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// Copyright (C) 2015 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 (
"bufio"
"bytes"
"fmt"
"github.com/armon/go-radix"
"github.com/osrg/gobgp/api"
"github.com/osrg/gobgp/config"
"github.com/osrg/gobgp/packet"
"github.com/osrg/gobgp/table"
"net"
)
type roa struct {
AS uint32
PrefixLen uint8
MaxLen uint8
Prefix net.IP
}
func (r *roa) key() string {
return fmt.Sprintf("%s/%d", r.Prefix.String(), r.PrefixLen)
}
func (r *roa) toApiStruct() *api.ROA {
return &api.ROA{
As: r.AS,
Prefixlen: uint32(r.PrefixLen),
Maxlen: uint32(r.MaxLen),
Prefix: r.Prefix.String(),
}
}
type roaClient struct {
url string
roas map[bgp.RouteFamily]*radix.Tree
outgoing chan *roa
}
func (c *roaClient) recieveROA() chan *roa {
return c.outgoing
}
func roa2key(r *roa) string {
var buffer bytes.Buffer
for i := 0; i < len(r.Prefix) && i < int(r.PrefixLen); i++ {
buffer.WriteString(fmt.Sprintf("%08b", r.Prefix[i]))
}
return buffer.String()[:r.PrefixLen]
}
func (c *roaClient) handleRTRMsg(r *roa) {
if r.Prefix.To4() != nil {
c.roas[bgp.RF_IPv4_UC].Insert(roa2key(r), r)
} else {
c.roas[bgp.RF_IPv6_UC].Insert(roa2key(r), r)
}
}
func (c *roaClient) handleGRPC(grpcReq *GrpcRequest) {
if tree, ok := c.roas[grpcReq.RouteFamily]; ok {
results := make([]*GrpcResponse, 0)
tree.Walk(func(s string, v interface{}) bool {
r, _ := v.(*roa)
result := &GrpcResponse{}
result.Data = r.toApiStruct()
results = append(results, result)
return false
})
go sendMultipleResponses(grpcReq, results)
}
}
func (c *roaClient) validate(pathList []*table.Path) {
if c.url == "" {
return
}
for _, path := range pathList {
if tree, ok := c.roas[path.GetRouteFamily()]; ok {
_, n, _ := net.ParseCIDR(path.GetNlri().String())
ones, _ := n.Mask.Size()
var buffer bytes.Buffer
for i := 0; i < len(n.IP) && i < ones; i++ {
buffer.WriteString(fmt.Sprintf("%08b", n.IP[i]))
}
_, r, _ := tree.LongestPrefix(buffer.String()[:ones])
if r == nil {
path.Validation = config.RPKI_VALIDATION_RESULT_TYPE_NOT_FOUND
} else {
roa, _ := r.(*roa)
if roa.AS == path.GetSourceAs() {
path.Validation = config.RPKI_VALIDATION_RESULT_TYPE_VALID
} else {
path.Validation = config.RPKI_VALIDATION_RESULT_TYPE_INVALID
}
}
}
}
}
func newROAClient(url string) (*roaClient, error) {
c := &roaClient{
url: url,
roas: make(map[bgp.RouteFamily]*radix.Tree),
}
c.roas[bgp.RF_IPv4_UC] = radix.New()
c.roas[bgp.RF_IPv6_UC] = radix.New()
if url == "" {
return c, nil
}
conn, err := net.Dial("tcp", url)
if err != nil {
return c, err
}
r := bgp.NewRTRResetQuery()
data, _ := r.Serialize()
conn.Write(data)
reader := bufio.NewReader(conn)
scanner := bufio.NewScanner(reader)
scanner.Split(bgp.SplitRTR)
ch := make(chan *roa)
c.outgoing = ch
go func(ch chan *roa) {
for scanner.Scan() {
m, _ := bgp.ParseRTR(scanner.Bytes())
if m != nil {
switch msg := m.(type) {
case *bgp.RTRIPPrefix:
p := make([]byte, len(msg.Prefix))
copy(p, msg.Prefix)
ch <- &roa{
AS: msg.AS,
PrefixLen: msg.PrefixLen,
MaxLen: msg.MaxLen,
Prefix: p,
}
}
}
}
}(ch)
return c, nil
}
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