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mtproto.go
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mtproto.go
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package mtproto
import (
"errors"
"fmt"
"math/rand"
"net"
"os"
"runtime"
"sync"
"time"
)
const (
appId = 41994
appHash = "269069e15c81241f5670c397941016a2"
)
type MTProto struct {
addr string
conn *net.TCPConn
f *os.File
queueSend chan packetToSend
stopSend chan struct{}
stopRead chan struct{}
stopPing chan struct{}
allDone chan struct{}
authKey []byte
authKeyHash []byte
serverSalt []byte
encrypted bool
sessionId int64
mutex *sync.Mutex
lastSeqNo int32
msgsIdToAck map[int64]packetToSend
msgsIdToResp map[int64]chan TL
seqNo int32
msgId int64
dclist map[int32]string
}
type packetToSend struct {
msg TL
resp chan TL
}
func NewMTProto(authkeyfile string) (*MTProto, error) {
var err error
m := new(MTProto)
m.f, err = os.OpenFile(authkeyfile, os.O_RDWR|os.O_CREATE, 0600)
if err != nil {
return nil, err
}
err = m.readData()
if err == nil {
m.encrypted = true
} else {
m.addr = "149.154.167.50:443"
m.encrypted = false
}
rand.Seed(time.Now().UnixNano())
m.sessionId = rand.Int63()
return m, nil
}
func (m *MTProto) Connect() error {
var err error
var tcpAddr *net.TCPAddr
// connect
tcpAddr, err = net.ResolveTCPAddr("tcp", m.addr)
if err != nil {
return err
}
m.conn, err = net.DialTCP("tcp", nil, tcpAddr)
if err != nil {
return err
}
_, err = m.conn.Write([]byte{0xef})
if err != nil {
return err
}
// get new authKey if need
if !m.encrypted {
err = m.makeAuthKey()
if err != nil {
return err
}
}
// start goroutines
m.queueSend = make(chan packetToSend, 64)
m.stopSend = make(chan struct{}, 1)
m.stopRead = make(chan struct{}, 1)
m.stopPing = make(chan struct{}, 1)
m.allDone = make(chan struct{}, 3)
m.msgsIdToAck = make(map[int64]packetToSend)
m.msgsIdToResp = make(map[int64]chan TL)
m.mutex = &sync.Mutex{}
go m.sendRoutine()
go m.readRoutine()
var resp chan TL
var x TL
// (help_getConfig)
resp = make(chan TL, 1)
m.queueSend <- packetToSend{
TL_invokeWithLayer{
layer,
TL_initConnection{
appId,
"Unknown",
runtime.GOOS + "/" + runtime.GOARCH,
"0.0.4",
"en",
TL_help_getConfig{},
},
},
resp,
}
x = <-resp
switch x.(type) {
case TL_config:
m.dclist = make(map[int32]string, 5)
for _, v := range x.(TL_config).dc_options {
v := v.(TL_dcOption)
m.dclist[v.id] = fmt.Sprintf("%s:%d", v.ip_address, v.port)
}
default:
return fmt.Errorf("Got: %T", x)
}
// start keepalive pinging
go m.pingRoutine()
return nil
}
func (m *MTProto) reconnect(newaddr string) error {
var err error
// stop ping routine
m.stopPing <- struct{}{}
close(m.stopPing)
// stop send routine
m.stopSend <- struct{}{}
close(m.stopSend)
// stop read routine
m.stopRead <- struct{}{}
close(m.stopRead)
<-m.allDone
<-m.allDone
<-m.allDone
// close send queue
close(m.queueSend)
// close connection
err = m.conn.Close()
if err != nil {
return err
}
// renew connection
m.encrypted = false
m.addr = newaddr
err = m.Connect()
return err
}
func (m *MTProto) Auth(phonenumber string) error {
var authSentCode TL_auth_sentCode
flag := true
for flag {
resp := make(chan TL, 1)
m.queueSend <- packetToSend{TL_auth_sendCode{phonenumber, 0, appId, appHash, "en"}, resp}
x := <-resp
switch x.(type) {
case TL_auth_sentCode:
authSentCode = x.(TL_auth_sentCode)
flag = false
case TL_rpc_error:
x := x.(TL_rpc_error)
if x.error_code != 303 {
return fmt.Errorf("RPC error_code: %d", x.error_code)
}
var newDc int32
n, _ := fmt.Sscanf(x.error_message, "PHONE_MIGRATE_%d", &newDc)
if n != 1 {
n, _ := fmt.Sscanf(x.error_message, "NETWORK_MIGRATE_%d", &newDc)
if n != 1 {
return fmt.Errorf("RPC error_string: %s", x.error_message)
}
}
newDcAddr, ok := m.dclist[newDc]
if !ok {
return fmt.Errorf("Wrong DC index: %d", newDc)
}
err := m.reconnect(newDcAddr)
if err != nil {
return err
}
default:
return fmt.Errorf("Got: %T", x)
}
}
var code int
fmt.Print("Enter code: ")
fmt.Scanf("%d", &code)
if toBool(authSentCode.phone_registered) {
resp := make(chan TL, 1)
m.queueSend <- packetToSend{
TL_auth_signIn{phonenumber, authSentCode.phone_code_hash, fmt.Sprintf("%d", code)},
resp,
}
x := <-resp
auth, ok := x.(TL_auth_authorization)
if !ok {
return fmt.Errorf("RPC: %#v", x)
}
userSelf := auth.user.(TL_userSelf)
fmt.Printf("Signed in: id %d name <%s %s>\n", userSelf.id, userSelf.first_name, userSelf.last_name)
} else {
return errors.New("Cannot sign up yet")
}
return nil
}
func (m *MTProto) GetContacts() error {
resp := make(chan TL, 1)
m.queueSend <- packetToSend{TL_contacts_getContacts{""}, resp}
x := <-resp
list, ok := x.(TL_contacts_contacts)
if !ok {
return fmt.Errorf("RPC: %#v", x)
}
contacts := make(map[int32]TL_userContact)
for _, v := range list.users {
if v, ok := v.(TL_userContact); ok {
contacts[v.id] = v
}
}
fmt.Printf(
"\033[33m\033[1m%10s %10s %-30s %-20s\033[0m\n",
"id", "mutual", "name", "username",
)
for _, v := range list.contacts {
v := v.(TL_contact)
fmt.Printf(
"%10d %10t %-30s %-20s\n",
v.user_id,
toBool(v.mutual),
fmt.Sprintf("%s %s", contacts[v.user_id].first_name, contacts[v.user_id].last_name),
contacts[v.user_id].username,
)
}
return nil
}
func (m *MTProto) SendMessage(user_id int32, msg string) error {
resp := make(chan TL, 1)
m.queueSend <- packetToSend{
TL_messages_sendMessage{
TL_inputPeerContact{user_id},
msg,
rand.Int63(),
},
resp,
}
x := <-resp
_, ok := x.(TL_messages_sentMessage)
if !ok {
return fmt.Errorf("RPC: %#v", x)
}
return nil
}
func (m *MTProto) pingRoutine() {
for {
select {
case <-m.stopPing:
m.allDone <- struct{}{}
return
case <-time.After(60 * time.Second):
m.queueSend <- packetToSend{TL_ping{0xCADACADA}, nil}
}
}
}
func (m *MTProto) sendRoutine() {
for x := range m.queueSend {
err := m.sendPacket(x.msg, x.resp)
if err != nil {
fmt.Println("SendRoutine:", err)
os.Exit(2)
}
}
m.allDone <- struct{}{}
}
func (m *MTProto) readRoutine() {
for {
data, err := m.read(m.stopRead)
if err != nil {
fmt.Println("ReadRoutine:", err)
os.Exit(2)
}
if data == nil {
m.allDone <- struct{}{}
return
}
m.process(m.msgId, m.seqNo, data)
}
}
func (m *MTProto) process(msgId int64, seqNo int32, data interface{}) interface{} {
switch data.(type) {
case TL_msg_container:
data := data.(TL_msg_container).items
for _, v := range data {
m.process(v.msg_id, v.seq_no, v.data)
}
case TL_bad_server_salt:
data := data.(TL_bad_server_salt)
m.serverSalt = data.new_server_salt
_ = m.saveData()
m.mutex.Lock()
for k, v := range m.msgsIdToAck {
delete(m.msgsIdToAck, k)
m.queueSend <- v
}
m.mutex.Unlock()
case TL_new_session_created:
data := data.(TL_new_session_created)
m.serverSalt = data.server_salt
_ = m.saveData()
case TL_ping:
data := data.(TL_ping)
m.queueSend <- packetToSend{TL_pong{msgId, data.ping_id}, nil}
case TL_pong:
// (ignore)
case TL_msgs_ack:
data := data.(TL_msgs_ack)
m.mutex.Lock()
for _, v := range data.msgIds {
delete(m.msgsIdToAck, v)
}
m.mutex.Unlock()
case TL_rpc_result:
data := data.(TL_rpc_result)
x := m.process(msgId, seqNo, data.obj)
m.mutex.Lock()
v, ok := m.msgsIdToResp[data.req_msg_id]
if ok {
v <- x.(TL)
close(v)
delete(m.msgsIdToResp, data.req_msg_id)
}
delete(m.msgsIdToAck, data.req_msg_id)
m.mutex.Unlock()
default:
return data
}
if (seqNo & 1) == 1 {
m.queueSend <- packetToSend{TL_msgs_ack{[]int64{msgId}}, nil}
}
return nil
}
func (m *MTProto) saveData() (err error) {
m.encrypted = true
b := NewEncodeBuf(1024)
b.StringBytes(m.authKey)
b.StringBytes(m.authKeyHash)
b.StringBytes(m.serverSalt)
b.String(m.addr)
err = m.f.Truncate(0)
if err != nil {
return err
}
_, err = m.f.WriteAt(b.buf, 0)
if err != nil {
return err
}
return nil
}
func (m *MTProto) readData() (err error) {
b := make([]byte, 1024*4)
n, err := m.f.ReadAt(b, 0)
if n <= 0 {
return errors.New("New session")
}
d := NewDecodeBuf(b)
m.authKey = d.StringBytes()
m.authKeyHash = d.StringBytes()
m.serverSalt = d.StringBytes()
m.addr = d.String()
if d.err != nil {
return d.err
}
return nil
}