1 files changed, 89 insertions, 15 deletions

diff --git a/src/process.c b/src/process.c
index 066edbc83d6..372277a953d 100644
--- a/src/process.c
+++ b/src/process.c
@@ -276,6 +276,10 @@ static int read_process_output (Lisp_Object, int);
 static void create_pty (Lisp_Object);
 static void exec_sentinel (Lisp_Object, Lisp_Object);
 
+static Lisp_Object
+network_lookup_address_info_1 (Lisp_Object host, const char *service,
+                               struct addrinfo *hints, struct addrinfo **res);
+
 /* Number of bits set in connect_wait_mask.  */
 static int num_pending_connects;
 
@@ -4106,7 +4110,7 @@ usage: (make-network-process &rest ARGS)  */)
   if (!NILP (host))
     {
       struct addrinfo *res, *lres;
-      int ret;
+      Lisp_Object msg;
 
       maybe_quit ();
 
@@ -4115,20 +4119,9 @@ usage: (make-network-process &rest ARGS)  */)
       hints.ai_family = family;
       hints.ai_socktype = socktype;
 
-      ret = getaddrinfo (SSDATA (host), portstring, &hints, &res);
-      if (ret)
-#ifdef HAVE_GAI_STRERROR
-        {
-          synchronize_system_messages_locale ();
-          char const *str = gai_strerror (ret);
-          if (! NILP (Vlocale_coding_system))
-            str = SSDATA (code_convert_string_norecord
-                          (build_string (str), Vlocale_coding_system, 0));
-          error ("%s/%s %s", SSDATA (host), portstring, str);
-        }
-#else
-        error ("%s/%s getaddrinfo error %d", SSDATA (host), portstring, ret);
-#endif
+      msg = network_lookup_address_info_1 (host, portstring, &hints, &res);
+      if (!EQ (msg, Qt))
+        error ("%s", SSDATA (msg));
 
       for (lres = res; lres; lres = lres->ai_next)
         addrinfos = Fcons (conv_addrinfo_to_lisp (lres), addrinfos);
@@ -4576,6 +4569,86 @@ Data that is unavailable is returned as nil.  */)
 #endif
 }
 
+static Lisp_Object
+network_lookup_address_info_1 (Lisp_Object host, const char *service,
+                               struct addrinfo *hints, struct addrinfo **res)
+{
+  Lisp_Object msg = Qt;
+  int ret;
+
+  if (STRING_MULTIBYTE (host) && SBYTES (host) != SCHARS (host))
+    error ("Non-ASCII hostname %s detected, please use puny-encode-domain",
+           SSDATA (host));
+  ret = getaddrinfo (SSDATA (host), service, hints, res);
+  if (ret)
+    {
+      if (service == NULL)
+        service = "0";
+#ifdef HAVE_GAI_STRERROR
+      synchronize_system_messages_locale ();
+      char const *str = gai_strerror (ret);
+      if (! NILP (Vlocale_coding_system))
+        str = SSDATA (code_convert_string_norecord
+                      (build_string (str), Vlocale_coding_system, 0));
+      AUTO_STRING (format, "%s/%s %s");
+      msg = CALLN (Fformat, format, host, build_string (service),
+                   build_string (str));
+#else
+      AUTO_STRING (format, "%s/%s getaddrinfo error %d");
+      msg = CALLN (Fformat, format, host, build_string (service),
+                   make_int (ret));
+#endif
+    }
+   return msg;
+}
+
+DEFUN ("network-lookup-address-info", Fnetwork_lookup_address_info,
+       Snetwork_lookup_address_info, 1, 2, 0,
+       doc: /* Look up ip address info of NAME.
+Optional parameter FAMILY controls whether to look up IPv4 or IPv6
+addresses.  The default of nil means both, symbol `ipv4' means IPv4
+only, symbol `ipv6' means IPv6 only.  Returns a list of addresses, or
+nil if none were found.  Each address is a vector of integers.  */)
+     (Lisp_Object name, Lisp_Object family)
+{
+  Lisp_Object addresses = Qnil;
+  Lisp_Object msg = Qnil;
+
+  struct addrinfo *res, *lres;
+  struct addrinfo hints;
+
+  memset (&hints, 0, sizeof hints);
+  if (EQ (family, Qnil))
+    hints.ai_family = AF_UNSPEC;
+  else if (EQ (family, Qipv4))
+    hints.ai_family = AF_INET;
+  else if (EQ (family, Qipv6))
+#ifdef AF_INET6
+    hints.ai_family = AF_INET6;
+#else
+  /* If we don't support IPv6, querying will never work anyway */
+    return addresses;
+#endif
+  else
+    error ("Unsupported lookup type");
+  hints.ai_socktype = SOCK_DGRAM;
+
+  msg = network_lookup_address_info_1 (name, NULL, &hints, &res);
+  if (!EQ (msg, Qt))
+    message ("%s", SSDATA(msg));
+  else
+    {
+      for (lres = res; lres; lres = lres->ai_next)
+        addresses = Fcons (conv_sockaddr_to_lisp (lres->ai_addr,
+                                                  lres->ai_addrlen),
+                           addresses);
+      addresses = Fnreverse (addresses);
+
+      freeaddrinfo (res);
+    }
+  return addresses;
+}
+
 /* Turn off input and output for process PROC.  */
 
 static void
@@ -8345,6 +8418,7 @@ returns non-`nil'.  */);
   defsubr (&Sset_network_process_option);
   defsubr (&Smake_network_process);
   defsubr (&Sformat_network_address);
+  defsubr (&Snetwork_lookup_address_info);
   defsubr (&Snetwork_interface_list);
   defsubr (&Snetwork_interface_info);
 #ifdef DATAGRAM_SOCKETS