Handling of the TIOCPKT byte seems broken in telnetd.
TIOCPKT_DATA and several control status flags are
not caught. They pass straight through and show up in
the log file when a telnet session is logged.
With bash you could try this and check the log:
telnet localhost 2>&1 | tee log.txt
(The NULL bytes are TIOCPKT_DATA)
Here's a patch.
Index: inetutils/telnetd/telnetd.c
===================================================================
RCS file: /sources/inetutils/inetutils/telnetd/telnetd.c,v
retrieving revision 1.38
diff -u -r1.38 telnetd.c
--- inetutils/telnetd/telnetd.c 29 Jun 2007 16:29:29 -0000 1.38
+++ inetutils/telnetd/telnetd.c 19 Nov 2007 19:51:21 -0000
@@ -603,12 +603,12 @@
pty_get_char (0);
copy_termbuf ();
localstat ();
+ goto tiocpkt_handled;
}
#endif
if (c & TIOCPKT_FLUSHWRITE)
{
static char flushdata[] = { IAC, DM };
- pty_get_char (0);
netclear (); /* clear buffer back */
net_output_datalen (flushdata, sizeof (flushdata));
set_neturg ();
@@ -625,10 +625,11 @@
IAC, SB, TELOPT_LFLOW,
flowmode ? LFLOW_ON : LFLOW_OFF, IAC, SE);
}
- pty_get_char (0);
}
+ pty_get_char (0);
}
+ tiocpkt_handled:
while (pty_input_level () > 0)
{
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