usr.bin/tip/tipout.c

   1 /*      $NetBSD: tipout.c,v 1.13 2006/04/03 16:13:34 tls Exp $  */
   2
   3 /*
   4  * Copyright (c) 1983, 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 #include <poll.h>
  34 #ifndef lint
  35 #if 0
  36 static char sccsid[] = "@(#)tipout.c    8.1 (Berkeley) 6/6/93";
  37 #endif
  38 __RCSID("$NetBSD: tipout.c,v 1.13 2006/04/03 16:13:34 tls Exp $");
  39 #endif /* not lint */
  40
  41 #include "tip.h"
  42 /*
  43  * tip
  44  *
  45  * lower fork of tip -- handles passive side
  46  *  reading from the remote host
  47  */
  48
  49 void    intEMT(void);
  50 void    intIOT(void);
  51 void    intSYS(void);
  52 void    intTERM(int);
  53
  54 /*
  55  * TIPOUT wait state routine --
  56  *   sent by TIPIN when it wants to posses the remote host
  57  */
  58 void
  59 intIOT(void)
  60 {
  61
  62         (void)write(repdes[1],&ccc,1);  /* We got the message */
  63         (void)read(fildes[0], &ccc,1);  /* Now wait for coprocess */
  64 }
  65
  66 /*
  67  * Scripting command interpreter --
  68  *  accepts script file name over the pipe and acts accordingly
  69  */
  70 void
  71 intEMT(void)
  72 {
  73         char c, line[256];
  74         char *pline = line;
  75         char reply;
  76
  77         (void)read(fildes[0], &c, 1);           /* We got the message */
  78         while (c != '\n' && line + sizeof line - pline > 0) {
  79                 *pline++ = c;
  80                 (void)read(fildes[0], &c, 1);
  81         }
  82         *pline = '\0';
  83         if (boolean(value(SCRIPT)) && fscript != NULL)
  84                 (void)fclose(fscript);
  85         if (pline == line) {
  86                 setboolean(value(SCRIPT), FALSE);
  87                 reply = 'y';
  88         } else {
  89                 if ((fscript = fopen(line, "a")) == NULL)
  90                         reply = 'n';
  91                 else {
  92                         reply = 'y';
  93                         setboolean(value(SCRIPT), TRUE);
  94                 }
  95         }
  96         (void)write(repdes[1], &reply, 1);      /* Now coprocess waits for us */
  97 }
  98
  99 void
 100 /*ARGSUSED*/
 101 intTERM(int dummy __unused)
 102 {
 103
 104         if (boolean(value(SCRIPT)) && fscript != NULL)
 105                 (void)fclose(fscript);
 106         exit(0);
 107 }
 108
 109 void
 110 intSYS(void)
 111 {
 112
 113         setboolean(value(BEAUTIFY), !boolean(value(BEAUTIFY)));
 114 }
 115
 116 /*
 117  * ****TIPOUT   TIPOUT****
 118  */
 119 void
 120 tipout(void)
 121 {
 122         char buf[BUFSIZ];
 123         char *cp;
 124         int cnt;
 125         int omask;
 126         struct pollfd pfd[2];
 127
 128         (void)signal(SIGINT, SIG_IGN);
 129         (void)signal(SIGQUIT, SIG_IGN);
 130         (void)signal(SIGHUP, intTERM);  /* for dial-ups */
 131         (void)signal(SIGTERM, intTERM); /* time to go signal*/
 132
 133         pfd[0].fd = attndes[0];
 134         pfd[0].events = POLLIN;
 135         pfd[1].fd = FD;
 136         pfd[1].events = POLLIN|POLLHUP;
 137
 138         for (omask = 0;; (void)sigsetmask(omask)) {
 139
 140         if (poll(pfd, 2, -1) > 0) {
 141
 142         if (pfd[0].revents & POLLIN)
 143                 if (read(attndes[0], &ccc, 1) > 0) {
 144                         switch(ccc) {
 145                         case 'W':
 146                                 intIOT();       /* TIPIN wants us to wait */
 147                                 break;
 148                         case 'S':
 149                                 intEMT();       /* TIPIN wants us to script */
 150                                 break;
 151                         case 'B':
 152                                 intSYS();       /* "Beautify" value toggle */
 153                                 break;
 154                         default:
 155                                 break;
 156                         }
 157                 }
 158         }
 159
 160         if (pfd[1].revents & (POLLIN|POLLHUP)) {
 161                         cnt = read(FD, buf, BUFSIZ);
 162                         if (cnt <= 0) {
 163                                 /* lost carrier || EOF */
 164                                 if ((cnt < 0 && errno == EIO) || (cnt == 0)) {
 165                                         (void)sigblock(sigmask(SIGTERM));
 166                                         intTERM(0);
 167                                         /*NOTREACHED*/
 168                                 }
 169                                 continue;
 170                         }
 171                         omask = sigblock(SIGTERM);
 172                         for (cp = buf; cp < buf + cnt; cp++)
 173                                 *cp &= STRIP_PAR;
 174                         (void)write(1, buf, (size_t)cnt);
 175                         if (boolean(value(SCRIPT)) && fscript != NULL) {
 176                                 if (!boolean(value(BEAUTIFY))) {
 177                                         (void)fwrite(buf, 1, (size_t)cnt, fscript);
 178                                         continue;
 179                                 }
 180                                 for (cp = buf; cp < buf + cnt; cp++)
 181                                         if ((*cp >= ' ' && *cp <= '~') ||
 182                                             any(*cp, value(EXCEPTIONS)))
 183                                                 (void)putc(*cp, fscript);
 184                         }
 185                 }
 186         }
 187 }