Unbewohnte
/
ftu
1
1
Fork 0
Code Issues Pull Requests Projects Releases 21 Wiki Activity
Browse Source

[node] unexported unnecessary struct fields, divided transferInfo into sending and receiving parts; implemented yet untested sendDirectoryPacket

main
Unbewohnte 3 years ago
parent
442af0205e
commit
205fbcc2d3
2 changed files with 198 additions and 110 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Split View
Diff Options
Show Stats Download Patch File Download Diff File
  1. 220
      src/node/node.go
  2. 32
      src/node/transfer.go

220
src/node/node.go
Unescape View File

@ -19,99 +19,132 @@ import (
)
// node-controlling states
type NodeInnerStates struct {
type nodeInnerstates struct {
Stopped bool // the way to exit the mainloop in case of an external error or a successful end of a transfer
AllowedToTransfer bool // the way to notify the mainloop of a sending node to start sending pieces of files
}
// Network specific settings
type Net struct {
// netInfowork specific settings
type netInfoInfo struct {
ConnAddr string // address to connect to. Does not include port
Conn net.Conn // the core TCP connection of the node. Self-explanatory
Port uint // a port to connect to/listen on
EncryptionKey []byte // if != nil - incoming packets will be decrypted with it and outcoming packets will be encrypted
}
// Both sending-side and receiving-side information
type TransferInfo struct {
Ready bool // is the other node ready to receive another piece
// Sending-side node information
type sending struct {
ServingPath string // path to the thing that will be sent
IsDirectory bool // is ServingPath a directory
Recursive bool // recursively send directory
CanSendBytes bool // is the other node ready to receive another piece
}
// Receiving-side node information
type receiving struct {
AcceptedFiles []*fsys.File // files that`ve been accepted to be received
DownloadsPath string // where to download
}
// Both sending-side and receiving-side information
type transferInfo struct {
Receiving *receiving
Sending *sending
}
// Sender and receiver in one type !
type Node struct {
PacketPipe chan *protocol.Packet // a way to receive incoming packets from another goroutine
IsSending bool // sending or a receiving node
Net *Net
State *NodeInnerStates
TransferInfo *TransferInfo
packetPipe chan *protocol.Packet // a way to receive incoming packets from another goroutine
isSending bool // sending or a receiving node
netInfo *netInfoInfo
state *nodeInnerstates
transferInfo *transferInfo
}
// Creates a new either a sending or receiving node with specified options
func NewNode(options *NodeOptions) (*Node, error) {
var isDir bool
if options.IsSending {
sendingPathStats, err := os.Stat(options.ServerSide.ServingPath)
if err != nil {
return nil, err
}
switch sendingPathStats.IsDir() {
case true:
isDir = true
case false:
isDir = false
}
}
node := Node{
PacketPipe: make(chan *protocol.Packet, 100),
IsSending: options.IsSending,
Net: &Net{
packetPipe: make(chan *protocol.Packet, 100),
isSending: options.IsSending,
netInfo: &netInfoInfo{
Port: options.WorkingPort,
ConnAddr: options.ClientSide.ConnectionAddr,
EncryptionKey: nil,
Conn: nil,
},
State: &NodeInnerStates{
state: &nodeInnerstates{
AllowedToTransfer: false,
Stopped: false,
},
TransferInfo: &TransferInfo{
transferInfo: &transferInfo{
Sending: &sending{
ServingPath: options.ServerSide.ServingPath,
Recursive: options.ServerSide.Recursive,
IsDirectory: isDir,
},
Receiving: &receiving{
AcceptedFiles: nil,
DownloadsPath: options.ClientSide.DownloadsFolderPath,
},
},
}
return &node, nil
}
// Connect node to another listening one with a pre-defined address&&port
func (node *Node) connect() error {
if node.Net.Port == 0 {
node.Net.Port = 7270
if node.netInfo.Port == 0 {
node.netInfo.Port = 7270
}
fmt.Printf("Connecting to %s:%d...\n", node.Net.ConnAddr, node.Net.Port)
fmt.Printf("Connecting to %s:%d...\n", node.netInfo.ConnAddr, node.netInfo.Port)
conn, err := net.DialTimeout("tcp", fmt.Sprintf("%s:%d", node.Net.ConnAddr, node.Net.Port), time.Second*5)
conn, err := net.DialTimeout("tcp", fmt.Sprintf("%s:%d", node.netInfo.ConnAddr, node.netInfo.Port), time.Second*5)
if err != nil {
return err
}
fmt.Printf("Connected\n")
node.Net.Conn = conn
node.netInfo.Conn = conn
return nil
}
// Notify the other node and close the connection
func (node *Node) disconnect() error {
if node.Net.Conn != nil {
if node.netInfo.Conn != nil {
// notify the other node and close the connection
err := protocol.SendPacket(node.Net.Conn, protocol.Packet{
err := protocol.SendPacket(node.netInfo.Conn, protocol.Packet{
Header: protocol.HeaderDisconnecting,
})
if err != nil {
return err
}
err = node.Net.Conn.Close()
err = node.netInfo.Conn.Close()
if err != nil {
return err
}
node.State.Stopped = true
node.state.Stopped = true
}
return nil
@ -119,7 +152,7 @@ func (node *Node) disconnect() error {
// Wait for a connection on a pre-defined port
func (node *Node) waitForConnection() error {
listener, err := net.Listen("tcp", fmt.Sprintf(":%d", node.Net.Port))
listener, err := net.Listen("tcp", fmt.Sprintf(":%d", node.netInfo.Port))
if err != nil {
return err
}
@ -132,14 +165,14 @@ func (node *Node) waitForConnection() error {
fmt.Printf("New connection from %s\n", connection.RemoteAddr().String())
node.Net.Conn = connection
node.netInfo.Conn = connection
return nil
}
// Starts the node in either sending or receiving state and performs the transfer
func (node *Node) Start() {
switch node.IsSending {
switch node.isSending {
case true:
// SENDER
@ -149,11 +182,22 @@ func (node *Node) Start() {
panic(err)
}
file, err := fsys.GetFile(node.TransferInfo.ServingPath)
var file *fsys.File
var dir *fsys.Directory
switch node.transferInfo.Sending.IsDirectory {
case true:
dir, err = fsys.GetDir(node.transferInfo.Sending.ServingPath, node.transferInfo.Sending.Recursive)
if err != nil {
panic(err)
}
case false:
file, err = fsys.GetFile(node.transferInfo.Sending.ServingPath)
if err != nil {
panic(err)
}
fmt.Printf("Sending \"%s\" (%.2f MB) locally on %s:%d\n", file.Name, float32(file.Size)/1024/1024, localIP, node.Net.Port)
}
fmt.Printf("Sending \"%s\" (%.2f MB) locally on %s:%d\n", file.Name, float32(file.Size)/1024/1024, localIP, node.netInfo.Port)
// wain for another node to connect
err = node.waitForConnection()
@ -163,35 +207,39 @@ func (node *Node) Start() {
// generate and send encryption key
encrKey := encryption.Generate32AESkey()
node.Net.EncryptionKey = encrKey
node.netInfo.EncryptionKey = encrKey
fmt.Printf("Generated encryption key: %s\n", encrKey)
err = sendEncryptionKey(node.Net.Conn, encrKey)
err = sendEncryptionKey(node.netInfo.Conn, encrKey)
if err != nil {
panic(err)
}
// listen for incoming packets
go receivePackets(node.Net.Conn, node.PacketPipe)
go receivePackets(node.netInfo.Conn, node.packetPipe)
// send info on file/directory
go sendFilePacket(node.Net.Conn, file, node.Net.EncryptionKey)
if dir != nil {
go sendDirectoryPacket(node.netInfo.Conn, dir, node.netInfo.EncryptionKey)
} else {
go sendFilePacket(node.netInfo.Conn, file, node.netInfo.EncryptionKey)
}
// mainloop
for {
if node.State.Stopped {
if node.state.Stopped {
node.disconnect()
break
}
// receive incoming packets and decrypt them if necessary
incomingPacket, ok := <-node.PacketPipe
incomingPacket, ok := <-node.packetPipe
if !ok {
node.State.Stopped = true
node.state.Stopped = true
}
if node.Net.EncryptionKey != nil {
err = incomingPacket.DecryptBody(node.Net.EncryptionKey)
if node.netInfo.EncryptionKey != nil {
err = incomingPacket.DecryptBody(node.netInfo.EncryptionKey)
if err != nil {
panic(err)
}
@ -201,28 +249,40 @@ func (node *Node) Start() {
switch incomingPacket.Header {
case protocol.HeaderReady:
// the other node is ready to receive file data
node.TransferInfo.Ready = true
node.transferInfo.Sending.CanSendBytes = true
case protocol.HeaderAccept:
node.State.AllowedToTransfer = true
node.state.AllowedToTransfer = true
fmt.Printf("Transfer allowed. Sending...\n")
case protocol.HeaderReject:
node.State.Stopped = true
node.state.Stopped = true
fmt.Printf("Transfer rejected. Disconnecting...")
case protocol.HeaderDisconnecting:
node.State.Stopped = true
node.state.Stopped = true
fmt.Printf("%s disconnected\n", node.Net.Conn.RemoteAddr())
fmt.Printf("%s disconnected\n", node.netInfo.Conn.RemoteAddr())
}
// if allowed to transfer and the other node is ready to receive packets - send one piece
// and wait for it to be ready again
if node.State.AllowedToTransfer && node.TransferInfo.Ready {
err = sendPiece(file, node.Net.Conn, node.Net.EncryptionKey)
if node.state.AllowedToTransfer && node.transferInfo.Sending.CanSendBytes {
// handle a single file or a directory
switch node.transferInfo.Sending.IsDirectory {
case true:
// sending a file in a directory (possibly more than 1)
if !node.transferInfo.Sending.Recursive {
} else {
}
case false:
// sending a single file
err = sendPiece(file, node.netInfo.Conn, node.netInfo.EncryptionKey)
switch err {
case ErrorSentAll:
// the file has been sent fully
@ -237,33 +297,35 @@ func (node *Node) Start() {
Body: fileIDBuff.Bytes(),
}
if node.Net.EncryptionKey != nil {
err = endFilePacket.EncryptBody(node.Net.EncryptionKey)
if node.netInfo.EncryptionKey != nil {
err = endFilePacket.EncryptBody(node.netInfo.EncryptionKey)
if err != nil {
panic(err)
}
}
protocol.SendPacket(node.Net.Conn, endFilePacket)
protocol.SendPacket(node.netInfo.Conn, endFilePacket)
// because there`s still no handling for directories - send
// done packet
protocol.SendPacket(node.Net.Conn, protocol.Packet{
protocol.SendPacket(node.netInfo.Conn, protocol.Packet{
Header: protocol.HeaderDone,
})
node.State.Stopped = true
node.state.Stopped = true
case nil:
default:
node.State.Stopped = true
node.state.Stopped = true
fmt.Printf("An error occured while sending a piece of \"%s\": %s\n", file.Name, err)
panic(err)
}
node.TransferInfo.Ready = false
node.transferInfo.Sending.CanSendBytes = false
}
}
}
@ -273,27 +335,27 @@ func (node *Node) Start() {
// connect to the sending node
err := node.connect()
if err != nil {
fmt.Printf("Could not connect to %s:%d\n", node.Net.ConnAddr, node.Net.Port)
fmt.Printf("Could not connect to %s:%d\n", node.netInfo.ConnAddr, node.netInfo.Port)
os.Exit(-1)
}
// listen for incoming packets
go receivePackets(node.Net.Conn, node.PacketPipe)
go receivePackets(node.netInfo.Conn, node.packetPipe)
// mainloop
for {
if node.State.Stopped {
if node.state.Stopped {
node.disconnect()
break
}
// receive incoming packets and decrypt them if necessary
incomingPacket, ok := <-node.PacketPipe
incomingPacket, ok := <-node.packetPipe
if !ok {
break
}
if node.Net.EncryptionKey != nil {
err = incomingPacket.DecryptBody(node.Net.EncryptionKey)
if node.netInfo.EncryptionKey != nil {
err = incomingPacket.DecryptBody(node.netInfo.EncryptionKey)
if err != nil {
panic(err)
}
@ -322,12 +384,12 @@ func (node *Node) Start() {
if strings.EqualFold(answer, "y") || answer == "" {
// yes
err = os.MkdirAll(node.TransferInfo.DownloadsPath, os.ModePerm)
err = os.MkdirAll(node.transferInfo.Receiving.DownloadsPath, os.ModePerm)
if err != nil {
panic(err)
}
fullFilePath := filepath.Join(node.TransferInfo.DownloadsPath, file.Name)
fullFilePath := filepath.Join(node.transferInfo.Receiving.DownloadsPath, file.Name)
// check if the file already exists; if yes - remove it and replace with a new one
_, err := os.Stat(fullFilePath)
@ -340,28 +402,28 @@ func (node *Node) Start() {
file.Path = fullFilePath
file.Open()
node.TransferInfo.AcceptedFiles = append(node.TransferInfo.AcceptedFiles, file)
node.transferInfo.Receiving.AcceptedFiles = append(node.transferInfo.Receiving.AcceptedFiles, file)
// send aceptance packet
acceptancePacket := protocol.Packet{
Header: protocol.HeaderAccept,
Body: responsePacketFileIDBuffer.Bytes(),
}
if node.Net.EncryptionKey != nil {
err = acceptancePacket.EncryptBody(node.Net.EncryptionKey)
if node.netInfo.EncryptionKey != nil {
err = acceptancePacket.EncryptBody(node.netInfo.EncryptionKey)
if err != nil {
panic(err)
}
}
err = protocol.SendPacket(node.Net.Conn, acceptancePacket)
err = protocol.SendPacket(node.netInfo.Conn, acceptancePacket)
if err != nil {
panic(err)
}
// notify the node that we`re ready to transportation. No need
// for encryption because the body is nil
err = protocol.SendPacket(node.Net.Conn, protocol.Packet{
err = protocol.SendPacket(node.netInfo.Conn, protocol.Packet{
Header: protocol.HeaderReady,
})
if err != nil {
@ -375,19 +437,19 @@ func (node *Node) Start() {
Body: responsePacketFileIDBuffer.Bytes(),
}
if node.Net.EncryptionKey != nil {
err = rejectionPacket.EncryptBody(node.Net.EncryptionKey)
if node.netInfo.EncryptionKey != nil {
err = rejectionPacket.EncryptBody(node.netInfo.EncryptionKey)
if err != nil {
panic(err)
}
}
err = protocol.SendPacket(node.Net.Conn, rejectionPacket)
err = protocol.SendPacket(node.netInfo.Conn, rejectionPacket)
if err != nil {
panic(err)
}
node.State.Stopped = true
node.state.Stopped = true
}
}()
@ -400,7 +462,7 @@ func (node *Node) Start() {
panic(err)
}
for _, acceptedFile := range node.TransferInfo.AcceptedFiles {
for _, acceptedFile := range node.transferInfo.Receiving.AcceptedFiles {
if acceptedFile.ID == fileID {
// accepted
@ -415,7 +477,7 @@ func (node *Node) Start() {
}
// notify the other one that this node is ready
err = protocol.SendPacket(node.Net.Conn, protocol.Packet{
err = protocol.SendPacket(node.netInfo.Conn, protocol.Packet{
Header: protocol.HeaderReady,
})
if err != nil {
@ -434,7 +496,7 @@ func (node *Node) Start() {
panic(err)
}
for index, acceptedFile := range node.TransferInfo.AcceptedFiles {
for index, acceptedFile := range node.transferInfo.Receiving.AcceptedFiles {
if acceptedFile.ID == fileID {
// accepted
@ -442,7 +504,7 @@ func (node *Node) Start() {
defer acceptedFile.Handler.Close()
// remove this file from the pool
node.TransferInfo.AcceptedFiles = append(node.TransferInfo.AcceptedFiles[:index], node.TransferInfo.AcceptedFiles[index+1:]...)
node.transferInfo.Receiving.AcceptedFiles = append(node.transferInfo.Receiving.AcceptedFiles[:index], node.transferInfo.Receiving.AcceptedFiles[index+1:]...)
// compare checksums
realChecksum, err := checksum.GetPartialCheckSum(acceptedFile.Handler)
@ -461,7 +523,7 @@ func (node *Node) Start() {
}
}
// node.State.Stopped = true
// node.state.Stopped = true
case protocol.HeaderEncryptionKey:
// retrieve the key
@ -473,15 +535,15 @@ func (node *Node) Start() {
encrKey := make([]byte, keySize)
packetReader.Read(encrKey)
node.Net.EncryptionKey = encrKey
node.netInfo.EncryptionKey = encrKey
case protocol.HeaderDone:
node.State.Stopped = true
node.state.Stopped = true
case protocol.HeaderDisconnecting:
node.State.Stopped = true
node.state.Stopped = true
fmt.Printf("%s disconnected\n", node.Net.Conn.RemoteAddr())
fmt.Printf("%s disconnected\n", node.netInfo.Conn.RemoteAddr())
}
}

32
src/node/transfer.go
Unescape View File

@ -24,7 +24,7 @@ func sendFilePacket(connection net.Conn, file *fsys.File, encrKey []byte) error
return err
}
// FILE~(idInBinary)(filenameLengthInBinary)(filename)(filesize)(checksumLengthInBinary)checksum
// FILE~(idInBinary)(filenameLengthInBinary)(filename)(filesize)(checksumLengthInBinary)(checksum)
// send file packet with file description
filePacket := protocol.Packet{
@ -69,14 +69,22 @@ func sendFilePacket(connection net.Conn, file *fsys.File, encrKey []byte) error
return err
}
// we do not check for packet size because there is no way that it`ll exceed current
// maximum of 128 KiB
return nil
}
// sends a notification about the directory
func sendDirectoryPacket(connection net.Conn, dir *fsys.Directory) error {
// sends a notification about the directory. If encrkey != nil - encrypts
// packet`s body
func sendDirectoryPacket(connection net.Conn, dir *fsys.Directory, encrKey []byte) error {
if connection == nil {
return ErrorNotConnected
}
dirPacket := protocol.Packet{
Header: protocol.HeaderDirectory,
}
// DIRECTORY~(dirname size in binary)(dirname)(dirsize)(checksumLengthInBinary)(checksum)
dirPacketBuffer := new(bytes.Buffer)
@ -103,6 +111,24 @@ func sendDirectoryPacket(connection net.Conn, dir *fsys.Directory) error {
}
dirPacketBuffer.Write([]byte(dir.Checksum))
dirPacket.Body = dirPacketBuffer.Bytes()
if encrKey != nil {
// if the key is given - encrypt ready-to-go packet
err = dirPacket.EncryptBody(encrKey)
if err != nil {
return err
}
}
// and send it
err = protocol.SendPacket(connection, dirPacket)
if err != nil {
return err
}
// we do not check for packet size because there is no way that it`ll exceed current
// maximum of 128 KiB
return nil
}

Write Preview
Loading…
Cancel
Save