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