1 files changed, 302 insertions, 0 deletions

diff --git a/libcli/nbt/namerefresh.c b/libcli/nbt/namerefresh.c
new file mode 100644
index 0000000000..77f9cbd45c
--- /dev/null
+++ b/libcli/nbt/namerefresh.c
@@ -0,0 +1,302 @@
+/*
+   Unix SMB/CIFS implementation.
+
+   send out a name refresh request
+
+   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 "../libcli/nbt/libnbt.h"
+#include "../libcli/nbt/nbt_proto.h"
+#include "libcli/composite/composite.h"
+#include "lib/socket/socket.h"
+#include "param/param.h"
+
+/*
+  send a nbt name refresh request
+*/
+struct nbt_name_request *nbt_name_refresh_send(struct nbt_name_socket *nbtsock,
+					       struct nbt_name_refresh *io)
+{
+	struct nbt_name_request *req;
+	struct nbt_name_packet *packet;
+	struct socket_address *dest;
+
+	packet = talloc_zero(nbtsock, struct nbt_name_packet);
+	if (packet == NULL) return NULL;
+
+	packet->qdcount = 1;
+	packet->arcount = 1;
+	packet->operation = NBT_OPCODE_REFRESH;
+	if (io->in.broadcast) {
+		packet->operation |= NBT_FLAG_BROADCAST;
+	}
+
+	packet->questions = talloc_array(packet, struct nbt_name_question, 1);
+	if (packet->questions == NULL) goto failed;
+
+	packet->questions[0].name           = io->in.name;
+	packet->questions[0].question_type  = NBT_QTYPE_NETBIOS;
+	packet->questions[0].question_class = NBT_QCLASS_IP;
+
+	packet->additional = talloc_array(packet, struct nbt_res_rec, 1);
+	if (packet->additional == NULL) goto failed;
+
+	packet->additional[0].name                   = io->in.name;
+	packet->additional[0].rr_type                = NBT_QTYPE_NETBIOS;
+	packet->additional[0].rr_class               = NBT_QCLASS_IP;
+	packet->additional[0].ttl                    = io->in.ttl;
+	packet->additional[0].rdata.netbios.length   = 6;
+	packet->additional[0].rdata.netbios.addresses = talloc_array(packet->additional,
+								     struct nbt_rdata_address, 1);
+	if (packet->additional[0].rdata.netbios.addresses == NULL) goto failed;
+	packet->additional[0].rdata.netbios.addresses[0].nb_flags = io->in.nb_flags;
+	packet->additional[0].rdata.netbios.addresses[0].ipaddr =
+		talloc_strdup(packet->additional, io->in.address);
+
+	dest = socket_address_from_strings(nbtsock,
+					   nbtsock->sock->backend_name,
+					   io->in.dest_addr, io->in.dest_port);
+	if (dest == NULL) goto failed;
+	req = nbt_name_request_send(nbtsock, dest, packet,
+				    io->in.timeout, io->in.retries, false);
+	if (req == NULL) goto failed;
+
+	talloc_free(packet);
+	return req;
+
+failed:
+	talloc_free(packet);
+	return NULL;
+}
+
+/*
+  wait for a refresh reply
+*/
+_PUBLIC_ NTSTATUS nbt_name_refresh_recv(struct nbt_name_request *req,
+			       TALLOC_CTX *mem_ctx, struct nbt_name_refresh *io)
+{
+	NTSTATUS status;
+	struct nbt_name_packet *packet;
+
+	status = nbt_name_request_recv(req);
+	if (!NT_STATUS_IS_OK(status) ||
+	    req->num_replies == 0) {
+		talloc_free(req);
+		return status;
+	}
+
+	packet = req->replies[0].packet;
+	io->out.reply_from = talloc_steal(mem_ctx, req->replies[0].dest->addr);
+
+	if (packet->ancount != 1 ||
+	    packet->answers[0].rr_type != NBT_QTYPE_NETBIOS ||
+	    packet->answers[0].rr_class != NBT_QCLASS_IP) {
+		talloc_free(req);
+		return NT_STATUS_INVALID_NETWORK_RESPONSE;
+	}
+
+	io->out.rcode = packet->operation & NBT_RCODE;
+	io->out.name = packet->answers[0].name;
+	if (packet->answers[0].rdata.netbios.length < 6) {
+		talloc_free(req);
+		return NT_STATUS_INVALID_NETWORK_RESPONSE;
+	}
+	io->out.reply_addr = talloc_steal(mem_ctx,
+					  packet->answers[0].rdata.netbios.addresses[0].ipaddr);
+	talloc_steal(mem_ctx, io->out.name.name);
+	talloc_steal(mem_ctx, io->out.name.scope);
+
+	talloc_free(req);
+
+	return NT_STATUS_OK;
+}
+
+/*
+  synchronous name refresh request
+*/
+_PUBLIC_ NTSTATUS nbt_name_refresh(struct nbt_name_socket *nbtsock,
+			   TALLOC_CTX *mem_ctx, struct nbt_name_refresh *io)
+{
+	struct nbt_name_request *req = nbt_name_refresh_send(nbtsock, io);
+	return nbt_name_refresh_recv(req, mem_ctx, io);
+}
+
+
+
+/**
+  a wins name refresh with multiple WINS servers and multiple
+  addresses to refresh. Try each WINS server in turn, until we get a
+  reply for each address
+*/
+struct refresh_wins_state {
+	struct nbt_name_socket *nbtsock;
+	struct nbt_name_refresh *io;
+	const char **wins_servers;
+	uint16_t wins_port;
+	const char **addresses;
+	int address_idx;
+	struct nbt_name_request *req;
+};
+
+
+/**
+  state handler for WINS multi-homed multi-server name refresh
+*/
+static void name_refresh_wins_handler(struct nbt_name_request *req)
+{
+	struct composite_context *c = talloc_get_type(req->async.private_data,
+						      struct composite_context);
+	struct refresh_wins_state *state = talloc_get_type(c->private_data,
+							    struct refresh_wins_state);
+	NTSTATUS status;
+
+	status = nbt_name_refresh_recv(state->req, state, state->io);
+	if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
+		/* the refresh timed out - try the next WINS server */
+		state->wins_servers++;
+		state->address_idx = 0;
+		if (state->wins_servers[0] == NULL) {
+			c->state = COMPOSITE_STATE_ERROR;
+			c->status = status;
+			goto done;
+		}
+		state->io->in.dest_addr = state->wins_servers[0];
+		state->io->in.dest_port = state->wins_port;
+		state->io->in.address   = state->addresses[0];
+		state->req = nbt_name_refresh_send(state->nbtsock, state->io);
+		if (state->req == NULL) {
+			c->state = COMPOSITE_STATE_ERROR;
+			c->status = NT_STATUS_NO_MEMORY;
+		} else {
+			state->req->async.fn      = name_refresh_wins_handler;
+			state->req->async.private_data = c;
+		}
+	} else if (!NT_STATUS_IS_OK(status)) {
+		c->state = COMPOSITE_STATE_ERROR;
+		c->status = status;
+	} else {
+		if (state->io->out.rcode == 0 &&
+		    state->addresses[state->address_idx+1] != NULL) {
+			/* refresh our next address */
+			state->io->in.address = state->addresses[++(state->address_idx)];
+			state->req = nbt_name_refresh_send(state->nbtsock, state->io);
+			if (state->req == NULL) {
+				c->state = COMPOSITE_STATE_ERROR;
+				c->status = NT_STATUS_NO_MEMORY;
+			} else {
+				state->req->async.fn      = name_refresh_wins_handler;
+				state->req->async.private_data = c;
+			}
+		} else {
+			c->state = COMPOSITE_STATE_DONE;
+			c->status = NT_STATUS_OK;
+		}
+	}
+
+done:
+	if (c->state >= COMPOSITE_STATE_DONE &&
+	    c->async.fn) {
+		c->async.fn(c);
+	}
+}
+
+/**
+  the async send call for a multi-server WINS refresh
+*/
+_PUBLIC_ struct composite_context *nbt_name_refresh_wins_send(struct nbt_name_socket *nbtsock,
+						      struct nbt_name_refresh_wins *io)
+{
+	struct composite_context *c;
+	struct refresh_wins_state *state;
+
+	c = talloc_zero(nbtsock, struct composite_context);
+	if (c == NULL) goto failed;
+
+	state = talloc(c, struct refresh_wins_state);
+	if (state == NULL) goto failed;
+
+	state->io = talloc(state, struct nbt_name_refresh);
+	if (state->io == NULL) goto failed;
+
+	state->wins_port = io->in.wins_port;
+	state->wins_servers = (const char **)str_list_copy(state, io->in.wins_servers);
+	if (state->wins_servers == NULL ||
+	    state->wins_servers[0] == NULL) goto failed;
+
+	state->addresses = (const char **)str_list_copy(state, io->in.addresses);
+	if (state->addresses == NULL ||
+	    state->addresses[0] == NULL) goto failed;
+
+	state->io->in.name            = io->in.name;
+	state->io->in.dest_addr       = state->wins_servers[0];
+	state->io->in.dest_port       = state->wins_port;
+	state->io->in.address         = io->in.addresses[0];
+	state->io->in.nb_flags        = io->in.nb_flags;
+	state->io->in.broadcast       = false;
+	state->io->in.ttl             = io->in.ttl;
+	state->io->in.timeout         = 2;
+	state->io->in.retries         = 2;
+
+	state->nbtsock     = nbtsock;
+	state->address_idx = 0;
+
+	state->req = nbt_name_refresh_send(nbtsock, state->io);
+	if (state->req == NULL) goto failed;
+
+	state->req->async.fn      = name_refresh_wins_handler;
+	state->req->async.private_data = c;
+
+	c->private_data	= state;
+	c->state	= COMPOSITE_STATE_IN_PROGRESS;
+	c->event_ctx	= nbtsock->event_ctx;
+
+	return c;
+
+failed:
+	talloc_free(c);
+	return NULL;
+}
+
+/*
+  multi-homed WINS name refresh - recv side
+*/
+_PUBLIC_ NTSTATUS nbt_name_refresh_wins_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
+				     struct nbt_name_refresh_wins *io)
+{
+	NTSTATUS status;
+	status = composite_wait(c);
+	if (NT_STATUS_IS_OK(status)) {
+		struct refresh_wins_state *state =
+			talloc_get_type(c->private_data, struct refresh_wins_state);
+		io->out.wins_server = talloc_steal(mem_ctx, state->wins_servers[0]);
+		io->out.rcode = state->io->out.rcode;
+	}
+	talloc_free(c);
+	return status;
+}
+
+/*
+  multi-homed WINS refresh - sync interface
+*/
+_PUBLIC_ NTSTATUS nbt_name_refresh_wins(struct nbt_name_socket *nbtsock,
+				TALLOC_CTX *mem_ctx,
+				struct nbt_name_refresh_wins *io)
+{
+	struct composite_context *c = nbt_name_refresh_wins_send(nbtsock, io);
+	return nbt_name_refresh_wins_recv(c, mem_ctx, io);
+}