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 #include <sys/param.h> 33 #include <sys/ioctl.h> 34 #include <sys/queue.h> 35 #include <sys/socket.h> 36 #include <net/if.h> 37 38 #include <err.h> 39 #include <libifconfig.h> 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <string.h> 43 #include <unistd.h> 44 45 #include "ifconfig.h" 46 47 typedef enum { 48 MT_PREFIX, 49 MT_FILTER, 50 } clone_match_type; 51 52 static void 53 list_cloners(void) 54 { 55 char *cloners; 56 size_t cloners_count; 57 58 if (ifconfig_list_cloners(lifh, &cloners, &cloners_count) < 0) 59 errc(1, ifconfig_err_errno(lifh), "unable to list cloners"); 60 61 for (const char *name = cloners; 62 name < cloners + cloners_count * IFNAMSIZ; 63 name += IFNAMSIZ) { 64 if (name > cloners) 65 putchar(' '); 66 printf("%s", name); 67 } 68 putchar('\n'); 69 free(cloners); 70 } 71 72 struct clone_defcb { 73 union { 74 char ifprefix[IFNAMSIZ]; 75 clone_match_func *ifmatch; 76 }; 77 clone_match_type clone_mt; 78 clone_callback_func *clone_cb; 79 SLIST_ENTRY(clone_defcb) next; 80 }; 81 82 static SLIST_HEAD(, clone_defcb) clone_defcbh = 83 SLIST_HEAD_INITIALIZER(clone_defcbh); 84 85 void 86 clone_setdefcallback_prefix(const char *ifprefix, clone_callback_func *p) 87 { 88 struct clone_defcb *dcp; 89 90 dcp = malloc(sizeof(*dcp)); 91 strlcpy(dcp->ifprefix, ifprefix, IFNAMSIZ-1); 92 dcp->clone_mt = MT_PREFIX; 93 dcp->clone_cb = p; 94 SLIST_INSERT_HEAD(&clone_defcbh, dcp, next); 95 } 96 97 void 98 clone_setdefcallback_filter(clone_match_func *filter, clone_callback_func *p) 99 { 100 struct clone_defcb *dcp; 101 102 dcp = malloc(sizeof(*dcp)); 103 dcp->ifmatch = filter; 104 dcp->clone_mt = MT_FILTER; 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(if_ctx *ctx, void *arg __unused) 117 { 118 struct ifreq ifr = {}; 119 struct clone_defcb *dcp; 120 121 strlcpy(ifr.ifr_name, ctx->ifname, sizeof(ifr.ifr_name)); 122 123 /* Try to find a default callback by filter */ 124 SLIST_FOREACH(dcp, &clone_defcbh, next) { 125 if (dcp->clone_mt == MT_FILTER && 126 dcp->ifmatch(ifr.ifr_name) != 0) 127 break; 128 } 129 130 if (dcp == NULL) { 131 /* Try to find a default callback by prefix */ 132 SLIST_FOREACH(dcp, &clone_defcbh, next) { 133 if (dcp->clone_mt == MT_PREFIX && 134 strncmp(dcp->ifprefix, ifr.ifr_name, 135 strlen(dcp->ifprefix)) == 0) 136 break; 137 } 138 } 139 140 if (dcp == NULL || dcp->clone_cb == NULL) { 141 /* NB: no parameters */ 142 ifcreate_ioctl(ctx, &ifr); 143 } else { 144 dcp->clone_cb(ctx, &ifr); 145 } 146 } 147 148 static void 149 clone_create(if_ctx *ctx __unused, const char *cmd __unused, int d __unused) 150 { 151 callback_register(ifclonecreate, NULL); 152 } 153 154 static void 155 clone_destroy(if_ctx *ctx, const char *cmd __unused, int d __unused) 156 { 157 struct ifreq ifr = {}; 158 159 if (ioctl_ctx_ifr(ctx, SIOCIFDESTROY, &ifr) < 0) 160 err(1, "SIOCIFDESTROY"); 161 } 162 163 static struct cmd clone_cmds[] = { 164 DEF_CLONE_CMD("create", 0, clone_create), 165 DEF_CMD("destroy", 0, clone_destroy), 166 DEF_CLONE_CMD("plumb", 0, clone_create), 167 DEF_CMD("unplumb", 0, clone_destroy), 168 }; 169 170 static void 171 clone_Copt_cb(const char *arg __unused) 172 { 173 list_cloners(); 174 exit(exit_code); 175 } 176 static struct option clone_Copt = { .opt = "C", .opt_usage = "[-C]", .cb = clone_Copt_cb }; 177 178 static __constructor void 179 clone_ctor(void) 180 { 181 size_t i; 182 183 for (i = 0; i < nitems(clone_cmds); i++) 184 cmd_register(&clone_cmds[i]); 185 opt_register(&clone_Copt); 186 } 187