src/bin/network/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
  34 #if 0
  35 #ifndef lint
  36 static const char sccsid[] = "@(#)terminal.c    8.2 (Berkeley) 2/16/95";
  37 #endif
  38 #endif
  39 #include <sys/cdefs.h>
  40 __FBSDID("$FreeBSD: src/contrib/telnet/telnet/terminal.c,v 1.7 2003/05/04 02:54:48 obrien Exp $");
  41
  42 #include <arpa/telnet.h>
  43 #include <sys/types.h>
  44
  45 #include <stdlib.h>
  46
  47 #include "ring.h"
  48
  49 #include "externs.h"
  50 #include "types.h"
  51
  52 #ifdef  ENCRYPTION
  53 #include <libtelnet/encrypt.h>
  54 #endif
  55
  56 Ring            ttyoring, ttyiring;
  57 unsigned char   ttyobuf[2*BUFSIZ], ttyibuf[BUFSIZ];
  58
  59 int termdata;                   /* Debugging flag */
  60
  61 #ifdef  USE_TERMIO
  62 # ifndef VDISCARD
  63 cc_t termFlushChar;
  64 # endif
  65 # ifndef VLNEXT
  66 cc_t termLiteralNextChar;
  67 # endif
  68 # ifndef VSUSP
  69 cc_t termSuspChar;
  70 # endif
  71 # ifndef VWERASE
  72 cc_t termWerasChar;
  73 # endif
  74 # ifndef VREPRINT
  75 cc_t termRprntChar;
  76 # endif
  77 # ifndef VSTART
  78 cc_t termStartChar;
  79 # endif
  80 # ifndef VSTOP
  81 cc_t termStopChar;
  82 # endif
  83 # ifndef VEOL
  84 cc_t termForw1Char;
  85 # endif
  86 # ifndef VEOL2
  87 cc_t termForw2Char;
  88 # endif
  89 # ifndef VSTATUS
  90 cc_t termAytChar;
  91 # endif
  92 #else
  93 cc_t termForw2Char;
  94 cc_t termAytChar;
  95 #endif
  96
  97 /*
  98  * initialize the terminal data structures.
  99  */
 100
 101 void
 102 init_terminal(void)
 103 {
 104     if (ring_init(&ttyoring, ttyobuf, sizeof ttyobuf) != 1) {
 105         exit(1);
 106     }
 107     if (ring_init(&ttyiring, ttyibuf, sizeof ttyibuf) != 1) {
 108         exit(1);
 109     }
 110     autoflush = TerminalAutoFlush();
 111 }
 112
 113 /*
 114  *              Send as much data as possible to the terminal.
 115  *
 116  *              Return value:
 117  *                      -1: No useful work done, data waiting to go out.
 118  *                       0: No data was waiting, so nothing was done.
 119  *                       1: All waiting data was written out.
 120  *                       n: All data - n was written out.
 121  */
 122
 123 int
 124 ttyflush(int drop)
 125 {
 126     int n, n0, n1;
 127
 128     n0 = ring_full_count(&ttyoring);
 129     if ((n1 = n = ring_full_consecutive(&ttyoring)) > 0) {
 130         if (drop) {
 131             TerminalFlushOutput();
 132             /* we leave 'n' alone! */
 133         } else {
 134             n = TerminalWrite(ttyoring.consume, n);
 135         }
 136     }
 137     if (n > 0) {
 138         if (termdata && n) {
 139             Dump('>', ttyoring.consume, n);
 140         }
 141         /*
 142          * If we wrote everything, and the full count is
 143          * larger than what we wrote, then write the
 144          * rest of the buffer.
 145          */
 146         if (n1 == n && n0 > n) {
 147                 n1 = n0 - n;
 148                 if (!drop)
 149                         n1 = TerminalWrite(ttyoring.bottom, n1);
 150                 if (n1 > 0)
 151                         n += n1;
 152         }
 153         ring_consumed(&ttyoring, n);
 154     }
 155     if (n < 0)
 156         return -1;
 157     if (n == n0) {
 158         if (n0)
 159             return -1;
 160         return 0;
 161     }
 162     return n0 - n + 1;
 163 }
 164
 165 \f
 166 /*
 167  * These routines decides on what the mode should be (based on the values
 168  * of various global variables).
 169  */
 170
 171
 172 int
 173 getconnmode(void)
 174 {
 175     extern int linemode;
 176     int mode = 0;
 177 #ifdef  KLUDGELINEMODE
 178     extern int kludgelinemode;
 179 #endif
 180
 181     if (my_want_state_is_dont(TELOPT_ECHO))
 182         mode |= MODE_ECHO;
 183
 184     if (localflow)
 185         mode |= MODE_FLOW;
 186
 187     if (my_want_state_is_will(TELOPT_BINARY))
 188         mode |= MODE_INBIN;
 189
 190     if (his_want_state_is_will(TELOPT_BINARY))
 191         mode |= MODE_OUTBIN;
 192
 193 #ifdef  KLUDGELINEMODE
 194     if (kludgelinemode) {
 195         if (my_want_state_is_dont(TELOPT_SGA)) {
 196             mode |= (MODE_TRAPSIG|MODE_EDIT);
 197             if (dontlecho && (clocks.echotoggle > clocks.modenegotiated)) {
 198                 mode &= ~MODE_ECHO;
 199             }
 200         }
 201         return(mode);
 202     }
 203 #endif
 204     if (my_want_state_is_will(TELOPT_LINEMODE))
 205         mode |= linemode;
 206     return(mode);
 207 }
 208
 209 void
 210 setconnmode(int force)
 211 {
 212 #ifdef  ENCRYPTION
 213     static int enc_passwd = 0;
 214 #endif  /* ENCRYPTION */
 215     int newmode;
 216
 217     newmode = getconnmode()|(force?MODE_FORCE:0);
 218
 219     TerminalNewMode(newmode);
 220
 221 #ifdef  ENCRYPTION
 222     if ((newmode & (MODE_ECHO|MODE_EDIT)) == MODE_EDIT) {
 223         if (my_want_state_is_will(TELOPT_ENCRYPT)
 224                                 && (enc_passwd == 0) && !encrypt_output) {
 225             encrypt_request_start(0, 0);
 226             enc_passwd = 1;
 227         }
 228     } else {
 229         if (enc_passwd) {
 230             encrypt_request_end();
 231             enc_passwd = 0;
 232         }
 233     }
 234 #endif  /* ENCRYPTION */
 235
 236 }
 237
 238 void
 239 setcommandmode(void)
 240 {
 241     TerminalNewMode(-1);
 242 }