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 * 4. 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 <err.h> 49 #include <errno.h> 50 #include <fcntl.h> 51 #include <signal.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <string.h> 55 #include <termios.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 cap_rights_t rights; 77 unsigned long cmd; 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 cap_rights_init(&rights, CAP_READ, CAP_FSTAT); 100 if (cap_rights_limit(STDIN_FILENO, &rights) < 0 && errno != ENOSYS) 101 err(EXIT_FAILURE, "unable to limit rights for stdin"); 102 cap_rights_init(&rights, CAP_WRITE, CAP_FSTAT, CAP_IOCTL); 103 if (cap_rights_limit(STDERR_FILENO, &rights) < 0 && errno != ENOSYS) 104 err(EXIT_FAILURE, "unable to limit rights for stderr"); 105 cmd = TIOCGETA; 106 if (cap_ioctls_limit(STDERR_FILENO, &cmd, 1) < 0 && errno != ENOSYS) 107 err(EXIT_FAILURE, "unable to limit ioctls for stderr"); 108 109 add(STDOUT_FILENO, "stdout"); 110 111 for (exitval = 0; *argv; ++argv) 112 if ((fd = open(*argv, append ? O_WRONLY|O_CREAT|O_APPEND : 113 O_WRONLY|O_CREAT|O_TRUNC, DEFFILEMODE)) < 0) { 114 warn("%s", *argv); 115 exitval = 1; 116 } else 117 add(fd, *argv); 118 119 if (cap_enter() < 0 && errno != ENOSYS) 120 err(EXIT_FAILURE, "unable to enter capability mode"); 121 while ((rval = read(STDIN_FILENO, buf, BSIZE)) > 0) 122 for (p = head; p; p = p->next) { 123 n = rval; 124 bp = buf; 125 do { 126 if ((wval = write(p->fd, bp, n)) == -1) { 127 warn("%s", p->name); 128 exitval = 1; 129 break; 130 } 131 bp += wval; 132 } while (n -= wval); 133 } 134 if (rval < 0) 135 err(1, "read"); 136 exit(exitval); 137 } 138 139 static void 140 usage(void) 141 { 142 (void)fprintf(stderr, "usage: tee [-ai] [file ...]\n"); 143 exit(1); 144 } 145 146 static void 147 add(int fd, const char *name) 148 { 149 LIST *p; 150 cap_rights_t rights; 151 unsigned long cmd; 152 153 if (fd == STDOUT_FILENO) 154 cap_rights_init(&rights, CAP_WRITE, CAP_FSTAT, CAP_IOCTL); 155 else 156 cap_rights_init(&rights, CAP_WRITE, CAP_FSTAT); 157 if (cap_rights_limit(fd, &rights) < 0 && errno != ENOSYS) 158 err(EXIT_FAILURE, "unable to limit rights"); 159 160 if (fd == STDOUT_FILENO) { 161 cmd = TIOCGETA; 162 if (cap_ioctls_limit(fd, &cmd, 1) < 0 && errno != ENOSYS) 163 err(EXIT_FAILURE, "unable to limit ioctls for stdout"); 164 } 165 166 if ((p = malloc(sizeof(LIST))) == NULL) 167 err(1, "malloc"); 168 p->fd = fd; 169 p->name = name; 170 p->next = head; 171 head = p; 172 } 173