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43 lines
1.4 KiB
Go
43 lines
1.4 KiB
Go
//go:build !windows
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// +build !windows
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/*
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Copyright 2023 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 probe
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import (
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"net"
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"syscall"
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)
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// ProbeDialer returns a dialer optimized for probes to avoid lingering sockets on TIME-WAIT state.
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// The dialer reduces the TIME-WAIT period to 1 seconds instead of the OS default of 60 seconds.
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// Using 1 second instead of 0 because SO_LINGER socket option to 0 causes pending data to be
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// discarded and the connection to be aborted with an RST rather than for the pending data to be
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// transmitted and the connection closed cleanly with a FIN.
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// Ref: https://issues.k8s.io/89898
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func ProbeDialer() *net.Dialer {
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dialer := &net.Dialer{
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Control: func(network, address string, c syscall.RawConn) error {
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return c.Control(func(fd uintptr) {
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syscall.SetsockoptLinger(int(fd), syscall.SOL_SOCKET, syscall.SO_LINGER, &syscall.Linger{Onoff: 1, Linger: 1})
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})
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},
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}
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return dialer
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}
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