1/*
2   Unix SMB/CIFS implementation.
3
4   send out a name release request
5
6   Copyright (C) Andrew Tridgell 2005
7
8   This program is free software; you can redistribute it and/or modify
9   it under the terms of the GNU General Public License as published by
10   the Free Software Foundation; either version 3 of the License, or
11   (at your option) any later version.
12
13   This program is distributed in the hope that it will be useful,
14   but WITHOUT ANY WARRANTY; without even the implied warranty of
15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16   GNU General Public License for more details.
17
18   You should have received a copy of the GNU General Public License
19   along with this program.  If not, see <http://www.gnu.org/licenses/>.
20*/
21
22#include "includes.h"
23#include "../libcli/nbt/libnbt.h"
24#include "../libcli/nbt/nbt_proto.h"
25#include "lib/socket/socket.h"
26
27/*
28  send a nbt name release request
29*/
30_PUBLIC_ struct nbt_name_request *nbt_name_release_send(struct nbt_name_socket *nbtsock,
31					       struct nbt_name_release *io)
32{
33	struct nbt_name_request *req;
34	struct nbt_name_packet *packet;
35	struct socket_address *dest;
36
37	packet = talloc_zero(nbtsock, struct nbt_name_packet);
38	if (packet == NULL) return NULL;
39
40	packet->qdcount = 1;
41	packet->arcount = 1;
42	packet->operation = NBT_OPCODE_RELEASE;
43	if (io->in.broadcast) {
44		packet->operation |= NBT_FLAG_BROADCAST;
45	}
46
47	packet->questions = talloc_array(packet, struct nbt_name_question, 1);
48	if (packet->questions == NULL) goto failed;
49
50	packet->questions[0].name           = io->in.name;
51	packet->questions[0].question_type  = NBT_QTYPE_NETBIOS;
52	packet->questions[0].question_class = NBT_QCLASS_IP;
53
54	packet->additional = talloc_array(packet, struct nbt_res_rec, 1);
55	if (packet->additional == NULL) goto failed;
56
57	packet->additional[0].name                   = io->in.name;
58	packet->additional[0].rr_type                = NBT_QTYPE_NETBIOS;
59	packet->additional[0].rr_class               = NBT_QCLASS_IP;
60	packet->additional[0].ttl                    = 0;
61	packet->additional[0].rdata.netbios.length   = 6;
62	packet->additional[0].rdata.netbios.addresses = talloc_array(packet->additional,
63								     struct nbt_rdata_address, 1);
64	if (packet->additional[0].rdata.netbios.addresses == NULL) goto failed;
65	packet->additional[0].rdata.netbios.addresses[0].nb_flags = io->in.nb_flags;
66	packet->additional[0].rdata.netbios.addresses[0].ipaddr =
67		talloc_strdup(packet->additional, io->in.address);
68
69	dest = socket_address_from_strings(packet, nbtsock->sock->backend_name,
70					   io->in.dest_addr, io->in.dest_port);
71	if (dest == NULL) goto failed;
72	req = nbt_name_request_send(nbtsock, dest, packet,
73				    io->in.timeout, io->in.retries, false);
74	if (req == NULL) goto failed;
75
76	talloc_free(packet);
77	return req;
78
79failed:
80	talloc_free(packet);
81	return NULL;
82}
83
84/*
85  wait for a release reply
86*/
87_PUBLIC_ NTSTATUS nbt_name_release_recv(struct nbt_name_request *req,
88			       TALLOC_CTX *mem_ctx, struct nbt_name_release *io)
89{
90	NTSTATUS status;
91	struct nbt_name_packet *packet;
92
93	status = nbt_name_request_recv(req);
94	if (!NT_STATUS_IS_OK(status) ||
95	    req->num_replies == 0) {
96		talloc_free(req);
97		return status;
98	}
99
100	packet = req->replies[0].packet;
101	io->out.reply_from = talloc_steal(mem_ctx, req->replies[0].dest->addr);
102
103	if (packet->ancount != 1 ||
104	    packet->answers[0].rr_type != NBT_QTYPE_NETBIOS ||
105	    packet->answers[0].rr_class != NBT_QCLASS_IP) {
106		talloc_free(req);
107		return NT_STATUS_INVALID_NETWORK_RESPONSE;
108	}
109
110	io->out.rcode = packet->operation & NBT_RCODE;
111	io->out.name = packet->answers[0].name;
112	if (packet->answers[0].rdata.netbios.length < 6) {
113		talloc_free(req);
114		return NT_STATUS_INVALID_NETWORK_RESPONSE;
115	}
116	io->out.reply_addr = talloc_steal(mem_ctx,
117					  packet->answers[0].rdata.netbios.addresses[0].ipaddr);
118	talloc_steal(mem_ctx, io->out.name.name);
119	talloc_steal(mem_ctx, io->out.name.scope);
120
121	talloc_free(req);
122
123	return NT_STATUS_OK;
124}
125
126/*
127  synchronous name release request
128*/
129_PUBLIC_ NTSTATUS nbt_name_release(struct nbt_name_socket *nbtsock,
130			   TALLOC_CTX *mem_ctx, struct nbt_name_release *io)
131{
132	struct nbt_name_request *req = nbt_name_release_send(nbtsock, io);
133	return nbt_name_release_recv(req, mem_ctx, io);
134}
135