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/stat.h> 48 #include <sys/types.h> 49 50 #include <capsicum_helpers.h> 51 #include <err.h> 52 #include <errno.h> 53 #include <fcntl.h> 54 #include <signal.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <unistd.h> 59 60 typedef struct _list { 61 struct _list *next; 62 int fd; 63 const char *name; 64 } LIST; 65 static LIST *head; 66 67 static void add(int, const char *); 68 static void usage(void); 69 70 int 71 main(int argc, char *argv[]) 72 { 73 LIST *p; 74 int n, fd, rval, wval; 75 char *bp; 76 int append, ch, exitval; 77 char *buf; 78 #define BSIZE (8 * 1024) 79 80 append = 0; 81 while ((ch = getopt(argc, argv, "ai")) != -1) 82 switch((char)ch) { 83 case 'a': 84 append = 1; 85 break; 86 case 'i': 87 (void)signal(SIGINT, SIG_IGN); 88 break; 89 case '?': 90 default: 91 usage(); 92 } 93 argv += optind; 94 argc -= optind; 95 96 if ((buf = malloc(BSIZE)) == NULL) 97 err(1, "malloc"); 98 99 if (caph_limit_stdin() == -1 || caph_limit_stderr() == -1) 100 err(EXIT_FAILURE, "unable to limit stdio"); 101 102 add(STDOUT_FILENO, "stdout"); 103 104 for (exitval = 0; *argv; ++argv) 105 if ((fd = open(*argv, append ? O_WRONLY|O_CREAT|O_APPEND : 106 O_WRONLY|O_CREAT|O_TRUNC, DEFFILEMODE)) < 0) { 107 warn("%s", *argv); 108 exitval = 1; 109 } else 110 add(fd, *argv); 111 112 if (caph_enter() < 0) 113 err(EXIT_FAILURE, "unable to enter capability mode"); 114 while ((rval = read(STDIN_FILENO, buf, BSIZE)) > 0) 115 for (p = head; p; p = p->next) { 116 n = rval; 117 bp = buf; 118 do { 119 if ((wval = write(p->fd, bp, n)) == -1) { 120 warn("%s", p->name); 121 exitval = 1; 122 break; 123 } 124 bp += wval; 125 } while (n -= wval); 126 } 127 if (rval < 0) 128 err(1, "read"); 129 exit(exitval); 130 } 131 132 static void 133 usage(void) 134 { 135 (void)fprintf(stderr, "usage: tee [-ai] [file ...]\n"); 136 exit(1); 137 } 138 139 static void 140 add(int fd, const char *name) 141 { 142 LIST *p; 143 cap_rights_t rights; 144 145 if (fd == STDOUT_FILENO) { 146 if (caph_limit_stdout() == -1) 147 err(EXIT_FAILURE, "unable to limit stdout"); 148 } else { 149 cap_rights_init(&rights, CAP_WRITE, CAP_FSTAT); 150 if (caph_rights_limit(fd, &rights) < 0) 151 err(EXIT_FAILURE, "unable to limit rights"); 152 } 153 154 if ((p = malloc(sizeof(LIST))) == NULL) 155 err(1, "malloc"); 156 p->fd = fd; 157 p->name = name; 158 p->next = head; 159 head = p; 160 } 161