freebsd-dev/sbin/ifconfig/ifclone.c
Warner Losh fbbd9655e5 Renumber copyright clause 4
Renumber cluase 4 to 3, per what everybody else did when BSD granted
them permission to remove clause 3. My insistance on keeping the same
numbering for legal reasons is too pedantic, so give up on that point.

Submitted by:	Jan Schaumann <jschauma@stevens.edu>
Pull Request:	https://github.com/freebsd/freebsd/pull/96
2017-02-28 23:42:47 +00:00

194 lines
5.0 KiB
C

/*
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static const char rcsid[] =
"$FreeBSD$";
#endif /* not lint */
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <net/if.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "ifconfig.h"
static void
list_cloners(void)
{
struct if_clonereq ifcr;
char *cp, *buf;
int idx;
int s;
s = socket(AF_LOCAL, SOCK_DGRAM, 0);
if (s == -1)
err(1, "socket(AF_LOCAL,SOCK_DGRAM)");
memset(&ifcr, 0, sizeof(ifcr));
if (ioctl(s, SIOCIFGCLONERS, &ifcr) < 0)
err(1, "SIOCIFGCLONERS for count");
buf = malloc(ifcr.ifcr_total * IFNAMSIZ);
if (buf == NULL)
err(1, "unable to allocate cloner name buffer");
ifcr.ifcr_count = ifcr.ifcr_total;
ifcr.ifcr_buffer = buf;
if (ioctl(s, SIOCIFGCLONERS, &ifcr) < 0)
err(1, "SIOCIFGCLONERS for names");
/*
* In case some disappeared in the mean time, clamp it down.
*/
if (ifcr.ifcr_count > ifcr.ifcr_total)
ifcr.ifcr_count = ifcr.ifcr_total;
for (cp = buf, idx = 0; idx < ifcr.ifcr_count; idx++, cp += IFNAMSIZ) {
if (idx > 0)
putchar(' ');
printf("%s", cp);
}
putchar('\n');
free(buf);
}
struct clone_defcb {
char ifprefix[IFNAMSIZ];
clone_callback_func *clone_cb;
SLIST_ENTRY(clone_defcb) next;
};
static SLIST_HEAD(, clone_defcb) clone_defcbh =
SLIST_HEAD_INITIALIZER(clone_defcbh);
void
clone_setdefcallback(const char *ifprefix, clone_callback_func *p)
{
struct clone_defcb *dcp;
dcp = malloc(sizeof(*dcp));
strlcpy(dcp->ifprefix, ifprefix, IFNAMSIZ-1);
dcp->clone_cb = p;
SLIST_INSERT_HEAD(&clone_defcbh, dcp, next);
}
/*
* Do the actual clone operation. Any parameters must have been
* setup by now. If a callback has been setup to do the work
* then defer to it; otherwise do a simple create operation with
* no parameters.
*/
static void
ifclonecreate(int s, void *arg)
{
struct ifreq ifr;
struct clone_defcb *dcp;
clone_callback_func *clone_cb = NULL;
memset(&ifr, 0, sizeof(ifr));
(void) strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
if (clone_cb == NULL) {
/* Try to find a default callback */
SLIST_FOREACH(dcp, &clone_defcbh, next) {
if (strncmp(dcp->ifprefix, ifr.ifr_name,
strlen(dcp->ifprefix)) == 0) {
clone_cb = dcp->clone_cb;
break;
}
}
}
if (clone_cb == NULL) {
/* NB: no parameters */
if (ioctl(s, SIOCIFCREATE2, &ifr) < 0)
err(1, "SIOCIFCREATE2");
} else {
clone_cb(s, &ifr);
}
/*
* If we get a different name back than we put in, update record and
* indicate it should be printed later.
*/
if (strncmp(name, ifr.ifr_name, sizeof(name)) != 0) {
strlcpy(name, ifr.ifr_name, sizeof(name));
printifname = 1;
}
}
static
DECL_CMD_FUNC(clone_create, arg, d)
{
callback_register(ifclonecreate, NULL);
}
static
DECL_CMD_FUNC(clone_destroy, arg, d)
{
(void) strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
if (ioctl(s, SIOCIFDESTROY, &ifr) < 0)
err(1, "SIOCIFDESTROY");
}
static struct cmd clone_cmds[] = {
DEF_CLONE_CMD("create", 0, clone_create),
DEF_CMD("destroy", 0, clone_destroy),
DEF_CLONE_CMD("plumb", 0, clone_create),
DEF_CMD("unplumb", 0, clone_destroy),
};
static void
clone_Copt_cb(const char *optarg __unused)
{
list_cloners();
exit(0);
}
static struct option clone_Copt = { .opt = "C", .opt_usage = "[-C]", .cb = clone_Copt_cb };
static __constructor void
clone_ctor(void)
{
size_t i;
for (i = 0; i < nitems(clone_cmds); i++)
cmd_register(&clone_cmds[i]);
opt_register(&clone_Copt);
}