wrepl_out_helpers.c

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/* 
   Unix SMB/CIFS implementation.
   
   WINS Replication server
   
   Copyright (C) Stefan Metzmacher	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 "lib/socket/socket.h"
#include "smbd/service_task.h"
#include "smbd/service_stream.h"
#include "librpc/gen_ndr/winsrepl.h"
#include "wrepl_server/wrepl_server.h"
#include "nbt_server/wins/winsdb.h"
#include "libcli/composite/composite.h"
#include "libcli/wrepl/winsrepl.h"
#include "libcli/resolve/resolve.h"
#include "param/param.h"

enum wreplsrv_out_connect_stage {
	WREPLSRV_OUT_CONNECT_STAGE_WAIT_SOCKET,
	WREPLSRV_OUT_CONNECT_STAGE_WAIT_ASSOC_CTX,
	WREPLSRV_OUT_CONNECT_STAGE_DONE
};

struct wreplsrv_out_connect_state {
	enum wreplsrv_out_connect_stage stage;
	struct composite_context *c;
	struct wrepl_request *req;
	struct composite_context *c_req;
	struct wrepl_associate assoc_io;
	enum winsrepl_partner_type type;
	struct wreplsrv_out_connection *wreplconn;
};

static void wreplsrv_out_connect_handler_creq(struct composite_context *c_req);
static void wreplsrv_out_connect_handler_req(struct wrepl_request *req);

static NTSTATUS wreplsrv_out_connect_wait_socket(struct wreplsrv_out_connect_state *state)
{
	NTSTATUS status;

	status = wrepl_connect_recv(state->c_req);
	NT_STATUS_NOT_OK_RETURN(status);

	state->req = wrepl_associate_send(state->wreplconn->sock, &state->assoc_io);
	NT_STATUS_HAVE_NO_MEMORY(state->req);

	state->req->async.fn		= wreplsrv_out_connect_handler_req;
	state->req->async.private	= state;

	state->stage = WREPLSRV_OUT_CONNECT_STAGE_WAIT_ASSOC_CTX;

	return NT_STATUS_OK;
}

static NTSTATUS wreplsrv_out_connect_wait_assoc_ctx(struct wreplsrv_out_connect_state *state)
{
	NTSTATUS status;

	status = wrepl_associate_recv(state->req, &state->assoc_io);
	NT_STATUS_NOT_OK_RETURN(status);

	state->wreplconn->assoc_ctx.peer_ctx = state->assoc_io.out.assoc_ctx;

	if (state->type == WINSREPL_PARTNER_PUSH) {
		state->wreplconn->partner->push.wreplconn = state->wreplconn;
		talloc_steal(state->wreplconn->partner, state->wreplconn);
	} else if (state->type == WINSREPL_PARTNER_PULL) {
		state->wreplconn->partner->pull.wreplconn = state->wreplconn;
		talloc_steal(state->wreplconn->partner, state->wreplconn);
	}

	state->stage = WREPLSRV_OUT_CONNECT_STAGE_DONE;

	return NT_STATUS_OK;
}

static void wreplsrv_out_connect_handler(struct wreplsrv_out_connect_state *state)
{
	struct composite_context *c = state->c;

	switch (state->stage) {
	case WREPLSRV_OUT_CONNECT_STAGE_WAIT_SOCKET:
		c->status = wreplsrv_out_connect_wait_socket(state);
		break;
	case WREPLSRV_OUT_CONNECT_STAGE_WAIT_ASSOC_CTX:
		c->status = wreplsrv_out_connect_wait_assoc_ctx(state);
		c->state  = COMPOSITE_STATE_DONE;
		break;
	case WREPLSRV_OUT_CONNECT_STAGE_DONE:
		c->status = NT_STATUS_INTERNAL_ERROR;
	}

	if (!NT_STATUS_IS_OK(c->status)) {
		c->state = COMPOSITE_STATE_ERROR;
	}

	if (c->state >= COMPOSITE_STATE_DONE && c->async.fn) {
		c->async.fn(c);
	}
}

static void wreplsrv_out_connect_handler_creq(struct composite_context *creq)
{
	struct wreplsrv_out_connect_state *state = talloc_get_type(creq->async.private_data,
						   struct wreplsrv_out_connect_state);
	wreplsrv_out_connect_handler(state);
	return;
}

static void wreplsrv_out_connect_handler_req(struct wrepl_request *req)
{
	struct wreplsrv_out_connect_state *state = talloc_get_type(req->async.private,
						   struct wreplsrv_out_connect_state);
	wreplsrv_out_connect_handler(state);
	return;
}

static struct composite_context *wreplsrv_out_connect_send(struct wreplsrv_partner *partner,
							   enum winsrepl_partner_type type,
							   struct wreplsrv_out_connection *wreplconn)
{
	struct composite_context *c = NULL;
	struct wreplsrv_service *service = partner->service;
	struct wreplsrv_out_connect_state *state = NULL;
	struct wreplsrv_out_connection **wreplconnp = &wreplconn;
	bool cached_connection = false;

	c = talloc_zero(partner, struct composite_context);
	if (!c) goto failed;

	state = talloc_zero(c, struct wreplsrv_out_connect_state);
	if (!state) goto failed;
	state->c	= c;
	state->type	= type;

	c->state	= COMPOSITE_STATE_IN_PROGRESS;
	c->event_ctx	= service->task->event_ctx;
	c->private_data	= state;

	if (type == WINSREPL_PARTNER_PUSH) {
		cached_connection	= true;
		wreplconn		= partner->push.wreplconn;
		wreplconnp		= &partner->push.wreplconn;
	} else if (type == WINSREPL_PARTNER_PULL) {
		cached_connection	= true;
		wreplconn		= partner->pull.wreplconn;
		wreplconnp		= &partner->pull.wreplconn;
	}

	/* we have a connection already, so use it */
	if (wreplconn) {
		if (!wreplconn->sock->dead) {
			state->stage	= WREPLSRV_OUT_CONNECT_STAGE_DONE;
			state->wreplconn= wreplconn;
			composite_done(c);
			return c;
		} else if (!cached_connection) {
			state->stage	= WREPLSRV_OUT_CONNECT_STAGE_DONE;
			state->wreplconn= NULL;
			composite_done(c);
			return c;
		} else {
			talloc_free(wreplconn);
			*wreplconnp = NULL;
		}
	}

	wreplconn = talloc_zero(state, struct wreplsrv_out_connection);
	if (!wreplconn) goto failed;

	wreplconn->service	= service;
	wreplconn->partner	= partner;
	wreplconn->sock		= wrepl_socket_init(wreplconn, service->task->event_ctx, lp_iconv_convenience(service->task->lp_ctx));
	if (!wreplconn->sock) goto failed;

	state->stage	= WREPLSRV_OUT_CONNECT_STAGE_WAIT_SOCKET;
	state->wreplconn= wreplconn;
	state->c_req	= wrepl_connect_send(wreplconn->sock,
					     lp_resolve_context(service->task->lp_ctx),
					     partner->our_address?partner->our_address:wrepl_best_ip(service->task->lp_ctx, partner->address),
					     partner->address);
	if (!state->c_req) goto failed;

	state->c_req->async.fn			= wreplsrv_out_connect_handler_creq;
	state->c_req->async.private_data	= state;

	return c;
failed:
	talloc_free(c);
	return NULL;
}

static NTSTATUS wreplsrv_out_connect_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
					  struct wreplsrv_out_connection **wreplconn)
{
	NTSTATUS status;

	status = composite_wait(c);

	if (NT_STATUS_IS_OK(status)) {
		struct wreplsrv_out_connect_state *state = talloc_get_type(c->private_data,
							   struct wreplsrv_out_connect_state);
		if (state->wreplconn) {
			*wreplconn = talloc_reference(mem_ctx, state->wreplconn);
			if (!*wreplconn) status = NT_STATUS_NO_MEMORY;
		} else {
			status = NT_STATUS_INVALID_CONNECTION;
		}
	}

	talloc_free(c);
	return status;
	
}

struct wreplsrv_pull_table_io {
	struct {
		struct wreplsrv_partner *partner;
		uint32_t num_owners;
		struct wrepl_wins_owner *owners;
	} in;
	struct {
		uint32_t num_owners;
		struct wrepl_wins_owner *owners;
	} out;
};

enum wreplsrv_pull_table_stage {
	WREPLSRV_PULL_TABLE_STAGE_WAIT_CONNECTION,
	WREPLSRV_PULL_TABLE_STAGE_WAIT_TABLE_REPLY,
	WREPLSRV_PULL_TABLE_STAGE_DONE
};

struct wreplsrv_pull_table_state {
	enum wreplsrv_pull_table_stage stage;
	struct composite_context *c;
	struct wrepl_request *req;
	struct wrepl_pull_table table_io;
	struct wreplsrv_pull_table_io *io;
	struct composite_context *creq;
	struct wreplsrv_out_connection *wreplconn;
};

static void wreplsrv_pull_table_handler_req(struct wrepl_request *req);

static NTSTATUS wreplsrv_pull_table_wait_connection(struct wreplsrv_pull_table_state *state)
{
	NTSTATUS status;

	status = wreplsrv_out_connect_recv(state->creq, state, &state->wreplconn);
	NT_STATUS_NOT_OK_RETURN(status);

	state->table_io.in.assoc_ctx = state->wreplconn->assoc_ctx.peer_ctx;
	state->req = wrepl_pull_table_send(state->wreplconn->sock, &state->table_io);
	NT_STATUS_HAVE_NO_MEMORY(state->req);

	state->req->async.fn		= wreplsrv_pull_table_handler_req;
	state->req->async.private	= state;

	state->stage = WREPLSRV_PULL_TABLE_STAGE_WAIT_TABLE_REPLY;

	return NT_STATUS_OK;
}

static NTSTATUS wreplsrv_pull_table_wait_table_reply(struct wreplsrv_pull_table_state *state)
{
	NTSTATUS status;

	status = wrepl_pull_table_recv(state->req, state, &state->table_io);
	NT_STATUS_NOT_OK_RETURN(status);

	state->stage = WREPLSRV_PULL_TABLE_STAGE_DONE;

	return NT_STATUS_OK;
}

static void wreplsrv_pull_table_handler(struct wreplsrv_pull_table_state *state)
{
	struct composite_context *c = state->c;

	switch (state->stage) {
	case WREPLSRV_PULL_TABLE_STAGE_WAIT_CONNECTION:
		c->status = wreplsrv_pull_table_wait_connection(state);
		break;
	case WREPLSRV_PULL_TABLE_STAGE_WAIT_TABLE_REPLY:
		c->status = wreplsrv_pull_table_wait_table_reply(state);
		c->state  = COMPOSITE_STATE_DONE;
		break;
	case WREPLSRV_PULL_TABLE_STAGE_DONE:
		c->status = NT_STATUS_INTERNAL_ERROR;
	}

	if (!NT_STATUS_IS_OK(c->status)) {
		c->state = COMPOSITE_STATE_ERROR;
	}

	if (c->state >= COMPOSITE_STATE_DONE && c->async.fn) {
		c->async.fn(c);
	}
}

static void wreplsrv_pull_table_handler_creq(struct composite_context *creq)
{
	struct wreplsrv_pull_table_state *state = talloc_get_type(creq->async.private_data,
						  struct wreplsrv_pull_table_state);
	wreplsrv_pull_table_handler(state);
	return;
}

static void wreplsrv_pull_table_handler_req(struct wrepl_request *req)
{
	struct wreplsrv_pull_table_state *state = talloc_get_type(req->async.private,
						  struct wreplsrv_pull_table_state);
	wreplsrv_pull_table_handler(state);
	return;
}

static struct composite_context *wreplsrv_pull_table_send(TALLOC_CTX *mem_ctx, struct wreplsrv_pull_table_io *io)
{
	struct composite_context *c = NULL;
	struct wreplsrv_service *service = io->in.partner->service;
	struct wreplsrv_pull_table_state *state = NULL;

	c = talloc_zero(mem_ctx, struct composite_context);
	if (!c) goto failed;

	state = talloc_zero(c, struct wreplsrv_pull_table_state);
	if (!state) goto failed;
	state->c	= c;
	state->io	= io;

	c->state	= COMPOSITE_STATE_IN_PROGRESS;
	c->event_ctx	= service->task->event_ctx;
	c->private_data	= state;

	if (io->in.num_owners) {
		state->table_io.out.num_partners	= io->in.num_owners;
		state->table_io.out.partners		= io->in.owners;
		state->stage				= WREPLSRV_PULL_TABLE_STAGE_DONE;
		composite_done(c);
		return c;
	}

	state->stage    = WREPLSRV_PULL_TABLE_STAGE_WAIT_CONNECTION;
	state->creq	= wreplsrv_out_connect_send(io->in.partner, WINSREPL_PARTNER_PULL, NULL);
	if (!state->creq) goto failed;

	state->creq->async.fn		= wreplsrv_pull_table_handler_creq;
	state->creq->async.private_data	= state;

	return c;