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https://github.com/k3s-io/kubernetes.git
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79 lines
1.7 KiB
Go
79 lines
1.7 KiB
Go
/*
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Copyright 2020 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 main connects to the given host and port and redirects its stdin to the connection and
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// the connection's output to stdout. This is currently being used for port-forwarding for Windows Pods.
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package main
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import (
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"fmt"
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"io"
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"log"
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"net"
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"os"
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"sync"
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)
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func main() {
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if len(os.Args) != 3 {
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log.Fatalln("usage: wincat <host> <port>")
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}
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host := os.Args[1]
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port := os.Args[2]
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addr, err := net.ResolveTCPAddr("tcp", fmt.Sprintf("%s:%s", host, port))
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if err != nil {
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log.Fatalf("Failed to resolve TCP addr %v %v", host, port)
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}
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conn, err := net.DialTCP("tcp", nil, addr)
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if err != nil {
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log.Fatalf("Failed to connect to %s:%s because %s", host, port, err)
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}
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defer conn.Close()
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var wg sync.WaitGroup
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wg.Add(2)
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go func() {
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defer func() {
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os.Stdout.Close()
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os.Stdin.Close()
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conn.CloseRead()
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wg.Done()
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}()
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_, err := io.Copy(os.Stdout, conn)
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if err != nil {
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log.Printf("error while copying stream to stdout: %v", err)
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}
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}()
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go func() {
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defer func() {
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conn.CloseWrite()
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wg.Done()
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}()
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_, err := io.Copy(conn, os.Stdin)
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if err != nil {
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log.Printf("error while copying stream from stdin: %v", err)
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}
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}()
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wg.Wait()
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}
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