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47 lines
1.8 KiB
Go
47 lines
1.8 KiB
Go
// Copyright 2023 CNI authors
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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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package utils
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import (
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"github.com/coreos/go-iptables/iptables"
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"sigs.k8s.io/knftables"
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)
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// SupportsIPTables tests whether the system supports using netfilter via the iptables API
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// (whether via "iptables-legacy" or "iptables-nft"). (Note that this returns true if it
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// is *possible* to use iptables; it does not test whether any other components on the
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// system are *actually* using iptables.)
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func SupportsIPTables() bool {
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ipt, err := iptables.NewWithProtocol(iptables.ProtocolIPv4)
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if err != nil {
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return false
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}
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// We don't care whether the chain actually exists, only whether we can *check*
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// whether it exists.
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_, err = ipt.ChainExists("filter", "INPUT")
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return err == nil
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}
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// SupportsNFTables tests whether the system supports using netfilter via the nftables API
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// (ie, not via "iptables-nft"). (Note that this returns true if it is *possible* to use
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// nftables; it does not test whether any other components on the system are *actually*
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// using nftables.)
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func SupportsNFTables() bool {
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// knftables.New() does sanity checks so we don't need any further test like in
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// the iptables case.
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_, err := knftables.New(knftables.IPv4Family, "supports_nftables_test")
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return err == nil
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}
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