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-rw-r--r--source4/nbt_server/wins/winsclient.c284
1 files changed, 284 insertions, 0 deletions
diff --git a/source4/nbt_server/wins/winsclient.c b/source4/nbt_server/wins/winsclient.c
new file mode 100644
index 0000000..c1e7f9a
--- /dev/null
+++ b/source4/nbt_server/wins/winsclient.c
@@ -0,0 +1,284 @@
+/*
+ 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 3 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, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "nbt_server/nbt_server.h"
+#include "nbt_server/wins/winsserver.h"
+#include "libcli/composite/composite.h"
+#include "lib/events/events.h"
+#include "librpc/gen_ndr/ndr_nbt.h"
+#include "samba/service_task.h"
+#include "param/param.h"
+
+/* we send WINS client requests using our primary network interface
+*/
+static struct nbt_name_socket *wins_socket(struct nbtd_interface *iface)
+{
+ struct nbtd_server *nbtsrv = iface->nbtsrv;
+ return nbtsrv->interfaces->nbtsock;
+}
+
+
+static void nbtd_wins_refresh(struct tevent_context *ev, struct tevent_timer *te,
+ struct timeval t, void *private_data);
+
+/*
+ retry a WINS name registration
+*/
+static void nbtd_wins_register_retry(struct tevent_context *ev, struct tevent_timer *te,
+ struct timeval t, void *private_data)
+{
+ struct nbtd_iface_name *iname = talloc_get_type(private_data, struct nbtd_iface_name);
+ nbtd_winsclient_register(iname);
+}
+
+/*
+ start a timer to refresh this name
+*/
+static void nbtd_wins_start_refresh_timer(struct nbtd_iface_name *iname)
+{
+ uint32_t refresh_time;
+ uint32_t max_refresh_time = lpcfg_parm_int(iname->iface->nbtsrv->task->lp_ctx, NULL, "nbtd", "max_refresh_time", 7200);
+
+ refresh_time = MIN(max_refresh_time, iname->ttl/2);
+
+ tevent_add_timer(iname->iface->nbtsrv->task->event_ctx,
+ iname,
+ timeval_add(&iname->registration_time, refresh_time, 0),
+ nbtd_wins_refresh, iname);
+}
+
+struct nbtd_wins_refresh_state {
+ struct nbtd_iface_name *iname;
+ struct nbt_name_refresh_wins io;
+};
+
+/*
+ called when a wins name refresh has completed
+*/
+static void nbtd_wins_refresh_handler(struct tevent_req *subreq)
+{
+ NTSTATUS status;
+ struct nbtd_wins_refresh_state *state =
+ tevent_req_callback_data(subreq,
+ struct nbtd_wins_refresh_state);
+ struct nbtd_iface_name *iname = state->iname;
+
+ status = nbt_name_refresh_wins_recv(subreq, state, &state->io);
+ TALLOC_FREE(subreq);
+ if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
+ /* our WINS server is dead - start registration over
+ from scratch */
+ DEBUG(2,("Failed to refresh %s with WINS server %s\n",
+ nbt_name_string(state, &iname->name), iname->wins_server));
+ talloc_free(state);
+ nbtd_winsclient_register(iname);
+ return;
+ }
+
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(1,("Name refresh failure with WINS for %s - %s\n",
+ nbt_name_string(state, &iname->name), nt_errstr(status)));
+ talloc_free(state);
+ return;
+ }
+
+ if (state->io.out.rcode != 0) {
+ DEBUG(1,("WINS server %s rejected name refresh of %s - %s\n",
+ state->io.out.wins_server,
+ nbt_name_string(state, &iname->name),
+ nt_errstr(nbt_rcode_to_ntstatus(state->io.out.rcode))));
+ iname->nb_flags |= NBT_NM_CONFLICT;
+ talloc_free(state);
+ return;
+ }
+
+ DEBUG(4,("Refreshed name %s with WINS server %s\n",
+ nbt_name_string(state, &iname->name), iname->wins_server));
+ /* success - start a periodic name refresh */
+ iname->nb_flags |= NBT_NM_ACTIVE;
+ if (iname->wins_server) {
+ /*
+ * talloc_free() would generate a warning,
+ * so steal it into the tmp context
+ */
+ talloc_steal(state, iname->wins_server);
+ }
+ iname->wins_server = talloc_move(iname, &state->io.out.wins_server);
+ iname->registration_time = timeval_current();
+
+ talloc_free(state);
+
+ nbtd_wins_start_refresh_timer(iname);
+}
+
+
+/*
+ refresh a WINS name registration
+*/
+static void nbtd_wins_refresh(struct tevent_context *ev, struct tevent_timer *te,
+ struct timeval t, void *private_data)
+{
+ struct nbtd_iface_name *iname = talloc_get_type(private_data, struct nbtd_iface_name);
+ struct nbtd_interface *iface = iname->iface;
+ struct nbt_name_socket *nbtsock = wins_socket(iface);
+ struct tevent_req *subreq;
+ struct nbtd_wins_refresh_state *state;
+ char **l;
+
+ state = talloc_zero(iname, struct nbtd_wins_refresh_state);
+ if (state == NULL) {
+ return;
+ }
+
+ state->iname = iname;
+
+ /* setup a wins name refresh request */
+ state->io.in.name = iname->name;
+ l = str_list_make_single(state, iname->wins_server);
+ state->io.in.wins_servers = discard_const_p(const char *, l);
+ state->io.in.wins_port = lpcfg_nbt_port(iface->nbtsrv->task->lp_ctx);
+ state->io.in.addresses = nbtd_address_list(iface, state);
+ state->io.in.nb_flags = iname->nb_flags;
+ state->io.in.ttl = iname->ttl;
+
+ if (!state->io.in.addresses) {
+ talloc_free(state);
+ return;
+ }
+
+ subreq = nbt_name_refresh_wins_send(state, ev, nbtsock, &state->io);
+ if (subreq == NULL) {
+ talloc_free(state);
+ return;
+ }
+
+ tevent_req_set_callback(subreq, nbtd_wins_refresh_handler, state);
+}
+
+struct nbtd_wins_register_state {
+ struct nbtd_iface_name *iname;
+ struct nbt_name_register_wins io;
+};
+
+/*
+ called when a wins name register has completed
+*/
+static void nbtd_wins_register_handler(struct tevent_req *subreq)
+{
+ NTSTATUS status;
+ struct nbtd_wins_register_state *state =
+ tevent_req_callback_data(subreq,
+ struct nbtd_wins_register_state);
+ struct nbtd_iface_name *iname = state->iname;
+
+ status = nbt_name_register_wins_recv(subreq, state, &state->io);
+ TALLOC_FREE(subreq);
+ if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
+ /* none of the WINS servers responded - try again
+ periodically */
+ int wins_retry_time = lpcfg_parm_int(iname->iface->nbtsrv->task->lp_ctx, NULL, "nbtd", "wins_retry", 300);
+ tevent_add_timer(iname->iface->nbtsrv->task->event_ctx,
+ iname,
+ timeval_current_ofs(wins_retry_time, 0),
+ nbtd_wins_register_retry,
+ iname);
+ talloc_free(state);
+ return;
+ }
+
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(1,("Name register failure with WINS for %s - %s\n",
+ nbt_name_string(state, &iname->name), nt_errstr(status)));
+ talloc_free(state);
+ return;
+ }
+
+ if (state->io.out.rcode != 0) {
+ DEBUG(1,("WINS server %s rejected name register of %s - %s\n",
+ state->io.out.wins_server,
+ nbt_name_string(state, &iname->name),
+ nt_errstr(nbt_rcode_to_ntstatus(state->io.out.rcode))));
+ iname->nb_flags |= NBT_NM_CONFLICT;
+ talloc_free(state);
+ return;
+ }
+
+ /* success - start a periodic name refresh */
+ iname->nb_flags |= NBT_NM_ACTIVE;
+ if (iname->wins_server) {
+ /*
+ * talloc_free() would generate a warning,
+ * so steal it into the tmp context
+ */
+ talloc_steal(state, iname->wins_server);
+ }
+ iname->wins_server = talloc_move(iname, &state->io.out.wins_server);
+
+ iname->registration_time = timeval_current();
+
+ DEBUG(3,("Registered %s with WINS server %s\n",
+ nbt_name_string(state, &iname->name), iname->wins_server));
+
+ talloc_free(state);
+
+ nbtd_wins_start_refresh_timer(iname);
+}
+
+/*
+ register a name with our WINS servers
+*/
+void nbtd_winsclient_register(struct nbtd_iface_name *iname)
+{
+ struct nbtd_interface *iface = iname->iface;
+ struct nbt_name_socket *nbtsock = wins_socket(iface);
+ struct nbtd_wins_register_state *state;
+ struct tevent_req *subreq;
+
+ state = talloc_zero(iname, struct nbtd_wins_register_state);
+ if (state == NULL) {
+ return;
+ }
+
+ state->iname = iname;
+
+ /* setup a wins name register request */
+ state->io.in.name = iname->name;
+ state->io.in.wins_port = lpcfg_nbt_port(iface->nbtsrv->task->lp_ctx);
+ state->io.in.wins_servers = lpcfg_wins_server_list(iface->nbtsrv->task->lp_ctx);
+ state->io.in.addresses = nbtd_address_list(iface, state);
+ state->io.in.nb_flags = iname->nb_flags;
+ state->io.in.ttl = iname->ttl;
+
+ if (state->io.in.addresses == NULL) {
+ talloc_free(state);
+ return;
+ }
+
+ subreq = nbt_name_register_wins_send(state, iface->nbtsrv->task->event_ctx,
+ nbtsock, &state->io);
+ if (subreq == NULL) {
+ talloc_free(state);
+ return;
+ }
+
+ tevent_req_set_callback(subreq, nbtd_wins_register_handler, state);
+}
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