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// Copyright (C) 2014 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 (
"encoding/json"
"fmt"
log "github.com/Sirupsen/logrus"
"github.com/osrg/gobgp/api"
"github.com/osrg/gobgp/config"
"net"
"os"
"strconv"
"strings"
)
const (
_ = iota
PEER_MSG_NEW
PEER_MSG_PATH
PEER_MSG_DOWN
PEER_MSG_REST //hacky, fix later
)
type message struct {
src string
dst string
event int
data interface{}
}
type BgpServer struct {
bgpConfig config.BgpType
globalTypeCh chan config.GlobalType
addedPeerCh chan config.NeighborType
deletedPeerCh chan config.NeighborType
RestReqCh chan *api.RestRequest
listenPort int
peerMap map[string]*Peer
}
func NewBgpServer(port int) *BgpServer {
b := BgpServer{}
b.globalTypeCh = make(chan config.GlobalType)
b.addedPeerCh = make(chan config.NeighborType)
b.deletedPeerCh = make(chan config.NeighborType)
b.RestReqCh = make(chan *api.RestRequest, 1)
b.listenPort = port
return &b
}
// avoid mapped IPv6 address
func listenAndAccept(proto string, port int, ch chan *net.TCPConn) (*net.TCPListener, error) {
service := ":" + strconv.Itoa(port)
addr, _ := net.ResolveTCPAddr(proto, service)
l, err := net.ListenTCP(proto, addr)
if err != nil {
log.Info(err)
return nil, err
}
go func() {
for {
conn, err := l.AcceptTCP()
if err != nil {
log.Info(err)
continue
}
ch <- conn
}
}()
return l, nil
}
func (server *BgpServer) Serve() {
server.bgpConfig.Global = <-server.globalTypeCh
listenerMap := make(map[string]*net.TCPListener)
acceptCh := make(chan *net.TCPConn)
l4, err1 := listenAndAccept("tcp4", server.listenPort, acceptCh)
listenerMap["tcp4"] = l4
l6, err2 := listenAndAccept("tcp6", server.listenPort, acceptCh)
listenerMap["tcp6"] = l6
if err1 != nil && err2 != nil {
log.Fatal("can't listen either v4 and v6")
os.Exit(1)
}
listenFile := func(addr net.IP) *os.File {
var l *net.TCPListener
if addr.To4() != nil {
l = listenerMap["tcp4"]
} else {
l = listenerMap["tcp6"]
}
f, _ := l.File()
return f
}
server.peerMap = make(map[string]*Peer)
broadcastCh := make(chan *message)
for {
select {
case conn := <-acceptCh:
remoteAddr := func(addrPort string) string {
if strings.Index(addrPort, "[") == -1 {
return strings.Split(addrPort, ":")[0]
}
idx := strings.LastIndex(addrPort, ":")
return addrPort[1 : idx-1]
}(conn.RemoteAddr().String())
peer, found := server.peerMap[remoteAddr]
if found {
log.Info("accepted a new passive connection from ", remoteAddr)
peer.PassConn(conn)
} else {
log.Info("can't find configuration for a new passive connection from ", remoteAddr)
conn.Close()
}
case peer := <-server.addedPeerCh:
addr := peer.NeighborAddress.String()
f := listenFile(peer.NeighborAddress)
SetTcpMD5SigSockopts(int(f.Fd()), addr, peer.AuthPassword)
p := NewPeer(server.bgpConfig.Global, peer, broadcastCh)
server.peerMap[peer.NeighborAddress.String()] = p
case peer := <-server.deletedPeerCh:
addr := peer.NeighborAddress.String()
f := listenFile(peer.NeighborAddress)
SetTcpMD5SigSockopts(int(f.Fd()), addr, "")
p, found := server.peerMap[addr]
if found {
log.Info("Delete a peer configuration for ", addr)
p.Stop()
delete(server.peerMap, addr)
} else {
log.Info("Can't delete a peer configuration for ", addr)
}
case restReq := <-server.RestReqCh:
server.handleRest(restReq)
case msg := <-broadcastCh:
server.broadcast(msg)
}
}
}
func (server *BgpServer) SetGlobalType(g config.GlobalType) {
server.globalTypeCh <- g
}
func (server *BgpServer) PeerAdd(peer config.NeighborType) {
server.addedPeerCh <- peer
}
func (server *BgpServer) PeerDelete(peer config.NeighborType) {
server.deletedPeerCh <- peer
}
func (server *BgpServer) broadcast(msg *message) {
for key := range server.peerMap {
if key == msg.src {
continue
}
if msg.dst == "" || msg.dst == key {
peer := server.peerMap[key]
peer.SendMessage(msg)
}
}
}
func (server *BgpServer) handleRest(restReq *api.RestRequest) {
switch restReq.RequestType {
case api.REQ_NEIGHBORS:
result := &api.RestResponse{}
peerList := make([]*Peer, 0)
for _, peer := range server.peerMap {
peerList = append(peerList, peer)
}
j, _ := json.Marshal(peerList)
result.Data = j
restReq.ResponseCh <- result
close(restReq.ResponseCh)
case api.REQ_NEIGHBOR: // get neighbor state
remoteAddr := restReq.RemoteAddr
result := &api.RestResponse{}
peer, found := server.peerMap[remoteAddr]
if found {
j, _ := json.Marshal(peer)
result.Data = j
} else {
result.ResponseErr = fmt.Errorf("Neighbor that has %v does not exist.", remoteAddr)
}
restReq.ResponseCh <- result
close(restReq.ResponseCh)
case api.REQ_LOCAL_RIB:
remoteAddr := restReq.RemoteAddr
result := &api.RestResponse{}
peer, found := server.peerMap[remoteAddr]
if found {
msg := message{
event: PEER_MSG_REST,
data: restReq,
}
peer.SendMessage(&msg)
} else {
result.ResponseErr = fmt.Errorf("Neighbor that has %v does not exist.", remoteAddr)
restReq.ResponseCh <- result
close(restReq.ResponseCh)
}
}
}
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