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
  30 #ifndef lint
  31 static const char rcsid[] =
  32   "$FreeBSD$";
  33 #endif /* not lint */
  34
  35 #include <sys/types.h>
  36 #include <sys/ioctl.h>
  37 #include <sys/socket.h>
  38 #include <net/if.h>
  39
  40 #include <err.h>
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 #include <unistd.h>
  45
  46 #include "ifconfig.h"
  47
  48 static void
  49 list_cloners(void)
  50 {
  51         struct if_clonereq ifcr;
  52         char *cp, *buf;
  53         int idx;
  54         int s;
  55
  56         s = socket(AF_INET, SOCK_DGRAM, 0);
  57         if (s == -1)
  58                 err(1, "socket(AF_INET,SOCK_DGRAM)");
  59
  60         memset(&ifcr, 0, sizeof(ifcr));
  61
  62         if (ioctl(s, SIOCIFGCLONERS, &ifcr) < 0)
  63                 err(1, "SIOCIFGCLONERS for count");
  64
  65         buf = malloc(ifcr.ifcr_total * IFNAMSIZ);
  66         if (buf == NULL)
  67                 err(1, "unable to allocate cloner name buffer");
  68
  69         ifcr.ifcr_count = ifcr.ifcr_total;
  70         ifcr.ifcr_buffer = buf;
  71
  72         if (ioctl(s, SIOCIFGCLONERS, &ifcr) < 0)
  73                 err(1, "SIOCIFGCLONERS for names");
  74
  75         /*
  76          * In case some disappeared in the mean time, clamp it down.
  77          */
  78         if (ifcr.ifcr_count > ifcr.ifcr_total)
  79                 ifcr.ifcr_count = ifcr.ifcr_total;
  80
  81         for (cp = buf, idx = 0; idx < ifcr.ifcr_count; idx++, cp += IFNAMSIZ) {
  82                 if (idx > 0)
  83                         putchar(' ');
  84                 printf("%s", cp);
  85         }
  86
  87         putchar('\n');
  88         free(buf);
  89 }
  90
  91 static clone_callback_func *clone_cb = NULL;
  92
  93 void
  94 clone_setcallback(clone_callback_func *p)
  95 {
  96         if (clone_cb != NULL && clone_cb != p)
  97                 errx(1, "conflicting device create parameters");
  98         clone_cb = p;
  99 }
 100
 101 /*
 102  * Do the actual clone operation.  Any parameters must have been
 103  * setup by now.  If a callback has been setup to do the work
 104  * then defer to it; otherwise do a simple create operation with
 105  * no parameters.
 106  */
 107 static void
 108 ifclonecreate(int s, void *arg)
 109 {
 110         struct ifreq ifr;
 111
 112         memset(&ifr, 0, sizeof(ifr));
 113         (void) strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
 114         if (clone_cb == NULL) {
 115                 /* NB: no parameters */
 116                 if (ioctl(s, SIOCIFCREATE2, &ifr) < 0)
 117                         err(1, "SIOCIFCREATE2");
 118         } else {
 119                 clone_cb(s, &ifr);
 120         }
 121
 122         /*
 123          * If we get a different name back than we put in, print it.
 124          */
 125         if (strncmp(name, ifr.ifr_name, sizeof(name)) != 0) {
 126                 strlcpy(name, ifr.ifr_name, sizeof(name));
 127                 printf("%s\n", name);
 128         }
 129 }
 130
 131 static
 132 DECL_CMD_FUNC(clone_create, arg, d)
 133 {
 134         callback_register(ifclonecreate, NULL);
 135 }
 136
 137 static
 138 DECL_CMD_FUNC(clone_destroy, arg, d)
 139 {
 140         (void) strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
 141         if (ioctl(s, SIOCIFDESTROY, &ifr) < 0)
 142                 err(1, "SIOCIFDESTROY");
 143 }
 144
 145 static struct cmd clone_cmds[] = {
 146         DEF_CLONE_CMD("create", 0,      clone_create),
 147         DEF_CMD("destroy",      0,      clone_destroy),
 148         DEF_CLONE_CMD("plumb",  0,      clone_create),
 149         DEF_CMD("unplumb",      0,      clone_destroy),
 150 };
 151
 152 static void
 153 clone_Copt_cb(const char *optarg __unused)
 154 {
 155         list_cloners();
 156         exit(0);
 157 }
 158 static struct option clone_Copt = { "C", "[-C]", clone_Copt_cb };
 159
 160 static __constructor void
 161 clone_ctor(void)
 162 {
 163 #define N(a)    (sizeof(a) / sizeof(a[0]))
 164         int i;
 165
 166         for (i = 0; i < N(clone_cmds);  i++)
 167                 cmd_register(&clone_cmds[i]);
 168         opt_register(&clone_Copt);
 169 #undef N
 170 }