setfib.c revision 180784 
1/*
2 * Copyright (c) 1989, 1993, 1994
3 *	The Regents of the University of California.  All rights reserved.
4 * Copyright (c) 2008 Cisco Systems, All rights reserved
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 4. Neither the name of the University nor the names of its contributors
15 *    may be used to endorse or promote products derived from this software
16 *    without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 *
30 * setfib file skelaton taken from nice.c
31 */
32
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD: head/usr.sbin/setfib/setfib.c 180784 2008-07-24 18:01:50Z julian $");
35
36
37#include <errno.h>
38#include <limits.h>
39#include <stdio.h>
40#include <stdlib.h>
41#include <unistd.h>
42#include <sys/sysctl.h>
43
44void usage(void);
45
46int
47main(int argc, char *argv[])
48{
49	long fib = 0;
50	int ch;
51	char *ep;
52	int	numfibs;
53	size_t intsize = sizeof(int);
54
55        if (sysctlbyname("net.fibs", &numfibs, &intsize, NULL, 0) == -1)
56		errx(1, "Multiple FIBS not supported");
57	if (argc < 2)
58		usage();
59	ep = argv[1];
60	/*
61	 * convert -N or N to -FN. (N is a number)
62	 */
63	if (ep[0]== '-' && isdigit((unsigned char)ep[1]))
64		ep++;
65	if (isdigit((unsigned char)*ep))
66               if (asprintf(&argv[1], "-F%s", ep) < 0)
67                        err(1, "asprintf");
68
69	while ((ch = getopt(argc, argv, "F:")) != -1) {
70		switch (ch) {
71		case 'F':
72			errno = 0;
73			fib = strtol(optarg, &ep, 10);
74			if (ep == optarg || *ep != '\0' || errno ||
75			    fib < 0 || fib >= numfibs)
76				errx(1, "%s: invalid FIB (max %s)",
77				    optarg, numfibs - 1);
78			break;
79		default:
80			usage();
81		}
82	}
83	argc -= optind;
84	argv += optind;
85
86	if (argc == 0)
87		usage();
88
89	errno = 0;
90	if (setfib((int)fib))
91		warn("setfib");
92	execvp(*argv, argv);
93	err(errno == ENOENT ? 127 : 126, "%s", *argv);
94}
95
96void
97usage(void)
98{
99
100	(void)fprintf(stderr,
101	    "usage: setfib [-[F]]value command\n");
102	exit(1);
103}
104