global.c

/*
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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.
 */

/* a *lot* of ugly global definitions that really should be removed...
 */

#include "telnetd.h"

RCSID("$Id$");

/*
 * Telnet server variable declarations
 */
char	options[256];
char	do_dont_resp[256];
char	will_wont_resp[256];
int	linemode;	/* linemode on/off */
int	flowmode;	/* current flow control state */
int	restartany;	/* restart output on any character state */
#ifdef DIAGNOSTICS
int	diagnostic;	/* telnet diagnostic capabilities */
#endif /* DIAGNOSTICS */
int	require_otp;

slcfun	slctab[NSLC + 1];	/* slc mapping table */

char	terminaltype[41];

/*
 * I/O data buffers, pointers, and counters.
 */
char	ptyobuf[BUFSIZ+NETSLOP], *pfrontp, *pbackp;

char	netibuf[BUFSIZ], *netip;

char	netobuf[BUFSIZ+NETSLOP], *nfrontp, *nbackp;
char	*neturg;		/* one past last bye of urgent data */

int	pcc, ncc;

int	ourpty, net;
int	SYNCHing;		/* we are in TELNET SYNCH mode */

/*
 * The following are some clocks used to decide how to interpret
 * the relationship between various variables.
 */

struct clocks_t clocks;


/* whether to log unauthenticated login attempts */
int log_unauth;

/* do not print warning if connection is not encrypted */
int no_warn;

/*
 * This function appends data to nfrontp and advances nfrontp.
 */

int
output_data (const char *format, ...)
{
  va_list args;
  int remaining, ret;

  va_start(args, format);
  remaining = BUFSIZ - (nfrontp - netobuf);
  ret = vsnprintf (nfrontp,
		   remaining,
		   format,
		   args);
  nfrontp += min(ret, remaining-1);
  va_end(args);
  return ret;
}