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Diffstat (limited to 'sysdeps/unix/sysv/linux/check_pf.c')
-rw-r--r--sysdeps/unix/sysv/linux/check_pf.c391
1 files changed, 0 insertions, 391 deletions
diff --git a/sysdeps/unix/sysv/linux/check_pf.c b/sysdeps/unix/sysv/linux/check_pf.c
deleted file mode 100644
index 3bf221a177..0000000000
--- a/sysdeps/unix/sysv/linux/check_pf.c
+++ /dev/null
@@ -1,391 +0,0 @@
-/* Determine protocol families for which interfaces exist. Linux version.
- Copyright (C) 2003-2017 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 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
- 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, see
- <http://www.gnu.org/licenses/>. */
-
-#include <assert.h>
-#include <errno.h>
-#include <ifaddrs.h>
-#include <netdb.h>
-#include <stddef.h>
-#include <string.h>
-#include <time.h>
-#include <unistd.h>
-#include <stdint.h>
-#include <sys/socket.h>
-
-#include <asm/types.h>
-#include <linux/netlink.h>
-#include <linux/rtnetlink.h>
-
-#include <not-cancel.h>
-#include <libc-lock.h>
-#include <atomic.h>
-#include <nscd/nscd-client.h>
-
-#include "netlinkaccess.h"
-
-#ifndef IFA_F_HOMEADDRESS
-# define IFA_F_HOMEADDRESS 0
-#endif
-#ifndef IFA_F_OPTIMISTIC
-# define IFA_F_OPTIMISTIC 0
-#endif
-
-
-struct cached_data
-{
- uint32_t timestamp;
- uint32_t usecnt;
- bool seen_ipv4;
- bool seen_ipv6;
- size_t in6ailen;
- struct in6addrinfo in6ai[0];
-};
-
-static struct cached_data noai6ai_cached =
- {
- .usecnt = 1, /* Make sure we never try to delete this entry. */
- .in6ailen = 0
- };
-
-static struct cached_data *cache;
-__libc_lock_define_initialized (static, lock);
-
-
-#if IS_IN (nscd)
-static uint32_t nl_timestamp;
-
-uint32_t
-__bump_nl_timestamp (void)
-{
- if (atomic_increment_val (&nl_timestamp) == 0)
- atomic_increment (&nl_timestamp);
-
- return nl_timestamp;
-}
-#endif
-
-static inline uint32_t
-get_nl_timestamp (void)
-{
-#if IS_IN (nscd)
- return nl_timestamp;
-#elif defined USE_NSCD
- return __nscd_get_nl_timestamp ();
-#else
- return 0;
-#endif
-}
-
-static inline bool
-cache_valid_p (void)
-{
- if (cache != NULL)
- {
- uint32_t timestamp = get_nl_timestamp ();
- return timestamp != 0 && cache->timestamp == timestamp;
- }
- return false;
-}
-
-
-static struct cached_data *
-make_request (int fd, pid_t pid)
-{
- struct cached_data *result = NULL;
-
- size_t result_len = 0;
- size_t result_cap = 32;
-
- struct req
- {
- struct nlmsghdr nlh;
- struct rtgenmsg g;
- /* struct rtgenmsg consists of a single byte. This means there
- are three bytes of padding included in the REQ definition.
- We make them explicit here. */
- char pad[3];
- } req;
- struct sockaddr_nl nladdr;
-
- req.nlh.nlmsg_len = sizeof (req);
- req.nlh.nlmsg_type = RTM_GETADDR;
- req.nlh.nlmsg_flags = NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST;
- req.nlh.nlmsg_pid = 0;
- req.nlh.nlmsg_seq = time (NULL);
- req.g.rtgen_family = AF_UNSPEC;
-
- assert (sizeof (req) - offsetof (struct req, pad) == 3);
- memset (req.pad, '\0', sizeof (req.pad));
-
- memset (&nladdr, '\0', sizeof (nladdr));
- nladdr.nl_family = AF_NETLINK;
-
-#ifdef PAGE_SIZE
- const size_t buf_size = PAGE_SIZE;
-#else
- const size_t buf_size = 4096;
-#endif
- char buf[buf_size];
-
- struct iovec iov = { buf, buf_size };
-
- if (TEMP_FAILURE_RETRY (__sendto (fd, (void *) &req, sizeof (req), 0,
- (struct sockaddr *) &nladdr,
- sizeof (nladdr))) < 0)
- goto out_fail;
-
- bool done = false;
-
- bool seen_ipv4 = false;
- bool seen_ipv6 = false;
-
- do
- {
- struct msghdr msg =
- {
- .msg_name = (void *) &nladdr,
- .msg_namelen = sizeof (nladdr),
- .msg_iov = &iov,
- .msg_iovlen = 1,
- .msg_control = NULL,
- .msg_controllen = 0,
- .msg_flags = 0
- };
-
- ssize_t read_len = TEMP_FAILURE_RETRY (__recvmsg (fd, &msg, 0));
- __netlink_assert_response (fd, read_len);
- if (read_len < 0)
- goto out_fail;
-
- if (msg.msg_flags & MSG_TRUNC)
- goto out_fail;
-
- struct nlmsghdr *nlmh;
- for (nlmh = (struct nlmsghdr *) buf;
- NLMSG_OK (nlmh, (size_t) read_len);
- nlmh = (struct nlmsghdr *) NLMSG_NEXT (nlmh, read_len))
- {
- if (nladdr.nl_pid != 0 || (pid_t) nlmh->nlmsg_pid != pid
- || nlmh->nlmsg_seq != req.nlh.nlmsg_seq)
- continue;
-
- if (nlmh->nlmsg_type == RTM_NEWADDR)
- {
- struct ifaddrmsg *ifam = (struct ifaddrmsg *) NLMSG_DATA (nlmh);
- struct rtattr *rta = IFA_RTA (ifam);
- size_t len = nlmh->nlmsg_len - NLMSG_LENGTH (sizeof (*ifam));
-
- if (ifam->ifa_family != AF_INET
- && ifam->ifa_family != AF_INET6)
- continue;
-
- const void *local = NULL;
- const void *address = NULL;
- while (RTA_OK (rta, len))
- {
- switch (rta->rta_type)
- {
- case IFA_LOCAL:
- local = RTA_DATA (rta);
- break;
-
- case IFA_ADDRESS:
- address = RTA_DATA (rta);
- goto out;
- }
-
- rta = RTA_NEXT (rta, len);
- }
-
- if (local != NULL)
- {
- address = local;
- out:
- if (ifam->ifa_family == AF_INET)
- {
- if (*(const in_addr_t *) address
- != htonl (INADDR_LOOPBACK))
- seen_ipv4 = true;
- }
- else
- {
- if (!IN6_IS_ADDR_LOOPBACK (address))
- seen_ipv6 = true;
- }
- }
-
- if (result_len == 0 || result_len == result_cap)
- {
- result_cap = 2 * result_cap;
- result = realloc (result, sizeof (*result)
- + result_cap
- * sizeof (struct in6addrinfo));
- }
-
- if (!result)
- goto out_fail;
-
- struct in6addrinfo *info = &result->in6ai[result_len++];
-
- info->flags = (((ifam->ifa_flags
- & (IFA_F_DEPRECATED | IFA_F_OPTIMISTIC))
- ? in6ai_deprecated : 0)
- | ((ifam->ifa_flags & IFA_F_HOMEADDRESS)
- ? in6ai_homeaddress : 0));
- info->prefixlen = ifam->ifa_prefixlen;
- info->index = ifam->ifa_index;
- if (ifam->ifa_family == AF_INET)
- {
- info->addr[0] = 0;
- info->addr[1] = 0;
- info->addr[2] = htonl (0xffff);
- info->addr[3] = *(const in_addr_t *) address;
- }
- else
- memcpy (info->addr, address, sizeof (info->addr));
- }
- else if (nlmh->nlmsg_type == NLMSG_DONE)
- /* We found the end, leave the loop. */
- done = true;
- }
- }
- while (! done);
-
- if (seen_ipv6 && result != NULL)
- {
- result->timestamp = get_nl_timestamp ();
- result->usecnt = 2;
- result->seen_ipv4 = seen_ipv4;
- result->seen_ipv6 = true;
- result->in6ailen = result_len;
- }
- else
- {
- free (result);
-
- atomic_add (&noai6ai_cached.usecnt, 2);
- noai6ai_cached.seen_ipv4 = seen_ipv4;
- noai6ai_cached.seen_ipv6 = seen_ipv6;
- result = &noai6ai_cached;
- }
-
- return result;
-
- out_fail:
-
- free (result);
- return NULL;
-}
-
-
-void
-attribute_hidden
-__check_pf (bool *seen_ipv4, bool *seen_ipv6,
- struct in6addrinfo **in6ai, size_t *in6ailen)
-{
- *in6ai = NULL;
- *in6ailen = 0;
-
- struct cached_data *olddata = NULL;
- struct cached_data *data = NULL;
-
- __libc_lock_lock (lock);
-
- if (cache_valid_p ())
- {
- data = cache;
- atomic_increment (&cache->usecnt);
- }
- else
- {
- int fd = __socket (PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
-
- if (__glibc_likely (fd >= 0))
- {
- struct sockaddr_nl nladdr;
- memset (&nladdr, '\0', sizeof (nladdr));
- nladdr.nl_family = AF_NETLINK;
-
- socklen_t addr_len = sizeof (nladdr);
-
- if (__bind (fd, (struct sockaddr *) &nladdr, sizeof (nladdr)) == 0
- && __getsockname (fd, (struct sockaddr *) &nladdr,
- &addr_len) == 0)
- data = make_request (fd, nladdr.nl_pid);
-
- close_not_cancel_no_status (fd);
- }
-
- if (data != NULL)
- {
- olddata = cache;
- cache = data;
- }
- }
-
- __libc_lock_unlock (lock);
-
- if (data != NULL)
- {
- /* It worked. */
- *seen_ipv4 = data->seen_ipv4;
- *seen_ipv6 = data->seen_ipv6;
- *in6ailen = data->in6ailen;
- *in6ai = data->in6ai;
-
- if (olddata != NULL && olddata->usecnt > 0
- && atomic_add_zero (&olddata->usecnt, -1))
- free (olddata);
-
- return;
- }
-
- /* We cannot determine what interfaces are available. Be
- pessimistic. */
- *seen_ipv4 = true;
- *seen_ipv6 = true;
-}
-
-/* Free the cache if it has been allocated. */
-libc_freeres_fn (freecache)
-{
- if (cache)
- __free_in6ai (cache->in6ai);
-}
-
-void
-__free_in6ai (struct in6addrinfo *ai)
-{
- if (ai != NULL)
- {
- struct cached_data *data =
- (struct cached_data *) ((char *) ai
- - offsetof (struct cached_data, in6ai));
-
- if (atomic_add_zero (&data->usecnt, -1))
- {
- __libc_lock_lock (lock);
-
- if (data->usecnt == 0)
- /* Still unused. */
- free (data);
-
- __libc_lock_unlock (lock);
- }
- }
-}
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