2 Unix SMB/CIFS implementation.
4 process model: standard (1 process per client connection)
6 Copyright (C) Andrew Tridgell 1992-2005
7 Copyright (C) James J Myers 2003 <myersjj@samba.org>
8 Copyright (C) Stefan (metze) Metzmacher 2004
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>.
25 #include "lib/events/events.h"
26 #include "smbd/process_model.h"
27 #include "system/filesys.h"
28 #include "cluster/cluster.h"
29 #include "param/param.h"
30 #include "lib/ldb_wrap.h"
32 #ifdef HAVE_SETPROCTITLE
33 #ifdef HAVE_SETPROCTITLE_H
34 #include <setproctitle.h>
37 #define setproctitle none_setproctitle
38 static int none_setproctitle(const char *fmt, ...) PRINTF_ATTRIBUTE(1, 2);
39 static int none_setproctitle(const char *fmt, ...)
45 /* we hold a pipe open in the parent, and the any child
46 processes wait for EOF on that pipe. This ensures that
47 children die when the parent dies */
48 static int child_pipe[2];
51 called when the process model is selected
53 static void standard_model_init(struct tevent_context *ev)
56 signal(SIGCHLD, SIG_IGN);
60 handle EOF on the child pipe
62 static void standard_pipe_handler(struct tevent_context *event_ctx, struct tevent_fd *fde,
63 uint16_t flags, void *private_data)
65 DEBUG(10,("Child %d exiting\n", (int)getpid()));
70 called when a listening socket becomes readable.
72 static void standard_accept_connection(struct tevent_context *ev,
73 struct loadparm_context *lp_ctx,
74 struct socket_context *sock,
75 void (*new_conn)(struct tevent_context *,
76 struct loadparm_context *, struct socket_context *,
77 struct server_id , void *),
81 struct socket_context *sock2;
83 struct tevent_context *ev2;
84 struct socket_address *c, *s;
86 /* accept an incoming connection. */
87 status = socket_accept(sock, &sock2);
88 if (!NT_STATUS_IS_OK(status)) {
89 DEBUG(0,("standard_accept_connection: accept: %s\n",
91 /* this looks strange, but is correct. We need to throttle things until
92 the system clears enough resources to handle this new socket */
100 /* parent or error code ... */
102 /* go back to the event loop */
108 /* This is now the child code. We need a completely new event_context to work with */
109 ev2 = s4_event_context_init(NULL);
111 /* setup this as the default context */
112 s4_event_context_set_default(ev2);
114 /* the service has given us a private pointer that
115 encapsulates the context it needs for this new connection -
116 everything else will be freed */
117 talloc_steal(ev2, private_data);
118 talloc_steal(private_data, sock2);
120 /* this will free all the listening sockets and all state that
121 is not associated with this new connection */
125 /* we don't care if the dup fails, as its only a select()
126 speed optimisation */
129 /* tdb needs special fork handling */
130 ldb_wrap_fork_hook();
132 tevent_add_fd(ev2, ev2, child_pipe[0], TEVENT_FD_READ,
133 standard_pipe_handler, NULL);
134 close(child_pipe[1]);
136 /* Ensure that the forked children do not expose identical random streams */
137 set_need_random_reseed();
139 /* setup the process title */
140 c = socket_get_peer_addr(sock2, ev2);
141 s = socket_get_my_addr(sock2, ev2);
143 setproctitle("conn c[%s:%u] s[%s:%u] server_id[%d]",
144 c->addr, c->port, s->addr, s->port, pid);
149 /* setup this new connection. Cluster ID is PID based for this process modal */
150 new_conn(ev2, lp_ctx, sock2, cluster_id(pid, 0), private_data);
152 /* we can't return to the top level here, as that event context is gone,
153 so we now process events in the new event context until there are no
155 event_loop_wait(ev2);
162 called to create a new server task
164 static void standard_new_task(struct tevent_context *ev,
165 struct loadparm_context *lp_ctx,
166 const char *service_name,
167 void (*new_task)(struct tevent_context *, struct loadparm_context *lp_ctx, struct server_id , void *),
171 struct tevent_context *ev2;
176 /* parent or error code ... go back to the event loop */
182 /* This is now the child code. We need a completely new event_context to work with */
183 ev2 = s4_event_context_init(NULL);
185 /* setup this as the default context */
186 s4_event_context_set_default(ev2);
188 /* the service has given us a private pointer that
189 encapsulates the context it needs for this new connection -
190 everything else will be freed */
191 talloc_steal(ev2, private_data);
193 /* this will free all the listening sockets and all state that
194 is not associated with this new connection */
197 /* ldb/tdb need special fork handling */
198 ldb_wrap_fork_hook();
200 tevent_add_fd(ev2, ev2, child_pipe[0], TEVENT_FD_READ,
201 standard_pipe_handler, NULL);
202 close(child_pipe[1]);
204 /* Ensure that the forked children do not expose identical random streams */
205 set_need_random_reseed();
207 setproctitle("task %s server_id[%d]", service_name, pid);
209 /* setup this new task. Cluster ID is PID based for this process modal */
210 new_task(ev2, lp_ctx, cluster_id(pid, 0), private_data);
212 /* we can't return to the top level here, as that event context is gone,
213 so we now process events in the new event context until there are no
215 event_loop_wait(ev2);
222 /* called when a task goes down */
223 _NORETURN_ static void standard_terminate(struct tevent_context *ev, struct loadparm_context *lp_ctx,
226 DEBUG(2,("standard_terminate: reason[%s]\n",reason));
228 /* this reload_charcnv() has the effect of freeing the iconv context memory,
229 which makes leak checking easier */
230 reload_charcnv(lp_ctx);
234 /* terminate this process */
238 /* called to set a title of a task or connection */
239 static void standard_set_title(struct tevent_context *ev, const char *title)
242 setproctitle("%s", title);
248 static const struct model_ops standard_ops = {
250 .model_init = standard_model_init,
251 .accept_connection = standard_accept_connection,
252 .new_task = standard_new_task,
253 .terminate = standard_terminate,
254 .set_title = standard_set_title,
258 initialise the standard process model, registering ourselves with the process model subsystem
260 NTSTATUS process_model_standard_init(void)
262 return register_process_model(&standard_ops);