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-rw-r--r--src/sync.rs87
1 files changed, 40 insertions, 47 deletions
diff --git a/src/sync.rs b/src/sync.rs
index d3f54a5..7dcf8e3 100644
--- a/src/sync.rs
+++ b/src/sync.rs
@@ -132,59 +132,54 @@ fn test_bsxii_continued() {
assert_eq!(a, c);
}
-pub struct TcpSodiumReader<'a> {
- dc: &'a mut DatConnection,
+/// Represents a bi-directional connection to a network peer
+///
+/// Spec says nonce is 32 bytes, by dat implementation (hypercore-protocol) is 24 bytes.
+pub struct DatConnection {
+ id: [u8; 32],
+ remote_id: [u8; 32],
+ tcp: TcpStream,
+ live: bool,
+ key: Key,
+ tx_nonce: Nonce,
+ tx_offset: u64,
+ rx_nonce: Nonce,
+ rx_offset: u64,
}
-impl<'a> Read for TcpSodiumReader<'a> {
+impl Read for DatConnection {
+ /// Encrypted TCP read (after connection initialized). Uses XOR of an XSalsa20 stream, using
+ /// block offsets.
fn read(&mut self, buf: &mut [u8]) -> ::std::io::Result<usize> {
- let len = self.dc.tcp.read(buf)?;
- bytewise_stream_xor_ic_inplace(&mut buf[0..len], self.dc.rx_offset, &self.dc.rx_nonce, &self.dc.key);
- self.dc.rx_offset += len as u64;
+ let len = self.tcp.read(buf)?;
+ bytewise_stream_xor_ic_inplace(&mut buf[0..len], self.rx_offset, &self.rx_nonce, &self.key);
+ self.rx_offset += len as u64;
Ok(len)
}
}
-pub struct TcpSodiumWriter<'a> {
- dc: &'a mut DatConnection,
-}
-
-impl<'a> Write for TcpSodiumWriter<'a> {
+impl Write for DatConnection {
+ /// Encrypted write to complement `read()`.
fn write(&mut self, buf: &[u8]) -> ::std::io::Result<usize> {
// Don't mutate what we've been passed
let mut enc = vec![0; buf.len()];
enc.copy_from_slice(buf);
- bytewise_stream_xor_ic_inplace(&mut enc, self.dc.tx_offset, &self.dc.tx_nonce, &self.dc.key);
- self.dc.tx_offset += enc.len() as u64;
+ bytewise_stream_xor_ic_inplace(&mut enc, self.tx_offset, &self.tx_nonce, &self.key);
+ self.tx_offset += enc.len() as u64;
- self.dc.tcp.write(&enc)
+ self.tcp.write(&enc)
}
fn flush(&mut self) -> ::std::io::Result<()> {
- self.dc.tcp.flush()
+ self.tcp.flush()
}
}
-/// Represents a bi-directional connection to a network peer
-///
-/// Spec says nonce is 32 bytes, by dat implementation (hypercore-protocol) is 24 bytes.
-pub struct DatConnection {
- id: [u8; 32],
- remote_id: [u8; 32],
- tcp: TcpStream,
- live: bool,
- key: Key,
- tx_nonce: Nonce,
- tx_offset: u64,
- rx_nonce: Nonce,
- rx_offset: u64,
-}
-
impl DatConnection {
pub fn connect(host_port: &str, key: &[u8], live: bool) -> Result<DatConnection> {
@@ -263,7 +258,6 @@ impl DatConnection {
fn send_msg(&mut self, dnm: &DatNetMessage, is_content: bool) -> Result<()> {
- let mut tx_stream = TcpSodiumWriter { dc: self };
let header_int: u8 = (is_content as u8) << 4 | (msg_code(dnm) & 0x0F);
let msg: &Message = msg_sugar(dnm);
let total_message_size = (msg.compute_size() as usize) + 1;
@@ -272,29 +266,28 @@ impl DatConnection {
total_message_size, header_int, is_content, &dnm);
// send both header varints, and data
- tx_stream.write_varint(total_message_size as u64)?;
- tx_stream.write_varint(header_int as u32)?;
+ self.write_varint(total_message_size as u64)?;
+ self.write_varint(header_int as u32)?;
match dnm {
- &DatNetMessage::Register(ref m) => m.write_to_writer(&mut tx_stream)?,
- &DatNetMessage::Handshake(ref m) => m.write_to_writer(&mut tx_stream)?,
- &DatNetMessage::Status(ref m) => m.write_to_writer(&mut tx_stream)?,
- &DatNetMessage::Have(ref m) => m.write_to_writer(&mut tx_stream)?,
- &DatNetMessage::Unhave(ref m) => m.write_to_writer(&mut tx_stream)?,
- &DatNetMessage::Want(ref m) => m.write_to_writer(&mut tx_stream)?,
- &DatNetMessage::Unwant(ref m) => m.write_to_writer(&mut tx_stream)?,
- &DatNetMessage::Request(ref m) => m.write_to_writer(&mut tx_stream)?,
- &DatNetMessage::Cancel(ref m) => m.write_to_writer(&mut tx_stream)?,
- &DatNetMessage::Data(ref m) => m.write_to_writer(&mut tx_stream)?,
+ &DatNetMessage::Register(ref m) => m.write_to_writer(self)?,
+ &DatNetMessage::Handshake(ref m) => m.write_to_writer(self)?,
+ &DatNetMessage::Status(ref m) => m.write_to_writer(self)?,
+ &DatNetMessage::Have(ref m) => m.write_to_writer(self)?,
+ &DatNetMessage::Unhave(ref m) => m.write_to_writer(self)?,
+ &DatNetMessage::Want(ref m) => m.write_to_writer(self)?,
+ &DatNetMessage::Unwant(ref m) => m.write_to_writer(self)?,
+ &DatNetMessage::Request(ref m) => m.write_to_writer(self)?,
+ &DatNetMessage::Cancel(ref m) => m.write_to_writer(self)?,
+ &DatNetMessage::Data(ref m) => m.write_to_writer(self)?,
}
Ok(())
}
fn recv_msg(&mut self) -> Result<(bool, DatNetMessage)> {
- let mut rx_stream = TcpSodiumReader { dc: self };
- let total_len: u64 = rx_stream.read_varint()?;
- let header: u8 = rx_stream.read_varint()?;
+ let total_len: u64 = self.read_varint()?;
+ let header: u8 = self.read_varint()?;
let is_content = (header & (1 << 4)) != 0;
@@ -306,7 +299,7 @@ impl DatConnection {
let msg_len = (total_len - 1) as usize;
let mut buf = vec![0; msg_len];
- rx_stream.read_exact(&mut buf[0..msg_len])?;
+ self.read_exact(&mut buf[0..msg_len])?;
let dnm = match header & 0x0F {
0 => DatNetMessage::Register(parse_from_bytes::<Feed>(&mut buf)?),