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. 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  * @(#)terminal.c       8.2 (Berkeley) 2/16/95
  30  * $FreeBSD: src/crypto/telnet/telnet/terminal.c,v 1.2.8.2 2002/04/13 10:59:08 markm Exp $
  31  */
  32
  33 #include <arpa/telnet.h>
  34 #include <sys/types.h>
  35 #include <stdlib.h>
  36
  37 #include "ring.h"
  38
  39 #include "externs.h"
  40 #include "types.h"
  41
  42 #ifdef  ENCRYPTION
  43 #include <libtelnet/encrypt.h>
  44 #endif
  45
  46 Ring            ttyoring, ttyiring;
  47 unsigned char   ttyobuf[2*BUFSIZ], ttyibuf[BUFSIZ];
  48
  49 int termdata;                   /* Debugging flag */
  50
  51 #ifdef  USE_TERMIO
  52 # ifndef VDISCARD
  53 cc_t termFlushChar;
  54 # endif
  55 # ifndef VLNEXT
  56 cc_t termLiteralNextChar;
  57 # endif
  58 # ifndef VSUSP
  59 cc_t termSuspChar;
  60 # endif
  61 # ifndef VWERASE
  62 cc_t termWerasChar;
  63 # endif
  64 # ifndef VREPRINT
  65 cc_t termRprntChar;
  66 # endif
  67 # ifndef VSTART
  68 cc_t termStartChar;
  69 # endif
  70 # ifndef VSTOP
  71 cc_t termStopChar;
  72 # endif
  73 # ifndef VEOL
  74 cc_t termForw1Char;
  75 # endif
  76 # ifndef VEOL2
  77 cc_t termForw2Char;
  78 # endif
  79 # ifndef VSTATUS
  80 cc_t termAytChar;
  81 # endif
  82 #else
  83 cc_t termForw2Char;
  84 cc_t termAytChar;
  85 #endif
  86
  87 /*
  88  * initialize the terminal data structures.
  89  */
  90
  91 void
  92 init_terminal(void)
  93 {
  94     if (ring_init(&ttyoring, ttyobuf, sizeof ttyobuf) != 1) {
  95         exit(1);
  96     }
  97     if (ring_init(&ttyiring, ttyibuf, sizeof ttyibuf) != 1) {
  98         exit(1);
  99     }
 100     autoflush = TerminalAutoFlush();
 101 }
 102
 103 /*
 104  *              Send as much data as possible to the terminal.
 105  *
 106  *              Return value:
 107  *                      -1: No useful work done, data waiting to go out.
 108  *                       0: No data was waiting, so nothing was done.
 109  *                       1: All waiting data was written out.
 110  *                       n: All data - n was written out.
 111  */
 112
 113 int
 114 ttyflush(int drop)
 115 {
 116     int n, n0, n1;
 117
 118     n0 = ring_full_count(&ttyoring);
 119     if ((n1 = n = ring_full_consecutive(&ttyoring)) > 0) {
 120         if (drop) {
 121             TerminalFlushOutput();
 122             /* we leave 'n' alone! */
 123         } else {
 124             n = TerminalWrite(ttyoring.consume, n);
 125         }
 126     }
 127     if (n > 0) {
 128         if (termdata && n) {
 129             Dump('>', ttyoring.consume, n);
 130         }
 131         /*
 132          * If we wrote everything, and the full count is
 133          * larger than what we wrote, then write the
 134          * rest of the buffer.
 135          */
 136         if (n1 == n && n0 > n) {
 137                 n1 = n0 - n;
 138                 if (!drop)
 139                         n1 = TerminalWrite(ttyoring.bottom, n1);
 140                 if (n1 > 0)
 141                         n += n1;
 142         }
 143         ring_consumed(&ttyoring, n);
 144     }
 145     if (n < 0)
 146         return -1;
 147     if (n == n0) {
 148         if (n0)
 149             return -1;
 150         return 0;
 151     }
 152     return n0 - n + 1;
 153 }
 154
 155
 156 /*
 157  * These routines decides on what the mode should be (based on the values
 158  * of various global variables).
 159  */
 160
 161
 162 int
 163 getconnmode(void)
 164 {
 165     extern int linemode;
 166     int mode = 0;
 167 #ifdef  KLUDGELINEMODE
 168     extern int kludgelinemode;
 169 #endif
 170
 171     if (my_want_state_is_dont(TELOPT_ECHO))
 172         mode |= MODE_ECHO;
 173
 174     if (localflow)
 175         mode |= MODE_FLOW;
 176
 177     if (my_want_state_is_will(TELOPT_BINARY))
 178         mode |= MODE_INBIN;
 179
 180     if (his_want_state_is_will(TELOPT_BINARY))
 181         mode |= MODE_OUTBIN;
 182
 183 #ifdef  KLUDGELINEMODE
 184     if (kludgelinemode) {
 185         if (my_want_state_is_dont(TELOPT_SGA)) {
 186             mode |= (MODE_TRAPSIG|MODE_EDIT);
 187             if (dontlecho && (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(int force)
 201 {
 202 #ifdef  ENCRYPTION
 203     static int enc_passwd = 0;
 204 #endif  /* ENCRYPTION */
 205     int newmode;
 206
 207     newmode = getconnmode()|(force?MODE_FORCE:0);
 208
 209     TerminalNewMode(newmode);
 210
 211 #ifdef  ENCRYPTION
 212     if ((newmode & (MODE_ECHO|MODE_EDIT)) == MODE_EDIT) {
 213         if (my_want_state_is_will(TELOPT_ENCRYPT)
 214                                 && (enc_passwd == 0) && !encrypt_output) {
 215             encrypt_request_start(0, 0);
 216             enc_passwd = 1;
 217         }
 218     } else {
 219         if (enc_passwd) {
 220             encrypt_request_end();
 221             enc_passwd = 0;
 222         }
 223     }
 224 #endif  /* ENCRYPTION */
 225
 226 }
 227
 228 void
 229 setcommandmode(void)
 230 {
 231     TerminalNewMode(-1);
 232 }