libcli/nbt/namerelease.c

   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
  79 failed:
  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 }