r5118: added support for node status replies in nbtd. nmblookup -S now works against Samba4.

Also added support for the '*' wildcard name
(This used to be commit 2dd7ccf72444db668fa970c3a95de1448baea224)

5 files changed, 148 insertions, 14 deletions

diff --git a/source4/nbt_server/config.mk b/source4/nbt_server/config.mk
index e3f52a64e6..2501c01417 100644
--- a/source4/nbt_server/config.mk
+++ b/source4/nbt_server/config.mk
@@ -9,6 +9,7 @@ ADD_OBJ_FILES = \
 		nbt_server/interfaces.o \
 		nbt_server/register.o \
 		nbt_server/query.o \
+		nbt_server/nodestatus.o \
 		nbt_server/winsserver.o \
 		nbt_server/packet.o
 REQUIRED_SUBSYSTEMS = \
diff --git a/source4/nbt_server/nbt_server.h b/source4/nbt_server/nbt_server.h
index 49a07ca95e..602d7b2e46 100644
--- a/source4/nbt_server/nbt_server.h
+++ b/source4/nbt_server/nbt_server.h
@@ -62,3 +62,10 @@ struct nbt_server {
 
 
 
+/* check a condition on an incoming packet */
+#define NBT_ASSERT_PACKET(packet, src_address, test) do { \
+	if (!(test)) { \
+		nbt_bad_packet(packet, src_address, #test); \
+		return; \
+	} \
+} while (0)
diff --git a/source4/nbt_server/nodestatus.c b/source4/nbt_server/nodestatus.c
new file mode 100644
index 0000000000..f57c86d10f
--- /dev/null
+++ b/source4/nbt_server/nodestatus.c
@@ -0,0 +1,124 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   answer node status queries
+
+   Copyright (C) Andrew Tridgell	2005
+   
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+#include "dlinklist.h"
+#include "system/network.h"
+#include "nbt_server/nbt_server.h"
+
+/*
+  send a name status reply
+*/
+static void nbt_node_status_reply(struct nbt_name_socket *nbtsock, 
+				  struct nbt_name_packet *request_packet, 
+				  const char *src_address, int src_port,
+				  struct nbt_name *name, 
+				  struct nbt_interface *iface)
+{
+	struct nbt_name_packet *packet;
+	uint32_t name_count;
+	struct nbt_iface_name *iname;
+	
+	/* work out how many names to send */
+	name_count = 0;
+	for (iname=iface->names;iname;iname=iname->next) {
+		if ((iname->nb_flags & NBT_NM_ACTIVE) && 
+		    strcmp(iname->name.name, "*") != 0) {
+			name_count++;
+		}
+	}
+
+	packet = talloc_zero(nbtsock, struct nbt_name_packet);
+	if (packet == NULL) return;
+
+	packet->name_trn_id = request_packet->name_trn_id;
+	packet->ancount = 1;
+	packet->operation = NBT_OPCODE_QUERY | NBT_FLAG_REPLY | NBT_FLAG_AUTHORITIVE;
+
+	packet->answers = talloc_array(packet, struct nbt_res_rec, 1);
+	if (packet->answers == NULL) goto failed;
+
+	packet->answers[0].name     = *name;
+	packet->answers[0].rr_type  = NBT_QTYPE_STATUS;
+	packet->answers[0].rr_class = NBT_QCLASS_IP;
+	packet->answers[0].ttl      = 0;
+	packet->answers[0].rdata.status.num_names = name_count;
+	packet->answers[0].rdata.status.names = talloc_array(packet->answers,
+							     struct nbt_status_name, name_count);
+	if (packet->answers[0].rdata.status.names == NULL) goto failed;
+
+	name_count = 0;
+	for (iname=iface->names;iname;iname=iname->next) {
+		if ((iname->nb_flags & NBT_NM_ACTIVE) && 
+		    strcmp(iname->name.name, "*") != 0) {
+			struct nbt_status_name *n = &packet->answers[0].rdata.status.names[name_count];
+			n->name = talloc_asprintf(packet->answers, "%-15s", iname->name.name);
+			if (n->name == NULL) goto failed;
+			n->type     = iname->name.type;
+			n->nb_flags = iname->nb_flags;
+			name_count++;
+		}
+	}
+	/* we deliberately don't fill in the statistics structure as
+	   it could lead to giving attackers too much information */
+	ZERO_STRUCT(packet->answers[0].rdata.status.statistics);
+
+	DEBUG(7,("Sending node status reply for %s<%02x> to %s:%d\n", 
+		 name->name, name->type, src_address, src_port));
+	
+	nbt_name_reply_send(nbtsock, src_address, src_port, packet);
+
+failed:
+	talloc_free(packet);
+}
+
+
+/*
+  answer a node status query
+*/
+void nbt_query_status(struct nbt_name_socket *nbtsock, 
+		      struct nbt_name_packet *packet, 
+		      const char *src_address, int src_port)
+{
+	struct nbt_interface *iface;
+	struct nbt_name *name;
+	struct nbt_iface_name *iname;
+
+	/* find the interface for this query */
+	iface = nbt_iface_find(nbtsock, src_address);
+
+	NBT_ASSERT_PACKET(packet, src_address, packet->qdcount == 1);
+	NBT_ASSERT_PACKET(packet, src_address, packet->questions[0].question_type == NBT_QTYPE_STATUS);
+	NBT_ASSERT_PACKET(packet, src_address, packet->questions[0].question_class == NBT_QCLASS_IP);
+
+	/* see if we have the requested name on this interface */
+	name = &packet->questions[0].name;
+
+	iname = nbt_find_iname(iface, name, NBT_NM_ACTIVE);
+	if (iname == NULL) {
+		DEBUG(7,("Node status query for %s<%02x> from %s - not found on %s\n",
+			 name->name, name->type, src_address, iface->ip_address));
+		return;
+	}
+
+	nbt_node_status_reply(nbtsock, packet, src_address, src_port, &iname->name, iface);
+}
diff --git a/source4/nbt_server/query.c b/source4/nbt_server/query.c
index c962a691c6..859a9c7f26 100644
--- a/source4/nbt_server/query.c
+++ b/source4/nbt_server/query.c
@@ -25,15 +25,6 @@
 #include "system/network.h"
 #include "nbt_server/nbt_server.h"
 
-/* check a condition on an incoming packet */
-#define NBT_ASSERT_PACKET(packet, src_address, test) do { \
-	if (!(test)) { \
-		nbt_bad_packet(packet, src_address, #test); \
-		return; \
-	} \
-} while (0)
-
-
 /*
   send a name query reply
 */
@@ -92,6 +83,13 @@ void nbt_request_query(struct nbt_name_socket *nbtsock,
 	struct nbt_iface_name *iname;
 	struct nbt_name *name;
 
+	/* see if its a node status query */
+	if (packet->qdcount == 1 &&
+	    packet->questions[0].question_type == NBT_QTYPE_STATUS) {
+		nbt_query_status(nbtsock, packet, src_address, src_port);
+		return;
+	}
+
 	/* if its a WINS query then direct to our WINS server */
 	if ((packet->operation & NBT_FLAG_RECURSION_DESIRED) &&
 	    !(packet->operation & NBT_FLAG_BROADCAST)) {
diff --git a/source4/nbt_server/register.c b/source4/nbt_server/register.c
index 7f7c291cf0..e5033f4f5e 100644
--- a/source4/nbt_server/register.c
+++ b/source4/nbt_server/register.c
@@ -88,7 +88,7 @@ static void nbt_register_name_iface(struct nbt_interface *iface,
 	iname->ttl               = lp_parm_int(-1, "nbtd", "bcast_ttl", 300000);
 	iname->registration_time = timeval_zero();
 
-	DLIST_ADD(iface->names, iname);
+	DLIST_ADD_END(iface->names, iname, struct nbt_iface_name *);
 
 	if (nb_flags & NBT_NM_PERMANENT) {
 		/* permanent names are not announced and are immediately active */
@@ -145,8 +145,12 @@ void nbt_register_names(struct nbt_server *nbtsrv)
 	nbt_register_name(nbtsrv, lp_netbios_name(), NBT_NAME_CLIENT, nb_flags);
 	nbt_register_name(nbtsrv, lp_netbios_name(), NBT_NAME_USER,   nb_flags);
 	nbt_register_name(nbtsrv, lp_netbios_name(), NBT_NAME_SERVER, nb_flags);
-	nbt_register_name(nbtsrv, lp_workgroup(),    NBT_NAME_CLIENT, nb_flags | NBT_NM_GROUP);
-	nbt_register_name(nbtsrv, lp_workgroup(),    NBT_NAME_SERVER, nb_flags | NBT_NM_GROUP);
-	nbt_register_name(nbtsrv, "__SAMBA__",       NBT_NAME_CLIENT, nb_flags | NBT_NM_PERMANENT);
-	nbt_register_name(nbtsrv, "__SAMBA__",       NBT_NAME_SERVER, nb_flags | NBT_NM_PERMANENT);
+
+	nb_flags |= NBT_NM_GROUP;
+	nbt_register_name(nbtsrv, lp_workgroup(),    NBT_NAME_CLIENT, nb_flags);
+
+	nb_flags |= NBT_NM_PERMANENT;
+	nbt_register_name(nbtsrv, "__SAMBA__",       NBT_NAME_CLIENT, nb_flags);
+	nbt_register_name(nbtsrv, "__SAMBA__",       NBT_NAME_SERVER, nb_flags);
+	nbt_register_name(nbtsrv, "*",               NBT_NAME_CLIENT, nb_flags);
 }