/*
* Copyright (c) 1996, 1998-2005, 2007-2011
* Todd C. Miller <Todd.Miller@courtesan.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Sponsored in part by the Defense Advanced Research Projects
* Agency (DARPA) and Air Force Research Laboratory, Air Force
* Materiel Command, USAF, under agreement number F39502-99-1-0512.
*/
#include <config.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#ifdef STDC_HEADERS
# include <stdlib.h>
# include <stddef.h>
#else
# ifdef HAVE_STDLIB_H
# include <stdlib.h>
# endif
#endif /* STDC_HEADERS */
#ifdef HAVE_STRING_H
# include <string.h>
#endif /* HAVE_STRING_H */
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif /* HAVE_STRINGS_H */
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif /* HAVE_UNISTD_H */
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include "sudoers.h"
#include "interfaces.h"
static int
addr_matches_if(char *n)
{
union sudo_in_addr_un addr;
struct interface *ifp;
#ifdef HAVE_IN6_ADDR
int j;
#endif
int family;
#ifdef HAVE_IN6_ADDR
if (inet_pton(AF_INET6, n, &addr.ip6) > 0) {
family = AF_INET6;
} else
#endif
{
family = AF_INET;
addr.ip4.s_addr = inet_addr(n);
}
for (ifp = interfaces; ifp != NULL; ifp = ifp->next) {
if (ifp->family != family)
continue;
switch(family) {
case AF_INET:
if (ifp->addr.ip4.s_addr == addr.ip4.s_addr ||
(ifp->addr.ip4.s_addr & ifp->netmask.ip4.s_addr)
== addr.ip4.s_addr)
return TRUE;
break;
#ifdef HAVE_IN6_ADDR
case AF_INET6:
if (memcmp(ifp->addr.ip6.s6_addr, addr.ip6.s6_addr,
sizeof(addr.ip6.s6_addr)) == 0)
return TRUE;
for (j = 0; j < sizeof(addr.ip6.s6_addr); j++) {
if ((ifp->addr.ip6.s6_addr[j] & ifp->netmask.ip6.s6_addr[j]) != addr.ip6.s6_addr[j])
break;
}
if (j == sizeof(addr.ip6.s6_addr))
return TRUE;
#endif
}
}
return FALSE;
}
static int
addr_matches_if_netmask(char *n, char *m)
{
int i;
union sudo_in_addr_un addr, mask;
struct interface *ifp;
#ifdef HAVE_IN6_ADDR
int j;
#endif
int family;
#ifdef HAVE_IN6_ADDR
if (inet_pton(AF_INET6, n, &addr.ip6) > 0)
family = AF_INET6;
else
#endif
{
family = AF_INET;
addr.ip4.s_addr = inet_addr(n);
}
if (family == AF_INET) {
if (strchr(m, '.')) {
mask.ip4.s_addr = inet_addr(m);
} else {
i = atoi(m);
if (i == 0)
mask.ip4.s_addr = 0;
else if (i == 32)
mask.ip4.s_addr = 0xffffffff;
else
mask.ip4.s_addr = 0xffffffff - (1 << (32 - i)) + 1;
mask.ip4.s_addr = htonl(mask.ip4.s_addr);
}
addr.ip4.s_addr &= mask.ip4.s_addr;
}
#ifdef HAVE_IN6_ADDR
else {
if (inet_pton(AF_INET6, m, &mask.ip6) <= 0) {
j = atoi(m);
for (i = 0; i < sizeof(addr.ip6.s6_addr); i++) {
if (j < i * 8)
mask.ip6.s6_addr[i] = 0;
else if (i * 8 + 8 <= j)
mask.ip6.s6_addr[i] = 0xff;
else
mask.ip6.s6_addr[i] = 0xff00 >> (j - i * 8);
addr.ip6.s6_addr[i] &= mask.ip6.s6_addr[i];
}
}
}
#endif /* HAVE_IN6_ADDR */
for (ifp = interfaces; ifp != NULL; ifp = ifp->next) {
if (ifp->family != family)
continue;
switch(family) {
case AF_INET:
if ((ifp->addr.ip4.s_addr & mask.ip4.s_addr) == addr.ip4.s_addr)
return TRUE;
#ifdef HAVE_IN6_ADDR
case AF_INET6:
for (j = 0; j < sizeof(addr.ip6.s6_addr); j++) {
if ((ifp->addr.ip6.s6_addr[j] & mask.ip6.s6_addr[j]) != addr.ip6.s6_addr[j])
break;
}
if (j == sizeof(addr.ip6.s6_addr))
return TRUE;
#endif /* HAVE_IN6_ADDR */
}
}
return FALSE;
}
/*
* Returns TRUE if "n" is one of our ip addresses or if
* "n" is a network that we are on, else returns FALSE.
*/
int
addr_matches(char *n)
{
char *m;
int retval;
/* If there's an explicit netmask, use it. */
if ((m = strchr(n, '/'))) {
*m++ = '\0';
retval = addr_matches_if_netmask(n, m);
*(m - 1) = '/';
} else
retval = addr_matches_if(n);
return retval;
}
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