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ssh/tailssh: fix terminal corruption (temporary hack)

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Maisem figured out the real problem but will take several commits
(e.g. tailscale/ssh#2) in different repos to get it fixed
properly. This is an interim hack.

Details of real fix:
https://github.com/tailscale/tailscale/issues/4146#issuecomment-1065952947

Updates #4146
Updates #3802

Change-Id: I7b7dc5713baa3e5de75b87b69e7179a6e7549b0b
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2022-03-12 13:57:01 -08:00 committed by Brad Fitzpatrick
parent ba1adf6c24
commit 012098ec32
1 changed files with 9 additions and 1 deletions
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10
ssh/tailssh/tailssh.go
View File

@ -19,6 +19,7 @@
"os"
"os/exec"
"os/user"
"reflect"
"strings"
"sync"
"time"
@ -375,7 +376,14 @@ func (srv *server) handleAcceptedSSH(ctx context.Context, s ssh.Session, ci *ssh
stdin.Close()
}()
go func() {
_, err := io.Copy(s, stdout)
// Write to s.Channel directly, avoiding gliderlab/ssh's (*session).Write
// call that translates newline endings, which we don't need.
// See https://github.com/tailscale/tailscale/issues/4146.
// TODO(bradfitz,maisem): remove this reflect hackery once gliderlab/ssh changes
// are all in.
// s is an gliderlabs/ssh.(*session); write to its Channel field.
sshChan := reflect.ValueOf(s).Elem().FieldByName("Channel").Interface().(io.Writer)
_, err := io.Copy(sshChan, stdout)
if err != nil {
// TODO: don't log in the success case.
logf("ssh: stdout copy: %v", err)