lnd.xprv/brontide/noise_test.go

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package brontide
import (
"bytes"
"io"
"math"
"net"
"sync"
"testing"
"github.com/lightningnetwork/lnd/lnwire"
"github.com/roasbeef/btcd/btcec"
)
func establishTestConnection() (net.Conn, net.Conn, error) {
// First, generate the long-term private keys both ends of the connection
// within our test.
localPriv, err := btcec.NewPrivateKey(btcec.S256())
if err != nil {
return nil, nil, err
}
remotePriv, err := btcec.NewPrivateKey(btcec.S256())
if err != nil {
return nil, nil, err
}
// Having a port of ":0" means a random port, and interface will be
// chosen for our listener.
addr := ":0"
// Our listener will be local, and the connection remote.
listener, err := NewListener(localPriv, addr)
if err != nil {
return nil, nil, err
}
defer listener.Close()
netAddr := &lnwire.NetAddress{
IdentityKey: localPriv.PubKey(),
Address: listener.Addr().(*net.TCPAddr),
}
// Initiate a connection with a separate goroutine, and listen with our
// main one. If both errors are nil, then encryption+auth was succesful.
errChan := make(chan error)
connChan := make(chan net.Conn)
go func() {
conn, err := Dial(remotePriv, netAddr)
errChan <- err
connChan <- conn
}()
localConn, listenErr := listener.Accept()
if listenErr != nil {
return nil, nil, listenErr
}
if dialErr := <-errChan; dialErr != nil {
return nil, nil, dialErr
}
remoteConn := <-connChan
return localConn, remoteConn, nil
}
func TestConnectionCorrectness(t *testing.T) {
// Create a test connection, grabbing either side of the connection
// into local variables. If the initial crypto handshake fails, then
// we'll get a non-nil error here.
localConn, remoteConn, err := establishTestConnection()
if err != nil {
t.Fatalf("unable to establish test connection: %v", err)
}
// Test out some message full-message reads.
for i := 0; i < 10; i++ {
msg := []byte("hello" + string(i))
if _, err := localConn.Write(msg); err != nil {
t.Fatalf("remote conn failed to write: %v", err)
}
readBuf := make([]byte, len(msg))
if _, err := remoteConn.Read(readBuf); err != nil {
t.Fatalf("local conn failed to read: %v", err)
}
if !bytes.Equal(readBuf, msg) {
t.Fatalf("messages don't match, %v vs %v",
string(readBuf), string(msg))
}
}
// Now try incremental message reads. This simulates first writing a
// message header, then a message body.
outMsg := []byte("hello world")
if _, err := localConn.Write(outMsg); err != nil {
t.Fatalf("remote conn failed to write: %v", err)
}
readBuf := make([]byte, len(outMsg))
if _, err := remoteConn.Read(readBuf[:len(outMsg)/2]); err != nil {
t.Fatalf("local conn failed to read: %v", err)
}
if _, err := remoteConn.Read(readBuf[len(outMsg)/2:]); err != nil {
t.Fatalf("local conn failed to read: %v", err)
}
if !bytes.Equal(outMsg, readBuf) {
t.Fatalf("messages don't match, %v vs %v",
string(readBuf), string(outMsg))
}
}
func TestMaxPayloadLength(t *testing.T) {
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b := Machine{}
b.split()
// Create a payload that's juust over the maximum alloted payload
// length.
payloadToReject := make([]byte, math.MaxUint16+1)
var buf bytes.Buffer
// A write of the payload generated above to the state machine should
// be rejected as it's over the max payload length.
err := b.WriteMessage(&buf, payloadToReject)
if err != ErrMaxMessageLengthExceeded {
t.Fatalf("payload is over the max allowed length, the write " +
"should have been rejected")
}
// Generate another payload which should be accepted as a valid
// payload.
payloadToAccept := make([]byte, math.MaxUint16-1)
if err := b.WriteMessage(&buf, payloadToAccept); err != nil {
t.Fatalf("write for payload was rejected, should have been " +
"accepted")
}
// Generate a final payload which is juuust over the max payload length
// when the MAC is accounted for.
payloadToReject = make([]byte, math.MaxUint16+1)
// This payload should be rejected.
err = b.WriteMessage(&buf, payloadToReject)
if err != ErrMaxMessageLengthExceeded {
t.Fatalf("payload is over the max allowed length, the write " +
"should have been rejected")
}
}
func TestWriteMessageChunking(t *testing.T) {
// Create a test connection, grabbing either side of the connection
// into local variables. If the initial crypto handshake fails, then
// we'll get a non-nil error here.
localConn, remoteConn, err := establishTestConnection()
if err != nil {
t.Fatalf("unable to establish test connection: %v", err)
}
// Attempt to write a message which is over 3x the max allowed payload
// size.
largeMessage := bytes.Repeat([]byte("kek"), math.MaxUint16*3)
// Launch a new goroutine to write the large message generated above in
// chunks. We spawn a new goroutine because otherwise, we may block as
// the kernal waits for the buffer to flush.
var wg sync.WaitGroup
wg.Add(1)
go func() {
bytesWritten, err := localConn.Write(largeMessage)
if err != nil {
t.Fatalf("unable to write message: %v", err)
}
// The entire message should have been written out to the remote
// connection.
if bytesWritten != len(largeMessage) {
t.Fatalf("bytes not fully written!")
}
wg.Done()
}()
// Attempt to read the entirety of the message generated above.
buf := make([]byte, len(largeMessage))
if _, err := io.ReadFull(remoteConn, buf); err != nil {
t.Fatalf("unable to read message: %v", err)
}
wg.Wait()
// Finally, the message the remote end of the connection received
// should be identical to what we sent from the local connection.
if !bytes.Equal(buf, largeMessage) {
t.Fatalf("bytes don't match")
}
}