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 #include "param/param.h"
  27
  28 /*
  29   send a nbt name release request
  30 */
  31 _PUBLIC_ struct nbt_name_request *nbt_name_release_send(struct nbt_name_socket *nbtsock,
  32                                                struct nbt_name_release *io)
  33 {
  34         struct nbt_name_request *req;
  35         struct nbt_name_packet *packet;
  36         struct socket_address *dest;
  37
  38         packet = talloc_zero(nbtsock, struct nbt_name_packet);
  39         if (packet == NULL) return NULL;
  40
  41         packet->qdcount = 1;
  42         packet->arcount = 1;
  43         packet->operation = NBT_OPCODE_RELEASE;
  44         if (io->in.broadcast) {
  45                 packet->operation |= NBT_FLAG_BROADCAST;
  46         }
  47
  48         packet->questions = talloc_array(packet, struct nbt_name_question, 1);
  49         if (packet->questions == NULL) goto failed;
  50
  51         packet->questions[0].name           = io->in.name;
  52         packet->questions[0].question_type  = NBT_QTYPE_NETBIOS;
  53         packet->questions[0].question_class = NBT_QCLASS_IP;
  54
  55         packet->additional = talloc_array(packet, struct nbt_res_rec, 1);
  56         if (packet->additional == NULL) goto failed;
  57
  58         packet->additional[0].name                   = io->in.name;
  59         packet->additional[0].rr_type                = NBT_QTYPE_NETBIOS;
  60         packet->additional[0].rr_class               = NBT_QCLASS_IP;
  61         packet->additional[0].ttl                    = 0;
  62         packet->additional[0].rdata.netbios.length   = 6;
  63         packet->additional[0].rdata.netbios.addresses = talloc_array(packet->additional,
  64                                                                      struct nbt_rdata_address, 1);
  65         if (packet->additional[0].rdata.netbios.addresses == NULL) goto failed;
  66         packet->additional[0].rdata.netbios.addresses[0].nb_flags = io->in.nb_flags;
  67         packet->additional[0].rdata.netbios.addresses[0].ipaddr =
  68                 talloc_strdup(packet->additional, io->in.address);
  69
  70         dest = socket_address_from_strings(packet, nbtsock->sock->backend_name,
  71                                            io->in.dest_addr, io->in.dest_port);
  72         if (dest == NULL) goto failed;
  73         req = nbt_name_request_send(nbtsock, dest, packet,
  74                                     io->in.timeout, io->in.retries, false);
  75         if (req == NULL) goto failed;
  76
  77         talloc_free(packet);
  78         return req;
  79
  80 failed:
  81         talloc_free(packet);
  82         return NULL;
  83 }
  84
  85 /*
  86   wait for a release reply
  87 */
  88 _PUBLIC_ NTSTATUS nbt_name_release_recv(struct nbt_name_request *req,
  89                                TALLOC_CTX *mem_ctx, struct nbt_name_release *io)
  90 {
  91         NTSTATUS status;
  92         struct nbt_name_packet *packet;
  93
  94         status = nbt_name_request_recv(req);
  95         if (!NT_STATUS_IS_OK(status) ||
  96             req->num_replies == 0) {
  97                 talloc_free(req);
  98                 return status;
  99         }
 100
 101         packet = req->replies[0].packet;
 102         io->out.reply_from = talloc_steal(mem_ctx, req->replies[0].dest->addr);
 103
 104         if (packet->ancount != 1 ||
 105             packet->answers[0].rr_type != NBT_QTYPE_NETBIOS ||
 106             packet->answers[0].rr_class != NBT_QCLASS_IP) {
 107                 talloc_free(req);
 108                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 109         }
 110
 111         io->out.rcode = packet->operation & NBT_RCODE;
 112         io->out.name = packet->answers[0].name;
 113         if (packet->answers[0].rdata.netbios.length < 6) {
 114                 talloc_free(req);
 115                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 116         }
 117         io->out.reply_addr = talloc_steal(mem_ctx,
 118                                           packet->answers[0].rdata.netbios.addresses[0].ipaddr);
 119         talloc_steal(mem_ctx, io->out.name.name);
 120         talloc_steal(mem_ctx, io->out.name.scope);
 121
 122         talloc_free(req);
 123
 124         return NT_STATUS_OK;
 125 }
 126
 127 /*
 128   synchronous name release request
 129 */
 130 _PUBLIC_ NTSTATUS nbt_name_release(struct nbt_name_socket *nbtsock,
 131                            TALLOC_CTX *mem_ctx, struct nbt_name_release *io)
 132 {
 133         struct nbt_name_request *req = nbt_name_release_send(nbtsock, io);
 134         return nbt_name_release_recv(req, mem_ctx, io);
 135 }