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 "tip.h" 36 37 /* 38 * tip 39 * 40 * lower fork of tip -- handles passive side 41 * reading from the remote host 42 */ 43 44 static jmp_buf sigbuf; 45 46 static void intIOT(int); 47 static void intEMT(int); 48 static void intTERM(int); 49 static void intSYS(int); 50 51 /* 52 * TIPOUT wait state routine -- 53 * sent by TIPIN when it wants to posses the remote host 54 */ 55 /*ARGSUSED*/ 56 static void 57 intIOT(int signo) 58 { 59 write(repdes[1],&ccc,1); 60 read(fildes[0], &ccc,1); 61 longjmp(sigbuf, 1); 62 } 63 64 /* 65 * Scripting command interpreter -- 66 * accepts script file name over the pipe and acts accordingly 67 */ 68 /*ARGSUSED*/ 69 static void 70 intEMT(int signo) 71 { 72 char c, line[256]; 73 char *pline = line; 74 char reply; 75 76 read(fildes[0], &c, 1); 77 while (c != '\n' && (size_t)(pline - line) < sizeof(line)) { 78 *pline++ = c; 79 read(fildes[0], &c, 1); 80 } 81 *pline = '\0'; 82 if (boolean(value(SCRIPT)) && fscript != NULL) 83 fclose(fscript); 84 if (pline == line) { 85 setboolean(value(SCRIPT), FALSE); 86 reply = 'y'; 87 } else { 88 if ((fscript = fopen(line, "a")) == NULL) 89 reply = 'n'; 90 else { 91 reply = 'y'; 92 setboolean(value(SCRIPT), TRUE); 93 } 94 } 95 write(repdes[1], &reply, 1); 96 longjmp(sigbuf, 1); 97 } 98 99 static void 100 intTERM(int signo) 101 { 102 if (boolean(value(SCRIPT)) && fscript != NULL) 103 fclose(fscript); 104 if (signo && tipin_pid) 105 kill(tipin_pid, signo); 106 exit(0); 107 } 108 109 /*ARGSUSED*/ 110 static void 111 intSYS(int signo) 112 { 113 setboolean(value(BEAUTIFY), !boolean(value(BEAUTIFY))); 114 longjmp(sigbuf, 1); 115 } 116 117 /* 118 * ****TIPOUT TIPOUT**** 119 */ 120 void 121 tipout(void) 122 { 123 char buf[BUFSIZ]; 124 char *cp; 125 ssize_t scnt; 126 size_t cnt; 127 sigset_t mask, omask; 128 129 signal(SIGINT, SIG_IGN); 130 signal(SIGQUIT, SIG_IGN); 131 signal(SIGEMT, intEMT); /* attention from TIPIN */ 132 signal(SIGTERM, intTERM); /* time to go signal */ 133 signal(SIGIOT, intIOT); /* scripting going on signal */ 134 signal(SIGHUP, intTERM); /* for dial-ups */ 135 signal(SIGSYS, intSYS); /* beautify toggle */ 136 (void) setjmp(sigbuf); 137 sigprocmask(SIG_BLOCK, NULL, &omask); 138 for (;;) { 139 sigprocmask(SIG_SETMASK, &omask, NULL); 140 scnt = read(FD, buf, BUFSIZ); 141 if (scnt <= 0) { 142 /* lost carrier */ 143 if (scnt == 0 || 144 (scnt < 0 && (errno == EIO || errno == ENXIO))) { 145 sigemptyset(&mask); 146 sigaddset(&mask, SIGTERM); 147 sigprocmask(SIG_BLOCK, &mask, NULL); 148 intTERM(SIGHUP); 149 /*NOTREACHED*/ 150 } 151 continue; 152 } 153 cnt = scnt; 154 sigemptyset(&mask); 155 sigaddset(&mask, SIGEMT); 156 sigaddset(&mask, SIGTERM); 157 sigaddset(&mask, SIGIOT); 158 sigaddset(&mask, SIGSYS); 159 sigprocmask(SIG_BLOCK, &mask, NULL); 160 for (cp = buf; cp < buf + cnt; cp++) 161 *cp &= STRIP_PAR; 162 write(STDOUT_FILENO, buf, cnt); 163 if (boolean(value(SCRIPT)) && fscript != NULL) { 164 if (!boolean(value(BEAUTIFY))) { 165 fwrite(buf, 1, cnt, fscript); 166 } else { 167 for (cp = buf; cp < buf + cnt; cp++) 168 if ((*cp >= ' ' && *cp <= '~') || 169 any(*cp, value(EXCEPTIONS))) 170 putc(*cp, fscript); 171 } 172 for (cp = buf; cp < buf + cnt; cp++) { 173 if (!isgraph(*cp)) { 174 fflush(fscript); 175 break; 176 } 177 } 178 } 179 } 180 } 181