mirror of
https://github.com/gravitational/teleport.git
synced 2026-09-24 16:17:11 +08:00
68 lines
1.9 KiB
Go
68 lines
1.9 KiB
Go
// Copyright 2022 Gravitational, 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 sshutils
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import (
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"context"
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"github.com/gravitational/trace"
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"golang.org/x/crypto/ssh"
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)
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// RequestForwarder represents a resource capable of sending
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// an ssh request such as an ssh.Channel or ssh.Session.
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type RequestForwarder interface {
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SendRequest(name string, wantReply bool, payload []byte) (bool, error)
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}
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// ForwardRequest is a helper for forwarding a request across a session or channel.
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func ForwardRequest(sender RequestForwarder, req *ssh.Request) (bool, error) {
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reply, err := sender.SendRequest(req.Type, req.WantReply, req.Payload)
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if err != nil || !req.WantReply {
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return reply, trace.Wrap(err)
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}
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return reply, trace.Wrap(req.Reply(reply, nil))
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}
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// ForwardRequests forwards all ssh requests received from the
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// given channel until the channel or context is closed.
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func ForwardRequests(ctx context.Context, sin <-chan *ssh.Request, sender RequestForwarder) error {
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for {
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select {
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case sreq, ok := <-sin:
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if !ok {
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// channel closed, stop processing
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return nil
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}
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switch sreq.Type {
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case WindowChangeRequest:
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if _, err := ForwardRequest(sender, sreq); err != nil {
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return trace.Wrap(err)
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}
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default:
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if sreq.WantReply {
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sreq.Reply(false, nil)
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}
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continue
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}
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case <-ctx.Done():
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if ctx.Err() != context.Canceled {
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return trace.Wrap(ctx.Err())
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}
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return nil
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}
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}
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}
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