** Changed in: openssh (Debian)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/394570
Title:
Backspace via SSH only deletes last byte of characters (no IUTF8
handling, requires standardisation work)
Status in openssh package in Ubuntu:
Triaged
Status in openssh package in Debian:
Fix Released
Bug description:
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":
user@host:~$ cat > ș.txt
ș
^d
user@host:~$ hexdump -C ș.txt
00000000 c8 99 0a |...|
00000003
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:
user@host:~$ cat > test.txt
testș[backspace]test
^d
user@host:~$ hexdump -C test.txt
00000000 74 65 73 74 74 65 73 74 0a |testtest.|
00000009
whereas the *same* thing via SSH would lead you to having the
following hexdump:
user@host:~$ ssh user@localhost
user@localhost's password:
user@host:~$ cat > test.txt
testș[backspace]test
^d
user@host:~$ hexdump -C test.txt
00000000 74 65 73 74 c8 74 65 73 74 0a |test.test.|
0000000a
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.
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