diff options
Diffstat (limited to 'source4/wrepl_server')
| -rw-r--r-- | source4/wrepl_server/config.mk | 11 | ||||
| -rw-r--r-- | source4/wrepl_server/wrepl_server.c | 499 |
2 files changed, 510 insertions, 0 deletions
diff --git a/source4/wrepl_server/config.mk b/source4/wrepl_server/config.mk new file mode 100644 index 0000000000..d5c194d2aa --- /dev/null +++ b/source4/wrepl_server/config.mk @@ -0,0 +1,11 @@ +# WREPL server subsystem + +####################### +# Start SUBSYSTEM WREPL_SRV +[SUBSYSTEM::WREPL_SRV] +INIT_OBJ_FILES = \ + wrepl_server/wrepl_server.o +REQUIRED_SUBSYSTEMS = \ + LIBCLI_WREPL WINSDB +# End SUBSYSTEM WREPL_SRV +####################### diff --git a/source4/wrepl_server/wrepl_server.c b/source4/wrepl_server/wrepl_server.c new file mode 100644 index 0000000000..10dc824507 --- /dev/null +++ b/source4/wrepl_server/wrepl_server.c @@ -0,0 +1,499 @@ +/* + 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 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 "dlinklist.h" +#include "lib/events/events.h" +#include "lib/socket/socket.h" +#include "smbd/service_task.h" +#include "smbd/service_stream.h" +#include "lib/messaging/irpc.h" +#include "librpc/gen_ndr/ndr_winsrepl.h" + +struct wreplsrv_service; +struct wreplsrv_in_connection; +struct wreplsrv_out_connection; +struct wreplsrv_partner; +struct wreplsrv_pull_partner_item; +struct wreplsrv_push_partner_item; + +/* + state of an incoming wrepl call +*/ +struct wreplsrv_in_call { + struct wreplsrv_in_connection *wreplconn; + struct wrepl_packet req_packet; + struct wrepl_packet rep_packet; +}; + +/* + state of an incoming wrepl connection +*/ +struct wreplsrv_in_connection { + struct wreplsrv_in_connection *prev,*next; + struct stream_connection *conn; + + /* our global service context */ + struct wreplsrv_service *service; + + /* + * the partner that connects us, + * can be NULL, when we got a connection + * from an unknown address + */ + struct wreplsrv_partner *partner; + + /* + * we need to take care of our own ip address, + * as this is the WINS-Owner ID the peer expect + * from us. + */ + const char *our_ip; + + /* the partial input on the connection */ + DATA_BLOB partial; + size_t partial_read; + + /* + * are we currently processing a request? + * this prevents loops, with half async code + */ + BOOL processing; + + /* the list of outgoing DATA_BLOB's that needs to be send */ + struct data_blob_list_item *send_queue; +}; + +/* + state of an outcoming wrepl connection +*/ +struct wreplsrv_out_connection { + struct wreplsrv_partner *partner; +}; + +/* + state of the whole wrepl service +*/ +struct wreplsrv_service { + /* the whole wrepl service is in one task */ + struct task_server *task; + + /* all incoming connections */ + struct wreplsrv_in_connection *in_connections; + + /* all partners (pull and push) */ + struct wreplsrv_partner *partners; + + /* all pull partners */ + struct wreplsrv_pull_partner *pull_partners; + + /* all push partners */ + struct wreplsrv_push_partner *push_partners; +}; + +static void wreplsrv_terminate_connection(struct wreplsrv_in_connection *wreplconn, const char *reason) +{ + stream_terminate_connection(wreplconn->conn, reason); +} + +static NTSTATUS wreplsrv_in_start_association(struct wreplsrv_in_call *call) +{ + struct wrepl_stop *stop; + + call->rep_packet.opcode = WREPL_OPCODE_BITS; + call->rep_packet.assoc_ctx = 0; + call->rep_packet.mess_type = WREPL_STOP_ASSOCIATION; + stop = &call->rep_packet.message.stop; + stop->reason = 4; + + return NT_STATUS_OK; +} + +static NTSTATUS wreplsrv_in_replication(struct wreplsrv_in_call *call) +{ + struct wrepl_replication *repl_in = &call->req_packet.message.replication; + struct wrepl_stop *stop_out; + + switch (repl_in->command) { + case WREPL_REPL_TABLE_QUERY: + break; + case WREPL_REPL_TABLE_REPLY: + break; + case WREPL_REPL_SEND_REQUEST: + break; + case WREPL_REPL_SEND_REPLY: + break; + case WREPL_REPL_UPDATE: + break; + case WREPL_REPL_INFORM: + break; + } + + call->rep_packet.opcode = WREPL_OPCODE_BITS; + call->rep_packet.assoc_ctx = 0; + call->rep_packet.mess_type = WREPL_STOP_ASSOCIATION; + stop_out = &call->rep_packet.message.stop; + stop_out->reason = 4; + + return NT_STATUS_OK; +} + +static NTSTATUS wreplsrv_in_call(struct wreplsrv_in_call *call) +{ + struct wrepl_stop *stop_out; + + /* TODO: check opcode and assoc_ctx */ + + switch (call->req_packet.mess_type) { + case WREPL_START_ASSOCIATION: + return wreplsrv_in_start_association(call); + + case WREPL_START_ASSOCIATION_REPLY: + /* this is not valid here */ + break; + case WREPL_STOP_ASSOCIATION: + /* this is not valid here */ + break; + + case WREPL_REPLICATION: + return wreplsrv_in_replication(call); + } + + call->rep_packet.opcode = WREPL_OPCODE_BITS; + call->rep_packet.assoc_ctx = 0; + call->rep_packet.mess_type = WREPL_STOP_ASSOCIATION; + call->rep_packet.padding = data_blob(NULL, 0); + stop_out = &call->rep_packet.message.stop; + stop_out->reason = 4; + + return NT_STATUS_OK; +} + +/* + called when we get a new connection +*/ +static void wreplsrv_accept(struct stream_connection *conn) +{ + struct wreplsrv_service *service = talloc_get_type(conn->private, struct wreplsrv_service); + struct wreplsrv_in_connection *wreplconn; + + wreplconn = talloc_zero(conn, struct wreplsrv_in_connection); + if (!wreplconn) { + stream_terminate_connection(conn, "wreplsrv_accept: out of memory"); + return; + } + + wreplconn->conn = conn; + wreplconn->service = service; + wreplconn->our_ip = socket_get_my_addr(conn->socket, wreplconn); + if (!wreplconn->our_ip) { + wreplsrv_terminate_connection(wreplconn, "wreplsrv_accept: out of memory"); + return; + } + + conn->private = wreplconn; + + irpc_add_name(conn->msg_ctx, "wreplsrv_connection"); +} + +/* + receive some data on a WREPL connection +*/ +static void wreplsrv_recv(struct stream_connection *conn, uint16_t flags) +{ + struct wreplsrv_in_connection *wreplconn = talloc_get_type(conn->private, struct wreplsrv_in_connection); + struct wreplsrv_in_call *call; + DATA_BLOB packet_in_blob; + DATA_BLOB packet_out_blob; + struct wrepl_wrap packet_out_wrap; + struct data_blob_list_item *rep; + NTSTATUS status = NT_STATUS_UNSUCCESSFUL; + size_t nread; + + /* avoid recursion, because of half async code */ + if (wreplconn->processing) { + EVENT_FD_NOT_READABLE(conn->event.fde); + return; + } + + if (wreplconn->partial.length == 0) { + wreplconn->partial = data_blob_talloc(wreplconn, NULL, 4); + if (wreplconn->partial.data == NULL) { + status = NT_STATUS_NO_MEMORY; + goto failed; + } + wreplconn->partial_read = 0; + } + + /* read in the packet length */ + if (wreplconn->partial_read < 4) { + uint32_t packet_length; + + status = socket_recv(conn->socket, + wreplconn->partial.data + wreplconn->partial_read, + 4 - wreplconn->partial_read, + &nread, 0); + if (NT_STATUS_IS_ERR(status)) goto failed; + if (!NT_STATUS_IS_OK(status)) return; + + wreplconn->partial_read += nread; + if (wreplconn->partial_read != 4) return; + + packet_length = RIVAL(wreplconn->partial.data, 0) + 4; + + wreplconn->partial.data = talloc_realloc(wreplconn, wreplconn->partial.data, + uint8_t, packet_length); + if (wreplconn->partial.data == NULL) { + status = NT_STATUS_NO_MEMORY; + goto failed; + } + wreplconn->partial.length = packet_length; + } + + /* read in the body */ + status = socket_recv(conn->socket, + wreplconn->partial.data + wreplconn->partial_read, + wreplconn->partial.length - wreplconn->partial_read, + &nread, 0); + if (NT_STATUS_IS_ERR(status)) goto failed; + if (!NT_STATUS_IS_OK(status)) return; + + wreplconn->partial_read += nread; + if (wreplconn->partial_read != wreplconn->partial.length) return; + + packet_in_blob.data = wreplconn->partial.data + 4; + packet_in_blob.length = wreplconn->partial.length - 4; + + call = talloc(wreplconn, struct wreplsrv_in_call); + if (!call) { + status = NT_STATUS_NO_MEMORY; + goto failed; + } + call->wreplconn = wreplconn; + + /* we have a full request - parse it */ + status = ndr_pull_struct_blob(&packet_in_blob, + call, &call->req_packet, + (ndr_pull_flags_fn_t)ndr_pull_wrepl_packet); + if (!NT_STATUS_IS_OK(status)) { + DEBUG(2,("Failed to parse incoming WINS-Replication packet - %s\n", + nt_errstr(status))); + DEBUG(10,("packet length %u\n", wreplconn->partial.length)); + NDR_PRINT_DEBUG(wrepl_packet, &call->req_packet); + goto failed; + } + + /* + * we have parsed the request, so we can reset the wreplconn->partial_read, + * maybe we could also free wreplconn->partial, but for now we keep it, + * and overwrite it the next time + */ + wreplconn->partial_read = 0; + + if (DEBUGLVL(10)) { + DEBUG(10,("Received WINS-Replication packet of length %u\n", wreplconn->partial.length)); + NDR_PRINT_DEBUG(wrepl_packet, &call->req_packet); + } + + /* actually process the request */ + wreplconn->processing = True; + status = wreplsrv_in_call(call); + wreplconn->processing = False; + if (!NT_STATUS_IS_OK(status)) goto failed; + + /* and now encode the reply */ + packet_out_wrap.packet = call->rep_packet; + status = ndr_push_struct_blob(&packet_out_blob, call, &packet_out_wrap, + (ndr_push_flags_fn_t)ndr_push_wrepl_wrap); + if (!NT_STATUS_IS_OK(status)) goto failed; + + if (DEBUGLVL(10)) { + DEBUG(10,("Sending WINS-Replication packet of length %d\n", (int)packet_out_blob.length)); + NDR_PRINT_DEBUG(wrepl_packet, &call->rep_packet); + } + + rep = talloc(wreplconn, struct data_blob_list_item); + if (!rep) { + status = NT_STATUS_NO_MEMORY; + goto failed; + } + + rep->blob = packet_out_blob; + talloc_steal(rep, packet_out_blob.data); + /* we don't need the call anymore */ + talloc_free(call); + + if (!wreplconn->send_queue) { + EVENT_FD_WRITEABLE(conn->event.fde); + } + DLIST_ADD_END(wreplconn->send_queue, rep, struct data_blob_list_item *); + + EVENT_FD_READABLE(conn->event.fde); + return; + +failed: + wreplsrv_terminate_connection(wreplconn, nt_errstr(status)); +} + +/* + called when we can write to a connection +*/ +static void wreplsrv_send(struct stream_connection *conn, uint16_t flags) +{ + struct wreplsrv_in_connection *wreplconn = talloc_get_type(conn->private, struct wreplsrv_in_connection); + NTSTATUS status; + + while (wreplconn->send_queue) { + struct data_blob_list_item *rep = wreplconn->send_queue; + size_t sendlen; + + status = socket_send(conn->socket, &rep->blob, &sendlen, 0); + if (NT_STATUS_IS_ERR(status)) goto failed; + if (!NT_STATUS_IS_OK(status)) return; + + rep->blob.length -= sendlen; + rep->blob.data += sendlen; + + if (rep->blob.length == 0) { + DLIST_REMOVE(wreplconn->send_queue, rep); + talloc_free(rep); + } + } + + EVENT_FD_NOT_WRITEABLE(conn->event.fde); + return; + +failed: + wreplsrv_terminate_connection(wreplconn, nt_errstr(status)); +} + +static const struct stream_server_ops wreplsrv_stream_ops = { + .name = "wreplsrv", + .accept_connection = wreplsrv_accept, + .recv_handler = wreplsrv_recv, + .send_handler = wreplsrv_send, +}; + +/* + startup the wrepl port 42 server sockets +*/ +static NTSTATUS wreplsrv_setup_sockets(struct wreplsrv_service *service) +{ + 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_byname("single"); + if (!model_ops) { + DEBUG(0,("Can't find 'single' process model_ops")); + return NT_STATUS_INTERNAL_ERROR; + } + + 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++) { + address = iface_n_ip(i); + status = stream_setup_socket(task->event_ctx, model_ops, &wreplsrv_stream_ops, + "ipv4", address, &port, NULL); + 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 = lp_socket_address(); + status = stream_setup_socket(task->event_ctx, model_ops, &wreplsrv_stream_ops, + "ipv4", address, &port, NULL); + 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; +} + +/* + startup the wrepl task +*/ +static void wreplsrv_task_init(struct task_server *task) +{ + NTSTATUS status; + struct wreplsrv_service *service; + + service = talloc_zero(task, struct wreplsrv_service); + if (!service) { + task_server_terminate(task, "wreplsrv_task_init: out of memory"); + return; + } + service->task = task; + task->private = service; + + /* + * TODO: setup up all partners, and open the winsdb + */ + + /* + * setup listen sockets, so we can anwser requests from our partners, + * which pull from us + */ + status = wreplsrv_setup_sockets(service); + if (!NT_STATUS_IS_OK(status)) { + task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_sockets() failed"); + return; + } + + /* + * TODO: setup timed events for each partner we want to pull from + */ + + irpc_add_name(task->msg_ctx, "wrepl_server"); +} + +/* + initialise the WREPL server + */ +static NTSTATUS wreplsrv_init(struct event_context *event_ctx, const struct model_ops *model_ops) +{ + return task_server_startup(event_ctx, model_ops, wreplsrv_task_init); +} + +/* + register ourselves as a available server +*/ +NTSTATUS server_service_wrepl_init(void) +{ + return register_server_service("wrepl", wreplsrv_init); +} |