xref: /freebsd/crypto/heimdal/appl/telnet/telnetd/global.c (revision 7aa383846770374466b1dcb2cefd71bde9acf463)
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: global.c 14939 2005-04-24 20:59:35Z lha $");
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 }
108