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/*
* net helpers
*
* Copyright (C) 2010 Mike Christie
* Copyright (C) 2010 Red Hat, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*/
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <net/if.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include "sysdeps.h"
#include "ethtool-copy.h"
#include "iscsi_net_util.h"
#include "log.h"
/**
* net_get_dev_from_hwaddress - given a hwaddress return the ethX
* @hwaddress: hw address no larger than ISCSI_HWADDRESS_BUF_SIZE
* @netdev: buffer of IFNAMSIZ size that will hold the ethX
*
* Does not support interfaces like a bond or alias because
* multiple interfaces will have the same hwaddress.
*/
int net_get_dev_from_hwaddress(char *hwaddress, char *netdev)
{
struct if_nameindex *ifni;
struct ifreq if_hwaddr;
int found = 0, sockfd, i = 0;
unsigned char *hwaddr;
char tmp_hwaddress[ISCSI_HWADDRESS_BUF_SIZE];
ifni = if_nameindex();
if (ifni == NULL) {
log_error("Could not match hwaddress %s to netdev. "
"getifaddrs failed %d", hwaddress, errno);
return errno;
}
/* Open a basic socket. */
sockfd = socket(AF_INET, SOCK_DGRAM, 0);
if (sockfd < 0) {
log_error("Could not open socket for ioctl.");
goto free_ifni;
}
for (i = 0; ifni[i].if_index && ifni[i].if_name; i++) {
struct if_nameindex *n = &ifni[i];
strlcpy(if_hwaddr.ifr_name, n->if_name, IFNAMSIZ);
if (ioctl(sockfd, SIOCGIFHWADDR, &if_hwaddr) < 0) {
log_error("Could not match %s to netdevice.",
hwaddress);
continue;
}
/* check for ARPHRD_ETHER (ethernet) */
if (if_hwaddr.ifr_hwaddr.sa_family != 1)
continue;
hwaddr = (unsigned char *)if_hwaddr.ifr_hwaddr.sa_data;
memset(tmp_hwaddress, 0, ISCSI_HWADDRESS_BUF_SIZE);
/* TODO should look and covert so we do not need tmp buf */
sprintf(tmp_hwaddress, "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x",
hwaddr[0], hwaddr[1], hwaddr[2], hwaddr[3],
hwaddr[4], hwaddr[5]);
log_debug(4, "Found hardware address %s", tmp_hwaddress);
if (!strcasecmp(tmp_hwaddress, hwaddress)) {
log_debug(4, "Matches %s to %s", hwaddress,
n->if_name);
memset(netdev, 0, IFNAMSIZ);
strlcpy(netdev, n->if_name, IFNAMSIZ);
found = 1;
break;
}
}
close(sockfd);
free_ifni:
if_freenameindex(ifni);
if (!found)
return ENODEV;
return 0;
}
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