1/*
2 * Copyright (c) 2017, Marie Helene Kvello-Aune
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without modification,
6 * are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice,
9 * thislist of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation and/or
13 * other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
17 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 *
26 * $FreeBSD$
27 */
28
29#include <err.h>
30#include <errno.h>
31#include <net/if.h>
32#include <sys/ioctl.h>
33#include <limits.h>
34#include <stdio.h>
35#include <stdlib.h>
36#include <string.h>
37#include <libifconfig.h>
38
39#include <net/if_vlan_var.h>
40
41int
42main(int argc, char *argv[])
43{
44	char *ifname, *parentif;
45	unsigned short vlantag;
46	const char *errstr;
47	ifconfig_handle_t *lifh;
48
49	if (argc != 4) {
50		errx(EINVAL, "Invalid number of arguments."
51		    " Should provide exactly three arguments: "
52		    "INTERFACE, PARENT_INTERFACE and VLAN_TAG.");
53	}
54
55	/* We have a static number of arguments. Therefore we can do it simple. */
56	ifname = strdup(argv[1]);
57	parentif = strdup(argv[2]);
58	vlantag = strtonum(argv[3], 0, USHRT_MAX, &errstr);
59
60	if (errstr != NULL) {
61		errx(1, "VLAN_TAG must be between 0 and %i.\n", USHRT_MAX);
62	}
63
64	printf("Interface: %s\nNew VLAN tag: %i\n", ifname, vlantag);
65
66	lifh = ifconfig_open();
67	if (lifh == NULL) {
68		errx(ENOMEM, "Failed to open libifconfig handle.");
69		return (-1);
70	}
71
72	if (ifconfig_set_vlantag(lifh, ifname, parentif, vlantag) == 0) {
73		printf("Successfully changed vlan tag.\n");
74		ifconfig_close(lifh);
75		lifh = NULL;
76		free(ifname);
77		free(parentif);
78		return (0);
79	}
80
81	switch (ifconfig_err_errtype(lifh)) {
82	case SOCKET:
83		warnx("couldn't create socket. This shouldn't happen.\n");
84		break;
85	case IOCTL:
86		if (ifconfig_err_ioctlreq(lifh) == SIOCGETVLAN) {
87			warnx("Target interface isn't a VLAN interface.\n");
88		}
89		if (ifconfig_err_ioctlreq(lifh) == SIOCSETVLAN) {
90			warnx(
91				"Couldn't change VLAN properties of interface.\n");
92		}
93		break;
94	default:
95		warnx(
96			"This is a thorough example accommodating for temporary"
97			" 'not implemented yet' errors. That's likely what happened"
98			" now. If not, your guess is as good as mine. ;)"
99			" Error code: %d\n", ifconfig_err_errno(
100				lifh));
101		break;
102	}
103
104	ifconfig_close(lifh);
105	lifh = NULL;
106	free(ifname);
107	free(parentif);
108	return (-1);
109}
110