usr/src/cmd/cmd-inet/usr.bin/telnet/terminal.c

   1 /*
   2  * Copyright 1994-2002 Sun Microsystems, Inc.  All rights reserved.
   3  * Use is subject to license terms.
   4  */
   5
   6 #pragma ident   "%Z%%M% %I%     %E% SMI"
   7
   8 /*
   9  * usr/src/cmd/cmd-inet/usr.bin/telnet/terminal.c
  10  */
  11
  12 /*
  13  * Copyright (c) 1988, 1990, 1993
  14  *      The Regents of the University of California.  All rights reserved.
  15  *
  16  * Redistribution and use in source and binary forms, with or without
  17  * modification, are permitted provided that the following conditions
  18  * are met:
  19  * 1. Redistributions of source code must retain the above copyright
  20  *    notice, this list of conditions and the following disclaimer.
  21  * 2. Redistributions in binary form must reproduce the above copyright
  22  *    notice, this list of conditions and the following disclaimer in the
  23  *    documentation and/or other materials provided with the distribution.
  24  * 3. All advertising materials mentioning features or use of this software
  25  *    must display the following acknowledgement:
  26  *      This product includes software developed by the University of
  27  *      California, Berkeley and its contributors.
  28  * 4. Neither the name of the University nor the names of its contributors
  29  *    may be used to endorse or promote products derived from this software
  30  *    without specific prior written permission.
  31  *
  32  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  33  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  34  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  35  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  36  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  40  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  41  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  42  * SUCH DAMAGE.
  43  */
  44
  45 static char sccsid[] = "@(#)terminal.c  8.1 (Berkeley) 6/6/93";
  46
  47 #include <arpa/telnet.h>
  48 #include <sys/types.h>
  49 #include <errno.h>
  50
  51 #include "ring.h"
  52
  53 #include "externs.h"
  54 #include "types.h"
  55
  56 Ring    ttyoring;
  57 Ring    ttyiring;
  58 static unsigned char ttyobuf[2*BUFSIZ];
  59 static unsigned char ttyibuf[BUFSIZ];
  60
  61 int termdata;                   /* Debugging flag */
  62
  63 #ifdef  USE_TERMIO
  64 cc_t termAytChar;
  65 #else
  66 cc_t termForw2Char;
  67 cc_t termAytChar;
  68 #endif
  69
  70 /*
  71  * initialize the terminal data structures.
  72  */
  73
  74     void
  75 init_terminal()
  76 {
  77         if (ring_init(&ttyoring, ttyobuf, sizeof (ttyobuf)) != 1) {
  78                 exit(1);
  79         }
  80         if (ring_init(&ttyiring, ttyibuf, sizeof (ttyibuf)) != 1) {
  81                 exit(1);
  82         }
  83         autoflush = 1;
  84 }
  85
  86
  87 /*
  88  *              Send as much data as possible to the terminal.
  89  *
  90  *              Return value:
  91  *                      -2: Error occurred other than EWOULDBLOCK; see
  92  *                          'errno' for specifics
  93  *                      -1: No useful work done, although data was waiting.
  94  *                          This may be due to EWOULDBLOCK error.
  95  *                       0: No data was waiting, so nothing was done.
  96  *                       1: All waiting data was written out.
  97  *                       n: Part of data was written.  'n' is the number
  98  *                          of bytes remaining which were not written.
  99  */
 100
 101 int
 102 ttyflush(drop)
 103         int drop;
 104 {
 105         register int n, n0, n1;
 106
 107         n0 = ring_full_count(&ttyoring);
 108         if ((n1 = n = ring_full_consecutive(&ttyoring)) > 0) {
 109                 if (drop) {
 110                         TerminalFlushOutput();
 111                         /* we leave 'n' alone! */
 112                 } else {
 113                         n = TerminalWrite((char *)ttyoring.consume, n);
 114                         if (n == -1 && errno != EWOULDBLOCK)
 115                                 return (-2);
 116                 }
 117         }
 118         if (n > 0) {
 119                 if (termdata && n) {
 120                         Dump('>', ttyoring.consume, n);
 121                 }
 122                 /*
 123                  * If we wrote everything, and the full count is
 124                  * larger than what we wrote, then write the
 125                  * rest of the buffer.
 126                  */
 127                 if (n1 == n && n0 > n) {
 128                         n1 = n0 - n;
 129                         if (!drop) {
 130                                 n1 = TerminalWrite((char *)ttyoring.bottom, n1);
 131                                 if (n1 == -1) {
 132                                         if (errno != EWOULDBLOCK)
 133                                                 return (-2);
 134                                         n1 = 0;
 135                                 }
 136                         }
 137                         n += n1;
 138                 }
 139                 ring_consumed(&ttyoring, n);
 140         }
 141         if (n < 0)
 142                 return (-1);
 143
 144         if (n == n0) {
 145                 if (n0)
 146                         return (-1);
 147                 return (0);
 148         }
 149         return (n0 - n + 1);
 150 }
 151
 152
 153 /*
 154  * These routines decides on what the mode should be (based on the values
 155  * of various global variables).
 156  */
 157
 158
 159 int
 160 getconnmode()
 161 {
 162         extern int linemode;
 163         int mode = 0;
 164 #ifdef  KLUDGELINEMODE
 165         extern int kludgelinemode;
 166 #endif
 167
 168         if (my_want_state_is_dont(TELOPT_ECHO))
 169                 mode |= MODE_ECHO;
 170
 171         if (localflow)
 172                 mode |= MODE_FLOW;
 173
 174         if (my_want_state_is_will(TELOPT_BINARY))
 175                 mode |= MODE_INBIN;
 176
 177         if (my_want_state_is_do(TELOPT_BINARY))
 178                 mode |= MODE_OUTBIN;
 179
 180 #ifdef  KLUDGELINEMODE
 181         if (kludgelinemode) {
 182                 if (my_want_state_is_dont(TELOPT_SGA)) {
 183                         mode |= (MODE_TRAPSIG|MODE_EDIT);
 184                         if (dontlecho &&
 185                             (clocks.echotoggle > clocks.modenegotiated)) {
 186                                 mode &= ~MODE_ECHO;
 187                         }
 188                 }
 189                 return (mode);
 190         }
 191 #endif
 192         if (my_want_state_is_will(TELOPT_LINEMODE))
 193                 mode |= linemode;
 194         return (mode);
 195 }
 196
 197 void
 198 setconnmode(force)
 199         int force;
 200 {
 201         static int enc_passwd = 0;
 202         register int newmode;
 203
 204         newmode = getconnmode()|(force?MODE_FORCE:0);
 205
 206         TerminalNewMode(newmode);
 207
 208         if ((newmode & (MODE_ECHO|MODE_EDIT)) == MODE_EDIT) {
 209                 if (my_want_state_is_will(TELOPT_ENCRYPT) &&
 210                     (enc_passwd == 0) && !encrypt_output) {
 211                         encrypt_request_start(0, 0);
 212                         enc_passwd = 1;
 213                 }
 214         } else {
 215                 if (enc_passwd) {
 216                         encrypt_request_end();
 217                         enc_passwd = 0;
 218                 }
 219         }
 220 }
 221
 222
 223     void
 224 setcommandmode()
 225 {
 226         TerminalNewMode(-1);
 227 }