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/* if_index.c
**
** Copyright 2007, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <sys/socket.h>
#include <sys/select.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <linux/if.h>
#include <linux/sockios.h>
#include <linux/route.h>
unsigned int if_nametoindex( const char *ifname )
{
#ifndef SIOCGIFINDEX
return 0;
#else
struct ifreq ifr;
int fd = socket(AF_INET, SOCK_DGRAM, 0);
if (fd < 0)
return 0;
strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
ifr.ifr_ifindex = 0;
if (ioctl (fd, SIOCGIFINDEX, &ifr) < 0) {
return 0;
}
return ifr.ifr_ifindex;
#endif
}
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