Issue 58 in shellinabox: Hangs when SSH-ing into Solaris shells after login
shell...@googlecode.com
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Labels: Type-Defect Priority-Medium
New issue 58 by tmcreech: Hangs when SSH-ing into Solaris shells after login
http://code.google.com/p/shellinabox/issues/detail?id=58
What steps will reproduce the problem?
1. Get shellinabox hosted on a Linux box
2. Log in to that machine using shellinabox
3. ssh somesolarisbox.com, authenticate
What is the expected output? What do you see instead?
I expect to see bash/zsh/whatever on the Solaris box. Instead, the
tab/window in my browser seems to stop responding key presses.
What version of the product are you using? On what operating system?
2.10-1 on Debian Lenny (i386) from the .deb provided at code.google.com.
Please provide any additional information below.
I have tried connecting to Solaris 10 and Opensolaris snv111 and snv133
machines using FireFox 3.5, 3.6, Opera 10.10, and Safari 4.
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Comment #1 on issue 58 by joonas.tuominen: Hangs when SSH-ing into Solaris
http://code.google.com/p/shellinabox/issues/detail?id=58
I can also confirm this problem with multiple different systems.
Also Shell in a box will not build on Solaris. So shell in a box will not
work in anyway with solaris.
shell...@googlecode.com
Comment #2 on issue 58 by jonathan...@gmail.com: Hangs when SSH-ing into
http://code.google.com/p/shellinabox/issues/detail?id=58
Maybe it's related to termcap/terminfo and how it's processed by BSD and
Solaris? I know a lot of older systems complain about something as common
as TERM=rxvt-unicode, so maybe changing the value of shellinabox's $TERM
would fix it?
shell...@googlecode.com
Comment #3 on issue 58 by ian.hoog...@gmail.com: Hangs when SSH-ing into
http://code.google.com/p/shellinabox/issues/detail?id=58
After connection from Linux (OEL6) to Solaris (11) and no output is given,
the commands are processed!
When you issue 'exit' right after login to Solaris, the output
is 'Connection to w.x.y.z closed.' (probably more will work to...)
SSH-ing with putty from Linux to Solaris works, so it seems only the
processing off output from Solaris.
shell...@googlecode.com
Comment #4 on issue 58 by ja...@ring.gs: Hangs when SSH-ing into Solaris
http://code.google.com/p/shellinabox/issues/detail?id=58
Has there been any movement on this bug?
I can confirm this bug exists with Shellinabox running on Debian 6 and
CentOS 6 when connecting to a Solaris 10 host. Problem exists if the
shellinabox service is LOGIN or SSH.
shell...@googlecode.com
Comment #5 on issue 58 by ja...@ring.gs: Hangs when SSH-ing into Solaris
http://code.google.com/p/shellinabox/issues/detail?id=58
Additionally, if Shellinabox is configured to SSH directly to a Solaris
host, ala -s /:SSH:solaris.host.net it also fails. (same behaviour as if
logging into a Linux host and then ssh'ing to the Solaris host)
From my investigations I think it may be todo with the way Shellinabox does
STDIN/STDOUT redirection. But I havent looked too deeply at the source code.
shell...@googlecode.com
Comment #6 on issue 58 by ja...@ring.gs: Hangs when SSH-ing into Solaris
http://code.google.com/p/shellinabox/issues/detail?id=58
Further, telnet to a Solaris 11 host works fine.
shell...@googlecode.com
Comment #7 on issue 58 by ja...@ring.gs: Hangs when SSH-ing into Solaris
http://code.google.com/p/shellinabox/issues/detail?id=58
Further. Running a telnet server on the Linux based Shellinabox server, and
telnetting to localhost then SSH'ing to a Solaris host works fine.
As a stop gap, anyone else experiencing this bug may try this if your local
security policy allows it:
Run a telnet server on localhost
Setup shellinabox to run telnet localhost as an unprivileged user rather
than /bin/login
shell...@googlecode.com
Comment #8 on issue 58 by valerio....@gmail.com: Hangs when SSH-ing into
http://code.google.com/p/shellinabox/issues/detail?id=58
We use this work-around to make it works
- run shellinaboxd, putting a script that make a remote connection as first
task to do
- when an user call shellinabox, that script makes a telnet connection on
localhost
- then, using expect (bash scripting on *unix), the script makes a ssh
connection on Solaris remote host
I hope this information could help someone (this problem make us crazy)
shell...@googlecode.com
Comment #9 on issue 58 by storm...@yahoo.com: Hangs when SSH-ing into
I figured out the solution for this bug. If you login to Linux and run
stty, the terminal speed is 0. Linux accepts this, but Solaris takes a
baud speed of 0 literally and sends/receives no characters (hangs).
There are problems with launcher.c. First of all, the usage of
cfsetispeed/cfsetospeed() is dubious. The second argument requires a type
speed_t, which is not just a standard integer. These are #defined macros.
So instead of 38400, we really want B38400 (which does not expand to the
integer 38400 by the way).
Secondly, the calls to cfset*speed() aren't working as expected at all.
The only way I could get the terminal speed set properly was to include "|
B38400" in the tt.c_cflag list. Once the terminal speed is set to
something sane like 38400, running stty after login to a Linux box should
also show this speed. And thus when connecting to Solaris, it will in turn
get that speed as well. And the hang should go away.
Finally (unrelated to this bug), Solaris 10 doesn't like ^? for the
backspace key. The default on Solaris 10 is ^H. So this patch also
includes a fix for that, but only for launcher.c. I believe more needs to
be done with vt100.jspp before ^H works properly. An improvement would be
a way to toggle this in configure so it hits all necessary files. Not
everyone uses Linux exclusively and not everyone agrees that ^? should be
backspace. I know it's easy to fix with stty, but a Solaris (or even
HP-UX) shop typically likes to use ^H across the board. Feel free to
remove the VERASE portion of the patch if you do not want this.
Patch:
--- shellinabox-2.14/shellinabox/launcher.c.orig 2012-08-18
00:49:59.816968852 -0400
+++ shellinabox-2.14/shellinabox/launcher.c 2012-08-27 18:56:12.966625229
-0400
@@ -1479,13 +1480,14 @@
// Set initial terminal settings
struct termios tt = { 0 };
tcgetattr(0, &tt);
- cfsetispeed(&tt, 38400);
- cfsetospeed(&tt, 38400);
+ cfsetispeed(&tt, B38400);
+ cfsetospeed(&tt, B38400);
tt.c_iflag = TTYDEF_IFLAG & ~ISTRIP;
tt.c_oflag = TTYDEF_OFLAG;
tt.c_lflag = TTYDEF_LFLAG;
- tt.c_cflag = (TTYDEF_CFLAG & ~(CS7|PARENB|HUPCL)) | CS8;
- tt.c_cc[VERASE] = '\x7F';
+ tt.c_cflag = (TTYDEF_CFLAG & ~(CS7|PARENB|HUPCL)) | CS8 | B38400;
+ //tt.c_cc[VERASE] = '\x7F';
+ tt.c_cc[VERASE] = '\x08';
tcsetattr(0, TCSAFLUSH, &tt);
// Assert root privileges in order to update utmp entry.
shell...@googlecode.com
Comment #10 on issue 58 by afteixe...@gmail.com: Hangs when SSH-ing into
Very much thanks for this solution!
Works like a charm! :)
shell...@googlecode.com
Comment #11 on issue 58 by beewoo...@gmail.com: Hangs when SSH-ing into
The patch as given doesn't look right for inclusion. According to the
termios man page, the inclusion of B38400 in the c_cflag is not POSIX. If
someone who can test this is able to include
cfsetspeed(&tt, B38400)
and observe that it solves the Solaris hang then I'll include it in an
update.
BTW, the ^H/DEL change isn't likely to make everyone happy. I'm pretty
sure you can work around this by changing the local terminal settings for
the Solaris session.
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Comment #12 on issue 58 by ja...@ring.gs: Hangs when SSH-ing into Solaris
We've had both of those fixes (cfsetspeed and the ^H/DEL one) in production
for a year or so now without any observed issues accessing Solaris 10 and
EL5/EL6 hosts.
shell...@googlecode.com
Comment #13 on issue 58 by luka.kra...@gmail.com: Hangs when SSH-ing into
Solaris shells after login
https://code.google.com/p/shellinabox/issues/detail?id=58
Hi,
here is a POSIX compliant patch for setting default terminal speed. We have
to call
cfsetospeed() after we change c_cflag, otherwise speed setting can be
overwritten.
This is also integrated in our new fork on github:
https://github.com/shellinabox/shellinabox/
@@ -1509,13 +1509,13 @@ static void childProcess(struct Service *service,
int width, int height,
struct termios tt = { 0 };
tcgetattr(0, &tt);
- cfsetispeed(&tt, 38400);
- cfsetospeed(&tt, 38400);
tt.c_oflag = TTYDEF_OFLAG;
tt.c_lflag = TTYDEF_LFLAG;
+ cfsetospeed(&tt, B38400);
// Assert root privileges in order to update utmp entry.