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 30 #if 0 31 #ifndef lint 32 static const char sccsid[] = "@(#)terminal.c 8.2 (Berkeley) 2/16/95"; 33 #endif 34 #endif 35 36 #include <arpa/telnet.h> 37 #include <sys/types.h> 38 39 #include <stdlib.h> 40 41 #include "ring.h" 42 43 #include "externs.h" 44 #include "types.h" 45 46 #ifdef ENCRYPTION 47 #include <libtelnet/encrypt.h> 48 #endif 49 50 Ring ttyoring, ttyiring; 51 unsigned char ttyobuf[2*BUFSIZ], ttyibuf[BUFSIZ]; 52 53 int termdata; /* Debugging flag */ 54 55 #ifdef USE_TERMIO 56 # ifndef VDISCARD 57 cc_t termFlushChar; 58 # endif 59 # ifndef VLNEXT 60 cc_t termLiteralNextChar; 61 # endif 62 # ifndef VSUSP 63 cc_t termSuspChar; 64 # endif 65 # ifndef VWERASE 66 cc_t termWerasChar; 67 # endif 68 # ifndef VREPRINT 69 cc_t termRprntChar; 70 # endif 71 # ifndef VSTART 72 cc_t termStartChar; 73 # endif 74 # ifndef VSTOP 75 cc_t termStopChar; 76 # endif 77 # ifndef VEOL 78 cc_t termForw1Char; 79 # endif 80 # ifndef VEOL2 81 cc_t termForw2Char; 82 # endif 83 # ifndef VSTATUS 84 cc_t termAytChar; 85 # endif 86 #else 87 cc_t termForw2Char; 88 cc_t termAytChar; 89 #endif 90 91 /* 92 * initialize the terminal data structures. 93 */ 94 95 void 96 init_terminal(void) 97 { 98 if (ring_init(&ttyoring, ttyobuf, sizeof ttyobuf) != 1) { 99 exit(1); 100 } 101 if (ring_init(&ttyiring, ttyibuf, sizeof ttyibuf) != 1) { 102 exit(1); 103 } 104 autoflush = TerminalAutoFlush(); 105 } 106 107 /* 108 * Send as much data as possible to the terminal, else exits if 109 * it encounters a permanent failure when writing to the tty. 110 * 111 * Return value: 112 * -1: No useful work done, data waiting to go out. 113 * 0: No data was waiting, so nothing was done. 114 * 1: All waiting data was written out. 115 * n: All data - n was written out. 116 */ 117 118 int 119 ttyflush(int drop) 120 { 121 int n, n0, n1; 122 123 n0 = ring_full_count(&ttyoring); 124 if ((n1 = n = ring_full_consecutive(&ttyoring)) > 0) { 125 if (drop) { 126 TerminalFlushOutput(); 127 /* we leave 'n' alone! */ 128 } else { 129 n = TerminalWrite(ttyoring.consume, n); 130 } 131 } 132 if (n > 0) { 133 if (termdata && n) { 134 Dump('>', ttyoring.consume, n); 135 } 136 /* 137 * If we wrote everything, and the full count is 138 * larger than what we wrote, then write the 139 * rest of the buffer. 140 */ 141 if (n1 == n && n0 > n) { 142 n1 = n0 - n; 143 if (!drop) 144 n1 = TerminalWrite(ttyoring.bottom, n1); 145 if (n1 > 0) 146 n += n1; 147 } 148 ring_consumed(&ttyoring, n); 149 } 150 if (n < 0) { 151 if (errno == EAGAIN || errno == EINTR) { 152 return -1; 153 } else { 154 ring_consumed(&ttyoring, ring_full_count(&ttyoring)); 155 setconnmode(0); 156 setcommandmode(); 157 NetClose(net); 158 fprintf(stderr, "Write error on local output.\n"); 159 exit(1); 160 } 161 return -1; 162 } 163 if (n == n0) { 164 if (n0) 165 return -1; 166 return 0; 167 } 168 return n0 - n + 1; 169 } 170 171 172 /* 173 * These routines decides on what the mode should be (based on the values 174 * of various global variables). 175 */ 176 177 178 int 179 getconnmode(void) 180 { 181 extern int linemode; 182 int mode = 0; 183 #ifdef KLUDGELINEMODE 184 extern int kludgelinemode; 185 #endif 186 187 if (my_want_state_is_dont(TELOPT_ECHO)) 188 mode |= MODE_ECHO; 189 190 if (localflow) 191 mode |= MODE_FLOW; 192 193 if (my_want_state_is_will(TELOPT_BINARY)) 194 mode |= MODE_INBIN; 195 196 if (his_want_state_is_will(TELOPT_BINARY)) 197 mode |= MODE_OUTBIN; 198 199 #ifdef KLUDGELINEMODE 200 if (kludgelinemode) { 201 if (my_want_state_is_dont(TELOPT_SGA)) { 202 mode |= (MODE_TRAPSIG|MODE_EDIT); 203 if (dontlecho && (clocks.echotoggle > clocks.modenegotiated)) { 204 mode &= ~MODE_ECHO; 205 } 206 } 207 return(mode); 208 } 209 #endif 210 if (my_want_state_is_will(TELOPT_LINEMODE)) 211 mode |= linemode; 212 return(mode); 213 } 214 215 void 216 setconnmode(int force) 217 { 218 #ifdef ENCRYPTION 219 static int enc_passwd = 0; 220 #endif /* ENCRYPTION */ 221 int newmode; 222 223 newmode = getconnmode()|(force?MODE_FORCE:0); 224 225 TerminalNewMode(newmode); 226 227 #ifdef ENCRYPTION 228 if ((newmode & (MODE_ECHO|MODE_EDIT)) == MODE_EDIT) { 229 if (my_want_state_is_will(TELOPT_ENCRYPT) 230 && (enc_passwd == 0) && !encrypt_output) { 231 encrypt_request_start(0, 0); 232 enc_passwd = 1; 233 } 234 } else { 235 if (enc_passwd) { 236 encrypt_request_end(); 237 enc_passwd = 0; 238 } 239 } 240 #endif /* ENCRYPTION */ 241 242 } 243 244 void 245 setcommandmode(void) 246 { 247 TerminalNewMode(-1); 248 } 249