text: /*
   * 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.
   * 4. 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: soc2013/dpl/head/sbin/ifconfig/ifclone.c 194842 2009-06-23 23:49:52Z delphij $";
  #endif /* not lint */
  
  #include <sys/queue.h>
  #include <sys/types.h>
  #include <sys/ioctl.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, print it.
  	 */
  	if (strncmp(name, ifr.ifr_name, sizeof(name)) != 0) {
  		strlcpy(name, ifr.ifr_name, sizeof(name));
  		printf("%s\n", name);
  	}
  }
  
  static
  DECL_CMD_FUNC(clone_create, arg, d)
  {
  	callback_register(ifclonecreate, NULL);
  }
  
  static
  DECL_CMD_FUNC(clone_destroy, arg, d)
  {
  	(void) strncpy(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)
  {
  #define	N(a)	(sizeof(a) / sizeof(a[0]))
  	size_t i;
  
  	for (i = 0; i < N(clone_cmds);  i++)
  		cmd_register(&clone_cmds[i]);
  	opt_register(&clone_Copt);
  #undef N
  }
  