1/*
2 * Copyright (c) 1983, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#ifndef lint
31static const char rcsid[] =
32  "$FreeBSD: src/sbin/ifconfig/ifclone.c,v 1.3.2.1.2.1 2008/11/25 02:59:29 kensmith Exp $";
33#endif /* not lint */
34
35#include <sys/types.h>
36#include <sys/ioctl.h>
37#include <sys/socket.h>
38#include <net/if.h>
39
40#include <err.h>
41#include <stdio.h>
42#include <stdlib.h>
43#include <string.h>
44#include <unistd.h>
45
46#include "ifconfig.h"
47
48static void
49list_cloners(void)
50{
51	struct if_clonereq ifcr;
52	char *cp, *buf;
53	int idx;
54	int s;
55
56	s = socket(AF_INET, SOCK_DGRAM, 0);
57	if (s == -1)
58		err(1, "socket(AF_INET,SOCK_DGRAM)");
59
60	memset(&ifcr, 0, sizeof(ifcr));
61
62	if (ioctl(s, SIOCIFGCLONERS, &ifcr) < 0)
63		err(1, "SIOCIFGCLONERS for count");
64
65	buf = malloc(ifcr.ifcr_total * IFNAMSIZ);
66	if (buf == NULL)
67		err(1, "unable to allocate cloner name buffer");
68
69	ifcr.ifcr_count = ifcr.ifcr_total;
70	ifcr.ifcr_buffer = buf;
71
72	if (ioctl(s, SIOCIFGCLONERS, &ifcr) < 0)
73		err(1, "SIOCIFGCLONERS for names");
74
75	/*
76	 * In case some disappeared in the mean time, clamp it down.
77	 */
78	if (ifcr.ifcr_count > ifcr.ifcr_total)
79		ifcr.ifcr_count = ifcr.ifcr_total;
80
81	for (cp = buf, idx = 0; idx < ifcr.ifcr_count; idx++, cp += IFNAMSIZ) {
82		if (idx > 0)
83			putchar(' ');
84		printf("%s", cp);
85	}
86
87	putchar('\n');
88	free(buf);
89}
90
91static clone_callback_func *clone_cb = NULL;
92
93void
94clone_setcallback(clone_callback_func *p)
95{
96	if (clone_cb != NULL && clone_cb != p)
97		errx(1, "conflicting device create parameters");
98	clone_cb = p;
99}
100
101/*
102 * Do the actual clone operation.  Any parameters must have been
103 * setup by now.  If a callback has been setup to do the work
104 * then defer to it; otherwise do a simple create operation with
105 * no parameters.
106 */
107static void
108ifclonecreate(int s, void *arg)
109{
110	struct ifreq ifr;
111
112	memset(&ifr, 0, sizeof(ifr));
113	(void) strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
114	if (clone_cb == NULL) {
115#ifdef SIOCIFCREATE2
116		/* NB: no parameters */
117		if (ioctl(s, SIOCIFCREATE2, &ifr) < 0)
118			err(1, "SIOCIFCREATE2");
119#else
120		if (ioctl(s, SIOCIFCREATE, &ifr) < 0)
121			err(1, "SIOCIFCREATE");
122#endif
123	} else {
124		clone_cb(s, &ifr);
125	}
126
127	/*
128	 * If we get a different name back than we put in, print it.
129	 */
130	if (strncmp(name, ifr.ifr_name, sizeof(name)) != 0) {
131		strlcpy(name, ifr.ifr_name, sizeof(name));
132		printf("%s\n", name);
133	}
134}
135
136static
137DECL_CMD_FUNC(clone_create, arg, d)
138{
139	callback_register(ifclonecreate, NULL);
140}
141
142static
143DECL_CMD_FUNC(clone_destroy, arg, d)
144{
145	(void) strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
146	if (ioctl(s, SIOCIFDESTROY, &ifr) < 0)
147		err(1, "SIOCIFDESTROY");
148}
149
150static struct cmd clone_cmds[] = {
151	DEF_CLONE_CMD("create",	0,	clone_create),
152	DEF_CMD("destroy",	0,	clone_destroy),
153	DEF_CLONE_CMD("plumb",	0,	clone_create),
154	DEF_CMD("unplumb",	0,	clone_destroy),
155};
156
157static void
158clone_Copt_cb(const char *optarg __unused)
159{
160	list_cloners();
161	exit(0);
162}
163static struct option clone_Copt = { "C", "[-C]", clone_Copt_cb };
164
165static __constructor void
166clone_ctor(void)
167{
168#define	N(a)	(sizeof(a) / sizeof(a[0]))
169	int i;
170
171	for (i = 0; i < N(clone_cmds);  i++)
172		cmd_register(&clone_cmds[i]);
173	opt_register(&clone_Copt);
174#undef N
175}
176