mirror of
https://github.com/gravitational/teleport.git
synced 2026-09-19 11:00:37 +08:00
97 lines
2.5 KiB
Go
97 lines
2.5 KiB
Go
/*
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* Teleport
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* Copyright (C) 2023 Gravitational, Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package utils
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import (
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"context"
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"io"
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"os"
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"github.com/gravitational/trace"
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)
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// CombinedStdio reads from standard input and writes to standard output.
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// Closing a CombinedStdio does nothing, successfully.
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type CombinedStdio struct{}
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// Read reads from [os.Stdin].
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func (CombinedStdio) Read(p []byte) (int, error) {
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return os.Stdin.Read(p)
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}
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// Write writes to [os.Stdout].
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func (CombinedStdio) Write(p []byte) (int, error) {
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return os.Stdout.Write(p)
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}
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// ReadFrom copies data from [os.Stdout] to the provided [io.Reader].
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func (CombinedStdio) ReadFrom(r io.Reader) (n int64, err error) {
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return os.Stdout.ReadFrom(r)
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}
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// WriteTo copies data from [os.Stdin] to the provided [io.Writer].
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func (CombinedStdio) WriteTo(w io.Writer) (n int64, err error) {
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return os.Stdin.WriteTo(w)
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}
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func (CombinedStdio) Close() error {
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return nil
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}
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// ProxyConn launches a double-copy loop that proxies traffic between the
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// provided client and server connections.
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//
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// Exits when one or both copies stop, or when the context is canceled, and
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// closes both connections.
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func ProxyConn(ctx context.Context, client, server io.ReadWriteCloser) error {
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errCh := make(chan error, 2)
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defer server.Close()
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defer client.Close()
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go func() {
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defer server.Close()
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defer client.Close()
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_, err := io.Copy(server, client)
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errCh <- err
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}()
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go func() {
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defer server.Close()
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defer client.Close()
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_, err := io.Copy(client, server)
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errCh <- err
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}()
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var errors []error
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for range 2 {
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select {
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case err := <-errCh:
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if err != nil && !IsOKNetworkError(err) {
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errors = append(errors, err)
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}
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case <-ctx.Done():
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// Cause(ctx) returns ctx.Err() if no cause is provided.
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return trace.Wrap(context.Cause(ctx))
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}
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}
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return trace.NewAggregate(errors...)
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}
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