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/*
Unix SMB/CIFS implementation.
implements a non-blocking connect operation that is aware of the samba4
events system
Copyright (C) Andrew Tridgell 2005
Copyright (C) Volker Lendecke 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/socket/socket.h"
#include "lib/events/events.h"
#include "libcli/composite/composite.h"
#include "libcli/resolve/resolve.h"
struct connect_state {
struct socket_context *sock;
const struct socket_address *my_address;
const struct socket_address *server_address;
uint32_t flags;
};
static void socket_connect_handler(struct event_context *ev,
struct fd_event *fde,
uint16_t flags, void *private);
static void continue_resolve_name(struct composite_context *ctx);
static void continue_socket_connect(struct composite_context *creq);
/*
call the real socket_connect() call, and setup event handler
*/
static void socket_send_connect(struct composite_context *result)
{
struct composite_context *creq;
struct fd_event *fde;
struct connect_state *state = talloc_get_type(result->private_data,
struct connect_state);
creq = talloc_zero(state, struct composite_context);
if (composite_nomem(creq, result)) return;
creq->state = COMPOSITE_STATE_IN_PROGRESS;
creq->event_ctx = result->event_ctx;
creq->async.fn = continue_socket_connect;
creq->async.private_data = result;
result->status = socket_connect(state->sock,
state->my_address,
state->server_address,
state->flags);
if (NT_STATUS_IS_ERR(result->status) &&
!NT_STATUS_EQUAL(result->status,
NT_STATUS_MORE_PROCESSING_REQUIRED)) {
composite_error(result, result->status);
return;
}
fde = event_add_fd(result->event_ctx, result,
socket_get_fd(state->sock),
EVENT_FD_READ|EVENT_FD_WRITE,
socket_connect_handler, result);
composite_nomem(fde, result);
}
/*
send a socket connect, potentially doing some name resolution first
*/
struct composite_context *socket_connect_send(struct socket_context *sock,
struct socket_address *my_address,
struct socket_address *server_address,
uint32_t flags,
struct resolve_context *resolve_ctx,
struct event_context *event_ctx)
{
struct composite_context *result;
struct connect_state *state;
result = talloc_zero(sock, struct composite_context);
if (result == NULL) return NULL;
result->state = COMPOSITE_STATE_IN_PROGRESS;
result->event_ctx = event_ctx;
state = talloc_zero(result, struct connect_state);
if (composite_nomem(state, result)) return result;
result->private_data = state;
state->sock = talloc_reference(state, sock);
if (composite_nomem(state->sock, result)) return result;
if (my_address) {
void *ref = talloc_reference(state, my_address);
if (composite_nomem(ref, result)) {
return result;
}
state->my_address = my_address;
}
{
void *ref = talloc_reference(state, server_address);
if (composite_nomem(ref, result)) {
return result;
}
state->server_address = server_address;
}
state->flags = flags;
set_blocking(socket_get_fd(sock), false);
if (resolve_ctx != NULL && server_address->addr && strcmp(sock->backend_name, "ipv4") == 0) {
struct nbt_name name;
struct composite_context *creq;
make_nbt_name_client(&name, server_address->addr);
creq = resolve_name_send(resolve_ctx, &name, result->event_ctx);
if (composite_nomem(creq, result)) return result;
composite_continue(result, creq, continue_resolve_name, result);
return result;
}
socket_send_connect(result);
return result;
}
/*
handle write events on connect completion
*/
static void socket_connect_handler(struct event_context *ev,
struct fd_event *fde,
uint16_t flags, void *private)
{
struct composite_context *result =
talloc_get_type(private, struct composite_context);
struct connect_state *state = talloc_get_type(result->private_data,
struct connect_state);
result->status = socket_connect_complete(state->sock, state->flags);
if (!composite_is_ok(result)) return;
composite_done(result);
}
/*
recv name resolution reply then send the connect
*/
static void continue_resolve_name(struct composite_context *creq)
{
struct composite_context *result = talloc_get_type(creq->async.private_data,
struct composite_context);
struct connect_state *state = talloc_get_type(result->private_data, struct connect_state);
const char *addr;
result->status = resolve_name_recv(creq, state, &addr);
if (!composite_is_ok(result)) return;
state->server_address = socket_address_from_strings(state, state->sock->backend_name,
addr, state->server_address->port);
if (composite_nomem(state->server_address, result)) return;
socket_send_connect(result);
}
/*
called when a connect has finished. Complete the top level composite context
*/
static void continue_socket_connect(struct composite_context *creq)
{
struct composite_context *result = talloc_get_type(creq->async.private_data,
struct composite_context);
result->status = creq->status;
if (!composite_is_ok(result)) return;
composite_done(result);
}
/*
wait for a socket_connect_send() to finish
*/
NTSTATUS socket_connect_recv(struct composite_context *result)
{
NTSTATUS status = composite_wait(result);
talloc_free(result);
return status;
}
/*
like socket_connect() but takes an event context, doing a semi-async connect
*/
NTSTATUS socket_connect_ev(struct socket_context *sock,
struct socket_address *my_address,
struct socket_address *server_address,
uint32_t flags, struct resolve_context *resolve_ctx,
struct event_context *ev)
{
struct composite_context *ctx;
ctx = socket_connect_send(sock, my_address,
server_address, flags, resolve_ctx, ev);
return socket_connect_recv(ctx);
}
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