-/* Copyright (C) 1997, 1998, 1999, 2000, 2002, 2003, 2004, 2005
- Free Software Foundation, Inc.
+/* Copyright (C) 1997-2014 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
#include <alloca.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <bits/libc-lock.h>
#include <not-cancel.h>
+#include <kernel-features.h>
#include "netlinkaccess.h"
-/* Variable to signal whether SIOCGIFCONF is not available. */
-# if __ASSUME_SIOCGIFNAME == 0
-static int old_siocgifconf;
-#else
-# define old_siocgifconf 0
-#endif
-
-
unsigned int
if_nametoindex (const char *ifname)
{
libc_hidden_def (if_freenameindex)
-#if __ASSUME_NETLINK_SUPPORT == 0
-static struct if_nameindex *
-if_nameindex_ioctl (void)
-{
- int fd = __opensock ();
- struct ifconf ifc;
- unsigned int nifs, i;
- int rq_len;
- struct if_nameindex *idx = NULL;
-# define RQ_IFS 4
-
- if (fd < 0)
- return NULL;
-
- ifc.ifc_buf = NULL;
-
- /* We may be able to get the needed buffer size directly, rather than
- guessing. */
- if (! old_siocgifconf)
- {
- ifc.ifc_buf = NULL;
- ifc.ifc_len = 0;
- if (__ioctl (fd, SIOCGIFCONF, &ifc) < 0 || ifc.ifc_len == 0)
- {
-# if __ASSUME_SIOCGIFNAME == 0
- old_siocgifconf = 1;
-# endif
- rq_len = RQ_IFS * sizeof (struct ifreq);
- }
- else
- rq_len = ifc.ifc_len;
- }
- else
- rq_len = RQ_IFS * sizeof (struct ifreq);
-
- /* Read all the interfaces out of the kernel. */
- ifc.ifc_buf = alloca (rq_len);
- ifc.ifc_len = rq_len;
- while (1)
- {
- if (__ioctl (fd, SIOCGIFCONF, &ifc) < 0)
- {
- close_not_cancel_no_status (fd);
- return NULL;
- }
- if (ifc.ifc_len < rq_len || ! old_siocgifconf)
- break;
-
- ifc.ifc_buf = extend_alloca (ifc.ifc_buf, rq_len, 2 * rq_len);
- ifc.ifc_len = rq_len;
- }
-
- nifs = ifc.ifc_len / sizeof (struct ifreq);
-
- idx = malloc ((nifs + 1) * sizeof (struct if_nameindex));
- if (idx == NULL)
- {
- close_not_cancel_no_status (fd);
- __set_errno (ENOBUFS);
- return NULL;
- }
-
- for (i = 0; i < nifs; ++i)
- {
- struct ifreq *ifr = &ifc.ifc_req[i];
- idx[i].if_name = __strdup (ifr->ifr_name);
- if (idx[i].if_name == NULL
- || __ioctl (fd, SIOCGIFINDEX, ifr) < 0)
- {
- int saved_errno = errno;
- unsigned int j;
-
- for (j = 0; j < i; ++j)
- free (idx[j].if_name);
- free (idx);
- close_not_cancel_no_status (fd);
- if (saved_errno == EINVAL)
- saved_errno = ENOSYS;
- else if (saved_errno == ENOMEM)
- saved_errno = ENOBUFS;
- __set_errno (saved_errno);
- return NULL;
- }
- idx[i].if_index = ifr->ifr_ifindex;
- }
-
- idx[i].if_index = 0;
- idx[i].if_name = NULL;
-
- close_not_cancel_no_status (fd);
- return idx;
-}
-#endif
-
-
static struct if_nameindex *
if_nameindex_netlink (void)
{
struct netlink_handle nh = { 0, 0, 0, NULL, NULL };
struct if_nameindex *idx = NULL;
- if (__no_netlink_support || __netlink_open (&nh) < 0)
+ if (__netlink_open (&nh) < 0)
return NULL;
return NULL;
#else
struct if_nameindex *result = if_nameindex_netlink ();
-# if __ASSUME_NETLINK_SUPPORT == 0
- if (__no_netlink_support)
- result = if_nameindex_ioctl ();
-# endif
return result;
#endif
}
char *
if_indextoname (unsigned int ifindex, char *ifname)
{
-#if !defined SIOCGIFINDEX && __ASSUME_SIOCGIFNAME == 0
- __set_errno (ENOSYS);
- return NULL;
-#else
-# if __ASSUME_SIOCGIFNAME == 0
- struct if_nameindex *idx;
- struct if_nameindex *p;
- char *result = NULL;
-# endif
-
-# if defined SIOCGIFNAME || __ASSUME_SIOCGIFNAME > 0
/* We may be able to do the conversion directly, rather than searching a
list. This ioctl is not present in kernels before version 2.1.50. */
struct ifreq ifr;
int fd;
-# if __ASSUME_SIOCGIFNAME == 0
- static int siocgifname_works_not;
-
- if (!siocgifname_works_not)
-# endif
- {
-# if __ASSUME_SIOCGIFNAME == 0
- int serrno = errno;
-# endif
- int status;
-
- fd = __opensock ();
+ int status;
- if (fd < 0)
- return NULL;
-
- ifr.ifr_ifindex = ifindex;
- status = __ioctl (fd, SIOCGIFNAME, &ifr);
-
- close_not_cancel_no_status (fd);
-
- if (status < 0)
- {
-# if __ASSUME_SIOCGIFNAME == 0
- if (errno == EINVAL)
- siocgifname_works_not = 1; /* Don't make the same mistake twice. */
- else
-# endif
- {
- if (errno == ENODEV)
- /* POSIX requires ENXIO. */
- __set_errno (ENXIO);
+ fd = __opensock ();
- return NULL;
- }
- }
- else
- return strncpy (ifname, ifr.ifr_name, IFNAMSIZ);
+ if (fd < 0)
+ return NULL;
-# if __ASSUME_SIOCGIFNAME == 0
- __set_errno (serrno);
-# endif
- }
-# endif
+ ifr.ifr_ifindex = ifindex;
+ status = __ioctl (fd, SIOCGIFNAME, &ifr);
-# if __ASSUME_SIOCGIFNAME == 0
- idx = if_nameindex ();
+ close_not_cancel_no_status (fd);
- if (idx != NULL)
+ if (status < 0)
{
- for (p = idx; p->if_index || p->if_name; ++p)
- if (p->if_index == ifindex)
- {
- result = strncpy (ifname, p->if_name, IFNAMSIZ);
- break;
- }
-
- if_freenameindex (idx);
-
- if (result == NULL)
+ if (errno == ENODEV)
+ /* POSIX requires ENXIO. */
__set_errno (ENXIO);
- }
- return result;
-# endif
-#endif
-}
-libc_hidden_def (if_indextoname)
-
-
-#if 0
-void
-internal_function
-__protocol_available (int *have_inet, int *have_inet6)
-{
- int fd = __opensock ();
- unsigned int nifs;
- int rq_len;
- struct ifconf ifc;
-# define RQ_IFS 4
-
- /* Wirst case assumption. */
- *have_inet = 0;
- *have_inet6 = 0;
-
- if (fd < 0)
- /* We cannot open the socket. No networking at all? */
- return;
- /* We may be able to get the needed buffer size directly, rather than
- guessing. */
- if (! old_siocgifconf)
- {
- ifc.ifc_buf = NULL;
- ifc.ifc_len = 0;
- if (__ioctl (fd, SIOCGIFCONF, &ifc) < 0 || ifc.ifc_len == 0)
- {
-# if __ASSUME_SIOCGIFNAME == 0
- old_siocgifconf = 1;
-# endif
- rq_len = RQ_IFS * sizeof (struct ifreq);
- }
- else
- rq_len = ifc.ifc_len;
+ return NULL;
}
else
- rq_len = RQ_IFS * sizeof (struct ifreq);
-
- /* Read all the interfaces out of the kernel. */
- do
- {
- ifc.ifc_buf = alloca (ifc.ifc_len = rq_len);
- if (__ioctl (fd, SIOCGIFCONF, &ifc) < 0)
- {
- close_not_cancel_no_status (fd);
- return;
- }
- rq_len *= 2;
- }
- while (ifc.ifc_len == rq_len && old_siocgifconf);
-
- nifs = ifc.ifc_len / sizeof (struct ifreq);
-
- /* Go through all the interfaces and get the address. */
- while (nifs-- > 0)
- if (__ioctl (fd, SIOCGIFADDR, &ifc.ifc_req[nifs]) >= 0)
- {
- /* We successfully got information about this interface. Now
- test whether it is an IPv4 or IPv6 address. */
- if (ifc.ifc_req[nifs].ifr_addr.sa_family == AF_INET)
- *have_inet = 1;
- else if (ifc.ifc_req[nifs].ifr_addr.sa_family == AF_INET6)
- *have_inet6 = 1;
-
- /* Note, this is & not &&. It works since the values are always
- 0 or 1. */
- if (*have_inet & *have_inet6)
- /* We can stop early. */
- break;
- }
-
- close_not_cancel_no_status (fd);
+ return strncpy (ifname, ifr.ifr_name, IFNAMSIZ);
}
-#endif
+libc_hidden_def (if_indextoname)
projects / thirdparty / glibc.git / blobdiff