// Extracts a usable sized symmetric key and IV for the stream cipher from the huge master key, and
// creates a CTR stream cipher.
func (s *Session) makeCipher() (cipher.Stream, error) {
// Create the key derivation function
hasher := func() hash.Hash { return s.hash.New() }
hkdf := hkdf.New(hasher, s.secret.Bytes(), hkdfSalt, hkdfInfo)
// Extract the symmetric key
key := make([]byte, s.keybits/8)
n, err := io.ReadFull(hkdf, key)
if n != len(key) || err != nil {
return nil, err
}
// Create the block cipher
block, err := s.crypter(key)
if err != nil {
return nil, err
}
// Extract the IV for the counter mode
iv := make([]byte, block.BlockSize())
n, err = io.ReadFull(hkdf, iv)
if n != len(iv) || err != nil {
return nil, err
}
// Create the stream cipher
return cipher.NewCTR(block, iv), nil
}
// ServeAgent serves the agent protocol on the given connection. It
// returns when an I/O error occurs.
func ServeAgent(agent Agent, c io.ReadWriter) error {
s := &server{agent}
var length [4]byte
for {
if _, err := io.ReadFull(c, length[:]); err != nil {
return err
}
l := binary.BigEndian.Uint32(length[:])
if l > maxAgentResponseBytes {
// We also cap requests.
return fmt.Errorf("agent: request too large: %d", l)
}
req := make([]byte, l)
if _, err := io.ReadFull(c, req); err != nil {
return err
}
repData := s.processRequestBytes(req)
if len(repData) > maxAgentResponseBytes {
return fmt.Errorf("agent: reply too large: %d bytes", len(repData))
}
binary.BigEndian.PutUint32(length[:], uint32(len(repData)))
if _, err := c.Write(length[:]); err != nil {
return err
}
if _, err := c.Write(repData); err != nil {
return err
}
}
}
func (s *Server) Handle(serial int, RpcAddr string) {
conn := s.conns[serial]
head := make([]byte, 2)
defer s.Close(serial)
for {
_, err := io.ReadFull(conn, head)
if err != nil {
fmt.Println(err)
break
}
var info_len uint16
buf := bytes.NewReader(head)
if err := binary.Read(buf, binary.BigEndian, &info_len); err != nil {
fmt.Println("binary.Read failed:", err)
break
}
body := make([]byte, info_len)
body_len, err := io.ReadFull(conn, body)
if err != nil {
fmt.Println(err)
break
}
reply := CallRpc(RpcAddr, "Arith.Multiply", int(info_len), int(body_len))
fmt.Printf("reply:%d\n", reply)
fmt.Println("len", info_len, body_len, string(body))
s.WriteTo(serial, body)
}
}
// recvMessage receives any message from the backend, or returns an error if
// a problem occurred while reading the message.
func (cn *conn) recvMessage() (byte, *readBuf, error) {
// workaround for a QueryRow bug, see exec
if cn.saveMessageType != 0 {
t, r := cn.saveMessageType, cn.saveMessageBuffer
cn.saveMessageType = 0
cn.saveMessageBuffer = nil
return t, r, nil
}
x := cn.scratch[:5]
_, err := io.ReadFull(cn.buf, x)
if err != nil {
return 0, nil, err
}
t := x[0]
b := readBuf(x[1:])
n := b.int32() - 4
var y []byte
if n <= len(cn.scratch) {
y = cn.scratch[:n]
} else {
y = make([]byte, n)
}
_, err = io.ReadFull(cn.buf, y)
if err != nil {
return 0, nil, err
}
return t, (*readBuf)(&y), nil
}
func TestPartialRead(t *testing.T) {
f, err := os.Open("testdata/gnu.tar")
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
defer f.Close()
tr := NewReader(f)
// Read the first four bytes; Next() should skip the last byte.
hdr, err := tr.Next()
if err != nil || hdr == nil {
t.Fatalf("Didn't get first file: %v", err)
}
buf := make([]byte, 4)
if _, err := io.ReadFull(tr, buf); err != nil {
t.Fatalf("Unexpected error: %v", err)
}
if expected := []byte("Kilt"); !bytes.Equal(buf, expected) {
t.Errorf("Contents = %v, want %v", buf, expected)
}
// Second file
hdr, err = tr.Next()
if err != nil || hdr == nil {
t.Fatalf("Didn't get second file: %v", err)
}
buf = make([]byte, 6)
if _, err := io.ReadFull(tr, buf); err != nil {
t.Fatalf("Unexpected error: %v", err)
}
if expected := []byte("Google"); !bytes.Equal(buf, expected) {
t.Errorf("Contents = %v, want %v", buf, expected)
}
}
func (self *Session) reader() {
log.Printf("session[%d] start reader...", self.id)
defer func() {
log.Println("reader quit...")
self.ctrl <- true
if self.autoReconnect {
self.reconnect <- true
} else {
self.events <- newEvent(EVENT_DISCONNECT, self, nil)
}
}()
header := make([]byte, 2)
for {
if _, err := io.ReadFull(self.conn, header); err != nil {
break
}
size := binary.BigEndian.Uint16(header)
log.Printf("size=%d", size)
data := make([]byte, size)
if _, err := io.ReadFull(self.conn, data); err != nil {
self.events <- newEvent(EVENT_RECV_ERROR, self, err)
break
}
log.Printf("len(data)=%d", len(data))
log.Printf("payload: %v", data)
api, payload, err := self.proto.Decode(data)
log.Printf("api=%v, payload=%v, err=%v", api, payload, err)
if err != nil {
self.events <- newEvent(EVENT_RECV_ERROR, self, err)
break
}
msg := NewMessage(api, payload)
self.events <- newEvent(EVENT_MESSAGE, self, msg)
}
}
func readN(r io.Reader, b []byte, n int) ([]byte, error) {
if n == 0 && b == nil {
return make([]byte, 0), nil
}
if cap(b) >= n {
b = b[:n]
_, err := io.ReadFull(r, b)
return b, err
}
b = b[:cap(b)]
pos := 0
for len(b) < n {
diff := n - len(b)
if diff > bytesAllocLimit {
diff = bytesAllocLimit
}
b = append(b, make([]byte, diff)...)
_, err := io.ReadFull(r, b[pos:])
if err != nil {
return nil, err
}
pos = len(b)
}
return b, nil
}
// readDirectoryHeader attempts to read a directory header from r.
// It returns io.ErrUnexpectedEOF if it cannot read a complete header,
// and ErrFormat if it doesn't find a valid header signature.
func readDirectoryHeader(f *File, r io.Reader) error {
var buf [directoryHeaderLen]byte
if _, err := io.ReadFull(r, buf[:]); err != nil {
return err
}
b := readBuf(buf[:])
if sig := b.uint32(); sig != directoryHeaderSignature {
return ErrFormat
}
f.CreatorVersion = b.uint16()
f.ReaderVersion = b.uint16()
f.Flags = b.uint16()
f.Method = b.uint16()
f.ModifiedTime = b.uint16()
f.ModifiedDate = b.uint16()
f.CRC32 = b.uint32()
f.CompressedSize = b.uint32()
f.UncompressedSize = b.uint32()
filenameLen := int(b.uint16())
extraLen := int(b.uint16())
commentLen := int(b.uint16())
b = b[4:] // skipped start disk number and internal attributes (2x uint16)
f.ExternalAttrs = b.uint32()
f.headerOffset = int64(b.uint32())
d := make([]byte, filenameLen+extraLen+commentLen)
if _, err := io.ReadFull(r, d); err != nil {
return err
}
f.Name = string(d[:filenameLen])
f.Extra = d[filenameLen : filenameLen+extraLen]
f.Comment = string(d[filenameLen+extraLen:])
return nil
}
func TestLargeMessage(t *testing.T) {
server, ct := setUp(t, 0, math.MaxUint32, normal)
callHdr := &CallHdr{
Host: "localhost",
Method: "foo.Large",
}
var wg sync.WaitGroup
for i := 0; i < 2; i++ {
wg.Add(1)
go func() {
defer wg.Done()
s, err := ct.NewStream(context.Background(), callHdr)
if err != nil {
t.Errorf("failed to open stream: %v", err)
}
if err := ct.Write(s, expectedRequestLarge, &Options{Last: true, Delay: false}); err != nil {
t.Errorf("failed to send data: %v", err)
}
p := make([]byte, len(expectedResponseLarge))
_, recvErr := io.ReadFull(s, p)
if recvErr != nil || !bytes.Equal(p, expectedResponseLarge) {
t.Errorf("Error: %v, want <nil>; Result len: %d, want len %d", recvErr, len(p), len(expectedResponseLarge))
}
_, recvErr = io.ReadFull(s, p)
if recvErr != io.EOF {
t.Errorf("Error: %v; want <EOF>", recvErr)
}
}()
}
wg.Wait()
ct.Close()
server.stop()
}
func DecryptIO(reader io.Reader, writer io.Writer, passphrase string) (mac []byte, e error) {
key := PassphraseToKey(passphrase)
hashMac := hmac.New(sha256.New, key)
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
iv := make([]byte, aes.BlockSize)
if _, err = io.ReadFull(reader, iv); err != nil {
return nil, err
}
stream := cipher.NewOFB(block, iv)
cipherReader := &cipher.StreamReader{S: stream, R: reader}
pp := make([]byte, len([]byte(passphrase)))
if _, err = io.ReadFull(cipherReader, pp); err != nil {
return nil, err
}
if passphrase != string(pp) {
return nil, errors.New("Incorrect passphrase")
}
mw := io.MultiWriter(writer, hashMac)
if _, err = io.Copy(mw, cipherReader); err != nil {
return nil, err
}
return hashMac.Sum(nil), nil
}
// The initial response from the datanode:
// +-----------------------------------------------------------+
// | varint length + BlockOpResponseProto |
// +-----------------------------------------------------------+
func (br *BlockReader) readBlockReadResponse(r io.Reader) (*hdfs.BlockOpResponseProto, error) {
varintBytes := make([]byte, binary.MaxVarintLen32)
_, err := io.ReadFull(r, varintBytes)
if err != nil {
return nil, err
}
respLength, varintLength := binary.Uvarint(varintBytes)
if varintLength < 1 {
return nil, io.ErrUnexpectedEOF
}
// We may have grabbed too many bytes when reading the varint.
respBytes := make([]byte, respLength)
extraLength := copy(respBytes, varintBytes[varintLength:])
_, err = io.ReadFull(r, respBytes[extraLength:])
if err != nil {
return nil, err
}
resp := &hdfs.BlockOpResponseProto{}
err = proto.Unmarshal(respBytes, resp)
if err != nil {
return nil, err
}
return resp, nil
}
// FromReader extracts data from a serialized DeleteOp into its concrete
// structure.
func (op *DeleteOp) FromReader(r io.Reader) error {
var b [4]byte
_, err := io.ReadFull(r, b[:]) //skip ZERO
if err != nil {
return err
}
name, err := readCStringFromReader(r)
if err != nil {
return err
}
op.Collection = string(name)
_, err = io.ReadFull(r, b[:]) //Grab the flags
if err != nil {
return err
}
op.Flags = uint32(getInt32(b[:], 0))
selectorAsSlice, err := ReadDocument(r)
if err != nil {
return err
}
op.Selector = &bson.D{}
err = bson.Unmarshal(selectorAsSlice, op.Selector)
if err != nil {
return err
}
return nil
}
// Unmarshal parses an identity.
func Unmarshal(in []byte) (*Identity, error) {
buf := sbuf.NewBufferFrom(in)
id := &Identity{
private: new([ed25519.PrivateKeySize]byte),
public: new([ed25519.PublicKeySize]byte),
}
_, err := io.ReadFull(buf, id.private[:])
if err != nil {
return nil, ErrInvalidIdentity
}
_, err = io.ReadFull(buf, id.public[:])
if err != nil {
return nil, ErrInvalidIdentity
}
if (buf.Len() % ed25519.PublicKeySize) != 0 {
return nil, ErrInvalidIdentity
}
for {
if buf.Len() == 0 {
break
}
peer := new([ed25519.PublicKeySize]byte)
io.ReadFull(buf, peer[:])
id.peers = append(id.peers, peer)
}
return id, nil
}
// NewReaderDict is like NewReader but uses a preset dictionary.
// NewReaderDict ignores the dictionary if the compressed data does not refer to it.
func NewReaderDict(r io.Reader, dict []byte) (io.ReadCloser, os.Error) {
z := new(reader)
if fr, ok := r.(flate.Reader); ok {
z.r = fr
} else {
z.r = bufio.NewReader(r)
}
_, err := io.ReadFull(z.r, z.scratch[0:2])
if err != nil {
return nil, err
}
h := uint(z.scratch[0])<<8 | uint(z.scratch[1])
if (z.scratch[0]&0x0f != zlibDeflate) || (h%31 != 0) {
return nil, HeaderError
}
if z.scratch[1]&0x20 != 0 {
_, err = io.ReadFull(z.r, z.scratch[0:4])
if err != nil {
return nil, err
}
checksum := uint32(z.scratch[0])<<24 | uint32(z.scratch[1])<<16 | uint32(z.scratch[2])<<8 | uint32(z.scratch[3])
if checksum != adler32.Checksum(dict) {
return nil, DictionaryError
}
z.decompressor = flate.NewReaderDict(z.r, dict)
} else {
z.decompressor = flate.NewReader(z.r)
}
z.digest = adler32.New()
return z, nil
}
func performOneRPC(ct ClientTransport) {
callHdr := &CallHdr{
Host: "localhost",
Method: "foo.Small",
}
s, err := ct.NewStream(context.Background(), callHdr)
if err != nil {
return
}
opts := Options{
Last: true,
Delay: false,
}
if err := ct.Write(s, expectedRequest, &opts); err == nil || err == io.EOF {
time.Sleep(5 * time.Millisecond)
// The following s.Recv()'s could error out because the
// underlying transport is gone.
//
// Read response
p := make([]byte, len(expectedResponse))
io.ReadFull(s, p)
// Read io.EOF
io.ReadFull(s, p)
}
}
func (c *Connection) readResponse() (*Response, error) {
// Read response header (token+length)
_, err := io.ReadFull(c.conn, c.headerBuf[:respHeaderLen])
if err != nil {
return nil, err
}
responseToken := int64(binary.LittleEndian.Uint64(c.headerBuf[:8]))
messageLength := binary.LittleEndian.Uint32(c.headerBuf[8:])
// Read the JSON encoding of the Response itself.
b := c.buf.takeBuffer(int(messageLength))
if _, err := io.ReadFull(c.conn, b[:]); err != nil {
c.bad = true
return nil, RqlConnectionError{err.Error()}
}
// Decode the response
var response = newCachedResponse()
if err := json.Unmarshal(b, response); err != nil {
c.bad = true
return nil, RqlDriverError{err.Error()}
}
response.Token = responseToken
return response, nil
}
func TestLargeMessage(t *testing.T) {
server, ct := setUp(t, 0, math.MaxUint32, normal)
callHdr := &CallHdr{
Host: "localhost",
Method: "foo.Large",
}
var wg sync.WaitGroup
for i := 0; i < 2; i++ {
wg.Add(1)
go func() {
defer wg.Done()
s, err := ct.NewStream(context.Background(), callHdr)
if err != nil {
t.Errorf("%v.NewStream(_, _) = _, %v, want _, <nil>", ct, err)
}
if err := ct.Write(s, expectedRequestLarge, &Options{Last: true, Delay: false}); err != nil && err != io.EOF {
t.Errorf("%v.Write(_, _, _) = %v, want <nil>", ct, err)
}
p := make([]byte, len(expectedResponseLarge))
if _, err := io.ReadFull(s, p); err != nil || !bytes.Equal(p, expectedResponseLarge) {
t.Errorf("io.ReadFull(_, %v) = _, %v, want %v, <nil>", err, p, expectedResponse)
}
if _, err = io.ReadFull(s, p); err != io.EOF {
t.Errorf("Failed to complete the stream %v; want <EOF>", err)
}
}()
}
wg.Wait()
ct.Close()
server.stop()
}
// decodeUintReader reads an encoded unsigned integer from an io.Reader.
// Used only by the Decoder to read the message length.
func decodeUintReader(r io.Reader, buf []byte) (x uint64, width int, err error) {
width = 1
n, err := io.ReadFull(r, buf[0:width])
if n == 0 {
return
}
b := buf[0]
if b <= 0x7f {
return uint64(b), width, nil
}
n = -int(int8(b))
if n > uint64Size {
err = errBadUint
return
}
width, err = io.ReadFull(r, buf[0:n])
if err != nil {
if err == io.EOF {
err = io.ErrUnexpectedEOF
}
return
}
// Could check that the high byte is zero but it's not worth it.
for _, b := range buf[0:width] {
x = x<<8 | uint64(b)
}
width++ // +1 for length byte
return
}
func TestHostnameInSNI(t *testing.T) {
for _, tt := range hostnameInSNITests {
c, s := net.Pipe()
go func(host string) {
Client(c, &Config{ServerName: host, InsecureSkipVerify: true}).Handshake()
}(tt.in)
var header [5]byte
if _, err := io.ReadFull(s, header[:]); err != nil {
t.Fatal(err)
}
recordLen := int(header[3])<<8 | int(header[4])
record := make([]byte, recordLen)
if _, err := io.ReadFull(s, record[:]); err != nil {
t.Fatal(err)
}
c.Close()
s.Close()
var m clientHelloMsg
if !m.unmarshal(record) {
t.Errorf("unmarshaling ClientHello for %q failed", tt.in)
continue
}
if tt.in != tt.out && m.serverName == tt.in {
t.Errorf("prohibited %q found in ClientHello: %x", tt.in, record)
}
if m.serverName != tt.out {
t.Errorf("expected %q not found in ClientHello: %x", tt.out, record)
}
}
}
func getUser(conn net.Conn) (user User, err error) {
const (
idVersion = 0 // \x01
version = 1
idUser = 1 // \x02
)
buf := make([]byte, 2)
if _, err = io.ReadFull(conn, buf); err != nil {
return
}
switch buf[idVersion] {
case version:
break
default:
err = errors.New(fmt.Sprintf("version %s not supported", buf[idVersion]))
return
}
userLen := buf[idUser]
username := make([]byte, userLen)
if _, err = io.ReadFull(conn, username); err != nil {
return
}
user, err = storage.Get("user:" + string(username))
return
}
// ReadTLV reads a type-length-value record from r.
func ReadTLV(r io.Reader) (byte, []byte, error) {
var typ [1]byte
if _, err := io.ReadFull(r, typ[:]); err != nil {
return 0, nil, fmt.Errorf("read message type: %s", err)
}
// Read the size of the message.
var sz int64
if err := binary.Read(r, binary.BigEndian, &sz); err != nil {
return 0, nil, fmt.Errorf("read message size: %s", err)
}
if sz == 0 {
return 0, nil, fmt.Errorf("invalid message size: %d", sz)
}
if sz >= MaxMessageSize {
return 0, nil, fmt.Errorf("max message size of %d exceeded: %d", MaxMessageSize, sz)
}
// Read the value.
buf := make([]byte, sz)
if _, err := io.ReadFull(r, buf); err != nil {
return 0, nil, fmt.Errorf("read message value: %s", err)
}
return typ[0], buf, nil
}
// readTxOut reads the next sequence of bytes from r as a transaction output
// (TxOut).
func readTxOut(r io.Reader, pver uint32, version uint32, to *TxOut) error {
buf := make([]byte, 8)
_, err := io.ReadFull(r, buf)
if err != nil {
return err
}
to.Value = int64(binary.LittleEndian.Uint64(buf))
count, err := readVarInt(r, pver)
if err != nil {
return err
}
// Prevent public key script larger than the max message size. It would
// be possible to cause memory exhaustion and panics without a sane
// upper bound on this count.
if count > uint64(maxMessagePayload) {
str := fmt.Sprintf("transaction output public key script is "+
"larger than max message size [count %d, max %d]",
count, maxMessagePayload)
return messageError("MsgTx.BtcDecode", str)
}
b := make([]byte, count)
_, err = io.ReadFull(r, b)
if err != nil {
return err
}
to.PkScript = b
return nil
}
func (this *ChunkReader) Read() (*alloc.Buffer, error) {
buffer := alloc.NewLargeBuffer()
if _, err := io.ReadFull(this.reader, buffer.Value[:2]); err != nil {
buffer.Release()
return nil, err
}
// There is a potential buffer overflow here. Large buffer is 64K bytes,
// while uin16 + 10 will be more than that
length := serial.BytesToUint16(buffer.Value[:2]) + AuthSize
if _, err := io.ReadFull(this.reader, buffer.Value[:length]); err != nil {
buffer.Release()
return nil, err
}
buffer.Slice(0, int(length))
authBytes := buffer.Value[:AuthSize]
payload := buffer.Value[AuthSize:]
actualAuthBytes := this.auth.Authenticate(nil, payload)
if !bytes.Equal(authBytes, actualAuthBytes) {
buffer.Release()
log.Debug("AuthenticationReader: Unexpected auth: ", authBytes)
return nil, transport.ErrorCorruptedPacket
}
buffer.Value = payload
return buffer, nil
}
func read(r io.Reader) (response []byte, err error) {
var lenbuf [PacketLengthBytes]byte
var length int
if _, err = io.ReadFull(r, lenbuf[:]); err != nil {
return
}
if lenbuf[0] != 0xce {
err = errors.New("Wrong reponse header")
return
}
length = (int(lenbuf[1]) << 24) +
(int(lenbuf[2]) << 16) +
(int(lenbuf[3]) << 8) +
int(lenbuf[4])
if length == 0 {
err = errors.New("Response should not be 0 length")
return
}
response = make([]byte, length)
_, err = io.ReadFull(r, response)
return
}
// recvMessage receives any message from the backend, or returns an error if
// a problem occurred while reading the message.
func (cn *conn) recvMessage(r *readBuf) (byte, error) {
// workaround for a QueryRow bug, see exec
if cn.saveMessageType != 0 {
t := cn.saveMessageType
*r = cn.saveMessageBuffer
cn.saveMessageType = 0
cn.saveMessageBuffer = nil
return t, nil
}
x := cn.scratch[:5]
_, err := io.ReadFull(cn.buf, x)
if err != nil {
return 0, err
}
// read the type and length of the message that follows
t := x[0]
n := int(binary.BigEndian.Uint32(x[1:])) - 4
var y []byte
if n <= len(cn.scratch) {
y = cn.scratch[:n]
} else {
y = make([]byte, n)
}
_, err = io.ReadFull(cn.buf, y)
if err != nil {
return 0, err
}
*r = y
return t, nil
}
//----------------------------------------------- handle logical server
func handleClient(conn net.Conn) {
defer conn.Close()
header := make([]byte, 2)
ch := make(chan []byte, 8192)
go protos.HubAgent(ch, conn)
for {
// header
n, err := io.ReadFull(conn, header)
if n == 0 && err == io.EOF {
break
} else if err != nil {
log.Println("error receving header:", err)
break
}
// data
size := int(header[0])<<8 | int(header[1])
data := make([]byte, size)
n, err = io.ReadFull(conn, data)
if err != nil {
log.Println("error receving msg:", err)
break
}
ch <- data
}
close(ch)
}
func init() {
if interfaces, err := net.Interfaces(); err == nil {
for _, i := range interfaces {
if i.Flags&net.FlagLoopback == 0 && len(i.HardwareAddr) > 0 {
hardwareAddr = i.HardwareAddr
break
}
}
}
if hardwareAddr == nil {
// If we failed to obtain the MAC address of the current computer,
// we will use a randomly generated 6 byte sequence instead and set
// the multicast bit as recommended in RFC 4122.
hardwareAddr = make([]byte, 6)
_, err := io.ReadFull(rand.Reader, hardwareAddr)
if err != nil {
panic(err)
}
hardwareAddr[0] = hardwareAddr[0] | 0x01
}
// initialize the clock sequence with a random number
var clockSeqRand [2]byte
io.ReadFull(rand.Reader, clockSeqRand[:])
clockSeq = uint32(clockSeqRand[1])<<8 | uint32(clockSeqRand[0])
}
// Scans a file for checksum errors and returns all the corrupt ranges and
// errors encountered.
func groupChecksumVerify(fpr io.Reader) ([]*groupCorruptRange, []error) {
header, checksumInterval, err := readGroupHeader(fpr)
if err != nil {
return []*groupCorruptRange{&groupCorruptRange{0, math.MaxUint32}}, []error{err}
}
buf := make([]byte, checksumInterval+4)
copy(buf, header)
if _, err := io.ReadFull(fpr, buf[len(header):]); err != nil {
return []*groupCorruptRange{&groupCorruptRange{0, math.MaxUint32}}, []error{err}
}
start := uint32(0)
stop := checksumInterval - 1
var corruptions []*groupCorruptRange
var errs []error
for {
if murmur3.Sum32(buf[:checksumInterval]) != binary.BigEndian.Uint32(buf[checksumInterval:]) {
corruptions = append(corruptions, &groupCorruptRange{start, stop})
}
start = stop + 1
stop = stop + checksumInterval
if _, err := io.ReadFull(fpr, buf); err != nil {
corruptions = append(corruptions, &groupCorruptRange{start, math.MaxUint32})
errs = append(errs, err)
break
}
}
return corruptions, errs
}
// call sends an RPC to the agent. On success, the reply is
// unmarshaled into reply and replyType is set to the first byte of
// the reply, which contains the type of the message.
func (c *client) call(req []byte) (reply interface{}, err error) {
c.mu.Lock()
defer c.mu.Unlock()
msg := make([]byte, 4+len(req))
binary.BigEndian.PutUint32(msg, uint32(len(req)))
copy(msg[4:], req)
if _, err = c.conn.Write(msg); err != nil {
return nil, clientErr(err)
}
var respSizeBuf [4]byte
if _, err = io.ReadFull(c.conn, respSizeBuf[:]); err != nil {
return nil, clientErr(err)
}
respSize := binary.BigEndian.Uint32(respSizeBuf[:])
if respSize > maxAgentResponseBytes {
return nil, clientErr(err)
}
buf := make([]byte, respSize)
if _, err = io.ReadFull(c.conn, buf); err != nil {
return nil, clientErr(err)
}
reply, err = unmarshal(buf)
if err != nil {
return nil, clientErr(err)
}
return reply, err
}
// read response from the network connection.
func (s *Session) read() ([]byte, error) {
if !s.Available() {
return nil, ErrCannotRead
}
buf := make([]byte, 4)
var size int32
// first 4 bytes are always size of message
if count, err := io.ReadFull(s.conn, buf); err == nil && count == 4 {
sbuf := bytes.NewBuffer(buf)
binary.Read(sbuf, binary.BigEndian, &size)
data := make([]byte, size)
// read rest of message and return it if no errors
count, err := io.ReadFull(s.conn, data)
if err != nil {
if err == syscall.EPIPE {
s.conn.Close()
}
s.active = false
return nil, err
}
if count != int(size) {
s.active = false
return nil, errors.New(fmt.Sprintf("data length: %d, only read: %d", len(data), count))
}
return data, nil
}
return nil, nil
}