661 lines
17 KiB
C
661 lines
17 KiB
C
/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)termstat.c 8.1 (Berkeley) 6/4/93";
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#endif /* not lint */
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#include "telnetd.h"
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/*
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* local variables
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*/
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int def_tspeed = -1, def_rspeed = -1;
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#ifdef TIOCSWINSZ
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int def_row = 0, def_col = 0;
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#endif
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#ifdef LINEMODE
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static int _terminit = 0;
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#endif /* LINEMODE */
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#if defined(CRAY2) && defined(UNICOS5)
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int newmap = 1; /* nonzero if \n maps to ^M^J */
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#endif
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#ifdef LINEMODE
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/*
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* localstat
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*
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* This function handles all management of linemode.
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*
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* Linemode allows the client to do the local editing of data
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* and send only complete lines to the server. Linemode state is
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* based on the state of the pty driver. If the pty is set for
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* external processing, then we can use linemode. Further, if we
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* can use real linemode, then we can look at the edit control bits
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* in the pty to determine what editing the client should do.
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*
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* Linemode support uses the following state flags to keep track of
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* current and desired linemode state.
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* alwayslinemode : true if -l was specified on the telnetd
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* command line. It means to have linemode on as much as
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* possible.
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*
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* lmodetype: signifies whether the client can
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* handle real linemode, or if use of kludgeomatic linemode
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* is preferred. It will be set to one of the following:
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* REAL_LINEMODE : use linemode option
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* NO_KLUDGE : don't initiate kludge linemode.
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* KLUDGE_LINEMODE : use kludge linemode
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* NO_LINEMODE : client is ignorant of linemode
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*
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* linemode, uselinemode : linemode is true if linemode
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* is currently on, uselinemode is the state that we wish
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* to be in. If another function wishes to turn linemode
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* on or off, it sets or clears uselinemode.
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*
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* editmode, useeditmode : like linemode/uselinemode, but
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* these contain the edit mode states (edit and trapsig).
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*
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* The state variables correspond to some of the state information
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* in the pty.
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* linemode:
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* In real linemode, this corresponds to whether the pty
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* expects external processing of incoming data.
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* In kludge linemode, this more closely corresponds to the
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* whether normal processing is on or not. (ICANON in
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* system V, or COOKED mode in BSD.)
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* If the -l option was specified (alwayslinemode), then
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* an attempt is made to force external processing on at
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* all times.
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*
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* The following heuristics are applied to determine linemode
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* handling within the server.
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* 1) Early on in starting up the server, an attempt is made
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* to negotiate the linemode option. If this succeeds
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* then lmodetype is set to REAL_LINEMODE and all linemode
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* processing occurs in the context of the linemode option.
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* 2) If the attempt to negotiate the linemode option failed,
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* and the "-k" (don't initiate kludge linemode) isn't set,
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* then we try to use kludge linemode. We test for this
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* capability by sending "do Timing Mark". If a positive
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* response comes back, then we assume that the client
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* understands kludge linemode (ech!) and the
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* lmodetype flag is set to KLUDGE_LINEMODE.
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* 3) Otherwise, linemode is not supported at all and
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* lmodetype remains set to NO_LINEMODE (which happens
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* to be 0 for convenience).
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* 4) At any time a command arrives that implies a higher
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* state of linemode support in the client, we move to that
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* linemode support.
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*
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* A short explanation of kludge linemode is in order here.
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* 1) The heuristic to determine support for kludge linemode
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* is to send a do timing mark. We assume that a client
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* that supports timing marks also supports kludge linemode.
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* A risky proposition at best.
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* 2) Further negotiation of linemode is done by changing the
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* the server's state regarding SGA. If server will SGA,
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* then linemode is off, if server won't SGA, then linemode
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* is on.
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*/
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void
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localstat()
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{
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void netflush();
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int need_will_echo = 0;
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#if defined(CRAY2) && defined(UNICOS5)
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/*
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* Keep track of that ol' CR/NL mapping while we're in the
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* neighborhood.
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*/
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newmap = tty_isnewmap();
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#endif /* defined(CRAY2) && defined(UNICOS5) */
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/*
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* Check for state of BINARY options.
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*/
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if (tty_isbinaryin()) {
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if (his_want_state_is_wont(TELOPT_BINARY))
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send_do(TELOPT_BINARY, 1);
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} else {
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if (his_want_state_is_will(TELOPT_BINARY))
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send_dont(TELOPT_BINARY, 1);
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}
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if (tty_isbinaryout()) {
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if (my_want_state_is_wont(TELOPT_BINARY))
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send_will(TELOPT_BINARY, 1);
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} else {
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if (my_want_state_is_will(TELOPT_BINARY))
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send_wont(TELOPT_BINARY, 1);
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}
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/*
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* Check for changes to flow control if client supports it.
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*/
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flowstat();
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/*
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* Check linemode on/off state
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*/
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uselinemode = tty_linemode();
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/*
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* If alwayslinemode is on, and pty is changing to turn it off, then
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* force linemode back on.
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*/
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if (alwayslinemode && linemode && !uselinemode) {
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uselinemode = 1;
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tty_setlinemode(uselinemode);
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}
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#ifdef ENCRYPTION
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/*
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* If the terminal is not echoing, but editing is enabled,
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* something like password input is going to happen, so
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* if we the other side is not currently sending encrypted
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* data, ask the other side to start encrypting.
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*/
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if (his_state_is_will(TELOPT_ENCRYPT)) {
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static int enc_passwd = 0;
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if (uselinemode && !tty_isecho() && tty_isediting()
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&& (enc_passwd == 0) && !decrypt_input) {
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encrypt_send_request_start();
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enc_passwd = 1;
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} else if (enc_passwd) {
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encrypt_send_request_end();
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enc_passwd = 0;
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}
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}
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#endif /* ENCRYPTION */
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/*
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* Do echo mode handling as soon as we know what the
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* linemode is going to be.
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* If the pty has echo turned off, then tell the client that
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* the server will echo. If echo is on, then the server
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* will echo if in character mode, but in linemode the
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* client should do local echoing. The state machine will
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* not send anything if it is unnecessary, so don't worry
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* about that here.
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*
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* If we need to send the WILL ECHO (because echo is off),
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* then delay that until after we have changed the MODE.
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* This way, when the user is turning off both editing
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* and echo, the client will get editing turned off first.
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* This keeps the client from going into encryption mode
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* and then right back out if it is doing auto-encryption
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* when passwords are being typed.
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*/
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if (uselinemode) {
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if (tty_isecho())
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send_wont(TELOPT_ECHO, 1);
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else
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need_will_echo = 1;
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#ifdef KLUDGELINEMODE
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if (lmodetype == KLUDGE_OK)
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lmodetype = KLUDGE_LINEMODE;
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#endif
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}
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/*
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* If linemode is being turned off, send appropriate
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* command and then we're all done.
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*/
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if (!uselinemode && linemode) {
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# ifdef KLUDGELINEMODE
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if (lmodetype == REAL_LINEMODE) {
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# endif /* KLUDGELINEMODE */
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send_dont(TELOPT_LINEMODE, 1);
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# ifdef KLUDGELINEMODE
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} else if (lmodetype == KLUDGE_LINEMODE)
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send_will(TELOPT_SGA, 1);
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# endif /* KLUDGELINEMODE */
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send_will(TELOPT_ECHO, 1);
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linemode = uselinemode;
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goto done;
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}
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# ifdef KLUDGELINEMODE
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/*
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* If using real linemode check edit modes for possible later use.
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* If we are in kludge linemode, do the SGA negotiation.
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*/
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if (lmodetype == REAL_LINEMODE) {
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# endif /* KLUDGELINEMODE */
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useeditmode = 0;
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if (tty_isediting())
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useeditmode |= MODE_EDIT;
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if (tty_istrapsig())
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useeditmode |= MODE_TRAPSIG;
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if (tty_issofttab())
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useeditmode |= MODE_SOFT_TAB;
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if (tty_islitecho())
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useeditmode |= MODE_LIT_ECHO;
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# ifdef KLUDGELINEMODE
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} else if (lmodetype == KLUDGE_LINEMODE) {
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if (tty_isediting() && uselinemode)
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send_wont(TELOPT_SGA, 1);
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else
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send_will(TELOPT_SGA, 1);
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}
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# endif /* KLUDGELINEMODE */
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/*
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* Negotiate linemode on if pty state has changed to turn it on.
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* Send appropriate command and send along edit mode, then all done.
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*/
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if (uselinemode && !linemode) {
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# ifdef KLUDGELINEMODE
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if (lmodetype == KLUDGE_LINEMODE) {
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send_wont(TELOPT_SGA, 1);
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} else if (lmodetype == REAL_LINEMODE) {
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# endif /* KLUDGELINEMODE */
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send_do(TELOPT_LINEMODE, 1);
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/* send along edit modes */
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(void) sprintf(nfrontp, "%c%c%c%c%c%c%c", IAC, SB,
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TELOPT_LINEMODE, LM_MODE, useeditmode,
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IAC, SE);
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nfrontp += 7;
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editmode = useeditmode;
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# ifdef KLUDGELINEMODE
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}
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# endif /* KLUDGELINEMODE */
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linemode = uselinemode;
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goto done;
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}
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# ifdef KLUDGELINEMODE
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/*
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* None of what follows is of any value if not using
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* real linemode.
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*/
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if (lmodetype < REAL_LINEMODE)
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goto done;
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# endif /* KLUDGELINEMODE */
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if (linemode && his_state_is_will(TELOPT_LINEMODE)) {
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/*
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* If edit mode changed, send edit mode.
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*/
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if (useeditmode != editmode) {
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/*
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* Send along appropriate edit mode mask.
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*/
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(void) sprintf(nfrontp, "%c%c%c%c%c%c%c", IAC, SB,
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TELOPT_LINEMODE, LM_MODE, useeditmode,
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IAC, SE);
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nfrontp += 7;
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editmode = useeditmode;
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}
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/*
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* Check for changes to special characters in use.
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*/
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start_slc(0);
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check_slc();
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(void) end_slc(0);
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}
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done:
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if (need_will_echo)
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send_will(TELOPT_ECHO, 1);
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/*
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* Some things should be deferred until after the pty state has
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* been set by the local process. Do those things that have been
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* deferred now. This only happens once.
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*/
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if (_terminit == 0) {
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_terminit = 1;
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defer_terminit();
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}
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netflush();
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set_termbuf();
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return;
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} /* end of localstat */
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#endif /* LINEMODE */
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/*
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* flowstat
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*
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* Check for changes to flow control
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*/
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void
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flowstat()
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{
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if (his_state_is_will(TELOPT_LFLOW)) {
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if (tty_flowmode() != flowmode) {
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flowmode = tty_flowmode();
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(void) sprintf(nfrontp, "%c%c%c%c%c%c",
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IAC, SB, TELOPT_LFLOW,
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flowmode ? LFLOW_ON : LFLOW_OFF,
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IAC, SE);
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nfrontp += 6;
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}
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if (tty_restartany() != restartany) {
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restartany = tty_restartany();
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(void) sprintf(nfrontp, "%c%c%c%c%c%c",
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IAC, SB, TELOPT_LFLOW,
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restartany ? LFLOW_RESTART_ANY
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: LFLOW_RESTART_XON,
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IAC, SE);
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nfrontp += 6;
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}
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}
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}
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/*
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* clientstat
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*
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* Process linemode related requests from the client.
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* Client can request a change to only one of linemode, editmode or slc's
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* at a time, and if using kludge linemode, then only linemode may be
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* affected.
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*/
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void
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clientstat(code, parm1, parm2)
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register int code, parm1, parm2;
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{
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void netflush();
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/*
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* Get a copy of terminal characteristics.
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*/
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init_termbuf();
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/*
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* Process request from client. code tells what it is.
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*/
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switch (code) {
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#ifdef LINEMODE
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case TELOPT_LINEMODE:
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/*
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* Don't do anything unless client is asking us to change
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* modes.
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*/
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uselinemode = (parm1 == WILL);
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if (uselinemode != linemode) {
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# ifdef KLUDGELINEMODE
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/*
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* If using kludge linemode, make sure that
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* we can do what the client asks.
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* We can not turn off linemode if alwayslinemode
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* and the ICANON bit is set.
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*/
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if (lmodetype == KLUDGE_LINEMODE) {
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if (alwayslinemode && tty_isediting()) {
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uselinemode = 1;
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}
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}
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/*
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* Quit now if we can't do it.
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*/
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if (uselinemode == linemode)
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return;
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/*
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* If using real linemode and linemode is being
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* turned on, send along the edit mode mask.
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*/
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if (lmodetype == REAL_LINEMODE && uselinemode)
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# else /* KLUDGELINEMODE */
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if (uselinemode)
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# endif /* KLUDGELINEMODE */
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{
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useeditmode = 0;
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if (tty_isediting())
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useeditmode |= MODE_EDIT;
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if (tty_istrapsig)
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useeditmode |= MODE_TRAPSIG;
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if (tty_issofttab())
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useeditmode |= MODE_SOFT_TAB;
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if (tty_islitecho())
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useeditmode |= MODE_LIT_ECHO;
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(void) sprintf(nfrontp, "%c%c%c%c%c%c%c", IAC,
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SB, TELOPT_LINEMODE, LM_MODE,
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useeditmode, IAC, SE);
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nfrontp += 7;
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editmode = useeditmode;
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}
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tty_setlinemode(uselinemode);
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linemode = uselinemode;
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if (!linemode)
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send_will(TELOPT_ECHO, 1);
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}
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break;
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case LM_MODE:
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{
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register int ack, changed;
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/*
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* Client has sent along a mode mask. If it agrees with
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* what we are currently doing, ignore it; if not, it could
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* be viewed as a request to change. Note that the server
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* will change to the modes in an ack if it is different from
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* what we currently have, but we will not ack the ack.
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*/
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useeditmode &= MODE_MASK;
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ack = (useeditmode & MODE_ACK);
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useeditmode &= ~MODE_ACK;
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if (changed = (useeditmode ^ editmode)) {
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/*
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* This check is for a timing problem. If the
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* state of the tty has changed (due to the user
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* application) we need to process that info
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* before we write in the state contained in the
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* ack!!! This gets out the new MODE request,
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* and when the ack to that command comes back
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* we'll set it and be in the right mode.
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*/
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if (ack)
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localstat();
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if (changed & MODE_EDIT)
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tty_setedit(useeditmode & MODE_EDIT);
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if (changed & MODE_TRAPSIG)
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tty_setsig(useeditmode & MODE_TRAPSIG);
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if (changed & MODE_SOFT_TAB)
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tty_setsofttab(useeditmode & MODE_SOFT_TAB);
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|
if (changed & MODE_LIT_ECHO)
|
|
tty_setlitecho(useeditmode & MODE_LIT_ECHO);
|
|
|
|
set_termbuf();
|
|
|
|
if (!ack) {
|
|
(void) sprintf(nfrontp, "%c%c%c%c%c%c%c", IAC,
|
|
SB, TELOPT_LINEMODE, LM_MODE,
|
|
useeditmode|MODE_ACK,
|
|
IAC, SE);
|
|
nfrontp += 7;
|
|
}
|
|
|
|
editmode = useeditmode;
|
|
}
|
|
|
|
break;
|
|
|
|
} /* end of case LM_MODE */
|
|
#endif /* LINEMODE */
|
|
|
|
case TELOPT_NAWS:
|
|
#ifdef TIOCSWINSZ
|
|
{
|
|
struct winsize ws;
|
|
|
|
def_col = parm1;
|
|
def_row = parm2;
|
|
#ifdef LINEMODE
|
|
/*
|
|
* Defer changing window size until after terminal is
|
|
* initialized.
|
|
*/
|
|
if (terminit() == 0)
|
|
return;
|
|
#endif /* LINEMODE */
|
|
|
|
/*
|
|
* Change window size as requested by client.
|
|
*/
|
|
|
|
ws.ws_col = parm1;
|
|
ws.ws_row = parm2;
|
|
(void) ioctl(pty, TIOCSWINSZ, (char *)&ws);
|
|
}
|
|
#endif /* TIOCSWINSZ */
|
|
|
|
break;
|
|
|
|
case TELOPT_TSPEED:
|
|
{
|
|
def_tspeed = parm1;
|
|
def_rspeed = parm2;
|
|
#ifdef LINEMODE
|
|
/*
|
|
* Defer changing the terminal speed.
|
|
*/
|
|
if (terminit() == 0)
|
|
return;
|
|
#endif /* LINEMODE */
|
|
/*
|
|
* Change terminal speed as requested by client.
|
|
* We set the receive speed first, so that if we can't
|
|
* store seperate receive and transmit speeds, the transmit
|
|
* speed will take precedence.
|
|
*/
|
|
tty_rspeed(parm2);
|
|
tty_tspeed(parm1);
|
|
set_termbuf();
|
|
|
|
break;
|
|
|
|
} /* end of case TELOPT_TSPEED */
|
|
|
|
default:
|
|
/* What? */
|
|
break;
|
|
} /* end of switch */
|
|
|
|
#if defined(CRAY2) && defined(UNICOS5)
|
|
/*
|
|
* Just in case of the likely event that we changed the pty state.
|
|
*/
|
|
rcv_ioctl();
|
|
#endif /* defined(CRAY2) && defined(UNICOS5) */
|
|
|
|
netflush();
|
|
|
|
} /* end of clientstat */
|
|
|
|
#if defined(CRAY2) && defined(UNICOS5)
|
|
void
|
|
termstat()
|
|
{
|
|
needtermstat = 1;
|
|
}
|
|
|
|
void
|
|
_termstat()
|
|
{
|
|
needtermstat = 0;
|
|
init_termbuf();
|
|
localstat();
|
|
rcv_ioctl();
|
|
}
|
|
#endif /* defined(CRAY2) && defined(UNICOS5) */
|
|
|
|
#ifdef LINEMODE
|
|
/*
|
|
* defer_terminit
|
|
*
|
|
* Some things should not be done until after the login process has started
|
|
* and all the pty modes are set to what they are supposed to be. This
|
|
* function is called when the pty state has been processed for the first time.
|
|
* It calls other functions that do things that were deferred in each module.
|
|
*/
|
|
void
|
|
defer_terminit()
|
|
{
|
|
|
|
/*
|
|
* local stuff that got deferred.
|
|
*/
|
|
if (def_tspeed != -1) {
|
|
clientstat(TELOPT_TSPEED, def_tspeed, def_rspeed);
|
|
def_tspeed = def_rspeed = 0;
|
|
}
|
|
|
|
#ifdef TIOCSWINSZ
|
|
if (def_col || def_row) {
|
|
struct winsize ws;
|
|
|
|
bzero((char *)&ws, sizeof(ws));
|
|
ws.ws_col = def_col;
|
|
ws.ws_row = def_row;
|
|
(void) ioctl(pty, TIOCSWINSZ, (char *)&ws);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* The only other module that currently defers anything.
|
|
*/
|
|
deferslc();
|
|
|
|
} /* end of defer_terminit */
|
|
|
|
/*
|
|
* terminit
|
|
*
|
|
* Returns true if the pty state has been processed yet.
|
|
*/
|
|
int
|
|
terminit()
|
|
{
|
|
return(_terminit);
|
|
|
|
} /* end of terminit */
|
|
#endif /* LINEMODE */
|