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  "$FreeBSD$";
33#endif /* not lint */
34
35#include <sys/queue.h>
36#include <sys/types.h>
37#include <sys/ioctl.h>
38#include <sys/socket.h>
39#include <net/if.h>
40
41#include <err.h>
42#include <stdio.h>
43#include <stdlib.h>
44#include <string.h>
45#include <unistd.h>
46
47#include "ifconfig.h"
48
49static void
50list_cloners(void)
51{
52	struct if_clonereq ifcr;
53	char *cp, *buf;
54	int idx;
55	int s;
56
57	s = socket(AF_LOCAL, SOCK_DGRAM, 0);
58	if (s == -1)
59		err(1, "socket(AF_LOCAL,SOCK_DGRAM)");
60
61	memset(&ifcr, 0, sizeof(ifcr));
62
63	if (ioctl(s, SIOCIFGCLONERS, &ifcr) < 0)
64		err(1, "SIOCIFGCLONERS for count");
65
66	buf = malloc(ifcr.ifcr_total * IFNAMSIZ);
67	if (buf == NULL)
68		err(1, "unable to allocate cloner name buffer");
69
70	ifcr.ifcr_count = ifcr.ifcr_total;
71	ifcr.ifcr_buffer = buf;
72
73	if (ioctl(s, SIOCIFGCLONERS, &ifcr) < 0)
74		err(1, "SIOCIFGCLONERS for names");
75
76	/*
77	 * In case some disappeared in the mean time, clamp it down.
78	 */
79	if (ifcr.ifcr_count > ifcr.ifcr_total)
80		ifcr.ifcr_count = ifcr.ifcr_total;
81
82	for (cp = buf, idx = 0; idx < ifcr.ifcr_count; idx++, cp += IFNAMSIZ) {
83		if (idx > 0)
84			putchar(' ');
85		printf("%s", cp);
86	}
87
88	putchar('\n');
89	free(buf);
90}
91
92struct clone_defcb {
93	char ifprefix[IFNAMSIZ];
94	clone_callback_func *clone_cb;
95	SLIST_ENTRY(clone_defcb) next;
96};
97
98static SLIST_HEAD(, clone_defcb) clone_defcbh =
99   SLIST_HEAD_INITIALIZER(clone_defcbh);
100
101void
102clone_setdefcallback(const char *ifprefix, clone_callback_func *p)
103{
104	struct clone_defcb *dcp;
105
106	dcp = malloc(sizeof(*dcp));
107	strlcpy(dcp->ifprefix, ifprefix, IFNAMSIZ-1);
108	dcp->clone_cb = p;
109	SLIST_INSERT_HEAD(&clone_defcbh, dcp, next);
110}
111
112/*
113 * Do the actual clone operation.  Any parameters must have been
114 * setup by now.  If a callback has been setup to do the work
115 * then defer to it; otherwise do a simple create operation with
116 * no parameters.
117 */
118static void
119ifclonecreate(int s, void *arg)
120{
121	struct ifreq ifr;
122	struct clone_defcb *dcp;
123	clone_callback_func *clone_cb = NULL;
124
125	memset(&ifr, 0, sizeof(ifr));
126	(void) strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
127
128	if (clone_cb == NULL) {
129		/* Try to find a default callback */
130		SLIST_FOREACH(dcp, &clone_defcbh, next) {
131			if (strncmp(dcp->ifprefix, ifr.ifr_name,
132			    strlen(dcp->ifprefix)) == 0) {
133				clone_cb = dcp->clone_cb;
134				break;
135			}
136		}
137	}
138	if (clone_cb == NULL) {
139		/* NB: no parameters */
140		if (ioctl(s, SIOCIFCREATE2, &ifr) < 0)
141			err(1, "SIOCIFCREATE2");
142	} else {
143		clone_cb(s, &ifr);
144	}
145
146	/*
147	 * If we get a different name back than we put in, print it.
148	 */
149	if (strncmp(name, ifr.ifr_name, sizeof(name)) != 0) {
150		strlcpy(name, ifr.ifr_name, sizeof(name));
151		printf("%s\n", name);
152	}
153}
154
155static
156DECL_CMD_FUNC(clone_create, arg, d)
157{
158	callback_register(ifclonecreate, NULL);
159}
160
161static
162DECL_CMD_FUNC(clone_destroy, arg, d)
163{
164	(void) strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
165	if (ioctl(s, SIOCIFDESTROY, &ifr) < 0)
166		err(1, "SIOCIFDESTROY");
167}
168
169static struct cmd clone_cmds[] = {
170	DEF_CLONE_CMD("create",	0,	clone_create),
171	DEF_CMD("destroy",	0,	clone_destroy),
172	DEF_CLONE_CMD("plumb",	0,	clone_create),
173	DEF_CMD("unplumb",	0,	clone_destroy),
174};
175
176static void
177clone_Copt_cb(const char *optarg __unused)
178{
179	list_cloners();
180	exit(0);
181}
182static struct option clone_Copt = { .opt = "C", .opt_usage = "[-C]", .cb = clone_Copt_cb };
183
184static __constructor void
185clone_ctor(void)
186{
187#define	N(a)	(sizeof(a) / sizeof(a[0]))
188	size_t i;
189
190	for (i = 0; i < N(clone_cmds);  i++)
191		cmd_register(&clone_cmds[i]);
192	opt_register(&clone_Copt);
193#undef N
194}
195