-/* Copyright (C) 1997, 1998, 1999, 2000 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
- modify it under the terms of the GNU Library General Public License as
- published by the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
- Library General Public License for more details.
+ Lesser General Public License for more details.
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If not,
- write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+#include <alloca.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <bits/libc-lock.h>
+#include <not-cancel.h>
+#include <kernel-features.h>
-#include "kernel-features.h"
-
-/* Variable to signal whether SIOCGIFCONF is not available. */
-#if __ASSUME_SIOCGIFNAME == 0
-static int old_siocgifconf;
-#else
-# define old_siocgifconf 0
-#endif
+#include "netlinkaccess.h"
unsigned int
if (__ioctl (fd, SIOCGIFINDEX, &ifr) < 0)
{
int saved_errno = errno;
- __close (fd);
+ close_not_cancel_no_status (fd);
if (saved_errno == EINVAL)
__set_errno (ENOSYS);
return 0;
}
- __close (fd);
+ close_not_cancel_no_status (fd);
return ifr.ifr_ifindex;
#endif
}
+libc_hidden_def (if_nametoindex)
+
void
if_freenameindex (struct if_nameindex *ifn)
struct if_nameindex *ptr = ifn;
while (ptr->if_name || ptr->if_index)
{
- if (ptr->if_name)
- free (ptr->if_name);
+ free (ptr->if_name);
++ptr;
}
free (ifn);
}
+libc_hidden_def (if_freenameindex)
-struct if_nameindex *
-if_nameindex (void)
+
+static struct if_nameindex *
+if_nameindex_netlink (void)
{
-#ifndef SIOCGIFINDEX
- __set_errno (ENOSYS);
- return NULL;
-#else
- int fd = __opensock ();
- struct ifconf ifc;
- unsigned int nifs, i;
- int rq_len;
+ struct netlink_handle nh = { 0, 0, 0, NULL, NULL };
struct if_nameindex *idx = NULL;
-# define RQ_IFS 4
- if (fd < 0)
+ if (__netlink_open (&nh) < 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);
+ /* Tell the kernel that we wish to get a list of all
+ active interfaces. Collect all data for every interface. */
+ if (__netlink_request (&nh, RTM_GETLINK) < 0)
+ goto exit_free;
- /* Read all the interfaces out of the kernel. */
- do
+ /* Count the interfaces. */
+ unsigned int nifs = 0;
+ for (struct netlink_res *nlp = nh.nlm_list; nlp; nlp = nlp->next)
{
- ifc.ifc_buf = alloca (ifc.ifc_len = rq_len);
- if (ifc.ifc_buf == NULL || __ioctl (fd, SIOCGIFCONF, &ifc) < 0)
+ struct nlmsghdr *nlh;
+ size_t size = nlp->size;
+
+ if (nlp->nlh == NULL)
+ continue;
+
+ /* Walk through all entries we got from the kernel and look, which
+ message type they contain. */
+ for (nlh = nlp->nlh; NLMSG_OK (nlh, size); nlh = NLMSG_NEXT (nlh, size))
{
- __close (fd);
- return NULL;
+ /* Check if the message is what we want. */
+ if ((pid_t) nlh->nlmsg_pid != nh.pid || nlh->nlmsg_seq != nlp->seq)
+ continue;
+
+ if (nlh->nlmsg_type == NLMSG_DONE)
+ break; /* ok */
+
+ if (nlh->nlmsg_type == RTM_NEWLINK)
+ ++nifs;
}
- rq_len *= 2;
}
- while (ifc.ifc_len == rq_len && old_siocgifconf);
-
- nifs = ifc.ifc_len / sizeof (struct ifreq);
idx = malloc ((nifs + 1) * sizeof (struct if_nameindex));
if (idx == NULL)
{
- __close (fd);
+ nomem:
__set_errno (ENOBUFS);
- return NULL;
+ goto exit_free;
}
- for (i = 0; i < nifs; ++i)
+ /* Add the interfaces. */
+ nifs = 0;
+ for (struct netlink_res *nlp = nh.nlm_list; nlp; nlp = nlp->next)
{
- 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)
+ struct nlmsghdr *nlh;
+ size_t size = nlp->size;
+
+ if (nlp->nlh == NULL)
+ continue;
+
+ /* Walk through all entries we got from the kernel and look, which
+ message type they contain. */
+ for (nlh = nlp->nlh; NLMSG_OK (nlh, size); nlh = NLMSG_NEXT (nlh, size))
{
- int saved_errno = errno;
- unsigned int j;
-
- for (j = 0; j < i; ++j)
- free (idx[j].if_name);
- free (idx);
- __close (fd);
- if (saved_errno == EINVAL)
- saved_errno = ENOSYS;
- else if (saved_errno == ENOMEM)
- saved_errno = ENOBUFS;
- __set_errno (saved_errno);
- return NULL;
+ /* Check if the message is what we want. */
+ if ((pid_t) nlh->nlmsg_pid != nh.pid || nlh->nlmsg_seq != nlp->seq)
+ continue;
+
+ if (nlh->nlmsg_type == NLMSG_DONE)
+ break; /* ok */
+
+ if (nlh->nlmsg_type == RTM_NEWLINK)
+ {
+ struct ifinfomsg *ifim = (struct ifinfomsg *) NLMSG_DATA (nlh);
+ struct rtattr *rta = IFLA_RTA (ifim);
+ size_t rtasize = IFLA_PAYLOAD (nlh);
+
+ idx[nifs].if_index = ifim->ifi_index;
+
+ while (RTA_OK (rta, rtasize))
+ {
+ char *rta_data = RTA_DATA (rta);
+ size_t rta_payload = RTA_PAYLOAD (rta);
+
+ if (rta->rta_type == IFLA_IFNAME)
+ {
+ idx[nifs].if_name = __strndup (rta_data, rta_payload);
+ if (idx[nifs].if_name == NULL)
+ {
+ idx[nifs].if_index = 0;
+ if_freenameindex (idx);
+ idx = NULL;
+ goto nomem;
+ }
+ break;
+ }
+
+ rta = RTA_NEXT (rta, rtasize);
+ }
+
+ ++nifs;
+ }
}
- idx[i].if_index = ifr->ifr_ifindex;
}
- idx[i].if_index = 0;
- idx[i].if_name = NULL;
+ idx[nifs].if_index = 0;
+ idx[nifs].if_name = NULL;
+
+ exit_free:
+ __netlink_free_handle (&nh);
+ __netlink_close (&nh);
- __close (fd);
return idx;
-#endif
}
-char *
-if_indextoname (unsigned int ifindex, char *ifname)
+
+struct if_nameindex *
+if_nameindex (void)
{
-#if !defined SIOCGIFINDEX && __ASSUME_SIOCGIFNAME == 0
+#ifndef SIOCGIFINDEX
__set_errno (ENOSYS);
return NULL;
#else
-# if __ASSUME_SIOCGIFNAME == 0
- struct if_nameindex *idx;
- struct if_nameindex *p;
- char *result = NULL;
-# endif
+ struct if_nameindex *result = if_nameindex_netlink ();
+ return result;
+#endif
+}
+libc_hidden_def (if_nameindex)
+
-# if defined SIOCGIFNAME || __ASSUME_SIOCGIFNAME > 0
+char *
+if_indextoname (unsigned int ifindex, char *ifname)
+{
/* 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 ();
-
- if (fd < 0)
- return NULL;
+ int status;
- ifr.ifr_ifindex = ifindex;
- status = __ioctl (fd, SIOCGIFNAME, &ifr);
+ fd = __opensock ();
- __close (fd);
+ if (fd < 0)
+ return NULL;
-# if __ASSUME_SIOCGIFNAME == 0
- if (status < 0)
- {
- if (errno == EINVAL)
- siocgifname_works_not = 1; /* Don't make the same mistake twice. */
- }
- else
- return strncpy (ifname, ifr.ifr_name, IFNAMSIZ);
+ ifr.ifr_ifindex = ifindex;
+ status = __ioctl (fd, SIOCGIFNAME, &ifr);
- __set_errno (serrno);
-# else
- return status < 0 ? NULL : strncpy (ifname, ifr.ifr_name, IFNAMSIZ);
-# endif
- }
-# endif
+ close_not_cancel_no_status (fd);
-# if __ASSUME_SIOCGIFNAME == 0
- idx = if_nameindex ();
-
- 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);
- }
- return result;
-# endif
-#endif
-}
-
-#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
+ if (errno == ENODEV)
+ /* POSIX requires ENXIO. */
+ __set_errno (ENXIO);
- /* 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 (ifc.ifc_buf == NULL || __ioctl (fd, SIOCGIFCONF, &ifc) < 0)
- {
- __close (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 (fd);
+ return strncpy (ifname, ifr.ifr_name, IFNAMSIZ);
}
-#endif
+libc_hidden_def (if_indextoname)
projects / thirdparty / glibc.git / blobdiff