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 #ifndef FSTACK 74 if (ioctl(s, SIOCIFGCLONERS, &ifcr) < 0) 75 #else 76 size_t offset = (char *)&(ifcr.ifcr_buffer) - (char *)&(ifcr); 77 size_t clen = ifcr.ifcr_total * IFNAMSIZ; 78 if (ioctl_va(s, SIOCIFGCLONERS, &ifcr, 3, offset, buf, clen) < 0) 79 #endif 80 err(1, "SIOCIFGCLONERS for names"); 81 82 /* 83 * In case some disappeared in the mean time, clamp it down. 84 */ 85 if (ifcr.ifcr_count > ifcr.ifcr_total) 86 ifcr.ifcr_count = ifcr.ifcr_total; 87 88 for (cp = buf, idx = 0; idx < ifcr.ifcr_count; idx++, cp += IFNAMSIZ) { 89 if (idx > 0) 90 putchar(' '); 91 printf("%s", cp); 92 } 93 94 putchar('\n'); 95 free(buf); 96 } 97 98 struct clone_defcb { 99 char ifprefix[IFNAMSIZ]; 100 clone_callback_func *clone_cb; 101 SLIST_ENTRY(clone_defcb) next; 102 }; 103 104 static SLIST_HEAD(, clone_defcb) clone_defcbh = 105 SLIST_HEAD_INITIALIZER(clone_defcbh); 106 107 void 108 clone_setdefcallback(const char *ifprefix, clone_callback_func *p) 109 { 110 struct clone_defcb *dcp; 111 112 dcp = malloc(sizeof(*dcp)); 113 strlcpy(dcp->ifprefix, ifprefix, IFNAMSIZ-1); 114 dcp->clone_cb = p; 115 SLIST_INSERT_HEAD(&clone_defcbh, dcp, next); 116 } 117 118 /* 119 * Do the actual clone operation. Any parameters must have been 120 * setup by now. If a callback has been setup to do the work 121 * then defer to it; otherwise do a simple create operation with 122 * no parameters. 123 */ 124 static void 125 ifclonecreate(int s, void *arg) 126 { 127 struct ifreq ifr; 128 struct clone_defcb *dcp; 129 clone_callback_func *clone_cb = NULL; 130 131 memset(&ifr, 0, sizeof(ifr)); 132 (void) strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name)); 133 134 if (clone_cb == NULL) { 135 /* Try to find a default callback */ 136 SLIST_FOREACH(dcp, &clone_defcbh, next) { 137 if (strncmp(dcp->ifprefix, ifr.ifr_name, 138 strlen(dcp->ifprefix)) == 0) { 139 clone_cb = dcp->clone_cb; 140 break; 141 } 142 } 143 } 144 if (clone_cb == NULL) { 145 /* NB: no parameters */ 146 if (ioctl(s, SIOCIFCREATE2, &ifr) < 0) 147 err(1, "SIOCIFCREATE2"); 148 } else { 149 clone_cb(s, &ifr); 150 } 151 152 /* 153 * If we get a different name back than we put in, update record and 154 * indicate it should be printed later. 155 */ 156 if (strncmp(name, ifr.ifr_name, sizeof(name)) != 0) { 157 strlcpy(name, ifr.ifr_name, sizeof(name)); 158 printifname = 1; 159 } 160 } 161 162 static 163 DECL_CMD_FUNC(clone_create, arg, d) 164 { 165 callback_register(ifclonecreate, NULL); 166 } 167 168 static 169 DECL_CMD_FUNC(clone_destroy, arg, d) 170 { 171 (void) strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name)); 172 if (ioctl(s, SIOCIFDESTROY, &ifr) < 0) 173 err(1, "SIOCIFDESTROY"); 174 } 175 176 static struct cmd clone_cmds[] = { 177 DEF_CLONE_CMD("create", 0, clone_create), 178 DEF_CMD("destroy", 0, clone_destroy), 179 DEF_CLONE_CMD("plumb", 0, clone_create), 180 DEF_CMD("unplumb", 0, clone_destroy), 181 }; 182 183 static void 184 clone_Copt_cb(const char *optarg __unused) 185 { 186 list_cloners(); 187 exit(0); 188 } 189 static struct option clone_Copt = { .opt = "C", .opt_usage = "[-C]", .cb = clone_Copt_cb }; 190 191 static __constructor void 192 clone_ctor(void) 193 { 194 size_t i; 195 196 for (i = 0; i < nitems(clone_cmds); i++) 197 cmd_register(&clone_cmds[i]); 198 opt_register(&clone_Copt); 199 } 200