tipout.c revision 230654 
1/*	$OpenBSD: tipout.c,v 1.18 2006/05/31 07:03:08 jason Exp $	*/
2/*	$NetBSD: tipout.c,v 1.5 1996/12/29 10:34:12 cgd Exp $	*/
3
4/*
5 * Copyright (c) 1983, 1993
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD: head/usr.bin/tip/tip/tipout.c 230654 2012-01-28 20:45:47Z phk $");
35
36#ifndef lint
37#if 0
38static char sccsid[] = "@(#)tipout.c	8.1 (Berkeley) 6/6/93";
39static const char rcsid[] = "$OpenBSD: tipout.c,v 1.18 2006/05/31 07:03:08 jason Exp $";
40#endif
41#endif /* not lint */
42
43#include "tip.h"
44
45/*
46 * tip
47 *
48 * lower fork of tip -- handles passive side
49 *  reading from the remote host
50 */
51
52static	jmp_buf sigbuf;
53
54static void	intIOT(int);
55static void	intEMT(int);
56static void	intTERM(int);
57static void	intSYS(int);
58
59/*
60 * TIPOUT wait state routine --
61 *   sent by TIPIN when it wants to posses the remote host
62 */
63/*ARGSUSED*/
64static void
65intIOT(int signo)
66{
67	write(repdes[1],&ccc,1);
68	read(fildes[0], &ccc,1);
69	longjmp(sigbuf, 1);
70}
71
72/*
73 * Scripting command interpreter --
74 *  accepts script file name over the pipe and acts accordingly
75 */
76/*ARGSUSED*/
77static void
78intEMT(int signo)
79{
80	char c, line[256];
81	char *pline = line;
82	char reply;
83
84	read(fildes[0], &c, 1);
85	while (c != '\n' && (size_t)(pline - line) < sizeof(line)) {
86		*pline++ = c;
87		read(fildes[0], &c, 1);
88	}
89	*pline = '\0';
90	if (boolean(value(SCRIPT)) && fscript != NULL)
91		fclose(fscript);
92	if (pline == line) {
93		setboolean(value(SCRIPT), FALSE);
94		reply = 'y';
95	} else {
96		if ((fscript = fopen(line, "a")) == NULL)
97			reply = 'n';
98		else {
99			reply = 'y';
100			setboolean(value(SCRIPT), TRUE);
101		}
102	}
103	write(repdes[1], &reply, 1);
104	longjmp(sigbuf, 1);
105}
106
107static void
108intTERM(int signo)
109{
110	if (boolean(value(SCRIPT)) && fscript != NULL)
111		fclose(fscript);
112	if (signo && tipin_pid)
113		kill(tipin_pid, signo);
114	exit(0);
115}
116
117/*ARGSUSED*/
118static void
119intSYS(int signo)
120{
121	setboolean(value(BEAUTIFY), !boolean(value(BEAUTIFY)));
122	longjmp(sigbuf, 1);
123}
124
125/*
126 * ****TIPOUT   TIPOUT****
127 */
128void
129tipout(void)
130{
131	char buf[BUFSIZ];
132	char *cp;
133	ssize_t scnt;
134	size_t cnt;
135	sigset_t mask, omask;
136
137	signal(SIGINT, SIG_IGN);
138	signal(SIGQUIT, SIG_IGN);
139	signal(SIGEMT, intEMT);		/* attention from TIPIN */
140	signal(SIGTERM, intTERM);	/* time to go signal */
141	signal(SIGIOT, intIOT);		/* scripting going on signal */
142	signal(SIGHUP, intTERM);	/* for dial-ups */
143	signal(SIGSYS, intSYS);		/* beautify toggle */
144	(void) setjmp(sigbuf);
145	sigprocmask(SIG_BLOCK, NULL, &omask);
146	for (;;) {
147		sigprocmask(SIG_SETMASK, &omask, NULL);
148		scnt = read(FD, buf, BUFSIZ);
149		if (scnt <= 0) {
150			/* lost carrier */
151			if (scnt == 0 ||
152			    (scnt < 0 && (errno == EIO || errno == ENXIO))) {
153				sigemptyset(&mask);
154				sigaddset(&mask, SIGTERM);
155				sigprocmask(SIG_BLOCK, &mask, NULL);
156				intTERM(SIGHUP);
157				/*NOTREACHED*/
158			}
159			continue;
160		}
161		cnt = scnt;
162		sigemptyset(&mask);
163		sigaddset(&mask, SIGEMT);
164		sigaddset(&mask, SIGTERM);
165		sigaddset(&mask, SIGIOT);
166		sigaddset(&mask, SIGSYS);
167		sigprocmask(SIG_BLOCK, &mask, NULL);
168		for (cp = buf; cp < buf + cnt; cp++)
169			*cp &= STRIP_PAR;
170		write(STDOUT_FILENO, buf, cnt);
171		if (boolean(value(SCRIPT)) && fscript != NULL) {
172			if (!boolean(value(BEAUTIFY))) {
173				fwrite(buf, 1, cnt, fscript);
174			} else {
175				for (cp = buf; cp < buf + cnt; cp++)
176					if ((*cp >= ' ' && *cp <= '~') ||
177					    any(*cp, value(EXCEPTIONS)))
178						putc(*cp, fscript);
179			}
180			for (cp = buf; cp < buf + cnt; cp++) {
181				if (!isgraph(*cp)) {
182					fflush(fscript);
183					break;
184				}
185			}
186		}
187	}
188}
189