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9e75203598
* Use libnetwork/ipvs alternative * PR image tag simplification * Remove nested vendor directories
118 lines
3.2 KiB
Go
118 lines
3.2 KiB
Go
// Copyright (C) 2016 Nippon Telegraph and Telephone Corporation.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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// implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package server
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import (
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"net"
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"os"
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"strings"
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"syscall"
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"github.com/eapache/channels"
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"github.com/osrg/gobgp/packet/bgp"
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)
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func cleanInfiniteChannel(ch *channels.InfiniteChannel) {
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ch.Close()
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// drain all remaining items
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for range ch.Out() {
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}
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}
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// Returns the binary formatted Administrative Shutdown Communication from the
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// given string value.
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func newAdministrativeCommunication(communication string) (data []byte) {
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if communication == "" {
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return nil
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}
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com := []byte(communication)
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if len(com) > bgp.BGP_ERROR_ADMINISTRATIVE_COMMUNICATION_MAX {
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data = []byte{bgp.BGP_ERROR_ADMINISTRATIVE_COMMUNICATION_MAX}
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data = append(data, com[:bgp.BGP_ERROR_ADMINISTRATIVE_COMMUNICATION_MAX]...)
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} else {
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data = []byte{byte(len(com))}
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data = append(data, com...)
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}
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return data
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}
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// Parses the given NOTIFICATION message data as a binary value and returns
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// the Administrative Shutdown Communication in string and the rest binary.
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func decodeAdministrativeCommunication(data []byte) (string, []byte) {
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if len(data) == 0 {
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return "", data
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}
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communicationLen := int(data[0])
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if communicationLen > bgp.BGP_ERROR_ADMINISTRATIVE_COMMUNICATION_MAX {
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communicationLen = bgp.BGP_ERROR_ADMINISTRATIVE_COMMUNICATION_MAX
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}
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if communicationLen > len(data)+1 {
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communicationLen = len(data) + 1
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}
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return string(data[1 : communicationLen+1]), data[communicationLen+1:]
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}
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func extractFileAndFamilyFromTCPListener(l *net.TCPListener) (*os.File, int, error) {
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// Note #1: TCPListener.File() has the unexpected side-effect of putting
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// the original socket into blocking mode. See Note #2.
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fi, err := l.File()
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if err != nil {
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return nil, 0, err
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}
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// Note #2: Call net.FileListener() to put the original socket back into
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// non-blocking mode.
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fl, err := net.FileListener(fi)
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if err != nil {
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fi.Close()
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return nil, 0, err
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}
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fl.Close()
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family := syscall.AF_INET
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if strings.Contains(l.Addr().String(), "[") {
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family = syscall.AF_INET6
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}
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return fi, family, nil
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}
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func extractFileAndFamilyFromTCPConn(conn *net.TCPConn) (*os.File, int, error) {
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// Note #1: TCPConn.File() has the unexpected side-effect of putting
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// the original socket into blocking mode. See Note #2.
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fi, err := conn.File()
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if err != nil {
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return nil, 0, err
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}
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// Note #2: Call net.FileConn() to put the original socket back into
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// non-blocking mode.
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fc, err := net.FileConn(fi)
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if err != nil {
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fi.Close()
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return nil, 0, err
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}
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fc.Close()
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family := syscall.AF_INET
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if strings.Contains(conn.RemoteAddr().String(), "[") {
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family = syscall.AF_INET6
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}
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return fi, family, nil
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}
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