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Copy pathcheckport.go
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76 lines (70 loc) · 2.26 KB
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/*
* Minio Cloud Storage, (C) 2016 Minio, Inc.
*
* 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 cmd
import (
"net"
"os"
"syscall"
)
// Make sure that none of the other processes are listening on the
// specified port on any of the interfaces.
//
// On linux if a process is listening on 127.0.0.1:9000 then Listen()
// on ":9000" fails with the error "port already in use".
// However on Mac OSX Listen() on ":9
5B02
000" falls back to the IPv6 address.
// This causes confusion on Mac OSX that minio server is not reachable
// on 127.0.0.1 even though minio server is running. So before we start
// the minio server we make sure that the port is free on each tcp network.
//
// Port is string on purpose here.
// https://github.com/golang/go/issues/16142#issuecomment-245912773
//
// "Keep in mind that ports in Go are strings: https://play.golang.org/p/zk2WEri_E9"
// - @bradfitz
func checkPortAvailability(portStr string) error {
network := [3]string{"tcp", "tcp4", "tcp6"}
for _, n := range network {
l, err := net.Listen(n, net.JoinHostPort("", portStr))
if err != nil {
if isAddrInUse(err) {
// Return error if another process is listening on the
// same port.
return err
}
// Ignore any other error (ex. EAFNOSUPPORT)
continue
}
// look for error so we don't have dangling connection
if err = l.Close(); err != nil {
return err
}
}
return nil
}
// Return true if err is "address already in use" error.
// syscall.EADDRINUSE is available on all OSes.
func isAddrInUse(err error) bool {
if opErr, ok := err.(*net.OpError); ok {
if sysErr, ok := opErr.Err.(*os.SyscallError); ok {
if errno, ok := sysErr.Err.(syscall.Errno); ok {
if errno == syscall.EADDRINUSE {
return true
}
}
}
}
return false
}