func (client *Conn) proxy(rwc io.ReadWriteCloser) (bool, error) {
var closed bool
for job := range client.jobs {
if closed {
job.results <- rillResult{err: ErrClosedConnection{}}
continue
}
switch job.op {
case _read:
n, err := rwc.Read(job.data)
job.results <- rillResult{n, err}
if err != nil {
rwc.Close()
return false, err
}
case _write:
n, err := rwc.Write(job.data)
job.results <- rillResult{n, err}
if err != nil {
rwc.Close()
return false, err
}
case _close:
closed = true
err := rwc.Close()
job.results <- rillResult{err: err}
return true, err
}
}
return false, nil
}
func fakeServer(t *testing.T, rw io.ReadWriteCloser, fakeReply fakeResponseMap) {
b := bufio.NewReader(rw)
_, err := rw.Write([]byte(fakeReply[""]))
if err != nil {
t.Errorf("fakeServer: Banner write causes %s", err)
}
for {
line, err := b.ReadString('\n')
if err != nil {
if err != io.EOF {
t.Errorf("fakeServer: Reading causes %s", err)
}
break
}
reply := fakeReply[strings.TrimSpace(line)]
if reply == "" {
break
}
_, err = rw.Write([]byte(reply))
if err != nil {
t.Errorf("fakeServer: Writing causes %s", err)
break
}
}
rw.Close()
}
// logs a player in from an incoming connection, creating a player
// in the world if they successfully connect
func Login(rwc io.ReadWriteCloser, ip net.Addr) {
showTitle(rwc)
for i := 0; i < retries; i++ {
user, err := authenticate(rwc, ip)
switch err {
case nil:
world.SpawnPlayer(rwc, user)
return
case ErrAuth:
log.Printf("Failed login from %s", ip)
_, err = rwc.Write([]byte("Incorrect username or password, please try again\n"))
if err != nil {
break
}
case ErrDupe:
ok, err := handleDupe(user, rwc)
if ok && err == nil {
kick(user)
world.SpawnPlayer(rwc, user)
return
}
case ErrNotSetup:
rwc.Close()
return
}
if err != nil {
log.Printf("Error during login of user from %s: %s", ip, err)
return
}
}
}
// secureConnection creates a secure connection from an insecure connection. It
// does this by performing the handshake, then returning an io.ReadWriteCloser
// that can be used to communicate securely.
func secureConnection(conn io.ReadWriteCloser) (io.ReadWriteCloser, error) {
var priv, pub *[32]byte
var err error
pub, priv, err = box.GenerateKey(rand.Reader)
if err != nil {
return nil, err
}
if _, err := conn.Write(pub[:]); err != nil {
return nil, err
}
if _, err := io.ReadFull(conn, pub[:]); err != nil {
return nil, err
}
return struct {
io.Reader
io.Writer
io.Closer
}{
NewSecureReader(conn, priv, pub),
NewSecureWriter(conn, priv, pub),
conn,
}, nil
}
func (m *CircularMPI) handleMessage(conn io.ReadWriteCloser) {
defer conn.Close()
buf, err := ioutil.ReadAll(conn)
if err != nil {
m.logger.Println(err)
conn.Write([]byte{'N', 'O'})
return
}
conn.Write([]byte{'O', 'K'})
go func() {
states := make(map[string]Versioner)
data := bytes.NewBuffer(buf)
st, err := decodeData(data)
if err != nil {
m.logger.Println(err)
}
states = st
m.logger.Println(m.me, " Received ")
m.cleanLocalStreams(states)
m.prepareData(states)
if len(states) == 0 {
m.logger.Println("Nothing to send Going")
return
}
// Ne need to clean local streams
for key, v := range states {
m.Dummy.Write(key, v)
}
m.sendData(states)
}()
}
// New wraps a ReadWriterCloser and uses the underlying reader and writer to
// perform a key exchange and then returns a secured connection.
func New(conn io.ReadWriteCloser) (*SecureConn, error) {
// Generate key pair
priv, pub, err := box.GenerateKey(rand.Reader)
if err != nil {
return nil, err
}
// Send our public key
// This is done in a goroutine so that read/writes can happen concurrently
// in the event that the reader and writer are directly connected (for
// example via io.Pipe)
done := make(chan error)
go func() {
_, err := conn.Write(pub[:])
done <- err
}()
// Read their public key
key := &[32]byte{}
if _, err := io.ReadFull(conn, key[:]); err != nil {
return nil, err
}
if err := <-done; err != nil {
return nil, err
}
// Return a secured connection
return &SecureConn{
NewSecureReader(conn, priv, key),
NewSecureWriter(conn, priv, key),
conn,
DefaultStreamingChunkSize,
}, nil
}
func doLoris(conn io.ReadWriteCloser, victimUri *url.URL, activeConnectionsCh chan<- int, requestHeader []byte) {
defer conn.Close()
if _, err := conn.Write(requestHeader); err != nil {
log.Printf("Cannot write requestHeader=[%v]: [%s]\n", requestHeader, err)
return
}
activeConnectionsCh <- 1
defer func() { activeConnectionsCh <- -1 }()
readerStopCh := make(chan int, 1)
go nullReader(conn, readerStopCh)
for i := 0; i < *contentLength; i++ {
select {
case <-readerStopCh:
return
case <-time.After(*sleepInterval):
}
if _, err := conn.Write(sharedWriteBuf); err != nil {
log.Printf("Error when writing %d byte out of %d bytes: [%s]\n", i, *contentLength, err)
return
}
}
}
func PipeThenClose(src, dst io.ReadWriteCloser) {
defer dst.Close()
buf := make([]byte, MaxPacketSize)
for {
n, err := src.Read(buf)
// read may return EOF with n > 0
// should always process n > 0 bytes before handling error
if n > 0 {
// Note: avoid overwrite err returned by Read.
if _, err := dst.Write(buf[0:n]); err != nil {
log.Println("write:", err)
break
}
}
if err != nil {
// Always "use of closed network connection", but no easy way to
// identify this specific error. So just leave the error along for now.
// More info here: https://code.google.com/p/go/issues/detail?id=4373
/*
if bool(Debug) && err != io.EOF {
Debug.Println("read:", err)
}
*/
log.Println("read:", err)
break
}
}
}
func acceptAndWrite(rwc io.ReadWriteCloser, t *testing.T) {
// write
buf := []byte(msg)
for len(buf) > 0 {
n, err := rwc.Write(buf)
if err != nil {
t.Fatalf("write: %s", err)
}
buf = buf[n:]
}
// read
buf2 := make([]byte, len(msg))
free := buf2
for len(free) > 0 {
n, err := rwc.Read(free)
if err != nil {
t.Fatalf("write/read: %s", err)
}
free = free[n:]
}
if string(buf2) != msg {
t.Fatalf("write/read crc fail")
}
// close
if err := rwc.Close(); err != nil {
t.Fatalf("write/close: %s", err)
}
}
func shareEphPubKey(conn io.ReadWriteCloser, locEphPub *[32]byte) (remEphPub *[32]byte, err error) {
var err1, err2 error
var wg sync.WaitGroup
wg.Add(2)
go func() {
defer wg.Done()
_, err1 = conn.Write(locEphPub[:])
}()
go func() {
defer wg.Done()
remEphPub = new([32]byte)
_, err2 = io.ReadFull(conn, remEphPub[:])
}()
wg.Wait()
if err1 != nil {
return nil, err1
}
if err2 != nil {
return nil, err2
}
return remEphPub, nil
}
func (g *GraphiteTcpServer) handleConnection(conn io.ReadWriteCloser) {
scanner := bufio.NewScanner(conn)
defer conn.Close()
// Create a channel for the metrics
addChan := make(chan metrics.Metric, 1000)
g.backend.AddMetricChan(addChan)
defer close(addChan)
for scanner.Scan() {
// PARSE METRIC LINES
//err, m :=
err, m := parseGraphiteLine(scanner.Text())
if err == nil {
// Send parsed metric to the back-end
addChan <- m
} else {
conn.Write([]byte(err.Error()))
}
}
if err := scanner.Err(); err != nil {
fmt.Printf("Error while parsing text: %v", err)
}
}
func main() {
var stdout bool
var reopen bool
var delay int
flag.BoolVar(&stdout, "stdout", false, "Write the specified frame to stdout instead of to a tty.")
flag.StringVar(&tty, "tty", "/dev/tty.zigbee", "The tty device to use.")
flag.IntVar(&delay, "delay", 0, "The number of seconds to delay before re-opening the tty after a reset command.")
flag.Parse()
args := flag.Args()
length := len(args) - 2
if length < 0 || length > 255 {
fmt.Printf("usage: cc2530-frame {options} [subSysId] [cmdId] [hex...]\n")
flag.PrintDefaults()
os.Exit(1)
}
frame := buildFrame(args)
if frame[2] == 0x41 && frame[3] == 0x00 && !stdout {
reopen = true
}
var io io.ReadWriteCloser
if stdout {
io = os.Stdout
} else {
io = open(tty)
}
io.Write(frame)
if reopen {
io.Close()
time.Sleep(time.Second * time.Duration(delay))
io = open(tty)
io.Write([]byte{0xef})
io.Close()
io = open(tty)
}
if !stdout {
for {
responseSubsysId := processResponse(io)
if responseSubsysId == (frame[2]|0x20) || responseSubsysId == frame[2] {
// we received a response that wasn't for the command we
// sent
break
}
}
}
}
func send(s io.ReadWriteCloser, msg []byte) int {
n, err := s.Write(msg)
if err != nil {
log.Print(err)
return 0
}
return n
}
func SerialWrite(serialObject io.ReadWriteCloser, openClose string) error {
// openClose
// "OC0": open command
// "OC1": close command
_, err := serialObject.Write([]byte(openClose))
if err != nil {
return err
}
return nil
}
// CallTestSequence to Davis Weather Station
// it must return "TEST"
func CallTestSequence(connection io.ReadWriteCloser) string {
nb, err := connection.Write([]byte("TEST\n"))
check(err)
buf := make([]byte, 100)
nb, err = connection.Read(buf)
check(err)
log.Infof("%d bytes: %s\n", nb, string(buf))
return string(buf)
}
// clientRead sends input from Stdin to c.
func clientRead(c io.ReadWriteCloser) {
s := bufio.NewScanner(os.Stdin)
prompt := "> "
fmt.Print(prompt)
for s.Scan() {
if _, err := c.Write([]byte(s.Text())); err != nil {
log.Fatal(err)
}
}
}
func CopyFromTo(r, w io.ReadWriteCloser, buf []byte) {
defer CloseConn(r)
if buf != nil && len(buf) > 0 {
_, err := w.Write(buf)
if err != nil {
return
}
}
io.Copy(r, w)
}
func TransportHandshake(keypair DHKeys, wire io.ReadWriteCloser,
verify func([]byte) bool) (io.ReadWriteCloser, error) {
eph_keypair := dh_gen_key(2048)
done := make(chan bool)
go func() {
// Send longterm public key
_, err := wire.Write(keypair.Public)
if err != nil {
return
}
// Send ephemeral public key
_, err = wire.Write(eph_keypair.Public)
if err != nil {
return
}
done <- true
}()
// Read longterm public key
their_pubkey := make([]byte, 2048/8)
_, err := io.ReadFull(wire, their_pubkey)
if err != nil {
return nil, errors.New(fmt.Sprintf("Couldn't read their longterm key (%s)", err.Error()))
}
if !verify(their_pubkey) {
return nil, ErrMacNoMatch
}
// Read ephemeral public key
their_eph_pubkey := make([]byte, 2048/8)
_, err = io.ReadFull(wire, their_eph_pubkey)
if err != nil {
return nil, errors.New("Couldn't read their shortterm key")
}
// Generate secret
secret1 := dh_gen_secret(keypair.Private, their_pubkey)
secret2 := dh_gen_secret(eph_keypair.Private, their_eph_pubkey)
secret := append(secret1, secret2...)
// Generate r and w secrets by appending THEIR eph pubkey for w, and OUR eph pubkey for r
write_secret := append(secret, their_eph_pubkey...)
read_secret := append(secret, eph_keypair.Public...)
write_key := KeyedHash(write_secret, []byte("KiSS-1.0"))
read_key := KeyedHash(read_secret, []byte("KiSS-1.0"))
readk := make([]byte, 56)
copy(readk[:], read_key)
writek := make([]byte, 56)
copy(writek[:], write_key)
<-done
return MessToStream(&kiss_mess_ctx{make_chugger(readk),
make_chugger(writek), wire}), nil
}
func echoMsg(s io.ReadWriteCloser) error {
b2 := make([]byte, 1024)
n, err := s.Read(b2)
if err != nil {
return err
}
n, err = s.Write(b2[:n])
if err != nil {
return err
}
return nil
}
func echo(rwc io.ReadWriteCloser, handler func(string) string) {
for {
buf := make([]byte, 256)
n, err := rwc.Read(buf)
if err != nil {
log.Println(err)
rwc.Close()
return
}
s := strings.TrimRight(string(buf[:n]), "\n")
s = handler(s)
_, err = rwc.Write([]byte(s))
}
}
func SendQueuedMessagesTo(p io.ReadWriteCloser) {
for {
message := <-messageQueue
if buf, err := message.MarshalBinary(); err != nil {
messageQueueErr.Printf("Failed marshal message %x %x",
err.Error(), message)
} else if _, err := p.Write(buf); err != nil {
messageQueueErr.Printf("Failed to send message %x %x",
err.Error(), message)
} else {
messageQueueOut.Printf("Completed message send %x", message)
}
}
}
// LLObfsServerHandshake negotiates low-level obfuscation (content hiding but no
// volume hiding) on a network connection, acting as the server. The master
// secret must be provided.
func LLObfsServerHandshake(secret []byte, transport io.ReadWriteCloser) (io.ReadWriteCloser, error) {
// Client needs to send proof that they actually have our secret
proof := make([]byte, 64)
_, err := io.ReadFull(transport, proof)
if err != nil {
return nil, err
}
kilog.FineDebug("llobfs: server obtained proof")
// We need to verify proof
nonce := proof[:32]
hash := proof[32:]
if subtle.ConstantTimeCompare(natrium.SecureHash(secret, nonce), hash) != 1 {
return nil, errors.New("Client did not give the right proof")
}
// Generate our ephemeral keys
our_keys := UDHGenerateKeys()
// Send our public key
_, err = transport.Write(our_keys.Public)
if err != nil {
return nil, err
}
kilog.FineDebug("llobfs: server sent public key")
// Read their public key
their_public := make([]byte, 1536/8)
_, err = io.ReadFull(transport, their_public)
if err != nil {
return nil, err
}
kilog.FineDebug("llobfs: server read public key")
// Compute shared secret
shared_secret := UDHSecret(our_keys.Private, their_public)
// Read and write keys
read_key := natrium.SecureHash(shared_secret, []byte("llobfs-upstream-key"))
write_key := natrium.SecureHash(shared_secret, []byte("llobfs-downstream-key"))
// Create struct
toret := new(llobfsContext)
toret.read_chug, _ = rc4.NewCipher(read_key)
toret.write_chug, _ = rc4.NewCipher(write_key)
dummy := make([]byte, 1536)
toret.read_chug.XORKeyStream(dummy, dummy)
toret.write_chug.XORKeyStream(dummy, dummy)
toret.underlying = transport
return toret, nil
}
func (rpc *RPC) Accept(conn io.ReadWriteCloser) (*Peer, error) {
peer := NewPeer(rpc, conn)
buf := make([]byte, 32)
_, err := conn.Read(buf)
if err != nil {
return nil, err
}
// TODO: check handshake
_, err = conn.Write([]byte(HandshakeAccept))
if err != nil {
return nil, err
}
go peer.route()
return peer, nil
}
func help(cmd []string, c io.ReadWriteCloser) bool {
usage := `
Supported Commands:
PS list current running process
System <command> <args> WARN:Exec System Command!
Rollback <File path> <Postfix> Rollback updated file
Start <Process> Start process
Restart <Process> WARN:restart process
Stop <Process> WARN:stop process
Shutdown WARN:Stop whole service
Exit exit current connection
`
c.Write([]byte(usage))
return true
}
// WakeUp davis Station with sending bites sequence
func WakeUp(connection io.ReadWriteCloser) bool {
nb, err := connection.Write([]byte("\n"))
check(err)
buf := make([]byte, 10)
nb, err = connection.Read(buf)
check(err)
log.Infof("%d bytes read from USB port on Wake Up connection: %s\n", nb, string(buf))
if nb == 2 {
time.Sleep(time.Second * 2)
return true
} else {
return WakeUp(connection)
}
}
// NewSecureSession creates a new SecureSession around an io.ReadWriteCloser.
// NewSecureSession will generate a public & private key, and then send the
// private key to the peer. The peer is required to send its key as well.
func NewSecureSession(rwc io.ReadWriteCloser, kp *KeyPair) (*SecureSession, error) {
ss := &SecureSession{
kp: kp,
rwc: rwc,
}
// Need to perform a handshake. However we only write our key, and don't
// wait for theirs.
// This is so that we don't block, and give the peer's key time to come
// across the wire.
if _, err := rwc.Write(kp.PublicKey[:]); err != nil {
return nil, err
}
return ss, nil
}
func writeHeader(rwc io.ReadWriteCloser, seq uint64,
method string, data []byte) error {
var bh bytes.Buffer
var rerr error
setError(&rerr, binary.Write(&bh, binary.LittleEndian, seq))
setError(&rerr, binary.Write(&bh, binary.LittleEndian, int32(len(method))))
setError(&rerr, binary.Write(&bh, binary.LittleEndian, int32(len(data))))
_, err := bh.Write([]byte(method))
setError(&rerr, err)
if rerr != nil {
return rerr
}
_, err = rwc.Write(bh.Bytes())
return err
}
func sendJSON(conn io.ReadWriteCloser, json_data []byte, verb_type uint8) string {
// send the two header bytes
header := []byte{verb_type, uint8(len(json_data))} // len(json_data) MUST < 128
_, err := conn.Write(header)
checkErr("Unable to send header:", err)
// send the actual json-encoded data
_, err = conn.Write(json_data)
checkErr("Unable to send data:", err)
// wait for a response from the server
response := make([]byte, 255)
_, err = conn.Read(response)
checkErr("Unable to read response:", err)
return string(response)
}
func writeLCDMatrix(p *packet, s io.ReadWriteCloser) {
if debug {
fmt.Println("writeLCDMatrix")
}
s.Write([]byte(p.header))
s.Write([]byte(p.coord))
s.Write([]byte(p.dataR))
s.Write([]byte(p.dataG))
s.Write([]byte(p.terminator))
}
func (ms *MsocksService) on_auth(stream io.ReadWriteCloser) bool {
f, err := ReadFrame(stream)
if err != nil {
log.Error("%s", err)
return false
}
ft, ok := f.(*FrameAuth)
if !ok {
log.Error("unexpected package type")
return false
}
log.Notice("auth with username: %s, password: %s.",
ft.Username, ft.Password)
if ms.userpass != nil {
password1, ok := ms.userpass[ft.Username]
if !ok || (ft.Password != password1) {
log.Error("auth failed.")
fb := NewFrameResult(ft.Streamid, ERR_AUTH)
buf, err := fb.Packed()
_, err = stream.Write(buf.Bytes())
if err != nil {
log.Error("%s", err)
return false
}
return false
}
}
fb := NewFrameResult(ft.Streamid, ERR_NONE)
buf, err := fb.Packed()
if err != nil {
log.Error("%s", err)
return false
}
_, err = stream.Write(buf.Bytes())
if err != nil {
log.Error("%s", err)
return false
}
log.Info("auth passed.")
return true
}