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 34 #if 0 35 #ifndef lint 36 static const char sccsid[] = "@(#)terminal.c 8.2 (Berkeley) 2/16/95"; 37 #endif 38 #endif 39 #include <sys/cdefs.h> 40 __FBSDID("$FreeBSD: src/contrib/telnet/telnet/terminal.c,v 1.7 2003/05/04 02:54:48 obrien Exp $"); 41 42 #include <arpa/telnet.h> 43 #include <sys/types.h> 44 45 #include <stdlib.h> 46 47 #include "ring.h" 48 49 #include "externs.h" 50 #include "types.h" 51 52 #ifdef ENCRYPTION 53 #include <libtelnet/encrypt.h> 54 #endif 55 56 Ring ttyoring, ttyiring; 57 unsigned char ttyobuf[2*BUFSIZ], ttyibuf[BUFSIZ]; 58 59 int termdata; /* Debugging flag */ 60 61 #ifdef USE_TERMIO 62 # ifndef VDISCARD 63 cc_t termFlushChar; 64 # endif 65 # ifndef VLNEXT 66 cc_t termLiteralNextChar; 67 # endif 68 # ifndef VSUSP 69 cc_t termSuspChar; 70 # endif 71 # ifndef VWERASE 72 cc_t termWerasChar; 73 # endif 74 # ifndef VREPRINT 75 cc_t termRprntChar; 76 # endif 77 # ifndef VSTART 78 cc_t termStartChar; 79 # endif 80 # ifndef VSTOP 81 cc_t termStopChar; 82 # endif 83 # ifndef VEOL 84 cc_t termForw1Char; 85 # endif 86 # ifndef VEOL2 87 cc_t termForw2Char; 88 # endif 89 # ifndef VSTATUS 90 cc_t termAytChar; 91 # endif 92 #else 93 cc_t termForw2Char; 94 cc_t termAytChar; 95 #endif 96 97 /* 98 * initialize the terminal data structures. 99 */ 100 101 void 102 init_terminal(void) 103 { 104 if (ring_init(&ttyoring, ttyobuf, sizeof ttyobuf) != 1) { 105 exit(1); 106 } 107 if (ring_init(&ttyiring, ttyibuf, sizeof ttyibuf) != 1) { 108 exit(1); 109 } 110 autoflush = TerminalAutoFlush(); 111 } 112 113 /* 114 * Send as much data as possible to the terminal. 115 * 116 * Return value: 117 * -1: No useful work done, data waiting to go out. 118 * 0: No data was waiting, so nothing was done. 119 * 1: All waiting data was written out. 120 * n: All data - n was written out. 121 */ 122 123 int 124 ttyflush(int drop) 125 { 126 int n, n0, n1; 127 128 n0 = ring_full_count(&ttyoring); 129 if ((n1 = n = ring_full_consecutive(&ttyoring)) > 0) { 130 if (drop) { 131 TerminalFlushOutput(); 132 /* we leave 'n' alone! */ 133 } else { 134 n = TerminalWrite(ttyoring.consume, n); 135 } 136 } 137 if (n > 0) { 138 if (termdata && n) { 139 Dump('>', ttyoring.consume, n); 140 } 141 /* 142 * If we wrote everything, and the full count is 143 * larger than what we wrote, then write the 144 * rest of the buffer. 145 */ 146 if (n1 == n && n0 > n) { 147 n1 = n0 - n; 148 if (!drop) 149 n1 = TerminalWrite(ttyoring.bottom, n1); 150 if (n1 > 0) 151 n += n1; 152 } 153 ring_consumed(&ttyoring, n); 154 } 155 if (n < 0) 156 return -1; 157 if (n == n0) { 158 if (n0) 159 return -1; 160 return 0; 161 } 162 return n0 - n + 1; 163 } 164 165 166 /* 167 * These routines decides on what the mode should be (based on the values 168 * of various global variables). 169 */ 170 171 172 int 173 getconnmode(void) 174 { 175 extern int linemode; 176 int mode = 0; 177 #ifdef KLUDGELINEMODE 178 extern int kludgelinemode; 179 #endif 180 181 if (my_want_state_is_dont(TELOPT_ECHO)) 182 mode |= MODE_ECHO; 183 184 if (localflow) 185 mode |= MODE_FLOW; 186 187 if (my_want_state_is_will(TELOPT_BINARY)) 188 mode |= MODE_INBIN; 189 190 if (his_want_state_is_will(TELOPT_BINARY)) 191 mode |= MODE_OUTBIN; 192 193 #ifdef KLUDGELINEMODE 194 if (kludgelinemode) { 195 if (my_want_state_is_dont(TELOPT_SGA)) { 196 mode |= (MODE_TRAPSIG|MODE_EDIT); 197 if (dontlecho && (clocks.echotoggle > clocks.modenegotiated)) { 198 mode &= ~MODE_ECHO; 199 } 200 } 201 return(mode); 202 } 203 #endif 204 if (my_want_state_is_will(TELOPT_LINEMODE)) 205 mode |= linemode; 206 return(mode); 207 } 208 209 void 210 setconnmode(int force) 211 { 212 #ifdef ENCRYPTION 213 static int enc_passwd = 0; 214 #endif /* ENCRYPTION */ 215 int newmode; 216 217 newmode = getconnmode()|(force?MODE_FORCE:0); 218 219 TerminalNewMode(newmode); 220 221 #ifdef ENCRYPTION 222 if ((newmode & (MODE_ECHO|MODE_EDIT)) == MODE_EDIT) { 223 if (my_want_state_is_will(TELOPT_ENCRYPT) 224 && (enc_passwd == 0) && !encrypt_output) { 225 encrypt_request_start(0, 0); 226 enc_passwd = 1; 227 } 228 } else { 229 if (enc_passwd) { 230 encrypt_request_end(); 231 enc_passwd = 0; 232 } 233 } 234 #endif /* ENCRYPTION */ 235 236 } 237 238 void 239 setcommandmode(void) 240 { 241 TerminalNewMode(-1); 242 } 243