/* Determine protocol families for which interfaces exist. Linux version.
- Copyright (C) 2003, 2006, 2007 Free Software Foundation, Inc.
+ 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
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
-#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 <linux/netlink.h>
#include <linux/rtnetlink.h>
-#include <not-cancel.h>
-#include <kernel-features.h>
-
-
-#ifndef IFA_F_TEMPORARY
-# define IFA_F_TEMPORARY IFA_F_SECONDARY
-#endif
-#ifndef IFA_F_HOMEADDRESS
-# define IFA_F_HOMEADDRESS 0
-#endif
+#include "kernel-features.h"
static int
-make_request (int fd, pid_t pid, bool *seen_ipv4, bool *seen_ipv6,
- struct in6addrinfo **in6ai, size_t *in6ailen)
+make_request (int fd, pid_t pid, bool *seen_ipv4, bool *seen_ipv6)
{
- struct req
+ struct
{
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_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
- /* Help the compiler optimize out the malloc call if PAGE_SIZE
- is constant and smaller or equal to PTHREAD_STACK_MIN/4. */
- const size_t buf_size = PAGE_SIZE;
-#else
- const size_t buf_size = __getpagesize ();
-#endif
- bool use_malloc = false;
- char *buf;
-
- if (__libc_use_alloca (buf_size))
- buf = alloca (buf_size);
- else
- {
- buf = malloc (buf_size);
- if (buf != NULL)
- use_malloc = true;
- else
- goto out_fail;
- }
-
- 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;
+ return -1;
*seen_ipv4 = false;
*seen_ipv6 = false;
bool done = false;
- struct in6ailist
- {
- struct in6addrinfo info;
- struct in6ailist *next;
- } *in6ailist = NULL;
- size_t in6ailistlen = 0;
+ char buf[4096];
+ struct iovec iov = { buf, sizeof (buf) };
do
{
ssize_t read_len = TEMP_FAILURE_RETRY (__recvmsg (fd, &msg, 0));
if (read_len < 0)
- goto out_fail;
+ return -1;
if (msg.msg_flags & MSG_TRUNC)
- goto out_fail;
+ return -1;
struct nlmsghdr *nlmh;
for (nlmh = (struct nlmsghdr *) buf;
break;
case AF_INET6:
*seen_ipv6 = true;
-
- if (ifam->ifa_flags & (IFA_F_DEPRECATED
- | IFA_F_TEMPORARY
- | IFA_F_HOMEADDRESS))
- {
- struct rtattr *rta = IFA_RTA (ifam);
- size_t len = (nlmh->nlmsg_len
- - NLMSG_LENGTH (sizeof (*ifam)));
- void *local = NULL;
- 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);
- break;
- }
-
- rta = RTA_NEXT (rta, len);
- }
-
- struct in6ailist *newp = alloca (sizeof (*newp));
- newp->info.flags = (((ifam->ifa_flags & IFA_F_DEPRECATED)
- ? in6ai_deprecated : 0)
- | ((ifam->ifa_flags
- & IFA_F_TEMPORARY)
- ? in6ai_temporary : 0)
- | ((ifam->ifa_flags
- & IFA_F_HOMEADDRESS)
- ? in6ai_homeaddress : 0));
- memcpy (newp->info.addr, address ?: local,
- sizeof (newp->info.addr));
- newp->next = in6ailist;
- in6ailist = newp;
- ++in6ailistlen;
- }
break;
default:
/* Ignore. */
else if (nlmh->nlmsg_type == NLMSG_DONE)
/* We found the end, leave the loop. */
done = true;
+ else ;
}
}
while (! done);
- close_not_cancel_no_status (fd);
-
- if (in6ailist != NULL)
- {
- *in6ai = malloc (in6ailistlen * sizeof (**in6ai));
- if (*in6ai == NULL)
- goto out_fail;
-
- *in6ailen = in6ailistlen;
+ __close (fd);
- do
- {
- (*in6ai)[--in6ailistlen] = in6ailist->info;
- in6ailist = in6ailist->next;
- }
- while (in6ailist != NULL);
- }
-
- if (use_malloc)
- free (buf);
return 0;
-
-out_fail:
- if (use_malloc)
- free (buf);
- return -1;
}
void
attribute_hidden
-__check_pf (bool *seen_ipv4, bool *seen_ipv6,
- struct in6addrinfo **in6ai, size_t *in6ailen)
+__check_pf (bool *seen_ipv4, bool *seen_ipv6)
{
- *in6ai = NULL;
- *in6ailen = 0;
-
if (! __no_netlink_support)
{
int fd = __socket (PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
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,
- in6ai, in6ailen) == 0)
+ && make_request (fd, nladdr.nl_pid, seen_ipv4, seen_ipv6) == 0)
/* It worked. */
return;
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)
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