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. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #if 0
31 #ifndef lint
32 static const char sccsid[] = "@(#)terminal.c 8.2 (Berkeley) 2/16/95";
33 #endif
34 #endif
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
37
38 #include <arpa/telnet.h>
39 #include <sys/types.h>
40
41 #include <stdlib.h>
42
43 #include "ring.h"
44
45 #include "externs.h"
46 #include "types.h"
47
48 #ifdef ENCRYPTION
49 #include <libtelnet/encrypt.h>
50 #endif
51
52 Ring ttyoring, ttyiring;
53 unsigned char ttyobuf[2*BUFSIZ], ttyibuf[BUFSIZ];
54
55 int termdata; /* Debugging flag */
56
57 #ifdef USE_TERMIO
58 # ifndef VDISCARD
59 cc_t termFlushChar;
60 # endif
61 # ifndef VLNEXT
62 cc_t termLiteralNextChar;
63 # endif
64 # ifndef VSUSP
65 cc_t termSuspChar;
66 # endif
67 # ifndef VWERASE
68 cc_t termWerasChar;
69 # endif
70 # ifndef VREPRINT
71 cc_t termRprntChar;
72 # endif
73 # ifndef VSTART
74 cc_t termStartChar;
75 # endif
76 # ifndef VSTOP
77 cc_t termStopChar;
78 # endif
79 # ifndef VEOL
80 cc_t termForw1Char;
81 # endif
82 # ifndef VEOL2
83 cc_t termForw2Char;
84 # endif
85 # ifndef VSTATUS
86 cc_t termAytChar;
87 # endif
88 #else
89 cc_t termForw2Char;
90 cc_t termAytChar;
91 #endif
92
93 /*
94 * initialize the terminal data structures.
95 */
96
97 void
init_terminal(void)98 init_terminal(void)
99 {
100 if (ring_init(&ttyoring, ttyobuf, sizeof ttyobuf) != 1) {
101 exit(1);
102 }
103 if (ring_init(&ttyiring, ttyibuf, sizeof ttyibuf) != 1) {
104 exit(1);
105 }
106 autoflush = TerminalAutoFlush();
107 }
108
109 /*
110 * Send as much data as possible to the terminal, else exits if
111 * it encounters a permanent failure when writing to the tty.
112 *
113 * Return value:
114 * -1: No useful work done, data waiting to go out.
115 * 0: No data was waiting, so nothing was done.
116 * 1: All waiting data was written out.
117 * n: All data - n was written out.
118 */
119
120 int
ttyflush(int drop)121 ttyflush(int drop)
122 {
123 int n, n0, n1;
124
125 n0 = ring_full_count(&ttyoring);
126 if ((n1 = n = ring_full_consecutive(&ttyoring)) > 0) {
127 if (drop) {
128 TerminalFlushOutput();
129 /* we leave 'n' alone! */
130 } else {
131 n = TerminalWrite(ttyoring.consume, n);
132 }
133 }
134 if (n > 0) {
135 if (termdata && n) {
136 Dump('>', ttyoring.consume, n);
137 }
138 /*
139 * If we wrote everything, and the full count is
140 * larger than what we wrote, then write the
141 * rest of the buffer.
142 */
143 if (n1 == n && n0 > n) {
144 n1 = n0 - n;
145 if (!drop)
146 n1 = TerminalWrite(ttyoring.bottom, n1);
147 if (n1 > 0)
148 n += n1;
149 }
150 ring_consumed(&ttyoring, n);
151 }
152 if (n < 0) {
153 if (errno == EAGAIN || errno == EINTR) {
154 return -1;
155 } else {
156 ring_consumed(&ttyoring, ring_full_count(&ttyoring));
157 setconnmode(0);
158 setcommandmode();
159 NetClose(net);
160 fprintf(stderr, "Write error on local output.\n");
161 exit(1);
162 }
163 return -1;
164 }
165 if (n == n0) {
166 if (n0)
167 return -1;
168 return 0;
169 }
170 return n0 - n + 1;
171 }
172
173
174 /*
175 * These routines decides on what the mode should be (based on the values
176 * of various global variables).
177 */
178
179
180 int
getconnmode(void)181 getconnmode(void)
182 {
183 extern int linemode;
184 int mode = 0;
185 #ifdef KLUDGELINEMODE
186 extern int kludgelinemode;
187 #endif
188
189 if (my_want_state_is_dont(TELOPT_ECHO))
190 mode |= MODE_ECHO;
191
192 if (localflow)
193 mode |= MODE_FLOW;
194
195 if (my_want_state_is_will(TELOPT_BINARY))
196 mode |= MODE_INBIN;
197
198 if (his_want_state_is_will(TELOPT_BINARY))
199 mode |= MODE_OUTBIN;
200
201 #ifdef KLUDGELINEMODE
202 if (kludgelinemode) {
203 if (my_want_state_is_dont(TELOPT_SGA)) {
204 mode |= (MODE_TRAPSIG|MODE_EDIT);
205 if (dontlecho && (clocks.echotoggle > clocks.modenegotiated)) {
206 mode &= ~MODE_ECHO;
207 }
208 }
209 return(mode);
210 }
211 #endif
212 if (my_want_state_is_will(TELOPT_LINEMODE))
213 mode |= linemode;
214 return(mode);
215 }
216
217 void
setconnmode(int force)218 setconnmode(int force)
219 {
220 #ifdef ENCRYPTION
221 static int enc_passwd = 0;
222 #endif /* ENCRYPTION */
223 int newmode;
224
225 newmode = getconnmode()|(force?MODE_FORCE:0);
226
227 TerminalNewMode(newmode);
228
229 #ifdef ENCRYPTION
230 if ((newmode & (MODE_ECHO|MODE_EDIT)) == MODE_EDIT) {
231 if (my_want_state_is_will(TELOPT_ENCRYPT)
232 && (enc_passwd == 0) && !encrypt_output) {
233 encrypt_request_start(0, 0);
234 enc_passwd = 1;
235 }
236 } else {
237 if (enc_passwd) {
238 encrypt_request_end();
239 enc_passwd = 0;
240 }
241 }
242 #endif /* ENCRYPTION */
243
244 }
245
246 void
setcommandmode(void)247 setcommandmode(void)
248 {
249 TerminalNewMode(-1);
250 }
251