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// Copyright (C) 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 (
"net"
"os"
"strings"
"syscall"
"github.com/eapache/channels"
"github.com/osrg/gobgp/packet/bgp"
)
func cleanInfiniteChannel(ch *channels.InfiniteChannel) {
ch.Close()
// drain all remaining items
for range ch.Out() {
}
}
// Returns the binary formatted Administrative Shutdown Communication from the
// given string value.
func newAdministrativeCommunication(communication string) (data []byte) {
if communication == "" {
return nil
}
com := []byte(communication)
if len(com) > bgp.BGP_ERROR_ADMINISTRATIVE_COMMUNICATION_MAX {
data = []byte{bgp.BGP_ERROR_ADMINISTRATIVE_COMMUNICATION_MAX}
data = append(data, com[:bgp.BGP_ERROR_ADMINISTRATIVE_COMMUNICATION_MAX]...)
} else {
data = []byte{byte(len(com))}
data = append(data, com...)
}
return data
}
// Parses the given NOTIFICATION message data as a binary value and returns
// the Administrative Shutdown Communication in string and the rest binary.
func decodeAdministrativeCommunication(data []byte) (string, []byte) {
if len(data) == 0 {
return "", data
}
communicationLen := int(data[0])
if communicationLen > bgp.BGP_ERROR_ADMINISTRATIVE_COMMUNICATION_MAX {
communicationLen = bgp.BGP_ERROR_ADMINISTRATIVE_COMMUNICATION_MAX
}
if communicationLen > len(data)+1 {
communicationLen = len(data) + 1
}
return string(data[1 : communicationLen+1]), data[communicationLen+1:]
}
func extractFileAndFamilyFromTCPConn(conn *net.TCPConn) (*os.File, int, error) {
// Note #1: TCPConn.File() has the unexpected side-effect of putting
// the original socket into blocking mode. See Note #2.
fi, err := conn.File()
if err != nil {
return nil, 0, err
}
// Note #2: Call net.FileConn() to put the original socket back into
// non-blocking mode.
fc, err := net.FileConn(fi)
if err != nil {
fi.Close()
return nil, 0, err
}
fc.Close()
family := syscall.AF_INET
if strings.Contains(conn.RemoteAddr().String(), "[") {
family = syscall.AF_INET6
}
return fi, family, nil
}
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