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// Copyright (C) 2018-2019 Robin Krahl <robin.krahl@ireas.org>
// SPDX-License-Identifier: MIT
use std::ffi::{CStr, CString};
use std::os::raw::{c_char, c_int};
use libc::{c_void, free};
use rand_core::RngCore;
use rand_os::OsRng;
use crate::error::{Error, LibraryError};
/// Log level for libnitrokey.
///
/// Setting the log level to a lower level enables all output from higher levels too. Currently,
/// only the log levels `Warning`, `DebugL1`, `Debug` and `DebugL2` are actually used.
#[derive(Clone, Copy, Debug, PartialEq)]
pub enum LogLevel {
/// Error messages. Currently not used.
Error,
/// Warning messages.
Warning,
/// Informational messages. Currently not used.
Info,
/// Basic debug messages, especially basic information on the sent and received packets.
DebugL1,
/// Detailed debug messages, especially detailed information on the sent and received packets.
Debug,
/// Very detailed debug messages, especially detailed information about the control flow for
/// device communication (for example function entries and exits).
DebugL2,
}
pub fn owned_str_from_ptr(ptr: *const c_char) -> Result<String, Error> {
unsafe { CStr::from_ptr(ptr) }
.to_str()
.map(String::from)
.map_err(Error::from)
}
pub fn result_from_string(ptr: *const c_char) -> Result<String, Error> {
if ptr.is_null() {
return Err(Error::UnexpectedError);
}
let s = owned_str_from_ptr(ptr)?;
unsafe { free(ptr as *mut c_void) };
// An empty string can both indicate an error or be a valid return value. In this case, we
// have to check the last command status to decide what to return.
if s.is_empty() {
get_last_result().map(|_| s)
} else {
Ok(s)
}
}
pub fn result_or_error<T>(value: T) -> Result<T, Error> {
get_last_result().and(Ok(value))
}
pub fn get_command_result(value: c_int) -> Result<(), Error> {
if value == 0 {
Ok(())
} else {
Err(Error::from(value))
}
}
pub fn get_last_result() -> Result<(), Error> {
get_command_result(unsafe { nitrokey_sys::NK_get_last_command_status() }.into())
}
pub fn get_last_error() -> Error {
match get_last_result() {
Ok(()) => Error::UnexpectedError,
Err(err) => err,
}
}
pub fn generate_password(length: usize) -> Result<Vec<u8>, Error> {
let mut rng = OsRng::new().map_err(|err| Error::RandError(Box::new(err)))?;
let mut data = vec![0u8; length];
rng.fill_bytes(&mut data[..]);
Ok(data)
}
pub fn get_cstring<T: Into<Vec<u8>>>(s: T) -> Result<CString, Error> {
CString::new(s).or_else(|_| Err(LibraryError::InvalidString.into()))
}
impl Into<i32> for LogLevel {
fn into(self) -> i32 {
match self {
LogLevel::Error => 0,
LogLevel::Warning => 1,
LogLevel::Info => 2,
LogLevel::DebugL1 => 3,
LogLevel::Debug => 4,
LogLevel::DebugL2 => 5,
}
}
}
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