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 #endif /* not lint */ 40 41 #include <sys/capsicum.h> 42 #include <sys/queue.h> 43 #include <sys/stat.h> 44 #include <sys/types.h> 45 46 #include <capsicum_helpers.h> 47 #include <err.h> 48 #include <errno.h> 49 #include <fcntl.h> 50 #include <signal.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <unistd.h> 55 56 struct entry { 57 int fd; 58 const char *name; 59 STAILQ_ENTRY(entry) entries; 60 }; 61 static STAILQ_HEAD(, entry) head = STAILQ_HEAD_INITIALIZER(head); 62 63 static void add(int, const char *); 64 static void usage(void) __dead2; 65 66 int 67 main(int argc, char *argv[]) 68 { 69 struct entry *p; 70 int n, fd, rval, wval; 71 char *bp; 72 int append, ch, exitval; 73 char *buf; 74 #define BSIZE (8 * 1024) 75 76 append = 0; 77 while ((ch = getopt(argc, argv, "ai")) != -1) 78 switch((char)ch) { 79 case 'a': 80 append = 1; 81 break; 82 case 'i': 83 (void)signal(SIGINT, SIG_IGN); 84 break; 85 case '?': 86 default: 87 usage(); 88 } 89 argv += optind; 90 argc -= optind; 91 92 if ((buf = malloc(BSIZE)) == NULL) 93 err(1, "malloc"); 94 95 if (caph_limit_stdin() == -1 || caph_limit_stderr() == -1) 96 err(EXIT_FAILURE, "unable to limit stdio"); 97 98 add(STDOUT_FILENO, "stdout"); 99 100 for (exitval = 0; *argv; ++argv) 101 if ((fd = open(*argv, append ? O_WRONLY|O_CREAT|O_APPEND : 102 O_WRONLY|O_CREAT|O_TRUNC, DEFFILEMODE)) < 0) { 103 warn("%s", *argv); 104 exitval = 1; 105 } else 106 add(fd, *argv); 107 108 if (caph_enter() < 0) 109 err(EXIT_FAILURE, "unable to enter capability mode"); 110 while ((rval = read(STDIN_FILENO, buf, BSIZE)) > 0) 111 STAILQ_FOREACH(p, &head, entries) { 112 n = rval; 113 bp = buf; 114 do { 115 if ((wval = write(p->fd, bp, n)) == -1) { 116 warn("%s", p->name); 117 exitval = 1; 118 break; 119 } 120 bp += wval; 121 } while (n -= wval); 122 } 123 if (rval < 0) 124 err(1, "read"); 125 exit(exitval); 126 } 127 128 static void 129 usage(void) 130 { 131 (void)fprintf(stderr, "usage: tee [-ai] [file ...]\n"); 132 exit(1); 133 } 134 135 static void 136 add(int fd, const char *name) 137 { 138 struct entry *p; 139 cap_rights_t rights; 140 141 if (fd == STDOUT_FILENO) { 142 if (caph_limit_stdout() == -1) 143 err(EXIT_FAILURE, "unable to limit stdout"); 144 } else { 145 cap_rights_init(&rights, CAP_WRITE, CAP_FSTAT); 146 if (caph_rights_limit(fd, &rights) < 0) 147 err(EXIT_FAILURE, "unable to limit rights"); 148 } 149 150 if ((p = malloc(sizeof(struct entry))) == NULL) 151 err(1, "malloc"); 152 p->fd = fd; 153 p->name = name; 154 STAILQ_INSERT_HEAD(&head, p, entries); 155 } 156