sbin/ifconfig/ifclone.c

   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  * $FreeBSD: src/sbin/ifconfig/ifclone.c,v 1.1 2004/12/08 19:18:07 sam Exp $
  30  * $DragonFly: src/sbin/ifconfig/ifclone.c,v 1.1 2006/04/02 03:33:59 sephe Exp $
  31  */
  32
  33 #include <sys/types.h>
  34 #include <sys/ioctl.h>
  35 #include <sys/socket.h>
  36 #include <net/if.h>
  37
  38 #include <err.h>
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42 #include <unistd.h>
  43
  44 #include "ifconfig.h"
  45
  46 static void
  47 list_cloners(void)
  48 {
  49         struct if_clonereq ifcr;
  50         char *cp, *buf;
  51         int idx;
  52         int s;
  53
  54         s = socket(AF_INET, SOCK_DGRAM, 0);
  55         if (s == -1)
  56                 err(1, "socket(AF_INET,SOCK_DGRAM)");
  57
  58         memset(&ifcr, 0, sizeof(ifcr));
  59
  60         if (ioctl(s, SIOCIFGCLONERS, &ifcr) < 0)
  61                 err(1, "SIOCIFGCLONERS for count");
  62
  63         buf = malloc(ifcr.ifcr_total * IFNAMSIZ);
  64         if (buf == NULL)
  65                 err(1, "unable to allocate cloner name buffer");
  66
  67         ifcr.ifcr_count = ifcr.ifcr_total;
  68         ifcr.ifcr_buffer = buf;
  69
  70         if (ioctl(s, SIOCIFGCLONERS, &ifcr) < 0)
  71                 err(1, "SIOCIFGCLONERS for names");
  72
  73         /*
  74          * In case some disappeared in the mean time, clamp it down.
  75          */
  76         if (ifcr.ifcr_count > ifcr.ifcr_total)
  77                 ifcr.ifcr_count = ifcr.ifcr_total;
  78
  79         for (cp = buf, idx = 0; idx < ifcr.ifcr_count; idx++, cp += IFNAMSIZ) {
  80                 if (idx > 0)
  81                         putchar(' ');
  82                 printf("%s", cp);
  83         }
  84
  85         putchar('\n');
  86         free(buf);
  87 }
  88
  89 void
  90 clone_create(void)
  91 {
  92         int s;
  93
  94         s = socket(AF_INET, SOCK_DGRAM, 0);
  95         if (s == -1)
  96                 err(1, "socket(AF_INET,SOCK_DGRAM)");
  97
  98         memset(&ifr, 0, sizeof(ifr));
  99         (void) strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
 100         if (ioctl(s, SIOCIFCREATE, &ifr) < 0)
 101                 err(1, "SIOCIFCREATE");
 102
 103         /*
 104          * If we get a different name back then we put in, we probably
 105          * want to print it out, but we might change our mind later so
 106          * we just signal our interest and leave the printout for later.
 107          */
 108         if (strcmp(name, ifr.ifr_name) != 0) {
 109                 printname = 1;
 110                 strlcpy(name, ifr.ifr_name, sizeof(name));
 111         }
 112
 113         close(s);
 114 }
 115
 116 static void
 117 clone_destroy(const char *val, int d, int s, const struct afswtch *rafp)
 118 {
 119
 120         (void) strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
 121         if (ioctl(s, SIOCIFDESTROY, &ifr) < 0)
 122                 err(1, "SIOCIFDESTROY");
 123         /*
 124          * If we create and destroy an interface in the same command,
 125          * there isn't any reason to print it's name.
 126          */
 127         printname = 0;
 128 }
 129
 130 static struct cmd clone_cmds[] = {
 131         DEF_CMD("destroy",      0,      clone_destroy),
 132         DEF_CMD("unplumb",      0,      clone_destroy),
 133 };
 134
 135 static void
 136 clone_Copt_cb(const char *optarg __unused)
 137 {
 138         list_cloners();
 139         exit(0);
 140 }
 141 static struct option clone_Copt = { "C", "[-C]", clone_Copt_cb };
 142
 143 static __constructor void
 144 clone_ctor(void)
 145 {
 146 #define N(a)    (sizeof(a) / sizeof(a[0]))
 147         int i;
 148
 149         for (i = 0; i < N(clone_cmds);  i++)
 150                 cmd_register(&clone_cmds[i]);
 151         opt_register(&clone_Copt);
 152 #undef N
 153 }