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 * $FreeBSD: head/sbin/ifconfig/ifclone.c 326025 2017-11-20 19:49:47Z pfg $ 32 */ 33 34 #include <sys/param.h> 35 #include <sys/queue.h> 36 #include <sys/ioctl.h> 37 #include <sys/socket.h> 38 #include <net/if.h> 39 #include <net/if_clone.h> 40 41 #include <err.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <unistd.h> 46 47 #include "ifconfig.h" 48 49 static void 50 list_cloners(void) 51 { 52 struct if_clonereq ifcr; 53 char *cp, *buf; 54 int idx; 55 int s; 56 57 s = socket(AF_LOCAL, SOCK_DGRAM, 0); 58 if (s == -1) 59 err(1, "socket(AF_LOCAL,SOCK_DGRAM)"); 60 61 memset(&ifcr, 0, sizeof(ifcr)); 62 63 if (ioctl(s, SIOCIFGCLONERS, &ifcr) < 0) 64 err(1, "SIOCIFGCLONERS for count"); 65 66 buf = malloc(ifcr.ifcr_total * IFNAMSIZ); 67 if (buf == NULL) 68 err(1, "unable to allocate cloner name buffer"); 69 70 ifcr.ifcr_count = ifcr.ifcr_total; 71 ifcr.ifcr_buffer = buf; 72 73 if (ioctl(s, SIOCIFGCLONERS, &ifcr) < 0) 74 err(1, "SIOCIFGCLONERS for names"); 75 76 /* 77 * In case some disappeared in the mean time, clamp it down. 78 */ 79 if (ifcr.ifcr_count > ifcr.ifcr_total) 80 ifcr.ifcr_count = ifcr.ifcr_total; 81 82 for (cp = buf, idx = 0; idx < ifcr.ifcr_count; idx++, cp += IFNAMSIZ) { 83 if (idx > 0) 84 putchar(' '); 85 printf("%s", cp); 86 } 87 88 putchar('\n'); 89 free(buf); 90 close(s); 91 } 92 93 struct clone_defcb { 94 char ifprefix[IFNAMSIZ]; 95 clone_callback_func *clone_cb; 96 SLIST_ENTRY(clone_defcb) next; 97 }; 98 99 static SLIST_HEAD(, clone_defcb) clone_defcbh = 100 SLIST_HEAD_INITIALIZER(clone_defcbh); 101 102 void 103 clone_setdefcallback(const char *ifprefix, clone_callback_func *p) 104 { 105 struct clone_defcb *dcp; 106 107 dcp = malloc(sizeof(*dcp)); 108 strlcpy(dcp->ifprefix, ifprefix, IFNAMSIZ-1); 109 dcp->clone_cb = p; 110 SLIST_INSERT_HEAD(&clone_defcbh, dcp, next); 111 } 112 113 /* 114 * Do the actual clone operation. Any parameters must have been 115 * setup by now. If a callback has been setup to do the work 116 * then defer to it; otherwise do a simple create operation with 117 * no parameters. 118 */ 119 static void 120 ifclonecreate(int s, __unused void *arg) 121 { 122 struct ifreq ifr; 123 struct clone_defcb *dcp; 124 clone_callback_func *clone_cb = NULL; 125 126 memset(&ifr, 0, sizeof(ifr)); 127 strlcpy(ifr.ifr_name, IfName, sizeof(ifr.ifr_name)); 128 129 if (clone_cb == NULL) { 130 /* Try to find a default callback */ 131 SLIST_FOREACH(dcp, &clone_defcbh, next) { 132 if (strncmp(dcp->ifprefix, ifr.ifr_name, 133 strlen(dcp->ifprefix)) == 0) { 134 clone_cb = dcp->clone_cb; 135 break; 136 } 137 } 138 } 139 if (clone_cb == NULL) { 140 /* NB: no parameters */ 141 if (ioctl(s, SIOCIFCREATE2, &ifr) < 0) 142 err(1, "SIOCIFCREATE2"); 143 } else { 144 clone_cb(s, &ifr); 145 } 146 147 /* 148 * If we get a different name back than we put in, update record and 149 * indicate it should be printed later. 150 */ 151 if (strncmp(IfName, ifr.ifr_name, sizeof(IfName)) != 0) { 152 strlcpy(IfName, ifr.ifr_name, sizeof(IfName)); 153 printifname = 1; 154 } 155 } 156 157 static void 158 clone_create(const char *x __unused, int arg __unused, int s __unused, 159 const struct afswtch *afp __unused) 160 { 161 callback_register(ifclonecreate, NULL); 162 } 163 164 static void 165 clone_destroy(const char *x __unused, int arg __unused, int s __unused, 166 const struct afswtch *afp __unused) 167 { 168 struct ifreq ifr; 169 170 memset(&ifr, 0, sizeof(ifr)); 171 strlcpy(ifr.ifr_name, IfName, sizeof(ifr.ifr_name)); 172 173 if (ioctl(s, SIOCIFDESTROY, &ifr) < 0) 174 err(1, "SIOCIFDESTROY"); 175 } 176 177 static struct cmd clone_cmds[] = { 178 DEF_CLONE_CMD("create", 0, clone_create), 179 DEF_CMD("destroy", 0, clone_destroy), 180 DEF_CLONE_CMD("plumb", 0, clone_create), 181 DEF_CMD("unplumb", 0, clone_destroy), 182 }; 183 184 static void 185 clone_Copt_cb(const char *arg __unused) 186 { 187 list_cloners(); 188 exit(exit_code); 189 } 190 191 static struct option clone_Copt = { 192 .opt = "C", 193 .opt_usage = "[-C]", 194 .cb = clone_Copt_cb, 195 }; 196 197 __constructor(121) 198 static void 199 clone_ctor(void) 200 { 201 size_t i; 202 203 for (i = 0; i < nitems(clone_cmds); i++) 204 cmd_register(&clone_cmds[i]); 205 206 opt_register(&clone_Copt); 207 } 208