add configurable VRF interface and user-timeout (#17108)

internal/http/check_port_others.go

@@ -0,0 +1,46 @@
+//go:build !linux
+// +build !linux
+
+// Copyright (c) 2015-2023 MinIO, Inc.
+//
+// This file is part of MinIO Object Storage stack
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package http
+
+import (
+	"context"
+	"net"
+	"time"
+)
+
+// CheckPortAvailability - check if given host and port is already in use.
+// Note: The check method tries to listen on given port and closes it.
+// It is possible to have a disconnected client in this tiny window of time.
+func CheckPortAvailability(host, port string, opts TCPOptions) (err error) {
+	lc := &net.ListenConfig{}
+
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second)
+	defer cancel()
+
+	l, err := lc.Listen(ctx, "tcp", net.JoinHostPort(host, port))
+	if err != nil {
+		return err
+	}
+
+	// As we are able to listen on this network, the port is not in use.
+	// Close the listener and continue check other networks.
+	return l.Close()
+}