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List: busybox
Subject: Question about telnetd in BusyBox
From: Wåglund Oskar <oskar.waglund () afry ! com>
Date: 2019-12-09 13:42:01
Message-ID: AM0PR01MB461043D846770A6BA3A840BF91580 () AM0PR01MB4610 ! eurprd01 ! prod ! exchangelabs ! com
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Hello everyone!
I have had an issue with inetd/telnetd in BusyBox the past couple of days which I \
can't seem to get around and I was hoping for some friendly advice.
We have recently ported our product to use PetaLinux 2017.3 and with that BusyBox \
(version busybox-1.24.1), and everything has been going very well so far. Now, \
however, our customer has pointed out that sending telnet commands from their test \
framework to our product (which is running the BusyBox telnet daemon) does not work \
in their environment for commands longer than 56 characters. We have observed a \
"weird" behavior that telnetd will split up the echoed response to the client after \
56 characters by adding "whitespace, carriage return" (ASCII 0x20, 0x0D) before \
continuing the output. This is illustrated in the attached WireShark log and \
screenshot. 10.40.241.50 is the telnetd server and 10.40.241.157 is the telnet \
client.
The result of this is that the Telnet client the customer is using in their test \
framework understands the response when the command entered was 56 characters or less \
long, but adds the entered command to the interpreted response when more characters \
are entered:
Connecting...
Sending:
Sending 56 characters aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
Received:
-sh: Sending: command not found
Disconnected
Connecting...
Sending:
Sending 57 characters aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
Received:
Sending 57 characters aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
a
-sh: Sending: command not found
Disconnected
In the WireShark log you can also see that the Telnet negotiation begins with telnetd \
sending DO ECHO, to which the telnet client responds WON'T ECHO and later DON'T ECHO, \
but this has no effect it seems. I can see in a telnetd.c file in BusyBox that this \
seems to be the case, but I don't have the option to recompile the code at the \
moment:
/* Make the telnet client understand we will echo characters so it
* should not do it locally. We don't tell the client to run \
linemode,
* because we want to handle line editing and tab completion and \
other
* stuff that requires char-by-char support. */
{
static const char iacs_to_send[] ALIGN1 = \
{
IAC, DO, \
TELOPT_ECHO,
IAC, DO, \
TELOPT_NAWS,
/* This requires \
telnetd.ctrlSQ.patch (incomplete) */
/*IAC, DO, \
TELOPT_LFLOW,*/
IAC, WILL, \
TELOPT_ECHO,
IAC, WILL, \
TELOPT_SGA };
I have also seen a piece of code that seems related to the above mentioned problem \
but haven't been able to connect the dots:
/* We map \r\n ==> \r for pragmatic reasons.
* Many client \
implementations send \r\n when
* the user hits the \
CarriageReturn key.
* See RFC 1123 3.3.1 \
Telnet End-of-Line Convention.
*/
if (c == '\r' && ptr \
< end && (*ptr == '\n' || *ptr == '\0'))
\
ptr++; continue;
Now my questions to you are
1. Is the added "0x20, 0x0D" a known issue/feature? (Maybe it is not the telnetd \
client adding it after all?) 2. Is there a way of disabling ECHO in telnetd \
somehow? I have tried desperately to configure this behavior through inetd.cfg and \
inetd.conf but to no avail so far.
I would be most grateful for any advice on this and I would also like to take the \
opportunity to thank you all for the great product that you have produced in BusyBox! \
😊
Best regards
Oskar Wåglund
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<p class="MsoNormal"><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif">Hello \
everyone!<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif">I have had an \
issue with inetd/telnetd in BusyBox the past couple of days which I can't seem to get \
around and I was hoping for some friendly advice.<o:p></o:p></span></p> <p \
class="MsoNormal"><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif">We have recently \
ported our product to use PetaLinux 2017.3 and with that BusyBox (version \
busybox-1.24.1), and everything has been going very well so far. Now, however, our \
customer has pointed out that sending telnet commands from their test framework to \
our product (which is running the BusyBox telnet daemon) does not work in their \
environment for commands longer than 56 characters. We have observed a "weird" \
behavior that telnetd will split up the echoed response to the client after 56 \
characters by adding "whitespace, carriage return" (ASCII 0x20, 0x0D) before \
continuing the output. This is illustrated in the attached WireShark log and \
screenshot. 10.40.241.50 is the telnetd server and 10.40.241.157 is the telnet \
client.<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif">The result of this \
is that the Telnet client the customer is using in their test framework understands \
the response when the command entered was 56 characters or less long, but adds the \
entered command to the interpreted response when more characters are \
entered:<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><i><span lang="EN-US" \
style="font-size:10.0pt;font-family:Consolas;color:black">Connecting...</span></i><i><span \
lang="EN-US" style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></i></p> \
<p class="MsoNormal" style="text-autospace:none"><i><span lang="EN-US" \
style="font-size:10.0pt;font-family:Consolas"><o:p> </o:p></span></i></p> <p \
class="MsoNormal" style="text-autospace:none"><i><span lang="EN-US" \
style="font-size:10.0pt;font-family:Consolas;color:black">Sending:</span></i><i><span \
lang="EN-US" style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></i></p> \
<p class="MsoNormal" style="text-autospace:none"><i><span lang="EN-US" \
style="font-size:10.0pt;font-family:Consolas;color:black">Sending 56 characters \
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa</span></i><i><span lang="EN-US" \
style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></i></p> <p \
class="MsoNormal" style="text-autospace:none"><i><span lang="EN-US" \
style="font-size:10.0pt;font-family:Consolas"><o:p> </o:p></span></i></p> <p \
class="MsoNormal" style="text-autospace:none"><i><span lang="EN-US" \
style="font-size:10.0pt;font-family:Consolas;color:black">Received:</span></i><i><span \
lang="EN-US" style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></i></p> \
<p class="MsoNormal" style="text-autospace:none"><i><span lang="EN-US" \
style="font-size:10.0pt;font-family:Consolas;color:black">-sh: Sending: command not \
found</span></i><i><span lang="EN-US" \
style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></i></p> <p \
class="MsoNormal" style="text-autospace:none"><i><span lang="EN-US" \
style="font-size:10.0pt;font-family:Consolas"><o:p> </o:p></span></i></p> <p \
class="MsoNormal"><i><span lang="EN-US" \
style="font-size:10.0pt;font-family:Consolas;color:black">Disconnected</span></i><i><span \
lang="EN-US" style="font-size:9.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></i></p>
<p class="MsoNormal" style="text-autospace:none"><i><span lang="EN-US" \
style="font-size:10.0pt;font-family:Consolas"><o:p> </o:p></span></i></p> <p \
class="MsoNormal" style="text-autospace:none"><i><span lang="EN-US" \
style="font-size:10.0pt;font-family:Consolas"><o:p> </o:p></span></i></p> <p \
class="MsoNormal" style="text-autospace:none"><i><span lang="EN-US" \
style="font-size:10.0pt;font-family:Consolas;color:black">Connecting...</span></i><i><span \
lang="EN-US" style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></i></p> \
<p class="MsoNormal" style="text-autospace:none"><i><span lang="EN-US" \
style="font-size:10.0pt;font-family:Consolas"><o:p> </o:p></span></i></p> <p \
class="MsoNormal" style="text-autospace:none"><i><span lang="EN-US" \
style="font-size:10.0pt;font-family:Consolas;color:black">Sending:</span></i><i><span \
lang="EN-US" style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></i></p> \
<p class="MsoNormal" style="text-autospace:none"><i><span lang="EN-US" \
style="font-size:10.0pt;font-family:Consolas;color:black">Sending 57 characters \
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa</span></i><i><span lang="EN-US" \
style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></i></p> <p \
class="MsoNormal" style="text-autospace:none"><i><span lang="EN-US" \
style="font-size:10.0pt;font-family:Consolas"><o:p> </o:p></span></i></p> <p \
class="MsoNormal" style="text-autospace:none"><i><span lang="EN-US" \
style="font-size:10.0pt;font-family:Consolas;color:black">Received:</span></i><i><span \
lang="EN-US" style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></i></p> \
<p class="MsoNormal" style="text-autospace:none"><i><span lang="EN-US" \
style="font-size:10.0pt;font-family:Consolas;color:black">Sending 57 characters \
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa </span></i><i><span lang="EN-US" \
style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></i></p> <p \
class="MsoNormal" style="text-autospace:none"><i><span lang="EN-US" \
style="font-size:10.0pt;font-family:Consolas;color:black">a</span></i><i><span \
lang="EN-US" style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></i></p> \
<p class="MsoNormal" style="text-autospace:none"><i><span lang="EN-US" \
style="font-size:10.0pt;font-family:Consolas;color:black">-sh: Sending: command not \
found</span></i><i><span lang="EN-US" \
style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></i></p> <p \
class="MsoNormal" style="text-autospace:none"><i><span lang="EN-US" \
style="font-size:10.0pt;font-family:Consolas"><o:p> </o:p></span></i></p> <p \
class="MsoNormal"><i><span lang="EN-US" \
style="font-size:10.0pt;font-family:Consolas;color:black">Disconnected</span></i><i><span \
lang="EN-US" style="font-size:9.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></i></p>
<p class="MsoNormal"><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif">In the WireShark \
log you can also see that the Telnet negotiation begins with telnetd sending DO ECHO, \
to which the telnet client responds WON'T ECHO and later DON'T ECHO, but this has no \
effect it seems. I can see in a telnetd.c file in BusyBox that this seems to be the \
case, but I don't have the option to recompile the code at the \
moment:<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><i><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif">/* Make the telnet \
client understand we will echo characters so it<o:p></o:p></span></i></p> <p \
class="MsoNormal"><i><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif"> & \
nbsp; \
* should not do it locally. We don't tell the client to run \
linemode,<o:p></o:p></span></i></p> <p class="MsoNormal"><i><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif"> & \
nbsp; \
* because we want to handle line editing and tab completion and \
other<o:p></o:p></span></i></p> <p class="MsoNormal"><i><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif"> & \
nbsp; \
* stuff that requires char-by-char support. */<o:p></o:p></span></i></p> <p \
class="MsoNormal"><i><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif"> & \
nbsp; \
{<o:p></o:p></span></i></p> <p class="MsoNormal"><i><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif"> & \
nbsp; &nb \
sp; \
static const char iacs_to_send[] ALIGN1 = {<o:p></o:p></span></i></p> <p \
class="MsoNormal"><i><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif"> & \
nbsp; &nb \
sp;   \
; & \
nbsp;
</span></i><i><span lang="PL" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif">IAC, DO, \
TELOPT_ECHO,<o:p></o:p></span></i></p> <p class="MsoNormal"><i><span lang="PL" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif"> & \
nbsp; &nb \
sp;   \
; & \
nbsp; \
IAC, DO, TELOPT_NAWS,<o:p></o:p></span></i></p> <p class="MsoNormal"><i><span \
lang="PL" style="font-size:9.0pt;font-family:"Verdana",sans-serif"> &nb \
sp;   \
; & \
nbsp; &nb \
sp;
</span></i><i><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif">/* This requires \
telnetd.ctrlSQ.patch (incomplete) */<o:p></o:p></span></i></p> <p \
class="MsoNormal"><i><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif"> & \
nbsp; &nb \
sp;   \
; & \
nbsp; \
/*IAC, DO, TELOPT_LFLOW,*/<o:p></o:p></span></i></p> <p class="MsoNormal"><i><span \
lang="EN-US" style="font-size:9.0pt;font-family:"Verdana",sans-serif"> \
&n \
bsp; &nbs \
p; \
\
IAC, WILL, TELOPT_ECHO,<o:p></o:p></span></i></p> <p class="MsoNormal"><i><span \
lang="EN-US" style="font-size:9.0pt;font-family:"Verdana",sans-serif"> \
&n \
bsp; &nbs \
p; \
\
IAC, WILL, TELOPT_SGA<o:p></o:p></span></i></p> <p class="MsoNormal"><i><span \
lang="EN-US" style="font-size:9.0pt;font-family:"Verdana",sans-serif"> \
&n \
bsp; \
};<o:p></o:p></span></i></p> <p class="MsoNormal"><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif">I have also seen a \
piece of code that seems related to the above mentioned problem but haven't been able \
to connect the dots:<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><i><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif">/* We map \r\n \
==> \r for pragmatic reasons.<o:p></o:p></span></i></p> <p \
class="MsoNormal"><i><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif"> & \
nbsp; &nb \
sp;   \
; & \
nbsp; \
* Many client implementations send \r\n when<o:p></o:p></span></i></p> <p \
class="MsoNormal"><i><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif"> & \
nbsp; &nb \
sp;   \
; & \
nbsp; \
* the user hits the CarriageReturn key.<o:p></o:p></span></i></p> <p \
class="MsoNormal"><i><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif"> & \
nbsp; &nb \
sp;   \
; & \
nbsp; \
* See RFC 1123 3.3.1 Telnet End-of-Line Convention.<o:p></o:p></span></i></p> <p \
<p class="MsoNormal"><i><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif"> & \
nbsp; &nb \
sp;   \
; & \
nbsp; \
if (c == '\r' && ptr < end && (*ptr == '\n' || *ptr == \
'\0'))<o:p></o:p></span></i></p> <p class="MsoNormal"><i><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif"> & \
nbsp; &nb \
sp;   \
; & \
nbsp; &nb \
sp; \
ptr++;<o:p></o:p></span></i></p> <p class="MsoNormal"><i><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif"> & \
nbsp; &nb \
sp;   \
; & \
nbsp; \
continue;<o:p></o:p></span></i></p> <p class="MsoNormal"><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif">Now my questions \
to you are<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
<ol style="margin-top:0cm" start="1" type="1">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo3"><span \
lang="EN-US" style="font-size:9.0pt;font-family:"Verdana",sans-serif">Is \
the added "0x20, 0x0D" a known issue/feature? (Maybe it is not the telnetd client \
adding it after all?)<o:p></o:p></span></li><li class="MsoListParagraph" \
style="margin-left:0cm;mso-list:l0 level1 lfo3"><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif">Is there a way of \
disabling ECHO in telnetd somehow? I have tried desperately to configure this \
behavior through inetd.cfg and inetd.conf but to no avail so \
far.<o:p></o:p></span></li></ol> <p class="MsoNormal"><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif">I would be most \
grateful for any advice on this and I would also like to take the opportunity to \
thank you all for the great product that you have produced in BusyBox! </span><span \
lang="EN-US" style="font-size:9.0pt;font-family:"Segoe UI \
Emoji",sans-serif">😊</span><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" \
style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:black;letter-spacing:.4pt;mso-fareast-language:DE">Best \
regards<o:p></o:p></span></b></p> <p class="MsoNormal"><b><span lang="EN-US" \
style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:black;letter-spacing:.4pt;mso-fareast-language:DE">Oskar \
Wåglund</span></b><span lang="EN-US" \
style="mso-fareast-language:DE"><o:p></o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US"><o:p> </o:p></span></p> </div>
<p><br>
<span style="font-size: 7pt; color: #838383;">This e-mail may contain confidential \
and corporate proprietary information. If received in error, kindly notify us \
immediately and delete the communication from your system. Our contacts with you may \
further involve processing of personal data. Please read more about how and why ÅF \
processes personal data on our website <a style="color: #838383;" \
href="http://www.afconsult.com/sv/other-pages/privacy-statement/privacy-statement-for-externals/">
www.afconsult.com</a> .</span></p>
</body>
</html>
["TelnetTest.png" (image/png)]
["TelnetTest.pcapng" (application/octet-stream)]
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