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 #ifndef lint
  46 static char sccsid[] = "@(#)terminal.c  8.1 (Berkeley) 6/6/93";
  47 #endif /* not lint */
  48
  49 #include <arpa/telnet.h>
  50 #include <sys/types.h>
  51 #include <errno.h>
  52
  53 #include "ring.h"
  54
  55 #include "externs.h"
  56 #include "types.h"
  57
  58 Ring    ttyoring;
  59 Ring    ttyiring;
  60 static unsigned char ttyobuf[2*BUFSIZ];
  61 static unsigned char ttyibuf[BUFSIZ];
  62
  63 int termdata;                   /* Debugging flag */
  64
  65 #ifdef  USE_TERMIO
  66 cc_t termAytChar;
  67 #else
  68 cc_t termForw2Char;
  69 cc_t termAytChar;
  70 #endif
  71
  72 /*
  73  * initialize the terminal data structures.
  74  */
  75
  76     void
  77 init_terminal()
  78 {
  79         if (ring_init(&ttyoring, ttyobuf, sizeof (ttyobuf)) != 1) {
  80                 exit(1);
  81         }
  82         if (ring_init(&ttyiring, ttyibuf, sizeof (ttyibuf)) != 1) {
  83                 exit(1);
  84         }
  85         autoflush = 1;
  86 }
  87
  88
  89 /*
  90  *              Send as much data as possible to the terminal.
  91  *
  92  *              Return value:
  93  *                      -2: Error occurred other than EWOULDBLOCK; see
  94  *                          'errno' for specifics
  95  *                      -1: No useful work done, although data was waiting.
  96  *                          This may be due to EWOULDBLOCK error.
  97  *                       0: No data was waiting, so nothing was done.
  98  *                       1: All waiting data was written out.
  99  *                       n: Part of data was written.  'n' is the number
 100  *                          of bytes remaining which were not written.
 101  */
 102
 103 int
 104 ttyflush(drop)
 105         int drop;
 106 {
 107         register int n, n0, n1;
 108
 109         n0 = ring_full_count(&ttyoring);
 110         if ((n1 = n = ring_full_consecutive(&ttyoring)) > 0) {
 111                 if (drop) {
 112                         TerminalFlushOutput();
 113                         /* we leave 'n' alone! */
 114                 } else {
 115                         n = TerminalWrite((char *)ttyoring.consume, n);
 116                         if (n == -1 && errno != EWOULDBLOCK)
 117                                 return (-2);
 118                 }
 119         }
 120         if (n > 0) {
 121                 if (termdata && n) {
 122                         Dump('>', ttyoring.consume, n);
 123                 }
 124                 /*
 125                  * If we wrote everything, and the full count is
 126                  * larger than what we wrote, then write the
 127                  * rest of the buffer.
 128                  */
 129                 if (n1 == n && n0 > n) {
 130                         n1 = n0 - n;
 131                         if (!drop) {
 132                                 n1 = TerminalWrite((char *)ttyoring.bottom, n1);
 133                                 if (n1 == -1) {
 134                                         if (errno != EWOULDBLOCK)
 135                                                 return (-2);
 136                                         n1 = 0;
 137                                 }
 138                         }
 139                         n += n1;
 140                 }
 141                 ring_consumed(&ttyoring, n);
 142         }
 143         if (n < 0)
 144                 return (-1);
 145
 146         if (n == n0) {
 147                 if (n0)
 148                         return (-1);
 149                 return (0);
 150         }
 151         return (n0 - n + 1);
 152 }
 153
 154
 155 /*
 156  * These routines decides on what the mode should be (based on the values
 157  * of various global variables).
 158  */
 159
 160
 161 int
 162 getconnmode()
 163 {
 164         extern int linemode;
 165         int mode = 0;
 166 #ifdef  KLUDGELINEMODE
 167         extern int kludgelinemode;
 168 #endif
 169
 170         if (my_want_state_is_dont(TELOPT_ECHO))
 171                 mode |= MODE_ECHO;
 172
 173         if (localflow)
 174                 mode |= MODE_FLOW;
 175
 176         if (my_want_state_is_will(TELOPT_BINARY))
 177                 mode |= MODE_INBIN;
 178
 179         if (my_want_state_is_do(TELOPT_BINARY))
 180                 mode |= MODE_OUTBIN;
 181
 182 #ifdef  KLUDGELINEMODE
 183         if (kludgelinemode) {
 184                 if (my_want_state_is_dont(TELOPT_SGA)) {
 185                         mode |= (MODE_TRAPSIG|MODE_EDIT);
 186                         if (dontlecho &&
 187                             (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(force)
 201         int force;
 202 {
 203         static int enc_passwd = 0;
 204         register int newmode;
 205
 206         newmode = getconnmode()|(force?MODE_FORCE:0);
 207
 208         TerminalNewMode(newmode);
 209
 210         if ((newmode & (MODE_ECHO|MODE_EDIT)) == MODE_EDIT) {
 211                 if (my_want_state_is_will(TELOPT_ENCRYPT) &&
 212                     (enc_passwd == 0) && !encrypt_output) {
 213                         encrypt_request_start(0, 0);
 214                         enc_passwd = 1;
 215                 }
 216         } else {
 217                 if (enc_passwd) {
 218                         encrypt_request_end();
 219                         enc_passwd = 0;
 220                 }
 221         }
 222 }
 223
 224
 225     void
 226 setcommandmode()
 227 {
 228         TerminalNewMode(-1);
 229 }