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ovn_tcp_port.go
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ovn_tcp_port.go
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// Copyright 2018 Paul Greenberg (greenpau@outlook.com)
//
// 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 ovsdb
import (
"bufio"
"fmt"
//"github.com/davecgh/go-spew/spew"
"os"
"strconv"
"strings"
)
// IsDefaultPortUp returns the TCP port used for database connection.
// If the value if greater than 0, then the port is in LISTEN state.
func (cli *OvnClient) IsDefaultPortUp(db string) (int, error) {
var port int
var pid int
switch db {
case "ovsdb-server-northbound":
port = cli.Database.Northbound.Port.Default
pid = cli.Database.Northbound.Process.ID
case "ovsdb-server-southbound":
port = cli.Database.Southbound.Port.Default
pid = cli.Database.Southbound.Process.ID
default:
return 0, fmt.Errorf("The '%s' database is unsupported", db)
}
if !isPortUp(pid, port) {
port = 0
}
return port, nil
}
// IsDefaultPortUp returns the TCP port used for database connection.
// If the value if greater than 0, then the port is in LISTEN state.
func (cli *OvsClient) IsDefaultPortUp(db string) (int, error) {
var port int
var pid int
switch db {
case "ovsdb-server":
port = cli.Database.Vswitch.Port.Default
pid = cli.Database.Vswitch.Process.ID
default:
return 0, fmt.Errorf("The '%s' database is unsupported", db)
}
if !isPortUp(pid, port) {
port = 0
}
return port, nil
}
// IsSslPortUp returns the TCP port used for secure database connection.
// If the value if greater than 0, then the port is in LISTEN state.
func (cli *OvnClient) IsSslPortUp(db string) (int, error) {
var port int
var pid int
switch db {
case "ovsdb-server-northbound":
port = cli.Database.Northbound.Port.Ssl
pid = cli.Database.Northbound.Process.ID
case "ovsdb-server-southbound":
port = cli.Database.Southbound.Port.Ssl
pid = cli.Database.Southbound.Process.ID
default:
return 0, fmt.Errorf("The '%s' database is unsupported", db)
}
if !isPortUp(pid, port) {
port = 0
}
return port, nil
}
// IsSslPortUp returns the TCP port used for secure database connection.
// If the value if greater than 0, then the port is in LISTEN state.
func (cli *OvsClient) IsSslPortUp(db string) (int, error) {
var port int
var pid int
switch db {
case "ovsdb-server":
port = cli.Database.Vswitch.Port.Ssl
pid = cli.Database.Vswitch.Process.ID
default:
return 0, fmt.Errorf("The '%s' database is unsupported", db)
}
if !isPortUp(pid, port) {
port = 0
}
return port, nil
}
// IsRaftPortUp returns the TCP port used for clustering (raft).
// If the value if greater than 0, then the port is in LISTEN state.
func (cli *OvnClient) IsRaftPortUp(db string) (int, error) {
var port int
var pid int
switch db {
case "ovsdb-server-northbound":
port = cli.Database.Northbound.Port.Raft
pid = cli.Database.Northbound.Process.ID
case "ovsdb-server-southbound":
port = cli.Database.Southbound.Port.Raft
pid = cli.Database.Southbound.Process.ID
default:
return 0, fmt.Errorf("The '%s' database is unsupported", db)
}
if !isPortUp(pid, port) {
port = 0
}
return port, nil
}
func isPortUp(pid int, port int) bool {
if pid == 0 || port == 0 {
return false
}
localAddress := "00000000:" + strings.ToUpper(strconv.FormatInt(int64(port), 16))
f := "/proc/" + strconv.Itoa(pid) + "/net/tcp"
file, err := os.Open(f)
if err != nil {
return false
}
defer file.Close()
scanner := bufio.NewScanner(file)
for scanner.Scan() {
arr := strings.Fields(strings.TrimSpace(scanner.Text()))
if len(arr) < 10 {
continue
}
// State:
// - 0A means "LISTEN"
// - 01 means "ESTABLISHED"
// - 06 means "TIME_WAIT"
if arr[3] == "0A" && arr[1] == localAddress && arr[2] == "00000000:0000" {
return true
}
}
if err := scanner.Err(); err != nil {
return false
}
return false
}