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tipout.c revision 1.1 
      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[] = "@(#)tipout.c	5.4 (Berkeley) 3/2/91";
     36 #endif /* not lint */
     37 
     38 #include "tip.h"
     39 /*
     40  * tip
     41  *
     42  * lower fork of tip -- handles passive side
     43  *  reading from the remote host
     44  */
     45 
     46 static	jmp_buf sigbuf;
     47 
     48 /*
     49  * TIPOUT wait state routine --
     50  *   sent by TIPIN when it wants to posses the remote host
     51  */
     52 void
     53 intIOT()
     54 {
     55 
     56 	write(repdes[1],&ccc,1);
     57 	read(fildes[0], &ccc,1);
     58 	longjmp(sigbuf, 1);
     59 }
     60 
     61 /*
     62  * Scripting command interpreter --
     63  *  accepts script file name over the pipe and acts accordingly
     64  */
     65 void
     66 intEMT()
     67 {
     68 	char c, line[256];
     69 	register char *pline = line;
     70 	char reply;
     71 
     72 	read(fildes[0], &c, 1);
     73 	while (c != '\n') {
     74 		*pline++ = c;
     75 		read(fildes[0], &c, 1);
     76 	}
     77 	*pline = '\0';
     78 	if (boolean(value(SCRIPT)) && fscript != NULL)
     79 		fclose(fscript);
     80 	if (pline == line) {
     81 		boolean(value(SCRIPT)) = FALSE;
     82 		reply = 'y';
     83 	} else {
     84 		if ((fscript = fopen(line, "a")) == NULL)
     85 			reply = 'n';
     86 		else {
     87 			reply = 'y';
     88 			boolean(value(SCRIPT)) = TRUE;
     89 		}
     90 	}
     91 	write(repdes[1], &reply, 1);
     92 	longjmp(sigbuf, 1);
     93 }
     94 
     95 void
     96 intTERM()
     97 {
     98 
     99 	if (boolean(value(SCRIPT)) && fscript != NULL)
    100 		fclose(fscript);
    101 	exit(0);
    102 }
    103 
    104 void
    105 intSYS()
    106 {
    107 
    108 	boolean(value(BEAUTIFY)) = !boolean(value(BEAUTIFY));
    109 	longjmp(sigbuf, 1);
    110 }
    111 
    112 /*
    113  * ****TIPOUT   TIPOUT****
    114  */
    115 tipout()
    116 {
    117 	char buf[BUFSIZ];
    118 	register char *cp;
    119 	register int cnt;
    120 	extern int errno;
    121 	int omask;
    122 
    123 	signal(SIGINT, SIG_IGN);
    124 	signal(SIGQUIT, SIG_IGN);
    125 	signal(SIGEMT, intEMT);		/* attention from TIPIN */
    126 	signal(SIGTERM, intTERM);	/* time to go signal */
    127 	signal(SIGIOT, intIOT);		/* scripting going on signal */
    128 	signal(SIGHUP, intTERM);	/* for dial-ups */
    129 	signal(SIGSYS, intSYS);		/* beautify toggle */
    130 	(void) setjmp(sigbuf);
    131 	for (omask = 0;; sigsetmask(omask)) {
    132 		cnt = read(FD, buf, BUFSIZ);
    133 		if (cnt <= 0) {
    134 			/* lost carrier */
    135 			if (cnt < 0 && errno == EIO) {
    136 				sigblock(sigmask(SIGTERM));
    137 				intTERM();
    138 				/*NOTREACHED*/
    139 			}
    140 			continue;
    141 		}
    142 #define	ALLSIGS	sigmask(SIGEMT)|sigmask(SIGTERM)|sigmask(SIGIOT)|sigmask(SIGSYS)
    143 		omask = sigblock(ALLSIGS);
    144 		for (cp = buf; cp < buf + cnt; cp++)
    145 			*cp &= 0177;
    146 		write(1, buf, cnt);
    147 		if (boolean(value(SCRIPT)) && fscript != NULL) {
    148 			if (!boolean(value(BEAUTIFY))) {
    149 				fwrite(buf, 1, cnt, fscript);
    150 				continue;
    151 			}
    152 			for (cp = buf; cp < buf + cnt; cp++)
    153 				if ((*cp >= ' ' && *cp <= '~') ||
    154 				    any(*cp, value(EXCEPTIONS)))
    155 					putc(*cp, fscript);
    156 		}
    157 	}
    158 }
    159