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