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7c27cf0b9b
We don't need to parse out the counter values from the iptables-save output (since they are always 0 for the chains we care about). Just parse the chain names themselves. Also, all of the callers of GetChainLines() pass it input that contains only a single table, so just assume that, rather than carefully parsing only a single table's worth of the input.
53 lines
1.4 KiB
Go
53 lines
1.4 KiB
Go
/*
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Copyright 2014 The Kubernetes Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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 iptables
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import (
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"bytes"
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"fmt"
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)
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// MakeChainLine return an iptables-save/restore formatted chain line given a Chain
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func MakeChainLine(chain Chain) string {
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return fmt.Sprintf(":%s - [0:0]", chain)
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}
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// GetChainsFromTable parses iptables-save data to find the chains that are defined. It
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// assumes that save contains a single table's data, and returns a map with keys for every
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// chain defined in that table.
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func GetChainsFromTable(save []byte) map[Chain]struct{} {
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chainsMap := make(map[Chain]struct{})
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for {
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i := bytes.Index(save, []byte("\n:"))
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if i == -1 {
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break
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}
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start := i + 2
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save = save[start:]
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end := bytes.Index(save, []byte(" "))
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if i == -1 {
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// shouldn't happen, but...
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break
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}
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chain := Chain(save[:end])
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chainsMap[chain] = struct{}{}
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save = save[end:]
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}
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return chainsMap
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}
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