rust-bitcoin-unsafe-fast/bitcoin/examples/handshake.rs

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extern crate bitcoin;
use std::io::{BufReader, Write};
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use std::net::{IpAddr, Ipv4Addr, Shutdown, SocketAddr, TcpStream};
use std::time::{SystemTime, UNIX_EPOCH};
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use std::{env, process};
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use bitcoin::consensus::{encode, Decodable};
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use bitcoin::network::{address, constants, message, message_network};
use bitcoin::secp256k1;
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use bitcoin::secp256k1::rand::Rng;
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fn main() {
// This example establishes a connection to a Bitcoin node, sends the intial
// "version" message, waits for the reply, and finally closes the connection.
let args: Vec<String> = env::args().collect();
if args.len() < 2 {
eprintln!("not enough arguments");
process::exit(1);
}
let str_address = &args[1];
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let address: SocketAddr = str_address.parse().unwrap_or_else(|error| {
eprintln!("Error parsing address: {:?}", error);
process::exit(1);
});
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let version_message = build_version_message(address);
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let first_message = message::RawNetworkMessage {
magic: constants::Network::Bitcoin.magic(),
payload: version_message,
};
if let Ok(mut stream) = TcpStream::connect(address) {
// Send the message
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let _ = stream.write_all(encode::serialize(&first_message).as_slice());
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println!("Sent version message");
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// Setup StreamReader
let read_stream = stream.try_clone().unwrap();
let mut stream_reader = BufReader::new(read_stream);
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loop {
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// Loop an retrieve new messages
let reply = message::RawNetworkMessage::consensus_decode(&mut stream_reader).unwrap();
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match reply.payload {
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message::NetworkMessage::Version(_) => {
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println!("Received version message: {:?}", reply.payload);
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let second_message = message::RawNetworkMessage {
magic: constants::Network::Bitcoin.magic(),
payload: message::NetworkMessage::Verack,
};
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let _ = stream.write_all(encode::serialize(&second_message).as_slice());
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println!("Sent verack message");
}
message::NetworkMessage::Verack => {
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println!("Received verack message: {:?}", reply.payload);
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break;
}
_ => {
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println!("Received unknown message: {:?}", reply.payload);
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break;
}
}
}
let _ = stream.shutdown(Shutdown::Both);
} else {
eprintln!("Failed to open connection");
}
}
fn build_version_message(address: SocketAddr) -> message::NetworkMessage {
// Building version message, see https://en.bitcoin.it/wiki/Protocol_documentation#version
let my_address = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(0, 0, 0, 0)), 0);
// "bitfield of features to be enabled for this connection"
let services = constants::ServiceFlags::NONE;
// "standard UNIX timestamp in seconds"
let timestamp = SystemTime::now().duration_since(UNIX_EPOCH).expect("Time error").as_secs();
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// "The network address of the node receiving this message"
let addr_recv = address::Address::new(&address, constants::ServiceFlags::NONE);
// "The network address of the node emitting this message"
let addr_from = address::Address::new(&my_address, constants::ServiceFlags::NONE);
// "Node random nonce, randomly generated every time a version packet is sent. This nonce is used to detect connections to self."
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let nonce: u64 = secp256k1::rand::thread_rng().gen();
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// "User Agent (0x00 if string is 0 bytes long)"
let user_agent = String::from("rust-example");
// "The last block received by the emitting node"
let start_height: i32 = 0;
// Construct the message
message::NetworkMessage::Version(message_network::VersionMessage::new(
services,
timestamp as i64,
addr_recv,
addr_from,
nonce,
user_agent,
start_height,
))
}