161 lines
4.1 KiB
C
161 lines
4.1 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1988, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)tee.c 8.1 (Berkeley) 6/6/93";
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#endif
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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#include <sys/capsicum.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <capsicum_helpers.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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typedef struct _list {
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struct _list *next;
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int fd;
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const char *name;
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} LIST;
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static LIST *head;
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static void add(int, const char *);
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static void usage(void);
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int
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main(int argc, char *argv[])
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{
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LIST *p;
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int n, fd, rval, wval;
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char *bp;
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int append, ch, exitval;
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char *buf;
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#define BSIZE (8 * 1024)
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append = 0;
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while ((ch = getopt(argc, argv, "ai")) != -1)
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switch((char)ch) {
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case 'a':
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append = 1;
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break;
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case 'i':
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(void)signal(SIGINT, SIG_IGN);
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break;
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case '?':
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default:
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usage();
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}
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argv += optind;
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argc -= optind;
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if ((buf = malloc(BSIZE)) == NULL)
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err(1, "malloc");
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if (caph_limit_stdin() == -1 || caph_limit_stderr() == -1)
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err(EXIT_FAILURE, "unable to limit stdio");
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add(STDOUT_FILENO, "stdout");
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for (exitval = 0; *argv; ++argv)
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if ((fd = open(*argv, append ? O_WRONLY|O_CREAT|O_APPEND :
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O_WRONLY|O_CREAT|O_TRUNC, DEFFILEMODE)) < 0) {
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warn("%s", *argv);
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exitval = 1;
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} else
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add(fd, *argv);
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if (caph_enter() < 0)
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err(EXIT_FAILURE, "unable to enter capability mode");
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while ((rval = read(STDIN_FILENO, buf, BSIZE)) > 0)
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for (p = head; p; p = p->next) {
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n = rval;
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bp = buf;
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do {
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if ((wval = write(p->fd, bp, n)) == -1) {
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warn("%s", p->name);
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exitval = 1;
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break;
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}
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bp += wval;
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} while (n -= wval);
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}
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if (rval < 0)
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err(1, "read");
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exit(exitval);
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr, "usage: tee [-ai] [file ...]\n");
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exit(1);
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}
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static void
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add(int fd, const char *name)
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{
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LIST *p;
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cap_rights_t rights;
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if (fd == STDOUT_FILENO) {
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if (caph_limit_stdout() == -1)
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err(EXIT_FAILURE, "unable to limit stdout");
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} else {
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cap_rights_init(&rights, CAP_WRITE, CAP_FSTAT);
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if (caph_rights_limit(fd, &rights) < 0)
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err(EXIT_FAILURE, "unable to limit rights");
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}
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if ((p = malloc(sizeof(LIST))) == NULL)
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err(1, "malloc");
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p->fd = fd;
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p->name = name;
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p->next = head;
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head = p;
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}
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