[Bug 394570] Re: Backspace via SSH only deletes last byte of characters (no IUTF8 handling, requires standardisation work)
I don't understand: why does it require an extension to SSH protocol? Sure, one possible way would be to make ssh forward this bit of information. However, the IUTF8 flag should be set consistently with the locale (the character set part), which is not forwarded by ssh either - but still set on the server. Another approach could be to do whatever happens to the locale: when you log on remotely, someone sets this environment variable for you. Whoever does this (pam, login script, whatever) could also modify the terminal settings, couldn't it? Taking this approach, you don't need to modify the protocol, just make sure that whenever someone logs in via ssh, they don't only get $LANG and stuff but also the stty iutf8 bit set correctly. Moreover, I believe the meaning of /sys/module/vt/parameters/default_utf8 is that every newly allocated terminal gets the iutf8 flag set automatically to this value by the kernel. Should the ssh server or login procedure be unable to get the locale information, they ought to respect whatever is set here. This yet again doesn't require extending the protocol. -- Backspace via SSH only deletes last byte of characters (no IUTF8 handling, requires standardisation work) https://bugs.launchpad.net/bugs/394570 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to openssh in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 394570] Re: Backspace via SSH only deletes last byte of characters (no IUTF8 handling, requires standardisation work)
** Summary changed: - Backspace via SSH only deletes last byte of characters + Backspace via SSH only deletes last byte of characters (no IUTF8 handling, requires standardisation work) -- Backspace via SSH only deletes last byte of characters (no IUTF8 handling, requires standardisation work) https://bugs.launchpad.net/bugs/394570 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to openssh in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 394570] Re: Backspace via SSH only deletes last byte of characters
You can work around this by running 'stty iutf8' on the server each time you ssh somewhere. Unfortunately fixing this requires an extension to the SSH protocol - see http://bugs.debian.org/cgi- bin/bugreport.cgi?bug=337041 for the gory details - so it won't be a quick process. ** Bug watch added: Debian Bug tracker #337041 http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=337041 ** Also affects: openssh (Debian) via http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=337041 Importance: Unknown Status: Unknown ** Changed in: openssh (Ubuntu) Status: Confirmed = Triaged -- Backspace via SSH only deletes last byte of characters https://bugs.launchpad.net/bugs/394570 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to openssh in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 394570] Re: Backspace via SSH only deletes last byte of characters
Thanks for the information. Regards chuck ** Changed in: openssh (Ubuntu) Status: Incomplete = Confirmed -- Backspace via SSH only deletes last byte of characters https://bugs.launchpad.net/bugs/394570 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to openssh in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 394570] Re: Backspace via SSH only deletes last byte of characters
Hello Chuck, I'm sorry for having taken so long to answer. Here's the status: I re-tested this issue on two Ubuntu 9.10 machines. It's the same as in the original description (even after setting the locales to a particular language). UTF-8 characters that are encoded on more than 1 byte are not fully deleted when pressing the backspace key, under SSH; only the last byte is deleted. For instance, some Chinese/Japanese (?) characters are encoded on 3 bytes. Here is an example: 構 should be encoded as e6 a7 8b. When you type and then delete this character via SSH, the file still contains the first 2 bytes of this character (i.e. e6 a7). -- Backspace via SSH only deletes last byte of characters https://bugs.launchpad.net/bugs/394570 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to openssh in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 394570] Re: Backspace via SSH only deletes last byte of characters
We'd like to figure out what's causing this bug for you, but we haven't heard back from you in a while. Could you please provide the requested information? Thanks! -- Backspace via SSH only deletes last byte of characters https://bugs.launchpad.net/bugs/394570 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to openssh in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 394570] Re: Backspace via SSH only deletes last byte of characters
Thank you for taking the time to report this bug and helping to make Ubuntu better. The issue that you reported is one that should be reproducible with the live environment of the Desktop CD of the development release - Karmic Koala. It would help us greatly if you could test with it so we can work on getting it fixed in the next release of Ubuntu. You can find out more about the development release at http://www.ubuntu.com/testing/. Thanks again and we appreciate your help. ** Changed in: openssh (Ubuntu) Importance: Undecided = Low ** Changed in: openssh (Ubuntu) Status: New = Incomplete -- Backspace via SSH only deletes last byte of characters https://bugs.launchpad.net/bugs/394570 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to openssh in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 394570] Re: Backspace via SSH only deletes last byte of characters
** Description changed:
Binary package hint: openssh-client
This is not a terminal-related problem: regardless of the terminal used
and the way the backspace key is supposed to behave (ASCII DEL, escape
sequence, Control+H), what happens is that via SSH the backspace key
only deletes the last byte of a character, not the whole character
itself.
You can notice this when you use UTF-8 characters that are encoded on
more than 1 byte. Some diacritics from the Latin alphabet are encoded on
2 bytes, whereas some Japanese characters are encoded on 3.
As an example, assume the following scenario: the letter ș is encoded
as c8 99 and endline is encoded as 0a:
u...@host:~$ cat ș.txt
ș
^d
u...@host:~$ hexdump -C ș.txt
c8 99 0a |...|
0003
Now, assume you write testș[hit backspace]test[endline]. On the
physical host (i.e. without being SSH-ed into it), the hexdump of that
file will be:
u...@host:~$ cat test.txt
testș[backspace]test
^d
u...@host:~$ hexdump -C test.txt
74 65 73 74 74 65 73 74 0a |testtest.|
0009
whereas the *same* thing via SSH would lead you to having the following
hexdump:
u...@host:~$ ssh u...@localhost
u...@localhost's password:
u...@host:~$ cat test.txt
testș[backspace]test
^d
u...@host:~$ hexdump -C test.txt
74 65 73 74 c8 74 65 73 74 0a|test.test.|
000a
So notice how backspace only deleted via SSH the last byte of ș i.e.
only the 99 out of c8 99; compare the expected hexdump:
74 65 73 74 74 65 73 74 0a
with the actual hexdump:
74 65 73 74 c8 74 65 73 74 0a
locale is set to en_US.UTF-8; changing it to ro_RO.UTF-8 (both on the
host and via SSH) yields the same results.
Finally, last details:
Ubuntu 9.04
Kernel 2.6.28-13-generic
openssh-client: Installed: 1:5.1p1-5ubuntu1
openssh-server: Installed: 1:5.1p1-5ubuntu1
+
+ L.E.: I also tried the same thing using dropbear instead of OpenSSH.
--
Backspace via SSH only deletes last byte of characters
https://bugs.launchpad.net/bugs/394570
You received this bug notification because you are a member of Ubuntu
Server Team, which is subscribed to openssh in ubuntu.
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