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
27#include <err.h>
28#include <errno.h>
29#include <net/if.h>
30#include <sys/ioctl.h>
31#include <limits.h>
32#include <stdio.h>
33#include <stdlib.h>
34#include <string.h>
35#include <libifconfig.h>
36
37
38int
39main(int argc, char *argv[])
40{
41	char *parentif, *ifactualname;
42	unsigned short vlantag;
43	const char *errstr;
44	ifconfig_handle_t *lifh;
45
46	if (argc != 3) {
47		errx(EINVAL, "Invalid number of arguments."
48		    " Should provide exactly two arguments: "
49		    "PARENT_INTERFACE and VLAN_TAG.");
50	}
51
52	/* We have a static number of arguments. Therefore we can do it simple. */
53	parentif = strdup(argv[1]);
54	vlantag = strtonum(argv[2], 0, USHRT_MAX, &errstr);
55
56	if (errstr != NULL) {
57		errx(1, "VLAN_TAG must be between 0 and %i.\n", USHRT_MAX);
58	}
59
60	printf("Parent interface: %s\nVLAN tag: %i\n", parentif, vlantag);
61
62	lifh = ifconfig_open();
63	if (lifh == NULL) {
64		errx(ENOMEM, "Failed to open libifconfig handle.");
65		return (-1);
66	}
67
68	if (ifconfig_create_interface_vlan(lifh, "vlan", &ifactualname,
69	    parentif, vlantag) == 0) {
70		printf("Successfully created interface '%s'\n", ifactualname);
71		ifconfig_close(lifh);
72		lifh = NULL;
73		free(parentif);
74		free(ifactualname);
75		return (0);
76	}
77
78	switch (ifconfig_err_errtype(lifh)) {
79	case SOCKET:
80		warnx("couldn't create socket. This shouldn't happen.\n");
81		break;
82	case IOCTL:
83		if (ifconfig_err_ioctlreq(lifh) == SIOCIFCREATE2) {
84			warnx(
85				"Failed to create interface (SIOCIFCREATE2)\n");
86		}
87		break;
88	default:
89		warnx(
90			"This is a thorough example accommodating for temporary"
91			" 'not implemented yet' errors. That's likely what happened"
92			" now. If not, your guess is as good as mine. ;)"
93			" Error code: %d\n", ifconfig_err_errno(
94				lifh));
95		break;
96	}
97
98	ifconfig_close(lifh);
99	lifh = NULL;
100	free(parentif);
101	free(ifactualname);
102	return (-1);
103}
104