/* 
   Unix SMB/CIFS implementation.
   process model: standard (1 process per client connection)
   Copyright (C) Andrew Tridgell 1992-2003
   Copyright (C) James J Myers 2003 <myersjj@samba.org>
   
   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.
*/

#include "includes.h"

/*
  called when the process model is selected
*/
static void model_startup(void)
{
	signal(SIGCHLD, SIG_IGN);
}

/*
  called when a listening socket becomes readable
*/
static void accept_connection(struct event_context *ev, struct fd_event *fde, time_t t, uint16_t flags)
{
	int accepted_fd;
	struct sockaddr addr;
	socklen_t in_addrlen = sizeof(addr);
	pid_t pid;
	struct model_ops *model_ops = fde->private;

	accepted_fd = accept(fde->fd,&addr,&in_addrlen);
	if (accepted_fd == -1) {
		DEBUG(0,("accept_connection_standard: accept: %s\n",
			 strerror(errno)));
		return;
	}

	pid = fork();

	if (pid != 0) {
		/* parent or error code ... */

		close(accepted_fd);
		/* go back to the event loop */
		return;
	}

	/* Child code ... */

	/* close all the listening sockets */
	event_remove_fd_all_handler(ev, model_ops->accept_connection);
	event_remove_fd_all_handler(ev, model_ops->accept_rpc_connection);
			
	/* tdb needs special fork handling */
	if (tdb_reopen_all() == -1) {
		DEBUG(0,("accept_connection_standard: tdb_reopen_all failed.\n"));
	}

	/* Load DSO's */
	init_modules();
		
	/* initialize new process */
	smbd_process_init();
		
	init_smbsession(ev, model_ops, accepted_fd, smbd_read_handler);

	/* return to the event loop */
}

/*
  called when a rpc listening socket becomes readable
*/
static void accept_rpc_connection(struct event_context *ev, struct fd_event *fde, time_t t, uint16_t flags)
{
	int accepted_fd;
	struct sockaddr addr;
	socklen_t in_addrlen = sizeof(addr);
	pid_t pid;

	accepted_fd = accept(fde->fd,&addr,&in_addrlen);
	if (accepted_fd == -1) {
		DEBUG(0,("accept_connection_standard: accept: %s\n",
			 strerror(errno)));
		return;
	}

	pid = fork();

	if (pid != 0) {
		/* parent or error code ... */
		close(accepted_fd);
		/* go back to the event loop */
		return;
	}

	/* Child code ... */

	/* close all the listening sockets */
	event_remove_fd_all_handler(ev, accept_connection);
	event_remove_fd_all_handler(ev, accept_rpc_connection);
			
	init_rpc_session(ev, fde->private, accepted_fd); 
}

/* called when a SMB connection goes down */
static void terminate_connection(struct smbsrv_context *server, const char *reason) 
{
	server_terminate(server);
	/* terminate this process */
	exit(0);
}

/* called when a rpc connection goes down */
static void terminate_rpc_connection(void *r, const char *reason) 
{
	rpc_server_terminate(r);
	/* terminate this process */
	exit(0);
}

static int get_id(struct request_context *req)
{
	return (int)req->smb_ctx->pid;
}

static void standard_exit_server(struct smbsrv_context *smb, const char *reason)
{
	DEBUG(1,("standard_exit_server: reason[%s]\n",reason));
}

/*
  initialise the standard process model, registering ourselves with the process model subsystem
 */
NTSTATUS process_model_standard_init(void)
{
	NTSTATUS ret;
	struct model_ops ops;

	ZERO_STRUCT(ops);

	/* fill in our name */
	ops.name = "standard";

	/* fill in all the operations */
	ops.model_startup = model_startup;
	ops.accept_connection = accept_connection;
	ops.accept_rpc_connection = accept_rpc_connection;
	ops.terminate_connection = terminate_connection;
	ops.terminate_rpc_connection = terminate_rpc_connection;
	ops.exit_server = standard_exit_server;
	ops.get_id = get_id;

	/* register ourselves with the PROCESS_MODEL subsystem. */
	ret = register_backend("process_model", &ops);
	if (!NT_STATUS_IS_OK(ret)) {
		DEBUG(0,("Failed to register process_model 'standard'!\n"));
		return ret;
	}

	return ret;
}