281 lines
9.9 KiB
Rust
281 lines
9.9 KiB
Rust
//! Definitions of network messages.
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use std::net::SocketAddr;
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use chrono::{DateTime, Utc};
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use zebra_chain;
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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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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.
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address_receiving: NetworkAddress,
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/// The network address of the node emitting this message.
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address_from: NetworkAddress,
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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: zebra_chain::types::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(Nonce),
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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: [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 {
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/// Number of address entries (max: 1000)
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count: u16,
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/// Address of other nodes on the network, preceeded by a timestamp.
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// Starting version 31402, addresses are prefixed with a
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// timestamp. If no timestamp is present, the addresses should
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// not be relayed to other peers, unless it is indeed
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// confirmed they are up.
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//
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// XXX: I don't know how this serializes.
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address_list: (Timestamp, Vec<NetworkAddress>),
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},
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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 {/* XXX add fields */},
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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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Inventory {
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/// Number of inventory entries.
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count: u64,
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/// Inventory vectors.
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inventory: Vec<zebra_chain::types::InventoryVector>,
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},
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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 {
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/// Number of inventory entries.
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count: u64,
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/// Inventory vectors.
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inventory: Vec<zebra_chain::types::InventoryVector>,
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},
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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 {
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/// Number of inventory entries.
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count: u64,
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/// Inventory vectors.
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inventory: Vec<zebra_chain::types::InventoryVector>,
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},
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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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Tx {/* XXX add fields */},
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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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// Q: how do we want to implement serialization, exactly? do we want to have
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// something generic over stdlib Read and Write traits, or over async versions
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// of those traits?
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/// A protocol version magic number.
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pub struct Version(pub u32);
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/// Bitfield of features to be enabled for this connection.
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// Tower provides utilities for service discovery, so this might go
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// away in the future in favor of that.
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pub struct Services(pub u64);
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/// A network address but with some extra flavor.
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///
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/// When a network address is needed somewhere, this structure is
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/// used. Network addresses are not prefixed with a timestamp in the
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/// version message.
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///
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/// [Bitcoin reference](https://en.bitcoin.it/wiki/Protocol_documentation#Network_address)
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pub struct NetworkAddress(pub Services, pub SocketAddr);
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/// A nonce used in the networking layer to identify messages.
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pub struct Nonce(pub u64);
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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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#[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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