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/*
Unix SMB/CIFS implementation.
process model: standard (1 process per client connection)
Copyright (C) Andrew Tridgell 1992-2005
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 "lib/events/events.h"
#include "lib/tdb/include/tdb.h"
#include "dlinklist.h"
#include "smb_server/smb_server.h"
#include "system/filesys.h"
/*
called when the process model is selected
*/
static void standard_model_init(struct event_context *ev)
{
signal(SIGCHLD, SIG_IGN);
}
/*
called when a listening socket becomes readable.
*/
static void standard_accept_connection(struct event_context *ev,
struct socket_context *sock,
void (*new_conn)(struct event_context *, struct socket_context *,
uint32_t , void *),
void *private)
{
NTSTATUS status;
struct socket_context *sock2;
pid_t pid;
struct event_context *ev2;
/* accept an incoming connection. */
status = socket_accept(sock, &sock2);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("standard_accept_connection: accept: %s\n",
nt_errstr(status)));
/* this looks strange, but is correct. We need to throttle things until
the system clears enough resources to handle this new socket */
sleep(1);
return;
}
pid = fork();
if (pid != 0) {
/* parent or error code ... */
talloc_free(sock2);
/* go back to the event loop */
return;
}
/* This is now the child code. We need a completely new event_context to work with */
ev2 = event_context_init(NULL);
/* the service has given us a private pointer that
encapsulates the context it needs for this new connection -
everything else will be freed */
talloc_steal(ev2, private);
talloc_steal(private, sock2);
/* this will free all the listening sockets and all state that
is not associated with this new connection */
talloc_free(sock);
talloc_free(ev);
/* we don't care if the dup fails, as its only a select()
speed optimisation */
socket_dup(sock2);
/* 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();
/* setup this new connection */
new_conn(ev2, sock2, getpid(), private);
/* we can't return to the top level here, as that event context is gone,
so we now process events in the new event context until there are no
more to process */
event_loop_wait(ev2);
talloc_free(ev2);
exit(0);
}
/*
called to create a new server task
*/
static void standard_new_task(struct event_context *ev,
void (*new_task)(struct event_context *, uint32_t , void *),
void *private)
{
pid_t pid;
struct event_context *ev2;
pid = fork();
if (pid != 0) {
/* parent or error code ... go back to the event loop */
return;
}
/* This is now the child code. We need a completely new event_context to work with */
ev2 = event_context_init(NULL);
/* the service has given us a private pointer that
encapsulates the context it needs for this new connection -
everything else will be freed */
talloc_steal(ev2, private);
/* this will free all the listening sockets and all state that
is not associated with this new connection */
talloc_free(ev);
/* 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();
/* setup this new connection */
new_task(ev2, getpid(), private);
/* we can't return to the top level here, as that event context is gone,
so we now process events in the new event context until there are no
more to process */
event_loop_wait(ev2);
talloc_free(ev2);
exit(0);
}
/* called when a task goes down */
static void standard_terminate(struct event_context *ev, const char *reason)
{
DEBUG(2,("standard_terminate: reason[%s]\n",reason));
/* 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();
talloc_free(ev);
/* terminate this process */
exit(0);
}
static const struct model_ops standard_ops = {
.name = "standard",
.model_init = standard_model_init,
.accept_connection = standard_accept_connection,
.new_task = standard_new_task,
.terminate = standard_terminate,
};
/*
initialise the standard process model, registering ourselves with the process model subsystem
*/
NTSTATUS process_model_standard_init(void)
{
return register_process_model(&standard_ops);
}
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