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_CMD("create", 0, clone_create), 147 DEF_CMD("destroy", 0, clone_destroy), 148 DEF_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 } 171