source4/libcli/nbt/namerefresh.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    send out a name refresh 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/composite/composite.h"
  26
  27 /*
  28   send a nbt name refresh request
  29 */
  30 struct nbt_name_request *nbt_name_refresh_send(struct nbt_name_socket *nbtsock,
  31                                                struct nbt_name_refresh *io)
  32 {
  33         struct nbt_name_request *req;
  34         struct nbt_name_packet *packet;
  35         struct nbt_peer_socket 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_REFRESH;
  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                    = io->in.ttl;
  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.port = lp_nbt_port();
  70         dest.addr = io->in.dest_addr;
  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 refresh reply
  85 */
  86 NTSTATUS nbt_name_refresh_recv(struct nbt_name_request *req,
  87                                TALLOC_CTX *mem_ctx, struct nbt_name_refresh *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 refresh request
 127 */
 128 NTSTATUS nbt_name_refresh(struct nbt_name_socket *nbtsock,
 129                            TALLOC_CTX *mem_ctx, struct nbt_name_refresh *io)
 130 {
 131         struct nbt_name_request *req = nbt_name_refresh_send(nbtsock, io);
 132         return nbt_name_refresh_recv(req, mem_ctx, io);
 133 }
 134
 135
 136
 137 /*
 138   a wins name refresh with multiple WINS servers and multiple
 139   addresses to refresh. Try each WINS server in turn, until we get a
 140   reply for each address
 141 */
 142 struct refresh_wins_state {
 143         struct nbt_name_socket *nbtsock;
 144         struct nbt_name_refresh *io;
 145         const char **wins_servers;
 146         const char **addresses;
 147         int address_idx;
 148         struct nbt_name_request *req;
 149 };
 150
 151
 152 /*
 153   state handler for WINS multi-homed multi-server name refresh
 154 */
 155 static void name_refresh_wins_handler(struct nbt_name_request *req)
 156 {
 157         struct composite_context *c = talloc_get_type(req->async.private,
 158                                                       struct composite_context);
 159         struct refresh_wins_state *state = talloc_get_type(c->private_data,
 160                                                             struct refresh_wins_state);
 161         NTSTATUS status;
 162
 163         status = nbt_name_refresh_recv(state->req, state, state->io);
 164         if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
 165                 /* the refresh timed out - try the next WINS server */
 166                 state->wins_servers++;
 167                 state->address_idx = 0;
 168                 if (state->wins_servers[0] == NULL) {
 169                         c->state = COMPOSITE_STATE_ERROR;
 170                         c->status = status;
 171                         goto done;
 172                 }
 173                 state->io->in.dest_addr = state->wins_servers[0];
 174                 state->io->in.address   = state->addresses[0];
 175                 state->req = nbt_name_refresh_send(state->nbtsock, state->io);
 176                 if (state->req == NULL) {
 177                         c->state = COMPOSITE_STATE_ERROR;
 178                         c->status = NT_STATUS_NO_MEMORY;
 179                 } else {
 180                         state->req->async.fn      = name_refresh_wins_handler;
 181                         state->req->async.private = c;
 182                 }
 183         } else if (!NT_STATUS_IS_OK(status)) {
 184                 c->state = COMPOSITE_STATE_ERROR;
 185                 c->status = status;
 186         } else {
 187                 if (state->io->out.rcode == 0 &&
 188                     state->addresses[state->address_idx+1] != NULL) {
 189                         /* refresh our next address */
 190                         state->io->in.address = state->addresses[++(state->address_idx)];
 191                         state->req = nbt_name_refresh_send(state->nbtsock, state->io);
 192                         if (state->req == NULL) {
 193                                 c->state = COMPOSITE_STATE_ERROR;
 194                                 c->status = NT_STATUS_NO_MEMORY;
 195                         } else {
 196                                 state->req->async.fn      = name_refresh_wins_handler;
 197                                 state->req->async.private = c;
 198                         }
 199                 } else {
 200                         c->state = COMPOSITE_STATE_DONE;
 201                         c->status = NT_STATUS_OK;
 202                 }
 203         }
 204
 205 done:
 206         if (c->state >= COMPOSITE_STATE_DONE &&
 207             c->async.fn) {
 208                 c->async.fn(c);
 209         }
 210 }
 211
 212 /*
 213   the async send call for a multi-server WINS refresh
 214 */
 215 struct composite_context *nbt_name_refresh_wins_send(struct nbt_name_socket *nbtsock,
 216                                                       struct nbt_name_refresh_wins *io)
 217 {
 218         struct composite_context *c;
 219         struct refresh_wins_state *state;
 220
 221         c = talloc_zero(nbtsock, struct composite_context);
 222         if (c == NULL) goto failed;
 223
 224         state = talloc(c, struct refresh_wins_state);
 225         if (state == NULL) goto failed;
 226
 227         state->io = talloc(state, struct nbt_name_refresh);
 228         if (state->io == NULL) goto failed;
 229
 230         state->wins_servers = str_list_copy(state, io->in.wins_servers);
 231         if (state->wins_servers == NULL ||
 232             state->wins_servers[0] == NULL) goto failed;
 233
 234         state->addresses = str_list_copy(state, io->in.addresses);
 235         if (state->addresses == NULL ||
 236             state->addresses[0] == NULL) goto failed;
 237
 238         state->io->in.name            = io->in.name;
 239         state->io->in.dest_addr       = state->wins_servers[0];
 240         state->io->in.address         = io->in.addresses[0];
 241         state->io->in.nb_flags        = io->in.nb_flags;
 242         state->io->in.broadcast       = False;
 243         state->io->in.ttl             = io->in.ttl;
 244         state->io->in.timeout         = 2;
 245         state->io->in.retries         = 2;
 246
 247         state->nbtsock     = nbtsock;
 248         state->address_idx = 0;
 249
 250         state->req = nbt_name_refresh_send(nbtsock, state->io);
 251         if (state->req == NULL) goto failed;
 252
 253         state->req->async.fn      = name_refresh_wins_handler;
 254         state->req->async.private = c;
 255
 256         c->private_data = state;
 257         c->state        = COMPOSITE_STATE_IN_PROGRESS;
 258         c->event_ctx    = nbtsock->event_ctx;
 259
 260         return c;
 261
 262 failed:
 263         talloc_free(c);
 264         return NULL;
 265 }
 266
 267 /*
 268   multi-homed WINS name refresh - recv side
 269 */
 270 NTSTATUS nbt_name_refresh_wins_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
 271                                      struct nbt_name_refresh_wins *io)
 272 {
 273         NTSTATUS status;
 274         status = composite_wait(c);
 275         if (NT_STATUS_IS_OK(status)) {
 276                 struct refresh_wins_state *state =
 277                         talloc_get_type(c->private_data, struct refresh_wins_state);
 278                 io->out.wins_server = talloc_steal(mem_ctx, state->wins_servers[0]);
 279                 io->out.rcode = state->io->out.rcode;
 280         }
 281         talloc_free(c);
 282         return status;
 283 }
 284
 285 /*
 286   multi-homed WINS refresh - sync interface
 287 */
 288 NTSTATUS nbt_name_refresh_wins(struct nbt_name_socket *nbtsock,
 289                                 TALLOC_CTX *mem_ctx,
 290                                 struct nbt_name_refresh_wins *io)
 291 {
 292         struct composite_context *c = nbt_name_refresh_wins_send(nbtsock, io);
 293         return nbt_name_refresh_wins_recv(c, mem_ctx, io);
 294 }