Basic server implementation

19 files changed, 1013 insertions, 593 deletions

diff --git a/README.md b/README.md
index ee8e555..c24b68b 100644
--- a/README.md
+++ b/README.md
@@ -8,18 +8,28 @@ You'll need Go toolchain. Get it [here](https://go.dev/dl/)
 
 ```
 git clone https://git.sr.ht/~rctt/solec
-cd solecd
+cd solec
 go run cmd/daemon/main.go
 ```
 
+## Development
+
+Use following to setup Git hooks:
+`git config --local core.hooksPath hooks`
+
+* `tools/run.sh` - build and start server and few clients
+* `tools/build-spec.sh` - build Kaitai spec
+
 ## Wireshark plugin
 
 To build wireshark plugin you'll need Kaitai Struct Compiler.
 KSC currently doesn't support Wireshark plugin generation but
 [there is a discussion]("https://github.com/kaitai-io/kaitai_struct/issues/50#issuecomment-1485044090").
-After building foked KSC use `./build_spec.sh` to build the plugin and then put
+After building foked KSC use `./tools/build_spec.sh` to build the plugin and then put
 it into Wireshark plugins directory.
 
+There is a problem with dissecting specific payloads.
+
 ## TODO
 
 - Protocol
diff --git a/cmd/client/main.go b/cmd/client/main.go
index 6e5d996..2612267 100644
--- a/cmd/client/main.go
+++ b/cmd/client/main.go
@@ -4,58 +4,87 @@ import (
 	"flag"
 	"log"
 	"net"
+	"strings"
 	"time"
 
-	"git.sr.ht/~rctt/solecd/core"
+	"git.sr.ht/~rctt/solec/core"
+	"git.sr.ht/~rctt/solec/prompt"
 )
 
-var serverAddr string
+var (
+	serverAddr string
+	user       string
+	conn       net.Conn
+)
 
 func main() {
+	prompt.Commands["*"] = broadcast
+
 	flag.StringVar(&serverAddr, "a", "localhost:9999", "Server address:port")
+	flag.StringVar(&user, "u", "user", "username")
 	flag.Parse()
 
-	var d net.Dialer
+	var (
+		d   net.Dialer
+		err error
+	)
 
-	conn, err := d.Dial("tcp", serverAddr)
+	log.Println("connecting to " + serverAddr + " as " + user)
+
+	conn, err = d.Dial("tcp", serverAddr)
 	if err != nil {
 		log.Fatal("cannot dial: ", err)
 	}
 	defer conn.Close()
 
-	ping(conn)
+	hs := core.Handshake{0, 1}
+	if err := core.Send(conn, hs); err != nil {
+		panic(err)
+	}
+
+	auth := core.Auth{user, "pass"}
+	if err := core.Send(conn, auth); err != nil {
+		panic(err)
+	}
+
+	go prompt.Read()
+
+	read(conn)
 }
 
-func ping(conn net.Conn) {
+func read(conn net.Conn) {
 	for {
-		log.Print("ping")
-		data, err := core.Encode(core.Pong{Timestamp: time.Now()})
+		payload, err := core.Read(conn)
 		if err != nil {
 			panic(err)
 		}
-		if _, err := conn.Write(data); err != nil {
-			panic(err)
-		}
 
-		test := core.Test{
-			Num1:  1,
-			Time1: time.Now(),
-			Str1:  "test string",
-			Num2:  2,
-			Bin1:  []byte{0x01, 0x02, 0x03},
-			Num3:  3,
-			Str2:  "こんにちは",
-			Num4:  4,
-		}
+		handlePayload(conn, payload)
+	}
+}
 
-		data, err = core.Encode(test)
-		if err != nil {
-			panic(err)
-		}
-		if _, err = conn.Write(data); err != nil {
-			panic(err)
-		}
+func handlePayload(conn net.Conn, payload any) {
+	switch v := payload.(type) {
+	case core.Message:
+		handleMessage(conn, v)
+	}
+}
+
+func handleMessage(conn net.Conn, msg core.Message) {
+	log.Println("received message", msg.Source, "->", msg.Target, msg.Content)
+}
+
+func broadcast(args []string) {
+	msg := core.Message{
+		Source:    user,
+		Target:    "*",
+		Timestamp: time.Now(),
+		Content:   strings.Join(args[0:], " "),
+	}
+
+	log.Println(msg.Content)
 
-		time.Sleep(time.Second)
+	if err := core.Send(conn, msg); err != nil {
+		panic(err)
 	}
 }
diff --git a/cmd/daemon/main.go b/cmd/daemon/main.go
index b55cc69..56b7c16 100644
--- a/cmd/daemon/main.go
+++ b/cmd/daemon/main.go
@@ -1,39 +1,53 @@
 package main
 
 import (
-	"flag"
+	"bufio"
+	"fmt"
 	"log"
-	"net"
+	"maps"
+	"os"
+	"slices"
+	"strings"
 
-	"git.sr.ht/~rctt/solecd/core"
+	"git.sr.ht/~rctt/solec/server"
 )
 
-var listenAddr string
+var (
+	cmds = map[string]func(args []string){
+		"ping": sendPing,
+	}
 
-func main() {
-	flag.StringVar(&listenAddr, "a", "localhost:9999", "Listening address:port")
-	flag.Parse()
+	serv = server.NewServer("localhost:9999")
+)
 
-	log.Print("starting solec daemon mock")
-	log.Fatal(listen())
-}
+func main() {
+	fmt.Println("SOLEC MOCK SERVER")
+	fmt.Println("Commands:", slices.Sorted(maps.Keys(cmds)))
 
-func listen() error {
-	ln, err := net.Listen("tcp", listenAddr)
-	if err != nil {
-		return err
+	if err := serv.Start(); err != nil {
+		panic(err)
 	}
+	readCmds()
+}
 
-	log.Print("server is listening on: ", listenAddr)
+func readCmds() {
+	sc := bufio.NewScanner(os.Stdin)
+	for sc.Scan() {
+		args := strings.Split(sc.Text(), " ")
 
-	for {
-		conn, err := ln.Accept()
-		if err != nil {
-			log.Print("cannot accept connection: ", err)
+		cmd, ok := cmds[args[0]]
+		if !ok {
+			fmt.Println("unknown command")
+			continue
 		}
 
-		log.Print("received connection from: ", conn.RemoteAddr())
-
-		go core.ReadConnection(conn)
+		cmd(args[1:])
+	}
+	if err := sc.Err(); err != nil {
+		log.Println(err)
 	}
 }
+
+func sendPing(args []string) {
+
+}
diff --git a/cmd/mock/main.go b/cmd/mock/main.go
deleted file mode 100644
index c4c726c..0000000
--- a/cmd/mock/main.go
+++ /dev/null
@@ -1,41 +0,0 @@
-package main
-
-import (
-	"bufio"
-	"fmt"
-	"log"
-	"maps"
-	"os"
-	"slices"
-	"strings"
-)
-
-var cmds = map[string]func(args []string){
-	"ping": sendPing,
-}
-
-func main() {
-	fmt.Println("SOLEC MOCK SERVER")
-	fmt.Println("Commands:", slices.Sorted(maps.Keys(cmds)))
-
-	scanner := bufio.NewScanner(os.Stdin)
-	for scanner.Scan() {
-		args := strings.Split(scanner.Text(), " ")
-
-		cmd, ok := cmds[args[0]]
-		if !ok {
-			fmt.Println("unknown command")
-			continue
-		}
-
-		cmd(args[1:])
-	}
-
-	if err := scanner.Err(); err != nil {
-		log.Println(err)
-	}
-}
-
-func sendPing(args []string) {
-
-}
diff --git a/cmd/test/main.go b/cmd/test/main.go
index 35eddad..05768ea 100644
--- a/cmd/test/main.go
+++ b/cmd/test/main.go
@@ -5,7 +5,7 @@ import (
 	"fmt"
 	"time"
 
-	"git.sr.ht/~rctt/solecd/core"
+	"git.sr.ht/~rctt/solec/core"
 )
 
 func main() {
diff --git a/core/data.go b/core/data.go
index 16775db..b25b853 100644
--- a/core/data.go
+++ b/core/data.go
@@ -16,13 +16,21 @@ type PayloadType uint8
 
 const (
 	PayloadUnknown   PayloadType = 0x00
-	PayloadHandshake             = 0x01
-	PayloadPing                  = 0x02
-	PayloadPong                  = 0x03
-	PayloadMessage               = 0x04
+	PayloadSuccess               = 0x01
+	PayloadError                 = 0x02
+	PayloadHandshake             = 0x03
+	PayloadAuth                  = 0x04
+	PayloadMessage               = 0x05
 	PayloadTest                  = 0xFF
 )
 
+type ErrorType uint8
+
+const (
+	ErrorUnknown    ErrorType = 0x00
+	ErrorAuthFailed           = 0x01
+)
+
 type Frame struct {
 	Length  uint16
 	Type    PayloadType
@@ -41,12 +49,13 @@ func Encode(w Wrapper) ([]byte, error) {
 	for _, p := range payload {
 		switch v := p.(type) {
 		case string:
-			err := binary.Write(buf, binary.BigEndian, uint16(len(v)))
+			strBytes := []byte(v)
+			err := binary.Write(buf, binary.BigEndian, uint16(len(strBytes)))
 			if err != nil {
 				return []byte{}, fmt.Errorf("cannot encode string length: %v", err)
 			}
 
-			_, err = buf.WriteString(v)
+			_, err = buf.Write(strBytes)
 			if err != nil {
 				return []byte{}, fmt.Errorf("cannot encode string: %v", err)
 			}
@@ -100,11 +109,16 @@ func Decode(buf io.Reader) (any, error) {
 	}
 
 	switch pType {
+	case PayloadSuccess:
+		return Success{}, nil
+	case PayloadError:
+		return DecodeError(buf)
 	case PayloadHandshake:
 		return DecodeHandshake(buf)
-	case PayloadPing:
-	case PayloadPong:
+	case PayloadAuth:
+		return DecodeAuth(buf)
 	case PayloadMessage:
+		return DecodeMessage(buf)
 	case PayloadTest:
 		return DecodeTest(buf)
 	default:
diff --git a/core/data_test.go b/core/data_test.go
index 1275ef4..af986cc 100644
--- a/core/data_test.go
+++ b/core/data_test.go
@@ -1,6 +1,7 @@
 package core
 
 import (
+	"bytes"
 	"testing"
 	"time"
 
@@ -24,7 +25,7 @@ func TestEncoder(t *testing.T) {
 		t.Error(err)
 	}
 
-	out, err := Decode(data)
+	out, err := Decode(bytes.NewBuffer(data))
 	if err != nil {
 		t.Error(err)
 	}
diff --git a/core/network.go b/core/network.go
index c182e7f..932cdca 100644
--- a/core/network.go
+++ b/core/network.go
@@ -1,24 +1,19 @@
 package core
 
 import (
-	"fmt"
 	"net"
 )
 
-func ReadConnection(conn net.Conn) {
-	for {
-		payload, err := Decode(conn)
-		if err != nil {
-			panic(err)
-		}
-
-		if err := handle(payload); err != nil {
-			panic(err)
-		}
+func Send(conn net.Conn, payload Wrapper) error {
+	data, err := Encode(payload)
+	if err != nil {
+		return err
 	}
+
+	_, err = conn.Write(data)
+	return err
 }
 
-func handle(payload any) error {
-	fmt.Println(payload)
-	return nil
+func Read(conn net.Conn) (any, error) {
+	return Decode(conn)
 }
diff --git a/core/payload.go b/core/payload.go
index 0711040..b8e8b9f 100644
--- a/core/payload.go
+++ b/core/payload.go
@@ -5,6 +5,35 @@ import (
 	"time"
 )
 
+type Success struct{}
+
+func (s Success) Wrap() (PayloadType, []any) {
+	return PayloadSuccess, []any{}
+}
+
+type Error struct {
+	ErrorType ErrorType
+}
+
+func (e Error) Wrap() (PayloadType, []any) {
+	return PayloadError, []any{e.ErrorType}
+}
+
+func DecodeError(buf io.Reader) (Error, error) {
+	var (
+		errorData uint8
+		e         Error
+	)
+
+	err := decodeNumeric(buf, &errorData)
+	if err != nil {
+		return e, err
+	}
+
+	e.ErrorType = ErrorType(errorData)
+	return e, nil
+}
+
 type Handshake struct {
 	Major, Minor uint8
 }
@@ -31,30 +60,72 @@ func DecodeHandshake(buf io.Reader) (Handshake, error) {
 	return h, nil
 }
 
-type Ping struct{}
+type Auth struct {
+	Name string
+	Pass string
+}
 
-func (p Ping) Wrap() (PayloadType, []any) {
-	return PayloadPing, []any{}
+func (a Auth) Wrap() (PayloadType, []any) {
+	return PayloadAuth, []any{
+		a.Name, a.Pass,
+	}
 }
 
-type Pong struct {
+func DecodeAuth(buf io.Reader) (Auth, error) {
+	var a Auth
+	err := decodeString(buf, &a.Name)
+	if err != nil {
+		return a, err
+	}
+
+	err = decodeString(buf, &a.Pass)
+	if err != nil {
+		return a, err
+	}
+
+	return a, nil
+}
+
+type Message struct {
+	Source    string
+	Target    string
 	Timestamp time.Time
+	Content   string
 }
 
-func (p Pong) Wrap() (PayloadType, []any) {
-	return PayloadPong, []any{
-		p.Timestamp,
+func (m Message) Wrap() (PayloadType, []any) {
+	return PayloadMessage, []any{
+		m.Source,
+		m.Target,
+		m.Timestamp,
+		m.Content,
 	}
 }
 
-func DecodePong(buf io.Reader) (Pong, error) {
-	var p Pong
-	err := decodeTime(buf, &p.Timestamp)
+func DecodeMessage(buf io.Reader) (Message, error) {
+	var m Message
+
+	err := decodeString(buf, &m.Source)
+	if err != nil {
+		return m, err
+	}
+
+	err = decodeString(buf, &m.Target)
+	if err != nil {
+		return m, err
+	}
+
+	err = decodeTime(buf, &m.Timestamp)
+	if err != nil {
+		return m, err
+	}
+
+	err = decodeString(buf, &m.Content)
 	if err != nil {
-		return p, err
+		return m, err
 	}
 
-	return p, nil
+	return m, nil
 }
 
 type Test struct {
diff --git a/go.mod b/go.mod
index a4a5a0f..a5887e3 100644
--- a/go.mod
+++ b/go.mod
@@ -1,4 +1,4 @@
-module git.sr.ht/~rctt/solecd
+module git.sr.ht/~rctt/solec
 
 go 1.25.0
 
diff --git a/hooks/pre-commit b/hooks/pre-commit
new file mode 100755
index 0000000..422b855
--- /dev/null
+++ b/hooks/pre-commit
@@ -0,0 +1,8 @@
+#!/bin/sh
+
+if [ $(git rev-parse --abbrev-ref HEAD) != "main" ]; then
+	exit 0
+fi
+
+echo "Running tests before commit to main"
+go test ./...
\ No newline at end of file
diff --git a/prompt/prompt.go b/prompt/prompt.go
new file mode 100644
index 0000000..63c2a60
--- /dev/null
+++ b/prompt/prompt.go
@@ -0,0 +1,29 @@
+package prompt
+
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"os"
+	"strings"
+)
+
+var Commands = make(map[string]func(args []string))
+
+func Read() {
+	sc := bufio.NewScanner(os.Stdin)
+	for sc.Scan() {
+		args := strings.Split(sc.Text(), " ")
+
+		cmd, ok := Commands[args[0]]
+		if !ok {
+			fmt.Println("unknown command")
+			continue
+		}
+
+		cmd(args[1:])
+	}
+	if err := sc.Err(); err != nil {
+		log.Println(err)
+	}
+}
diff --git a/run.sh b/run.sh
deleted file mode 100755
index a33fad9..0000000
--- a/run.sh
+++ /dev/null
@@ -1,6 +0,0 @@
-#!/bin/sh
-
-tmux \
-	new-session  "go run cmd/daemon/main.go; read" \; \
-	split-window "sleep 0.5; go run cmd/client/main.go; read" \; \
-	select-layout even-horizontal;
\ No newline at end of file
diff --git a/server/server.go b/server/server.go
new file mode 100644
index 0000000..51e71b1
--- /dev/null
+++ b/server/server.go
@@ -0,0 +1,188 @@
+package server
+
+import (
+	"errors"
+	"fmt"
+	"log"
+	"net"
+	"sync"
+
+	"git.sr.ht/~rctt/solec/core"
+)
+
+type Server struct {
+	listenAddr string
+	users      map[string]User
+	mu         sync.Mutex
+}
+
+type User struct {
+	Name  string
+	Conns map[net.Conn]struct{}
+}
+
+func NewServer(listenAddr string) *Server {
+	return &Server{
+		listenAddr: listenAddr,
+		users:      make(map[string]User),
+	}
+}
+
+func (s *Server) Start() error {
+	ln, err := net.Listen("tcp", s.listenAddr)
+	if err != nil {
+		return err
+	}
+
+	for {
+		conn, err := ln.Accept()
+		if err != nil {
+			log.Print("cannot accept connection: ", err)
+		}
+
+		log.Print("received connection from: ", conn.RemoteAddr())
+
+		go s.handleConn(conn)
+	}
+}
+
+func (s *Server) handleConn(conn net.Conn) {
+	if err := s.performHandshake(conn); err != nil {
+		log.Println("handshake error", err)
+		return
+	}
+
+	user, err := s.performAuth(conn)
+	if err != nil {
+		log.Println("auth error", err)
+		return
+	}
+
+	defer func() {
+		s.mu.Lock()
+		log.Println("client disconnected: ", user.Name)
+		delete(s.users[user.Name].Conns, conn)
+		if len(s.users[user.Name].Conns) == 0 {
+			log.Println("all connections closed for user:", user.Name)
+			delete(s.users, user.Name)
+		}
+		s.mu.Unlock()
+	}()
+
+	if err := s.readInput(conn, user); err != nil {
+		log.Println("cannot read incomming data", err)
+	}
+}
+
+func (s *Server) performHandshake(conn net.Conn) error {
+	serverHs := core.Handshake{0, 1}
+
+	if err := core.Send(conn, serverHs); err != nil {
+		return err
+	}
+
+	clientPayload, err := core.Decode(conn)
+	if err != nil {
+		return err
+	}
+
+	clientHs, ok := clientPayload.(core.Handshake)
+	if !ok {
+		return errors.New("received payload of invalid type")
+	}
+
+	if serverHs.Major != clientHs.Major {
+		return errors.New("server and client are using different protocol version")
+	}
+
+	return nil
+}
+
+func (s *Server) performAuth(conn net.Conn) (User, error) {
+	clientPayload, err := core.Decode(conn)
+	if err != nil {
+		return User{}, err
+	}
+
+	clientAuth, ok := clientPayload.(core.Auth)
+	if !ok {
+		return User{}, errors.New("received payload of invalid type")
+	}
+
+	user, ok := s.users[clientAuth.Name]
+	if !ok {
+		log.Println("initial connection from user:", clientAuth.Name)
+		user = newUser(conn, clientAuth)
+		s.users[clientAuth.Name] = user
+		return user, nil
+	}
+
+	log.Println("next connection from user:", user.Name)
+	user.Conns[conn] = struct{}{}
+	return user, nil
+}
+
+func newUser(conn net.Conn, auth core.Auth) User {
+	u := User{
+		Name:  auth.Name,
+		Conns: make(map[net.Conn]struct{}),
+	}
+
+	u.Conns[conn] = struct{}{}
+	return u
+}
+
+func (s *Server) readInput(conn net.Conn, user User) error {
+	for {
+		payload, err := core.Decode(conn)
+		if err != nil {
+			return fmt.Errorf("decoder error: %w", err)
+		}
+		if err := s.handlePayload(conn, user, payload); err != nil {
+			return fmt.Errorf("payload handler error: %w", err)
+		}
+	}
+}
+
+func (s *Server) handlePayload(conn net.Conn, user User, payload any) error {
+	switch v := payload.(type) {
+	case core.Message:
+		return s.handleMessage(conn, user, v)
+
+	default:
+		return errors.New("invalid payload")
+	}
+}
+
+func (s *Server) handleMessage(conn net.Conn, user User, msg core.Message) error {
+	log.Println("message:", user.Name, "->", msg.Target, msg.Content)
+
+	if msg.Target == "*" {
+		return s.broadcastMessage(conn, user, msg)
+	}
+
+	return nil
+}
+
+func (s *Server) broadcastMessage(conn net.Conn, user User, msg core.Message) error {
+	for _, u := range s.users {
+		if u.Name == user.Name {
+			continue
+		}
+
+		for c := range u.Conns {
+			if err := core.Send(c, msg); err != nil {
+				log.Println("cannot send", err)
+			}
+		}
+	}
+
+	// Forward message for other connections from the same user
+	for c := range s.users[user.Name].Conns {
+		if err := core.Send(c, msg); err != nil {
+			log.Println("cannot send", err)
+		}
+	}
+
+	return nil
+}
diff --git a/solec.ksy b/solec.ksy
index e7c24e1..dcfcc11 100644
--- a/solec.ksy
+++ b/solec.ksy
@@ -3,15 +3,13 @@ meta:
   file-extension: hex
   endian: be
 
-doc: |
-  SOLEC protocol uses big endian encoding. Frames uses type-length-value format.
-
+doc: SOLEC protocol
 doc-ref: https://git.sr.ht/~rctt/solec/blob/main/solec.svg
 
 seq:
   - id: type_payload
     type: u1
-    enum: type
+    enum: payload_type
   - id: len_payload
     type: u2
   - id: payload
@@ -19,20 +17,25 @@ seq:
     type:
       switch-on: type_payload
       cases:
-        'type::handshake': handshake
-        'type::ping': ping
-        'type::pong': pong
-        'type::message': message
-        'type::test': test
+        'payload_type::success': success
+        'payload_type::error': error
+        'payload_type::handshake': handshake
+        'payload_type::auth': auth
+        'payload_type::message': message
+        'payload_type::test': test
 
 enums:
-  type:
-    0x01: handshake
-    0x02: ping
-    0x03: pong
-    0x04: message
+  payload_type:
+    0x01: success
+    0x02: error
+    0x03: handshake
+    0x04: auth
+    0x05: message
     0xFF: test
 
+  error_type:
+    0x01: auth_failed
+
 types:
   string:
     doc: UTF-8 encoded string.
@@ -52,6 +55,16 @@ types:
       - id: payload
         size: len_payload
 
+  success:
+    doc: Send from server if operation succeded.
+
+  error:
+    doc: Senf from server if operation failed.
+    seq:
+      - id: error_code
+        type: u1
+        enum: error_type
+
   handshake:
     doc: |
       Handshake is sent by the client during connection initialization.
@@ -63,16 +76,12 @@ types:
       - id: proto_ver_minor
         type: u1
 
-  ping:
-    doc: Ping does not contain any payload.
-
-  pong:
+  auth:
     seq:
-      - id: timestamp
-        doc: |
-          Timestamp is set just before sending the pong message. It can be used
-          to meassure packet's travel time between server and client.
-        type: u8
+      - id: name
+        type: string
+      - id: pass
+        type: string
 
   message:
     doc: |
diff --git a/solec.lua b/solec.lua
index a06a429..85efaad 100644
--- a/solec.lua
+++ b/solec.lua
@@ -32,14 +32,14 @@ table.insert(proto.fields, Solec_String_len_payload)
 local str_decode = require("string_decode")
 local Solec_String_payload = ProtoField.new('payload', 'Solec.String.payload', ftypes.STRINGZ)
 table.insert(proto.fields, Solec_String_payload)
+local Solec_Error_error_code = ProtoField.new('error_code', 'Solec.Error.error_code', ftypes.BYTES)
+table.insert(proto.fields, Solec_Error_error_code)
 local Solec_Handshake_proto_ver_major = ProtoField.new('proto_ver_major', 'Solec.Handshake.proto_ver_major', ftypes.UINT8)
 table.insert(proto.fields, Solec_Handshake_proto_ver_major)
 local Solec_Handshake_proto_ver_minor = ProtoField.new('proto_ver_minor', 'Solec.Handshake.proto_ver_minor', ftypes.UINT8)
 table.insert(proto.fields, Solec_Handshake_proto_ver_minor)
 local Solec_Message_timestamp = ProtoField.new('timestamp', 'Solec.Message.timestamp', ftypes.UINT32)
 table.insert(proto.fields, Solec_Message_timestamp)
-local Solec_Pong_timestamp = ProtoField.new('timestamp', 'Solec.Pong.timestamp', ftypes.UINT32)
-table.insert(proto.fields, Solec_Pong_timestamp)
 
 function proto.dissector(tvb, pinfo, root)
   pinfo.cols.protocol = 'Solec'
@@ -49,18 +49,23 @@ function proto.dissector(tvb, pinfo, root)
 end
 
 -- 
--- SOLEC protocol uses big endian encoding. Frames uses type-length-value format.
+-- SOLEC protocol.
 -- See also: Source (https://git.sr.ht/~rctt/solec/blob/main/solec.svg)
 Solec = class.class(KaitaiStruct)
 
-Solec.Type = enum.Enum {
-  handshake = 1,
-  ping = 2,
-  pong = 3,
-  message = 4,
+Solec.PayloadType = enum.Enum {
+  success = 1,
+  error = 2,
+  handshake = 3,
+  auth = 4,
+  message = 5,
   test = 255,
 }
 
+Solec.ErrorType = enum.Enum {
+  auth_failed = 1,
+}
+
 function Solec:_init(io, tree, parent, root)
   KaitaiStruct._init(self, io)
   self._parent = parent
@@ -71,43 +76,49 @@ end
 
 function Solec:_read()
   local _offset = self._io:pos()
-  self.type_payload = Solec.Type(self._io:read_u1())
+  self.type_payload = Solec.PayloadType(self._io:read_u1())
   self._tree:add(Solec_type_payload, self._io._io.tvb(_offset, self._io:pos() - _offset))
   local _offset = self._io:pos()
   self.len_payload = self._io:read_u2be()
   self._tree:add(Solec_len_payload, self._io._io.tvb(_offset, self._io:pos() - _offset), self.len_payload)
   local _offset = self._io:pos()
   local _on = self.type_payload
-  if _on == Solec.Type.message then
+  if _on == Solec.PayloadType.auth then
     self._raw_payload = self._io:read_bytes(self.len_payload)
     local _tvb = self._io._io.tvb(_offset, self._io:pos() - _offset)
     local _io = KaitaiStream(TVBStream(_tvb))
     local _tree = self._tree:add(_tvb, 'payload')
-    self.payload = Solec.Message(_io, _tree, self, self._root)
-  elseif _on == Solec.Type.ping then
+    self.payload = Solec.Auth(_io, _tree, self, self._root)
+  elseif _on == Solec.PayloadType.handshake then
     self._raw_payload = self._io:read_bytes(self.len_payload)
     local _tvb = self._io._io.tvb(_offset, self._io:pos() - _offset)
     local _io = KaitaiStream(TVBStream(_tvb))
     local _tree = self._tree:add(_tvb, 'payload')
-    self.payload = Solec.Ping(_io, _tree, self, self._root)
-  elseif _on == Solec.Type.pong then
+    self.payload = Solec.Handshake(_io, _tree, self, self._root)
+  elseif _on == Solec.PayloadType.test then
     self._raw_payload = self._io:read_bytes(self.len_payload)
     local _tvb = self._io._io.tvb(_offset, self._io:pos() - _offset)
     local _io = KaitaiStream(TVBStream(_tvb))
     local _tree = self._tree:add(_tvb, 'payload')
-    self.payload = Solec.Pong(_io, _tree, self, self._root)
-  elseif _on == Solec.Type.test then
+    self.payload = Solec.Test(_io, _tree, self, self._root)
+  elseif _on == Solec.PayloadType.error then
     self._raw_payload = self._io:read_bytes(self.len_payload)
     local _tvb = self._io._io.tvb(_offset, self._io:pos() - _offset)
     local _io = KaitaiStream(TVBStream(_tvb))
     local _tree = self._tree:add(_tvb, 'payload')
-    self.payload = Solec.Test(_io, _tree, self, self._root)
-  elseif _on == Solec.Type.handshake then
+    self.payload = Solec.Error(_io, _tree, self, self._root)
+  elseif _on == Solec.PayloadType.success then
     self._raw_payload = self._io:read_bytes(self.len_payload)
     local _tvb = self._io._io.tvb(_offset, self._io:pos() - _offset)
     local _io = KaitaiStream(TVBStream(_tvb))
     local _tree = self._tree:add(_tvb, 'payload')
-    self.payload = Solec.Handshake(_io, _tree, self, self._root)
+    self.payload = Solec.Success(_io, _tree, self, self._root)
+  elseif _on == Solec.PayloadType.message then
+    self._raw_payload = self._io:read_bytes(self.len_payload)
+    local _tvb = self._io._io.tvb(_offset, self._io:pos() - _offset)
+    local _io = KaitaiStream(TVBStream(_tvb))
+    local _tree = self._tree:add(_tvb, 'payload')
+    self.payload = Solec.Message(_io, _tree, self, self._root)
   else
     self.payload = self._io:read_bytes(self.len_payload)
   end
@@ -158,6 +169,22 @@ end
 
 
 -- 
+-- Send from server if operation succeded.
+Solec.Success = class.class(KaitaiStruct)
+
+function Solec.Success:_init(io, tree, parent, root)
+  KaitaiStruct._init(self, io)
+  self._parent = parent
+  self._root = root or self
+  self._tree = tree
+  self:_read()
+end
+
+function Solec.Success:_read()
+end
+
+
+-- 
 -- Binary data of unspecifed type.
 Solec.Binary = class.class(KaitaiStruct)
 
@@ -179,6 +206,28 @@ function Solec.Binary:_read()
 end
 
 
+Solec.Auth = class.class(KaitaiStruct)
+
+function Solec.Auth:_init(io, tree, parent, root)
+  KaitaiStruct._init(self, io)
+  self._parent = parent
+  self._root = root or self
+  self._tree = tree
+  self:_read()
+end
+
+function Solec.Auth:_read()
+  local _offset = self._io:pos()
+  local _tree = self._tree:add(self._io._io.tvb(_offset, 0), 'name')
+  self.name = Solec.String(self._io, _tree, self, self._root)
+  _tree:set_len(self._io:pos() - _offset)
+  local _offset = self._io:pos()
+  local _tree = self._tree:add(self._io._io.tvb(_offset, 0), 'pass')
+  self.pass = Solec.String(self._io, _tree, self, self._root)
+  _tree:set_len(self._io:pos() - _offset)
+end
+
+
 -- 
 -- UTF-8 encoded string.
 Solec.String = class.class(KaitaiStruct)
@@ -202,10 +251,10 @@ end
 
 
 -- 
--- Ping does not contain any payload.
-Solec.Ping = class.class(KaitaiStruct)
+-- Senf from server if operation failed.
+Solec.Error = class.class(KaitaiStruct)
 
-function Solec.Ping:_init(io, tree, parent, root)
+function Solec.Error:_init(io, tree, parent, root)
   KaitaiStruct._init(self, io)
   self._parent = parent
   self._root = root or self
@@ -213,7 +262,10 @@ function Solec.Ping:_init(io, tree, parent, root)
   self:_read()
 end
 
-function Solec.Ping:_read()
+function Solec.Error:_read()
+  local _offset = self._io:pos()
+  self.error_code = Solec.ErrorType(self._io:read_u1())
+  self._tree:add(Solec_Error_error_code, self._io._io.tvb(_offset, self._io:pos() - _offset), self.error_code)
 end
 
 
@@ -274,25 +326,5 @@ end
 -- 
 -- Set just before sending the message.
 
-Solec.Pong = class.class(KaitaiStruct)
-
-function Solec.Pong:_init(io, tree, parent, root)
-  KaitaiStruct._init(self, io)
-  self._parent = parent
-  self._root = root or self
-  self._tree = tree
-  self:_read()
-end
-
-function Solec.Pong:_read()
-  local _offset = self._io:pos()
-  self.timestamp = self._io:read_u8be()
-  self._tree:add(Solec_Pong_timestamp, self._io._io.tvb(_offset, self._io:pos() - _offset), self.timestamp)
-end
-
--- 
--- Timestamp is set just before sending the pong message. It can be used
--- to meassure packet's travel time between server and client.
-
 local tcp_port = DissectorTable.get("tcp.port")
 tcp_port:add(9999, proto)
diff --git a/solec.svg b/solec.svg
index 63e66fe..40365b4 100644
--- a/solec.svg
+++ b/solec.svg
@@ -4,472 +4,531 @@
 <!-- Generated by graphviz version 14.1.3 (20260303.0454)
  -->
 <!-- Pages: 1 -->
-<svg width="1053pt" height="796pt"
- viewBox="0.00 0.00 1053.00 796.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
-<g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 792)">
-<polygon fill="white" stroke="none" points="-4,4 -4,-792 1049.25,-792 1049.25,4 -4,4"/>
+<svg width="1130pt" height="920pt"
+ viewBox="0.00 0.00 1130.00 920.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+<g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 916)">
+<polygon fill="white" stroke="none" points="-4,4 -4,-916 1125.75,-916 1125.75,4 -4,4"/>
 <g id="clust1" class="cluster">
 <title>cluster__solec</title>
-<polygon fill="none" stroke="black" stroke-dasharray="1,5" points="8,-8 8,-780 1037.25,-780 1037.25,-8 8,-8"/>
-<text xml:space="preserve" text-anchor="middle" x="522.62" y="-762.7" font-family="Times,serif" font-size="14.00">Solec</text>
+<polygon fill="none" stroke="black" stroke-dasharray="1,5" points="8,-8 8,-904 1113.75,-904 1113.75,-8 8,-8"/>
+<text xml:space="preserve" text-anchor="middle" x="560.88" y="-886.7" font-family="Times,serif" font-size="14.00">Solec</text>
 </g>
 <g id="clust2" class="cluster">
-<title>cluster__binary</title>
-<polygon fill="none" stroke="black" stroke-dasharray="1,5" points="779.75,-61 779.75,-195 1012.75,-195 1012.75,-61 779.75,-61"/>
-<text xml:space="preserve" text-anchor="middle" x="896.25" y="-177.7" font-family="Times,serif" font-size="14.00">Solec::Binary</text>
+<title>cluster__auth</title>
+<polygon fill="none" stroke="black" stroke-dasharray="1,5" points="621.25,-755 621.25,-871 780,-871 780,-755 621.25,-755"/>
+<text xml:space="preserve" text-anchor="middle" x="700.62" y="-853.7" font-family="Times,serif" font-size="14.00">Solec::Auth</text>
 </g>
 <g id="clust3" class="cluster">
-<title>cluster__handshake</title>
-<polygon fill="none" stroke="black" stroke-dasharray="1,5" points="532,-631 532,-747 743.25,-747 743.25,-631 532,-631"/>
-<text xml:space="preserve" text-anchor="middle" x="637.62" y="-729.7" font-family="Times,serif" font-size="14.00">Solec::Handshake</text>
+<title>cluster__binary</title>
+<polygon fill="none" stroke="black" stroke-dasharray="1,5" points="856.25,-61 856.25,-195 1089.25,-195 1089.25,-61 856.25,-61"/>
+<text xml:space="preserve" text-anchor="middle" x="972.75" y="-177.7" font-family="Times,serif" font-size="14.00">Solec::Binary</text>
 </g>
 <g id="clust4" class="cluster">
-<title>cluster__message</title>
-<polygon fill="none" stroke="black" stroke-dasharray="1,5" points="544.38,-462 544.38,-623 730.88,-623 730.88,-462 544.38,-462"/>
-<text xml:space="preserve" text-anchor="middle" x="637.62" y="-605.7" font-family="Times,serif" font-size="14.00">Solec::Message</text>
+<title>cluster__error</title>
+<polygon fill="none" stroke="black" stroke-dasharray="1,5" points="581.5,-653 581.5,-747 819.75,-747 819.75,-653 581.5,-653"/>
+<text xml:space="preserve" text-anchor="middle" x="700.62" y="-729.7" font-family="Times,serif" font-size="14.00">Solec::Error</text>
 </g>
 <g id="clust5" class="cluster">
-<title>cluster__ping</title>
-<polygon fill="none" stroke="black" stroke-dasharray="1,5" points="572.88,-377 572.88,-454 702.38,-454 702.38,-377 572.88,-377"/>
-<text xml:space="preserve" text-anchor="middle" x="637.62" y="-436.7" font-family="Times,serif" font-size="14.00">Solec::Ping</text>
+<title>cluster__handshake</title>
+<polygon fill="none" stroke="black" stroke-dasharray="1,5" points="595,-529 595,-645 806.25,-645 806.25,-529 595,-529"/>
+<text xml:space="preserve" text-anchor="middle" x="700.62" y="-627.7" font-family="Times,serif" font-size="14.00">Solec::Handshake</text>
 </g>
 <g id="clust6" class="cluster">
-<title>cluster__pong</title>
-<polygon fill="none" stroke="black" stroke-dasharray="1,5" points="547.75,-275 547.75,-369 727.5,-369 727.5,-275 547.75,-275"/>
-<text xml:space="preserve" text-anchor="middle" x="637.62" y="-351.7" font-family="Times,serif" font-size="14.00">Solec::Pong</text>
+<title>cluster__message</title>
+<polygon fill="none" stroke="black" stroke-dasharray="1,5" points="607.38,-360 607.38,-521 793.88,-521 793.88,-360 607.38,-360"/>
+<text xml:space="preserve" text-anchor="middle" x="700.62" y="-503.7" font-family="Times,serif" font-size="14.00">Solec::Message</text>
 </g>
 <g id="clust7" class="cluster">
 <title>cluster__string</title>
-<polygon fill="none" stroke="black" stroke-dasharray="1,5" points="763.25,-439 763.25,-573 1029.25,-573 1029.25,-439 763.25,-439"/>
-<text xml:space="preserve" text-anchor="middle" x="896.25" y="-555.7" font-family="Times,serif" font-size="14.00">Solec::String</text>
+<polygon fill="none" stroke="black" stroke-dasharray="1,5" points="839.75,-382 839.75,-516 1105.75,-516 1105.75,-382 839.75,-382"/>
+<text xml:space="preserve" text-anchor="middle" x="972.75" y="-498.7" font-family="Times,serif" font-size="14.00">Solec::String</text>
 </g>
 <g id="clust8" class="cluster">
+<title>cluster__success</title>
+<polygon fill="none" stroke="black" stroke-dasharray="1,5" points="635.88,-275 635.88,-352 765.38,-352 765.38,-275 635.88,-275"/>
+<text xml:space="preserve" text-anchor="middle" x="700.62" y="-334.7" font-family="Times,serif" font-size="14.00">Solec::Success</text>
+</g>
+<g id="clust9" class="cluster">
 <title>cluster__test</title>
-<polygon fill="none" stroke="black" stroke-dasharray="1,5" points="555.62,-16 555.62,-267 719.62,-267 719.62,-16 555.62,-16"/>
-<text xml:space="preserve" text-anchor="middle" x="637.62" y="-249.7" font-family="Times,serif" font-size="14.00">Solec::Test</text>
+<polygon fill="none" stroke="black" stroke-dasharray="1,5" points="618.62,-16 618.62,-267 782.62,-267 782.62,-16 618.62,-16"/>
+<text xml:space="preserve" text-anchor="middle" x="700.62" y="-249.7" font-family="Times,serif" font-size="14.00">Solec::Test</text>
 </g>
 <!-- solec__seq -->
 <g id="node1" class="node">
 <title>solec__seq</title>
-<polygon fill="#e0ffe0" stroke="none" points="24,-469.5 24,-492 48.75,-492 48.75,-469.5 24,-469.5"/>
-<polygon fill="none" stroke="black" points="24,-469.5 24,-492 48.75,-492 48.75,-469.5 24,-469.5"/>
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-<polygon fill="#e0ffe0" stroke="none" points="48.75,-469.5 48.75,-492 75.75,-492 75.75,-469.5 48.75,-469.5"/>
-<polygon fill="none" stroke="black" points="48.75,-469.5 48.75,-492 75.75,-492 75.75,-469.5 48.75,-469.5"/>
-<text xml:space="preserve" text-anchor="start" x="51.75" y="-476.25" font-family="Times,serif" font-size="14.00">size</text>
-<polygon fill="#e0ffe0" stroke="none" points="75.75,-469.5 75.75,-492 202.5,-492 202.5,-469.5 75.75,-469.5"/>
-<polygon fill="none" stroke="black" points="75.75,-469.5 75.75,-492 202.5,-492 202.5,-469.5 75.75,-469.5"/>
-<text xml:space="preserve" text-anchor="start" x="127.5" y="-476.25" font-family="Times,serif" font-size="14.00">type</text>
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-<polygon fill="none" stroke="black" points="202.5,-469.5 202.5,-492 281.25,-492 281.25,-469.5 202.5,-469.5"/>
-<text xml:space="preserve" text-anchor="start" x="236.62" y="-476.25" font-family="Times,serif" font-size="14.00">id</text>
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-<text xml:space="preserve" text-anchor="start" x="33" y="-431.25" font-family="Times,serif" font-size="14.00">1</text>
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-<text xml:space="preserve" text-anchor="start" x="78.75" y="-408.75" font-family="Times,serif" font-size="14.00">switch (type_payload)</text>
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-<text xml:space="preserve" text-anchor="start" x="220.5" y="-408.75" font-family="Times,serif" font-size="14.00">payload</text>
+<polygon fill="#e0ffe0" stroke="none" points="24,-567.5 24,-590 48.75,-590 48.75,-567.5 24,-567.5"/>
+<polygon fill="none" stroke="black" points="24,-567.5 24,-590 48.75,-590 48.75,-567.5 24,-567.5"/>
+<text xml:space="preserve" text-anchor="start" x="27" y="-574.25" font-family="Times,serif" font-size="14.00">pos</text>
+<polygon fill="#e0ffe0" stroke="none" points="48.75,-567.5 48.75,-590 75.75,-590 75.75,-567.5 48.75,-567.5"/>
+<polygon fill="none" stroke="black" points="48.75,-567.5 48.75,-590 75.75,-590 75.75,-567.5 48.75,-567.5"/>
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+<g id="edge8" class="edge">
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+<!-- solec__seq_payload_switch&#45;&gt;auth__seq -->
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-<text xml:space="preserve" text-anchor="start" x="955.88" y="-458" font-family="Times,serif" font-size="14.00">payload</text>
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 <!-- message__seq&#45;&gt;string__seq -->
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+<g id="edge12" class="edge">
 <title>message__seq:source_type&#45;&gt;string__seq</title>
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 <!-- message__seq&#45;&gt;string__seq -->
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 <!-- message__seq&#45;&gt;string__seq -->
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+<polygon fill="black" stroke="black" stroke-width="2" points="834.52,-391.5 844.99,-389.84 835.78,-384.61 834.52,-391.5"/>
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 <title>string__seq:len_payload_type&#45;&gt;string__seq:payload_size</title>
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-<polygon fill="black" stroke="black" stroke-width="2" points="774.85,-110.09 784.85,-106.61 774.86,-103.09 774.85,-110.09"/>
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diff --git a/build_spec.sh b/tools/build_spec.sh
index dfebbd2..dfebbd2 100755
--- a/build_spec.sh
+++ b/tools/build_spec.sh
diff --git a/tools/run.sh b/tools/run.sh
new file mode 100755
index 0000000..dbe0bf0
--- /dev/null
+++ b/tools/run.sh
@@ -0,0 +1,8 @@
+#!/bin/sh
+
+tmux \
+	new-session  "go run cmd/daemon/main.go; read" \; \
+	split-window "sleep 0.5; go run cmd/client/main.go -u user1; read" \; \
+	split-window "sleep 0.5; go run cmd/client/main.go -u user2; read" \; \
+	split-window "sleep 0.5; go run cmd/client/main.go -u user3; read" \; \
+	select-layout tiled;
\ No newline at end of file