well, tests pass now

src/operational_error.rs

@@ -0,0 +1,47 @@
+use crate::ssh::{SshKeyExchangeProcessingError, SshMessageID};
+use thiserror::Error;
+
+#[derive(Debug, Error)]
+pub enum OperationalError {
+    #[error("Configuration error")]
+    ConfigurationError,
+    #[error("Failed to connect to target address")]
+    Connection,
+    #[error("Failed to complete initial read: {0}")]
+    InitialRead(std::io::Error),
+    #[error("SSH banner was not formatted in UTF-8: {0}")]
+    BannerError(std::str::Utf8Error),
+    #[error("Invalid initial SSH versionling line: {line}")]
+    InvalidHeaderLine { line: String },
+    #[error("Error writing initial banner: {0}")]
+    WriteBanner(std::io::Error),
+    #[error("Unexpected disconnect from other side.")]
+    Disconnect,
+    #[error("{message} in unexpected place.")]
+    UnexpectedMessage { message: SshMessageID },
+    #[error("User authorization failed.")]
+    UserAuthFailed,
+    #[error("Request failed.")]
+    RequestFailed,
+    #[error("Failed to open channel.")]
+    OpenChannelFailure,
+    #[error("Other side closed connection.")]
+    OtherClosed,
+    #[error("Other side sent EOF.")]
+    OtherEof,
+    #[error("Channel failed.")]
+    ChannelFailure,
+    #[error("Error in initial handshake: {0}")]
+    KeyxProcessingError(#[from] SshKeyExchangeProcessingError),
+    #[error("Call into random number generator failed: {0}")]
+    RngFailure(#[from] rand::Error),
+    #[error("Invalid port number '{port_string}': {error}")]
+    InvalidPort {
+        port_string: String,
+        error: std::num::ParseIntError,
+    },
+    #[error("Invalid hostname '{0}'")]
+    InvalidHostname(String),
+    #[error("Unable to parse host address")]
+    UnableToParseHostAddress,
+}