package hotline
import (
+ "bytes"
"context"
"encoding/binary"
"errors"
"fmt"
+ "github.com/go-playground/validator/v10"
"go.uber.org/zap"
"io"
"io/fs"
trackerUpdateFrequency = 300 // time in seconds between tracker re-registration
)
+var nostalgiaVersion = []byte{0, 0, 2, 0x2c} // version ID used by the Nostalgia client
+
type Server struct {
Port int
Accounts map[string]*Account
Logger *zap.SugaredLogger
PrivateChats map[uint32]*PrivateChat
NextGuestID *uint16
- TrackerPassID []byte
+ TrackerPassID [4]byte
Stats *Stats
APIListener net.Listener
}
func (s *Server) ListenAndServe(ctx context.Context, cancelRoot context.CancelFunc) error {
- s.Logger.Infow("Hotline server started", "version", VERSION)
+ s.Logger.Infow("Hotline server started",
+ "version", VERSION,
+ "API port", fmt.Sprintf(":%v", s.Port),
+ "Transfer port", fmt.Sprintf(":%v", s.Port+1),
+ )
+
var wg sync.WaitGroup
wg.Add(1)
return nil
}
-func (s *Server) APIPort() int {
- return s.APIListener.Addr().(*net.TCPAddr).Port
-}
-
func (s *Server) ServeFileTransfers(ln net.Listener) error {
- s.Logger.Infow("Hotline file transfer server started", "Addr", fmt.Sprintf(":%v", s.Port+1))
-
for {
conn, err := ln.Accept()
if err != nil {
"IsReply", t.IsReply,
"type", handler.Name,
"sentBytes", n,
- "remoteAddr", client.Connection.RemoteAddr(),
+ "remoteAddr", client.RemoteAddr,
)
return nil
}
func (s *Server) Serve(ctx context.Context, cancelRoot context.CancelFunc, ln net.Listener) error {
- s.Logger.Infow("Hotline server started", "Addr", fmt.Sprintf(":%v", s.Port))
for {
conn, err := ln.Accept()
}
}()
go func() {
- if err := s.handleNewConnection(conn); err != nil {
+ if err := s.handleNewConnection(conn, conn.RemoteAddr().String()); err != nil {
if err == io.EOF {
s.Logger.Infow("Client disconnected", "RemoteAddr", conn.RemoteAddr())
} else {
outbox: make(chan Transaction),
Stats: &Stats{StartTime: time.Now()},
ThreadedNews: &ThreadedNews{},
- TrackerPassID: make([]byte, 4),
}
ln, err := net.Listen("tcp", fmt.Sprintf("%s:%v", netInterface, netPort))
}
server.APIListener = ln
- if netPort != 0 {
- netPort += 1
- }
-
- ln2, err := net.Listen("tcp", fmt.Sprintf("%s:%v", netInterface, netPort))
+ ln2, err := net.Listen("tcp", fmt.Sprintf("%s:%v", netInterface, netPort+1))
server.FileListener = ln2
if err != nil {
return nil, err
}
// generate a new random passID for tracker registration
- if _, err := rand.Read(server.TrackerPassID); err != nil {
+ if _, err := rand.Read(server.TrackerPassID[:]); err != nil {
return nil, err
}
- server.Logger.Debugw("Loading Agreement", "path", configDir+agreementFile)
if server.Agreement, err = os.ReadFile(configDir + agreementFile); err != nil {
return nil, err
}
go func() {
for {
tr := &TrackerRegistration{
- Port: []byte{0x15, 0x7c},
UserCount: server.userCount(),
- PassID: server.TrackerPassID,
+ PassID: server.TrackerPassID[:],
Name: server.Config.Name,
Description: server.Config.Description,
}
+ binary.BigEndian.PutUint16(tr.Port[:], uint16(server.Port))
for _, t := range server.Config.Trackers {
if err := register(t, tr); err != nil {
server.Logger.Errorw("unable to register with tracker %v", "error", err)
return err
}
-func (s *Server) NewClientConn(conn net.Conn) *ClientConn {
+func (s *Server) NewClientConn(conn net.Conn, remoteAddr string) *ClientConn {
s.mux.Lock()
defer s.mux.Unlock()
AutoReply: []byte{},
Transfers: make(map[int][]*FileTransfer),
Agreed: false,
+ RemoteAddr: remoteAddr,
}
*s.NextGuestID++
ID := *s.NextGuestID
s.mux.Lock()
defer s.mux.Unlock()
- fmt.Printf("login: %v, newLogin: %v: ", login, newLogin)
-
// update renames the user login
if login != newLogin {
err := os.Rename(s.ConfigDir+"Users/"+login+".yaml", s.ConfigDir+"Users/"+newLogin+".yaml")
if err != nil {
return err
}
+
+ validate := validator.New()
+ err = validate.Struct(s.Config)
+ if err != nil {
+ return err
+ }
return nil
}
}
// handleNewConnection takes a new net.Conn and performs the initial login sequence
-func (s *Server) handleNewConnection(conn net.Conn) error {
+func (s *Server) handleNewConnection(conn net.Conn, remoteAddr string) error {
defer dontPanic(s.Logger)
- handshakeBuf := make([]byte, 12)
- if _, err := io.ReadFull(conn, handshakeBuf); err != nil {
- return err
- }
- if err := Handshake(conn, handshakeBuf); err != nil {
+ if err := Handshake(conn); err != nil {
return err
}
return err
}
- c := s.NewClientConn(conn)
+ c := s.NewClientConn(conn, remoteAddr)
defer c.Disconnect()
encodedLogin := clientLogin.GetField(fieldUserLogin).Data
*c.Flags = []byte{0, 2}
}
- s.Logger.Infow("Client connection received", "login", login, "version", *c.Version, "RemoteAddr", conn.RemoteAddr().String())
+ s.Logger.Infow("Client connection received", "login", login, "version", *c.Version, "RemoteAddr", remoteAddr)
s.outbox <- c.NewReply(clientLogin,
NewField(fieldVersion, []byte{0x00, 0xbe}),
// Show agreement to client
c.Server.outbox <- *NewTransaction(tranShowAgreement, c.ID, NewField(fieldData, s.Agreement))
- // assume simplified hotline v1.2.3 login flow that does not require agreement
- if *c.Version == nil {
+ // Used simplified hotline v1.2.3 login flow for clients that do not send login info in tranAgreed
+ if *c.Version == nil || bytes.Equal(*c.Version, nostalgiaVersion) {
c.Agreed = true
c.notifyOthers(
}
case FileUpload:
destinationFile := s.Config.FileRoot + ReadFilePath(fileTransfer.FilePath) + "/" + string(fileTransfer.FileName)
- tmpFile := destinationFile + ".incomplete"
- file, err := effectiveFile(destinationFile)
+ var file *os.File
+
+ // A file upload has three possible cases:
+ // 1) Upload a new file
+ // 2) Resume a partially transferred file
+ // 3) Replace a fully uploaded file
+ // Unfortunately we have to infer which case applies by inspecting what is already on the file system
+
+ // 1) Check for existing file:
+ _, err := os.Stat(destinationFile)
+ if err == nil {
+ // If found, that means this upload is intended to replace the file
+ if err = os.Remove(destinationFile); err != nil {
+ return err
+ }
+ file, err = os.Create(destinationFile + incompleteFileSuffix)
+ }
if errors.Is(err, fs.ErrNotExist) {
- file, err = FS.Create(tmpFile)
+ // If not found, open or create a new incomplete file
+ file, err = os.OpenFile(destinationFile+incompleteFileSuffix, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0644)
if err != nil {
return err
}
git.r.bdr.sh / rbdr / mobius / blobdiff