(gaih_inet): If req->ai_family == AF_UNSPEC don't allow the IPv6 lookup to return...

diff --git a/sysdeps/posix/getaddrinfo.c b/sysdeps/posix/getaddrinfo.c
index 59e2cec..45d1da2 100644 (file)
--- a/sysdeps/posix/getaddrinfo.c
+++ b/sysdeps/posix/getaddrinfo.c
@@ -45,6 +45,7 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include <assert.h>
 #include <errno.h>
 #include <netdb.h>
+#include <resolv.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -430,11 +431,22 @@ gaih_inet (const char *name, const struct gaih_service *service,
          struct gaih_addrtuple **pat = &at;
          int no_data = 0;
          int no_inet6_data;
+         int old_res_options = _res.options;
+
+         /* If we are looking for both IPv4 and IPv6 address we don't
+            want the lookup functions to automatically promote IPv4
+            addresses to IPv6 addresses.  Currently this is decided
+            by setting the RES_USE_INET6 bit in _res.options.  */
+         if (req->ai_family == AF_UNSPEC)
+           _res.options &= ~RES_USE_INET6;
 
          if (req->ai_family == AF_UNSPEC || req->ai_family == AF_INET6)
            gethosts (AF_INET6, struct in6_addr);
          no_inet6_data = no_data;
 
+         if (req->ai_family == AF_UNSPEC)
+           _res.options = old_res_options;
+
          if (req->ai_family == AF_UNSPEC || req->ai_family == AF_INET)
            gethosts (AF_INET, struct in_addr);