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use std::any::Any;
use std::error;
use std::error::Error as StdError;
use std::fmt;
use std::io;
use error::ErrorStack;
use ssl::MidHandshakeSslStream;
/// An SSL error.
#[derive(Debug)]
pub enum Error {
/// The SSL session has been closed by the other end
ZeroReturn,
/// An attempt to read data from the underlying socket returned
/// `WouldBlock`. Wait for read readiness and reattempt the operation.
WantRead(io::Error),
/// An attempt to write data from the underlying socket returned
/// `WouldBlock`. Wait for write readiness and reattempt the operation.
WantWrite(io::Error),
/// The client certificate callback requested to be called again.
WantX509Lookup,
/// An error reported by the underlying stream.
Stream(io::Error),
/// An error in the OpenSSL library.
Ssl(ErrorStack),
}
impl fmt::Display for Error {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
try!(fmt.write_str(self.description()));
if let Some(err) = self.cause() {
write!(fmt, ": {}", err)
} else {
Ok(())
}
}
}
impl error::Error for Error {
fn description(&self) -> &str {
match *self {
Error::ZeroReturn => "The SSL session was closed by the other end",
Error::WantRead(_) => "A read attempt returned a `WouldBlock` error",
Error::WantWrite(_) => "A write attempt returned a `WouldBlock` error",
Error::WantX509Lookup => "The client certificate callback requested to be called again",
Error::Stream(_) => "The underlying stream reported an error",
Error::Ssl(_) => "The OpenSSL library reported an error",
}
}
fn cause(&self) -> Option<&error::Error> {
match *self {
Error::WantRead(ref err) => Some(err),
Error::WantWrite(ref err) => Some(err),
Error::Stream(ref err) => Some(err),
Error::Ssl(ref err) => Some(err),
_ => None,
}
}
}
impl From<ErrorStack> for Error {
fn from(e: ErrorStack) -> Error {
Error::Ssl(e)
}
}
/// An error or intermediate state after a TLS handshake attempt.
#[derive(Debug)]
pub enum HandshakeError<S> {
/// Setup failed.
SetupFailure(ErrorStack),
/// The handshake failed.
Failure(MidHandshakeSslStream<S>),
/// The handshake was interrupted midway through. This error will never be returned for blocking streams.
// FIXME change to WouldBlock
Interrupted(MidHandshakeSslStream<S>),
}
impl<S: Any + fmt::Debug> StdError for HandshakeError<S> {
fn description(&self) -> &str {
match *self {
HandshakeError::SetupFailure(_) => "stream setup failed",
HandshakeError::Failure(_) => "the handshake failed",
HandshakeError::Interrupted(_) => "the handshake was interrupted",
}
}
fn cause(&self) -> Option<&StdError> {
match *self {
HandshakeError::SetupFailure(ref e) => Some(e),
HandshakeError::Failure(ref s) |
HandshakeError::Interrupted(ref s) => Some(s.error()),
}
}
}
impl<S: Any + fmt::Debug> fmt::Display for HandshakeError<S> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
try!(f.write_str(StdError::description(self)));
match *self {
HandshakeError::SetupFailure(ref e) => try!(write!(f, ": {}", e)),
HandshakeError::Failure(ref s) |
HandshakeError::Interrupted(ref s) => {
try!(write!(f, ": {}", s.error()));
if let Some(err) = s.ssl().verify_result() {
try!(write!(f, ": {}", err));
}
}
}
Ok(())
}
}
impl<S> From<ErrorStack> for HandshakeError<S> {
fn from(e: ErrorStack) -> HandshakeError<S> {
HandshakeError::SetupFailure(e)
}
}
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