1 /* 2 * Copyright 1994-2002 Sun Microsystems, Inc. All rights reserved. 3 * Use is subject to license terms. 4 */ 5 6 /* 7 * usr/src/cmd/cmd-inet/usr.bin/telnet/terminal.c 8 */ 9 10 /* 11 * Copyright (c) 1988, 1990, 1993 12 * The Regents of the University of California. All rights reserved. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 3. All advertising materials mentioning features or use of this software 23 * must display the following acknowledgement: 24 * This product includes software developed by the University of 25 * California, Berkeley and its contributors. 26 * 4. Neither the name of the University nor the names of its contributors 27 * may be used to endorse or promote products derived from this software 28 * without specific prior written permission. 29 * 30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 31 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 32 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 33 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 34 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 40 * SUCH DAMAGE. 41 */ 42 43 #ifndef lint 44 static char sccsid[] = "@(#)terminal.c 8.1 (Berkeley) 6/6/93"; 45 #endif /* not lint */ 46 47 #include <arpa/telnet.h> 48 #include <sys/types.h> 49 #include <errno.h> 50 51 #include "ring.h" 52 53 #include "externs.h" 54 #include "types.h" 55 56 Ring ttyoring; 57 Ring ttyiring; 58 static unsigned char ttyobuf[2*BUFSIZ]; 59 static unsigned char ttyibuf[BUFSIZ]; 60 61 int termdata; /* Debugging flag */ 62 63 #ifdef USE_TERMIO 64 cc_t termAytChar; 65 #else 66 cc_t termForw2Char; 67 cc_t termAytChar; 68 #endif 69 70 /* 71 * initialize the terminal data structures. 72 */ 73 74 void 75 init_terminal() 76 { 77 if (ring_init(&ttyoring, ttyobuf, sizeof (ttyobuf)) != 1) { 78 exit(1); 79 } 80 if (ring_init(&ttyiring, ttyibuf, sizeof (ttyibuf)) != 1) { 81 exit(1); 82 } 83 autoflush = 1; 84 } 85 86 87 /* 88 * Send as much data as possible to the terminal. 89 * 90 * Return value: 91 * -2: Error occurred other than EWOULDBLOCK; see 92 * 'errno' for specifics 93 * -1: No useful work done, although data was waiting. 94 * This may be due to EWOULDBLOCK error. 95 * 0: No data was waiting, so nothing was done. 96 * 1: All waiting data was written out. 97 * n: Part of data was written. 'n' is the number 98 * of bytes remaining which were not written. 99 */ 100 101 int 102 ttyflush(drop) 103 int drop; 104 { 105 register int n, n0, n1; 106 107 n0 = ring_full_count(&ttyoring); 108 if ((n1 = n = ring_full_consecutive(&ttyoring)) > 0) { 109 if (drop) { 110 TerminalFlushOutput(); 111 /* we leave 'n' alone! */ 112 } else { 113 n = TerminalWrite((char *)ttyoring.consume, n); 114 if (n == -1 && errno != EWOULDBLOCK) 115 return (-2); 116 } 117 } 118 if (n > 0) { 119 if (termdata && n) { 120 Dump('>', ttyoring.consume, n); 121 } 122 /* 123 * If we wrote everything, and the full count is 124 * larger than what we wrote, then write the 125 * rest of the buffer. 126 */ 127 if (n1 == n && n0 > n) { 128 n1 = n0 - n; 129 if (!drop) { 130 n1 = TerminalWrite((char *)ttyoring.bottom, n1); 131 if (n1 == -1) { 132 if (errno != EWOULDBLOCK) 133 return (-2); 134 n1 = 0; 135 } 136 } 137 n += n1; 138 } 139 ring_consumed(&ttyoring, n); 140 } 141 if (n < 0) 142 return (-1); 143 144 if (n == n0) { 145 if (n0) 146 return (-1); 147 return (0); 148 } 149 return (n0 - n + 1); 150 } 151 152 153 /* 154 * These routines decides on what the mode should be (based on the values 155 * of various global variables). 156 */ 157 158 159 int 160 getconnmode() 161 { 162 extern int linemode; 163 int mode = 0; 164 #ifdef KLUDGELINEMODE 165 extern int kludgelinemode; 166 #endif 167 168 if (my_want_state_is_dont(TELOPT_ECHO)) 169 mode |= MODE_ECHO; 170 171 if (localflow) 172 mode |= MODE_FLOW; 173 174 if (my_want_state_is_will(TELOPT_BINARY)) 175 mode |= MODE_INBIN; 176 177 if (my_want_state_is_do(TELOPT_BINARY)) 178 mode |= MODE_OUTBIN; 179 180 #ifdef KLUDGELINEMODE 181 if (kludgelinemode) { 182 if (my_want_state_is_dont(TELOPT_SGA)) { 183 mode |= (MODE_TRAPSIG|MODE_EDIT); 184 if (dontlecho && 185 (clocks.echotoggle > clocks.modenegotiated)) { 186 mode &= ~MODE_ECHO; 187 } 188 } 189 return (mode); 190 } 191 #endif 192 if (my_want_state_is_will(TELOPT_LINEMODE)) 193 mode |= linemode; 194 return (mode); 195 } 196 197 void 198 setconnmode(force) 199 int force; 200 { 201 static int enc_passwd = 0; 202 register int newmode; 203 204 newmode = getconnmode()|(force?MODE_FORCE:0); 205 206 TerminalNewMode(newmode); 207 208 if ((newmode & (MODE_ECHO|MODE_EDIT)) == MODE_EDIT) { 209 if (my_want_state_is_will(TELOPT_ENCRYPT) && 210 (enc_passwd == 0) && !encrypt_output) { 211 encrypt_request_start(0, 0); 212 enc_passwd = 1; 213 } 214 } else { 215 if (enc_passwd) { 216 encrypt_request_end(); 217 enc_passwd = 0; 218 } 219 } 220 } 221 222 223 void 224 setcommandmode() 225 { 226 TerminalNewMode(-1); 227 } 228