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// Copyright (C) 2015-2016 Nippon Telegraph and Telephone Corporation.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package server
import (
"fmt"
log "github.com/Sirupsen/logrus"
"github.com/osrg/gobgp/config"
"github.com/osrg/gobgp/packet/bgp"
"github.com/osrg/gobgp/packet/bmp"
"github.com/osrg/gobgp/table"
"net"
"strconv"
"time"
)
func (b *bmpClient) tryConnect() *net.TCPConn {
interval := 1
for {
log.Debug("connecting bmp server: ", b.host)
conn, err := net.Dial("tcp", b.host)
if err != nil {
select {
case <-b.dead:
return nil
default:
}
time.Sleep(time.Duration(interval) * time.Second)
if interval < 30 {
interval *= 2
}
} else {
log.Info("bmp server is connected, ", b.host)
return conn.(*net.TCPConn)
}
}
}
func (b *bmpClient) Stop() {
close(b.dead)
}
func (b *bmpClient) loop() {
for {
conn := b.tryConnect()
if conn == nil {
break
}
if func() bool {
ops := []WatchOption{WatchPeerState(true)}
if b.typ != config.BMP_ROUTE_MONITORING_POLICY_TYPE_POST_POLICY {
ops = append(ops, WatchUpdate(true))
} else if b.typ != config.BMP_ROUTE_MONITORING_POLICY_TYPE_PRE_POLICY {
ops = append(ops, WatchPostUpdate(true))
}
w := b.s.Watch(ops...)
defer w.Stop()
write := func(msg *bmp.BMPMessage) error {
buf, _ := msg.Serialize()
_, err := conn.Write(buf)
if err != nil {
log.Warnf("failed to write to bmp server %s", b.host)
}
return err
}
if err := write(bmp.NewBMPInitiation([]bmp.BMPTLV{})); err != nil {
return false
}
for {
select {
case ev := <-w.Event():
switch msg := ev.(type) {
case *watcherEventUpdateMsg:
info := &table.PeerInfo{
Address: msg.peerAddress,
AS: msg.peerAS,
ID: msg.peerID,
}
if err := write(bmpPeerRoute(bmp.BMP_PEER_TYPE_GLOBAL, msg.postPolicy, 0, info, msg.timestamp.Unix(), msg.payload)); err != nil {
return false
}
case *watcherEventStateChangedMsg:
info := &table.PeerInfo{
Address: msg.peerAddress,
AS: msg.peerAS,
ID: msg.peerID,
}
if msg.state == bgp.BGP_FSM_ESTABLISHED {
if err := write(bmpPeerUp(msg.localAddress.String(), msg.localPort, msg.peerPort, msg.sentOpen, msg.recvOpen, bmp.BMP_PEER_TYPE_GLOBAL, false, 0, info, msg.timestamp.Unix())); err != nil {
return false
}
} else {
if err := write(bmpPeerDown(bmp.BMP_PEER_DOWN_REASON_UNKNOWN, bmp.BMP_PEER_TYPE_GLOBAL, false, 0, info, msg.timestamp.Unix())); err != nil {
return false
}
}
}
case <-b.dead:
conn.Close()
return true
}
}
}() {
return
}
}
}
type bmpClient struct {
s *BgpServer
dead chan struct{}
host string
typ config.BmpRouteMonitoringPolicyType
}
func bmpPeerUp(laddr string, lport, rport uint16, sent, recv *bgp.BGPMessage, t uint8, policy bool, pd uint64, peeri *table.PeerInfo, timestamp int64) *bmp.BMPMessage {
ph := bmp.NewBMPPeerHeader(t, policy, pd, peeri.Address.String(), peeri.AS, peeri.ID.String(), float64(timestamp))
return bmp.NewBMPPeerUpNotification(*ph, laddr, lport, rport, sent, recv)
}
func bmpPeerDown(reason uint8, t uint8, policy bool, pd uint64, peeri *table.PeerInfo, timestamp int64) *bmp.BMPMessage {
ph := bmp.NewBMPPeerHeader(t, policy, pd, peeri.Address.String(), peeri.AS, peeri.ID.String(), float64(timestamp))
return bmp.NewBMPPeerDownNotification(*ph, reason, nil, []byte{})
}
func bmpPeerRoute(t uint8, policy bool, pd uint64, peeri *table.PeerInfo, timestamp int64, payload []byte) *bmp.BMPMessage {
ph := bmp.NewBMPPeerHeader(t, policy, pd, peeri.Address.String(), peeri.AS, peeri.ID.String(), float64(timestamp))
m := bmp.NewBMPRouteMonitoring(*ph, nil)
body := m.Body.(*bmp.BMPRouteMonitoring)
body.BGPUpdatePayload = payload
return m
}
func (b *bmpClientManager) addServer(c *config.BmpServerConfig) error {
host := net.JoinHostPort(c.Address, strconv.Itoa(int(c.Port)))
if _, y := b.clientMap[host]; y {
return fmt.Errorf("bmp client %s is already configured", host)
}
b.clientMap[host] = &bmpClient{
s: b.s,
dead: make(chan struct{}),
host: host,
typ: c.RouteMonitoringPolicy,
}
go b.clientMap[host].loop()
return nil
}
func (b *bmpClientManager) deleteServer(c *config.BmpServerConfig) error {
host := net.JoinHostPort(c.Address, strconv.Itoa(int(c.Port)))
if c, y := b.clientMap[host]; !y {
return fmt.Errorf("bmp client %s isn't found", host)
} else {
c.Stop()
delete(b.clientMap, host)
}
return nil
}
type bmpClientManager struct {
s *BgpServer
clientMap map[string]*bmpClient
}
func newBmpClientManager(s *BgpServer) *bmpClientManager {
return &bmpClientManager{
s: s,
clientMap: make(map[string]*bmpClient),
}
}
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