usr.bin/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 #include <stdlib.h>
  41
  42 #include "ring.h"
  43
  44 #include "externs.h"
  45 #include "types.h"
  46
  47 #ifdef  ENCRYPTION
  48 #include <libtelnet/encrypt.h>
  49 #endif
  50
  51 Ring            ttyoring, ttyiring;
  52 unsigned char   ttyobuf[2*BUFSIZ], ttyibuf[BUFSIZ];
  53
  54 int termdata;                   /* Debugging flag */
  55
  56 #ifdef  USE_TERMIO
  57 # ifndef VDISCARD
  58 cc_t termFlushChar;
  59 # endif
  60 # ifndef VLNEXT
  61 cc_t termLiteralNextChar;
  62 # endif
  63 # ifndef VSUSP
  64 cc_t termSuspChar;
  65 # endif
  66 # ifndef VWERASE
  67 cc_t termWerasChar;
  68 # endif
  69 # ifndef VREPRINT
  70 cc_t termRprntChar;
  71 # endif
  72 # ifndef VSTART
  73 cc_t termStartChar;
  74 # endif
  75 # ifndef VSTOP
  76 cc_t termStopChar;
  77 # endif
  78 # ifndef VEOL
  79 cc_t termForw1Char;
  80 # endif
  81 # ifndef VEOL2
  82 cc_t termForw2Char;
  83 # endif
  84 # ifndef VSTATUS
  85 cc_t termAytChar;
  86 # endif
  87 #else
  88 cc_t termForw2Char;
  89 cc_t termAytChar;
  90 #endif
  91
  92 /*
  93  * initialize the terminal data structures.
  94  */
  95
  96 void
  97 init_terminal(void)
  98 {
  99     if (ring_init(&ttyoring, ttyobuf, sizeof ttyobuf) != 1) {
 100         exit(1);
 101     }
 102     if (ring_init(&ttyiring, ttyibuf, sizeof ttyibuf) != 1) {
 103         exit(1);
 104     }
 105     autoflush = TerminalAutoFlush();
 106 }
 107
 108 /*
 109  *              Send as much data as possible to the terminal.
 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         return -1;
 152     if (n == n0) {
 153         if (n0)
 154             return -1;
 155         return 0;
 156     }
 157     return n0 - n + 1;
 158 }
 159
 160 \f
 161 /*
 162  * These routines decides on what the mode should be (based on the values
 163  * of various global variables).
 164  */
 165
 166
 167 int
 168 getconnmode(void)
 169 {
 170     extern int linemode;
 171     int mode = 0;
 172 #ifdef  KLUDGELINEMODE
 173     extern int kludgelinemode;
 174 #endif
 175
 176     if (my_want_state_is_dont(TELOPT_ECHO))
 177         mode |= MODE_ECHO;
 178
 179     if (localflow)
 180         mode |= MODE_FLOW;
 181
 182     if (my_want_state_is_will(TELOPT_BINARY))
 183         mode |= MODE_INBIN;
 184
 185     if (his_want_state_is_will(TELOPT_BINARY))
 186         mode |= MODE_OUTBIN;
 187
 188 #ifdef  KLUDGELINEMODE
 189     if (kludgelinemode) {
 190         if (my_want_state_is_dont(TELOPT_SGA)) {
 191             mode |= (MODE_TRAPSIG|MODE_EDIT);
 192             if (dontlecho && (clocks.echotoggle > clocks.modenegotiated)) {
 193                 mode &= ~MODE_ECHO;
 194             }
 195         }
 196         return(mode);
 197     }
 198 #endif
 199     if (my_want_state_is_will(TELOPT_LINEMODE))
 200         mode |= linemode;
 201     return(mode);
 202 }
 203
 204 void
 205 setconnmode(int force)
 206 {
 207 #ifdef  ENCRYPTION
 208     static int enc_passwd = 0;
 209 #endif  /* ENCRYPTION */
 210     int newmode;
 211
 212     newmode = getconnmode()|(force?MODE_FORCE:0);
 213
 214     TerminalNewMode(newmode);
 215
 216 #ifdef  ENCRYPTION
 217     if ((newmode & (MODE_ECHO|MODE_EDIT)) == MODE_EDIT) {
 218         if (my_want_state_is_will(TELOPT_ENCRYPT)
 219                                 && (enc_passwd == 0) && !encrypt_output) {
 220             encrypt_request_start(0, 0);
 221             enc_passwd = 1;
 222         }
 223     } else {
 224         if (enc_passwd) {
 225             encrypt_request_end();
 226             enc_passwd = 0;
 227         }
 228     }
 229 #endif  /* ENCRYPTION */
 230
 231 }
 232
 233 void
 234 setcommandmode(void)
 235 {
 236     TerminalNewMode(-1);
 237 }