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 <libifconfig.h> 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <string.h> 48 #include <unistd.h> 49 50 #include "ifconfig.h" 51 52 typedef enum { 53 MT_PREFIX, 54 MT_FILTER, 55 } clone_match_type; 56 57 static void 58 list_cloners(void) 59 { 60 ifconfig_handle_t *lifh; 61 char *cloners; 62 size_t cloners_count; 63 64 lifh = ifconfig_open(); 65 if (lifh == NULL) 66 return; 67 68 if (ifconfig_list_cloners(lifh, &cloners, &cloners_count) < 0) 69 errc(1, ifconfig_err_errno(lifh), "unable to list cloners"); 70 ifconfig_close(lifh); 71 72 for (const char *name = cloners; 73 name < cloners + cloners_count * IFNAMSIZ; 74 name += IFNAMSIZ) { 75 if (name > cloners) 76 putchar(' '); 77 printf("%s", name); 78 } 79 putchar('\n'); 80 free(cloners); 81 } 82 83 struct clone_defcb { 84 union { 85 char ifprefix[IFNAMSIZ]; 86 clone_match_func *ifmatch; 87 }; 88 clone_match_type clone_mt; 89 clone_callback_func *clone_cb; 90 SLIST_ENTRY(clone_defcb) next; 91 }; 92 93 static SLIST_HEAD(, clone_defcb) clone_defcbh = 94 SLIST_HEAD_INITIALIZER(clone_defcbh); 95 96 void 97 clone_setdefcallback_prefix(const char *ifprefix, clone_callback_func *p) 98 { 99 struct clone_defcb *dcp; 100 101 dcp = malloc(sizeof(*dcp)); 102 strlcpy(dcp->ifprefix, ifprefix, IFNAMSIZ-1); 103 dcp->clone_mt = MT_PREFIX; 104 dcp->clone_cb = p; 105 SLIST_INSERT_HEAD(&clone_defcbh, dcp, next); 106 } 107 108 void 109 clone_setdefcallback_filter(clone_match_func *filter, clone_callback_func *p) 110 { 111 struct clone_defcb *dcp; 112 113 dcp = malloc(sizeof(*dcp)); 114 dcp->ifmatch = filter; 115 dcp->clone_mt = MT_FILTER; 116 dcp->clone_cb = p; 117 SLIST_INSERT_HEAD(&clone_defcbh, dcp, next); 118 } 119 120 /* 121 * Do the actual clone operation. Any parameters must have been 122 * setup by now. If a callback has been setup to do the work 123 * then defer to it; otherwise do a simple create operation with 124 * no parameters. 125 */ 126 static void 127 ifclonecreate(int s, void *arg) 128 { 129 struct ifreq ifr; 130 struct clone_defcb *dcp; 131 clone_callback_func *clone_cb = NULL; 132 133 memset(&ifr, 0, sizeof(ifr)); 134 (void) strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name)); 135 136 if (clone_cb == NULL) { 137 /* Try to find a default callback */ 138 SLIST_FOREACH(dcp, &clone_defcbh, next) { 139 if ((dcp->clone_mt == MT_PREFIX) && 140 (strncmp(dcp->ifprefix, ifr.ifr_name, 141 strlen(dcp->ifprefix)) == 0)) { 142 clone_cb = dcp->clone_cb; 143 break; 144 } 145 if ((dcp->clone_mt == MT_FILTER) && 146 dcp->ifmatch(ifr.ifr_name)) { 147 clone_cb = dcp->clone_cb; 148 break; 149 } 150 } 151 } 152 if (clone_cb == NULL) { 153 /* NB: no parameters */ 154 if (ioctl(s, SIOCIFCREATE2, &ifr) < 0) 155 err(1, "SIOCIFCREATE2"); 156 } else { 157 clone_cb(s, &ifr); 158 } 159 160 /* 161 * If we get a different name back than we put in, update record and 162 * indicate it should be printed later. 163 */ 164 if (strncmp(name, ifr.ifr_name, sizeof(name)) != 0) { 165 strlcpy(name, ifr.ifr_name, sizeof(name)); 166 printifname = 1; 167 } 168 } 169 170 static 171 DECL_CMD_FUNC(clone_create, arg, d) 172 { 173 callback_register(ifclonecreate, NULL); 174 } 175 176 static 177 DECL_CMD_FUNC(clone_destroy, arg, d) 178 { 179 (void) strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name)); 180 if (ioctl(s, SIOCIFDESTROY, &ifr) < 0) 181 err(1, "SIOCIFDESTROY"); 182 } 183 184 static struct cmd clone_cmds[] = { 185 DEF_CLONE_CMD("create", 0, clone_create), 186 DEF_CMD("destroy", 0, clone_destroy), 187 DEF_CLONE_CMD("plumb", 0, clone_create), 188 DEF_CMD("unplumb", 0, clone_destroy), 189 }; 190 191 static void 192 clone_Copt_cb(const char *optarg __unused) 193 { 194 list_cloners(); 195 exit(exit_code); 196 } 197 static struct option clone_Copt = { .opt = "C", .opt_usage = "[-C]", .cb = clone_Copt_cb }; 198 199 static __constructor void 200 clone_ctor(void) 201 { 202 size_t i; 203 204 for (i = 0; i < nitems(clone_cmds); i++) 205 cmd_register(&clone_cmds[i]); 206 opt_register(&clone_Copt); 207 } 208