                          *
+// *                                                                       *
+// * You should have received a copy of the GNU General Public License     *
+// * along with this program.  If not, see <http://www.gnu.org/licenses/>. *
+// *************************************************************************
+
+use libhid;
+use std::fmt;
+
+
+#[derive(Debug)]
+pub enum Error {
+  HidError(libhid::Error),
+  Error(String),
+}
+
+
+impl From<libhid::Error> for Error {
+  fn from(e: libhid::Error) -> Error {
+    return Error::HidError(e);
+  }
+}
+
+
+impl fmt::Display for Error {
+  fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    match *&self {
+      &Error::HidError(ref e) => return write!(f, "hidapi error: {}", e),
+      &Error::Error(ref e) => return write!(f, "{}", e),
+    }
+  }
+}
diff --git a/nitrocli/src/main.rs b/nitrocli/src/main.rs
index 57e6a7a..bdbfe37 100644
--- a/nitrocli/src/main.rs
+++ b/nitrocli/src/main.rs
@@ -18,7 +18,90 @@
 // *************************************************************************
 
 
+#![deny(missing_docs)]
+
+//! Nitrocli is a program providing a command line interface to certain
+//! commands of the Nitrokey Storage device.
+
+extern crate hid as libhid;
+
+
+mod error;
+mod nitrokey;
+
+use error::Error;
+use std::process;
+use std::result;
+
+type Result<T> = result::Result<T, Error>;
+type NitroFunc = Fn(&mut libhid::Handle) -> Result<()>;
+
+
+/// Find and open the nitrokey device and execute a function on it.
+fn nitrokey_do(function: &NitroFunc) -> Result<()> {
+  let hid = libhid::init()?;
+  // The Manager::find method is plain stupid as it still returns an
+  // iterable. Using it does not help in more concise error handling.
+  for device in hid.devices() {
+    if device.vendor_id() == nitrokey::VID && device.product_id() == nitrokey::PID {
+      return function(&mut device.open()?);
+    }
+  }
+  return Err(Error::Error("Nitrokey device not found".to_string()));
+}
+
+
+/// Open the encrypted volume on the nitrokey.
+fn open() -> Result<()> {
+  return nitrokey_do(&|handle| {
+    println!("Found nitrokey. Opening encrypted volume...");
+    return Ok(());
+  });
+}
+
+
+/// Close the previously opened encrypted volume.
+fn close() -> Result<()> {
+  return nitrokey_do(&|handle| {
+    println!("Found nitrokey. Closing encrypted volume...");
+    return Ok(());
+  });
+}
+
+
+// A macro for generating a match of the different supported commands.
+// Each supplied command is converted into a string and matched against.
+macro_rules! commands {
+  ( $str:expr, [ $( $command:expr), *] ) => {
+    match &*$str.to_string() {
+      $(
+        stringify!($command) => {
+          if let Err(err) = $command() {
+            println!("{}", err);
+            return 1
+          }
+          return 0
+        },
+      )*
+      x => {
+        println!("Invalid command: {}", x);
+        println!("Available commands: {}", stringify!( $($command)* ));
+        return 1
+      },
+    }
+  }
+}
+
+fn run() -> i32 {
+  let argv: Vec<String> = std::env::args().collect();
+  if argv.len() != 2 {
+    println!("Usage: {} <command>", argv[0]);
+    return 1;
+  }
+
+  commands!(&argv[1], [open, close]);
+}
 
 fn main() {
-  println!("Hello, world!");
+  process::exit(run());
 }
diff --git a/nitrocli/src/nitrokey.rs b/nitrocli/src/nitrokey.rs
new file mode 100644
index 0000000..763bc4c
--- /dev/null
+++ b/nitrocli/src/nitrokey.rs
@@ -0,0 +1,24 @@
+// nitrokey.rs
+
+// *************************************************************************
+// * Copyright (C) 2017 Daniel Mueller (deso@posteo.net)                   *
+// *                                                                       *
+// * This program is free software: you can redistribute it and/or modify  *
+// * it under the terms of the GNU General Public License as published by  *
+// * the Free Software Foundation, either version 3 of the License, or     *
+// * (at your option) any later version.                                   *
+// *                                                                       *
+// * This program is distributed in the hope that it will be useful,       *
+// * but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+// * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+// * GNU General Public License for more details.                          *
+// *                                                                       *
+// * You should have received a copy of the GNU General Public License     *
+// * along with this program.  If not, see <http://www.gnu.org/licenses/>. *
+// *************************************************************************
+
+
+// The Nitrokey Storage vendor ID.
+pub const VID: u16 = 0x20A0;
+// The Nitrokey Storage product ID.
+pub const PID: u16 = 0x4109;