diff --git a/ChangeLog b/ChangeLog
index 68a9ea47fc..c3d439f164 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,20 @@
+2004-03-07  Ulrich Drepper  <drepper@redhat.com>
+
+	* config.h.in: Add entry for HAVE_LIBIDN.
+	* configure.in: If libidn add-on present define HAVE_LIBIDN.
+	* Versions.def: Add entry for libcidn.
+
+2004-03-07  Simon Josefsson  <jas@extundo.com>
+
+	* resolv/netdb.h [__USE_GNU]: Add new AI_IDN ai_flags for addrinfo.
+	[__USE_GNU]: Add new error code EAI_IDN_ENCODE for getaddrinfo.
+	* sysdeps/posix/getaddrinfo.c: Add prototype for __idna_to_ascii_lz
+	and define IDNA_SUCCESS.
+	(gaih_inet): If ai_flags have AI_IDN, invoke __idna_to_ascii_lz.
+	(getaddrinfo): Fix EAI_BADFLAGS test to include AI_IDN.
+	All changes only applicable when glibc is compiled with the libidn
+	add-on.
+
 2004-03-07  Ulrich Drepper  <drepper@redhat.com>
 
 	* sysdeps/unix/sysv/linux/ia64/dl-static.c (_dl_static_init): Call
diff --git a/Versions.def b/Versions.def
index 4e015dc260..67f0e5ed3d 100644
--- a/Versions.def
+++ b/Versions.def
@@ -108,3 +108,6 @@ libthread_db {
 libanl {
   GLIBC_2.2.3
 }
+libcidn {
+  GLIBC_PRIVATE
+}
diff --git a/config.h.in b/config.h.in
index ed6e701df0..86b1e39a7e 100644
--- a/config.h.in
+++ b/config.h.in
@@ -205,6 +205,9 @@
 /* Defined if the linker supports the -z relro option.  */
 #undef HAVE_Z_RELRO
 
+/* Defined of libidn is available.  */
+#undef HAVE_LIBIDN
+
 /*
  */
 
diff --git a/configure b/configure
index 24d5ee3375..4fdb46511d 100755
--- a/configure
+++ b/configure
@@ -7293,6 +7293,7 @@ use_ldconfig=no
 ldd_rewrite_script=no
 libc_cv_sysconfdir=$sysconfdir
 libc_cv_gcc_unwind_find_fde=no
+libc_cv_idn=no
 
 # Iterate over all the sysdep directories we will use, running their
 # configure fragments, and looking for a uname implementation.
@@ -7467,6 +7468,13 @@ if test $shared = default; then
   fi
 fi
 
+if test x"$libc_cv_idn" = xyes; then
+  cat >>confdefs.h <<\_ACEOF
+#define HAVE_LIBIDN 1
+_ACEOF
+
+fi
+
 echo "$as_me:$LINENO: checking whether -fPIC is default" >&5
 echo $ECHO_N "checking whether -fPIC is default... $ECHO_C" >&6
 if test "${pic_default+set}" = set; then
diff --git a/configure.in b/configure.in
index ba7fc3d9d9..30cf01266c 100644
--- a/configure.in
+++ b/configure.in
@@ -1903,6 +1903,7 @@ use_ldconfig=no
 ldd_rewrite_script=no
 libc_cv_sysconfdir=$sysconfdir
 libc_cv_gcc_unwind_find_fde=no
+libc_cv_idn=no
 
 # Iterate over all the sysdep directories we will use, running their
 # configure fragments, and looking for a uname implementation.
@@ -2045,6 +2046,10 @@ if test $shared = default; then
   fi
 fi
 
+if test x"$libc_cv_idn" = xyes; then
+  AC_DEFINE(HAVE_LIBIDN)
+fi
+
 AC_CACHE_CHECK([whether -fPIC is default], pic_default,
 [pic_default=yes
 cat > conftest.c <<EOF
diff --git a/resolv/netdb.h b/resolv/netdb.h
index cca9ffc830..5aaa387166 100644
--- a/resolv/netdb.h
+++ b/resolv/netdb.h
@@ -1,4 +1,4 @@
-  /* Copyright (C) 1996-2002, 2003 Free Software Foundation, Inc.
+  /* Copyright (C) 1996-2002, 2003, 2004 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
@@ -573,6 +573,11 @@ struct gaicb
 # define AI_ALL		0x0010	/* Return IPv4 mapped and IPv6 addresses.  */
 # define AI_ADDRCONFIG	0x0020	/* Use configuration of this host to choose
 				   returned address type..  */
+# ifdef __USE_GNU
+#  define AI_IDN	0x0040	/* IDN encode input (assuming it is encoded
+				   in the current locale's character set)
+				   before looking it up. */
+# endif
 
 /* Error values for `getaddrinfo' function.  */
 # define EAI_BADFLAGS	  -1	/* Invalid value for `ai_flags' field.  */
@@ -592,6 +597,7 @@ struct gaicb
 #  define EAI_NOTCANCELED -102	/* Request not canceled.  */
 #  define EAI_ALLDONE	  -103	/* All requests done.  */
 #  define EAI_INTR	  -104	/* Interrupted by a signal.  */
+#  define EAI_IDN_ENCODE  -105	/* IDN encoding failed.  */
 # endif
 
 # define NI_MAXHOST      1025
diff --git a/sysdeps/posix/getaddrinfo.c b/sysdeps/posix/getaddrinfo.c
index afdefdfb52..2b6f0ba0ac 100644
--- a/sysdeps/posix/getaddrinfo.c
+++ b/sysdeps/posix/getaddrinfo.c
@@ -55,6 +55,9 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include <nsswitch.h>
 #include <not-cancel.h>
 
+extern int __idna_to_ascii_lz (const char *input, char **output, int flags);
+#define IDNA_SUCCESS 0
+
 #define GAIH_OKIFUNSPEC 0x0100
 #define GAIH_EAI        ~(GAIH_OKIFUNSPEC)
 
@@ -539,6 +542,18 @@ gaih_inet (const char *name, const struct gaih_service *service,
       at->scopeid = 0;
       at->next = NULL;
 
+#ifdef HAVE_LIBIDN
+      if (req->ai_flags & AI_IDN)
+	{
+	  char *p = NULL;
+	  rc = __idna_to_ascii_lz (name, &p, 0);
+	  if (rc != IDNA_SUCCESS)
+	    return -EAI_IDN_ENCODE;
+	  name = strdupa (p);
+	  free (p);
+	}
+#endif
+
       if (inet_pton (AF_INET, name, at->addr) > 0)
 	{
 	  if (req->ai_family == AF_UNSPEC || req->ai_family == AF_INET)
@@ -1252,6 +1267,9 @@ getaddrinfo (const char *name, const char *service,
 
   if (hints->ai_flags
       & ~(AI_PASSIVE|AI_CANONNAME|AI_NUMERICHOST|AI_ADDRCONFIG|AI_V4MAPPED
+#ifdef HAVE_LIBIDN
+	  |AI_IDN
+#endif
 	  |AI_ALL))
     return EAI_BADFLAGS;