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"
29 #include "lib/messaging/irpc.h"
31 /* the range of ports to try for dcerpc over tcp endpoints */
32 #define SERVER_TCP_LOW_PORT 1024
33 #define SERVER_TCP_HIGH_PORT 1300
35 /* size of listen() backlog in smbd */
36 #define SERVER_LISTEN_BACKLOG 10
40 private structure for a single listening stream socket
42 struct stream_socket {
43 const struct stream_server_ops *ops;
44 struct event_context *event_ctx;
45 const struct model_ops *model_ops;
46 struct socket_context *sock;
52 close the socket and shutdown a stream_connection
54 void stream_terminate_connection(struct stream_connection *srv_conn, const char *reason)
56 struct event_context *event_ctx = srv_conn->event.ctx;
57 const struct model_ops *model_ops = srv_conn->model_ops;
59 if (!reason) reason = "unknwon reason";
61 srv_conn->terminate = reason;
63 if (srv_conn->processing) {
65 * if we're currently inside the stream_io_handler(),
66 * deferr the termination to the end of stream_io_hendler()
68 * and we don't want to read or write to the connection...
70 event_set_fd_flags(srv_conn->event.fde, 0);
74 talloc_free(srv_conn->event.fde);
75 srv_conn->event.fde = NULL;
76 talloc_free(srv_conn);
77 model_ops->terminate(event_ctx, reason);
81 the select loop has indicated that a stream is ready for IO
83 static void stream_io_handler(struct event_context *ev, struct fd_event *fde,
84 uint16_t flags, void *private)
86 struct stream_connection *conn = talloc_get_type(private,
87 struct stream_connection);
89 conn->processing = True;
90 if (flags & EVENT_FD_WRITE) {
91 conn->ops->send_handler(conn, flags);
92 } else if (flags & EVENT_FD_READ) {
93 conn->ops->recv_handler(conn, flags);
95 conn->processing = False;
97 if (conn->terminate) {
98 stream_terminate_connection(conn, conn->terminate);
103 this creates a stream_connection from an already existing connection,
104 used for protocols, where a client connection needs to switched into
107 NTSTATUS stream_new_connection_merge(struct event_context *ev,
108 const struct model_ops *model_ops,
109 struct socket_context *sock,
110 const struct stream_server_ops *stream_ops,
111 struct messaging_context *msg_ctx,
113 struct stream_connection **_srv_conn)
115 struct stream_connection *srv_conn;
117 srv_conn = talloc_zero(ev, struct stream_connection);
118 NT_STATUS_HAVE_NO_MEMORY(srv_conn);
120 talloc_steal(srv_conn, sock);
122 srv_conn->private = private_data;
123 srv_conn->model_ops = model_ops;
124 srv_conn->socket = sock;
125 srv_conn->server_id = 0;
126 srv_conn->ops = stream_ops;
127 srv_conn->msg_ctx = msg_ctx;
128 srv_conn->event.ctx = ev;
129 srv_conn->event.fde = event_add_fd(ev, srv_conn, socket_get_fd(sock),
131 stream_io_handler, srv_conn);
132 *_srv_conn = srv_conn;
137 called when a new socket connection has been established. This is called in the process
138 context of the new process (if appropriate)
140 static void stream_new_connection(struct event_context *ev,
141 struct socket_context *sock,
142 uint32_t server_id, void *private)
144 struct stream_socket *stream_socket = talloc_get_type(private, struct stream_socket);
145 struct stream_connection *srv_conn;
147 srv_conn = talloc_zero(ev, struct stream_connection);
149 DEBUG(0,("talloc(mem_ctx, struct stream_connection) failed\n"));
153 talloc_steal(srv_conn, sock);
155 srv_conn->private = stream_socket->private;
156 srv_conn->model_ops = stream_socket->model_ops;
157 srv_conn->socket = sock;
158 srv_conn->server_id = server_id;
159 srv_conn->ops = stream_socket->ops;
160 srv_conn->event.ctx = ev;
161 srv_conn->event.fde = event_add_fd(ev, srv_conn, socket_get_fd(sock),
163 stream_io_handler, srv_conn);
165 if (!socket_check_access(sock, "smbd", lp_hostsallow(-1), lp_hostsdeny(-1))) {
166 stream_terminate_connection(srv_conn, "denied by access rules");
170 /* setup to receive internal messages on this connection */
171 srv_conn->msg_ctx = messaging_init(srv_conn, srv_conn->server_id, ev);
172 if (!srv_conn->msg_ctx) {
173 stream_terminate_connection(srv_conn, "messaging_init() failed");
177 /* call the server specific accept code */
178 stream_socket->ops->accept_connection(srv_conn);
183 called when someone opens a connection to one of our listening ports
185 static void stream_accept_handler(struct event_context *ev, struct fd_event *fde,
186 uint16_t flags, void *private)
188 struct stream_socket *stream_socket = talloc_get_type(private, struct stream_socket);
190 /* ask the process model to create us a process for this new
191 connection. When done, it calls stream_new_connection()
192 with the newly created socket */
193 stream_socket->model_ops->accept_connection(ev, stream_socket->sock,
194 stream_new_connection, stream_socket);
200 setup a listen stream socket
201 if you pass *port == 0, then a port > 1024 is used
203 NTSTATUS stream_setup_socket(struct event_context *event_context,
204 const struct model_ops *model_ops,
205 const struct stream_server_ops *stream_ops,
207 const char *sock_addr,
212 struct stream_socket *stream_socket;
213 struct socket_address *socket_address;
216 stream_socket = talloc_zero(event_context, struct stream_socket);
217 NT_STATUS_HAVE_NO_MEMORY(stream_socket);
219 status = socket_create(family, SOCKET_TYPE_STREAM, &stream_socket->sock, 0);
220 NT_STATUS_NOT_OK_RETURN(status);
222 talloc_steal(stream_socket, stream_socket->sock);
224 /* ready to listen */
225 status = socket_set_option(stream_socket->sock, "SO_KEEPALIVE", NULL);
226 NT_STATUS_NOT_OK_RETURN(status);
228 status = socket_set_option(stream_socket->sock, lp_socket_options(), NULL);
229 NT_STATUS_NOT_OK_RETURN(status);
231 /* TODO: set socket ACL's here when they're implemented */
234 for (i=SERVER_TCP_LOW_PORT;i<= SERVER_TCP_HIGH_PORT;i++) {
235 socket_address = socket_address_from_strings(stream_socket,
236 stream_socket->sock->backend_name,
238 NT_STATUS_HAVE_NO_MEMORY(socket_address);
239 status = socket_listen(stream_socket->sock, socket_address,
240 SERVER_LISTEN_BACKLOG, 0);
241 talloc_free(socket_address);
242 if (NT_STATUS_IS_OK(status)) {
248 socket_address = socket_address_from_strings(stream_socket,
249 stream_socket->sock->backend_name,
251 NT_STATUS_HAVE_NO_MEMORY(socket_address);
252 status = socket_listen(stream_socket->sock, socket_address, SERVER_LISTEN_BACKLOG, 0);
253 talloc_free(socket_address);
256 if (!NT_STATUS_IS_OK(status)) {
257 DEBUG(0,("Failed to listen on %s:%u - %s\n",
258 sock_addr, *port, nt_errstr(status)));
259 talloc_free(stream_socket);
263 event_add_fd(event_context, stream_socket->sock,
264 socket_get_fd(stream_socket->sock),
265 EVENT_FD_READ, stream_accept_handler, stream_socket);
267 stream_socket->private = talloc_reference(stream_socket, private);
268 stream_socket->ops = stream_ops;
269 stream_socket->event_ctx = event_context;
270 stream_socket->model_ops = model_ops;