nslookup implementation

grub-core/Makefile.core.def

@@ -1598,6 +1598,7 @@ module = {
 module = {
   name = net;
   common = net/net.c;
+  common = net/dns.c;
   common = net/bootp.c;
   common = net/ip.c;
   common = net/udp.c;

grub-core/net/bootp.c

@@ -541,7 +541,7 @@ grub_cmd_bootp (struct grub_command *cmd __attribute__ ((unused)),
   return err;
 }
 
-static grub_command_t cmd_dhcp, cmd_getdhcp, cmd_bootp;
+static grub_command_t cmd_getdhcp, cmd_bootp;
 
 void
 grub_bootp_init (void)
@@ -549,9 +549,6 @@ grub_bootp_init (void)
   cmd_bootp = grub_register_command ("net_bootp", grub_cmd_bootp,
 				     "[CARD]",
 				     N_("perform a bootp autoconfiguration"));
-  cmd_dhcp = grub_register_command ("net_dhcp", grub_cmd_bootp,
-				     "[CARD]",
-				     N_("perform a bootp autoconfiguration"));
   cmd_getdhcp = grub_register_command ("net_get_dhcp_option", grub_cmd_dhcpopt,
 				       N_("VAR INTERFACE NUMBER DESCRIPTION"),
 				       N_("retrieve DHCP option and save it into VAR. If VAR is - then print the value."));
@@ -561,6 +558,5 @@ void
 grub_bootp_fini (void)
 {
   grub_unregister_command (cmd_getdhcp);
-  grub_unregister_command (cmd_dhcp);
   grub_unregister_command (cmd_bootp);
 }

grub-core/net/net.c

@@ -1491,6 +1491,7 @@ GRUB_MOD_INIT(net)
   cmd_lsaddr = grub_register_command ("net_ls_addr", grub_cmd_listaddrs,
 				       "", N_("list network addresses"));
   grub_bootp_init ();
+  grub_dns_init ();
 
   grub_fs_register (&grub_net_fs);
   grub_net_open = grub_net_open_real;
@@ -1503,6 +1504,7 @@ GRUB_MOD_INIT(net)
 GRUB_MOD_FINI(net)
 {
   grub_bootp_fini ();
+  grub_dns_fini ();
   grub_unregister_command (cmd_addaddr);
   grub_unregister_command (cmd_deladdr);
   grub_unregister_command (cmd_addroute);

grub-core/net/tftp.c

@@ -279,6 +279,7 @@ tftp_open (struct grub_file *file, const char *filename)
   tftp_data_t data;
   grub_err_t err;
   grub_uint8_t *nbd;
+  grub_net_network_level_address_t addr;
 
   data = grub_zalloc (sizeof (*data));
   if (!data)
@@ -335,7 +336,14 @@ tftp_open (struct grub_file *file, const char *filename)
   if (!data->pq)
     return grub_errno;
 
-  data->sock = grub_net_udp_open (file->device->net->server,
+  err = grub_net_resolve_address (file->device->net->server, &addr);
+  if (err)
+    {
+      destroy_pq (data);
+      return err;
+    }
+
+  data->sock = grub_net_udp_open (addr,
 				  TFTP_SERVER_PORT, tftp_receive,
 				  file);
   if (!data->sock)

grub-core/net/udp.c

@@ -59,7 +59,7 @@ grub_net_udp_close (grub_net_udp_socket_t sock)
 }
 
 grub_net_udp_socket_t
-grub_net_udp_open (char *server,
+grub_net_udp_open (grub_net_network_level_address_t addr,
 		   grub_uint16_t out_port,
 		   grub_err_t (*recv_hook) (grub_net_udp_socket_t sock,
 					    struct grub_net_buff *nb,
@@ -67,17 +67,12 @@ grub_net_udp_open (char *server,
 		   void *recv_hook_data)
 {
   grub_err_t err;
-  grub_net_network_level_address_t addr;
   struct grub_net_network_level_interface *inf;
   grub_net_network_level_address_t gateway;
   grub_net_udp_socket_t socket;
   static int in_port = 25300;
   grub_net_link_level_address_t ll_target_addr;
 
-  err = grub_net_resolve_address (server, &addr);
-  if (err)
-    return NULL;
-
   if (addr.type != GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4
       && addr.type != GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV6)
     {

include/grub/err.h

@@ -65,7 +65,8 @@ typedef enum
     GRUB_ERR_NET_PORT_CLOSED,
     GRUB_ERR_NET_INVALID_RESPONSE,
     GRUB_ERR_NET_UNKNOWN_ERROR,
-    GRUB_ERR_NET_PACKET_TOO_BIG
+    GRUB_ERR_NET_PACKET_TOO_BIG,
+    GRUB_ERR_NET_NO_DOMAIN
   }
 grub_err_t;
 

include/grub/net.h

@@ -446,6 +446,9 @@ grub_net_poll_cards (unsigned time);
 void grub_bootp_init (void);
 void grub_bootp_fini (void);
 
+void grub_dns_init (void);
+void grub_dns_fini (void);
+
 static inline void
 grub_net_network_level_interface_unregister (struct grub_net_network_level_interface *inter)
 {
@@ -472,6 +475,13 @@ grub_err_t
 grub_net_link_layer_resolve (struct grub_net_network_level_interface *inf,
 			     const grub_net_network_level_address_t *proto_addr,
 			     grub_net_link_level_address_t *hw_addr);
+grub_err_t
+grub_net_dns_lookup (const char *name,
+		     const struct grub_net_network_level_address *servers,
+		     grub_size_t n_servers,
+		     grub_size_t *naddresses,
+		     struct grub_net_network_level_address **addresses,
+		     int cache);
 
 extern char *grub_net_default_server;
 

include/grub/net/udp.h

@@ -33,7 +33,7 @@ struct grub_net_udp_socket;
 typedef struct grub_net_udp_socket *grub_net_udp_socket_t;
 
 grub_net_udp_socket_t
-grub_net_udp_open (char *server,
+grub_net_udp_open (grub_net_network_level_address_t addr,
 		   grub_uint16_t out_port,
 		   grub_err_t (*recv_hook) (grub_net_udp_socket_t sock,
 					    struct grub_net_buff *nb,