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/*
Unix SMB/CIFS implementation.
process incoming packets - main loop
Copyright (C) Andrew Tridgell 2004-2005
Copyright (C) Stefan Metzmacher 2004-2005
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.
*/
#include "includes.h"
#include "lib/events/events.h"
#include "system/time.h"
#include "dlinklist.h"
#include "smbd/service_stream.h"
#include "smb_server/smb_server.h"
#include "lib/messaging/irpc.h"
#include "lib/stream/packet.h"
#include "libcli/smb2/smb2.h"
static NTSTATUS smbsrv_recv_generic_request(void *private, DATA_BLOB blob)
{
NTSTATUS status;
struct smbsrv_connection *smb_conn = talloc_get_type(private, struct smbsrv_connection);
uint32_t protocol_version;
/* see if its a special NBT packet */
if (CVAL(blob.data,0) != 0) {
status = smbsrv_init_smb_connection(smb_conn);
NT_STATUS_NOT_OK_RETURN(status);
packet_set_callback(smb_conn->packet, smbsrv_recv_smb_request);
return smbsrv_recv_smb_request(smb_conn, blob);
}
if (blob.length < (NBT_HDR_SIZE + MIN_SMB_SIZE)) {
DEBUG(2,("Invalid SMB packet length count %ld\n", (long)blob.length));
smbsrv_terminate_connection(smb_conn, "Invalid SMB packet");
return NT_STATUS_OK;
}
protocol_version = IVAL(blob.data, NBT_HDR_SIZE);
switch (protocol_version) {
case SMB_MAGIC:
status = smbsrv_init_smb_connection(smb_conn);
NT_STATUS_NOT_OK_RETURN(status);
packet_set_callback(smb_conn->packet, smbsrv_recv_smb_request);
return smbsrv_recv_smb_request(smb_conn, blob);
case SMB2_MAGIC:
if (!lp_parm_bool(-1, "smbsrv", "enable smb2", False)) break;
status = smbsrv_init_smb2_connection(smb_conn);
NT_STATUS_NOT_OK_RETURN(status);
packet_set_callback(smb_conn->packet, smbsrv_recv_smb2_request);
return smbsrv_recv_smb2_request(smb_conn, blob);
}
DEBUG(2,("Invalid SMB packet: protocl prefix: 0x%08X\n", protocol_version));
smbsrv_terminate_connection(smb_conn, "NON-SMB packet");
return NT_STATUS_OK;
}
/*
close the socket and shutdown a server_context
*/
void smbsrv_terminate_connection(struct smbsrv_connection *smb_conn, const char *reason)
{
smb_conn->terminate = reason;
}
/*
called when a SMB socket becomes readable
*/
static void smbsrv_recv(struct stream_connection *conn, uint16_t flags)
{
struct smbsrv_connection *smb_conn = talloc_get_type(conn->private, struct smbsrv_connection);
DEBUG(10,("smbsrv_recv\n"));
packet_recv(smb_conn->packet);
if (smb_conn->terminate) {
talloc_free(conn->event.fde);
conn->event.fde = NULL;
stream_terminate_connection(smb_conn->connection, smb_conn->terminate);
return;
}
/* free up temporary memory */
lp_talloc_free();
}
/*
called when a SMB socket becomes writable
*/
static void smbsrv_send(struct stream_connection *conn, uint16_t flags)
{
struct smbsrv_connection *smb_conn = talloc_get_type(conn->private,
struct smbsrv_connection);
packet_queue_run(smb_conn->packet);
}
/*
handle socket recv errors
*/
static void smbsrv_recv_error(void *private, NTSTATUS status)
{
struct smbsrv_connection *smb_conn = talloc_get_type(private, struct smbsrv_connection);
smbsrv_terminate_connection(smb_conn, nt_errstr(status));
}
/*
initialise a server_context from a open socket and register a event handler
for reading from that socket
*/
static void smbsrv_accept(struct stream_connection *conn)
{
struct smbsrv_connection *smb_conn;
DEBUG(5,("smbsrv_accept\n"));
smb_conn = talloc_zero(conn, struct smbsrv_connection);
if (!smb_conn) return;
smb_conn->packet = packet_init(smb_conn);
if (smb_conn->packet == NULL) {
stream_terminate_connection(conn, "out of memory");
return;
}
packet_set_private(smb_conn->packet, smb_conn);
packet_set_socket(smb_conn->packet, conn->socket);
packet_set_callback(smb_conn->packet, smbsrv_recv_generic_request);
packet_set_full_request(smb_conn->packet, packet_full_request_nbt);
packet_set_error_handler(smb_conn->packet, smbsrv_recv_error);
packet_set_event_context(smb_conn->packet, conn->event.ctx);
packet_set_fde(smb_conn->packet, conn->event.fde);
packet_set_serialise(smb_conn->packet);
smb_conn->connection = conn;
conn->private = smb_conn;
irpc_add_name(conn->msg_ctx, "smb_server");
smbsrv_management_init(smb_conn);
}
static const struct stream_server_ops smb_stream_ops = {
.name = "smb",
.accept_connection = smbsrv_accept,
.recv_handler = smbsrv_recv,
.send_handler = smbsrv_send,
};
/*
setup a listening socket on all the SMB ports for a particular address
*/
static NTSTATUS smb_add_socket(struct event_context *event_context,
const struct model_ops *model_ops,
const char *address)
{
const char **ports = lp_smb_ports();
int i;
NTSTATUS status;
for (i=0;ports[i];i++) {
uint16_t port = atoi(ports[i]);
if (port == 0) continue;
status = stream_setup_socket(event_context, model_ops, &smb_stream_ops,
"ipv4", address, &port, NULL);
NT_STATUS_NOT_OK_RETURN(status);
}
return NT_STATUS_OK;
}
/*
called on startup of the smb server service It's job is to start
listening on all configured SMB server sockets
*/
static NTSTATUS smbsrv_init(struct event_context *event_context, const struct model_ops *model_ops)
{
NTSTATUS status;
if (lp_interfaces() && lp_bind_interfaces_only()) {
int num_interfaces = iface_count();
int i;
/* We have been given an interfaces line, and been
told to only bind to those interfaces. Create a
socket per interface and bind to only these.
*/
for(i = 0; i < num_interfaces; i++) {
const char *address = iface_n_ip(i);
status = smb_add_socket(event_context, model_ops, address);
NT_STATUS_NOT_OK_RETURN(status);
}
} else {
/* Just bind to lp_socket_address() (usually 0.0.0.0) */
status = smb_add_socket(event_context, model_ops, lp_socket_address());
NT_STATUS_NOT_OK_RETURN(status);
}
return NT_STATUS_OK;
}
/* called at smbd startup - register ourselves as a server service */
NTSTATUS server_service_smb_init(void)
{
return register_server_service("smb", smbsrv_init);
}
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