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
40 static char sccsid[] = "@(#)tipout.c 8.1 (Berkeley) 6/6/93";
41 static 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
54 static jmp_buf sigbuf;
55
56 static void intIOT(int);
57 static void intEMT(int);
58 static void intTERM(int);
59 static 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*/
66 static void
intIOT(int signo)67 intIOT(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*/
79 static void
intEMT(int signo)80 intEMT(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
109 static void
intTERM(int signo)110 intTERM(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*/
120 static void
intSYS(int signo)121 intSYS(int signo)
122 {
123 setboolean(value(BEAUTIFY), !boolean(value(BEAUTIFY)));
124 longjmp(sigbuf, 1);
125 }
126
127 /*
128 * ****TIPOUT TIPOUT****
129 */
130 void
tipout(void)131 tipout(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