1 /* $NetBSD: terminal.c,v 1.10 2003/06/18 20:51:01 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1988, 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)terminal.c 8.2 (Berkeley) 2/16/95"; 40 #else 41 __RCSID("$NetBSD: terminal.c,v 1.10 2003/06/18 20:51:01 christos Exp $"); 42 #endif 43 #endif /* not lint */ 44 45 #include <arpa/telnet.h> 46 #include <sys/types.h> 47 48 #include "ring.h" 49 50 #include "externs.h" 51 #include "types.h" 52 53 #ifdef ENCRYPTION 54 #include <libtelnet/encrypt.h> 55 #endif 56 57 Ring ttyoring, ttyiring; 58 unsigned char ttyobuf[2*BUFSIZ], ttyibuf[BUFSIZ]; 59 60 int termdata; /* Debugging flag */ 61 62 #ifdef USE_TERMIO 63 # ifndef VDISCARD 64 cc_t termFlushChar; 65 # endif 66 # ifndef VLNEXT 67 cc_t termLiteralNextChar; 68 # endif 69 # ifndef VSUSP 70 cc_t termSuspChar; 71 # endif 72 # ifndef VWERASE 73 cc_t termWerasChar; 74 # endif 75 # ifndef VREPRINT 76 cc_t termRprntChar; 77 # endif 78 # ifndef VSTART 79 cc_t termStartChar; 80 # endif 81 # ifndef VSTOP 82 cc_t termStopChar; 83 # endif 84 # ifndef VEOL 85 cc_t termForw1Char; 86 # endif 87 # ifndef VEOL2 88 cc_t termForw2Char; 89 # endif 90 # ifndef VSTATUS 91 cc_t termAytChar; 92 # endif 93 #else 94 cc_t termForw2Char; 95 cc_t termAytChar; 96 #endif 97 98 /* 99 * initialize the terminal data structures. 100 */ 101 102 void 103 init_terminal(void) 104 { 105 if (ring_init(&ttyoring, ttyobuf, sizeof ttyobuf) != 1) { 106 exit(1); 107 } 108 if (ring_init(&ttyiring, ttyibuf, sizeof ttyibuf) != 1) { 109 exit(1); 110 } 111 autoflush = TerminalAutoFlush(); 112 } 113 114 115 /* 116 * Send as much data as possible to the terminal. 117 * 118 * Return value: 119 * -2: Permanent error writing to FD. 120 * -1: No useful work done, data waiting to go out. 121 * 0: No data was waiting, so nothing was done. 122 * 1: All waiting data was written out. 123 * n: All data - n was written out. 124 */ 125 126 127 int 128 ttyflush(int drop) 129 { 130 int n, n0, n1; 131 132 n0 = ring_full_count(&ttyoring); 133 if ((n1 = n = ring_full_consecutive(&ttyoring)) > 0) { 134 if (drop) { 135 TerminalFlushOutput(); 136 /* we leave 'n' alone! */ 137 } else { 138 n = TerminalWrite(ttyoring.consume, n); 139 } 140 } 141 if (n > 0) { 142 if (termdata && n) { 143 Dump('>', ttyoring.consume, n); 144 } 145 /* 146 * If we wrote everything, and the full count is 147 * larger than what we wrote, then write the 148 * rest of the buffer. 149 */ 150 if (n1 == n && n0 > n) { 151 n1 = n0 - n; 152 if (!drop) 153 n1 = TerminalWrite(ttyoring.bottom, n1); 154 if (n1 > 0) 155 n += n1; 156 } 157 ring_consumed(&ttyoring, n); 158 } 159 if (n < 0) { 160 if (errno == EAGAIN) 161 return -1; 162 else 163 return -2; 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 */ 178 179 180 int 181 getconnmode(void) 182 { 183 extern int linemode; 184 int mode = 0; 185 #ifdef KLUDGELINEMODE 186 extern int kludgelinemode; 187 #endif 188 189 if (In3270) 190 return(MODE_FLOW); 191 192 if (my_want_state_is_dont(TELOPT_ECHO)) 193 mode |= MODE_ECHO; 194 195 if (localflow) 196 mode |= MODE_FLOW; 197 198 if (my_want_state_is_will(TELOPT_BINARY)) 199 mode |= MODE_INBIN; 200 201 if (his_want_state_is_will(TELOPT_BINARY)) 202 mode |= MODE_OUTBIN; 203 204 #ifdef KLUDGELINEMODE 205 if (kludgelinemode) { 206 if (my_want_state_is_dont(TELOPT_SGA)) { 207 mode |= (MODE_TRAPSIG|MODE_EDIT); 208 if (dontlecho && (clocks.echotoggle > clocks.modenegotiated)) { 209 mode &= ~MODE_ECHO; 210 } 211 } 212 return(mode); 213 } 214 #endif 215 if (my_want_state_is_will(TELOPT_LINEMODE)) 216 mode |= linemode; 217 return(mode); 218 } 219 220 void 221 setconnmode(int force) 222 { 223 #ifdef ENCRYPTION 224 static int enc_passwd = 0; 225 #endif 226 int newmode; 227 228 newmode = getconnmode()|(force?MODE_FORCE:0); 229 230 TerminalNewMode(newmode); 231 232 #ifdef ENCRYPTION 233 if ((newmode & (MODE_ECHO|MODE_EDIT)) == MODE_EDIT) { 234 if (my_want_state_is_will(TELOPT_ENCRYPT) 235 && (enc_passwd == 0) && !encrypt_output) { 236 encrypt_request_start(0, 0); 237 enc_passwd = 1; 238 } 239 } else { 240 if (enc_passwd) { 241 encrypt_request_end(); 242 enc_passwd = 0; 243 } 244 } 245 #endif /* ENCRYPTION */ 246 } 247 248 249 void 250 setcommandmode(void) 251 { 252 TerminalNewMode(-1); 253 } 254