source/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 2 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, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23 #include "includes.h"
  24 #include "libcli/nbt/libnbt.h"
  25
  26 /*
  27   send a nbt name release request
  28 */
  29 struct nbt_name_request *nbt_name_release_send(struct nbt_name_socket *nbtsock,
  30                                                struct nbt_name_release *io)
  31 {
  32         struct nbt_name_request *req;
  33         struct nbt_name_packet *packet;
  34
  35         packet = talloc_zero(nbtsock, struct nbt_name_packet);
  36         if (packet == NULL) return NULL;
  37
  38         packet->qdcount = 1;
  39         packet->arcount = 1;
  40         packet->operation = NBT_OPCODE_RELEASE;
  41         if (io->in.broadcast) {
  42                 packet->operation |= NBT_FLAG_BROADCAST;
  43         }
  44
  45         packet->questions = talloc_array(packet, struct nbt_name_question, 1);
  46         if (packet->questions == NULL) goto failed;
  47
  48         packet->questions[0].name           = io->in.name;
  49         packet->questions[0].question_type  = NBT_QTYPE_NETBIOS;
  50         packet->questions[0].question_class = NBT_QCLASS_IP;
  51
  52         packet->additional = talloc_array(packet, struct nbt_res_rec, 1);
  53         if (packet->additional == NULL) goto failed;
  54
  55         packet->additional[0].name                   = io->in.name;
  56         packet->additional[0].rr_type                = NBT_QTYPE_NETBIOS;
  57         packet->additional[0].rr_class               = NBT_QCLASS_IP;
  58         packet->additional[0].ttl                    = 0;
  59         packet->additional[0].rdata.netbios.length   = 6;
  60         packet->additional[0].rdata.netbios.addresses = talloc_array(packet->additional,
  61                                                                      struct nbt_rdata_address, 1);
  62         if (packet->additional[0].rdata.netbios.addresses == NULL) goto failed;
  63         packet->additional[0].rdata.netbios.addresses[0].nb_flags = io->in.nb_flags;
  64         packet->additional[0].rdata.netbios.addresses[0].ipaddr =
  65                 talloc_strdup(packet->additional, io->in.address);
  66
  67         req = nbt_name_request_send(nbtsock, io->in.dest_addr, lp_nbt_port(), packet,
  68                                     io->in.timeout, io->in.retries, False);
  69         if (req == NULL) goto failed;
  70
  71         talloc_free(packet);
  72         return req;
  73
  74 failed:
  75         talloc_free(packet);
  76         return NULL;
  77 }
  78
  79 /*
  80   wait for a release reply
  81 */
  82 NTSTATUS nbt_name_release_recv(struct nbt_name_request *req,
  83                                TALLOC_CTX *mem_ctx, struct nbt_name_release *io)
  84 {
  85         NTSTATUS status;
  86         struct nbt_name_packet *packet;
  87
  88         status = nbt_name_request_recv(req);
  89         if (!NT_STATUS_IS_OK(status) ||
  90             req->num_replies == 0) {
  91                 talloc_free(req);
  92                 return status;
  93         }
  94
  95         packet = req->replies[0].packet;
  96         io->out.reply_from = talloc_steal(mem_ctx, req->replies[0].reply_addr);
  97
  98         if (packet->ancount != 1 ||
  99             packet->answers[0].rr_type != NBT_QTYPE_NETBIOS ||
 100             packet->answers[0].rr_class != NBT_QCLASS_IP) {
 101                 talloc_free(req);
 102                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 103         }
 104
 105         io->out.rcode = packet->operation & NBT_RCODE;
 106         io->out.name = packet->answers[0].name;
 107         if (packet->answers[0].rdata.netbios.length < 6) {
 108                 talloc_free(req);
 109                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 110         }
 111         io->out.reply_addr = talloc_steal(mem_ctx,
 112                                           packet->answers[0].rdata.netbios.addresses[0].ipaddr);
 113         talloc_steal(mem_ctx, io->out.name.name);
 114         talloc_steal(mem_ctx, io->out.name.scope);
 115
 116         talloc_free(req);
 117
 118         return NT_STATUS_OK;
 119 }
 120
 121 /*
 122   synchronous name release request
 123 */
 124 NTSTATUS nbt_name_release(struct nbt_name_socket *nbtsock,
 125                            TALLOC_CTX *mem_ctx, struct nbt_name_release *io)
 126 {
 127         struct nbt_name_request *req = nbt_name_release_send(nbtsock, io);
 128         return nbt_name_release_recv(req, mem_ctx, io);
 129 }