source4/libcli/nbt/nameregister.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    send out a name registration 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 #include "libcli/raw/libcliraw.h"
  26 #include "libcli/composite/composite.h"
  27 #include "system/network.h"
  28
  29 /*
  30   send a nbt name registration request
  31 */
  32 struct nbt_name_request *nbt_name_register_send(struct nbt_name_socket *nbtsock,
  33                                                 struct nbt_name_register *io)
  34 {
  35         struct nbt_name_request *req;
  36         struct nbt_name_packet *packet;
  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_REGISTER;
  44         if (io->in.broadcast) {
  45                 packet->operation |= NBT_FLAG_BROADCAST;
  46         }
  47         if (io->in.register_demand) {
  48                 packet->operation |= NBT_FLAG_RECURSION_DESIRED;
  49         }
  50
  51         packet->questions = talloc_array(packet, struct nbt_name_question, 1);
  52         if (packet->questions == NULL) goto failed;
  53
  54         packet->questions[0].name           = io->in.name;
  55         packet->questions[0].question_type  = NBT_QTYPE_NETBIOS;
  56         packet->questions[0].question_class = NBT_QCLASS_IP;
  57
  58         packet->additional = talloc_array(packet, struct nbt_res_rec, 1);
  59         if (packet->additional == NULL) goto failed;
  60
  61         packet->additional[0].name                   = io->in.name;
  62         packet->additional[0].rr_type                = NBT_QTYPE_NETBIOS;
  63         packet->additional[0].rr_class               = NBT_QCLASS_IP;
  64         packet->additional[0].ttl                    = io->in.ttl;
  65         packet->additional[0].rdata.netbios.length   = 6;
  66         packet->additional[0].rdata.netbios.addresses = talloc_array(packet->additional,
  67                                                                      struct nbt_rdata_address, 1);
  68         if (packet->additional[0].rdata.netbios.addresses == NULL) goto failed;
  69         packet->additional[0].rdata.netbios.addresses[0].nb_flags = io->in.nb_flags;
  70         packet->additional[0].rdata.netbios.addresses[0].ipaddr   = htonl(inet_addr(io->in.address));
  71
  72         req = nbt_name_request_send(nbtsock, io->in.dest_addr, lp_nbt_port(), packet,
  73                                     timeval_current_ofs(io->in.timeout, 0), 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 registration reply
  86 */
  87 NTSTATUS nbt_name_register_recv(struct nbt_name_request *req,
  88                                 TALLOC_CTX *mem_ctx, struct nbt_name_register *io)
  89 {
  90         NTSTATUS status;
  91         struct nbt_name_packet *packet;
  92         const char *addr;
  93         struct in_addr in;
  94
  95         status = nbt_name_request_recv(req);
  96         if (!NT_STATUS_IS_OK(status) ||
  97             req->num_replies == 0) {
  98                 talloc_free(req);
  99                 return status;
 100         }
 101
 102         packet = req->replies[0].packet;
 103         io->out.reply_from = talloc_steal(mem_ctx, req->replies[0].reply_addr);
 104
 105         if (packet->ancount != 1 ||
 106             packet->answers[0].rr_type != NBT_QTYPE_NETBIOS ||
 107             packet->answers[0].rr_class != NBT_QCLASS_IP) {
 108                 talloc_free(req);
 109                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 110         }
 111
 112         io->out.rcode = packet->operation & NBT_RCODE;
 113         io->out.name = packet->answers[0].name;
 114         if (packet->answers[0].rdata.netbios.length < 6) {
 115                 talloc_free(req);
 116                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 117         }
 118         in.s_addr = htonl(packet->answers[0].rdata.netbios.addresses[0].ipaddr);
 119         addr = inet_ntoa(in);
 120         if (addr == NULL) {
 121                 talloc_free(req);
 122                 return NT_STATUS_NO_MEMORY;
 123         }
 124         io->out.reply_addr = talloc_strdup(mem_ctx, addr);
 125         talloc_steal(mem_ctx, io->out.name.name);
 126         talloc_steal(mem_ctx, io->out.name.scope);
 127
 128         talloc_free(req);
 129
 130         return NT_STATUS_OK;
 131 }
 132
 133 /*
 134   synchronous name registration request
 135 */
 136 NTSTATUS nbt_name_register(struct nbt_name_socket *nbtsock,
 137                            TALLOC_CTX *mem_ctx, struct nbt_name_register *io)
 138 {
 139         struct nbt_name_request *req = nbt_name_register_send(nbtsock, io);
 140         return nbt_name_register_recv(req, mem_ctx, io);
 141 }
 142
 143
 144 /*
 145   a 4 step broadcast registration. 3 lots of name registration requests, followed by
 146   a name registration demand
 147 */
 148 struct register_bcast_state {
 149         struct nbt_name_socket *nbtsock;
 150         struct nbt_name_register *io;
 151         int num_sends;
 152         struct nbt_name_request *req;
 153 };
 154
 155
 156 /*
 157   state handler for 4 stage name registration
 158 */
 159 static void name_register_handler(struct nbt_name_request *req)
 160 {
 161         struct composite_context *c = talloc_get_type(req->async.private, struct composite_context);
 162         struct register_bcast_state *state = talloc_get_type(c->private, struct register_bcast_state);
 163         NTSTATUS status;
 164
 165         status = nbt_name_register_recv(state->req, state, state->io);
 166         if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
 167                 /* the registration timed out - good, send the next one */
 168                 state->num_sends++;
 169                 if (state->num_sends == 4) {
 170                         /* all done */
 171                         c->state = SMBCLI_REQUEST_DONE;
 172                         c->status = NT_STATUS_OK;
 173                         goto done;
 174                 }
 175                 if (state->num_sends == 3) {
 176                         state->io->in.register_demand = True;
 177                 }
 178                 state->req = nbt_name_register_send(state->nbtsock, state->io);
 179                 if (state->req == NULL) {
 180                         c->state = SMBCLI_REQUEST_ERROR;
 181                         c->status = NT_STATUS_NO_MEMORY;
 182                 } else {
 183                         state->req->async.fn      = name_register_handler;
 184                         state->req->async.private = c;
 185                 }
 186         } else if (!NT_STATUS_IS_OK(status)) {
 187                 c->state = SMBCLI_REQUEST_ERROR;
 188                 c->status = status;
 189         } else {
 190                 c->state = SMBCLI_REQUEST_ERROR;
 191                 c->status = NT_STATUS_CONFLICTING_ADDRESSES;
 192                 DEBUG(3,("Name registration conflict from %s for %s<%02x> with ip %s - rcode %d\n",
 193                          state->io->out.reply_from,
 194                          state->io->out.name.name,
 195                          state->io->out.name.type,
 196                          state->io->out.reply_addr,
 197                          state->io->out.rcode));
 198         }
 199
 200 done:
 201         if (c->state >= SMBCLI_REQUEST_DONE &&
 202             c->async.fn) {
 203                 c->async.fn(c);
 204         }
 205 }
 206
 207 /*
 208   the async send call for a 4 stage name registration
 209 */
 210 struct composite_context *nbt_name_register_bcast_send(struct nbt_name_socket *nbtsock,
 211                                                       struct nbt_name_register_bcast *io)
 212 {
 213         struct composite_context *c;
 214         struct register_bcast_state *state;
 215
 216         c = talloc_zero(nbtsock, struct composite_context);
 217         if (c == NULL) goto failed;
 218
 219         state = talloc(c, struct register_bcast_state);
 220         if (state == NULL) goto failed;
 221
 222         state->io = talloc(state, struct nbt_name_register);
 223         if (state->io == NULL) goto failed;
 224
 225         state->io->in.name            = io->in.name;
 226         state->io->in.dest_addr       = io->in.dest_addr;
 227         state->io->in.address         = io->in.address;
 228         state->io->in.nb_flags        = io->in.nb_flags;
 229         state->io->in.register_demand = False;
 230         state->io->in.broadcast       = True;
 231         state->io->in.ttl             = io->in.ttl;
 232         state->io->in.timeout         = 1;
 233
 234         state->num_sends = 0;
 235         state->nbtsock = nbtsock;
 236
 237         state->req = nbt_name_register_send(nbtsock, state->io);
 238         if (state->req == NULL) goto failed;
 239
 240         state->req->async.fn      = name_register_handler;
 241         state->req->async.private = c;
 242
 243         c->private   = state;
 244         c->state     = SMBCLI_REQUEST_SEND;
 245         c->event_ctx = nbtsock->event_ctx;
 246
 247         return c;
 248
 249 failed:
 250         talloc_free(c);
 251         return NULL;
 252 }
 253
 254 /*
 255   broadcast 4 part name register - recv
 256 */
 257 NTSTATUS nbt_name_register_bcast_recv(struct composite_context *c)
 258 {
 259         NTSTATUS status;
 260         status = composite_wait(c);
 261         talloc_free(c);
 262         return status;
 263 }
 264
 265 /*
 266   broadcast 4 part name register - sync interface
 267 */
 268 NTSTATUS nbt_name_register_bcast(struct nbt_name_socket *nbtsock,
 269                                  struct nbt_name_register_bcast *io)
 270 {
 271         struct composite_context *c = nbt_name_register_bcast_send(nbtsock, io);
 272         return nbt_name_register_bcast_recv(c);
 273 }