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hostnics.c
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/*====================================================================*
*
* Copyright (c) 2013 Qualcomm Atheros, Inc.
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted (subject to the limitations
* in the disclaimer below) provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* * Neither the name of Qualcomm Atheros nor the names of
* its contributors may be used to endorse or promote products
* derived from this software without specific prior written
* permission.
*
* NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE
* GRANTED BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE
* COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT OWNER
* OR CONTRIBUTORS 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.
*
*--------------------------------------------------------------------*/
/*====================================================================*
*
* unsigned hostnics (struct nic list [], unsigned size);
*
* ether.h
*
* encode an external memory region with a packed list of available
* nost network interfaces; return the number of interfaces found;
* each interface has an index, ethernet address, internet address,
* name and description;
*
* this function is implemented for Linux and MacOSX;
*
*
* Contributor(s):
* Charles Maier <cmaier@qca.qualcomm.com>
*
*--------------------------------------------------------------------*/
#ifndef HOSTNICS_SOURCE
#define HOSTNICS_SOURCE
#if defined (__linux__)
# include <net/if.h>
# include <net/ethernet.h>
# include <sys/ioctl.h>
#elif defined (__linux__)
# include <net/if.h>
# include <netpacket/packet.h>
# include <ifaddrs.h>
#elif defined (__APPLE__) || defined (__OpenBSD__)
# include <sys/types.h>
# include <sys/socket.h>
# include <net/if.h>
# include <net/if_dl.h>
# include <net/if_types.h>
# include <ifaddrs.h>
#elif defined (WIN32)
#error "Not implemented for Windows"
#else
#error "Unknown environment"
#endif
#include <unistd.h>
#include <memory.h>
#include <errno.h>
#include "../ether/ether.h"
#include "../tools/error.h"
unsigned hostnics (struct nic nics [], unsigned size)
{
#if defined (__linux__)
/*
* native method on Linux systems;
*/
char buffer [1024];
struct ifconf ifconf;
struct ifreq * ifreq;
unsigned next;
signed fd;
memset (nics, 0, size * sizeof (struct nic));
ifconf.ifc_len = sizeof (buffer);
ifconf.ifc_buf = buffer;
if ((fd = socket (AF_INET, SOCK_DGRAM, 0)) < 0)
{
error (1, errno, "Can't open socket");
}
if (ioctl (fd, SIOCGIFCONF, &ifconf) < 0)
{
error (1, errno, "Can't read socket configuration");
}
ifreq = ifconf.ifc_req;
next = ifconf.ifc_len / sizeof (struct ifreq);
if (next > size)
{
next = size;
}
if (next < size)
{
size = next;
}
for (next = 0; next < size; next++)
{
struct nic * nic = &nics [next];
struct sockaddr_in * sockaddr_in = (struct sockaddr_in *)(&ifreq->ifr_addr);
memcpy (nic->ifname, ifreq->ifr_name, sizeof (nic->ifname));
memcpy (nic->ifdesc, ifreq->ifr_name, sizeof (nic->ifdesc));
memcpy (nic->internet, &sockaddr_in->sin_addr, sizeof (nic->internet));
if (ioctl (fd, SIOCGIFHWADDR, ifreq) == -1)
{
error (0, errno, "Can't read hardware address: %s", ifreq->ifr_name);
}
memcpy (nic->ethernet, ifreq->ifr_hwaddr.sa_data, sizeof (nic->ethernet));
if (ioctl (fd, SIOCGIFINDEX, ifreq) == -1)
{
error (0, errno, "Can't read interface index: %s", ifreq->ifr_name);
}
nic->ifindex = ifreq->ifr_ifindex;
ifreq++;
}
close (fd);
#elif defined (__linux__) || defined (__APPLE__) || defined (__OpenBSD__)
/*
* generic (POSIX) method for unix-like systems;
*/
struct ifaddrs * ifaddrs;
memset (nics, 0, size * sizeof (struct nic));
unsigned next = 0;
if (getifaddrs (&ifaddrs) != -1)
{
struct ifaddrs * ifaddr;
for (ifaddr = ifaddrs; ifaddr && size; ifaddr = ifaddr->ifa_next)
{
struct nic * nic = &nics [next];
struct nic * tmp = nics;
if (!ifaddr->ifa_addr)
{
continue;
}
nic->ifindex = if_nametoindex (ifaddr->ifa_name);
for (tmp = nics; tmp->ifindex != nic->ifindex; tmp++);
if (tmp == nic)
{
next++;
size--;
}
else
{
nic = tmp;
}
memcpy (nic->ifname, ifaddr->ifa_name, sizeof (nic->ifname));
memcpy (nic->ifdesc, ifaddr->ifa_name, sizeof (nic->ifdesc));
if (ifaddr->ifa_addr->sa_family == AF_INET)
{
struct sockaddr_in * sockaddr_in = (struct sockaddr_in *) (ifaddr->ifa_addr);
struct in_addr * in_addr = (struct in_addr *)(&sockaddr_in->sin_addr);
memcpy (nic->internet, &in_addr->s_addr, sizeof (nic->internet));
}
#if defined (__linux__)
#define LLADDR(socket) &(socket)->sll_addr
if (ifaddr->ifa_addr->sa_family == AF_PACKET)
{
struct sockaddr_ll * sockaddr_ll = (struct sockaddr_ll *) (ifaddr->ifa_addr);
memcpy (nic->ethernet, LLADDR (sockaddr_ll), sizeof (nic->ethernet));
}
#elif defined (__APPLE__) || defined (__OpenBSD__)
if (ifaddr->ifa_addr->sa_family == AF_LINK)
{
struct sockaddr_dl * sockaddr_dl = (struct sockaddr_dl *) (ifaddr->ifa_addr);
if (sockaddr_dl->sdl_type == IFT_ETHER)
{
#if 1
memcpy (nic->ethernet, LLADDR (sockaddr_dl), sizeof (nic->ethernet));
#else
memcpy (nic->ethernet, LLADDR (sockaddr_dl), sockaddr_dl->sdl_alen);
#endif
}
}
#else
#error "Abandon all hope!"
#endif
}
freeifaddrs (ifaddrs);
}
#else
#error "Unknown environment"
#endif
return (next);
}
#endif
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