mirror of
https://github.com/samba-team/samba.git
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0479a2f1cb
There are still a few tidyups of old FSF addresses to come (in both s3
and s4). More commits soon.
(This used to be commit fcf38a38ac
)
314 lines
9.2 KiB
C
314 lines
9.2 KiB
C
/*
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Unix SMB/CIFS implementation.
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helper functions for stream based servers
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Copyright (C) Andrew Tridgell 2003-2005
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Copyright (C) Stefan (metze) Metzmacher 2004
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "process_model.h"
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#include "lib/events/events.h"
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#include "lib/socket/socket.h"
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#include "smbd/service.h"
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#include "smbd/service_stream.h"
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#include "lib/messaging/irpc.h"
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#include "cluster/cluster.h"
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/* the range of ports to try for dcerpc over tcp endpoints */
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#define SERVER_TCP_LOW_PORT 1024
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#define SERVER_TCP_HIGH_PORT 1300
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/* size of listen() backlog in smbd */
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#define SERVER_LISTEN_BACKLOG 10
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/*
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private structure for a single listening stream socket
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*/
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struct stream_socket {
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const struct stream_server_ops *ops;
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struct event_context *event_ctx;
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const struct model_ops *model_ops;
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struct socket_context *sock;
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void *private;
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};
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/*
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close the socket and shutdown a stream_connection
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*/
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void stream_terminate_connection(struct stream_connection *srv_conn, const char *reason)
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{
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struct event_context *event_ctx = srv_conn->event.ctx;
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const struct model_ops *model_ops = srv_conn->model_ops;
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if (!reason) reason = "unknown reason";
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srv_conn->terminate = reason;
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if (srv_conn->processing) {
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/*
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* if we're currently inside the stream_io_handler(),
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* defer the termination to the end of stream_io_hendler()
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*
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* and we don't want to read or write to the connection...
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*/
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event_set_fd_flags(srv_conn->event.fde, 0);
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return;
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}
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talloc_free(srv_conn->event.fde);
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srv_conn->event.fde = NULL;
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talloc_free(srv_conn);
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model_ops->terminate(event_ctx, reason);
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}
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/*
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the select loop has indicated that a stream is ready for IO
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*/
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static void stream_io_handler(struct stream_connection *conn, uint16_t flags)
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{
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conn->processing = True;
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if (flags & EVENT_FD_WRITE) {
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conn->ops->send_handler(conn, flags);
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} else if (flags & EVENT_FD_READ) {
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conn->ops->recv_handler(conn, flags);
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}
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conn->processing = False;
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if (conn->terminate) {
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stream_terminate_connection(conn, conn->terminate);
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}
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}
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static void stream_io_handler_fde(struct event_context *ev, struct fd_event *fde,
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uint16_t flags, void *private)
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{
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struct stream_connection *conn = talloc_get_type(private,
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struct stream_connection);
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stream_io_handler(conn, flags);
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}
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void stream_io_handler_callback(void *private, uint16_t flags)
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{
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struct stream_connection *conn = talloc_get_type(private,
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struct stream_connection);
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stream_io_handler(conn, flags);
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}
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/*
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this creates a stream_connection from an already existing connection,
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used for protocols, where a client connection needs to switched into
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a server connection
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*/
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NTSTATUS stream_new_connection_merge(struct event_context *ev,
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const struct model_ops *model_ops,
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struct socket_context *sock,
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const struct stream_server_ops *stream_ops,
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struct messaging_context *msg_ctx,
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void *private_data,
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struct stream_connection **_srv_conn)
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{
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struct stream_connection *srv_conn;
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srv_conn = talloc_zero(ev, struct stream_connection);
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NT_STATUS_HAVE_NO_MEMORY(srv_conn);
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talloc_steal(srv_conn, sock);
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srv_conn->private = private_data;
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srv_conn->model_ops = model_ops;
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srv_conn->socket = sock;
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srv_conn->server_id = cluster_id(0);
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srv_conn->ops = stream_ops;
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srv_conn->msg_ctx = msg_ctx;
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srv_conn->event.ctx = ev;
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srv_conn->event.fde = event_add_fd(ev, srv_conn, socket_get_fd(sock),
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EVENT_FD_READ,
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stream_io_handler_fde, srv_conn);
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*_srv_conn = srv_conn;
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return NT_STATUS_OK;
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}
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/*
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called when a new socket connection has been established. This is called in the process
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context of the new process (if appropriate)
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*/
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static void stream_new_connection(struct event_context *ev,
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struct socket_context *sock,
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struct server_id server_id, void *private)
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{
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struct stream_socket *stream_socket = talloc_get_type(private, struct stream_socket);
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struct stream_connection *srv_conn;
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struct socket_address *c, *s;
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srv_conn = talloc_zero(ev, struct stream_connection);
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if (!srv_conn) {
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DEBUG(0,("talloc(mem_ctx, struct stream_connection) failed\n"));
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return;
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}
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talloc_steal(srv_conn, sock);
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srv_conn->private = stream_socket->private;
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srv_conn->model_ops = stream_socket->model_ops;
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srv_conn->socket = sock;
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srv_conn->server_id = server_id;
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srv_conn->ops = stream_socket->ops;
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srv_conn->event.ctx = ev;
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srv_conn->event.fde = event_add_fd(ev, srv_conn, socket_get_fd(sock),
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EVENT_FD_READ,
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stream_io_handler_fde, srv_conn);
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if (!socket_check_access(sock, "smbd", lp_hostsallow(-1), lp_hostsdeny(-1))) {
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stream_terminate_connection(srv_conn, "denied by access rules");
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return;
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}
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/* setup to receive internal messages on this connection */
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srv_conn->msg_ctx = messaging_init(srv_conn, srv_conn->server_id, ev);
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if (!srv_conn->msg_ctx) {
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stream_terminate_connection(srv_conn, "messaging_init() failed");
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return;
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}
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c = socket_get_peer_addr(sock, ev);
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s = socket_get_my_addr(sock, ev);
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if (s && c) {
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const char *title;
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title = talloc_asprintf(s, "conn[%s] c[%s:%u] s[%s:%u] server_id[%s]",
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stream_socket->ops->name,
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c->addr, c->port, s->addr, s->port,
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cluster_id_string(s, server_id));
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if (title) {
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stream_connection_set_title(srv_conn, title);
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}
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}
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talloc_free(c);
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talloc_free(s);
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/* call the server specific accept code */
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stream_socket->ops->accept_connection(srv_conn);
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}
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/*
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called when someone opens a connection to one of our listening ports
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*/
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static void stream_accept_handler(struct event_context *ev, struct fd_event *fde,
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uint16_t flags, void *private)
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{
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struct stream_socket *stream_socket = talloc_get_type(private, struct stream_socket);
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/* ask the process model to create us a process for this new
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connection. When done, it calls stream_new_connection()
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with the newly created socket */
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stream_socket->model_ops->accept_connection(ev, stream_socket->sock,
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stream_new_connection, stream_socket);
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}
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/*
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setup a listen stream socket
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if you pass *port == 0, then a port > 1024 is used
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*/
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NTSTATUS stream_setup_socket(struct event_context *event_context,
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const struct model_ops *model_ops,
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const struct stream_server_ops *stream_ops,
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const char *family,
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const char *sock_addr,
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uint16_t *port,
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void *private)
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{
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NTSTATUS status;
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struct stream_socket *stream_socket;
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struct socket_address *socket_address;
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int i;
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stream_socket = talloc_zero(event_context, struct stream_socket);
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NT_STATUS_HAVE_NO_MEMORY(stream_socket);
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status = socket_create(family, SOCKET_TYPE_STREAM, &stream_socket->sock, 0);
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NT_STATUS_NOT_OK_RETURN(status);
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talloc_steal(stream_socket, stream_socket->sock);
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/* ready to listen */
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status = socket_set_option(stream_socket->sock, "SO_KEEPALIVE", NULL);
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NT_STATUS_NOT_OK_RETURN(status);
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status = socket_set_option(stream_socket->sock, lp_socket_options(), NULL);
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NT_STATUS_NOT_OK_RETURN(status);
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/* TODO: set socket ACL's here when they're implemented */
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if (*port == 0) {
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for (i=SERVER_TCP_LOW_PORT;i<= SERVER_TCP_HIGH_PORT;i++) {
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socket_address = socket_address_from_strings(stream_socket,
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stream_socket->sock->backend_name,
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sock_addr, i);
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NT_STATUS_HAVE_NO_MEMORY(socket_address);
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status = socket_listen(stream_socket->sock, socket_address,
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SERVER_LISTEN_BACKLOG, 0);
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talloc_free(socket_address);
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if (NT_STATUS_IS_OK(status)) {
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*port = i;
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break;
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}
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}
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} else {
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socket_address = socket_address_from_strings(stream_socket,
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stream_socket->sock->backend_name,
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sock_addr, *port);
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NT_STATUS_HAVE_NO_MEMORY(socket_address);
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status = socket_listen(stream_socket->sock, socket_address, SERVER_LISTEN_BACKLOG, 0);
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talloc_free(socket_address);
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}
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(0,("Failed to listen on %s:%u - %s\n",
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sock_addr, *port, nt_errstr(status)));
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talloc_free(stream_socket);
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return status;
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}
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/* we will close the socket using the events system */
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socket_set_flags(stream_socket->sock, SOCKET_FLAG_NOCLOSE);
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event_add_fd(event_context, stream_socket->sock,
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socket_get_fd(stream_socket->sock),
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EVENT_FD_READ|EVENT_FD_AUTOCLOSE,
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stream_accept_handler, stream_socket);
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stream_socket->private = talloc_reference(stream_socket, private);
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stream_socket->ops = stream_ops;
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stream_socket->event_ctx = event_context;
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stream_socket->model_ops = model_ops;
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return NT_STATUS_OK;
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}
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/*
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setup a connection title
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*/
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void stream_connection_set_title(struct stream_connection *conn, const char *title)
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{
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conn->model_ops->set_title(conn->event.ctx, title);
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}
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