usr.bin/telnet/terminal.c

   1 /*      $NetBSD: terminal.c,v 1.14 2004/03/20 23:26:05 heas Exp $       */
   2
   3 /*
   4  * Copyright (c) 1988, 1990, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "@(#)terminal.c  8.2 (Berkeley) 2/16/95";
  36 #else
  37 __RCSID("$NetBSD: terminal.c,v 1.14 2004/03/20 23:26:05 heas Exp $");
  38 #endif
  39 #endif /* not lint */
  40
  41 #include <arpa/telnet.h>
  42 #include <sys/types.h>
  43
  44 #include "ring.h"
  45
  46 #include "externs.h"
  47 #include "types.h"
  48
  49 #ifdef ENCRYPTION
  50 #include <libtelnet/encrypt.h>
  51 #endif
  52
  53 Ring            ttyoring, ttyiring;
  54 unsigned char   ttyobuf[2*BUFSIZ], ttyibuf[BUFSIZ];
  55 char line[] = { '\0' };
  56
  57 int termdata;                   /* Debugging flag */
  58
  59 /*
  60  * initialize the terminal data structures.
  61  */
  62
  63 void
  64 init_terminal(void)
  65 {
  66     if (ring_init(&ttyoring, ttyobuf, sizeof ttyobuf) != 1) {
  67         exit(1);
  68     }
  69     if (ring_init(&ttyiring, ttyibuf, sizeof ttyibuf) != 1) {
  70         exit(1);
  71     }
  72     autoflush = TerminalAutoFlush();
  73 }
  74
  75
  76 /*
  77  *              Send as much data as possible to the terminal, else exits if
  78  *              it encounters a permanent failure when writing to the tty.
  79  *
  80  *              Return value:
  81  *                      -1: No useful work done, data waiting to go out.
  82  *                       0: No data was waiting, so nothing was done.
  83  *                       1: All waiting data was written out.
  84  *                       n: All data - n was written out.
  85  */
  86
  87
  88 int
  89 ttyflush(int drop)
  90 {
  91     int n, n0, n1;
  92
  93     n0 = ring_full_count(&ttyoring);
  94     if ((n1 = n = ring_full_consecutive(&ttyoring)) > 0) {
  95         if (drop) {
  96             TerminalFlushOutput();
  97             /* we leave 'n' alone! */
  98         } else {
  99             n = TerminalWrite(ttyoring.consume, n);
 100         }
 101     }
 102     if (n > 0) {
 103         if (termdata && n) {
 104             Dump('>', ttyoring.consume, n);
 105         }
 106         /*
 107          * If we wrote everything, and the full count is
 108          * larger than what we wrote, then write the
 109          * rest of the buffer.
 110          */
 111         if (n1 == n && n0 > n) {
 112                 n1 = n0 - n;
 113                 if (!drop)
 114                         n1 = TerminalWrite(ttyoring.bottom, n1);
 115                 if (n1 > 0)
 116                         n += n1;
 117         }
 118         ring_consumed(&ttyoring, n);
 119     }
 120     if (n < 0) {
 121         if (errno == EAGAIN || errno == EINTR) {
 122             return -1;
 123         } else {
 124             ring_consumed(&ttyoring, ring_full_count(&ttyoring));
 125             setconnmode(0);
 126             setcommandmode();
 127             NetClose(net);
 128             fprintf(stderr, "Connection closed by foreign host.\n");
 129             exit(1);
 130         }
 131     }
 132     if (n == n0) {
 133         if (n0)
 134             return -1;
 135         return 0;
 136     }
 137     return n0 - n + 1;
 138 }
 139
 140 \f
 141 /*
 142  * These routines decides on what the mode should be (based on the values
 143  * of various global variables).
 144  */
 145
 146
 147 int
 148 getconnmode(void)
 149 {
 150     extern int linemode;
 151     int mode = 0;
 152 #ifdef  KLUDGELINEMODE
 153     extern int kludgelinemode;
 154 #endif
 155
 156     if (In3270)
 157         return(MODE_FLOW);
 158
 159     if (my_want_state_is_dont(TELOPT_ECHO))
 160         mode |= MODE_ECHO;
 161
 162     if (localflow)
 163         mode |= MODE_FLOW;
 164
 165     if (my_want_state_is_will(TELOPT_BINARY))
 166         mode |= MODE_INBIN;
 167
 168     if (his_want_state_is_will(TELOPT_BINARY))
 169         mode |= MODE_OUTBIN;
 170
 171 #ifdef  KLUDGELINEMODE
 172     if (kludgelinemode) {
 173         if (my_want_state_is_dont(TELOPT_SGA)) {
 174             mode |= (MODE_TRAPSIG|MODE_EDIT);
 175             if (dontlecho && (clocks.echotoggle > clocks.modenegotiated)) {
 176                 mode &= ~MODE_ECHO;
 177             }
 178         }
 179         return(mode);
 180     }
 181 #endif
 182     if (my_want_state_is_will(TELOPT_LINEMODE))
 183         mode |= linemode;
 184     return(mode);
 185 }
 186
 187 void
 188 setconnmode(int force)
 189 {
 190 #ifdef  ENCRYPTION
 191     static int enc_passwd = 0;
 192 #endif
 193     int newmode;
 194
 195     newmode = getconnmode()|(force?MODE_FORCE:0);
 196
 197     TerminalNewMode(newmode);
 198
 199 #ifdef  ENCRYPTION
 200     if ((newmode & (MODE_ECHO|MODE_EDIT)) == MODE_EDIT) {
 201         if (my_want_state_is_will(TELOPT_ENCRYPT)
 202                                 && (enc_passwd == 0) && !encrypt_output) {
 203             encrypt_request_start(0, 0);
 204             enc_passwd = 1;
 205         }
 206     } else {
 207         if (enc_passwd) {
 208             encrypt_request_end();
 209             enc_passwd = 0;
 210         }
 211     }
 212 #endif  /* ENCRYPTION */
 213 }
 214
 215
 216 void
 217 setcommandmode(void)
 218 {
 219     TerminalNewMode(-1);
 220 }