1 /* $NetBSD: terminal.c,v 1.16 2018/12/14 06:08:18 maya Exp $ */
2
3 /*
4 * Copyright (c) 1988, 1990, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 #ifndef lint
34 #if 0
35 static char sccsid[] = "@(#)terminal.c 8.2 (Berkeley) 2/16/95";
36 #else
37 __RCSID("$NetBSD: terminal.c,v 1.16 2018/12/14 06:08:18 maya Exp $");
38 #endif
39 #endif /* not lint */
40
41 #include <arpa/telnet.h>
42 #include <sys/types.h>
43
44 #include "ring.h"
45
46 #include "externs.h"
47 #include "types.h"
48
49 #ifdef ENCRYPTION
50 #include <libtelnet/encrypt.h>
51 #endif
52
53 Ring ttyoring, ttyiring;
54 unsigned char ttyobuf[2*BUFSIZ], ttyibuf[BUFSIZ];
55 char line[] = { '\0' };
56
57 int termdata; /* Debugging flag */
58
59 /*
60 * initialize the terminal data structures.
61 */
62
63 void
init_terminal(void)64 init_terminal(void)
65 {
66 if (ring_init(&ttyoring, ttyobuf, sizeof ttyobuf) != 1) {
67 exit(1);
68 }
69 if (ring_init(&ttyiring, ttyibuf, sizeof ttyibuf) != 1) {
70 exit(1);
71 }
72 autoflush = TerminalAutoFlush();
73 }
74
75
76 /*
77 * Send as much data as possible to the terminal, else exits if
78 * it encounters a permanent failure when writing to the tty.
79 *
80 * Return value:
81 * -1: No useful work done, data waiting to go out.
82 * 0: No data was waiting, so nothing was done.
83 * 1: All waiting data was written out.
84 * n: All data - n was written out.
85 */
86
87
88 int
ttyflush(int drop)89 ttyflush(int drop)
90 {
91 int n, n0, n1;
92
93 n0 = ring_full_count(&ttyoring);
94 if ((n1 = n = ring_full_consecutive(&ttyoring)) > 0) {
95 if (drop) {
96 TerminalFlushOutput();
97 /* we leave 'n' alone! */
98 } else {
99 n = TerminalWrite(ttyoring.consume, n);
100 }
101 }
102 if (n > 0) {
103 if (termdata && n) {
104 Dump('>', ttyoring.consume, n);
105 }
106 /*
107 * If we wrote everything, and the full count is
108 * larger than what we wrote, then write the
109 * rest of the buffer.
110 */
111 if (n1 == n && n0 > n) {
112 n1 = n0 - n;
113 if (!drop)
114 n1 = TerminalWrite(ttyoring.bottom, n1);
115 if (n1 > 0)
116 n += n1;
117 }
118 ring_consumed(&ttyoring, n);
119 }
120 if (n < 0) {
121 if (errno == EAGAIN || errno == EINTR) {
122 return -1;
123 } else {
124 ring_consumed(&ttyoring, ring_full_count(&ttyoring));
125 setconnmode(0);
126 setcommandmode();
127 NetClose(net);
128 fprintf(stderr, "Connection closed by foreign host.\n");
129 exit(1);
130 }
131 }
132 if (n == n0) {
133 if (n0)
134 return -1;
135 return 0;
136 }
137 return n0 - n + 1;
138 }
139
140
141 /*
142 * These routines decides on what the mode should be (based on the values
143 * of various global variables).
144 */
145
146
147 int
getconnmode(void)148 getconnmode(void)
149 {
150 extern int linemode;
151 int mode = 0;
152 #ifdef KLUDGELINEMODE
153 extern int kludgelinemode;
154 #endif
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 (my_want_state_is_will(TELOPT_BINARY))
163 mode |= MODE_INBIN;
164
165 if (his_want_state_is_will(TELOPT_BINARY))
166 mode |= MODE_OUTBIN;
167
168 #ifdef KLUDGELINEMODE
169 if (kludgelinemode) {
170 if (my_want_state_is_dont(TELOPT_SGA)) {
171 mode |= (MODE_TRAPSIG|MODE_EDIT);
172 if (dontlecho && (clocks.echotoggle > clocks.modenegotiated)) {
173 mode &= ~MODE_ECHO;
174 }
175 }
176 return(mode);
177 }
178 #endif
179 if (my_want_state_is_will(TELOPT_LINEMODE))
180 mode |= linemode;
181 return(mode);
182 }
183
184 void
setconnmode(int force)185 setconnmode(int force)
186 {
187 #ifdef ENCRYPTION
188 static int enc_passwd = 0;
189 #endif
190 int newmode;
191
192 newmode = getconnmode()|(force?MODE_FORCE:0);
193
194 TerminalNewMode(newmode);
195
196 #ifdef ENCRYPTION
197 if ((newmode & (MODE_ECHO|MODE_EDIT)) == MODE_EDIT) {
198 if (my_want_state_is_will(TELOPT_ENCRYPT)
199 && (enc_passwd == 0) && !encrypt_output) {
200 encrypt_request_start(0, 0);
201 enc_passwd = 1;
202 }
203 } else {
204 if (enc_passwd) {
205 encrypt_request_end();
206 enc_passwd = 0;
207 }
208 }
209 #endif /* ENCRYPTION */
210 }
211
212
213 void
setcommandmode(void)214 setcommandmode(void)
215 {
216 TerminalNewMode(-1);
217 }
218