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