cli: add status command

Provides equivalent functionality to `yubico-piv-tool`

src/cccid.rs

@@ -32,7 +32,8 @@
 
 use crate::{error::Error, yubikey::YubiKey};
 use getrandom::getrandom;
-use std::fmt::{self, Debug};
+use std::fmt::{self, Debug, Display};
+use subtle_encoding::hex;
 
 /// CCCID size
 pub const CCCID_SIZE: usize = 14;
@@ -116,3 +117,13 @@ impl Debug for CCC {
         write!(f, "CCC({:?})", &self.0[..])
     }
 }
+
+impl Display for CCC {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(
+            f,
+            "{}",
+            String::from_utf8(hex::encode(&self.0[..])).unwrap()
+        )
+    }
+}

src/chuid.rs

@@ -32,7 +32,8 @@
 
 use crate::{error::Error, yubikey::YubiKey};
 use getrandom::getrandom;
-use std::fmt::{self, Debug};
+use std::fmt::{self, Debug, Display};
+use subtle_encoding::hex;
 
 /// CHUID size
 pub const CHUID_SIZE: usize = 59;
@@ -149,6 +150,16 @@ impl CHUID {
     }
 }
 
+impl Display for CHUID {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(
+            f,
+            "{}",
+            String::from_utf8(hex::encode(&self.0[..])).unwrap()
+        )
+    }
+}
+
 impl Debug for CHUID {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         write!(f, "CHUID({:?})", &self.0[..])

src/lib.rs

@@ -156,7 +156,13 @@ pub mod settings;
 mod transaction;
 pub mod yubikey;
 
-pub use self::{error::Error, key::Key, mgm::MgmKey, readers::Readers, yubikey::YubiKey};
+pub use self::{
+    error::Error,
+    key::Key,
+    mgm::MgmKey,
+    readers::Readers,
+    yubikey::{Serial, YubiKey},
+};
 
 /// Object identifiers
 pub type ObjectId = u32;

src/yubikey.rs

@@ -43,6 +43,7 @@ use pcsc::Card;
 use std::{
     convert::TryFrom,
     fmt::{self, Display},
+    str::FromStr,
 };
 
 #[cfg(feature = "untested")]
@@ -103,6 +104,14 @@ impl From<Serial> for u32 {
     }
 }
 
+impl FromStr for Serial {
+    type Err = Error;
+
+    fn from_str(s: &str) -> Result<Self, Error> {
+        u32::from_str(s).map(Serial).map_err(|_| Error::ParseError)
+    }
+}
+
 impl Display for Serial {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         write!(f, "{}", self.0)
@@ -350,7 +359,6 @@ impl YubiKey {
     }
 
     /// Get the number of PIN retries
-    #[cfg(feature = "untested")]
     pub fn get_pin_retries(&mut self) -> Result<u8, Error> {
         let txn = self.begin_transaction()?;