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6c4009 |
/* Determine protocol families for which interfaces exist. Linux version.
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6c4009 |
Copyright (C) 2003-2018 Free Software Foundation, Inc.
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6c4009 |
This file is part of the GNU C Library.
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6c4009 |
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6c4009 |
The GNU C Library is free software; you can redistribute it and/or
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6c4009 |
modify it under the terms of the GNU Lesser General Public
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6c4009 |
License as published by the Free Software Foundation; either
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6c4009 |
version 2.1 of the License, or (at your option) any later version.
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6c4009 |
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6c4009 |
The GNU C Library is distributed in the hope that it will be useful,
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6c4009 |
but WITHOUT ANY WARRANTY; without even the implied warranty of
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6c4009 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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6c4009 |
Lesser General Public License for more details.
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6c4009 |
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6c4009 |
You should have received a copy of the GNU Lesser General Public
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6c4009 |
License along with the GNU C Library; if not, see
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6c4009 |
<http://www.gnu.org/licenses/>. */
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6c4009 |
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6c4009 |
#include <assert.h>
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6c4009 |
#include <errno.h>
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6c4009 |
#include <ifaddrs.h>
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6c4009 |
#include <netdb.h>
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6c4009 |
#include <stddef.h>
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6c4009 |
#include <string.h>
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6c4009 |
#include <time.h>
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6c4009 |
#include <unistd.h>
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6c4009 |
#include <stdint.h>
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6c4009 |
#include <sys/socket.h>
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6c4009 |
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6c4009 |
#include <asm/types.h>
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6c4009 |
#include <linux/netlink.h>
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6c4009 |
#include <linux/rtnetlink.h>
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6c4009 |
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6c4009 |
#include <not-cancel.h>
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6c4009 |
#include <libc-lock.h>
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6c4009 |
#include <atomic.h>
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6c4009 |
#include <nscd/nscd-client.h>
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6c4009 |
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6c4009 |
#include "netlinkaccess.h"
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6c4009 |
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6c4009 |
#ifndef IFA_F_HOMEADDRESS
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6c4009 |
# define IFA_F_HOMEADDRESS 0
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6c4009 |
#endif
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6c4009 |
#ifndef IFA_F_OPTIMISTIC
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6c4009 |
# define IFA_F_OPTIMISTIC 0
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6c4009 |
#endif
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6c4009 |
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6c4009 |
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6c4009 |
struct cached_data
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6c4009 |
{
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6c4009 |
uint32_t timestamp;
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6c4009 |
uint32_t usecnt;
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6c4009 |
bool seen_ipv4;
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6c4009 |
bool seen_ipv6;
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6c4009 |
size_t in6ailen;
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6c4009 |
struct in6addrinfo in6ai[0];
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6c4009 |
};
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6c4009 |
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6c4009 |
static struct cached_data noai6ai_cached =
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6c4009 |
{
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6c4009 |
.usecnt = 1, /* Make sure we never try to delete this entry. */
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6c4009 |
.in6ailen = 0
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6c4009 |
};
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6c4009 |
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6c4009 |
static struct cached_data *cache;
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6c4009 |
__libc_lock_define_initialized (static, lock);
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6c4009 |
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6c4009 |
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6c4009 |
#if IS_IN (nscd)
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6c4009 |
static uint32_t nl_timestamp;
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6c4009 |
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6c4009 |
uint32_t
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6c4009 |
__bump_nl_timestamp (void)
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6c4009 |
{
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6c4009 |
if (atomic_increment_val (&nl_timestamp) == 0)
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6c4009 |
atomic_increment (&nl_timestamp);
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6c4009 |
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6c4009 |
return nl_timestamp;
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6c4009 |
}
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6c4009 |
#endif
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6c4009 |
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6c4009 |
static inline uint32_t
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6c4009 |
get_nl_timestamp (void)
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6c4009 |
{
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6c4009 |
#if IS_IN (nscd)
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6c4009 |
return nl_timestamp;
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6c4009 |
#elif defined USE_NSCD
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6c4009 |
return __nscd_get_nl_timestamp ();
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6c4009 |
#else
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6c4009 |
return 0;
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6c4009 |
#endif
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6c4009 |
}
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6c4009 |
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6c4009 |
static inline bool
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6c4009 |
cache_valid_p (void)
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6c4009 |
{
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6c4009 |
if (cache != NULL)
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6c4009 |
{
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6c4009 |
uint32_t timestamp = get_nl_timestamp ();
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6c4009 |
return timestamp != 0 && cache->timestamp == timestamp;
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6c4009 |
}
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6c4009 |
return false;
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6c4009 |
}
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6c4009 |
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6c4009 |
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6c4009 |
static struct cached_data *
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6c4009 |
make_request (int fd, pid_t pid)
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6c4009 |
{
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6c4009 |
struct cached_data *result = NULL;
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6c4009 |
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6c4009 |
size_t result_len = 0;
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6c4009 |
size_t result_cap = 32;
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6c4009 |
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6c4009 |
struct req
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6c4009 |
{
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6c4009 |
struct nlmsghdr nlh;
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6c4009 |
struct rtgenmsg g;
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6c4009 |
/* struct rtgenmsg consists of a single byte. This means there
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6c4009 |
are three bytes of padding included in the REQ definition.
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6c4009 |
We make them explicit here. */
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6c4009 |
char pad[3];
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6c4009 |
} req;
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6c4009 |
struct sockaddr_nl nladdr;
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6c4009 |
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6c4009 |
req.nlh.nlmsg_len = sizeof (req);
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6c4009 |
req.nlh.nlmsg_type = RTM_GETADDR;
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6c4009 |
req.nlh.nlmsg_flags = NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST;
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6c4009 |
req.nlh.nlmsg_pid = 0;
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6c4009 |
req.nlh.nlmsg_seq = time (NULL);
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6c4009 |
req.g.rtgen_family = AF_UNSPEC;
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6c4009 |
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6c4009 |
assert (sizeof (req) - offsetof (struct req, pad) == 3);
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6c4009 |
memset (req.pad, '\0', sizeof (req.pad));
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6c4009 |
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6c4009 |
memset (&nladdr, '\0', sizeof (nladdr));
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6c4009 |
nladdr.nl_family = AF_NETLINK;
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6c4009 |
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6c4009 |
#ifdef PAGE_SIZE
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6c4009 |
const size_t buf_size = PAGE_SIZE;
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6c4009 |
#else
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6c4009 |
const size_t buf_size = 4096;
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6c4009 |
#endif
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6c4009 |
char buf[buf_size];
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6c4009 |
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6c4009 |
struct iovec iov = { buf, buf_size };
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6c4009 |
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6c4009 |
if (TEMP_FAILURE_RETRY (__sendto (fd, (void *) &req, sizeof (req), 0,
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6c4009 |
(struct sockaddr *) &nladdr,
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6c4009 |
sizeof (nladdr))) < 0)
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6c4009 |
goto out_fail;
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6c4009 |
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6c4009 |
bool done = false;
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6c4009 |
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6c4009 |
bool seen_ipv4 = false;
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6c4009 |
bool seen_ipv6 = false;
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6c4009 |
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6c4009 |
do
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6c4009 |
{
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6c4009 |
struct msghdr msg =
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6c4009 |
{
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6c4009 |
.msg_name = (void *) &nladdr,
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6c4009 |
.msg_namelen = sizeof (nladdr),
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6c4009 |
.msg_iov = &iov,
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6c4009 |
.msg_iovlen = 1,
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6c4009 |
.msg_control = NULL,
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Packit |
6c4009 |
.msg_controllen = 0,
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|
Packit |
6c4009 |
.msg_flags = 0
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|
Packit |
6c4009 |
};
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Packit |
6c4009 |
|
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6c4009 |
ssize_t read_len = TEMP_FAILURE_RETRY (__recvmsg (fd, &msg, 0));
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|
Packit |
6c4009 |
__netlink_assert_response (fd, read_len);
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|
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6c4009 |
if (read_len < 0)
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Packit |
6c4009 |
goto out_fail;
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Packit |
6c4009 |
|
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Packit |
6c4009 |
if (msg.msg_flags & MSG_TRUNC)
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|
Packit |
6c4009 |
goto out_fail;
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|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
struct nlmsghdr *nlmh;
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|
Packit |
6c4009 |
for (nlmh = (struct nlmsghdr *) buf;
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|
Packit |
6c4009 |
NLMSG_OK (nlmh, (size_t) read_len);
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|
Packit |
6c4009 |
nlmh = (struct nlmsghdr *) NLMSG_NEXT (nlmh, read_len))
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
if (nladdr.nl_pid != 0 || (pid_t) nlmh->nlmsg_pid != pid
|
|
Packit |
6c4009 |
|| nlmh->nlmsg_seq != req.nlh.nlmsg_seq)
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|
Packit |
6c4009 |
continue;
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|
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6c4009 |
|
|
Packit |
6c4009 |
if (nlmh->nlmsg_type == RTM_NEWADDR)
|
|
Packit |
6c4009 |
{
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|
Packit |
6c4009 |
struct ifaddrmsg *ifam = (struct ifaddrmsg *) NLMSG_DATA (nlmh);
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|
Packit |
6c4009 |
struct rtattr *rta = IFA_RTA (ifam);
|
|
Packit |
6c4009 |
size_t len = nlmh->nlmsg_len - NLMSG_LENGTH (sizeof (*ifam));
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (ifam->ifa_family != AF_INET
|
|
Packit |
6c4009 |
&& ifam->ifa_family != AF_INET6)
|
|
Packit |
6c4009 |
continue;
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|
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6c4009 |
|
|
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6c4009 |
const void *local = NULL;
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|
Packit |
6c4009 |
const void *address = NULL;
|
|
Packit |
6c4009 |
while (RTA_OK (rta, len))
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
switch (rta->rta_type)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
case IFA_LOCAL:
|
|
Packit |
6c4009 |
local = RTA_DATA (rta);
|
|
Packit |
6c4009 |
break;
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|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
case IFA_ADDRESS:
|
|
Packit |
6c4009 |
address = RTA_DATA (rta);
|
|
Packit |
6c4009 |
goto out;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
rta = RTA_NEXT (rta, len);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (local != NULL)
|
|
Packit |
6c4009 |
{
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|
Packit |
6c4009 |
address = local;
|
|
Packit |
6c4009 |
out:
|
|
Packit |
6c4009 |
if (ifam->ifa_family == AF_INET)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
if (*(const in_addr_t *) address
|
|
Packit |
6c4009 |
!= htonl (INADDR_LOOPBACK))
|
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Packit |
6c4009 |
seen_ipv4 = true;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
else
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
if (!IN6_IS_ADDR_LOOPBACK (address))
|
|
Packit |
6c4009 |
seen_ipv6 = true;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (result_len == 0 || result_len == result_cap)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
result_cap = 2 * result_cap;
|
|
Packit |
6c4009 |
result = realloc (result, sizeof (*result)
|
|
Packit |
6c4009 |
+ result_cap
|
|
Packit |
6c4009 |
* sizeof (struct in6addrinfo));
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (!result)
|
|
Packit |
6c4009 |
goto out_fail;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
struct in6addrinfo *info = &result->in6ai[result_len++];
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
info->flags = (((ifam->ifa_flags
|
|
Packit |
6c4009 |
& (IFA_F_DEPRECATED | IFA_F_OPTIMISTIC))
|
|
Packit |
6c4009 |
? in6ai_deprecated : 0)
|
|
Packit |
6c4009 |
| ((ifam->ifa_flags & IFA_F_HOMEADDRESS)
|
|
Packit |
6c4009 |
? in6ai_homeaddress : 0));
|
|
Packit |
6c4009 |
info->prefixlen = ifam->ifa_prefixlen;
|
|
Packit |
6c4009 |
info->index = ifam->ifa_index;
|
|
Packit |
6c4009 |
if (ifam->ifa_family == AF_INET)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
info->addr[0] = 0;
|
|
Packit |
6c4009 |
info->addr[1] = 0;
|
|
Packit |
6c4009 |
info->addr[2] = htonl (0xffff);
|
|
Packit |
6c4009 |
info->addr[3] = *(const in_addr_t *) address;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
else
|
|
Packit |
6c4009 |
memcpy (info->addr, address, sizeof (info->addr));
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
else if (nlmh->nlmsg_type == NLMSG_DONE)
|
|
Packit |
6c4009 |
/* We found the end, leave the loop. */
|
|
Packit |
6c4009 |
done = true;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
while (! done);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (seen_ipv6 && result != NULL)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
result->timestamp = get_nl_timestamp ();
|
|
Packit |
6c4009 |
result->usecnt = 2;
|
|
Packit |
6c4009 |
result->seen_ipv4 = seen_ipv4;
|
|
Packit |
6c4009 |
result->seen_ipv6 = true;
|
|
Packit |
6c4009 |
result->in6ailen = result_len;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
else
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
free (result);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
atomic_add (&noai6ai_cached.usecnt, 2);
|
|
Packit |
6c4009 |
noai6ai_cached.seen_ipv4 = seen_ipv4;
|
|
Packit |
6c4009 |
noai6ai_cached.seen_ipv6 = seen_ipv6;
|
|
Packit |
6c4009 |
result = &noai6ai_cached;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
return result;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
out_fail:
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
free (result);
|
|
Packit |
6c4009 |
return NULL;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
void
|
|
Packit |
6c4009 |
attribute_hidden
|
|
Packit |
6c4009 |
__check_pf (bool *seen_ipv4, bool *seen_ipv6,
|
|
Packit |
6c4009 |
struct in6addrinfo **in6ai, size_t *in6ailen)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
*in6ai = NULL;
|
|
Packit |
6c4009 |
*in6ailen = 0;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
struct cached_data *olddata = NULL;
|
|
Packit |
6c4009 |
struct cached_data *data = NULL;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
__libc_lock_lock (lock);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (cache_valid_p ())
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
data = cache;
|
|
Packit |
6c4009 |
atomic_increment (&cache->usecnt);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
else
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
int fd = __socket (PF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, NETLINK_ROUTE);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (__glibc_likely (fd >= 0))
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
struct sockaddr_nl nladdr;
|
|
Packit |
6c4009 |
memset (&nladdr, '\0', sizeof (nladdr));
|
|
Packit |
6c4009 |
nladdr.nl_family = AF_NETLINK;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
socklen_t addr_len = sizeof (nladdr);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (__bind (fd, (struct sockaddr *) &nladdr, sizeof (nladdr)) == 0
|
|
Packit |
6c4009 |
&& __getsockname (fd, (struct sockaddr *) &nladdr,
|
|
Packit |
6c4009 |
&addr_len) == 0)
|
|
Packit |
6c4009 |
data = make_request (fd, nladdr.nl_pid);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
__close_nocancel_nostatus (fd);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (data != NULL)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
olddata = cache;
|
|
Packit |
6c4009 |
cache = data;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
__libc_lock_unlock (lock);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (data != NULL)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
/* It worked. */
|
|
Packit |
6c4009 |
*seen_ipv4 = data->seen_ipv4;
|
|
Packit |
6c4009 |
*seen_ipv6 = data->seen_ipv6;
|
|
Packit |
6c4009 |
*in6ailen = data->in6ailen;
|
|
Packit |
6c4009 |
*in6ai = data->in6ai;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (olddata != NULL && olddata->usecnt > 0
|
|
Packit |
6c4009 |
&& atomic_add_zero (&olddata->usecnt, -1))
|
|
Packit |
6c4009 |
free (olddata);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
return;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* We cannot determine what interfaces are available. Be
|
|
Packit |
6c4009 |
pessimistic. */
|
|
Packit |
6c4009 |
*seen_ipv4 = true;
|
|
Packit |
6c4009 |
*seen_ipv6 = true;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Free the cache if it has been allocated. */
|
|
Packit |
6c4009 |
libc_freeres_fn (freecache)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
if (cache)
|
|
Packit |
6c4009 |
__free_in6ai (cache->in6ai);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
void
|
|
Packit |
6c4009 |
__free_in6ai (struct in6addrinfo *ai)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
if (ai != NULL)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
struct cached_data *data =
|
|
Packit |
6c4009 |
(struct cached_data *) ((char *) ai
|
|
Packit |
6c4009 |
- offsetof (struct cached_data, in6ai));
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (atomic_add_zero (&data->usecnt, -1))
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
__libc_lock_lock (lock);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (data->usecnt == 0)
|
|
Packit |
6c4009 |
/* Still unused. */
|
|
Packit |
6c4009 |
free (data);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
__libc_lock_unlock (lock);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
}
|