ifclone.c revision 177799
177542Swpaul/* 277542Swpaul * Copyright (c) 1983, 1993 377542Swpaul * The Regents of the University of California. All rights reserved. 477542Swpaul * 577542Swpaul * Redistribution and use in source and binary forms, with or without 677542Swpaul * modification, are permitted provided that the following conditions 777542Swpaul * are met: 877542Swpaul * 1. Redistributions of source code must retain the above copyright 977542Swpaul * notice, this list of conditions and the following disclaimer. 1077542Swpaul * 2. Redistributions in binary form must reproduce the above copyright 1177542Swpaul * notice, this list of conditions and the following disclaimer in the 1277542Swpaul * documentation and/or other materials provided with the distribution. 1377542Swpaul * 4. Neither the name of the University nor the names of its contributors 1477542Swpaul * may be used to endorse or promote products derived from this software 1577542Swpaul * without specific prior written permission. 1677542Swpaul * 1777542Swpaul * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 1877542Swpaul * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1977542Swpaul * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2077542Swpaul * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2177542Swpaul * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2277542Swpaul * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2377542Swpaul * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2477542Swpaul * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2577542Swpaul * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2677542Swpaul * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2777542Swpaul * SUCH DAMAGE. 2877542Swpaul */ 2977542Swpaul 3077542Swpaul#ifndef lint 3177542Swpaulstatic const char rcsid[] = 3277542Swpaul "$FreeBSD: head/sbin/ifconfig/ifclone.c 177799 2008-03-31 15:38:07Z sam $"; 3377542Swpaul#endif /* not lint */ 3477542Swpaul 3577542Swpaul#include <sys/types.h> 3677542Swpaul#include <sys/ioctl.h> 3777542Swpaul#include <sys/socket.h> 3877542Swpaul#include <net/if.h> 3977542Swpaul 4077542Swpaul#include <err.h> 4177542Swpaul#include <stdio.h> 4277542Swpaul#include <stdlib.h> 4377542Swpaul#include <string.h> 4477542Swpaul#include <unistd.h> 4577542Swpaul 4677542Swpaul#include "ifconfig.h" 4777542Swpaul 4877542Swpaulstatic void 4977542Swpaullist_cloners(void) 5077542Swpaul{ 5177542Swpaul struct if_clonereq ifcr; 5277542Swpaul char *cp, *buf; 5377542Swpaul int idx; 5477542Swpaul int s; 5577542Swpaul 5677542Swpaul s = socket(AF_INET, SOCK_DGRAM, 0); 5777542Swpaul if (s == -1) 5877542Swpaul err(1, "socket(AF_INET,SOCK_DGRAM)"); 5977542Swpaul 6077542Swpaul memset(&ifcr, 0, sizeof(ifcr)); 6177542Swpaul 6277542Swpaul if (ioctl(s, SIOCIFGCLONERS, &ifcr) < 0) 6377542Swpaul err(1, "SIOCIFGCLONERS for count"); 6477542Swpaul 6577542Swpaul buf = malloc(ifcr.ifcr_total * IFNAMSIZ); 6677542Swpaul if (buf == NULL) 6777542Swpaul err(1, "unable to allocate cloner name buffer"); 6877542Swpaul 6977542Swpaul ifcr.ifcr_count = ifcr.ifcr_total; 7077542Swpaul ifcr.ifcr_buffer = buf; 7177542Swpaul 7277542Swpaul if (ioctl(s, SIOCIFGCLONERS, &ifcr) < 0) 7377542Swpaul err(1, "SIOCIFGCLONERS for names"); 7477542Swpaul 7577542Swpaul /* 7677542Swpaul * In case some disappeared in the mean time, clamp it down. 7777542Swpaul */ 7877542Swpaul if (ifcr.ifcr_count > ifcr.ifcr_total) 7977542Swpaul ifcr.ifcr_count = ifcr.ifcr_total; 8077542Swpaul 8177542Swpaul for (cp = buf, idx = 0; idx < ifcr.ifcr_count; idx++, cp += IFNAMSIZ) { 8277542Swpaul if (idx > 0) 8377542Swpaul putchar(' '); 8477542Swpaul printf("%s", cp); 8577542Swpaul } 8677542Swpaul 8777542Swpaul putchar('\n'); 8877542Swpaul free(buf); 8977542Swpaul} 9077542Swpaul 9177542Swpaulstatic clone_callback_func *clone_cb = NULL; 9277542Swpaul 9377542Swpaulvoid 9477542Swpaulclone_setcallback(clone_callback_func *p) 9577542Swpaul{ 9677542Swpaul if (clone_cb != NULL && clone_cb != p) 9777542Swpaul errx(1, "conflicting device create parameters"); 9877542Swpaul clone_cb = p; 9977542Swpaul} 10077542Swpaul 10177542Swpaul/* 10277542Swpaul * Do the actual clone operation. Any parameters must have been 10377542Swpaul * setup by now. If a callback has been setup to do the work 10477542Swpaul * then defer to it; otherwise do a simple create operation with 10577542Swpaul * no parameters. 10677542Swpaul */ 10777542Swpaulstatic void 10877542Swpaulifclonecreate(int s, void *arg) 10977542Swpaul{ 11077542Swpaul struct ifreq ifr; 11177542Swpaul 11277542Swpaul memset(&ifr, 0, sizeof(ifr)); 11377542Swpaul (void) strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name)); 11477542Swpaul if (clone_cb == NULL) { 11577542Swpaul /* NB: no parameters */ 11677542Swpaul if (ioctl(s, SIOCIFCREATE2, &ifr) < 0) 11777542Swpaul err(1, "SIOCIFCREATE2"); 11877542Swpaul } else { 11977542Swpaul clone_cb(s, &ifr); 12077542Swpaul } 12177542Swpaul 12277542Swpaul /* 12377542Swpaul * If we get a different name back than we put in, print it. 12477542Swpaul */ 12577542Swpaul if (strncmp(name, ifr.ifr_name, sizeof(name)) != 0) { 12677542Swpaul strlcpy(name, ifr.ifr_name, sizeof(name)); 12777542Swpaul printf("%s\n", name); 12899498Salfred } 12999498Salfred} 13099498Salfred 13177542Swpaulstatic 13299498SalfredDECL_CMD_FUNC(clone_create, arg, d) 13399498Salfred{ 13499498Salfred callback_register(ifclonecreate, NULL); 13599498Salfred} 13677542Swpaul 13799498Salfredstatic 13899498SalfredDECL_CMD_FUNC(clone_destroy, arg, d) 13999498Salfred{ 14099498Salfred (void) strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name)); 14199498Salfred if (ioctl(s, SIOCIFDESTROY, &ifr) < 0) 14299498Salfred err(1, "SIOCIFDESTROY"); 14399498Salfred} 14499498Salfred 14599498Salfredstatic struct cmd clone_cmds[] = { 14699498Salfred DEF_CLONE_CMD("create", 0, clone_create), 14799498Salfred DEF_CMD("destroy", 0, clone_destroy), 14899498Salfred DEF_CLONE_CMD("plumb", 0, clone_create), 14999498Salfred DEF_CMD("unplumb", 0, clone_destroy), 15099498Salfred}; 15199498Salfred 15277542Swpaulstatic void 15399498Salfredclone_Copt_cb(const char *optarg __unused) 15499498Salfred{ 15577542Swpaul list_cloners(); 15699498Salfred exit(0); 15799498Salfred} 15899498Salfredstatic struct option clone_Copt = { "C", "[-C]", clone_Copt_cb }; 15977542Swpaul 16099498Salfredstatic __constructor void 16199498Salfredclone_ctor(void) 16299498Salfred{ 16399498Salfred#define N(a) (sizeof(a) / sizeof(a[0])) 16499498Salfred int i; 16577542Swpaul 16677542Swpaul for (i = 0; i < N(clone_cmds); i++) 16777542Swpaul cmd_register(&clone_cmds[i]); 16877542Swpaul opt_register(&clone_Copt); 16977542Swpaul#undef N 17077542Swpaul} 17177542Swpaul