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 } 154