termstat.c

经典的unix下telnetd代码

/*
 * Copyright (c) 1989, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "telnetd.h"

/* RCSID("$KTH: termstat.c,v 1.11 1997/05/11 06:30:04 assar Exp $") */

/*
 * local variables
 */
int def_tspeed = -1, def_rspeed = -1;
#ifdef	TIOCSWINSZ
int def_row = 0, def_col = 0;
#endif

/*
 * flowstat
 *
 * Check for changes to flow control
 */
void
flowstat()
{
    if (his_state_is_will(TELOPT_LFLOW)) {
	if (tty_flowmode() != flowmode) {
	    flowmode = tty_flowmode();
	    output_data("%c%c%c%c%c%c",
			IAC, SB, TELOPT_LFLOW,
			flowmode ? LFLOW_ON : LFLOW_OFF,
			IAC, SE);
	}
	if (tty_restartany() != restartany) {
	    restartany = tty_restartany();
	    output_data("%c%c%c%c%c%c",
			IAC, SB, TELOPT_LFLOW,
			restartany ? LFLOW_RESTART_ANY
			: LFLOW_RESTART_XON,
			IAC, SE);
	}
    }
}

/*
 * clientstat
 *
 * Process linemode related requests from the client.
 * Client can request a change to only one of linemode, editmode or slc's
 * at a time, and if using kludge linemode, then only linemode may be
 * affected.
 */
void
clientstat(int code, int parm1, int parm2)
{
    void netflush(void);

    /*
     * Get a copy of terminal characteristics.
     */
    init_termbuf();

    /*
     * Process request from client. code tells what it is.
     */
    switch (code) {
    case TELOPT_NAWS:
#ifdef	TIOCSWINSZ
	{
	    struct winsize ws;

	    def_col = parm1;
	    def_row = parm2;

	    /*
	     * Change window size as requested by client.
	     */

	    ws.ws_col = parm1;
	    ws.ws_row = parm2;
	    ioctl(ourpty, TIOCSWINSZ, (char *)&ws);
	}
#endif	/* TIOCSWINSZ */

    break;

    case TELOPT_TSPEED:
	{
	    def_tspeed = parm1;
	    def_rspeed = parm2;
	    /*
	     * Change terminal speed as requested by client.
	     * We set the receive speed first, so that if we can't
	     * store separate 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 */

    netflush();

}