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 * 3. 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: head/sbin/ifconfig/ifclone.c 194799 2009-06-23 23:49:52Z delphij $ 30 */ 31 32 #include <sys/queue.h> 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 struct clone_defcb { 90 char ifprefix[IFNAMSIZ]; 91 clone_callback_func *clone_cb; 92 SLIST_ENTRY(clone_defcb) next; 93 }; 94 95 static SLIST_HEAD(, clone_defcb) clone_defcbh = 96 SLIST_HEAD_INITIALIZER(clone_defcbh); 97 98 void 99 clone_setdefcallback(const char *ifprefix, clone_callback_func *p) 100 { 101 struct clone_defcb *dcp; 102 103 dcp = malloc(sizeof(*dcp)); 104 strlcpy(dcp->ifprefix, ifprefix, IFNAMSIZ-1); 105 dcp->clone_cb = p; 106 SLIST_INSERT_HEAD(&clone_defcbh, dcp, next); 107 } 108 109 /* 110 * Do the actual clone operation. Any parameters must have been 111 * setup by now. If a callback has been setup to do the work 112 * then defer to it; otherwise do a simple create operation with 113 * no parameters. 114 */ 115 static void 116 ifclonecreate(int s, void *arg) 117 { 118 struct ifreq ifr; 119 struct clone_defcb *dcp; 120 clone_callback_func *clone_cb = NULL; 121 122 memset(&ifr, 0, sizeof(ifr)); 123 (void) strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name)); 124 125 if (clone_cb == NULL) { 126 /* Try to find a default callback */ 127 SLIST_FOREACH(dcp, &clone_defcbh, next) { 128 if (strncmp(dcp->ifprefix, ifr.ifr_name, 129 strlen(dcp->ifprefix)) == 0) { 130 clone_cb = dcp->clone_cb; 131 break; 132 } 133 } 134 } 135 if (clone_cb == NULL) { 136 /* NB: no parameters */ 137 if (ioctl(s, SIOCIFCREATE2, &ifr) < 0) 138 err(1, "SIOCIFCREATE2"); 139 } else { 140 clone_cb(s, &ifr); 141 } 142 143 /* 144 * If we get a different name back than we put in, print it. 145 */ 146 if (strncmp(name, ifr.ifr_name, sizeof(name)) != 0) { 147 strlcpy(name, ifr.ifr_name, sizeof(name)); 148 printf("%s\n", name); 149 } 150 } 151 152 static 153 DECL_CMD_FUNC(clone_create, arg, d) 154 { 155 callback_register(ifclonecreate, NULL); 156 } 157 158 static 159 DECL_CMD_FUNC(clone_destroy, arg, d) 160 { 161 (void) strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name)); 162 if (ioctl(s, SIOCIFDESTROY, &ifr) < 0) 163 err(1, "SIOCIFDESTROY"); 164 } 165 166 static struct cmd clone_cmds[] = { 167 DEF_CLONE_CMD("create", 0, clone_create), 168 DEF_CMD("destroy", 0, clone_destroy), 169 DEF_CLONE_CMD("plumb", 0, clone_create), 170 DEF_CMD("unplumb", 0, clone_destroy), 171 }; 172 173 static void 174 clone_Copt_cb(const char *optarg __unused) 175 { 176 list_cloners(); 177 exit(0); 178 } 179 static struct option clone_Copt = { .opt = "C", .opt_usage = "[-C]", .cb = clone_Copt_cb }; 180 181 static __constructor(101) void 182 clone_ctor(void) 183 { 184 #define N(a) (sizeof(a) / sizeof(a[0])) 185 size_t i; 186 187 for (i = 0; i < N(clone_cmds); i++) 188 cmd_register(&clone_cmds[i]); 189 opt_register(&clone_Copt); 190 #undef N 191 } 192