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 32static const char sccsid[] = "@(#)terminal.c 8.2 (Berkeley) 2/16/95"; 33#endif 34#endif 35#include <sys/cdefs.h> 36__FBSDID("$FreeBSD: stable/11/contrib/telnet/telnet/terminal.c 351432 2019-08-23 17:40:47Z emaste $"); 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 52Ring ttyoring, ttyiring; 53unsigned char ttyobuf[2*BUFSIZ], ttyibuf[BUFSIZ]; 54 55int termdata; /* Debugging flag */ 56 57#ifdef USE_TERMIO 58# ifndef VDISCARD 59cc_t termFlushChar; 60# endif 61# ifndef VLNEXT 62cc_t termLiteralNextChar; 63# endif 64# ifndef VSUSP 65cc_t termSuspChar; 66# endif 67# ifndef VWERASE 68cc_t termWerasChar; 69# endif 70# ifndef VREPRINT 71cc_t termRprntChar; 72# endif 73# ifndef VSTART 74cc_t termStartChar; 75# endif 76# ifndef VSTOP 77cc_t termStopChar; 78# endif 79# ifndef VEOL 80cc_t termForw1Char; 81# endif 82# ifndef VEOL2 83cc_t termForw2Char; 84# endif 85# ifndef VSTATUS 86cc_t termAytChar; 87# endif 88#else 89cc_t termForw2Char; 90cc_t termAytChar; 91#endif 92 93/* 94 * initialize the terminal data structures. 95 */ 96 97void 98init_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 120int 121ttyflush(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 180int 181getconnmode(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 217void 218setconnmode(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 246void 247setcommandmode(void) 248{ 249 TerminalNewMode(-1); 250} 251