/* Unix SMB/CIFS implementation. WINS Replication server Copyright (C) Stefan Metzmacher 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 3 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, see . */ #include "includes.h" #include "lib/socket/socket.h" #include "lib/stream/packet.h" #include "smbd/service_task.h" #include "smbd/service_stream.h" #include "smbd/service.h" #include "lib/messaging/irpc.h" #include "librpc/gen_ndr/ndr_winsrepl.h" #include "wrepl_server/wrepl_server.h" #include "smbd/process_model.h" #include "system/network.h" #include "lib/socket/netif.h" #include "lib/tsocket/tsocket.h" #include "libcli/util/tstream.h" #include "param/param.h" void wreplsrv_terminate_in_connection(struct wreplsrv_in_connection *wreplconn, const char *reason) { stream_terminate_connection(wreplconn->conn, reason); } /* receive some data on a WREPL connection */ static NTSTATUS wreplsrv_process(struct wreplsrv_in_connection *wrepl_conn, struct wreplsrv_in_call **_call) { struct wrepl_wrap packet_out_wrap; NTSTATUS status; enum ndr_err_code ndr_err; struct wreplsrv_in_call *call = *_call; ndr_err = ndr_pull_struct_blob(&call->in, call, &call->req_packet, (ndr_pull_flags_fn_t)ndr_pull_wrepl_packet); if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) { return ndr_map_error2ntstatus(ndr_err); } if (DEBUGLVL(10)) { DEBUG(10,("Received WINS-Replication packet of length %u\n", (unsigned int) call->in.length + 4)); NDR_PRINT_DEBUG(wrepl_packet, &call->req_packet); } status = wreplsrv_in_call(call); NT_STATUS_IS_ERR_RETURN(status); if (!NT_STATUS_IS_OK(status)) { /* w2k just ignores invalid packets, so we do */ DEBUG(10,("Received WINS-Replication packet was invalid, we just ignore it\n")); TALLOC_FREE(call); *_call = NULL; return NT_STATUS_OK; } /* and now encode the reply */ packet_out_wrap.packet = call->rep_packet; ndr_err = ndr_push_struct_blob(&call->out, call, &packet_out_wrap, (ndr_push_flags_fn_t) ndr_push_wrepl_wrap); if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) { return ndr_map_error2ntstatus(ndr_err); } if (DEBUGLVL(10)) { DEBUG(10,("Sending WINS-Replication packet of length %u\n", (unsigned int) call->out.length)); NDR_PRINT_DEBUG(wrepl_packet, &call->rep_packet); } return NT_STATUS_OK; } static void wreplsrv_call_loop(struct tevent_req *subreq); /* called when we get a new connection */ static void wreplsrv_accept(struct stream_connection *conn) { struct wreplsrv_service *service = talloc_get_type(conn->private_data, struct wreplsrv_service); struct wreplsrv_in_connection *wrepl_conn; struct tsocket_address *peer_addr; char *peer_ip; struct tevent_req *subreq; int rc; wrepl_conn = talloc_zero(conn, struct wreplsrv_in_connection); if (wrepl_conn == NULL) { stream_terminate_connection(conn, "wreplsrv_accept: out of memory"); return; } wrepl_conn->send_queue = tevent_queue_create(conn, "wrepl_accept"); if (wrepl_conn->send_queue == NULL) { stream_terminate_connection(conn, "wrepl_accept: out of memory"); return; } TALLOC_FREE(conn->event.fde); rc = tstream_bsd_existing_socket(wrepl_conn, socket_get_fd(conn->socket), &wrepl_conn->tstream); if (rc < 0) { stream_terminate_connection(conn, "wrepl_accept: out of memory"); return; } socket_set_flags(conn->socket, SOCKET_FLAG_NOCLOSE); wrepl_conn->conn = conn; wrepl_conn->service = service; peer_addr = conn->remote_address; if (!tsocket_address_is_inet(peer_addr, "ipv4")) { DEBUG(0,("wreplsrv_accept: non ipv4 peer addr '%s'\n", tsocket_address_string(peer_addr, wrepl_conn))); wreplsrv_terminate_in_connection(wrepl_conn, "wreplsrv_accept: " "invalid peer IP"); return; } peer_ip = tsocket_address_inet_addr_string(peer_addr, wrepl_conn); if (peer_ip == NULL) { wreplsrv_terminate_in_connection(wrepl_conn, "wreplsrv_accept: " "could not convert peer IP into a string"); return; } wrepl_conn->partner = wreplsrv_find_partner(service, peer_ip); irpc_add_name(conn->msg_ctx, "wreplsrv_connection"); /* * The wrepl pdu's has the length as 4 byte (initial_read_size), * packet_full_request_u32 provides the pdu length then. */ subreq = tstream_read_pdu_blob_send(wrepl_conn, wrepl_conn->conn->event.ctx, wrepl_conn->tstream, 4, /* initial_read_size */ packet_full_request_u32, wrepl_conn); if (subreq == NULL) { wreplsrv_terminate_in_connection(wrepl_conn, "wrepl_accept: " "no memory for tstream_read_pdu_blob_send"); return; } tevent_req_set_callback(subreq, wreplsrv_call_loop, wrepl_conn); } static void wreplsrv_call_writev_done(struct tevent_req *subreq); static void wreplsrv_call_loop(struct tevent_req *subreq) { struct wreplsrv_in_connection *wrepl_conn = tevent_req_callback_data(subreq, struct wreplsrv_in_connection); struct wreplsrv_in_call *call; NTSTATUS status; call = talloc_zero(wrepl_conn, struct wreplsrv_in_call); if (call == NULL) { wreplsrv_terminate_in_connection(wrepl_conn, "wreplsrv_call_loop: " "no memory for wrepl_samba3_call"); return; } call->wreplconn = wrepl_conn; status = tstream_read_pdu_blob_recv(subreq, call, &call->in); TALLOC_FREE(subreq); if (!NT_STATUS_IS_OK(status)) { const char *reason; reason = talloc_asprintf(call, "wreplsrv_call_loop: " "tstream_read_pdu_blob_recv() - %s", nt_errstr(status)); if (!reason) { reason = nt_errstr(status); } wreplsrv_terminate_in_connection(wrepl_conn, reason); return; } DEBUG(10,("Received wrepl packet of length %lu from %s\n", (long) call->in.length, tsocket_address_string(wrepl_conn->conn->remote_address, call))); /* skip length header */ call->in.data += 4; call->in.length -= 4; status = wreplsrv_process(wrepl_conn, &call); if (!NT_STATUS_IS_OK(status)) { const char *reason; reason = talloc_asprintf(call, "wreplsrv_call_loop: " "tstream_read_pdu_blob_recv() - %s", nt_errstr(status)); if (reason == NULL) { reason = nt_errstr(status); } wreplsrv_terminate_in_connection(wrepl_conn, reason); return; } /* We handed over the connection so we're done here */ if (wrepl_conn->tstream == NULL) { return; } /* Invalid WINS-Replication packet, we just ignore it */ if (call == NULL) { goto noreply; } call->out_iov[0].iov_base = (char *) call->out.data; call->out_iov[0].iov_len = call->out.length; subreq = tstream_writev_queue_send(call, wrepl_conn->conn->event.ctx, wrepl_conn->tstream, wrepl_conn->send_queue, call->out_iov, 1); if (subreq == NULL) { wreplsrv_terminate_in_connection(wrepl_conn, "wreplsrv_call_loop: " "no memory for tstream_writev_queue_send"); return; } tevent_req_set_callback(subreq, wreplsrv_call_writev_done, call); noreply: /* * The wrepl pdu's has the length as 4 byte (initial_read_size), * provides the pdu length then. */ subreq = tstream_read_pdu_blob_send(wrepl_conn, wrepl_conn->conn->event.ctx, wrepl_conn->tstream, 4, /* initial_read_size */ packet_full_request_u32, wrepl_conn); if (subreq == NULL) { wreplsrv_terminate_in_connection(wrepl_conn, "wreplsrv_call_loop: " "no memory for tstream_read_pdu_blob_send"); return; } tevent_req_set_callback(subreq, wreplsrv_call_loop, wrepl_conn); } static void wreplsrv_call_writev_done(struct tevent_req *subreq) { struct wreplsrv_in_call *call = tevent_req_callback_data(subreq, struct wreplsrv_in_call); int sys_errno; int rc; rc = tstream_writev_queue_recv(subreq, &sys_errno); TALLOC_FREE(subreq); if (rc == -1) { const char *reason; reason = talloc_asprintf(call, "wreplsrv_call_writev_done: " "tstream_writev_queue_recv() - %d:%s", sys_errno, strerror(sys_errno)); if (reason == NULL) { reason = "wreplsrv_call_writev_done: " "tstream_writev_queue_recv() failed"; } wreplsrv_terminate_in_connection(call->wreplconn, reason); return; } if (call->terminate_after_send) { wreplsrv_terminate_in_connection(call->wreplconn, "wreplsrv_in_connection: terminate_after_send"); return; } talloc_free(call); } /* called on a tcp recv */ static void wreplsrv_recv(struct stream_connection *conn, uint16_t flags) { struct wreplsrv_in_connection *wrepl_conn = talloc_get_type(conn->private_data, struct wreplsrv_in_connection); /* this should never be triggered! */ DEBUG(0,("Terminating connection - '%s'\n", "wrepl_recv: called")); wreplsrv_terminate_in_connection(wrepl_conn, "wrepl_recv: called"); } /* called when we can write to a connection */ static void wreplsrv_send(struct stream_connection *conn, uint16_t flags) { struct wreplsrv_in_connection *wrepl_conn = talloc_get_type(conn->private_data, struct wreplsrv_in_connection); /* this should never be triggered! */ DEBUG(0,("Terminating connection - '%s'\n", "wrepl_send: called")); wreplsrv_terminate_in_connection(wrepl_conn, "wrepl_send: called"); } static const struct stream_server_ops wreplsrv_stream_ops = { .name = "wreplsrv", .accept_connection = wreplsrv_accept, .recv_handler = wreplsrv_recv, .send_handler = wreplsrv_send, }; /* called when we get a new connection */ NTSTATUS wreplsrv_in_connection_merge(struct wreplsrv_partner *partner, uint32_t peer_assoc_ctx, struct tstream_context **stream, struct wreplsrv_in_connection **_wrepl_in) { struct wreplsrv_service *service = partner->service; struct wreplsrv_in_connection *wrepl_in; const struct model_ops *model_ops; struct stream_connection *conn; struct tevent_req *subreq; NTSTATUS status; /* within the wrepl task we want to be a single process, so ask for the single process model ops and pass these to the stream_setup_socket() call. */ model_ops = process_model_startup("single"); if (!model_ops) { DEBUG(0,("Can't find 'single' process model_ops")); return NT_STATUS_INTERNAL_ERROR; } wrepl_in = talloc_zero(partner, struct wreplsrv_in_connection); NT_STATUS_HAVE_NO_MEMORY(wrepl_in); wrepl_in->service = service; wrepl_in->partner = partner; wrepl_in->tstream = talloc_move(wrepl_in, stream); wrepl_in->assoc_ctx.peer_ctx = peer_assoc_ctx; status = stream_new_connection_merge(service->task->event_ctx, service->task->lp_ctx, model_ops, &wreplsrv_stream_ops, service->task->msg_ctx, wrepl_in, &conn); NT_STATUS_NOT_OK_RETURN(status); /* * make the wreplsrv_in_connection structure a child of the * stream_connection, to match the hierarchy of wreplsrv_accept */ wrepl_in->conn = conn; talloc_steal(conn, wrepl_in); wrepl_in->send_queue = tevent_queue_create(wrepl_in, "wreplsrv_in_connection_merge"); if (wrepl_in->send_queue == NULL) { stream_terminate_connection(conn, "wreplsrv_in_connection_merge: out of memory"); return NT_STATUS_NO_MEMORY; } /* * The wrepl pdu's has the length as 4 byte (initial_read_size), * packet_full_request_u32 provides the pdu length then. */ subreq = tstream_read_pdu_blob_send(wrepl_in, wrepl_in->conn->event.ctx, wrepl_in->tstream, 4, /* initial_read_size */ packet_full_request_u32, wrepl_in); if (subreq == NULL) { wreplsrv_terminate_in_connection(wrepl_in, "wreplsrv_in_connection_merge: " "no memory for tstream_read_pdu_blob_send"); return NT_STATUS_NO_MEMORY; } tevent_req_set_callback(subreq, wreplsrv_call_loop, wrepl_in); *_wrepl_in = wrepl_in; return NT_STATUS_OK; } /* startup the wrepl port 42 server sockets */ NTSTATUS wreplsrv_setup_sockets(struct wreplsrv_service *service, struct loadparm_context *lp_ctx) { NTSTATUS status; struct task_server *task = service->task; const struct model_ops *model_ops; const char *address; uint16_t port = WINS_REPLICATION_PORT; /* within the wrepl task we want to be a single process, so ask for the single process model ops and pass these to the stream_setup_socket() call. */ model_ops = process_model_startup("single"); if (!model_ops) { DEBUG(0,("Can't find 'single' process model_ops")); return NT_STATUS_INTERNAL_ERROR; } if (lpcfg_interfaces(lp_ctx) && lpcfg_bind_interfaces_only(lp_ctx)) { int num_interfaces; int i; struct interface *ifaces; load_interface_list(task, lp_ctx, &ifaces); num_interfaces = iface_list_count(ifaces); /* 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++) { if (!iface_list_n_is_v4(ifaces, i)) { continue; } address = iface_list_n_ip(ifaces, i); status = stream_setup_socket(task, task->event_ctx, task->lp_ctx, model_ops, &wreplsrv_stream_ops, "ipv4", address, &port, lpcfg_socket_options(task->lp_ctx), service); if (!NT_STATUS_IS_OK(status)) { DEBUG(0,("stream_setup_socket(address=%s,port=%u) failed - %s\n", address, port, nt_errstr(status))); return status; } } } else { address = lpcfg_socket_address(lp_ctx); if (strcmp(address, "") == 0) { address = "0.0.0.0"; } status = stream_setup_socket(task, task->event_ctx, task->lp_ctx, model_ops, &wreplsrv_stream_ops, "ipv4", address, &port, lpcfg_socket_options(task->lp_ctx), service); if (!NT_STATUS_IS_OK(status)) { DEBUG(0,("stream_setup_socket(address=%s,port=%u) failed - %s\n", address, port, nt_errstr(status))); return status; } } return NT_STATUS_OK; }