1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1983, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #ifndef lint 33 static const char rcsid[] = 34 "$FreeBSD$"; 35 #endif /* not lint */ 36 37 #include <sys/param.h> 38 #include <sys/ioctl.h> 39 #include <sys/queue.h> 40 #include <sys/socket.h> 41 #include <net/if.h> 42 43 #include <err.h> 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <string.h> 47 #include <unistd.h> 48 49 #include "ifconfig.h" 50 51 static void 52 list_cloners(void) 53 { 54 struct if_clonereq ifcr; 55 char *cp, *buf; 56 int idx; 57 int s; 58 59 s = socket(AF_LOCAL, SOCK_DGRAM, 0); 60 if (s == -1) 61 err(1, "socket(AF_LOCAL,SOCK_DGRAM)"); 62 63 memset(&ifcr, 0, sizeof(ifcr)); 64 65 if (ioctl(s, SIOCIFGCLONERS, &ifcr) < 0) 66 err(1, "SIOCIFGCLONERS for count"); 67 68 buf = malloc(ifcr.ifcr_total * IFNAMSIZ); 69 if (buf == NULL) 70 err(1, "unable to allocate cloner name buffer"); 71 72 ifcr.ifcr_count = ifcr.ifcr_total; 73 ifcr.ifcr_buffer = buf; 74 75 if (ioctl(s, SIOCIFGCLONERS, &ifcr) < 0) 76 err(1, "SIOCIFGCLONERS for names"); 77 78 /* 79 * In case some disappeared in the mean time, clamp it down. 80 */ 81 if (ifcr.ifcr_count > ifcr.ifcr_total) 82 ifcr.ifcr_count = ifcr.ifcr_total; 83 84 for (cp = buf, idx = 0; idx < ifcr.ifcr_count; idx++, cp += IFNAMSIZ) { 85 if (idx > 0) 86 putchar(' '); 87 printf("%s", cp); 88 } 89 90 putchar('\n'); 91 free(buf); 92 close(s); 93 } 94 95 struct clone_defcb { 96 char ifprefix[IFNAMSIZ]; 97 clone_callback_func *clone_cb; 98 SLIST_ENTRY(clone_defcb) next; 99 }; 100 101 static SLIST_HEAD(, clone_defcb) clone_defcbh = 102 SLIST_HEAD_INITIALIZER(clone_defcbh); 103 104 void 105 clone_setdefcallback(const char *ifprefix, clone_callback_func *p) 106 { 107 struct clone_defcb *dcp; 108 109 dcp = malloc(sizeof(*dcp)); 110 strlcpy(dcp->ifprefix, ifprefix, IFNAMSIZ-1); 111 dcp->clone_cb = p; 112 SLIST_INSERT_HEAD(&clone_defcbh, dcp, next); 113 } 114 115 /* 116 * Do the actual clone operation. Any parameters must have been 117 * setup by now. If a callback has been setup to do the work 118 * then defer to it; otherwise do a simple create operation with 119 * no parameters. 120 */ 121 static void 122 ifclonecreate(int s, void *arg) 123 { 124 struct ifreq ifr; 125 struct clone_defcb *dcp; 126 clone_callback_func *clone_cb = NULL; 127 128 memset(&ifr, 0, sizeof(ifr)); 129 (void) strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name)); 130 131 if (clone_cb == NULL) { 132 /* Try to find a default callback */ 133 SLIST_FOREACH(dcp, &clone_defcbh, next) { 134 if (strncmp(dcp->ifprefix, ifr.ifr_name, 135 strlen(dcp->ifprefix)) == 0) { 136 clone_cb = dcp->clone_cb; 137 break; 138 } 139 } 140 } 141 if (clone_cb == NULL) { 142 /* NB: no parameters */ 143 if (ioctl(s, SIOCIFCREATE2, &ifr) < 0) 144 err(1, "SIOCIFCREATE2"); 145 } else { 146 clone_cb(s, &ifr); 147 } 148 149 /* 150 * If we get a different name back than we put in, update record and 151 * indicate it should be printed later. 152 */ 153 if (strncmp(name, ifr.ifr_name, sizeof(name)) != 0) { 154 strlcpy(name, ifr.ifr_name, sizeof(name)); 155 printifname = 1; 156 } 157 } 158 159 static 160 DECL_CMD_FUNC(clone_create, arg, d) 161 { 162 callback_register(ifclonecreate, NULL); 163 } 164 165 static 166 DECL_CMD_FUNC(clone_destroy, arg, d) 167 { 168 (void) strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name)); 169 if (ioctl(s, SIOCIFDESTROY, &ifr) < 0) 170 err(1, "SIOCIFDESTROY"); 171 } 172 173 static struct cmd clone_cmds[] = { 174 DEF_CLONE_CMD("create", 0, clone_create), 175 DEF_CMD("destroy", 0, clone_destroy), 176 DEF_CLONE_CMD("plumb", 0, clone_create), 177 DEF_CMD("unplumb", 0, clone_destroy), 178 }; 179 180 static void 181 clone_Copt_cb(const char *optarg __unused) 182 { 183 list_cloners(); 184 exit(0); 185 } 186 static struct option clone_Copt = { .opt = "C", .opt_usage = "[-C]", .cb = clone_Copt_cb }; 187 188 static __constructor void 189 clone_ctor(void) 190 { 191 size_t i; 192 193 for (i = 0; i < nitems(clone_cmds); i++) 194 cmd_register(&clone_cmds[i]); 195 opt_register(&clone_Copt); 196 } 197