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Merge pull request #1082 from sfackler/error-lib 

Add a crate to define custom error libraries
This commit is contained in:
Steven Fackler 2019-03-14 11:52:29 -07:00 committed by GitHub
parent 546405dc58 27d5786390
commit e49b54150e
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8 changed files with 596 additions and 1 deletions
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10
.circleci/config.yml
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@ -129,6 +129,12 @@ jobs:
--manifest-path=systest/Cargo.toml \
<<# parameters.vendored >>--features vendored<</ parameters.vendored >> \
--target << parameters.target >>
- run: |
cargo test \
--manifest-path=openssl-errors/Cargo.toml \
<<# parameters.vendored >>--features openssl-sys/vendored<</ parameters.vendored >> \
--target << parameters.target >> \
<<# parameters.no_run >>--no-run<</ parameters.no_run >>
- run: |
ulimit -c unlimited
export PATH=$OPENSSL_DIR/bin:$PATH
@ -176,6 +182,10 @@ jobs:
cargo run \
--manifest-path=systest/Cargo.toml \
<<# parameters.vendored >> --features vendored <</ parameters.vendored >>
- run: |
cargo test \
--manifest-path=openssl-errors/Cargo.toml \
<<# parameters.vendored >> --features openssl-sys/vendored <</ parameters.vendored >>
- run: |
PATH=/usr/local/opt/openssl/bin:$PATH
cargo test \

7
Cargo.toml
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@ -1,2 +1,7 @@
[workspace]
members = ["openssl", "openssl-sys", "systest"]
members = [
"openssl",
"openssl-errors",
"openssl-sys",
"systest",
]

18
openssl-errors/Cargo.toml Normal file
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@ -0,0 +1,18 @@
[package]
name = "openssl-errors"
version = "0.1.0"
authors = ["Steven Fackler <sfackler@gmail.com>"]
edition = "2018"
license = "MIT/Apache-2.0"
description = "Custom error library support for the openssl crate."
repository = "https://github.com/sfackler/rust-openssl"
readme = "README.md"
categories = ["api-bindings"]
[dependencies]
libc = "0.2"
openssl-sys = { version = "0.9.42", path = "../openssl-sys" }
[dev-dependencies]
openssl = { version = "0.10.19", path = "../openssl" }

202
openssl-errors/LICENSE-APACHE Normal file
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@ -0,0 +1,202 @@
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19
openssl-errors/LICENSE-MIT Normal file
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@ -0,0 +1,19 @@
Copyright (c) 2019 Steven Fackler
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1
openssl-errors/README.md Symbolic link
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@ -0,0 +1 @@
../README.md

286
openssl-errors/src/lib.rs Normal file
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@ -0,0 +1,286 @@
//! Custom error library support for the `openssl` crate.
//!
//! OpenSSL allows third-party libraries to integrate with its error API. This crate provides a safe interface to that.
//!
//! # Examples
//!
//! ```
//! use openssl_errors::{openssl_errors, put_error};
//! use openssl::error::Error;
//!
//! // Errors are organized at the top level into "libraries". The
//! // openssl_errors! macro can define these.
//! //
//! // Libraries contain a set of functions and reasons. The library itself,
//! // its functions, and its definitions all all have an associated message
//! // string. This string is what's shown in OpenSSL errors.
//! //
//! // The macro creates a type for each library with associated constants for
//! // its functions and reasons.
//! openssl_errors! {
//! pub library MyLib("my cool library") {
//! functions {
//! FIND_PRIVATE_KEY("find_private_key");
//! }
//!
//! reasons {
//! IO_ERROR("IO error");
//! BAD_PASSWORD("invalid private key password");
//! }
//! }
//! }
//!
//! // The put_error! macro pushes errors onto the OpenSSL error stack.
//! put_error!(MyLib::FIND_PRIVATE_KEY, MyLib::BAD_PASSWORD);
//!
//! // Prints `error:80001002:my cool library:find_private_key:invalid private key password:src/lib.rs:27:`
//! println!("{}", Error::get().unwrap());
//!
//! // You can also optionally attach an extra string of context using the
//! // standard Rust format syntax.
//! let tries = 2;
//! put_error!(MyLib::FIND_PRIVATE_KEY, MyLib::IO_ERROR, "tried {} times", tries);
//!
//! // Prints `error:80001001:my cool library:find_private_key:IO error:src/lib.rs:34:tried 2 times`
//! println!("{}", Error::get().unwrap());
//! ```
#![warn(missing_docs)]
#![doc(html_root_url = "https://docs.rs/openssl-errors/0.1")]
use libc::{c_char, c_int};
use std::borrow::Cow;
use std::marker::PhantomData;
use std::ptr;
#[doc(hidden)]
pub mod export {
pub use libc::{c_char, c_int};
pub use openssl_sys::{
init, ERR_get_next_error_library, ERR_load_strings, ERR_PACK, ERR_STRING_DATA,
};
pub use std::borrow::Cow;
pub use std::option::Option;
pub use std::ptr::null;
pub use std::sync::Once;
}
/// An OpenSSL error library.
pub trait Library {
/// Returns the ID assigned to this library by OpenSSL.
fn id() -> c_int;
}
/// A function declaration, parameterized by its error library.
pub struct Function<T>(c_int, PhantomData<T>);
impl<T> Function<T> {
/// Creates a function from its raw identifier.
#[inline]
pub const fn from_raw(raw: c_int) -> Function<T> {
Function(raw, PhantomData)
}
/// Returns the function's raw identifier.
#[inline]
pub const fn as_raw(&self) -> c_int {
self.0
}
}
/// A reason declaration, parameterized by its error library.
pub struct Reason<T>(c_int, PhantomData<T>);
impl<T> Reason<T> {
/// Creates a reason from its raw identifier.
#[inline]
pub const fn from_raw(raw: c_int) -> Reason<T> {
Reason(raw, PhantomData)
}
/// Returns the reason's raw identifier.
#[inline]
pub const fn as_raw(&self) -> c_int {
self.0
}
}
/// This is not considered part of this crate's public API. It is subject to change at any time.
///
/// # Safety
///
/// `file` and `message` must be null-terminated.
#[doc(hidden)]
pub unsafe fn __put_error<T>(
func: Function<T>,
reason: Reason<T>,
file: &'static str,
line: u32,
message: Option<Cow<'static, str>>,
) where
T: Library,
{
openssl_sys::ERR_put_error(
T::id(),
func.as_raw(),
reason.as_raw(),
file.as_ptr() as *const c_char,
line as c_int,
);
let data = match message {
Some(Cow::Borrowed(s)) => Some((s.as_ptr() as *const c_char as *mut c_char, 0)),
Some(Cow::Owned(s)) => {
let ptr = openssl_sys::CRYPTO_malloc(
s.len() as _,
concat!(file!(), "\0").as_ptr() as *const c_char,
line!() as c_int,
) as *mut c_char;
if ptr.is_null() {
None
} else {
ptr::copy_nonoverlapping(s.as_ptr(), ptr as *mut u8, s.len());
Some((ptr, openssl_sys::ERR_TXT_MALLOCED))
}
}
None => None,
};
if let Some((ptr, flags)) = data {
openssl_sys::ERR_set_error_data(ptr, flags | openssl_sys::ERR_TXT_STRING);
}
}
/// Pushes an error onto the OpenSSL error stack.
///
/// A function and reason are required, and must be associated with the same error library. An additional formatted
/// message string can also optionally be provided.
#[macro_export]
macro_rules! put_error {
($function:expr, $reason:expr) => {
unsafe {
$crate::__put_error(
$function,
$reason,
concat!(file!(), "\0"),
line!(),
$crate::export::Option::None,
);
}
};
($function:expr, $reason:expr, $message:expr) => {
unsafe {
$crate::__put_error(
$function,
$reason,
concat!(file!(), "\0"),
line!(),
$crate::export::Option::Some($crate::export::Cow::Borrowed(
concat!($message, "\0"),
)),
);
}
};
($function:expr, $reason:expr, $message:expr, $($args:tt)*) => {
unsafe {
$crate::__put_error(
$function,
$reason,
concat!(file!(), "\0"),
line!(),
$crate::export::Option::Some($crate::export::Cow::Owned(
format!(concat!($message, "\0"), $($args)*)),
),
);
}
};
}
/// Defines custom OpenSSL error libraries.
///
/// The created libraries can be used with the `put_error!` macro to create custom OpenSSL errors.
#[macro_export]
macro_rules! openssl_errors {
($(
$(#[$lib_attr:meta])*
$lib_vis:vis library $lib_name:ident($lib_str:expr) {
functions {
$(
$(#[$func_attr:meta])*
$func_name:ident($func_str:expr);
)*
}
reasons {
$(
$(#[$reason_attr:meta])*
$reason_name:ident($reason_str:expr);
)*
}
}
)*) => {$(
$(#[$lib_attr])*
$lib_vis enum $lib_name {}
impl $crate::Library for $lib_name {
fn id() -> $crate::export::c_int {
static INIT: $crate::export::Once = $crate::export::Once::new();
static mut LIB_NUM: $crate::export::c_int = 0;
static mut STRINGS: [
$crate::export::ERR_STRING_DATA;
2 + $crate::openssl_errors!(@count $($func_name;)* $($reason_name;)*)
] = [
$crate::export::ERR_STRING_DATA {
error: 0,
string: concat!($lib_str, "\0").as_ptr() as *const $crate::export::c_char,
},
$(
$crate::export::ERR_STRING_DATA {
error: $crate::export::ERR_PACK(0, $lib_name::$func_name.as_raw(), 0),
string: concat!($func_str, "\0").as_ptr() as *const $crate::export::c_char,
},
)*
$(
$crate::export::ERR_STRING_DATA {
error: $crate::export::ERR_PACK(0, 0, $lib_name::$reason_name.as_raw()),
string: concat!($reason_str, "\0").as_ptr() as *const $crate::export::c_char,
},
)*
$crate::export::ERR_STRING_DATA {
error: 0,
string: $crate::export::null(),
}
];
unsafe {
INIT.call_once(|| {
$crate::export::init();
LIB_NUM = $crate::export::ERR_get_next_error_library();
STRINGS[0].error = $crate::export::ERR_PACK(LIB_NUM, 0, 0);
$crate::export::ERR_load_strings(LIB_NUM, STRINGS.as_mut_ptr());
});
LIB_NUM
}
}
}
impl $lib_name {
$crate::openssl_errors!(@func_consts $lib_name; 1; $($(#[$func_attr])* $func_name;)*);
$crate::openssl_errors!(@reason_consts $lib_name; 1; $($(#[$reason_attr])* $reason_name;)*);
}
)*};
(@func_consts $lib_name:ident; $n:expr; $(#[$attr:meta])* $name:ident; $($tt:tt)*) => {
$(#[$attr])*
pub const $name: $crate::Function<$lib_name> = $crate::Function::from_raw($n);
$crate::openssl_errors!(@func_consts $lib_name; $n + 1; $($tt)*);
};
(@func_consts $lib_name:ident; $n:expr;) => {};
(@reason_consts $lib_name:ident; $n:expr; $(#[$attr:meta])* $name:ident; $($tt:tt)*) => {
$(#[$attr])*
pub const $name: $crate::Reason<$lib_name> = $crate::Reason::from_raw($n);
$crate::openssl_errors!(@reason_consts $lib_name; $n + 1; $($tt)*);
};
(@reason_consts $lib_name:ident; $n:expr;) => {};
(@count $i:ident; $($tt:tt)*) => {
1 + $crate::openssl_errors!(@count $($tt)*)
};
(@count) => { 0 };
}

54
openssl-errors/tests/test.rs Normal file
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@ -0,0 +1,54 @@
use openssl::error::Error;
openssl_errors::openssl_errors! {
library Test("test library") {
functions {
FOO("function foo");
BAR("function bar");
}
reasons {
NO_MILK("out of milk");
NO_BACON("out of bacon");
}
}
}
#[test]
fn basic() {
openssl_errors::put_error!(Test::FOO, Test::NO_MILK);
let error = Error::get().unwrap();
assert_eq!(error.library().unwrap(), "test library");
assert_eq!(error.function().unwrap(), "function foo");
assert_eq!(error.reason().unwrap(), "out of milk");
assert_eq!(error.file(), "openssl-errors/tests/test.rs");
assert_eq!(error.line(), 19);
assert_eq!(error.data(), None);
}
#[test]
fn static_data() {
openssl_errors::put_error!(Test::BAR, Test::NO_BACON, "foobar");
let error = Error::get().unwrap();
assert_eq!(error.library().unwrap(), "test library");
assert_eq!(error.function().unwrap(), "function bar");
assert_eq!(error.reason().unwrap(), "out of bacon");
assert_eq!(error.file(), "openssl-errors/tests/test.rs");
assert_eq!(error.line(), 32);
assert_eq!(error.data(), Some("foobar"));
}
#[test]
fn dynamic_data() {
openssl_errors::put_error!(Test::BAR, Test::NO_MILK, "hello {}", "world");
let error = Error::get().unwrap();
assert_eq!(error.library().unwrap(), "test library");
assert_eq!(error.function().unwrap(), "function bar");
assert_eq!(error.reason().unwrap(), "out of milk");
assert_eq!(error.file(), "openssl-errors/tests/test.rs");
assert_eq!(error.line(), 45);
assert_eq!(error.data(), Some("hello world"));
}