mirror of
https://github.com/bjdgyc/anylink.git
synced 2025-11-01 00:59:34 +08:00
319 lines
6.4 KiB
Go
319 lines
6.4 KiB
Go
package sessdata
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import (
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"crypto/md5"
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"fmt"
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"math/rand"
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"net"
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"strconv"
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"strings"
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"sync"
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"sync/atomic"
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"time"
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"github.com/bjdgyc/anylink/base"
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"github.com/bjdgyc/anylink/dbdata"
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)
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var (
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// session_token -> SessUser
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sessions = make(map[string]*Session)
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sessMux sync.Mutex
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)
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// 连接sess
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type ConnSession struct {
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Sess *Session
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MasterSecret string // dtls协议的 master_secret
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IpAddr net.IP // 分配的ip地址
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LocalIp net.IP
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MacHw net.HardwareAddr // 客户端mac地址,从Session取出
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RemoteAddr string
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Mtu int
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TunName string
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Client string // 客户端 mobile pc
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CstpDpd int
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Group *dbdata.Group
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Limit *LimitRater
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BandwidthUp uint32 // 使用上行带宽 Byte
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BandwidthDown uint32 // 使用下行带宽 Byte
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BandwidthUpPeriod uint32 // 前一周期的总量
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BandwidthDownPeriod uint32
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BandwidthUpAll uint32 // 使用上行带宽总量
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BandwidthDownAll uint32 // 使用下行带宽总量
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closeOnce sync.Once
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CloseChan chan struct{}
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PayloadIn chan *Payload
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PayloadOut chan *Payload
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}
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type Session struct {
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mux sync.Mutex
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Sid string // auth返回的 session-id
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Token string // session信息的唯一token
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DtlsSid string // dtls协议的 session_id
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MacAddr string // 客户端mac地址
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UniqueIdGlobal string // 客户端唯一标示
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Username string // 用户名
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Group string
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AuthStep string
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AuthPass string
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LastLogin time.Time
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IsActive bool
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// 开启link需要设置的参数
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CSess *ConnSession
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}
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func init() {
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rand.Seed(time.Now().UnixNano())
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}
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func checkSession() {
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// 检测过期的session
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go func() {
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if base.Cfg.SessionTimeout == 0 {
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return
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}
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timeout := time.Duration(base.Cfg.SessionTimeout) * time.Second
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tick := time.NewTicker(time.Second * 60)
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for range tick.C {
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sessMux.Lock()
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t := time.Now()
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for k, v := range sessions {
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v.mux.Lock()
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if !v.IsActive {
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if t.Sub(v.LastLogin) > timeout {
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delete(sessions, k)
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}
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}
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v.mux.Unlock()
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}
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sessMux.Unlock()
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}
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}()
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}
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func GenToken() string {
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// 生成32位的 token
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btoken := make([]byte, 32)
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rand.Read(btoken)
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return fmt.Sprintf("%x", btoken)
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}
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func NewSession(token string) *Session {
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if token == "" {
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btoken := make([]byte, 32)
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rand.Read(btoken)
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token = fmt.Sprintf("%x", btoken)
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}
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// 生成 dtlsn session_id
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dtlsid := make([]byte, 32)
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rand.Read(dtlsid)
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sess := &Session{
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Sid: fmt.Sprintf("%d", time.Now().Unix()),
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Token: token,
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DtlsSid: fmt.Sprintf("%x", dtlsid),
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LastLogin: time.Now(),
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}
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sessMux.Lock()
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sessions[token] = sess
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sessMux.Unlock()
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return sess
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}
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func (s *Session) NewConn() *ConnSession {
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s.mux.Lock()
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active := s.IsActive
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macAddr := s.MacAddr
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username := s.Username
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s.mux.Unlock()
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if active {
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s.CSess.Close()
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}
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limit := LimitClient(username, false)
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if !limit {
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return nil
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}
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// 获取客户端mac地址
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macHw, err := net.ParseMAC(macAddr)
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if err != nil {
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sum := md5.Sum([]byte(s.UniqueIdGlobal))
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macHw = sum[0:5] // 5个byte
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macHw = append([]byte{0x02}, macHw...)
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macAddr = macHw.String()
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}
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ip := AcquireIp(username, macAddr)
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if ip == nil {
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LimitClient(username, true)
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return nil
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}
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cSess := &ConnSession{
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Sess: s,
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MacHw: macHw,
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IpAddr: ip,
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closeOnce: sync.Once{},
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CloseChan: make(chan struct{}),
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PayloadIn: make(chan *Payload),
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PayloadOut: make(chan *Payload),
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}
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// 查询group信息
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group := &dbdata.Group{}
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err = dbdata.One("Name", s.Group, group)
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if err != nil {
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base.Error(err)
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cSess.Close()
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return nil
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}
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cSess.Group = group
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if group.Bandwidth > 0 {
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// 限流设置
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cSess.Limit = NewLimitRater(group.Bandwidth, group.Bandwidth)
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}
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go cSess.ratePeriod()
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s.mux.Lock()
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s.MacAddr = macAddr
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s.IsActive = true
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s.CSess = cSess
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s.mux.Unlock()
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return cSess
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}
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func (cs *ConnSession) Close() {
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cs.closeOnce.Do(func() {
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base.Info("closeOnce:", cs.IpAddr)
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cs.Sess.mux.Lock()
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defer cs.Sess.mux.Unlock()
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close(cs.CloseChan)
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cs.Sess.IsActive = false
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cs.Sess.LastLogin = time.Now()
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cs.Sess.CSess = nil
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ReleaseIp(cs.IpAddr, cs.Sess.MacAddr)
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LimitClient(cs.Sess.Username, true)
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})
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}
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const BandwidthPeriodSec = 2 // 流量速率统计周期(秒)
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func (cs *ConnSession) ratePeriod() {
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tick := time.NewTicker(time.Second * BandwidthPeriodSec)
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defer tick.Stop()
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for range tick.C {
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select {
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case <-cs.CloseChan:
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return
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default:
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}
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// 实时流量清零
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rtUp := atomic.SwapUint32(&cs.BandwidthUp, 0)
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rtDown := atomic.SwapUint32(&cs.BandwidthDown, 0)
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// 设置上一周期每秒的流量
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atomic.SwapUint32(&cs.BandwidthUpPeriod, rtUp/BandwidthPeriodSec)
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atomic.SwapUint32(&cs.BandwidthDownPeriod, rtDown/BandwidthPeriodSec)
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// 累加所有流量
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atomic.AddUint32(&cs.BandwidthUpAll, rtUp)
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atomic.AddUint32(&cs.BandwidthDownAll, rtDown)
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}
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}
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const MaxMtu = 1460
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func (cs *ConnSession) SetMtu(mtu string) {
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cs.Mtu = MaxMtu
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mi, err := strconv.Atoi(mtu)
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if err != nil || mi < 100 {
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return
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}
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if mi < MaxMtu {
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cs.Mtu = mi
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}
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}
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func (cs *ConnSession) SetTunName(name string) {
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cs.Sess.mux.Lock()
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defer cs.Sess.mux.Unlock()
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cs.TunName = name
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}
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func (cs *ConnSession) RateLimit(byt int, isUp bool) error {
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if isUp {
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atomic.AddUint32(&cs.BandwidthUp, uint32(byt))
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return nil
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}
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// 只对下行速率限制
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atomic.AddUint32(&cs.BandwidthDown, uint32(byt))
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if cs.Limit == nil {
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return nil
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}
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return cs.Limit.Wait(byt)
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}
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func SToken2Sess(stoken string) *Session {
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stoken = strings.TrimSpace(stoken)
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sarr := strings.Split(stoken, "@")
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token := sarr[1]
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return Token2Sess(token)
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}
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func Token2Sess(token string) *Session {
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sessMux.Lock()
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defer sessMux.Unlock()
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return sessions[token]
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}
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func Dtls2Sess(dtlsid []byte) *Session {
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return nil
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}
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func DelSess(token string) {
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// sessions.Delete(token)
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}
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func CloseSess(token string) {
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sessMux.Lock()
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defer sessMux.Unlock()
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sess, ok := sessions[token]
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if !ok {
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return
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}
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delete(sessions, token)
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sess.CSess.Close()
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}
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func CloseCSess(token string) {
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sessMux.Lock()
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defer sessMux.Unlock()
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sess, ok := sessions[token]
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if !ok {
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return
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}
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sess.CSess.Close()
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}
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func DelSessByStoken(stoken string) {
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stoken = strings.TrimSpace(stoken)
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sarr := strings.Split(stoken, "@")
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token := sarr[1]
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sessMux.Lock()
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delete(sessions, token)
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sessMux.Unlock()
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}
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