/* $KAME: ifname.c,v 1.4 2001/08/20 02:32:40 itojun Exp $ */
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/* $KAME: ifname.c,v 1.4 2001/08/20 02:32:40 itojun Exp $ */
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/*
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* All rights reserved.
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* All rights reserved.
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*
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*
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* Redistribution and use in source and binary forms, with or without
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* modification, are permitted provided that the following conditions
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* are met:
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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* without specific prior written permission.
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*
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* SUCH DAMAGE.
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*/
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*/
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#include <sys/cdefs.h>
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#include <sys/types.h>
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#include <sys/types.h>
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#include <sys/types.h>
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/*
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/*
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* TODO:
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* TODO:
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* - prototype defs into arpa/inet.h, not net/if.h (bsd-api-new-02)
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* - prototype defs into arpa/inet.h, not net/if.h (bsd-api-new-02)
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*/
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*/
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#include <sys/param.h>
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <sys/sockio.h>
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#include <sys/sysctl.h>
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#include <sys/sysctl.h>
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#include <net/if.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <net/route.h>
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#include <net/if_dl.h>
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#include <net/if_dl.h>
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#include <unistd.h>
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#include <unistd.h>
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#include <errno.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <stdlib.h>
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#include <string.h>
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#include <string.h>
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#define ROUNDUP(a) \
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#define ROUNDUP(a) \
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((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
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((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
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#define ADVANCE(x, n)
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#define ADVANCE(x, n)
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static unsigned int
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static unsigned int
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if_onametoindex(ifname)
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if_onametoindex(ifname)
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const char *ifname;
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const char *ifname;
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{
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{
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struct if_nameindex *iff = if_nameindex(), *ifx;
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struct if_nameindex *iff = if_nameindex(), *ifx;
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int ret;
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int ret;
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if (iff == NULL) return 0;
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if (iff == NULL) return 0;
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ifx = iff;
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ifx = iff;
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while (ifx->if_name != NULL) {
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while (ifx->if_name != NULL) {
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if (strcmp(ifx->if_name, ifname) == 0) {
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if (strcmp(ifx->if_name, ifname) == 0) {
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ret = ifx->if_index;
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ret = ifx->if_index;
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if_freenameindex(iff);
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if_freenameindex(iff);
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return ret;
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return ret;
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}
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}
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ifx++;
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ifx++;
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}
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}
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if_freenameindex(iff);
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if_freenameindex(iff);
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errno = ENXIO;
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errno = ENXIO;
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return 0;
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return 0;
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}
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}
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unsigned int
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unsigned int
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if_nametoindex(ifname)
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if_nametoindex(ifname)
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const char *ifname;
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const char *ifname;
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{
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{
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int s;
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int s;
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struct ifreq ifr;
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struct ifreq ifr;
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s = socket(AF_INET, SOCK_DGRAM, 0);
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s = socket(AF_INET, SOCK_DGRAM, 0);
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if (s == -1)
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if (s == -1)
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return (0);
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return (0);
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strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
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strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
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if (ioctl(s, SIOCGIFINDEX, &ifr) == -1) {
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if (ioctl(s, SIOCGIFINDEX, &ifr) == -1) {
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close (s);
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close (s);
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return (if_onametoindex(ifname));
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return (if_onametoindex(ifname));
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}
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}
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close(s);
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close(s);
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return (ifr.ifr_index);
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return (ifr.ifr_index);
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}
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}
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char *
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char *
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if_indextoname(ifindex, ifname)
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if_indextoname(ifindex, ifname)
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unsigned int ifindex;
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unsigned int ifindex;
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char *ifname; /* at least IF_NAMESIZE */
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char *ifname; /* at least IF_NAMESIZE */
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{
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{
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struct if_nameindex *iff = if_nameindex(), *ifx;
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struct if_nameindex *iff = if_nameindex(), *ifx;
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char *cp, *dp;
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char *cp, *dp;
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if (iff == NULL) return NULL;
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if (iff == NULL) return NULL;
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ifx = iff;
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ifx = iff;
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while (ifx->if_index != 0) {
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while (ifx->if_index != 0) {
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if (ifx->if_index == ifindex) {
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if (ifx->if_index == ifindex) {
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cp = ifname;
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cp = ifname;
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dp = ifx->if_name;
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dp = ifx->if_name;
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while ((*cp++ = *dp++)) ;
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while ((*cp++ = *dp++)) ;
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if_freenameindex(iff);
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if_freenameindex(iff);
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return (ifname);
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return (ifname);
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}
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}
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ifx++;
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ifx++;
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}
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}
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if_freenameindex(iff);
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if_freenameindex(iff);
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errno = ENXIO;
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errno = ENXIO;
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return NULL;
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return NULL;
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}
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}
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struct if_nameindex *
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struct if_nameindex *
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if_nameindex()
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if_nameindex()
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{
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{
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size_t needed;
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size_t needed;
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int mib[6], i, ifn = 0, off = 0, hlen;
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int mib[6], i, ifn = 0, off = 0, hlen;
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char *buf = NULL, *lim, *next, *cp, *ifbuf = NULL;
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char *buf = NULL, *lim, *next, *cp, *ifbuf = NULL;
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struct rt_msghdr *rtm;
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struct rt_msghdr *rtm;
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struct if_msghdr *ifm;
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struct if_msghdr *ifm;
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struct sockaddr *sa;
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struct sockaddr *sa;
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struct if_nameindex *ret = NULL;
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struct if_nameindex *ret = NULL;
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static int ifxs = 64; /* initial upper limit */
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static int ifxs = 64; /* initial upper limit */
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struct _ifx {
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struct _ifx {
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int if_index;
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int if_index;
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int if_off;
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int if_off;
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} *ifx = NULL;
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} *ifx = NULL;
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mib[0] = CTL_NET;
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mib[0] = CTL_NET;
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mib[1] = PF_ROUTE;
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mib[1] = PF_ROUTE;
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mib[2] = 0; /* protocol */
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mib[2] = 0; /* protocol */
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mib[3] = 0; /* wildcard address family */
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mib[3] = 0; /* wildcard address family */
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mib[4] = 0;
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mib[4] = 0;
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mib[5] = 0; /* no flags */
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mib[5] = 0; /* no flags */
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if (__sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
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if (__sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
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return NULL;
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return NULL;
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if ((buf = malloc(needed)) == NULL) {
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if ((buf = malloc(needed)) == NULL) {
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errno = ENOMEM;
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errno = ENOMEM;
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goto end;
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goto end;
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}
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}
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/* XXX: we may have allocated too much than necessary */
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/* XXX: we may have allocated too much than necessary */
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if ((ifbuf = malloc(needed)) == NULL) {
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if ((ifbuf = malloc(needed)) == NULL) {
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errno = ENOMEM;
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errno = ENOMEM;
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goto end;
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goto end;
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}
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}
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if ((ifx = (struct _ifx *)malloc(sizeof(*ifx) * ifxs)) == NULL) {
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if ((ifx = (struct _ifx *)malloc(sizeof(*ifx) * ifxs)) == NULL) {
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errno = ENOMEM;
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errno = ENOMEM;
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goto end;
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goto end;
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}
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}
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if (__sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
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if (__sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
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/* sysctl has set errno */
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/* sysctl has set errno */
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goto end;
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goto end;
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}
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}
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lim = buf + needed;
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lim = buf + needed;
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for (next = buf; next < lim; next += rtm->rtm_msglen) {
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for (next = buf; next < lim; next += rtm->rtm_msglen) {
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rtm = (struct rt_msghdr *)next;
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rtm = (struct rt_msghdr *)next;
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if (rtm->rtm_version != RTM_VERSION) {
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if (rtm->rtm_version != RTM_VERSION) {
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errno = EPROTONOSUPPORT;
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errno = EPROTONOSUPPORT;
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goto end;
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goto end;
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}
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}
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switch (rtm->rtm_type) {
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switch (rtm->rtm_type) {
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case RTM_IFINFO:
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case RTM_IFINFO:
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ifm = (struct if_msghdr *)rtm;
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ifm = (struct if_msghdr *)rtm;
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ifx[ifn].if_index = ifm->ifm_index;
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ifx[ifn].if_index = ifm->ifm_index;
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ifx[ifn].if_off = off;
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ifx[ifn].if_off = off;
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cp = (char *)(ifm + 1);
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cp = (char *)(ifm + 1);
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for (i = 1; i; i <<= 1) {
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for (i = 1; i; i <<= 1) {
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if (i & ifm->ifm_addrs) {
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if (i & ifm->ifm_addrs) {
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sa = (struct sockaddr *)cp;
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sa = (struct sockaddr *)cp;
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ADVANCE(cp, sa);
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ADVANCE(cp, sa);
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}
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}
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}
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}
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if (++ifn == ifxs) {
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if (++ifn == ifxs) {
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/* we need more memory */
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/* we need more memory */
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struct _ifx *newifx;
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struct _ifx *newifx;
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ifxs *= 2;
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ifxs *= 2;
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if ((newifx = (struct _ifx *)malloc(sizeof(*newifx) * ifxs)) == NULL) {
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if ((newifx = (struct _ifx *)malloc(sizeof(*newifx) * ifxs)) == NULL) {
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errno = ENOMEM;
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errno = ENOMEM;
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goto end;
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goto end;
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}
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}
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/* copy and free old data */
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/* copy and free old data */
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memcpy(newifx, ifx, (sizeof(*ifx) * ifxs) / 2);
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memcpy(newifx, ifx, (sizeof(*ifx) * ifxs) / 2);
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free(ifx);
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free(ifx);
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ifx = newifx;
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ifx = newifx;
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}
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}
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}
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}
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}
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}
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hlen = sizeof(struct if_nameindex) * (ifn + 1);
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hlen = sizeof(struct if_nameindex) * (ifn + 1);
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if ((cp = (char *)malloc(hlen + off)) == NULL) {
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if ((cp = (char *)malloc(hlen + off)) == NULL) {
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errno = ENOMEM;
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errno = ENOMEM;
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goto end;
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goto end;
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}
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}
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bcopy(ifbuf, cp + hlen, off);
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bcopy(ifbuf, cp + hlen, off);
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ret = (struct if_nameindex *)cp;
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ret = (struct if_nameindex *)cp;
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for (i = 0; i < ifn; i++) {
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for (i = 0; i < ifn; i++) {
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ret[i].if_index = ifx[i].if_index;
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ret[i].if_index = ifx[i].if_index;
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ret[i].if_name = cp + hlen + ifx[i].if_off;
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ret[i].if_name = cp + hlen + ifx[i].if_off;
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}
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}
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ret[ifn].if_index = 0;
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ret[ifn].if_index = 0;
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ret[ifn].if_name = NULL;
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ret[ifn].if_name = NULL;
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end:
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end:
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if (buf) free(buf);
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if (buf) free(buf);
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if (ifbuf) free(ifbuf);
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if (ifbuf) free(ifbuf);
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if (ifx) free(ifx);
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if (ifx) free(ifx);
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return ret;
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return ret;
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}
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}
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void if_freenameindex(ptr)
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void if_freenameindex(ptr)
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struct if_nameindex *ptr;
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struct if_nameindex *ptr;
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{
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{
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free(ptr);
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free(ptr);
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}
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}
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