| 1 | /*
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| 2 | Unix SMB/CIFS implementation.
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| 3 |
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| 4 | process model: process (1 process handles all client connections)
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| 5 |
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| 6 | Copyright (C) Andrew Tridgell 2003
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| 7 | Copyright (C) James J Myers 2003 <myersjj@samba.org>
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| 8 | Copyright (C) Stefan (metze) Metzmacher 2004
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| 9 |
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| 10 | This program is free software; you can redistribute it and/or modify
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| 11 | it under the terms of the GNU General Public License as published by
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| 12 | the Free Software Foundation; either version 3 of the License, or
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| 13 | (at your option) any later version.
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| 14 |
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| 15 | This program is distributed in the hope that it will be useful,
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| 16 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 18 | GNU General Public License for more details.
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| 19 |
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| 20 | You should have received a copy of the GNU General Public License
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| 21 | along with this program. If not, see <http://www.gnu.org/licenses/>.
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| 22 | */
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| 23 |
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| 24 | #include "includes.h"
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| 25 | #include "smbd/process_model.h"
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| 26 | #include "system/filesys.h"
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| 27 | #include "cluster/cluster.h"
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| 28 |
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| 29 | /*
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| 30 | called when the process model is selected
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| 31 | */
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| 32 | static void single_model_init(void)
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| 33 | {
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| 34 | }
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| 35 |
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| 36 | /*
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| 37 | called when a listening socket becomes readable.
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| 38 | */
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| 39 | static void single_accept_connection(struct tevent_context *ev,
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| 40 | struct loadparm_context *lp_ctx,
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| 41 | struct socket_context *listen_socket,
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| 42 | void (*new_conn)(struct tevent_context *,
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| 43 | struct loadparm_context *,
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| 44 | struct socket_context *,
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| 45 | struct server_id , void *),
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| 46 | void *private_data)
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| 47 | {
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| 48 | NTSTATUS status;
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| 49 | struct socket_context *connected_socket;
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| 50 |
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| 51 | /* accept an incoming connection. */
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| 52 | status = socket_accept(listen_socket, &connected_socket);
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| 53 | if (!NT_STATUS_IS_OK(status)) {
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| 54 | DEBUG(0,("single_accept_connection: accept: %s\n", nt_errstr(status)));
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| 55 | /* this looks strange, but is correct.
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| 56 |
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| 57 | We can only be here if woken up from select, due to
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| 58 | an incoming connection.
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| 59 |
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| 60 | We need to throttle things until the system clears
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| 61 | enough resources to handle this new socket.
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| 62 |
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| 63 | If we don't then we will spin filling the log and
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| 64 | causing more problems. We don't panic as this is
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| 65 | probably a temporary resource constraint */
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| 66 | sleep(1);
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| 67 | return;
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| 68 | }
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| 69 |
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| 70 | talloc_steal(private_data, connected_socket);
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| 71 |
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| 72 | /* The cluster_id(0, fd) cannot collide with the incrementing
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| 73 | * task below, as the first component is 0, not 1 */
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| 74 | new_conn(ev, lp_ctx, connected_socket,
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| 75 | cluster_id(0, socket_get_fd(connected_socket)), private_data);
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| 76 | }
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| 77 |
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| 78 | /*
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| 79 | called to startup a new task
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| 80 | */
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| 81 | static void single_new_task(struct tevent_context *ev,
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| 82 | struct loadparm_context *lp_ctx,
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| 83 | const char *service_name,
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| 84 | void (*new_task)(struct tevent_context *, struct loadparm_context *, struct server_id, void *),
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| 85 | void *private_data)
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| 86 | {
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| 87 | /* start our taskids at 1, zero is reserved for the top
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| 88 | level samba task */
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| 89 | static uint32_t taskid = 1;
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| 90 |
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| 91 | /* We use 1 so we cannot collide in with cluster ids generated
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| 92 | * in the accept connection above, and unlikly to collide with
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| 93 | * PIDs from process modal standard (don't run samba as
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| 94 | * init) */
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| 95 | new_task(ev, lp_ctx, cluster_id(1, taskid++), private_data);
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| 96 | }
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| 97 |
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| 98 |
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| 99 | /* called when a task goes down */
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| 100 | static void single_terminate(struct tevent_context *ev, struct loadparm_context *lp_ctx, const char *reason)
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| 101 | {
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| 102 | DEBUG(3,("single_terminate: reason[%s]\n",reason));
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| 103 | }
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| 104 |
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| 105 | /* called to set a title of a task or connection */
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| 106 | static void single_set_title(struct tevent_context *ev, const char *title)
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| 107 | {
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| 108 | }
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| 109 |
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| 110 | const struct model_ops single_ops = {
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| 111 | .name = "single",
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| 112 | .model_init = single_model_init,
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| 113 | .new_task = single_new_task,
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| 114 | .accept_connection = single_accept_connection,
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| 115 | .terminate = single_terminate,
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| 116 | .set_title = single_set_title,
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| 117 | };
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| 118 |
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| 119 | /*
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| 120 | initialise the single process model, registering ourselves with the
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| 121 | process model subsystem
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| 122 | */
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| 123 | NTSTATUS process_model_single_init(void)
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| 124 | {
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| 125 | return register_process_model(&single_ops);
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| 126 | }
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