https://bugzilla.mindrot.org/show_bug.cgi?id=2477
Bug ID: 2477
Summary: backspace in interactive session does not delete
multi-byte Unicode characters correctly
Product: Portable OpenSSH
Version: 7.1p1
Hardware: Other
OS: Linux
Status: NEW
Severity: enhancement
Priority: P5
Component: sshd
Assignee: unassigned-b...@mindrot.org
Reporter: jje...@redhat.com
Created attachment 2723
--> https://bugzilla.mindrot.org/attachment.cgi?id=2723&action=edit
patch adding IUTF8 flag, if available
After report in our bugzilla [1] about utf8 support in remote terminals
I dived a bit into this topic and found that openssh doesn't count with
termios flag IUTF8 for handling utf8 characters interactively. This
flag exists for some time and is available in Linux kernel since
version 2.6. Really nice article [2] describes this issue (last
paragraph).
Minimal test case is also described in original bugzilla, but I will
copy it also here:
1. ssh to machine with openssh
2. $ cat > test
3. Use this as a input for cat command:
Á<press backspace once><press CTRL+D><press CTRL+D>
4. $ hexdump test
Actual results:
0000000 00c3
0000001
Expected results:
The file "test" should be empty.
Solution is quite simple. Adding this this mode into ttymodes.h solves
this issue. Problematic is that this changes things on both sides to
apply.
[1] https://bugzilla.redhat.com/show_bug.cgi?id=1270248
[2] https://www.cl.cam.ac.uk/~mgk25/unicode.html#mod
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