r5251: - renamed the nbtd server side structures to have a nbtd_ prefix, to

  be consistent with the function names

- added WINS client support to the NBT server. It will do initial WINS
  registration, and WINS refresh, automatically failing over to
  secondary WINS servers and handling multi-homed servers where we need
  to register multiple IPs.

- added support for multi-homed name query replies, which are
  essential for multi-homed registration as the WINS server will query
  us to ensure we have the names when doing the secondary IPs in
  multi-homed registration
(This used to be commit a1553fa8054dc7d33f5d77f8f95d3ffd90392b2a)

1 files changed, 123 insertions, 0 deletions

diff --git a/source4/nbt_server/winsclient.c b/source4/nbt_server/winsclient.c
new file mode 100644
index 0000000000..572d46ba4b
--- /dev/null
+++ b/source4/nbt_server/winsclient.c
@@ -0,0 +1,123 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   wins client name registration and refresh
+
+   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 "nbt_server/nbt_server.h"
+#include "libcli/raw/libcliraw.h"
+#include "libcli/composite/composite.h"
+#include "lib/events/events.h"
+#include "smbd/service_task.h"
+
+
+/*
+  refresh a WINS name registration
+*/
+static void nbtd_refresh_wins_refresh(struct event_context *ev, struct timed_event *te,
+				       struct timeval t, void *private)
+{
+	struct nbtd_iface_name *iname = talloc_get_type(private, struct nbtd_iface_name);
+	nbtd_winsclient_refresh(iname);
+}
+
+/*
+  called when a wins name refresh has completed
+*/
+static void nbtd_refresh_wins_handler(struct composite_context *c)
+{
+	NTSTATUS status;
+	struct nbt_name_refresh_wins io;
+	struct nbtd_iface_name *iname = talloc_get_type(c->async.private, 
+							struct nbtd_iface_name);
+	TALLOC_CTX *tmp_ctx = talloc_new(iname);
+
+	status = nbt_name_refresh_wins_recv(c, tmp_ctx, &io);
+	if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
+		/* none of the WINS servers responded - try again 
+		   periodically */
+		int wins_retry_time = lp_parm_int(-1, "nbt", "wins_retry", 300);
+		event_add_timed(iname->iface->nbtsrv->task->event_ctx, 
+				iname,
+				timeval_current_ofs(wins_retry_time, 0),
+				nbtd_refresh_wins_refresh,
+				iname);
+		talloc_free(tmp_ctx);
+		return;
+	}
+
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(1,("Name refresh failure with WINS for %s<%02x> - %s\n", 
+			 iname->name.name, iname->name.type, nt_errstr(status)));
+		talloc_free(tmp_ctx);
+		return;
+	}	
+
+	if (io.out.rcode != 0) {
+		DEBUG(1,("WINS server %s rejected name refresh of %s<%02x> - rcode %d\n", 
+			 io.out.wins_server, iname->name.name, iname->name.type, io.out.rcode));
+		iname->nb_flags |= NBT_NM_CONFLICT;
+		talloc_free(tmp_ctx);
+		return;
+	}	
+
+	/* success - start a periodic name refresh */
+	iname->nb_flags |= NBT_NM_ACTIVE;
+	if (iname->wins_server) {
+		talloc_free(iname->wins_server);
+	}
+	iname->wins_server = talloc_steal(iname, io.out.wins_server);
+
+	iname->registration_time = timeval_current();
+	event_add_timed(iname->iface->nbtsrv->task->event_ctx, 
+			iname,
+			timeval_add(&iname->registration_time, iname->ttl/2, 0),
+			nbtd_refresh_wins_refresh,
+			iname);
+
+	talloc_free(tmp_ctx);
+}
+
+/*
+  refresh a name with our WINS servers
+*/
+void nbtd_winsclient_refresh(struct nbtd_iface_name *iname)
+{
+	struct nbtd_interface *iface = iname->iface;
+	struct nbt_name_refresh_wins io;
+	struct composite_context *c;
+
+	/* setup a wins name refresh request */
+	io.in.name            = iname->name;
+	io.in.wins_servers    = lp_wins_server_list();
+	io.in.addresses       = nbtd_address_list(iface->nbtsrv, iname);
+	io.in.nb_flags        = iname->nb_flags;
+	io.in.ttl             = iname->ttl;
+
+	c = nbt_name_refresh_wins_send(iface->nbtsock, &io);
+	if (c == NULL) {
+		talloc_free(io.in.addresses);
+		return;
+	}
+	talloc_steal(c, io.in.addresses);
+
+	c->async.fn = nbtd_refresh_wins_handler;
+	c->async.private = iname;
+}