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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)terminal.c 8.2 (Berkeley) 2/16/95 34 * $FreeBSD: src/crypto/telnet/telnet/terminal.c,v 1.2.8.2 2002/04/13 10:59:08 markm Exp $ 35 * $DragonFly: src/crypto/telnet/telnet/terminal.c,v 1.2 2003/06/17 04:24:37 dillon Exp $ 36 */ 37 38 #include <arpa/telnet.h> 39 #include <sys/types.h> 40 #include <stdlib.h> 41 42 #include "ring.h" 43 44 #include "externs.h" 45 #include "types.h" 46 47 #ifdef ENCRYPTION 48 #include <libtelnet/encrypt.h> 49 #endif 50 51 Ring ttyoring, ttyiring; 52 unsigned char ttyobuf[2*BUFSIZ], ttyibuf[BUFSIZ]; 53 54 int termdata; /* Debugging flag */ 55 56 #ifdef USE_TERMIO 57 # ifndef VDISCARD 58 cc_t termFlushChar; 59 # endif 60 # ifndef VLNEXT 61 cc_t termLiteralNextChar; 62 # endif 63 # ifndef VSUSP 64 cc_t termSuspChar; 65 # endif 66 # ifndef VWERASE 67 cc_t termWerasChar; 68 # endif 69 # ifndef VREPRINT 70 cc_t termRprntChar; 71 # endif 72 # ifndef VSTART 73 cc_t termStartChar; 74 # endif 75 # ifndef VSTOP 76 cc_t termStopChar; 77 # endif 78 # ifndef VEOL 79 cc_t termForw1Char; 80 # endif 81 # ifndef VEOL2 82 cc_t termForw2Char; 83 # endif 84 # ifndef VSTATUS 85 cc_t termAytChar; 86 # endif 87 #else 88 cc_t termForw2Char; 89 cc_t termAytChar; 90 #endif 91 92 /* 93 * initialize the terminal data structures. 94 */ 95 96 void 97 init_terminal(void) 98 { 99 if (ring_init(&ttyoring, ttyobuf, sizeof ttyobuf) != 1) { 100 exit(1); 101 } 102 if (ring_init(&ttyiring, ttyibuf, sizeof ttyibuf) != 1) { 103 exit(1); 104 } 105 autoflush = TerminalAutoFlush(); 106 } 107 108 /* 109 * Send as much data as possible to the terminal. 110 * 111 * Return value: 112 * -1: No useful work done, data waiting to go out. 113 * 0: No data was waiting, so nothing was done. 114 * 1: All waiting data was written out. 115 * n: All data - n was written out. 116 */ 117 118 int 119 ttyflush(int drop) 120 { 121 int n, n0, n1; 122 123 n0 = ring_full_count(&ttyoring); 124 if ((n1 = n = ring_full_consecutive(&ttyoring)) > 0) { 125 if (drop) { 126 TerminalFlushOutput(); 127 /* we leave 'n' alone! */ 128 } else { 129 n = TerminalWrite(ttyoring.consume, n); 130 } 131 } 132 if (n > 0) { 133 if (termdata && n) { 134 Dump('>', ttyoring.consume, n); 135 } 136 /* 137 * If we wrote everything, and the full count is 138 * larger than what we wrote, then write the 139 * rest of the buffer. 140 */ 141 if (n1 == n && n0 > n) { 142 n1 = n0 - n; 143 if (!drop) 144 n1 = TerminalWrite(ttyoring.bottom, n1); 145 if (n1 > 0) 146 n += n1; 147 } 148 ring_consumed(&ttyoring, n); 149 } 150 if (n < 0) 151 return -1; 152 if (n == n0) { 153 if (n0) 154 return -1; 155 return 0; 156 } 157 return n0 - n + 1; 158 } 159 160 161 /* 162 * These routines decides on what the mode should be (based on the values 163 * of various global variables). 164 */ 165 166 167 int 168 getconnmode(void) 169 { 170 extern int linemode; 171 int mode = 0; 172 #ifdef KLUDGELINEMODE 173 extern int kludgelinemode; 174 #endif 175 176 if (my_want_state_is_dont(TELOPT_ECHO)) 177 mode |= MODE_ECHO; 178 179 if (localflow) 180 mode |= MODE_FLOW; 181 182 if (my_want_state_is_will(TELOPT_BINARY)) 183 mode |= MODE_INBIN; 184 185 if (his_want_state_is_will(TELOPT_BINARY)) 186 mode |= MODE_OUTBIN; 187 188 #ifdef KLUDGELINEMODE 189 if (kludgelinemode) { 190 if (my_want_state_is_dont(TELOPT_SGA)) { 191 mode |= (MODE_TRAPSIG|MODE_EDIT); 192 if (dontlecho && (clocks.echotoggle > clocks.modenegotiated)) { 193 mode &= ~MODE_ECHO; 194 } 195 } 196 return(mode); 197 } 198 #endif 199 if (my_want_state_is_will(TELOPT_LINEMODE)) 200 mode |= linemode; 201 return(mode); 202 } 203 204 void 205 setconnmode(int force) 206 { 207 #ifdef ENCRYPTION 208 static int enc_passwd = 0; 209 #endif /* ENCRYPTION */ 210 int newmode; 211 212 newmode = getconnmode()|(force?MODE_FORCE:0); 213 214 TerminalNewMode(newmode); 215 216 #ifdef ENCRYPTION 217 if ((newmode & (MODE_ECHO|MODE_EDIT)) == MODE_EDIT) { 218 if (my_want_state_is_will(TELOPT_ENCRYPT) 219 && (enc_passwd == 0) && !encrypt_output) { 220 encrypt_request_start(0, 0); 221 enc_passwd = 1; 222 } 223 } else { 224 if (enc_passwd) { 225 encrypt_request_end(); 226 enc_passwd = 0; 227 } 228 } 229 #endif /* ENCRYPTION */ 230 231 } 232 233 void 234 setcommandmode(void) 235 { 236 TerminalNewMode(-1); 237 } 238