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94 lines
2.6 KiB
94 lines
2.6 KiB
![]()
8 years ago
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/*
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* Minio Cloud Storage, (C) 2016 Minio, Inc.
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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 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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*/
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package main
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import (
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"errors"
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"net"
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"os"
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"syscall"
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)
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// Make sure that none of the other processes are listening on the
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// specified port on any of the interfaces.
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//
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// On linux if a process is listening on 127.0.0.1:9000 then Listen()
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// on ":9000" fails with the error "port already in use".
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// However on Mac OSX Listen() on ":9000" falls back to the IPv6 address.
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// This causes confusion on Mac OSX that minio server is not reachable
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// on 127.0.0.1 even though minio server is running. So before we start
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// the minio server we make sure that the port is free on all the IPs.
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func checkPortAvailability(port int) {
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isAddrInUse := func(err error) bool {
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// Check if the syscall error is EADDRINUSE.
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// EADDRINUSE is the system call error if another process is
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// already listening at the specified port.
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neterr, ok := err.(*net.OpError)
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if !ok {
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return false
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}
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osErr, ok := neterr.Err.(*os.SyscallError)
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if !ok {
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return false
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}
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sysErr, ok := osErr.Err.(syscall.Errno)
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if !ok {
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return false
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}
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if sysErr != syscall.EADDRINUSE {
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return false
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}
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return true
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}
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ifcs, err := net.Interfaces()
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if err != nil {
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fatalIf(err, "Unable to list interfaces.")
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}
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for _, ifc := range ifcs {
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addrs, err := ifc.Addrs()
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if err != nil {
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fatalIf(err, "Unable to list addresses on interface %s.", ifc.Name)
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}
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for _, addr := range addrs {
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ipnet, ok := addr.(*net.IPNet)
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if !ok {
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errorIf(errors.New(""), "Failed to assert type on (*net.IPNet) interface.")
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continue
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}
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ip := ipnet.IP
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network := "tcp4"
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if ip.To4() == nil {
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network = "tcp6"
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}
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tcpAddr := net.TCPAddr{IP: ip, Port: port, Zone: ifc.Name}
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l, err := net.ListenTCP(network, &tcpAddr)
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if err != nil {
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if isAddrInUse(err) {
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// Fail if port is already in use.
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fatalIf(err, "Unable to listen on %s:%.d.", tcpAddr.IP, tcpAddr.Port)
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} else {
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// Ignore other errors.
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continue
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}
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}
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if err = l.Close(); err != nil {
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fatalIf(err, "Unable to close listener on %s:%.d.", tcpAddr.IP, tcpAddr.Port)
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}
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}
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}
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}
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