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59 lines
1.9 KiB
Go
59 lines
1.9 KiB
Go
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//go:build linux
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// +build linux
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// Copyright (c) 2015-2023 MinIO, Inc.
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//
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// This file is part of MinIO Object Storage stack
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package http
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import (
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"context"
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"net"
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"syscall"
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"time"
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)
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// CheckPortAvailability - check if given host and port is already in use.
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// Note: The check method tries to listen on given port and closes it.
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// It is possible to have a disconnected client in this tiny window of time.
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func CheckPortAvailability(host, port string, opts TCPOptions) (err error) {
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lc := &net.ListenConfig{
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Control: func(network, address string, c syscall.RawConn) error {
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c.Control(func(fdPtr uintptr) {
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if opts.Interface != "" {
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// When interface is specified look for specifically port availability on
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// the specified interface if any.
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_ = syscall.SetsockoptString(int(fdPtr), syscall.SOL_SOCKET, syscall.SO_BINDTODEVICE, opts.Interface)
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}
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})
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return nil
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},
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}
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ctx, cancel := context.WithTimeout(context.Background(), time.Second)
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defer cancel()
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l, err := lc.Listen(ctx, "tcp", net.JoinHostPort(host, port))
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if err != nil {
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return err
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}
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// As we are able to listen on this network, the port is not in use.
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// Close the listener and continue check other networks.
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return l.Close()
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}
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