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 #include <net/if_vlan_var.h>
38
39 int
main(int argc,char * argv[])40 main(int argc, char *argv[])
41 {
42 char *ifname, *parentif;
43 unsigned short vlantag;
44 const char *errstr;
45 ifconfig_handle_t *lifh;
46
47 if (argc != 4) {
48 errx(EINVAL, "Invalid number of arguments."
49 " Should provide exactly three arguments: "
50 "INTERFACE, PARENT_INTERFACE and VLAN_TAG.");
51 }
52
53 /* We have a static number of arguments. Therefore we can do it simple. */
54 ifname = strdup(argv[1]);
55 parentif = strdup(argv[2]);
56 vlantag = strtonum(argv[3], 0, USHRT_MAX, &errstr);
57
58 if (errstr != NULL) {
59 errx(1, "VLAN_TAG must be between 0 and %i.\n", USHRT_MAX);
60 }
61
62 printf("Interface: %s\nNew VLAN tag: %i\n", ifname, vlantag);
63
64 lifh = ifconfig_open();
65 if (lifh == NULL) {
66 errx(ENOMEM, "Failed to open libifconfig handle.");
67 return (-1);
68 }
69
70 if (ifconfig_set_vlantag(lifh, ifname, parentif, vlantag) == 0) {
71 printf("Successfully changed vlan tag.\n");
72 ifconfig_close(lifh);
73 lifh = NULL;
74 free(ifname);
75 free(parentif);
76 return (0);
77 }
78
79 switch (ifconfig_err_errtype(lifh)) {
80 case SOCKET:
81 warnx("couldn't create socket. This shouldn't happen.\n");
82 break;
83 case IOCTL:
84 if (ifconfig_err_ioctlreq(lifh) == SIOCGETVLAN) {
85 warnx("Target interface isn't a VLAN interface.\n");
86 }
87 if (ifconfig_err_ioctlreq(lifh) == SIOCSETVLAN) {
88 warnx(
89 "Couldn't change VLAN properties of interface.\n");
90 }
91 break;
92 default:
93 warnx(
94 "This is a thorough example accommodating for temporary"
95 " 'not implemented yet' errors. That's likely what happened"
96 " now. If not, your guess is as good as mine. ;)"
97 " Error code: %d\n", ifconfig_err_errno(
98 lifh));
99 break;
100 }
101
102 ifconfig_close(lifh);
103 lifh = NULL;
104 free(ifname);
105 free(parentif);
106 return (-1);
107 }
108