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/*
Unix SMB/CIFS implementation.
send out a name registration request
Copyright (C) Andrew Tridgell 2005
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "libcli/nbt/libnbt.h"
#include "libcli/composite/composite.h"
#include "lib/socket/socket.h"
#include "librpc/gen_ndr/ndr_nbt.h"
#include "param/param.h"
/*
send a nbt name registration request
*/
struct nbt_name_request *nbt_name_register_send(struct nbt_name_socket *nbtsock,
struct nbt_name_register *io)
{
struct nbt_name_request *req;
struct nbt_name_packet *packet;
struct socket_address *dest;
packet = talloc_zero(nbtsock, struct nbt_name_packet);
if (packet == NULL) return NULL;
packet->qdcount = 1;
packet->arcount = 1;
if (io->in.multi_homed) {
packet->operation = NBT_OPCODE_MULTI_HOME_REG;
} else {
packet->operation = NBT_OPCODE_REGISTER;
}
if (io->in.broadcast) {
packet->operation |= NBT_FLAG_BROADCAST;
}
if (io->in.register_demand) {
packet->operation |= NBT_FLAG_RECURSION_DESIRED;
}
packet->questions = talloc_array(packet, struct nbt_name_question, 1);
if (packet->questions == NULL) goto failed;
packet->questions[0].name = io->in.name;
packet->questions[0].question_type = NBT_QTYPE_NETBIOS;
packet->questions[0].question_class = NBT_QCLASS_IP;
packet->additional = talloc_array(packet, struct nbt_res_rec, 1);
if (packet->additional == NULL) goto failed;
packet->additional[0].name = io->in.name;
packet->additional[0].rr_type = NBT_QTYPE_NETBIOS;
packet->additional[0].rr_class = NBT_QCLASS_IP;
packet->additional[0].ttl = io->in.ttl;
packet->additional[0].rdata.netbios.length = 6;
packet->additional[0].rdata.netbios.addresses = talloc_array(packet->additional,
struct nbt_rdata_address, 1);
if (packet->additional[0].rdata.netbios.addresses == NULL) goto failed;
packet->additional[0].rdata.netbios.addresses[0].nb_flags = io->in.nb_flags;
packet->additional[0].rdata.netbios.addresses[0].ipaddr =
talloc_strdup(packet->additional, io->in.address);
if (packet->additional[0].rdata.netbios.addresses[0].ipaddr == NULL) goto failed;
dest = socket_address_from_strings(packet, nbtsock->sock->backend_name,
io->in.dest_addr, lp_nbt_port());
if (dest == NULL) goto failed;
req = nbt_name_request_send(nbtsock, dest, packet,
io->in.timeout, io->in.retries, False);
if (req == NULL) goto failed;
talloc_free(packet);
return req;
failed:
talloc_free(packet);
return NULL;
}
/*
wait for a registration reply
*/
NTSTATUS nbt_name_register_recv(struct nbt_name_request *req,
TALLOC_CTX *mem_ctx, struct nbt_name_register *io)
{
NTSTATUS status;
struct nbt_name_packet *packet;
status = nbt_name_request_recv(req);
if (!NT_STATUS_IS_OK(status) ||
req->num_replies == 0) {
talloc_free(req);
return status;
}
packet = req->replies[0].packet;
io->out.reply_from = talloc_steal(mem_ctx, req->replies[0].dest->addr);
if (packet->ancount != 1 ||
packet->answers[0].rr_type != NBT_QTYPE_NETBIOS ||
packet->answers[0].rr_class != NBT_QCLASS_IP) {
talloc_free(req);
return NT_STATUS_INVALID_NETWORK_RESPONSE;
}
io->out.rcode = packet->operation & NBT_RCODE;
io->out.name = packet->answers[0].name;
if (packet->answers[0].rdata.netbios.length < 6) {
talloc_free(req);
return NT_STATUS_INVALID_NETWORK_RESPONSE;
}
io->out.reply_addr = talloc_steal(mem_ctx,
packet->answers[0].rdata.netbios.addresses[0].ipaddr);
talloc_steal(mem_ctx, io->out.name.name);
talloc_steal(mem_ctx, io->out.name.scope);
talloc_free(req);
return NT_STATUS_OK;
}
/*
synchronous name registration request
*/
NTSTATUS nbt_name_register(struct nbt_name_socket *nbtsock,
TALLOC_CTX *mem_ctx, struct nbt_name_register *io)
{
struct nbt_name_request *req = nbt_name_register_send(nbtsock, io);
return nbt_name_register_recv(req, mem_ctx, io);
}
/*
a 4 step broadcast registration. 3 lots of name registration requests, followed by
a name registration demand
*/
struct register_bcast_state {
struct nbt_name_socket *nbtsock;
struct nbt_name_register *io;
struct nbt_name_request *req;
};
/*
state handler for 4 stage name registration
*/
static void name_register_bcast_handler(struct nbt_name_request *req)
{
struct composite_context *c = talloc_get_type(req->async.private, struct composite_context);
struct register_bcast_state *state = talloc_get_type(c->private_data, struct register_bcast_state);
NTSTATUS status;
status = nbt_name_register_recv(state->req, state, state->io);
if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
if (state->io->in.register_demand == True) {
/* all done */
c->state = COMPOSITE_STATE_DONE;
c->status = NT_STATUS_OK;
goto done;
}
/* the registration timed out - good, send the demand */
state->io->in.register_demand = True;
state->io->in.retries = 0;
state->req = nbt_name_register_send(state->nbtsock, state->io);
if (state->req == NULL) {
c->state = COMPOSITE_STATE_ERROR;
c->status = NT_STATUS_NO_MEMORY;
} else {
state->req->async.fn = name_register_bcast_handler;
state->req->async.private = c;
}
} else if (!NT_STATUS_IS_OK(status)) {
c->state = COMPOSITE_STATE_ERROR;
c->status = status;
} else {
c->state = COMPOSITE_STATE_ERROR;
c->status = NT_STATUS_CONFLICTING_ADDRESSES;
DEBUG(3,("Name registration conflict from %s for %s with ip %s - rcode %d\n",
state->io->out.reply_from,
nbt_name_string(state, &state->io->out.name),
state->io->out.reply_addr,
state->io->out.rcode));
}
done:
if (c->state >= COMPOSITE_STATE_DONE &&
c->async.fn) {
c->async.fn(c);
}
}
/*
the async send call for a 4 stage name registration
*/
struct composite_context *nbt_name_register_bcast_send(struct nbt_name_socket *nbtsock,
struct nbt_name_register_bcast *io)
{
struct composite_context *c;
struct register_bcast_state *state;
c = talloc_zero(nbtsock, struct composite_context);
if (c == NULL) goto failed;
state = talloc(c, struct register_bcast_state);
if (state == NULL) goto failed;
state->io = talloc(state, struct nbt_name_register);
if (state->io == NULL) goto failed;
state->io->in.name = io->in.name;
state->io->in.dest_addr = io->in.dest_addr;
state->io->in.address = io->in.address;
state->io->in.nb_flags = io->in.nb_flags;
state->io->in.register_demand = False;
state->io->in.broadcast = True;
state->io->in.multi_homed = False;
state->io->in.ttl = io->in.ttl;
state->io->in.timeout = 1;
state->io->in.retries = 2;
state->nbtsock = nbtsock;
state->req = nbt_name_register_send(nbtsock, state->io);
if (state->req == NULL) goto failed;
state->req->async.fn = name_register_bcast_handler;
state->req->async.private = c;
c->private_data = state;
c->state = COMPOSITE_STATE_IN_PROGRESS;
c->event_ctx = nbtsock->event_ctx;
return c;
failed:
talloc_free(c);
return NULL;
}
/*
broadcast 4 part name register - recv
*/
NTSTATUS nbt_name_register_bcast_recv(struct composite_context *c)
{
NTSTATUS status;
status = composite_wait(c);
talloc_free(c);
return status;
}
/*
broadcast 4 part name register - sync interface
*/
NTSTATUS nbt_name_register_bcast(struct nbt_name_socket *nbtsock,
struct nbt_name_register_bcast *io)
{
struct composite_context *c = nbt_name_register_bcast_send(nbtsock, io);
return nbt_name_register_bcast_recv(c);
}
/*
a wins name register with multiple WINS servers and multiple
addresses to register. Try each WINS server in turn, until we get a
reply for each address
*/
struct register_wins_state {
struct nbt_name_socket *nbtsock;
struct nbt_name_register *io;
const char **wins_servers;
const char **addresses;
int address_idx;
struct nbt_name_request *req;
};
/*
state handler for WINS multi-homed multi-server name register
*/
static void name_register_wins_handler(struct nbt_name_request *req)
{
struct composite_context *c = talloc_get_type(req->async.private,
struct composite_context);
struct register_wins_state *state = talloc_get_type(c->private_data,
struct register_wins_state);
NTSTATUS status;
status = nbt_name_register_recv(state->req, state, state->io);
if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
/* the register timed out - try the next WINS server */
state->wins_servers++;
state->address_idx = 0;
if (state->wins_servers[0] == NULL) {
c->state = COMPOSITE_STATE_ERROR;
c->status = status;
goto done;
}
state->io->in.dest_addr = state->wins_servers[0];
state->io->in.address = state->addresses[0];
state->req = nbt_name_register_send(state->nbtsock, state->io);
if (state->req == NULL) {
c->state = COMPOSITE_STATE_ERROR;
c->status = NT_STATUS_NO_MEMORY;
} else {
state->req->async.fn = name_register_wins_handler;
state->req->async.private = c;
}
} else if (!NT_STATUS_IS_OK(status)) {
c->state = COMPOSITE_STATE_ERROR;
c->status = status;
} else {
if (state->io->out.rcode == 0 &&
state->addresses[state->address_idx+1] != NULL) {
/* register our next address */
state->io->in.address = state->addresses[++(state->address_idx)];
state->req = nbt_name_register_send(state->nbtsock, state->io);
if (state->req == NULL) {
c->state = COMPOSITE_STATE_ERROR;
c->status = NT_STATUS_NO_MEMORY;
} else {
state->req->async.fn = name_register_wins_handler;
state->req->async.private = c;
}
} else {
c->state = COMPOSITE_STATE_DONE;
c->status = NT_STATUS_OK;
}
}
done:
if (c->state >= COMPOSITE_STATE_DONE &&
c->async.fn) {
c->async.fn(c);
}
}
/*
the async send call for a multi-server WINS register
*/
struct composite_context *nbt_name_register_wins_send(struct nbt_name_socket *nbtsock,
struct nbt_name_register_wins *io)
{
struct composite_context *c;
struct register_wins_state *state;
c = talloc_zero(nbtsock, struct composite_context);
if (c == NULL) goto failed;
state = talloc(c, struct register_wins_state);
if (state == NULL) goto failed;
state->io = talloc(state, struct nbt_name_register);
if (state->io == NULL) goto failed;
state->wins_servers = str_list_copy(state, io->in.wins_servers);
if (state->wins_servers == NULL ||
state->wins_servers[0] == NULL) goto failed;
state->addresses = str_list_copy(state, io->in.addresses);
if (state->addresses == NULL ||
state->addresses[0] == NULL) goto failed;
state->io->in.name = io->in.name;
state->io->in.dest_addr = state->wins_servers[0];
state->io->in.address = io->in.addresses[0];
state->io->in.nb_flags = io->in.nb_flags;
state->io->in.broadcast = False;
state->io->in.register_demand = False;
state->io->in.multi_homed = (io->in.nb_flags & NBT_NM_GROUP)?False:True;
state->io->in.ttl = io->in.ttl;
state->io->in.timeout = 3;
state->io->in.retries = 2;
state->nbtsock = nbtsock;
state->address_idx = 0;
state->req = nbt_name_register_send(nbtsock, state->io);
if (state->req == NULL) goto failed;
state->req->async.fn = name_register_wins_handler;
state->req->async.private = c;
c->private_data = state;
c->state = COMPOSITE_STATE_IN_PROGRESS;
c->event_ctx = nbtsock->event_ctx;
return c;
failed:
talloc_free(c);
return NULL;
}
/*
multi-homed WINS name register - recv side
*/
NTSTATUS nbt_name_register_wins_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
struct nbt_name_register_wins *io)
{
NTSTATUS status;
status = composite_wait(c);
if (NT_STATUS_IS_OK(status)) {
struct register_wins_state *state =
talloc_get_type(c->private_data, struct register_wins_state);
io->out.wins_server = talloc_steal(mem_ctx, state->wins_servers[0]);
io->out.rcode = state->io->out.rcode;
}
talloc_free(c);
return status;
}
/*
multi-homed WINS register - sync interface
*/
NTSTATUS nbt_name_register_wins(struct nbt_name_socket *nbtsock,
TALLOC_CTX *mem_ctx,
struct nbt_name_register_wins *io)
{
struct composite_context *c = nbt_name_register_wins_send(nbtsock, io);
return nbt_name_register_wins_recv(c, mem_ctx, io);
}
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