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  * $DragonFly: src/crypto/telnet/telnet/terminal.c,v 1.2 2003/06/17 04:24:37 dillon Exp $
  32  */
  33
  34 #include <arpa/telnet.h>
  35 #include <sys/types.h>
  36 #include <stdlib.h>
  37
  38 #include "ring.h"
  39
  40 #include "externs.h"
  41 #include "types.h"
  42
  43 #ifdef  ENCRYPTION
  44 #include <libtelnet/encrypt.h>
  45 #endif
  46
  47 Ring            ttyoring, ttyiring;
  48 unsigned char   ttyobuf[2*BUFSIZ], ttyibuf[BUFSIZ];
  49
  50 int termdata;                   /* Debugging flag */
  51
  52 #ifdef  USE_TERMIO
  53 # ifndef VDISCARD
  54 cc_t termFlushChar;
  55 # endif
  56 # ifndef VLNEXT
  57 cc_t termLiteralNextChar;
  58 # endif
  59 # ifndef VSUSP
  60 cc_t termSuspChar;
  61 # endif
  62 # ifndef VWERASE
  63 cc_t termWerasChar;
  64 # endif
  65 # ifndef VREPRINT
  66 cc_t termRprntChar;
  67 # endif
  68 # ifndef VSTART
  69 cc_t termStartChar;
  70 # endif
  71 # ifndef VSTOP
  72 cc_t termStopChar;
  73 # endif
  74 # ifndef VEOL
  75 cc_t termForw1Char;
  76 # endif
  77 # ifndef VEOL2
  78 cc_t termForw2Char;
  79 # endif
  80 # ifndef VSTATUS
  81 cc_t termAytChar;
  82 # endif
  83 #else
  84 cc_t termForw2Char;
  85 cc_t termAytChar;
  86 #endif
  87
  88 /*
  89  * initialize the terminal data structures.
  90  */
  91
  92 void
  93 init_terminal(void)
  94 {
  95     if (ring_init(&ttyoring, ttyobuf, sizeof ttyobuf) != 1) {
  96         exit(1);
  97     }
  98     if (ring_init(&ttyiring, ttyibuf, sizeof ttyibuf) != 1) {
  99         exit(1);
 100     }
 101     autoflush = TerminalAutoFlush();
 102 }
 103
 104 /*
 105  *              Send as much data as possible to the terminal.
 106  *
 107  *              Return value:
 108  *                      -1: No useful work done, data waiting to go out.
 109  *                       0: No data was waiting, so nothing was done.
 110  *                       1: All waiting data was written out.
 111  *                       n: All data - n was written out.
 112  */
 113
 114 int
 115 ttyflush(int drop)
 116 {
 117     int n, n0, n1;
 118
 119     n0 = ring_full_count(&ttyoring);
 120     if ((n1 = n = ring_full_consecutive(&ttyoring)) > 0) {
 121         if (drop) {
 122             TerminalFlushOutput();
 123             /* we leave 'n' alone! */
 124         } else {
 125             n = TerminalWrite(ttyoring.consume, n);
 126         }
 127     }
 128     if (n > 0) {
 129         if (termdata && n) {
 130             Dump('>', ttyoring.consume, n);
 131         }
 132         /*
 133          * If we wrote everything, and the full count is
 134          * larger than what we wrote, then write the
 135          * rest of the buffer.
 136          */
 137         if (n1 == n && n0 > n) {
 138                 n1 = n0 - n;
 139                 if (!drop)
 140                         n1 = TerminalWrite(ttyoring.bottom, n1);
 141                 if (n1 > 0)
 142                         n += n1;
 143         }
 144         ring_consumed(&ttyoring, n);
 145     }
 146     if (n < 0)
 147         return -1;
 148     if (n == n0) {
 149         if (n0)
 150             return -1;
 151         return 0;
 152     }
 153     return n0 - n + 1;
 154 }
 155
 156 \f
 157 /*
 158  * These routines decides on what the mode should be (based on the values
 159  * of various global variables).
 160  */
 161
 162
 163 int
 164 getconnmode(void)
 165 {
 166     extern int linemode;
 167     int mode = 0;
 168 #ifdef  KLUDGELINEMODE
 169     extern int kludgelinemode;
 170 #endif
 171
 172     if (my_want_state_is_dont(TELOPT_ECHO))
 173         mode |= MODE_ECHO;
 174
 175     if (localflow)
 176         mode |= MODE_FLOW;
 177
 178     if (my_want_state_is_will(TELOPT_BINARY))
 179         mode |= MODE_INBIN;
 180
 181     if (his_want_state_is_will(TELOPT_BINARY))
 182         mode |= MODE_OUTBIN;
 183
 184 #ifdef  KLUDGELINEMODE
 185     if (kludgelinemode) {
 186         if (my_want_state_is_dont(TELOPT_SGA)) {
 187             mode |= (MODE_TRAPSIG|MODE_EDIT);
 188             if (dontlecho && (clocks.echotoggle > clocks.modenegotiated)) {
 189                 mode &= ~MODE_ECHO;
 190             }
 191         }
 192         return(mode);
 193     }
 194 #endif
 195     if (my_want_state_is_will(TELOPT_LINEMODE))
 196         mode |= linemode;
 197     return(mode);
 198 }
 199
 200 void
 201 setconnmode(int force)
 202 {
 203 #ifdef  ENCRYPTION
 204     static int enc_passwd = 0;
 205 #endif  /* ENCRYPTION */
 206     int newmode;
 207
 208     newmode = getconnmode()|(force?MODE_FORCE:0);
 209
 210     TerminalNewMode(newmode);
 211
 212 #ifdef  ENCRYPTION
 213     if ((newmode & (MODE_ECHO|MODE_EDIT)) == MODE_EDIT) {
 214         if (my_want_state_is_will(TELOPT_ENCRYPT)
 215                                 && (enc_passwd == 0) && !encrypt_output) {
 216             encrypt_request_start(0, 0);
 217             enc_passwd = 1;
 218         }
 219     } else {
 220         if (enc_passwd) {
 221             encrypt_request_end();
 222             enc_passwd = 0;
 223         }
 224     }
 225 #endif  /* ENCRYPTION */
 226
 227 }
 228
 229 void
 230 setcommandmode(void)
 231 {
 232     TerminalNewMode(-1);
 233 }