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 
38 int
39 main(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