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Increase delay to a minimum of 500 ms when requesting device attributes

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This avoids treating the terminal response as user input when it comes
over a network connection.

I confirmed that this fixed the issue for me when ssh-ing from a Windows
host (Windows Terminal, OpenSSH_for_Windows_9.5) to a Linux host.
This commit is contained in:
jyn
2025-03-15 22:46:41 -04:00
parent d4b8635f50
commit 03a154da16
1 changed files with 10 additions and 0 deletions
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10
tty-keys.c
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@@ -937,6 +937,16 @@ partial_key:
delay = options_get_number(global_options, "escape-time"); delay = options_get_number(global_options, "escape-time");
if (delay == 0) if (delay == 0)
delay = 1; delay = 1;
/* During startup, we request the Device Attributes from the terminal.
* When connecting via ssh, the response is sometimes broken over multiple TCP packets,
* and the delay would cause us to treat the escape code as user input.
* See https://github.com/PowerShell/Win32-OpenSSH/issues/2275 for more information.
* Raise the delay temporarily until we see a response. */
if (delay < 500 && (tty->flags & TTY_ALL_REQUEST_FLAGS) != TTY_ALL_REQUEST_FLAGS) {
log_debug("%s: increase delay for DA query", c->name);
delay = 500;
}
tv.tv_sec = delay / 1000; tv.tv_sec = delay / 1000;
tv.tv_usec = (delay % 1000) * 1000L; tv.tv_usec = (delay % 1000) * 1000L;