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/*
Unix SMB/CIFS implementation.
return a list of network interfaces
Copyright (C) Andrew Tridgell 1998
Copyright (C) Jeremy Allison 2007
Copyright (C) Jelmer Vernooij 2007
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 3 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.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/* working out the interfaces for a OS is an incredibly non-portable
thing. We have several possible implementations below, and autoconf
tries each of them to see what works
Note that this file does _not_ include includes.h. That is so this code
can be called directly from the autoconf tests. That also means
this code cannot use any of the normal Samba debug stuff or defines.
This is standalone code.
*/
#include "includes.h"
#include "system/network.h"
#include "netif.h"
#include "lib/util/tsort.h"
/****************************************************************************
Try the "standard" getifaddrs/freeifaddrs interfaces.
Also gets IPv6 interfaces.
****************************************************************************/
/****************************************************************************
Get the netmask address for a local interface.
****************************************************************************/
static int _get_interfaces(struct iface_struct *ifaces, int max_interfaces)
{
struct ifaddrs *iflist = NULL;
struct ifaddrs *ifptr = NULL;
int total = 0;
if (getifaddrs(&iflist) < 0) {
return -1;
}
/* Loop through interfaces, looking for given IP address */
for (ifptr = iflist, total = 0;
ifptr != NULL && total < max_interfaces;
ifptr = ifptr->ifa_next) {
memset(&ifaces[total], '\0', sizeof(ifaces[total]));
if (!ifptr->ifa_addr || !ifptr->ifa_netmask) {
continue;
}
/* Check the interface is up. */
if (!(ifptr->ifa_flags & IFF_UP)) {
continue;
}
/* We don't support IPv6 *yet* */
if (ifptr->ifa_addr->sa_family != AF_INET) {
continue;
}
ifaces[total].ip = ((struct sockaddr_in *)ifptr->ifa_addr)->sin_addr;
ifaces[total].netmask = ((struct sockaddr_in *)ifptr->ifa_netmask)->sin_addr;
strlcpy(ifaces[total].name, ifptr->ifa_name,
sizeof(ifaces[total].name));
total++;
}
freeifaddrs(iflist);
return total;
}
static int iface_comp(struct iface_struct *i1, struct iface_struct *i2)
{
int r;
r = strcmp(i1->name, i2->name);
if (r) return r;
r = ntohl(i1->ip.s_addr) - ntohl(i2->ip.s_addr);
if (r) return r;
r = ntohl(i1->netmask.s_addr) - ntohl(i2->netmask.s_addr);
return r;
}
/* this wrapper is used to remove duplicates from the interface list generated
above */
int get_interfaces(struct iface_struct *ifaces, int max_interfaces)
{
int total, i, j;
total = _get_interfaces(ifaces, max_interfaces);
if (total <= 0) return total;
/* now we need to remove duplicates */
TYPESAFE_QSORT(ifaces, total, iface_comp);
for (i=1;i<total;) {
if (iface_comp(&ifaces[i-1], &ifaces[i]) == 0) {
for (j=i-1;j<total-1;j++) {
ifaces[j] = ifaces[j+1];
}
total--;
} else {
i++;
}
}
return total;
}
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