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 #ifndef lint
33 static const char rcsid[] =
34 "$FreeBSD$";
35 #endif /* not lint */
36
37 #include <sys/param.h>
38 #include <sys/ioctl.h>
39 #include <sys/queue.h>
40 #include <sys/socket.h>
41 #include <net/if.h>
42
43 #include <err.h>
44 #include <libifconfig.h>
45 #include <stdio.h>
46 #include <stdlib.h>
47 #include <string.h>
48 #include <unistd.h>
49
50 #include "ifconfig.h"
51
52 typedef enum {
53 MT_PREFIX,
54 MT_FILTER,
55 } clone_match_type;
56
57 static void
list_cloners(void)58 list_cloners(void)
59 {
60 char *cloners;
61 size_t cloners_count;
62
63 if (ifconfig_list_cloners(lifh, &cloners, &cloners_count) < 0)
64 errc(1, ifconfig_err_errno(lifh), "unable to list cloners");
65
66 for (const char *name = cloners;
67 name < cloners + cloners_count * IFNAMSIZ;
68 name += IFNAMSIZ) {
69 if (name > cloners)
70 putchar(' ');
71 printf("%s", name);
72 }
73 putchar('\n');
74 free(cloners);
75 }
76
77 struct clone_defcb {
78 union {
79 char ifprefix[IFNAMSIZ];
80 clone_match_func *ifmatch;
81 };
82 clone_match_type clone_mt;
83 clone_callback_func *clone_cb;
84 SLIST_ENTRY(clone_defcb) next;
85 };
86
87 static SLIST_HEAD(, clone_defcb) clone_defcbh =
88 SLIST_HEAD_INITIALIZER(clone_defcbh);
89
90 void
clone_setdefcallback_prefix(const char * ifprefix,clone_callback_func * p)91 clone_setdefcallback_prefix(const char *ifprefix, clone_callback_func *p)
92 {
93 struct clone_defcb *dcp;
94
95 dcp = malloc(sizeof(*dcp));
96 strlcpy(dcp->ifprefix, ifprefix, IFNAMSIZ-1);
97 dcp->clone_mt = MT_PREFIX;
98 dcp->clone_cb = p;
99 SLIST_INSERT_HEAD(&clone_defcbh, dcp, next);
100 }
101
102 void
clone_setdefcallback_filter(clone_match_func * filter,clone_callback_func * p)103 clone_setdefcallback_filter(clone_match_func *filter, clone_callback_func *p)
104 {
105 struct clone_defcb *dcp;
106
107 dcp = malloc(sizeof(*dcp));
108 dcp->ifmatch = filter;
109 dcp->clone_mt = MT_FILTER;
110 dcp->clone_cb = p;
111 SLIST_INSERT_HEAD(&clone_defcbh, dcp, next);
112 }
113
114 /*
115 * Do the actual clone operation. Any parameters must have been
116 * setup by now. If a callback has been setup to do the work
117 * then defer to it; otherwise do a simple create operation with
118 * no parameters.
119 */
120 static void
ifclonecreate(int s,void * arg)121 ifclonecreate(int s, void *arg)
122 {
123 struct ifreq ifr;
124 struct clone_defcb *dcp;
125
126 memset(&ifr, 0, sizeof(ifr));
127 (void) strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
128
129 /* Try to find a default callback by filter */
130 SLIST_FOREACH(dcp, &clone_defcbh, next) {
131 if (dcp->clone_mt == MT_FILTER &&
132 dcp->ifmatch(ifr.ifr_name) != 0)
133 break;
134 }
135
136 if (dcp == NULL) {
137 /* Try to find a default callback by prefix */
138 SLIST_FOREACH(dcp, &clone_defcbh, next) {
139 if (dcp->clone_mt == MT_PREFIX &&
140 strncmp(dcp->ifprefix, ifr.ifr_name,
141 strlen(dcp->ifprefix)) == 0)
142 break;
143 }
144 }
145
146 if (dcp == NULL || dcp->clone_cb == NULL) {
147 /* NB: no parameters */
148 ioctl_ifcreate(s, &ifr);
149 } else {
150 dcp->clone_cb(s, &ifr);
151 }
152
153 /*
154 * If we get a different name back than we put in, update record and
155 * indicate it should be printed later.
156 */
157 if (strncmp(name, ifr.ifr_name, sizeof(name)) != 0) {
158 strlcpy(name, ifr.ifr_name, sizeof(name));
159 printifname = 1;
160 }
161 }
162
163 static
DECL_CMD_FUNC(clone_create,arg,d)164 DECL_CMD_FUNC(clone_create, arg, d)
165 {
166 callback_register(ifclonecreate, NULL);
167 }
168
169 static
DECL_CMD_FUNC(clone_destroy,arg,d)170 DECL_CMD_FUNC(clone_destroy, arg, d)
171 {
172 (void) strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
173 if (ioctl(s, SIOCIFDESTROY, &ifr) < 0)
174 err(1, "SIOCIFDESTROY");
175 }
176
177 static struct cmd clone_cmds[] = {
178 DEF_CLONE_CMD("create", 0, clone_create),
179 DEF_CMD("destroy", 0, clone_destroy),
180 DEF_CLONE_CMD("plumb", 0, clone_create),
181 DEF_CMD("unplumb", 0, clone_destroy),
182 };
183
184 static void
clone_Copt_cb(const char * optarg __unused)185 clone_Copt_cb(const char *optarg __unused)
186 {
187 list_cloners();
188 exit(exit_code);
189 }
190 static struct option clone_Copt = { .opt = "C", .opt_usage = "[-C]", .cb = clone_Copt_cb };
191
192 static __constructor void
clone_ctor(void)193 clone_ctor(void)
194 {
195 size_t i;
196
197 for (i = 0; i < nitems(clone_cmds); i++)
198 cmd_register(&clone_cmds[i]);
199 opt_register(&clone_Copt);
200 }
201