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📄 Makefile.inc(5.08 KB)
📄 Symbol.map(2.8 KB)
📄 base64.c(10.39 KB)
📄 byteorder.3(2.74 KB)
📄 ether_addr.c(5.68 KB)
📄 ethers.3(5.85 KB)
📄 eui64.3(6.37 KB)
📄 eui64.c(8.3 KB)
📄 gai_strerror.3(2.49 KB)
📄 gai_strerror.c(3.98 KB)
📄 getaddrinfo.3(12.12 KB)
📄 getaddrinfo.c(70.2 KB)
📄 gethostbydns.c(19.1 KB)
📄 gethostbyht.c(9.04 KB)
📄 gethostbyname.3(8.74 KB)
📄 gethostbynis.c(6.94 KB)
📄 gethostnamadr.c(17.01 KB)
📄 getifaddrs.3(4.24 KB)
📄 getifaddrs.c(8.57 KB)
📄 getifmaddrs.3(3 KB)
📄 getifmaddrs.c(4.79 KB)
📄 getipnodebyname.3(10.04 KB)
📄 getnameinfo.3(7.6 KB)
📄 getnameinfo.c(13.68 KB)
📄 getnetbydns.c(12 KB)
📄 getnetbyht.c(7.18 KB)
📄 getnetbynis.c(6.09 KB)
📄 getnetent.3(4.36 KB)
📄 getnetnamadr.c(10.46 KB)
📄 getproto.c(3.87 KB)
📄 getprotoent.3(3.78 KB)
📄 getprotoent.c(12.22 KB)
📄 getprotoname.c(4.25 KB)
📄 getservent.3(4.13 KB)
📄 getservent.c(29.69 KB)
📄 hesiod.3(4.19 KB)
📄 hesiod.c(12.17 KB)
📄 hosts(1.01 KB)
📄 hosts.equiv(53 B)
📄 if_indextoname.3(3.94 KB)
📄 if_indextoname.c(2.94 KB)
📄 if_nameindex.c(4.21 KB)
📄 if_nametoindex.c(2.84 KB)
📄 inet.3(7.76 KB)
📄 inet6_opt_init.3(9.07 KB)
📄 inet6_option_space.3(2.18 KB)
📄 inet6_rth_space.3(6.86 KB)
📄 inet6_rthdr_space.3(2.22 KB)
📄 inet_net.3(5.01 KB)
📄 ip6opt.c(15.36 KB)
📄 linkaddr.3(3.94 KB)
📄 linkaddr.c(4.44 KB)
📄 map_v4v6.c(3.93 KB)
📄 name6.c(28.18 KB)
📄 netdb_private.h(5.2 KB)
📄 networks(310 B)
📄 nscache.c(10.91 KB)
📄 nscachedcli.c(14.18 KB)
📄 nsdispatch.3(6.25 KB)
📄 nsdispatch.c(20.3 KB)
📄 nslexer.l(3.01 KB)
📄 nsparser.y(3.91 KB)
📄 nss_backends.h(2.04 KB)
📄 nss_compat.c(7.93 KB)
📄 nsswitch.conf(272 B)
📄 ntoh.c(1.75 KB)
📄 protocols(6.24 KB)
📄 rcmd.3(8.14 KB)
📄 rcmd.c(18.57 KB)
📄 rcmdsh.3(3.23 KB)
📄 rcmdsh.c(4.95 KB)
📄 recv.c(2.22 KB)
📄 res_config.h(299 B)
📄 resolver.3(11.43 KB)
📄 rthdr.c(9.7 KB)
📄 sctp_bindx.3(3.47 KB)
📄 sctp_connectx.3(3.44 KB)
📄 sctp_freepaddrs.3(2.26 KB)
📄 sctp_getaddrlen.3(2.82 KB)
📄 sctp_getassocid.3(2.44 KB)
📄 sctp_getpaddrs.3(3.11 KB)
📄 sctp_opt_info.3(3.55 KB)
📄 sctp_recvmsg.3(8.43 KB)
📄 sctp_send.3(11.12 KB)
📄 sctp_sendmsg.3(10.45 KB)
📄 sctp_sys_calls.c(30.35 KB)
📄 send.c(2.23 KB)
📄 sockatmark.3(3.26 KB)
📄 sockatmark.c(1.59 KB)
📄 sourcefilter.3(6.38 KB)
📄 sourcefilter.c(9.71 KB)
📄 vars.c(2.07 KB)

Editing: if_nametoindex.c

/*	$KAME: if_nametoindex.c,v 1.6 2000/11/24 08:18:54 itojun Exp $	*/

/*-
 * SPDX-License-Identifier: BSD-1-Clause
 *
 * Copyright (c) 1997, 2000
 *	Berkeley Software Design, Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * THIS SOFTWARE IS PROVIDED BY Berkeley Software Design, Inc. ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL Berkeley Software Design, Inc. BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	BSDI Id: if_nametoindex.c,v 2.3 2000/04/17 22:38:05 dab Exp
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include "namespace.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <ifaddrs.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include "un-namespace.h"

/*
 * From RFC 2553:
 *
 * 4.1 Name-to-Index
 *
 *
 *    The first function maps an interface name into its corresponding
 *    index.
 *
 *       #include <net/if.h>
 *
 *       unsigned int  if_nametoindex(const char *ifname);
 *
 *    If the specified interface name does not exist, the return value is
 *    0, and errno is set to ENXIO.  If there was a system error (such as
 *    running out of memory), the return value is 0 and errno is set to the
 *    proper value (e.g., ENOMEM).
 */

unsigned int
if_nametoindex(const char *ifname)
{
	int s;
	struct ifreq ifr;
	struct ifaddrs *ifaddrs, *ifa;
	unsigned int ni;

s = _socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0);
	if (s != -1) {
		memset(&ifr, 0, sizeof(ifr));
		strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
		if (_ioctl(s, SIOCGIFINDEX, &ifr) != -1) {
			_close(s);
			return (ifr.ifr_index);
		}
		_close(s);
	}

if (getifaddrs(&ifaddrs) < 0)
		return(0);

ni = 0;

for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {
		if (ifa->ifa_addr &&
		    ifa->ifa_addr->sa_family == AF_LINK &&
		    strcmp(ifa->ifa_name, ifname) == 0) {
			ni = LLINDEX((struct sockaddr_dl*)ifa->ifa_addr);
			break;
		}
	}

freeifaddrs(ifaddrs);
	if (!ni)
		errno = ENXIO;
	return(ni);
}

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Editing: if_nametoindex.c

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