source4/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 "lib/socket/socket.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         struct socket_address *dest;
  35
  36         packet = talloc_zero(nbtsock, struct nbt_name_packet);
  37         if (packet == NULL) return NULL;
  38
  39         packet->qdcount = 1;
  40         packet->arcount = 1;
  41         packet->operation = NBT_OPCODE_RELEASE;
  42         if (io->in.broadcast) {
  43                 packet->operation |= NBT_FLAG_BROADCAST;
  44         }
  45
  46         packet->questions = talloc_array(packet, struct nbt_name_question, 1);
  47         if (packet->questions == NULL) goto failed;
  48
  49         packet->questions[0].name           = io->in.name;
  50         packet->questions[0].question_type  = NBT_QTYPE_NETBIOS;
  51         packet->questions[0].question_class = NBT_QCLASS_IP;
  52
  53         packet->additional = talloc_array(packet, struct nbt_res_rec, 1);
  54         if (packet->additional == NULL) goto failed;
  55
  56         packet->additional[0].name                   = io->in.name;
  57         packet->additional[0].rr_type                = NBT_QTYPE_NETBIOS;
  58         packet->additional[0].rr_class               = NBT_QCLASS_IP;
  59         packet->additional[0].ttl                    = 0;
  60         packet->additional[0].rdata.netbios.length   = 6;
  61         packet->additional[0].rdata.netbios.addresses = talloc_array(packet->additional,
  62                                                                      struct nbt_rdata_address, 1);
  63         if (packet->additional[0].rdata.netbios.addresses == NULL) goto failed;
  64         packet->additional[0].rdata.netbios.addresses[0].nb_flags = io->in.nb_flags;
  65         packet->additional[0].rdata.netbios.addresses[0].ipaddr =
  66                 talloc_strdup(packet->additional, io->in.address);
  67
  68         dest = socket_address_from_strings(packet, nbtsock->sock->backend_name,
  69                                            io->in.dest_addr, lp_nbt_port());
  70         if (dest == NULL) goto failed;
  71         req = nbt_name_request_send(nbtsock, dest, packet,
  72                                     io->in.timeout, io->in.retries, False);
  73         if (req == NULL) goto failed;
  74
  75         talloc_free(packet);
  76         return req;
  77
  78 failed:
  79         talloc_free(packet);
  80         return NULL;
  81 }
  82
  83 /*
  84   wait for a release reply
  85 */
  86 NTSTATUS nbt_name_release_recv(struct nbt_name_request *req,
  87                                TALLOC_CTX *mem_ctx, struct nbt_name_release *io)
  88 {
  89         NTSTATUS status;
  90         struct nbt_name_packet *packet;
  91
  92         status = nbt_name_request_recv(req);
  93         if (!NT_STATUS_IS_OK(status) ||
  94             req->num_replies == 0) {
  95                 talloc_free(req);
  96                 return status;
  97         }
  98
  99         packet = req->replies[0].packet;
 100         io->out.reply_from = talloc_steal(mem_ctx, req->replies[0].dest->addr);
 101
 102         if (packet->ancount != 1 ||
 103             packet->answers[0].rr_type != NBT_QTYPE_NETBIOS ||
 104             packet->answers[0].rr_class != NBT_QCLASS_IP) {
 105                 talloc_free(req);
 106                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 107         }
 108
 109         io->out.rcode = packet->operation & NBT_RCODE;
 110         io->out.name = packet->answers[0].name;
 111         if (packet->answers[0].rdata.netbios.length < 6) {
 112                 talloc_free(req);
 113                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 114         }
 115         io->out.reply_addr = talloc_steal(mem_ctx,
 116                                           packet->answers[0].rdata.netbios.addresses[0].ipaddr);
 117         talloc_steal(mem_ctx, io->out.name.name);
 118         talloc_steal(mem_ctx, io->out.name.scope);
 119
 120         talloc_free(req);
 121
 122         return NT_STATUS_OK;
 123 }
 124
 125 /*
 126   synchronous name release request
 127 */
 128 NTSTATUS nbt_name_release(struct nbt_name_socket *nbtsock,
 129                            TALLOC_CTX *mem_ctx, struct nbt_name_release *io)
 130 {
 131         struct nbt_name_request *req = nbt_name_release_send(nbtsock, io);
 132         return nbt_name_release_recv(req, mem_ctx, io);
 133 }