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
output_data(const char * format,...)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