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#include <sys/types.h>
31#include <sys/ioctl.h>
32#include <sys/socket.h>
33#include <net/if.h>
34
35#include <err.h>
36#include <stdio.h>
37#include <stdlib.h>
38#include <string.h>
39#include <unistd.h>
40
41#include "ifconfig.h"
42
43static void
44list_cloners(void)
45{
46	struct if_clonereq ifcr;
47	char *cp, *buf;
48	int idx;
49	int s;
50
51	s = socket(AF_INET, SOCK_DGRAM, 0);
52	if (s == -1)
53		err(1, "socket(AF_INET,SOCK_DGRAM)");
54
55	memset(&ifcr, 0, sizeof(ifcr));
56
57	if (ioctl(s, SIOCIFGCLONERS, &ifcr) < 0)
58		err(1, "SIOCIFGCLONERS for count");
59
60	buf = malloc(ifcr.ifcr_total * IFNAMSIZ);
61	if (buf == NULL)
62		err(1, "unable to allocate cloner name buffer");
63
64	ifcr.ifcr_count = ifcr.ifcr_total;
65	ifcr.ifcr_buffer = buf;
66
67	if (ioctl(s, SIOCIFGCLONERS, &ifcr) < 0)
68		err(1, "SIOCIFGCLONERS for names");
69
70	/*
71	 * In case some disappeared in the mean time, clamp it down.
72	 */
73	if (ifcr.ifcr_count > ifcr.ifcr_total)
74		ifcr.ifcr_count = ifcr.ifcr_total;
75
76	for (cp = buf, idx = 0; idx < ifcr.ifcr_count; idx++, cp += IFNAMSIZ) {
77		if (idx > 0)
78			putchar(' ');
79		printf("%s", cp);
80	}
81
82	putchar('\n');
83	free(buf);
84}
85
86static clone_callback_func *clone_cb = NULL;
87
88void
89clone_setcallback(clone_callback_func *p)
90{
91	if (clone_cb != NULL && clone_cb != p)
92		errx(1, "conflicting device create parameters");
93	clone_cb = p;
94}
95
96/*
97 * Do the actual clone operation.  Any parameters must have been
98 * setup by now.  If a callback has been setup to do the work
99 * then defer to it; otherwise do a simple create operation with
100 * no parameters.
101 */
102static void
103ifclonecreate(int s, void *arg)
104{
105	struct ifreq ifr;
106
107	memset(&ifr, 0, sizeof(ifr));
108	(void) strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
109	if (clone_cb == NULL) {
110#ifdef SIOCIFCREATE2
111		/* NB: no parameters */
112		if (ioctl(s, SIOCIFCREATE2, &ifr) < 0)
113			err(1, "SIOCIFCREATE2");
114#else
115		if (ioctl(s, SIOCIFCREATE, &ifr) < 0)
116			err(1, "SIOCIFCREATE");
117#endif
118	} else {
119		clone_cb(s, &ifr);
120	}
121
122	/*
123	 * If we get a different name back than we put in, print it.
124	 */
125	if (strncmp(name, ifr.ifr_name, sizeof(name)) != 0) {
126		strlcpy(name, ifr.ifr_name, sizeof(name));
127		printf("%s\n", name);
128	}
129}
130
131static
132DECL_CMD_FUNC(clone_create, arg, d)
133{
134	callback_register(ifclonecreate, NULL);
135}
136
137static
138DECL_CMD_FUNC(clone_destroy, arg, d)
139{
140	(void) strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
141	if (ioctl(s, SIOCIFDESTROY, &ifr) < 0)
142		err(1, "SIOCIFDESTROY");
143}
144
145static struct cmd clone_cmds[] = {
146	DEF_CLONE_CMD("create",	0,	clone_create),
147	DEF_CMD("destroy",	0,	clone_destroy),
148	DEF_CLONE_CMD("plumb",	0,	clone_create),
149	DEF_CMD("unplumb",	0,	clone_destroy),
150};
151
152static void
153clone_Copt_cb(const char *optarg __unused)
154{
155	list_cloners();
156	exit(0);
157}
158static struct option clone_Copt = { "C", "[-C]", clone_Copt_cb };
159
160static __constructor void
161clone_ctor(void)
162{
163#define	N(a)	(sizeof(a) / sizeof(a[0]))
164	int i;
165
166	for (i = 0; i < N(clone_cmds);  i++)
167		cmd_register(&clone_cmds[i]);
168	opt_register(&clone_Copt);
169#undef N
170}
171