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/*
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>
Copyright (C) Stefan (metze) Metzmacher 2004
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"
#include "events.h"
#include "dlinklist.h"
#include "smb_server/smb_server.h"
#include "process_model.h"
/*
called when the process model is selected
*/
static void standard_model_init(struct server_context *server)
{
signal(SIGCHLD, SIG_IGN);
}
static void standard_model_exit(struct server_context *server, const char *reason)
{
DEBUG(1,("standard_model_exit: reason[%s]\n",reason));
talloc_free(server);
exit(0);
}
/*
called when a listening socket becomes readable
*/
static void standard_accept_connection(struct event_context *ev, struct fd_event *srv_fde,
struct timeval t, uint16_t flags)
{
NTSTATUS status;
struct socket_context *sock;
struct server_stream_socket *stream_socket = srv_fde->private;
struct server_connection *conn;
pid_t pid;
/* accept an incoming connection. */
status = socket_accept(stream_socket->socket, &sock);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("standard_accept_connection: accept: %s\n",
nt_errstr(status)));
return;
}
pid = fork();
if (pid != 0) {
/* parent or error code ... */
socket_destroy(sock);
/* go back to the event loop */
return;
}
/* Child code ... */
/* close all the listening sockets */
event_remove_fd_all_handler(ev, server_accept_handler);
/* we don't care if the dup fails, as its only a select()
speed optimisation */
socket_dup(sock);
/* tdb needs special fork handling */
if (tdb_reopen_all() == -1) {
DEBUG(0,("standard_accept_connection: tdb_reopen_all failed.\n"));
}
/* Ensure that the forked children do not expose identical random streams */
set_need_random_reseed();
conn = server_setup_connection(ev, stream_socket, sock, t, getpid());
if (!conn) {
DEBUG(0,("server_setup_connection(ev, server_socket, sock, t) failed\n"));
exit(1);
return;
}
talloc_steal(conn, sock);
/* return to the event loop */
}
/* called when a SMB connection goes down */
static void standard_terminate_connection(struct server_connection *conn, const char *reason)
{
DEBUG(2,("standard_terminate_connection: reason[%s]\n",reason));
if (conn) {
talloc_free(conn->stream_socket->service->server);
}
/* this init_iconv() has the effect of freeing the iconv context memory,
which makes leak checking easier */
init_iconv();
/* the secrets db should really hang off the connection structure */
secrets_shutdown();
/* terminate this process */
exit(0);
}
/*
called to create a new event context for a new task
*/
static void standard_create_task(struct server_task *task)
{
pid_t pid;
pid = fork();
if (pid != 0) {
/* parent or error code ... */
talloc_free(task);
/* go back to the event loop */
return;
}
/* Child code ... */
/* close all the listening sockets */
event_remove_fd_all_handler(task->service->server->event.ctx, server_accept_handler);
/* tdb needs special fork handling */
if (tdb_reopen_all() == -1) {
DEBUG(0,("standard_accept_connection: tdb_reopen_all failed.\n"));
}
/* Ensure that the forked children do not expose identical random streams */
set_need_random_reseed();
task->task.id = (uint32)getpid();
task->event.ctx = task->service->server->event.ctx;
/* setup to receive internal messages on this connection */
task->messaging.ctx = messaging_init(task, task->task.id, task->event.ctx);
if (!task->messaging.ctx) {
server_terminate_task(task, "messaging_init() failed");
return;
}
task->task.ops->task_init(task);
server_terminate_task(task, "exit");
return;
}
/*
called to destroy a new event context for a new task
*/
static void standard_terminate_task(struct server_task *task, const char *reason)
{
DEBUG(2,("standard_terminate_task: reason[%s]\n",reason));
talloc_free(task);
/* this init_iconv() has the effect of freeing the iconv context memory,
which makes leak checking easier */
init_iconv();
/* the secrets db should really hang off the connection structure */
secrets_shutdown();
/* terminate this process */
exit(0);
}
static const struct model_ops standard_ops = {
.name = "standard",
.model_init = standard_model_init,
.model_exit = standard_model_exit,
.accept_connection = standard_accept_connection,
.terminate_connection = standard_terminate_connection,
.create_task = standard_create_task,
.terminate_task = standard_terminate_task
};
/*
initialise the standard process model, registering ourselves with the process model subsystem
*/
NTSTATUS process_model_standard_init(void)
{
NTSTATUS ret;
/* register ourselves with the PROCESS_MODEL subsystem. */
ret = register_process_model(&standard_ops);
if (!NT_STATUS_IS_OK(ret)) {
DEBUG(0,("Failed to register process_model 'standard'!\n"));
return ret;
}
return ret;
}
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