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/*
Unix SMB/CIFS implementation.
nbt list of addresses name resolution module
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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
TODO: we should lower the timeout, and add retries for each name
*/
#include "includes.h"
#include "libcli/composite/composite.h"
#include "system/network.h"
#include "lib/socket/netif.h"
#include "librpc/gen_ndr/ndr_nbt.h"
#include "libcli/nbt/libnbt.h"
struct nbtlist_state {
struct nbt_name name;
struct nbt_name_socket *nbtsock;
int num_queries;
struct nbt_name_request **queries;
struct nbt_name_query *io_queries;
const char *reply_addr;
};
/*
handle events during nbtlist name resolution
*/
static void nbtlist_handler(struct nbt_name_request *req)
{
struct composite_context *c = talloc_get_type(req->async.private,
struct composite_context);
struct nbtlist_state *state = talloc_get_type(c->private_data, struct nbtlist_state);
struct nbt_name_query *q;
int i;
for (i=0;i<state->num_queries;i++) {
if (req == state->queries[i]) break;
}
if (i == state->num_queries) {
/* not for us?! */
composite_error(c, NT_STATUS_INTERNAL_ERROR);
return;
}
q = &state->io_queries[i];
c->status = nbt_name_query_recv(req, state, q);
/* free the network resource directly */
talloc_free(state->nbtsock);
if (!composite_is_ok(c)) return;
if (state->io_queries[i].out.num_addrs < 1) {
composite_error(c, NT_STATUS_UNEXPECTED_NETWORK_ERROR);
return;
}
/* favor a local address if possible */
state->reply_addr = NULL;
for (i=0;i<q->out.num_addrs;i++) {
if (iface_is_local(q->out.reply_addrs[i])) {
state->reply_addr = talloc_steal(state,
q->out.reply_addrs[i]);
break;
}
}
if (state->reply_addr == NULL) {
state->reply_addr = talloc_steal(state,
q->out.reply_addrs[0]);
}
composite_done(c);
}
/*
nbtlist name resolution method - async send
*/
struct composite_context *resolve_name_nbtlist_send(TALLOC_CTX *mem_ctx,
struct event_context *event_ctx,
struct nbt_name *name,
const char **address_list,
BOOL broadcast,
BOOL wins_lookup)
{
struct composite_context *c;
struct nbtlist_state *state;
int i;
c = composite_create(event_ctx, event_ctx);
if (c == NULL) return NULL;
c->event_ctx = talloc_reference(c, event_ctx);
if (composite_nomem(c->event_ctx, c)) return c;
state = talloc(c, struct nbtlist_state);
if (composite_nomem(state, c)) return c;
c->private_data = state;
c->status = nbt_name_dup(state, name, &state->name);
if (!composite_is_ok(c)) return c;
state->name.name = strupper_talloc(state, state->name.name);
if (composite_nomem(state->name.name, c)) return c;
if (state->name.scope) {
state->name.scope = strupper_talloc(state, state->name.scope);
if (composite_nomem(state->name.scope, c)) return c;
}
/*
* we can't push long names on the wire,
* so bail out here to give a useful error message
*/
if (strlen(state->name.name) > 15) {
composite_error(c, NT_STATUS_OBJECT_NAME_NOT_FOUND);
return c;
}
state->nbtsock = nbt_name_socket_init(state, event_ctx);
if (composite_nomem(state->nbtsock, c)) return c;
/* count the address_list size */
for (i=0;address_list[i];i++) /* noop */ ;
state->num_queries = i;
state->io_queries = talloc_array(state, struct nbt_name_query, state->num_queries);
if (composite_nomem(state->io_queries, c)) return c;
state->queries = talloc_array(state, struct nbt_name_request *, state->num_queries);
if (composite_nomem(state->queries, c)) return c;
for (i=0;i<state->num_queries;i++) {
state->io_queries[i].in.name = state->name;
state->io_queries[i].in.dest_addr = talloc_strdup(state->io_queries, address_list[i]);
if (composite_nomem(state->io_queries[i].in.dest_addr, c)) return c;
state->io_queries[i].in.broadcast = broadcast;
state->io_queries[i].in.wins_lookup = wins_lookup;
state->io_queries[i].in.timeout = lp_parm_int(-1, "nbt", "timeout", 1);
state->io_queries[i].in.retries = 2;
state->queries[i] = nbt_name_query_send(state->nbtsock, &state->io_queries[i]);
if (composite_nomem(state->queries[i], c)) return c;
state->queries[i]->async.fn = nbtlist_handler;
state->queries[i]->async.private = c;
}
return c;
}
/*
nbt list of addresses name resolution method - recv side
*/
NTSTATUS resolve_name_nbtlist_recv(struct composite_context *c,
TALLOC_CTX *mem_ctx, const char **reply_addr)
{
NTSTATUS status;
status = composite_wait(c);
if (NT_STATUS_IS_OK(status)) {
struct nbtlist_state *state = talloc_get_type(c->private_data, struct nbtlist_state);
*reply_addr = talloc_steal(mem_ctx, state->reply_addr);
}
talloc_free(c);
return status;
}
/*
nbt list of addresses name resolution method - sync call
*/
NTSTATUS resolve_name_nbtlist(struct nbt_name *name,
TALLOC_CTX *mem_ctx,
const char **address_list,
BOOL broadcast, BOOL wins_lookup,
const char **reply_addr)
{
struct composite_context *c = resolve_name_nbtlist_send(mem_ctx, NULL, name, address_list,
broadcast, wins_lookup);
return resolve_name_nbtlist_recv(c, mem_ctx, reply_addr);
}
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