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/*
Unix SMB/CIFS implementation.
general name resolution interface
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 "lib/events/events.h"
#include "libcli/composite/composite.h"
#include "libcli/resolve/resolve.h"
#include "librpc/gen_ndr/ndr_nbt.h"
#include "param/param.h"
struct resolve_state {
struct nbt_name name;
const char **methods;
struct composite_context *creq;
const char *reply_addr;
};
static struct composite_context *setup_next_method(struct composite_context *c);
/* pointers to the resolver backends */
static const struct resolve_method {
const char *name;
struct composite_context *(*send_fn)(TALLOC_CTX *mem_ctx, struct event_context *, struct nbt_name *);
NTSTATUS (*recv_fn)(struct composite_context *, TALLOC_CTX *, const char **);
} resolve_methods[] = {
{ "bcast", resolve_name_bcast_send, resolve_name_bcast_recv },
{ "wins", resolve_name_wins_send, resolve_name_wins_recv },
{ "host", resolve_name_host_send, resolve_name_host_recv }
};
/*
find a matching backend
*/
static const struct resolve_method *find_method(const char *name)
{
int i;
if (name == NULL) return NULL;
for (i=0;i<ARRAY_SIZE(resolve_methods);i++) {
if (strcasecmp(name, resolve_methods[i].name) == 0) {
return &resolve_methods[i];
}
}
return NULL;
}
/*
handle completion of one name resolve method
*/
static void resolve_handler(struct composite_context *creq)
{
struct composite_context *c = (struct composite_context *)creq->async.private_data;
struct resolve_state *state = talloc_get_type(c->private_data, struct resolve_state);
const struct resolve_method *method = find_method(state->methods[0]);
c->status = method->recv_fn(creq, state, &state->reply_addr);
if (!NT_STATUS_IS_OK(c->status)) {
state->methods++;
state->creq = setup_next_method(c);
if (state->creq != NULL) {
return;
}
}
if (!NT_STATUS_IS_OK(c->status)) {
c->state = COMPOSITE_STATE_ERROR;
} else {
c->state = COMPOSITE_STATE_DONE;
}
if (c->async.fn) {
c->async.fn(c);
}
}
static struct composite_context *setup_next_method(struct composite_context *c)
{
struct resolve_state *state = talloc_get_type(c->private_data, struct resolve_state);
struct composite_context *creq = NULL;
do {
const struct resolve_method *method = find_method(state->methods[0]);
if (method) {
creq = method->send_fn(c, c->event_ctx, &state->name);
}
if (creq == NULL && state->methods[0]) state->methods++;
} while (!creq && state->methods[0]);
if (creq) {
creq->async.fn = resolve_handler;
creq->async.private_data = c;
}
return creq;
}
/*
general name resolution - async send
*/
struct composite_context *resolve_name_send(struct nbt_name *name, struct event_context *event_ctx,
const char **methods)
{
struct composite_context *c;
struct resolve_state *state;
c = composite_create(event_ctx, event_ctx);
if (c == NULL) return NULL;
if (methods == NULL) {
composite_error(c, NT_STATUS_INVALID_PARAMETER);
return c;
}
if (event_ctx == NULL) {
c->event_ctx = event_context_init(c);
} else {
c->event_ctx = talloc_reference(c, event_ctx);
}
if (composite_nomem(c->event_ctx, c)) return c;
state = talloc(c, struct resolve_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->methods = str_list_copy(state, methods);
if (composite_nomem(state->methods, c)) return c;
if (is_ipaddress(state->name.name) ||
strcasecmp(state->name.name, "localhost") == 0) {
struct ipv4_addr ip = interpret_addr2(state->name.name);
state->reply_addr = talloc_strdup(state, sys_inet_ntoa(ip));
if (composite_nomem(state->reply_addr, c)) return c;
composite_done(c);
return c;
}
state->creq = setup_next_method(c);
if (composite_nomem(state->creq, c)) return c;
return c;
}
/*
general name resolution method - recv side
*/
NTSTATUS resolve_name_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 resolve_state *state = talloc_get_type(c->private_data, struct resolve_state);
*reply_addr = talloc_steal(mem_ctx, state->reply_addr);
}
talloc_free(c);
return status;
}
/*
general name resolution - sync call
*/
NTSTATUS resolve_name(struct nbt_name *name, TALLOC_CTX *mem_ctx, const char **reply_addr,
struct event_context *ev)
{
struct composite_context *c = resolve_name_send(name, ev,
lp_name_resolve_order());
return resolve_name_recv(c, mem_ctx, reply_addr);
}
/* Initialise a struct nbt_name with a NULL scope */
void make_nbt_name(struct nbt_name *nbt, const char *name, int type)
{
nbt->name = name;
nbt->scope = NULL;
nbt->type = type;
}
/* Initialise a struct nbt_name with a NBT_NAME_CLIENT (0x00) name */
void make_nbt_name_client(struct nbt_name *nbt, const char *name)
{
make_nbt_name(nbt, name, NBT_NAME_CLIENT);
}
/* Initialise a struct nbt_name with a NBT_NAME_SERVER (0x20) name */
void make_nbt_name_server(struct nbt_name *nbt, const char *name)
{
make_nbt_name(nbt, name, NBT_NAME_SERVER);
}
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