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
  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_REFRESH;
  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                    = io->in.ttl;
  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         req = nbt_name_request_send(nbtsock, io->in.dest_addr, lp_nbt_port(), packet,
  69                                     io->in.timeout, io->in.retries, False);
  70         if (req == NULL) goto failed;
  71
  72         talloc_free(packet);
  73         return req;
  74
  75 failed:
  76         talloc_free(packet);
  77         return NULL;
  78 }
  79
  80 /*
  81   wait for a refresh reply
  82 */
  83 NTSTATUS nbt_name_refresh_recv(struct nbt_name_request *req,
  84                                TALLOC_CTX *mem_ctx, struct nbt_name_refresh *io)
  85 {
  86         NTSTATUS status;
  87         struct nbt_name_packet *packet;
  88
  89         status = nbt_name_request_recv(req);
  90         if (!NT_STATUS_IS_OK(status) ||
  91             req->num_replies == 0) {
  92                 talloc_free(req);
  93                 return status;
  94         }
  95
  96         packet = req->replies[0].packet;
  97         io->out.reply_from = talloc_steal(mem_ctx, req->replies[0].reply_addr);
  98
  99         if (packet->ancount != 1 ||
 100             packet->answers[0].rr_type != NBT_QTYPE_NETBIOS ||
 101             packet->answers[0].rr_class != NBT_QCLASS_IP) {
 102                 talloc_free(req);
 103                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 104         }
 105
 106         io->out.rcode = packet->operation & NBT_RCODE;
 107         io->out.name = packet->answers[0].name;
 108         if (packet->answers[0].rdata.netbios.length < 6) {
 109                 talloc_free(req);
 110                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 111         }
 112         io->out.reply_addr = talloc_steal(mem_ctx,
 113                                           packet->answers[0].rdata.netbios.addresses[0].ipaddr);
 114         talloc_steal(mem_ctx, io->out.name.name);
 115         talloc_steal(mem_ctx, io->out.name.scope);
 116
 117         talloc_free(req);
 118
 119         return NT_STATUS_OK;
 120 }
 121
 122 /*
 123   synchronous name refresh request
 124 */
 125 NTSTATUS nbt_name_refresh(struct nbt_name_socket *nbtsock,
 126                            TALLOC_CTX *mem_ctx, struct nbt_name_refresh *io)
 127 {
 128         struct nbt_name_request *req = nbt_name_refresh_send(nbtsock, io);
 129         return nbt_name_refresh_recv(req, mem_ctx, io);
 130 }
 131
 132
 133
 134 /*
 135   a wins name refresh with multiple WINS servers and multiple
 136   addresses to refresh. Try each WINS server in turn, until we get a
 137   reply for each address
 138 */
 139 struct refresh_wins_state {
 140         struct nbt_name_socket *nbtsock;
 141         struct nbt_name_refresh *io;
 142         const char **wins_servers;
 143         const char **addresses;
 144         int address_idx;
 145         struct nbt_name_request *req;
 146 };
 147
 148
 149 /*
 150   state handler for WINS multi-homed multi-server name refresh
 151 */
 152 static void name_refresh_wins_handler(struct nbt_name_request *req)
 153 {
 154         struct composite_context *c = talloc_get_type(req->async.private,
 155                                                       struct composite_context);
 156         struct refresh_wins_state *state = talloc_get_type(c->private_data,
 157                                                             struct refresh_wins_state);
 158         NTSTATUS status;
 159
 160         status = nbt_name_refresh_recv(state->req, state, state->io);
 161         if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
 162                 /* the refresh timed out - try the next WINS server */
 163                 state->wins_servers++;
 164                 state->address_idx = 0;
 165                 if (state->wins_servers[0] == NULL) {
 166                         c->state = COMPOSITE_STATE_ERROR;
 167                         c->status = status;
 168                         goto done;
 169                 }
 170                 state->io->in.dest_addr = state->wins_servers[0];
 171                 state->io->in.address   = state->addresses[0];
 172                 state->req = nbt_name_refresh_send(state->nbtsock, state->io);
 173                 if (state->req == NULL) {
 174                         c->state = COMPOSITE_STATE_ERROR;
 175                         c->status = NT_STATUS_NO_MEMORY;
 176                 } else {
 177                         state->req->async.fn      = name_refresh_wins_handler;
 178                         state->req->async.private = c;
 179                 }
 180         } else if (!NT_STATUS_IS_OK(status)) {
 181                 c->state = COMPOSITE_STATE_ERROR;
 182                 c->status = status;
 183         } else {
 184                 if (state->io->out.rcode == 0 &&
 185                     state->addresses[state->address_idx+1] != NULL) {
 186                         /* refresh our next address */
 187                         state->io->in.address = state->addresses[++(state->address_idx)];
 188                         state->req = nbt_name_refresh_send(state->nbtsock, state->io);
 189                         if (state->req == NULL) {
 190                                 c->state = COMPOSITE_STATE_ERROR;
 191                                 c->status = NT_STATUS_NO_MEMORY;
 192                         } else {
 193                                 state->req->async.fn      = name_refresh_wins_handler;
 194                                 state->req->async.private = c;
 195                         }
 196                 } else {
 197                         c->state = COMPOSITE_STATE_DONE;
 198                         c->status = NT_STATUS_OK;
 199                 }
 200         }
 201
 202 done:
 203         if (c->state >= COMPOSITE_STATE_DONE &&
 204             c->async.fn) {
 205                 c->async.fn(c);
 206         }
 207 }
 208
 209 /*
 210   the async send call for a multi-server WINS refresh
 211 */
 212 struct composite_context *nbt_name_refresh_wins_send(struct nbt_name_socket *nbtsock,
 213                                                       struct nbt_name_refresh_wins *io)
 214 {
 215         struct composite_context *c;
 216         struct refresh_wins_state *state;
 217
 218         c = talloc_zero(nbtsock, struct composite_context);
 219         if (c == NULL) goto failed;
 220
 221         state = talloc(c, struct refresh_wins_state);
 222         if (state == NULL) goto failed;
 223
 224         state->io = talloc(state, struct nbt_name_refresh);
 225         if (state->io == NULL) goto failed;
 226
 227         state->wins_servers = str_list_copy(state, io->in.wins_servers);
 228         if (state->wins_servers == NULL ||
 229             state->wins_servers[0] == NULL) goto failed;
 230
 231         state->addresses = str_list_copy(state, io->in.addresses);
 232         if (state->addresses == NULL ||
 233             state->addresses[0] == NULL) goto failed;
 234
 235         state->io->in.name            = io->in.name;
 236         state->io->in.dest_addr       = state->wins_servers[0];
 237         state->io->in.address         = io->in.addresses[0];
 238         state->io->in.nb_flags        = io->in.nb_flags;
 239         state->io->in.broadcast       = False;
 240         state->io->in.ttl             = io->in.ttl;
 241         state->io->in.timeout         = 2;
 242         state->io->in.retries         = 2;
 243
 244         state->nbtsock     = nbtsock;
 245         state->address_idx = 0;
 246
 247         state->req = nbt_name_refresh_send(nbtsock, state->io);
 248         if (state->req == NULL) goto failed;
 249
 250         state->req->async.fn      = name_refresh_wins_handler;
 251         state->req->async.private = c;
 252
 253         c->private_data = state;
 254         c->state        = COMPOSITE_STATE_IN_PROGRESS;
 255         c->event_ctx    = nbtsock->event_ctx;
 256
 257         return c;
 258
 259 failed:
 260         talloc_free(c);
 261         return NULL;
 262 }
 263
 264 /*
 265   multi-homed WINS name refresh - recv side
 266 */
 267 NTSTATUS nbt_name_refresh_wins_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
 268                                      struct nbt_name_refresh_wins *io)
 269 {
 270         NTSTATUS status;
 271         status = composite_wait(c);
 272         if (NT_STATUS_IS_OK(status)) {
 273                 struct refresh_wins_state *state =
 274                         talloc_get_type(c->private_data, struct refresh_wins_state);
 275                 io->out.wins_server = talloc_steal(mem_ctx, state->wins_servers[0]);
 276                 io->out.rcode = state->io->out.rcode;
 277         }
 278         talloc_free(c);
 279         return status;
 280 }
 281
 282 /*
 283   multi-homed WINS refresh - sync interface
 284 */
 285 NTSTATUS nbt_name_refresh_wins(struct nbt_name_socket *nbtsock,
 286                                 TALLOC_CTX *mem_ctx,
 287                                 struct nbt_name_refresh_wins *io)
 288 {
 289         struct composite_context *c = nbt_name_refresh_wins_send(nbtsock, io);
 290         return nbt_name_refresh_wins_recv(c, mem_ctx, io);
 291 }