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* inet/Makefile (aux): Add check_fd.
	* include/ifaddrs.h: Add prototype for __check_fd.
	* sysdeps/generic/check_fd.c: New file.
	* sysdeps/unix/sysv/linux/check_fd.c: New file.
	* sysdeps/unix/sysv/linux/ifaddrs.h (__no_netlink_support): Renamed
	from no_netlink_support.  Export.
	* sysdeps/posix/getaddrinfo.c (getaddrinfo): Don't call getifaddrs,
	call __check_pf.

	* sysdeps/generic/ifaddrs.h: Add libc_hidden_def.
This commit is contained in:
Ulrich Drepper 2003-06-10 08:58:05 +00:00
parent 06120d793a
commit 1dc869d13c
8 changed files with 272 additions and 33 deletions
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11
ChangeLog
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@ -1,5 +1,16 @@
2003-06-10 Ulrich Drepper <drepper@redhat.com>
* inet/Makefile (aux): Add check_fd.
* include/ifaddrs.h: Add prototype for __check_fd.
* sysdeps/generic/check_fd.c: New file.
* sysdeps/unix/sysv/linux/check_fd.c: New file.
* sysdeps/unix/sysv/linux/ifaddrs.h (__no_netlink_support): Renamed
from no_netlink_support. Export.
* sysdeps/posix/getaddrinfo.c (getaddrinfo): Don't call getifaddrs,
call __check_pf.
* sysdeps/generic/ifaddrs.h: Add libc_hidden_def.
* sysdeps/posix/getaddrinfo.c (getaddrinfo): Don't leak memory
from getifaddr calls.

3
include/ifaddrs.h
View File

@ -1,7 +1,10 @@
#ifndef _IFADDRS_H
#include <inet/ifaddrs.h>
#include <stdbool.h>
libc_hidden_proto (getifaddrs)
libc_hidden_proto (freeifaddrs)
extern void __check_pf (bool *seen_ipv4, bool *seen_ipv6) attribute_hidden;
#endif /* ifaddrs.h */

4
inet/Makefile
View File

@ -1,4 +1,4 @@
# Copyright (C) 1991-1999,2000,01,02 Free Software Foundation, Inc.
# Copyright (C) 1991-2002, 2003 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
@ -47,6 +47,8 @@ routines := htonl htons \
getaliasent_r getaliasent getaliasname getaliasname_r \
in6_addr getnameinfo if_index ifaddrs
aux := check_pf
tests := htontest test_ifindex tst-ntoa tst-ether_aton tst-network \
tst-gethnm test-ifaddrs

50
sysdeps/generic/check_pf.c Normal file
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@ -0,0 +1,50 @@
/* Determine protocol families for which interfaces exist. Generic version.
Copyright (C) 2003 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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <ifaddrs.h>
#include <netdb.h>
void
attribute_hidden
__check_pf (bool *seen_ipv4, bool *seen_ipv6)
{
/* Get the interface list via getifaddrs. */
struct ifaddrs *ifa = NULL;
if (getifaddrs (&ifa) != 0)
{
/* We cannot determine what interfaces are available. Be
pessimistic. */
*seen_ipv4 = true;
*seen_ipv6 = true;
return;
}
*seen_ipv4 = false;
*seen_ipv6 = false;
struct ifaddrs *runp;
for (runp = ifa; runp != NULL; runp = runp->ifa_next)
if (runp->ifa_addr->sa_family == PF_INET)
*seen_ipv4 = true;
else if (runp->ifa_addr->sa_family == PF_INET6)
*seen_ipv6 = true;
(void) freeifaddrs (ifa);
}

4
sysdeps/generic/ifaddrs.c
View File

@ -1,5 +1,5 @@
/* getifaddrs -- get names and addresses of all network interfaces
Copyright (C) 2002 Free Software Foundation, Inc.
Copyright (C) 2002, 2003 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
@ -30,6 +30,7 @@ getifaddrs (struct ifaddrs **ifap)
__set_errno (ENOSYS);
return -1;
}
libc_hidden_def (getifaddrs)
stub_warning (getifaddrs)
void
@ -41,4 +42,5 @@ freeifaddrs (struct ifaddrs *ifa)
/* Can't be called properly if getifaddrs never succeeded. */
abort ();
}
libc_hidden_def (freeifaddrs)
stub_warning (freeifaddrs)

30
sysdeps/posix/getaddrinfo.c
View File

@ -925,32 +925,10 @@ getaddrinfo (const char *name, const char *service,
{
/* Determine whether we have IPv4 or IPv6 interfaces or both.
We cannot cache the results since new interfaces could be
added at any time.
XXX We are using getifaddrs here which is more costly than
it is really necessary. Once things are stable we will have
a special function which performs the task with less overhead. */
struct ifaddrs *ifa = NULL;
if (getifaddrs (&ifa) != 0)
/* Cannot get the interface list, very bad. */
return EAI_SYSTEM;
bool seen_ipv4 = false;
bool seen_ipv6 = false;
struct ifaddrs *runp = ifa;
while (runp != NULL)
{
if (runp->ifa_addr->sa_family == PF_INET)
seen_ipv4 = true;
else if (runp->ifa_addr->sa_family == PF_INET6)
seen_ipv6 = true;
runp = runp->ifa_next;
}
(void) freeifaddrs (ifa);
added at any time. */
bool seen_ipv4;
bool seen_ipv6;
__check_pf (&seen_ipv4, &seen_ipv6);
/* Now make a decision on what we return, if anything. */
if (hints->ai_family == PF_UNSPEC)

193
sysdeps/unix/sysv/linux/check_pf.c Normal file
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@ -0,0 +1,193 @@
/* Determine protocol families for which interfaces exist. Linux version.
Copyright (C) 2003 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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <errno.h>
#include <ifaddrs.h>
#include <netdb.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <sys/socket.h>
#include <asm/types.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include "kernel-features.h"
static int
make_request (int fd, pid_t pid, bool *seen_ipv4, bool *seen_ipv6)
{
struct
{
struct nlmsghdr nlh;
struct rtgenmsg g;
} 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;
memset (&nladdr, '\0', sizeof (nladdr));
nladdr.nl_family = AF_NETLINK;
if (TEMP_FAILURE_RETRY (__sendto (fd, (void *) &req, sizeof (req), 0,
(struct sockaddr *) &nladdr,
sizeof (nladdr))) < 0)
return -1;
*seen_ipv4 = false;
*seen_ipv6 = false;
bool done = false;
char buf[4096];
struct iovec iov = { buf, sizeof (buf) };
do
{
struct msghdr msg =
{
(void *) &nladdr, sizeof (nladdr),
&iov, 1,
NULL, 0,
0
};
ssize_t read_len = TEMP_FAILURE_RETRY (__recvmsg (fd, &msg, 0));
if (read_len < 0)
return -1;
if (msg.msg_flags & MSG_TRUNC)
return -1;
struct nlmsghdr *nlmh;
for (nlmh = (struct nlmsghdr *) buf;
NLMSG_OK (nlmh, (size_t) read_len);
nlmh = (struct nlmsghdr *) NLMSG_NEXT (nlmh, read_len))
{
if ((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);
switch (ifam->ifa_family)
{
case AF_INET:
*seen_ipv4 = true;
break;
case AF_INET6:
*seen_ipv6 = true;
break;
default:
/* Ignore. */
break;
}
}
else if (nlmh->nlmsg_type == NLMSG_DONE)
/* We found the end, leave the loop. */
done = true;
else ;
}
}
while (! done);
close (fd);
return 0;
}
/* We don't know if we have NETLINK support compiled in in our
Kernel. */
#if __ASSUME_NETLINK_SUPPORT == 0
/* Define in ifaddrs.h. */
extern int __no_netlink_support attribute_hidden;
#else
# define __no_netlink_support 0
#endif
void
attribute_hidden
__check_pf (bool *seen_ipv4, bool *seen_ipv6)
{
if (! __no_netlink_support)
{
int fd = __socket (PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
struct sockaddr_nl nladdr;
memset (&nladdr, '\0', sizeof (nladdr));
nladdr.nl_family = AF_NETLINK;
socklen_t addr_len = sizeof (nladdr);
if (fd >= 0
&& __bind (fd, (struct sockaddr *) &nladdr, sizeof (nladdr)) == 0
&& __getsockname (fd, (struct sockaddr *) &nladdr, &addr_len) == 0
&& make_request (fd, nladdr.nl_pid, seen_ipv4, seen_ipv6) == 0)
/* It worked. */
return;
if (fd >= 0)
close (fd);
#if __ASSUME_NETLINK_SUPPORT == 0
/* Remember that there is no netlink support. */
__no_netlink_support = 1;
#else
/* We cannot determine what interfaces are available. Be
pessimistic. */
*seen_ipv4 = true;
*seen_ipv6 = true;
#endif
}
#if __ASSUME_NETLINK_SUPPORT == 0
/* No netlink. Get the interface list via getifaddrs. */
struct ifaddrs *ifa = NULL;
if (getifaddrs (&ifa) != 0)
{
/* We cannot determine what interfaces are available. Be
pessimistic. */
*seen_ipv4 = true;
*seen_ipv6 = true;
return;
}
*seen_ipv4 = false;
*seen_ipv6 = false;
struct ifaddrs *runp;
for (runp = ifa; runp != NULL; runp = runp->ifa_next)
if (runp->ifa_addr->sa_family == PF_INET)
*seen_ipv4 = true;
else if (runp->ifa_addr->sa_family == PF_INET6)
*seen_ipv6 = true;
(void) freeifaddrs (ifa);
#endif
}

10
sysdeps/unix/sysv/linux/ifaddrs.c
View File

@ -41,7 +41,7 @@
/* We don't know if we have NETLINK support compiled in in our
Kernel, so include the old implementation as fallback. */
#if __ASSUME_NETLINK_SUPPORT == 0
static int no_netlink_support;
int __no_netlink_support attribute_hidden;
# define getifaddrs fallback_getifaddrs
# include "sysdeps/gnu/ifaddrs.c"
@ -49,7 +49,7 @@ static int no_netlink_support;
#else
# define no_netlink_support 0
# define __no_netlink_support 0
#endif
@ -297,17 +297,17 @@ getifaddrs (struct ifaddrs **ifap)
if (ifap)
*ifap = NULL;
if (! no_netlink_support && netlink_open (&nh) < 0)
if (! __no_netlink_support && netlink_open (&nh) < 0)
{
#if __ASSUME_NETLINK_SUPPORT == 0
no_netlink_support = 1;
__no_netlink_support = 1;
#else
return -1;
#endif
}
#if __ASSUME_NETLINK_SUPPORT == 0
if (no_netlink_support)
if (__no_netlink_support)
return fallback_getifaddrs (ifap);
#endif