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// +build linux
// Copyright 2016 CNI authors
//
// 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 firewall
import (
"fmt"
)
// GetBackend retrieves a firewall backend for adding or removing firewall rules
// on the system.
// Valid backend names are firewalld, iptables, and none.
// If the empty string is given, a firewalld backend will be returned if
// firewalld is running, and an iptables backend will be returned otherwise.
func GetBackend(backend string) (FirewallBackend, error) {
switch backend {
case "firewalld":
return newFirewalldBackend()
case "iptables":
return newIptablesBackend()
case "none":
return newNoneBackend()
case "":
// Default to firewalld if it's running
if isFirewalldRunning() {
return newFirewalldBackend()
}
// Otherwise iptables
return newIptablesBackend()
default:
return nil, fmt.Errorf("unrecognized firewall backend %q", backend)
}
}
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