usr.bin/tip/tipout.c

   1 /*
   2  * Copyright (c) 1983, 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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)tipout.c 8.1 (Berkeley) 6/6/93
  30  * $FreeBSD: src/usr.bin/tip/tip/tipout.c,v 1.6.2.2 2001/06/02 08:08:24 phk Exp $
  31  */
  32
  33 #include "tip.h"
  34 #include <errno.h>
  35 /*
  36  * tip
  37  *
  38  * lower fork of tip -- handles passive side
  39  *  reading from the remote host
  40  */
  41
  42 static  jmp_buf sigbuf;
  43
  44 /*
  45  * TIPOUT wait state routine --
  46  *   sent by TIPIN when it wants to posses the remote host
  47  */
  48 static void
  49 intIOT(int signo)
  50 {
  51
  52         write(repdes[1],&ccc,1);
  53         read(fildes[0], &ccc,1);
  54         longjmp(sigbuf, 1);
  55 }
  56
  57 /*
  58  * Scripting command interpreter --
  59  *  accepts script file name over the pipe and acts accordingly
  60  */
  61 static void
  62 intEMT(int signo)
  63 {
  64         char c, line[256];
  65         char *pline = line;
  66         char reply;
  67
  68         read(fildes[0], &c, 1);
  69         while (c != '\n' && (size_t)(pline - line) < sizeof(line)) {
  70                 *pline++ = c;
  71                 read(fildes[0], &c, 1);
  72         }
  73         *pline = '\0';
  74         if (boolean(value(SCRIPT)) && fscript != NULL)
  75                 fclose(fscript);
  76         if (pline == line) {
  77                 boolean(value(SCRIPT)) = FALSE;
  78                 reply = 'y';
  79         } else {
  80                 if ((fscript = fopen(line, "a")) == NULL)
  81                         reply = 'n';
  82                 else {
  83                         reply = 'y';
  84                         boolean(value(SCRIPT)) = TRUE;
  85                 }
  86         }
  87         write(repdes[1], &reply, 1);
  88         longjmp(sigbuf, 1);
  89 }
  90
  91 static void
  92 intTERM(int signo)
  93 {
  94
  95         if (boolean(value(SCRIPT)) && fscript != NULL)
  96                 fclose(fscript);
  97         exit(0);
  98 }
  99
 100 static void
 101 intSYS(int signo)
 102 {
 103
 104         boolean(value(BEAUTIFY)) = !boolean(value(BEAUTIFY));
 105         longjmp(sigbuf, 1);
 106 }
 107
 108 /*
 109  * ****TIPOUT   TIPOUT****
 110  */
 111 void
 112 tipout(void)
 113 {
 114         char buf[BUFSIZ];
 115         char *cp;
 116         int cnt;
 117         int omask;
 118
 119         signal(SIGINT, SIG_IGN);
 120         signal(SIGQUIT, SIG_IGN);
 121         signal(SIGEMT, intEMT);         /* attention from TIPIN */
 122         signal(SIGTERM, intTERM);       /* time to go signal */
 123         signal(SIGIOT, intIOT);         /* scripting going on signal */
 124         signal(SIGHUP, intTERM);        /* for dial-ups */
 125         signal(SIGSYS, intSYS);         /* beautify toggle */
 126         (void) setjmp(sigbuf);
 127         for (omask = 0;; sigsetmask(omask)) {
 128                 cnt = read(FD, buf, BUFSIZ);
 129                 if (cnt <= 0) {
 130                         /* lost carrier */
 131                         if (cnt < 0 && errno == EIO) {
 132                                 sigblock(sigmask(SIGTERM));
 133                                 intTERM(0);
 134                                 /*NOTREACHED*/
 135                         } else if (cnt == 0 && errno == ENOENT) {
 136                                 if (getppid() != 1)
 137                                         kill(getppid(),SIGUSR1);
 138                                 sigblock(sigmask(SIGTERM));
 139                                 intTERM(0);
 140                                 /*NOTREACHED*/
 141                         } else if (cnt < 0) {
 142                                 if (getppid() != 1)
 143                                         kill(getppid(),SIGUSR1);
 144                                 sigblock(sigmask(SIGTERM));
 145                                 intTERM(0);
 146                                 /*NOTREACHED*/
 147                         }
 148                         continue;
 149                 }
 150 #define ALLSIGS sigmask(SIGEMT)|sigmask(SIGTERM)|sigmask(SIGIOT)|sigmask(SIGSYS)
 151                 omask = sigblock(ALLSIGS);
 152                 for (cp = buf; cp < buf + cnt; cp++)
 153                         *cp &= 0177;
 154                 if (write(1, buf, cnt) < 0)
 155                         exit(1);
 156                 if (boolean(value(SCRIPT)) && fscript != NULL) {
 157                         if (!boolean(value(BEAUTIFY))) {
 158                                 fwrite(buf, 1, cnt, fscript);
 159                                 continue;
 160                         }
 161                         for (cp = buf; cp < buf + cnt; cp++)
 162                                 if ((*cp >= ' ' && *cp <= '~') ||
 163                                     any(*cp, value(EXCEPTIONS)))
 164                                         putc(*cp, fscript);
 165                 }
 166         }
 167 }