global.c revision 296373 
1185573Srwatson/*
2185573Srwatson * Copyright (c) 1989, 1993
3155131Srwatson *	The Regents of the University of California.  All rights reserved.
4155131Srwatson *
5155131Srwatson * Redistribution and use in source and binary forms, with or without
6155131Srwatson * modification, are permitted provided that the following conditions
7155131Srwatson * are met:
8155131Srwatson * 1. Redistributions of source code must retain the above copyright
9155131Srwatson *    notice, this list of conditions and the following disclaimer.
10155131Srwatson * 2. Redistributions in binary form must reproduce the above copyright
11155131Srwatson *    notice, this list of conditions and the following disclaimer in the
12155131Srwatson *    documentation and/or other materials provided with the distribution.
13155131Srwatson * 3. All advertising materials mentioning features or use of this software
14155131Srwatson *    must display the following acknowledgement:
15155131Srwatson *	This product includes software developed by the University of
16155131Srwatson *	California, Berkeley and its contributors.
17155131Srwatson * 4. Neither the name of the University nor the names of its contributors
18155131Srwatson *    may be used to endorse or promote products derived from this software
19155131Srwatson *    without specific prior written permission.
20155131Srwatson *
21155131Srwatson * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22155131Srwatson * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23155131Srwatson * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24155131Srwatson * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25155131Srwatson * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26155131Srwatson * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27155131Srwatson * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28155131Srwatson * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29155131Srwatson * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30155131Srwatson * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31155131Srwatson * SUCH DAMAGE.
32155131Srwatson */
33155131Srwatson
34155131Srwatson/* a *lot* of ugly global definitions that really should be removed...
35185573Srwatson */
36
37#include "telnetd.h"
38
39RCSID("$Id$");
40
41/*
42 * Telnet server variable declarations
43 */
44char	options[256];
45char	do_dont_resp[256];
46char	will_wont_resp[256];
47int	linemode;	/* linemode on/off */
48int	flowmode;	/* current flow control state */
49int	restartany;	/* restart output on any character state */
50#ifdef DIAGNOSTICS
51int	diagnostic;	/* telnet diagnostic capabilities */
52#endif /* DIAGNOSTICS */
53int	require_otp;
54
55slcfun	slctab[NSLC + 1];	/* slc mapping table */
56
57char	terminaltype[41];
58
59/*
60 * I/O data buffers, pointers, and counters.
61 */
62char	ptyobuf[BUFSIZ+NETSLOP], *pfrontp, *pbackp;
63
64char	netibuf[BUFSIZ], *netip;
65
66char	netobuf[BUFSIZ+NETSLOP], *nfrontp, *nbackp;
67char	*neturg;		/* one past last bye of urgent data */
68
69int	pcc, ncc;
70
71int	ourpty, net;
72int	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
79struct clocks_t clocks;
80
81
82/* whether to log unauthenticated login attempts */
83int log_unauth;
84
85/* do not print warning if connection is not encrypted */
86int no_warn;
87
88/*
89 * This function appends data to nfrontp and advances nfrontp.
90 */
91
92int
93output_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}
108