1 /*
2  * Copyright (c) 2016-2017, 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 <arpa/inet.h>
28 #include <net/if.h>
29 
30 #include <err.h>
31 #include <errno.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 *ifname, *ifdescr, *curdescr;
42 	ifconfig_handle_t *lifh;
43 
44 	if (argc != 3) {
45 		errx(EINVAL, "Invalid number of arguments."
46 		    " First argument should be interface name, second argument"
47 		    " should be the description to set.");
48 	}
49 
50 	/* We have a static number of arguments. Therefore we can do it simple. */
51 	ifname = strdup(argv[1]);
52 	ifdescr = strdup(argv[2]);
53 	curdescr = NULL;
54 
55 	printf("Interface name: %s\n", ifname);
56 
57 	lifh = ifconfig_open();
58 	if (lifh == NULL) {
59 		errx(ENOMEM, "Failed to open libifconfig handle.");
60 		return (-1);
61 	}
62 
63 	if (ifconfig_get_description(lifh, ifname, &curdescr) == 0) {
64 		printf("Old description: %s\n", curdescr);
65 	}
66 
67 	printf("New description: %s\n\n", ifdescr);
68 
69 	if (ifconfig_set_description(lifh, ifname, ifdescr) == 0) {
70 		printf("New description successfully set.\n");
71 	} else {
72 		switch (ifconfig_err_errtype(lifh)) {
73 		case SOCKET:
74 			err(ifconfig_err_errno(lifh), "Socket error");
75 			break;
76 		case IOCTL:
77 			err(ifconfig_err_errno(
78 				    lifh), "IOCTL(%lu) error",
79 			    ifconfig_err_ioctlreq(lifh));
80 			break;
81 		default:
82 			err(ifconfig_err_errno(lifh), "Other error");
83 			break;
84 		}
85 	}
86 
87 	free(ifname);
88 	free(ifdescr);
89 	free(curdescr);
90 	ifname = NULL;
91 	ifdescr = NULL;
92 	curdescr = NULL;
93 
94 	ifconfig_close(lifh);
95 	return (0);
96 }
97