2 Unix SMB/CIFS implementation.
4 helper functions for stream based servers
6 Copyright (C) Andrew Tridgell 2003-2005
7 Copyright (C) Stefan (metze) Metzmacher 2004
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 #include "process_model.h"
26 #include "lib/events/events.h"
27 #include "lib/socket/socket.h"
28 #include "smbd/service_stream.h"
30 /* the range of ports to try for dcerpc over tcp endpoints */
31 #define SERVER_TCP_LOW_PORT 1024
32 #define SERVER_TCP_HIGH_PORT 1300
34 /* size of listen() backlog in smbd */
35 #define SERVER_LISTEN_BACKLOG 10
39 private structure for a single listening stream socket
41 struct stream_socket {
42 const struct stream_server_ops *ops;
43 struct event_context *event_ctx;
44 const struct model_ops *model_ops;
45 struct socket_context *sock;
51 close the socket and shutdown a stream_connection
53 void stream_terminate_connection(struct stream_connection *srv_conn, const char *reason)
55 struct event_context *event_ctx = srv_conn->event.ctx;
56 const struct model_ops *model_ops = srv_conn->model_ops;
57 talloc_free(srv_conn);
58 model_ops->terminate(event_ctx, reason);
62 the select loop has indicated that a stream is ready for IO
64 static void stream_io_handler(struct event_context *ev, struct fd_event *fde,
65 uint16_t flags, void *private)
67 struct stream_connection *conn = talloc_get_type(private,
68 struct stream_connection);
69 if (flags & EVENT_FD_WRITE) {
70 conn->ops->send_handler(conn, flags);
74 if (flags & EVENT_FD_READ) {
75 conn->ops->recv_handler(conn, flags);
81 called when a new socket connection has been established. This is called in the process
82 context of the new process (if appropriate)
84 static void stream_new_connection(struct event_context *ev,
85 struct socket_context *sock,
86 uint32_t server_id, void *private)
88 struct stream_socket *stream_socket = talloc_get_type(private, struct stream_socket);
89 struct stream_connection *srv_conn;
91 srv_conn = talloc_zero(ev, struct stream_connection);
93 DEBUG(0,("talloc(mem_ctx, struct stream_connection) failed\n"));
97 talloc_steal(srv_conn, sock);
99 srv_conn->private = stream_socket->private;
100 srv_conn->model_ops = stream_socket->model_ops;
101 srv_conn->socket = sock;
102 srv_conn->server_id = server_id;
103 srv_conn->ops = stream_socket->ops;
104 srv_conn->event.ctx = ev;
105 srv_conn->event.fde = event_add_fd(ev, srv_conn, socket_get_fd(sock),
107 stream_io_handler, srv_conn);
109 if (!socket_check_access(sock, "smbd", lp_hostsallow(-1), lp_hostsdeny(-1))) {
110 stream_terminate_connection(srv_conn, "denied by access rules");
114 /* setup to receive internal messages on this connection */
115 srv_conn->msg_ctx = messaging_init(srv_conn, srv_conn->server_id, ev);
116 if (!srv_conn->msg_ctx) {
117 stream_terminate_connection(srv_conn, "messaging_init() failed");
121 /* call the server specific accept code */
122 stream_socket->ops->accept_connection(srv_conn);
127 called when someone opens a connection to one of our listening ports
129 static void stream_accept_handler(struct event_context *ev, struct fd_event *fde,
130 uint16_t flags, void *private)
132 struct stream_socket *stream_socket = talloc_get_type(private, struct stream_socket);
134 /* ask the process model to create us a process for this new
135 connection. When done, it calls stream_new_connection()
136 with the newly created socket */
137 stream_socket->model_ops->accept_connection(ev, stream_socket->sock,
138 stream_new_connection, stream_socket);
144 setup a listen stream socket
145 if you pass *port == 0, then a port > 1024 is used
147 NTSTATUS stream_setup_socket(struct event_context *event_context,
148 const struct model_ops *model_ops,
149 const struct stream_server_ops *stream_ops,
151 const char *sock_addr,
156 struct stream_socket *stream_socket;
159 stream_socket = talloc_zero(event_context, struct stream_socket);
160 NT_STATUS_HAVE_NO_MEMORY(stream_socket);
162 status = socket_create(family, SOCKET_TYPE_STREAM, &stream_socket->sock, 0);
163 NT_STATUS_NOT_OK_RETURN(status);
165 talloc_steal(stream_socket, stream_socket->sock);
167 /* ready to listen */
168 status = socket_set_option(stream_socket->sock, "SO_KEEPALIVE", NULL);
169 NT_STATUS_NOT_OK_RETURN(status);
171 status = socket_set_option(stream_socket->sock, lp_socket_options(), NULL);
172 NT_STATUS_NOT_OK_RETURN(status);
174 /* TODO: set socket ACL's here when they're implemented */
177 for (i=SERVER_TCP_LOW_PORT;i<= SERVER_TCP_HIGH_PORT;i++) {
178 status = socket_listen(stream_socket->sock, sock_addr, i,
179 SERVER_LISTEN_BACKLOG, 0);
180 if (NT_STATUS_IS_OK(status)) {
186 status = socket_listen(stream_socket->sock, sock_addr, *port, SERVER_LISTEN_BACKLOG, 0);
189 if (!NT_STATUS_IS_OK(status)) {
190 DEBUG(0,("Failed to listen on %s:%u - %s\n",
191 sock_addr, *port, nt_errstr(status)));
192 talloc_free(stream_socket);
196 event_add_fd(event_context, stream_socket->sock,
197 socket_get_fd(stream_socket->sock),
198 EVENT_FD_READ, stream_accept_handler, stream_socket);
200 stream_socket->private = talloc_reference(stream_socket, private);
201 stream_socket->ops = stream_ops;
202 stream_socket->event_ctx = event_context;
203 stream_socket->model_ops = model_ops;