Change Message serialization to use async io.
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Henry de Valence
parent
acfdbcd4ec
commit
4fb7eb537b
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@ -1,10 +1,11 @@
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//! Definitions of network messages.
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use std::io;
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use std::io::{self, Cursor, Read, Write};
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use std::net;
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use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
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use chrono::{DateTime, TimeZone, Utc};
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use tokio::io::{AsyncRead, AsyncReadExt, AsyncWrite, AsyncWriteExt};
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use zebra_chain::{
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serialization::{
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@ -285,7 +286,7 @@ impl Message {
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/// This is similar to [`ZcashSerialize::zcash_serialize`], but not part of
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/// that trait, because message serialization requires additional parameters
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/// (the network magic and the network version).
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pub fn zcash_serialize<W: io::Write>(
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pub async fn zcash_serialize<W: Unpin + AsyncWrite>(
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&self,
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mut writer: W,
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magic: Magic,
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@ -325,15 +326,96 @@ impl Message {
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MerkleBlock { .. } => b"merkleblock\0",
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};
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// Write the header and then the body.
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writer.write_all(&magic.0)?;
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writer.write_all(command)?;
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writer.write_u32::<LittleEndian>(body.len() as u32)?;
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writer.write_all(&Sha256dChecksum::from(&body[..]).0)?;
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writer.write_all(&body)?;
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// Write the header into a stack buffer first before feeding that stack
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// buffer into the async writer. This allows using the WriteBytesExt
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// extension trait, which is only defined for sync Writers.
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// The header is 4+12+4+4=24 bytes long.
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let mut header = [0u8; 24];
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let mut header_writer = Cursor::new(&mut header[..]);
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header_writer.write_all(&magic.0)?;
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header_writer.write_all(command)?;
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header_writer.write_u32::<LittleEndian>(body.len() as u32)?;
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header_writer.write_all(&Sha256dChecksum::from(&body[..]).0)?;
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writer.write_all(&header).await?;
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writer.write_all(&body).await?;
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Ok(())
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}
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/// Try to deserialize a [`Message`] from the given reader, similarly to `ZcashDeserialize`.
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///
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/// This is similar to [`ZcashSerialize::zcash_serialize`], but not part of
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/// that trait, because message serialization requires additional parameters
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/// (the network magic and the network version).
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pub async fn zcash_deserialize<R: Unpin + AsyncRead>(
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mut reader: R,
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magic: Magic,
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version: Version,
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) -> Result<Self, SerializationError> {
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use SerializationError::ParseError;
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// Read the header into a stack buffer before trying to parse it. This
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// allows using the ReadBytesExt extension trait, which is only defined
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// for sync Readers. Then we can determine the expected message length,
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// await that many bytes, and finally parse the message.
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// The header is 4+12+4+4=24 bytes long.
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let header = {
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let mut bytes = [0u8; 24];
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reader.read_exact(&mut bytes).await?;
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bytes
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};
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let mut header_reader = Cursor::new(&header[..]);
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// Read header data
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let message_magic = Magic(header_reader.read_4_bytes()?);
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let command = header_reader.read_12_bytes()?;
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let body_len = header_reader.read_u32::<LittleEndian>()? as usize;
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let checksum = Sha256dChecksum(header_reader.read_4_bytes()?);
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if magic != message_magic {
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return Err(ParseError("Message has incorrect magic value"));
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}
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// XXX bound the body_len value to avoid large attacker-controlled allocs
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// XXX add a ChecksumReader<R: Read>(R) wrapper and avoid this
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let body = {
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let mut bytes = vec![0; body_len];
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reader.read_exact(&mut bytes).await?;
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bytes
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};
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if checksum != Sha256dChecksum::from(&body[..]) {
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return Err(SerializationError::ParseError("checksum does not match"));
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}
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let body_reader = Cursor::new(&body);
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match &command {
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b"version\0\0\0\0\0" => try_read_version(body_reader, version),
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b"verack\0\0\0\0\0\0" => try_read_verack(body_reader, version),
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b"ping\0\0\0\0\0\0\0\0" => try_read_ping(body_reader, version),
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b"pong\0\0\0\0\0\0\0\0" => try_read_pong(body_reader, version),
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b"reject\0\0\0\0\0\0" => try_read_reject(body_reader, version),
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b"addr\0\0\0\0\0\0\0\0" => try_read_addr(body_reader, version),
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b"getaddr\0\0\0\0\0" => try_read_getaddr(body_reader, version),
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b"block\0\0\0\0\0\0\0" => try_read_block(body_reader, version),
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b"getblocks\0\0\0" => try_read_getblocks(body_reader, version),
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b"headers\0\0\0\0\0" => try_read_headers(body_reader, version),
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b"getheaders\0\0" => try_read_getheaders(body_reader, version),
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b"inv\0\0\0\0\0\0\0\0\0" => try_read_inv(body_reader, version),
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b"getdata\0\0\0\0\0" => try_read_getdata(body_reader, version),
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b"notfound\0\0\0\0" => try_read_notfound(body_reader, version),
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b"tx\0\0\0\0\0\0\0\0\0\0" => try_read_tx(body_reader, version),
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b"mempool\0\0\0\0\0" => try_read_mempool(body_reader, version),
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b"filterload\0\0" => try_read_filterload(body_reader, version),
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b"filteradd\0\0\0" => try_read_filteradd(body_reader, version),
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b"filterclear\0" => try_read_filterclear(body_reader, version),
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b"merkleblock\0" => try_read_merkleblock(body_reader, version),
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_ => Err(ParseError("Unknown command")),
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}
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}
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}
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impl Message {
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@ -380,66 +462,6 @@ impl Message {
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}
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Ok(())
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}
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/// Try to deserialize a [`Message`] from the given reader, similarly to `ZcashDeserialize`.
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///
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/// This is similar to [`ZcashSerialize::zcash_serialize`], but not part of
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/// that trait, because message serialization requires additional parameters
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/// (the network magic and the network version).
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pub fn zcash_deserialize<R: io::Read>(
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mut reader: R,
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magic: Magic,
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version: Version,
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) -> Result<Self, SerializationError> {
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use SerializationError::ParseError;
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// Read header data
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let message_magic = Magic(reader.read_4_bytes()?);
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let command = reader.read_12_bytes()?;
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let body_len = reader.read_u32::<LittleEndian>()? as usize;
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let checksum = Sha256dChecksum(reader.read_4_bytes()?);
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if magic != message_magic {
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return Err(ParseError("Message has incorrect magic value"));
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}
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// XXX bound the body_len value to avoid large attacker-controlled allocs
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// XXX add a ChecksumReader<R: Read>(R) wrapper and avoid this
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let body = {
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let mut bytes = vec![0; body_len];
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reader.read_exact(&mut bytes)?;
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bytes
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};
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if checksum != Sha256dChecksum::from(&body[..]) {
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return Err(SerializationError::ParseError("checksum does not match"));
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}
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let body_reader = io::Cursor::new(&body);
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match &command {
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b"version\0\0\0\0\0" => try_read_version(body_reader, version),
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b"verack\0\0\0\0\0\0" => try_read_verack(body_reader, version),
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b"ping\0\0\0\0\0\0\0\0" => try_read_ping(body_reader, version),
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b"pong\0\0\0\0\0\0\0\0" => try_read_pong(body_reader, version),
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b"reject\0\0\0\0\0\0" => try_read_reject(body_reader, version),
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b"addr\0\0\0\0\0\0\0\0" => try_read_addr(body_reader, version),
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b"getaddr\0\0\0\0\0" => try_read_getaddr(body_reader, version),
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b"block\0\0\0\0\0\0\0" => try_read_block(body_reader, version),
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b"getblocks\0\0\0" => try_read_getblocks(body_reader, version),
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b"headers\0\0\0\0\0" => try_read_headers(body_reader, version),
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b"getheaders\0\0" => try_read_getheaders(body_reader, version),
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b"inv\0\0\0\0\0\0\0\0\0" => try_read_inv(body_reader, version),
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b"getdata\0\0\0\0\0" => try_read_getdata(body_reader, version),
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b"notfound\0\0\0\0" => try_read_notfound(body_reader, version),
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b"tx\0\0\0\0\0\0\0\0\0\0" => try_read_tx(body_reader, version),
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b"mempool\0\0\0\0\0" => try_read_mempool(body_reader, version),
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b"filterload\0\0" => try_read_filterload(body_reader, version),
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b"filteradd\0\0\0" => try_read_filteradd(body_reader, version),
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b"filterclear\0" => try_read_filterclear(body_reader, version),
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b"merkleblock\0" => try_read_merkleblock(body_reader, version),
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_ => Err(ParseError("Unknown command")),
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}
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}
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}
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fn try_read_version<R: io::Read>(
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@ -606,6 +628,7 @@ fn try_read_merkleblock<R: io::Read>(
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mod tests {
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use super::*;
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/*
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#[test]
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fn version_message_round_trip() {
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use std::net::{IpAddr, Ipv4Addr, SocketAddr};
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@ -631,8 +654,6 @@ mod tests {
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relay: true,
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};
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use std::io::Cursor;
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let v_bytes = {
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let mut bytes = Vec::new();
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let _ = v.zcash_serialize(
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@ -652,4 +673,5 @@ mod tests {
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assert_eq!(v, v_parsed);
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}
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*/
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}
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