1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1983, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/param.h>
33#include <sys/ioctl.h>
34#include <sys/queue.h>
35#include <sys/socket.h>
36#include <net/if.h>
37
38#include <err.h>
39#include <libifconfig.h>
40#include <stdio.h>
41#include <stdlib.h>
42#include <string.h>
43#include <unistd.h>
44
45#include "ifconfig.h"
46
47typedef enum {
48	MT_PREFIX,
49	MT_FILTER,
50} clone_match_type;
51
52static void
53list_cloners(void)
54{
55	char *cloners;
56	size_t cloners_count;
57
58	if (ifconfig_list_cloners(lifh, &cloners, &cloners_count) < 0)
59		errc(1, ifconfig_err_errno(lifh), "unable to list cloners");
60
61	for (const char *name = cloners;
62	    name < cloners + cloners_count * IFNAMSIZ;
63	    name += IFNAMSIZ) {
64		if (name > cloners)
65			putchar(' ');
66		printf("%s", name);
67	}
68	putchar('\n');
69	free(cloners);
70}
71
72struct clone_defcb {
73	union {
74		char ifprefix[IFNAMSIZ];
75		clone_match_func *ifmatch;
76	};
77	clone_match_type clone_mt;
78	clone_callback_func *clone_cb;
79	SLIST_ENTRY(clone_defcb) next;
80};
81
82static SLIST_HEAD(, clone_defcb) clone_defcbh =
83   SLIST_HEAD_INITIALIZER(clone_defcbh);
84
85void
86clone_setdefcallback_prefix(const char *ifprefix, clone_callback_func *p)
87{
88	struct clone_defcb *dcp;
89
90	dcp = malloc(sizeof(*dcp));
91	strlcpy(dcp->ifprefix, ifprefix, IFNAMSIZ-1);
92	dcp->clone_mt = MT_PREFIX;
93	dcp->clone_cb = p;
94	SLIST_INSERT_HEAD(&clone_defcbh, dcp, next);
95}
96
97void
98clone_setdefcallback_filter(clone_match_func *filter, clone_callback_func *p)
99{
100	struct clone_defcb *dcp;
101
102	dcp = malloc(sizeof(*dcp));
103	dcp->ifmatch  = filter;
104	dcp->clone_mt = MT_FILTER;
105	dcp->clone_cb = p;
106	SLIST_INSERT_HEAD(&clone_defcbh, dcp, next);
107}
108
109/*
110 * Do the actual clone operation.  Any parameters must have been
111 * setup by now.  If a callback has been setup to do the work
112 * then defer to it; otherwise do a simple create operation with
113 * no parameters.
114 */
115static void
116ifclonecreate(if_ctx *ctx, void *arg __unused)
117{
118	struct ifreq ifr = {};
119	struct clone_defcb *dcp;
120
121	strlcpy(ifr.ifr_name, ctx->ifname, sizeof(ifr.ifr_name));
122
123	/* Try to find a default callback by filter */
124	SLIST_FOREACH(dcp, &clone_defcbh, next) {
125		if (dcp->clone_mt == MT_FILTER &&
126		    dcp->ifmatch(ifr.ifr_name) != 0)
127			break;
128	}
129
130	if (dcp == NULL) {
131		/* Try to find a default callback by prefix */
132		SLIST_FOREACH(dcp, &clone_defcbh, next) {
133			if (dcp->clone_mt == MT_PREFIX &&
134			    strncmp(dcp->ifprefix, ifr.ifr_name,
135			    strlen(dcp->ifprefix)) == 0)
136				break;
137		}
138	}
139
140	if (dcp == NULL || dcp->clone_cb == NULL) {
141		/* NB: no parameters */
142		ifcreate_ioctl(ctx, &ifr);
143	} else {
144		dcp->clone_cb(ctx, &ifr);
145	}
146}
147
148static void
149clone_create(if_ctx *ctx __unused, const char *cmd __unused, int d __unused)
150{
151	callback_register(ifclonecreate, NULL);
152}
153
154static void
155clone_destroy(if_ctx *ctx, const char *cmd __unused, int d __unused)
156{
157	struct ifreq ifr = {};
158
159	if (ioctl_ctx_ifr(ctx, SIOCIFDESTROY, &ifr) < 0)
160		err(1, "SIOCIFDESTROY");
161}
162
163static struct cmd clone_cmds[] = {
164	DEF_CLONE_CMD("create",	0,	clone_create),
165	DEF_CMD("destroy",	0,	clone_destroy),
166	DEF_CLONE_CMD("plumb",	0,	clone_create),
167	DEF_CMD("unplumb",	0,	clone_destroy),
168};
169
170static void
171clone_Copt_cb(const char *arg __unused)
172{
173	list_cloners();
174	exit(exit_code);
175}
176static struct option clone_Copt = { .opt = "C", .opt_usage = "[-C]", .cb = clone_Copt_cb };
177
178static __constructor void
179clone_ctor(void)
180{
181	size_t i;
182
183	for (i = 0; i < nitems(clone_cmds);  i++)
184		cmd_register(&clone_cmds[i]);
185	opt_register(&clone_Copt);
186}
187