1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1988, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #ifndef lint 33 static const char copyright[] = 34 "@(#) Copyright (c) 1988, 1993\n\ 35 The Regents of the University of California. All rights reserved.\n"; 36 #endif /* not lint */ 37 38 #ifndef lint 39 #if 0 40 static char sccsid[] = "@(#)tee.c 8.1 (Berkeley) 6/6/93"; 41 #endif 42 static const char rcsid[] = 43 "$FreeBSD$"; 44 #endif /* not lint */ 45 46 #include <sys/capsicum.h> 47 #include <sys/queue.h> 48 #include <sys/stat.h> 49 #include <sys/types.h> 50 51 #include <capsicum_helpers.h> 52 #include <err.h> 53 #include <errno.h> 54 #include <fcntl.h> 55 #include <signal.h> 56 #include <stdio.h> 57 #include <stdlib.h> 58 #include <string.h> 59 #include <unistd.h> 60 61 struct entry { 62 int fd; 63 const char *name; 64 STAILQ_ENTRY(entry) entries; 65 }; 66 static STAILQ_HEAD(, entry) head = STAILQ_HEAD_INITIALIZER(head); 67 68 static void add(int, const char *); 69 static void usage(void) __dead2; 70 71 int 72 main(int argc, char *argv[]) 73 { 74 struct entry *p; 75 int n, fd, rval, wval; 76 char *bp; 77 int append, ch, exitval; 78 char *buf; 79 #define BSIZE (8 * 1024) 80 81 append = 0; 82 while ((ch = getopt(argc, argv, "ai")) != -1) 83 switch((char)ch) { 84 case 'a': 85 append = 1; 86 break; 87 case 'i': 88 (void)signal(SIGINT, SIG_IGN); 89 break; 90 case '?': 91 default: 92 usage(); 93 } 94 argv += optind; 95 argc -= optind; 96 97 if ((buf = malloc(BSIZE)) == NULL) 98 err(1, "malloc"); 99 100 if (caph_limit_stdin() == -1 || caph_limit_stderr() == -1) 101 err(EXIT_FAILURE, "unable to limit stdio"); 102 103 add(STDOUT_FILENO, "stdout"); 104 105 for (exitval = 0; *argv; ++argv) 106 if ((fd = open(*argv, append ? O_WRONLY|O_CREAT|O_APPEND : 107 O_WRONLY|O_CREAT|O_TRUNC, DEFFILEMODE)) < 0) { 108 warn("%s", *argv); 109 exitval = 1; 110 } else 111 add(fd, *argv); 112 113 if (caph_enter() < 0) 114 err(EXIT_FAILURE, "unable to enter capability mode"); 115 while ((rval = read(STDIN_FILENO, buf, BSIZE)) > 0) 116 STAILQ_FOREACH(p, &head, entries) { 117 n = rval; 118 bp = buf; 119 do { 120 if ((wval = write(p->fd, bp, n)) == -1) { 121 warn("%s", p->name); 122 exitval = 1; 123 break; 124 } 125 bp += wval; 126 } while (n -= wval); 127 } 128 if (rval < 0) 129 err(1, "read"); 130 exit(exitval); 131 } 132 133 static void 134 usage(void) 135 { 136 (void)fprintf(stderr, "usage: tee [-ai] [file ...]\n"); 137 exit(1); 138 } 139 140 static void 141 add(int fd, const char *name) 142 { 143 struct entry *p; 144 cap_rights_t rights; 145 146 if (fd == STDOUT_FILENO) { 147 if (caph_limit_stdout() == -1) 148 err(EXIT_FAILURE, "unable to limit stdout"); 149 } else { 150 cap_rights_init(&rights, CAP_WRITE, CAP_FSTAT); 151 if (caph_rights_limit(fd, &rights) < 0) 152 err(EXIT_FAILURE, "unable to limit rights"); 153 } 154 155 if ((p = malloc(sizeof(struct entry))) == NULL) 156 err(1, "malloc"); 157 p->fd = fd; 158 p->name = name; 159 STAILQ_INSERT_HEAD(&head, p, entries); 160 } 161