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#include <sys/types.h> 31#include <sys/ioctl.h> 32#include <sys/socket.h> 33#include <net/if.h> 34 35#include <err.h> 36#include <stdio.h> 37#include <stdlib.h> 38#include <string.h> 39#include <unistd.h> 40 41#include "ifconfig.h" 42 43static void 44list_cloners(void) 45{ 46 struct if_clonereq ifcr; 47 char *cp, *buf; 48 int idx; 49 int s; 50 51 s = socket(AF_INET, SOCK_DGRAM, 0); 52 if (s == -1) 53 err(1, "socket(AF_INET,SOCK_DGRAM)"); 54 55 memset(&ifcr, 0, sizeof(ifcr)); 56 57 if (ioctl(s, SIOCIFGCLONERS, &ifcr) < 0) 58 err(1, "SIOCIFGCLONERS for count"); 59 60 buf = malloc(ifcr.ifcr_total * IFNAMSIZ); 61 if (buf == NULL) 62 err(1, "unable to allocate cloner name buffer"); 63 64 ifcr.ifcr_count = ifcr.ifcr_total; 65 ifcr.ifcr_buffer = buf; 66 67 if (ioctl(s, SIOCIFGCLONERS, &ifcr) < 0) 68 err(1, "SIOCIFGCLONERS for names"); 69 70 /* 71 * In case some disappeared in the mean time, clamp it down. 72 */ 73 if (ifcr.ifcr_count > ifcr.ifcr_total) 74 ifcr.ifcr_count = ifcr.ifcr_total; 75 76 for (cp = buf, idx = 0; idx < ifcr.ifcr_count; idx++, cp += IFNAMSIZ) { 77 if (idx > 0) 78 putchar(' '); 79 printf("%s", cp); 80 } 81 82 putchar('\n'); 83 free(buf); 84} 85 86static clone_callback_func *clone_cb = NULL; 87 88void 89clone_setcallback(clone_callback_func *p) 90{ 91 if (clone_cb != NULL && clone_cb != p) 92 errx(1, "conflicting device create parameters"); 93 clone_cb = p; 94} 95 96/* 97 * Do the actual clone operation. Any parameters must have been 98 * setup by now. If a callback has been setup to do the work 99 * then defer to it; otherwise do a simple create operation with 100 * no parameters. 101 */ 102static void 103ifclonecreate(int s, void *arg) 104{ 105 struct ifreq ifr; 106 107 memset(&ifr, 0, sizeof(ifr)); 108 (void) strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name)); 109 if (clone_cb == NULL) { 110#ifdef SIOCIFCREATE2 111 /* NB: no parameters */ 112 if (ioctl(s, SIOCIFCREATE2, &ifr) < 0) 113 err(1, "SIOCIFCREATE2"); 114#else 115 if (ioctl(s, SIOCIFCREATE, &ifr) < 0) 116 err(1, "SIOCIFCREATE"); 117#endif 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_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 152static void 153clone_Copt_cb(const char *optarg __unused) 154{ 155 list_cloners(); 156 exit(0); 157} 158static struct option clone_Copt = { "C", "[-C]", clone_Copt_cb }; 159 160static __constructor void 161clone_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} 171