// Listen for any host trying to contact him.
// Will launch in a goroutine the srv function once a connection is established
func (t *TcpHost) Listen(addr string, fn func(Conn)) {
global, _ := cliutils.GlobalBind(addr)
ln, err := net.Listen("tcp", global)
if err != nil {
dbg.Fatal("error listening (host", t.Name(), ")")
}
dbg.Lvl3(t.Name(), "Waiting for connections on addr", addr, "..\n")
for {
conn, err := ln.Accept()
if err != nil {
dbg.Lvl2(t.Name(), "error accepting connection:", err)
continue
}
c := TcpConn{
Peer: conn.RemoteAddr().String(),
Conn: conn,
enc: gob.NewEncoder(conn),
dec: gob.NewDecoder(conn),
host: t,
}
t.peers[conn.RemoteAddr().String()] = &c
go fn(&c)
}
}
// Listen listens for incoming TCP connections.
// It is a non-blocking call that runs in the background.
// It accepts incoming connections and establishes Peers.
// When a peer attempts to connect it must send over its name (as a StringMarshaler),
// as well as its public key.
// Only after that point can be communicated with.
func (h *TCPHost) Listen() error {
var err error
dbg.Lvl3("Starting to listen on", h.name)
address, err := cliutils.GlobalBind(h.name)
if err != nil {
dbg.Fatal("Didn't get global binding for", address, err)
}
ln, err := net.Listen("tcp4", address)
if err != nil {
dbg.Lvl2("failed to listen on", address, ":", err)
return err
}
h.listener = ln
go func() {
for {
var err error
dbg.Lvl3(h.Name(), "Accepting incoming")
conn, err := ln.Accept()
dbg.Lvl3(h.Name(), "Connection request - handling")
if err != nil {
dbg.Lvl3("failed to accept connection:", err)
// if the host has been closed then stop listening
if atomic.LoadInt64(&h.closed) == 1 {
return
}
continue
}
// Read in name of client
tp := NewTCPConnFromNet(conn)
var mname StringMarshaler
err = tp.GetData(&mname)
if err != nil {
log.Errorln("failed to establish connection: getting name:", err)
tp.Close()
continue
}
name := string(mname)
// create connection
tp.SetName(name)
// get and set public key
suite := h.suite
pubkey := suite.Point()
err = tp.GetData(pubkey)
if err != nil {
log.Errorln("failed to establish connection: getting pubkey:", err)
tp.Close()
continue
}
tp.SetPubKey(pubkey)
// give child the public key
err = tp.PutData(h.Pubkey)
if err != nil {
log.Errorln("failed to send public key:", err)
continue
}
// the connection is now Ready to use
h.PeerLock.Lock()
h.Ready[name] = true
h.peers[name] = tp
dbg.Lvl3("Connected to child:", tp.Name())
h.PeerLock.Unlock()
go func() {
for {
data := h.pool.Get().(BinaryUnmarshaler)
err := tp.GetData(data)
h.msgchan <- NetworkMessg{Data: data, From: tp.Name(), Err: err}
}
}()
}
}()
return nil
}
// listen for clients connections
func (s *StampListener) ListenRequests() error {
dbg.Lvl3("Setup StampListener on", s.NameL)
global, _ := cliutils.GlobalBind(s.NameL)
var err error
s.Port, err = net.Listen("tcp4", global)
if err != nil {
panic(err)
}
go func() {
for {
dbg.Lvlf2("Listening to sign-requests: %p", s)
conn, err := s.Port.Accept()
if err != nil {
// handle error
dbg.Lvl3("failed to accept connection")
select {
case w := <-s.waitClose:
dbg.Lvl3("Closing stamplistener:", w)
return
default:
continue
}
}
dbg.Lvl3("Waiting for connection")
c := coconet.NewTCPConnFromNet(conn)
if _, ok := s.Clients[c.Name()]; !ok {
s.Clients[c.Name()] = c
go func(co coconet.Conn) {
for {
tsm := TimeStampMessage{}
err := co.GetData(&tsm)
dbg.Lvlf2("Got data to sign %+v - %+v", tsm, tsm.Sreq)
if err != nil {
dbg.Lvlf1("%p Failed to get from child: %s", s.NameL, err)
co.Close()
return
}
switch tsm.Type {
default:
dbg.Lvlf1("Message of unknown type: %v\n", tsm.Type)
case StampRequestType:
s.Mux.Lock()
s.Queue[READING] = append(s.Queue[READING],
MustReplyMessage{Tsm: tsm, To: co.Name()})
s.Mux.Unlock()
case StampClose:
dbg.Lvl2("Closing connection")
co.Close()
return
case StampExit:
dbg.Lvl2("Exiting server upon request")
os.Exit(-1)
}
}
}(c)
}
}
}()
return nil
}
// Main entry point of the validation mode
func Validation(keyFile string) {
// First, retrieve our public / private key pair + address for which it has
// been created
kp, addr := readKeyFile(keyFile)
// Then wait for the connection
// Accept incoming connections
global, _ := cliutils.GlobalBind(addr)
ln, err := net.Listen("tcp", global)
if err != nil {
dbg.Fatal("Could not listen for validation:", err)
}
var conn net.Conn
for ; ; conn.Close() {
dbg.Lvl1("Waiting for verifier connection ...")
// Accept the one
conn, err = ln.Accept()
if err != nil {
dbg.Fatal("Could not accept an input connection:", err)
}
dbg.Lvl1("Verifier connected! Validation in progress...")
// Craft the message about our system,signs it, and then send the whole
msg := createSystemPacket()
signature := signSystemPacket(msg, kp)
// We also send the size of the signature for the receiver to know how much
// byte he is expecting
if err := suite.Write(conn, msg, len(signature), signature); err != nil {
dbg.Lvl1("Error when writing the system packet to the connection:", err)
continue
}
// Receive the response
var ack Ack
if err := suite.Read(conn, &ack); err != nil {
dbg.Lvl1("Error when reading the response:", err)
}
var er string = "Validation is NOT correct, something is wrong about your "
// All went fine
dbg.Lvl2("Received code", ack)
switch ack.Code {
default:
dbg.Lvl1("Validation received unknown ACK: type =", ack.Type, "Code =", ack.Code)
continue
case SYS_OK:
dbg.Lvl1("Validation finished successfully! You should receive an email from development team soon.")
case SYS_WRONG_HOST:
dbg.Lvl1(er + "HOSTNAME")
case SYS_WRONG_SOFT:
dbg.Lvl1(er + "SOFT limits")
case SYS_WRONG_SIG:
dbg.Lvl1(er + "signature!")
case SYS_EXIT:
dbg.Lvl1("Exiting - need to update to get config.toml")
os.Exit(1)
}
}
}
