43 lines
1.5 KiB
Go
43 lines
1.5 KiB
Go
// Copyright 2015 CoreOS, Inc.
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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 netutil
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import (
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"fmt"
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"os/exec"
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)
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// DropPort drops all tcp packets that are received from the given port and sent to the given port.
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func DropPort(port int) error {
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cmdStr := fmt.Sprintf("sudo iptables -A OUTPUT -p tcp --destination-port %d -j DROP", port)
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if _, err := exec.Command("/bin/sh", "-c", cmdStr).Output(); err != nil {
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return err
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}
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cmdStr = fmt.Sprintf("sudo iptables -A INPUT -p tcp --destination-port %d -j DROP", port)
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_, err := exec.Command("/bin/sh", "-c", cmdStr).Output()
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return err
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}
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// RecoverPort stops dropping tcp packets at given port.
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func RecoverPort(port int) error {
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cmdStr := fmt.Sprintf("sudo iptables -D OUTPUT -p tcp --destination-port %d -j DROP", port)
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if _, err := exec.Command("/bin/sh", "-c", cmdStr).Output(); err != nil {
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return err
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}
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cmdStr = fmt.Sprintf("sudo iptables -D INPUT -p tcp --destination-port %d -j DROP", port)
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_, err := exec.Command("/bin/sh", "-c", cmdStr).Output()
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return err
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}
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