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Diffstat (limited to 'libc/sysdeps/posix/getaddrinfo.c')
-rw-r--r--libc/sysdeps/posix/getaddrinfo.c82
1 files changed, 77 insertions, 5 deletions
diff --git a/libc/sysdeps/posix/getaddrinfo.c b/libc/sysdeps/posix/getaddrinfo.c
index 298755f8e..adb3c4f96 100644
--- a/libc/sysdeps/posix/getaddrinfo.c
+++ b/libc/sysdeps/posix/getaddrinfo.c
@@ -61,6 +61,10 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include <nscd/nscd-client.h>
#include <nscd/nscd_proto.h>
+#ifdef HAVE_NETLINK_ROUTE
+# include <kernel-features.h>
+#endif
+
#ifdef HAVE_LIBIDN
extern int __idna_to_ascii_lz (const char *input, char **output, int flags);
extern int __idna_to_unicode_lzlz (const char *input, char **output,
@@ -1095,6 +1099,10 @@ static const struct prefixentry default_labels[] =
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } } },
7, 6 },
{ { .in6_u
+ = { .u6_addr8 = { 0x20, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } } },
+ 32, 7 },
+ { { .in6_u
= { .u6_addr8 = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } } },
0, 1 }
@@ -1728,6 +1736,16 @@ gaiconf_reload (void)
}
+#if HAVE_NETLINK_ROUTE
+# if __ASSUME_NETLINK_SUPPORT == 0
+/* Defined in ifaddrs.c. */
+extern int __no_netlink_support attribute_hidden;
+# else
+# define __no_netlink_support 0
+# endif
+#endif
+
+
int
getaddrinfo (const char *name, const char *service,
const struct addrinfo *hints, struct addrinfo **pai)
@@ -1763,20 +1781,74 @@ getaddrinfo (const char *name, const char *service,
return EAI_BADFLAGS;
struct in6addrinfo *in6ai = NULL;
- size_t in6ailen;
+ size_t in6ailen = 0;
bool seen_ipv4 = false;
bool seen_ipv6 = false;
+#ifdef HAVE_NETLINK_ROUTE
+ int sockfd = -1;
+ pid_t nl_pid;
+#endif
/* We might need information about what kind of interfaces are available.
But even if AI_ADDRCONFIG is not used, if the user requested IPv6
addresses we have to know whether an address is deprecated or
temporary. */
if ((hints->ai_flags & AI_ADDRCONFIG) || hints->ai_family == PF_UNSPEC
|| hints->ai_family == PF_INET6)
- /* Determine whether we have IPv4 or IPv6 interfaces or both. We
- cannot cache the results since new interfaces could be added at
- any time. */
- __check_pf (&seen_ipv4, &seen_ipv6, &in6ai, &in6ailen);
+ {
+ /* Determine whether we have IPv4 or IPv6 interfaces or both. We
+ cannot cache the results since new interfaces could be added at
+ any time. */
+ __check_pf (&seen_ipv4, &seen_ipv6, &in6ai, &in6ailen);
+#ifdef HAVE_NETLINK_ROUTE
+ if (! __no_netlink_support)
+ {
+ sockfd = __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 (sockfd >= 0
+ && __bind (fd, (struct sockaddr *) &nladdr, sizeof (nladdr)) == 0
+ && __getsockname (sockfd, (struct sockaddr *) &nladdr,
+ &addr_len) == 0
+ && make_request (sockfd, nladdr.nl_pid, &seen_ipv4, &seen_ipv6,
+ in6ai, in6ailen) == 0)
+ {
+ /* It worked. */
+ nl_pid = nladdr.nl_pid;
+ goto got_netlink_socket;
+ }
+
+ if (sockfd >= 0)
+ close_not_cancel_no_status (sockfd);
+
+#if __ASSUME_NETLINK_SUPPORT == 0
+ /* Remember that there is no netlink support. */
+ if (errno != EMFILE && errno != ENFILE)
+ __no_netlink_support = 1;
+#else
+ else
+ {
+ if (errno != EMFILE && errno != ENFILE)
+ sockfd = -2;
+
+ /* We cannot determine what interfaces are available. Be
+ pessimistic. */
+ seen_ipv4 = true;
+ seen_ipv6 = true;
+ return;
+ }
+#endif
+ }
+#endif
+ }
+
+#ifdef HAVE_NETLINK_ROUTE
+ got_netlink_socket:
+#endif
if (hints->ai_flags & AI_ADDRCONFIG)
{
/* Now make a decision on what we return, if anything. */