1 /* $OpenBSD: terminal.c,v 1.14 2017/07/07 09:14:26 fcambus 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 #include <arpa/telnet.h>
36 #include <errno.h>
37 #include <unistd.h>
38
39 Ring ttyoring, ttyiring;
40 unsigned char ttyobuf[2*BUFSIZ], ttyibuf[BUFSIZ];
41
42 int termdata; /* Debugging flag */
43
44 /*
45 * initialize the terminal data structures.
46 */
47
48 void
init_terminal(void)49 init_terminal(void)
50 {
51 struct termios tc;
52
53 ring_init(&ttyoring, ttyobuf, sizeof ttyobuf);
54 ring_init(&ttyiring, ttyibuf, sizeof ttyibuf);
55
56 tcgetattr(0, &tc);
57 autoflush = (tc.c_lflag & NOFLSH) == 0;
58 }
59
60 /*
61 * Send as much data as possible to the terminal.
62 *
63 * Return value:
64 * -1: No useful work done, data waiting to go out.
65 * 0: No data was waiting, so nothing was done.
66 * 1: All waiting data was written out.
67 * n: All data - n was written out.
68 */
69
70 int
ttyflush(int drop)71 ttyflush(int drop)
72 {
73 int n, n0, n1;
74
75 n0 = ring_full_count(&ttyoring);
76 if ((n1 = n = ring_full_consecutive(&ttyoring)) > 0) {
77 if (drop) {
78 tcflush(fileno(stdout), TCOFLUSH);
79 /* we leave 'n' alone! */
80 } else {
81 n = write(tout, ttyoring.consume, n);
82 }
83 }
84 if (n > 0) {
85 if (termdata && n) {
86 Dump('>', ttyoring.consume, n);
87 }
88 /*
89 * If we wrote everything, and the full count is
90 * larger than what we wrote, then write the
91 * rest of the buffer.
92 */
93 if (n1 == n && n0 > n) {
94 n1 = n0 - n;
95 if (!drop)
96 n1 = write(tout, ttyoring.bottom, n1);
97 if (n1 > 0)
98 n += n1;
99 }
100 ring_consumed(&ttyoring, n);
101 }
102 if (n < 0) {
103 if (errno == EPIPE)
104 kill(0, SIGQUIT);
105 return -1;
106 }
107 if (n == n0) {
108 if (n0)
109 return -1;
110 return 0;
111 }
112 return n0 - n + 1;
113 }
114
115
116 /*
117 * These routines decides on what the mode should be (based on the values
118 * of various global variables).
119 */
120
121 int
getconnmode(void)122 getconnmode(void)
123 {
124 int mode = 0;
125
126 if (my_want_state_is_dont(TELOPT_ECHO))
127 mode |= MODE_ECHO;
128
129 if (localflow)
130 mode |= MODE_FLOW;
131
132 if ((eight & 1) || my_want_state_is_will(TELOPT_BINARY))
133 mode |= MODE_INBIN;
134
135 if (eight & 2)
136 mode |= MODE_OUT8;
137 if (his_want_state_is_will(TELOPT_BINARY))
138 mode |= MODE_OUTBIN;
139
140 #ifdef KLUDGELINEMODE
141 if (kludgelinemode) {
142 if (my_want_state_is_dont(TELOPT_SGA)) {
143 mode |= (MODE_TRAPSIG|MODE_EDIT);
144 if (dontlecho && (clocks.echotoggle > clocks.modenegotiated)) {
145 mode &= ~MODE_ECHO;
146 }
147 }
148 return(mode);
149 }
150 #endif
151 if (my_want_state_is_will(TELOPT_LINEMODE))
152 mode |= linemode;
153 return(mode);
154 }
155
156 void
setconnmode(int force)157 setconnmode(int force)
158 {
159 int newmode;
160
161 newmode = getconnmode()|(force?MODE_FORCE:0);
162
163 TerminalNewMode(newmode);
164 }
165
166 void
setcommandmode(void)167 setcommandmode(void)
168 {
169 TerminalNewMode(-1);
170 }
171