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Unix SMB/CIFS implementation.
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process incoming packets - main loop
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Copyright (C) Andrew Tridgell 2004-2005
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Copyright (C) Stefan Metzmacher 2004-2005
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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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#include "smbd/service_task.h"
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#include "smbd/service_stream.h"
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#include "smbd/service.h"
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#include "smb_server/smb_server.h"
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#include "smb_server/service_smb_proto.h"
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#include "lib/messaging/irpc.h"
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#include "lib/stream/packet.h"
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#include "libcli/smb2/smb2.h"
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#include "smb_server/smb2/smb2_server.h"
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#include "system/network.h"
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#include "lib/socket/netif.h"
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#include "param/share.h"
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#include "dsdb/samdb/samdb.h"
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#include "param/param.h"
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static NTSTATUS smbsrv_recv_generic_request(void *private_data, DATA_BLOB blob)
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struct smbsrv_connection *smb_conn = talloc_get_type(private_data, struct smbsrv_connection);
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uint32_t protocol_version;
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/* see if its a special NBT packet */
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if (CVAL(blob.data,0) != 0) {
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status = smbsrv_init_smb_connection(smb_conn, smb_conn->lp_ctx);
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NT_STATUS_NOT_OK_RETURN(status);
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packet_set_callback(smb_conn->packet, smbsrv_recv_smb_request);
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return smbsrv_recv_smb_request(smb_conn, blob);
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if (blob.length < (NBT_HDR_SIZE + MIN_SMB_SIZE)) {
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DEBUG(2,("Invalid SMB packet length count %ld\n", (long)blob.length));
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smbsrv_terminate_connection(smb_conn, "Invalid SMB packet");
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protocol_version = IVAL(blob.data, NBT_HDR_SIZE);
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switch (protocol_version) {
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status = smbsrv_init_smb_connection(smb_conn, smb_conn->lp_ctx);
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NT_STATUS_NOT_OK_RETURN(status);
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packet_set_callback(smb_conn->packet, smbsrv_recv_smb_request);
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return smbsrv_recv_smb_request(smb_conn, blob);
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if (lp_srv_maxprotocol(smb_conn->lp_ctx) < PROTOCOL_SMB2) break;
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status = smbsrv_init_smb2_connection(smb_conn);
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NT_STATUS_NOT_OK_RETURN(status);
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packet_set_callback(smb_conn->packet, smbsrv_recv_smb2_request);
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return smbsrv_recv_smb2_request(smb_conn, blob);
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DEBUG(2,("Invalid SMB packet: protocol prefix: 0x%08X\n", protocol_version));
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smbsrv_terminate_connection(smb_conn, "NON-SMB packet");
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close the socket and shutdown a server_context
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void smbsrv_terminate_connection(struct smbsrv_connection *smb_conn, const char *reason)
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stream_terminate_connection(smb_conn->connection, reason);
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called when a SMB socket becomes readable
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static void smbsrv_recv(struct stream_connection *conn, uint16_t flags)
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struct smbsrv_connection *smb_conn = talloc_get_type(conn->private_data,
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struct smbsrv_connection);
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DEBUG(10,("smbsrv_recv\n"));
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packet_recv(smb_conn->packet);
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called when a SMB socket becomes writable
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static void smbsrv_send(struct stream_connection *conn, uint16_t flags)
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struct smbsrv_connection *smb_conn = talloc_get_type(conn->private_data,
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struct smbsrv_connection);
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packet_queue_run(smb_conn->packet);
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handle socket recv errors
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static void smbsrv_recv_error(void *private_data, NTSTATUS status)
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struct smbsrv_connection *smb_conn = talloc_get_type(private_data, struct smbsrv_connection);
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smbsrv_terminate_connection(smb_conn, nt_errstr(status));
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initialise a server_context from a open socket and register a event handler
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for reading from that socket
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static void smbsrv_accept(struct stream_connection *conn)
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struct smbsrv_connection *smb_conn;
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DEBUG(5,("smbsrv_accept\n"));
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smb_conn = talloc_zero(conn, struct smbsrv_connection);
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stream_terminate_connection(conn, "out of memory");
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smb_conn->packet = packet_init(smb_conn);
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if (!smb_conn->packet) {
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smbsrv_terminate_connection(smb_conn, "out of memory");
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packet_set_private(smb_conn->packet, smb_conn);
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packet_set_socket(smb_conn->packet, conn->socket);
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packet_set_callback(smb_conn->packet, smbsrv_recv_generic_request);
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packet_set_full_request(smb_conn->packet, packet_full_request_nbt);
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packet_set_error_handler(smb_conn->packet, smbsrv_recv_error);
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packet_set_event_context(smb_conn->packet, conn->event.ctx);
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packet_set_fde(smb_conn->packet, conn->event.fde);
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packet_set_serialise(smb_conn->packet);
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smb_conn->lp_ctx = conn->lp_ctx;
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smb_conn->connection = conn;
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conn->private_data = smb_conn;
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smb_conn->statistics.connect_time = timeval_current();
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smbsrv_management_init(smb_conn);
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irpc_add_name(conn->msg_ctx, "smb_server");
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if (!NT_STATUS_IS_OK(share_get_context_by_name(smb_conn, lp_share_backend(smb_conn->lp_ctx),
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smb_conn->connection->event.ctx,
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smb_conn->lp_ctx, &(smb_conn->share_context)))) {
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smbsrv_terminate_connection(smb_conn, "share_init failed!");
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static const struct stream_server_ops smb_stream_ops = {
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.accept_connection = smbsrv_accept,
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.recv_handler = smbsrv_recv,
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.send_handler = smbsrv_send,
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setup a listening socket on all the SMB ports for a particular address
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_PUBLIC_ NTSTATUS smbsrv_add_socket(struct tevent_context *event_context,
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struct loadparm_context *lp_ctx,
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const struct model_ops *model_ops,
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const char **ports = lp_smb_ports(lp_ctx);
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for (i=0;ports[i];i++) {
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uint16_t port = atoi(ports[i]);
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if (port == 0) continue;
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status = stream_setup_socket(event_context, lp_ctx,
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model_ops, &smb_stream_ops,
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"ipv4", address, &port,
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lp_socket_options(lp_ctx),
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NT_STATUS_NOT_OK_RETURN(status);
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pre-open some of our ldb databases, to prevent an explosion of memory usage
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static void smbsrv_preopen_ldb(struct task_server *task)
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/* yes, this looks strange. It is a hack to preload the
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schema. I'd like to share most of the ldb context with the
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child too. That will come later */
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talloc_free(samdb_connect(task, task->event_ctx, task->lp_ctx, NULL));
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open the smb server sockets
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static void smbsrv_task_init(struct task_server *task)
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task_server_set_title(task, "task[smbsrv]");
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if (lp_interfaces(task->lp_ctx) && lp_bind_interfaces_only(task->lp_ctx)) {
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struct interface *ifaces;
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load_interfaces(task, lp_interfaces(task->lp_ctx), &ifaces);
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num_interfaces = iface_count(ifaces);
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/* We have been given an interfaces line, and been
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told to only bind to those interfaces. Create a
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socket per interface and bind to only these.
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for(i = 0; i < num_interfaces; i++) {
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const char *address = iface_n_ip(ifaces, i);
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status = smbsrv_add_socket(task->event_ctx, task->lp_ctx, task->model_ops, address);
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if (!NT_STATUS_IS_OK(status)) goto failed;
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/* Just bind to lp_socket_address() (usually 0.0.0.0) */
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status = smbsrv_add_socket(task->event_ctx, task->lp_ctx, task->model_ops,
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lp_socket_address(task->lp_ctx));
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if (!NT_STATUS_IS_OK(status)) goto failed;
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smbsrv_preopen_ldb(task);
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task_server_terminate(task, "Failed to startup smb server task");
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/* called at smbd startup - register ourselves as a server service */
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NTSTATUS server_service_smb_init(void)
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return register_server_service("smb", smbsrv_task_init);