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/* $OpenBSD: if.c,v 1.14 2003/06/03 14:28:16 ho Exp $ */
/* $EOM: if.c,v 1.12 1999/10/01 13:45:20 niklas Exp $ */
/*
* Copyright (c) 1998, 1999 Niklas Hallqvist. 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.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
/*
* This code was written under funding by Ericsson Radio Systems.
*/
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#include <stdlib.h>
#include <unistd.h>
#ifdef HAVE_GETIFADDRS
#include <ifaddrs.h>
#endif
#include "sysdep.h"
#include "log.h"
#include "if.h"
#ifndef HAVE_GETIFADDRS
/* XXX Unsafe if either x or y has side-effects. */
#ifndef MAX
#define MAX(x, y) ((x) > (y) ? (x) : (y))
#endif
/* Most boxes has less than 16 interfaces, so this might be a good guess. */
#define INITIAL_IFREQ_COUNT 16
/*
* Get all network interface configurations.
* Return 0 if successful, -1 otherwise.
*/
int
siocgifconf (struct ifconf *ifcp)
{
int s;
int len;
caddr_t buf, new_buf;
/* Get a socket to ask for the network interface configurations. */
s = socket (AF_INET, SOCK_DGRAM, 0);
if (s == -1)
{
log_error ("siocgifconf: socket (AF_INET, SOCK_DGRAM, 0) failed");
return -1;
}
len = sizeof (struct ifreq) * INITIAL_IFREQ_COUNT;
buf = 0;
while (1)
{
/*
* Allocate a larger buffer each time around the loop and get the
* network interfaces configurations into it.
*/
ifcp->ifc_len = len;
new_buf = realloc (buf, len);
if (!new_buf)
{
log_error ("siocgifconf: realloc (%p, %d) failed", buf, len);
goto err;
}
ifcp->ifc_buf = buf = new_buf;
if (ioctl (s, SIOCGIFCONF, ifcp) == -1)
{
log_error ("siocgifconf: ioctl (%d, SIOCGIFCONF, ...) failed", s);
goto err;
}
/*
* If there is place for another ifreq we can be sure that the buffer
* was big enough, otherwise double the size and try again.
*/
if (len - ifcp->ifc_len >= sizeof (struct ifreq))
break;
len *= 2;
}
close (s);
return 0;
err:
if (buf)
free (buf);
close (s);
return -1;
}
#endif
int
if_map (int (*func) (char *, struct sockaddr *, void *), void *arg)
{
int err = 0;
#ifdef HAVE_GETIFADDRS
struct ifaddrs *ifap, *ifa;
if (getifaddrs(&ifap) < 0)
return -1;
for (ifa = ifap; ifa; ifa = ifa->ifa_next)
if ((*func) (ifa->ifa_name, ifa->ifa_addr, arg) == -1)
err = -1;
freeifaddrs(ifap);
#else
struct ifconf ifc;
struct ifreq *ifrp;
caddr_t limit, p;
size_t len;
if (siocgifconf (&ifc))
return -1;
limit = ifc.ifc_buf + ifc.ifc_len;
for (p = ifc.ifc_buf; p < limit; p += len)
{
ifrp = (struct ifreq *)p;
if ((*func) (ifrp->ifr_name, &ifrp->ifr_addr, arg) == -1)
err = -1;
len = sizeof ifrp->ifr_name
+ MAX (sysdep_sa_len (&ifrp->ifr_addr), sizeof ifrp->ifr_addr);
}
free (ifc.ifc_buf);
#endif
return err;
}
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