254 lines
8.9 KiB
Rust
254 lines
8.9 KiB
Rust
//! Definitions of network messages.
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use std::net;
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use chrono::{DateTime, Utc};
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use zebra_chain::block::Block;
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use zebra_chain::{transaction::Transaction, types::BlockHeight};
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use crate::meta_addr::MetaAddr;
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use super::inv::InventoryHash;
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use super::types::*;
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/// A Bitcoin-like network message for the Zcash protocol.
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///
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/// The Zcash network protocol is mostly inherited from Bitcoin, and a list of
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/// Bitcoin network messages can be found [on the Bitcoin
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/// wiki][btc_wiki_protocol].
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///
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/// That page describes the wire format of the messages, while this enum stores
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/// an internal representation. The internal representation is unlinked from the
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/// wire format, and the translation between the two happens only during
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/// serialization and deserialization. For instance, Bitcoin identifies messages
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/// by a 12-byte ascii command string; we consider this a serialization detail
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/// and use the enum discriminant instead. (As a side benefit, this also means
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/// that we have a clearly-defined validation boundary for network messages
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/// during serialization).
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///
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/// [btc_wiki_protocol]: https://en.bitcoin.it/wiki/Protocol_documentation
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//
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// XXX not all messages are filled in yet. Messages written as { /* XXX add
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// fields */ } are explicitly incomplete and we need to define a mapping between
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// the serialized message data and the internal representation. Note that this
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// is different from messages like GetAddr which have no data (and so have no
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// fields).
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#[derive(Clone, Debug, Eq, PartialEq)]
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pub enum Message {
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/// A `version` message.
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///
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/// Note that although this is called `version` in Bitcoin, its role is really
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/// analogous to a `ClientHello` message in TLS, used to begin a handshake, and
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/// is distinct from a simple version number.
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///
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/// [Bitcoin reference](https://en.bitcoin.it/wiki/Protocol_documentation#version)
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Version {
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/// The network version number supported by the sender.
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version: Version,
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/// The network services advertised by the sender.
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services: Services,
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/// The time when the version message was sent.
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timestamp: DateTime<Utc>,
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/// The network address of the node receiving this message, and its
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/// advertised network services.
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///
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/// Q: how does the handshake know the remote peer's services already?
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address_recv: (Services, net::SocketAddr),
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/// The network address of the node sending this message, and its
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/// advertised network services.
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address_from: (Services, net::SocketAddr),
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/// Node random nonce, randomly generated every time a version
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/// packet is sent. This nonce is used to detect connections
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/// to self.
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nonce: Nonce,
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/// The Zcash user agent advertised by the sender.
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user_agent: String,
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/// The last block received by the emitting node.
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start_height: BlockHeight,
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/// Whether the remote peer should announce relayed
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/// transactions or not, see [BIP 0037](https://github.com/bitcoin/bips/blob/master/bip-0037.mediawiki)
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relay: bool,
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},
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/// A `verack` message.
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///
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/// [Bitcoin reference](https://en.bitcoin.it/wiki/Protocol_documentation#verack)
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Verack,
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/// A `ping` message.
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///
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/// [Bitcoin reference](https://en.bitcoin.it/wiki/Protocol_documentation#ping)
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Ping(
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/// A nonce unique to this [`Ping`] message.
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Nonce,
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),
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/// A `pong` message.
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///
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/// [Bitcoin reference](https://en.bitcoin.it/wiki/Protocol_documentation#pong)
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Pong(
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/// The nonce from the [`Ping`] message this was in response to.
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Nonce,
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),
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/// A `reject` message.
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///
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/// [Bitcoin reference](https://en.bitcoin.it/wiki/Protocol_documentation#reject)
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Reject {
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/// Type of message rejected.
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// Q: can we just reference the Type, rather than instantiate an instance of the enum type?
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message: Box<Message>,
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/// RejectReason code relating to rejected message.
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ccode: RejectReason,
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/// Human-readable version of rejection reason.
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reason: String,
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/// Optional extra data provided for some errors.
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// Currently, all errors which provide this field fill it with
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// the TXID or block header hash of the object being rejected,
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// so the field is 32 bytes.
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//
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// Q: can we tell Rust that this field is optional? Or just
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// default its value to an empty array, I guess.
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data: Option<[u8; 32]>,
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},
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/// An `addr` message.
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///
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/// [Bitcoin reference](https://en.bitcoin.it/wiki/Protocol_documentation#addr)
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Addr(Vec<MetaAddr>),
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/// A `getaddr` message.
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///
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/// [Bitcoin reference](https://en.bitcoin.it/wiki/Protocol_documentation#getaddr)
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GetAddr,
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/// A `block` message.
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///
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/// [Bitcoin reference](https://en.bitcoin.it/wiki/Protocol_documentation#block)
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Block {
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/// The block itself.
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block: Block,
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},
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/// A `getblocks` message.
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///
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/// [Bitcoin reference](https://en.bitcoin.it/wiki/Protocol_documentation#getblocks)
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GetBlocks {/* XXX add fields */},
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/// A `headers` message.
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///
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/// [Bitcoin reference](https://en.bitcoin.it/wiki/Protocol_documentation#headers)
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Headers {/* XXX add fields */},
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/// A `getheaders` message.
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///
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/// [Bitcoin reference](https://en.bitcoin.it/wiki/Protocol_documentation#getheaders)
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GetHeaders {/* XXX add fields */},
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/// An `inv` message.
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///
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/// [Bitcoin reference](https://en.bitcoin.it/wiki/Protocol_documentation#inv)
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// XXX the bitcoin reference above suggests this can be 1.8 MB in bitcoin -- maybe
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// larger in Zcash, since Zcash objects could be bigger (?) -- does this tilt towards
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// having serialization be async?
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Inv(Vec<InventoryHash>),
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/// A `getdata` message.
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///
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/// `getdata` is used in response to `inv`, to retrieve the content of
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/// a specific object, and is usually sent after receiving an `inv`
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/// packet, after filtering known elements.
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///
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/// [Bitcoin reference](https://en.bitcoin.it/wiki/Protocol_documentation#getdata)
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GetData(Vec<InventoryHash>),
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/// A `notfound` message.
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///
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/// [Bitcoin reference](https://en.bitcoin.it/wiki/Protocol_documentation#notfound)
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// See note above on `Inventory`.
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NotFound(Vec<InventoryHash>),
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/// A `tx` message.
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///
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/// [Bitcoin reference](https://en.bitcoin.it/wiki/Protocol_documentation#tx)
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// `flag` is not included (it's optional), and therefore
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// `tx_witnesses` aren't either, as they go if `flag` goes.
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Tx {
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/// Transaction data format version (note, this is signed).
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version: Version,
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/// The `Transaction` type itself.
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// XXX Is this ~aesthetic~?
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transaction: Transaction,
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},
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/// A `mempool` message.
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///
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/// This was defined in [BIP35], which is included in Zcash.
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///
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/// [Bitcoin reference](https://en.bitcoin.it/wiki/Protocol_documentation#mempool)
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/// [BIP35]: https://github.com/bitcoin/bips/blob/master/bip-0035.mediawiki
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Mempool {/* XXX add fields */},
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/// A `filterload` message.
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///
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/// This was defined in [BIP37], which is included in Zcash.
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///
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/// [Bitcoin reference](https://en.bitcoin.it/wiki/Protocol_documentation#filterload.2C_filteradd.2C_filterclear.2C_merkleblock)
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/// [BIP37]: https://github.com/bitcoin/bips/blob/master/bip-0037.mediawiki
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FilterLoad {/* XXX add fields */},
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/// A `filteradd` message.
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///
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/// This was defined in [BIP37], which is included in Zcash.
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///
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/// [Bitcoin reference](https://en.bitcoin.it/wiki/Protocol_documentation#filterload.2C_filteradd.2C_filterclear.2C_merkleblock)
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/// [BIP37]: https://github.com/bitcoin/bips/blob/master/bip-0037.mediawiki
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FilterAdd {/* XXX add fields */},
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/// A `filterclear` message.
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///
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/// This was defined in [BIP37], which is included in Zcash.
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///
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/// [Bitcoin reference](https://en.bitcoin.it/wiki/Protocol_documentation#filterload.2C_filteradd.2C_filterclear.2C_merkleblock)
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/// [BIP37]: https://github.com/bitcoin/bips/blob/master/bip-0037.mediawiki
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FilterClear {/* XXX add fields */},
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/// A `merkleblock` message.
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///
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/// This was defined in [BIP37], which is included in Zcash.
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///
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/// [Bitcoin reference](https://en.bitcoin.it/wiki/Protocol_documentation#filterload.2C_filteradd.2C_filterclear.2C_merkleblock)
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/// [BIP37]: https://github.com/bitcoin/bips/blob/master/bip-0037.mediawiki
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MerkleBlock {/* XXX add fields */},
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}
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/// Reject Reason CCodes
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///
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/// [Bitcoin reference](https://en.bitcoin.it/wiki/Protocol_documentation#reject)
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#[derive(Copy, Clone, Debug, Eq, PartialEq)]
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#[repr(u8)]
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#[allow(missing_docs)]
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pub enum RejectReason {
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Malformed = 0x01,
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Invalid = 0x10,
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Obsolete = 0x11,
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Duplicate = 0x12,
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Nonstandard = 0x40,
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Dust = 0x41,
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InsufficientFee = 0x42,
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Checkpoint = 0x43,
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}
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