1 /* $OpenBSD: tipout.c,v 1.12 2005/04/11 19:59:07 deraadt 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 #ifndef lint
34 #if 0
35 static char sccsid[] = "@(#)tipout.c 8.1 (Berkeley) 6/6/93";
36 #endif
37 static const char rcsid[] = "$OpenBSD: tipout.c,v 1.12 2005/04/11 19:59:07 deraadt Exp $";
38 #endif /* not lint */
39
40 #include "tip.h"
41 /*
42 * tip
43 *
44 * lower fork of tip -- handles passive side
45 * reading from the remote host
46 */
47
48 static jmp_buf sigbuf;
49
50 /*
51 * TIPOUT wait state routine --
52 * sent by TIPIN when it wants to posses the remote host
53 */
54 void
intIOT()55 intIOT()
56 {
57
58 write(repdes[1],&ccc,1);
59 read(fildes[0], &ccc,1);
60 longjmp(sigbuf, 1);
61 }
62
63 /*
64 * Scripting command interpreter --
65 * accepts script file name over the pipe and acts accordingly
66 */
67 void
intEMT()68 intEMT()
69 {
70 char c, line[256];
71 char *pline = line;
72 char reply;
73
74 read(fildes[0], &c, 1);
75 while (c != '\n' && pline - line < sizeof(line)) {
76 *pline++ = c;
77 read(fildes[0], &c, 1);
78 }
79 *pline = '\0';
80 if (boolean(value(SCRIPT)) && fscript != NULL)
81 fclose(fscript);
82 if (pline == line) {
83 setboolean(value(SCRIPT), FALSE);
84 reply = 'y';
85 } else {
86 if ((fscript = fopen(line, "a")) == NULL)
87 reply = 'n';
88 else {
89 reply = 'y';
90 setboolean(value(SCRIPT), TRUE);
91 }
92 }
93 write(repdes[1], &reply, 1);
94 longjmp(sigbuf, 1);
95 }
96
97 void
intTERM(int signo)98 intTERM(int signo)
99 {
100
101 if (boolean(value(SCRIPT)) && fscript != NULL)
102 fclose(fscript);
103 if (signo && tipin_pid)
104 kill(tipin_pid, signo);
105 exit(0);
106 }
107
108 void
intSYS()109 intSYS()
110 {
111
112 setboolean(value(BEAUTIFY), !boolean(value(BEAUTIFY)));
113 longjmp(sigbuf, 1);
114 }
115
116 /*
117 * ****TIPOUT TIPOUT****
118 */
119 void
tipout()120 tipout()
121 {
122 char buf[BUFSIZ];
123 char *cp;
124 int cnt;
125 sigset_t mask, omask;
126
127 signal(SIGINT, SIG_IGN);
128 signal(SIGQUIT, SIG_IGN);
129 signal(SIGEMT, intEMT); /* attention from TIPIN */
130 signal(SIGTERM, intTERM); /* time to go signal */
131 signal(SIGIOT, intIOT); /* scripting going on signal */
132 signal(SIGHUP, intTERM); /* for dial-ups */
133 signal(SIGSYS, intSYS); /* beautify toggle */
134 (void) setjmp(sigbuf);
135 sigprocmask(SIG_BLOCK, NULL, &omask);
136 for (;;) {
137 sigprocmask(SIG_SETMASK, &omask, NULL);
138 cnt = read(FD, buf, BUFSIZ);
139 if (cnt <= 0) {
140 /* lost carrier */
141 if (cnt < 0 && errno == EIO) {
142 sigemptyset(&mask);
143 sigaddset(&mask, SIGTERM);
144 sigprocmask(SIG_BLOCK, &mask, NULL);
145 intTERM(0);
146 /*NOTREACHED*/
147 }
148 continue;
149 }
150 sigemptyset(&mask);
151 sigaddset(&mask, SIGEMT);
152 sigaddset(&mask, SIGTERM);
153 sigaddset(&mask, SIGIOT);
154 sigaddset(&mask, SIGSYS);
155 sigprocmask(SIG_BLOCK, &mask, NULL);
156 for (cp = buf; cp < buf + cnt; cp++)
157 *cp &= STRIP_PAR;
158 write(STDOUT_FILENO, buf, cnt);
159 if (boolean(value(SCRIPT)) && fscript != NULL) {
160 if (!boolean(value(BEAUTIFY))) {
161 fwrite(buf, 1, cnt, fscript);
162 continue;
163 }
164 for (cp = buf; cp < buf + cnt; cp++)
165 if ((*cp >= ' ' && *cp <= '~') ||
166 any(*cp, value(EXCEPTIONS)))
167 putc(*cp, fscript);
168 }
169 }
170 }
171