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use diem_types::network_address::NetworkAddress;
use futures::io::{AsyncRead, AsyncReadExt};
use std::{
convert::TryInto,
io,
net::{IpAddr, Ipv4Addr, Ipv6Addr, SocketAddr},
};
const PPV2_SIGNATURE: [u8; 12] = [
0x0D, 0x0A, 0x0D, 0x0A, 0x00, 0x0D, 0x0A, 0x51, 0x55, 0x49, 0x54, 0x0A,
];
const PPV2_LOCAL: u8 = 0x20;
const PPV2_PROXY: u8 = 0x21;
const LOCAL_PROTOCOL: u8 = 0x00;
const TCP_IPV4: u8 = 0x11;
const TCP_IPV6: u8 = 0x21;
const TCP_UNIX: u8 = 0x31;
const UDP_IPV4: u8 = 0x12;
const UDP_IPV6: u8 = 0x22;
const UDP_UNIX: u8 = 0x32;
const IPV4_SIZE: u16 = 12;
const IPV6_SIZE: u16 = 36;
pub async fn read_header<T: AsyncRead + std::marker::Unpin>(
original_addr: &NetworkAddress,
stream: &mut T,
) -> io::Result<NetworkAddress> {
let mut header = [0u8; 16];
stream.read_exact(&mut header).await?;
if header[0..12] != PPV2_SIGNATURE {
return Err(io::Error::new(
io::ErrorKind::InvalidInput,
"ProxyProtocol: Invalid signature",
));
}
let version_and_command = header[12];
match version_and_command {
PPV2_LOCAL | PPV2_PROXY => (),
_ => {
return Err(io::Error::new(
io::ErrorKind::InvalidInput,
"ProxyProtocol: Unsupported command or protocol version",
));
}
};
let family_and_protocol = header[13];
let address_size: [u8; 2] = header[14..16].try_into().unwrap();
let address_size = u16::from_be_bytes(address_size);
let mut address_bytes: Vec<u8> = vec![0; address_size as usize];
stream.read_exact(&mut address_bytes).await?;
let source_address = match family_and_protocol {
LOCAL_PROTOCOL | UDP_IPV4 | UDP_IPV6 | TCP_UNIX | UDP_UNIX => {
original_addr.clone()
}
TCP_IPV4 => {
if address_size < IPV4_SIZE {
return Err(io::Error::new(
io::ErrorKind::InvalidInput,
"ProxyProtocol: Header size doesn't match expected address type",
));
}
let src_addr = u32::from_be_bytes(address_bytes[0..4].try_into().unwrap());
let src_port = u16::from_be_bytes(address_bytes[8..10].try_into().unwrap());
let socket_addr = SocketAddr::new(IpAddr::V4(Ipv4Addr::from(src_addr)), src_port);
NetworkAddress::from(socket_addr)
}
TCP_IPV6 => {
if address_size < IPV6_SIZE {
return Err(io::Error::new(
io::ErrorKind::InvalidInput,
"ProxyProtocol: Header size doesn't match expected address type",
));
}
let src_addr = u128::from_be_bytes(address_bytes[0..16].try_into().unwrap());
let src_port = u16::from_be_bytes(address_bytes[32..34].try_into().unwrap());
let socket_addr = SocketAddr::new(IpAddr::V6(Ipv6Addr::from(src_addr)), src_port);
NetworkAddress::from(socket_addr)
}
_ => {
return Err(io::Error::new(
io::ErrorKind::InvalidInput,
"ProxyProtocol: Unsupported Address Family or Protocol",
));
}
};
Ok(source_address)
}
#[cfg(test)]
mod test {
use super::*;
use futures::{executor::block_on, future::join, io::AsyncWriteExt};
use memsocket::MemorySocket;
use std::net::ToSocketAddrs;
const TEST_DATA: &[u8; 4] = &[0xDE, 0xAD, 0xBE, 0xEF];
const IPV4_ADDR_1: &[u8; 4] = &[0x00, 0x00, 0x00, 0x01];
const IPV4_ADDR_2: &[u8; 4] = &[0x00, 0x00, 0x00, 0x02];
const IPV6_ADDR_1: &[u8; 16] = &[
0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
0x01,
];
const IPV6_ADDR_2: &[u8; 16] = &[
0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
0x02,
];
const PORT_80: &[u8; 2] = &[0x00, 80];
const IPV4_ADDR_SIZE: &[u8; 2] = &[0x00, IPV4_SIZE as u8];
const IPV6_ADDR_SIZE: &[u8; 2] = &[0x00, IPV6_SIZE as u8];
async fn send_v4(sender: &mut MemorySocket) -> io::Result<()> {
sender.write_all(&PPV2_SIGNATURE).await?; sender.write_all(&[PPV2_PROXY]).await?; sender.write_all(&[TCP_IPV4]).await?; sender.write_all(IPV4_ADDR_SIZE).await?; sender.write_all(IPV4_ADDR_1).await?; sender.write_all(IPV4_ADDR_2).await?; sender.write_all(PORT_80).await?; sender.write_all(PORT_80).await?; sender.write_all(TEST_DATA).await }
async fn send_v6(sender: &mut MemorySocket) -> io::Result<()> {
sender.write_all(&PPV2_SIGNATURE).await?; sender.write_all(&[PPV2_PROXY]).await?; sender.write_all(&[TCP_IPV6]).await?; sender.write_all(IPV6_ADDR_SIZE).await?; sender.write_all(IPV6_ADDR_1).await?; sender.write_all(IPV6_ADDR_2).await?; sender.write_all(PORT_80).await?; sender.write_all(PORT_80).await?; sender.write_all(TEST_DATA).await }
#[test]
fn test_ipv4_proxy_protocol() {
let (mut sender, mut receiver) = MemorySocket::new_pair();
let original_addr = NetworkAddress::mock();
let server = async move {
send_v4(&mut sender).await.expect("Successful send");
};
let reader = read_header(&original_addr, &mut receiver);
let client = async move {
let addr = reader.await.expect("An address");
let addresses: Vec<_> = addr.to_socket_addrs().unwrap().collect();
let socket_addr = addresses.first().unwrap();
assert_eq!(IpAddr::V4(Ipv4Addr::from(0x0000000001)), socket_addr.ip());
assert_eq!(80, socket_addr.port());
};
block_on(join(server, client));
let check_data = async move {
let data: &mut [u8; 4] = &mut [0; 4];
receiver.read_exact(data).await.unwrap();
assert_eq!(TEST_DATA, data);
};
block_on(check_data);
}
#[test]
fn test_ipv6_proxy_protocol() {
let (mut sender, mut receiver) = MemorySocket::new_pair();
let original_addr = NetworkAddress::mock();
let server = async move {
send_v6(&mut sender).await.expect("Successful send");
};
let reader = read_header(&original_addr, &mut receiver);
let client = async move {
let addr = reader.await.expect("An address");
let addresses: Vec<_> = addr.to_socket_addrs().unwrap().collect();
let socket_addr = addresses.first().unwrap();
assert_eq!(
IpAddr::V6(Ipv6Addr::from(0x00000001000000010000000100000001)),
socket_addr.ip()
);
assert_eq!(80, socket_addr.port());
};
block_on(join(server, client));
let check_data = async move {
let data: &mut [u8; 4] = &mut [0; 4];
receiver.read_exact(data).await.unwrap();
assert_eq!(TEST_DATA, data);
};
block_on(check_data);
}
#[test]
fn test_local_proxy_protocol() {
let address_bytes: [&[u8; 1]; 5] = [
&[LOCAL_PROTOCOL],
&[UDP_IPV4],
&[UDP_IPV6],
&[TCP_UNIX],
&[UDP_UNIX],
];
address_bytes
.iter()
.for_each(|addr| test_skip_address(addr));
}
fn test_skip_address(address_byte: &[u8; 1]) {
let (mut sender, mut receiver) = MemorySocket::new_pair();
let original_addr = NetworkAddress::mock();
let server = async move {
sender.write_all(&PPV2_SIGNATURE).await.unwrap(); sender.write_all(&[PPV2_PROXY]).await.unwrap(); sender.write_all(address_byte).await.unwrap(); sender.write_all(IPV4_ADDR_SIZE).await.unwrap(); sender.write_all(IPV4_ADDR_1).await.unwrap(); sender.write_all(IPV4_ADDR_2).await.unwrap(); sender.write_all(PORT_80).await.unwrap(); sender.write_all(PORT_80).await.unwrap(); sender.write_all(TEST_DATA).await.unwrap() };
let reader = read_header(&original_addr, &mut receiver);
let proxy_addr = original_addr.clone();
let client = async move {
let addr = reader.await.expect("An address");
assert_eq!(addr, proxy_addr.clone());
};
block_on(join(server, client));
let check_data = async move {
let data: &mut [u8; 4] = &mut [0; 4];
receiver.read_exact(data).await.unwrap();
assert_eq!(TEST_DATA, data);
};
block_on(check_data);
}
#[test]
fn test_error_handling() {
test_error_case(&[&[0; 12]]);
test_error_case(&[&PPV2_SIGNATURE, &[0x00]]);
test_error_case(&[&PPV2_SIGNATURE, &[0x22]]);
test_error_case(&[&PPV2_SIGNATURE, &[PPV2_PROXY], &[0x55], &[0x00, 0x00]]);
test_error_case(&[&PPV2_SIGNATURE, &[PPV2_PROXY], &[TCP_IPV4], &[0x00, 0x00]]);
test_error_case(&[&PPV2_SIGNATURE, &[PPV2_PROXY], &[TCP_IPV6], &[0x00, 0x00]]);
}
fn test_error_case(input: &[&[u8]]) {
let (mut sender, mut receiver) = MemorySocket::new_pair();
let original_addr = NetworkAddress::mock();
let server = async move {
for array in input {
sender.write_all(array).await.expect("Successful send");
}
};
let reader = read_header(&original_addr, &mut receiver);
let client = async move {
reader.await.expect_err("Expected error");
};
block_on(join(server, client));
}
}