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 * @(#)terminal.c 8.2 (Berkeley) 2/16/95 30 * $FreeBSD: src/crypto/telnet/telnet/terminal.c,v 1.2.8.2 2002/04/13 10:59:08 markm Exp $ 31 */ 32 33 #include <arpa/telnet.h> 34 #include <sys/types.h> 35 #include <stdlib.h> 36 37 #include "ring.h" 38 39 #include "externs.h" 40 #include "types.h" 41 42 #ifdef ENCRYPTION 43 #include <libtelnet/encrypt.h> 44 #endif 45 46 Ring ttyoring, ttyiring; 47 unsigned char ttyobuf[2*BUFSIZ], ttyibuf[BUFSIZ]; 48 49 int termdata; /* Debugging flag */ 50 51 #ifdef USE_TERMIO 52 # ifndef VDISCARD 53 cc_t termFlushChar; 54 # endif 55 # ifndef VLNEXT 56 cc_t termLiteralNextChar; 57 # endif 58 # ifndef VSUSP 59 cc_t termSuspChar; 60 # endif 61 # ifndef VWERASE 62 cc_t termWerasChar; 63 # endif 64 # ifndef VREPRINT 65 cc_t termRprntChar; 66 # endif 67 # ifndef VSTART 68 cc_t termStartChar; 69 # endif 70 # ifndef VSTOP 71 cc_t termStopChar; 72 # endif 73 # ifndef VEOL 74 cc_t termForw1Char; 75 # endif 76 # ifndef VEOL2 77 cc_t termForw2Char; 78 # endif 79 # ifndef VSTATUS 80 cc_t termAytChar; 81 # endif 82 #else 83 cc_t termForw2Char; 84 cc_t termAytChar; 85 #endif 86 87 /* 88 * initialize the terminal data structures. 89 */ 90 91 void 92 init_terminal(void) 93 { 94 if (ring_init(&ttyoring, ttyobuf, sizeof ttyobuf) != 1) { 95 exit(1); 96 } 97 if (ring_init(&ttyiring, ttyibuf, sizeof ttyibuf) != 1) { 98 exit(1); 99 } 100 autoflush = TerminalAutoFlush(); 101 } 102 103 /* 104 * Send as much data as possible to the terminal. 105 * 106 * Return value: 107 * -1: No useful work done, data waiting to go out. 108 * 0: No data was waiting, so nothing was done. 109 * 1: All waiting data was written out. 110 * n: All data - n was written out. 111 */ 112 113 int 114 ttyflush(int drop) 115 { 116 int n, n0, n1; 117 118 n0 = ring_full_count(&ttyoring); 119 if ((n1 = n = ring_full_consecutive(&ttyoring)) > 0) { 120 if (drop) { 121 TerminalFlushOutput(); 122 /* we leave 'n' alone! */ 123 } else { 124 n = TerminalWrite(ttyoring.consume, n); 125 } 126 } 127 if (n > 0) { 128 if (termdata && n) { 129 Dump('>', ttyoring.consume, n); 130 } 131 /* 132 * If we wrote everything, and the full count is 133 * larger than what we wrote, then write the 134 * rest of the buffer. 135 */ 136 if (n1 == n && n0 > n) { 137 n1 = n0 - n; 138 if (!drop) 139 n1 = TerminalWrite(ttyoring.bottom, n1); 140 if (n1 > 0) 141 n += n1; 142 } 143 ring_consumed(&ttyoring, n); 144 } 145 if (n < 0) 146 return -1; 147 if (n == n0) { 148 if (n0) 149 return -1; 150 return 0; 151 } 152 return n0 - n + 1; 153 } 154 155 156 /* 157 * These routines decides on what the mode should be (based on the values 158 * of various global variables). 159 */ 160 161 162 int 163 getconnmode(void) 164 { 165 extern int linemode; 166 int mode = 0; 167 #ifdef KLUDGELINEMODE 168 extern int kludgelinemode; 169 #endif 170 171 if (my_want_state_is_dont(TELOPT_ECHO)) 172 mode |= MODE_ECHO; 173 174 if (localflow) 175 mode |= MODE_FLOW; 176 177 if (my_want_state_is_will(TELOPT_BINARY)) 178 mode |= MODE_INBIN; 179 180 if (his_want_state_is_will(TELOPT_BINARY)) 181 mode |= MODE_OUTBIN; 182 183 #ifdef KLUDGELINEMODE 184 if (kludgelinemode) { 185 if (my_want_state_is_dont(TELOPT_SGA)) { 186 mode |= (MODE_TRAPSIG|MODE_EDIT); 187 if (dontlecho && (clocks.echotoggle > clocks.modenegotiated)) { 188 mode &= ~MODE_ECHO; 189 } 190 } 191 return(mode); 192 } 193 #endif 194 if (my_want_state_is_will(TELOPT_LINEMODE)) 195 mode |= linemode; 196 return(mode); 197 } 198 199 void 200 setconnmode(int force) 201 { 202 #ifdef ENCRYPTION 203 static int enc_passwd = 0; 204 #endif /* ENCRYPTION */ 205 int newmode; 206 207 newmode = getconnmode()|(force?MODE_FORCE:0); 208 209 TerminalNewMode(newmode); 210 211 #ifdef ENCRYPTION 212 if ((newmode & (MODE_ECHO|MODE_EDIT)) == MODE_EDIT) { 213 if (my_want_state_is_will(TELOPT_ENCRYPT) 214 && (enc_passwd == 0) && !encrypt_output) { 215 encrypt_request_start(0, 0); 216 enc_passwd = 1; 217 } 218 } else { 219 if (enc_passwd) { 220 encrypt_request_end(); 221 enc_passwd = 0; 222 } 223 } 224 #endif /* ENCRYPTION */ 225 226 } 227 228 void 229 setcommandmode(void) 230 { 231 TerminalNewMode(-1); 232 } 233