1 /* 2 * Copyright 1994-2002 Sun Microsystems, Inc. All rights reserved. 3 * Use is subject to license terms. 4 */ 5 6 #pragma ident "%Z%%M% %I% %E% SMI" 7 8 /* 9 * usr/src/cmd/cmd-inet/usr.bin/telnet/terminal.c 10 */ 11 12 /* 13 * Copyright (c) 1988, 1990, 1993 14 * The Regents of the University of California. All rights reserved. 15 * 16 * Redistribution and use in source and binary forms, with or without 17 * modification, are permitted provided that the following conditions 18 * are met: 19 * 1. Redistributions of source code must retain the above copyright 20 * notice, this list of conditions and the following disclaimer. 21 * 2. Redistributions in binary form must reproduce the above copyright 22 * notice, this list of conditions and the following disclaimer in the 23 * documentation and/or other materials provided with the distribution. 24 * 3. All advertising materials mentioning features or use of this software 25 * must display the following acknowledgement: 26 * This product includes software developed by the University of 27 * California, Berkeley and its contributors. 28 * 4. Neither the name of the University nor the names of its contributors 29 * may be used to endorse or promote products derived from this software 30 * without specific prior written permission. 31 * 32 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 33 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 34 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 35 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 36 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 40 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 41 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 42 * SUCH DAMAGE. 43 */ 44 45 #ifndef lint 46 static char sccsid[] = "@(#)terminal.c 8.1 (Berkeley) 6/6/93"; 47 #endif /* not lint */ 48 49 #include <arpa/telnet.h> 50 #include <sys/types.h> 51 #include <errno.h> 52 53 #include "ring.h" 54 55 #include "externs.h" 56 #include "types.h" 57 58 Ring ttyoring; 59 Ring ttyiring; 60 static unsigned char ttyobuf[2*BUFSIZ]; 61 static unsigned char ttyibuf[BUFSIZ]; 62 63 int termdata; /* Debugging flag */ 64 65 #ifdef USE_TERMIO 66 cc_t termAytChar; 67 #else 68 cc_t termForw2Char; 69 cc_t termAytChar; 70 #endif 71 72 /* 73 * initialize the terminal data structures. 74 */ 75 76 void 77 init_terminal() 78 { 79 if (ring_init(&ttyoring, ttyobuf, sizeof (ttyobuf)) != 1) { 80 exit(1); 81 } 82 if (ring_init(&ttyiring, ttyibuf, sizeof (ttyibuf)) != 1) { 83 exit(1); 84 } 85 autoflush = 1; 86 } 87 88 89 /* 90 * Send as much data as possible to the terminal. 91 * 92 * Return value: 93 * -2: Error occurred other than EWOULDBLOCK; see 94 * 'errno' for specifics 95 * -1: No useful work done, although data was waiting. 96 * This may be due to EWOULDBLOCK error. 97 * 0: No data was waiting, so nothing was done. 98 * 1: All waiting data was written out. 99 * n: Part of data was written. 'n' is the number 100 * of bytes remaining which were not written. 101 */ 102 103 int 104 ttyflush(drop) 105 int drop; 106 { 107 register int n, n0, n1; 108 109 n0 = ring_full_count(&ttyoring); 110 if ((n1 = n = ring_full_consecutive(&ttyoring)) > 0) { 111 if (drop) { 112 TerminalFlushOutput(); 113 /* we leave 'n' alone! */ 114 } else { 115 n = TerminalWrite((char *)ttyoring.consume, n); 116 if (n == -1 && errno != EWOULDBLOCK) 117 return (-2); 118 } 119 } 120 if (n > 0) { 121 if (termdata && n) { 122 Dump('>', ttyoring.consume, n); 123 } 124 /* 125 * If we wrote everything, and the full count is 126 * larger than what we wrote, then write the 127 * rest of the buffer. 128 */ 129 if (n1 == n && n0 > n) { 130 n1 = n0 - n; 131 if (!drop) { 132 n1 = TerminalWrite((char *)ttyoring.bottom, n1); 133 if (n1 == -1) { 134 if (errno != EWOULDBLOCK) 135 return (-2); 136 n1 = 0; 137 } 138 } 139 n += n1; 140 } 141 ring_consumed(&ttyoring, n); 142 } 143 if (n < 0) 144 return (-1); 145 146 if (n == n0) { 147 if (n0) 148 return (-1); 149 return (0); 150 } 151 return (n0 - n + 1); 152 } 153 154 155 /* 156 * These routines decides on what the mode should be (based on the values 157 * of various global variables). 158 */ 159 160 161 int 162 getconnmode() 163 { 164 extern int linemode; 165 int mode = 0; 166 #ifdef KLUDGELINEMODE 167 extern int kludgelinemode; 168 #endif 169 170 if (my_want_state_is_dont(TELOPT_ECHO)) 171 mode |= MODE_ECHO; 172 173 if (localflow) 174 mode |= MODE_FLOW; 175 176 if (my_want_state_is_will(TELOPT_BINARY)) 177 mode |= MODE_INBIN; 178 179 if (my_want_state_is_do(TELOPT_BINARY)) 180 mode |= MODE_OUTBIN; 181 182 #ifdef KLUDGELINEMODE 183 if (kludgelinemode) { 184 if (my_want_state_is_dont(TELOPT_SGA)) { 185 mode |= (MODE_TRAPSIG|MODE_EDIT); 186 if (dontlecho && 187 (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(force) 201 int force; 202 { 203 static int enc_passwd = 0; 204 register int newmode; 205 206 newmode = getconnmode()|(force?MODE_FORCE:0); 207 208 TerminalNewMode(newmode); 209 210 if ((newmode & (MODE_ECHO|MODE_EDIT)) == MODE_EDIT) { 211 if (my_want_state_is_will(TELOPT_ENCRYPT) && 212 (enc_passwd == 0) && !encrypt_output) { 213 encrypt_request_start(0, 0); 214 enc_passwd = 1; 215 } 216 } else { 217 if (enc_passwd) { 218 encrypt_request_end(); 219 enc_passwd = 0; 220 } 221 } 222 } 223 224 225 void 226 setcommandmode() 227 { 228 TerminalNewMode(-1); 229 } 230