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