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src/frame.rs 80ef6c0d5850400a3372eb956a7a6aa10fc9f66d (80ef6c0d) Text, 5.63 KB
T8b949e//! Frame protocol — wire-compatible with the Python implementation.
T8b949e//!
T8b949e//! All TCP sessions are multiplexed over a single RNS link. Each session gets
T8b949e//! a unique `session_id`. Data is exchanged as frames:
T8b949e//!
T8b949e//! ```text
T8b949e//! [1 byte type][4 bytes session_id][2 bytes payload length][payload]
T8b949e//! ```
Tff7b72use Te6edf3std::Te6edf3fmtTb4b4b4;
Tff7b72use Te6edf3clap::Te6edf3error::Te6edf3ErrorFormatterTb4b4b4;
Tff7b72use Te6edf3log::Tb4b4b4{Te6edf3errorTb4b4b4, Te6edf3infoTb4b4b4, Te6edf3warnTb4b4b4}Tb4b4b4;
Tff7b72use Tff7b72crate::Te6edf3frame::Te6edf3FrameDecodeState::Tb4b4b4{Te6edf3DecodingFailedTb4b4b4, Te6edf3MoreDataRequiredTb4b4b4}Tb4b4b4;
T8b949e// ---------------------------------------------------------------------------
T8b949e// Frame types and constants
T8b949e// ---------------------------------------------------------------------------
T8b949e/// Frame header size: 1 (type) + 4 (session_id) + 2 (payload length) = 7
Tff7b72pub Tff7b72const Te6edf3HDR_SIZE: Tffa657usize Tff7b72= T79c0ff7Tb4b4b4;
Tff7b72#[Tff7b72derive(Debug, Clone, Copy, PartialEq, Eq)Tff7b72]
Tff7b72#[Tff7b72repr(u8)Tff7b72]
Tff7b72pub Tff7b72enum T56d364FrameType Tb4b4b4{
T8b949e/// Client requests to open a connection to host:port
Te6edf3Connect Tff7b72= T79c0ff0x01Tb4b4b4,
T8b949e/// Server confirms the connection succeeded
Te6edf3ConnectOk Tff7b72= T79c0ff0x02Tb4b4b4,
T8b949e/// Server reports a connection error (payload = UTF-8 reason)
Te6edf3ConnectErr Tff7b72= T79c0ff0x03Tb4b4b4,
T8b949e/// Bidirectional data transfer
Te6edf3Data Tff7b72= T79c0ff0x04Tb4b4b4,
T8b949e/// Either side closes the session
Te6edf3Close Tff7b72= T79c0ff0x05Tb4b4b4,
Tb4b4b4}
Tff7b72impl Te6edf3FrameType Tb4b4b4{
Tff7b72pub Tff7b72fn Td2a8fffrom_u8Tb4b4b4(Te6edf3v: Tffa657u8Tb4b4b4) -> Tffa657OptionTff7b72<Tff7b72SelfTff7b72> Tb4b4b4{
Tff7b72match Te6edf3v Tb4b4b4{
T79c0ff0x01 Tff7b72=Tff7b72> Tffa657SomeTb4b4b4(Tff7b72Self::Te6edf3ConnectTb4b4b4)Tb4b4b4,
T79c0ff0x02 Tff7b72=Tff7b72> Tffa657SomeTb4b4b4(Tff7b72Self::Te6edf3ConnectOkTb4b4b4)Tb4b4b4,
T79c0ff0x03 Tff7b72=Tff7b72> Tffa657SomeTb4b4b4(Tff7b72Self::Te6edf3ConnectErrTb4b4b4)Tb4b4b4,
T79c0ff0x04 Tff7b72=Tff7b72> Tffa657SomeTb4b4b4(Tff7b72Self::Te6edf3DataTb4b4b4)Tb4b4b4,
T79c0ff0x05 Tff7b72=Tff7b72> Tffa657SomeTb4b4b4(Tff7b72Self::Te6edf3CloseTb4b4b4)Tb4b4b4,
Te6edf3_ Tff7b72=Tff7b72> Tffa657NoneTb4b4b4,
Tb4b4b4}
Tb4b4b4}
Tb4b4b4}
Tff7b72impl Te6edf3fmt::Te6edf3Display Tff7b72for Te6edf3FrameType Tb4b4b4{
Tff7b72fn Td2a8fffmtTb4b4b4(Tff7b72&Tff7b72selfTb4b4b4, Te6edf3f: Tff7b72&T56d364mut Te6edf3fmt::Te6edf3FormatterTff7b72<Tff7b72'Tffa657_Tff7b72>Tb4b4b4) -> T56d364fmt::Tffa657Result Tb4b4b4{
Tff7b72match Tff7b72self Tb4b4b4{
Tff7b72Self::Te6edf3Connect Tff7b72=Tff7b72> Tff7b72write!Tb4b4b4(Te6edf3fTb4b4b4, Ta5d6ff"Ta5d6ffCONNECTTa5d6ff"Tb4b4b4)Tb4b4b4,
Tff7b72Self::Te6edf3ConnectOk Tff7b72=Tff7b72> Tff7b72write!Tb4b4b4(Te6edf3fTb4b4b4, Ta5d6ff"Ta5d6ffCONN_OKTa5d6ff"Tb4b4b4)Tb4b4b4,
Tff7b72Self::Te6edf3ConnectErr Tff7b72=Tff7b72> Tff7b72write!Tb4b4b4(Te6edf3fTb4b4b4, Ta5d6ff"Ta5d6ffCONN_ERRTa5d6ff"Tb4b4b4)Tb4b4b4,
Tff7b72Self::Te6edf3Data Tff7b72=Tff7b72> Tff7b72write!Tb4b4b4(Te6edf3fTb4b4b4, Ta5d6ff"Ta5d6ffDATATa5d6ff"Tb4b4b4)Tb4b4b4,
Tff7b72Self::Te6edf3Close Tff7b72=Tff7b72> Tff7b72write!Tb4b4b4(Te6edf3fTb4b4b4, Ta5d6ff"Ta5d6ffCLOSETa5d6ff"Tb4b4b4)Tb4b4b4,
Tb4b4b4}
Tb4b4b4}
Tb4b4b4}
T8b949e// ---------------------------------------------------------------------------
T8b949e// Frame encode / decode
T8b949e// ---------------------------------------------------------------------------
T8b949e/// A multiplexed frame on the wire.
Tff7b72#[Tff7b72derive(Debug, Clone)Tff7b72]
Tff7b72pub Tff7b72struct T56d364Frame Tb4b4b4{
Tff7b72pub Te6edf3frame_type: T56d364FrameTypeTb4b4b4,
Tff7b72pub Te6edf3session_id: Tffa657u32Tb4b4b4,
Tff7b72pub Te6edf3payload: Tffa657VecTff7b72<Tffa657u8Tff7b72>Tb4b4b4,
Tb4b4b4}
Tff7b72pub Tff7b72enum T56d364FrameDecodeState Tb4b4b4{
Te6edf3MoreDataRequiredTb4b4b4,
Te6edf3DecodingFailedTb4b4b4,
Tb4b4b4}
Tff7b72impl Te6edf3Frame Tb4b4b4{
Tff7b72pub Tff7b72fn Td2a8ffnewTb4b4b4(Te6edf3frame_type: T56d364FrameTypeTb4b4b4, Te6edf3session_id: Tffa657u32Tb4b4b4, Te6edf3payload: Tffa657VecTff7b72<Tffa657u8Tff7b72>Tb4b4b4) -> T56d364Self Tb4b4b4{
Tff7b72Self Tb4b4b4{
Te6edf3frame_typeTb4b4b4,
Te6edf3session_idTb4b4b4,
Te6edf3payloadTb4b4b4,
Tb4b4b4}
Tb4b4b4}
T8b949e/// Encode a frame into bytes (wire format).
Tff7b72pub Tff7b72fn Td2a8ffencodeTb4b4b4(Tff7b72&Tff7b72selfTb4b4b4) -> Tffa657VecTff7b72<Tffa657u8Tff7b72> Tb4b4b4{
Tff7b72let Te6edf3len Tff7b72= Tff7b72selfTb4b4b4.Te6edf3payloadTb4b4b4.Te6edf3lenTb4b4b4(Tb4b4b4) Tff7b72as Tffa657u16Tb4b4b4;
Te6edf3infoTff7b72!Tb4b4b4(Ta5d6ff"Ta5d6fflen: {}Ta5d6ff"Tb4b4b4, Tff7b72selfTb4b4b4.Te6edf3payloadTb4b4b4.Te6edf3lenTb4b4b4(Tb4b4b4)Tb4b4b4)Tb4b4b4;
Tff7b72let Tff7b72mut Te6edf3buf Tff7b72= Tffa657Vec::Te6edf3with_capacityTb4b4b4(Te6edf3HDR_SIZE Tff7b72+ Tff7b72selfTb4b4b4.Te6edf3payloadTb4b4b4.Te6edf3lenTb4b4b4(Tb4b4b4)Tb4b4b4)Tb4b4b4;
Te6edf3bufTb4b4b4.Te6edf3pushTb4b4b4(Tff7b72selfTb4b4b4.Te6edf3frame_type Tff7b72as Tffa657u8Tb4b4b4)Tb4b4b4;
Te6edf3bufTb4b4b4.Te6edf3extend_from_sliceTb4b4b4(Tff7b72&Tff7b72selfTb4b4b4.Te6edf3session_idTb4b4b4.Te6edf3to_be_bytesTb4b4b4(Tb4b4b4)Tb4b4b4)Tb4b4b4;
Te6edf3bufTb4b4b4.Te6edf3extend_from_sliceTb4b4b4(Tff7b72&Te6edf3lenTb4b4b4.Te6edf3to_be_bytesTb4b4b4(Tb4b4b4)Tb4b4b4)Tb4b4b4;
Te6edf3bufTb4b4b4.Te6edf3extend_from_sliceTb4b4b4(Tff7b72&Tff7b72selfTb4b4b4.Te6edf3payloadTb4b4b4)Tb4b4b4;
Te6edf3buf
Tb4b4b4}
T8b949e/// Decode a frame from a complete buffer (header + payload).
T8b949e/// Returns `None` if the buffer is too small or the type is unknown.
Tff7b72pub Tff7b72fn Td2a8ffdecodeTb4b4b4(Te6edf3buf: Tff7b72&Tb4b4b4[Tffa657u8Tb4b4b4]Tb4b4b4) -> Tffa657ResultTff7b72<Tb4b4b4(Tff7b72SelfTb4b4b4, Tffa657usizeTb4b4b4)Tb4b4b4, Te6edf3FrameDecodeStateTff7b72> Tb4b4b4{
Tff7b72if Te6edf3bufTb4b4b4.Te6edf3lenTb4b4b4(Tb4b4b4) Tff7b72< Te6edf3HDR_SIZE Tb4b4b4{
T8b949e// means we completely
Tff7b72return Tffa657ErrTb4b4b4(Te6edf3MoreDataRequiredTb4b4b4)Tb4b4b4;
Tb4b4b4}
Tff7b72let Te6edf3frame_type Tff7b72= Te6edf3FrameType::Te6edf3from_u8Tb4b4b4(Te6edf3bufTb4b4b4[T79c0ff0Tb4b4b4]Tb4b4b4)Tb4b4b4.Te6edf3ok_orTb4b4b4(Te6edf3DecodingFailedTb4b4b4)Tff7b72?Tb4b4b4;
Tff7b72let Te6edf3session_id Tff7b72= Tffa657u32::Te6edf3from_be_bytesTb4b4b4(Tb4b4b4[Te6edf3bufTb4b4b4[T79c0ff1Tb4b4b4]Tb4b4b4, Te6edf3bufTb4b4b4[T79c0ff2Tb4b4b4]Tb4b4b4, Te6edf3bufTb4b4b4[T79c0ff3Tb4b4b4]Tb4b4b4, Te6edf3bufTb4b4b4[T79c0ff4Tb4b4b4]Tb4b4b4]Tb4b4b4)Tb4b4b4;
Tff7b72let Te6edf3payload_len Tff7b72= Tffa657u16::Te6edf3from_be_bytesTb4b4b4(Tb4b4b4[Te6edf3bufTb4b4b4[T79c0ff5Tb4b4b4]Tb4b4b4, Te6edf3bufTb4b4b4[T79c0ff6Tb4b4b4]Tb4b4b4]Tb4b4b4) Tff7b72as Tffa657usizeTb4b4b4;
Tff7b72let Te6edf3total Tff7b72= Te6edf3HDR_SIZE Tff7b72+ Te6edf3payload_lenTb4b4b4;
T8b949e// info!("info2: {} {} {} {} {}", frame_type, session_id, payload_len, total, buf.len());
Tff7b72if Te6edf3bufTb4b4b4.Te6edf3lenTb4b4b4(Tb4b4b4) Tff7b72< Te6edf3total Tb4b4b4{
Tff7b72return Tffa657ErrTb4b4b4(Te6edf3MoreDataRequiredTb4b4b4)Tb4b4b4;
Tb4b4b4} Tff7b72else Tff7b72if Te6edf3bufTb4b4b4.Te6edf3lenTb4b4b4(Tb4b4b4) Tff7b72< Te6edf3total Tb4b4b4{
T8b949e// error!("Buf oversized? 100% a bug, ignoring packet hoping that'll fix things");
T8b949e// return Err(DecodingFailed)
Tb4b4b4}
Tff7b72let Te6edf3payload Tff7b72= Te6edf3bufTb4b4b4[Te6edf3HDR_SIZETff7b72..Te6edf3totalTb4b4b4]Tb4b4b4.Te6edf3to_vecTb4b4b4(Tb4b4b4)Tb4b4b4;
Tffa657OkTb4b4b4(Tb4b4b4(
Tff7b72Self Tb4b4b4{
Te6edf3frame_typeTb4b4b4,
Te6edf3session_idTb4b4b4,
Te6edf3payloadTb4b4b4,
Tb4b4b4}Tb4b4b4,
Te6edf3totalTb4b4b4,
Tb4b4b4)Tb4b4b4)
Tb4b4b4}
Tb4b4b4}
T8b949e// ---------------------------------------------------------------------------
T8b949e// CONNECT payload helpers
T8b949e// ---------------------------------------------------------------------------
Tff7b72pub Tff7b72fn Td2a8ffadTb4b4b4(Tb4b4b4) Tb4b4b4{
Tb4b4b4}
T8b949e/// Build a CONNECT frame payload: `[1 byte host_len][host bytes][2 bytes port BE][1 bytes settings]`
T8b949e/// currently the byte setting only denotes udp but could be used for more in the future
T8b949e/// ignore any other bit other than that most significant.
Tff7b72pub Tff7b72fn Td2a8ffencode_connect_payloadTb4b4b4(Te6edf3host: Tff7b72&Tffa657strTb4b4b4, Te6edf3port: Tffa657u16Tb4b4b4, Te6edf3udp: Tffa657boolTb4b4b4) -> Tffa657VecTff7b72<Tffa657u8Tff7b72> Tb4b4b4{
Tff7b72let Te6edf3h Tff7b72= Te6edf3hostTb4b4b4.Te6edf3as_bytesTb4b4b4(Tb4b4b4)Tb4b4b4;
Tff7b72let Tff7b72mut Te6edf3buf Tff7b72= Tffa657Vec::Te6edf3with_capacityTb4b4b4(T79c0ff1 Tff7b72+ Te6edf3hTb4b4b4.Te6edf3lenTb4b4b4(Tb4b4b4) Tff7b72+ T79c0ff2Tb4b4b4)Tb4b4b4;
Te6edf3bufTb4b4b4.Te6edf3pushTb4b4b4(Te6edf3hTb4b4b4.Te6edf3lenTb4b4b4(Tb4b4b4) Tff7b72as Tffa657u8Tb4b4b4)Tb4b4b4;
Te6edf3bufTb4b4b4.Te6edf3extend_from_sliceTb4b4b4(Te6edf3hTb4b4b4)Tb4b4b4;
Te6edf3bufTb4b4b4.Te6edf3extend_from_sliceTb4b4b4(Tff7b72&Te6edf3portTb4b4b4.Te6edf3to_be_bytesTb4b4b4(Tb4b4b4)Tb4b4b4)Tb4b4b4;
Tff7b72if Te6edf3udp Tb4b4b4{ T8b949e// setting byte could be used for more data later on but right now it's just for udp.
Te6edf3bufTb4b4b4.Te6edf3extend_from_sliceTb4b4b4(Tff7b72&Tb4b4b4[T79c0ff0b10000000Tb4b4b4]Tb4b4b4)Tb4b4b4;
Tb4b4b4} Tff7b72else Tb4b4b4{
Te6edf3bufTb4b4b4.Te6edf3extend_from_sliceTb4b4b4(Tff7b72&Tb4b4b4[T79c0ff0b00000000Tb4b4b4]Tb4b4b4)Tb4b4b4;
Tb4b4b4}
Te6edf3buf
Tb4b4b4}
T8b949e/// Parse a CONNECT frame payload. Returns `(host, port)`.
Tff7b72pub Tff7b72fn Td2a8ffdecode_connect_payloadTb4b4b4(Te6edf3data: Tff7b72&Tb4b4b4[Tffa657u8Tb4b4b4]Tb4b4b4) -> Tffa657OptionTff7b72<Tb4b4b4(Tffa657StringTb4b4b4, Tffa657u16Tb4b4b4, Tffa657boolTb4b4b4)Tff7b72> Tb4b4b4{
Tff7b72if Te6edf3dataTb4b4b4.Te6edf3is_emptyTb4b4b4(Tb4b4b4) Tb4b4b4{
Tff7b72return Tffa657NoneTb4b4b4;
Tb4b4b4}
Tff7b72let Te6edf3n Tff7b72= Te6edf3dataTb4b4b4[T79c0ff0Tb4b4b4] Tff7b72as Tffa657usizeTb4b4b4;
Tff7b72if Te6edf3dataTb4b4b4.Te6edf3lenTb4b4b4(Tb4b4b4) Tff7b72< T79c0ff1 Tff7b72+ Te6edf3n Tff7b72+ T79c0ff2 Tb4b4b4{
Tff7b72return Tffa657NoneTb4b4b4;
Tb4b4b4}
Tff7b72let Te6edf3host Tff7b72= Tffa657String::Te6edf3from_utf8Tb4b4b4(Te6edf3dataTb4b4b4[T79c0ff1Tff7b72..T79c0ff1 Tff7b72+ Te6edf3nTb4b4b4]Tb4b4b4.Te6edf3to_vecTb4b4b4(Tb4b4b4)Tb4b4b4)Tb4b4b4.Te6edf3okTb4b4b4(Tb4b4b4)Tff7b72?Tb4b4b4;
Tff7b72let Te6edf3port Tff7b72= Tffa657u16::Te6edf3from_be_bytesTb4b4b4(Tb4b4b4[Te6edf3dataTb4b4b4[T79c0ff1 Tff7b72+ Te6edf3nTb4b4b4]Tb4b4b4, Te6edf3dataTb4b4b4[T79c0ff2 Tff7b72+ Te6edf3nTb4b4b4]Tb4b4b4]Tb4b4b4)Tb4b4b4;
Tff7b72let Te6edf3udp Tff7b72= Tff7b72if Tb4b4b4(Te6edf3dataTb4b4b4[Te6edf3n Tff7b72+ T79c0ff3Tb4b4b4] Tff7b72& T79c0ff0b10000000Tb4b4b4) Tff7b72=Tff7b72= T79c0ff0 Tb4b4b4{Tff7b72falseTb4b4b4} Tff7b72else Tb4b4b4{ Tff7b72true Tb4b4b4}Tb4b4b4;
Tffa657SomeTb4b4b4(Tb4b4b4(Te6edf3hostTb4b4b4, Te6edf3portTb4b4b4, Te6edf3udpTb4b4b4)Tb4b4b4)
Tb4b4b4}
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