crypto/telnet/telnet/terminal.c

   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  * @(#)terminal.c       8.2 (Berkeley) 2/16/95
  34  * $FreeBSD: src/crypto/telnet/telnet/terminal.c,v 1.2.8.2 2002/04/13 10:59:08 markm Exp $
  35  * $DragonFly: src/crypto/telnet/telnet/terminal.c,v 1.2 2003/06/17 04:24:37 dillon Exp $
  36  */
  37
  38 #include <arpa/telnet.h>
  39 #include <sys/types.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.
 109  *
 110  *              Return value:
 111  *                      -1: No useful work done, data waiting to go out.
 112  *                       0: No data was waiting, so nothing was done.
 113  *                       1: All waiting data was written out.
 114  *                       n: All data - n was written out.
 115  */
 116
 117 int
 118 ttyflush(int drop)
 119 {
 120     int n, n0, n1;
 121
 122     n0 = ring_full_count(&ttyoring);
 123     if ((n1 = n = ring_full_consecutive(&ttyoring)) > 0) {
 124         if (drop) {
 125             TerminalFlushOutput();
 126             /* we leave 'n' alone! */
 127         } else {
 128             n = TerminalWrite(ttyoring.consume, n);
 129         }
 130     }
 131     if (n > 0) {
 132         if (termdata && n) {
 133             Dump('>', ttyoring.consume, n);
 134         }
 135         /*
 136          * If we wrote everything, and the full count is
 137          * larger than what we wrote, then write the
 138          * rest of the buffer.
 139          */
 140         if (n1 == n && n0 > n) {
 141                 n1 = n0 - n;
 142                 if (!drop)
 143                         n1 = TerminalWrite(ttyoring.bottom, n1);
 144                 if (n1 > 0)
 145                         n += n1;
 146         }
 147         ring_consumed(&ttyoring, n);
 148     }
 149     if (n < 0)
 150         return -1;
 151     if (n == n0) {
 152         if (n0)
 153             return -1;
 154         return 0;
 155     }
 156     return n0 - n + 1;
 157 }
 158
 159 \f
 160 /*
 161  * These routines decides on what the mode should be (based on the values
 162  * of various global variables).
 163  */
 164
 165
 166 int
 167 getconnmode(void)
 168 {
 169     extern int linemode;
 170     int mode = 0;
 171 #ifdef  KLUDGELINEMODE
 172     extern int kludgelinemode;
 173 #endif
 174
 175     if (my_want_state_is_dont(TELOPT_ECHO))
 176         mode |= MODE_ECHO;
 177
 178     if (localflow)
 179         mode |= MODE_FLOW;
 180
 181     if (my_want_state_is_will(TELOPT_BINARY))
 182         mode |= MODE_INBIN;
 183
 184     if (his_want_state_is_will(TELOPT_BINARY))
 185         mode |= MODE_OUTBIN;
 186
 187 #ifdef  KLUDGELINEMODE
 188     if (kludgelinemode) {
 189         if (my_want_state_is_dont(TELOPT_SGA)) {
 190             mode |= (MODE_TRAPSIG|MODE_EDIT);
 191             if (dontlecho && (clocks.echotoggle > clocks.modenegotiated)) {
 192                 mode &= ~MODE_ECHO;
 193             }
 194         }
 195         return(mode);
 196     }
 197 #endif
 198     if (my_want_state_is_will(TELOPT_LINEMODE))
 199         mode |= linemode;
 200     return(mode);
 201 }
 202
 203 void
 204 setconnmode(int force)
 205 {
 206 #ifdef  ENCRYPTION
 207     static int enc_passwd = 0;
 208 #endif  /* ENCRYPTION */
 209     int newmode;
 210
 211     newmode = getconnmode()|(force?MODE_FORCE:0);
 212
 213     TerminalNewMode(newmode);
 214
 215 #ifdef  ENCRYPTION
 216     if ((newmode & (MODE_ECHO|MODE_EDIT)) == MODE_EDIT) {
 217         if (my_want_state_is_will(TELOPT_ENCRYPT)
 218                                 && (enc_passwd == 0) && !encrypt_output) {
 219             encrypt_request_start(0, 0);
 220             enc_passwd = 1;
 221         }
 222     } else {
 223         if (enc_passwd) {
 224             encrypt_request_end();
 225             enc_passwd = 0;
 226         }
 227     }
 228 #endif  /* ENCRYPTION */
 229
 230 }
 231
 232 void
 233 setcommandmode(void)
 234 {
 235     TerminalNewMode(-1);
 236 }