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-rw-r--r--source4/smbd/service_stream.c215
-rw-r--r--source4/smbd/service_stream.h57
2 files changed, 272 insertions, 0 deletions
diff --git a/source4/smbd/service_stream.c b/source4/smbd/service_stream.c
new file mode 100644
index 0000000000..72a6703995
--- /dev/null
+++ b/source4/smbd/service_stream.c
@@ -0,0 +1,215 @@
+/*
+ Unix SMB/CIFS implementation.
+
+ hepler functions for stream based servers
+
+ Copyright (C) Andrew Tridgell 2003-2005
+ Copyright (C) Stefan (metze) Metzmacher 2004
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+#include "process_model.h"
+#include "events.h"
+#include "smbd/service_stream.h"
+
+/* the range of ports to try for dcerpc over tcp endpoints */
+#define SERVER_TCP_LOW_PORT 1024
+#define SERVER_TCP_HIGH_PORT 1300
+
+/* size of listen() backlog in smbd */
+#define SERVER_LISTEN_BACKLOG 10
+
+
+/*
+ private structure for a single listening stream socket
+*/
+struct stream_socket {
+ const struct stream_server_ops *ops;
+ struct event_context *event_ctx;
+ const struct model_ops *model_ops;
+ struct socket_context *sock;
+ void *private;
+};
+
+
+/*
+ close the socket and shutdown a stream_connection
+*/
+void stream_terminate_connection(struct stream_connection *srv_conn, const char *reason)
+{
+ struct event_ctx *event_ctx = srv_conn->event.ctx;
+ const struct model_ops *model_ops = srv_conn->model_ops;
+ talloc_free(srv_conn);
+ model_ops->terminate_connection(event_ctx, reason);
+}
+
+/*
+ the select loop has indicated that a stream is ready for IO
+*/
+static void stream_io_handler(struct event_context *ev, struct fd_event *fde,
+ struct timeval t, uint16_t flags)
+{
+ struct stream_connection *conn = talloc_get_type(fde->private,
+ struct stream_connection);
+ if (flags & EVENT_FD_WRITE) {
+ conn->ops->send_handler(conn, t, flags);
+ return;
+ }
+
+ if (flags & EVENT_FD_READ) {
+ conn->ops->recv_handler(conn, t, flags);
+ }
+}
+
+
+/*
+ called when a new socket connection has been established. This is called in the process
+ context of the new process (if appropriate)
+*/
+static void stream_new_connection(struct event_context *ev,
+ struct socket_context *sock,
+ uint32_t server_id, void *private)
+{
+ struct stream_socket *stream_socket = talloc_get_type(private, struct stream_socket);
+ struct fd_event fde;
+ struct stream_connection *srv_conn;
+
+ srv_conn = talloc_zero(ev, struct stream_connection);
+ if (!srv_conn) {
+ DEBUG(0,("talloc(mem_ctx, struct stream_connection) failed\n"));
+ return;
+ }
+
+ talloc_steal(srv_conn, sock);
+
+ fde.private = srv_conn;
+ fde.fd = socket_get_fd(sock);
+ fde.flags = EVENT_FD_READ;
+ fde.handler = stream_io_handler;
+
+ srv_conn->private = stream_socket->private;
+ srv_conn->model_ops = stream_socket->model_ops;
+ srv_conn->event.ctx = ev;
+ srv_conn->event.fde = &fde;
+ srv_conn->socket = sock;
+ srv_conn->server_id = server_id;
+ srv_conn->ops = stream_socket->ops;
+ srv_conn->event.fde = event_add_fd(ev, &fde, srv_conn);
+
+ if (!socket_check_access(sock, "smbd", lp_hostsallow(-1), lp_hostsdeny(-1))) {
+ stream_terminate_connection(srv_conn, "denied by access rules");
+ return;
+ }
+
+ /* setup to receive internal messages on this connection */
+ srv_conn->msg_ctx = messaging_init(srv_conn, srv_conn->server_id, ev);
+ if (!srv_conn->msg_ctx) {
+ stream_terminate_connection(srv_conn, "messaging_init() failed");
+ return;
+ }
+
+ /* call the server specific accept code */
+ stream_socket->ops->accept_connection(srv_conn);
+}
+
+
+/*
+ called when someone opens a connection to one of our listening ports
+*/
+static void stream_accept_handler(struct event_context *ev, struct fd_event *fde,
+ struct timeval t, uint16_t flags)
+{
+ struct stream_socket *stream_socket = talloc_get_type(fde->private, struct stream_socket);
+
+ /* ask the process model to create us a process for this new
+ connection. When done, it calls stream_new_connection()
+ with the newly created socket */
+ stream_socket->model_ops->accept_connection(ev, stream_socket->sock,
+ stream_new_connection, stream_socket);
+}
+
+
+
+/*
+ setup a listen stream socket
+ if you pass *port == 0, then a port > 1024 is used
+ */
+NTSTATUS stream_setup_socket(struct event_context *event_context,
+ const struct model_ops *model_ops,
+ const struct stream_server_ops *stream_ops,
+ const char *family,
+ const char *sock_addr,
+ uint16_t *port,
+ void *private)
+{
+ NTSTATUS status;
+ struct stream_socket *stream_socket;
+ struct fd_event fde;
+ int i;
+
+ stream_socket = talloc_zero(event_context, struct stream_socket);
+ NT_STATUS_HAVE_NO_MEMORY(stream_socket);
+
+ status = socket_create(family, SOCKET_TYPE_STREAM, &stream_socket->sock, 0);
+ NT_STATUS_NOT_OK_RETURN(status);
+
+ talloc_steal(stream_socket, stream_socket->sock);
+
+ /* ready to listen */
+ status = socket_set_option(stream_socket->sock, "SO_KEEPALIVE SO_REUSEADDR=1", NULL);
+ NT_STATUS_NOT_OK_RETURN(status);
+
+ status = socket_set_option(stream_socket->sock, lp_socket_options(), NULL);
+ NT_STATUS_NOT_OK_RETURN(status);
+
+ /* TODO: set socket ACL's here when they're implemented */
+
+ if (*port == 0) {
+ for (i=SERVER_TCP_LOW_PORT;i<= SERVER_TCP_HIGH_PORT;i++) {
+ status = socket_listen(stream_socket->sock, sock_addr, i,
+ SERVER_LISTEN_BACKLOG, 0);
+ if (NT_STATUS_IS_OK(status)) {
+ *port = i;
+ break;
+ }
+ }
+ } else {
+ status = socket_listen(stream_socket->sock, sock_addr, *port, SERVER_LISTEN_BACKLOG, 0);
+ }
+
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(0,("Failed to listen on %s:%u - %s\n",
+ sock_addr, *port, nt_errstr(status)));
+ talloc_free(stream_socket);
+ return status;
+ }
+
+ /* we are only interested in read events on the listen socket */
+ fde.fd = socket_get_fd(stream_socket->sock);
+ fde.flags = EVENT_FD_READ;
+ fde.private = stream_socket;
+ fde.handler = stream_accept_handler;
+
+ event_add_fd(event_context, &fde, stream_socket->sock);
+
+ stream_socket->private = talloc_reference(stream_socket, private);
+ stream_socket->ops = stream_ops;
+ stream_socket->event_ctx = event_context;
+ stream_socket->model_ops = model_ops;
+
+ return NT_STATUS_OK;
+}
diff --git a/source4/smbd/service_stream.h b/source4/smbd/service_stream.h
new file mode 100644
index 0000000000..b9d4d4cc77
--- /dev/null
+++ b/source4/smbd/service_stream.h
@@ -0,0 +1,57 @@
+/*
+ Unix SMB/CIFS implementation.
+
+ structures specific to stream servers
+
+ Copyright (C) Stefan (metze) Metzmacher 2004
+ Copyright (C) Andrew Tridgell 2005
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+/* modules can use the following to determine if the interface has changed
+ * please increment the version number after each interface change
+ * with a comment and maybe update struct process_model_critical_sizes.
+ */
+/* version 1 - initial version - metze */
+#define SERVER_SERVICE_VERSION 1
+
+/*
+ top level context for an established stream connection
+*/
+struct stream_connection {
+ const struct stream_server_ops *ops;
+ const struct model_ops *model_ops;
+ uint32_t server_id;
+ void *private;
+
+ struct {
+ struct event_context *ctx;
+ struct fd_event *fde;
+ } event;
+
+ struct socket_context *socket;
+ struct messaging_context *msg_ctx;
+};
+
+
+/* operations passed to the service_stream code */
+struct stream_server_ops {
+ /* the name of the server_service */
+ const char *name;
+ void (*accept_connection)(struct stream_connection *);
+ void (*recv_handler)(struct stream_connection *, struct timeval, uint16_t);
+ void (*send_handler)(struct stream_connection *, struct timeval, uint16_t);
+};
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