// recvMessage is used internally to receive a message; it blocks for timeout
func (p *Peer) recvMessage() (wire.Message, error) {
p.conn.SetReadDeadline(time.Now().Add(timeoutRecv))
version := atomic.LoadUint32(&p.version)
msg, _, err := wire.ReadMessage(p.conn, version, p.network)
return msg, err
}
// TestMessage tests the Read/WriteMessage and Read/WriteMessageN API.
func TestMessage(t *testing.T) {
pver := wire.ProtocolVersion
// Create the various types of messages to test.
// MsgVersion.
addrYou := &net.TCPAddr{IP: net.ParseIP("192.168.0.1"), Port: 8333}
you, err := wire.NewNetAddress(addrYou, wire.SFNodeNetwork)
if err != nil {
t.Errorf("NewNetAddress: %v", err)
}
you.Timestamp = time.Time{} // Version message has zero value timestamp.
addrMe := &net.TCPAddr{IP: net.ParseIP("127.0.0.1"), Port: 8333}
me, err := wire.NewNetAddress(addrMe, wire.SFNodeNetwork)
if err != nil {
t.Errorf("NewNetAddress: %v", err)
}
me.Timestamp = time.Time{} // Version message has zero value timestamp.
msgVersion := wire.NewMsgVersion(me, you, 123123, 0)
msgVerack := wire.NewMsgVerAck()
msgGetAddr := wire.NewMsgGetAddr()
msgAddr := wire.NewMsgAddr()
msgGetBlocks := wire.NewMsgGetBlocks(&wire.ShaHash{})
msgBlock := &blockOne
msgInv := wire.NewMsgInv()
msgGetData := wire.NewMsgGetData()
msgNotFound := wire.NewMsgNotFound()
msgTx := wire.NewMsgTx()
msgPing := wire.NewMsgPing(123123)
msgPong := wire.NewMsgPong(123123)
msgGetHeaders := wire.NewMsgGetHeaders()
msgHeaders := wire.NewMsgHeaders()
msgAlert := wire.NewMsgAlert([]byte("payload"), []byte("signature"))
msgMemPool := wire.NewMsgMemPool()
msgFilterAdd := wire.NewMsgFilterAdd([]byte{0x01})
msgFilterClear := wire.NewMsgFilterClear()
msgFilterLoad := wire.NewMsgFilterLoad([]byte{0x01}, 10, 0, wire.BloomUpdateNone)
bh := wire.NewBlockHeader(&wire.ShaHash{}, &wire.ShaHash{}, 0, 0)
msgMerkleBlock := wire.NewMsgMerkleBlock(bh)
msgReject := wire.NewMsgReject("block", wire.RejectDuplicate, "duplicate block")
tests := []struct {
in wire.Message // Value to encode
out wire.Message // Expected decoded value
pver uint32 // Protocol version for wire encoding
btcnet wire.BitcoinNet // Network to use for wire encoding
bytes int // Expected num bytes read/written
}{
{msgVersion, msgVersion, pver, wire.MainNet, 125},
{msgVerack, msgVerack, pver, wire.MainNet, 24},
{msgGetAddr, msgGetAddr, pver, wire.MainNet, 24},
{msgAddr, msgAddr, pver, wire.MainNet, 25},
{msgGetBlocks, msgGetBlocks, pver, wire.MainNet, 61},
{msgBlock, msgBlock, pver, wire.MainNet, 239},
{msgInv, msgInv, pver, wire.MainNet, 25},
{msgGetData, msgGetData, pver, wire.MainNet, 25},
{msgNotFound, msgNotFound, pver, wire.MainNet, 25},
{msgTx, msgTx, pver, wire.MainNet, 34},
{msgPing, msgPing, pver, wire.MainNet, 32},
{msgPong, msgPong, pver, wire.MainNet, 32},
{msgGetHeaders, msgGetHeaders, pver, wire.MainNet, 61},
{msgHeaders, msgHeaders, pver, wire.MainNet, 25},
{msgAlert, msgAlert, pver, wire.MainNet, 42},
{msgMemPool, msgMemPool, pver, wire.MainNet, 24},
{msgFilterAdd, msgFilterAdd, pver, wire.MainNet, 26},
{msgFilterClear, msgFilterClear, pver, wire.MainNet, 24},
{msgFilterLoad, msgFilterLoad, pver, wire.MainNet, 35},
{msgMerkleBlock, msgMerkleBlock, pver, wire.MainNet, 110},
{msgReject, msgReject, pver, wire.MainNet, 79},
}
t.Logf("Running %d tests", len(tests))
for i, test := range tests {
// Encode to wire format.
var buf bytes.Buffer
nw, err := wire.WriteMessageN(&buf, test.in, test.pver, test.btcnet)
if err != nil {
t.Errorf("WriteMessage #%d error %v", i, err)
continue
}
// Ensure the number of bytes written match the expected value.
if nw != test.bytes {
t.Errorf("WriteMessage #%d unexpected num bytes "+
"written - got %d, want %d", i, nw, test.bytes)
}
// Decode from wire format.
rbuf := bytes.NewReader(buf.Bytes())
nr, msg, _, err := wire.ReadMessageN(rbuf, test.pver, test.btcnet)
if err != nil {
t.Errorf("ReadMessage #%d error %v, msg %v", i, err,
spew.Sdump(msg))
continue
}
if !reflect.DeepEqual(msg, test.out) {
t.Errorf("ReadMessage #%d\n got: %v want: %v", i,
spew.Sdump(msg), spew.Sdump(test.out))
continue
}
// Ensure the number of bytes read match the expected value.
if nr != test.bytes {
t.Errorf("ReadMessage #%d unexpected num bytes read - "+
"got %d, want %d", i, nr, test.bytes)
}
}
// Do the same thing for Read/WriteMessage, but ignore the bytes since
// they don't return them.
t.Logf("Running %d tests", len(tests))
for i, test := range tests {
// Encode to wire format.
var buf bytes.Buffer
err := wire.WriteMessage(&buf, test.in, test.pver, test.btcnet)
if err != nil {
t.Errorf("WriteMessage #%d error %v", i, err)
continue
}
// Decode from wire format.
rbuf := bytes.NewReader(buf.Bytes())
msg, _, err := wire.ReadMessage(rbuf, test.pver, test.btcnet)
if err != nil {
t.Errorf("ReadMessage #%d error %v, msg %v", i, err,
spew.Sdump(msg))
continue
}
if !reflect.DeepEqual(msg, test.out) {
t.Errorf("ReadMessage #%d\n got: %v want: %v", i,
spew.Sdump(msg), spew.Sdump(test.out))
continue
}
}
}
// crawlIP retrievs a slice of ip addresses from a client
func crawlIP(s *dnsseeder, r *result) ([]*wire.NetAddress, *crawlError) {
conn, err := net.DialTimeout("tcp", r.node, time.Second*10)
if err != nil {
if config.debug {
log.Printf("%s - debug - Could not connect to %s - %v\n", s.name, r.node, err)
}
return nil, &crawlError{"", err}
}
defer conn.Close()
if config.debug {
log.Printf("%s - debug - Connected to remote address: %s\n", s.name, r.node)
}
// set a deadline for all comms to be done by. After this all i/o will error
conn.SetDeadline(time.Now().Add(time.Second * maxTo))
// First command to remote end needs to be a version command
// last parameter is lastblock
msgver, err := wire.NewMsgVersionFromConn(conn, nounce, 0)
if err != nil {
return nil, &crawlError{"Create NewMsgVersionFromConn", err}
}
err = wire.WriteMessage(conn, msgver, s.pver, s.id)
if err != nil {
// Log and handle the error
return nil, &crawlError{"Write Version Message", err}
}
// first message received should be version
msg, _, err := wire.ReadMessage(conn, s.pver, s.id)
if err != nil {
// Log and handle the error
return nil, &crawlError{"Read message after sending Version", err}
}
switch msg := msg.(type) {
case *wire.MsgVersion:
// The message is a pointer to a MsgVersion struct.
if config.debug {
log.Printf("%s - debug - %s - Remote version: %v\n", s.name, r.node, msg.ProtocolVersion)
}
// fill the node struct with the remote details
r.version = msg.ProtocolVersion
r.services = msg.Services
r.lastBlock = msg.LastBlock
r.strVersion = msg.UserAgent
default:
return nil, &crawlError{"Did not receive expected Version message from remote client", errors.New("")}
}
// send verack command
msgverack := wire.NewMsgVerAck()
err = wire.WriteMessage(conn, msgverack, s.pver, s.id)
if err != nil {
return nil, &crawlError{"writing message VerAck", err}
}
// second message received should be verack
msg, _, err = wire.ReadMessage(conn, s.pver, s.id)
if err != nil {
return nil, &crawlError{"reading expected Ver Ack from remote client", err}
}
switch msg.(type) {
case *wire.MsgVerAck:
if config.debug {
log.Printf("%s - debug - %s - received Version Ack\n", s.name, r.node)
}
default:
return nil, &crawlError{"Did not receive expected Ver Ack message from remote client", errors.New("")}
}
// if we get this far and if the seeder is full then don't ask for addresses. This will reduce bandwith usage while still
// confirming that we can connect to the remote node
if len(s.theList) > s.maxSize {
return nil, nil
}
// send getaddr command
msgGetAddr := wire.NewMsgGetAddr()
err = wire.WriteMessage(conn, msgGetAddr, s.pver, s.id)
if err != nil {
return nil, &crawlError{"writing Addr message to remote client", err}
}
c := 0
dowhile := true
for dowhile == true {
// Using the Bitcoin lib for the some networks means it does not understand some
// of the commands and will error. We can ignore these as we are only
// interested in the addr message and its content.
msgaddr, _, _ := wire.ReadMessage(conn, s.pver, s.id)
if msgaddr != nil {
switch msg := msgaddr.(type) {
case *wire.MsgAddr:
// received the addr message so return the result
if config.debug {
log.Printf("%s - debug - %s - received valid addr message\n", s.name, r.node)
}
dowhile = false
return msg.AddrList, nil
default:
if config.debug {
log.Printf("%s - debug - %s - ignoring message - %v\n", s.name, r.node, msg.Command())
}
}
}
// if we get more than 25 messages before the addr we asked for then give up on this client
if c++; c >= 25 {
dowhile = false
}
}
// received too many messages before requested Addr
return nil, &crawlError{"message loop - did not receive remote addresses in first 25 messages from remote client", errors.New("")}
}
