111 lines
3.5 KiB
C
111 lines
3.5 KiB
C
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/**
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* @file get_iface_info.h
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* @author Ambroz Bizjak <ambrop7@gmail.com>
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*
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* @section LICENSE
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*
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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 are met:
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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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* 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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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef BADVPN_GETIFACEINFO_H
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#define BADVPN_GETIFACEINFO_H
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#include <stdio.h>
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#include <string.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <net/if_arp.h>
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#include <sys/ioctl.h>
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#include <misc/debug.h>
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/**
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* Returns information about a network interface with the given name.
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*
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* @param ifname name of interface to get information for
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* @param out_mac the MAC address will be returned here, unless NULL
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* @param out_mtu the MTU will be returned here, unless NULL
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* @param out_ifindex the interface index will be returned here, unless NULL
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* @return 1 on success, 0 on failure
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*/
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static int badvpn_get_iface_info (const char *ifname, uint8_t *out_mac, int *out_mtu, int *out_ifindex) WARN_UNUSED;
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static int badvpn_get_iface_info (const char *ifname, uint8_t *out_mac, int *out_mtu, int *out_ifindex)
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{
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ASSERT(ifname)
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struct ifreq ifr;
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int s = socket(AF_INET, SOCK_DGRAM, 0);
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if (s < 0) {
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goto fail0;
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}
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// get MAC
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if (out_mac) {
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memset(&ifr, 0, sizeof(ifr));
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snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s", ifname);
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if (ioctl(s, SIOCGIFHWADDR, &ifr)) {
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goto fail1;
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}
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if (ifr.ifr_hwaddr.sa_family != ARPHRD_ETHER) {
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goto fail1;
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}
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memcpy(out_mac, ifr.ifr_hwaddr.sa_data, 6);
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}
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// get MTU
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if (out_mtu) {
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memset(&ifr, 0, sizeof(ifr));
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snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s", ifname);
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if (ioctl(s, SIOCGIFMTU, &ifr)) {
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goto fail1;
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}
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*out_mtu = ifr.ifr_mtu;
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}
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// get interface index
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if (out_ifindex) {
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memset(&ifr, 0, sizeof(ifr));
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snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s", ifname);
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if (ioctl(s, SIOCGIFINDEX, &ifr)) {
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goto fail1;
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}
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*out_ifindex = ifr.ifr_ifindex;
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}
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close(s);
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return 1;
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fail1:
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close(s);
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fail0:
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return 0;
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}
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#endif
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