1 /* $OpenBSD: terminal.c,v 1.6 2003/06/03 02:56:18 millert Exp $ */
2 /* $NetBSD: terminal.c,v 1.5 1996/02/28 21:04:17 thorpej Exp $ */
3
4 /*
5 * Copyright (c) 1988, 1990, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #include "telnet_locl.h"
34
35 Ring ttyoring, ttyiring;
36 unsigned char ttyobuf[2*BUFSIZ], ttyibuf[BUFSIZ];
37
38 int termdata; /* Debugging flag */
39
40 #ifdef USE_TERMIO
41 # ifndef VDISCARD
42 cc_t termFlushChar;
43 # endif
44 # ifndef VLNEXT
45 cc_t termLiteralNextChar;
46 # endif
47 # ifndef VSUSP
48 cc_t termSuspChar;
49 # endif
50 # ifndef VWERASE
51 cc_t termWerasChar;
52 # endif
53 # ifndef VREPRINT
54 cc_t termRprntChar;
55 # endif
56 # ifndef VSTART
57 cc_t termStartChar;
58 # endif
59 # ifndef VSTOP
60 cc_t termStopChar;
61 # endif
62 # ifndef VEOL
63 cc_t termForw1Char;
64 # endif
65 # ifndef VEOL2
66 cc_t termForw2Char;
67 # endif
68 # ifndef VSTATUS
69 cc_t termAytChar;
70 # endif
71 #else
72 cc_t termForw2Char;
73 cc_t termAytChar;
74 #endif
75
76 /*
77 * initialize the terminal data structures.
78 */
79
80 void
init_terminal()81 init_terminal()
82 {
83 if (ring_init(&ttyoring, ttyobuf, sizeof ttyobuf) != 1) {
84 exit(1);
85 }
86 if (ring_init(&ttyiring, ttyibuf, sizeof ttyibuf) != 1) {
87 exit(1);
88 }
89 autoflush = TerminalAutoFlush();
90 }
91
92
93 /*
94 * Send as much data as possible to the terminal.
95 *
96 * Return value:
97 * -1: No useful work done, data waiting to go out.
98 * 0: No data was waiting, so nothing was done.
99 * 1: All waiting data was written out.
100 * n: All data - n was written out.
101 */
102
103
104 int
ttyflush(drop)105 ttyflush(drop)
106 int drop;
107 {
108 int n, n0, n1;
109
110 n0 = ring_full_count(&ttyoring);
111 if ((n1 = n = ring_full_consecutive(&ttyoring)) > 0) {
112 if (drop) {
113 TerminalFlushOutput();
114 /* we leave 'n' alone! */
115 } else {
116 n = TerminalWrite((char *)ttyoring.consume, n);
117 }
118 }
119 if (n > 0) {
120 if (termdata && n) {
121 Dump('>', ttyoring.consume, n);
122 }
123 /*
124 * If we wrote everything, and the full count is
125 * larger than what we wrote, then write the
126 * rest of the buffer.
127 */
128 if (n1 == n && n0 > n) {
129 n1 = n0 - n;
130 if (!drop)
131 n1 = TerminalWrite(ttyoring.bottom, n1);
132 if (n1 > 0)
133 n += n1;
134 }
135 ring_consumed(&ttyoring, n);
136 }
137 if (n < 0) {
138 if (errno == EPIPE)
139 kill(0, SIGQUIT);
140 return -1;
141 }
142 if (n == n0) {
143 if (n0)
144 return -1;
145 return 0;
146 }
147 return n0 - n + 1;
148 }
149
150
151 /*
152 * These routines decides on what the mode should be (based on the values
153 * of various global variables).
154 */
155
156
157 int
getconnmode()158 getconnmode()
159 {
160 extern int linemode;
161 int mode = 0;
162 #ifdef KLUDGELINEMODE
163 extern int kludgelinemode;
164 #endif
165
166 if (In3270)
167 return(MODE_FLOW);
168
169 if (my_want_state_is_dont(TELOPT_ECHO))
170 mode |= MODE_ECHO;
171
172 if (localflow)
173 mode |= MODE_FLOW;
174
175 if ((eight & 1) || my_want_state_is_will(TELOPT_BINARY))
176 mode |= MODE_INBIN;
177
178 if (eight & 2)
179 mode |= MODE_OUT8;
180 if (his_want_state_is_will(TELOPT_BINARY))
181 mode |= MODE_OUTBIN;
182
183 #ifdef KLUDGELINEMODE
184 if (kludgelinemode) {
185 if (my_want_state_is_dont(TELOPT_SGA)) {
186 mode |= (MODE_TRAPSIG|MODE_EDIT);
187 if (dontlecho && (clocks.echotoggle > clocks.modenegotiated)) {
188 mode &= ~MODE_ECHO;
189 }
190 }
191 return(mode);
192 }
193 #endif
194 if (my_want_state_is_will(TELOPT_LINEMODE))
195 mode |= linemode;
196 return(mode);
197 }
198
199 void
setconnmode(force)200 setconnmode(force)
201 int force;
202 {
203 int newmode;
204 #ifdef ENCRYPTION
205 static int enc_passwd = 0;
206 #endif
207
208 newmode = getconnmode()|(force?MODE_FORCE:0);
209
210 TerminalNewMode(newmode);
211
212 #ifdef ENCRYPTION
213 if ((newmode & (MODE_ECHO|MODE_EDIT)) == MODE_EDIT) {
214 if (my_want_state_is_will(TELOPT_ENCRYPT)
215 && (enc_passwd == 0) && !encrypt_output) {
216 encrypt_request_start(0, 0);
217 enc_passwd = 1;
218 }
219 } else {
220 if (enc_passwd) {
221 encrypt_request_end();
222 enc_passwd = 0;
223 }
224 }
225 #endif
226
227 }
228
229
230 void
setcommandmode()231 setcommandmode()
232 {
233 TerminalNewMode(-1);
234 }
235