1 /*
2 * Copyright (c) 1988, 1990, 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 #include "telnet_locl.h"
35
36 RCSID("$Id$");
37
38 Ring ttyoring, ttyiring;
39 unsigned char ttyobuf[2*BUFSIZ], ttyibuf[BUFSIZ];
40
41 int termdata; /* Debugging flag */
42
43 # ifndef VDISCARD
44 cc_t termFlushChar;
45 # endif
46 # ifndef VLNEXT
47 cc_t termLiteralNextChar;
48 # endif
49 # ifndef VSUSP
50 cc_t termSuspChar;
51 # endif
52 # ifndef VWERASE
53 cc_t termWerasChar;
54 # endif
55 # ifndef VREPRINT
56 cc_t termRprntChar;
57 # endif
58 # ifndef VSTART
59 cc_t termStartChar;
60 # endif
61 # ifndef VSTOP
62 cc_t termStopChar;
63 # endif
64 # ifndef VEOL
65 cc_t termForw1Char;
66 # endif
67 # ifndef VEOL2
68 cc_t termForw2Char;
69 # endif
70 # ifndef VSTATUS
71 cc_t termAytChar;
72 # endif
73
74 /*
75 * initialize the terminal data structures.
76 */
77
78 void
init_terminal(void)79 init_terminal(void)
80 {
81 if (ring_init(&ttyoring, ttyobuf, sizeof ttyobuf) != 1) {
82 exit(1);
83 }
84 if (ring_init(&ttyiring, ttyibuf, sizeof ttyibuf) != 1) {
85 exit(1);
86 }
87 autoflush = TerminalAutoFlush();
88 }
89
90
91 /*
92 * Send as much data as possible to the terminal.
93 *
94 * Return value:
95 * -1: No useful work done, data waiting to go out.
96 * 0: No data was waiting, so nothing was done.
97 * 1: All waiting data was written out.
98 * n: All data - n was written out.
99 */
100
101
102 int
ttyflush(int drop)103 ttyflush(int drop)
104 {
105 int n, n0, n1;
106
107 n0 = ring_full_count(&ttyoring);
108 if ((n1 = n = ring_full_consecutive(&ttyoring)) > 0) {
109 if (drop) {
110 TerminalFlushOutput();
111 /* we leave 'n' alone! */
112 } else {
113 n = TerminalWrite((char *)ttyoring.consume, n);
114 }
115 }
116 if (n > 0) {
117 if (termdata && n) {
118 Dump('>', ttyoring.consume, n);
119 }
120 /*
121 * If we wrote everything, and the full count is
122 * larger than what we wrote, then write the
123 * rest of the buffer.
124 */
125 if (n1 == n && n0 > n) {
126 n1 = n0 - n;
127 if (!drop)
128 n1 = TerminalWrite((char *)ttyoring.bottom, n1);
129 if (n1 > 0)
130 n += n1;
131 }
132 ring_consumed(&ttyoring, n);
133 }
134 if (n < 0)
135 return -1;
136 if (n == n0) {
137 if (n0)
138 return -1;
139 return 0;
140 }
141 return n0 - n + 1;
142 }
143
144
145 /*
146 * These routines decides on what the mode should be (based on the values
147 * of various global variables).
148 */
149
150
151 int
getconnmode(void)152 getconnmode(void)
153 {
154 int mode = 0;
155
156 if (my_want_state_is_dont(TELOPT_ECHO))
157 mode |= MODE_ECHO;
158
159 if (localflow)
160 mode |= MODE_FLOW;
161
162 if ((eight & 1) || my_want_state_is_will(TELOPT_BINARY))
163 mode |= MODE_INBIN;
164
165 if (eight & 2)
166 mode |= MODE_OUT8;
167 if (his_want_state_is_will(TELOPT_BINARY))
168 mode |= MODE_OUTBIN;
169
170 #ifdef KLUDGELINEMODE
171 if (kludgelinemode) {
172 if (my_want_state_is_dont(TELOPT_SGA)) {
173 mode |= (MODE_TRAPSIG|MODE_EDIT);
174 if (dontlecho && (clocks.echotoggle > clocks.modenegotiated)) {
175 mode &= ~MODE_ECHO;
176 }
177 }
178 return(mode);
179 }
180 #endif
181 if (my_want_state_is_will(TELOPT_LINEMODE))
182 mode |= linemode;
183 return(mode);
184 }
185
186 void
setconnmode(force)187 setconnmode(force)
188 int force;
189 {
190 #ifdef ENCRYPTION
191 static int enc_passwd = 0;
192 #endif
193 int newmode;
194
195 newmode = getconnmode()|(force?MODE_FORCE:0);
196
197 TerminalNewMode(newmode);
198
199 #ifdef ENCRYPTION
200 if ((newmode & (MODE_ECHO|MODE_EDIT)) == MODE_EDIT) {
201 if (my_want_state_is_will(TELOPT_ENCRYPT)
202 && (enc_passwd == 0) && !encrypt_output) {
203 encrypt_request_start(0, 0);
204 enc_passwd = 1;
205 }
206 } else {
207 if (enc_passwd) {
208 encrypt_request_end();
209 enc_passwd = 0;
210 }
211 }
212 #endif
213
214 }
215
216
217 void
setcommandmode()218 setcommandmode()
219 {
220 TerminalNewMode(-1);
221 }
222