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 #include "lib/socket/socket.h"
  27
  28 /*
  29   send a nbt name refresh request
  30 */
  31 struct nbt_name_request *nbt_name_refresh_send(struct nbt_name_socket *nbtsock,
  32                                                struct nbt_name_refresh *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_REFRESH;
  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                    = io->in.ttl;
  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(nbtsock, nbtsock->sock->backend_name,
  71                                            io->in.dest_addr, lp_nbt_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 refresh reply
  87 */
  88 NTSTATUS nbt_name_refresh_recv(struct nbt_name_request *req,
  89                                TALLOC_CTX *mem_ctx, struct nbt_name_refresh *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 refresh request
 129 */
 130 NTSTATUS nbt_name_refresh(struct nbt_name_socket *nbtsock,
 131                            TALLOC_CTX *mem_ctx, struct nbt_name_refresh *io)
 132 {
 133         struct nbt_name_request *req = nbt_name_refresh_send(nbtsock, io);
 134         return nbt_name_refresh_recv(req, mem_ctx, io);
 135 }
 136
 137
 138
 139 /*
 140   a wins name refresh with multiple WINS servers and multiple
 141   addresses to refresh. Try each WINS server in turn, until we get a
 142   reply for each address
 143 */
 144 struct refresh_wins_state {
 145         struct nbt_name_socket *nbtsock;
 146         struct nbt_name_refresh *io;
 147         const char **wins_servers;
 148         const char **addresses;
 149         int address_idx;
 150         struct nbt_name_request *req;
 151 };
 152
 153
 154 /*
 155   state handler for WINS multi-homed multi-server name refresh
 156 */
 157 static void name_refresh_wins_handler(struct nbt_name_request *req)
 158 {
 159         struct composite_context *c = talloc_get_type(req->async.private,
 160                                                       struct composite_context);
 161         struct refresh_wins_state *state = talloc_get_type(c->private_data,
 162                                                             struct refresh_wins_state);
 163         NTSTATUS status;
 164
 165         status = nbt_name_refresh_recv(state->req, state, state->io);
 166         if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
 167                 /* the refresh timed out - try the next WINS server */
 168                 state->wins_servers++;
 169                 state->address_idx = 0;
 170                 if (state->wins_servers[0] == NULL) {
 171                         c->state = COMPOSITE_STATE_ERROR;
 172                         c->status = status;
 173                         goto done;
 174                 }
 175                 state->io->in.dest_addr = state->wins_servers[0];
 176                 state->io->in.address   = state->addresses[0];
 177                 state->req = nbt_name_refresh_send(state->nbtsock, state->io);
 178                 if (state->req == NULL) {
 179                         c->state = COMPOSITE_STATE_ERROR;
 180                         c->status = NT_STATUS_NO_MEMORY;
 181                 } else {
 182                         state->req->async.fn      = name_refresh_wins_handler;
 183                         state->req->async.private = c;
 184                 }
 185         } else if (!NT_STATUS_IS_OK(status)) {
 186                 c->state = COMPOSITE_STATE_ERROR;
 187                 c->status = status;
 188         } else {
 189                 if (state->io->out.rcode == 0 &&
 190                     state->addresses[state->address_idx+1] != NULL) {
 191                         /* refresh our next address */
 192                         state->io->in.address = state->addresses[++(state->address_idx)];
 193                         state->req = nbt_name_refresh_send(state->nbtsock, state->io);
 194                         if (state->req == NULL) {
 195                                 c->state = COMPOSITE_STATE_ERROR;
 196                                 c->status = NT_STATUS_NO_MEMORY;
 197                         } else {
 198                                 state->req->async.fn      = name_refresh_wins_handler;
 199                                 state->req->async.private = c;
 200                         }
 201                 } else {
 202                         c->state = COMPOSITE_STATE_DONE;
 203                         c->status = NT_STATUS_OK;
 204                 }
 205         }
 206
 207 done:
 208         if (c->state >= COMPOSITE_STATE_DONE &&
 209             c->async.fn) {
 210                 c->async.fn(c);
 211         }
 212 }
 213
 214 /*
 215   the async send call for a multi-server WINS refresh
 216 */
 217 struct composite_context *nbt_name_refresh_wins_send(struct nbt_name_socket *nbtsock,
 218                                                       struct nbt_name_refresh_wins *io)
 219 {
 220         struct composite_context *c;
 221         struct refresh_wins_state *state;
 222
 223         c = talloc_zero(nbtsock, struct composite_context);
 224         if (c == NULL) goto failed;
 225
 226         state = talloc(c, struct refresh_wins_state);
 227         if (state == NULL) goto failed;
 228
 229         state->io = talloc(state, struct nbt_name_refresh);
 230         if (state->io == NULL) goto failed;
 231
 232         state->wins_servers = str_list_copy(state, io->in.wins_servers);
 233         if (state->wins_servers == NULL ||
 234             state->wins_servers[0] == NULL) goto failed;
 235
 236         state->addresses = str_list_copy(state, io->in.addresses);
 237         if (state->addresses == NULL ||
 238             state->addresses[0] == NULL) goto failed;
 239
 240         state->io->in.name            = io->in.name;
 241         state->io->in.dest_addr       = state->wins_servers[0];
 242         state->io->in.address         = io->in.addresses[0];
 243         state->io->in.nb_flags        = io->in.nb_flags;
 244         state->io->in.broadcast       = False;
 245         state->io->in.ttl             = io->in.ttl;
 246         state->io->in.timeout         = 2;
 247         state->io->in.retries         = 2;
 248
 249         state->nbtsock     = nbtsock;
 250         state->address_idx = 0;
 251
 252         state->req = nbt_name_refresh_send(nbtsock, state->io);
 253         if (state->req == NULL) goto failed;
 254
 255         state->req->async.fn      = name_refresh_wins_handler;
 256         state->req->async.private = c;
 257
 258         c->private_data = state;
 259         c->state        = COMPOSITE_STATE_IN_PROGRESS;
 260         c->event_ctx    = nbtsock->event_ctx;
 261
 262         return c;
 263
 264 failed:
 265         talloc_free(c);
 266         return NULL;
 267 }
 268
 269 /*
 270   multi-homed WINS name refresh - recv side
 271 */
 272 NTSTATUS nbt_name_refresh_wins_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
 273                                      struct nbt_name_refresh_wins *io)
 274 {
 275         NTSTATUS status;
 276         status = composite_wait(c);
 277         if (NT_STATUS_IS_OK(status)) {
 278                 struct refresh_wins_state *state =
 279                         talloc_get_type(c->private_data, struct refresh_wins_state);
 280                 io->out.wins_server = talloc_steal(mem_ctx, state->wins_servers[0]);
 281                 io->out.rcode = state->io->out.rcode;
 282         }
 283         talloc_free(c);
 284         return status;
 285 }
 286
 287 /*
 288   multi-homed WINS refresh - sync interface
 289 */
 290 NTSTATUS nbt_name_refresh_wins(struct nbt_name_socket *nbtsock,
 291                                 TALLOC_CTX *mem_ctx,
 292                                 struct nbt_name_refresh_wins *io)
 293 {
 294         struct composite_context *c = nbt_name_refresh_wins_send(nbtsock, io);
 295         return nbt_name_refresh_wins_recv(c, mem_ctx, io);
 296 }