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("$FreeBSD$"); 35 36 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)tipout.c 8.1 (Berkeley) 6/6/93"; 39 static 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 52 static jmp_buf sigbuf; 53 54 static void intIOT(int); 55 static void intEMT(int); 56 static void intTERM(int); 57 static 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*/ 64 static void 65 intIOT(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*/ 77 static void 78 intEMT(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 } 106 107 static void 108 intTERM(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*/ 118 static void 119 intSYS(int signo) 120 { 121 setboolean(value(BEAUTIFY), !boolean(value(BEAUTIFY))); 122 longjmp(sigbuf, 1); 123 } 124 125 /* 126 * ****TIPOUT TIPOUT**** 127 */ 128 void 129 tipout(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 || (scnt < 0 && errno == EIO)) { 152 sigemptyset(&mask); 153 sigaddset(&mask, SIGTERM); 154 sigprocmask(SIG_BLOCK, &mask, NULL); 155 intTERM(0); 156 /*NOTREACHED*/ 157 } 158 continue; 159 } 160 cnt = scnt; 161 sigemptyset(&mask); 162 sigaddset(&mask, SIGEMT); 163 sigaddset(&mask, SIGTERM); 164 sigaddset(&mask, SIGIOT); 165 sigaddset(&mask, SIGSYS); 166 sigprocmask(SIG_BLOCK, &mask, NULL); 167 for (cp = buf; cp < buf + cnt; cp++) 168 *cp &= STRIP_PAR; 169 write(STDOUT_FILENO, buf, cnt); 170 if (boolean(value(SCRIPT)) && fscript != NULL) { 171 if (!boolean(value(BEAUTIFY))) { 172 fwrite(buf, 1, cnt, fscript); 173 continue; 174 } 175 for (cp = buf; cp < buf + cnt; cp++) 176 if ((*cp >= ' ' && *cp <= '~') || 177 any(*cp, value(EXCEPTIONS))) 178 putc(*cp, fscript); 179 } 180 } 181 } 182