ifclone.c revision 160196
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 31static const char rcsid[] = 32 "$FreeBSD: head/sbin/ifconfig/ifclone.c 160196 2006-07-09 06:10:23Z sam $"; 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 48static void 49list_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 91static clone_callback_func *clone_cb = NULL; 92 93void 94clone_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 */ 107static void 108ifclonecreate(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 131static 132DECL_CMD_FUNC(clone_create, arg, d) 133{ 134 callback_register(ifclonecreate, NULL); 135} 136 137static 138DECL_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 145static struct cmd clone_cmds[] = { 146 DEF_CMD("create", 0, clone_create), 147 DEF_CMD("destroy", 0, clone_destroy), 148 DEF_CMD("unplumb", 0, clone_destroy), 149}; 150 151static void 152clone_Copt_cb(const char *optarg __unused) 153{ 154 list_cloners(); 155 exit(0); 156} 157static struct option clone_Copt = { "C", "[-C]", clone_Copt_cb }; 158 159static __constructor void 160clone_ctor(void) 161{ 162#define N(a) (sizeof(a) / sizeof(a[0])) 163 int i; 164 165 for (i = 0; i < N(clone_cmds); i++) 166 cmd_register(&clone_cmds[i]); 167 opt_register(&clone_Copt); 168#undef N 169} 170