appl/telnet/telnetd/global.c

   1 /*
   2  * Copyright (c) 1989, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 /* a *lot* of ugly global definitions that really should be removed...
  35  */
  36
  37 #include "telnetd.h"
  38
  39 RCSID("$Id$");
  40
  41 /*
  42  * Telnet server variable declarations
  43  */
  44 char    options[256];
  45 char    do_dont_resp[256];
  46 char    will_wont_resp[256];
  47 int     linemode;       /* linemode on/off */
  48 int     flowmode;       /* current flow control state */
  49 int     restartany;     /* restart output on any character state */
  50 #ifdef DIAGNOSTICS
  51 int     diagnostic;     /* telnet diagnostic capabilities */
  52 #endif /* DIAGNOSTICS */
  53 int     require_otp;
  54
  55 slcfun  slctab[NSLC + 1];       /* slc mapping table */
  56
  57 char    terminaltype[41];
  58
  59 /*
  60  * I/O data buffers, pointers, and counters.
  61  */
  62 char    ptyobuf[BUFSIZ+NETSLOP], *pfrontp, *pbackp;
  63
  64 char    netibuf[BUFSIZ], *netip;
  65
  66 char    netobuf[BUFSIZ+NETSLOP], *nfrontp, *nbackp;
  67 char    *neturg;                /* one past last bye of urgent data */
  68
  69 int     pcc, ncc;
  70
  71 int     ourpty, net;
  72 int     SYNCHing;               /* we are in TELNET SYNCH mode */
  73
  74 /*
  75  * The following are some clocks used to decide how to interpret
  76  * the relationship between various variables.
  77  */
  78
  79 struct clocks_t clocks;
  80
  81
  82 /* whether to log unauthenticated login attempts */
  83 int log_unauth;
  84
  85 /* do not print warning if connection is not encrypted */
  86 int no_warn;
  87
  88 /*
  89  * This function appends data to nfrontp and advances nfrontp.
  90  */
  91
  92 int
  93 output_data (const char *format, ...)
  94 {
  95   va_list args;
  96   int remaining, ret;
  97
  98   va_start(args, format);
  99   remaining = BUFSIZ - (nfrontp - netobuf);
 100   ret = vsnprintf (nfrontp,
 101                    remaining,
 102                    format,
 103                    args);
 104   nfrontp += min(ret, remaining-1);
 105   va_end(args);
 106   return ret;
 107 }