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tipout.c revision 1.2 
      1 /*
      2  * Copyright (c) 1983 The Regents of the University of California.
      3  * 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. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #ifndef lint
     35 /*static char sccsid[] = "from: @(#)tipout.c	5.4 (Berkeley) 3/2/91";*/
     36 static char rcsid[] = "$Id: tipout.c,v 1.2 1993/08/01 18:06:34 mycroft Exp $";
     37 #endif /* not lint */
     38 
     39 #include "tip.h"
     40 /*
     41  * tip
     42  *
     43  * lower fork of tip -- handles passive side
     44  *  reading from the remote host
     45  */
     46 
     47 static	jmp_buf sigbuf;
     48 
     49 /*
     50  * TIPOUT wait state routine --
     51  *   sent by TIPIN when it wants to posses the remote host
     52  */
     53 void
     54 intIOT()
     55 {
     56 
     57 	write(repdes[1],&ccc,1);
     58 	read(fildes[0], &ccc,1);
     59 	longjmp(sigbuf, 1);
     60 }
     61 
     62 /*
     63  * Scripting command interpreter --
     64  *  accepts script file name over the pipe and acts accordingly
     65  */
     66 void
     67 intEMT()
     68 {
     69 	char c, line[256];
     70 	register char *pline = line;
     71 	char reply;
     72 
     73 	read(fildes[0], &c, 1);
     74 	while (c != '\n') {
     75 		*pline++ = c;
     76 		read(fildes[0], &c, 1);
     77 	}
     78 	*pline = '\0';
     79 	if (boolean(value(SCRIPT)) && fscript != NULL)
     80 		fclose(fscript);
     81 	if (pline == line) {
     82 		boolean(value(SCRIPT)) = FALSE;
     83 		reply = 'y';
     84 	} else {
     85 		if ((fscript = fopen(line, "a")) == NULL)
     86 			reply = 'n';
     87 		else {
     88 			reply = 'y';
     89 			boolean(value(SCRIPT)) = TRUE;
     90 		}
     91 	}
     92 	write(repdes[1], &reply, 1);
     93 	longjmp(sigbuf, 1);
     94 }
     95 
     96 void
     97 intTERM()
     98 {
     99 
    100 	if (boolean(value(SCRIPT)) && fscript != NULL)
    101 		fclose(fscript);
    102 	exit(0);
    103 }
    104 
    105 void
    106 intSYS()
    107 {
    108 
    109 	boolean(value(BEAUTIFY)) = !boolean(value(BEAUTIFY));
    110 	longjmp(sigbuf, 1);
    111 }
    112 
    113 /*
    114  * ****TIPOUT   TIPOUT****
    115  */
    116 tipout()
    117 {
    118 	char buf[BUFSIZ];
    119 	register char *cp;
    120 	register int cnt;
    121 	extern int errno;
    122 	int omask;
    123 
    124 	signal(SIGINT, SIG_IGN);
    125 	signal(SIGQUIT, SIG_IGN);
    126 	signal(SIGEMT, intEMT);		/* attention from TIPIN */
    127 	signal(SIGTERM, intTERM);	/* time to go signal */
    128 	signal(SIGIOT, intIOT);		/* scripting going on signal */
    129 	signal(SIGHUP, intTERM);	/* for dial-ups */
    130 	signal(SIGSYS, intSYS);		/* beautify toggle */
    131 	(void) setjmp(sigbuf);
    132 	for (omask = 0;; sigsetmask(omask)) {
    133 		cnt = read(FD, buf, BUFSIZ);
    134 		if (cnt <= 0) {
    135 			/* lost carrier */
    136 			if (cnt < 0 && errno == EIO) {
    137 				sigblock(sigmask(SIGTERM));
    138 				intTERM();
    139 				/*NOTREACHED*/
    140 			}
    141 			continue;
    142 		}
    143 #define	ALLSIGS	sigmask(SIGEMT)|sigmask(SIGTERM)|sigmask(SIGIOT)|sigmask(SIGSYS)
    144 		omask = sigblock(ALLSIGS);
    145 		for (cp = buf; cp < buf + cnt; cp++)
    146 			*cp &= 0177;
    147 		write(1, buf, cnt);
    148 		if (boolean(value(SCRIPT)) && fscript != NULL) {
    149 			if (!boolean(value(BEAUTIFY))) {
    150 				fwrite(buf, 1, cnt, fscript);
    151 				continue;
    152 			}
    153 			for (cp = buf; cp < buf + cnt; cp++)
    154 				if ((*cp >= ' ' && *cp <= '~') ||
    155 				    any(*cp, value(EXCEPTIONS)))
    156 					putc(*cp, fscript);
    157 		}
    158 	}
    159 }
    160