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Robin Müller
2024-06-01 12:02:34 +02:00
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[package]
name = "libcsp"
version = "0.1.0"
edition = "2021"
authors = ["Robin Mueller <muellerr@irs.uni-stuttgart.de>"]
description = "Safe and ergonomic Rust API for libcsp on top on libcsp-sys"
homepage = "https://egit.irs.uni-stuttgart.de/rust/libcsp-rust"
repository = "https://egit.irs.uni-stuttgart.de/rust/libcsp-rust"
license = "Apache-2.0"
keywords = ["no-std", "space", "aerospace", "ffi", "csp"]
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
categories = ["aerospace", "external-ffi-bindings", "no-std", "hardware-support", "embedded"]
[dependencies]
bitflags = "2"
num_enum = "0.7"
libc = "0.2"

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This software contains code developed at the University of Stuttgart's Institute of Space Systems.

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libcsp-rust
========
This crate provides Rust FFI bindings and a Rusty API for the [`libcsp` library](https://github.com/libcsp/libcsp).
You can find some more high-level information and examples in the
[main workspace](https://egit.irs.uni-stuttgart.de/rust/libcsp-rust).
The API documentation should provide all additional information required to use this library.
## Compile-time configuration of the `libcsp-rust` library
The `libcsp-rust` library requires some compile-time configuration file to be included to work
properly. You can see an example version of the file for the workspace
[here](https://egit.irs.uni-stuttgart.de/rust/libcsp-rust/src/branch/main/examples/autoconfig.rs).
The user has to provide the path to a directory containing this `autoconfig.rs` file using the
`CSP_CONFIG_DIR` environmental variable.
It is recommended to read the [main workspace README](https://egit.irs.uni-stuttgart.de/rust/libcsp-rust)
for more information to make the generation and specification of this auto-configuration file
as conveniently and easy as possible.

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#![no_std]
#[cfg(feature = "alloc")]
extern crate alloc;
#[cfg(any(feature = "std", test))]
extern crate std;
pub mod config;
pub mod ffi;
use core::time::Duration;
use num_enum::{IntoPrimitive, TryFromPrimitive};
use bitflags::bitflags;
use ffi::{csp_conn_s, csp_packet_s, csp_socket_s};
use libcsp_sys as ffi;
#[derive(Debug, PartialEq, Eq, Copy, Clone)]
pub enum ReservedPort {
Cmp = 0,
Ping = 1,
Ps = 2,
Memfree = 3,
Reboot = 4,
BufFree = 5,
Uptime = 6,
}
#[derive(Debug, PartialEq, Eq, Copy, Clone, TryFromPrimitive, IntoPrimitive)]
#[repr(i32)]
pub enum CspError {
None = 0,
NoMem = -1,
Inval = -2,
TimedOut = -3,
Used = -4,
NotSup = -5,
Busy = -6,
Already = -7,
Reset = -8,
NoBufs = -9,
Tx = -10,
Driver = -11,
Again = -12,
NoSys = -38,
Hmac = -100,
Crc32 = -102,
Sfp = -103,
}
/// Listen on all ports, primarily used with [csp_bind]
pub const CSP_ANY: u8 = 255;
pub const CSP_LOOPBACK: u16 = 0;
bitflags! {
pub struct SocketFlags: u32 {
const NONE = 0x0000;
/// RDP required.
const RDPREQ = 0x0001;
/// RDP prohibited.
const RDPPROHIB = 0x0002;
/// HMAC required
const HMACREQ = 0x0004;
/// HMAC prohibited.
const HMACPROHIB = 0x0008;
/// CRC32 required.
const CRC32REQ = 0x0040;
const CRC32PROHIB = 0x0080;
const CONN_LESS = 0x0100;
/// Copy opts from incoming packets. Only applies to [csp_sendto_reply]
const SAME = 0x8000;
// The source may set any bits
const _ = !0;
}
}
bitflags! {
pub struct ConnectOpts: u32 {
const NONE = SocketFlags::NONE.bits();
const RDP = SocketFlags::RDPREQ.bits();
const NORDP = SocketFlags::RDPPROHIB.bits();
const HMAC = SocketFlags::HMACREQ.bits();
const NOHMAC = SocketFlags::HMACPROHIB.bits();
const CRC32 = SocketFlags::CRC32REQ.bits();
const NOCRC32 = SocketFlags::CRC32PROHIB.bits();
const SAME = SocketFlags::SAME.bits();
// The source may set any bits
const _ = !0;
}
}
#[derive(Debug, Copy, Clone, PartialEq, Eq, TryFromPrimitive, IntoPrimitive)]
#[repr(u8)]
pub enum ConnState {
Closed = 0,
Open = 1,
}
#[derive(Debug, Copy, Clone, PartialEq, Eq, TryFromPrimitive, IntoPrimitive)]
#[repr(u8)]
pub enum ConnType {
Client = 0,
Server = 1,
}
#[derive(Debug, Copy, Clone, PartialEq, Eq, TryFromPrimitive, IntoPrimitive)]
#[repr(u32)]
pub enum RdpState {
Closed = 0,
SynSent = 1,
SynRcvd = 2,
Open = 3,
CloseWait = 4,
}
#[derive(Debug, PartialEq, Eq, Copy, Clone, TryFromPrimitive, IntoPrimitive)]
#[repr(u8)]
pub enum MsgPriority {
Critical = 0,
High = 1,
Normal = 2,
Low = 3,
}
pub struct CspPacket(pub csp_packet_s);
pub struct CspPacketRef(*mut csp_packet_s);
pub struct CspPacketMut(*mut csp_packet_s);
impl From<CspPacketMut> for CspPacketRef {
fn from(value: CspPacketMut) -> Self {
Self(value.0)
}
}
impl CspPacketRef {
pub fn packet_data(&self) -> &[u8] {
unsafe { &(*self.0).packet_data_union.data[..self.packet_length()] }
}
pub fn whole_data(&self) -> &[u8; ffi::CSP_BUFFER_SIZE] {
unsafe { &(*self.0).packet_data_union.data }
}
pub fn packet_length(&self) -> usize {
unsafe { (*self.0).length.into() }
}
pub fn inner(&self) -> *const csp_packet_s {
self.0
}
}
pub struct CspPacketRefGuard(Option<CspPacketRef>);
impl Drop for CspPacketRefGuard {
fn drop(&mut self) {
if let Some(packet) = self.0.take() {
csp_buffer_free(packet)
}
}
}
impl CspPacketRefGuard {
/// Take the packet out of the guard, preventing it from being freed.
pub fn take(mut self) -> CspPacketRef {
self.0.take().unwrap()
}
}
impl AsRef<CspPacketRef> for CspPacketRefGuard {
fn as_ref(&self) -> &CspPacketRef {
self.0.as_ref().unwrap()
}
}
impl CspPacketMut {
pub fn packet_data(&self) -> &[u8] {
unsafe { &(*self.0).packet_data_union.data[..self.packet_length()] }
}
pub fn whole_data(&self) -> &[u8; ffi::CSP_BUFFER_SIZE] {
unsafe { &(*self.0).packet_data_union.data }
}
pub fn packet_length(&self) -> usize {
unsafe { (*self.0).length.into() }
}
pub fn inner(&self) -> *const csp_packet_s {
self.0
}
pub fn whole_data_mut(&mut self) -> &mut [u8; ffi::CSP_BUFFER_SIZE] {
unsafe { &mut (*self.0).packet_data_union.data }
}
pub fn set_data(&mut self, data: &[u8]) -> bool {
if data.len() > self.whole_data().len() {
return false;
}
self.whole_data_mut()[0..data.len()].copy_from_slice(data);
unsafe {
(*self.0).length = data.len() as u16;
}
true
}
pub fn inner_mut(&self) -> *mut csp_packet_s {
self.0
}
}
impl CspPacket {
pub fn new() -> Self {
Self::default()
}
}
impl Default for CspPacket {
fn default() -> Self {
Self(csp_packet_s {
packet_info: Default::default(),
length: Default::default(),
id: Default::default(),
next: core::ptr::null_mut(),
header: Default::default(),
packet_data_union: Default::default(),
})
}
}
#[derive(Default)]
pub struct CspSocket(pub csp_socket_s);
impl CspSocket {
pub fn inner_as_mut_ptr(&mut self) -> *mut csp_socket_s {
&mut self.0
}
}
/// Rust wrapper for [ffi::csp_init]. Initialize the CSP stack.
///
/// # Safety
///
/// - You must call this function only once.
pub unsafe fn csp_init() {
// SAFETY: FFI call
unsafe {
ffi::csp_init();
}
}
/// Rust wrapper for [ffi::csp_bind].
pub fn csp_bind(socket: &mut CspSocket, port: u8) {
// SAFETY: FFI call
unsafe {
ffi::csp_bind(socket.inner_as_mut_ptr(), port);
}
}
/// Rust wrapper for [ffi::csp_listen].
pub fn csp_listen(socket: &mut CspSocket, backlog: usize) {
// SAFETY: FFI call
unsafe {
ffi::csp_listen(socket.inner_as_mut_ptr(), backlog);
}
}
/// Rust wrapper for [ffi::csp_route_work].
pub fn csp_route_work_raw() -> i32 {
unsafe { ffi::csp_route_work() }
}
/// Rust wrapper for [ffi::csp_route_work] which also converts errors to the [CspError] type.
/// This function will panic if the returned error type is not among the known values of
/// [CspError].
///
/// [csp_route_work_raw] can be used if this is not acceptable.
pub fn csp_route_work() -> Result<(), CspError> {
let result = unsafe { ffi::csp_route_work() };
if result == CspError::None as i32 {
return Ok(());
}
Err(CspError::try_from(result)
.unwrap_or_else(|_| panic!("unexpected error value {} from csp_route_work", result)))
}
#[derive(Debug, Copy, Clone)]
pub struct CspConnRef(*mut csp_conn_s);
pub struct CspConnGuard(pub CspConnRef);
impl Drop for CspConnGuard {
fn drop(&mut self) {
csp_close(self.0);
}
}
impl AsRef<CspConnRef> for CspConnGuard {
fn as_ref(&self) -> &CspConnRef {
&self.0
}
}
impl AsMut<CspConnRef> for CspConnGuard {
fn as_mut(&mut self) -> &mut CspConnRef {
&mut self.0
}
}
pub fn csp_accept_guarded(socket: &mut CspSocket, timeout: Duration) -> Option<CspConnGuard> {
Some(CspConnGuard(csp_accept(socket, timeout)?))
}
/// Rust wrapper for [ffi::csp_accept].
pub fn csp_accept(socket: &mut CspSocket, timeout: Duration) -> Option<CspConnRef> {
let timeout_millis = timeout.as_millis();
if timeout_millis > u32::MAX as u128 {
return None;
}
Some(CspConnRef(unsafe {
let addr = ffi::csp_accept(socket.inner_as_mut_ptr(), timeout_millis as u32);
if addr.is_null() {
return None;
}
addr
}))
}
/// Rust wrapper for [ffi::csp_read].
pub fn csp_read(conn: &mut CspConnRef, timeout: Duration) -> Option<CspPacketRef> {
let timeout_millis = timeout.as_millis();
if timeout_millis > u32::MAX as u128 {
return None;
}
let opt_packet = unsafe { ffi::csp_read(conn.0, timeout_millis as u32) };
if opt_packet.is_null() {
return None;
}
// SAFETY: FFI pointer.
Some(CspPacketRef(unsafe { &mut *opt_packet }))
}
/// Rust wrapper for [ffi::csp_read] which returns a guarded packet reference. This packet
/// will cleaned up automatically with [csp_buffer_free] on drop.
pub fn csp_read_guarded(conn: &mut CspConnRef, timeout: Duration) -> Option<CspPacketRefGuard> {
Some(CspPacketRefGuard(Some(csp_read(conn, timeout)?)))
}
/// Rust wrapper for [ffi::csp_conn_dport].
pub fn csp_conn_dport(conn: &CspConnRef) -> i32 {
// SAFETY: FFI call.
unsafe { ffi::csp_conn_dport(conn.0) }
}
pub fn csp_service_handler(packet: CspPacketRef) {
// SAFETY: FFI call.
unsafe { ffi::csp_service_handler(&mut *packet.0) }
}
/// Rust wrapper for [ffi::csp_close].
pub fn csp_close(conn: CspConnRef) -> i32 {
// SAFETY: FFI call.
unsafe { ffi::csp_close(conn.0) }
}
/// Rust wrapper for [ffi::csp_ping], returns the result code directly.
pub fn csp_ping_raw(node: u16, timeout: Duration, size: usize, opts: SocketFlags) -> i32 {
// SAFETY: FFI call.
unsafe {
ffi::csp_ping(
node,
timeout.as_millis() as u32,
size as u32,
opts.bits() as u8,
)
}
}
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub struct PingError;
/// Rust wrapper for [ffi::csp_ping].
pub fn csp_ping(
node: u16,
timeout: Duration,
size: usize,
opts: SocketFlags,
) -> Result<Duration, PingError> {
let result = csp_ping_raw(node, timeout, size, opts);
if result < 0 {
return Err(PingError);
}
Ok(Duration::from_millis(result as u64))
}
/// Rust wrapper for [ffi::csp_reboot].
pub fn csp_reboot(node: u16) {
// SAFETY: FFI call.
unsafe { ffi::csp_reboot(node) }
}
/// Rust wrapper for [ffi::csp_connect].
pub fn csp_connect(
prio: MsgPriority,
dst: u16,
dst_port: u8,
timeout: Duration,
opts: ConnectOpts,
) -> Option<CspConnRef> {
// SAFETY: FFI call.
let conn = unsafe {
ffi::csp_connect(
prio as u8,
dst,
dst_port,
timeout.as_millis() as u32,
opts.bits(),
)
};
if conn.is_null() {
return None;
}
// SAFETY: We checked that the pointer is valid.
Some(CspConnRef(conn))
}
/// Rust wrapper for [ffi::csp_connect] which returns a guard structure. The connection will be
/// be closed automatically when the guard structure is dropped.
pub fn csp_connect_guarded(
prio: MsgPriority,
dst: u16,
dst_port: u8,
timeout: Duration,
opts: ConnectOpts,
) -> Option<CspConnGuard> {
Some(CspConnGuard(csp_connect(
prio, dst, dst_port, timeout, opts,
)?))
}
/// Rust wrapper for [ffi::csp_buffer_get].
pub fn csp_buffer_get() -> Option<CspPacketMut> {
let packet_ref = unsafe {
// The size argument is unused
ffi::csp_buffer_get(0)
};
if packet_ref.is_null() {
return None;
}
// SAFETY: We checked that the pointer is valid.
Some(CspPacketMut(unsafe { &mut *packet_ref }))
}
/// Rust wrapper for [ffi::csp_send].
pub fn csp_send(conn: &mut CspConnRef, packet: impl Into<CspPacketRef>) {
// SAFETY: FFI call.
unsafe { ffi::csp_send(conn.0, packet.into().0) }
}
/// Rust wrapper for [ffi::csp_conn_print_table].
pub fn csp_conn_print_table() {
// SAFETY: FFI call.
unsafe { ffi::csp_conn_print_table() }
}
/// Rust wrapper for [ffi::csp_iflist_print].
pub fn csp_iflist_print() {
// SAFETY: FFI call.
unsafe { ffi::csp_iflist_print() }
}
/// Rust wrapper for [ffi::csp_buffer_free].
pub fn csp_buffer_free(packet: impl Into<CspPacketRef>) {
// SAFETY: FFI call and the Rust type system actually ensure the correct type
// is free'd here, while also taking the packet by value.
unsafe { ffi::csp_buffer_free(packet.into().0 as *mut libc::c_void) }
}
/// Rust wrapper for [ffi::csp_transaction_persistent].
///
/// # Parameters
///
/// * `in_len`: Use [None] if the length is unknown, and the expected reply length otherwise.
///
/// # Returns
///
/// 1 or reply size on success, 0 otherwise.
pub fn csp_transaction_persistent(
conn: &mut CspConnRef,
timeout: Duration,
out_data: &[u8],
in_data: &mut [u8],
in_len: Option<usize>,
) -> i32 {
unsafe {
ffi::csp_transaction_persistent(
conn.0,
timeout.as_millis() as u32,
out_data.as_ptr() as *const core::ffi::c_void,
out_data.len() as i32,
in_data.as_ptr() as *mut core::ffi::c_void,
in_len.map(|v| v as i32).unwrap_or(-1),
)
}
}

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pub const CSP_CONN_RXQUEUE_LEN: usize = 16;
pub const CSP_QFIFO_LEN: usize = 15;
pub const CSP_PORT_MAX_BIND: usize = 16;
pub const CSP_CONN_MAX: usize = 8;
pub const CSP_BUFFER_SIZE: usize = 256;
pub const CSP_BUFFER_COUNT: usize = 15;
pub const CSP_RDP_MAX_WINDOW: usize = 5;
pub const CSP_RTABLE_SIZE: usize = 10;