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Diffstat (limited to 'source4/smbd/process_onefork.c')
| -rw-r--r-- | source4/smbd/process_onefork.c | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/source4/smbd/process_onefork.c b/source4/smbd/process_onefork.c new file mode 100644 index 0000000000..45e461327c --- /dev/null +++ b/source4/smbd/process_onefork.c @@ -0,0 +1,175 @@ +/* + Unix SMB/CIFS implementation. + + process model: onefork (1 child process) + + Copyright (C) Andrew Tridgell 1992-2005 + Copyright (C) James J Myers 2003 <myersjj@samba.org> + Copyright (C) Stefan (metze) Metzmacher 2004 + Copyright (C) Andrew Bartlett 2008 <abartlet@samba.org> + Copyright (C) David Disseldorp 2008 <ddiss@sgi.com> + + 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/process_model.h" +#include "param/secrets.h" +#include "system/filesys.h" +#include "cluster/cluster.h" +#include "param/param.h" +#include "lib/ldb_wrap.h" + +#ifdef HAVE_SETPROCTITLE +#ifdef HAVE_SETPROCTITLE_H +#include <setproctitle.h> +#endif +#else +#define setproctitle none_setproctitle +static int none_setproctitle(const char *fmt, ...) PRINTF_ATTRIBUTE(1, 2); +static int none_setproctitle(const char *fmt, ...) +{ + return 0; +} +#endif + +/* + called when the process model is selected +*/ +static void onefork_model_init(struct tevent_context *ev) +{ + signal(SIGCHLD, SIG_IGN); +} + +static void onefork_reload_after_fork(void) +{ + ldb_wrap_fork_hook(); + + /* Ensure that the forked children do not expose identical random streams */ + set_need_random_reseed(); +} + +/* + called when a listening socket becomes readable. +*/ +static void onefork_accept_connection(struct tevent_context *ev, + struct loadparm_context *lp_ctx, + struct socket_context *listen_socket, + void (*new_conn)(struct tevent_context *, + struct loadparm_context *, struct socket_context *, + struct server_id , void *), + void *private_data) +{ + NTSTATUS status; + struct socket_context *connected_socket; + pid_t pid = getpid(); + + /* accept an incoming connection. */ + status = socket_accept(listen_socket, &connected_socket); + if (!NT_STATUS_IS_OK(status)) { + return; + } + + talloc_steal(private_data, connected_socket); + + new_conn(ev, lp_ctx, connected_socket, cluster_id(pid, socket_get_fd(connected_socket)), private_data); +} + +/* + called to create a new server task +*/ +static void onefork_new_task(struct tevent_context *ev, + struct loadparm_context *lp_ctx, + const char *service_name, + void (*new_task_fn)(struct tevent_context *, struct loadparm_context *lp_ctx, struct server_id , void *), + void *private_data) +{ + pid_t pid; + int i, num_children; + + struct tevent_context *ev2, *ev_parent; + + pid = fork(); + + if (pid != 0) { + /* parent or error code ... go back to the event loop */ + return; + } + + pid = getpid(); + + /* This is now the child code. We need a completely new event_context to work with */ + ev2 = s4_event_context_init(NULL); + + /* setup this as the default context */ + s4_event_context_set_default(ev2); + + /* 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_data); + + /* this will free all the listening sockets and all state that + is not associated with this new connection */ + talloc_free(ev); + + setproctitle("task %s server_id[%d]", service_name, pid); + + onefork_reload_after_fork(); + + /* setup this new connection: process will bind to it's sockets etc */ + new_task_fn(ev2, lp_ctx, cluster_id(pid, 0), private_data); + + event_loop_wait(ev2); + + talloc_free(ev2); + exit(0); + +} + + +/* called when a task goes down */ +static void onefork_terminate(struct tevent_context *ev, struct loadparm_context *lp_ctx, const char *reason) +{ + DEBUG(2,("onefork_terminate: reason[%s]\n",reason)); +} + +/* called to set a title of a task or connection */ +static void onefork_set_title(struct tevent_context *ev, const char *title) +{ + if (title) { + setproctitle("%s", title); + } else { + setproctitle(NULL); + } +} + +static const struct model_ops onefork_ops = { + .name = "onefork", + .model_init = onefork_model_init, + .accept_connection = onefork_accept_connection, + .new_task = onefork_new_task, + .terminate = onefork_terminate, + .set_title = onefork_set_title, +}; + +/* + initialise the onefork process model, registering ourselves with the process model subsystem + */ +NTSTATUS process_model_onefork_init(void) +{ + return register_process_model(&onefork_ops); +} |