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 * SPDX-License-Identifier: BSD-3-Clause
6 *
7 * Copyright (c) 1983, 1993
8 *	The Regents of the University of California.  All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <sys/cdefs.h>
36__FBSDID("$FreeBSD$");
37
38#ifndef lint
39#if 0
40static char sccsid[] = "@(#)tipout.c	8.1 (Berkeley) 6/6/93";
41static const char rcsid[] = "$OpenBSD: tipout.c,v 1.18 2006/05/31 07:03:08 jason Exp $";
42#endif
43#endif /* not lint */
44
45#include "tip.h"
46
47/*
48 * tip
49 *
50 * lower fork of tip -- handles passive side
51 *  reading from the remote host
52 */
53
54static	jmp_buf sigbuf;
55
56static void	intIOT(int);
57static void	intEMT(int);
58static void	intTERM(int);
59static void	intSYS(int);
60
61/*
62 * TIPOUT wait state routine --
63 *   sent by TIPIN when it wants to posses the remote host
64 */
65/*ARGSUSED*/
66static void
67intIOT(int signo)
68{
69	write(repdes[1],&ccc,1);
70	read(fildes[0], &ccc,1);
71	longjmp(sigbuf, 1);
72}
73
74/*
75 * Scripting command interpreter --
76 *  accepts script file name over the pipe and acts accordingly
77 */
78/*ARGSUSED*/
79static void
80intEMT(int signo)
81{
82	char c, line[256];
83	char *pline = line;
84	char reply;
85
86	read(fildes[0], &c, 1);
87	while (c != '\n' && (size_t)(pline - line) < sizeof(line)) {
88		*pline++ = c;
89		read(fildes[0], &c, 1);
90	}
91	*pline = '\0';
92	if (boolean(value(SCRIPT)) && fscript != NULL)
93		fclose(fscript);
94	if (pline == line) {
95		setboolean(value(SCRIPT), FALSE);
96		reply = 'y';
97	} else {
98		if ((fscript = fopen(line, "a")) == NULL)
99			reply = 'n';
100		else {
101			reply = 'y';
102			setboolean(value(SCRIPT), TRUE);
103		}
104	}
105	write(repdes[1], &reply, 1);
106	longjmp(sigbuf, 1);
107}
108
109static void
110intTERM(int signo)
111{
112	if (boolean(value(SCRIPT)) && fscript != NULL)
113		fclose(fscript);
114	if (signo && tipin_pid)
115		kill(tipin_pid, signo);
116	exit(0);
117}
118
119/*ARGSUSED*/
120static void
121intSYS(int signo)
122{
123	setboolean(value(BEAUTIFY), !boolean(value(BEAUTIFY)));
124	longjmp(sigbuf, 1);
125}
126
127/*
128 * ****TIPOUT   TIPOUT****
129 */
130void
131tipout(void)
132{
133	char buf[BUFSIZ];
134	char *cp;
135	ssize_t scnt;
136	size_t cnt;
137	sigset_t mask, omask;
138
139	signal(SIGINT, SIG_IGN);
140	signal(SIGQUIT, SIG_IGN);
141	signal(SIGEMT, intEMT);		/* attention from TIPIN */
142	signal(SIGTERM, intTERM);	/* time to go signal */
143	signal(SIGIOT, intIOT);		/* scripting going on signal */
144	signal(SIGHUP, intTERM);	/* for dial-ups */
145	signal(SIGSYS, intSYS);		/* beautify toggle */
146	(void) setjmp(sigbuf);
147	sigprocmask(SIG_BLOCK, NULL, &omask);
148	for (;;) {
149		sigprocmask(SIG_SETMASK, &omask, NULL);
150		scnt = read(FD, buf, BUFSIZ);
151		if (scnt <= 0) {
152			/* lost carrier */
153			if (scnt == 0 ||
154			    (scnt < 0 && (errno == EIO || errno == ENXIO))) {
155				sigemptyset(&mask);
156				sigaddset(&mask, SIGTERM);
157				sigprocmask(SIG_BLOCK, &mask, NULL);
158				intTERM(SIGHUP);
159				/*NOTREACHED*/
160			}
161			continue;
162		}
163		cnt = scnt;
164		sigemptyset(&mask);
165		sigaddset(&mask, SIGEMT);
166		sigaddset(&mask, SIGTERM);
167		sigaddset(&mask, SIGIOT);
168		sigaddset(&mask, SIGSYS);
169		sigprocmask(SIG_BLOCK, &mask, NULL);
170		for (cp = buf; cp < buf + cnt; cp++)
171			*cp &= STRIP_PAR;
172		write(STDOUT_FILENO, buf, cnt);
173		if (boolean(value(SCRIPT)) && fscript != NULL) {
174			if (!boolean(value(BEAUTIFY))) {
175				fwrite(buf, 1, cnt, fscript);
176			} else {
177				for (cp = buf; cp < buf + cnt; cp++)
178					if ((*cp >= ' ' && *cp <= '~') ||
179					    any(*cp, value(EXCEPTIONS)))
180						putc(*cp, fscript);
181			}
182			for (cp = buf; cp < buf + cnt; cp++) {
183				if (!isgraph(*cp)) {
184					fflush(fscript);
185					break;
186				}
187			}
188		}
189	}
190}
191