Exemplo n.º 1
0
// Add Purge Token to database, and remove corresponding message if necessary.
func AddPurge(log chan string, p objects.Purge) error {
	mutex.Lock()
	defer mutex.Unlock()

	txid := p.GetBytes()
	hashArr := sha512.Sum384(txid)
	hash := hashArr[:]

	if hashList == nil || dbConn == nil {
		return DBError(EUNINIT)
	}
	hashObj := new(objects.Hash)
	hashObj.FromBytes(hash)

	if Contains(*hashObj) == PURGE {
		return nil
	}

	err := dbConn.Exec("INSERT INTO purge VALUES (?, ?)", hash, txid)
	if err != nil {
		log <- fmt.Sprintf("Error inserting purge into db... %s", err)
		return err
	}

	Add(*hashObj, PURGE)
	return nil
}
Exemplo n.º 2
0
func (service *EMPService) PurgeMessage(r *http.Request, args *[]byte, reply *NilParam) error {
	if len(*args) != 16 {
		return errors.New("Invalid Txid: Bad Length")
	}

	txidHash := objects.MakeHash(*args)

	if localdb.Contains(txidHash) <= localdb.SENDBOX {
		msg, err := localdb.GetMessageDetail(txidHash)
		if err != nil {
			return errors.New(fmt.Sprintf("Problem Retrieving Message: %s", err))
		}
		msg.MetaMessage.Purged = true
		localdb.AddUpdateMessage(msg, -1)

		// Send Purge Request
		purge := new(objects.Purge)
		purge.Txid = msg.Decrypted.Txid

		service.Config.RecvQueue <- *objects.MakeFrame(objects.PURGE, objects.BROADCAST, purge)

		return nil
	}

	return errors.New("Txid Not Found")
}
Exemplo n.º 3
0
// Get purge token from the database.
func GetPurge(log chan string, txidHash objects.Hash) *objects.Purge {
	mutex.Lock()
	defer mutex.Unlock()

	hash := txidHash.GetBytes()

	if hashList == nil || dbConn == nil {
		return nil
	}
	if hashList[string(hash)] != PURGE {
		return nil
	}

	for s, err := dbConn.Query("SELECT txid FROM purge WHERE hash=?", hash); err == nil; err = s.Next() {
		var txid []byte
		s.Scan(&txid) // Assigns 1st column to rowid, the rest to row
		p := new(objects.Purge)
		p.FromBytes(txid)
		return p
	}
	// Not Found
	return nil
}
Exemplo n.º 4
0
Arquivo: api.go Projeto: dcposch/emp
// Starts a new TCP Server wth configuration specified in ApiConfig.
// Server will terminate cleanly only when data is sent to the Quit channel.
//
// See (struct ApiConfig) for details.
func Start(config *ApiConfig) {
	var err error
	var frame quibit.Frame

	defer quit(config)

	config.Log <- "Starting api..."

	// Start Database Services
	err = db.Initialize(config.Log, config.DbFile)
	defer db.Cleanup()
	if err != nil {
		config.Log <- fmt.Sprintf("Error initializing database: %s", err)
		config.Log <- "Quit"
		return
	}
	config.LocalVersion.Timestamp = time.Now().Round(time.Second)

	locVersion := objects.MakeFrame(objects.VERSION, objects.REQUEST, &config.LocalVersion)
	for str, _ := range config.NodeList.Nodes {
		locVersion.Peer = str
		config.SendQueue <- *locVersion
	}

	// Set Up Clocks
	second := time.Tick(2 * time.Second)
	minute := time.Tick(time.Minute)

	for {
		select {
		case frame = <-config.RecvQueue:
			config.Log <- fmt.Sprintf("Received %s frame...", CmdString(frame.Header.Command))
			switch frame.Header.Command {
			case objects.VERSION:
				version := new(objects.Version)
				err = version.FromBytes(frame.Payload)
				if err != nil {
					config.Log <- fmt.Sprintf("Error parsing version: %s", err)
				} else {
					fVERSION(config, frame, version)
				}
			case objects.PEER:
				nodeList := new(objects.NodeList)
				err = nodeList.FromBytes(frame.Payload)
				if err != nil {
					config.Log <- fmt.Sprintf("Error parsing peer list: %s", err)
				} else {
					fPEER(config, frame, nodeList)
				}
			case objects.OBJ:
				obj := new(objects.Obj)
				err = obj.FromBytes(frame.Payload)
				if err != nil {
					config.Log <- fmt.Sprintf("Error parsing obj list: %s", err)
				} else {
					fOBJ(config, frame, obj)
				}
			case objects.GETOBJ:
				getObj := new(objects.Hash)
				if len(frame.Payload) == 0 {
					break
				}
				err = getObj.FromBytes(frame.Payload)
				if err != nil {
					config.Log <- fmt.Sprintf("Error parsing getobj hash: %s", err)
				} else {
					fGETOBJ(config, frame, getObj)
				}
			case objects.PUBKEY_REQUEST:
				pubReq := new(objects.Hash)
				err = pubReq.FromBytes(frame.Payload)
				if err != nil {
					config.Log <- fmt.Sprintf("Error parsing pubkey request hash: %s", err)
				} else {
					fPUBKEY_REQUEST(config, frame, pubReq)
				}
			case objects.PUBKEY:
				pub := new(objects.EncryptedPubkey)
				err = pub.FromBytes(frame.Payload)
				if err != nil {
					config.Log <- fmt.Sprintf("Error parsing pubkey: %s", err)
				} else {
					fPUBKEY(config, frame, pub)
				}
			case objects.MSG:
				msg := new(objects.Message)
				err = msg.FromBytes(frame.Payload)
				if err != nil {
					config.Log <- fmt.Sprintf("Error parsing message: %s", err)
				} else {
					fMSG(config, frame, msg)
				}
			case objects.PUB:
				msg := new(objects.Message)
				err = msg.FromBytes(frame.Payload)
				if err != nil {
					config.Log <- fmt.Sprintf("Error parsing publication: %s", err)
				} else {
					fPUB(config, frame, msg)
				}
			case objects.PURGE:
				purge := new(objects.Purge)
				err = purge.FromBytes(frame.Payload)
				if err != nil {
					config.Log <- fmt.Sprintf("Error parsing purge: %s", err)
				} else {
					fPURGE(config, frame, purge)
				}
			case objects.CHECKTXID:
				chkTxid := new(objects.Hash)
				if len(frame.Payload) == 0 {
					break
				}
				err = chkTxid.FromBytes(frame.Payload)
				if err != nil {
					config.Log <- fmt.Sprintf("Error parsing checktxid hash: %s", err)
				} else {
					fCHECKTXID(config, frame, chkTxid)
				}
			default:
				config.Log <- fmt.Sprintf("Received invalid frame for command: %d", frame.Header.Command)
			}
		case <-config.Quit:
			fmt.Println()
			// Dump Nodes to File
			DumpNodes(config)
			return
		case <-second:
			// Reconnection Logic
			for key, node := range config.NodeList.Nodes {
				peer := quibit.GetPeer(key)
				if peer == nil || !peer.IsConnected() {
					quibit.KillPeer(key)
					if node.Attempts >= 3 {
						config.Log <- fmt.Sprintf("Max connection attempts reached for %s, disconnecting...", key)
						// Max Attempts Reached, disconnect
						delete(config.NodeList.Nodes, key)
					} else {
						config.Log <- fmt.Sprintf("Disconnected from peer %s, trying to reconnect...", key)
						peer = new(quibit.Peer)
						peer.IP = node.IP
						peer.Port = node.Port
						config.PeerQueue <- *peer
						runtime.Gosched()
						peer = nil
						node.Attempts++
						config.NodeList.Nodes[key] = node
						locVersion.Peer = key
						config.SendQueue <- *locVersion
					}
				}
			}

			if len(config.NodeList.Nodes) < 1 {
				config.Log <- "All connections lost, re-bootstrapping..."

				for i, str := range config.Bootstrap {
					if i >= bufLen {
						break
					}

					p := new(quibit.Peer)
					n := new(objects.Node)
					err := n.FromString(str)
					if err != nil {
						fmt.Println("Error Decoding Peer ", str, ": ", err)
						continue
					}

					p.IP = n.IP
					p.Port = n.Port
					config.PeerQueue <- *p
					runtime.Gosched()
					config.NodeList.Nodes[n.String()] = *n
				}

				for str, _ := range config.NodeList.Nodes {
					locVersion.Peer = str
					config.SendQueue <- *locVersion
				}
			}
		case <-minute:
			// Dump old messages
			err = db.SweepMessages(30 * 24 * time.Hour)
			if err != nil {
				config.Log <- fmt.Sprintf("Error Sweeping Messages: %s", err)
			}
		}
	}

	// Should NEVER get here!
	panic("Must've been a cosmic ray!")
}
Exemplo n.º 5
0
func (service *EMPService) OpenMessage(r *http.Request, args *[]byte, reply *objects.FullMessage) error {
	if !basicAuth(service.Config, r) {
		service.Config.Log <- fmt.Sprintf("Unauthorized RPC Request from: %s", r.RemoteAddr)
		return errors.New("Unauthorized")
	}

	var txidHash objects.Hash
	txidHash.FromBytes(*args)

	// Get Message from Database
	msg, err := localdb.GetMessageDetail(txidHash)
	if err != nil {
		return err
	}

	if msg.Encrypted == nil {
		*reply = *msg
		return nil
	}

	// If not decrypted, decrypt message and purge
	if msg.Decrypted == nil {
		recipient, err := localdb.GetAddressDetail(objects.MakeHash(encryption.StringToAddress(msg.MetaMessage.Recipient)))
		if err != nil {
			return err
		}

		if recipient.Privkey == nil {
			*reply = *msg
			return nil
		}

		// Decrypt Message
		decrypted := encryption.Decrypt(service.Config.Log, recipient.Privkey, msg.Encrypted)
		if len(decrypted) == 0 {
			*reply = *msg
			return nil
		}
		msg.Decrypted = new(objects.DecryptedMessage)
		msg.Decrypted.FromBytes(decrypted)

		// Update Sender

		x, y := encryption.UnmarshalPubkey(msg.Decrypted.Pubkey[:])
		address := encryption.GetAddress(service.Config.Log, x, y)
		addrStr := encryption.AddressToString(address)
		addrHash := objects.MakeHash(address)

		detail, _ := localdb.GetAddressDetail(addrHash)
		if detail == nil {
			detail = new(objects.AddressDetail)
		}
		detail.Address = address
		detail.String = addrStr
		detail.Pubkey = msg.Decrypted.Pubkey[:]

		localdb.AddUpdateAddress(detail)
		msg.MetaMessage.Sender = detail.String

		// Send Purge Request
		purge := new(objects.Purge)
		purge.Txid = msg.Decrypted.Txid

		service.Config.RecvQueue <- *objects.MakeFrame(objects.PURGE, objects.BROADCAST, purge)
		msg.MetaMessage.Purged = true

		localdb.AddUpdateMessage(msg, localdb.Contains(msg.MetaMessage.TxidHash))
	} else {
		if msg.MetaMessage.Purged == false && localdb.Contains(txidHash) == localdb.INBOX {
			msg.MetaMessage.Purged = true
			localdb.AddUpdateMessage(msg, localdb.Contains(msg.MetaMessage.TxidHash))
		}
	}

	*reply = *msg
	return nil
}